diff --git a/CMakeLists.txt b/CMakeLists.txt index d231aca5..99a74f73 100644 --- a/CMakeLists.txt +++ b/CMakeLists.txt @@ -24,7 +24,7 @@ get_directory_property(IS_SUBPROJECT PARENT_DIRECTORY) # do not inherit include directories from the parent project SET_PROPERTY(DIRECTORY PROPERTY INCLUDE_DIRECTORIES) FOREACH(V WITH_MYSQLCOMPAT WITH_MSI WITH_SIGNCODE WITH_RTC WITH_UNIT_TESTS - WITH_DYNCOL WITH_EXTERNAL_ZLIB WITH_CURL WITH_SQLITE WITH_SSL WITH_ICONV + WITH_DYNCOL WITH_EXTERNAL_ZLIB WITH_EXTERNAL_ZSTD WITH_CURL WITH_SQLITE WITH_SSL WITH_ICONV DEFAULT_CHARSET INSTALL_LAYOUT WITH_TEST_SRCPKG) SET(${V} ${${OPT}${V}}) ENDFOREACH() @@ -63,6 +63,7 @@ ENDIF() ADD_OPTION(WITH_UNIT_TESTS "build test suite" ON) ADD_OPTION(WITH_DYNCOL "Enables support of dynamic columns" ON) ADD_OPTION(WITH_EXTERNAL_ZLIB "Enables use of external zlib" OFF) +ADD_OPTION(WITH_EXTERNAL_ZSTD "Enables use of external zstd" OFF) ADD_OPTION(WITH_CURL "Enables use of curl" ON) ADD_OPTION(WITH_SSL "Enables use of TLS/SSL library" ON) ############### @@ -217,16 +218,27 @@ SET(DEFAULT_CHARSET_HOME "${CMAKE_INSTALL_PREFIX}") INCLUDE(${CC_SOURCE_DIR}/cmake/SearchLibrary.cmake) +IF(WITH_EXTERNAL_ZSTD) + INCLUDE(${CC_SOURCE_DIR}/cmake/zstd.cmake) + IF(NOT ZSTD_FOUND) + MESSAGE(FATAL_ERROR "Zstd not found") + ENDIF() +ELSE() + INCLUDE_DIRECTORIES(${CC_SOURCE_DIR}/external/zstd/lib) + ADD_SUBDIRECTORY(external/zstd) + SET(ZSTD_LIBRARY zstd) +ENDIF() + IF(WITH_EXTERNAL_ZLIB) IF(NOT ZLIB_FOUND) FIND_PACKAGE(ZLIB REQUIRED) - INCLUDE_DIRECTORIES(${ZLIB_INCLUDE_DIR}) - SET(LIBZ ${ZLIB_LIBRARY}) - ELSE() - # ZLIB was already specified by another (parent) project - SET(INTERNAL_ZLIB_LIBRARY ${ZLIB_LIBRARY}) ENDIF() +ELSE() + SET(ZLIB_INCLUDE_DIR "${CC_SOURCE_DIR}/external/zlib") + ADD_SUBDIRECTORY(external/zlib) + SET(ZLIB_LIBRARY zlib) ENDIF() +INCLUDE_DIRECTORIES(${ZLIB_INCLUDE_DIR}) IF(NOT WIN32) INCLUDE(TestBigEndian) @@ -246,9 +258,9 @@ IF(UNIX) SEARCH_LIBRARY(LIBNSL gethostbyname_r "nsl_r;nsl") SEARCH_LIBRARY(LIBSOCKET setsockopt socket) FIND_PACKAGE(Threads) - SET(CMAKE_REQUIRED_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES} ${LIBNSL} ${LIBBIND} ${LIBICONV} ${LIBZ} - ${LIBSOCKET} ${CMAKE_DL_LIBS} ${LIBM} ${LIBPTHREAD}) - SET(SYSTEM_LIBS ${SYSTEM_LIBS} ${LIBNSL} ${LIBBIND} ${LIBICONV} ${LIBZ} + SET(CMAKE_REQUIRED_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES} ${LIBNSL} ${LIBBIND} ${LIBICONV} ${ZLIB_LIBRARY} + ${ZSTD_LIBRARY} } ${LIBSOCKET} ${CMAKE_DL_LIBS} ${LIBM} ${LIBPTHREAD}) + SET(SYSTEM_LIBS ${SYSTEM_LIBS} ${LIBNSL} ${LIBBIND} ${LIBICONV} ${LIBSOCKET} ${CMAKE_DL_LIBS} ${LIBM} ${LIBPTHREAD}) #remove possible dups from required libraries LIST(LENGTH CMAKE_REQUIRED_LIBRARIES rllength) diff --git a/cmake/zstd.cmake b/cmake/zstd.cmake new file mode 100644 index 00000000..71172657 --- /dev/null +++ b/cmake/zstd.cmake @@ -0,0 +1,20 @@ +# +# Copyright (C) 2011 MariaDB Corporation AB +# +# Redistribution and use is allowed according to the terms of the New +# BSD license. +# For details see the COPYING-CMAKE-SCRIPTS file. +# + +find_path(ZSTD_INCLUDE_DIR NAMES zstd.h) +find_library(ZSTD_LIBRARY_RELEASE NAMES zstd) + +include(SelectLibraryConfigurations) +SELECT_LIBRARY_CONFIGURATIONS(ZSTD) + +include(FindPackageHandleStandardArgs) +FIND_PACKAGE_HANDLE_STANDARD_ARGS( + ZSTD DEFAULT_MSG + ZSTD_LIBRARY ZSTD_INCLUDE_DIR +) +mark_as_advanced(ZSTD_FOUND ZSTD_INCLUDE_DIR ZSTD_LIBRARY) diff --git a/external/zlib/CMakeLists.txt b/external/zlib/CMakeLists.txt new file mode 100644 index 00000000..8e51a669 --- /dev/null +++ b/external/zlib/CMakeLists.txt @@ -0,0 +1,5 @@ +INCLUDE_DIRECTORIES(${CC_SOURCE_DIR}/zlib) + +SET(SOURCE_FILES adler32.c compress.c crc32.c deflate.c gzclose.c gzlib.c gzread.c gzwrite.c infback.c inffast.c inflate.c inftrees.c minigzip.c trees.c uncompr.c zutil.c) + +ADD_LIBRARY(zlib STATIC ${SOURCE_FILES}) diff --git a/zlib/ChangeLog b/external/zlib/ChangeLog similarity index 100% rename from zlib/ChangeLog rename to external/zlib/ChangeLog diff --git a/zlib/FAQ b/external/zlib/FAQ similarity index 100% rename from zlib/FAQ rename to external/zlib/FAQ diff --git a/zlib/INDEX b/external/zlib/INDEX similarity index 100% rename from zlib/INDEX rename to external/zlib/INDEX diff --git a/external/zlib/Makefile.in b/external/zlib/Makefile.in new file mode 100644 index 00000000..22d1d794 --- /dev/null +++ b/external/zlib/Makefile.in @@ -0,0 +1,306 @@ +# Makefile for zlib +# Copyright (C) 1995-2013 Jean-loup Gailly, Mark Adler +# For conditions of distribution and use, see copyright notice in zlib.h + +# To compile and test, type: +# ./configure; make test +# Normally configure builds both a static and a shared library. +# If you want to build just a static library, use: ./configure --static + + +# To install /usr/local/lib/libz.* and /usr/local/include/zlib.h, type: +# make install +# To install in $HOME instead of /usr/local, use: +# make install prefix=$HOME + +TGT_ARCH= +CC=cc + +CFLAGS=-O +#CFLAGS=-O -DMAX_WBITS=14 -DMAX_MEM_LEVEL=7 +#CFLAGS=-g -DDEBUG +#CFLAGS=-O3 -Wall -Wwrite-strings -Wpointer-arith -Wconversion \ +# -Wstrict-prototypes -Wmissing-prototypes + +SFLAGS=-O +LDFLAGS= +TEST_LDFLAGS=-L. libz.a +LDSHARED=$(CC) +CPP=$(CC) -E + +STATICLIB=libz.a +SHAREDLIB=libz.so +SHAREDLIBV=libz.so.1.2.8 +SHAREDLIBM=libz.so.1 +LIBS=$(STATICLIB) $(SHAREDLIBV) + +AR=ar +ARFLAGS=rc +RANLIB=ranlib +LDCONFIG=ldconfig +LDSHAREDLIBC=-lc +TAR=tar +SHELL=/bin/sh +EXE= + +prefix = /usr/local +exec_prefix = ${prefix} +libdir = ${exec_prefix}/lib +sharedlibdir = ${libdir} +includedir = ${prefix}/include +mandir = ${prefix}/share/man +man3dir = ${mandir}/man3 +pkgconfigdir = ${libdir}/pkgconfig + +OBJZ = adler32.o adler32_simd.o crc32.o deflate.o infback.o inffast.o inflate.o inftrees.o trees.o zutil.o +OBJG = compress.o uncompr.o gzclose.o gzlib.o gzread.o gzwrite.o + +PIC_OBJZ = adler32.lo adler32_simd.lo crc32.lo deflate.lo infback.lo inffast.lo inflate.lo inftrees.lo trees.lo zutil.lo +PIC_OBJG = compress.lo uncompr.lo gzclose.lo gzlib.lo gzread.lo gzwrite.lo + +ifneq ($(findstring -DINFLATE_CHUNK_SIMD_NEON, $(CFLAGS)),) + OBJZ += inffast_chunk.o + PIC_OBJZ += inffast_chunk.lo +endif + +ifneq ($(findstring -DINFLATE_CHUNK_SIMD_SSE2, $(CFLAGS)),) + OBJZ += inffast_chunk.o + PIC_OBJZ += inffast_chunk.lo +endif + +ifneq ($(findstring -DHAS_PCLMUL, $(CFLAGS)),) + OBJZ += crc32_simd.o + PIC_OBJZ += crc32_simd.lo +endif + +OBJC = $(OBJZ) $(OBJG) +PIC_OBJC = $(PIC_OBJZ) $(PIC_OBJG) + +# to use the asm code: make OBJA=match.o, PIC_OBJA=match.lo +OBJA = +PIC_OBJA = + +OBJS = $(OBJC) $(OBJA) + +PIC_OBJS = $(PIC_OBJC) $(PIC_OBJA) + +all: static shared + +static: example$(EXE) minigzip$(EXE) + +shared: examplesh$(EXE) minigzipsh$(EXE) + +all64: example64$(EXE) minigzip64$(EXE) + +check: test + +test: all teststatic testshared + +teststatic: static + @TMPST=tmpst_$$; \ + if echo hello world | ./minigzip | ./minigzip -d && ./example $$TMPST ; then \ + echo ' *** zlib test OK ***'; \ + else \ + echo ' *** zlib test FAILED ***'; false; \ + fi; \ + rm -f $$TMPST + +testshared: shared + @LD_LIBRARY_PATH=`pwd`:$(LD_LIBRARY_PATH) ; export LD_LIBRARY_PATH; \ + LD_LIBRARYN32_PATH=`pwd`:$(LD_LIBRARYN32_PATH) ; export LD_LIBRARYN32_PATH; \ + DYLD_LIBRARY_PATH=`pwd`:$(DYLD_LIBRARY_PATH) ; export DYLD_LIBRARY_PATH; \ + SHLIB_PATH=`pwd`:$(SHLIB_PATH) ; export SHLIB_PATH; \ + TMPSH=tmpsh_$$; \ + if echo hello world | ./minigzipsh | ./minigzipsh -d && ./examplesh $$TMPSH; then \ + echo ' *** zlib shared test OK ***'; \ + else \ + echo ' *** zlib shared test FAILED ***'; false; \ + fi; \ + rm -f $$TMPSH + +test64: all64 + @TMP64=tmp64_$$; \ + if echo hello world | ./minigzip64 | ./minigzip64 -d && ./example64 $$TMP64; then \ + echo ' *** zlib 64-bit test OK ***'; \ + else \ + echo ' *** zlib 64-bit test FAILED ***'; false; \ + fi; \ + rm -f $$TMP64 + +infcover.o: test/infcover.c zlib.h zconf.h + $(CC) $(CFLAGS) -I. -c -o $@ test/infcover.c + +infcover: infcover.o libz.a + $(CC) $(CFLAGS) -o $@ infcover.o libz.a + +cover: infcover + rm -f *.gcda + ./infcover + gcov inf*.c + +libz.a: $(OBJS) + $(AR) $(ARFLAGS) $@ $(OBJS) + -@ ($(RANLIB) $@ || true) >/dev/null 2>&1 + +match.o: match.S + $(CPP) match.S > _match.s + $(CC) -c _match.s + mv _match.o match.o + rm -f _match.s + +match.lo: match.S + $(CPP) match.S > _match.s + $(CC) -c -fPIC _match.s + mv _match.o match.lo + rm -f _match.s + +example.o: test/example.c zlib.h zconf.h + $(CC) $(CFLAGS) -I. -c -o $@ test/example.c + +minigzip.o: test/minigzip.c zlib.h zconf.h + $(CC) $(CFLAGS) -I. -c -o $@ test/minigzip.c + +example64.o: test/example.c zlib.h zconf.h + $(CC) $(CFLAGS) -I. -D_FILE_OFFSET_BITS=64 -c -o $@ test/example.c + +minigzip64.o: test/minigzip.c zlib.h zconf.h + $(CC) $(CFLAGS) -I. -D_FILE_OFFSET_BITS=64 -c -o $@ test/minigzip.c + +.SUFFIXES: .lo + +.c.lo: + -@mkdir objs 2>/dev/null || test -d objs + $(CC) $(SFLAGS) -DPIC -c -o objs/$*.o $< + -@mv objs/$*.o $@ + +placebo $(SHAREDLIBV): $(PIC_OBJS) libz.a + $(LDSHARED) $(SFLAGS) -o $@ $(PIC_OBJS) $(LDSHAREDLIBC) $(LDFLAGS) + rm -f $(SHAREDLIB) $(SHAREDLIBM) + ln -s $@ $(SHAREDLIB) + ln -s $@ $(SHAREDLIBM) + -@rmdir objs + +example$(EXE): example.o $(STATICLIB) + $(CC) $(CFLAGS) -o $@ example.o $(TEST_LDFLAGS) + +minigzip$(EXE): minigzip.o $(STATICLIB) + $(CC) $(CFLAGS) -o $@ minigzip.o $(TEST_LDFLAGS) + +examplesh$(EXE): example.o $(SHAREDLIBV) + $(CC) $(CFLAGS) -o $@ example.o -L. $(SHAREDLIBV) + +minigzipsh$(EXE): minigzip.o $(SHAREDLIBV) + $(CC) $(CFLAGS) -o $@ minigzip.o -L. $(SHAREDLIBV) + +example64$(EXE): example64.o $(STATICLIB) + $(CC) $(CFLAGS) -o $@ example64.o $(TEST_LDFLAGS) + +minigzip64$(EXE): minigzip64.o $(STATICLIB) + $(CC) $(CFLAGS) -o $@ minigzip64.o $(TEST_LDFLAGS) + +install-libs: $(LIBS) + -@if [ ! -d $(DESTDIR)$(exec_prefix) ]; then mkdir -p $(DESTDIR)$(exec_prefix); fi + -@if [ ! -d $(DESTDIR)$(libdir) ]; then mkdir -p $(DESTDIR)$(libdir); fi + -@if [ ! -d $(DESTDIR)$(sharedlibdir) ]; then mkdir -p $(DESTDIR)$(sharedlibdir); fi + -@if [ ! -d $(DESTDIR)$(man3dir) ]; then mkdir -p $(DESTDIR)$(man3dir); fi + -@if [ ! -d $(DESTDIR)$(pkgconfigdir) ]; then mkdir -p $(DESTDIR)$(pkgconfigdir); fi + cp $(STATICLIB) $(DESTDIR)$(libdir) + chmod 644 $(DESTDIR)$(libdir)/$(STATICLIB) + -@($(RANLIB) $(DESTDIR)$(libdir)/libz.a || true) >/dev/null 2>&1 + -@if test -n "$(SHAREDLIBV)"; then \ + cp $(SHAREDLIBV) $(DESTDIR)$(sharedlibdir); \ + echo "cp $(SHAREDLIBV) $(DESTDIR)$(sharedlibdir)"; \ + chmod 755 $(DESTDIR)$(sharedlibdir)/$(SHAREDLIBV); \ + echo "chmod 755 $(DESTDIR)$(sharedlibdir)/$(SHAREDLIBV)"; \ + rm -f $(DESTDIR)$(sharedlibdir)/$(SHAREDLIB) $(DESTDIR)$(sharedlibdir)/$(SHAREDLIBM); \ + ln -s $(SHAREDLIBV) $(DESTDIR)$(sharedlibdir)/$(SHAREDLIB); \ + ln -s $(SHAREDLIBV) $(DESTDIR)$(sharedlibdir)/$(SHAREDLIBM); \ + ($(LDCONFIG) || true) >/dev/null 2>&1; \ + fi + cp zlib.3 $(DESTDIR)$(man3dir) + chmod 644 $(DESTDIR)$(man3dir)/zlib.3 + cp zlib.pc $(DESTDIR)$(pkgconfigdir) + chmod 644 $(DESTDIR)$(pkgconfigdir)/zlib.pc +# The ranlib in install is needed on NeXTSTEP which checks file times +# ldconfig is for Linux + +install: install-libs + -@if [ ! -d $(DESTDIR)$(includedir) ]; then mkdir -p $(DESTDIR)$(includedir); fi + cp zlib.h zconf.h $(DESTDIR)$(includedir) + chmod 644 $(DESTDIR)$(includedir)/zlib.h $(DESTDIR)$(includedir)/zconf.h + +uninstall: + cd $(DESTDIR)$(includedir) && rm -f zlib.h zconf.h + cd $(DESTDIR)$(libdir) && rm -f libz.a; \ + if test -n "$(SHAREDLIBV)" -a -f $(SHAREDLIBV); then \ + rm -f $(SHAREDLIBV) $(SHAREDLIB) $(SHAREDLIBM); \ + fi + cd $(DESTDIR)$(man3dir) && rm -f zlib.3 + cd $(DESTDIR)$(pkgconfigdir) && rm -f zlib.pc + +docs: zlib.3.pdf + +zlib.3.pdf: zlib.3 + groff -mandoc -f H -T ps zlib.3 | ps2pdf - zlib.3.pdf + +zconf.h.cmakein: zconf.h.in + -@ TEMPFILE=zconfh_$$; \ + echo "/#define ZCONF_H/ a\\\\\n#cmakedefine Z_PREFIX\\\\\n#cmakedefine Z_HAVE_UNISTD_H\n" >> $$TEMPFILE &&\ + sed -f $$TEMPFILE zconf.h.in > zconf.h.cmakein &&\ + touch -r zconf.h.in zconf.h.cmakein &&\ + rm $$TEMPFILE + +zconf: zconf.h.in + cp -p zconf.h.in zconf.h + +mostlyclean: clean +clean: + rm -f *.o *.lo *~ \ + example$(EXE) minigzip$(EXE) examplesh$(EXE) minigzipsh$(EXE) \ + example64$(EXE) minigzip64$(EXE) \ + infcover \ + libz.* foo.gz so_locations \ + _match.s maketree contrib/infback9/*.o + rm -rf objs + rm -f *.gcda *.gcno *.gcov + rm -f contrib/infback9/*.gcda contrib/infback9/*.gcno contrib/infback9/*.gcov + +maintainer-clean: distclean +distclean: clean zconf zconf.h.cmakein docs + rm -f Makefile zlib.pc configure.log + -@rm -f .DS_Store + -@printf 'all:\n\t-@echo "Please use ./configure first. Thank you."\n' > Makefile + -@printf '\ndistclean:\n\tmake -f Makefile.in distclean\n' >> Makefile + -@touch -r Makefile.in Makefile + +tags: + etags *.[ch] + +depend: + makedepend -- $(CFLAGS) -- *.[ch] + +# DO NOT DELETE THIS LINE -- make depend depends on it. + +adler32.o zutil.o: zutil.h zlib.h zconf.h +adler32_simd.o: zlib.h +gzclose.o gzlib.o gzread.o gzwrite.o: zlib.h zconf.h gzguts.h +compress.o example.o minigzip.o uncompr.o: zlib.h zconf.h +crc32.o: zutil.h zlib.h zconf.h crc32.h +deflate.o: deflate.h zutil.h zlib.h zconf.h +infback.o inflate.o: zutil.h zlib.h zconf.h inftrees.h inflate.h inffast.h inffixed.h inffast_chunk.h chunkcopy.h +inffast.o: zutil.h zlib.h zconf.h inftrees.h inflate.h inffast.h +inffast_chunk.o: zutil.h zlib.h zconf.h inftrees.h inflate.h inffast_chunk.h chunkcopy.h +inftrees.o: zutil.h zlib.h zconf.h inftrees.h +trees.o: deflate.h zutil.h zlib.h zconf.h trees.h + +adler32.lo zutil.lo: zutil.h zlib.h zconf.h +adler32_simd.o: zlib.h +gzclose.lo gzlib.lo gzread.lo gzwrite.lo: zlib.h zconf.h gzguts.h +compress.lo example.lo minigzip.lo uncompr.lo: zlib.h zconf.h +crc32.lo: zutil.h zlib.h zconf.h crc32.h +deflate.lo: deflate.h zutil.h zlib.h zconf.h +infback.lo inflate.lo: zutil.h zlib.h zconf.h inftrees.h inflate.h inffast.h inffixed.h inffast_chunk.h chunkcopy.h +inffast.lo: zutil.h zlib.h zconf.h inftrees.h inflate.h inffast.h +inffast_chunk.lo: zutil.h zlib.h zconf.h inftrees.h inflate.h inffast_chunk.h chunkcopy.h +inftrees.lo: zutil.h zlib.h zconf.h inftrees.h +trees.lo: deflate.h zutil.h zlib.h zconf.h trees.h diff --git a/zlib/README b/external/zlib/README similarity index 100% rename from zlib/README rename to external/zlib/README diff --git a/zlib/adler32.c b/external/zlib/adler32.c similarity index 100% rename from zlib/adler32.c rename to external/zlib/adler32.c diff --git a/external/zlib/adler32_simd.c b/external/zlib/adler32_simd.c new file mode 100644 index 00000000..5f8c06d0 --- /dev/null +++ b/external/zlib/adler32_simd.c @@ -0,0 +1,387 @@ +/* adler32_simd.c + * + * (C) 1995-2013 Jean-loup Gailly and Mark Adler + * + * This software is provided 'as-is', without any express or implied + * warranty. In no event will the authors be held liable for any damages + * arising from the use of this software. + * + * Permission is granted to anyone to use this software for any purpose, + * including commercial applications, and to alter it and redistribute it + * freely, subject to the following restrictions: + * + * 1. The origin of this software must not be misrepresented; you must not + * claim that you wrote the original software. If you use this software + * in a product, an acknowledgment in the product documentation would be + * appreciated but is not required. + * 2. Altered source versions must be plainly marked as such, and must not be + * misrepresented as being the original software. + * 3. This notice may not be removed or altered from any source distribution. + * + * Jean-loup Gailly Mark Adler + * jloup@gzip.org madler@alumni.caltech.edu + * + * Copyright 2017 The Chromium Authors. All rights reserved. + * Use of this source code is governed by a BSD-style license that can be + * found in the Chromium source repository LICENSE file. + * + * Per http://en.wikipedia.org/wiki/Adler-32 the adler32 A value (aka s1) is + * the sum of N input data bytes D1 ... DN, + * + * A = A0 + D1 + D2 + ... + DN + * + * where A0 is the initial value. + * + * SSE2 _mm_sad_epu8() can be used for byte sums (see http://bit.ly/2wpUOeD, + * for example) and accumulating the byte sums can use SSE shuffle-adds (see + * the "Integer" section of http://bit.ly/2erPT8t for details). Arm NEON has + * similar instructions. + * + * The adler32 B value (aka s2) sums the A values from each step: + * + * B0 + (A0 + D1) + (A0 + D1 + D2) + ... + (A0 + D1 + D2 + ... + DN) or + * + * B0 + N.A0 + N.D1 + (N-1).D2 + (N-2).D3 + ... + (N-(N-1)).DN + * + * B0 being the initial value. For 32 bytes (ideal for garden-variety SIMD): + * + * B = B0 + 32.A0 + [D1 D2 D3 ... D32] x [32 31 30 ... 1]. + * + * Adjacent blocks of 32 input bytes can be iterated with the expressions to + * compute the adler32 s1 s2 of M >> 32 input bytes [1]. + * + * As M grows, the s1 s2 sums grow. If left unchecked, they would eventually + * overflow the precision of their integer representation (bad). However, s1 + * and s2 also need to be computed modulo the adler BASE value (reduced). If + * at most NMAX bytes are processed before a reduce, s1 s2 _cannot_ overflow + * a uint32_t type (the NMAX constraint) [2]. + * + * [1] the iterative equations for s2 contain constant factors; these can be + * hoisted from the n-blocks do loop of the SIMD code. + * + * [2] zlib adler32_z() uses this fact to implement NMAX-block-based updates + * of the adler s1 s2 of uint32_t type (see adler32.c). + */ + +#include "adler32_simd.h" + +/* Definitions from adler32.c: largest prime smaller than 65536 */ +#define BASE 65521U +/* NMAX is the largest n such that 255n(n+1)/2 + (n+1)(BASE-1) <= 2^32-1 */ +#define NMAX 5552 + +#if defined(ADLER32_SIMD_SSSE3) + +#include + +uint32_t ZLIB_INTERNAL adler32_simd_( /* SSSE3 */ + uint32_t adler, + const unsigned char *buf, + unsigned long len) +{ + /* + * Split Adler-32 into component sums. + */ + uint32_t s1 = adler & 0xffff; + uint32_t s2 = adler >> 16; + + /* + * Process the data in blocks. + */ + const unsigned BLOCK_SIZE = 1 << 5; + + unsigned long blocks = len / BLOCK_SIZE; + len -= blocks * BLOCK_SIZE; + + while (blocks) + { + unsigned n = NMAX / BLOCK_SIZE; /* The NMAX constraint. */ + if (n > blocks) + n = (unsigned) blocks; + blocks -= n; + + const __m128i tap1 = + _mm_setr_epi8(32,31,30,29,28,27,26,25,24,23,22,21,20,19,18,17); + const __m128i tap2 = + _mm_setr_epi8(16,15,14,13,12,11,10, 9, 8, 7, 6, 5, 4, 3, 2, 1); + const __m128i zero = + _mm_setr_epi8( 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0); + const __m128i ones = + _mm_set_epi16( 1, 1, 1, 1, 1, 1, 1, 1); + + /* + * Process n blocks of data. At most NMAX data bytes can be + * processed before s2 must be reduced modulo BASE. + */ + __m128i v_ps = _mm_set_epi32(0, 0, 0, s1 * n); + __m128i v_s2 = _mm_set_epi32(0, 0, 0, s2); + __m128i v_s1 = _mm_set_epi32(0, 0, 0, 0); + + do { + /* + * Load 32 input bytes. + */ + const __m128i bytes1 = _mm_loadu_si128((__m128i*)(buf)); + const __m128i bytes2 = _mm_loadu_si128((__m128i*)(buf + 16)); + + /* + * Add previous block byte sum to v_ps. + */ + v_ps = _mm_add_epi32(v_ps, v_s1); + + /* + * Horizontally add the bytes for s1, multiply-adds the + * bytes by [ 32, 31, 30, ... ] for s2. + */ + v_s1 = _mm_add_epi32(v_s1, _mm_sad_epu8(bytes1, zero)); + const __m128i mad1 = _mm_maddubs_epi16(bytes1, tap1); + v_s2 = _mm_add_epi32(v_s2, _mm_madd_epi16(mad1, ones)); + + v_s1 = _mm_add_epi32(v_s1, _mm_sad_epu8(bytes2, zero)); + const __m128i mad2 = _mm_maddubs_epi16(bytes2, tap2); + v_s2 = _mm_add_epi32(v_s2, _mm_madd_epi16(mad2, ones)); + + buf += BLOCK_SIZE; + + } while (--n); + + v_s2 = _mm_add_epi32(v_s2, _mm_slli_epi32(v_ps, 5)); + + /* + * Sum epi32 ints v_s1(s2) and accumulate in s1(s2). + */ + +#define S23O1 _MM_SHUFFLE(2,3,0,1) /* A B C D -> B A D C */ +#define S1O32 _MM_SHUFFLE(1,0,3,2) /* A B C D -> C D A B */ + + v_s1 = _mm_add_epi32(v_s1, _mm_shuffle_epi32(v_s1, S23O1)); + v_s1 = _mm_add_epi32(v_s1, _mm_shuffle_epi32(v_s1, S1O32)); + + s1 += _mm_cvtsi128_si32(v_s1); + + v_s2 = _mm_add_epi32(v_s2, _mm_shuffle_epi32(v_s2, S23O1)); + v_s2 = _mm_add_epi32(v_s2, _mm_shuffle_epi32(v_s2, S1O32)); + + s2 = _mm_cvtsi128_si32(v_s2); + +#undef S23O1 +#undef S1O32 + + /* + * Reduce. + */ + s1 %= BASE; + s2 %= BASE; + } + + /* + * Handle leftover data. + */ + if (len) { + if (len >= 16) { + s2 += (s1 += *buf++); + s2 += (s1 += *buf++); + s2 += (s1 += *buf++); + s2 += (s1 += *buf++); + + s2 += (s1 += *buf++); + s2 += (s1 += *buf++); + s2 += (s1 += *buf++); + s2 += (s1 += *buf++); + + s2 += (s1 += *buf++); + s2 += (s1 += *buf++); + s2 += (s1 += *buf++); + s2 += (s1 += *buf++); + + s2 += (s1 += *buf++); + s2 += (s1 += *buf++); + s2 += (s1 += *buf++); + s2 += (s1 += *buf++); + + len -= 16; + } + + while (len--) { + s2 += (s1 += *buf++); + } + + if (s1 >= BASE) + s1 -= BASE; + s2 %= BASE; + } + + /* + * Return the recombined sums. + */ + return s1 | (s2 << 16); +} + +#elif defined(ADLER32_SIMD_NEON) + +#include + +uint32_t ZLIB_INTERNAL adler32_simd_( /* NEON */ + uint32_t adler, + const unsigned char *buf, + unsigned long len) +{ + /* + * Split Adler-32 into component sums. + */ + uint32_t s1 = adler & 0xffff; + uint32_t s2 = adler >> 16; + + /* + * Serially compute s1 & s2, until the data is 16-byte aligned. + */ + if ((uintptr_t)buf & 15) { + while ((uintptr_t)buf & 15) { + s2 += (s1 += *buf++); + --len; + } + + if (s1 >= BASE) + s1 -= BASE; + s2 %= BASE; + } + + /* + * Process the data in blocks. + */ + const unsigned BLOCK_SIZE = 1 << 5; + + unsigned long blocks = len / BLOCK_SIZE; + len -= blocks * BLOCK_SIZE; + + while (blocks) + { + unsigned n = NMAX / BLOCK_SIZE; /* The NMAX constraint. */ + if (n > blocks) + n = blocks; + blocks -= n; + + /* + * Process n blocks of data. At most NMAX data bytes can be + * processed before s2 must be reduced modulo BASE. + */ + uint32x4_t v_s2 = (uint32x4_t) { 0, 0, 0, s1 * n }; + uint32x4_t v_s1 = (uint32x4_t) { 0, 0, 0, 0 }; + + uint16x8_t v_column_sum_1 = vdupq_n_u16(0); + uint16x8_t v_column_sum_2 = vdupq_n_u16(0); + uint16x8_t v_column_sum_3 = vdupq_n_u16(0); + uint16x8_t v_column_sum_4 = vdupq_n_u16(0); + + do { + /* + * Load 32 input bytes. + */ + const uint8x16_t bytes1 = vld1q_u8((uint8_t*)(buf)); + const uint8x16_t bytes2 = vld1q_u8((uint8_t*)(buf + 16)); + + /* + * Add previous block byte sum to v_s2. + */ + v_s2 = vaddq_u32(v_s2, v_s1); + + /* + * Horizontally add the bytes for s1. + */ + v_s1 = vpadalq_u16(v_s1, vpadalq_u8(vpaddlq_u8(bytes1), bytes2)); + + /* + * Vertically add the bytes for s2. + */ + v_column_sum_1 = vaddw_u8(v_column_sum_1, vget_low_u8 (bytes1)); + v_column_sum_2 = vaddw_u8(v_column_sum_2, vget_high_u8(bytes1)); + v_column_sum_3 = vaddw_u8(v_column_sum_3, vget_low_u8 (bytes2)); + v_column_sum_4 = vaddw_u8(v_column_sum_4, vget_high_u8(bytes2)); + + buf += BLOCK_SIZE; + + } while (--n); + + v_s2 = vshlq_n_u32(v_s2, 5); + + /* + * Multiply-add bytes by [ 32, 31, 30, ... ] for s2. + */ + v_s2 = vmlal_u16(v_s2, vget_low_u16 (v_column_sum_1), + (uint16x4_t) { 32, 31, 30, 29 }); + v_s2 = vmlal_u16(v_s2, vget_high_u16(v_column_sum_1), + (uint16x4_t) { 28, 27, 26, 25 }); + v_s2 = vmlal_u16(v_s2, vget_low_u16 (v_column_sum_2), + (uint16x4_t) { 24, 23, 22, 21 }); + v_s2 = vmlal_u16(v_s2, vget_high_u16(v_column_sum_2), + (uint16x4_t) { 20, 19, 18, 17 }); + v_s2 = vmlal_u16(v_s2, vget_low_u16 (v_column_sum_3), + (uint16x4_t) { 16, 15, 14, 13 }); + v_s2 = vmlal_u16(v_s2, vget_high_u16(v_column_sum_3), + (uint16x4_t) { 12, 11, 10, 9 }); + v_s2 = vmlal_u16(v_s2, vget_low_u16 (v_column_sum_4), + (uint16x4_t) { 8, 7, 6, 5 }); + v_s2 = vmlal_u16(v_s2, vget_high_u16(v_column_sum_4), + (uint16x4_t) { 4, 3, 2, 1 }); + + /* + * Sum epi32 ints v_s1(s2) and accumulate in s1(s2). + */ + uint32x2_t sum1 = vpadd_u32(vget_low_u32(v_s1), vget_high_u32(v_s1)); + uint32x2_t sum2 = vpadd_u32(vget_low_u32(v_s2), vget_high_u32(v_s2)); + uint32x2_t s1s2 = vpadd_u32(sum1, sum2); + + s1 += vget_lane_u32(s1s2, 0); + s2 += vget_lane_u32(s1s2, 1); + + /* + * Reduce. + */ + s1 %= BASE; + s2 %= BASE; + } + + /* + * Handle leftover data. + */ + if (len) { + if (len >= 16) { + s2 += (s1 += *buf++); + s2 += (s1 += *buf++); + s2 += (s1 += *buf++); + s2 += (s1 += *buf++); + + s2 += (s1 += *buf++); + s2 += (s1 += *buf++); + s2 += (s1 += *buf++); + s2 += (s1 += *buf++); + + s2 += (s1 += *buf++); + s2 += (s1 += *buf++); + s2 += (s1 += *buf++); + s2 += (s1 += *buf++); + + s2 += (s1 += *buf++); + s2 += (s1 += *buf++); + s2 += (s1 += *buf++); + s2 += (s1 += *buf++); + + len -= 16; + } + + while (len--) { + s2 += (s1 += *buf++); + } + + if (s1 >= BASE) + s1 -= BASE; + s2 %= BASE; + } + + /* + * Return the recombined sums. + */ + return s1 | (s2 << 16); +} + +#endif /* ADLER32_SIMD_SSSE3 */ diff --git a/external/zlib/adler32_simd.h b/external/zlib/adler32_simd.h new file mode 100644 index 00000000..285e392d --- /dev/null +++ b/external/zlib/adler32_simd.h @@ -0,0 +1,37 @@ +/* adler32_simd.h + * + * (C) 1995-2013 Jean-loup Gailly and Mark Adler + * + * This software is provided 'as-is', without any express or implied + * warranty. In no event will the authors be held liable for any damages + * arising from the use of this software. + * + * Permission is granted to anyone to use this software for any purpose, + * including commercial applications, and to alter it and redistribute it + * freely, subject to the following restrictions: + * + * 1. The origin of this software must not be misrepresented; you must not + * claim that you wrote the original software. If you use this software + * in a product, an acknowledgment in the product documentation would be + * appreciated but is not required. + * 2. Altered source versions must be plainly marked as such, and must not be + * misrepresented as being the original software. + * 3. This notice may not be removed or altered from any source distribution. + * + * Jean-loup Gailly Mark Adler + * jloup@gzip.org madler@alumni.caltech.edu + * + * Copyright 2017 The Chromium Authors. All rights reserved. + * Use of this source code is governed by a BSD-style license that can be + * found in the Chromium source repository LICENSE file. + */ + +#include + +#include "zconf.h" +#include "zutil.h" + +uint32_t ZLIB_INTERNAL adler32_simd_( + uint32_t adler, + const unsigned char *buf, + unsigned long len); diff --git a/external/zlib/amiga/Makefile.pup b/external/zlib/amiga/Makefile.pup new file mode 100644 index 00000000..8940c120 --- /dev/null +++ b/external/zlib/amiga/Makefile.pup @@ -0,0 +1,69 @@ +# Amiga powerUP (TM) Makefile +# makefile for libpng and SAS C V6.58/7.00 PPC compiler +# Copyright (C) 1998 by Andreas R. Kleinert + +LIBNAME = libzip.a + +CC = scppc +CFLAGS = NOSTKCHK NOSINT OPTIMIZE OPTGO OPTPEEP OPTINLOCAL OPTINL \ + OPTLOOP OPTRDEP=8 OPTDEP=8 OPTCOMP=8 NOVER +AR = ppc-amigaos-ar cr +RANLIB = ppc-amigaos-ranlib +LD = ppc-amigaos-ld -r +LDFLAGS = -o +LDLIBS = LIB:scppc.a LIB:end.o +RM = delete quiet + +OBJS = adler32.o compress.o crc32.o gzclose.o gzlib.o gzread.o gzwrite.o \ + uncompr.o deflate.o trees.o zutil.o inflate.o infback.o inftrees.o inffast.o + +TEST_OBJS = example.o minigzip.o + +all: example minigzip + +check: test +test: all + example + echo hello world | minigzip | minigzip -d + +$(LIBNAME): $(OBJS) + $(AR) $@ $(OBJS) + -$(RANLIB) $@ + +example: example.o $(LIBNAME) + $(LD) $(LDFLAGS) $@ LIB:c_ppc.o $@.o $(LIBNAME) $(LDLIBS) + +minigzip: minigzip.o $(LIBNAME) + $(LD) $(LDFLAGS) $@ LIB:c_ppc.o $@.o $(LIBNAME) $(LDLIBS) + +mostlyclean: clean +clean: + $(RM) *.o example minigzip $(LIBNAME) foo.gz + +zip: + zip -ul9 zlib README ChangeLog Makefile Make????.??? Makefile.?? \ + descrip.mms *.[ch] + +tgz: + cd ..; tar cfz zlib/zlib.tgz zlib/README zlib/ChangeLog zlib/Makefile \ + zlib/Make????.??? zlib/Makefile.?? zlib/descrip.mms zlib/*.[ch] + +# DO NOT DELETE THIS LINE -- make depend depends on it. + +adler32.o: zlib.h zconf.h +compress.o: zlib.h zconf.h +crc32.o: crc32.h zlib.h zconf.h +deflate.o: deflate.h zutil.h zlib.h zconf.h +example.o: zlib.h zconf.h +gzclose.o: zlib.h zconf.h gzguts.h +gzlib.o: zlib.h zconf.h gzguts.h +gzread.o: zlib.h zconf.h gzguts.h +gzwrite.o: zlib.h zconf.h gzguts.h +inffast.o: zutil.h zlib.h zconf.h inftrees.h inflate.h inffast.h +inflate.o: zutil.h zlib.h zconf.h inftrees.h inflate.h inffast.h +infback.o: zutil.h zlib.h zconf.h inftrees.h inflate.h inffast.h +inftrees.o: zutil.h zlib.h zconf.h inftrees.h +minigzip.o: zlib.h zconf.h +trees.o: deflate.h zutil.h zlib.h zconf.h trees.h +uncompr.o: zlib.h zconf.h +zutil.o: zutil.h zlib.h zconf.h diff --git a/external/zlib/amiga/Makefile.sas b/external/zlib/amiga/Makefile.sas new file mode 100644 index 00000000..749e2915 --- /dev/null +++ b/external/zlib/amiga/Makefile.sas @@ -0,0 +1,68 @@ +# SMakefile for zlib +# Modified from the standard UNIX Makefile Copyright Jean-loup Gailly +# Osma Ahvenlampi +# Amiga, SAS/C 6.56 & Smake + +CC=sc +CFLAGS=OPT +#CFLAGS=OPT CPU=68030 +#CFLAGS=DEBUG=LINE +LDFLAGS=LIB z.lib + +SCOPTIONS=OPTSCHED OPTINLINE OPTALIAS OPTTIME OPTINLOCAL STRMERGE \ + NOICONS PARMS=BOTH NOSTACKCHECK UTILLIB NOVERSION ERRORREXX \ + DEF=POSTINC + +OBJS = adler32.o compress.o crc32.o gzclose.o gzlib.o gzread.o gzwrite.o \ + uncompr.o deflate.o trees.o zutil.o inflate.o infback.o inftrees.o inffast.o + +TEST_OBJS = example.o minigzip.o + +all: SCOPTIONS example minigzip + +check: test +test: all + example + echo hello world | minigzip | minigzip -d + +install: z.lib + copy clone zlib.h zconf.h INCLUDE: + copy clone z.lib LIB: + +z.lib: $(OBJS) + oml z.lib r $(OBJS) + +example: example.o z.lib + $(CC) $(CFLAGS) LINK TO $@ example.o $(LDFLAGS) + +minigzip: minigzip.o z.lib + $(CC) $(CFLAGS) LINK TO $@ minigzip.o $(LDFLAGS) + +mostlyclean: clean +clean: + -delete force quiet example minigzip *.o z.lib foo.gz *.lnk SCOPTIONS + +SCOPTIONS: Makefile.sas + copy to $@ +#include "zutil.h" + +#define Z_STATIC_ASSERT(name, assert) typedef char name[(assert) ? 1 : -1] + +#if __STDC_VERSION__ >= 199901L +#define Z_RESTRICT restrict +#else +#define Z_RESTRICT +#endif + +#if defined(__clang__) || defined(__GNUC__) || defined(__llvm__) +#define Z_BUILTIN_MEMCPY __builtin_memcpy +#else +#define Z_BUILTIN_MEMCPY zmemcpy +#endif + +#if defined(INFLATE_CHUNK_SIMD_NEON) +#include +typedef uint8x16_t z_vec128i_t; +#elif defined(INFLATE_CHUNK_SIMD_SSE2) +#include +typedef __m128i z_vec128i_t; +#else +#error chunkcopy.h inflate chunk SIMD is not defined for your build target +#endif + +/* + * chunk copy type: the z_vec128i_t type size should be exactly 128-bits + * and equal to CHUNKCOPY_CHUNK_SIZE. + */ +#define CHUNKCOPY_CHUNK_SIZE sizeof(z_vec128i_t) + +Z_STATIC_ASSERT(vector_128_bits_wide, + CHUNKCOPY_CHUNK_SIZE == sizeof(int8_t) * 16); + +/* + * Ask the compiler to perform a wide, unaligned load with a machine + * instruction appropriate for the z_vec128i_t type. + */ +static inline z_vec128i_t loadchunk( + const unsigned char FAR* s) { + z_vec128i_t v; + Z_BUILTIN_MEMCPY(&v, s, sizeof(v)); + return v; +} + +/* + * Ask the compiler to perform a wide, unaligned store with a machine + * instruction appropriate for the z_vec128i_t type. + */ +static inline void storechunk( + unsigned char FAR* d, + const z_vec128i_t v) { + Z_BUILTIN_MEMCPY(d, &v, sizeof(v)); +} + +/* + * Perform a memcpy-like operation, assuming that length is non-zero and that + * it's OK to overwrite at least CHUNKCOPY_CHUNK_SIZE bytes of output even if + * the length is shorter than this. + * + * It also guarantees that it will properly unroll the data if the distance + * between `out` and `from` is at least CHUNKCOPY_CHUNK_SIZE, which we rely on + * in chunkcopy_relaxed(). + * + * Aside from better memory bus utilisation, this means that short copies + * (CHUNKCOPY_CHUNK_SIZE bytes or fewer) will fall straight through the loop + * without iteration, which will hopefully make the branch prediction more + * reliable. + */ +static inline unsigned char FAR* chunkcopy_core( + unsigned char FAR* out, + const unsigned char FAR* from, + unsigned len) { + const int bump = (--len % CHUNKCOPY_CHUNK_SIZE) + 1; + storechunk(out, loadchunk(from)); + out += bump; + from += bump; + len /= CHUNKCOPY_CHUNK_SIZE; + while (len-- > 0) { + storechunk(out, loadchunk(from)); + out += CHUNKCOPY_CHUNK_SIZE; + from += CHUNKCOPY_CHUNK_SIZE; + } + return out; +} + +/* + * Like chunkcopy_core(), but avoid writing beyond of legal output. + * + * Accepts an additional pointer to the end of safe output. A generic safe + * copy would use (out + len), but it's normally the case that the end of the + * output buffer is beyond the end of the current copy, and this can still be + * exploited. + */ +static inline unsigned char FAR* chunkcopy_core_safe( + unsigned char FAR* out, + const unsigned char FAR* from, + unsigned len, + unsigned char FAR* limit) { + Assert(out + len <= limit, "chunk copy exceeds safety limit"); + if ((limit - out) < (ptrdiff_t)CHUNKCOPY_CHUNK_SIZE) { + const unsigned char FAR* Z_RESTRICT rfrom = from; + if (len & 8) { + Z_BUILTIN_MEMCPY(out, rfrom, 8); + out += 8; + rfrom += 8; + } + if (len & 4) { + Z_BUILTIN_MEMCPY(out, rfrom, 4); + out += 4; + rfrom += 4; + } + if (len & 2) { + Z_BUILTIN_MEMCPY(out, rfrom, 2); + out += 2; + rfrom += 2; + } + if (len & 1) { + *out++ = *rfrom++; + } + return out; + } + return chunkcopy_core(out, from, len); +} + +/* + * Perform short copies until distance can be rewritten as being at least + * CHUNKCOPY_CHUNK_SIZE. + * + * Assumes it's OK to overwrite at least the first 2*CHUNKCOPY_CHUNK_SIZE + * bytes of output even if the copy is shorter than this. This assumption + * holds within zlib inflate_fast(), which starts every iteration with at + * least 258 bytes of output space available (258 being the maximum length + * output from a single token; see inffast.c). + */ +static inline unsigned char FAR* chunkunroll_relaxed( + unsigned char FAR* out, + unsigned FAR* dist, + unsigned FAR* len) { + const unsigned char FAR* from = out - *dist; + while (*dist < *len && *dist < CHUNKCOPY_CHUNK_SIZE) { + storechunk(out, loadchunk(from)); + out += *dist; + *len -= *dist; + *dist += *dist; + } + return out; +} + +#if defined(INFLATE_CHUNK_SIMD_NEON) +/* + * v_load64_dup(): load *src as an unaligned 64-bit int and duplicate it in + * every 64-bit component of the 128-bit result (64-bit int splat). + */ +static inline z_vec128i_t v_load64_dup(const void* src) { + return vcombine_u8(vld1_u8(src), vld1_u8(src)); +} + +/* + * v_load32_dup(): load *src as an unaligned 32-bit int and duplicate it in + * every 32-bit component of the 128-bit result (32-bit int splat). + */ +static inline z_vec128i_t v_load32_dup(const void* src) { + int32_t i32; + Z_BUILTIN_MEMCPY(&i32, src, sizeof(i32)); + return vreinterpretq_u8_s32(vdupq_n_s32(i32)); +} + +/* + * v_load16_dup(): load *src as an unaligned 16-bit int and duplicate it in + * every 16-bit component of the 128-bit result (16-bit int splat). + */ +static inline z_vec128i_t v_load16_dup(const void* src) { + int16_t i16; + Z_BUILTIN_MEMCPY(&i16, src, sizeof(i16)); + return vreinterpretq_u8_s16(vdupq_n_s16(i16)); +} + +/* + * v_load8_dup(): load the 8-bit int *src and duplicate it in every 8-bit + * component of the 128-bit result (8-bit int splat). + */ +static inline z_vec128i_t v_load8_dup(const void* src) { + return vld1q_dup_u8((const uint8_t*)src); +} + +/* + * v_store_128(): store the 128-bit vec in a memory destination (that might + * not be 16-byte aligned) void* out. + */ +static inline void v_store_128(void* out, const z_vec128i_t vec) { + vst1q_u8(out, vec); +} +#elif defined (INFLATE_CHUNK_SIMD_SSE2) +/* + * v_load64_dup(): load *src as an unaligned 64-bit int and duplicate it in + * every 64-bit component of the 128-bit result (64-bit int splat). + */ +static inline z_vec128i_t v_load64_dup(const void* src) { + int64_t i64; + Z_BUILTIN_MEMCPY(&i64, src, sizeof(i64)); + return _mm_set1_epi64x(i64); +} + +/* + * v_load32_dup(): load *src as an unaligned 32-bit int and duplicate it in + * every 32-bit component of the 128-bit result (32-bit int splat). + */ +static inline z_vec128i_t v_load32_dup(const void* src) { + int32_t i32; + Z_BUILTIN_MEMCPY(&i32, src, sizeof(i32)); + return _mm_set1_epi32(i32); +} + +/* + * v_load16_dup(): load *src as an unaligned 16-bit int and duplicate it in + * every 16-bit component of the 128-bit result (16-bit int splat). + */ +static inline z_vec128i_t v_load16_dup(const void* src) { + int16_t i16; + Z_BUILTIN_MEMCPY(&i16, src, sizeof(i16)); + return _mm_set1_epi16(i16); +} + +/* + * v_load8_dup(): load the 8-bit int *src and duplicate it in every 8-bit + * component of the 128-bit result (8-bit int splat). + */ +static inline z_vec128i_t v_load8_dup(const void* src) { + return _mm_set1_epi8(*(const char*)src); +} + +/* + * v_store_128(): store the 128-bit vec in a memory destination (that might + * not be 16-byte aligned) void* out. + */ +static inline void v_store_128(void* out, const z_vec128i_t vec) { + _mm_storeu_si128((__m128i*)out, vec); +} +#endif + +/* + * Perform an overlapping copy which behaves as a memset() operation, but + * supporting periods other than one, and assume that length is non-zero and + * that it's OK to overwrite at least CHUNKCOPY_CHUNK_SIZE*3 bytes of output + * even if the length is shorter than this. + */ +static inline unsigned char FAR* chunkset_core( + unsigned char FAR* out, + unsigned period, + unsigned len) { + z_vec128i_t v; + const int bump = ((len - 1) % sizeof(v)) + 1; + + switch (period) { + case 1: + v = v_load8_dup(out - 1); + v_store_128(out, v); + out += bump; + len -= bump; + while (len > 0) { + v_store_128(out, v); + out += sizeof(v); + len -= sizeof(v); + } + return out; + case 2: + v = v_load16_dup(out - 2); + v_store_128(out, v); + out += bump; + len -= bump; + if (len > 0) { + v = v_load16_dup(out - 2); + do { + v_store_128(out, v); + out += sizeof(v); + len -= sizeof(v); + } while (len > 0); + } + return out; + case 4: + v = v_load32_dup(out - 4); + v_store_128(out, v); + out += bump; + len -= bump; + if (len > 0) { + v = v_load32_dup(out - 4); + do { + v_store_128(out, v); + out += sizeof(v); + len -= sizeof(v); + } while (len > 0); + } + return out; + case 8: + v = v_load64_dup(out - 8); + v_store_128(out, v); + out += bump; + len -= bump; + if (len > 0) { + v = v_load64_dup(out - 8); + do { + v_store_128(out, v); + out += sizeof(v); + len -= sizeof(v); + } while (len > 0); + } + return out; + } + out = chunkunroll_relaxed(out, &period, &len); + return chunkcopy_core(out, out - period, len); +} + +/* + * Perform a memcpy-like operation, but assume that length is non-zero and that + * it's OK to overwrite at least CHUNKCOPY_CHUNK_SIZE bytes of output even if + * the length is shorter than this. + * + * Unlike chunkcopy_core() above, no guarantee is made regarding the behaviour + * of overlapping buffers, regardless of the distance between the pointers. + * This is reflected in the `restrict`-qualified pointers, allowing the + * compiler to re-order loads and stores. + */ +static inline unsigned char FAR* chunkcopy_relaxed( + unsigned char FAR* Z_RESTRICT out, + const unsigned char FAR* Z_RESTRICT from, + unsigned len) { + return chunkcopy_core(out, from, len); +} + +/* + * Like chunkcopy_relaxed(), but avoid writing beyond of legal output. + * + * Unlike chunkcopy_core_safe() above, no guarantee is made regarding the + * behaviour of overlapping buffers, regardless of the distance between the + * pointers. This is reflected in the `restrict`-qualified pointers, allowing + * the compiler to re-order loads and stores. + * + * Accepts an additional pointer to the end of safe output. A generic safe + * copy would use (out + len), but it's normally the case that the end of the + * output buffer is beyond the end of the current copy, and this can still be + * exploited. + */ +static inline unsigned char FAR* chunkcopy_safe( + unsigned char FAR* out, + const unsigned char FAR* Z_RESTRICT from, + unsigned len, + unsigned char FAR* limit) { + Assert(out + len <= limit, "chunk copy exceeds safety limit"); + return chunkcopy_core_safe(out, from, len, limit); +} + +/* + * Perform chunky copy within the same buffer, where the source and destination + * may potentially overlap. + * + * Assumes that len > 0 on entry, and that it's safe to write at least + * CHUNKCOPY_CHUNK_SIZE*3 bytes to the output. + */ +static inline unsigned char FAR* chunkcopy_lapped_relaxed( + unsigned char FAR* out, + unsigned dist, + unsigned len) { + if (dist < len && dist < CHUNKCOPY_CHUNK_SIZE) { + return chunkset_core(out, dist, len); + } + return chunkcopy_core(out, out - dist, len); +} + +/* + * Behave like chunkcopy_lapped_relaxed(), but avoid writing beyond of legal + * output. + * + * Accepts an additional pointer to the end of safe output. A generic safe + * copy would use (out + len), but it's normally the case that the end of the + * output buffer is beyond the end of the current copy, and this can still be + * exploited. + */ +static inline unsigned char FAR* chunkcopy_lapped_safe( + unsigned char FAR* out, + unsigned dist, + unsigned len, + unsigned char FAR* limit) { + Assert(out + len <= limit, "chunk copy exceeds safety limit"); + if ((limit - out) < (ptrdiff_t)(3 * CHUNKCOPY_CHUNK_SIZE)) { + /* TODO(cavalcantii): try harder to optimise this */ + while (len-- > 0) { + *out = *(out - dist); + out++; + } + return out; + } + return chunkcopy_lapped_relaxed(out, dist, len); +} + +/* TODO(cavalcanti): see crbug.com/1110083. */ +static inline unsigned char FAR* chunkcopy_safe_ugly(unsigned char FAR* out, + unsigned dist, + unsigned len, + unsigned char FAR* limit) { +#if defined(__GNUC__) && !defined(__clang__) + /* Speed is the same as using chunkcopy_safe + w/ GCC on ARM (tested gcc 6.3 and 7.5) and avoids + undefined behavior. + */ + return chunkcopy_core_safe(out, out - dist, len, limit); +#elif defined(__clang__) && !defined(__aarch64__) + /* Seems to perform better on 32bit (i.e. Android). */ + return chunkcopy_core_safe(out, out - dist, len, limit); +#else + /* Seems to perform better on 64-bit. */ + return chunkcopy_lapped_safe(out, dist, len, limit); +#endif +} + +/* + * The chunk-copy code above deals with writing the decoded DEFLATE data to + * the output with SIMD methods to increase decode speed. Reading the input + * to the DEFLATE decoder with a wide, SIMD method can also increase decode + * speed. This option is supported on little endian machines, and reads the + * input data in 64-bit (8 byte) chunks. + */ + +#ifdef INFLATE_CHUNK_READ_64LE +/* + * Buffer the input in a uint64_t (8 bytes) in the wide input reading case. + */ +typedef uint64_t inflate_holder_t; + +/* + * Ask the compiler to perform a wide, unaligned load of a uint64_t using a + * machine instruction appropriate for the uint64_t type. + */ +static inline inflate_holder_t read64le(const unsigned char FAR *in) { + inflate_holder_t input; + Z_BUILTIN_MEMCPY(&input, in, sizeof(input)); + return input; +} +#else +/* + * Otherwise, buffer the input bits using zlib's default input buffer type. + */ +typedef unsigned long inflate_holder_t; + +#endif /* INFLATE_CHUNK_READ_64LE */ + +#undef Z_STATIC_ASSERT +#undef Z_RESTRICT +#undef Z_BUILTIN_MEMCPY + +#endif /* CHUNKCOPY_H */ diff --git a/zlib/compress.c b/external/zlib/compress.c similarity index 100% rename from zlib/compress.c rename to external/zlib/compress.c diff --git a/external/zlib/configure b/external/zlib/configure new file mode 100755 index 00000000..6e22cbdf --- /dev/null +++ b/external/zlib/configure @@ -0,0 +1,931 @@ +#!/bin/sh +# configure script for zlib. +# +# Normally configure builds both a static and a shared library. +# If you want to build just a static library, use: ./configure --static +# +# To impose specific compiler or flags or install directory, use for example: +# prefix=$HOME CC=cc CFLAGS="-O4" ./configure +# or for csh/tcsh users: +# (setenv prefix $HOME; setenv CC cc; setenv CFLAGS "-O4"; ./configure) + +# Incorrect settings of CC or CFLAGS may prevent creating a shared library. +# If you have problems, try without defining CC and CFLAGS before reporting +# an error. + +# start off configure.log +echo -------------------- >> configure.log +echo $0 $* >> configure.log +date >> configure.log + +# set command prefix for cross-compilation +if [ -n "${CHOST}" ]; then + uname="`echo "${CHOST}" | sed -e 's/^[^-]*-\([^-]*\)$/\1/' -e 's/^[^-]*-[^-]*-\([^-]*\)$/\1/' -e 's/^[^-]*-[^-]*-\([^-]*\)-.*$/\1/'`" + CROSS_PREFIX="${CHOST}-" +fi + +# destination name for static library +STATICLIB=libz.a + +# extract zlib version numbers from zlib.h +VER=`sed -n -e '/VERSION "/s/.*"\(.*\)".*/\1/p' < zlib.h` +VER3=`sed -n -e '/VERSION "/s/.*"\([0-9]*\\.[0-9]*\\.[0-9]*\).*/\1/p' < zlib.h` +VER2=`sed -n -e '/VERSION "/s/.*"\([0-9]*\\.[0-9]*\)\\..*/\1/p' < zlib.h` +VER1=`sed -n -e '/VERSION "/s/.*"\([0-9]*\)\\..*/\1/p' < zlib.h` + +# establish commands for library building +if "${CROSS_PREFIX}ar" --version >/dev/null 2>/dev/null || test $? -lt 126; then + AR=${AR-"${CROSS_PREFIX}ar"} + test -n "${CROSS_PREFIX}" && echo Using ${AR} | tee -a configure.log +else + AR=${AR-"ar"} + test -n "${CROSS_PREFIX}" && echo Using ${AR} | tee -a configure.log +fi +ARFLAGS=${ARFLAGS-"rc"} +if "${CROSS_PREFIX}ranlib" --version >/dev/null 2>/dev/null || test $? -lt 126; then + RANLIB=${RANLIB-"${CROSS_PREFIX}ranlib"} + test -n "${CROSS_PREFIX}" && echo Using ${RANLIB} | tee -a configure.log +else + RANLIB=${RANLIB-"ranlib"} +fi +if "${CROSS_PREFIX}nm" --version >/dev/null 2>/dev/null || test $? -lt 126; then + NM=${NM-"${CROSS_PREFIX}nm"} + test -n "${CROSS_PREFIX}" && echo Using ${NM} | tee -a configure.log +else + NM=${NM-"nm"} +fi + +# set defaults before processing command line options +LDCONFIG=${LDCONFIG-"ldconfig"} +LDSHAREDLIBC="${LDSHAREDLIBC--lc}" +ARCHS= # target specific flags +TGT_ARCH=$(uname -m) # the name of target architecture +prefix=${prefix-/usr/local} +exec_prefix=${exec_prefix-'${prefix}'} +libdir=${libdir-'${exec_prefix}/lib'} +sharedlibdir=${sharedlibdir-'${libdir}'} +includedir=${includedir-'${prefix}/include'} +mandir=${mandir-'${prefix}/share/man'} +shared_ext='.so' +shared=1 +solo=0 +cover=0 +zprefix=0 +zconst=0 +build64=0 +gcc=0 +old_cc="$CC" +old_cflags="$CFLAGS" +OBJC='$(OBJZ) $(OBJG)' +PIC_OBJC='$(PIC_OBJZ) $(PIC_OBJG)' + +# leave this script, optionally in a bad way +leave() +{ + if test "$*" != "0"; then + echo "** $0 aborting." | tee -a configure.log + fi + rm -f $test.[co] $test $test$shared_ext $test.gcno ./--version + echo -------------------- >> configure.log + echo >> configure.log + echo >> configure.log + exit $1 +} + +# process command line options +while test $# -ge 1 +do +case "$1" in + -h* | --help) + echo 'usage:' | tee -a configure.log + echo ' configure [--const] [--zprefix] [--prefix=PREFIX] [--eprefix=EXPREFIX]' | tee -a configure.log + echo ' [--static] [--64] [--libdir=LIBDIR] [--sharedlibdir=LIBDIR]' | tee -a configure.log + echo ' [--includedir=INCLUDEDIR] [--archs="-arch i386 -arch x86_64"]' | tee -a configure.log + exit 0 ;; + -p*=* | --prefix=*) prefix=`echo $1 | sed 's/.*=//'`; shift ;; + -e*=* | --eprefix=*) exec_prefix=`echo $1 | sed 's/.*=//'`; shift ;; + -l*=* | --libdir=*) libdir=`echo $1 | sed 's/.*=//'`; shift ;; + --sharedlibdir=*) sharedlibdir=`echo $1 | sed 's/.*=//'`; shift ;; + -i*=* | --includedir=*) includedir=`echo $1 | sed 's/.*=//'`;shift ;; + -u*=* | --uname=*) uname=`echo $1 | sed 's/.*=//'`;shift ;; + -p* | --prefix) prefix="$2"; shift; shift ;; + -e* | --eprefix) exec_prefix="$2"; shift; shift ;; + -l* | --libdir) libdir="$2"; shift; shift ;; + -i* | --includedir) includedir="$2"; shift; shift ;; + -s* | --shared | --enable-shared) shared=1; shift ;; + -t | --static) shared=0; shift ;; + --solo) solo=1; shift ;; + --cover) cover=1; shift ;; + -z* | --zprefix) zprefix=1; shift ;; + -6* | --64) build64=1; shift ;; + -a*=* | --archs=*) ARCHS=`echo $1 | sed 's/.*=//'`; shift ;; + -T*=* | --target=*) TGT_ARCH=`echo $1 | sed 's/.*=//'`; shift ;; + --sysconfdir=*) echo "ignored option: --sysconfdir" | tee -a configure.log; shift ;; + --localstatedir=*) echo "ignored option: --localstatedir" | tee -a configure.log; shift ;; + -c* | --const) zconst=1; shift ;; + *) + echo "unknown option: $1" | tee -a configure.log + echo "$0 --help for help" | tee -a configure.log + leave 1;; + esac +done + +# temporary file name +test=ztest$$ + +# put arguments in log, also put test file in log if used in arguments +show() +{ + case "$*" in + *$test.c*) + echo === $test.c === >> configure.log + cat $test.c >> configure.log + echo === >> configure.log;; + esac + echo $* >> configure.log +} + +# check for gcc vs. cc and set compile and link flags based on the system identified by uname +cat > $test.c <&1` in + *gcc*) gcc=1 ;; +esac + +show $cc -c $test.c +if test "$gcc" -eq 1 && ($cc -c $test.c) >> configure.log 2>&1; then + echo ... using gcc >> configure.log + CC="$cc" + CFLAGS="${CFLAGS--O3} ${ARCHS}" + SFLAGS="${CFLAGS--O3} -fPIC" + LDFLAGS="${LDFLAGS} ${ARCHS}" + if test $build64 -eq 1; then + CFLAGS="${CFLAGS} -m64" + SFLAGS="${SFLAGS} -m64" + fi + if test "${ZLIBGCCWARN}" = "YES"; then + if test "$zconst" -eq 1; then + CFLAGS="${CFLAGS} -Wall -Wextra -Wcast-qual -pedantic -DZLIB_CONST" + else + CFLAGS="${CFLAGS} -Wall -Wextra -pedantic" + fi + fi + if test -z "$uname"; then + uname=`(uname -s || echo unknown) 2>/dev/null` + fi + case "$uname" in + Linux* | linux* | GNU | GNU/* | solaris*) + LDSHARED=${LDSHARED-"$cc -shared -Wl,-soname,libz.so.1,--version-script,zlib.map"} ;; + *BSD | *bsd* | DragonFly) + LDSHARED=${LDSHARED-"$cc -shared -Wl,-soname,libz.so.1,--version-script,zlib.map"} + LDCONFIG="ldconfig -m" ;; + CYGWIN* | Cygwin* | cygwin* | OS/2*) + EXE='.exe' ;; + MINGW* | mingw*) +# temporary bypass + rm -f $test.[co] $test $test$shared_ext + echo "Please use win32/Makefile.gcc instead." | tee -a configure.log + leave 1 + LDSHARED=${LDSHARED-"$cc -shared"} + LDSHAREDLIBC="" + EXE='.exe' ;; + QNX*) # This is for QNX6. I suppose that the QNX rule below is for QNX2,QNX4 + # (alain.bonnefoy@icbt.com) + LDSHARED=${LDSHARED-"$cc -shared -Wl,-hlibz.so.1"} ;; + HP-UX*) + LDSHARED=${LDSHARED-"$cc -shared $SFLAGS"} + case `(uname -m || echo unknown) 2>/dev/null` in + ia64) + shared_ext='.so' + SHAREDLIB='libz.so' ;; + *) + shared_ext='.sl' + SHAREDLIB='libz.sl' ;; + esac ;; + Darwin* | darwin*) + shared_ext='.dylib' + SHAREDLIB=libz$shared_ext + SHAREDLIBV=libz.$VER$shared_ext + SHAREDLIBM=libz.$VER1$shared_ext + LDSHARED=${LDSHARED-"$cc -dynamiclib -install_name $libdir/$SHAREDLIBM -compatibility_version $VER1 -current_version $VER3"} + if libtool -V 2>&1 | grep Apple > /dev/null; then + AR="libtool" + else + AR="/usr/bin/libtool" + fi + ARFLAGS="-o" ;; + *) LDSHARED=${LDSHARED-"$cc -shared"} ;; + esac +else + # find system name and corresponding cc options + CC=${CC-cc} + gcc=0 + echo ... using $CC >> configure.log + if test -z "$uname"; then + uname=`(uname -sr || echo unknown) 2>/dev/null` + fi + case "$uname" in + HP-UX*) SFLAGS=${CFLAGS-"-O +z"} + CFLAGS=${CFLAGS-"-O"} +# LDSHARED=${LDSHARED-"ld -b +vnocompatwarnings"} + LDSHARED=${LDSHARED-"ld -b"} + case `(uname -m || echo unknown) 2>/dev/null` in + ia64) + shared_ext='.so' + SHAREDLIB='libz.so' ;; + *) + shared_ext='.sl' + SHAREDLIB='libz.sl' ;; + esac ;; + IRIX*) SFLAGS=${CFLAGS-"-ansi -O2 -rpath ."} + CFLAGS=${CFLAGS-"-ansi -O2"} + LDSHARED=${LDSHARED-"cc -shared -Wl,-soname,libz.so.1"} ;; + OSF1\ V4*) SFLAGS=${CFLAGS-"-O -std1"} + CFLAGS=${CFLAGS-"-O -std1"} + LDFLAGS="${LDFLAGS} -Wl,-rpath,." + LDSHARED=${LDSHARED-"cc -shared -Wl,-soname,libz.so -Wl,-msym -Wl,-rpath,$(libdir) -Wl,-set_version,${VER}:1.0"} ;; + OSF1*) SFLAGS=${CFLAGS-"-O -std1"} + CFLAGS=${CFLAGS-"-O -std1"} + LDSHARED=${LDSHARED-"cc -shared -Wl,-soname,libz.so.1"} ;; + QNX*) SFLAGS=${CFLAGS-"-4 -O"} + CFLAGS=${CFLAGS-"-4 -O"} + LDSHARED=${LDSHARED-"cc"} + RANLIB=${RANLIB-"true"} + AR="cc" + ARFLAGS="-A" ;; + SCO_SV\ 3.2*) SFLAGS=${CFLAGS-"-O3 -dy -KPIC "} + CFLAGS=${CFLAGS-"-O3"} + LDSHARED=${LDSHARED-"cc -dy -KPIC -G"} ;; + SunOS\ 5* | solaris*) + LDSHARED=${LDSHARED-"cc -G -h libz$shared_ext.$VER1"} + SFLAGS=${CFLAGS-"-fast -KPIC"} + CFLAGS=${CFLAGS-"-fast"} + if test $build64 -eq 1; then + # old versions of SunPRO/Workshop/Studio don't support -m64, + # but newer ones do. Check for it. + flag64=`$CC -flags | egrep -- '^-m64'` + if test x"$flag64" != x"" ; then + CFLAGS="${CFLAGS} -m64" + SFLAGS="${SFLAGS} -m64" + else + case `(uname -m || echo unknown) 2>/dev/null` in + i86*) + SFLAGS="$SFLAGS -xarch=amd64" + CFLAGS="$CFLAGS -xarch=amd64" ;; + *) + SFLAGS="$SFLAGS -xarch=v9" + CFLAGS="$CFLAGS -xarch=v9" ;; + esac + fi + fi + ;; + SunOS\ 4*) SFLAGS=${CFLAGS-"-O2 -PIC"} + CFLAGS=${CFLAGS-"-O2"} + LDSHARED=${LDSHARED-"ld"} ;; + SunStudio\ 9*) SFLAGS=${CFLAGS-"-fast -xcode=pic32 -xtarget=ultra3 -xarch=v9b"} + CFLAGS=${CFLAGS-"-fast -xtarget=ultra3 -xarch=v9b"} + LDSHARED=${LDSHARED-"cc -xarch=v9b"} ;; + UNIX_System_V\ 4.2.0) + SFLAGS=${CFLAGS-"-KPIC -O"} + CFLAGS=${CFLAGS-"-O"} + LDSHARED=${LDSHARED-"cc -G"} ;; + UNIX_SV\ 4.2MP) + SFLAGS=${CFLAGS-"-Kconform_pic -O"} + CFLAGS=${CFLAGS-"-O"} + LDSHARED=${LDSHARED-"cc -G"} ;; + OpenUNIX\ 5) + SFLAGS=${CFLAGS-"-KPIC -O"} + CFLAGS=${CFLAGS-"-O"} + LDSHARED=${LDSHARED-"cc -G"} ;; + AIX*) # Courtesy of dbakker@arrayasolutions.com + SFLAGS=${CFLAGS-"-O -qmaxmem=8192"} + CFLAGS=${CFLAGS-"-O -qmaxmem=8192"} + LDSHARED=${LDSHARED-"xlc -G"} ;; + # send working options for other systems to zlib@gzip.org + *) SFLAGS=${CFLAGS-"-O"} + CFLAGS=${CFLAGS-"-O"} + LDSHARED=${LDSHARED-"cc -shared"} ;; + esac +fi + +# destination names for shared library if not defined above +SHAREDLIB=${SHAREDLIB-"libz$shared_ext"} +SHAREDLIBV=${SHAREDLIBV-"libz$shared_ext.$VER"} +SHAREDLIBM=${SHAREDLIBM-"libz$shared_ext.$VER1"} + +echo >> configure.log + +# define functions for testing compiler and library characteristics and logging the results + +cat > $test.c </dev/null; then + try() + { + show $* + test "`( $* ) 2>&1 | tee -a configure.log`" = "" + } + echo - using any output from compiler to indicate an error >> configure.log +else +try() +{ + show $* + ( $* ) >> configure.log 2>&1 + ret=$? + if test $ret -ne 0; then + echo "(exit code "$ret")" >> configure.log + fi + return $ret +} +fi + +tryboth() +{ + show $* + got=`( $* ) 2>&1` + ret=$? + printf %s "$got" >> configure.log + if test $ret -ne 0; then + return $ret + fi + test "$got" = "" +} + +cat > $test.c << EOF +int foo() { return 0; } +EOF +echo "Checking for obsessive-compulsive compiler options..." >> configure.log +if try $CC -c $CFLAGS $test.c; then + : +else + echo "Compiler error reporting is too harsh for $0 (perhaps remove -Werror)." | tee -a configure.log + leave 1 +fi + +echo >> configure.log + +# see if shared library build supported +cat > $test.c <> configure.log + show "$NM $test.o | grep _hello" + if test "`$NM $test.o | grep _hello | tee -a configure.log`" = ""; then + CPP="$CPP -DNO_UNDERLINE" + echo Checking for underline in external names... No. | tee -a configure.log + else + echo Checking for underline in external names... Yes. | tee -a configure.log + fi ;; +esac + +echo >> configure.log + +# check for large file support, and if none, check for fseeko() +cat > $test.c < +off64_t dummy = 0; +EOF +if try $CC -c $CFLAGS -D_LARGEFILE64_SOURCE=1 $test.c; then + CFLAGS="${CFLAGS} -D_LARGEFILE64_SOURCE=1" + SFLAGS="${SFLAGS} -D_LARGEFILE64_SOURCE=1" + ALL="${ALL} all64" + TEST="${TEST} test64" + echo "Checking for off64_t... Yes." | tee -a configure.log + echo "Checking for fseeko... Yes." | tee -a configure.log +else + echo "Checking for off64_t... No." | tee -a configure.log + echo >> configure.log + cat > $test.c < +int main(void) { + fseeko(NULL, 0, 0); + return 0; +} +EOF + if try $CC $CFLAGS -o $test $test.c; then + echo "Checking for fseeko... Yes." | tee -a configure.log + else + CFLAGS="${CFLAGS} -DNO_FSEEKO" + SFLAGS="${SFLAGS} -DNO_FSEEKO" + echo "Checking for fseeko... No." | tee -a configure.log + fi +fi + +echo >> configure.log + +# check for strerror() for use by gz* functions +cat > $test.c < +#include +int main() { return strlen(strerror(errno)); } +EOF +if try $CC $CFLAGS -o $test $test.c; then + echo "Checking for strerror... Yes." | tee -a configure.log +else + CFLAGS="${CFLAGS} -DNO_STRERROR" + SFLAGS="${SFLAGS} -DNO_STRERROR" + echo "Checking for strerror... No." | tee -a configure.log +fi + +# copy clean zconf.h for subsequent edits +cp -p zconf.h.in zconf.h + +echo >> configure.log + +# check for unistd.h and save result in zconf.h +cat > $test.c < +int main() { return 0; } +EOF +if try $CC -c $CFLAGS $test.c; then + sed < zconf.h "/^#ifdef HAVE_UNISTD_H.* may be/s/def HAVE_UNISTD_H\(.*\) may be/ 1\1 was/" > zconf.temp.h + mv zconf.temp.h zconf.h + echo "Checking for unistd.h... Yes." | tee -a configure.log +else + echo "Checking for unistd.h... No." | tee -a configure.log +fi + +echo >> configure.log + +# check for stdarg.h and save result in zconf.h +cat > $test.c < +int main() { return 0; } +EOF +if try $CC -c $CFLAGS $test.c; then + sed < zconf.h "/^#ifdef HAVE_STDARG_H.* may be/s/def HAVE_STDARG_H\(.*\) may be/ 1\1 was/" > zconf.temp.h + mv zconf.temp.h zconf.h + echo "Checking for stdarg.h... Yes." | tee -a configure.log +else + echo "Checking for stdarg.h... No." | tee -a configure.log +fi + +# if the z_ prefix was requested, save that in zconf.h +if test $zprefix -eq 1; then + sed < zconf.h "/#ifdef Z_PREFIX.* may be/s/def Z_PREFIX\(.*\) may be/ 1\1 was/" > zconf.temp.h + mv zconf.temp.h zconf.h + echo >> configure.log + echo "Using z_ prefix on all symbols." | tee -a configure.log +fi + +# if --solo compilation was requested, save that in zconf.h and remove gz stuff from object lists +if test $solo -eq 1; then + sed '/#define ZCONF_H/a\ +#define Z_SOLO + +' < zconf.h > zconf.temp.h + mv zconf.temp.h zconf.h +OBJC='$(OBJZ)' +PIC_OBJC='$(PIC_OBJZ)' +fi + +# if code coverage testing was requested, use older gcc if defined, e.g. "gcc-4.2" on Mac OS X +if test $cover -eq 1; then + CFLAGS="${CFLAGS} -fprofile-arcs -ftest-coverage" + if test -n "$GCC_CLASSIC"; then + CC=$GCC_CLASSIC + fi +fi + +echo >> configure.log + +# conduct a series of tests to resolve eight possible cases of using "vs" or "s" printf functions +# (using stdarg or not), with or without "n" (proving size of buffer), and with or without a +# return value. The most secure result is vsnprintf() with a return value. snprintf() with a +# return value is secure as well, but then gzprintf() will be limited to 20 arguments. +cat > $test.c < +#include +#include "zconf.h" +int main() +{ +#ifndef STDC + choke me +#endif + return 0; +} +EOF +if try $CC -c $CFLAGS $test.c; then + echo "Checking whether to use vs[n]printf() or s[n]printf()... using vs[n]printf()." | tee -a configure.log + + echo >> configure.log + cat > $test.c < +#include +int mytest(const char *fmt, ...) +{ + char buf[20]; + va_list ap; + va_start(ap, fmt); + vsnprintf(buf, sizeof(buf), fmt, ap); + va_end(ap); + return 0; +} +int main() +{ + return (mytest("Hello%d\n", 1)); +} +EOF + if try $CC $CFLAGS -o $test $test.c; then + echo "Checking for vsnprintf() in stdio.h... Yes." | tee -a configure.log + + echo >> configure.log + cat >$test.c < +#include +int mytest(const char *fmt, ...) +{ + int n; + char buf[20]; + va_list ap; + va_start(ap, fmt); + n = vsnprintf(buf, sizeof(buf), fmt, ap); + va_end(ap); + return n; +} +int main() +{ + return (mytest("Hello%d\n", 1)); +} +EOF + + if try $CC -c $CFLAGS $test.c; then + echo "Checking for return value of vsnprintf()... Yes." | tee -a configure.log + else + CFLAGS="$CFLAGS -DHAS_vsnprintf_void" + SFLAGS="$SFLAGS -DHAS_vsnprintf_void" + echo "Checking for return value of vsnprintf()... No." | tee -a configure.log + echo " WARNING: apparently vsnprintf() does not return a value. zlib" | tee -a configure.log + echo " can build but will be open to possible string-format security" | tee -a configure.log + echo " vulnerabilities." | tee -a configure.log + fi + else + CFLAGS="$CFLAGS -DNO_vsnprintf" + SFLAGS="$SFLAGS -DNO_vsnprintf" + echo "Checking for vsnprintf() in stdio.h... No." | tee -a configure.log + echo " WARNING: vsnprintf() not found, falling back to vsprintf(). zlib" | tee -a configure.log + echo " can build but will be open to possible buffer-overflow security" | tee -a configure.log + echo " vulnerabilities." | tee -a configure.log + + echo >> configure.log + cat >$test.c < +#include +int mytest(const char *fmt, ...) +{ + int n; + char buf[20]; + va_list ap; + va_start(ap, fmt); + n = vsprintf(buf, fmt, ap); + va_end(ap); + return n; +} +int main() +{ + return (mytest("Hello%d\n", 1)); +} +EOF + + if try $CC -c $CFLAGS $test.c; then + echo "Checking for return value of vsprintf()... Yes." | tee -a configure.log + else + CFLAGS="$CFLAGS -DHAS_vsprintf_void" + SFLAGS="$SFLAGS -DHAS_vsprintf_void" + echo "Checking for return value of vsprintf()... No." | tee -a configure.log + echo " WARNING: apparently vsprintf() does not return a value. zlib" | tee -a configure.log + echo " can build but will be open to possible string-format security" | tee -a configure.log + echo " vulnerabilities." | tee -a configure.log + fi + fi +else + echo "Checking whether to use vs[n]printf() or s[n]printf()... using s[n]printf()." | tee -a configure.log + + echo >> configure.log + cat >$test.c < +int mytest() +{ + char buf[20]; + snprintf(buf, sizeof(buf), "%s", "foo"); + return 0; +} +int main() +{ + return (mytest()); +} +EOF + + if try $CC $CFLAGS -o $test $test.c; then + echo "Checking for snprintf() in stdio.h... Yes." | tee -a configure.log + + echo >> configure.log + cat >$test.c < +int mytest() +{ + char buf[20]; + return snprintf(buf, sizeof(buf), "%s", "foo"); +} +int main() +{ + return (mytest()); +} +EOF + + if try $CC -c $CFLAGS $test.c; then + echo "Checking for return value of snprintf()... Yes." | tee -a configure.log + else + CFLAGS="$CFLAGS -DHAS_snprintf_void" + SFLAGS="$SFLAGS -DHAS_snprintf_void" + echo "Checking for return value of snprintf()... No." | tee -a configure.log + echo " WARNING: apparently snprintf() does not return a value. zlib" | tee -a configure.log + echo " can build but will be open to possible string-format security" | tee -a configure.log + echo " vulnerabilities." | tee -a configure.log + fi + else + CFLAGS="$CFLAGS -DNO_snprintf" + SFLAGS="$SFLAGS -DNO_snprintf" + echo "Checking for snprintf() in stdio.h... No." | tee -a configure.log + echo " WARNING: snprintf() not found, falling back to sprintf(). zlib" | tee -a configure.log + echo " can build but will be open to possible buffer-overflow security" | tee -a configure.log + echo " vulnerabilities." | tee -a configure.log + + echo >> configure.log + cat >$test.c < +int mytest() +{ + char buf[20]; + return sprintf(buf, "%s", "foo"); +} +int main() +{ + return (mytest()); +} +EOF + + if try $CC -c $CFLAGS $test.c; then + echo "Checking for return value of sprintf()... Yes." | tee -a configure.log + else + CFLAGS="$CFLAGS -DHAS_sprintf_void" + SFLAGS="$SFLAGS -DHAS_sprintf_void" + echo "Checking for return value of sprintf()... No." | tee -a configure.log + echo " WARNING: apparently sprintf() does not return a value. zlib" | tee -a configure.log + echo " can build but will be open to possible string-format security" | tee -a configure.log + echo " vulnerabilities." | tee -a configure.log + fi + fi +fi + +# see if we can hide zlib internal symbols that are linked between separate source files +if test "$gcc" -eq 1; then + echo >> configure.log + cat > $test.c < $test.c << EOF +#include +void foo(void) { + __m64 a, b; + _mm_add_si64(a, b); +} +EOF + if try $CC -msse2 $CFLAGS $test.c -c $test; then + CFLAGS="-DINFLATE_CHUNK_SIMD_SSE2 -msse2 -DINFLATE_CHUNK_READ_64LE $CFLAGS" + SFLAGS="-DINFLATE_CHUNK_SIMD_SSE2 -msse2 -DINFLATE_CHUNK_READ_64LE $SFLAGS" + echo "Checking for SSE2 support ... Yes" | tee -a configure.log + else + echo "Checking for SSE2 support ... No" | tee -a configure.log + leave 1 + fi + +# Check for SSSE3 support +cat > $test.c << EOF +#include +void foo(void) { + __m128i a; + _mm_abs_epi8(a); +} +EOF + if try $CC -mssse3 $CFLAGS $test.c -c $test; then + CFLAGS="-DADLER32_SIMD_SSSE3 -mssse3 $CFLAGS" + SFLAGS="-DADLER32_SIMD_SSSE3 -mssse3 $SFLAGS" + echo "Checking for SSSE3 support ... Yes" | tee -a configure.log + else + echo "Checking for SSSE3 support ... No" | tee -a configure.log + leave 1 + fi + + # Check for SSE4.2 and CRC support +cat > $test.c << EOF +#include +void foo(void) { + _mm_crc32_u32(0, 0); +} +EOF + + if try $CC -msse4.2 $CFLAGS $test.c -c $test; then + CFLAGS="-DHAS_SSE42 -msse4.2 $CFLAGS" + SFLAGS="-DHAS_SSE42 -msse4.2 $SFLAGS" + echo "Checking for CRC and SSE4.2 support ... Yes" | tee -a configure.log + else + echo "Checking for CRC and SSE4.2 support ... No" | tee -a configure.log + echo "CRC and SSE4.2 support is required" | tee -a configure.log + leave 1 + fi +#Project copied from zlib-ng: +# Check for PCLMUL support +cat > $test.c << EOF +#include +int main(void) { + __m128i a = _mm_setzero_si128(); + __m128i b = _mm_setzero_si128(); + __m128i c = _mm_clmulepi64_si128(a, b, 0x10); + (void)c; + return 0; +} +EOF + if try $CC -c -mpclmul $CFLAGS $test.c ; then + CFLAGS="-DHAS_PCLMUL -mpclmul $CFLAGS" + SFLAGS="-DHAS_PCLMUL -mpclmul $SFLAGS" + echo "Checking for PCLMUL support ... Yes" | tee -a configure.log + else + echo "Checking for PCLMUL support ... No" | tee -a configure.log + fi + +elif [ x$TGT_ARCH = "xaarch64" ] ; then + + # Check for NEON and CRC support +cat > $test.c << EOF +#include +#include +void foo(void) { + __crc32cw(0, 0); + vqsubq_u16(vmovq_n_u16(1), vmovq_n_u16(2)); +} +EOF + + if try $CC -march=armv8-a+crc $CFLAGS $test.c -c $test; then + CFLAGS="-march=armv8-a+crc -DADLER32_SIMD_NEON -DINFLATE_CHUNK_SIMD_NEON -DINFLATE_CHUNK_READ_64LE $CFLAGS" + SFLAGS="-march=armv8-a+crc -DADLER32_SIMD_NEON -DINFLATE_CHUNK_SIMD_NEON -DINFLATE_CHUNK_READ_64LE $SFLAGS" + echo "Checking for CRC and NEON support ... Yes" | tee -a configure.log + else + echo "Checking for CRC and NEON support ... No" | tee -a configure.log + echo "CRC and NEON support is required" | tee -a configure.log + leave 1 + fi + +fi # end of "Check amd64 hardware support" + +# show the results in the log +echo >> configure.log +echo ALL = $ALL >> configure.log +echo AR = $AR >> configure.log +echo ARFLAGS = $ARFLAGS >> configure.log +echo CC = $CC >> configure.log +echo CFLAGS = $CFLAGS >> configure.log +echo CPP = $CPP >> configure.log +echo EXE = $EXE >> configure.log +echo LDCONFIG = $LDCONFIG >> configure.log +echo LDFLAGS = $LDFLAGS >> configure.log +echo LDSHARED = $LDSHARED >> configure.log +echo LDSHAREDLIBC = $LDSHAREDLIBC >> configure.log +echo OBJC = $OBJC >> configure.log +echo PIC_OBJC = $PIC_OBJC >> configure.log +echo RANLIB = $RANLIB >> configure.log +echo SFLAGS = $SFLAGS >> configure.log +echo SHAREDLIB = $SHAREDLIB >> configure.log +echo SHAREDLIBM = $SHAREDLIBM >> configure.log +echo SHAREDLIBV = $SHAREDLIBV >> configure.log +echo STATICLIB = $STATICLIB >> configure.log +echo TEST = $TEST >> configure.log +echo VER = $VER >> configure.log +echo Z_U4 = $Z_U4 >> configure.log +echo exec_prefix = $exec_prefix >> configure.log +echo includedir = $includedir >> configure.log +echo libdir = $libdir >> configure.log +echo mandir = $mandir >> configure.log +echo prefix = $prefix >> configure.log +echo sharedlibdir = $sharedlibdir >> configure.log +echo uname = $uname >> configure.log + +# udpate Makefile with the configure results +sed < Makefile.in " +/^TGT_ARCH *=/s#=.*#=$TGT_ARCH# +/^CC *=/s#=.*#=$CC# +/^CFLAGS *=/s#=.*#=$CFLAGS# +/^SFLAGS *=/s#=.*#=$SFLAGS# +/^LDFLAGS *=/s#=.*#=$LDFLAGS# +/^LDSHARED *=/s#=.*#=$LDSHARED# +/^CPP *=/s#=.*#=$CPP# +/^STATICLIB *=/s#=.*#=$STATICLIB# +/^SHAREDLIB *=/s#=.*#=$SHAREDLIB# +/^SHAREDLIBV *=/s#=.*#=$SHAREDLIBV# +/^SHAREDLIBM *=/s#=.*#=$SHAREDLIBM# +/^AR *=/s#=.*#=$AR# +/^ARFLAGS *=/s#=.*#=$ARFLAGS# +/^RANLIB *=/s#=.*#=$RANLIB# +/^LDCONFIG *=/s#=.*#=$LDCONFIG# +/^LDSHAREDLIBC *=/s#=.*#=$LDSHAREDLIBC# +/^EXE *=/s#=.*#=$EXE# +/^prefix *=/s#=.*#=$prefix# +/^exec_prefix *=/s#=.*#=$exec_prefix# +/^libdir *=/s#=.*#=$libdir# +/^sharedlibdir *=/s#=.*#=$sharedlibdir# +/^includedir *=/s#=.*#=$includedir# +/^mandir *=/s#=.*#=$mandir# +/^OBJC *=/s#=.*#= $OBJC# +/^PIC_OBJC *=/s#=.*#= $PIC_OBJC# +/^all: */s#:.*#: $ALL# +/^test: */s#:.*#: $TEST# +" > Makefile + +# create zlib.pc with the configure results +sed < zlib.pc.in " +/^CC *=/s#=.*#=$CC# +/^CFLAGS *=/s#=.*#=$CFLAGS# +/^CPP *=/s#=.*#=$CPP# +/^LDSHARED *=/s#=.*#=$LDSHARED# +/^STATICLIB *=/s#=.*#=$STATICLIB# +/^SHAREDLIB *=/s#=.*#=$SHAREDLIB# +/^SHAREDLIBV *=/s#=.*#=$SHAREDLIBV# +/^SHAREDLIBM *=/s#=.*#=$SHAREDLIBM# +/^AR *=/s#=.*#=$AR# +/^ARFLAGS *=/s#=.*#=$ARFLAGS# +/^RANLIB *=/s#=.*#=$RANLIB# +/^EXE *=/s#=.*#=$EXE# +/^prefix *=/s#=.*#=$prefix# +/^exec_prefix *=/s#=.*#=$exec_prefix# +/^libdir *=/s#=.*#=$libdir# +/^sharedlibdir *=/s#=.*#=$sharedlibdir# +/^includedir *=/s#=.*#=$includedir# +/^mandir *=/s#=.*#=$mandir# +/^LDFLAGS *=/s#=.*#=$LDFLAGS# +" | sed -e " +s/\@VERSION\@/$VER/g; +" > zlib.pc + +# done +leave 0 diff --git a/zlib/crc32.c b/external/zlib/crc32.c similarity index 100% rename from zlib/crc32.c rename to external/zlib/crc32.c diff --git a/zlib/crc32.h b/external/zlib/crc32.h similarity index 100% rename from zlib/crc32.h rename to external/zlib/crc32.h diff --git a/external/zlib/crc32_simd.c b/external/zlib/crc32_simd.c new file mode 100644 index 00000000..cc68d4fc --- /dev/null +++ b/external/zlib/crc32_simd.c @@ -0,0 +1,244 @@ +/* crc32_simd.c + * + * Copyright 2017 The Chromium Authors. All rights reserved. + * Use of this source code is governed by a BSD-style license that can be + * found in the Chromium source repository LICENSE file. + */ + + +#include "crc32_simd.h" + +#if defined(CRC32_SIMD_SSE42_PCLMUL) + +/* + * crc32_sse42_simd_(): compute the crc32 of the buffer, where the buffer + * length must be at least 64, and a multiple of 16. Based on: + * + * "Fast CRC Computation for Generic Polynomials Using PCLMULQDQ Instruction" + * V. Gopal, E. Ozturk, et al., 2009, http://intel.ly/2ySEwL0 + */ + +#include +#include +#include + +uint32_t ZLIB_INTERNAL crc32_sse42_simd_( /* SSE4.2+PCLMUL */ + const unsigned char *buf, + z_size_t len, + uint32_t crc) +{ + /* + * Definitions of the bit-reflected domain constants k1,k2,k3, etc and + * the CRC32+Barrett polynomials given at the end of the paper. + */ + static const uint64_t zalign(16) k1k2[] = { 0x0154442bd4, 0x01c6e41596 }; + static const uint64_t zalign(16) k3k4[] = { 0x01751997d0, 0x00ccaa009e }; + static const uint64_t zalign(16) k5k0[] = { 0x0163cd6124, 0x0000000000 }; + static const uint64_t zalign(16) poly[] = { 0x01db710641, 0x01f7011641 }; + + __m128i x0, x1, x2, x3, x4, x5, x6, x7, x8, y5, y6, y7, y8; + + /* + * There's at least one block of 64. + */ + x1 = _mm_loadu_si128((__m128i *)(buf + 0x00)); + x2 = _mm_loadu_si128((__m128i *)(buf + 0x10)); + x3 = _mm_loadu_si128((__m128i *)(buf + 0x20)); + x4 = _mm_loadu_si128((__m128i *)(buf + 0x30)); + + x1 = _mm_xor_si128(x1, _mm_cvtsi32_si128(crc)); + + x0 = _mm_load_si128((__m128i *)k1k2); + + buf += 64; + len -= 64; + + /* + * Parallel fold blocks of 64, if any. + */ + while (len >= 64) + { + x5 = _mm_clmulepi64_si128(x1, x0, 0x00); + x6 = _mm_clmulepi64_si128(x2, x0, 0x00); + x7 = _mm_clmulepi64_si128(x3, x0, 0x00); + x8 = _mm_clmulepi64_si128(x4, x0, 0x00); + + x1 = _mm_clmulepi64_si128(x1, x0, 0x11); + x2 = _mm_clmulepi64_si128(x2, x0, 0x11); + x3 = _mm_clmulepi64_si128(x3, x0, 0x11); + x4 = _mm_clmulepi64_si128(x4, x0, 0x11); + + y5 = _mm_loadu_si128((__m128i *)(buf + 0x00)); + y6 = _mm_loadu_si128((__m128i *)(buf + 0x10)); + y7 = _mm_loadu_si128((__m128i *)(buf + 0x20)); + y8 = _mm_loadu_si128((__m128i *)(buf + 0x30)); + + x1 = _mm_xor_si128(x1, x5); + x2 = _mm_xor_si128(x2, x6); + x3 = _mm_xor_si128(x3, x7); + x4 = _mm_xor_si128(x4, x8); + + x1 = _mm_xor_si128(x1, y5); + x2 = _mm_xor_si128(x2, y6); + x3 = _mm_xor_si128(x3, y7); + x4 = _mm_xor_si128(x4, y8); + + buf += 64; + len -= 64; + } + + /* + * Fold into 128-bits. + */ + x0 = _mm_load_si128((__m128i *)k3k4); + + x5 = _mm_clmulepi64_si128(x1, x0, 0x00); + x1 = _mm_clmulepi64_si128(x1, x0, 0x11); + x1 = _mm_xor_si128(x1, x2); + x1 = _mm_xor_si128(x1, x5); + + x5 = _mm_clmulepi64_si128(x1, x0, 0x00); + x1 = _mm_clmulepi64_si128(x1, x0, 0x11); + x1 = _mm_xor_si128(x1, x3); + x1 = _mm_xor_si128(x1, x5); + + x5 = _mm_clmulepi64_si128(x1, x0, 0x00); + x1 = _mm_clmulepi64_si128(x1, x0, 0x11); + x1 = _mm_xor_si128(x1, x4); + x1 = _mm_xor_si128(x1, x5); + + /* + * Single fold blocks of 16, if any. + */ + while (len >= 16) + { + x2 = _mm_loadu_si128((__m128i *)buf); + + x5 = _mm_clmulepi64_si128(x1, x0, 0x00); + x1 = _mm_clmulepi64_si128(x1, x0, 0x11); + x1 = _mm_xor_si128(x1, x2); + x1 = _mm_xor_si128(x1, x5); + + buf += 16; + len -= 16; + } + + /* + * Fold 128-bits to 64-bits. + */ + x2 = _mm_clmulepi64_si128(x1, x0, 0x10); + x3 = _mm_setr_epi32(~0, 0, ~0, 0); + x1 = _mm_srli_si128(x1, 8); + x1 = _mm_xor_si128(x1, x2); + + x0 = _mm_loadl_epi64((__m128i*)k5k0); + + x2 = _mm_srli_si128(x1, 4); + x1 = _mm_and_si128(x1, x3); + x1 = _mm_clmulepi64_si128(x1, x0, 0x00); + x1 = _mm_xor_si128(x1, x2); + + /* + * Barret reduce to 32-bits. + */ + x0 = _mm_load_si128((__m128i*)poly); + + x2 = _mm_and_si128(x1, x3); + x2 = _mm_clmulepi64_si128(x2, x0, 0x10); + x2 = _mm_and_si128(x2, x3); + x2 = _mm_clmulepi64_si128(x2, x0, 0x00); + x1 = _mm_xor_si128(x1, x2); + + /* + * Return the crc32. + */ + return _mm_extract_epi32(x1, 1); +} + +#elif defined(CRC32_ARMV8_CRC32) + +/* CRC32 checksums using ARMv8-a crypto instructions. + * + * TODO: implement a version using the PMULL instruction. + */ + +#if defined(__clang__) +/* CRC32 intrinsics are #ifdef'ed out of arm_acle.h unless we build with an + * armv8 target, which is incompatible with ThinLTO optimizations on Android. + * (Namely, mixing and matching different module-level targets makes ThinLTO + * warn, and Android defaults to armv7-a. This restriction does not apply to + * function-level `target`s, however.) + * + * Since we only need four crc intrinsics, and since clang's implementation of + * those are just wrappers around compiler builtins, it's simplest to #define + * those builtins directly. If this #define list grows too much (or we depend on + * an intrinsic that isn't a trivial wrapper), we may have to find a better way + * to go about this. + * + * NOTE: clang currently complains that "'+soft-float-abi' is not a recognized + * feature for this target (ignoring feature)." This appears to be a harmless + * bug in clang. + */ +#define __crc32b __builtin_arm_crc32b +#define __crc32d __builtin_arm_crc32d +#define __crc32w __builtin_arm_crc32w +#define __crc32cw __builtin_arm_crc32cw + +#if defined(__aarch64__) +#define TARGET_ARMV8_WITH_CRC __attribute__((target("crc"))) +#else // !defined(__aarch64__) +#define TARGET_ARMV8_WITH_CRC __attribute__((target("armv8-a,crc"))) +#endif // defined(__aarch64__) + +#elif defined(__GNUC__) +/* For GCC, we are setting CRC extensions at module level, so ThinLTO is not + * allowed. We can just include arm_acle.h. + */ +#include +#define TARGET_ARMV8_WITH_CRC +#else // !defined(__GNUC__) && !defined(_aarch64__) +#error ARM CRC32 SIMD extensions only supported for Clang and GCC +#endif + +TARGET_ARMV8_WITH_CRC +uint32_t ZLIB_INTERNAL armv8_crc32_little(unsigned long crc, + const unsigned char *buf, + z_size_t len) +{ + uint32_t c = (uint32_t) ~crc; + + while (len && ((uintptr_t)buf & 7)) { + c = __crc32b(c, *buf++); + --len; + } + + const uint64_t *buf8 = (const uint64_t *)buf; + + while (len >= 64) { + c = __crc32d(c, *buf8++); + c = __crc32d(c, *buf8++); + c = __crc32d(c, *buf8++); + c = __crc32d(c, *buf8++); + + c = __crc32d(c, *buf8++); + c = __crc32d(c, *buf8++); + c = __crc32d(c, *buf8++); + c = __crc32d(c, *buf8++); + len -= 64; + } + + while (len >= 8) { + c = __crc32d(c, *buf8++); + len -= 8; + } + + buf = (const unsigned char *)buf8; + + while (len--) { + c = __crc32b(c, *buf++); + } + + return ~c; +} + +#endif \ No newline at end of file diff --git a/external/zlib/crc32_simd.h b/external/zlib/crc32_simd.h new file mode 100644 index 00000000..c8b35015 --- /dev/null +++ b/external/zlib/crc32_simd.h @@ -0,0 +1,69 @@ +//https://cs.chromium.org/chromium/src/third_party/zlib/crc32_simd.c +/* crc32_simd.h + * + * Copyright 2017 The Chromium Authors. All rights reserved. + * Use of this source code is governed by a BSD-style license that can be + * found in the Chromium source repository LICENSE file. + */ +#ifndef CRC32_SIMD_H +#define CRC32_SIMD_H + + +#include + +//#include "zconf.h" +//#include "zutil.h" +#include "deflate.h" + +//#ifndef local +// #define local static +//#endif + +//#ifndef z_crc_t +// #ifdef Z_U4 +// typedef Z_U4 z_crc_t; +// #else +// typedef unsigned long z_crc_t; +// #endif +//#endif +#ifdef HAS_PCLMUL + #define CRC32_SIMD_SSE42_PCLMUL +#endif + +#ifndef z_size_t + #define z_size_t size_t +#endif +#ifndef zalign + #ifdef _MSC_VER + #define zalign(x) __declspec(align(x)) + #else + #define zalign(x) __attribute__((aligned((x)))) + #endif +#endif + + + +/* + * crc32_sse42_simd_(): compute the crc32 of the buffer, where the buffer + * length must be at least 64, and a multiple of 16. + */ +uint32_t ZLIB_INTERNAL crc32_sse42_simd_( + const unsigned char *buf, + z_size_t len, + uint32_t crc); + +/* + * crc32_sse42_simd_ buffer size constraints: see the use in zlib/crc32.c + * for computing the crc32 of an arbitrary length buffer. + */ +#define Z_CRC32_SSE42_MINIMUM_LENGTH 64 +#define Z_CRC32_SSE42_CHUNKSIZE_MASK 15 + +/* + * CRC32 checksums using ARMv8-a crypto instructions. + */ +uint32_t ZLIB_INTERNAL armv8_crc32_little(unsigned long crc, + const unsigned char* buf, + z_size_t len); + +#endif /* CRC32_SIMD_H */ \ No newline at end of file diff --git a/zlib/deflate.c b/external/zlib/deflate.c similarity index 100% rename from zlib/deflate.c rename to external/zlib/deflate.c diff --git a/zlib/deflate.h b/external/zlib/deflate.h similarity index 100% rename from zlib/deflate.h rename to external/zlib/deflate.h diff --git a/external/zlib/doc/algorithm.txt b/external/zlib/doc/algorithm.txt new file mode 100644 index 00000000..c97f4950 --- /dev/null +++ b/external/zlib/doc/algorithm.txt @@ -0,0 +1,209 @@ +1. Compression algorithm (deflate) + +The deflation algorithm used by gzip (also zip and zlib) is a variation of +LZ77 (Lempel-Ziv 1977, see reference below). It finds duplicated strings in +the input data. The second occurrence of a string is replaced by a +pointer to the previous string, in the form of a pair (distance, +length). Distances are limited to 32K bytes, and lengths are limited +to 258 bytes. When a string does not occur anywhere in the previous +32K bytes, it is emitted as a sequence of literal bytes. (In this +description, `string' must be taken as an arbitrary sequence of bytes, +and is not restricted to printable characters.) + +Literals or match lengths are compressed with one Huffman tree, and +match distances are compressed with another tree. The trees are stored +in a compact form at the start of each block. The blocks can have any +size (except that the compressed data for one block must fit in +available memory). A block is terminated when deflate() determines that +it would be useful to start another block with fresh trees. (This is +somewhat similar to the behavior of LZW-based _compress_.) + +Duplicated strings are found using a hash table. All input strings of +length 3 are inserted in the hash table. A hash index is computed for +the next 3 bytes. If the hash chain for this index is not empty, all +strings in the chain are compared with the current input string, and +the longest match is selected. + +The hash chains are searched starting with the most recent strings, to +favor small distances and thus take advantage of the Huffman encoding. +The hash chains are singly linked. There are no deletions from the +hash chains, the algorithm simply discards matches that are too old. + +To avoid a worst-case situation, very long hash chains are arbitrarily +truncated at a certain length, determined by a runtime option (level +parameter of deflateInit). So deflate() does not always find the longest +possible match but generally finds a match which is long enough. + +deflate() also defers the selection of matches with a lazy evaluation +mechanism. After a match of length N has been found, deflate() searches for +a longer match at the next input byte. If a longer match is found, the +previous match is truncated to a length of one (thus producing a single +literal byte) and the process of lazy evaluation begins again. Otherwise, +the original match is kept, and the next match search is attempted only N +steps later. + +The lazy match evaluation is also subject to a runtime parameter. If +the current match is long enough, deflate() reduces the search for a longer +match, thus speeding up the whole process. If compression ratio is more +important than speed, deflate() attempts a complete second search even if +the first match is already long enough. + +The lazy match evaluation is not performed for the fastest compression +modes (level parameter 1 to 3). For these fast modes, new strings +are inserted in the hash table only when no match was found, or +when the match is not too long. This degrades the compression ratio +but saves time since there are both fewer insertions and fewer searches. + + +2. Decompression algorithm (inflate) + +2.1 Introduction + +The key question is how to represent a Huffman code (or any prefix code) so +that you can decode fast. The most important characteristic is that shorter +codes are much more common than longer codes, so pay attention to decoding the +short codes fast, and let the long codes take longer to decode. + +inflate() sets up a first level table that covers some number of bits of +input less than the length of longest code. It gets that many bits from the +stream, and looks it up in the table. The table will tell if the next +code is that many bits or less and how many, and if it is, it will tell +the value, else it will point to the next level table for which inflate() +grabs more bits and tries to decode a longer code. + +How many bits to make the first lookup is a tradeoff between the time it +takes to decode and the time it takes to build the table. If building the +table took no time (and if you had infinite memory), then there would only +be a first level table to cover all the way to the longest code. However, +building the table ends up taking a lot longer for more bits since short +codes are replicated many times in such a table. What inflate() does is +simply to make the number of bits in the first table a variable, and then +to set that variable for the maximum speed. + +For inflate, which has 286 possible codes for the literal/length tree, the size +of the first table is nine bits. Also the distance trees have 30 possible +values, and the size of the first table is six bits. Note that for each of +those cases, the table ended up one bit longer than the ``average'' code +length, i.e. the code length of an approximately flat code which would be a +little more than eight bits for 286 symbols and a little less than five bits +for 30 symbols. + + +2.2 More details on the inflate table lookup + +Ok, you want to know what this cleverly obfuscated inflate tree actually +looks like. You are correct that it's not a Huffman tree. It is simply a +lookup table for the first, let's say, nine bits of a Huffman symbol. The +symbol could be as short as one bit or as long as 15 bits. If a particular +symbol is shorter than nine bits, then that symbol's translation is duplicated +in all those entries that start with that symbol's bits. For example, if the +symbol is four bits, then it's duplicated 32 times in a nine-bit table. If a +symbol is nine bits long, it appears in the table once. + +If the symbol is longer than nine bits, then that entry in the table points +to another similar table for the remaining bits. Again, there are duplicated +entries as needed. The idea is that most of the time the symbol will be short +and there will only be one table look up. (That's whole idea behind data +compression in the first place.) For the less frequent long symbols, there +will be two lookups. If you had a compression method with really long +symbols, you could have as many levels of lookups as is efficient. For +inflate, two is enough. + +So a table entry either points to another table (in which case nine bits in +the above example are gobbled), or it contains the translation for the symbol +and the number of bits to gobble. Then you start again with the next +ungobbled bit. + +You may wonder: why not just have one lookup table for how ever many bits the +longest symbol is? The reason is that if you do that, you end up spending +more time filling in duplicate symbol entries than you do actually decoding. +At least for deflate's output that generates new trees every several 10's of +kbytes. You can imagine that filling in a 2^15 entry table for a 15-bit code +would take too long if you're only decoding several thousand symbols. At the +other extreme, you could make a new table for every bit in the code. In fact, +that's essentially a Huffman tree. But then you spend too much time +traversing the tree while decoding, even for short symbols. + +So the number of bits for the first lookup table is a trade of the time to +fill out the table vs. the time spent looking at the second level and above of +the table. + +Here is an example, scaled down: + +The code being decoded, with 10 symbols, from 1 to 6 bits long: + +A: 0 +B: 10 +C: 1100 +D: 11010 +E: 11011 +F: 11100 +G: 11101 +H: 11110 +I: 111110 +J: 111111 + +Let's make the first table three bits long (eight entries): + +000: A,1 +001: A,1 +010: A,1 +011: A,1 +100: B,2 +101: B,2 +110: -> table X (gobble 3 bits) +111: -> table Y (gobble 3 bits) + +Each entry is what the bits decode as and how many bits that is, i.e. how +many bits to gobble. Or the entry points to another table, with the number of +bits to gobble implicit in the size of the table. + +Table X is two bits long since the longest code starting with 110 is five bits +long: + +00: C,1 +01: C,1 +10: D,2 +11: E,2 + +Table Y is three bits long since the longest code starting with 111 is six +bits long: + +000: F,2 +001: F,2 +010: G,2 +011: G,2 +100: H,2 +101: H,2 +110: I,3 +111: J,3 + +So what we have here are three tables with a total of 20 entries that had to +be constructed. That's compared to 64 entries for a single table. Or +compared to 16 entries for a Huffman tree (six two entry tables and one four +entry table). Assuming that the code ideally represents the probability of +the symbols, it takes on the average 1.25 lookups per symbol. That's compared +to one lookup for the single table, or 1.66 lookups per symbol for the +Huffman tree. + +There, I think that gives you a picture of what's going on. For inflate, the +meaning of a particular symbol is often more than just a letter. It can be a +byte (a "literal"), or it can be either a length or a distance which +indicates a base value and a number of bits to fetch after the code that is +added to the base value. Or it might be the special end-of-block code. The +data structures created in inftrees.c try to encode all that information +compactly in the tables. + + +Jean-loup Gailly Mark Adler +jloup@gzip.org madler@alumni.caltech.edu + + +References: + +[LZ77] Ziv J., Lempel A., ``A Universal Algorithm for Sequential Data +Compression,'' IEEE Transactions on Information Theory, Vol. 23, No. 3, +pp. 337-343. + +``DEFLATE Compressed Data Format Specification'' available in +http://tools.ietf.org/html/rfc1951 diff --git a/external/zlib/doc/rfc1950.txt b/external/zlib/doc/rfc1950.txt new file mode 100644 index 00000000..ce6428a0 --- /dev/null +++ b/external/zlib/doc/rfc1950.txt @@ -0,0 +1,619 @@ + + + + + + +Network Working Group P. Deutsch +Request for Comments: 1950 Aladdin Enterprises +Category: Informational J-L. Gailly + Info-ZIP + May 1996 + + + ZLIB Compressed Data Format Specification version 3.3 + +Status of This Memo + + This memo provides information for the Internet community. This memo + does not specify an Internet standard of any kind. Distribution of + this memo is unlimited. + +IESG Note: + + The IESG takes no position on the validity of any Intellectual + Property Rights statements contained in this document. + +Notices + + Copyright (c) 1996 L. Peter Deutsch and Jean-Loup Gailly + + Permission is granted to copy and distribute this document for any + purpose and without charge, including translations into other + languages and incorporation into compilations, provided that the + copyright notice and this notice are preserved, and that any + substantive changes or deletions from the original are clearly + marked. + + A pointer to the latest version of this and related documentation in + HTML format can be found at the URL + . + +Abstract + + This specification defines a lossless compressed data format. The + data can be produced or consumed, even for an arbitrarily long + sequentially presented input data stream, using only an a priori + bounded amount of intermediate storage. The format presently uses + the DEFLATE compression method but can be easily extended to use + other compression methods. It can be implemented readily in a manner + not covered by patents. This specification also defines the ADLER-32 + checksum (an extension and improvement of the Fletcher checksum), + used for detection of data corruption, and provides an algorithm for + computing it. + + + + +Deutsch & Gailly Informational [Page 1] + +RFC 1950 ZLIB Compressed Data Format Specification May 1996 + + +Table of Contents + + 1. Introduction ................................................... 2 + 1.1. Purpose ................................................... 2 + 1.2. Intended audience ......................................... 3 + 1.3. Scope ..................................................... 3 + 1.4. Compliance ................................................ 3 + 1.5. Definitions of terms and conventions used ................ 3 + 1.6. Changes from previous versions ............................ 3 + 2. Detailed specification ......................................... 3 + 2.1. Overall conventions ....................................... 3 + 2.2. Data format ............................................... 4 + 2.3. Compliance ................................................ 7 + 3. References ..................................................... 7 + 4. Source code .................................................... 8 + 5. Security Considerations ........................................ 8 + 6. Acknowledgements ............................................... 8 + 7. Authors' Addresses ............................................. 8 + 8. Appendix: Rationale ............................................ 9 + 9. Appendix: Sample code ..........................................10 + +1. Introduction + + 1.1. Purpose + + The purpose of this specification is to define a lossless + compressed data format that: + + * Is independent of CPU type, operating system, file system, + and character set, and hence can be used for interchange; + + * Can be produced or consumed, even for an arbitrarily long + sequentially presented input data stream, using only an a + priori bounded amount of intermediate storage, and hence can + be used in data communications or similar structures such as + Unix filters; + + * Can use a number of different compression methods; + + * Can be implemented readily in a manner not covered by + patents, and hence can be practiced freely. + + The data format defined by this specification does not attempt to + allow random access to compressed data. + + + + + + + +Deutsch & Gailly Informational [Page 2] + +RFC 1950 ZLIB Compressed Data Format Specification May 1996 + + + 1.2. Intended audience + + This specification is intended for use by implementors of software + to compress data into zlib format and/or decompress data from zlib + format. + + The text of the specification assumes a basic background in + programming at the level of bits and other primitive data + representations. + + 1.3. Scope + + The specification specifies a compressed data format that can be + used for in-memory compression of a sequence of arbitrary bytes. + + 1.4. Compliance + + Unless otherwise indicated below, a compliant decompressor must be + able to accept and decompress any data set that conforms to all + the specifications presented here; a compliant compressor must + produce data sets that conform to all the specifications presented + here. + + 1.5. Definitions of terms and conventions used + + byte: 8 bits stored or transmitted as a unit (same as an octet). + (For this specification, a byte is exactly 8 bits, even on + machines which store a character on a number of bits different + from 8.) See below, for the numbering of bits within a byte. + + 1.6. Changes from previous versions + + Version 3.1 was the first public release of this specification. + In version 3.2, some terminology was changed and the Adler-32 + sample code was rewritten for clarity. In version 3.3, the + support for a preset dictionary was introduced, and the + specification was converted to RFC style. + +2. Detailed specification + + 2.1. Overall conventions + + In the diagrams below, a box like this: + + +---+ + | | <-- the vertical bars might be missing + +---+ + + + + +Deutsch & Gailly Informational [Page 3] + +RFC 1950 ZLIB Compressed Data Format Specification May 1996 + + + represents one byte; a box like this: + + +==============+ + | | + +==============+ + + represents a variable number of bytes. + + Bytes stored within a computer do not have a "bit order", since + they are always treated as a unit. However, a byte considered as + an integer between 0 and 255 does have a most- and least- + significant bit, and since we write numbers with the most- + significant digit on the left, we also write bytes with the most- + significant bit on the left. In the diagrams below, we number the + bits of a byte so that bit 0 is the least-significant bit, i.e., + the bits are numbered: + + +--------+ + |76543210| + +--------+ + + Within a computer, a number may occupy multiple bytes. All + multi-byte numbers in the format described here are stored with + the MOST-significant byte first (at the lower memory address). + For example, the decimal number 520 is stored as: + + 0 1 + +--------+--------+ + |00000010|00001000| + +--------+--------+ + ^ ^ + | | + | + less significant byte = 8 + + more significant byte = 2 x 256 + + 2.2. Data format + + A zlib stream has the following structure: + + 0 1 + +---+---+ + |CMF|FLG| (more-->) + +---+---+ + + + + + + + + +Deutsch & Gailly Informational [Page 4] + +RFC 1950 ZLIB Compressed Data Format Specification May 1996 + + + (if FLG.FDICT set) + + 0 1 2 3 + +---+---+---+---+ + | DICTID | (more-->) + +---+---+---+---+ + + +=====================+---+---+---+---+ + |...compressed data...| ADLER32 | + +=====================+---+---+---+---+ + + Any data which may appear after ADLER32 are not part of the zlib + stream. + + CMF (Compression Method and flags) + This byte is divided into a 4-bit compression method and a 4- + bit information field depending on the compression method. + + bits 0 to 3 CM Compression method + bits 4 to 7 CINFO Compression info + + CM (Compression method) + This identifies the compression method used in the file. CM = 8 + denotes the "deflate" compression method with a window size up + to 32K. This is the method used by gzip and PNG (see + references [1] and [2] in Chapter 3, below, for the reference + documents). CM = 15 is reserved. It might be used in a future + version of this specification to indicate the presence of an + extra field before the compressed data. + + CINFO (Compression info) + For CM = 8, CINFO is the base-2 logarithm of the LZ77 window + size, minus eight (CINFO=7 indicates a 32K window size). Values + of CINFO above 7 are not allowed in this version of the + specification. CINFO is not defined in this specification for + CM not equal to 8. + + FLG (FLaGs) + This flag byte is divided as follows: + + bits 0 to 4 FCHECK (check bits for CMF and FLG) + bit 5 FDICT (preset dictionary) + bits 6 to 7 FLEVEL (compression level) + + The FCHECK value must be such that CMF and FLG, when viewed as + a 16-bit unsigned integer stored in MSB order (CMF*256 + FLG), + is a multiple of 31. + + + + +Deutsch & Gailly Informational [Page 5] + +RFC 1950 ZLIB Compressed Data Format Specification May 1996 + + + FDICT (Preset dictionary) + If FDICT is set, a DICT dictionary identifier is present + immediately after the FLG byte. The dictionary is a sequence of + bytes which are initially fed to the compressor without + producing any compressed output. DICT is the Adler-32 checksum + of this sequence of bytes (see the definition of ADLER32 + below). The decompressor can use this identifier to determine + which dictionary has been used by the compressor. + + FLEVEL (Compression level) + These flags are available for use by specific compression + methods. The "deflate" method (CM = 8) sets these flags as + follows: + + 0 - compressor used fastest algorithm + 1 - compressor used fast algorithm + 2 - compressor used default algorithm + 3 - compressor used maximum compression, slowest algorithm + + The information in FLEVEL is not needed for decompression; it + is there to indicate if recompression might be worthwhile. + + compressed data + For compression method 8, the compressed data is stored in the + deflate compressed data format as described in the document + "DEFLATE Compressed Data Format Specification" by L. Peter + Deutsch. (See reference [3] in Chapter 3, below) + + Other compressed data formats are not specified in this version + of the zlib specification. + + ADLER32 (Adler-32 checksum) + This contains a checksum value of the uncompressed data + (excluding any dictionary data) computed according to Adler-32 + algorithm. This algorithm is a 32-bit extension and improvement + of the Fletcher algorithm, used in the ITU-T X.224 / ISO 8073 + standard. See references [4] and [5] in Chapter 3, below) + + Adler-32 is composed of two sums accumulated per byte: s1 is + the sum of all bytes, s2 is the sum of all s1 values. Both sums + are done modulo 65521. s1 is initialized to 1, s2 to zero. The + Adler-32 checksum is stored as s2*65536 + s1 in most- + significant-byte first (network) order. + + + + + + + + +Deutsch & Gailly Informational [Page 6] + +RFC 1950 ZLIB Compressed Data Format Specification May 1996 + + + 2.3. Compliance + + A compliant compressor must produce streams with correct CMF, FLG + and ADLER32, but need not support preset dictionaries. When the + zlib data format is used as part of another standard data format, + the compressor may use only preset dictionaries that are specified + by this other data format. If this other format does not use the + preset dictionary feature, the compressor must not set the FDICT + flag. + + A compliant decompressor must check CMF, FLG, and ADLER32, and + provide an error indication if any of these have incorrect values. + A compliant decompressor must give an error indication if CM is + not one of the values defined in this specification (only the + value 8 is permitted in this version), since another value could + indicate the presence of new features that would cause subsequent + data to be interpreted incorrectly. A compliant decompressor must + give an error indication if FDICT is set and DICTID is not the + identifier of a known preset dictionary. A decompressor may + ignore FLEVEL and still be compliant. When the zlib data format + is being used as a part of another standard format, a compliant + decompressor must support all the preset dictionaries specified by + the other format. When the other format does not use the preset + dictionary feature, a compliant decompressor must reject any + stream in which the FDICT flag is set. + +3. References + + [1] Deutsch, L.P.,"GZIP Compressed Data Format Specification", + available in ftp://ftp.uu.net/pub/archiving/zip/doc/ + + [2] Thomas Boutell, "PNG (Portable Network Graphics) specification", + available in ftp://ftp.uu.net/graphics/png/documents/ + + [3] Deutsch, L.P.,"DEFLATE Compressed Data Format Specification", + available in ftp://ftp.uu.net/pub/archiving/zip/doc/ + + [4] Fletcher, J. G., "An Arithmetic Checksum for Serial + Transmissions," IEEE Transactions on Communications, Vol. COM-30, + No. 1, January 1982, pp. 247-252. + + [5] ITU-T Recommendation X.224, Annex D, "Checksum Algorithms," + November, 1993, pp. 144, 145. (Available from + gopher://info.itu.ch). ITU-T X.244 is also the same as ISO 8073. + + + + + + + +Deutsch & Gailly Informational [Page 7] + +RFC 1950 ZLIB Compressed Data Format Specification May 1996 + + +4. Source code + + Source code for a C language implementation of a "zlib" compliant + library is available at ftp://ftp.uu.net/pub/archiving/zip/zlib/. + +5. Security Considerations + + A decoder that fails to check the ADLER32 checksum value may be + subject to undetected data corruption. + +6. Acknowledgements + + Trademarks cited in this document are the property of their + respective owners. + + Jean-Loup Gailly and Mark Adler designed the zlib format and wrote + the related software described in this specification. Glenn + Randers-Pehrson converted this document to RFC and HTML format. + +7. Authors' Addresses + + L. Peter Deutsch + Aladdin Enterprises + 203 Santa Margarita Ave. + Menlo Park, CA 94025 + + Phone: (415) 322-0103 (AM only) + FAX: (415) 322-1734 + EMail: + + + Jean-Loup Gailly + + EMail: + + Questions about the technical content of this specification can be + sent by email to + + Jean-Loup Gailly and + Mark Adler + + Editorial comments on this specification can be sent by email to + + L. Peter Deutsch and + Glenn Randers-Pehrson + + + + + + +Deutsch & Gailly Informational [Page 8] + +RFC 1950 ZLIB Compressed Data Format Specification May 1996 + + +8. Appendix: Rationale + + 8.1. Preset dictionaries + + A preset dictionary is specially useful to compress short input + sequences. The compressor can take advantage of the dictionary + context to encode the input in a more compact manner. The + decompressor can be initialized with the appropriate context by + virtually decompressing a compressed version of the dictionary + without producing any output. However for certain compression + algorithms such as the deflate algorithm this operation can be + achieved without actually performing any decompression. + + The compressor and the decompressor must use exactly the same + dictionary. The dictionary may be fixed or may be chosen among a + certain number of predefined dictionaries, according to the kind + of input data. The decompressor can determine which dictionary has + been chosen by the compressor by checking the dictionary + identifier. This document does not specify the contents of + predefined dictionaries, since the optimal dictionaries are + application specific. Standard data formats using this feature of + the zlib specification must precisely define the allowed + dictionaries. + + 8.2. The Adler-32 algorithm + + The Adler-32 algorithm is much faster than the CRC32 algorithm yet + still provides an extremely low probability of undetected errors. + + The modulo on unsigned long accumulators can be delayed for 5552 + bytes, so the modulo operation time is negligible. If the bytes + are a, b, c, the second sum is 3a + 2b + c + 3, and so is position + and order sensitive, unlike the first sum, which is just a + checksum. That 65521 is prime is important to avoid a possible + large class of two-byte errors that leave the check unchanged. + (The Fletcher checksum uses 255, which is not prime and which also + makes the Fletcher check insensitive to single byte changes 0 <-> + 255.) + + The sum s1 is initialized to 1 instead of zero to make the length + of the sequence part of s2, so that the length does not have to be + checked separately. (Any sequence of zeroes has a Fletcher + checksum of zero.) + + + + + + + + +Deutsch & Gailly Informational [Page 9] + +RFC 1950 ZLIB Compressed Data Format Specification May 1996 + + +9. Appendix: Sample code + + The following C code computes the Adler-32 checksum of a data buffer. + It is written for clarity, not for speed. The sample code is in the + ANSI C programming language. Non C users may find it easier to read + with these hints: + + & Bitwise AND operator. + >> Bitwise right shift operator. When applied to an + unsigned quantity, as here, right shift inserts zero bit(s) + at the left. + << Bitwise left shift operator. Left shift inserts zero + bit(s) at the right. + ++ "n++" increments the variable n. + % modulo operator: a % b is the remainder of a divided by b. + + #define BASE 65521 /* largest prime smaller than 65536 */ + + /* + Update a running Adler-32 checksum with the bytes buf[0..len-1] + and return the updated checksum. The Adler-32 checksum should be + initialized to 1. + + Usage example: + + unsigned long adler = 1L; + + while (read_buffer(buffer, length) != EOF) { + adler = update_adler32(adler, buffer, length); + } + if (adler != original_adler) error(); + */ + unsigned long update_adler32(unsigned long adler, + unsigned char *buf, int len) + { + unsigned long s1 = adler & 0xffff; + unsigned long s2 = (adler >> 16) & 0xffff; + int n; + + for (n = 0; n < len; n++) { + s1 = (s1 + buf[n]) % BASE; + s2 = (s2 + s1) % BASE; + } + return (s2 << 16) + s1; + } + + /* Return the adler32 of the bytes buf[0..len-1] */ + + + + +Deutsch & Gailly Informational [Page 10] + +RFC 1950 ZLIB Compressed Data Format Specification May 1996 + + + unsigned long adler32(unsigned char *buf, int len) + { + return update_adler32(1L, buf, len); + } + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +Deutsch & Gailly Informational [Page 11] + diff --git a/external/zlib/doc/rfc1951.txt b/external/zlib/doc/rfc1951.txt new file mode 100644 index 00000000..403c8c72 --- /dev/null +++ b/external/zlib/doc/rfc1951.txt @@ -0,0 +1,955 @@ + + + + + + +Network Working Group P. Deutsch +Request for Comments: 1951 Aladdin Enterprises +Category: Informational May 1996 + + + DEFLATE Compressed Data Format Specification version 1.3 + +Status of This Memo + + This memo provides information for the Internet community. This memo + does not specify an Internet standard of any kind. Distribution of + this memo is unlimited. + +IESG Note: + + The IESG takes no position on the validity of any Intellectual + Property Rights statements contained in this document. + +Notices + + Copyright (c) 1996 L. Peter Deutsch + + Permission is granted to copy and distribute this document for any + purpose and without charge, including translations into other + languages and incorporation into compilations, provided that the + copyright notice and this notice are preserved, and that any + substantive changes or deletions from the original are clearly + marked. + + A pointer to the latest version of this and related documentation in + HTML format can be found at the URL + . + +Abstract + + This specification defines a lossless compressed data format that + compresses data using a combination of the LZ77 algorithm and Huffman + coding, with efficiency comparable to the best currently available + general-purpose compression methods. The data can be produced or + consumed, even for an arbitrarily long sequentially presented input + data stream, using only an a priori bounded amount of intermediate + storage. The format can be implemented readily in a manner not + covered by patents. + + + + + + + + +Deutsch Informational [Page 1] + +RFC 1951 DEFLATE Compressed Data Format Specification May 1996 + + +Table of Contents + + 1. Introduction ................................................... 2 + 1.1. Purpose ................................................... 2 + 1.2. Intended audience ......................................... 3 + 1.3. Scope ..................................................... 3 + 1.4. Compliance ................................................ 3 + 1.5. Definitions of terms and conventions used ................ 3 + 1.6. Changes from previous versions ............................ 4 + 2. Compressed representation overview ............................. 4 + 3. Detailed specification ......................................... 5 + 3.1. Overall conventions ....................................... 5 + 3.1.1. Packing into bytes .................................. 5 + 3.2. Compressed block format ................................... 6 + 3.2.1. Synopsis of prefix and Huffman coding ............... 6 + 3.2.2. Use of Huffman coding in the "deflate" format ....... 7 + 3.2.3. Details of block format ............................. 9 + 3.2.4. Non-compressed blocks (BTYPE=00) ................... 11 + 3.2.5. Compressed blocks (length and distance codes) ...... 11 + 3.2.6. Compression with fixed Huffman codes (BTYPE=01) .... 12 + 3.2.7. Compression with dynamic Huffman codes (BTYPE=10) .. 13 + 3.3. Compliance ............................................... 14 + 4. Compression algorithm details ................................. 14 + 5. References .................................................... 16 + 6. Security Considerations ....................................... 16 + 7. Source code ................................................... 16 + 8. Acknowledgements .............................................. 16 + 9. Author's Address .............................................. 17 + +1. Introduction + + 1.1. Purpose + + The purpose of this specification is to define a lossless + compressed data format that: + * Is independent of CPU type, operating system, file system, + and character set, and hence can be used for interchange; + * Can be produced or consumed, even for an arbitrarily long + sequentially presented input data stream, using only an a + priori bounded amount of intermediate storage, and hence + can be used in data communications or similar structures + such as Unix filters; + * Compresses data with efficiency comparable to the best + currently available general-purpose compression methods, + and in particular considerably better than the "compress" + program; + * Can be implemented readily in a manner not covered by + patents, and hence can be practiced freely; + + + +Deutsch Informational [Page 2] + +RFC 1951 DEFLATE Compressed Data Format Specification May 1996 + + + * Is compatible with the file format produced by the current + widely used gzip utility, in that conforming decompressors + will be able to read data produced by the existing gzip + compressor. + + The data format defined by this specification does not attempt to: + + * Allow random access to compressed data; + * Compress specialized data (e.g., raster graphics) as well + as the best currently available specialized algorithms. + + A simple counting argument shows that no lossless compression + algorithm can compress every possible input data set. For the + format defined here, the worst case expansion is 5 bytes per 32K- + byte block, i.e., a size increase of 0.015% for large data sets. + English text usually compresses by a factor of 2.5 to 3; + executable files usually compress somewhat less; graphical data + such as raster images may compress much more. + + 1.2. Intended audience + + This specification is intended for use by implementors of software + to compress data into "deflate" format and/or decompress data from + "deflate" format. + + The text of the specification assumes a basic background in + programming at the level of bits and other primitive data + representations. Familiarity with the technique of Huffman coding + is helpful but not required. + + 1.3. Scope + + The specification specifies a method for representing a sequence + of bytes as a (usually shorter) sequence of bits, and a method for + packing the latter bit sequence into bytes. + + 1.4. Compliance + + Unless otherwise indicated below, a compliant decompressor must be + able to accept and decompress any data set that conforms to all + the specifications presented here; a compliant compressor must + produce data sets that conform to all the specifications presented + here. + + 1.5. Definitions of terms and conventions used + + Byte: 8 bits stored or transmitted as a unit (same as an octet). + For this specification, a byte is exactly 8 bits, even on machines + + + +Deutsch Informational [Page 3] + +RFC 1951 DEFLATE Compressed Data Format Specification May 1996 + + + which store a character on a number of bits different from eight. + See below, for the numbering of bits within a byte. + + String: a sequence of arbitrary bytes. + + 1.6. Changes from previous versions + + There have been no technical changes to the deflate format since + version 1.1 of this specification. In version 1.2, some + terminology was changed. Version 1.3 is a conversion of the + specification to RFC style. + +2. Compressed representation overview + + A compressed data set consists of a series of blocks, corresponding + to successive blocks of input data. The block sizes are arbitrary, + except that non-compressible blocks are limited to 65,535 bytes. + + Each block is compressed using a combination of the LZ77 algorithm + and Huffman coding. The Huffman trees for each block are independent + of those for previous or subsequent blocks; the LZ77 algorithm may + use a reference to a duplicated string occurring in a previous block, + up to 32K input bytes before. + + Each block consists of two parts: a pair of Huffman code trees that + describe the representation of the compressed data part, and a + compressed data part. (The Huffman trees themselves are compressed + using Huffman encoding.) The compressed data consists of a series of + elements of two types: literal bytes (of strings that have not been + detected as duplicated within the previous 32K input bytes), and + pointers to duplicated strings, where a pointer is represented as a + pair . The representation used in the + "deflate" format limits distances to 32K bytes and lengths to 258 + bytes, but does not limit the size of a block, except for + uncompressible blocks, which are limited as noted above. + + Each type of value (literals, distances, and lengths) in the + compressed data is represented using a Huffman code, using one code + tree for literals and lengths and a separate code tree for distances. + The code trees for each block appear in a compact form just before + the compressed data for that block. + + + + + + + + + + +Deutsch Informational [Page 4] + +RFC 1951 DEFLATE Compressed Data Format Specification May 1996 + + +3. Detailed specification + + 3.1. Overall conventions In the diagrams below, a box like this: + + +---+ + | | <-- the vertical bars might be missing + +---+ + + represents one byte; a box like this: + + +==============+ + | | + +==============+ + + represents a variable number of bytes. + + Bytes stored within a computer do not have a "bit order", since + they are always treated as a unit. However, a byte considered as + an integer between 0 and 255 does have a most- and least- + significant bit, and since we write numbers with the most- + significant digit on the left, we also write bytes with the most- + significant bit on the left. In the diagrams below, we number the + bits of a byte so that bit 0 is the least-significant bit, i.e., + the bits are numbered: + + +--------+ + |76543210| + +--------+ + + Within a computer, a number may occupy multiple bytes. All + multi-byte numbers in the format described here are stored with + the least-significant byte first (at the lower memory address). + For example, the decimal number 520 is stored as: + + 0 1 + +--------+--------+ + |00001000|00000010| + +--------+--------+ + ^ ^ + | | + | + more significant byte = 2 x 256 + + less significant byte = 8 + + 3.1.1. Packing into bytes + + This document does not address the issue of the order in which + bits of a byte are transmitted on a bit-sequential medium, + since the final data format described here is byte- rather than + + + +Deutsch Informational [Page 5] + +RFC 1951 DEFLATE Compressed Data Format Specification May 1996 + + + bit-oriented. However, we describe the compressed block format + in below, as a sequence of data elements of various bit + lengths, not a sequence of bytes. We must therefore specify + how to pack these data elements into bytes to form the final + compressed byte sequence: + + * Data elements are packed into bytes in order of + increasing bit number within the byte, i.e., starting + with the least-significant bit of the byte. + * Data elements other than Huffman codes are packed + starting with the least-significant bit of the data + element. + * Huffman codes are packed starting with the most- + significant bit of the code. + + In other words, if one were to print out the compressed data as + a sequence of bytes, starting with the first byte at the + *right* margin and proceeding to the *left*, with the most- + significant bit of each byte on the left as usual, one would be + able to parse the result from right to left, with fixed-width + elements in the correct MSB-to-LSB order and Huffman codes in + bit-reversed order (i.e., with the first bit of the code in the + relative LSB position). + + 3.2. Compressed block format + + 3.2.1. Synopsis of prefix and Huffman coding + + Prefix coding represents symbols from an a priori known + alphabet by bit sequences (codes), one code for each symbol, in + a manner such that different symbols may be represented by bit + sequences of different lengths, but a parser can always parse + an encoded string unambiguously symbol-by-symbol. + + We define a prefix code in terms of a binary tree in which the + two edges descending from each non-leaf node are labeled 0 and + 1 and in which the leaf nodes correspond one-for-one with (are + labeled with) the symbols of the alphabet; then the code for a + symbol is the sequence of 0's and 1's on the edges leading from + the root to the leaf labeled with that symbol. For example: + + + + + + + + + + + +Deutsch Informational [Page 6] + +RFC 1951 DEFLATE Compressed Data Format Specification May 1996 + + + /\ Symbol Code + 0 1 ------ ---- + / \ A 00 + /\ B B 1 + 0 1 C 011 + / \ D 010 + A /\ + 0 1 + / \ + D C + + A parser can decode the next symbol from an encoded input + stream by walking down the tree from the root, at each step + choosing the edge corresponding to the next input bit. + + Given an alphabet with known symbol frequencies, the Huffman + algorithm allows the construction of an optimal prefix code + (one which represents strings with those symbol frequencies + using the fewest bits of any possible prefix codes for that + alphabet). Such a code is called a Huffman code. (See + reference [1] in Chapter 5, references for additional + information on Huffman codes.) + + Note that in the "deflate" format, the Huffman codes for the + various alphabets must not exceed certain maximum code lengths. + This constraint complicates the algorithm for computing code + lengths from symbol frequencies. Again, see Chapter 5, + references for details. + + 3.2.2. Use of Huffman coding in the "deflate" format + + The Huffman codes used for each alphabet in the "deflate" + format have two additional rules: + + * All codes of a given bit length have lexicographically + consecutive values, in the same order as the symbols + they represent; + + * Shorter codes lexicographically precede longer codes. + + + + + + + + + + + + +Deutsch Informational [Page 7] + +RFC 1951 DEFLATE Compressed Data Format Specification May 1996 + + + We could recode the example above to follow this rule as + follows, assuming that the order of the alphabet is ABCD: + + Symbol Code + ------ ---- + A 10 + B 0 + C 110 + D 111 + + I.e., 0 precedes 10 which precedes 11x, and 110 and 111 are + lexicographically consecutive. + + Given this rule, we can define the Huffman code for an alphabet + just by giving the bit lengths of the codes for each symbol of + the alphabet in order; this is sufficient to determine the + actual codes. In our example, the code is completely defined + by the sequence of bit lengths (2, 1, 3, 3). The following + algorithm generates the codes as integers, intended to be read + from most- to least-significant bit. The code lengths are + initially in tree[I].Len; the codes are produced in + tree[I].Code. + + 1) Count the number of codes for each code length. Let + bl_count[N] be the number of codes of length N, N >= 1. + + 2) Find the numerical value of the smallest code for each + code length: + + code = 0; + bl_count[0] = 0; + for (bits = 1; bits <= MAX_BITS; bits++) { + code = (code + bl_count[bits-1]) << 1; + next_code[bits] = code; + } + + 3) Assign numerical values to all codes, using consecutive + values for all codes of the same length with the base + values determined at step 2. Codes that are never used + (which have a bit length of zero) must not be assigned a + value. + + for (n = 0; n <= max_code; n++) { + len = tree[n].Len; + if (len != 0) { + tree[n].Code = next_code[len]; + next_code[len]++; + } + + + +Deutsch Informational [Page 8] + +RFC 1951 DEFLATE Compressed Data Format Specification May 1996 + + + } + + Example: + + Consider the alphabet ABCDEFGH, with bit lengths (3, 3, 3, 3, + 3, 2, 4, 4). After step 1, we have: + + N bl_count[N] + - ----------- + 2 1 + 3 5 + 4 2 + + Step 2 computes the following next_code values: + + N next_code[N] + - ------------ + 1 0 + 2 0 + 3 2 + 4 14 + + Step 3 produces the following code values: + + Symbol Length Code + ------ ------ ---- + A 3 010 + B 3 011 + C 3 100 + D 3 101 + E 3 110 + F 2 00 + G 4 1110 + H 4 1111 + + 3.2.3. Details of block format + + Each block of compressed data begins with 3 header bits + containing the following data: + + first bit BFINAL + next 2 bits BTYPE + + Note that the header bits do not necessarily begin on a byte + boundary, since a block does not necessarily occupy an integral + number of bytes. + + + + + +Deutsch Informational [Page 9] + +RFC 1951 DEFLATE Compressed Data Format Specification May 1996 + + + BFINAL is set if and only if this is the last block of the data + set. + + BTYPE specifies how the data are compressed, as follows: + + 00 - no compression + 01 - compressed with fixed Huffman codes + 10 - compressed with dynamic Huffman codes + 11 - reserved (error) + + The only difference between the two compressed cases is how the + Huffman codes for the literal/length and distance alphabets are + defined. + + In all cases, the decoding algorithm for the actual data is as + follows: + + do + read block header from input stream. + if stored with no compression + skip any remaining bits in current partially + processed byte + read LEN and NLEN (see next section) + copy LEN bytes of data to output + otherwise + if compressed with dynamic Huffman codes + read representation of code trees (see + subsection below) + loop (until end of block code recognized) + decode literal/length value from input stream + if value < 256 + copy value (literal byte) to output stream + otherwise + if value = end of block (256) + break from loop + otherwise (value = 257..285) + decode distance from input stream + + move backwards distance bytes in the output + stream, and copy length bytes from this + position to the output stream. + end loop + while not last block + + Note that a duplicated string reference may refer to a string + in a previous block; i.e., the backward distance may cross one + or more block boundaries. However a distance cannot refer past + the beginning of the output stream. (An application using a + + + +Deutsch Informational [Page 10] + +RFC 1951 DEFLATE Compressed Data Format Specification May 1996 + + + preset dictionary might discard part of the output stream; a + distance can refer to that part of the output stream anyway) + Note also that the referenced string may overlap the current + position; for example, if the last 2 bytes decoded have values + X and Y, a string reference with + adds X,Y,X,Y,X to the output stream. + + We now specify each compression method in turn. + + 3.2.4. Non-compressed blocks (BTYPE=00) + + Any bits of input up to the next byte boundary are ignored. + The rest of the block consists of the following information: + + 0 1 2 3 4... + +---+---+---+---+================================+ + | LEN | NLEN |... LEN bytes of literal data...| + +---+---+---+---+================================+ + + LEN is the number of data bytes in the block. NLEN is the + one's complement of LEN. + + 3.2.5. Compressed blocks (length and distance codes) + + As noted above, encoded data blocks in the "deflate" format + consist of sequences of symbols drawn from three conceptually + distinct alphabets: either literal bytes, from the alphabet of + byte values (0..255), or pairs, + where the length is drawn from (3..258) and the distance is + drawn from (1..32,768). In fact, the literal and length + alphabets are merged into a single alphabet (0..285), where + values 0..255 represent literal bytes, the value 256 indicates + end-of-block, and values 257..285 represent length codes + (possibly in conjunction with extra bits following the symbol + code) as follows: + + + + + + + + + + + + + + + + +Deutsch Informational [Page 11] + +RFC 1951 DEFLATE Compressed Data Format Specification May 1996 + + + Extra Extra Extra + Code Bits Length(s) Code Bits Lengths Code Bits Length(s) + ---- ---- ------ ---- ---- ------- ---- ---- ------- + 257 0 3 267 1 15,16 277 4 67-82 + 258 0 4 268 1 17,18 278 4 83-98 + 259 0 5 269 2 19-22 279 4 99-114 + 260 0 6 270 2 23-26 280 4 115-130 + 261 0 7 271 2 27-30 281 5 131-162 + 262 0 8 272 2 31-34 282 5 163-194 + 263 0 9 273 3 35-42 283 5 195-226 + 264 0 10 274 3 43-50 284 5 227-257 + 265 1 11,12 275 3 51-58 285 0 258 + 266 1 13,14 276 3 59-66 + + The extra bits should be interpreted as a machine integer + stored with the most-significant bit first, e.g., bits 1110 + represent the value 14. + + Extra Extra Extra + Code Bits Dist Code Bits Dist Code Bits Distance + ---- ---- ---- ---- ---- ------ ---- ---- -------- + 0 0 1 10 4 33-48 20 9 1025-1536 + 1 0 2 11 4 49-64 21 9 1537-2048 + 2 0 3 12 5 65-96 22 10 2049-3072 + 3 0 4 13 5 97-128 23 10 3073-4096 + 4 1 5,6 14 6 129-192 24 11 4097-6144 + 5 1 7,8 15 6 193-256 25 11 6145-8192 + 6 2 9-12 16 7 257-384 26 12 8193-12288 + 7 2 13-16 17 7 385-512 27 12 12289-16384 + 8 3 17-24 18 8 513-768 28 13 16385-24576 + 9 3 25-32 19 8 769-1024 29 13 24577-32768 + + 3.2.6. Compression with fixed Huffman codes (BTYPE=01) + + The Huffman codes for the two alphabets are fixed, and are not + represented explicitly in the data. The Huffman code lengths + for the literal/length alphabet are: + + Lit Value Bits Codes + --------- ---- ----- + 0 - 143 8 00110000 through + 10111111 + 144 - 255 9 110010000 through + 111111111 + 256 - 279 7 0000000 through + 0010111 + 280 - 287 8 11000000 through + 11000111 + + + +Deutsch Informational [Page 12] + +RFC 1951 DEFLATE Compressed Data Format Specification May 1996 + + + The code lengths are sufficient to generate the actual codes, + as described above; we show the codes in the table for added + clarity. Literal/length values 286-287 will never actually + occur in the compressed data, but participate in the code + construction. + + Distance codes 0-31 are represented by (fixed-length) 5-bit + codes, with possible additional bits as shown in the table + shown in Paragraph 3.2.5, above. Note that distance codes 30- + 31 will never actually occur in the compressed data. + + 3.2.7. Compression with dynamic Huffman codes (BTYPE=10) + + The Huffman codes for the two alphabets appear in the block + immediately after the header bits and before the actual + compressed data, first the literal/length code and then the + distance code. Each code is defined by a sequence of code + lengths, as discussed in Paragraph 3.2.2, above. For even + greater compactness, the code length sequences themselves are + compressed using a Huffman code. The alphabet for code lengths + is as follows: + + 0 - 15: Represent code lengths of 0 - 15 + 16: Copy the previous code length 3 - 6 times. + The next 2 bits indicate repeat length + (0 = 3, ... , 3 = 6) + Example: Codes 8, 16 (+2 bits 11), + 16 (+2 bits 10) will expand to + 12 code lengths of 8 (1 + 6 + 5) + 17: Repeat a code length of 0 for 3 - 10 times. + (3 bits of length) + 18: Repeat a code length of 0 for 11 - 138 times + (7 bits of length) + + A code length of 0 indicates that the corresponding symbol in + the literal/length or distance alphabet will not occur in the + block, and should not participate in the Huffman code + construction algorithm given earlier. If only one distance + code is used, it is encoded using one bit, not zero bits; in + this case there is a single code length of one, with one unused + code. One distance code of zero bits means that there are no + distance codes used at all (the data is all literals). + + We can now define the format of the block: + + 5 Bits: HLIT, # of Literal/Length codes - 257 (257 - 286) + 5 Bits: HDIST, # of Distance codes - 1 (1 - 32) + 4 Bits: HCLEN, # of Code Length codes - 4 (4 - 19) + + + +Deutsch Informational [Page 13] + +RFC 1951 DEFLATE Compressed Data Format Specification May 1996 + + + (HCLEN + 4) x 3 bits: code lengths for the code length + alphabet given just above, in the order: 16, 17, 18, + 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15 + + These code lengths are interpreted as 3-bit integers + (0-7); as above, a code length of 0 means the + corresponding symbol (literal/length or distance code + length) is not used. + + HLIT + 257 code lengths for the literal/length alphabet, + encoded using the code length Huffman code + + HDIST + 1 code lengths for the distance alphabet, + encoded using the code length Huffman code + + The actual compressed data of the block, + encoded using the literal/length and distance Huffman + codes + + The literal/length symbol 256 (end of data), + encoded using the literal/length Huffman code + + The code length repeat codes can cross from HLIT + 257 to the + HDIST + 1 code lengths. In other words, all code lengths form + a single sequence of HLIT + HDIST + 258 values. + + 3.3. Compliance + + A compressor may limit further the ranges of values specified in + the previous section and still be compliant; for example, it may + limit the range of backward pointers to some value smaller than + 32K. Similarly, a compressor may limit the size of blocks so that + a compressible block fits in memory. + + A compliant decompressor must accept the full range of possible + values defined in the previous section, and must accept blocks of + arbitrary size. + +4. Compression algorithm details + + While it is the intent of this document to define the "deflate" + compressed data format without reference to any particular + compression algorithm, the format is related to the compressed + formats produced by LZ77 (Lempel-Ziv 1977, see reference [2] below); + since many variations of LZ77 are patented, it is strongly + recommended that the implementor of a compressor follow the general + algorithm presented here, which is known not to be patented per se. + The material in this section is not part of the definition of the + + + +Deutsch Informational [Page 14] + +RFC 1951 DEFLATE Compressed Data Format Specification May 1996 + + + specification per se, and a compressor need not follow it in order to + be compliant. + + The compressor terminates a block when it determines that starting a + new block with fresh trees would be useful, or when the block size + fills up the compressor's block buffer. + + The compressor uses a chained hash table to find duplicated strings, + using a hash function that operates on 3-byte sequences. At any + given point during compression, let XYZ be the next 3 input bytes to + be examined (not necessarily all different, of course). First, the + compressor examines the hash chain for XYZ. If the chain is empty, + the compressor simply writes out X as a literal byte and advances one + byte in the input. If the hash chain is not empty, indicating that + the sequence XYZ (or, if we are unlucky, some other 3 bytes with the + same hash function value) has occurred recently, the compressor + compares all strings on the XYZ hash chain with the actual input data + sequence starting at the current point, and selects the longest + match. + + The compressor searches the hash chains starting with the most recent + strings, to favor small distances and thus take advantage of the + Huffman encoding. The hash chains are singly linked. There are no + deletions from the hash chains; the algorithm simply discards matches + that are too old. To avoid a worst-case situation, very long hash + chains are arbitrarily truncated at a certain length, determined by a + run-time parameter. + + To improve overall compression, the compressor optionally defers the + selection of matches ("lazy matching"): after a match of length N has + been found, the compressor searches for a longer match starting at + the next input byte. If it finds a longer match, it truncates the + previous match to a length of one (thus producing a single literal + byte) and then emits the longer match. Otherwise, it emits the + original match, and, as described above, advances N bytes before + continuing. + + Run-time parameters also control this "lazy match" procedure. If + compression ratio is most important, the compressor attempts a + complete second search regardless of the length of the first match. + In the normal case, if the current match is "long enough", the + compressor reduces the search for a longer match, thus speeding up + the process. If speed is most important, the compressor inserts new + strings in the hash table only when no match was found, or when the + match is not "too long". This degrades the compression ratio but + saves time since there are both fewer insertions and fewer searches. + + + + + +Deutsch Informational [Page 15] + +RFC 1951 DEFLATE Compressed Data Format Specification May 1996 + + +5. References + + [1] Huffman, D. A., "A Method for the Construction of Minimum + Redundancy Codes", Proceedings of the Institute of Radio + Engineers, September 1952, Volume 40, Number 9, pp. 1098-1101. + + [2] Ziv J., Lempel A., "A Universal Algorithm for Sequential Data + Compression", IEEE Transactions on Information Theory, Vol. 23, + No. 3, pp. 337-343. + + [3] Gailly, J.-L., and Adler, M., ZLIB documentation and sources, + available in ftp://ftp.uu.net/pub/archiving/zip/doc/ + + [4] Gailly, J.-L., and Adler, M., GZIP documentation and sources, + available as gzip-*.tar in ftp://prep.ai.mit.edu/pub/gnu/ + + [5] Schwartz, E. S., and Kallick, B. "Generating a canonical prefix + encoding." Comm. ACM, 7,3 (Mar. 1964), pp. 166-169. + + [6] Hirschberg and Lelewer, "Efficient decoding of prefix codes," + Comm. ACM, 33,4, April 1990, pp. 449-459. + +6. Security Considerations + + Any data compression method involves the reduction of redundancy in + the data. Consequently, any corruption of the data is likely to have + severe effects and be difficult to correct. Uncompressed text, on + the other hand, will probably still be readable despite the presence + of some corrupted bytes. + + It is recommended that systems using this data format provide some + means of validating the integrity of the compressed data. See + reference [3], for example. + +7. Source code + + Source code for a C language implementation of a "deflate" compliant + compressor and decompressor is available within the zlib package at + ftp://ftp.uu.net/pub/archiving/zip/zlib/. + +8. Acknowledgements + + Trademarks cited in this document are the property of their + respective owners. + + Phil Katz designed the deflate format. Jean-Loup Gailly and Mark + Adler wrote the related software described in this specification. + Glenn Randers-Pehrson converted this document to RFC and HTML format. + + + +Deutsch Informational [Page 16] + +RFC 1951 DEFLATE Compressed Data Format Specification May 1996 + + +9. Author's Address + + L. Peter Deutsch + Aladdin Enterprises + 203 Santa Margarita Ave. + Menlo Park, CA 94025 + + Phone: (415) 322-0103 (AM only) + FAX: (415) 322-1734 + EMail: + + Questions about the technical content of this specification can be + sent by email to: + + Jean-Loup Gailly and + Mark Adler + + Editorial comments on this specification can be sent by email to: + + L. Peter Deutsch and + Glenn Randers-Pehrson + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +Deutsch Informational [Page 17] + diff --git a/external/zlib/doc/rfc1952.txt b/external/zlib/doc/rfc1952.txt new file mode 100644 index 00000000..a8e51b45 --- /dev/null +++ b/external/zlib/doc/rfc1952.txt @@ -0,0 +1,675 @@ + + + + + + +Network Working Group P. Deutsch +Request for Comments: 1952 Aladdin Enterprises +Category: Informational May 1996 + + + GZIP file format specification version 4.3 + +Status of This Memo + + This memo provides information for the Internet community. This memo + does not specify an Internet standard of any kind. Distribution of + this memo is unlimited. + +IESG Note: + + The IESG takes no position on the validity of any Intellectual + Property Rights statements contained in this document. + +Notices + + Copyright (c) 1996 L. Peter Deutsch + + Permission is granted to copy and distribute this document for any + purpose and without charge, including translations into other + languages and incorporation into compilations, provided that the + copyright notice and this notice are preserved, and that any + substantive changes or deletions from the original are clearly + marked. + + A pointer to the latest version of this and related documentation in + HTML format can be found at the URL + . + +Abstract + + This specification defines a lossless compressed data format that is + compatible with the widely used GZIP utility. The format includes a + cyclic redundancy check value for detecting data corruption. The + format presently uses the DEFLATE method of compression but can be + easily extended to use other compression methods. The format can be + implemented readily in a manner not covered by patents. + + + + + + + + + + +Deutsch Informational [Page 1] + +RFC 1952 GZIP File Format Specification May 1996 + + +Table of Contents + + 1. Introduction ................................................... 2 + 1.1. Purpose ................................................... 2 + 1.2. Intended audience ......................................... 3 + 1.3. Scope ..................................................... 3 + 1.4. Compliance ................................................ 3 + 1.5. Definitions of terms and conventions used ................. 3 + 1.6. Changes from previous versions ............................ 3 + 2. Detailed specification ......................................... 4 + 2.1. Overall conventions ....................................... 4 + 2.2. File format ............................................... 5 + 2.3. Member format ............................................. 5 + 2.3.1. Member header and trailer ........................... 6 + 2.3.1.1. Extra field ................................... 8 + 2.3.1.2. Compliance .................................... 9 + 3. References .................................................. 9 + 4. Security Considerations .................................... 10 + 5. Acknowledgements ........................................... 10 + 6. Author's Address ........................................... 10 + 7. Appendix: Jean-Loup Gailly's gzip utility .................. 11 + 8. Appendix: Sample CRC Code .................................. 11 + +1. Introduction + + 1.1. Purpose + + The purpose of this specification is to define a lossless + compressed data format that: + + * Is independent of CPU type, operating system, file system, + and character set, and hence can be used for interchange; + * Can compress or decompress a data stream (as opposed to a + randomly accessible file) to produce another data stream, + using only an a priori bounded amount of intermediate + storage, and hence can be used in data communications or + similar structures such as Unix filters; + * Compresses data with efficiency comparable to the best + currently available general-purpose compression methods, + and in particular considerably better than the "compress" + program; + * Can be implemented readily in a manner not covered by + patents, and hence can be practiced freely; + * Is compatible with the file format produced by the current + widely used gzip utility, in that conforming decompressors + will be able to read data produced by the existing gzip + compressor. + + + + +Deutsch Informational [Page 2] + +RFC 1952 GZIP File Format Specification May 1996 + + + The data format defined by this specification does not attempt to: + + * Provide random access to compressed data; + * Compress specialized data (e.g., raster graphics) as well as + the best currently available specialized algorithms. + + 1.2. Intended audience + + This specification is intended for use by implementors of software + to compress data into gzip format and/or decompress data from gzip + format. + + The text of the specification assumes a basic background in + programming at the level of bits and other primitive data + representations. + + 1.3. Scope + + The specification specifies a compression method and a file format + (the latter assuming only that a file can store a sequence of + arbitrary bytes). It does not specify any particular interface to + a file system or anything about character sets or encodings + (except for file names and comments, which are optional). + + 1.4. Compliance + + Unless otherwise indicated below, a compliant decompressor must be + able to accept and decompress any file that conforms to all the + specifications presented here; a compliant compressor must produce + files that conform to all the specifications presented here. The + material in the appendices is not part of the specification per se + and is not relevant to compliance. + + 1.5. Definitions of terms and conventions used + + byte: 8 bits stored or transmitted as a unit (same as an octet). + (For this specification, a byte is exactly 8 bits, even on + machines which store a character on a number of bits different + from 8.) See below for the numbering of bits within a byte. + + 1.6. Changes from previous versions + + There have been no technical changes to the gzip format since + version 4.1 of this specification. In version 4.2, some + terminology was changed, and the sample CRC code was rewritten for + clarity and to eliminate the requirement for the caller to do pre- + and post-conditioning. Version 4.3 is a conversion of the + specification to RFC style. + + + +Deutsch Informational [Page 3] + +RFC 1952 GZIP File Format Specification May 1996 + + +2. Detailed specification + + 2.1. Overall conventions + + In the diagrams below, a box like this: + + +---+ + | | <-- the vertical bars might be missing + +---+ + + represents one byte; a box like this: + + +==============+ + | | + +==============+ + + represents a variable number of bytes. + + Bytes stored within a computer do not have a "bit order", since + they are always treated as a unit. However, a byte considered as + an integer between 0 and 255 does have a most- and least- + significant bit, and since we write numbers with the most- + significant digit on the left, we also write bytes with the most- + significant bit on the left. In the diagrams below, we number the + bits of a byte so that bit 0 is the least-significant bit, i.e., + the bits are numbered: + + +--------+ + |76543210| + +--------+ + + This document does not address the issue of the order in which + bits of a byte are transmitted on a bit-sequential medium, since + the data format described here is byte- rather than bit-oriented. + + Within a computer, a number may occupy multiple bytes. All + multi-byte numbers in the format described here are stored with + the least-significant byte first (at the lower memory address). + For example, the decimal number 520 is stored as: + + 0 1 + +--------+--------+ + |00001000|00000010| + +--------+--------+ + ^ ^ + | | + | + more significant byte = 2 x 256 + + less significant byte = 8 + + + +Deutsch Informational [Page 4] + +RFC 1952 GZIP File Format Specification May 1996 + + + 2.2. File format + + A gzip file consists of a series of "members" (compressed data + sets). The format of each member is specified in the following + section. The members simply appear one after another in the file, + with no additional information before, between, or after them. + + 2.3. Member format + + Each member has the following structure: + + +---+---+---+---+---+---+---+---+---+---+ + |ID1|ID2|CM |FLG| MTIME |XFL|OS | (more-->) + +---+---+---+---+---+---+---+---+---+---+ + + (if FLG.FEXTRA set) + + +---+---+=================================+ + | XLEN |...XLEN bytes of "extra field"...| (more-->) + +---+---+=================================+ + + (if FLG.FNAME set) + + +=========================================+ + |...original file name, zero-terminated...| (more-->) + +=========================================+ + + (if FLG.FCOMMENT set) + + +===================================+ + |...file comment, zero-terminated...| (more-->) + +===================================+ + + (if FLG.FHCRC set) + + +---+---+ + | CRC16 | + +---+---+ + + +=======================+ + |...compressed blocks...| (more-->) + +=======================+ + + 0 1 2 3 4 5 6 7 + +---+---+---+---+---+---+---+---+ + | CRC32 | ISIZE | + +---+---+---+---+---+---+---+---+ + + + + +Deutsch Informational [Page 5] + +RFC 1952 GZIP File Format Specification May 1996 + + + 2.3.1. Member header and trailer + + ID1 (IDentification 1) + ID2 (IDentification 2) + These have the fixed values ID1 = 31 (0x1f, \037), ID2 = 139 + (0x8b, \213), to identify the file as being in gzip format. + + CM (Compression Method) + This identifies the compression method used in the file. CM + = 0-7 are reserved. CM = 8 denotes the "deflate" + compression method, which is the one customarily used by + gzip and which is documented elsewhere. + + FLG (FLaGs) + This flag byte is divided into individual bits as follows: + + bit 0 FTEXT + bit 1 FHCRC + bit 2 FEXTRA + bit 3 FNAME + bit 4 FCOMMENT + bit 5 reserved + bit 6 reserved + bit 7 reserved + + If FTEXT is set, the file is probably ASCII text. This is + an optional indication, which the compressor may set by + checking a small amount of the input data to see whether any + non-ASCII characters are present. In case of doubt, FTEXT + is cleared, indicating binary data. For systems which have + different file formats for ascii text and binary data, the + decompressor can use FTEXT to choose the appropriate format. + We deliberately do not specify the algorithm used to set + this bit, since a compressor always has the option of + leaving it cleared and a decompressor always has the option + of ignoring it and letting some other program handle issues + of data conversion. + + If FHCRC is set, a CRC16 for the gzip header is present, + immediately before the compressed data. The CRC16 consists + of the two least significant bytes of the CRC32 for all + bytes of the gzip header up to and not including the CRC16. + [The FHCRC bit was never set by versions of gzip up to + 1.2.4, even though it was documented with a different + meaning in gzip 1.2.4.] + + If FEXTRA is set, optional extra fields are present, as + described in a following section. + + + +Deutsch Informational [Page 6] + +RFC 1952 GZIP File Format Specification May 1996 + + + If FNAME is set, an original file name is present, + terminated by a zero byte. The name must consist of ISO + 8859-1 (LATIN-1) characters; on operating systems using + EBCDIC or any other character set for file names, the name + must be translated to the ISO LATIN-1 character set. This + is the original name of the file being compressed, with any + directory components removed, and, if the file being + compressed is on a file system with case insensitive names, + forced to lower case. There is no original file name if the + data was compressed from a source other than a named file; + for example, if the source was stdin on a Unix system, there + is no file name. + + If FCOMMENT is set, a zero-terminated file comment is + present. This comment is not interpreted; it is only + intended for human consumption. The comment must consist of + ISO 8859-1 (LATIN-1) characters. Line breaks should be + denoted by a single line feed character (10 decimal). + + Reserved FLG bits must be zero. + + MTIME (Modification TIME) + This gives the most recent modification time of the original + file being compressed. The time is in Unix format, i.e., + seconds since 00:00:00 GMT, Jan. 1, 1970. (Note that this + may cause problems for MS-DOS and other systems that use + local rather than Universal time.) If the compressed data + did not come from a file, MTIME is set to the time at which + compression started. MTIME = 0 means no time stamp is + available. + + XFL (eXtra FLags) + These flags are available for use by specific compression + methods. The "deflate" method (CM = 8) sets these flags as + follows: + + XFL = 2 - compressor used maximum compression, + slowest algorithm + XFL = 4 - compressor used fastest algorithm + + OS (Operating System) + This identifies the type of file system on which compression + took place. This may be useful in determining end-of-line + convention for text files. The currently defined values are + as follows: + + + + + + +Deutsch Informational [Page 7] + +RFC 1952 GZIP File Format Specification May 1996 + + + 0 - FAT filesystem (MS-DOS, OS/2, NT/Win32) + 1 - Amiga + 2 - VMS (or OpenVMS) + 3 - Unix + 4 - VM/CMS + 5 - Atari TOS + 6 - HPFS filesystem (OS/2, NT) + 7 - Macintosh + 8 - Z-System + 9 - CP/M + 10 - TOPS-20 + 11 - NTFS filesystem (NT) + 12 - QDOS + 13 - Acorn RISCOS + 255 - unknown + + XLEN (eXtra LENgth) + If FLG.FEXTRA is set, this gives the length of the optional + extra field. See below for details. + + CRC32 (CRC-32) + This contains a Cyclic Redundancy Check value of the + uncompressed data computed according to CRC-32 algorithm + used in the ISO 3309 standard and in section 8.1.1.6.2 of + ITU-T recommendation V.42. (See http://www.iso.ch for + ordering ISO documents. See gopher://info.itu.ch for an + online version of ITU-T V.42.) + + ISIZE (Input SIZE) + This contains the size of the original (uncompressed) input + data modulo 2^32. + + 2.3.1.1. Extra field + + If the FLG.FEXTRA bit is set, an "extra field" is present in + the header, with total length XLEN bytes. It consists of a + series of subfields, each of the form: + + +---+---+---+---+==================================+ + |SI1|SI2| LEN |... LEN bytes of subfield data ...| + +---+---+---+---+==================================+ + + SI1 and SI2 provide a subfield ID, typically two ASCII letters + with some mnemonic value. Jean-Loup Gailly + is maintaining a registry of subfield + IDs; please send him any subfield ID you wish to use. Subfield + IDs with SI2 = 0 are reserved for future use. The following + IDs are currently defined: + + + +Deutsch Informational [Page 8] + +RFC 1952 GZIP File Format Specification May 1996 + + + SI1 SI2 Data + ---------- ---------- ---- + 0x41 ('A') 0x70 ('P') Apollo file type information + + LEN gives the length of the subfield data, excluding the 4 + initial bytes. + + 2.3.1.2. Compliance + + A compliant compressor must produce files with correct ID1, + ID2, CM, CRC32, and ISIZE, but may set all the other fields in + the fixed-length part of the header to default values (255 for + OS, 0 for all others). The compressor must set all reserved + bits to zero. + + A compliant decompressor must check ID1, ID2, and CM, and + provide an error indication if any of these have incorrect + values. It must examine FEXTRA/XLEN, FNAME, FCOMMENT and FHCRC + at least so it can skip over the optional fields if they are + present. It need not examine any other part of the header or + trailer; in particular, a decompressor may ignore FTEXT and OS + and always produce binary output, and still be compliant. A + compliant decompressor must give an error indication if any + reserved bit is non-zero, since such a bit could indicate the + presence of a new field that would cause subsequent data to be + interpreted incorrectly. + +3. References + + [1] "Information Processing - 8-bit single-byte coded graphic + character sets - Part 1: Latin alphabet No.1" (ISO 8859-1:1987). + The ISO 8859-1 (Latin-1) character set is a superset of 7-bit + ASCII. Files defining this character set are available as + iso_8859-1.* in ftp://ftp.uu.net/graphics/png/documents/ + + [2] ISO 3309 + + [3] ITU-T recommendation V.42 + + [4] Deutsch, L.P.,"DEFLATE Compressed Data Format Specification", + available in ftp://ftp.uu.net/pub/archiving/zip/doc/ + + [5] Gailly, J.-L., GZIP documentation, available as gzip-*.tar in + ftp://prep.ai.mit.edu/pub/gnu/ + + [6] Sarwate, D.V., "Computation of Cyclic Redundancy Checks via Table + Look-Up", Communications of the ACM, 31(8), pp.1008-1013. + + + + +Deutsch Informational [Page 9] + +RFC 1952 GZIP File Format Specification May 1996 + + + [7] Schwaderer, W.D., "CRC Calculation", April 85 PC Tech Journal, + pp.118-133. + + [8] ftp://ftp.adelaide.edu.au/pub/rocksoft/papers/crc_v3.txt, + describing the CRC concept. + +4. Security Considerations + + Any data compression method involves the reduction of redundancy in + the data. Consequently, any corruption of the data is likely to have + severe effects and be difficult to correct. Uncompressed text, on + the other hand, will probably still be readable despite the presence + of some corrupted bytes. + + It is recommended that systems using this data format provide some + means of validating the integrity of the compressed data, such as by + setting and checking the CRC-32 check value. + +5. Acknowledgements + + Trademarks cited in this document are the property of their + respective owners. + + Jean-Loup Gailly designed the gzip format and wrote, with Mark Adler, + the related software described in this specification. Glenn + Randers-Pehrson converted this document to RFC and HTML format. + +6. Author's Address + + L. Peter Deutsch + Aladdin Enterprises + 203 Santa Margarita Ave. + Menlo Park, CA 94025 + + Phone: (415) 322-0103 (AM only) + FAX: (415) 322-1734 + EMail: + + Questions about the technical content of this specification can be + sent by email to: + + Jean-Loup Gailly and + Mark Adler + + Editorial comments on this specification can be sent by email to: + + L. Peter Deutsch and + Glenn Randers-Pehrson + + + +Deutsch Informational [Page 10] + +RFC 1952 GZIP File Format Specification May 1996 + + +7. Appendix: Jean-Loup Gailly's gzip utility + + The most widely used implementation of gzip compression, and the + original documentation on which this specification is based, were + created by Jean-Loup Gailly . Since this + implementation is a de facto standard, we mention some more of its + features here. Again, the material in this section is not part of + the specification per se, and implementations need not follow it to + be compliant. + + When compressing or decompressing a file, gzip preserves the + protection, ownership, and modification time attributes on the local + file system, since there is no provision for representing protection + attributes in the gzip file format itself. Since the file format + includes a modification time, the gzip decompressor provides a + command line switch that assigns the modification time from the file, + rather than the local modification time of the compressed input, to + the decompressed output. + +8. Appendix: Sample CRC Code + + The following sample code represents a practical implementation of + the CRC (Cyclic Redundancy Check). (See also ISO 3309 and ITU-T V.42 + for a formal specification.) + + The sample code is in the ANSI C programming language. Non C users + may find it easier to read with these hints: + + & Bitwise AND operator. + ^ Bitwise exclusive-OR operator. + >> Bitwise right shift operator. When applied to an + unsigned quantity, as here, right shift inserts zero + bit(s) at the left. + ! Logical NOT operator. + ++ "n++" increments the variable n. + 0xNNN 0x introduces a hexadecimal (base 16) constant. + Suffix L indicates a long value (at least 32 bits). + + /* Table of CRCs of all 8-bit messages. */ + unsigned long crc_table[256]; + + /* Flag: has the table been computed? Initially false. */ + int crc_table_computed = 0; + + /* Make the table for a fast CRC. */ + void make_crc_table(void) + { + unsigned long c; + + + +Deutsch Informational [Page 11] + +RFC 1952 GZIP File Format Specification May 1996 + + + int n, k; + for (n = 0; n < 256; n++) { + c = (unsigned long) n; + for (k = 0; k < 8; k++) { + if (c & 1) { + c = 0xedb88320L ^ (c >> 1); + } else { + c = c >> 1; + } + } + crc_table[n] = c; + } + crc_table_computed = 1; + } + + /* + Update a running crc with the bytes buf[0..len-1] and return + the updated crc. The crc should be initialized to zero. Pre- and + post-conditioning (one's complement) is performed within this + function so it shouldn't be done by the caller. Usage example: + + unsigned long crc = 0L; + + while (read_buffer(buffer, length) != EOF) { + crc = update_crc(crc, buffer, length); + } + if (crc != original_crc) error(); + */ + unsigned long update_crc(unsigned long crc, + unsigned char *buf, int len) + { + unsigned long c = crc ^ 0xffffffffL; + int n; + + if (!crc_table_computed) + make_crc_table(); + for (n = 0; n < len; n++) { + c = crc_table[(c ^ buf[n]) & 0xff] ^ (c >> 8); + } + return c ^ 0xffffffffL; + } + + /* Return the CRC of the bytes buf[0..len-1]. */ + unsigned long crc(unsigned char *buf, int len) + { + return update_crc(0L, buf, len); + } + + + + +Deutsch Informational [Page 12] + diff --git a/external/zlib/doc/txtvsbin.txt b/external/zlib/doc/txtvsbin.txt new file mode 100644 index 00000000..3d0f0634 --- /dev/null +++ b/external/zlib/doc/txtvsbin.txt @@ -0,0 +1,107 @@ +A Fast Method for Identifying Plain Text Files +============================================== + + +Introduction +------------ + +Given a file coming from an unknown source, it is sometimes desirable +to find out whether the format of that file is plain text. Although +this may appear like a simple task, a fully accurate detection of the +file type requires heavy-duty semantic analysis on the file contents. +It is, however, possible to obtain satisfactory results by employing +various heuristics. + +Previous versions of PKZip and other zip-compatible compression tools +were using a crude detection scheme: if more than 80% (4/5) of the bytes +found in a certain buffer are within the range [7..127], the file is +labeled as plain text, otherwise it is labeled as binary. A prominent +limitation of this scheme is the restriction to Latin-based alphabets. +Other alphabets, like Greek, Cyrillic or Asian, make extensive use of +the bytes within the range [128..255], and texts using these alphabets +are most often misidentified by this scheme; in other words, the rate +of false negatives is sometimes too high, which means that the recall +is low. Another weakness of this scheme is a reduced precision, due to +the false positives that may occur when binary files containing large +amounts of textual characters are misidentified as plain text. + +In this article we propose a new, simple detection scheme that features +a much increased precision and a near-100% recall. This scheme is +designed to work on ASCII, Unicode and other ASCII-derived alphabets, +and it handles single-byte encodings (ISO-8859, MacRoman, KOI8, etc.) +and variable-sized encodings (ISO-2022, UTF-8, etc.). Wider encodings +(UCS-2/UTF-16 and UCS-4/UTF-32) are not handled, however. + + +The Algorithm +------------- + +The algorithm works by dividing the set of bytecodes [0..255] into three +categories: +- The white list of textual bytecodes: + 9 (TAB), 10 (LF), 13 (CR), 32 (SPACE) to 255. +- The gray list of tolerated bytecodes: + 7 (BEL), 8 (BS), 11 (VT), 12 (FF), 26 (SUB), 27 (ESC). +- The black list of undesired, non-textual bytecodes: + 0 (NUL) to 6, 14 to 31. + +If a file contains at least one byte that belongs to the white list and +no byte that belongs to the black list, then the file is categorized as +plain text; otherwise, it is categorized as binary. (The boundary case, +when the file is empty, automatically falls into the latter category.) + + +Rationale +--------- + +The idea behind this algorithm relies on two observations. + +The first observation is that, although the full range of 7-bit codes +[0..127] is properly specified by the ASCII standard, most control +characters in the range [0..31] are not used in practice. The only +widely-used, almost universally-portable control codes are 9 (TAB), +10 (LF) and 13 (CR). There are a few more control codes that are +recognized on a reduced range of platforms and text viewers/editors: +7 (BEL), 8 (BS), 11 (VT), 12 (FF), 26 (SUB) and 27 (ESC); but these +codes are rarely (if ever) used alone, without being accompanied by +some printable text. Even the newer, portable text formats such as +XML avoid using control characters outside the list mentioned here. + +The second observation is that most of the binary files tend to contain +control characters, especially 0 (NUL). Even though the older text +detection schemes observe the presence of non-ASCII codes from the range +[128..255], the precision rarely has to suffer if this upper range is +labeled as textual, because the files that are genuinely binary tend to +contain both control characters and codes from the upper range. On the +other hand, the upper range needs to be labeled as textual, because it +is used by virtually all ASCII extensions. In particular, this range is +used for encoding non-Latin scripts. + +Since there is no counting involved, other than simply observing the +presence or the absence of some byte values, the algorithm produces +consistent results, regardless what alphabet encoding is being used. +(If counting were involved, it could be possible to obtain different +results on a text encoded, say, using ISO-8859-16 versus UTF-8.) + +There is an extra category of plain text files that are "polluted" with +one or more black-listed codes, either by mistake or by peculiar design +considerations. In such cases, a scheme that tolerates a small fraction +of black-listed codes would provide an increased recall (i.e. more true +positives). This, however, incurs a reduced precision overall, since +false positives are more likely to appear in binary files that contain +large chunks of textual data. Furthermore, "polluted" plain text should +be regarded as binary by general-purpose text detection schemes, because +general-purpose text processing algorithms might not be applicable. +Under this premise, it is safe to say that our detection method provides +a near-100% recall. + +Experiments have been run on many files coming from various platforms +and applications. We tried plain text files, system logs, source code, +formatted office documents, compiled object code, etc. The results +confirm the optimistic assumptions about the capabilities of this +algorithm. + + +-- +Cosmin Truta +Last updated: 2006-May-28 diff --git a/zlib/example.c b/external/zlib/example.c similarity index 100% rename from zlib/example.c rename to external/zlib/example.c diff --git a/external/zlib/examples/README.examples b/external/zlib/examples/README.examples new file mode 100644 index 00000000..56a31714 --- /dev/null +++ b/external/zlib/examples/README.examples @@ -0,0 +1,49 @@ +This directory contains examples of the use of zlib and other relevant +programs and documentation. + +enough.c + calculation and justification of ENOUGH parameter in inftrees.h + - calculates the maximum table space used in inflate tree + construction over all possible Huffman codes + +fitblk.c + compress just enough input to nearly fill a requested output size + - zlib isn't designed to do this, but fitblk does it anyway + +gun.c + uncompress a gzip file + - illustrates the use of inflateBack() for high speed file-to-file + decompression using call-back functions + - is approximately twice as fast as gzip -d + - also provides Unix uncompress functionality, again twice as fast + +gzappend.c + append to a gzip file + - illustrates the use of the Z_BLOCK flush parameter for inflate() + - illustrates the use of deflatePrime() to start at any bit + +gzjoin.c + join gzip files without recalculating the crc or recompressing + - illustrates the use of the Z_BLOCK flush parameter for inflate() + - illustrates the use of crc32_combine() + +gzlog.c +gzlog.h + efficiently and robustly maintain a message log file in gzip format + - illustrates use of raw deflate, Z_PARTIAL_FLUSH, deflatePrime(), + and deflateSetDictionary() + - illustrates use of a gzip header extra field + +zlib_how.html + painfully comprehensive description of zpipe.c (see below) + - describes in excruciating detail the use of deflate() and inflate() + +zpipe.c + reads and writes zlib streams from stdin to stdout + - illustrates the proper use of deflate() and inflate() + - deeply commented in zlib_how.html (see above) + +zran.c + index a zlib or gzip stream and randomly access it + - illustrates the use of Z_BLOCK, inflatePrime(), and + inflateSetDictionary() to provide random access diff --git a/external/zlib/examples/enough.c b/external/zlib/examples/enough.c new file mode 100644 index 00000000..b9911443 --- /dev/null +++ b/external/zlib/examples/enough.c @@ -0,0 +1,572 @@ +/* enough.c -- determine the maximum size of inflate's Huffman code tables over + * all possible valid and complete Huffman codes, subject to a length limit. + * Copyright (C) 2007, 2008, 2012 Mark Adler + * Version 1.4 18 August 2012 Mark Adler + */ + +/* Version history: + 1.0 3 Jan 2007 First version (derived from codecount.c version 1.4) + 1.1 4 Jan 2007 Use faster incremental table usage computation + Prune examine() search on previously visited states + 1.2 5 Jan 2007 Comments clean up + As inflate does, decrease root for short codes + Refuse cases where inflate would increase root + 1.3 17 Feb 2008 Add argument for initial root table size + Fix bug for initial root table size == max - 1 + Use a macro to compute the history index + 1.4 18 Aug 2012 Avoid shifts more than bits in type (caused endless loop!) + Clean up comparisons of different types + Clean up code indentation + */ + +/* + Examine all possible Huffman codes for a given number of symbols and a + maximum code length in bits to determine the maximum table size for zilb's + inflate. Only complete Huffman codes are counted. + + Two codes are considered distinct if the vectors of the number of codes per + length are not identical. So permutations of the symbol assignments result + in the same code for the counting, as do permutations of the assignments of + the bit values to the codes (i.e. only canonical codes are counted). + + We build a code from shorter to longer lengths, determining how many symbols + are coded at each length. At each step, we have how many symbols remain to + be coded, what the last code length used was, and how many bit patterns of + that length remain unused. Then we add one to the code length and double the + number of unused patterns to graduate to the next code length. We then + assign all portions of the remaining symbols to that code length that + preserve the properties of a correct and eventually complete code. Those + properties are: we cannot use more bit patterns than are available; and when + all the symbols are used, there are exactly zero possible bit patterns + remaining. + + The inflate Huffman decoding algorithm uses two-level lookup tables for + speed. There is a single first-level table to decode codes up to root bits + in length (root == 9 in the current inflate implementation). The table + has 1 << root entries and is indexed by the next root bits of input. Codes + shorter than root bits have replicated table entries, so that the correct + entry is pointed to regardless of the bits that follow the short code. If + the code is longer than root bits, then the table entry points to a second- + level table. The size of that table is determined by the longest code with + that root-bit prefix. If that longest code has length len, then the table + has size 1 << (len - root), to index the remaining bits in that set of + codes. Each subsequent root-bit prefix then has its own sub-table. The + total number of table entries required by the code is calculated + incrementally as the number of codes at each bit length is populated. When + all of the codes are shorter than root bits, then root is reduced to the + longest code length, resulting in a single, smaller, one-level table. + + The inflate algorithm also provides for small values of root (relative to + the log2 of the number of symbols), where the shortest code has more bits + than root. In that case, root is increased to the length of the shortest + code. This program, by design, does not handle that case, so it is verified + that the number of symbols is less than 2^(root + 1). + + In order to speed up the examination (by about ten orders of magnitude for + the default arguments), the intermediate states in the build-up of a code + are remembered and previously visited branches are pruned. The memory + required for this will increase rapidly with the total number of symbols and + the maximum code length in bits. However this is a very small price to pay + for the vast speedup. + + First, all of the possible Huffman codes are counted, and reachable + intermediate states are noted by a non-zero count in a saved-results array. + Second, the intermediate states that lead to (root + 1) bit or longer codes + are used to look at all sub-codes from those junctures for their inflate + memory usage. (The amount of memory used is not affected by the number of + codes of root bits or less in length.) Third, the visited states in the + construction of those sub-codes and the associated calculation of the table + size is recalled in order to avoid recalculating from the same juncture. + Beginning the code examination at (root + 1) bit codes, which is enabled by + identifying the reachable nodes, accounts for about six of the orders of + magnitude of improvement for the default arguments. About another four + orders of magnitude come from not revisiting previous states. Out of + approximately 2x10^16 possible Huffman codes, only about 2x10^6 sub-codes + need to be examined to cover all of the possible table memory usage cases + for the default arguments of 286 symbols limited to 15-bit codes. + + Note that an unsigned long long type is used for counting. It is quite easy + to exceed the capacity of an eight-byte integer with a large number of + symbols and a large maximum code length, so multiple-precision arithmetic + would need to replace the unsigned long long arithmetic in that case. This + program will abort if an overflow occurs. The big_t type identifies where + the counting takes place. + + An unsigned long long type is also used for calculating the number of + possible codes remaining at the maximum length. This limits the maximum + code length to the number of bits in a long long minus the number of bits + needed to represent the symbols in a flat code. The code_t type identifies + where the bit pattern counting takes place. + */ + +#include +#include +#include +#include + +#define local static + +/* special data types */ +typedef unsigned long long big_t; /* type for code counting */ +typedef unsigned long long code_t; /* type for bit pattern counting */ +struct tab { /* type for been here check */ + size_t len; /* length of bit vector in char's */ + char *vec; /* allocated bit vector */ +}; + +/* The array for saving results, num[], is indexed with this triplet: + + syms: number of symbols remaining to code + left: number of available bit patterns at length len + len: number of bits in the codes currently being assigned + + Those indices are constrained thusly when saving results: + + syms: 3..totsym (totsym == total symbols to code) + left: 2..syms - 1, but only the evens (so syms == 8 -> 2, 4, 6) + len: 1..max - 1 (max == maximum code length in bits) + + syms == 2 is not saved since that immediately leads to a single code. left + must be even, since it represents the number of available bit patterns at + the current length, which is double the number at the previous length. + left ends at syms-1 since left == syms immediately results in a single code. + (left > sym is not allowed since that would result in an incomplete code.) + len is less than max, since the code completes immediately when len == max. + + The offset into the array is calculated for the three indices with the + first one (syms) being outermost, and the last one (len) being innermost. + We build the array with length max-1 lists for the len index, with syms-3 + of those for each symbol. There are totsym-2 of those, with each one + varying in length as a function of sym. See the calculation of index in + count() for the index, and the calculation of size in main() for the size + of the array. + + For the deflate example of 286 symbols limited to 15-bit codes, the array + has 284,284 entries, taking up 2.17 MB for an 8-byte big_t. More than + half of the space allocated for saved results is actually used -- not all + possible triplets are reached in the generation of valid Huffman codes. + */ + +/* The array for tracking visited states, done[], is itself indexed identically + to the num[] array as described above for the (syms, left, len) triplet. + Each element in the array is further indexed by the (mem, rem) doublet, + where mem is the amount of inflate table space used so far, and rem is the + remaining unused entries in the current inflate sub-table. Each indexed + element is simply one bit indicating whether the state has been visited or + not. Since the ranges for mem and rem are not known a priori, each bit + vector is of a variable size, and grows as needed to accommodate the visited + states. mem and rem are used to calculate a single index in a triangular + array. Since the range of mem is expected in the default case to be about + ten times larger than the range of rem, the array is skewed to reduce the + memory usage, with eight times the range for mem than for rem. See the + calculations for offset and bit in beenhere() for the details. + + For the deflate example of 286 symbols limited to 15-bit codes, the bit + vectors grow to total approximately 21 MB, in addition to the 4.3 MB done[] + array itself. + */ + +/* Globals to avoid propagating constants or constant pointers recursively */ +local int max; /* maximum allowed bit length for the codes */ +local int root; /* size of base code table in bits */ +local int large; /* largest code table so far */ +local size_t size; /* number of elements in num and done */ +local int *code; /* number of symbols assigned to each bit length */ +local big_t *num; /* saved results array for code counting */ +local struct tab *done; /* states already evaluated array */ + +/* Index function for num[] and done[] */ +#define INDEX(i,j,k) (((size_t)((i-1)>>1)*((i-2)>>1)+(j>>1)-1)*(max-1)+k-1) + +/* Free allocated space. Uses globals code, num, and done. */ +local void cleanup(void) +{ + size_t n; + + if (done != NULL) { + for (n = 0; n < size; n++) + if (done[n].len) + free(done[n].vec); + free(done); + } + if (num != NULL) + free(num); + if (code != NULL) + free(code); +} + +/* Return the number of possible Huffman codes using bit patterns of lengths + len through max inclusive, coding syms symbols, with left bit patterns of + length len unused -- return -1 if there is an overflow in the counting. + Keep a record of previous results in num to prevent repeating the same + calculation. Uses the globals max and num. */ +local big_t count(int syms, int len, int left) +{ + big_t sum; /* number of possible codes from this juncture */ + big_t got; /* value returned from count() */ + int least; /* least number of syms to use at this juncture */ + int most; /* most number of syms to use at this juncture */ + int use; /* number of bit patterns to use in next call */ + size_t index; /* index of this case in *num */ + + /* see if only one possible code */ + if (syms == left) + return 1; + + /* note and verify the expected state */ + assert(syms > left && left > 0 && len < max); + + /* see if we've done this one already */ + index = INDEX(syms, left, len); + got = num[index]; + if (got) + return got; /* we have -- return the saved result */ + + /* we need to use at least this many bit patterns so that the code won't be + incomplete at the next length (more bit patterns than symbols) */ + least = (left << 1) - syms; + if (least < 0) + least = 0; + + /* we can use at most this many bit patterns, lest there not be enough + available for the remaining symbols at the maximum length (if there were + no limit to the code length, this would become: most = left - 1) */ + most = (((code_t)left << (max - len)) - syms) / + (((code_t)1 << (max - len)) - 1); + + /* count all possible codes from this juncture and add them up */ + sum = 0; + for (use = least; use <= most; use++) { + got = count(syms - use, len + 1, (left - use) << 1); + sum += got; + if (got == (big_t)0 - 1 || sum < got) /* overflow */ + return (big_t)0 - 1; + } + + /* verify that all recursive calls are productive */ + assert(sum != 0); + + /* save the result and return it */ + num[index] = sum; + return sum; +} + +/* Return true if we've been here before, set to true if not. Set a bit in a + bit vector to indicate visiting this state. Each (syms,len,left) state + has a variable size bit vector indexed by (mem,rem). The bit vector is + lengthened if needed to allow setting the (mem,rem) bit. */ +local int beenhere(int syms, int len, int left, int mem, int rem) +{ + size_t index; /* index for this state's bit vector */ + size_t offset; /* offset in this state's bit vector */ + int bit; /* mask for this state's bit */ + size_t length; /* length of the bit vector in bytes */ + char *vector; /* new or enlarged bit vector */ + + /* point to vector for (syms,left,len), bit in vector for (mem,rem) */ + index = INDEX(syms, left, len); + mem -= 1 << root; + offset = (mem >> 3) + rem; + offset = ((offset * (offset + 1)) >> 1) + rem; + bit = 1 << (mem & 7); + + /* see if we've been here */ + length = done[index].len; + if (offset < length && (done[index].vec[offset] & bit) != 0) + return 1; /* done this! */ + + /* we haven't been here before -- set the bit to show we have now */ + + /* see if we need to lengthen the vector in order to set the bit */ + if (length <= offset) { + /* if we have one already, enlarge it, zero out the appended space */ + if (length) { + do { + length <<= 1; + } while (length <= offset); + vector = realloc(done[index].vec, length); + if (vector != NULL) + memset(vector + done[index].len, 0, length - done[index].len); + } + + /* otherwise we need to make a new vector and zero it out */ + else { + length = 1 << (len - root); + while (length <= offset) + length <<= 1; + vector = calloc(length, sizeof(char)); + } + + /* in either case, bail if we can't get the memory */ + if (vector == NULL) { + fputs("abort: unable to allocate enough memory\n", stderr); + cleanup(); + exit(1); + } + + /* install the new vector */ + done[index].len = length; + done[index].vec = vector; + } + + /* set the bit */ + done[index].vec[offset] |= bit; + return 0; +} + +/* Examine all possible codes from the given node (syms, len, left). Compute + the amount of memory required to build inflate's decoding tables, where the + number of code structures used so far is mem, and the number remaining in + the current sub-table is rem. Uses the globals max, code, root, large, and + done. */ +local void examine(int syms, int len, int left, int mem, int rem) +{ + int least; /* least number of syms to use at this juncture */ + int most; /* most number of syms to use at this juncture */ + int use; /* number of bit patterns to use in next call */ + + /* see if we have a complete code */ + if (syms == left) { + /* set the last code entry */ + code[len] = left; + + /* complete computation of memory used by this code */ + while (rem < left) { + left -= rem; + rem = 1 << (len - root); + mem += rem; + } + assert(rem == left); + + /* if this is a new maximum, show the entries used and the sub-code */ + if (mem > large) { + large = mem; + printf("max %d: ", mem); + for (use = root + 1; use <= max; use++) + if (code[use]) + printf("%d[%d] ", code[use], use); + putchar('\n'); + fflush(stdout); + } + + /* remove entries as we drop back down in the recursion */ + code[len] = 0; + return; + } + + /* prune the tree if we can */ + if (beenhere(syms, len, left, mem, rem)) + return; + + /* we need to use at least this many bit patterns so that the code won't be + incomplete at the next length (more bit patterns than symbols) */ + least = (left << 1) - syms; + if (least < 0) + least = 0; + + /* we can use at most this many bit patterns, lest there not be enough + available for the remaining symbols at the maximum length (if there were + no limit to the code length, this would become: most = left - 1) */ + most = (((code_t)left << (max - len)) - syms) / + (((code_t)1 << (max - len)) - 1); + + /* occupy least table spaces, creating new sub-tables as needed */ + use = least; + while (rem < use) { + use -= rem; + rem = 1 << (len - root); + mem += rem; + } + rem -= use; + + /* examine codes from here, updating table space as we go */ + for (use = least; use <= most; use++) { + code[len] = use; + examine(syms - use, len + 1, (left - use) << 1, + mem + (rem ? 1 << (len - root) : 0), rem << 1); + if (rem == 0) { + rem = 1 << (len - root); + mem += rem; + } + rem--; + } + + /* remove entries as we drop back down in the recursion */ + code[len] = 0; +} + +/* Look at all sub-codes starting with root + 1 bits. Look at only the valid + intermediate code states (syms, left, len). For each completed code, + calculate the amount of memory required by inflate to build the decoding + tables. Find the maximum amount of memory required and show the code that + requires that maximum. Uses the globals max, root, and num. */ +local void enough(int syms) +{ + int n; /* number of remaing symbols for this node */ + int left; /* number of unused bit patterns at this length */ + size_t index; /* index of this case in *num */ + + /* clear code */ + for (n = 0; n <= max; n++) + code[n] = 0; + + /* look at all (root + 1) bit and longer codes */ + large = 1 << root; /* base table */ + if (root < max) /* otherwise, there's only a base table */ + for (n = 3; n <= syms; n++) + for (left = 2; left < n; left += 2) + { + /* look at all reachable (root + 1) bit nodes, and the + resulting codes (complete at root + 2 or more) */ + index = INDEX(n, left, root + 1); + if (root + 1 < max && num[index]) /* reachable node */ + examine(n, root + 1, left, 1 << root, 0); + + /* also look at root bit codes with completions at root + 1 + bits (not saved in num, since complete), just in case */ + if (num[index - 1] && n <= left << 1) + examine((n - left) << 1, root + 1, (n - left) << 1, + 1 << root, 0); + } + + /* done */ + printf("done: maximum of %d table entries\n", large); +} + +/* + Examine and show the total number of possible Huffman codes for a given + maximum number of symbols, initial root table size, and maximum code length + in bits -- those are the command arguments in that order. The default + values are 286, 9, and 15 respectively, for the deflate literal/length code. + The possible codes are counted for each number of coded symbols from two to + the maximum. The counts for each of those and the total number of codes are + shown. The maximum number of inflate table entires is then calculated + across all possible codes. Each new maximum number of table entries and the + associated sub-code (starting at root + 1 == 10 bits) is shown. + + To count and examine Huffman codes that are not length-limited, provide a + maximum length equal to the number of symbols minus one. + + For the deflate literal/length code, use "enough". For the deflate distance + code, use "enough 30 6". + + This uses the %llu printf format to print big_t numbers, which assumes that + big_t is an unsigned long long. If the big_t type is changed (for example + to a multiple precision type), the method of printing will also need to be + updated. + */ +int main(int argc, char **argv) +{ + int syms; /* total number of symbols to code */ + int n; /* number of symbols to code for this run */ + big_t got; /* return value of count() */ + big_t sum; /* accumulated number of codes over n */ + code_t word; /* for counting bits in code_t */ + + /* set up globals for cleanup() */ + code = NULL; + num = NULL; + done = NULL; + + /* get arguments -- default to the deflate literal/length code */ + syms = 286; + root = 9; + max = 15; + if (argc > 1) { + syms = atoi(argv[1]); + if (argc > 2) { + root = atoi(argv[2]); + if (argc > 3) + max = atoi(argv[3]); + } + } + if (argc > 4 || syms < 2 || root < 1 || max < 1) { + fputs("invalid arguments, need: [sym >= 2 [root >= 1 [max >= 1]]]\n", + stderr); + return 1; + } + + /* if not restricting the code length, the longest is syms - 1 */ + if (max > syms - 1) + max = syms - 1; + + /* determine the number of bits in a code_t */ + for (n = 0, word = 1; word; n++, word <<= 1) + ; + + /* make sure that the calculation of most will not overflow */ + if (max > n || (code_t)(syms - 2) >= (((code_t)0 - 1) >> (max - 1))) { + fputs("abort: code length too long for internal types\n", stderr); + return 1; + } + + /* reject impossible code requests */ + if ((code_t)(syms - 1) > ((code_t)1 << max) - 1) { + fprintf(stderr, "%d symbols cannot be coded in %d bits\n", + syms, max); + return 1; + } + + /* allocate code vector */ + code = calloc(max + 1, sizeof(int)); + if (code == NULL) { + fputs("abort: unable to allocate enough memory\n", stderr); + return 1; + } + + /* determine size of saved results array, checking for overflows, + allocate and clear the array (set all to zero with calloc()) */ + if (syms == 2) /* iff max == 1 */ + num = NULL; /* won't be saving any results */ + else { + size = syms >> 1; + if (size > ((size_t)0 - 1) / (n = (syms - 1) >> 1) || + (size *= n, size > ((size_t)0 - 1) / (n = max - 1)) || + (size *= n, size > ((size_t)0 - 1) / sizeof(big_t)) || + (num = calloc(size, sizeof(big_t))) == NULL) { + fputs("abort: unable to allocate enough memory\n", stderr); + cleanup(); + return 1; + } + } + + /* count possible codes for all numbers of symbols, add up counts */ + sum = 0; + for (n = 2; n <= syms; n++) { + got = count(n, 1, 2); + sum += got; + if (got == (big_t)0 - 1 || sum < got) { /* overflow */ + fputs("abort: can't count that high!\n", stderr); + cleanup(); + return 1; + } + printf("%llu %d-codes\n", got, n); + } + printf("%llu total codes for 2 to %d symbols", sum, syms); + if (max < syms - 1) + printf(" (%d-bit length limit)\n", max); + else + puts(" (no length limit)"); + + /* allocate and clear done array for beenhere() */ + if (syms == 2) + done = NULL; + else if (size > ((size_t)0 - 1) / sizeof(struct tab) || + (done = calloc(size, sizeof(struct tab))) == NULL) { + fputs("abort: unable to allocate enough memory\n", stderr); + cleanup(); + return 1; + } + + /* find and show maximum inflate table usage */ + if (root > max) /* reduce root to max length */ + root = max; + if ((code_t)syms < ((code_t)1 << (root + 1))) + enough(syms); + else + puts("cannot handle minimum code lengths > root"); + + /* done */ + cleanup(); + return 0; +} diff --git a/external/zlib/examples/fitblk.c b/external/zlib/examples/fitblk.c new file mode 100644 index 00000000..c61de5c9 --- /dev/null +++ b/external/zlib/examples/fitblk.c @@ -0,0 +1,233 @@ +/* fitblk.c: example of fitting compressed output to a specified size + Not copyrighted -- provided to the public domain + Version 1.1 25 November 2004 Mark Adler */ + +/* Version history: + 1.0 24 Nov 2004 First version + 1.1 25 Nov 2004 Change deflateInit2() to deflateInit() + Use fixed-size, stack-allocated raw buffers + Simplify code moving compression to subroutines + Use assert() for internal errors + Add detailed description of approach + */ + +/* Approach to just fitting a requested compressed size: + + fitblk performs three compression passes on a portion of the input + data in order to determine how much of that input will compress to + nearly the requested output block size. The first pass generates + enough deflate blocks to produce output to fill the requested + output size plus a specfied excess amount (see the EXCESS define + below). The last deflate block may go quite a bit past that, but + is discarded. The second pass decompresses and recompresses just + the compressed data that fit in the requested plus excess sized + buffer. The deflate process is terminated after that amount of + input, which is less than the amount consumed on the first pass. + The last deflate block of the result will be of a comparable size + to the final product, so that the header for that deflate block and + the compression ratio for that block will be about the same as in + the final product. The third compression pass decompresses the + result of the second step, but only the compressed data up to the + requested size minus an amount to allow the compressed stream to + complete (see the MARGIN define below). That will result in a + final compressed stream whose length is less than or equal to the + requested size. Assuming sufficient input and a requested size + greater than a few hundred bytes, the shortfall will typically be + less than ten bytes. + + If the input is short enough that the first compression completes + before filling the requested output size, then that compressed + stream is return with no recompression. + + EXCESS is chosen to be just greater than the shortfall seen in a + two pass approach similar to the above. That shortfall is due to + the last deflate block compressing more efficiently with a smaller + header on the second pass. EXCESS is set to be large enough so + that there is enough uncompressed data for the second pass to fill + out the requested size, and small enough so that the final deflate + block of the second pass will be close in size to the final deflate + block of the third and final pass. MARGIN is chosen to be just + large enough to assure that the final compression has enough room + to complete in all cases. + */ + +#include +#include +#include +#include "zlib.h" + +#define local static + +/* print nastygram and leave */ +local void quit(char *why) +{ + fprintf(stderr, "fitblk abort: %s\n", why); + exit(1); +} + +#define RAWLEN 4096 /* intermediate uncompressed buffer size */ + +/* compress from file to def until provided buffer is full or end of + input reached; return last deflate() return value, or Z_ERRNO if + there was read error on the file */ +local int partcompress(FILE *in, z_streamp def) +{ + int ret, flush; + unsigned char raw[RAWLEN]; + + flush = Z_NO_FLUSH; + do { + def->avail_in = fread(raw, 1, RAWLEN, in); + if (ferror(in)) + return Z_ERRNO; + def->next_in = raw; + if (feof(in)) + flush = Z_FINISH; + ret = deflate(def, flush); + assert(ret != Z_STREAM_ERROR); + } while (def->avail_out != 0 && flush == Z_NO_FLUSH); + return ret; +} + +/* recompress from inf's input to def's output; the input for inf and + the output for def are set in those structures before calling; + return last deflate() return value, or Z_MEM_ERROR if inflate() + was not able to allocate enough memory when it needed to */ +local int recompress(z_streamp inf, z_streamp def) +{ + int ret, flush; + unsigned char raw[RAWLEN]; + + flush = Z_NO_FLUSH; + do { + /* decompress */ + inf->avail_out = RAWLEN; + inf->next_out = raw; + ret = inflate(inf, Z_NO_FLUSH); + assert(ret != Z_STREAM_ERROR && ret != Z_DATA_ERROR && + ret != Z_NEED_DICT); + if (ret == Z_MEM_ERROR) + return ret; + + /* compress what was decompresed until done or no room */ + def->avail_in = RAWLEN - inf->avail_out; + def->next_in = raw; + if (inf->avail_out != 0) + flush = Z_FINISH; + ret = deflate(def, flush); + assert(ret != Z_STREAM_ERROR); + } while (ret != Z_STREAM_END && def->avail_out != 0); + return ret; +} + +#define EXCESS 256 /* empirically determined stream overage */ +#define MARGIN 8 /* amount to back off for completion */ + +/* compress from stdin to fixed-size block on stdout */ +int main(int argc, char **argv) +{ + int ret; /* return code */ + unsigned size; /* requested fixed output block size */ + unsigned have; /* bytes written by deflate() call */ + unsigned char *blk; /* intermediate and final stream */ + unsigned char *tmp; /* close to desired size stream */ + z_stream def, inf; /* zlib deflate and inflate states */ + + /* get requested output size */ + if (argc != 2) + quit("need one argument: size of output block"); + ret = strtol(argv[1], argv + 1, 10); + if (argv[1][0] != 0) + quit("argument must be a number"); + if (ret < 8) /* 8 is minimum zlib stream size */ + quit("need positive size of 8 or greater"); + size = (unsigned)ret; + + /* allocate memory for buffers and compression engine */ + blk = malloc(size + EXCESS); + def.zalloc = Z_NULL; + def.zfree = Z_NULL; + def.opaque = Z_NULL; + ret = deflateInit(&def, Z_DEFAULT_COMPRESSION); + if (ret != Z_OK || blk == NULL) + quit("out of memory"); + + /* compress from stdin until output full, or no more input */ + def.avail_out = size + EXCESS; + def.next_out = blk; + ret = partcompress(stdin, &def); + if (ret == Z_ERRNO) + quit("error reading input"); + + /* if it all fit, then size was undersubscribed -- done! */ + if (ret == Z_STREAM_END && def.avail_out >= EXCESS) { + /* write block to stdout */ + have = size + EXCESS - def.avail_out; + if (fwrite(blk, 1, have, stdout) != have || ferror(stdout)) + quit("error writing output"); + + /* clean up and print results to stderr */ + ret = deflateEnd(&def); + assert(ret != Z_STREAM_ERROR); + free(blk); + fprintf(stderr, + "%u bytes unused out of %u requested (all input)\n", + size - have, size); + return 0; + } + + /* it didn't all fit -- set up for recompression */ + inf.zalloc = Z_NULL; + inf.zfree = Z_NULL; + inf.opaque = Z_NULL; + inf.avail_in = 0; + inf.next_in = Z_NULL; + ret = inflateInit(&inf); + tmp = malloc(size + EXCESS); + if (ret != Z_OK || tmp == NULL) + quit("out of memory"); + ret = deflateReset(&def); + assert(ret != Z_STREAM_ERROR); + + /* do first recompression close to the right amount */ + inf.avail_in = size + EXCESS; + inf.next_in = blk; + def.avail_out = size + EXCESS; + def.next_out = tmp; + ret = recompress(&inf, &def); + if (ret == Z_MEM_ERROR) + quit("out of memory"); + + /* set up for next reocmpression */ + ret = inflateReset(&inf); + assert(ret != Z_STREAM_ERROR); + ret = deflateReset(&def); + assert(ret != Z_STREAM_ERROR); + + /* do second and final recompression (third compression) */ + inf.avail_in = size - MARGIN; /* assure stream will complete */ + inf.next_in = tmp; + def.avail_out = size; + def.next_out = blk; + ret = recompress(&inf, &def); + if (ret == Z_MEM_ERROR) + quit("out of memory"); + assert(ret == Z_STREAM_END); /* otherwise MARGIN too small */ + + /* done -- write block to stdout */ + have = size - def.avail_out; + if (fwrite(blk, 1, have, stdout) != have || ferror(stdout)) + quit("error writing output"); + + /* clean up and print results to stderr */ + free(tmp); + ret = inflateEnd(&inf); + assert(ret != Z_STREAM_ERROR); + ret = deflateEnd(&def); + assert(ret != Z_STREAM_ERROR); + free(blk); + fprintf(stderr, + "%u bytes unused out of %u requested (%lu input)\n", + size - have, size, def.total_in); + return 0; +} diff --git a/external/zlib/examples/gun.c b/external/zlib/examples/gun.c new file mode 100644 index 00000000..89e484fe --- /dev/null +++ b/external/zlib/examples/gun.c @@ -0,0 +1,702 @@ +/* gun.c -- simple gunzip to give an example of the use of inflateBack() + * Copyright (C) 2003, 2005, 2008, 2010, 2012 Mark Adler + * For conditions of distribution and use, see copyright notice in zlib.h + Version 1.7 12 August 2012 Mark Adler */ + +/* Version history: + 1.0 16 Feb 2003 First version for testing of inflateBack() + 1.1 21 Feb 2005 Decompress concatenated gzip streams + Remove use of "this" variable (C++ keyword) + Fix return value for in() + Improve allocation failure checking + Add typecasting for void * structures + Add -h option for command version and usage + Add a bunch of comments + 1.2 20 Mar 2005 Add Unix compress (LZW) decompression + Copy file attributes from input file to output file + 1.3 12 Jun 2005 Add casts for error messages [Oberhumer] + 1.4 8 Dec 2006 LZW decompression speed improvements + 1.5 9 Feb 2008 Avoid warning in latest version of gcc + 1.6 17 Jan 2010 Avoid signed/unsigned comparison warnings + 1.7 12 Aug 2012 Update for z_const usage in zlib 1.2.8 + */ + +/* + gun [ -t ] [ name ... ] + + decompresses the data in the named gzip files. If no arguments are given, + gun will decompress from stdin to stdout. The names must end in .gz, -gz, + .z, -z, _z, or .Z. The uncompressed data will be written to a file name + with the suffix stripped. On success, the original file is deleted. On + failure, the output file is deleted. For most failures, the command will + continue to process the remaining names on the command line. A memory + allocation failure will abort the command. If -t is specified, then the + listed files or stdin will be tested as gzip files for integrity (without + checking for a proper suffix), no output will be written, and no files + will be deleted. + + Like gzip, gun allows concatenated gzip streams and will decompress them, + writing all of the uncompressed data to the output. Unlike gzip, gun allows + an empty file on input, and will produce no error writing an empty output + file. + + gun will also decompress files made by Unix compress, which uses LZW + compression. These files are automatically detected by virtue of their + magic header bytes. Since the end of Unix compress stream is marked by the + end-of-file, they cannot be concantenated. If a Unix compress stream is + encountered in an input file, it is the last stream in that file. + + Like gunzip and uncompress, the file attributes of the orignal compressed + file are maintained in the final uncompressed file, to the extent that the + user permissions allow it. + + On my Mac OS X PowerPC G4, gun is almost twice as fast as gunzip (version + 1.2.4) is on the same file, when gun is linked with zlib 1.2.2. Also the + LZW decompression provided by gun is about twice as fast as the standard + Unix uncompress command. + */ + +/* external functions and related types and constants */ +#include /* fprintf() */ +#include /* malloc(), free() */ +#include /* strerror(), strcmp(), strlen(), memcpy() */ +#include /* errno */ +#include /* open() */ +#include /* read(), write(), close(), chown(), unlink() */ +#include +#include /* stat(), chmod() */ +#include /* utime() */ +#include "zlib.h" /* inflateBackInit(), inflateBack(), */ + /* inflateBackEnd(), crc32() */ + +/* function declaration */ +#define local static + +/* buffer constants */ +#define SIZE 32768U /* input and output buffer sizes */ +#define PIECE 16384 /* limits i/o chunks for 16-bit int case */ + +/* structure for infback() to pass to input function in() -- it maintains the + input file and a buffer of size SIZE */ +struct ind { + int infile; + unsigned char *inbuf; +}; + +/* Load input buffer, assumed to be empty, and return bytes loaded and a + pointer to them. read() is called until the buffer is full, or until it + returns end-of-file or error. Return 0 on error. */ +local unsigned in(void *in_desc, z_const unsigned char **buf) +{ + int ret; + unsigned len; + unsigned char *next; + struct ind *me = (struct ind *)in_desc; + + next = me->inbuf; + *buf = next; + len = 0; + do { + ret = PIECE; + if ((unsigned)ret > SIZE - len) + ret = (int)(SIZE - len); + ret = (int)read(me->infile, next, ret); + if (ret == -1) { + len = 0; + break; + } + next += ret; + len += ret; + } while (ret != 0 && len < SIZE); + return len; +} + +/* structure for infback() to pass to output function out() -- it maintains the + output file, a running CRC-32 check on the output and the total number of + bytes output, both for checking against the gzip trailer. (The length in + the gzip trailer is stored modulo 2^32, so it's ok if a long is 32 bits and + the output is greater than 4 GB.) */ +struct outd { + int outfile; + int check; /* true if checking crc and total */ + unsigned long crc; + unsigned long total; +}; + +/* Write output buffer and update the CRC-32 and total bytes written. write() + is called until all of the output is written or an error is encountered. + On success out() returns 0. For a write failure, out() returns 1. If the + output file descriptor is -1, then nothing is written. + */ +local int out(void *out_desc, unsigned char *buf, unsigned len) +{ + int ret; + struct outd *me = (struct outd *)out_desc; + + if (me->check) { + me->crc = crc32(me->crc, buf, len); + me->total += len; + } + if (me->outfile != -1) + do { + ret = PIECE; + if ((unsigned)ret > len) + ret = (int)len; + ret = (int)write(me->outfile, buf, ret); + if (ret == -1) + return 1; + buf += ret; + len -= ret; + } while (len != 0); + return 0; +} + +/* next input byte macro for use inside lunpipe() and gunpipe() */ +#define NEXT() (have ? 0 : (have = in(indp, &next)), \ + last = have ? (have--, (int)(*next++)) : -1) + +/* memory for gunpipe() and lunpipe() -- + the first 256 entries of prefix[] and suffix[] are never used, could + have offset the index, but it's faster to waste the memory */ +unsigned char inbuf[SIZE]; /* input buffer */ +unsigned char outbuf[SIZE]; /* output buffer */ +unsigned short prefix[65536]; /* index to LZW prefix string */ +unsigned char suffix[65536]; /* one-character LZW suffix */ +unsigned char match[65280 + 2]; /* buffer for reversed match or gzip + 32K sliding window */ + +/* throw out what's left in the current bits byte buffer (this is a vestigial + aspect of the compressed data format derived from an implementation that + made use of a special VAX machine instruction!) */ +#define FLUSHCODE() \ + do { \ + left = 0; \ + rem = 0; \ + if (chunk > have) { \ + chunk -= have; \ + have = 0; \ + if (NEXT() == -1) \ + break; \ + chunk--; \ + if (chunk > have) { \ + chunk = have = 0; \ + break; \ + } \ + } \ + have -= chunk; \ + next += chunk; \ + chunk = 0; \ + } while (0) + +/* Decompress a compress (LZW) file from indp to outfile. The compress magic + header (two bytes) has already been read and verified. There are have bytes + of buffered input at next. strm is used for passing error information back + to gunpipe(). + + lunpipe() will return Z_OK on success, Z_BUF_ERROR for an unexpected end of + file, read error, or write error (a write error indicated by strm->next_in + not equal to Z_NULL), or Z_DATA_ERROR for invalid input. + */ +local int lunpipe(unsigned have, z_const unsigned char *next, struct ind *indp, + int outfile, z_stream *strm) +{ + int last; /* last byte read by NEXT(), or -1 if EOF */ + unsigned chunk; /* bytes left in current chunk */ + int left; /* bits left in rem */ + unsigned rem; /* unused bits from input */ + int bits; /* current bits per code */ + unsigned code; /* code, table traversal index */ + unsigned mask; /* mask for current bits codes */ + int max; /* maximum bits per code for this stream */ + unsigned flags; /* compress flags, then block compress flag */ + unsigned end; /* last valid entry in prefix/suffix tables */ + unsigned temp; /* current code */ + unsigned prev; /* previous code */ + unsigned final; /* last character written for previous code */ + unsigned stack; /* next position for reversed string */ + unsigned outcnt; /* bytes in output buffer */ + struct outd outd; /* output structure */ + unsigned char *p; + + /* set up output */ + outd.outfile = outfile; + outd.check = 0; + + /* process remainder of compress header -- a flags byte */ + flags = NEXT(); + if (last == -1) + return Z_BUF_ERROR; + if (flags & 0x60) { + strm->msg = (char *)"unknown lzw flags set"; + return Z_DATA_ERROR; + } + max = flags & 0x1f; + if (max < 9 || max > 16) { + strm->msg = (char *)"lzw bits out of range"; + return Z_DATA_ERROR; + } + if (max == 9) /* 9 doesn't really mean 9 */ + max = 10; + flags &= 0x80; /* true if block compress */ + + /* clear table */ + bits = 9; + mask = 0x1ff; + end = flags ? 256 : 255; + + /* set up: get first 9-bit code, which is the first decompressed byte, but + don't create a table entry until the next code */ + if (NEXT() == -1) /* no compressed data is ok */ + return Z_OK; + final = prev = (unsigned)last; /* low 8 bits of code */ + if (NEXT() == -1) /* missing a bit */ + return Z_BUF_ERROR; + if (last & 1) { /* code must be < 256 */ + strm->msg = (char *)"invalid lzw code"; + return Z_DATA_ERROR; + } + rem = (unsigned)last >> 1; /* remaining 7 bits */ + left = 7; + chunk = bits - 2; /* 7 bytes left in this chunk */ + outbuf[0] = (unsigned char)final; /* write first decompressed byte */ + outcnt = 1; + + /* decode codes */ + stack = 0; + for (;;) { + /* if the table will be full after this, increment the code size */ + if (end >= mask && bits < max) { + FLUSHCODE(); + bits++; + mask <<= 1; + mask++; + } + + /* get a code of length bits */ + if (chunk == 0) /* decrement chunk modulo bits */ + chunk = bits; + code = rem; /* low bits of code */ + if (NEXT() == -1) { /* EOF is end of compressed data */ + /* write remaining buffered output */ + if (outcnt && out(&outd, outbuf, outcnt)) { + strm->next_in = outbuf; /* signal write error */ + return Z_BUF_ERROR; + } + return Z_OK; + } + code += (unsigned)last << left; /* middle (or high) bits of code */ + left += 8; + chunk--; + if (bits > left) { /* need more bits */ + if (NEXT() == -1) /* can't end in middle of code */ + return Z_BUF_ERROR; + code += (unsigned)last << left; /* high bits of code */ + left += 8; + chunk--; + } + code &= mask; /* mask to current code length */ + left -= bits; /* number of unused bits */ + rem = (unsigned)last >> (8 - left); /* unused bits from last byte */ + + /* process clear code (256) */ + if (code == 256 && flags) { + FLUSHCODE(); + bits = 9; /* initialize bits and mask */ + mask = 0x1ff; + end = 255; /* empty table */ + continue; /* get next code */ + } + + /* special code to reuse last match */ + temp = code; /* save the current code */ + if (code > end) { + /* Be picky on the allowed code here, and make sure that the code + we drop through (prev) will be a valid index so that random + input does not cause an exception. The code != end + 1 check is + empirically derived, and not checked in the original uncompress + code. If this ever causes a problem, that check could be safely + removed. Leaving this check in greatly improves gun's ability + to detect random or corrupted input after a compress header. + In any case, the prev > end check must be retained. */ + if (code != end + 1 || prev > end) { + strm->msg = (char *)"invalid lzw code"; + return Z_DATA_ERROR; + } + match[stack++] = (unsigned char)final; + code = prev; + } + + /* walk through linked list to generate output in reverse order */ + p = match + stack; + while (code >= 256) { + *p++ = suffix[code]; + code = prefix[code]; + } + stack = p - match; + match[stack++] = (unsigned char)code; + final = code; + + /* link new table entry */ + if (end < mask) { + end++; + prefix[end] = (unsigned short)prev; + suffix[end] = (unsigned char)final; + } + + /* set previous code for next iteration */ + prev = temp; + + /* write output in forward order */ + while (stack > SIZE - outcnt) { + while (outcnt < SIZE) + outbuf[outcnt++] = match[--stack]; + if (out(&outd, outbuf, outcnt)) { + strm->next_in = outbuf; /* signal write error */ + return Z_BUF_ERROR; + } + outcnt = 0; + } + p = match + stack; + do { + outbuf[outcnt++] = *--p; + } while (p > match); + stack = 0; + + /* loop for next code with final and prev as the last match, rem and + left provide the first 0..7 bits of the next code, end is the last + valid table entry */ + } +} + +/* Decompress a gzip file from infile to outfile. strm is assumed to have been + successfully initialized with inflateBackInit(). The input file may consist + of a series of gzip streams, in which case all of them will be decompressed + to the output file. If outfile is -1, then the gzip stream(s) integrity is + checked and nothing is written. + + The return value is a zlib error code: Z_MEM_ERROR if out of memory, + Z_DATA_ERROR if the header or the compressed data is invalid, or if the + trailer CRC-32 check or length doesn't match, Z_BUF_ERROR if the input ends + prematurely or a write error occurs, or Z_ERRNO if junk (not a another gzip + stream) follows a valid gzip stream. + */ +local int gunpipe(z_stream *strm, int infile, int outfile) +{ + int ret, first, last; + unsigned have, flags, len; + z_const unsigned char *next = NULL; + struct ind ind, *indp; + struct outd outd; + + /* setup input buffer */ + ind.infile = infile; + ind.inbuf = inbuf; + indp = &ind; + + /* decompress concatenated gzip streams */ + have = 0; /* no input data read in yet */ + first = 1; /* looking for first gzip header */ + strm->next_in = Z_NULL; /* so Z_BUF_ERROR means EOF */ + for (;;) { + /* look for the two magic header bytes for a gzip stream */ + if (NEXT() == -1) { + ret = Z_OK; + break; /* empty gzip stream is ok */ + } + if (last != 31 || (NEXT() != 139 && last != 157)) { + strm->msg = (char *)"incorrect header check"; + ret = first ? Z_DATA_ERROR : Z_ERRNO; + break; /* not a gzip or compress header */ + } + first = 0; /* next non-header is junk */ + + /* process a compress (LZW) file -- can't be concatenated after this */ + if (last == 157) { + ret = lunpipe(have, next, indp, outfile, strm); + break; + } + + /* process remainder of gzip header */ + ret = Z_BUF_ERROR; + if (NEXT() != 8) { /* only deflate method allowed */ + if (last == -1) break; + strm->msg = (char *)"unknown compression method"; + ret = Z_DATA_ERROR; + break; + } + flags = NEXT(); /* header flags */ + NEXT(); /* discard mod time, xflgs, os */ + NEXT(); + NEXT(); + NEXT(); + NEXT(); + NEXT(); + if (last == -1) break; + if (flags & 0xe0) { + strm->msg = (char *)"unknown header flags set"; + ret = Z_DATA_ERROR; + break; + } + if (flags & 4) { /* extra field */ + len = NEXT(); + len += (unsigned)(NEXT()) << 8; + if (last == -1) break; + while (len > have) { + len -= have; + have = 0; + if (NEXT() == -1) break; + len--; + } + if (last == -1) break; + have -= len; + next += len; + } + if (flags & 8) /* file name */ + while (NEXT() != 0 && last != -1) + ; + if (flags & 16) /* comment */ + while (NEXT() != 0 && last != -1) + ; + if (flags & 2) { /* header crc */ + NEXT(); + NEXT(); + } + if (last == -1) break; + + /* set up output */ + outd.outfile = outfile; + outd.check = 1; + outd.crc = crc32(0L, Z_NULL, 0); + outd.total = 0; + + /* decompress data to output */ + strm->next_in = next; + strm->avail_in = have; + ret = inflateBack(strm, in, indp, out, &outd); + if (ret != Z_STREAM_END) break; + next = strm->next_in; + have = strm->avail_in; + strm->next_in = Z_NULL; /* so Z_BUF_ERROR means EOF */ + + /* check trailer */ + ret = Z_BUF_ERROR; + if (NEXT() != (int)(outd.crc & 0xff) || + NEXT() != (int)((outd.crc >> 8) & 0xff) || + NEXT() != (int)((outd.crc >> 16) & 0xff) || + NEXT() != (int)((outd.crc >> 24) & 0xff)) { + /* crc error */ + if (last != -1) { + strm->msg = (char *)"incorrect data check"; + ret = Z_DATA_ERROR; + } + break; + } + if (NEXT() != (int)(outd.total & 0xff) || + NEXT() != (int)((outd.total >> 8) & 0xff) || + NEXT() != (int)((outd.total >> 16) & 0xff) || + NEXT() != (int)((outd.total >> 24) & 0xff)) { + /* length error */ + if (last != -1) { + strm->msg = (char *)"incorrect length check"; + ret = Z_DATA_ERROR; + } + break; + } + + /* go back and look for another gzip stream */ + } + + /* clean up and return */ + return ret; +} + +/* Copy file attributes, from -> to, as best we can. This is best effort, so + no errors are reported. The mode bits, including suid, sgid, and the sticky + bit are copied (if allowed), the owner's user id and group id are copied + (again if allowed), and the access and modify times are copied. */ +local void copymeta(char *from, char *to) +{ + struct stat was; + struct utimbuf when; + + /* get all of from's Unix meta data, return if not a regular file */ + if (stat(from, &was) != 0 || (was.st_mode & S_IFMT) != S_IFREG) + return; + + /* set to's mode bits, ignore errors */ + (void)chmod(to, was.st_mode & 07777); + + /* copy owner's user and group, ignore errors */ + (void)chown(to, was.st_uid, was.st_gid); + + /* copy access and modify times, ignore errors */ + when.actime = was.st_atime; + when.modtime = was.st_mtime; + (void)utime(to, &when); +} + +/* Decompress the file inname to the file outnname, of if test is true, just + decompress without writing and check the gzip trailer for integrity. If + inname is NULL or an empty string, read from stdin. If outname is NULL or + an empty string, write to stdout. strm is a pre-initialized inflateBack + structure. When appropriate, copy the file attributes from inname to + outname. + + gunzip() returns 1 if there is an out-of-memory error or an unexpected + return code from gunpipe(). Otherwise it returns 0. + */ +local int gunzip(z_stream *strm, char *inname, char *outname, int test) +{ + int ret; + int infile, outfile; + + /* open files */ + if (inname == NULL || *inname == 0) { + inname = "-"; + infile = 0; /* stdin */ + } + else { + infile = open(inname, O_RDONLY, 0); + if (infile == -1) { + fprintf(stderr, "gun cannot open %s\n", inname); + return 0; + } + } + if (test) + outfile = -1; + else if (outname == NULL || *outname == 0) { + outname = "-"; + outfile = 1; /* stdout */ + } + else { + outfile = open(outname, O_CREAT | O_TRUNC | O_WRONLY, 0666); + if (outfile == -1) { + close(infile); + fprintf(stderr, "gun cannot create %s\n", outname); + return 0; + } + } + errno = 0; + + /* decompress */ + ret = gunpipe(strm, infile, outfile); + if (outfile > 2) close(outfile); + if (infile > 2) close(infile); + + /* interpret result */ + switch (ret) { + case Z_OK: + case Z_ERRNO: + if (infile > 2 && outfile > 2) { + copymeta(inname, outname); /* copy attributes */ + unlink(inname); + } + if (ret == Z_ERRNO) + fprintf(stderr, "gun warning: trailing garbage ignored in %s\n", + inname); + break; + case Z_DATA_ERROR: + if (outfile > 2) unlink(outname); + fprintf(stderr, "gun data error on %s: %s\n", inname, strm->msg); + break; + case Z_MEM_ERROR: + if (outfile > 2) unlink(outname); + fprintf(stderr, "gun out of memory error--aborting\n"); + return 1; + case Z_BUF_ERROR: + if (outfile > 2) unlink(outname); + if (strm->next_in != Z_NULL) { + fprintf(stderr, "gun write error on %s: %s\n", + outname, strerror(errno)); + } + else if (errno) { + fprintf(stderr, "gun read error on %s: %s\n", + inname, strerror(errno)); + } + else { + fprintf(stderr, "gun unexpected end of file on %s\n", + inname); + } + break; + default: + if (outfile > 2) unlink(outname); + fprintf(stderr, "gun internal error--aborting\n"); + return 1; + } + return 0; +} + +/* Process the gun command line arguments. See the command syntax near the + beginning of this source file. */ +int main(int argc, char **argv) +{ + int ret, len, test; + char *outname; + unsigned char *window; + z_stream strm; + + /* initialize inflateBack state for repeated use */ + window = match; /* reuse LZW match buffer */ + strm.zalloc = Z_NULL; + strm.zfree = Z_NULL; + strm.opaque = Z_NULL; + ret = inflateBackInit(&strm, 15, window); + if (ret != Z_OK) { + fprintf(stderr, "gun out of memory error--aborting\n"); + return 1; + } + + /* decompress each file to the same name with the suffix removed */ + argc--; + argv++; + test = 0; + if (argc && strcmp(*argv, "-h") == 0) { + fprintf(stderr, "gun 1.6 (17 Jan 2010)\n"); + fprintf(stderr, "Copyright (C) 2003-2010 Mark Adler\n"); + fprintf(stderr, "usage: gun [-t] [file1.gz [file2.Z ...]]\n"); + return 0; + } + if (argc && strcmp(*argv, "-t") == 0) { + test = 1; + argc--; + argv++; + } + if (argc) + do { + if (test) + outname = NULL; + else { + len = (int)strlen(*argv); + if (strcmp(*argv + len - 3, ".gz") == 0 || + strcmp(*argv + len - 3, "-gz") == 0) + len -= 3; + else if (strcmp(*argv + len - 2, ".z") == 0 || + strcmp(*argv + len - 2, "-z") == 0 || + strcmp(*argv + len - 2, "_z") == 0 || + strcmp(*argv + len - 2, ".Z") == 0) + len -= 2; + else { + fprintf(stderr, "gun error: no gz type on %s--skipping\n", + *argv); + continue; + } + outname = malloc(len + 1); + if (outname == NULL) { + fprintf(stderr, "gun out of memory error--aborting\n"); + ret = 1; + break; + } + memcpy(outname, *argv, len); + outname[len] = 0; + } + ret = gunzip(&strm, *argv, outname, test); + if (outname != NULL) free(outname); + if (ret) break; + } while (argv++, --argc); + else + ret = gunzip(&strm, NULL, NULL, test); + + /* clean up */ + inflateBackEnd(&strm); + return ret; +} diff --git a/external/zlib/examples/gzappend.c b/external/zlib/examples/gzappend.c new file mode 100644 index 00000000..662dec37 --- /dev/null +++ b/external/zlib/examples/gzappend.c @@ -0,0 +1,504 @@ +/* gzappend -- command to append to a gzip file + + Copyright (C) 2003, 2012 Mark Adler, all rights reserved + version 1.2, 11 Oct 2012 + + This software is provided 'as-is', without any express or implied + warranty. In no event will the author be held liable for any damages + arising from the use of this software. + + Permission is granted to anyone to use this software for any purpose, + including commercial applications, and to alter it and redistribute it + freely, subject to the following restrictions: + + 1. The origin of this software must not be misrepresented; you must not + claim that you wrote the original software. If you use this software + in a product, an acknowledgment in the product documentation would be + appreciated but is not required. + 2. Altered source versions must be plainly marked as such, and must not be + misrepresented as being the original software. + 3. This notice may not be removed or altered from any source distribution. + + Mark Adler madler@alumni.caltech.edu + */ + +/* + * Change history: + * + * 1.0 19 Oct 2003 - First version + * 1.1 4 Nov 2003 - Expand and clarify some comments and notes + * - Add version and copyright to help + * - Send help to stdout instead of stderr + * - Add some preemptive typecasts + * - Add L to constants in lseek() calls + * - Remove some debugging information in error messages + * - Use new data_type definition for zlib 1.2.1 + * - Simplfy and unify file operations + * - Finish off gzip file in gztack() + * - Use deflatePrime() instead of adding empty blocks + * - Keep gzip file clean on appended file read errors + * - Use in-place rotate instead of auxiliary buffer + * (Why you ask? Because it was fun to write!) + * 1.2 11 Oct 2012 - Fix for proper z_const usage + * - Check for input buffer malloc failure + */ + +/* + gzappend takes a gzip file and appends to it, compressing files from the + command line or data from stdin. The gzip file is written to directly, to + avoid copying that file, in case it's large. Note that this results in the + unfriendly behavior that if gzappend fails, the gzip file is corrupted. + + This program was written to illustrate the use of the new Z_BLOCK option of + zlib 1.2.x's inflate() function. This option returns from inflate() at each + block boundary to facilitate locating and modifying the last block bit at + the start of the final deflate block. Also whether using Z_BLOCK or not, + another required feature of zlib 1.2.x is that inflate() now provides the + number of unusued bits in the last input byte used. gzappend will not work + with versions of zlib earlier than 1.2.1. + + gzappend first decompresses the gzip file internally, discarding all but + the last 32K of uncompressed data, and noting the location of the last block + bit and the number of unused bits in the last byte of the compressed data. + The gzip trailer containing the CRC-32 and length of the uncompressed data + is verified. This trailer will be later overwritten. + + Then the last block bit is cleared by seeking back in the file and rewriting + the byte that contains it. Seeking forward, the last byte of the compressed + data is saved along with the number of unused bits to initialize deflate. + + A deflate process is initialized, using the last 32K of the uncompressed + data from the gzip file to initialize the dictionary. If the total + uncompressed data was less than 32K, then all of it is used to initialize + the dictionary. The deflate output bit buffer is also initialized with the + last bits from the original deflate stream. From here on, the data to + append is simply compressed using deflate, and written to the gzip file. + When that is complete, the new CRC-32 and uncompressed length are written + as the trailer of the gzip file. + */ + +#include +#include +#include +#include +#include +#include "zlib.h" + +#define local static +#define LGCHUNK 14 +#define CHUNK (1U << LGCHUNK) +#define DSIZE 32768U + +/* print an error message and terminate with extreme prejudice */ +local void bye(char *msg1, char *msg2) +{ + fprintf(stderr, "gzappend error: %s%s\n", msg1, msg2); + exit(1); +} + +/* return the greatest common divisor of a and b using Euclid's algorithm, + modified to be fast when one argument much greater than the other, and + coded to avoid unnecessary swapping */ +local unsigned gcd(unsigned a, unsigned b) +{ + unsigned c; + + while (a && b) + if (a > b) { + c = b; + while (a - c >= c) + c <<= 1; + a -= c; + } + else { + c = a; + while (b - c >= c) + c <<= 1; + b -= c; + } + return a + b; +} + +/* rotate list[0..len-1] left by rot positions, in place */ +local void rotate(unsigned char *list, unsigned len, unsigned rot) +{ + unsigned char tmp; + unsigned cycles; + unsigned char *start, *last, *to, *from; + + /* normalize rot and handle degenerate cases */ + if (len < 2) return; + if (rot >= len) rot %= len; + if (rot == 0) return; + + /* pointer to last entry in list */ + last = list + (len - 1); + + /* do simple left shift by one */ + if (rot == 1) { + tmp = *list; + memcpy(list, list + 1, len - 1); + *last = tmp; + return; + } + + /* do simple right shift by one */ + if (rot == len - 1) { + tmp = *last; + memmove(list + 1, list, len - 1); + *list = tmp; + return; + } + + /* otherwise do rotate as a set of cycles in place */ + cycles = gcd(len, rot); /* number of cycles */ + do { + start = from = list + cycles; /* start index is arbitrary */ + tmp = *from; /* save entry to be overwritten */ + for (;;) { + to = from; /* next step in cycle */ + from += rot; /* go right rot positions */ + if (from > last) from -= len; /* (pointer better not wrap) */ + if (from == start) break; /* all but one shifted */ + *to = *from; /* shift left */ + } + *to = tmp; /* complete the circle */ + } while (--cycles); +} + +/* structure for gzip file read operations */ +typedef struct { + int fd; /* file descriptor */ + int size; /* 1 << size is bytes in buf */ + unsigned left; /* bytes available at next */ + unsigned char *buf; /* buffer */ + z_const unsigned char *next; /* next byte in buffer */ + char *name; /* file name for error messages */ +} file; + +/* reload buffer */ +local int readin(file *in) +{ + int len; + + len = read(in->fd, in->buf, 1 << in->size); + if (len == -1) bye("error reading ", in->name); + in->left = (unsigned)len; + in->next = in->buf; + return len; +} + +/* read from file in, exit if end-of-file */ +local int readmore(file *in) +{ + if (readin(in) == 0) bye("unexpected end of ", in->name); + return 0; +} + +#define read1(in) (in->left == 0 ? readmore(in) : 0, \ + in->left--, *(in->next)++) + +/* skip over n bytes of in */ +local void skip(file *in, unsigned n) +{ + unsigned bypass; + + if (n > in->left) { + n -= in->left; + bypass = n & ~((1U << in->size) - 1); + if (bypass) { + if (lseek(in->fd, (off_t)bypass, SEEK_CUR) == -1) + bye("seeking ", in->name); + n -= bypass; + } + readmore(in); + if (n > in->left) + bye("unexpected end of ", in->name); + } + in->left -= n; + in->next += n; +} + +/* read a four-byte unsigned integer, little-endian, from in */ +unsigned long read4(file *in) +{ + unsigned long val; + + val = read1(in); + val += (unsigned)read1(in) << 8; + val += (unsigned long)read1(in) << 16; + val += (unsigned long)read1(in) << 24; + return val; +} + +/* skip over gzip header */ +local void gzheader(file *in) +{ + int flags; + unsigned n; + + if (read1(in) != 31 || read1(in) != 139) bye(in->name, " not a gzip file"); + if (read1(in) != 8) bye("unknown compression method in", in->name); + flags = read1(in); + if (flags & 0xe0) bye("unknown header flags set in", in->name); + skip(in, 6); + if (flags & 4) { + n = read1(in); + n += (unsigned)(read1(in)) << 8; + skip(in, n); + } + if (flags & 8) while (read1(in) != 0) ; + if (flags & 16) while (read1(in) != 0) ; + if (flags & 2) skip(in, 2); +} + +/* decompress gzip file "name", return strm with a deflate stream ready to + continue compression of the data in the gzip file, and return a file + descriptor pointing to where to write the compressed data -- the deflate + stream is initialized to compress using level "level" */ +local int gzscan(char *name, z_stream *strm, int level) +{ + int ret, lastbit, left, full; + unsigned have; + unsigned long crc, tot; + unsigned char *window; + off_t lastoff, end; + file gz; + + /* open gzip file */ + gz.name = name; + gz.fd = open(name, O_RDWR, 0); + if (gz.fd == -1) bye("cannot open ", name); + gz.buf = malloc(CHUNK); + if (gz.buf == NULL) bye("out of memory", ""); + gz.size = LGCHUNK; + gz.left = 0; + + /* skip gzip header */ + gzheader(&gz); + + /* prepare to decompress */ + window = malloc(DSIZE); + if (window == NULL) bye("out of memory", ""); + strm->zalloc = Z_NULL; + strm->zfree = Z_NULL; + strm->opaque = Z_NULL; + ret = inflateInit2(strm, -15); + if (ret != Z_OK) bye("out of memory", " or library mismatch"); + + /* decompress the deflate stream, saving append information */ + lastbit = 0; + lastoff = lseek(gz.fd, 0L, SEEK_CUR) - gz.left; + left = 0; + strm->avail_in = gz.left; + strm->next_in = gz.next; + crc = crc32(0L, Z_NULL, 0); + have = full = 0; + do { + /* if needed, get more input */ + if (strm->avail_in == 0) { + readmore(&gz); + strm->avail_in = gz.left; + strm->next_in = gz.next; + } + + /* set up output to next available section of sliding window */ + strm->avail_out = DSIZE - have; + strm->next_out = window + have; + + /* inflate and check for errors */ + ret = inflate(strm, Z_BLOCK); + if (ret == Z_STREAM_ERROR) bye("internal stream error!", ""); + if (ret == Z_MEM_ERROR) bye("out of memory", ""); + if (ret == Z_DATA_ERROR) + bye("invalid compressed data--format violated in", name); + + /* update crc and sliding window pointer */ + crc = crc32(crc, window + have, DSIZE - have - strm->avail_out); + if (strm->avail_out) + have = DSIZE - strm->avail_out; + else { + have = 0; + full = 1; + } + + /* process end of block */ + if (strm->data_type & 128) { + if (strm->data_type & 64) + left = strm->data_type & 0x1f; + else { + lastbit = strm->data_type & 0x1f; + lastoff = lseek(gz.fd, 0L, SEEK_CUR) - strm->avail_in; + } + } + } while (ret != Z_STREAM_END); + inflateEnd(strm); + gz.left = strm->avail_in; + gz.next = strm->next_in; + + /* save the location of the end of the compressed data */ + end = lseek(gz.fd, 0L, SEEK_CUR) - gz.left; + + /* check gzip trailer and save total for deflate */ + if (crc != read4(&gz)) + bye("invalid compressed data--crc mismatch in ", name); + tot = strm->total_out; + if ((tot & 0xffffffffUL) != read4(&gz)) + bye("invalid compressed data--length mismatch in", name); + + /* if not at end of file, warn */ + if (gz.left || readin(&gz)) + fprintf(stderr, + "gzappend warning: junk at end of gzip file overwritten\n"); + + /* clear last block bit */ + lseek(gz.fd, lastoff - (lastbit != 0), SEEK_SET); + if (read(gz.fd, gz.buf, 1) != 1) bye("reading after seek on ", name); + *gz.buf = (unsigned char)(*gz.buf ^ (1 << ((8 - lastbit) & 7))); + lseek(gz.fd, -1L, SEEK_CUR); + if (write(gz.fd, gz.buf, 1) != 1) bye("writing after seek to ", name); + + /* if window wrapped, build dictionary from window by rotating */ + if (full) { + rotate(window, DSIZE, have); + have = DSIZE; + } + + /* set up deflate stream with window, crc, total_in, and leftover bits */ + ret = deflateInit2(strm, level, Z_DEFLATED, -15, 8, Z_DEFAULT_STRATEGY); + if (ret != Z_OK) bye("out of memory", ""); + deflateSetDictionary(strm, window, have); + strm->adler = crc; + strm->total_in = tot; + if (left) { + lseek(gz.fd, --end, SEEK_SET); + if (read(gz.fd, gz.buf, 1) != 1) bye("reading after seek on ", name); + deflatePrime(strm, 8 - left, *gz.buf); + } + lseek(gz.fd, end, SEEK_SET); + + /* clean up and return */ + free(window); + free(gz.buf); + return gz.fd; +} + +/* append file "name" to gzip file gd using deflate stream strm -- if last + is true, then finish off the deflate stream at the end */ +local void gztack(char *name, int gd, z_stream *strm, int last) +{ + int fd, len, ret; + unsigned left; + unsigned char *in, *out; + + /* open file to compress and append */ + fd = 0; + if (name != NULL) { + fd = open(name, O_RDONLY, 0); + if (fd == -1) + fprintf(stderr, "gzappend warning: %s not found, skipping ...\n", + name); + } + + /* allocate buffers */ + in = malloc(CHUNK); + out = malloc(CHUNK); + if (in == NULL || out == NULL) bye("out of memory", ""); + + /* compress input file and append to gzip file */ + do { + /* get more input */ + len = read(fd, in, CHUNK); + if (len == -1) { + fprintf(stderr, + "gzappend warning: error reading %s, skipping rest ...\n", + name); + len = 0; + } + strm->avail_in = (unsigned)len; + strm->next_in = in; + if (len) strm->adler = crc32(strm->adler, in, (unsigned)len); + + /* compress and write all available output */ + do { + strm->avail_out = CHUNK; + strm->next_out = out; + ret = deflate(strm, last && len == 0 ? Z_FINISH : Z_NO_FLUSH); + left = CHUNK - strm->avail_out; + while (left) { + len = write(gd, out + CHUNK - strm->avail_out - left, left); + if (len == -1) bye("writing gzip file", ""); + left -= (unsigned)len; + } + } while (strm->avail_out == 0 && ret != Z_STREAM_END); + } while (len != 0); + + /* write trailer after last entry */ + if (last) { + deflateEnd(strm); + out[0] = (unsigned char)(strm->adler); + out[1] = (unsigned char)(strm->adler >> 8); + out[2] = (unsigned char)(strm->adler >> 16); + out[3] = (unsigned char)(strm->adler >> 24); + out[4] = (unsigned char)(strm->total_in); + out[5] = (unsigned char)(strm->total_in >> 8); + out[6] = (unsigned char)(strm->total_in >> 16); + out[7] = (unsigned char)(strm->total_in >> 24); + len = 8; + do { + ret = write(gd, out + 8 - len, len); + if (ret == -1) bye("writing gzip file", ""); + len -= ret; + } while (len); + close(gd); + } + + /* clean up and return */ + free(out); + free(in); + if (fd > 0) close(fd); +} + +/* process the compression level option if present, scan the gzip file, and + append the specified files, or append the data from stdin if no other file + names are provided on the command line -- the gzip file must be writable + and seekable */ +int main(int argc, char **argv) +{ + int gd, level; + z_stream strm; + + /* ignore command name */ + argc--; argv++; + + /* provide usage if no arguments */ + if (*argv == NULL) { + printf( + "gzappend 1.2 (11 Oct 2012) Copyright (C) 2003, 2012 Mark Adler\n" + ); + printf( + "usage: gzappend [-level] file.gz [ addthis [ andthis ... ]]\n"); + return 0; + } + + /* set compression level */ + level = Z_DEFAULT_COMPRESSION; + if (argv[0][0] == '-') { + if (argv[0][1] < '0' || argv[0][1] > '9' || argv[0][2] != 0) + bye("invalid compression level", ""); + level = argv[0][1] - '0'; + if (*++argv == NULL) bye("no gzip file name after options", ""); + } + + /* prepare to append to gzip file */ + gd = gzscan(*argv++, &strm, level); + + /* append files on command line, or from stdin if none */ + if (*argv == NULL) + gztack(NULL, gd, &strm, 1); + else + do { + gztack(*argv, gd, &strm, argv[1] == NULL); + } while (*++argv != NULL); + return 0; +} diff --git a/external/zlib/examples/gzjoin.c b/external/zlib/examples/gzjoin.c new file mode 100644 index 00000000..89e80984 --- /dev/null +++ b/external/zlib/examples/gzjoin.c @@ -0,0 +1,449 @@ +/* gzjoin -- command to join gzip files into one gzip file + + Copyright (C) 2004, 2005, 2012 Mark Adler, all rights reserved + version 1.2, 14 Aug 2012 + + This software is provided 'as-is', without any express or implied + warranty. In no event will the author be held liable for any damages + arising from the use of this software. + + Permission is granted to anyone to use this software for any purpose, + including commercial applications, and to alter it and redistribute it + freely, subject to the following restrictions: + + 1. The origin of this software must not be misrepresented; you must not + claim that you wrote the original software. If you use this software + in a product, an acknowledgment in the product documentation would be + appreciated but is not required. + 2. Altered source versions must be plainly marked as such, and must not be + misrepresented as being the original software. + 3. This notice may not be removed or altered from any source distribution. + + Mark Adler madler@alumni.caltech.edu + */ + +/* + * Change history: + * + * 1.0 11 Dec 2004 - First version + * 1.1 12 Jun 2005 - Changed ssize_t to long for portability + * 1.2 14 Aug 2012 - Clean up for z_const usage + */ + +/* + gzjoin takes one or more gzip files on the command line and writes out a + single gzip file that will uncompress to the concatenation of the + uncompressed data from the individual gzip files. gzjoin does this without + having to recompress any of the data and without having to calculate a new + crc32 for the concatenated uncompressed data. gzjoin does however have to + decompress all of the input data in order to find the bits in the compressed + data that need to be modified to concatenate the streams. + + gzjoin does not do an integrity check on the input gzip files other than + checking the gzip header and decompressing the compressed data. They are + otherwise assumed to be complete and correct. + + Each joint between gzip files removes at least 18 bytes of previous trailer + and subsequent header, and inserts an average of about three bytes to the + compressed data in order to connect the streams. The output gzip file + has a minimal ten-byte gzip header with no file name or modification time. + + This program was written to illustrate the use of the Z_BLOCK option of + inflate() and the crc32_combine() function. gzjoin will not compile with + versions of zlib earlier than 1.2.3. + */ + +#include /* fputs(), fprintf(), fwrite(), putc() */ +#include /* exit(), malloc(), free() */ +#include /* open() */ +#include /* close(), read(), lseek() */ +#include "zlib.h" + /* crc32(), crc32_combine(), inflateInit2(), inflate(), inflateEnd() */ + +#define local static + +/* exit with an error (return a value to allow use in an expression) */ +local int bail(char *why1, char *why2) +{ + fprintf(stderr, "gzjoin error: %s%s, output incomplete\n", why1, why2); + exit(1); + return 0; +} + +/* -- simple buffered file input with access to the buffer -- */ + +#define CHUNK 32768 /* must be a power of two and fit in unsigned */ + +/* bin buffered input file type */ +typedef struct { + char *name; /* name of file for error messages */ + int fd; /* file descriptor */ + unsigned left; /* bytes remaining at next */ + unsigned char *next; /* next byte to read */ + unsigned char *buf; /* allocated buffer of length CHUNK */ +} bin; + +/* close a buffered file and free allocated memory */ +local void bclose(bin *in) +{ + if (in != NULL) { + if (in->fd != -1) + close(in->fd); + if (in->buf != NULL) + free(in->buf); + free(in); + } +} + +/* open a buffered file for input, return a pointer to type bin, or NULL on + failure */ +local bin *bopen(char *name) +{ + bin *in; + + in = malloc(sizeof(bin)); + if (in == NULL) + return NULL; + in->buf = malloc(CHUNK); + in->fd = open(name, O_RDONLY, 0); + if (in->buf == NULL || in->fd == -1) { + bclose(in); + return NULL; + } + in->left = 0; + in->next = in->buf; + in->name = name; + return in; +} + +/* load buffer from file, return -1 on read error, 0 or 1 on success, with + 1 indicating that end-of-file was reached */ +local int bload(bin *in) +{ + long len; + + if (in == NULL) + return -1; + if (in->left != 0) + return 0; + in->next = in->buf; + do { + len = (long)read(in->fd, in->buf + in->left, CHUNK - in->left); + if (len < 0) + return -1; + in->left += (unsigned)len; + } while (len != 0 && in->left < CHUNK); + return len == 0 ? 1 : 0; +} + +/* get a byte from the file, bail if end of file */ +#define bget(in) (in->left ? 0 : bload(in), \ + in->left ? (in->left--, *(in->next)++) : \ + bail("unexpected end of file on ", in->name)) + +/* get a four-byte little-endian unsigned integer from file */ +local unsigned long bget4(bin *in) +{ + unsigned long val; + + val = bget(in); + val += (unsigned long)(bget(in)) << 8; + val += (unsigned long)(bget(in)) << 16; + val += (unsigned long)(bget(in)) << 24; + return val; +} + +/* skip bytes in file */ +local void bskip(bin *in, unsigned skip) +{ + /* check pointer */ + if (in == NULL) + return; + + /* easy case -- skip bytes in buffer */ + if (skip <= in->left) { + in->left -= skip; + in->next += skip; + return; + } + + /* skip what's in buffer, discard buffer contents */ + skip -= in->left; + in->left = 0; + + /* seek past multiples of CHUNK bytes */ + if (skip > CHUNK) { + unsigned left; + + left = skip & (CHUNK - 1); + if (left == 0) { + /* exact number of chunks: seek all the way minus one byte to check + for end-of-file with a read */ + lseek(in->fd, skip - 1, SEEK_CUR); + if (read(in->fd, in->buf, 1) != 1) + bail("unexpected end of file on ", in->name); + return; + } + + /* skip the integral chunks, update skip with remainder */ + lseek(in->fd, skip - left, SEEK_CUR); + skip = left; + } + + /* read more input and skip remainder */ + bload(in); + if (skip > in->left) + bail("unexpected end of file on ", in->name); + in->left -= skip; + in->next += skip; +} + +/* -- end of buffered input functions -- */ + +/* skip the gzip header from file in */ +local void gzhead(bin *in) +{ + int flags; + + /* verify gzip magic header and compression method */ + if (bget(in) != 0x1f || bget(in) != 0x8b || bget(in) != 8) + bail(in->name, " is not a valid gzip file"); + + /* get and verify flags */ + flags = bget(in); + if ((flags & 0xe0) != 0) + bail("unknown reserved bits set in ", in->name); + + /* skip modification time, extra flags, and os */ + bskip(in, 6); + + /* skip extra field if present */ + if (flags & 4) { + unsigned len; + + len = bget(in); + len += (unsigned)(bget(in)) << 8; + bskip(in, len); + } + + /* skip file name if present */ + if (flags & 8) + while (bget(in) != 0) + ; + + /* skip comment if present */ + if (flags & 16) + while (bget(in) != 0) + ; + + /* skip header crc if present */ + if (flags & 2) + bskip(in, 2); +} + +/* write a four-byte little-endian unsigned integer to out */ +local void put4(unsigned long val, FILE *out) +{ + putc(val & 0xff, out); + putc((val >> 8) & 0xff, out); + putc((val >> 16) & 0xff, out); + putc((val >> 24) & 0xff, out); +} + +/* Load up zlib stream from buffered input, bail if end of file */ +local void zpull(z_streamp strm, bin *in) +{ + if (in->left == 0) + bload(in); + if (in->left == 0) + bail("unexpected end of file on ", in->name); + strm->avail_in = in->left; + strm->next_in = in->next; +} + +/* Write header for gzip file to out and initialize trailer. */ +local void gzinit(unsigned long *crc, unsigned long *tot, FILE *out) +{ + fwrite("\x1f\x8b\x08\0\0\0\0\0\0\xff", 1, 10, out); + *crc = crc32(0L, Z_NULL, 0); + *tot = 0; +} + +/* Copy the compressed data from name, zeroing the last block bit of the last + block if clr is true, and adding empty blocks as needed to get to a byte + boundary. If clr is false, then the last block becomes the last block of + the output, and the gzip trailer is written. crc and tot maintains the + crc and length (modulo 2^32) of the output for the trailer. The resulting + gzip file is written to out. gzinit() must be called before the first call + of gzcopy() to write the gzip header and to initialize crc and tot. */ +local void gzcopy(char *name, int clr, unsigned long *crc, unsigned long *tot, + FILE *out) +{ + int ret; /* return value from zlib functions */ + int pos; /* where the "last block" bit is in byte */ + int last; /* true if processing the last block */ + bin *in; /* buffered input file */ + unsigned char *start; /* start of compressed data in buffer */ + unsigned char *junk; /* buffer for uncompressed data -- discarded */ + z_off_t len; /* length of uncompressed data (support > 4 GB) */ + z_stream strm; /* zlib inflate stream */ + + /* open gzip file and skip header */ + in = bopen(name); + if (in == NULL) + bail("could not open ", name); + gzhead(in); + + /* allocate buffer for uncompressed data and initialize raw inflate + stream */ + junk = malloc(CHUNK); + strm.zalloc = Z_NULL; + strm.zfree = Z_NULL; + strm.opaque = Z_NULL; + strm.avail_in = 0; + strm.next_in = Z_NULL; + ret = inflateInit2(&strm, -15); + if (junk == NULL || ret != Z_OK) + bail("out of memory", ""); + + /* inflate and copy compressed data, clear last-block bit if requested */ + len = 0; + zpull(&strm, in); + start = in->next; + last = start[0] & 1; + if (last && clr) + start[0] &= ~1; + strm.avail_out = 0; + for (;;) { + /* if input used and output done, write used input and get more */ + if (strm.avail_in == 0 && strm.avail_out != 0) { + fwrite(start, 1, strm.next_in - start, out); + start = in->buf; + in->left = 0; + zpull(&strm, in); + } + + /* decompress -- return early when end-of-block reached */ + strm.avail_out = CHUNK; + strm.next_out = junk; + ret = inflate(&strm, Z_BLOCK); + switch (ret) { + case Z_MEM_ERROR: + bail("out of memory", ""); + case Z_DATA_ERROR: + bail("invalid compressed data in ", in->name); + } + + /* update length of uncompressed data */ + len += CHUNK - strm.avail_out; + + /* check for block boundary (only get this when block copied out) */ + if (strm.data_type & 128) { + /* if that was the last block, then done */ + if (last) + break; + + /* number of unused bits in last byte */ + pos = strm.data_type & 7; + + /* find the next last-block bit */ + if (pos != 0) { + /* next last-block bit is in last used byte */ + pos = 0x100 >> pos; + last = strm.next_in[-1] & pos; + if (last && clr) + in->buf[strm.next_in - in->buf - 1] &= ~pos; + } + else { + /* next last-block bit is in next unused byte */ + if (strm.avail_in == 0) { + /* don't have that byte yet -- get it */ + fwrite(start, 1, strm.next_in - start, out); + start = in->buf; + in->left = 0; + zpull(&strm, in); + } + last = strm.next_in[0] & 1; + if (last && clr) + in->buf[strm.next_in - in->buf] &= ~1; + } + } + } + + /* update buffer with unused input */ + in->left = strm.avail_in; + in->next = in->buf + (strm.next_in - in->buf); + + /* copy used input, write empty blocks to get to byte boundary */ + pos = strm.data_type & 7; + fwrite(start, 1, in->next - start - 1, out); + last = in->next[-1]; + if (pos == 0 || !clr) + /* already at byte boundary, or last file: write last byte */ + putc(last, out); + else { + /* append empty blocks to last byte */ + last &= ((0x100 >> pos) - 1); /* assure unused bits are zero */ + if (pos & 1) { + /* odd -- append an empty stored block */ + putc(last, out); + if (pos == 1) + putc(0, out); /* two more bits in block header */ + fwrite("\0\0\xff\xff", 1, 4, out); + } + else { + /* even -- append 1, 2, or 3 empty fixed blocks */ + switch (pos) { + case 6: + putc(last | 8, out); + last = 0; + case 4: + putc(last | 0x20, out); + last = 0; + case 2: + putc(last | 0x80, out); + putc(0, out); + } + } + } + + /* update crc and tot */ + *crc = crc32_combine(*crc, bget4(in), len); + *tot += (unsigned long)len; + + /* clean up */ + inflateEnd(&strm); + free(junk); + bclose(in); + + /* write trailer if this is the last gzip file */ + if (!clr) { + put4(*crc, out); + put4(*tot, out); + } +} + +/* join the gzip files on the command line, write result to stdout */ +int main(int argc, char **argv) +{ + unsigned long crc, tot; /* running crc and total uncompressed length */ + + /* skip command name */ + argc--; + argv++; + + /* show usage if no arguments */ + if (argc == 0) { + fputs("gzjoin usage: gzjoin f1.gz [f2.gz [f3.gz ...]] > fjoin.gz\n", + stderr); + return 0; + } + + /* join gzip files on command line and write to stdout */ + gzinit(&crc, &tot, stdout); + while (argc--) + gzcopy(*argv++, argc, &crc, &tot, stdout); + + /* done */ + return 0; +} diff --git a/external/zlib/examples/gzlog.c b/external/zlib/examples/gzlog.c new file mode 100644 index 00000000..922f878d --- /dev/null +++ b/external/zlib/examples/gzlog.c @@ -0,0 +1,1059 @@ +/* + * gzlog.c + * Copyright (C) 2004, 2008, 2012 Mark Adler, all rights reserved + * For conditions of distribution and use, see copyright notice in gzlog.h + * version 2.2, 14 Aug 2012 + */ + +/* + gzlog provides a mechanism for frequently appending short strings to a gzip + file that is efficient both in execution time and compression ratio. The + strategy is to write the short strings in an uncompressed form to the end of + the gzip file, only compressing when the amount of uncompressed data has + reached a given threshold. + + gzlog also provides protection against interruptions in the process due to + system crashes. The status of the operation is recorded in an extra field + in the gzip file, and is only updated once the gzip file is brought to a + valid state. The last data to be appended or compressed is saved in an + auxiliary file, so that if the operation is interrupted, it can be completed + the next time an append operation is attempted. + + gzlog maintains another auxiliary file with the last 32K of data from the + compressed portion, which is preloaded for the compression of the subsequent + data. This minimizes the impact to the compression ratio of appending. + */ + +/* + Operations Concept: + + Files (log name "foo"): + foo.gz -- gzip file with the complete log + foo.add -- last message to append or last data to compress + foo.dict -- dictionary of the last 32K of data for next compression + foo.temp -- temporary dictionary file for compression after this one + foo.lock -- lock file for reading and writing the other files + foo.repairs -- log file for log file recovery operations (not compressed) + + gzip file structure: + - fixed-length (no file name) header with extra field (see below) + - compressed data ending initially with empty stored block + - uncompressed data filling out originally empty stored block and + subsequent stored blocks as needed (16K max each) + - gzip trailer + - no junk at end (no other gzip streams) + + When appending data, the information in the first three items above plus the + foo.add file are sufficient to recover an interrupted append operation. The + extra field has the necessary information to restore the start of the last + stored block and determine where to append the data in the foo.add file, as + well as the crc and length of the gzip data before the append operation. + + The foo.add file is created before the gzip file is marked for append, and + deleted after the gzip file is marked as complete. So if the append + operation is interrupted, the data to add will still be there. If due to + some external force, the foo.add file gets deleted between when the append + operation was interrupted and when recovery is attempted, the gzip file will + still be restored, but without the appended data. + + When compressing data, the information in the first two items above plus the + foo.add file are sufficient to recover an interrupted compress operation. + The extra field has the necessary information to find the end of the + compressed data, and contains both the crc and length of just the compressed + data and of the complete set of data including the contents of the foo.add + file. + + Again, the foo.add file is maintained during the compress operation in case + of an interruption. If in the unlikely event the foo.add file with the data + to be compressed is missing due to some external force, a gzip file with + just the previous compressed data will be reconstructed. In this case, all + of the data that was to be compressed is lost (approximately one megabyte). + This will not occur if all that happened was an interruption of the compress + operation. + + The third state that is marked is the replacement of the old dictionary with + the new dictionary after a compress operation. Once compression is + complete, the gzip file is marked as being in the replace state. This + completes the gzip file, so an interrupt after being so marked does not + result in recompression. Then the dictionary file is replaced, and the gzip + file is marked as completed. This state prevents the possibility of + restarting compression with the wrong dictionary file. + + All three operations are wrapped by a lock/unlock procedure. In order to + gain exclusive access to the log files, first a foo.lock file must be + exclusively created. When all operations are complete, the lock is + released by deleting the foo.lock file. If when attempting to create the + lock file, it already exists and the modify time of the lock file is more + than five minutes old (set by the PATIENCE define below), then the old + lock file is considered stale and deleted, and the exclusive creation of + the lock file is retried. To assure that there are no false assessments + of the staleness of the lock file, the operations periodically touch the + lock file to update the modified date. + + Following is the definition of the extra field with all of the information + required to enable the above append and compress operations and their + recovery if interrupted. Multi-byte values are stored little endian + (consistent with the gzip format). File pointers are eight bytes long. + The crc's and lengths for the gzip trailer are four bytes long. (Note that + the length at the end of a gzip file is used for error checking only, and + for large files is actually the length modulo 2^32.) The stored block + length is two bytes long. The gzip extra field two-byte identification is + "ap" for append. It is assumed that writing the extra field to the file is + an "atomic" operation. That is, either all of the extra field is written + to the file, or none of it is, if the operation is interrupted right at the + point of updating the extra field. This is a reasonable assumption, since + the extra field is within the first 52 bytes of the file, which is smaller + than any expected block size for a mass storage device (usually 512 bytes or + larger). + + Extra field (35 bytes): + - Pointer to first stored block length -- this points to the two-byte length + of the first stored block, which is followed by the two-byte, one's + complement of that length. The stored block length is preceded by the + three-bit header of the stored block, which is the actual start of the + stored block in the deflate format. See the bit offset field below. + - Pointer to the last stored block length. This is the same as above, but + for the last stored block of the uncompressed data in the gzip file. + Initially this is the same as the first stored block length pointer. + When the stored block gets to 16K (see the MAX_STORE define), then a new + stored block as added, at which point the last stored block length pointer + is different from the first stored block length pointer. When they are + different, the first bit of the last stored block header is eight bits, or + one byte back from the block length. + - Compressed data crc and length. This is the crc and length of the data + that is in the compressed portion of the deflate stream. These are used + only in the event that the foo.add file containing the data to compress is + lost after a compress operation is interrupted. + - Total data crc and length. This is the crc and length of all of the data + stored in the gzip file, compressed and uncompressed. It is used to + reconstruct the gzip trailer when compressing, as well as when recovering + interrupted operations. + - Final stored block length. This is used to quickly find where to append, + and allows the restoration of the original final stored block state when + an append operation is interrupted. + - First stored block start as the number of bits back from the final stored + block first length byte. This value is in the range of 3..10, and is + stored as the low three bits of the final byte of the extra field after + subtracting three (0..7). This allows the last-block bit of the stored + block header to be updated when a new stored block is added, for the case + when the first stored block and the last stored block are the same. (When + they are different, the numbers of bits back is known to be eight.) This + also allows for new compressed data to be appended to the old compressed + data in the compress operation, overwriting the previous first stored + block, or for the compressed data to be terminated and a valid gzip file + reconstructed on the off chance that a compression operation was + interrupted and the data to compress in the foo.add file was deleted. + - The operation in process. This is the next two bits in the last byte (the + bits under the mask 0x18). The are interpreted as 0: nothing in process, + 1: append in process, 2: compress in process, 3: replace in process. + - The top three bits of the last byte in the extra field are reserved and + are currently set to zero. + + Main procedure: + - Exclusively create the foo.lock file using the O_CREAT and O_EXCL modes of + the system open() call. If the modify time of an existing lock file is + more than PATIENCE seconds old, then the lock file is deleted and the + exclusive create is retried. + - Load the extra field from the foo.gz file, and see if an operation was in + progress but not completed. If so, apply the recovery procedure below. + - Perform the append procedure with the provided data. + - If the uncompressed data in the foo.gz file is 1MB or more, apply the + compress procedure. + - Delete the foo.lock file. + + Append procedure: + - Put what to append in the foo.add file so that the operation can be + restarted if this procedure is interrupted. + - Mark the foo.gz extra field with the append operation in progress. + + Restore the original last-block bit and stored block length of the last + stored block from the information in the extra field, in case a previous + append operation was interrupted. + - Append the provided data to the last stored block, creating new stored + blocks as needed and updating the stored blocks last-block bits and + lengths. + - Update the crc and length with the new data, and write the gzip trailer. + - Write over the extra field (with a single write operation) with the new + pointers, lengths, and crc's, and mark the gzip file as not in process. + Though there is still a foo.add file, it will be ignored since nothing + is in process. If a foo.add file is leftover from a previously + completed operation, it is truncated when writing new data to it. + - Delete the foo.add file. + + Compress and replace procedures: + - Read all of the uncompressed data in the stored blocks in foo.gz and write + it to foo.add. Also write foo.temp with the last 32K of that data to + provide a dictionary for the next invocation of this procedure. + - Rewrite the extra field marking foo.gz with a compression in process. + * If there is no data provided to compress (due to a missing foo.add file + when recovering), reconstruct and truncate the foo.gz file to contain + only the previous compressed data and proceed to the step after the next + one. Otherwise ... + - Compress the data with the dictionary in foo.dict, and write to the + foo.gz file starting at the bit immediately following the last previously + compressed block. If there is no foo.dict, proceed anyway with the + compression at slightly reduced efficiency. (For the foo.dict file to be + missing requires some external failure beyond simply the interruption of + a compress operation.) During this process, the foo.lock file is + periodically touched to assure that that file is not considered stale by + another process before we're done. The deflation is terminated with a + non-last empty static block (10 bits long), that is then located and + written over by a last-bit-set empty stored block. + - Append the crc and length of the data in the gzip file (previously + calculated during the append operations). + - Write over the extra field with the updated stored block offsets, bits + back, crc's, and lengths, and mark foo.gz as in process for a replacement + of the dictionary. + @ Delete the foo.add file. + - Replace foo.dict with foo.temp. + - Write over the extra field, marking foo.gz as complete. + + Recovery procedure: + - If not a replace recovery, read in the foo.add file, and provide that data + to the appropriate recovery below. If there is no foo.add file, provide + a zero data length to the recovery. In that case, the append recovery + restores the foo.gz to the previous compressed + uncompressed data state. + For the the compress recovery, a missing foo.add file results in foo.gz + being restored to the previous compressed-only data state. + - Append recovery: + - Pick up append at + step above + - Compress recovery: + - Pick up compress at * step above + - Replace recovery: + - Pick up compress at @ step above + - Log the repair with a date stamp in foo.repairs + */ + +#include +#include /* rename, fopen, fprintf, fclose */ +#include /* malloc, free */ +#include /* strlen, strrchr, strcpy, strncpy, strcmp */ +#include /* open */ +#include /* lseek, read, write, close, unlink, sleep, */ + /* ftruncate, fsync */ +#include /* errno */ +#include /* time, ctime */ +#include /* stat */ +#include /* utimes */ +#include "zlib.h" /* crc32 */ + +#include "gzlog.h" /* header for external access */ + +#define local static +typedef unsigned int uint; +typedef unsigned long ulong; + +/* Macro for debugging to deterministically force recovery operations */ +#ifdef DEBUG + #include /* longjmp */ + jmp_buf gzlog_jump; /* where to go back to */ + int gzlog_bail = 0; /* which point to bail at (1..8) */ + int gzlog_count = -1; /* number of times through to wait */ +# define BAIL(n) do { if (n == gzlog_bail && gzlog_count-- == 0) \ + longjmp(gzlog_jump, gzlog_bail); } while (0) +#else +# define BAIL(n) +#endif + +/* how old the lock file can be in seconds before considering it stale */ +#define PATIENCE 300 + +/* maximum stored block size in Kbytes -- must be in 1..63 */ +#define MAX_STORE 16 + +/* number of stored Kbytes to trigger compression (must be >= 32 to allow + dictionary construction, and <= 204 * MAX_STORE, in order for >> 10 to + discard the stored block headers contribution of five bytes each) */ +#define TRIGGER 1024 + +/* size of a deflate dictionary (this cannot be changed) */ +#define DICT 32768U + +/* values for the operation (2 bits) */ +#define NO_OP 0 +#define APPEND_OP 1 +#define COMPRESS_OP 2 +#define REPLACE_OP 3 + +/* macros to extract little-endian integers from an unsigned byte buffer */ +#define PULL2(p) ((p)[0]+((uint)((p)[1])<<8)) +#define PULL4(p) (PULL2(p)+((ulong)PULL2(p+2)<<16)) +#define PULL8(p) (PULL4(p)+((off_t)PULL4(p+4)<<32)) + +/* macros to store integers into a byte buffer in little-endian order */ +#define PUT2(p,a) do {(p)[0]=a;(p)[1]=(a)>>8;} while(0) +#define PUT4(p,a) do {PUT2(p,a);PUT2(p+2,a>>16);} while(0) +#define PUT8(p,a) do {PUT4(p,a);PUT4(p+4,a>>32);} while(0) + +/* internal structure for log information */ +#define LOGID "\106\035\172" /* should be three non-zero characters */ +struct log { + char id[4]; /* contains LOGID to detect inadvertent overwrites */ + int fd; /* file descriptor for .gz file, opened read/write */ + char *path; /* allocated path, e.g. "/var/log/foo" or "foo" */ + char *end; /* end of path, for appending suffices such as ".gz" */ + off_t first; /* offset of first stored block first length byte */ + int back; /* location of first block id in bits back from first */ + uint stored; /* bytes currently in last stored block */ + off_t last; /* offset of last stored block first length byte */ + ulong ccrc; /* crc of compressed data */ + ulong clen; /* length (modulo 2^32) of compressed data */ + ulong tcrc; /* crc of total data */ + ulong tlen; /* length (modulo 2^32) of total data */ + time_t lock; /* last modify time of our lock file */ +}; + +/* gzip header for gzlog */ +local unsigned char log_gzhead[] = { + 0x1f, 0x8b, /* magic gzip id */ + 8, /* compression method is deflate */ + 4, /* there is an extra field (no file name) */ + 0, 0, 0, 0, /* no modification time provided */ + 0, 0xff, /* no extra flags, no OS specified */ + 39, 0, 'a', 'p', 35, 0 /* extra field with "ap" subfield */ + /* 35 is EXTRA, 39 is EXTRA + 4 */ +}; + +#define HEAD sizeof(log_gzhead) /* should be 16 */ + +/* initial gzip extra field content (52 == HEAD + EXTRA + 1) */ +local unsigned char log_gzext[] = { + 52, 0, 0, 0, 0, 0, 0, 0, /* offset of first stored block length */ + 52, 0, 0, 0, 0, 0, 0, 0, /* offset of last stored block length */ + 0, 0, 0, 0, 0, 0, 0, 0, /* compressed data crc and length */ + 0, 0, 0, 0, 0, 0, 0, 0, /* total data crc and length */ + 0, 0, /* final stored block data length */ + 5 /* op is NO_OP, last bit 8 bits back */ +}; + +#define EXTRA sizeof(log_gzext) /* should be 35 */ + +/* initial gzip data and trailer */ +local unsigned char log_gzbody[] = { + 1, 0, 0, 0xff, 0xff, /* empty stored block (last) */ + 0, 0, 0, 0, /* crc */ + 0, 0, 0, 0 /* uncompressed length */ +}; + +#define BODY sizeof(log_gzbody) + +/* Exclusively create foo.lock in order to negotiate exclusive access to the + foo.* files. If the modify time of an existing lock file is greater than + PATIENCE seconds in the past, then consider the lock file to have been + abandoned, delete it, and try the exclusive create again. Save the lock + file modify time for verification of ownership. Return 0 on success, or -1 + on failure, usually due to an access restriction or invalid path. Note that + if stat() or unlink() fails, it may be due to another process noticing the + abandoned lock file a smidge sooner and deleting it, so those are not + flagged as an error. */ +local int log_lock(struct log *log) +{ + int fd; + struct stat st; + + strcpy(log->end, ".lock"); + while ((fd = open(log->path, O_CREAT | O_EXCL, 0644)) < 0) { + if (errno != EEXIST) + return -1; + if (stat(log->path, &st) == 0 && time(NULL) - st.st_mtime > PATIENCE) { + unlink(log->path); + continue; + } + sleep(2); /* relinquish the CPU for two seconds while waiting */ + } + close(fd); + if (stat(log->path, &st) == 0) + log->lock = st.st_mtime; + return 0; +} + +/* Update the modify time of the lock file to now, in order to prevent another + task from thinking that the lock is stale. Save the lock file modify time + for verification of ownership. */ +local void log_touch(struct log *log) +{ + struct stat st; + + strcpy(log->end, ".lock"); + utimes(log->path, NULL); + if (stat(log->path, &st) == 0) + log->lock = st.st_mtime; +} + +/* Check the log file modify time against what is expected. Return true if + this is not our lock. If it is our lock, touch it to keep it. */ +local int log_check(struct log *log) +{ + struct stat st; + + strcpy(log->end, ".lock"); + if (stat(log->path, &st) || st.st_mtime != log->lock) + return 1; + log_touch(log); + return 0; +} + +/* Unlock a previously acquired lock, but only if it's ours. */ +local void log_unlock(struct log *log) +{ + if (log_check(log)) + return; + strcpy(log->end, ".lock"); + unlink(log->path); + log->lock = 0; +} + +/* Check the gzip header and read in the extra field, filling in the values in + the log structure. Return op on success or -1 if the gzip header was not as + expected. op is the current operation in progress last written to the extra + field. This assumes that the gzip file has already been opened, with the + file descriptor log->fd. */ +local int log_head(struct log *log) +{ + int op; + unsigned char buf[HEAD + EXTRA]; + + if (lseek(log->fd, 0, SEEK_SET) < 0 || + read(log->fd, buf, HEAD + EXTRA) != HEAD + EXTRA || + memcmp(buf, log_gzhead, HEAD)) { + return -1; + } + log->first = PULL8(buf + HEAD); + log->last = PULL8(buf + HEAD + 8); + log->ccrc = PULL4(buf + HEAD + 16); + log->clen = PULL4(buf + HEAD + 20); + log->tcrc = PULL4(buf + HEAD + 24); + log->tlen = PULL4(buf + HEAD + 28); + log->stored = PULL2(buf + HEAD + 32); + log->back = 3 + (buf[HEAD + 34] & 7); + op = (buf[HEAD + 34] >> 3) & 3; + return op; +} + +/* Write over the extra field contents, marking the operation as op. Use fsync + to assure that the device is written to, and in the requested order. This + operation, and only this operation, is assumed to be atomic in order to + assure that the log is recoverable in the event of an interruption at any + point in the process. Return -1 if the write to foo.gz failed. */ +local int log_mark(struct log *log, int op) +{ + int ret; + unsigned char ext[EXTRA]; + + PUT8(ext, log->first); + PUT8(ext + 8, log->last); + PUT4(ext + 16, log->ccrc); + PUT4(ext + 20, log->clen); + PUT4(ext + 24, log->tcrc); + PUT4(ext + 28, log->tlen); + PUT2(ext + 32, log->stored); + ext[34] = log->back - 3 + (op << 3); + fsync(log->fd); + ret = lseek(log->fd, HEAD, SEEK_SET) < 0 || + write(log->fd, ext, EXTRA) != EXTRA ? -1 : 0; + fsync(log->fd); + return ret; +} + +/* Rewrite the last block header bits and subsequent zero bits to get to a byte + boundary, setting the last block bit if last is true, and then write the + remainder of the stored block header (length and one's complement). Leave + the file pointer after the end of the last stored block data. Return -1 if + there is a read or write failure on the foo.gz file */ +local int log_last(struct log *log, int last) +{ + int back, len, mask; + unsigned char buf[6]; + + /* determine the locations of the bytes and bits to modify */ + back = log->last == log->first ? log->back : 8; + len = back > 8 ? 2 : 1; /* bytes back from log->last */ + mask = 0x80 >> ((back - 1) & 7); /* mask for block last-bit */ + + /* get the byte to modify (one or two back) into buf[0] -- don't need to + read the byte if the last-bit is eight bits back, since in that case + the entire byte will be modified */ + buf[0] = 0; + if (back != 8 && (lseek(log->fd, log->last - len, SEEK_SET) < 0 || + read(log->fd, buf, 1) != 1)) + return -1; + + /* change the last-bit of the last stored block as requested -- note + that all bits above the last-bit are set to zero, per the type bits + of a stored block being 00 and per the convention that the bits to + bring the stream to a byte boundary are also zeros */ + buf[1] = 0; + buf[2 - len] = (*buf & (mask - 1)) + (last ? mask : 0); + + /* write the modified stored block header and lengths, move the file + pointer to after the last stored block data */ + PUT2(buf + 2, log->stored); + PUT2(buf + 4, log->stored ^ 0xffff); + return lseek(log->fd, log->last - len, SEEK_SET) < 0 || + write(log->fd, buf + 2 - len, len + 4) != len + 4 || + lseek(log->fd, log->stored, SEEK_CUR) < 0 ? -1 : 0; +} + +/* Append len bytes from data to the locked and open log file. len may be zero + if recovering and no .add file was found. In that case, the previous state + of the foo.gz file is restored. The data is appended uncompressed in + deflate stored blocks. Return -1 if there was an error reading or writing + the foo.gz file. */ +local int log_append(struct log *log, unsigned char *data, size_t len) +{ + uint put; + off_t end; + unsigned char buf[8]; + + /* set the last block last-bit and length, in case recovering an + interrupted append, then position the file pointer to append to the + block */ + if (log_last(log, 1)) + return -1; + + /* append, adding stored blocks and updating the offset of the last stored + block as needed, and update the total crc and length */ + while (len) { + /* append as much as we can to the last block */ + put = (MAX_STORE << 10) - log->stored; + if (put > len) + put = (uint)len; + if (put) { + if (write(log->fd, data, put) != put) + return -1; + BAIL(1); + log->tcrc = crc32(log->tcrc, data, put); + log->tlen += put; + log->stored += put; + data += put; + len -= put; + } + + /* if we need to, add a new empty stored block */ + if (len) { + /* mark current block as not last */ + if (log_last(log, 0)) + return -1; + + /* point to new, empty stored block */ + log->last += 4 + log->stored + 1; + log->stored = 0; + } + + /* mark last block as last, update its length */ + if (log_last(log, 1)) + return -1; + BAIL(2); + } + + /* write the new crc and length trailer, and truncate just in case (could + be recovering from partial append with a missing foo.add file) */ + PUT4(buf, log->tcrc); + PUT4(buf + 4, log->tlen); + if (write(log->fd, buf, 8) != 8 || + (end = lseek(log->fd, 0, SEEK_CUR)) < 0 || ftruncate(log->fd, end)) + return -1; + + /* write the extra field, marking the log file as done, delete .add file */ + if (log_mark(log, NO_OP)) + return -1; + strcpy(log->end, ".add"); + unlink(log->path); /* ignore error, since may not exist */ + return 0; +} + +/* Replace the foo.dict file with the foo.temp file. Also delete the foo.add + file, since the compress operation may have been interrupted before that was + done. Returns 1 if memory could not be allocated, or -1 if reading or + writing foo.gz fails, or if the rename fails for some reason other than + foo.temp not existing. foo.temp not existing is a permitted error, since + the replace operation may have been interrupted after the rename is done, + but before foo.gz is marked as complete. */ +local int log_replace(struct log *log) +{ + int ret; + char *dest; + + /* delete foo.add file */ + strcpy(log->end, ".add"); + unlink(log->path); /* ignore error, since may not exist */ + BAIL(3); + + /* rename foo.name to foo.dict, replacing foo.dict if it exists */ + strcpy(log->end, ".dict"); + dest = malloc(strlen(log->path) + 1); + if (dest == NULL) + return -2; + strcpy(dest, log->path); + strcpy(log->end, ".temp"); + ret = rename(log->path, dest); + free(dest); + if (ret && errno != ENOENT) + return -1; + BAIL(4); + + /* mark the foo.gz file as done */ + return log_mark(log, NO_OP); +} + +/* Compress the len bytes at data and append the compressed data to the + foo.gz deflate data immediately after the previous compressed data. This + overwrites the previous uncompressed data, which was stored in foo.add + and is the data provided in data[0..len-1]. If this operation is + interrupted, it picks up at the start of this routine, with the foo.add + file read in again. If there is no data to compress (len == 0), then we + simply terminate the foo.gz file after the previously compressed data, + appending a final empty stored block and the gzip trailer. Return -1 if + reading or writing the log.gz file failed, or -2 if there was a memory + allocation failure. */ +local int log_compress(struct log *log, unsigned char *data, size_t len) +{ + int fd; + uint got, max; + ssize_t dict; + off_t end; + z_stream strm; + unsigned char buf[DICT]; + + /* compress and append compressed data */ + if (len) { + /* set up for deflate, allocating memory */ + strm.zalloc = Z_NULL; + strm.zfree = Z_NULL; + strm.opaque = Z_NULL; + if (deflateInit2(&strm, Z_DEFAULT_COMPRESSION, Z_DEFLATED, -15, 8, + Z_DEFAULT_STRATEGY) != Z_OK) + return -2; + + /* read in dictionary (last 32K of data that was compressed) */ + strcpy(log->end, ".dict"); + fd = open(log->path, O_RDONLY, 0); + if (fd >= 0) { + dict = read(fd, buf, DICT); + close(fd); + if (dict < 0) { + deflateEnd(&strm); + return -1; + } + if (dict) + deflateSetDictionary(&strm, buf, (uint)dict); + } + log_touch(log); + + /* prime deflate with last bits of previous block, position write + pointer to write those bits and overwrite what follows */ + if (lseek(log->fd, log->first - (log->back > 8 ? 2 : 1), + SEEK_SET) < 0 || + read(log->fd, buf, 1) != 1 || lseek(log->fd, -1, SEEK_CUR) < 0) { + deflateEnd(&strm); + return -1; + } + deflatePrime(&strm, (8 - log->back) & 7, *buf); + + /* compress, finishing with a partial non-last empty static block */ + strm.next_in = data; + max = (((uint)0 - 1) >> 1) + 1; /* in case int smaller than size_t */ + do { + strm.avail_in = len > max ? max : (uint)len; + len -= strm.avail_in; + do { + strm.avail_out = DICT; + strm.next_out = buf; + deflate(&strm, len ? Z_NO_FLUSH : Z_PARTIAL_FLUSH); + got = DICT - strm.avail_out; + if (got && write(log->fd, buf, got) != got) { + deflateEnd(&strm); + return -1; + } + log_touch(log); + } while (strm.avail_out == 0); + } while (len); + deflateEnd(&strm); + BAIL(5); + + /* find start of empty static block -- scanning backwards the first one + bit is the second bit of the block, if the last byte is zero, then + we know the byte before that has a one in the top bit, since an + empty static block is ten bits long */ + if ((log->first = lseek(log->fd, -1, SEEK_CUR)) < 0 || + read(log->fd, buf, 1) != 1) + return -1; + log->first++; + if (*buf) { + log->back = 1; + while ((*buf & ((uint)1 << (8 - log->back++))) == 0) + ; /* guaranteed to terminate, since *buf != 0 */ + } + else + log->back = 10; + + /* update compressed crc and length */ + log->ccrc = log->tcrc; + log->clen = log->tlen; + } + else { + /* no data to compress -- fix up existing gzip stream */ + log->tcrc = log->ccrc; + log->tlen = log->clen; + } + + /* complete and truncate gzip stream */ + log->last = log->first; + log->stored = 0; + PUT4(buf, log->tcrc); + PUT4(buf + 4, log->tlen); + if (log_last(log, 1) || write(log->fd, buf, 8) != 8 || + (end = lseek(log->fd, 0, SEEK_CUR)) < 0 || ftruncate(log->fd, end)) + return -1; + BAIL(6); + + /* mark as being in the replace operation */ + if (log_mark(log, REPLACE_OP)) + return -1; + + /* execute the replace operation and mark the file as done */ + return log_replace(log); +} + +/* log a repair record to the .repairs file */ +local void log_log(struct log *log, int op, char *record) +{ + time_t now; + FILE *rec; + + now = time(NULL); + strcpy(log->end, ".repairs"); + rec = fopen(log->path, "a"); + if (rec == NULL) + return; + fprintf(rec, "%.24s %s recovery: %s\n", ctime(&now), op == APPEND_OP ? + "append" : (op == COMPRESS_OP ? "compress" : "replace"), record); + fclose(rec); + return; +} + +/* Recover the interrupted operation op. First read foo.add for recovering an + append or compress operation. Return -1 if there was an error reading or + writing foo.gz or reading an existing foo.add, or -2 if there was a memory + allocation failure. */ +local int log_recover(struct log *log, int op) +{ + int fd, ret = 0; + unsigned char *data = NULL; + size_t len = 0; + struct stat st; + + /* log recovery */ + log_log(log, op, "start"); + + /* load foo.add file if expected and present */ + if (op == APPEND_OP || op == COMPRESS_OP) { + strcpy(log->end, ".add"); + if (stat(log->path, &st) == 0 && st.st_size) { + len = (size_t)(st.st_size); + if ((off_t)len != st.st_size || + (data = malloc(st.st_size)) == NULL) { + log_log(log, op, "allocation failure"); + return -2; + } + if ((fd = open(log->path, O_RDONLY, 0)) < 0) { + log_log(log, op, ".add file read failure"); + return -1; + } + ret = (size_t)read(fd, data, len) != len; + close(fd); + if (ret) { + log_log(log, op, ".add file read failure"); + return -1; + } + log_log(log, op, "loaded .add file"); + } + else + log_log(log, op, "missing .add file!"); + } + + /* recover the interrupted operation */ + switch (op) { + case APPEND_OP: + ret = log_append(log, data, len); + break; + case COMPRESS_OP: + ret = log_compress(log, data, len); + break; + case REPLACE_OP: + ret = log_replace(log); + } + + /* log status */ + log_log(log, op, ret ? "failure" : "complete"); + + /* clean up */ + if (data != NULL) + free(data); + return ret; +} + +/* Close the foo.gz file (if open) and release the lock. */ +local void log_close(struct log *log) +{ + if (log->fd >= 0) + close(log->fd); + log->fd = -1; + log_unlock(log); +} + +/* Open foo.gz, verify the header, and load the extra field contents, after + first creating the foo.lock file to gain exclusive access to the foo.* + files. If foo.gz does not exist or is empty, then write the initial header, + extra, and body content of an empty foo.gz log file. If there is an error + creating the lock file due to access restrictions, or an error reading or + writing the foo.gz file, or if the foo.gz file is not a proper log file for + this object (e.g. not a gzip file or does not contain the expected extra + field), then return true. If there is an error, the lock is released. + Otherwise, the lock is left in place. */ +local int log_open(struct log *log) +{ + int op; + + /* release open file resource if left over -- can occur if lock lost + between gzlog_open() and gzlog_write() */ + if (log->fd >= 0) + close(log->fd); + log->fd = -1; + + /* negotiate exclusive access */ + if (log_lock(log) < 0) + return -1; + + /* open the log file, foo.gz */ + strcpy(log->end, ".gz"); + log->fd = open(log->path, O_RDWR | O_CREAT, 0644); + if (log->fd < 0) { + log_close(log); + return -1; + } + + /* if new, initialize foo.gz with an empty log, delete old dictionary */ + if (lseek(log->fd, 0, SEEK_END) == 0) { + if (write(log->fd, log_gzhead, HEAD) != HEAD || + write(log->fd, log_gzext, EXTRA) != EXTRA || + write(log->fd, log_gzbody, BODY) != BODY) { + log_close(log); + return -1; + } + strcpy(log->end, ".dict"); + unlink(log->path); + } + + /* verify log file and load extra field information */ + if ((op = log_head(log)) < 0) { + log_close(log); + return -1; + } + + /* check for interrupted process and if so, recover */ + if (op != NO_OP && log_recover(log, op)) { + log_close(log); + return -1; + } + + /* touch the lock file to prevent another process from grabbing it */ + log_touch(log); + return 0; +} + +/* See gzlog.h for the description of the external methods below */ +gzlog *gzlog_open(char *path) +{ + size_t n; + struct log *log; + + /* check arguments */ + if (path == NULL || *path == 0) + return NULL; + + /* allocate and initialize log structure */ + log = malloc(sizeof(struct log)); + if (log == NULL) + return NULL; + strcpy(log->id, LOGID); + log->fd = -1; + + /* save path and end of path for name construction */ + n = strlen(path); + log->path = malloc(n + 9); /* allow for ".repairs" */ + if (log->path == NULL) { + free(log); + return NULL; + } + strcpy(log->path, path); + log->end = log->path + n; + + /* gain exclusive access and verify log file -- may perform a + recovery operation if needed */ + if (log_open(log)) { + free(log->path); + free(log); + return NULL; + } + + /* return pointer to log structure */ + return log; +} + +/* gzlog_compress() return values: + 0: all good + -1: file i/o error (usually access issue) + -2: memory allocation failure + -3: invalid log pointer argument */ +int gzlog_compress(gzlog *logd) +{ + int fd, ret; + uint block; + size_t len, next; + unsigned char *data, buf[5]; + struct log *log = logd; + + /* check arguments */ + if (log == NULL || strcmp(log->id, LOGID)) + return -3; + + /* see if we lost the lock -- if so get it again and reload the extra + field information (it probably changed), recover last operation if + necessary */ + if (log_check(log) && log_open(log)) + return -1; + + /* create space for uncompressed data */ + len = ((size_t)(log->last - log->first) & ~(((size_t)1 << 10) - 1)) + + log->stored; + if ((data = malloc(len)) == NULL) + return -2; + + /* do statement here is just a cheap trick for error handling */ + do { + /* read in the uncompressed data */ + if (lseek(log->fd, log->first - 1, SEEK_SET) < 0) + break; + next = 0; + while (next < len) { + if (read(log->fd, buf, 5) != 5) + break; + block = PULL2(buf + 1); + if (next + block > len || + read(log->fd, (char *)data + next, block) != block) + break; + next += block; + } + if (lseek(log->fd, 0, SEEK_CUR) != log->last + 4 + log->stored) + break; + log_touch(log); + + /* write the uncompressed data to the .add file */ + strcpy(log->end, ".add"); + fd = open(log->path, O_WRONLY | O_CREAT | O_TRUNC, 0644); + if (fd < 0) + break; + ret = (size_t)write(fd, data, len) != len; + if (ret | close(fd)) + break; + log_touch(log); + + /* write the dictionary for the next compress to the .temp file */ + strcpy(log->end, ".temp"); + fd = open(log->path, O_WRONLY | O_CREAT | O_TRUNC, 0644); + if (fd < 0) + break; + next = DICT > len ? len : DICT; + ret = (size_t)write(fd, (char *)data + len - next, next) != next; + if (ret | close(fd)) + break; + log_touch(log); + + /* roll back to compressed data, mark the compress in progress */ + log->last = log->first; + log->stored = 0; + if (log_mark(log, COMPRESS_OP)) + break; + BAIL(7); + + /* compress and append the data (clears mark) */ + ret = log_compress(log, data, len); + free(data); + return ret; + } while (0); + + /* broke out of do above on i/o error */ + free(data); + return -1; +} + +/* gzlog_write() return values: + 0: all good + -1: file i/o error (usually access issue) + -2: memory allocation failure + -3: invalid log pointer argument */ +int gzlog_write(gzlog *logd, void *data, size_t len) +{ + int fd, ret; + struct log *log = logd; + + /* check arguments */ + if (log == NULL || strcmp(log->id, LOGID)) + return -3; + if (data == NULL || len <= 0) + return 0; + + /* see if we lost the lock -- if so get it again and reload the extra + field information (it probably changed), recover last operation if + necessary */ + if (log_check(log) && log_open(log)) + return -1; + + /* create and write .add file */ + strcpy(log->end, ".add"); + fd = open(log->path, O_WRONLY | O_CREAT | O_TRUNC, 0644); + if (fd < 0) + return -1; + ret = (size_t)write(fd, data, len) != len; + if (ret | close(fd)) + return -1; + log_touch(log); + + /* mark log file with append in progress */ + if (log_mark(log, APPEND_OP)) + return -1; + BAIL(8); + + /* append data (clears mark) */ + if (log_append(log, data, len)) + return -1; + + /* check to see if it's time to compress -- if not, then done */ + if (((log->last - log->first) >> 10) + (log->stored >> 10) < TRIGGER) + return 0; + + /* time to compress */ + return gzlog_compress(log); +} + +/* gzlog_close() return values: + 0: ok + -3: invalid log pointer argument */ +int gzlog_close(gzlog *logd) +{ + struct log *log = logd; + + /* check arguments */ + if (log == NULL || strcmp(log->id, LOGID)) + return -3; + + /* close the log file and release the lock */ + log_close(log); + + /* free structure and return */ + if (log->path != NULL) + free(log->path); + strcpy(log->id, "bad"); + free(log); + return 0; +} diff --git a/external/zlib/examples/gzlog.h b/external/zlib/examples/gzlog.h new file mode 100644 index 00000000..86f0cecb --- /dev/null +++ b/external/zlib/examples/gzlog.h @@ -0,0 +1,91 @@ +/* gzlog.h + Copyright (C) 2004, 2008, 2012 Mark Adler, all rights reserved + version 2.2, 14 Aug 2012 + + This software is provided 'as-is', without any express or implied + warranty. In no event will the author be held liable for any damages + arising from the use of this software. + + Permission is granted to anyone to use this software for any purpose, + including commercial applications, and to alter it and redistribute it + freely, subject to the following restrictions: + + 1. The origin of this software must not be misrepresented; you must not + claim that you wrote the original software. If you use this software + in a product, an acknowledgment in the product documentation would be + appreciated but is not required. + 2. Altered source versions must be plainly marked as such, and must not be + misrepresented as being the original software. + 3. This notice may not be removed or altered from any source distribution. + + Mark Adler madler@alumni.caltech.edu + */ + +/* Version History: + 1.0 26 Nov 2004 First version + 2.0 25 Apr 2008 Complete redesign for recovery of interrupted operations + Interface changed slightly in that now path is a prefix + Compression now occurs as needed during gzlog_write() + gzlog_write() now always leaves the log file as valid gzip + 2.1 8 Jul 2012 Fix argument checks in gzlog_compress() and gzlog_write() + 2.2 14 Aug 2012 Clean up signed comparisons + */ + +/* + The gzlog object allows writing short messages to a gzipped log file, + opening the log file locked for small bursts, and then closing it. The log + object works by appending stored (uncompressed) data to the gzip file until + 1 MB has been accumulated. At that time, the stored data is compressed, and + replaces the uncompressed data in the file. The log file is truncated to + its new size at that time. After each write operation, the log file is a + valid gzip file that can decompressed to recover what was written. + + The gzlog operations can be interupted at any point due to an application or + system crash, and the log file will be recovered the next time the log is + opened with gzlog_open(). + */ + +#ifndef GZLOG_H +#define GZLOG_H + +/* gzlog object type */ +typedef void gzlog; + +/* Open a gzlog object, creating the log file if it does not exist. Return + NULL on error. Note that gzlog_open() could take a while to complete if it + has to wait to verify that a lock is stale (possibly for five minutes), or + if there is significant contention with other instantiations of this object + when locking the resource. path is the prefix of the file names created by + this object. If path is "foo", then the log file will be "foo.gz", and + other auxiliary files will be created and destroyed during the process: + "foo.dict" for a compression dictionary, "foo.temp" for a temporary (next) + dictionary, "foo.add" for data being added or compressed, "foo.lock" for the + lock file, and "foo.repairs" to log recovery operations performed due to + interrupted gzlog operations. A gzlog_open() followed by a gzlog_close() + will recover a previously interrupted operation, if any. */ +gzlog *gzlog_open(char *path); + +/* Write to a gzlog object. Return zero on success, -1 if there is a file i/o + error on any of the gzlog files (this should not happen if gzlog_open() + succeeded, unless the device has run out of space or leftover auxiliary + files have permissions or ownership that prevent their use), -2 if there is + a memory allocation failure, or -3 if the log argument is invalid (e.g. if + it was not created by gzlog_open()). This function will write data to the + file uncompressed, until 1 MB has been accumulated, at which time that data + will be compressed. The log file will be a valid gzip file upon successful + return. */ +int gzlog_write(gzlog *log, void *data, size_t len); + +/* Force compression of any uncompressed data in the log. This should be used + sparingly, if at all. The main application would be when a log file will + not be appended to again. If this is used to compress frequently while + appending, it will both significantly increase the execution time and + reduce the compression ratio. The return codes are the same as for + gzlog_write(). */ +int gzlog_compress(gzlog *log); + +/* Close a gzlog object. Return zero on success, -3 if the log argument is + invalid. The log object is freed, and so cannot be referenced again. */ +int gzlog_close(gzlog *log); + +#endif diff --git a/external/zlib/examples/zlib_how.html b/external/zlib/examples/zlib_how.html new file mode 100644 index 00000000..444ff1c9 --- /dev/null +++ b/external/zlib/examples/zlib_how.html @@ -0,0 +1,545 @@ + + + + +zlib Usage Example + + + +

zlib Usage Example

+We often get questions about how the deflate() and inflate() functions should be used. +Users wonder when they should provide more input, when they should use more output, +what to do with a Z_BUF_ERROR, how to make sure the process terminates properly, and +so on. So for those who have read zlib.h (a few times), and +would like further edification, below is an annotated example in C of simple routines to compress and decompress +from an input file to an output file using deflate() and inflate() respectively. The +annotations are interspersed between lines of the code. So please read between the lines. +We hope this helps explain some of the intricacies of zlib. +

+Without further adieu, here is the program zpipe.c: +


+/* zpipe.c: example of proper use of zlib's inflate() and deflate()
+   Not copyrighted -- provided to the public domain
+   Version 1.4  11 December 2005  Mark Adler */
+
+/* Version history:
+   1.0  30 Oct 2004  First version
+   1.1   8 Nov 2004  Add void casting for unused return values
+                     Use switch statement for inflate() return values
+   1.2   9 Nov 2004  Add assertions to document zlib guarantees
+   1.3   6 Apr 2005  Remove incorrect assertion in inf()
+   1.4  11 Dec 2005  Add hack to avoid MSDOS end-of-line conversions
+                     Avoid some compiler warnings for input and output buffers
+ */
+
+We now include the header files for the required definitions. From +stdio.h we use fopen(), fread(), fwrite(), +feof(), ferror(), and fclose() for file i/o, and +fputs() for error messages. From string.h we use +strcmp() for command line argument processing. +From assert.h we use the assert() macro. +From zlib.h +we use the basic compression functions deflateInit(), +deflate(), and deflateEnd(), and the basic decompression +functions inflateInit(), inflate(), and +inflateEnd(). +

+#include <stdio.h>
+#include <string.h>
+#include <assert.h>
+#include "zlib.h"
+
+This is an ugly hack required to avoid corruption of the input and output data on +Windows/MS-DOS systems. Without this, those systems would assume that the input and output +files are text, and try to convert the end-of-line characters from one standard to +another. That would corrupt binary data, and in particular would render the compressed data unusable. +This sets the input and output to binary which suppresses the end-of-line conversions. +SET_BINARY_MODE() will be used later on stdin and stdout, at the beginning of main(). +

+#if defined(MSDOS) || defined(OS2) || defined(WIN32) || defined(__CYGWIN__)
+#  include <fcntl.h>
+#  include <io.h>
+#  define SET_BINARY_MODE(file) setmode(fileno(file), O_BINARY)
+#else
+#  define SET_BINARY_MODE(file)
+#endif
+
+CHUNK is simply the buffer size for feeding data to and pulling data +from the zlib routines. Larger buffer sizes would be more efficient, +especially for inflate(). If the memory is available, buffers sizes +on the order of 128K or 256K bytes should be used. +

+#define CHUNK 16384
+
+The def() routine compresses data from an input file to an output file. The output data +will be in the zlib format, which is different from the gzip or zip +formats. The zlib format has a very small header of only two bytes to identify it as +a zlib stream and to provide decoding information, and a four-byte trailer with a fast +check value to verify the integrity of the uncompressed data after decoding. +

+/* Compress from file source to file dest until EOF on source.
+   def() returns Z_OK on success, Z_MEM_ERROR if memory could not be
+   allocated for processing, Z_STREAM_ERROR if an invalid compression
+   level is supplied, Z_VERSION_ERROR if the version of zlib.h and the
+   version of the library linked do not match, or Z_ERRNO if there is
+   an error reading or writing the files. */
+int def(FILE *source, FILE *dest, int level)
+{
+
+Here are the local variables for def(). ret will be used for zlib +return codes. flush will keep track of the current flushing state for deflate(), +which is either no flushing, or flush to completion after the end of the input file is reached. +have is the amount of data returned from deflate(). The strm structure +is used to pass information to and from the zlib routines, and to maintain the +deflate() state. in and out are the input and output buffers for +deflate(). +

+    int ret, flush;
+    unsigned have;
+    z_stream strm;
+    unsigned char in[CHUNK];
+    unsigned char out[CHUNK];
+
+The first thing we do is to initialize the zlib state for compression using +deflateInit(). This must be done before the first use of deflate(). +The zalloc, zfree, and opaque fields in the strm +structure must be initialized before calling deflateInit(). Here they are +set to the zlib constant Z_NULL to request that zlib use +the default memory allocation routines. An application may also choose to provide +custom memory allocation routines here. deflateInit() will allocate on the +order of 256K bytes for the internal state. +(See zlib Technical Details.) +

+deflateInit() is called with a pointer to the structure to be initialized and +the compression level, which is an integer in the range of -1 to 9. Lower compression +levels result in faster execution, but less compression. Higher levels result in +greater compression, but slower execution. The zlib constant Z_DEFAULT_COMPRESSION, +equal to -1, +provides a good compromise between compression and speed and is equivalent to level 6. +Level 0 actually does no compression at all, and in fact expands the data slightly to produce +the zlib format (it is not a byte-for-byte copy of the input). +More advanced applications of zlib +may use deflateInit2() here instead. Such an application may want to reduce how +much memory will be used, at some price in compression. Or it may need to request a +gzip header and trailer instead of a zlib header and trailer, or raw +encoding with no header or trailer at all. +

+We must check the return value of deflateInit() against the zlib constant +Z_OK to make sure that it was able to +allocate memory for the internal state, and that the provided arguments were valid. +deflateInit() will also check that the version of zlib that the zlib.h +file came from matches the version of zlib actually linked with the program. This +is especially important for environments in which zlib is a shared library. +

+Note that an application can initialize multiple, independent zlib streams, which can +operate in parallel. The state information maintained in the structure allows the zlib +routines to be reentrant. +


+    /* allocate deflate state */
+    strm.zalloc = Z_NULL;
+    strm.zfree = Z_NULL;
+    strm.opaque = Z_NULL;
+    ret = deflateInit(&strm, level);
+    if (ret != Z_OK)
+        return ret;
+
+With the pleasantries out of the way, now we can get down to business. The outer do-loop +reads all of the input file and exits at the bottom of the loop once end-of-file is reached. +This loop contains the only call of deflate(). So we must make sure that all of the +input data has been processed and that all of the output data has been generated and consumed +before we fall out of the loop at the bottom. +

+    /* compress until end of file */
+    do {
+
+We start off by reading data from the input file. The number of bytes read is put directly +into avail_in, and a pointer to those bytes is put into next_in. We also +check to see if end-of-file on the input has been reached. If we are at the end of file, then flush is set to the +zlib constant Z_FINISH, which is later passed to deflate() to +indicate that this is the last chunk of input data to compress. We need to use feof() +to check for end-of-file as opposed to seeing if fewer than CHUNK bytes have been read. The +reason is that if the input file length is an exact multiple of CHUNK, we will miss +the fact that we got to the end-of-file, and not know to tell deflate() to finish +up the compressed stream. If we are not yet at the end of the input, then the zlib +constant Z_NO_FLUSH will be passed to deflate to indicate that we are still +in the middle of the uncompressed data. +

+If there is an error in reading from the input file, the process is aborted with +deflateEnd() being called to free the allocated zlib state before returning +the error. We wouldn't want a memory leak, now would we? deflateEnd() can be called +at any time after the state has been initialized. Once that's done, deflateInit() (or +deflateInit2()) would have to be called to start a new compression process. There is +no point here in checking the deflateEnd() return code. The deallocation can't fail. +


+        strm.avail_in = fread(in, 1, CHUNK, source);
+        if (ferror(source)) {
+            (void)deflateEnd(&strm);
+            return Z_ERRNO;
+        }
+        flush = feof(source) ? Z_FINISH : Z_NO_FLUSH;
+        strm.next_in = in;
+
+The inner do-loop passes our chunk of input data to deflate(), and then +keeps calling deflate() until it is done producing output. Once there is no more +new output, deflate() is guaranteed to have consumed all of the input, i.e., +avail_in will be zero. +

+        /* run deflate() on input until output buffer not full, finish
+           compression if all of source has been read in */
+        do {
+
+Output space is provided to deflate() by setting avail_out to the number +of available output bytes and next_out to a pointer to that space. +

+            strm.avail_out = CHUNK;
+            strm.next_out = out;
+
+Now we call the compression engine itself, deflate(). It takes as many of the +avail_in bytes at next_in as it can process, and writes as many as +avail_out bytes to next_out. Those counters and pointers are then +updated past the input data consumed and the output data written. It is the amount of +output space available that may limit how much input is consumed. +Hence the inner loop to make sure that +all of the input is consumed by providing more output space each time. Since avail_in +and next_in are updated by deflate(), we don't have to mess with those +between deflate() calls until it's all used up. +

+The parameters to deflate() are a pointer to the strm structure containing +the input and output information and the internal compression engine state, and a parameter +indicating whether and how to flush data to the output. Normally deflate will consume +several K bytes of input data before producing any output (except for the header), in order +to accumulate statistics on the data for optimum compression. It will then put out a burst of +compressed data, and proceed to consume more input before the next burst. Eventually, +deflate() +must be told to terminate the stream, complete the compression with provided input data, and +write out the trailer check value. deflate() will continue to compress normally as long +as the flush parameter is Z_NO_FLUSH. Once the Z_FINISH parameter is provided, +deflate() will begin to complete the compressed output stream. However depending on how +much output space is provided, deflate() may have to be called several times until it +has provided the complete compressed stream, even after it has consumed all of the input. The flush +parameter must continue to be Z_FINISH for those subsequent calls. +

+There are other values of the flush parameter that are used in more advanced applications. You can +force deflate() to produce a burst of output that encodes all of the input data provided +so far, even if it wouldn't have otherwise, for example to control data latency on a link with +compressed data. You can also ask that deflate() do that as well as erase any history up to +that point so that what follows can be decompressed independently, for example for random access +applications. Both requests will degrade compression by an amount depending on how often such +requests are made. +

+deflate() has a return value that can indicate errors, yet we do not check it here. Why +not? Well, it turns out that deflate() can do no wrong here. Let's go through +deflate()'s return values and dispense with them one by one. The possible values are +Z_OK, Z_STREAM_END, Z_STREAM_ERROR, or Z_BUF_ERROR. Z_OK +is, well, ok. Z_STREAM_END is also ok and will be returned for the last call of +deflate(). This is already guaranteed by calling deflate() with Z_FINISH +until it has no more output. Z_STREAM_ERROR is only possible if the stream is not +initialized properly, but we did initialize it properly. There is no harm in checking for +Z_STREAM_ERROR here, for example to check for the possibility that some +other part of the application inadvertently clobbered the memory containing the zlib state. +Z_BUF_ERROR will be explained further below, but +suffice it to say that this is simply an indication that deflate() could not consume +more input or produce more output. deflate() can be called again with more output space +or more available input, which it will be in this code. +


+            ret = deflate(&strm, flush);    /* no bad return value */
+            assert(ret != Z_STREAM_ERROR);  /* state not clobbered */
+
+Now we compute how much output deflate() provided on the last call, which is the +difference between how much space was provided before the call, and how much output space +is still available after the call. Then that data, if any, is written to the output file. +We can then reuse the output buffer for the next call of deflate(). Again if there +is a file i/o error, we call deflateEnd() before returning to avoid a memory leak. +

+            have = CHUNK - strm.avail_out;
+            if (fwrite(out, 1, have, dest) != have || ferror(dest)) {
+                (void)deflateEnd(&strm);
+                return Z_ERRNO;
+            }
+
+The inner do-loop is repeated until the last deflate() call fails to fill the +provided output buffer. Then we know that deflate() has done as much as it can with +the provided input, and that all of that input has been consumed. We can then fall out of this +loop and reuse the input buffer. +

+The way we tell that deflate() has no more output is by seeing that it did not fill +the output buffer, leaving avail_out greater than zero. However suppose that +deflate() has no more output, but just so happened to exactly fill the output buffer! +avail_out is zero, and we can't tell that deflate() has done all it can. +As far as we know, deflate() +has more output for us. So we call it again. But now deflate() produces no output +at all, and avail_out remains unchanged as CHUNK. That deflate() call +wasn't able to do anything, either consume input or produce output, and so it returns +Z_BUF_ERROR. (See, I told you I'd cover this later.) However this is not a problem at +all. Now we finally have the desired indication that deflate() is really done, +and so we drop out of the inner loop to provide more input to deflate(). +

+With flush set to Z_FINISH, this final set of deflate() calls will +complete the output stream. Once that is done, subsequent calls of deflate() would return +Z_STREAM_ERROR if the flush parameter is not Z_FINISH, and do no more processing +until the state is reinitialized. +

+Some applications of zlib have two loops that call deflate() +instead of the single inner loop we have here. The first loop would call +without flushing and feed all of the data to deflate(). The second loop would call +deflate() with no more +data and the Z_FINISH parameter to complete the process. As you can see from this +example, that can be avoided by simply keeping track of the current flush state. +


+        } while (strm.avail_out == 0);
+        assert(strm.avail_in == 0);     /* all input will be used */
+
+Now we check to see if we have already processed all of the input file. That information was +saved in the flush variable, so we see if that was set to Z_FINISH. If so, +then we're done and we fall out of the outer loop. We're guaranteed to get Z_STREAM_END +from the last deflate() call, since we ran it until the last chunk of input was +consumed and all of the output was generated. +

+        /* done when last data in file processed */
+    } while (flush != Z_FINISH);
+    assert(ret == Z_STREAM_END);        /* stream will be complete */
+
+The process is complete, but we still need to deallocate the state to avoid a memory leak +(or rather more like a memory hemorrhage if you didn't do this). Then +finally we can return with a happy return value. +

+    /* clean up and return */
+    (void)deflateEnd(&strm);
+    return Z_OK;
+}
+
+Now we do the same thing for decompression in the inf() routine. inf() +decompresses what is hopefully a valid zlib stream from the input file and writes the +uncompressed data to the output file. Much of the discussion above for def() +applies to inf() as well, so the discussion here will focus on the differences between +the two. +

+/* Decompress from file source to file dest until stream ends or EOF.
+   inf() returns Z_OK on success, Z_MEM_ERROR if memory could not be
+   allocated for processing, Z_DATA_ERROR if the deflate data is
+   invalid or incomplete, Z_VERSION_ERROR if the version of zlib.h and
+   the version of the library linked do not match, or Z_ERRNO if there
+   is an error reading or writing the files. */
+int inf(FILE *source, FILE *dest)
+{
+
+The local variables have the same functionality as they do for def(). The +only difference is that there is no flush variable, since inflate() +can tell from the zlib stream itself when the stream is complete. +

+    int ret;
+    unsigned have;
+    z_stream strm;
+    unsigned char in[CHUNK];
+    unsigned char out[CHUNK];
+
+The initialization of the state is the same, except that there is no compression level, +of course, and two more elements of the structure are initialized. avail_in +and next_in must be initialized before calling inflateInit(). This +is because the application has the option to provide the start of the zlib stream in +order for inflateInit() to have access to information about the compression +method to aid in memory allocation. In the current implementation of zlib +(up through versions 1.2.x), the method-dependent memory allocations are deferred to the first call of +inflate() anyway. However those fields must be initialized since later versions +of zlib that provide more compression methods may take advantage of this interface. +In any case, no decompression is performed by inflateInit(), so the +avail_out and next_out fields do not need to be initialized before calling. +

+Here avail_in is set to zero and next_in is set to Z_NULL to +indicate that no input data is being provided. +


+    /* allocate inflate state */
+    strm.zalloc = Z_NULL;
+    strm.zfree = Z_NULL;
+    strm.opaque = Z_NULL;
+    strm.avail_in = 0;
+    strm.next_in = Z_NULL;
+    ret = inflateInit(&strm);
+    if (ret != Z_OK)
+        return ret;
+
+The outer do-loop decompresses input until inflate() indicates +that it has reached the end of the compressed data and has produced all of the uncompressed +output. This is in contrast to def() which processes all of the input file. +If end-of-file is reached before the compressed data self-terminates, then the compressed +data is incomplete and an error is returned. +

+    /* decompress until deflate stream ends or end of file */
+    do {
+
+We read input data and set the strm structure accordingly. If we've reached the +end of the input file, then we leave the outer loop and report an error, since the +compressed data is incomplete. Note that we may read more data than is eventually consumed +by inflate(), if the input file continues past the zlib stream. +For applications where zlib streams are embedded in other data, this routine would +need to be modified to return the unused data, or at least indicate how much of the input +data was not used, so the application would know where to pick up after the zlib stream. +

+        strm.avail_in = fread(in, 1, CHUNK, source);
+        if (ferror(source)) {
+            (void)inflateEnd(&strm);
+            return Z_ERRNO;
+        }
+        if (strm.avail_in == 0)
+            break;
+        strm.next_in = in;
+
+The inner do-loop has the same function it did in def(), which is to +keep calling inflate() until has generated all of the output it can with the +provided input. +

+        /* run inflate() on input until output buffer not full */
+        do {
+
+Just like in def(), the same output space is provided for each call of inflate(). +

+            strm.avail_out = CHUNK;
+            strm.next_out = out;
+
+Now we run the decompression engine itself. There is no need to adjust the flush parameter, since +the zlib format is self-terminating. The main difference here is that there are +return values that we need to pay attention to. Z_DATA_ERROR +indicates that inflate() detected an error in the zlib compressed data format, +which means that either the data is not a zlib stream to begin with, or that the data was +corrupted somewhere along the way since it was compressed. The other error to be processed is +Z_MEM_ERROR, which can occur since memory allocation is deferred until inflate() +needs it, unlike deflate(), whose memory is allocated at the start by deflateInit(). +

+Advanced applications may use +deflateSetDictionary() to prime deflate() with a set of likely data to improve the +first 32K or so of compression. This is noted in the zlib header, so inflate() +requests that that dictionary be provided before it can start to decompress. Without the dictionary, +correct decompression is not possible. For this routine, we have no idea what the dictionary is, +so the Z_NEED_DICT indication is converted to a Z_DATA_ERROR. +

+inflate() can also return Z_STREAM_ERROR, which should not be possible here, +but could be checked for as noted above for def(). Z_BUF_ERROR does not need to be +checked for here, for the same reasons noted for def(). Z_STREAM_END will be +checked for later. +


+            ret = inflate(&strm, Z_NO_FLUSH);
+            assert(ret != Z_STREAM_ERROR);  /* state not clobbered */
+            switch (ret) {
+            case Z_NEED_DICT:
+                ret = Z_DATA_ERROR;     /* and fall through */
+            case Z_DATA_ERROR:
+            case Z_MEM_ERROR:
+                (void)inflateEnd(&strm);
+                return ret;
+            }
+
+The output of inflate() is handled identically to that of deflate(). +

+            have = CHUNK - strm.avail_out;
+            if (fwrite(out, 1, have, dest) != have || ferror(dest)) {
+                (void)inflateEnd(&strm);
+                return Z_ERRNO;
+            }
+
+The inner do-loop ends when inflate() has no more output as indicated +by not filling the output buffer, just as for deflate(). In this case, we cannot +assert that strm.avail_in will be zero, since the deflate stream may end before the file +does. +

+        } while (strm.avail_out == 0);
+
+The outer do-loop ends when inflate() reports that it has reached the +end of the input zlib stream, has completed the decompression and integrity +check, and has provided all of the output. This is indicated by the inflate() +return value Z_STREAM_END. The inner loop is guaranteed to leave ret +equal to Z_STREAM_END if the last chunk of the input file read contained the end +of the zlib stream. So if the return value is not Z_STREAM_END, the +loop continues to read more input. +

+        /* done when inflate() says it's done */
+    } while (ret != Z_STREAM_END);
+
+At this point, decompression successfully completed, or we broke out of the loop due to no +more data being available from the input file. If the last inflate() return value +is not Z_STREAM_END, then the zlib stream was incomplete and a data error +is returned. Otherwise, we return with a happy return value. Of course, inflateEnd() +is called first to avoid a memory leak. +

+    /* clean up and return */
+    (void)inflateEnd(&strm);
+    return ret == Z_STREAM_END ? Z_OK : Z_DATA_ERROR;
+}
+
+That ends the routines that directly use zlib. The following routines make this +a command-line program by running data through the above routines from stdin to +stdout, and handling any errors reported by def() or inf(). +

+zerr() is used to interpret the possible error codes from def() +and inf(), as detailed in their comments above, and print out an error message. +Note that these are only a subset of the possible return values from deflate() +and inflate(). +


+/* report a zlib or i/o error */
+void zerr(int ret)
+{
+    fputs("zpipe: ", stderr);
+    switch (ret) {
+    case Z_ERRNO:
+        if (ferror(stdin))
+            fputs("error reading stdin\n", stderr);
+        if (ferror(stdout))
+            fputs("error writing stdout\n", stderr);
+        break;
+    case Z_STREAM_ERROR:
+        fputs("invalid compression level\n", stderr);
+        break;
+    case Z_DATA_ERROR:
+        fputs("invalid or incomplete deflate data\n", stderr);
+        break;
+    case Z_MEM_ERROR:
+        fputs("out of memory\n", stderr);
+        break;
+    case Z_VERSION_ERROR:
+        fputs("zlib version mismatch!\n", stderr);
+    }
+}
+
+Here is the main() routine used to test def() and inf(). The +zpipe command is simply a compression pipe from stdin to stdout, if +no arguments are given, or it is a decompression pipe if zpipe -d is used. If any other +arguments are provided, no compression or decompression is performed. Instead a usage +message is displayed. Examples are zpipe < foo.txt > foo.txt.z to compress, and +zpipe -d < foo.txt.z > foo.txt to decompress. +

+/* compress or decompress from stdin to stdout */
+int main(int argc, char **argv)
+{
+    int ret;
+
+    /* avoid end-of-line conversions */
+    SET_BINARY_MODE(stdin);
+    SET_BINARY_MODE(stdout);
+
+    /* do compression if no arguments */
+    if (argc == 1) {
+        ret = def(stdin, stdout, Z_DEFAULT_COMPRESSION);
+        if (ret != Z_OK)
+            zerr(ret);
+        return ret;
+    }
+
+    /* do decompression if -d specified */
+    else if (argc == 2 && strcmp(argv[1], "-d") == 0) {
+        ret = inf(stdin, stdout);
+        if (ret != Z_OK)
+            zerr(ret);
+        return ret;
+    }
+
+    /* otherwise, report usage */
+    else {
+        fputs("zpipe usage: zpipe [-d] < source > dest\n", stderr);
+        return 1;
+    }
+}
+
+
+Copyright (c) 2004, 2005 by Mark Adler
Last modified 11 December 2005 + + diff --git a/external/zlib/examples/zpipe.c b/external/zlib/examples/zpipe.c new file mode 100644 index 00000000..83535d16 --- /dev/null +++ b/external/zlib/examples/zpipe.c @@ -0,0 +1,205 @@ +/* zpipe.c: example of proper use of zlib's inflate() and deflate() + Not copyrighted -- provided to the public domain + Version 1.4 11 December 2005 Mark Adler */ + +/* Version history: + 1.0 30 Oct 2004 First version + 1.1 8 Nov 2004 Add void casting for unused return values + Use switch statement for inflate() return values + 1.2 9 Nov 2004 Add assertions to document zlib guarantees + 1.3 6 Apr 2005 Remove incorrect assertion in inf() + 1.4 11 Dec 2005 Add hack to avoid MSDOS end-of-line conversions + Avoid some compiler warnings for input and output buffers + */ + +#include +#include +#include +#include "zlib.h" + +#if defined(MSDOS) || defined(OS2) || defined(WIN32) || defined(__CYGWIN__) +# include +# include +# define SET_BINARY_MODE(file) setmode(fileno(file), O_BINARY) +#else +# define SET_BINARY_MODE(file) +#endif + +#define CHUNK 16384 + +/* Compress from file source to file dest until EOF on source. + def() returns Z_OK on success, Z_MEM_ERROR if memory could not be + allocated for processing, Z_STREAM_ERROR if an invalid compression + level is supplied, Z_VERSION_ERROR if the version of zlib.h and the + version of the library linked do not match, or Z_ERRNO if there is + an error reading or writing the files. */ +int def(FILE *source, FILE *dest, int level) +{ + int ret, flush; + unsigned have; + z_stream strm; + unsigned char in[CHUNK]; + unsigned char out[CHUNK]; + + /* allocate deflate state */ + strm.zalloc = Z_NULL; + strm.zfree = Z_NULL; + strm.opaque = Z_NULL; + ret = deflateInit(&strm, level); + if (ret != Z_OK) + return ret; + + /* compress until end of file */ + do { + strm.avail_in = fread(in, 1, CHUNK, source); + if (ferror(source)) { + (void)deflateEnd(&strm); + return Z_ERRNO; + } + flush = feof(source) ? Z_FINISH : Z_NO_FLUSH; + strm.next_in = in; + + /* run deflate() on input until output buffer not full, finish + compression if all of source has been read in */ + do { + strm.avail_out = CHUNK; + strm.next_out = out; + ret = deflate(&strm, flush); /* no bad return value */ + assert(ret != Z_STREAM_ERROR); /* state not clobbered */ + have = CHUNK - strm.avail_out; + if (fwrite(out, 1, have, dest) != have || ferror(dest)) { + (void)deflateEnd(&strm); + return Z_ERRNO; + } + } while (strm.avail_out == 0); + assert(strm.avail_in == 0); /* all input will be used */ + + /* done when last data in file processed */ + } while (flush != Z_FINISH); + assert(ret == Z_STREAM_END); /* stream will be complete */ + + /* clean up and return */ + (void)deflateEnd(&strm); + return Z_OK; +} + +/* Decompress from file source to file dest until stream ends or EOF. + inf() returns Z_OK on success, Z_MEM_ERROR if memory could not be + allocated for processing, Z_DATA_ERROR if the deflate data is + invalid or incomplete, Z_VERSION_ERROR if the version of zlib.h and + the version of the library linked do not match, or Z_ERRNO if there + is an error reading or writing the files. */ +int inf(FILE *source, FILE *dest) +{ + int ret; + unsigned have; + z_stream strm; + unsigned char in[CHUNK]; + unsigned char out[CHUNK]; + + /* allocate inflate state */ + strm.zalloc = Z_NULL; + strm.zfree = Z_NULL; + strm.opaque = Z_NULL; + strm.avail_in = 0; + strm.next_in = Z_NULL; + ret = inflateInit(&strm); + if (ret != Z_OK) + return ret; + + /* decompress until deflate stream ends or end of file */ + do { + strm.avail_in = fread(in, 1, CHUNK, source); + if (ferror(source)) { + (void)inflateEnd(&strm); + return Z_ERRNO; + } + if (strm.avail_in == 0) + break; + strm.next_in = in; + + /* run inflate() on input until output buffer not full */ + do { + strm.avail_out = CHUNK; + strm.next_out = out; + ret = inflate(&strm, Z_NO_FLUSH); + assert(ret != Z_STREAM_ERROR); /* state not clobbered */ + switch (ret) { + case Z_NEED_DICT: + ret = Z_DATA_ERROR; /* and fall through */ + case Z_DATA_ERROR: + case Z_MEM_ERROR: + (void)inflateEnd(&strm); + return ret; + } + have = CHUNK - strm.avail_out; + if (fwrite(out, 1, have, dest) != have || ferror(dest)) { + (void)inflateEnd(&strm); + return Z_ERRNO; + } + } while (strm.avail_out == 0); + + /* done when inflate() says it's done */ + } while (ret != Z_STREAM_END); + + /* clean up and return */ + (void)inflateEnd(&strm); + return ret == Z_STREAM_END ? Z_OK : Z_DATA_ERROR; +} + +/* report a zlib or i/o error */ +void zerr(int ret) +{ + fputs("zpipe: ", stderr); + switch (ret) { + case Z_ERRNO: + if (ferror(stdin)) + fputs("error reading stdin\n", stderr); + if (ferror(stdout)) + fputs("error writing stdout\n", stderr); + break; + case Z_STREAM_ERROR: + fputs("invalid compression level\n", stderr); + break; + case Z_DATA_ERROR: + fputs("invalid or incomplete deflate data\n", stderr); + break; + case Z_MEM_ERROR: + fputs("out of memory\n", stderr); + break; + case Z_VERSION_ERROR: + fputs("zlib version mismatch!\n", stderr); + } +} + +/* compress or decompress from stdin to stdout */ +int main(int argc, char **argv) +{ + int ret; + + /* avoid end-of-line conversions */ + SET_BINARY_MODE(stdin); + SET_BINARY_MODE(stdout); + + /* do compression if no arguments */ + if (argc == 1) { + ret = def(stdin, stdout, Z_DEFAULT_COMPRESSION); + if (ret != Z_OK) + zerr(ret); + return ret; + } + + /* do decompression if -d specified */ + else if (argc == 2 && strcmp(argv[1], "-d") == 0) { + ret = inf(stdin, stdout); + if (ret != Z_OK) + zerr(ret); + return ret; + } + + /* otherwise, report usage */ + else { + fputs("zpipe usage: zpipe [-d] < source > dest\n", stderr); + return 1; + } +} diff --git a/external/zlib/examples/zran.c b/external/zlib/examples/zran.c new file mode 100644 index 00000000..278f9ad0 --- /dev/null +++ b/external/zlib/examples/zran.c @@ -0,0 +1,409 @@ +/* zran.c -- example of zlib/gzip stream indexing and random access + * Copyright (C) 2005, 2012 Mark Adler + * For conditions of distribution and use, see copyright notice in zlib.h + Version 1.1 29 Sep 2012 Mark Adler */ + +/* Version History: + 1.0 29 May 2005 First version + 1.1 29 Sep 2012 Fix memory reallocation error + */ + +/* Illustrate the use of Z_BLOCK, inflatePrime(), and inflateSetDictionary() + for random access of a compressed file. A file containing a zlib or gzip + stream is provided on the command line. The compressed stream is decoded in + its entirety, and an index built with access points about every SPAN bytes + in the uncompressed output. The compressed file is left open, and can then + be read randomly, having to decompress on the average SPAN/2 uncompressed + bytes before getting to the desired block of data. + + An access point can be created at the start of any deflate block, by saving + the starting file offset and bit of that block, and the 32K bytes of + uncompressed data that precede that block. Also the uncompressed offset of + that block is saved to provide a referece for locating a desired starting + point in the uncompressed stream. build_index() works by decompressing the + input zlib or gzip stream a block at a time, and at the end of each block + deciding if enough uncompressed data has gone by to justify the creation of + a new access point. If so, that point is saved in a data structure that + grows as needed to accommodate the points. + + To use the index, an offset in the uncompressed data is provided, for which + the latest accees point at or preceding that offset is located in the index. + The input file is positioned to the specified location in the index, and if + necessary the first few bits of the compressed data is read from the file. + inflate is initialized with those bits and the 32K of uncompressed data, and + the decompression then proceeds until the desired offset in the file is + reached. Then the decompression continues to read the desired uncompressed + data from the file. + + Another approach would be to generate the index on demand. In that case, + requests for random access reads from the compressed data would try to use + the index, but if a read far enough past the end of the index is required, + then further index entries would be generated and added. + + There is some fair bit of overhead to starting inflation for the random + access, mainly copying the 32K byte dictionary. So if small pieces of the + file are being accessed, it would make sense to implement a cache to hold + some lookahead and avoid many calls to extract() for small lengths. + + Another way to build an index would be to use inflateCopy(). That would + not be constrained to have access points at block boundaries, but requires + more memory per access point, and also cannot be saved to file due to the + use of pointers in the state. The approach here allows for storage of the + index in a file. + */ + +#include +#include +#include +#include "zlib.h" + +#define local static + +#define SPAN 1048576L /* desired distance between access points */ +#define WINSIZE 32768U /* sliding window size */ +#define CHUNK 16384 /* file input buffer size */ + +/* access point entry */ +struct point { + off_t out; /* corresponding offset in uncompressed data */ + off_t in; /* offset in input file of first full byte */ + int bits; /* number of bits (1-7) from byte at in - 1, or 0 */ + unsigned char window[WINSIZE]; /* preceding 32K of uncompressed data */ +}; + +/* access point list */ +struct access { + int have; /* number of list entries filled in */ + int size; /* number of list entries allocated */ + struct point *list; /* allocated list */ +}; + +/* Deallocate an index built by build_index() */ +local void free_index(struct access *index) +{ + if (index != NULL) { + free(index->list); + free(index); + } +} + +/* Add an entry to the access point list. If out of memory, deallocate the + existing list and return NULL. */ +local struct access *addpoint(struct access *index, int bits, + off_t in, off_t out, unsigned left, unsigned char *window) +{ + struct point *next; + + /* if list is empty, create it (start with eight points) */ + if (index == NULL) { + index = malloc(sizeof(struct access)); + if (index == NULL) return NULL; + index->list = malloc(sizeof(struct point) << 3); + if (index->list == NULL) { + free(index); + return NULL; + } + index->size = 8; + index->have = 0; + } + + /* if list is full, make it bigger */ + else if (index->have == index->size) { + index->size <<= 1; + next = realloc(index->list, sizeof(struct point) * index->size); + if (next == NULL) { + free_index(index); + return NULL; + } + index->list = next; + } + + /* fill in entry and increment how many we have */ + next = index->list + index->have; + next->bits = bits; + next->in = in; + next->out = out; + if (left) + memcpy(next->window, window + WINSIZE - left, left); + if (left < WINSIZE) + memcpy(next->window + left, window, WINSIZE - left); + index->have++; + + /* return list, possibly reallocated */ + return index; +} + +/* Make one entire pass through the compressed stream and build an index, with + access points about every span bytes of uncompressed output -- span is + chosen to balance the speed of random access against the memory requirements + of the list, about 32K bytes per access point. Note that data after the end + of the first zlib or gzip stream in the file is ignored. build_index() + returns the number of access points on success (>= 1), Z_MEM_ERROR for out + of memory, Z_DATA_ERROR for an error in the input file, or Z_ERRNO for a + file read error. On success, *built points to the resulting index. */ +local int build_index(FILE *in, off_t span, struct access **built) +{ + int ret; + off_t totin, totout; /* our own total counters to avoid 4GB limit */ + off_t last; /* totout value of last access point */ + struct access *index; /* access points being generated */ + z_stream strm; + unsigned char input[CHUNK]; + unsigned char window[WINSIZE]; + + /* initialize inflate */ + strm.zalloc = Z_NULL; + strm.zfree = Z_NULL; + strm.opaque = Z_NULL; + strm.avail_in = 0; + strm.next_in = Z_NULL; + ret = inflateInit2(&strm, 47); /* automatic zlib or gzip decoding */ + if (ret != Z_OK) + return ret; + + /* inflate the input, maintain a sliding window, and build an index -- this + also validates the integrity of the compressed data using the check + information at the end of the gzip or zlib stream */ + totin = totout = last = 0; + index = NULL; /* will be allocated by first addpoint() */ + strm.avail_out = 0; + do { + /* get some compressed data from input file */ + strm.avail_in = fread(input, 1, CHUNK, in); + if (ferror(in)) { + ret = Z_ERRNO; + goto build_index_error; + } + if (strm.avail_in == 0) { + ret = Z_DATA_ERROR; + goto build_index_error; + } + strm.next_in = input; + + /* process all of that, or until end of stream */ + do { + /* reset sliding window if necessary */ + if (strm.avail_out == 0) { + strm.avail_out = WINSIZE; + strm.next_out = window; + } + + /* inflate until out of input, output, or at end of block -- + update the total input and output counters */ + totin += strm.avail_in; + totout += strm.avail_out; + ret = inflate(&strm, Z_BLOCK); /* return at end of block */ + totin -= strm.avail_in; + totout -= strm.avail_out; + if (ret == Z_NEED_DICT) + ret = Z_DATA_ERROR; + if (ret == Z_MEM_ERROR || ret == Z_DATA_ERROR) + goto build_index_error; + if (ret == Z_STREAM_END) + break; + + /* if at end of block, consider adding an index entry (note that if + data_type indicates an end-of-block, then all of the + uncompressed data from that block has been delivered, and none + of the compressed data after that block has been consumed, + except for up to seven bits) -- the totout == 0 provides an + entry point after the zlib or gzip header, and assures that the + index always has at least one access point; we avoid creating an + access point after the last block by checking bit 6 of data_type + */ + if ((strm.data_type & 128) && !(strm.data_type & 64) && + (totout == 0 || totout - last > span)) { + index = addpoint(index, strm.data_type & 7, totin, + totout, strm.avail_out, window); + if (index == NULL) { + ret = Z_MEM_ERROR; + goto build_index_error; + } + last = totout; + } + } while (strm.avail_in != 0); + } while (ret != Z_STREAM_END); + + /* clean up and return index (release unused entries in list) */ + (void)inflateEnd(&strm); + index->list = realloc(index->list, sizeof(struct point) * index->have); + index->size = index->have; + *built = index; + return index->size; + + /* return error */ + build_index_error: + (void)inflateEnd(&strm); + if (index != NULL) + free_index(index); + return ret; +} + +/* Use the index to read len bytes from offset into buf, return bytes read or + negative for error (Z_DATA_ERROR or Z_MEM_ERROR). If data is requested past + the end of the uncompressed data, then extract() will return a value less + than len, indicating how much as actually read into buf. This function + should not return a data error unless the file was modified since the index + was generated. extract() may also return Z_ERRNO if there is an error on + reading or seeking the input file. */ +local int extract(FILE *in, struct access *index, off_t offset, + unsigned char *buf, int len) +{ + int ret, skip; + z_stream strm; + struct point *here; + unsigned char input[CHUNK]; + unsigned char discard[WINSIZE]; + + /* proceed only if something reasonable to do */ + if (len < 0) + return 0; + + /* find where in stream to start */ + here = index->list; + ret = index->have; + while (--ret && here[1].out <= offset) + here++; + + /* initialize file and inflate state to start there */ + strm.zalloc = Z_NULL; + strm.zfree = Z_NULL; + strm.opaque = Z_NULL; + strm.avail_in = 0; + strm.next_in = Z_NULL; + ret = inflateInit2(&strm, -15); /* raw inflate */ + if (ret != Z_OK) + return ret; + ret = fseeko(in, here->in - (here->bits ? 1 : 0), SEEK_SET); + if (ret == -1) + goto extract_ret; + if (here->bits) { + ret = getc(in); + if (ret == -1) { + ret = ferror(in) ? Z_ERRNO : Z_DATA_ERROR; + goto extract_ret; + } + (void)inflatePrime(&strm, here->bits, ret >> (8 - here->bits)); + } + (void)inflateSetDictionary(&strm, here->window, WINSIZE); + + /* skip uncompressed bytes until offset reached, then satisfy request */ + offset -= here->out; + strm.avail_in = 0; + skip = 1; /* while skipping to offset */ + do { + /* define where to put uncompressed data, and how much */ + if (offset == 0 && skip) { /* at offset now */ + strm.avail_out = len; + strm.next_out = buf; + skip = 0; /* only do this once */ + } + if (offset > WINSIZE) { /* skip WINSIZE bytes */ + strm.avail_out = WINSIZE; + strm.next_out = discard; + offset -= WINSIZE; + } + else if (offset != 0) { /* last skip */ + strm.avail_out = (unsigned)offset; + strm.next_out = discard; + offset = 0; + } + + /* uncompress until avail_out filled, or end of stream */ + do { + if (strm.avail_in == 0) { + strm.avail_in = fread(input, 1, CHUNK, in); + if (ferror(in)) { + ret = Z_ERRNO; + goto extract_ret; + } + if (strm.avail_in == 0) { + ret = Z_DATA_ERROR; + goto extract_ret; + } + strm.next_in = input; + } + ret = inflate(&strm, Z_NO_FLUSH); /* normal inflate */ + if (ret == Z_NEED_DICT) + ret = Z_DATA_ERROR; + if (ret == Z_MEM_ERROR || ret == Z_DATA_ERROR) + goto extract_ret; + if (ret == Z_STREAM_END) + break; + } while (strm.avail_out != 0); + + /* if reach end of stream, then don't keep trying to get more */ + if (ret == Z_STREAM_END) + break; + + /* do until offset reached and requested data read, or stream ends */ + } while (skip); + + /* compute number of uncompressed bytes read after offset */ + ret = skip ? 0 : len - strm.avail_out; + + /* clean up and return bytes read or error */ + extract_ret: + (void)inflateEnd(&strm); + return ret; +} + +/* Demonstrate the use of build_index() and extract() by processing the file + provided on the command line, and the extracting 16K from about 2/3rds of + the way through the uncompressed output, and writing that to stdout. */ +int main(int argc, char **argv) +{ + int len; + off_t offset; + FILE *in; + struct access *index = NULL; + unsigned char buf[CHUNK]; + + /* open input file */ + if (argc != 2) { + fprintf(stderr, "usage: zran file.gz\n"); + return 1; + } + in = fopen(argv[1], "rb"); + if (in == NULL) { + fprintf(stderr, "zran: could not open %s for reading\n", argv[1]); + return 1; + } + + /* build index */ + len = build_index(in, SPAN, &index); + if (len < 0) { + fclose(in); + switch (len) { + case Z_MEM_ERROR: + fprintf(stderr, "zran: out of memory\n"); + break; + case Z_DATA_ERROR: + fprintf(stderr, "zran: compressed data error in %s\n", argv[1]); + break; + case Z_ERRNO: + fprintf(stderr, "zran: read error on %s\n", argv[1]); + break; + default: + fprintf(stderr, "zran: error %d while building index\n", len); + } + return 1; + } + fprintf(stderr, "zran: built index with %d access points\n", len); + + /* use index by reading some bytes from an arbitrary offset */ + offset = (index->list[index->have - 1].out << 1) / 3; + len = extract(in, index, offset, buf, CHUNK); + if (len < 0) + fprintf(stderr, "zran: extraction failed: %s error\n", + len == Z_MEM_ERROR ? "out of memory" : "input corrupted"); + else { + fwrite(buf, 1, len, stdout); + fprintf(stderr, "zran: extracted %d bytes at %llu\n", len, offset); + } + + /* clean up and exit */ + free_index(index); + fclose(in); + return 0; +} diff --git a/zlib/gzclose.c b/external/zlib/gzclose.c similarity index 100% rename from zlib/gzclose.c rename to external/zlib/gzclose.c diff --git a/zlib/gzguts.h b/external/zlib/gzguts.h similarity index 100% rename from zlib/gzguts.h rename to external/zlib/gzguts.h diff --git a/zlib/gzlib.c b/external/zlib/gzlib.c similarity index 100% rename from zlib/gzlib.c rename to external/zlib/gzlib.c diff --git a/zlib/gzread.c b/external/zlib/gzread.c similarity index 100% rename from zlib/gzread.c rename to external/zlib/gzread.c diff --git a/zlib/gzwrite.c b/external/zlib/gzwrite.c similarity index 100% rename from zlib/gzwrite.c rename to external/zlib/gzwrite.c diff --git a/zlib/infback.c b/external/zlib/infback.c similarity index 100% rename from zlib/infback.c rename to external/zlib/infback.c diff --git a/zlib/inffast.c b/external/zlib/inffast.c similarity index 100% rename from zlib/inffast.c rename to external/zlib/inffast.c diff --git a/zlib/inffast.h b/external/zlib/inffast.h similarity index 100% rename from zlib/inffast.h rename to external/zlib/inffast.h diff --git a/external/zlib/inffast_chunk.c b/external/zlib/inffast_chunk.c new file mode 100644 index 00000000..829a8ec3 --- /dev/null +++ b/external/zlib/inffast_chunk.c @@ -0,0 +1,379 @@ +/* inffast_chunk.c -- fast decoding + * + * (C) 1995-2013 Jean-loup Gailly and Mark Adler + * + * This software is provided 'as-is', without any express or implied + * warranty. In no event will the authors be held liable for any damages + * arising from the use of this software. + * + * Permission is granted to anyone to use this software for any purpose, + * including commercial applications, and to alter it and redistribute it + * freely, subject to the following restrictions: + * + * 1. The origin of this software must not be misrepresented; you must not + * claim that you wrote the original software. If you use this software + * in a product, an acknowledgment in the product documentation would be + * appreciated but is not required. + * 2. Altered source versions must be plainly marked as such, and must not be + * misrepresented as being the original software. + * 3. This notice may not be removed or altered from any source distribution. + * + * Jean-loup Gailly Mark Adler + * jloup@gzip.org madler@alumni.caltech.edu + * + * Copyright (C) 1995-2017 Mark Adler + * For conditions of distribution and use, see copyright notice in zlib.h + */ + +#include "zutil.h" +#include "inftrees.h" +#include "inflate.h" +#include "inffast_chunk.h" +#include "chunkcopy.h" + +#ifdef ASMINF +# pragma message("Assembler code may have bugs -- use at your own risk") +#else + +/* + Decode literal, length, and distance codes and write out the resulting + literal and match bytes until either not enough input or output is + available, an end-of-block is encountered, or a data error is encountered. + When large enough input and output buffers are supplied to inflate(), for + example, a 16K input buffer and a 64K output buffer, more than 95% of the + inflate() execution time is spent in this routine. + + Entry assumptions: + + state->mode == LEN + strm->avail_in >= INFLATE_FAST_MIN_INPUT (6 or 8 bytes) + strm->avail_out >= INFLATE_FAST_MIN_OUTPUT (258 bytes) + start >= strm->avail_out + state->bits < 8 + strm->next_out[0..strm->avail_out] does not overlap with + strm->next_in[0..strm->avail_in] + strm->state->window is allocated with an additional + CHUNKCOPY_CHUNK_SIZE-1 bytes of padding beyond strm->state->wsize + + On return, state->mode is one of: + + LEN -- ran out of enough output space or enough available input + TYPE -- reached end of block code, inflate() to interpret next block + BAD -- error in block data + + Notes: + + INFLATE_FAST_MIN_INPUT: 6 or 8 bytes + + - The maximum input bits used by a length/distance pair is 15 bits for the + length code, 5 bits for the length extra, 15 bits for the distance code, + and 13 bits for the distance extra. This totals 48 bits, or six bytes. + Therefore if strm->avail_in >= 6, then there is enough input to avoid + checking for available input while decoding. + + - The wide input data reading option reads 64 input bits at a time. Thus, + if strm->avail_in >= 8, then there is enough input to avoid checking for + available input while decoding. Reading consumes the input with: + + hold |= read64le(in) << bits; + in += 6; + bits += 48; + + reporting 6 bytes of new input because |bits| is 0..15 (2 bytes rounded + up, worst case) and 6 bytes is enough to decode as noted above. At exit, + hold &= (1U << bits) - 1 drops excess input to keep the invariant: + + (state->hold >> state->bits) == 0 + + INFLATE_FAST_MIN_OUTPUT: 258 bytes + - The maximum bytes that a single length/distance pair can output is 258 + bytes, which is the maximum length that can be coded. inflate_fast() + requires strm->avail_out >= 258 for each loop to avoid checking for + available output space while decoding. + */ +void ZLIB_INTERNAL inflate_fast_chunk_(strm, start) +z_streamp strm; +unsigned start; /* inflate()'s starting value for strm->avail_out */ +{ + struct inflate_state FAR *state; + z_const unsigned char FAR *in; /* local strm->next_in */ + z_const unsigned char FAR *last; /* have enough input while in < last */ + unsigned char FAR *out; /* local strm->next_out */ + unsigned char FAR *beg; /* inflate()'s initial strm->next_out */ + unsigned char FAR *end; /* while out < end, enough space available */ + unsigned char FAR *limit; /* safety limit for chunky copies */ +#ifdef INFLATE_STRICT + unsigned dmax; /* maximum distance from zlib header */ +#endif + unsigned wsize; /* window size or zero if not using window */ + unsigned whave; /* valid bytes in the window */ + unsigned wnext; /* window write index */ + unsigned char FAR *window; /* allocated sliding window, if wsize != 0 */ + inflate_holder_t hold; /* local strm->hold */ + unsigned bits; /* local strm->bits */ + code const FAR *lcode; /* local strm->lencode */ + code const FAR *dcode; /* local strm->distcode */ + unsigned lmask; /* mask for first level of length codes */ + unsigned dmask; /* mask for first level of distance codes */ + code here; /* retrieved table entry */ + unsigned op; /* code bits, operation, extra bits, or */ + /* window position, window bytes to copy */ + unsigned len; /* match length, unused bytes */ + unsigned dist; /* match distance */ + unsigned char FAR *from; /* where to copy match from */ + + /* copy state to local variables */ + state = (struct inflate_state FAR *)strm->state; + in = strm->next_in; + last = in + (strm->avail_in - (INFLATE_FAST_MIN_INPUT - 1)); + out = strm->next_out; + beg = out - (start - strm->avail_out); + end = out + (strm->avail_out - (INFLATE_FAST_MIN_OUTPUT - 1)); + limit = out + strm->avail_out; +#ifdef INFLATE_STRICT + dmax = state->dmax; +#endif + wsize = state->wsize; + whave = state->whave; + wnext = (state->wnext == 0 && whave >= wsize) ? wsize : state->wnext; + window = state->window; + hold = state->hold; + bits = state->bits; + lcode = state->lencode; + dcode = state->distcode; + lmask = (1U << state->lenbits) - 1; + dmask = (1U << state->distbits) - 1; + + /* decode literals and length/distances until end-of-block or not enough + input data or output space */ + do { + if (bits < 15) { +#ifdef INFLATE_CHUNK_READ_64LE + hold |= read64le(in) << bits; + in += 6; + bits += 48; +#else + hold += (unsigned long)(*in++) << bits; + bits += 8; + hold += (unsigned long)(*in++) << bits; + bits += 8; +#endif + } + here = lcode[hold & lmask]; + dolen: + op = (unsigned)(here.bits); + hold >>= op; + bits -= op; + op = (unsigned)(here.op); + if (op == 0) { /* literal */ + Tracevv((stderr, here.val >= 0x20 && here.val < 0x7f ? + "inflate: literal '%c'\n" : + "inflate: literal 0x%02x\n", here.val)); + *out++ = (unsigned char)(here.val); + } + else if (op & 16) { /* length base */ + len = (unsigned)(here.val); + op &= 15; /* number of extra bits */ + if (op) { + if (bits < op) { +#ifdef INFLATE_CHUNK_READ_64LE + hold |= read64le(in) << bits; + in += 6; + bits += 48; +#else + hold += (unsigned long)(*in++) << bits; + bits += 8; +#endif + } + len += (unsigned)hold & ((1U << op) - 1); + hold >>= op; + bits -= op; + } + Tracevv((stderr, "inflate: length %u\n", len)); + if (bits < 15) { +#ifdef INFLATE_CHUNK_READ_64LE + hold |= read64le(in) << bits; + in += 6; + bits += 48; +#else + hold += (unsigned long)(*in++) << bits; + bits += 8; + hold += (unsigned long)(*in++) << bits; + bits += 8; +#endif + } + here = dcode[hold & dmask]; + dodist: + op = (unsigned)(here.bits); + hold >>= op; + bits -= op; + op = (unsigned)(here.op); + if (op & 16) { /* distance base */ + dist = (unsigned)(here.val); + op &= 15; /* number of extra bits */ + if (bits < op) { +#ifdef INFLATE_CHUNK_READ_64LE + hold |= read64le(in) << bits; + in += 6; + bits += 48; +#else + hold += (unsigned long)(*in++) << bits; + bits += 8; + if (bits < op) { + hold += (unsigned long)(*in++) << bits; + bits += 8; + } +#endif + } + dist += (unsigned)hold & ((1U << op) - 1); +#ifdef INFLATE_STRICT + if (dist > dmax) { + strm->msg = (char *)"invalid distance too far back"; + state->mode = BAD; + break; + } +#endif + hold >>= op; + bits -= op; + Tracevv((stderr, "inflate: distance %u\n", dist)); + op = (unsigned)(out - beg); /* max distance in output */ + if (dist > op) { /* see if copy from window */ + op = dist - op; /* distance back in window */ + if (op > whave) { + if (state->sane) { + strm->msg = + (char *)"invalid distance too far back"; + state->mode = BAD; + break; + } +#ifdef INFLATE_ALLOW_INVALID_DISTANCE_TOOFAR_ARRR + if (len <= op - whave) { + do { + *out++ = 0; + } while (--len); + continue; + } + len -= op - whave; + do { + *out++ = 0; + } while (--op > whave); + if (op == 0) { + from = out - dist; + do { + *out++ = *from++; + } while (--len); + continue; + } +#endif + } + from = window; + if (wnext >= op) { /* contiguous in window */ + from += wnext - op; + } + else { /* wrap around window */ + op -= wnext; + from += wsize - op; + if (op < len) { /* some from end of window */ + len -= op; + out = chunkcopy_safe(out, from, op, limit); + from = window; /* more from start of window */ + op = wnext; + /* This (rare) case can create a situation where + the first chunkcopy below must be checked. + */ + } + } + if (op < len) { /* still need some from output */ + out = chunkcopy_safe(out, from, op, limit); + len -= op; + /* When dist is small the amount of data that can be + copied from the window is also small, and progress + towards the dangerous end of the output buffer is + also small. This means that for trivial memsets and + for chunkunroll_relaxed() a safety check is + unnecessary. However, these conditions may not be + entered at all, and in that case it's possible that + the main copy is near the end. + */ + out = chunkunroll_relaxed(out, &dist, &len); + out = chunkcopy_safe_ugly(out, dist, len, limit); + } else { + /* from points to window, so there is no risk of + overlapping pointers requiring memset-like behaviour + */ + out = chunkcopy_safe(out, from, len, limit); + } + } + else { + /* Whole reference is in range of current output. No + range checks are necessary because we start with room + for at least 258 bytes of output, so unroll and roundoff + operations can write beyond `out+len` so long as they + stay within 258 bytes of `out`. + */ + out = chunkcopy_lapped_relaxed(out, dist, len); + } + } + else if ((op & 64) == 0) { /* 2nd level distance code */ + here = dcode[here.val + (hold & ((1U << op) - 1))]; + goto dodist; + } + else { + strm->msg = (char *)"invalid distance code"; + state->mode = BAD; + break; + } + } + else if ((op & 64) == 0) { /* 2nd level length code */ + here = lcode[here.val + (hold & ((1U << op) - 1))]; + goto dolen; + } + else if (op & 32) { /* end-of-block */ + Tracevv((stderr, "inflate: end of block\n")); + state->mode = TYPE; + break; + } + else { + strm->msg = (char *)"invalid literal/length code"; + state->mode = BAD; + break; + } + } while (in < last && out < end); + + /* return unused bytes (on entry, bits < 8, so in won't go too far back) */ + len = bits >> 3; + in -= len; + bits -= len << 3; + hold &= (1U << bits) - 1; + + /* update state and return */ + strm->next_in = in; + strm->next_out = out; + strm->avail_in = (unsigned)(in < last ? + (INFLATE_FAST_MIN_INPUT - 1) + (last - in) : + (INFLATE_FAST_MIN_INPUT - 1) - (in - last)); + strm->avail_out = (unsigned)(out < end ? + (INFLATE_FAST_MIN_OUTPUT - 1) + (end - out) : + (INFLATE_FAST_MIN_OUTPUT - 1) - (out - end)); + state->hold = hold; + state->bits = bits; + + Assert((state->hold >> state->bits) == 0, "invalid input data state"); + return; +} + +/* + inflate_fast() speedups that turned out slower (on a PowerPC G3 750CXe): + - Using bit fields for code structure + - Different op definition to avoid & for extra bits (do & for table bits) + - Three separate decoding do-loops for direct, window, and wnext == 0 + - Special case for distance > 1 copies to do overlapped load and store copy + - Explicit branch predictions (based on measured branch probabilities) + - Deferring match copy and interspersed it with decoding subsequent codes + - Swapping literal/length else + - Swapping window/direct else + - Larger unrolled copy loops (three is about right) + - Moving len -= 3 statement into middle of loop + */ + +#endif /* !ASMINF */ diff --git a/external/zlib/inffast_chunk.h b/external/zlib/inffast_chunk.h new file mode 100644 index 00000000..de6aa0d8 --- /dev/null +++ b/external/zlib/inffast_chunk.h @@ -0,0 +1,48 @@ +/* inffast_chunk.h -- header to use inffast_chunk.c + * + * (C) 1995-2013 Jean-loup Gailly and Mark Adler + * + * This software is provided 'as-is', without any express or implied + * warranty. In no event will the authors be held liable for any damages + * arising from the use of this software. + * + * Permission is granted to anyone to use this software for any purpose, + * including commercial applications, and to alter it and redistribute it + * freely, subject to the following restrictions: + * + * 1. The origin of this software must not be misrepresented; you must not + * claim that you wrote the original software. If you use this software + * in a product, an acknowledgment in the product documentation would be + * appreciated but is not required. + * 2. Altered source versions must be plainly marked as such, and must not be + * misrepresented as being the original software. + * 3. This notice may not be removed or altered from any source distribution. + * + * Jean-loup Gailly Mark Adler + * jloup@gzip.org madler@alumni.caltech.edu + * + * Copyright (C) 1995-2003, 2010 Mark Adler + * Copyright (C) 2017 ARM, Inc. + * For conditions of distribution and use, see copyright notice in zlib.h + */ + +/* WARNING: this file should *not* be used by applications. It is + part of the implementation of the compression library and is + subject to change. Applications should only use zlib.h. + */ + +#include "inffast.h" + +/* INFLATE_FAST_MIN_INPUT: the minimum number of input bytes needed so that + we can safely call inflate_fast() with only one up-front bounds check. One + length/distance code pair (15 bits for the length code, 5 bits for length + extra, 15 bits for the distance code, 13 bits for distance extra) requires + reading up to 48 input bits (6 bytes). The wide input data reading option + requires a little endian machine, and reads 64 input bits (8 bytes). +*/ +#ifdef INFLATE_CHUNK_READ_64LE +#undef INFLATE_FAST_MIN_INPUT +#define INFLATE_FAST_MIN_INPUT 8 +#endif + +void ZLIB_INTERNAL inflate_fast_chunk_ OF((z_streamp strm, unsigned start)); diff --git a/zlib/inffixed.h b/external/zlib/inffixed.h similarity index 100% rename from zlib/inffixed.h rename to external/zlib/inffixed.h diff --git a/zlib/inflate.c b/external/zlib/inflate.c similarity index 100% rename from zlib/inflate.c rename to external/zlib/inflate.c diff --git a/zlib/inflate.h b/external/zlib/inflate.h similarity index 100% rename from zlib/inflate.h rename to external/zlib/inflate.h diff --git a/zlib/inftrees.c b/external/zlib/inftrees.c similarity index 100% rename from zlib/inftrees.c rename to external/zlib/inftrees.c diff --git a/zlib/inftrees.h b/external/zlib/inftrees.h similarity index 100% rename from zlib/inftrees.h rename to external/zlib/inftrees.h diff --git a/external/zlib/make_vms.com b/external/zlib/make_vms.com new file mode 100644 index 00000000..65e9d0cb --- /dev/null +++ b/external/zlib/make_vms.com @@ -0,0 +1,867 @@ +$! make libz under VMS written by +$! Martin P.J. Zinser +$! +$! In case of problems with the install you might contact me at +$! zinser@zinser.no-ip.info(preferred) or +$! martin.zinser@eurexchange.com (work) +$! +$! Make procedure history for Zlib +$! +$!------------------------------------------------------------------------------ +$! Version history +$! 0.01 20060120 First version to receive a number +$! 0.02 20061008 Adapt to new Makefile.in +$! 0.03 20091224 Add support for large file check +$! 0.04 20100110 Add new gzclose, gzlib, gzread, gzwrite +$! 0.05 20100221 Exchange zlibdefs.h by zconf.h.in +$! 0.06 20120111 Fix missing amiss_err, update zconf_h.in, fix new exmples +$! subdir path, update module search in makefile.in +$! 0.07 20120115 Triggered by work done by Alexey Chupahin completly redesigned +$! shared image creation +$! 0.08 20120219 Make it work on VAX again, pre-load missing symbols to shared +$! image +$! 0.09 20120305 SMS. P1 sets builder ("MMK", "MMS", " " (built-in)). +$! "" -> automatic, preference: MMK, MMS, built-in. +$! +$ on error then goto err_exit +$! +$ true = 1 +$ false = 0 +$ tmpnam = "temp_" + f$getjpi("","pid") +$ tt = tmpnam + ".txt" +$ tc = tmpnam + ".c" +$ th = tmpnam + ".h" +$ define/nolog tconfig 'th' +$ its_decc = false +$ its_vaxc = false +$ its_gnuc = false +$ s_case = False +$! +$! Setup variables holding "config" information +$! +$ Make = "''p1'" +$ name = "Zlib" +$ version = "?.?.?" +$ v_string = "ZLIB_VERSION" +$ v_file = "zlib.h" +$ ccopt = "/include = []" +$ lopts = "" +$ dnsrl = "" +$ aconf_in_file = "zconf.h.in#zconf.h_in#zconf_h.in" +$ conf_check_string = "" +$ linkonly = false +$ optfile = name + ".opt" +$ mapfile = name + ".map" +$ libdefs = "" +$ vax = f$getsyi("HW_MODEL").lt.1024 +$ axp = f$getsyi("HW_MODEL").ge.1024 .and. f$getsyi("HW_MODEL").lt.4096 +$ ia64 = f$getsyi("HW_MODEL").ge.4096 +$! +$! 2012-03-05 SMS. +$! Why is this needed? And if it is needed, why not simply ".not. vax"? +$! +$!!! if axp .or. ia64 then set proc/parse=extended +$! +$ whoami = f$parse(f$environment("Procedure"),,,,"NO_CONCEAL") +$ mydef = F$parse(whoami,,,"DEVICE") +$ mydir = f$parse(whoami,,,"DIRECTORY") - "][" +$ myproc = f$parse(whoami,,,"Name") + f$parse(whoami,,,"type") +$! +$! Check for MMK/MMS +$! +$ if (Make .eqs. "") +$ then +$ If F$Search ("Sys$System:MMS.EXE") .nes. "" Then Make = "MMS" +$ If F$Type (MMK) .eqs. "STRING" Then Make = "MMK" +$ else +$ Make = f$edit( Make, "trim") +$ endif +$! +$ gosub find_version +$! +$ open/write topt tmp.opt +$ open/write optf 'optfile' +$! +$ gosub check_opts +$! +$! Look for the compiler used +$! +$ gosub check_compiler +$ close topt +$ close optf +$! +$ if its_decc +$ then +$ ccopt = "/prefix=all" + ccopt +$ if f$trnlnm("SYS") .eqs. "" +$ then +$ if axp +$ then +$ define sys sys$library: +$ else +$ ccopt = "/decc" + ccopt +$ define sys decc$library_include: +$ endif +$ endif +$! +$! 2012-03-05 SMS. +$! Why /NAMES = AS_IS? Why not simply ".not. vax"? And why not on VAX? +$! +$ if axp .or. ia64 +$ then +$ ccopt = ccopt + "/name=as_is/opt=(inline=speed)" +$ s_case = true +$ endif +$ endif +$ if its_vaxc .or. its_gnuc +$ then +$ if f$trnlnm("SYS").eqs."" then define sys sys$library: +$ endif +$! +$! Build a fake configure input header +$! +$ open/write conf_hin config.hin +$ write conf_hin "#undef _LARGEFILE64_SOURCE" +$ close conf_hin +$! +$! +$ i = 0 +$FIND_ACONF: +$ fname = f$element(i,"#",aconf_in_file) +$ if fname .eqs. "#" then goto AMISS_ERR +$ if f$search(fname) .eqs. "" +$ then +$ i = i + 1 +$ goto find_aconf +$ endif +$ open/read/err=aconf_err aconf_in 'fname' +$ open/write aconf zconf.h +$ACONF_LOOP: +$ read/end_of_file=aconf_exit aconf_in line +$ work = f$edit(line, "compress,trim") +$ if f$extract(0,6,work) .nes. "#undef" +$ then +$ if f$extract(0,12,work) .nes. "#cmakedefine" +$ then +$ write aconf line +$ endif +$ else +$ cdef = f$element(1," ",work) +$ gosub check_config +$ endif +$ goto aconf_loop +$ACONF_EXIT: +$ write aconf "" +$ write aconf "/* VMS specifics added by make_vms.com: */" +$ write aconf "#define VMS 1" +$ write aconf "#include " +$ write aconf "#include " +$ write aconf "#ifdef _LARGEFILE" +$ write aconf "# define off64_t __off64_t" +$ write aconf "# define fopen64 fopen" +$ write aconf "# define fseeko64 fseeko" +$ write aconf "# define lseek64 lseek" +$ write aconf "# define ftello64 ftell" +$ write aconf "#endif" +$ write aconf "#if !defined( __VAX) && (__CRTL_VER >= 70312000)" +$ write aconf "# define HAVE_VSNPRINTF" +$ write aconf "#endif" +$ close aconf_in +$ close aconf +$ if f$search("''th'") .nes. "" then delete 'th';* +$! Build the thing plain or with mms +$! +$ write sys$output "Compiling Zlib sources ..." +$ if make.eqs."" +$ then +$ if (f$search( "example.obj;*") .nes. "") then delete example.obj;* +$ if (f$search( "minigzip.obj;*") .nes. "") then delete minigzip.obj;* +$ CALL MAKE adler32.OBJ "CC ''CCOPT' adler32" - + adler32.c zlib.h zconf.h +$ CALL MAKE compress.OBJ "CC ''CCOPT' compress" - + compress.c zlib.h zconf.h +$ CALL MAKE crc32.OBJ "CC ''CCOPT' crc32" - + crc32.c zlib.h zconf.h +$ CALL MAKE deflate.OBJ "CC ''CCOPT' deflate" - + deflate.c deflate.h zutil.h zlib.h zconf.h +$ CALL MAKE gzclose.OBJ "CC ''CCOPT' gzclose" - + gzclose.c zutil.h zlib.h zconf.h +$ CALL MAKE gzlib.OBJ "CC ''CCOPT' gzlib" - + gzlib.c zutil.h zlib.h zconf.h +$ CALL MAKE gzread.OBJ "CC ''CCOPT' gzread" - + gzread.c zutil.h zlib.h zconf.h +$ CALL MAKE gzwrite.OBJ "CC ''CCOPT' gzwrite" - + gzwrite.c zutil.h zlib.h zconf.h +$ CALL MAKE infback.OBJ "CC ''CCOPT' infback" - + infback.c zutil.h inftrees.h inflate.h inffast.h inffixed.h +$ CALL MAKE inffast.OBJ "CC ''CCOPT' inffast" - + inffast.c zutil.h zlib.h zconf.h inffast.h +$ CALL MAKE inflate.OBJ "CC ''CCOPT' inflate" - + inflate.c zutil.h zlib.h zconf.h infblock.h +$ CALL MAKE inftrees.OBJ "CC ''CCOPT' inftrees" - + inftrees.c zutil.h zlib.h zconf.h inftrees.h +$ CALL MAKE trees.OBJ "CC ''CCOPT' trees" - + trees.c deflate.h zutil.h zlib.h zconf.h +$ CALL MAKE uncompr.OBJ "CC ''CCOPT' uncompr" - + uncompr.c zlib.h zconf.h +$ CALL MAKE zutil.OBJ "CC ''CCOPT' zutil" - + zutil.c zutil.h zlib.h zconf.h +$ write sys$output "Building Zlib ..." +$ CALL MAKE libz.OLB "lib/crea libz.olb *.obj" *.OBJ +$ write sys$output "Building example..." +$ CALL MAKE example.OBJ "CC ''CCOPT' [.test]example" - + [.test]example.c zlib.h zconf.h +$ call make example.exe "LINK example,libz.olb/lib" example.obj libz.olb +$ write sys$output "Building minigzip..." +$ CALL MAKE minigzip.OBJ "CC ''CCOPT' [.test]minigzip" - + [.test]minigzip.c zlib.h zconf.h +$ call make minigzip.exe - + "LINK minigzip,libz.olb/lib" - + minigzip.obj libz.olb +$ else +$ gosub crea_mms +$ write sys$output "Make ''name' ''version' with ''Make' " +$ 'make' +$ endif +$! +$! Create shareable image +$! +$ gosub crea_olist +$ write sys$output "Creating libzshr.exe" +$ call map_2_shopt 'mapfile' 'optfile' +$ LINK_'lopts'/SHARE=libzshr.exe modules.opt/opt,'optfile'/opt +$ write sys$output "Zlib build completed" +$ delete/nolog tmp.opt;* +$ exit +$AMISS_ERR: +$ write sys$output "No source for config.hin found." +$ write sys$output "Tried any of ''aconf_in_file'" +$ goto err_exit +$CC_ERR: +$ write sys$output "C compiler required to build ''name'" +$ goto err_exit +$ERR_EXIT: +$ set message/facil/ident/sever/text +$ close/nolog optf +$ close/nolog topt +$ close/nolog aconf_in +$ close/nolog aconf +$ close/nolog out +$ close/nolog min +$ close/nolog mod +$ close/nolog h_in +$ write sys$output "Exiting..." +$ exit 2 +$! +$! +$MAKE: SUBROUTINE !SUBROUTINE TO CHECK DEPENDENCIES +$ V = 'F$Verify(0) +$! P1 = What we are trying to make +$! P2 = Command to make it +$! P3 - P8 What it depends on +$ +$ If F$Search(P1) .Eqs. "" Then Goto Makeit +$ Time = F$CvTime(F$File(P1,"RDT")) +$arg=3 +$Loop: +$ Argument = P'arg +$ If Argument .Eqs. "" Then Goto Exit +$ El=0 +$Loop2: +$ File = F$Element(El," ",Argument) +$ If File .Eqs. " " Then Goto Endl +$ AFile = "" +$Loop3: +$ OFile = AFile +$ AFile = F$Search(File) +$ If AFile .Eqs. "" .Or. AFile .Eqs. OFile Then Goto NextEl +$ If F$CvTime(F$File(AFile,"RDT")) .Ges. Time Then Goto Makeit +$ Goto Loop3 +$NextEL: +$ El = El + 1 +$ Goto Loop2 +$EndL: +$ arg=arg+1 +$ If arg .Le. 8 Then Goto Loop +$ Goto Exit +$ +$Makeit: +$ VV=F$VERIFY(0) +$ write sys$output P2 +$ 'P2 +$ VV='F$Verify(VV) +$Exit: +$ If V Then Set Verify +$ENDSUBROUTINE +$!------------------------------------------------------------------------------ +$! +$! Check command line options and set symbols accordingly +$! +$!------------------------------------------------------------------------------ +$! Version history +$! 0.01 20041206 First version to receive a number +$! 0.02 20060126 Add new "HELP" target +$ CHECK_OPTS: +$ i = 1 +$ OPT_LOOP: +$ if i .lt. 9 +$ then +$ cparm = f$edit(p'i',"upcase") +$! +$! Check if parameter actually contains something +$! +$ if f$edit(cparm,"trim") .nes. "" +$ then +$ if cparm .eqs. "DEBUG" +$ then +$ ccopt = ccopt + "/noopt/deb" +$ lopts = lopts + "/deb" +$ endif +$ if f$locate("CCOPT=",cparm) .lt. f$length(cparm) +$ then +$ start = f$locate("=",cparm) + 1 +$ len = f$length(cparm) - start +$ ccopt = ccopt + f$extract(start,len,cparm) +$ if f$locate("AS_IS",f$edit(ccopt,"UPCASE")) .lt. f$length(ccopt) - + then s_case = true +$ endif +$ if cparm .eqs. "LINK" then linkonly = true +$ if f$locate("LOPTS=",cparm) .lt. f$length(cparm) +$ then +$ start = f$locate("=",cparm) + 1 +$ len = f$length(cparm) - start +$ lopts = lopts + f$extract(start,len,cparm) +$ endif +$ if f$locate("CC=",cparm) .lt. f$length(cparm) +$ then +$ start = f$locate("=",cparm) + 1 +$ len = f$length(cparm) - start +$ cc_com = f$extract(start,len,cparm) + if (cc_com .nes. "DECC") .and. - + (cc_com .nes. "VAXC") .and. - + (cc_com .nes. "GNUC") +$ then +$ write sys$output "Unsupported compiler choice ''cc_com' ignored" +$ write sys$output "Use DECC, VAXC, or GNUC instead" +$ else +$ if cc_com .eqs. "DECC" then its_decc = true +$ if cc_com .eqs. "VAXC" then its_vaxc = true +$ if cc_com .eqs. "GNUC" then its_gnuc = true +$ endif +$ endif +$ if f$locate("MAKE=",cparm) .lt. f$length(cparm) +$ then +$ start = f$locate("=",cparm) + 1 +$ len = f$length(cparm) - start +$ mmks = f$extract(start,len,cparm) +$ if (mmks .eqs. "MMK") .or. (mmks .eqs. "MMS") +$ then +$ make = mmks +$ else +$ write sys$output "Unsupported make choice ''mmks' ignored" +$ write sys$output "Use MMK or MMS instead" +$ endif +$ endif +$ if cparm .eqs. "HELP" then gosub bhelp +$ endif +$ i = i + 1 +$ goto opt_loop +$ endif +$ return +$!------------------------------------------------------------------------------ +$! +$! Look for the compiler used +$! +$! Version history +$! 0.01 20040223 First version to receive a number +$! 0.02 20040229 Save/set value of decc$no_rooted_search_lists +$! 0.03 20060202 Extend handling of GNU C +$! 0.04 20090402 Compaq -> hp +$CHECK_COMPILER: +$ if (.not. (its_decc .or. its_vaxc .or. its_gnuc)) +$ then +$ its_decc = (f$search("SYS$SYSTEM:DECC$COMPILER.EXE") .nes. "") +$ its_vaxc = .not. its_decc .and. (F$Search("SYS$System:VAXC.Exe") .nes. "") +$ its_gnuc = .not. (its_decc .or. its_vaxc) .and. (f$trnlnm("gnu_cc") .nes. "") +$ endif +$! +$! Exit if no compiler available +$! +$ if (.not. (its_decc .or. its_vaxc .or. its_gnuc)) +$ then goto CC_ERR +$ else +$ if its_decc +$ then +$ write sys$output "CC compiler check ... hp C" +$ if f$trnlnm("decc$no_rooted_search_lists") .nes. "" +$ then +$ dnrsl = f$trnlnm("decc$no_rooted_search_lists") +$ endif +$ define/nolog decc$no_rooted_search_lists 1 +$ else +$ if its_vaxc then write sys$output "CC compiler check ... VAX C" +$ if its_gnuc +$ then +$ write sys$output "CC compiler check ... GNU C" +$ if f$trnlnm(topt) then write topt "gnu_cc:[000000]gcclib.olb/lib" +$ if f$trnlnm(optf) then write optf "gnu_cc:[000000]gcclib.olb/lib" +$ cc = "gcc" +$ endif +$ if f$trnlnm(topt) then write topt "sys$share:vaxcrtl.exe/share" +$ if f$trnlnm(optf) then write optf "sys$share:vaxcrtl.exe/share" +$ endif +$ endif +$ return +$!------------------------------------------------------------------------------ +$! +$! If MMS/MMK are available dump out the descrip.mms if required +$! +$CREA_MMS: +$ write sys$output "Creating descrip.mms..." +$ create descrip.mms +$ open/append out descrip.mms +$ copy sys$input: out +$ deck +# descrip.mms: MMS description file for building zlib on VMS +# written by Martin P.J. Zinser +# + +OBJS = adler32.obj, compress.obj, crc32.obj, gzclose.obj, gzlib.obj\ + gzread.obj, gzwrite.obj, uncompr.obj, infback.obj\ + deflate.obj, trees.obj, zutil.obj, inflate.obj, \ + inftrees.obj, inffast.obj + +$ eod +$ write out "CFLAGS=", ccopt +$ write out "LOPTS=", lopts +$ write out "all : example.exe minigzip.exe libz.olb" +$ copy sys$input: out +$ deck + @ write sys$output " Example applications available" + +libz.olb : libz.olb($(OBJS)) + @ write sys$output " libz available" + +example.exe : example.obj libz.olb + link $(LOPTS) example,libz.olb/lib + +minigzip.exe : minigzip.obj libz.olb + link $(LOPTS) minigzip,libz.olb/lib + +clean : + delete *.obj;*,libz.olb;*,*.opt;*,*.exe;* + + +# Other dependencies. +adler32.obj : adler32.c zutil.h zlib.h zconf.h +compress.obj : compress.c zlib.h zconf.h +crc32.obj : crc32.c zutil.h zlib.h zconf.h +deflate.obj : deflate.c deflate.h zutil.h zlib.h zconf.h +example.obj : [.test]example.c zlib.h zconf.h +gzclose.obj : gzclose.c zutil.h zlib.h zconf.h +gzlib.obj : gzlib.c zutil.h zlib.h zconf.h +gzread.obj : gzread.c zutil.h zlib.h zconf.h +gzwrite.obj : gzwrite.c zutil.h zlib.h zconf.h +inffast.obj : inffast.c zutil.h zlib.h zconf.h inftrees.h inffast.h +inflate.obj : inflate.c zutil.h zlib.h zconf.h +inftrees.obj : inftrees.c zutil.h zlib.h zconf.h inftrees.h +minigzip.obj : [.test]minigzip.c zlib.h zconf.h +trees.obj : trees.c deflate.h zutil.h zlib.h zconf.h +uncompr.obj : uncompr.c zlib.h zconf.h +zutil.obj : zutil.c zutil.h zlib.h zconf.h +infback.obj : infback.c zutil.h inftrees.h inflate.h inffast.h inffixed.h +$ eod +$ close out +$ return +$!------------------------------------------------------------------------------ +$! +$! Read list of core library sources from makefile.in and create options +$! needed to build shareable image +$! +$CREA_OLIST: +$ open/read min makefile.in +$ open/write mod modules.opt +$ src_check_list = "OBJZ =#OBJG =" +$MRLOOP: +$ read/end=mrdone min rec +$ i = 0 +$SRC_CHECK_LOOP: +$ src_check = f$element(i, "#", src_check_list) +$ i = i+1 +$ if src_check .eqs. "#" then goto mrloop +$ if (f$extract(0,6,rec) .nes. src_check) then goto src_check_loop +$ rec = rec - src_check +$ gosub extra_filnam +$ if (f$element(1,"\",rec) .eqs. "\") then goto mrloop +$MRSLOOP: +$ read/end=mrdone min rec +$ gosub extra_filnam +$ if (f$element(1,"\",rec) .nes. "\") then goto mrsloop +$MRDONE: +$ close min +$ close mod +$ return +$!------------------------------------------------------------------------------ +$! +$! Take record extracted in crea_olist and split it into single filenames +$! +$EXTRA_FILNAM: +$ myrec = f$edit(rec - "\", "trim,compress") +$ i = 0 +$FELOOP: +$ srcfil = f$element(i," ", myrec) +$ if (srcfil .nes. " ") +$ then +$ write mod f$parse(srcfil,,,"NAME"), ".obj" +$ i = i + 1 +$ goto feloop +$ endif +$ return +$!------------------------------------------------------------------------------ +$! +$! Find current Zlib version number +$! +$FIND_VERSION: +$ open/read h_in 'v_file' +$hloop: +$ read/end=hdone h_in rec +$ rec = f$edit(rec,"TRIM") +$ if (f$extract(0,1,rec) .nes. "#") then goto hloop +$ rec = f$edit(rec - "#", "TRIM") +$ if f$element(0," ",rec) .nes. "define" then goto hloop +$ if f$element(1," ",rec) .eqs. v_string +$ then +$ version = 'f$element(2," ",rec)' +$ goto hdone +$ endif +$ goto hloop +$hdone: +$ close h_in +$ return +$!------------------------------------------------------------------------------ +$! +$CHECK_CONFIG: +$! +$ in_ldef = f$locate(cdef,libdefs) +$ if (in_ldef .lt. f$length(libdefs)) +$ then +$ write aconf "#define ''cdef' 1" +$ libdefs = f$extract(0,in_ldef,libdefs) + - + f$extract(in_ldef + f$length(cdef) + 1, - + f$length(libdefs) - in_ldef - f$length(cdef) - 1, - + libdefs) +$ else +$ if (f$type('cdef') .eqs. "INTEGER") +$ then +$ write aconf "#define ''cdef' ", 'cdef' +$ else +$ if (f$type('cdef') .eqs. "STRING") +$ then +$ write aconf "#define ''cdef' ", """", '''cdef'', """" +$ else +$ gosub check_cc_def +$ endif +$ endif +$ endif +$ return +$!------------------------------------------------------------------------------ +$! +$! Check if this is a define relating to the properties of the C/C++ +$! compiler +$! +$ CHECK_CC_DEF: +$ if (cdef .eqs. "_LARGEFILE64_SOURCE") +$ then +$ copy sys$input: 'tc' +$ deck +#include "tconfig" +#define _LARGEFILE +#include + +int main(){ +FILE *fp; + fp = fopen("temp.txt","r"); + fseeko(fp,1,SEEK_SET); + fclose(fp); +} + +$ eod +$ test_inv = false +$ comm_h = false +$ gosub cc_prop_check +$ return +$ endif +$ write aconf "/* ", line, " */" +$ return +$!------------------------------------------------------------------------------ +$! +$! Check for properties of C/C++ compiler +$! +$! Version history +$! 0.01 20031020 First version to receive a number +$! 0.02 20031022 Added logic for defines with value +$! 0.03 20040309 Make sure local config file gets not deleted +$! 0.04 20041230 Also write include for configure run +$! 0.05 20050103 Add processing of "comment defines" +$CC_PROP_CHECK: +$ cc_prop = true +$ is_need = false +$ is_need = (f$extract(0,4,cdef) .eqs. "NEED") .or. (test_inv .eq. true) +$ if f$search(th) .eqs. "" then create 'th' +$ set message/nofac/noident/nosever/notext +$ on error then continue +$ cc 'tmpnam' +$ if .not. ($status) then cc_prop = false +$ on error then continue +$! The headers might lie about the capabilities of the RTL +$ link 'tmpnam',tmp.opt/opt +$ if .not. ($status) then cc_prop = false +$ set message/fac/ident/sever/text +$ on error then goto err_exit +$ delete/nolog 'tmpnam'.*;*/exclude='th' +$ if (cc_prop .and. .not. is_need) .or. - + (.not. cc_prop .and. is_need) +$ then +$ write sys$output "Checking for ''cdef'... yes" +$ if f$type('cdef_val'_yes) .nes. "" +$ then +$ if f$type('cdef_val'_yes) .eqs. "INTEGER" - + then call write_config f$fao("#define !AS !UL",cdef,'cdef_val'_yes) +$ if f$type('cdef_val'_yes) .eqs. "STRING" - + then call write_config f$fao("#define !AS !AS",cdef,'cdef_val'_yes) +$ else +$ call write_config f$fao("#define !AS 1",cdef) +$ endif +$ if (cdef .eqs. "HAVE_FSEEKO") .or. (cdef .eqs. "_LARGE_FILES") .or. - + (cdef .eqs. "_LARGEFILE64_SOURCE") then - + call write_config f$string("#define _LARGEFILE 1") +$ else +$ write sys$output "Checking for ''cdef'... no" +$ if (comm_h) +$ then + call write_config f$fao("/* !AS */",line) +$ else +$ if f$type('cdef_val'_no) .nes. "" +$ then +$ if f$type('cdef_val'_no) .eqs. "INTEGER" - + then call write_config f$fao("#define !AS !UL",cdef,'cdef_val'_no) +$ if f$type('cdef_val'_no) .eqs. "STRING" - + then call write_config f$fao("#define !AS !AS",cdef,'cdef_val'_no) +$ else +$ call write_config f$fao("#undef !AS",cdef) +$ endif +$ endif +$ endif +$ return +$!------------------------------------------------------------------------------ +$! +$! Check for properties of C/C++ compiler with multiple result values +$! +$! Version history +$! 0.01 20040127 First version +$! 0.02 20050103 Reconcile changes from cc_prop up to version 0.05 +$CC_MPROP_CHECK: +$ cc_prop = true +$ i = 1 +$ idel = 1 +$ MT_LOOP: +$ if f$type(result_'i') .eqs. "STRING" +$ then +$ set message/nofac/noident/nosever/notext +$ on error then continue +$ cc 'tmpnam'_'i' +$ if .not. ($status) then cc_prop = false +$ on error then continue +$! The headers might lie about the capabilities of the RTL +$ link 'tmpnam'_'i',tmp.opt/opt +$ if .not. ($status) then cc_prop = false +$ set message/fac/ident/sever/text +$ on error then goto err_exit +$ delete/nolog 'tmpnam'_'i'.*;* +$ if (cc_prop) +$ then +$ write sys$output "Checking for ''cdef'... ", mdef_'i' +$ if f$type(mdef_'i') .eqs. "INTEGER" - + then call write_config f$fao("#define !AS !UL",cdef,mdef_'i') +$ if f$type('cdef_val'_yes) .eqs. "STRING" - + then call write_config f$fao("#define !AS !AS",cdef,mdef_'i') +$ goto msym_clean +$ else +$ i = i + 1 +$ goto mt_loop +$ endif +$ endif +$ write sys$output "Checking for ''cdef'... no" +$ call write_config f$fao("#undef !AS",cdef) +$ MSYM_CLEAN: +$ if (idel .le. msym_max) +$ then +$ delete/sym mdef_'idel' +$ idel = idel + 1 +$ goto msym_clean +$ endif +$ return +$!------------------------------------------------------------------------------ +$! +$! Write configuration to both permanent and temporary config file +$! +$! Version history +$! 0.01 20031029 First version to receive a number +$! +$WRITE_CONFIG: SUBROUTINE +$ write aconf 'p1' +$ open/append confh 'th' +$ write confh 'p1' +$ close confh +$ENDSUBROUTINE +$!------------------------------------------------------------------------------ +$! +$! Analyze the project map file and create the symbol vector for a shareable +$! image from it +$! +$! Version history +$! 0.01 20120128 First version +$! 0.02 20120226 Add pre-load logic +$! +$ MAP_2_SHOPT: Subroutine +$! +$ SAY := "WRITE_ SYS$OUTPUT" +$! +$ IF F$SEARCH("''P1'") .EQS. "" +$ THEN +$ SAY "MAP_2_SHOPT-E-NOSUCHFILE: Error, inputfile ''p1' not available" +$ goto exit_m2s +$ ENDIF +$ IF "''P2'" .EQS. "" +$ THEN +$ SAY "MAP_2_SHOPT: Error, no output file provided" +$ goto exit_m2s +$ ENDIF +$! +$ module1 = "deflate#deflateEnd#deflateInit_#deflateParams#deflateSetDictionary" +$ module2 = "gzclose#gzerror#gzgetc#gzgets#gzopen#gzprintf#gzputc#gzputs#gzread" +$ module3 = "gzseek#gztell#inflate#inflateEnd#inflateInit_#inflateSetDictionary" +$ module4 = "inflateSync#uncompress#zlibVersion#compress" +$ open/read map 'p1 +$ if axp .or. ia64 +$ then +$ open/write aopt a.opt +$ open/write bopt b.opt +$ write aopt " CASE_SENSITIVE=YES" +$ write bopt "SYMBOL_VECTOR= (-" +$ mod_sym_num = 1 +$ MOD_SYM_LOOP: +$ if f$type(module'mod_sym_num') .nes. "" +$ then +$ mod_in = 0 +$ MOD_SYM_IN: +$ shared_proc = f$element(mod_in, "#", module'mod_sym_num') +$ if shared_proc .nes. "#" +$ then +$ write aopt f$fao(" symbol_vector=(!AS/!AS=PROCEDURE)",- + f$edit(shared_proc,"upcase"),shared_proc) +$ write bopt f$fao("!AS=PROCEDURE,-",shared_proc) +$ mod_in = mod_in + 1 +$ goto mod_sym_in +$ endif +$ mod_sym_num = mod_sym_num + 1 +$ goto mod_sym_loop +$ endif +$MAP_LOOP: +$ read/end=map_end map line +$ if (f$locate("{",line).lt. f$length(line)) .or. - + (f$locate("global:", line) .lt. f$length(line)) +$ then +$ proc = true +$ goto map_loop +$ endif +$ if f$locate("}",line).lt. f$length(line) then proc = false +$ if f$locate("local:", line) .lt. f$length(line) then proc = false +$ if proc +$ then +$ shared_proc = f$edit(line,"collapse") +$ chop_semi = f$locate(";", shared_proc) +$ if chop_semi .lt. f$length(shared_proc) then - + shared_proc = f$extract(0, chop_semi, shared_proc) +$ write aopt f$fao(" symbol_vector=(!AS/!AS=PROCEDURE)",- + f$edit(shared_proc,"upcase"),shared_proc) +$ write bopt f$fao("!AS=PROCEDURE,-",shared_proc) +$ endif +$ goto map_loop +$MAP_END: +$ close/nolog aopt +$ close/nolog bopt +$ open/append libopt 'p2' +$ open/read aopt a.opt +$ open/read bopt b.opt +$ALOOP: +$ read/end=aloop_end aopt line +$ write libopt line +$ goto aloop +$ALOOP_END: +$ close/nolog aopt +$ sv = "" +$BLOOP: +$ read/end=bloop_end bopt svn +$ if (svn.nes."") +$ then +$ if (sv.nes."") then write libopt sv +$ sv = svn +$ endif +$ goto bloop +$BLOOP_END: +$ write libopt f$extract(0,f$length(sv)-2,sv), "-" +$ write libopt ")" +$ close/nolog bopt +$ delete/nolog/noconf a.opt;*,b.opt;* +$ else +$ if vax +$ then +$ open/append libopt 'p2' +$ mod_sym_num = 1 +$ VMOD_SYM_LOOP: +$ if f$type(module'mod_sym_num') .nes. "" +$ then +$ mod_in = 0 +$ VMOD_SYM_IN: +$ shared_proc = f$element(mod_in, "#", module'mod_sym_num') +$ if shared_proc .nes. "#" +$ then +$ write libopt f$fao("UNIVERSAL=!AS",- + f$edit(shared_proc,"upcase")) +$ mod_in = mod_in + 1 +$ goto vmod_sym_in +$ endif +$ mod_sym_num = mod_sym_num + 1 +$ goto vmod_sym_loop +$ endif +$VMAP_LOOP: +$ read/end=vmap_end map line +$ if (f$locate("{",line).lt. f$length(line)) .or. - + (f$locate("global:", line) .lt. f$length(line)) +$ then +$ proc = true +$ goto vmap_loop +$ endif +$ if f$locate("}",line).lt. f$length(line) then proc = false +$ if f$locate("local:", line) .lt. f$length(line) then proc = false +$ if proc +$ then +$ shared_proc = f$edit(line,"collapse") +$ chop_semi = f$locate(";", shared_proc) +$ if chop_semi .lt. f$length(shared_proc) then - + shared_proc = f$extract(0, chop_semi, shared_proc) +$ write libopt f$fao("UNIVERSAL=!AS",- + f$edit(shared_proc,"upcase")) +$ endif +$ goto vmap_loop +$VMAP_END: +$ else +$ write sys$output "Unknown Architecture (Not VAX, AXP, or IA64)" +$ write sys$output "No options file created" +$ endif +$ endif +$ EXIT_M2S: +$ close/nolog map +$ close/nolog libopt +$ endsubroutine diff --git a/zlib/minigzip.c b/external/zlib/minigzip.c similarity index 100% rename from zlib/minigzip.c rename to external/zlib/minigzip.c diff --git a/external/zlib/msdos/Makefile.bor b/external/zlib/msdos/Makefile.bor new file mode 100644 index 00000000..3d12a2c2 --- /dev/null +++ b/external/zlib/msdos/Makefile.bor @@ -0,0 +1,115 @@ +# Makefile for zlib +# Borland C++ +# Last updated: 15-Mar-2003 + +# To use, do "make -fmakefile.bor" +# To compile in small model, set below: MODEL=s + +# WARNING: the small model is supported but only for small values of +# MAX_WBITS and MAX_MEM_LEVEL. For example: +# -DMAX_WBITS=11 -DDEF_WBITS=11 -DMAX_MEM_LEVEL=3 +# If you wish to reduce the memory requirements (default 256K for big +# objects plus a few K), you can add to the LOC macro below: +# -DMAX_MEM_LEVEL=7 -DMAX_WBITS=14 +# See zconf.h for details about the memory requirements. + +# ------------ Turbo C++, Borland C++ ------------ + +# Optional nonstandard preprocessor flags (e.g. -DMAX_MEM_LEVEL=7) +# should be added to the environment via "set LOCAL_ZLIB=-DFOO" or added +# to the declaration of LOC here: +LOC = $(LOCAL_ZLIB) + +# type for CPU required: 0: 8086, 1: 80186, 2: 80286, 3: 80386, etc. +CPU_TYP = 0 + +# memory model: one of s, m, c, l (small, medium, compact, large) +MODEL=l + +# replace bcc with tcc for Turbo C++ 1.0, with bcc32 for the 32 bit version +CC=bcc +LD=bcc +AR=tlib + +# compiler flags +# replace "-O2" by "-O -G -a -d" for Turbo C++ 1.0 +CFLAGS=-O2 -Z -m$(MODEL) $(LOC) + +LDFLAGS=-m$(MODEL) -f- + + +# variables +ZLIB_LIB = zlib_$(MODEL).lib + +OBJ1 = adler32.obj compress.obj crc32.obj deflate.obj gzclose.obj gzlib.obj gzread.obj +OBJ2 = gzwrite.obj infback.obj inffast.obj inflate.obj inftrees.obj trees.obj uncompr.obj zutil.obj +OBJP1 = +adler32.obj+compress.obj+crc32.obj+deflate.obj+gzclose.obj+gzlib.obj+gzread.obj +OBJP2 = +gzwrite.obj+infback.obj+inffast.obj+inflate.obj+inftrees.obj+trees.obj+uncompr.obj+zutil.obj + + +# targets +all: $(ZLIB_LIB) example.exe minigzip.exe + +.c.obj: + $(CC) -c $(CFLAGS) $*.c + +adler32.obj: adler32.c zlib.h zconf.h + +compress.obj: compress.c zlib.h zconf.h + +crc32.obj: crc32.c zlib.h zconf.h crc32.h + +deflate.obj: deflate.c deflate.h zutil.h zlib.h zconf.h + +gzclose.obj: gzclose.c zlib.h zconf.h gzguts.h + +gzlib.obj: gzlib.c zlib.h zconf.h gzguts.h + +gzread.obj: gzread.c zlib.h zconf.h gzguts.h + +gzwrite.obj: gzwrite.c zlib.h zconf.h gzguts.h + +infback.obj: infback.c zutil.h zlib.h zconf.h inftrees.h inflate.h \ + inffast.h inffixed.h + +inffast.obj: inffast.c zutil.h zlib.h zconf.h inftrees.h inflate.h \ + inffast.h + +inflate.obj: inflate.c zutil.h zlib.h zconf.h inftrees.h inflate.h \ + inffast.h inffixed.h + +inftrees.obj: inftrees.c zutil.h zlib.h zconf.h inftrees.h + +trees.obj: trees.c zutil.h zlib.h zconf.h deflate.h trees.h + +uncompr.obj: uncompr.c zlib.h zconf.h + +zutil.obj: zutil.c zutil.h zlib.h zconf.h + +example.obj: test/example.c zlib.h zconf.h + +minigzip.obj: test/minigzip.c zlib.h zconf.h + + +# the command line is cut to fit in the MS-DOS 128 byte limit: +$(ZLIB_LIB): $(OBJ1) $(OBJ2) + -del $(ZLIB_LIB) + $(AR) $(ZLIB_LIB) $(OBJP1) + $(AR) $(ZLIB_LIB) $(OBJP2) + +example.exe: example.obj $(ZLIB_LIB) + $(LD) $(LDFLAGS) example.obj $(ZLIB_LIB) + +minigzip.exe: minigzip.obj $(ZLIB_LIB) + $(LD) $(LDFLAGS) minigzip.obj $(ZLIB_LIB) + +test: example.exe minigzip.exe + example + echo hello world | minigzip | minigzip -d + +clean: + -del *.obj + -del *.lib + -del *.exe + -del zlib_*.bak + -del foo.gz diff --git a/external/zlib/msdos/Makefile.dj2 b/external/zlib/msdos/Makefile.dj2 new file mode 100644 index 00000000..29b03954 --- /dev/null +++ b/external/zlib/msdos/Makefile.dj2 @@ -0,0 +1,104 @@ +# Makefile for zlib. Modified for djgpp v2.0 by F. J. Donahoe, 3/15/96. +# Copyright (C) 1995-1998 Jean-loup Gailly. +# For conditions of distribution and use, see copyright notice in zlib.h + +# To compile, or to compile and test, type: +# +# make -fmakefile.dj2; make test -fmakefile.dj2 +# +# To install libz.a, zconf.h and zlib.h in the djgpp directories, type: +# +# make install -fmakefile.dj2 +# +# after first defining LIBRARY_PATH and INCLUDE_PATH in djgpp.env as +# in the sample below if the pattern of the DJGPP distribution is to +# be followed. Remember that, while 'es around <=> are ignored in +# makefiles, they are *not* in batch files or in djgpp.env. +# - - - - - +# [make] +# INCLUDE_PATH=%\>;INCLUDE_PATH%%\DJDIR%\include +# LIBRARY_PATH=%\>;LIBRARY_PATH%%\DJDIR%\lib +# BUTT=-m486 +# - - - - - +# Alternately, these variables may be defined below, overriding the values +# in djgpp.env, as +# INCLUDE_PATH=c:\usr\include +# LIBRARY_PATH=c:\usr\lib + +CC=gcc + +#CFLAGS=-MMD -O +#CFLAGS=-O -DMAX_WBITS=14 -DMAX_MEM_LEVEL=7 +#CFLAGS=-MMD -g -DDEBUG +CFLAGS=-MMD -O3 $(BUTT) -Wall -Wwrite-strings -Wpointer-arith -Wconversion \ + -Wstrict-prototypes -Wmissing-prototypes + +# If cp.exe is available, replace "copy /Y" with "cp -fp" . +CP=copy /Y +# If gnu install.exe is available, replace $(CP) with ginstall. +INSTALL=$(CP) +# The default value of RM is "rm -f." If "rm.exe" is found, comment out: +RM=del +LDLIBS=-L. -lz +LD=$(CC) -s -o +LDSHARED=$(CC) + +INCL=zlib.h zconf.h +LIBS=libz.a + +AR=ar rcs + +prefix=/usr/local +exec_prefix = $(prefix) + +OBJS = adler32.o compress.o crc32.o gzclose.o gzlib.o gzread.o gzwrite.o \ + uncompr.o deflate.o trees.o zutil.o inflate.o infback.o inftrees.o inffast.o + +OBJA = +# to use the asm code: make OBJA=match.o + +TEST_OBJS = example.o minigzip.o + +all: example.exe minigzip.exe + +check: test +test: all + ./example + echo hello world | .\minigzip | .\minigzip -d + +%.o : %.c + $(CC) $(CFLAGS) -c $< -o $@ + +libz.a: $(OBJS) $(OBJA) + $(AR) $@ $(OBJS) $(OBJA) + +%.exe : %.o $(LIBS) + $(LD) $@ $< $(LDLIBS) + +# INCLUDE_PATH and LIBRARY_PATH were set for [make] in djgpp.env . + +.PHONY : uninstall clean + +install: $(INCL) $(LIBS) + -@if not exist $(INCLUDE_PATH)\nul mkdir $(INCLUDE_PATH) + -@if not exist $(LIBRARY_PATH)\nul mkdir $(LIBRARY_PATH) + $(INSTALL) zlib.h $(INCLUDE_PATH) + $(INSTALL) zconf.h $(INCLUDE_PATH) + $(INSTALL) libz.a $(LIBRARY_PATH) + +uninstall: + $(RM) $(INCLUDE_PATH)\zlib.h + $(RM) $(INCLUDE_PATH)\zconf.h + $(RM) $(LIBRARY_PATH)\libz.a + +clean: + $(RM) *.d + $(RM) *.o + $(RM) *.exe + $(RM) libz.a + $(RM) foo.gz + +DEPS := $(wildcard *.d) +ifneq ($(DEPS),) +include $(DEPS) +endif diff --git a/external/zlib/msdos/Makefile.emx b/external/zlib/msdos/Makefile.emx new file mode 100644 index 00000000..9c1b57a5 --- /dev/null +++ b/external/zlib/msdos/Makefile.emx @@ -0,0 +1,69 @@ +# Makefile for zlib. Modified for emx 0.9c by Chr. Spieler, 6/17/98. +# Copyright (C) 1995-1998 Jean-loup Gailly. +# For conditions of distribution and use, see copyright notice in zlib.h + +# To compile, or to compile and test, type: +# +# make -fmakefile.emx; make test -fmakefile.emx +# + +CC=gcc + +#CFLAGS=-MMD -O +#CFLAGS=-O -DMAX_WBITS=14 -DMAX_MEM_LEVEL=7 +#CFLAGS=-MMD -g -DDEBUG +CFLAGS=-MMD -O3 $(BUTT) -Wall -Wwrite-strings -Wpointer-arith -Wconversion \ + -Wstrict-prototypes -Wmissing-prototypes + +# If cp.exe is available, replace "copy /Y" with "cp -fp" . +CP=copy /Y +# If gnu install.exe is available, replace $(CP) with ginstall. +INSTALL=$(CP) +# The default value of RM is "rm -f." If "rm.exe" is found, comment out: +RM=del +LDLIBS=-L. -lzlib +LD=$(CC) -s -o +LDSHARED=$(CC) + +INCL=zlib.h zconf.h +LIBS=zlib.a + +AR=ar rcs + +prefix=/usr/local +exec_prefix = $(prefix) + +OBJS = adler32.o compress.o crc32.o gzclose.o gzlib.o gzread.o gzwrite.o \ + uncompr.o deflate.o trees.o zutil.o inflate.o infback.o inftrees.o inffast.o + +TEST_OBJS = example.o minigzip.o + +all: example.exe minigzip.exe + +test: all + ./example + echo hello world | .\minigzip | .\minigzip -d + +%.o : %.c + $(CC) $(CFLAGS) -c $< -o $@ + +zlib.a: $(OBJS) + $(AR) $@ $(OBJS) + +%.exe : %.o $(LIBS) + $(LD) $@ $< $(LDLIBS) + + +.PHONY : clean + +clean: + $(RM) *.d + $(RM) *.o + $(RM) *.exe + $(RM) zlib.a + $(RM) foo.gz + +DEPS := $(wildcard *.d) +ifneq ($(DEPS),) +include $(DEPS) +endif diff --git a/external/zlib/msdos/Makefile.msc b/external/zlib/msdos/Makefile.msc new file mode 100644 index 00000000..ae837861 --- /dev/null +++ b/external/zlib/msdos/Makefile.msc @@ -0,0 +1,112 @@ +# Makefile for zlib +# Microsoft C 5.1 or later +# Last updated: 19-Mar-2003 + +# To use, do "make makefile.msc" +# To compile in small model, set below: MODEL=S + +# If you wish to reduce the memory requirements (default 256K for big +# objects plus a few K), you can add to the LOC macro below: +# -DMAX_MEM_LEVEL=7 -DMAX_WBITS=14 +# See zconf.h for details about the memory requirements. + +# ------------- Microsoft C 5.1 and later ------------- + +# Optional nonstandard preprocessor flags (e.g. -DMAX_MEM_LEVEL=7) +# should be added to the environment via "set LOCAL_ZLIB=-DFOO" or added +# to the declaration of LOC here: +LOC = $(LOCAL_ZLIB) + +# Type for CPU required: 0: 8086, 1: 80186, 2: 80286, 3: 80386, etc. +CPU_TYP = 0 + +# Memory model: one of S, M, C, L (small, medium, compact, large) +MODEL=L + +CC=cl +CFLAGS=-nologo -A$(MODEL) -G$(CPU_TYP) -W3 -Oait -Gs $(LOC) +#-Ox generates bad code with MSC 5.1 +LIB_CFLAGS=-Zl $(CFLAGS) + +LD=link +LDFLAGS=/noi/e/st:0x1500/noe/farcall/packcode +# "/farcall/packcode" are only useful for `large code' memory models +# but should be a "no-op" for small code models. + + +# variables +ZLIB_LIB = zlib_$(MODEL).lib + +OBJ1 = adler32.obj compress.obj crc32.obj deflate.obj gzclose.obj gzlib.obj gzread.obj +OBJ2 = gzwrite.obj infback.obj inffast.obj inflate.obj inftrees.obj trees.obj uncompr.obj zutil.obj + + +# targets +all: $(ZLIB_LIB) example.exe minigzip.exe + +.c.obj: + $(CC) -c $(LIB_CFLAGS) $*.c + +adler32.obj: adler32.c zlib.h zconf.h + +compress.obj: compress.c zlib.h zconf.h + +crc32.obj: crc32.c zlib.h zconf.h crc32.h + +deflate.obj: deflate.c deflate.h zutil.h zlib.h zconf.h + +gzclose.obj: gzclose.c zlib.h zconf.h gzguts.h + +gzlib.obj: gzlib.c zlib.h zconf.h gzguts.h + +gzread.obj: gzread.c zlib.h zconf.h gzguts.h + +gzwrite.obj: gzwrite.c zlib.h zconf.h gzguts.h + +infback.obj: infback.c zutil.h zlib.h zconf.h inftrees.h inflate.h \ + inffast.h inffixed.h + +inffast.obj: inffast.c zutil.h zlib.h zconf.h inftrees.h inflate.h \ + inffast.h + +inflate.obj: inflate.c zutil.h zlib.h zconf.h inftrees.h inflate.h \ + inffast.h inffixed.h + +inftrees.obj: inftrees.c zutil.h zlib.h zconf.h inftrees.h + +trees.obj: trees.c zutil.h zlib.h zconf.h deflate.h trees.h + +uncompr.obj: uncompr.c zlib.h zconf.h + +zutil.obj: zutil.c zutil.h zlib.h zconf.h + +example.obj: test/example.c zlib.h zconf.h + $(CC) -c $(CFLAGS) $*.c + +minigzip.obj: test/minigzip.c zlib.h zconf.h + $(CC) -c $(CFLAGS) $*.c + + +# the command line is cut to fit in the MS-DOS 128 byte limit: +$(ZLIB_LIB): $(OBJ1) $(OBJ2) + if exist $(ZLIB_LIB) del $(ZLIB_LIB) + lib $(ZLIB_LIB) $(OBJ1); + lib $(ZLIB_LIB) $(OBJ2); + +example.exe: example.obj $(ZLIB_LIB) + $(LD) $(LDFLAGS) example.obj,,,$(ZLIB_LIB); + +minigzip.exe: minigzip.obj $(ZLIB_LIB) + $(LD) $(LDFLAGS) minigzip.obj,,,$(ZLIB_LIB); + +test: example.exe minigzip.exe + example + echo hello world | minigzip | minigzip -d + +clean: + -del *.obj + -del *.lib + -del *.exe + -del *.map + -del zlib_*.bak + -del foo.gz diff --git a/external/zlib/msdos/Makefile.tc b/external/zlib/msdos/Makefile.tc new file mode 100644 index 00000000..5aec82a9 --- /dev/null +++ b/external/zlib/msdos/Makefile.tc @@ -0,0 +1,100 @@ +# Makefile for zlib +# Turbo C 2.01, Turbo C++ 1.01 +# Last updated: 15-Mar-2003 + +# To use, do "make -fmakefile.tc" +# To compile in small model, set below: MODEL=s + +# WARNING: the small model is supported but only for small values of +# MAX_WBITS and MAX_MEM_LEVEL. For example: +# -DMAX_WBITS=11 -DMAX_MEM_LEVEL=3 +# If you wish to reduce the memory requirements (default 256K for big +# objects plus a few K), you can add to CFLAGS below: +# -DMAX_MEM_LEVEL=7 -DMAX_WBITS=14 +# See zconf.h for details about the memory requirements. + +# ------------ Turbo C 2.01, Turbo C++ 1.01 ------------ +MODEL=l +CC=tcc +LD=tcc +AR=tlib +# CFLAGS=-O2 -G -Z -m$(MODEL) -DMAX_WBITS=11 -DMAX_MEM_LEVEL=3 +CFLAGS=-O2 -G -Z -m$(MODEL) +LDFLAGS=-m$(MODEL) -f- + + +# variables +ZLIB_LIB = zlib_$(MODEL).lib + +OBJ1 = adler32.obj compress.obj crc32.obj deflate.obj gzclose.obj gzlib.obj gzread.obj +OBJ2 = gzwrite.obj infback.obj inffast.obj inflate.obj inftrees.obj trees.obj uncompr.obj zutil.obj +OBJP1 = +adler32.obj+compress.obj+crc32.obj+deflate.obj+gzclose.obj+gzlib.obj+gzread.obj +OBJP2 = +gzwrite.obj+infback.obj+inffast.obj+inflate.obj+inftrees.obj+trees.obj+uncompr.obj+zutil.obj + + +# targets +all: $(ZLIB_LIB) example.exe minigzip.exe + +.c.obj: + $(CC) -c $(CFLAGS) $*.c + +adler32.obj: adler32.c zlib.h zconf.h + +compress.obj: compress.c zlib.h zconf.h + +crc32.obj: crc32.c zlib.h zconf.h crc32.h + +deflate.obj: deflate.c deflate.h zutil.h zlib.h zconf.h + +gzclose.obj: gzclose.c zlib.h zconf.h gzguts.h + +gzlib.obj: gzlib.c zlib.h zconf.h gzguts.h + +gzread.obj: gzread.c zlib.h zconf.h gzguts.h + +gzwrite.obj: gzwrite.c zlib.h zconf.h gzguts.h + +infback.obj: infback.c zutil.h zlib.h zconf.h inftrees.h inflate.h \ + inffast.h inffixed.h + +inffast.obj: inffast.c zutil.h zlib.h zconf.h inftrees.h inflate.h \ + inffast.h + +inflate.obj: inflate.c zutil.h zlib.h zconf.h inftrees.h inflate.h \ + inffast.h inffixed.h + +inftrees.obj: inftrees.c zutil.h zlib.h zconf.h inftrees.h + +trees.obj: trees.c zutil.h zlib.h zconf.h deflate.h trees.h + +uncompr.obj: uncompr.c zlib.h zconf.h + +zutil.obj: zutil.c zutil.h zlib.h zconf.h + +example.obj: test/example.c zlib.h zconf.h + +minigzip.obj: test/minigzip.c zlib.h zconf.h + + +# the command line is cut to fit in the MS-DOS 128 byte limit: +$(ZLIB_LIB): $(OBJ1) $(OBJ2) + -del $(ZLIB_LIB) + $(AR) $(ZLIB_LIB) $(OBJP1) + $(AR) $(ZLIB_LIB) $(OBJP2) + +example.exe: example.obj $(ZLIB_LIB) + $(LD) $(LDFLAGS) example.obj $(ZLIB_LIB) + +minigzip.exe: minigzip.obj $(ZLIB_LIB) + $(LD) $(LDFLAGS) minigzip.obj $(ZLIB_LIB) + +test: example.exe minigzip.exe + example + echo hello world | minigzip | minigzip -d + +clean: + -del *.obj + -del *.lib + -del *.exe + -del zlib_*.bak + -del foo.gz diff --git a/external/zlib/nintendods/README b/external/zlib/nintendods/README new file mode 100644 index 00000000..ba7a37db --- /dev/null +++ b/external/zlib/nintendods/README @@ -0,0 +1,5 @@ +This Makefile requires devkitARM (http://www.devkitpro.org/category/devkitarm/) and works inside "contrib/nds". It is based on a devkitARM template. + +Eduardo Costa +January 3, 2009 + diff --git a/external/zlib/old/Makefile.emx b/external/zlib/old/Makefile.emx new file mode 100644 index 00000000..4d6ab0ef --- /dev/null +++ b/external/zlib/old/Makefile.emx @@ -0,0 +1,69 @@ +# Makefile for zlib. Modified for emx/rsxnt by Chr. Spieler, 6/16/98. +# Copyright (C) 1995-1998 Jean-loup Gailly. +# For conditions of distribution and use, see copyright notice in zlib.h + +# To compile, or to compile and test, type: +# +# make -fmakefile.emx; make test -fmakefile.emx +# + +CC=gcc -Zwin32 + +#CFLAGS=-MMD -O +#CFLAGS=-O -DMAX_WBITS=14 -DMAX_MEM_LEVEL=7 +#CFLAGS=-MMD -g -DDEBUG +CFLAGS=-MMD -O3 $(BUTT) -Wall -Wwrite-strings -Wpointer-arith -Wconversion \ + -Wstrict-prototypes -Wmissing-prototypes + +# If cp.exe is available, replace "copy /Y" with "cp -fp" . +CP=copy /Y +# If gnu install.exe is available, replace $(CP) with ginstall. +INSTALL=$(CP) +# The default value of RM is "rm -f." If "rm.exe" is found, comment out: +RM=del +LDLIBS=-L. -lzlib +LD=$(CC) -s -o +LDSHARED=$(CC) + +INCL=zlib.h zconf.h +LIBS=zlib.a + +AR=ar rcs + +prefix=/usr/local +exec_prefix = $(prefix) + +OBJS = adler32.o compress.o crc32.o deflate.o gzclose.o gzlib.o gzread.o \ + gzwrite.o infback.o inffast.o inflate.o inftrees.o trees.o uncompr.o zutil.o + +TEST_OBJS = example.o minigzip.o + +all: example.exe minigzip.exe + +test: all + ./example + echo hello world | .\minigzip | .\minigzip -d + +%.o : %.c + $(CC) $(CFLAGS) -c $< -o $@ + +zlib.a: $(OBJS) + $(AR) $@ $(OBJS) + +%.exe : %.o $(LIBS) + $(LD) $@ $< $(LDLIBS) + + +.PHONY : clean + +clean: + $(RM) *.d + $(RM) *.o + $(RM) *.exe + $(RM) zlib.a + $(RM) foo.gz + +DEPS := $(wildcard *.d) +ifneq ($(DEPS),) +include $(DEPS) +endif diff --git a/external/zlib/old/Makefile.riscos b/external/zlib/old/Makefile.riscos new file mode 100644 index 00000000..57e29d3f --- /dev/null +++ b/external/zlib/old/Makefile.riscos @@ -0,0 +1,151 @@ +# Project: zlib_1_03 +# Patched for zlib 1.1.2 rw@shadow.org.uk 19980430 +# test works out-of-the-box, installs `somewhere' on demand + +# Toolflags: +CCflags = -c -depend !Depend -IC: -g -throwback -DRISCOS -fah +C++flags = -c -depend !Depend -IC: -throwback +Linkflags = -aif -c++ -o $@ +ObjAsmflags = -throwback -NoCache -depend !Depend +CMHGflags = +LibFileflags = -c -l -o $@ +Squeezeflags = -o $@ + +# change the line below to where _you_ want the library installed. +libdest = lib:zlib + +# Final targets: +@.lib: @.o.adler32 @.o.compress @.o.crc32 @.o.deflate @.o.gzio \ + @.o.infblock @.o.infcodes @.o.inffast @.o.inflate @.o.inftrees @.o.infutil @.o.trees \ + @.o.uncompr @.o.zutil + LibFile $(LibFileflags) @.o.adler32 @.o.compress @.o.crc32 @.o.deflate \ + @.o.gzio @.o.infblock @.o.infcodes @.o.inffast @.o.inflate @.o.inftrees @.o.infutil \ + @.o.trees @.o.uncompr @.o.zutil +test: @.minigzip @.example @.lib + @copy @.lib @.libc A~C~DF~L~N~P~Q~RS~TV + @echo running tests: hang on. + @/@.minigzip -f -9 libc + @/@.minigzip -d libc-gz + @/@.minigzip -f -1 libc + @/@.minigzip -d libc-gz + @/@.minigzip -h -9 libc + @/@.minigzip -d libc-gz + @/@.minigzip -h -1 libc + @/@.minigzip -d libc-gz + @/@.minigzip -9 libc + @/@.minigzip -d libc-gz + @/@.minigzip -1 libc + @/@.minigzip -d libc-gz + @diff @.lib @.libc + @echo that should have reported '@.lib and @.libc identical' if you have diff. + @/@.example @.fred @.fred + @echo that will have given lots of hello!'s. + +@.minigzip: @.o.minigzip @.lib C:o.Stubs + Link $(Linkflags) @.o.minigzip @.lib C:o.Stubs +@.example: @.o.example @.lib C:o.Stubs + Link $(Linkflags) @.o.example @.lib C:o.Stubs + +install: @.lib + cdir $(libdest) + cdir $(libdest).h + @copy @.h.zlib $(libdest).h.zlib A~C~DF~L~N~P~Q~RS~TV + @copy @.h.zconf $(libdest).h.zconf A~C~DF~L~N~P~Q~RS~TV + @copy @.lib $(libdest).lib A~C~DF~L~N~P~Q~RS~TV + @echo okay, installed zlib in $(libdest) + +clean:; remove @.minigzip + remove @.example + remove @.libc + -wipe @.o.* F~r~cV + remove @.fred + +# User-editable dependencies: +.c.o: + cc $(ccflags) -o $@ $< + +# Static dependencies: + +# Dynamic dependencies: +o.example: c.example +o.example: h.zlib +o.example: h.zconf +o.minigzip: c.minigzip +o.minigzip: h.zlib +o.minigzip: h.zconf +o.adler32: c.adler32 +o.adler32: h.zlib +o.adler32: h.zconf +o.compress: c.compress +o.compress: h.zlib +o.compress: h.zconf +o.crc32: c.crc32 +o.crc32: h.zlib +o.crc32: h.zconf +o.deflate: c.deflate +o.deflate: h.deflate +o.deflate: h.zutil +o.deflate: h.zlib +o.deflate: h.zconf +o.gzio: c.gzio +o.gzio: h.zutil +o.gzio: h.zlib +o.gzio: h.zconf +o.infblock: c.infblock +o.infblock: h.zutil +o.infblock: h.zlib +o.infblock: h.zconf +o.infblock: h.infblock +o.infblock: h.inftrees +o.infblock: h.infcodes +o.infblock: h.infutil +o.infcodes: c.infcodes +o.infcodes: h.zutil +o.infcodes: h.zlib +o.infcodes: h.zconf +o.infcodes: h.inftrees +o.infcodes: h.infblock +o.infcodes: h.infcodes +o.infcodes: h.infutil +o.infcodes: h.inffast +o.inffast: c.inffast +o.inffast: h.zutil +o.inffast: h.zlib +o.inffast: h.zconf +o.inffast: h.inftrees +o.inffast: h.infblock +o.inffast: h.infcodes +o.inffast: h.infutil +o.inffast: h.inffast +o.inflate: c.inflate +o.inflate: h.zutil +o.inflate: h.zlib +o.inflate: h.zconf +o.inflate: h.infblock +o.inftrees: c.inftrees +o.inftrees: h.zutil +o.inftrees: h.zlib +o.inftrees: h.zconf +o.inftrees: h.inftrees +o.inftrees: h.inffixed +o.infutil: c.infutil +o.infutil: h.zutil +o.infutil: h.zlib +o.infutil: h.zconf +o.infutil: h.infblock +o.infutil: h.inftrees +o.infutil: h.infcodes +o.infutil: h.infutil +o.trees: c.trees +o.trees: h.deflate +o.trees: h.zutil +o.trees: h.zlib +o.trees: h.zconf +o.trees: h.trees +o.uncompr: c.uncompr +o.uncompr: h.zlib +o.uncompr: h.zconf +o.zutil: c.zutil +o.zutil: h.zutil +o.zutil: h.zlib +o.zutil: h.zconf diff --git a/external/zlib/old/README b/external/zlib/old/README new file mode 100644 index 00000000..800bf079 --- /dev/null +++ b/external/zlib/old/README @@ -0,0 +1,3 @@ +This directory contains files that have not been updated for zlib 1.2.x + +(Volunteers are encouraged to help clean this up. Thanks.) diff --git a/external/zlib/old/descrip.mms b/external/zlib/old/descrip.mms new file mode 100644 index 00000000..7066da5b --- /dev/null +++ b/external/zlib/old/descrip.mms @@ -0,0 +1,48 @@ +# descrip.mms: MMS description file for building zlib on VMS +# written by Martin P.J. Zinser + +cc_defs = +c_deb = + +.ifdef __DECC__ +pref = /prefix=all +.endif + +OBJS = adler32.obj, compress.obj, crc32.obj, gzio.obj, uncompr.obj,\ + deflate.obj, trees.obj, zutil.obj, inflate.obj, infblock.obj,\ + inftrees.obj, infcodes.obj, infutil.obj, inffast.obj + +CFLAGS= $(C_DEB) $(CC_DEFS) $(PREF) + +all : example.exe minigzip.exe + @ write sys$output " Example applications available" +libz.olb : libz.olb($(OBJS)) + @ write sys$output " libz available" + +example.exe : example.obj libz.olb + link example,libz.olb/lib + +minigzip.exe : minigzip.obj libz.olb + link minigzip,libz.olb/lib,x11vms:xvmsutils.olb/lib + +clean : + delete *.obj;*,libz.olb;* + + +# Other dependencies. +adler32.obj : zutil.h zlib.h zconf.h +compress.obj : zlib.h zconf.h +crc32.obj : zutil.h zlib.h zconf.h +deflate.obj : deflate.h zutil.h zlib.h zconf.h +example.obj : zlib.h zconf.h +gzio.obj : zutil.h zlib.h zconf.h +infblock.obj : zutil.h zlib.h zconf.h infblock.h inftrees.h infcodes.h infutil.h +infcodes.obj : zutil.h zlib.h zconf.h inftrees.h infutil.h infcodes.h inffast.h +inffast.obj : zutil.h zlib.h zconf.h inftrees.h infutil.h inffast.h +inflate.obj : zutil.h zlib.h zconf.h infblock.h +inftrees.obj : zutil.h zlib.h zconf.h inftrees.h +infutil.obj : zutil.h zlib.h zconf.h inftrees.h infutil.h +minigzip.obj : zlib.h zconf.h +trees.obj : deflate.h zutil.h zlib.h zconf.h +uncompr.obj : zlib.h zconf.h +zutil.obj : zutil.h zlib.h zconf.h diff --git a/external/zlib/old/os2/Makefile.os2 b/external/zlib/old/os2/Makefile.os2 new file mode 100644 index 00000000..a105aaa5 --- /dev/null +++ b/external/zlib/old/os2/Makefile.os2 @@ -0,0 +1,136 @@ +# Makefile for zlib under OS/2 using GCC (PGCC) +# For conditions of distribution and use, see copyright notice in zlib.h + +# To compile and test, type: +# cp Makefile.os2 .. +# cd .. +# make -f Makefile.os2 test + +# This makefile will build a static library z.lib, a shared library +# z.dll and a import library zdll.lib. You can use either z.lib or +# zdll.lib by specifying either -lz or -lzdll on gcc's command line + +CC=gcc -Zomf -s + +CFLAGS=-O6 -Wall +#CFLAGS=-O -DMAX_WBITS=14 -DMAX_MEM_LEVEL=7 +#CFLAGS=-g -DDEBUG +#CFLAGS=-O3 -Wall -Wwrite-strings -Wpointer-arith -Wconversion \ +# -Wstrict-prototypes -Wmissing-prototypes + +#################### BUG WARNING: ##################### +## infcodes.c hits a bug in pgcc-1.0, so you have to use either +## -O# where # <= 4 or one of (-fno-ommit-frame-pointer or -fno-force-mem) +## This bug is reportedly fixed in pgcc >1.0, but this was not tested +CFLAGS+=-fno-force-mem + +LDFLAGS=-s -L. -lzdll -Zcrtdll +LDSHARED=$(CC) -s -Zomf -Zdll -Zcrtdll + +VER=1.1.0 +ZLIB=z.lib +SHAREDLIB=z.dll +SHAREDLIBIMP=zdll.lib +LIBS=$(ZLIB) $(SHAREDLIB) $(SHAREDLIBIMP) + +AR=emxomfar cr +IMPLIB=emximp +RANLIB=echo +TAR=tar +SHELL=bash + +prefix=/usr/local +exec_prefix = $(prefix) + +OBJS = adler32.o compress.o crc32.o gzio.o uncompr.o deflate.o trees.o \ + zutil.o inflate.o infblock.o inftrees.o infcodes.o infutil.o inffast.o + +TEST_OBJS = example.o minigzip.o + +DISTFILES = README INDEX ChangeLog configure Make*[a-z0-9] *.[ch] descrip.mms \ + algorithm.txt zlib.3 msdos/Make*[a-z0-9] msdos/zlib.def msdos/zlib.rc \ + nt/Makefile.nt nt/zlib.dnt contrib/README.contrib contrib/*.txt \ + contrib/asm386/*.asm contrib/asm386/*.c \ + contrib/asm386/*.bat contrib/asm386/zlibvc.d?? contrib/iostream/*.cpp \ + contrib/iostream/*.h contrib/iostream2/*.h contrib/iostream2/*.cpp \ + contrib/untgz/Makefile contrib/untgz/*.c contrib/untgz/*.w32 + +all: example.exe minigzip.exe + +test: all + @LD_LIBRARY_PATH=.:$(LD_LIBRARY_PATH) ; export LD_LIBRARY_PATH; \ + echo hello world | ./minigzip | ./minigzip -d || \ + echo ' *** minigzip test FAILED ***' ; \ + if ./example; then \ + echo ' *** zlib test OK ***'; \ + else \ + echo ' *** zlib test FAILED ***'; \ + fi + +$(ZLIB): $(OBJS) + $(AR) $@ $(OBJS) + -@ ($(RANLIB) $@ || true) >/dev/null 2>&1 + +$(SHAREDLIB): $(OBJS) os2/z.def + $(LDSHARED) -o $@ $^ + +$(SHAREDLIBIMP): os2/z.def + $(IMPLIB) -o $@ $^ + +example.exe: example.o $(LIBS) + $(CC) $(CFLAGS) -o $@ example.o $(LDFLAGS) + +minigzip.exe: minigzip.o $(LIBS) + $(CC) $(CFLAGS) -o $@ minigzip.o $(LDFLAGS) + +clean: + rm -f *.o *~ example minigzip libz.a libz.so* foo.gz + +distclean: clean + +zip: + mv Makefile Makefile~; cp -p Makefile.in Makefile + rm -f test.c ztest*.c + v=`sed -n -e 's/\.//g' -e '/VERSION "/s/.*"\(.*\)".*/\1/p' < zlib.h`;\ + zip -ul9 zlib$$v $(DISTFILES) + mv Makefile~ Makefile + +dist: + mv Makefile Makefile~; cp -p Makefile.in Makefile + rm -f test.c ztest*.c + d=zlib-`sed -n '/VERSION "/s/.*"\(.*\)".*/\1/p' < zlib.h`;\ + rm -f $$d.tar.gz; \ + if test ! -d ../$$d; then rm -f ../$$d; ln -s `pwd` ../$$d; fi; \ + files=""; \ + for f in $(DISTFILES); do files="$$files $$d/$$f"; done; \ + cd ..; \ + GZIP=-9 $(TAR) chofz $$d/$$d.tar.gz $$files; \ + if test ! -d $$d; then rm -f $$d; fi + mv Makefile~ Makefile + +tags: + etags *.[ch] + +depend: + makedepend -- $(CFLAGS) -- *.[ch] + +# DO NOT DELETE THIS LINE -- make depend depends on it. + +adler32.o: zlib.h zconf.h +compress.o: zlib.h zconf.h +crc32.o: zlib.h zconf.h +deflate.o: deflate.h zutil.h zlib.h zconf.h +example.o: zlib.h zconf.h +gzio.o: zutil.h zlib.h zconf.h +infblock.o: infblock.h inftrees.h infcodes.h infutil.h zutil.h zlib.h zconf.h +infcodes.o: zutil.h zlib.h zconf.h +infcodes.o: inftrees.h infblock.h infcodes.h infutil.h inffast.h +inffast.o: zutil.h zlib.h zconf.h inftrees.h +inffast.o: infblock.h infcodes.h infutil.h inffast.h +inflate.o: zutil.h zlib.h zconf.h infblock.h +inftrees.o: zutil.h zlib.h zconf.h inftrees.h +infutil.o: zutil.h zlib.h zconf.h infblock.h inftrees.h infcodes.h infutil.h +minigzip.o: zlib.h zconf.h +trees.o: deflate.h zutil.h zlib.h zconf.h trees.h +uncompr.o: zlib.h zconf.h +zutil.o: zutil.h zlib.h zconf.h diff --git a/external/zlib/old/os2/zlib.def b/external/zlib/old/os2/zlib.def new file mode 100644 index 00000000..4c753f1a --- /dev/null +++ b/external/zlib/old/os2/zlib.def @@ -0,0 +1,51 @@ +; +; Slightly modified version of ../nt/zlib.dnt :-) +; + +LIBRARY Z +DESCRIPTION "Zlib compression library for OS/2" +CODE PRELOAD MOVEABLE DISCARDABLE +DATA PRELOAD MOVEABLE MULTIPLE + +EXPORTS + adler32 + compress + crc32 + deflate + deflateCopy + deflateEnd + deflateInit2_ + deflateInit_ + deflateParams + deflateReset + deflateSetDictionary + gzclose + gzdopen + gzerror + gzflush + gzopen + gzread + gzwrite + inflate + inflateEnd + inflateInit2_ + inflateInit_ + inflateReset + inflateSetDictionary + inflateSync + uncompress + zlibVersion + gzprintf + gzputc + gzgetc + gzseek + gzrewind + gztell + gzeof + gzsetparams + zError + inflateSyncPoint + get_crc_table + compress2 + gzputs + gzgets diff --git a/external/zlib/old/visual-basic.txt b/external/zlib/old/visual-basic.txt new file mode 100644 index 00000000..57efe581 --- /dev/null +++ b/external/zlib/old/visual-basic.txt @@ -0,0 +1,160 @@ +See below some functions declarations for Visual Basic. + +Frequently Asked Question: + +Q: Each time I use the compress function I get the -5 error (not enough + room in the output buffer). + +A: Make sure that the length of the compressed buffer is passed by + reference ("as any"), not by value ("as long"). Also check that + before the call of compress this length is equal to the total size of + the compressed buffer and not zero. + + +From: "Jon Caruana" +Subject: Re: How to port zlib declares to vb? +Date: Mon, 28 Oct 1996 18:33:03 -0600 + +Got the answer! (I haven't had time to check this but it's what I got, and +looks correct): + +He has the following routines working: + compress + uncompress + gzopen + gzwrite + gzread + gzclose + +Declares follow: (Quoted from Carlos Rios , in Vb4 form) + +#If Win16 Then 'Use Win16 calls. +Declare Function compress Lib "ZLIB.DLL" (ByVal compr As + String, comprLen As Any, ByVal buf As String, ByVal buflen + As Long) As Integer +Declare Function uncompress Lib "ZLIB.DLL" (ByVal uncompr + As String, uncomprLen As Any, ByVal compr As String, ByVal + lcompr As Long) As Integer +Declare Function gzopen Lib "ZLIB.DLL" (ByVal filePath As + String, ByVal mode As String) As Long +Declare Function gzread Lib "ZLIB.DLL" (ByVal file As + Long, ByVal uncompr As String, ByVal uncomprLen As Integer) + As Integer +Declare Function gzwrite Lib "ZLIB.DLL" (ByVal file As + Long, ByVal uncompr As String, ByVal uncomprLen As Integer) + As Integer +Declare Function gzclose Lib "ZLIB.DLL" (ByVal file As + Long) As Integer +#Else +Declare Function compress Lib "ZLIB32.DLL" + (ByVal compr As String, comprLen As Any, ByVal buf As + String, ByVal buflen As Long) As Integer +Declare Function uncompress Lib "ZLIB32.DLL" + (ByVal uncompr As String, uncomprLen As Any, ByVal compr As + String, ByVal lcompr As Long) As Long +Declare Function gzopen Lib "ZLIB32.DLL" + (ByVal file As String, ByVal mode As String) As Long +Declare Function gzread Lib "ZLIB32.DLL" + (ByVal file As Long, ByVal uncompr As String, ByVal + uncomprLen As Long) As Long +Declare Function gzwrite Lib "ZLIB32.DLL" + (ByVal file As Long, ByVal uncompr As String, ByVal + uncomprLen As Long) As Long +Declare Function gzclose Lib "ZLIB32.DLL" + (ByVal file As Long) As Long +#End If + +-Jon Caruana +jon-net@usa.net +Microsoft Sitebuilder Network Level 1 Member - HTML Writer's Guild Member + + +Here is another example from Michael that he +says conforms to the VB guidelines, and that solves the problem of not +knowing the uncompressed size by storing it at the end of the file: + +'Calling the functions: +'bracket meaning: [optional] {Range of possible values} +'Call subCompressFile( [, , [level of compression {1..9}]]) +'Call subUncompressFile() + +Option Explicit +Private lngpvtPcnSml As Long 'Stores value for 'lngPercentSmaller' +Private Const SUCCESS As Long = 0 +Private Const strFilExt As String = ".cpr" +Private Declare Function lngfncCpr Lib "zlib.dll" Alias "compress2" (ByRef +dest As Any, ByRef destLen As Any, ByRef src As Any, ByVal srcLen As Long, +ByVal level As Integer) As Long +Private Declare Function lngfncUcp Lib "zlib.dll" Alias "uncompress" (ByRef +dest As Any, ByRef destLen As Any, ByRef src As Any, ByVal srcLen As Long) +As Long + +Public Sub subCompressFile(ByVal strargOriFilPth As String, Optional ByVal +strargCprFilPth As String, Optional ByVal intLvl As Integer = 9) + Dim strCprPth As String + Dim lngOriSiz As Long + Dim lngCprSiz As Long + Dim bytaryOri() As Byte + Dim bytaryCpr() As Byte + lngOriSiz = FileLen(strargOriFilPth) + ReDim bytaryOri(lngOriSiz - 1) + Open strargOriFilPth For Binary Access Read As #1 + Get #1, , bytaryOri() + Close #1 + strCprPth = IIf(strargCprFilPth = "", strargOriFilPth, strargCprFilPth) +'Select file path and name + strCprPth = strCprPth & IIf(Right(strCprPth, Len(strFilExt)) = +strFilExt, "", strFilExt) 'Add file extension if not exists + lngCprSiz = (lngOriSiz * 1.01) + 12 'Compression needs temporary a bit +more space then original file size + ReDim bytaryCpr(lngCprSiz - 1) + If lngfncCpr(bytaryCpr(0), lngCprSiz, bytaryOri(0), lngOriSiz, intLvl) = +SUCCESS Then + lngpvtPcnSml = (1# - (lngCprSiz / lngOriSiz)) * 100 + ReDim Preserve bytaryCpr(lngCprSiz - 1) + Open strCprPth For Binary Access Write As #1 + Put #1, , bytaryCpr() + Put #1, , lngOriSiz 'Add the the original size value to the end +(last 4 bytes) + Close #1 + Else + MsgBox "Compression error" + End If + Erase bytaryCpr + Erase bytaryOri +End Sub + +Public Sub subUncompressFile(ByVal strargFilPth As String) + Dim bytaryCpr() As Byte + Dim bytaryOri() As Byte + Dim lngOriSiz As Long + Dim lngCprSiz As Long + Dim strOriPth As String + lngCprSiz = FileLen(strargFilPth) + ReDim bytaryCpr(lngCprSiz - 1) + Open strargFilPth For Binary Access Read As #1 + Get #1, , bytaryCpr() + Close #1 + 'Read the original file size value: + lngOriSiz = bytaryCpr(lngCprSiz - 1) * (2 ^ 24) _ + + bytaryCpr(lngCprSiz - 2) * (2 ^ 16) _ + + bytaryCpr(lngCprSiz - 3) * (2 ^ 8) _ + + bytaryCpr(lngCprSiz - 4) + ReDim Preserve bytaryCpr(lngCprSiz - 5) 'Cut of the original size value + ReDim bytaryOri(lngOriSiz - 1) + If lngfncUcp(bytaryOri(0), lngOriSiz, bytaryCpr(0), lngCprSiz) = SUCCESS +Then + strOriPth = Left(strargFilPth, Len(strargFilPth) - Len(strFilExt)) + Open strOriPth For Binary Access Write As #1 + Put #1, , bytaryOri() + Close #1 + Else + MsgBox "Uncompression error" + End If + Erase bytaryCpr + Erase bytaryOri +End Sub +Public Property Get lngPercentSmaller() As Long + lngPercentSmaller = lngpvtPcnSml +End Property diff --git a/external/zlib/qnx/package.qpg b/external/zlib/qnx/package.qpg new file mode 100644 index 00000000..aebf6e3a --- /dev/null +++ b/external/zlib/qnx/package.qpg @@ -0,0 +1,141 @@ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + Library + + Medium + + 2.0 + + + + zlib + zlib + alain.bonnefoy@icbt.com + Public + public + www.gzip.org/zlib + + + Jean-Loup Gailly,Mark Adler + www.gzip.org/zlib + + zlib@gzip.org + + + A massively spiffy yet delicately unobtrusive compression library. + zlib is designed to be a free, general-purpose, legally unencumbered, lossless data compression library for use on virtually any computer hardware and operating system. + http://www.gzip.org/zlib + + + + + 1.2.8 + Medium + Stable + + + + + + + No License + + + + Software Development/Libraries and Extensions/C Libraries + zlib,compression + qnx6 + qnx6 + None + Developer + + + + + + + + + + + + + + Install + Post + No + Ignore + + No + Optional + + + + + + + + + + + + + InstallOver + zlib + + + + + + + + + + + + + InstallOver + zlib-dev + + + + + + + + + diff --git a/external/zlib/test/example.c b/external/zlib/test/example.c new file mode 100644 index 00000000..5efd7b6e --- /dev/null +++ b/external/zlib/test/example.c @@ -0,0 +1,601 @@ +/* example.c -- usage example of the zlib compression library + * Copyright (C) 1995-2006, 2011 Jean-loup Gailly. + * For conditions of distribution and use, see copyright notice in zlib.h + */ + +/* @(#) $Id$ */ + +#include "zlib.h" +#include + +#ifdef STDC +# include +# include +#endif + +#if defined(VMS) || defined(RISCOS) +# define TESTFILE "foo-gz" +#else +# define TESTFILE "foo.gz" +#endif + +#define CHECK_ERR(err, msg) { \ + if (err != Z_OK) { \ + fprintf(stderr, "%s error: %d\n", msg, err); \ + exit(1); \ + } \ +} + +z_const char hello[] = "hello, hello!"; +/* "hello world" would be more standard, but the repeated "hello" + * stresses the compression code better, sorry... + */ + +const char dictionary[] = "hello"; +uLong dictId; /* Adler32 value of the dictionary */ + +void test_deflate OF((Byte *compr, uLong comprLen)); +void test_inflate OF((Byte *compr, uLong comprLen, + Byte *uncompr, uLong uncomprLen)); +void test_large_deflate OF((Byte *compr, uLong comprLen, + Byte *uncompr, uLong uncomprLen)); +void test_large_inflate OF((Byte *compr, uLong comprLen, + Byte *uncompr, uLong uncomprLen)); +void test_flush OF((Byte *compr, uLong *comprLen)); +void test_sync OF((Byte *compr, uLong comprLen, + Byte *uncompr, uLong uncomprLen)); +void test_dict_deflate OF((Byte *compr, uLong comprLen)); +void test_dict_inflate OF((Byte *compr, uLong comprLen, + Byte *uncompr, uLong uncomprLen)); +int main OF((int argc, char *argv[])); + + +#ifdef Z_SOLO + +void *myalloc OF((void *, unsigned, unsigned)); +void myfree OF((void *, void *)); + +void *myalloc(q, n, m) + void *q; + unsigned n, m; +{ + q = Z_NULL; + return calloc(n, m); +} + +void myfree(void *q, void *p) +{ + q = Z_NULL; + free(p); +} + +static alloc_func zalloc = myalloc; +static free_func zfree = myfree; + +#else /* !Z_SOLO */ + +static alloc_func zalloc = (alloc_func)0; +static free_func zfree = (free_func)0; + +void test_compress OF((Byte *compr, uLong comprLen, + Byte *uncompr, uLong uncomprLen)); +void test_gzio OF((const char *fname, + Byte *uncompr, uLong uncomprLen)); + +/* =========================================================================== + * Test compress() and uncompress() + */ +void test_compress(compr, comprLen, uncompr, uncomprLen) + Byte *compr, *uncompr; + uLong comprLen, uncomprLen; +{ + int err; + uLong len = (uLong)strlen(hello)+1; + + err = compress(compr, &comprLen, (const Bytef*)hello, len); + CHECK_ERR(err, "compress"); + + strcpy((char*)uncompr, "garbage"); + + err = uncompress(uncompr, &uncomprLen, compr, comprLen); + CHECK_ERR(err, "uncompress"); + + if (strcmp((char*)uncompr, hello)) { + fprintf(stderr, "bad uncompress\n"); + exit(1); + } else { + printf("uncompress(): %s\n", (char *)uncompr); + } +} + +/* =========================================================================== + * Test read/write of .gz files + */ +void test_gzio(fname, uncompr, uncomprLen) + const char *fname; /* compressed file name */ + Byte *uncompr; + uLong uncomprLen; +{ +#ifdef NO_GZCOMPRESS + fprintf(stderr, "NO_GZCOMPRESS -- gz* functions cannot compress\n"); +#else + int err; + int len = (int)strlen(hello)+1; + gzFile file; + z_off_t pos; + + file = gzopen(fname, "wb"); + if (file == NULL) { + fprintf(stderr, "gzopen error\n"); + exit(1); + } + gzputc(file, 'h'); + if (gzputs(file, "ello") != 4) { + fprintf(stderr, "gzputs err: %s\n", gzerror(file, &err)); + exit(1); + } + if (gzprintf(file, ", %s!", "hello") != 8) { + fprintf(stderr, "gzprintf err: %s\n", gzerror(file, &err)); + exit(1); + } + gzseek(file, 1L, SEEK_CUR); /* add one zero byte */ + gzclose(file); + + file = gzopen(fname, "rb"); + if (file == NULL) { + fprintf(stderr, "gzopen error\n"); + exit(1); + } + strcpy((char*)uncompr, "garbage"); + + if (gzread(file, uncompr, (unsigned)uncomprLen) != len) { + fprintf(stderr, "gzread err: %s\n", gzerror(file, &err)); + exit(1); + } + if (strcmp((char*)uncompr, hello)) { + fprintf(stderr, "bad gzread: %s\n", (char*)uncompr); + exit(1); + } else { + printf("gzread(): %s\n", (char*)uncompr); + } + + pos = gzseek(file, -8L, SEEK_CUR); + if (pos != 6 || gztell(file) != pos) { + fprintf(stderr, "gzseek error, pos=%ld, gztell=%ld\n", + (long)pos, (long)gztell(file)); + exit(1); + } + + if (gzgetc(file) != ' ') { + fprintf(stderr, "gzgetc error\n"); + exit(1); + } + + if (gzungetc(' ', file) != ' ') { + fprintf(stderr, "gzungetc error\n"); + exit(1); + } + + gzgets(file, (char*)uncompr, (int)uncomprLen); + if (strlen((char*)uncompr) != 7) { /* " hello!" */ + fprintf(stderr, "gzgets err after gzseek: %s\n", gzerror(file, &err)); + exit(1); + } + if (strcmp((char*)uncompr, hello + 6)) { + fprintf(stderr, "bad gzgets after gzseek\n"); + exit(1); + } else { + printf("gzgets() after gzseek: %s\n", (char*)uncompr); + } + + gzclose(file); +#endif +} + +#endif /* Z_SOLO */ + +/* =========================================================================== + * Test deflate() with small buffers + */ +void test_deflate(compr, comprLen) + Byte *compr; + uLong comprLen; +{ + z_stream c_stream; /* compression stream */ + int err; + uLong len = (uLong)strlen(hello)+1; + + c_stream.zalloc = zalloc; + c_stream.zfree = zfree; + c_stream.opaque = (voidpf)0; + + err = deflateInit(&c_stream, Z_DEFAULT_COMPRESSION); + CHECK_ERR(err, "deflateInit"); + + c_stream.next_in = (z_const unsigned char *)hello; + c_stream.next_out = compr; + + while (c_stream.total_in != len && c_stream.total_out < comprLen) { + c_stream.avail_in = c_stream.avail_out = 1; /* force small buffers */ + err = deflate(&c_stream, Z_NO_FLUSH); + CHECK_ERR(err, "deflate"); + } + /* Finish the stream, still forcing small buffers: */ + for (;;) { + c_stream.avail_out = 1; + err = deflate(&c_stream, Z_FINISH); + if (err == Z_STREAM_END) break; + CHECK_ERR(err, "deflate"); + } + + err = deflateEnd(&c_stream); + CHECK_ERR(err, "deflateEnd"); +} + +/* =========================================================================== + * Test inflate() with small buffers + */ +void test_inflate(compr, comprLen, uncompr, uncomprLen) + Byte *compr, *uncompr; + uLong comprLen, uncomprLen; +{ + int err; + z_stream d_stream; /* decompression stream */ + + strcpy((char*)uncompr, "garbage"); + + d_stream.zalloc = zalloc; + d_stream.zfree = zfree; + d_stream.opaque = (voidpf)0; + + d_stream.next_in = compr; + d_stream.avail_in = 0; + d_stream.next_out = uncompr; + + err = inflateInit(&d_stream); + CHECK_ERR(err, "inflateInit"); + + while (d_stream.total_out < uncomprLen && d_stream.total_in < comprLen) { + d_stream.avail_in = d_stream.avail_out = 1; /* force small buffers */ + err = inflate(&d_stream, Z_NO_FLUSH); + if (err == Z_STREAM_END) break; + CHECK_ERR(err, "inflate"); + } + + err = inflateEnd(&d_stream); + CHECK_ERR(err, "inflateEnd"); + + if (strcmp((char*)uncompr, hello)) { + fprintf(stderr, "bad inflate\n"); + exit(1); + } else { + printf("inflate(): %s\n", (char *)uncompr); + } +} + +/* =========================================================================== + * Test deflate() with large buffers and dynamic change of compression level + */ +void test_large_deflate(compr, comprLen, uncompr, uncomprLen) + Byte *compr, *uncompr; + uLong comprLen, uncomprLen; +{ + z_stream c_stream; /* compression stream */ + int err; + + c_stream.zalloc = zalloc; + c_stream.zfree = zfree; + c_stream.opaque = (voidpf)0; + + err = deflateInit(&c_stream, Z_BEST_SPEED); + CHECK_ERR(err, "deflateInit"); + + c_stream.next_out = compr; + c_stream.avail_out = (uInt)comprLen; + + /* At this point, uncompr is still mostly zeroes, so it should compress + * very well: + */ + c_stream.next_in = uncompr; + c_stream.avail_in = (uInt)uncomprLen; + err = deflate(&c_stream, Z_NO_FLUSH); + CHECK_ERR(err, "deflate"); + if (c_stream.avail_in != 0) { + fprintf(stderr, "deflate not greedy\n"); + exit(1); + } + + /* Feed in already compressed data and switch to no compression: */ + deflateParams(&c_stream, Z_NO_COMPRESSION, Z_DEFAULT_STRATEGY); + c_stream.next_in = compr; + c_stream.avail_in = (uInt)comprLen/2; + err = deflate(&c_stream, Z_NO_FLUSH); + CHECK_ERR(err, "deflate"); + + /* Switch back to compressing mode: */ + deflateParams(&c_stream, Z_BEST_COMPRESSION, Z_FILTERED); + c_stream.next_in = uncompr; + c_stream.avail_in = (uInt)uncomprLen; + err = deflate(&c_stream, Z_NO_FLUSH); + CHECK_ERR(err, "deflate"); + + err = deflate(&c_stream, Z_FINISH); + if (err != Z_STREAM_END) { + fprintf(stderr, "deflate should report Z_STREAM_END\n"); + exit(1); + } + err = deflateEnd(&c_stream); + CHECK_ERR(err, "deflateEnd"); +} + +/* =========================================================================== + * Test inflate() with large buffers + */ +void test_large_inflate(compr, comprLen, uncompr, uncomprLen) + Byte *compr, *uncompr; + uLong comprLen, uncomprLen; +{ + int err; + z_stream d_stream; /* decompression stream */ + + strcpy((char*)uncompr, "garbage"); + + d_stream.zalloc = zalloc; + d_stream.zfree = zfree; + d_stream.opaque = (voidpf)0; + + d_stream.next_in = compr; + d_stream.avail_in = (uInt)comprLen; + + err = inflateInit(&d_stream); + CHECK_ERR(err, "inflateInit"); + + for (;;) { + d_stream.next_out = uncompr; /* discard the output */ + d_stream.avail_out = (uInt)uncomprLen; + err = inflate(&d_stream, Z_NO_FLUSH); + if (err == Z_STREAM_END) break; + CHECK_ERR(err, "large inflate"); + } + + err = inflateEnd(&d_stream); + CHECK_ERR(err, "inflateEnd"); + + if (d_stream.total_out != 2*uncomprLen + comprLen/2) { + fprintf(stderr, "bad large inflate: %lld\n", d_stream.total_out); + exit(1); + } else { + printf("large_inflate(): OK\n"); + } +} + +/* =========================================================================== + * Test deflate() with full flush + */ +void test_flush(compr, comprLen) + Byte *compr; + uLong *comprLen; +{ + z_stream c_stream; /* compression stream */ + int err; + uInt len = (uInt)strlen(hello)+1; + + c_stream.zalloc = zalloc; + c_stream.zfree = zfree; + c_stream.opaque = (voidpf)0; + + err = deflateInit(&c_stream, Z_DEFAULT_COMPRESSION); + CHECK_ERR(err, "deflateInit"); + + c_stream.next_in = (z_const unsigned char *)hello; + c_stream.next_out = compr; + c_stream.avail_in = 3; + c_stream.avail_out = (uInt)*comprLen; + err = deflate(&c_stream, Z_FULL_FLUSH); + CHECK_ERR(err, "deflate"); + + compr[3]++; /* force an error in first compressed block */ + c_stream.avail_in = len - 3; + + err = deflate(&c_stream, Z_FINISH); + if (err != Z_STREAM_END) { + CHECK_ERR(err, "deflate"); + } + err = deflateEnd(&c_stream); + CHECK_ERR(err, "deflateEnd"); + + *comprLen = c_stream.total_out; +} + +/* =========================================================================== + * Test inflateSync() + */ +void test_sync(compr, comprLen, uncompr, uncomprLen) + Byte *compr, *uncompr; + uLong comprLen, uncomprLen; +{ + int err; + z_stream d_stream; /* decompression stream */ + + strcpy((char*)uncompr, "garbage"); + + d_stream.zalloc = zalloc; + d_stream.zfree = zfree; + d_stream.opaque = (voidpf)0; + + d_stream.next_in = compr; + d_stream.avail_in = 2; /* just read the zlib header */ + + err = inflateInit(&d_stream); + CHECK_ERR(err, "inflateInit"); + + d_stream.next_out = uncompr; + d_stream.avail_out = (uInt)uncomprLen; + + inflate(&d_stream, Z_NO_FLUSH); + CHECK_ERR(err, "inflate"); + + d_stream.avail_in = (uInt)comprLen-2; /* read all compressed data */ + err = inflateSync(&d_stream); /* but skip the damaged part */ + CHECK_ERR(err, "inflateSync"); + + err = inflate(&d_stream, Z_FINISH); + if (err != Z_DATA_ERROR) { + fprintf(stderr, "inflate should report DATA_ERROR\n"); + /* Because of incorrect adler32 */ + exit(1); + } + err = inflateEnd(&d_stream); + CHECK_ERR(err, "inflateEnd"); + + printf("after inflateSync(): hel%s\n", (char *)uncompr); +} + +/* =========================================================================== + * Test deflate() with preset dictionary + */ +void test_dict_deflate(compr, comprLen) + Byte *compr; + uLong comprLen; +{ + z_stream c_stream; /* compression stream */ + int err; + + c_stream.zalloc = zalloc; + c_stream.zfree = zfree; + c_stream.opaque = (voidpf)0; + + err = deflateInit(&c_stream, Z_BEST_COMPRESSION); + CHECK_ERR(err, "deflateInit"); + + err = deflateSetDictionary(&c_stream, + (const Bytef*)dictionary, (int)sizeof(dictionary)); + CHECK_ERR(err, "deflateSetDictionary"); + + dictId = c_stream.adler; + c_stream.next_out = compr; + c_stream.avail_out = (uInt)comprLen; + + c_stream.next_in = (z_const unsigned char *)hello; + c_stream.avail_in = (uInt)strlen(hello)+1; + + err = deflate(&c_stream, Z_FINISH); + if (err != Z_STREAM_END) { + fprintf(stderr, "deflate should report Z_STREAM_END\n"); + exit(1); + } + err = deflateEnd(&c_stream); + CHECK_ERR(err, "deflateEnd"); +} + +/* =========================================================================== + * Test inflate() with a preset dictionary + */ +void test_dict_inflate(compr, comprLen, uncompr, uncomprLen) + Byte *compr, *uncompr; + uLong comprLen, uncomprLen; +{ + int err; + z_stream d_stream; /* decompression stream */ + + strcpy((char*)uncompr, "garbage"); + + d_stream.zalloc = zalloc; + d_stream.zfree = zfree; + d_stream.opaque = (voidpf)0; + + d_stream.next_in = compr; + d_stream.avail_in = (uInt)comprLen; + + err = inflateInit(&d_stream); + CHECK_ERR(err, "inflateInit"); + + d_stream.next_out = uncompr; + d_stream.avail_out = (uInt)uncomprLen; + + for (;;) { + err = inflate(&d_stream, Z_NO_FLUSH); + if (err == Z_STREAM_END) break; + if (err == Z_NEED_DICT) { + if (d_stream.adler != dictId) { + fprintf(stderr, "unexpected dictionary"); + exit(1); + } + err = inflateSetDictionary(&d_stream, (const Bytef*)dictionary, + (int)sizeof(dictionary)); + } + CHECK_ERR(err, "inflate with dict"); + } + + err = inflateEnd(&d_stream); + CHECK_ERR(err, "inflateEnd"); + + if (strcmp((char*)uncompr, hello)) { + fprintf(stderr, "bad inflate with dict\n"); + exit(1); + } else { + printf("inflate with dictionary: %s\n", (char *)uncompr); + } +} + +/* =========================================================================== + * Usage: example [output.gz [input.gz]] + */ + +int main(argc, argv) + int argc; + char *argv[]; +{ + Byte *compr, *uncompr; + uLong comprLen = 10000*sizeof(int); /* don't overflow on MSDOS */ + uLong uncomprLen = comprLen; + static const char* myVersion = ZLIB_VERSION; + + if (zlibVersion()[0] != myVersion[0]) { + fprintf(stderr, "incompatible zlib version\n"); + exit(1); + + } else if (strcmp(zlibVersion(), ZLIB_VERSION) != 0) { + fprintf(stderr, "warning: different zlib version\n"); + } + + printf("zlib version %s = 0x%04x, compile flags = 0x%llx\n", + ZLIB_VERSION, ZLIB_VERNUM, zlibCompileFlags()); + + compr = (Byte*)calloc((uInt)comprLen, 1); + uncompr = (Byte*)calloc((uInt)uncomprLen, 1); + /* compr and uncompr are cleared to avoid reading uninitialized + * data and to ensure that uncompr compresses well. + */ + if (compr == Z_NULL || uncompr == Z_NULL) { + printf("out of memory\n"); + exit(1); + } + +#ifdef Z_SOLO + argc = strlen(argv[0]); +#else + test_compress(compr, comprLen, uncompr, uncomprLen); + + test_gzio((argc > 1 ? argv[1] : TESTFILE), + uncompr, uncomprLen); +#endif + + test_deflate(compr, comprLen); + test_inflate(compr, comprLen, uncompr, uncomprLen); + + test_large_deflate(compr, comprLen, uncompr, uncomprLen); + test_large_inflate(compr, comprLen, uncompr, uncomprLen); + + test_flush(compr, &comprLen); + test_sync(compr, comprLen, uncompr, uncomprLen); + comprLen = uncomprLen; + + test_dict_deflate(compr, comprLen); + test_dict_inflate(compr, comprLen, uncompr, uncomprLen); + + free(compr); + free(uncompr); + + return 0; +} diff --git a/external/zlib/test/infcover.c b/external/zlib/test/infcover.c new file mode 100644 index 00000000..fe3d9203 --- /dev/null +++ b/external/zlib/test/infcover.c @@ -0,0 +1,671 @@ +/* infcover.c -- test zlib's inflate routines with full code coverage + * Copyright (C) 2011 Mark Adler + * For conditions of distribution and use, see copyright notice in zlib.h + */ + +/* to use, do: ./configure --cover && make cover */ + +#include +#include +#include +#include +#include "zlib.h" + +/* get definition of internal structure so we can mess with it (see pull()), + and so we can call inflate_trees() (see cover5()) */ +#define ZLIB_INTERNAL +#include "inftrees.h" +#include "inflate.h" + +#define local static + +/* -- memory tracking routines -- */ + +/* + These memory tracking routines are provided to zlib and track all of zlib's + allocations and deallocations, check for LIFO operations, keep a current + and high water mark of total bytes requested, optionally set a limit on the + total memory that can be allocated, and when done check for memory leaks. + + They are used as follows: + + z_stream strm; + mem_setup(&strm) initializes the memory tracking and sets the + zalloc, zfree, and opaque members of strm to use + memory tracking for all zlib operations on strm + mem_limit(&strm, limit) sets a limit on the total bytes requested -- a + request that exceeds this limit will result in an + allocation failure (returns NULL) -- setting the + limit to zero means no limit, which is the default + after mem_setup() + mem_used(&strm, "msg") prints to stderr "msg" and the total bytes used + mem_high(&strm, "msg") prints to stderr "msg" and the high water mark + mem_done(&strm, "msg") ends memory tracking, releases all allocations + for the tracking as well as leaked zlib blocks, if + any. If there was anything unusual, such as leaked + blocks, non-FIFO frees, or frees of addresses not + allocated, then "msg" and information about the + problem is printed to stderr. If everything is + normal, nothing is printed. mem_done resets the + strm members to Z_NULL to use the default memory + allocation routines on the next zlib initialization + using strm. + */ + +/* these items are strung together in a linked list, one for each allocation */ +struct mem_item { + void *ptr; /* pointer to allocated memory */ + size_t size; /* requested size of allocation */ + struct mem_item *next; /* pointer to next item in list, or NULL */ +}; + +/* this structure is at the root of the linked list, and tracks statistics */ +struct mem_zone { + struct mem_item *first; /* pointer to first item in list, or NULL */ + size_t total, highwater; /* total allocations, and largest total */ + size_t limit; /* memory allocation limit, or 0 if no limit */ + int notlifo, rogue; /* counts of non-LIFO frees and rogue frees */ +}; + +/* memory allocation routine to pass to zlib */ +local void *mem_alloc(void *mem, unsigned count, unsigned size) +{ + void *ptr; + struct mem_item *item; + struct mem_zone *zone = mem; + size_t len = count * (size_t)size; + + /* induced allocation failure */ + if (zone == NULL || (zone->limit && zone->total + len > zone->limit)) + return NULL; + + /* perform allocation using the standard library, fill memory with a + non-zero value to make sure that the code isn't depending on zeros */ + ptr = malloc(len); + if (ptr == NULL) + return NULL; + memset(ptr, 0xa5, len); + + /* create a new item for the list */ + item = malloc(sizeof(struct mem_item)); + if (item == NULL) { + free(ptr); + return NULL; + } + item->ptr = ptr; + item->size = len; + + /* insert item at the beginning of the list */ + item->next = zone->first; + zone->first = item; + + /* update the statistics */ + zone->total += item->size; + if (zone->total > zone->highwater) + zone->highwater = zone->total; + + /* return the allocated memory */ + return ptr; +} + +/* memory free routine to pass to zlib */ +local void mem_free(void *mem, void *ptr) +{ + struct mem_item *item, *next; + struct mem_zone *zone = mem; + + /* if no zone, just do a free */ + if (zone == NULL) { + free(ptr); + return; + } + + /* point next to the item that matches ptr, or NULL if not found -- remove + the item from the linked list if found */ + next = zone->first; + if (next) { + if (next->ptr == ptr) + zone->first = next->next; /* first one is it, remove from list */ + else { + do { /* search the linked list */ + item = next; + next = item->next; + } while (next != NULL && next->ptr != ptr); + if (next) { /* if found, remove from linked list */ + item->next = next->next; + zone->notlifo++; /* not a LIFO free */ + } + + } + } + + /* if found, update the statistics and free the item */ + if (next) { + zone->total -= next->size; + free(next); + } + + /* if not found, update the rogue count */ + else + zone->rogue++; + + /* in any case, do the requested free with the standard library function */ + free(ptr); +} + +/* set up a controlled memory allocation space for monitoring, set the stream + parameters to the controlled routines, with opaque pointing to the space */ +local void mem_setup(z_stream *strm) +{ + struct mem_zone *zone; + + zone = malloc(sizeof(struct mem_zone)); + assert(zone != NULL); + zone->first = NULL; + zone->total = 0; + zone->highwater = 0; + zone->limit = 0; + zone->notlifo = 0; + zone->rogue = 0; + strm->opaque = zone; + strm->zalloc = mem_alloc; + strm->zfree = mem_free; +} + +/* set a limit on the total memory allocation, or 0 to remove the limit */ +local void mem_limit(z_stream *strm, size_t limit) +{ + struct mem_zone *zone = strm->opaque; + + zone->limit = limit; +} + +/* show the current total requested allocations in bytes */ +local void mem_used(z_stream *strm, char *prefix) +{ + struct mem_zone *zone = strm->opaque; + + fprintf(stderr, "%s: %lu allocated\n", prefix, zone->total); +} + +/* show the high water allocation in bytes */ +local void mem_high(z_stream *strm, char *prefix) +{ + struct mem_zone *zone = strm->opaque; + + fprintf(stderr, "%s: %lu high water mark\n", prefix, zone->highwater); +} + +/* release the memory allocation zone -- if there are any surprises, notify */ +local void mem_done(z_stream *strm, char *prefix) +{ + int count = 0; + struct mem_item *item, *next; + struct mem_zone *zone = strm->opaque; + + /* show high water mark */ + mem_high(strm, prefix); + + /* free leftover allocations and item structures, if any */ + item = zone->first; + while (item != NULL) { + free(item->ptr); + next = item->next; + free(item); + item = next; + count++; + } + + /* issue alerts about anything unexpected */ + if (count || zone->total) + fprintf(stderr, "** %s: %lu bytes in %d blocks not freed\n", + prefix, zone->total, count); + if (zone->notlifo) + fprintf(stderr, "** %s: %d frees not LIFO\n", prefix, zone->notlifo); + if (zone->rogue) + fprintf(stderr, "** %s: %d frees not recognized\n", + prefix, zone->rogue); + + /* free the zone and delete from the stream */ + free(zone); + strm->opaque = Z_NULL; + strm->zalloc = Z_NULL; + strm->zfree = Z_NULL; +} + +/* -- inflate test routines -- */ + +/* Decode a hexadecimal string, set *len to length, in[] to the bytes. This + decodes liberally, in that hex digits can be adjacent, in which case two in + a row writes a byte. Or they can delimited by any non-hex character, where + the delimiters are ignored except when a single hex digit is followed by a + delimiter in which case that single digit writes a byte. The returned + data is allocated and must eventually be freed. NULL is returned if out of + memory. If the length is not needed, then len can be NULL. */ +local unsigned char *h2b(const char *hex, unsigned *len) +{ + unsigned char *in; + unsigned next, val; + + in = malloc((strlen(hex) + 1) >> 1); + if (in == NULL) + return NULL; + next = 0; + val = 1; + do { + if (*hex >= '0' && *hex <= '9') + val = (val << 4) + *hex - '0'; + else if (*hex >= 'A' && *hex <= 'F') + val = (val << 4) + *hex - 'A' + 10; + else if (*hex >= 'a' && *hex <= 'f') + val = (val << 4) + *hex - 'a' + 10; + else if (val != 1 && val < 32) /* one digit followed by delimiter */ + val += 240; /* make it look like two digits */ + if (val > 255) { /* have two digits */ + in[next++] = val & 0xff; /* save the decoded byte */ + val = 1; /* start over */ + } + } while (*hex++); /* go through the loop with the terminating null */ + if (len != NULL) + *len = next; + in = reallocf(in, next); + return in; +} + +/* generic inflate() run, where hex is the hexadecimal input data, what is the + text to include in an error message, step is how much input data to feed + inflate() on each call, or zero to feed it all, win is the window bits + parameter to inflateInit2(), len is the size of the output buffer, and err + is the error code expected from the first inflate() call (the second + inflate() call is expected to return Z_STREAM_END). If win is 47, then + header information is collected with inflateGetHeader(). If a zlib stream + is looking for a dictionary, then an empty dictionary is provided. + inflate() is run until all of the input data is consumed. */ +local void inf(char *hex, char *what, unsigned step, int win, unsigned len, + int err) +{ + int ret; + unsigned have; + unsigned char *in, *out; + z_stream strm, copy; + gz_header head; + + mem_setup(&strm); + strm.avail_in = 0; + strm.next_in = Z_NULL; + ret = inflateInit2(&strm, win); + if (ret != Z_OK) { + mem_done(&strm, what); + return; + } + out = malloc(len); assert(out != NULL); + if (win == 47) { + head.extra = out; + head.extra_max = len; + head.name = out; + head.name_max = len; + head.comment = out; + head.comm_max = len; + ret = inflateGetHeader(&strm, &head); assert(ret == Z_OK); + } + in = h2b(hex, &have); assert(in != NULL); + if (step == 0 || step > have) + step = have; + strm.avail_in = step; + have -= step; + strm.next_in = in; + do { + strm.avail_out = len; + strm.next_out = out; + ret = inflate(&strm, Z_NO_FLUSH); assert(err == 9 || ret == err); + if (ret != Z_OK && ret != Z_BUF_ERROR && ret != Z_NEED_DICT) + break; + if (ret == Z_NEED_DICT) { + ret = inflateSetDictionary(&strm, in, 1); + assert(ret == Z_DATA_ERROR); + mem_limit(&strm, 1); + ret = inflateSetDictionary(&strm, out, 0); + assert(ret == Z_MEM_ERROR); + mem_limit(&strm, 0); + ((struct inflate_state *)strm.state)->mode = DICT; + ret = inflateSetDictionary(&strm, out, 0); + assert(ret == Z_OK); + ret = inflate(&strm, Z_NO_FLUSH); assert(ret == Z_BUF_ERROR); + } + ret = inflateCopy(©, &strm); assert(ret == Z_OK); + ret = inflateEnd(©); assert(ret == Z_OK); + err = 9; /* don't care next time around */ + have += strm.avail_in; + strm.avail_in = step > have ? have : step; + have -= strm.avail_in; + } while (strm.avail_in); + free(in); + free(out); + ret = inflateReset2(&strm, -8); assert(ret == Z_OK); + ret = inflateEnd(&strm); assert(ret == Z_OK); + mem_done(&strm, what); +} + +/* cover all of the lines in inflate.c up to inflate() */ +local void cover_support(void) +{ + int ret; + z_stream strm; + + mem_setup(&strm); + strm.avail_in = 0; + strm.next_in = Z_NULL; + ret = inflateInit(&strm); assert(ret == Z_OK); + mem_used(&strm, "inflate init"); + ret = inflatePrime(&strm, 5, 31); assert(ret == Z_OK); + ret = inflatePrime(&strm, -1, 0); assert(ret == Z_OK); + ret = inflateSetDictionary(&strm, Z_NULL, 0); + assert(ret == Z_STREAM_ERROR); + ret = inflateEnd(&strm); assert(ret == Z_OK); + mem_done(&strm, "prime"); + + inf("63 0", "force window allocation", 0, -15, 1, Z_OK); + inf("63 18 5", "force window replacement", 0, -8, 259, Z_OK); + inf("63 18 68 30 d0 0 0", "force split window update", 4, -8, 259, Z_OK); + inf("3 0", "use fixed blocks", 0, -15, 1, Z_STREAM_END); + inf("", "bad window size", 0, 1, 0, Z_STREAM_ERROR); + + mem_setup(&strm); + strm.avail_in = 0; + strm.next_in = Z_NULL; + ret = inflateInit_(&strm, ZLIB_VERSION - 1, (int)sizeof(z_stream)); + assert(ret == Z_VERSION_ERROR); + mem_done(&strm, "wrong version"); + + strm.avail_in = 0; + strm.next_in = Z_NULL; + ret = inflateInit(&strm); assert(ret == Z_OK); + ret = inflateEnd(&strm); assert(ret == Z_OK); + fputs("inflate built-in memory routines\n", stderr); +} + +/* cover all inflate() header and trailer cases and code after inflate() */ +local void cover_wrap(void) +{ + int ret; + z_stream strm, copy; + unsigned char dict[257]; + + ret = inflate(Z_NULL, 0); assert(ret == Z_STREAM_ERROR); + ret = inflateEnd(Z_NULL); assert(ret == Z_STREAM_ERROR); + ret = inflateCopy(Z_NULL, Z_NULL); assert(ret == Z_STREAM_ERROR); + fputs("inflate bad parameters\n", stderr); + + inf("1f 8b 0 0", "bad gzip method", 0, 31, 0, Z_DATA_ERROR); + inf("1f 8b 8 80", "bad gzip flags", 0, 31, 0, Z_DATA_ERROR); + inf("77 85", "bad zlib method", 0, 15, 0, Z_DATA_ERROR); + inf("8 99", "set window size from header", 0, 0, 0, Z_OK); + inf("78 9c", "bad zlib window size", 0, 8, 0, Z_DATA_ERROR); + inf("78 9c 63 0 0 0 1 0 1", "check adler32", 0, 15, 1, Z_STREAM_END); + inf("1f 8b 8 1e 0 0 0 0 0 0 1 0 0 0 0 0 0", "bad header crc", 0, 47, 1, + Z_DATA_ERROR); + inf("1f 8b 8 2 0 0 0 0 0 0 1d 26 3 0 0 0 0 0 0 0 0 0", "check gzip length", + 0, 47, 0, Z_STREAM_END); + inf("78 90", "bad zlib header check", 0, 47, 0, Z_DATA_ERROR); + inf("8 b8 0 0 0 1", "need dictionary", 0, 8, 0, Z_NEED_DICT); + inf("78 9c 63 0", "compute adler32", 0, 15, 1, Z_OK); + + mem_setup(&strm); + strm.avail_in = 0; + strm.next_in = Z_NULL; + ret = inflateInit2(&strm, -8); + strm.avail_in = 2; + strm.next_in = (void *)"\x63"; + strm.avail_out = 1; + strm.next_out = (void *)&ret; + mem_limit(&strm, 1); + ret = inflate(&strm, Z_NO_FLUSH); assert(ret == Z_MEM_ERROR); + ret = inflate(&strm, Z_NO_FLUSH); assert(ret == Z_MEM_ERROR); + mem_limit(&strm, 0); + memset(dict, 0, 257); + ret = inflateSetDictionary(&strm, dict, 257); + assert(ret == Z_OK); + mem_limit(&strm, (sizeof(struct inflate_state) << 1) + 256); + ret = inflatePrime(&strm, 16, 0); assert(ret == Z_OK); + strm.avail_in = 2; + strm.next_in = (void *)"\x80"; + ret = inflateSync(&strm); assert(ret == Z_DATA_ERROR); + ret = inflate(&strm, Z_NO_FLUSH); assert(ret == Z_STREAM_ERROR); + strm.avail_in = 4; + strm.next_in = (void *)"\0\0\xff\xff"; + ret = inflateSync(&strm); assert(ret == Z_OK); + (void)inflateSyncPoint(&strm); + ret = inflateCopy(©, &strm); assert(ret == Z_MEM_ERROR); + mem_limit(&strm, 0); + ret = inflateUndermine(&strm, 1); assert(ret == Z_DATA_ERROR); + (void)inflateMark(&strm); + ret = inflateEnd(&strm); assert(ret == Z_OK); + mem_done(&strm, "miscellaneous, force memory errors"); +} + +/* input and output functions for inflateBack() */ +local unsigned pull(void *desc, unsigned char **buf) +{ + static unsigned int next = 0; + static unsigned char dat[] = {0x63, 0, 2, 0}; + struct inflate_state *state; + + if (desc == Z_NULL) { + next = 0; + return 0; /* no input (already provided at next_in) */ + } + state = (void *)((z_stream *)desc)->state; + if (state != Z_NULL) + state->mode = SYNC; /* force an otherwise impossible situation */ + return next < sizeof(dat) ? (*buf = dat + next++, 1) : 0; +} + +local int push(void *desc, unsigned char *buf, unsigned len) +{ + buf += len; + return desc != Z_NULL; /* force error if desc not null */ +} + +/* cover inflateBack() up to common deflate data cases and after those */ +local void cover_back(void) +{ + int ret; + z_stream strm; + unsigned char win[32768]; + + ret = inflateBackInit_(Z_NULL, 0, win, 0, 0); + assert(ret == Z_VERSION_ERROR); + ret = inflateBackInit(Z_NULL, 0, win); assert(ret == Z_STREAM_ERROR); + ret = inflateBack(Z_NULL, Z_NULL, Z_NULL, Z_NULL, Z_NULL); + assert(ret == Z_STREAM_ERROR); + ret = inflateBackEnd(Z_NULL); assert(ret == Z_STREAM_ERROR); + fputs("inflateBack bad parameters\n", stderr); + + mem_setup(&strm); + ret = inflateBackInit(&strm, 15, win); assert(ret == Z_OK); + strm.avail_in = 2; + strm.next_in = (void *)"\x03"; + ret = inflateBack(&strm, pull, Z_NULL, push, Z_NULL); + assert(ret == Z_STREAM_END); + /* force output error */ + strm.avail_in = 3; + strm.next_in = (void *)"\x63\x00"; + ret = inflateBack(&strm, pull, Z_NULL, push, &strm); + assert(ret == Z_BUF_ERROR); + /* force mode error by mucking with state */ + ret = inflateBack(&strm, pull, &strm, push, Z_NULL); + assert(ret == Z_STREAM_ERROR); + ret = inflateBackEnd(&strm); assert(ret == Z_OK); + mem_done(&strm, "inflateBack bad state"); + + ret = inflateBackInit(&strm, 15, win); assert(ret == Z_OK); + ret = inflateBackEnd(&strm); assert(ret == Z_OK); + fputs("inflateBack built-in memory routines\n", stderr); +} + +/* do a raw inflate of data in hexadecimal with both inflate and inflateBack */ +local int try(char *hex, char *id, int err) +{ + int ret; + unsigned len, size; + unsigned char *in, *out, *win; + char *prefix; + z_stream strm; + + /* convert to hex */ + in = h2b(hex, &len); + assert(in != NULL); + + /* allocate work areas */ + size = len << 3; + out = malloc(size); + assert(out != NULL); + win = malloc(32768); + assert(win != NULL); + prefix = malloc(strlen(id) + 6); + assert(prefix != NULL); + + /* first with inflate */ + strcpy(prefix, id); + strcat(prefix, "-late"); + mem_setup(&strm); + strm.avail_in = 0; + strm.next_in = Z_NULL; + ret = inflateInit2(&strm, err < 0 ? 47 : -15); + assert(ret == Z_OK); + strm.avail_in = len; + strm.next_in = in; + do { + strm.avail_out = size; + strm.next_out = out; + ret = inflate(&strm, Z_TREES); + assert(ret != Z_STREAM_ERROR && ret != Z_MEM_ERROR); + if (ret == Z_DATA_ERROR || ret == Z_NEED_DICT) + break; + } while (strm.avail_in || strm.avail_out == 0); + if (err) { + assert(ret == Z_DATA_ERROR); + assert(strcmp(id, strm.msg) == 0); + } + inflateEnd(&strm); + mem_done(&strm, prefix); + + /* then with inflateBack */ + if (err >= 0) { + strcpy(prefix, id); + strcat(prefix, "-back"); + mem_setup(&strm); + ret = inflateBackInit(&strm, 15, win); + assert(ret == Z_OK); + strm.avail_in = len; + strm.next_in = in; + ret = inflateBack(&strm, pull, Z_NULL, push, Z_NULL); + assert(ret != Z_STREAM_ERROR); + if (err) { + assert(ret == Z_DATA_ERROR); + assert(strcmp(id, strm.msg) == 0); + } + inflateBackEnd(&strm); + mem_done(&strm, prefix); + } + + /* clean up */ + free(prefix); + free(win); + free(out); + free(in); + return ret; +} + +/* cover deflate data cases in both inflate() and inflateBack() */ +local void cover_inflate(void) +{ + try("0 0 0 0 0", "invalid stored block lengths", 1); + try("3 0", "fixed", 0); + try("6", "invalid block type", 1); + try("1 1 0 fe ff 0", "stored", 0); + try("fc 0 0", "too many length or distance symbols", 1); + try("4 0 fe ff", "invalid code lengths set", 1); + try("4 0 24 49 0", "invalid bit length repeat", 1); + try("4 0 24 e9 ff ff", "invalid bit length repeat", 1); + try("4 0 24 e9 ff 6d", "invalid code -- missing end-of-block", 1); + try("4 80 49 92 24 49 92 24 71 ff ff 93 11 0", + "invalid literal/lengths set", 1); + try("4 80 49 92 24 49 92 24 f b4 ff ff c3 84", "invalid distances set", 1); + try("4 c0 81 8 0 0 0 0 20 7f eb b 0 0", "invalid literal/length code", 1); + try("2 7e ff ff", "invalid distance code", 1); + try("c c0 81 0 0 0 0 0 90 ff 6b 4 0", "invalid distance too far back", 1); + + /* also trailer mismatch just in inflate() */ + try("1f 8b 8 0 0 0 0 0 0 0 3 0 0 0 0 1", "incorrect data check", -1); + try("1f 8b 8 0 0 0 0 0 0 0 3 0 0 0 0 0 0 0 0 1", + "incorrect length check", -1); + try("5 c0 21 d 0 0 0 80 b0 fe 6d 2f 91 6c", "pull 17", 0); + try("5 e0 81 91 24 cb b2 2c 49 e2 f 2e 8b 9a 47 56 9f fb fe ec d2 ff 1f", + "long code", 0); + try("ed c0 1 1 0 0 0 40 20 ff 57 1b 42 2c 4f", "length extra", 0); + try("ed cf c1 b1 2c 47 10 c4 30 fa 6f 35 1d 1 82 59 3d fb be 2e 2a fc f c", + "long distance and extra", 0); + try("ed c0 81 0 0 0 0 80 a0 fd a9 17 a9 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 " + "0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6", "window end", 0); + inf("2 8 20 80 0 3 0", "inflate_fast TYPE return", 0, -15, 258, + Z_STREAM_END); + inf("63 18 5 40 c 0", "window wrap", 3, -8, 300, Z_OK); +} + +/* cover remaining lines in inftrees.c */ +local void cover_trees(void) +{ + int ret; + unsigned bits; + unsigned short lens[16], work[16]; + code *next, table[ENOUGH_DISTS]; + + /* we need to call inflate_table() directly in order to manifest not- + enough errors, since zlib insures that enough is always enough */ + for (bits = 0; bits < 15; bits++) + lens[bits] = (unsigned short)(bits + 1); + lens[15] = 15; + next = table; + bits = 15; + ret = inflate_table(DISTS, lens, 16, &next, &bits, work); + assert(ret == 1); + next = table; + bits = 1; + ret = inflate_table(DISTS, lens, 16, &next, &bits, work); + assert(ret == 1); + fputs("inflate_table not enough errors\n", stderr); +} + +/* cover remaining inffast.c decoding and window copying */ +local void cover_fast(void) +{ + inf("e5 e0 81 ad 6d cb b2 2c c9 01 1e 59 63 ae 7d ee fb 4d fd b5 35 41 68" + " ff 7f 0f 0 0 0", "fast length extra bits", 0, -8, 258, Z_DATA_ERROR); + inf("25 fd 81 b5 6d 59 b6 6a 49 ea af 35 6 34 eb 8c b9 f6 b9 1e ef 67 49" + " 50 fe ff ff 3f 0 0", "fast distance extra bits", 0, -8, 258, + Z_DATA_ERROR); + inf("3 7e 0 0 0 0 0", "fast invalid distance code", 0, -8, 258, + Z_DATA_ERROR); + inf("1b 7 0 0 0 0 0", "fast invalid literal/length code", 0, -8, 258, + Z_DATA_ERROR); + inf("d c7 1 ae eb 38 c 4 41 a0 87 72 de df fb 1f b8 36 b1 38 5d ff ff 0", + "fast 2nd level codes and too far back", 0, -8, 258, Z_DATA_ERROR); + inf("63 18 5 8c 10 8 0 0 0 0", "very common case", 0, -8, 259, Z_OK); + inf("63 60 60 18 c9 0 8 18 18 18 26 c0 28 0 29 0 0 0", + "contiguous and wrap around window", 6, -8, 259, Z_OK); + inf("63 0 3 0 0 0 0 0", "copy direct from output", 0, -8, 259, + Z_STREAM_END); +} + +int main(void) +{ + fprintf(stderr, "%s\n", zlibVersion()); + cover_support(); + cover_wrap(); + cover_back(); + cover_inflate(); + cover_trees(); + cover_fast(); + return 0; +} diff --git a/external/zlib/test/minigzip.c b/external/zlib/test/minigzip.c new file mode 100755 index 00000000..41723652 --- /dev/null +++ b/external/zlib/test/minigzip.c @@ -0,0 +1,659 @@ +/* minigzip.c -- simulate gzip using the zlib compression library + * Copyright (C) 1995-2006, 2010, 2011 Jean-loup Gailly. + * For conditions of distribution and use, see copyright notice in zlib.h + */ + +/* + * minigzip is a minimal implementation of the gzip utility. This is + * only an example of using zlib and isn't meant to replace the + * full-featured gzip. No attempt is made to deal with file systems + * limiting names to 14 or 8+3 characters, etc... Error checking is + * very limited. So use minigzip only for testing; use gzip for the + * real thing. On MSDOS, use only on file names without extension + * or in pipe mode. + */ + +/* @(#) $Id$ */ + +#include "zlib.h" +#include + +#ifdef STDC +# include +# include +#endif + +#ifdef USE_MMAP +# include +# include +# include +#endif + +#if defined(MSDOS) || defined(OS2) || defined(WIN32) || defined(__CYGWIN__) +# include +# include +# ifdef UNDER_CE +# include +# endif +# define SET_BINARY_MODE(file) setmode(fileno(file), O_BINARY) +#else +# define SET_BINARY_MODE(file) +#endif + +#ifdef _MSC_VER +# define snprintf _snprintf +#endif + +#ifdef VMS +# define unlink delete +# define GZ_SUFFIX "-gz" +#endif +#ifdef RISCOS +# define unlink remove +# define GZ_SUFFIX "-gz" +# define fileno(file) file->__file +#endif +#if defined(__MWERKS__) && __dest_os != __be_os && __dest_os != __win32_os +# include /* for fileno */ +#endif + +#if !defined(Z_HAVE_UNISTD_H) && !defined(_LARGEFILE64_SOURCE) +#ifndef WIN32 /* unlink already in stdio.h for WIN32 */ + extern int unlink OF((const char *)); +#endif +#endif + +#if defined(UNDER_CE) +# include +# define perror(s) pwinerror(s) + +/* Map the Windows error number in ERROR to a locale-dependent error + message string and return a pointer to it. Typically, the values + for ERROR come from GetLastError. + + The string pointed to shall not be modified by the application, + but may be overwritten by a subsequent call to strwinerror + + The strwinerror function does not change the current setting + of GetLastError. */ + +static char *strwinerror (error) + DWORD error; +{ + static char buf[1024]; + + wchar_t *msgbuf; + DWORD lasterr = GetLastError(); + DWORD chars = FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM + | FORMAT_MESSAGE_ALLOCATE_BUFFER, + NULL, + error, + 0, /* Default language */ + (LPVOID)&msgbuf, + 0, + NULL); + if (chars != 0) { + /* If there is an \r\n appended, zap it. */ + if (chars >= 2 + && msgbuf[chars - 2] == '\r' && msgbuf[chars - 1] == '\n') { + chars -= 2; + msgbuf[chars] = 0; + } + + if (chars > sizeof (buf) - 1) { + chars = sizeof (buf) - 1; + msgbuf[chars] = 0; + } + + wcstombs(buf, msgbuf, chars + 1); + LocalFree(msgbuf); + } + else { + sprintf(buf, "unknown win32 error (%ld)", error); + } + + SetLastError(lasterr); + return buf; +} + +static void pwinerror (s) + const char *s; +{ + if (s && *s) + fprintf(stderr, "%s: %s\n", s, strwinerror(GetLastError ())); + else + fprintf(stderr, "%s\n", strwinerror(GetLastError ())); +} + +#endif /* UNDER_CE */ + +#ifndef GZ_SUFFIX +# define GZ_SUFFIX ".gz" +#endif +#define SUFFIX_LEN (sizeof(GZ_SUFFIX)-1) + +#define BUFLEN 16384 +#define MAX_NAME_LEN 1024 + +#ifdef MAXSEG_64K +# define local static + /* Needed for systems with limitation on stack size. */ +#else +# define local +#endif + +#ifdef Z_SOLO +/* for Z_SOLO, create simplified gz* functions using deflate and inflate */ + +#if defined(Z_HAVE_UNISTD_H) || defined(Z_LARGE) +# include /* for unlink() */ +#endif + +void *myalloc OF((void *, unsigned, unsigned)); +void myfree OF((void *, void *)); + +void *myalloc(q, n, m) + void *q; + unsigned n, m; +{ + q = Z_NULL; + return calloc(n, m); +} + +void myfree(q, p) + void *q, *p; +{ + q = Z_NULL; + free(p); +} + +typedef struct gzFile_s { + FILE *file; + int write; + int err; + char *msg; + z_stream strm; +} *gzFile; + +gzFile gzopen OF((const char *, const char *)); +gzFile gzdopen OF((int, const char *)); +gzFile gz_open OF((const char *, int, const char *)); + +gzFile gzopen(path, mode) +const char *path; +const char *mode; +{ + return gz_open(path, -1, mode); +} + +gzFile gzdopen(fd, mode) +int fd; +const char *mode; +{ + return gz_open(NULL, fd, mode); +} + +gzFile gz_open(path, fd, mode) + const char *path; + int fd; + const char *mode; +{ + gzFile gz; + int ret; + + gz = malloc(sizeof(struct gzFile_s)); + if (gz == NULL) + return NULL; + gz->write = strchr(mode, 'w') != NULL; + gz->strm.zalloc = myalloc; + gz->strm.zfree = myfree; + gz->strm.opaque = Z_NULL; + if (gz->write) + ret = deflateInit2(&(gz->strm), -1, 8, 15 + 16, 8, 0); + else { + gz->strm.next_in = 0; + gz->strm.avail_in = Z_NULL; + ret = inflateInit2(&(gz->strm), 15 + 16); + } + if (ret != Z_OK) { + free(gz); + return NULL; + } + gz->file = path == NULL ? fdopen(fd, gz->write ? "wb" : "rb") : + fopen(path, gz->write ? "wb" : "rb"); + if (gz->file == NULL) { + gz->write ? deflateEnd(&(gz->strm)) : inflateEnd(&(gz->strm)); + free(gz); + return NULL; + } + gz->err = 0; + gz->msg = ""; + return gz; +} + +int gzwrite OF((gzFile, const void *, unsigned)); + +int gzwrite(gz, buf, len) + gzFile gz; + const void *buf; + unsigned len; +{ + z_stream *strm; + unsigned char out[BUFLEN]; + + if (gz == NULL || !gz->write) + return 0; + strm = &(gz->strm); + strm->next_in = (void *)buf; + strm->avail_in = len; + do { + strm->next_out = out; + strm->avail_out = BUFLEN; + (void)deflate(strm, Z_NO_FLUSH); + fwrite(out, 1, BUFLEN - strm->avail_out, gz->file); + } while (strm->avail_out == 0); + return len; +} + +int gzread OF((gzFile, void *, unsigned)); + +int gzread(gz, buf, len) + gzFile gz; + void *buf; + unsigned len; +{ + int ret; + unsigned got; + unsigned char in[1]; + z_stream *strm; + + if (gz == NULL || gz->write) + return 0; + if (gz->err) + return 0; + strm = &(gz->strm); + strm->next_out = (void *)buf; + strm->avail_out = len; + do { + got = fread(in, 1, 1, gz->file); + if (got == 0) + break; + strm->next_in = in; + strm->avail_in = 1; + ret = inflate(strm, Z_NO_FLUSH); + if (ret == Z_DATA_ERROR) { + gz->err = Z_DATA_ERROR; + gz->msg = strm->msg; + return 0; + } + if (ret == Z_STREAM_END) + inflateReset(strm); + } while (strm->avail_out); + return len - strm->avail_out; +} + +int gzclose OF((gzFile)); + +int gzclose(gz) + gzFile gz; +{ + z_stream *strm; + unsigned char out[BUFLEN]; + + if (gz == NULL) + return Z_STREAM_ERROR; + strm = &(gz->strm); + if (gz->write) { + strm->next_in = Z_NULL; + strm->avail_in = 0; + do { + strm->next_out = out; + strm->avail_out = BUFLEN; + (void)deflate(strm, Z_FINISH); + fwrite(out, 1, BUFLEN - strm->avail_out, gz->file); + } while (strm->avail_out == 0); + deflateEnd(strm); + } + else + inflateEnd(strm); + fclose(gz->file); + free(gz); + return Z_OK; +} + +const char *gzerror OF((gzFile, int *)); + +const char *gzerror(gz, err) + gzFile gz; + int *err; +{ + *err = gz->err; + return gz->msg; +} + +#endif + +char *prog; + +void error OF((const char *msg)); +void gz_compress OF((FILE *in, gzFile out)); +#ifdef USE_MMAP +int gz_compress_mmap OF((FILE *in, gzFile out)); +#endif +void gz_uncompress OF((gzFile in, FILE *out)); +void file_compress OF((char *file, char *mode, int keep)); +void file_uncompress OF((char *file, int keep)); +int main OF((int argc, char *argv[])); + +/* =========================================================================== + * Display error message and exit + */ +void error(msg) + const char *msg; +{ + fprintf(stderr, "%s: %s\n", prog, msg); + exit(1); +} + +/* =========================================================================== + * Compress input to output then close both files. + */ + +void gz_compress(in, out) + FILE *in; + gzFile out; +{ + local char buf[BUFLEN]; + int len; + int err; + +#ifdef USE_MMAP + /* Try first compressing with mmap. If mmap fails (minigzip used in a + * pipe), use the normal fread loop. + */ + if (gz_compress_mmap(in, out) == Z_OK) return; +#endif + for (;;) { + len = (int)fread(buf, 1, sizeof(buf), in); + if (ferror(in)) { + perror("fread"); + exit(1); + } + if (len == 0) break; + + if (gzwrite(out, buf, (unsigned)len) != len) error(gzerror(out, &err)); + } + fclose(in); + if (gzclose(out) != Z_OK) error("failed gzclose"); +} + +#ifdef USE_MMAP /* MMAP version, Miguel Albrecht */ + +/* Try compressing the input file at once using mmap. Return Z_OK if + * if success, Z_ERRNO otherwise. + */ +int gz_compress_mmap(in, out) + FILE *in; + gzFile out; +{ + int len; + int err; + int ifd = fileno(in); + caddr_t buf; /* mmap'ed buffer for the entire input file */ + off_t buf_len; /* length of the input file */ + struct stat sb; + + /* Determine the size of the file, needed for mmap: */ + if (fstat(ifd, &sb) < 0) return Z_ERRNO; + buf_len = sb.st_size; + if (buf_len <= 0) return Z_ERRNO; + + /* Now do the actual mmap: */ + buf = mmap((caddr_t) 0, buf_len, PROT_READ, MAP_SHARED, ifd, (off_t)0); + if (buf == (caddr_t)(-1)) return Z_ERRNO; + + /* Compress the whole file at once: */ + len = gzwrite(out, (char *)buf, (unsigned)buf_len); + + if (len != (int)buf_len) error(gzerror(out, &err)); + + munmap(buf, buf_len); + fclose(in); + if (gzclose(out) != Z_OK) error("failed gzclose"); + return Z_OK; +} +#endif /* USE_MMAP */ + +/* =========================================================================== + * Uncompress input to output then close both files. + */ +void gz_uncompress(in, out) + gzFile in; + FILE *out; +{ + local char buf[BUFLEN]; + int len; + int err; + + for (;;) { + len = gzread(in, buf, sizeof(buf)); + if (len < 0) error (gzerror(in, &err)); + if (len == 0) break; + + if ((int)fwrite(buf, 1, (unsigned)len, out) != len) { + error("failed fwrite"); + } + } + if (fclose(out)) error("failed fclose"); + + if (gzclose(in) != Z_OK) error("failed gzclose"); +} + + +/* =========================================================================== + * Compress the given file: create a corresponding .gz file and remove the + * original. + */ +void file_compress(file, mode, keep) + char *file; + char *mode; + int keep; +{ + local char outfile[MAX_NAME_LEN]; + FILE *in; + gzFile out; + + if (strlen(file) + strlen(GZ_SUFFIX) >= sizeof(outfile)) { + fprintf(stderr, "%s: filename too long\n", prog); + exit(1); + } + +#if !defined(NO_snprintf) && !defined(NO_vsnprintf) + snprintf(outfile, sizeof(outfile), "%s%s", file, GZ_SUFFIX); +#else + strcpy(outfile, file); + strcat(outfile, GZ_SUFFIX); +#endif + + in = fopen(file, "rb"); + if (in == NULL) { + perror(file); + exit(1); + } + out = gzopen(outfile, mode); + if (out == NULL) { + fprintf(stderr, "%s: can't gzopen %s\n", prog, outfile); + exit(1); + } + gz_compress(in, out); + + if (!keep) + unlink(file); +} + + +/* =========================================================================== + * Uncompress the given file and remove the original. + */ +void file_uncompress(file, keep) + char *file; + int keep; +{ + local char buf[MAX_NAME_LEN]; + char *infile, *outfile; + FILE *out; + gzFile in; + size_t len = strlen(file); + + if (len + strlen(GZ_SUFFIX) >= sizeof(buf)) { + fprintf(stderr, "%s: filename too long\n", prog); + exit(1); + } + +#if !defined(NO_snprintf) && !defined(NO_vsnprintf) + snprintf(buf, sizeof(buf), "%s", file); +#else + strcpy(buf, file); +#endif + + if (len > SUFFIX_LEN && strcmp(file+len-SUFFIX_LEN, GZ_SUFFIX) == 0) { + infile = file; + outfile = buf; + outfile[len-3] = '\0'; + } else { + outfile = file; + infile = buf; +#if !defined(NO_snprintf) && !defined(NO_vsnprintf) + snprintf(buf + len, sizeof(buf) - len, "%s", GZ_SUFFIX); +#else + strcat(infile, GZ_SUFFIX); +#endif + } + in = gzopen(infile, "rb"); + if (in == NULL) { + fprintf(stderr, "%s: can't gzopen %s\n", prog, infile); + exit(1); + } + out = fopen(outfile, "wb"); + if (out == NULL) { + perror(file); + exit(1); + } + + gz_uncompress(in, out); + + if (!keep) + unlink(infile); +} + + +/* =========================================================================== + * Usage: minigzip [-c] [-d] [-f] [-h] [-k] [-r] [-1 to -9] [files...] + * -c : write to standard output + * -d : decompress + * -f : compress with Z_FILTERED + * -h : compress with Z_HUFFMAN_ONLY + * -k : Keep input files + * -r : compress with Z_RLE + * -1 to -9 : compression level + */ + +int main(argc, argv) + int argc; + char *argv[]; +{ + int copyout = 0; + int uncompr = 0; + int keep = 0; + gzFile file; + char *bname, outmode[20]; + +#if !defined(NO_snprintf) && !defined(NO_vsnprintf) + snprintf(outmode, sizeof(outmode), "%s", "wb6 "); +#else + strcpy(outmode, "wb6 "); +#endif + + prog = argv[0]; + bname = strrchr(argv[0], '/'); + if (bname) + bname++; + else + bname = argv[0]; + argc--, argv++; + + if (!strcmp(bname, "gunzip")) + uncompr = 1; + else if (!strcmp(bname, "zcat")) + copyout = uncompr = 1; + + while (argc > 0) { + if (strcmp(*argv, "-c") == 0) + copyout = 1; + else if (strcmp(*argv, "-d") == 0) + uncompr = 1; + else if (strcmp(*argv, "-f") == 0) + outmode[3] = 'f'; + else if (strcmp(*argv, "-h") == 0) + outmode[3] = 'h'; + else if (strcmp(*argv, "-k") == 0) + keep = 1; + else if (strcmp(*argv, "-r") == 0) + outmode[3] = 'R'; + else if ((*argv)[0] == '-' && (*argv)[1] >= '1' && (*argv)[1] <= '9' && + (*argv)[2] == 0) + outmode[2] = (*argv)[1]; + else + break; + argc--, argv++; + } + if (outmode[3] == ' ') + outmode[3] = 0; + if (argc == 0) { + SET_BINARY_MODE(stdin); + SET_BINARY_MODE(stdout); + if (uncompr) { + file = gzdopen(fileno(stdin), "rb"); + if (file == NULL) error("can't gzdopen stdin"); + gz_uncompress(file, stdout); + } else { + file = gzdopen(fileno(stdout), outmode); + if (file == NULL) error("can't gzdopen stdout"); + gz_compress(stdin, file); + } + } else { + if (copyout) { + SET_BINARY_MODE(stdout); + } + do { + if (uncompr) { + if (copyout) { + file = gzopen(*argv, "rb"); + if (file == NULL) + fprintf(stderr, "%s: can't gzopen %s\n", prog, *argv); + else + gz_uncompress(file, stdout); + } else { + file_uncompress(*argv, keep); + } + } else { + if (copyout) { + FILE * in = fopen(*argv, "rb"); + + if (in == NULL) { + perror(*argv); + } else { + file = gzdopen(fileno(stdout), outmode); + if (file == NULL) error("can't gzdopen stdout"); + + gz_compress(in, file); + } + + } else { + file_compress(*argv, outmode, keep); + } + } + } while (argv++, --argc); + } + return 0; +} diff --git a/zlib/treebuild.xml b/external/zlib/treebuild.xml similarity index 100% rename from zlib/treebuild.xml rename to external/zlib/treebuild.xml diff --git a/zlib/trees.c b/external/zlib/trees.c similarity index 100% rename from zlib/trees.c rename to external/zlib/trees.c diff --git a/zlib/trees.h b/external/zlib/trees.h similarity index 100% rename from zlib/trees.h rename to external/zlib/trees.h diff --git a/external/zlib/ucm.cmake b/external/zlib/ucm.cmake new file mode 100644 index 00000000..7eb2efb1 --- /dev/null +++ b/external/zlib/ucm.cmake @@ -0,0 +1,636 @@ +# +# ucm.cmake - useful cmake macros +# +# Copyright (c) 2016 Viktor Kirilov +# +# Distributed under the MIT Software License +# See accompanying file LICENSE.txt or copy at +# https://opensource.org/licenses/MIT +# +# The documentation can be found at the library's page: +# https://github.com/onqtam/ucm + +cmake_minimum_required(VERSION 2.8.12) + +include(CMakeParseArguments) + +# optionally include cotire - the git submodule might not be inited (or the user might have already included it) +if(NOT COMMAND cotire) + include(${CMAKE_CURRENT_LIST_DIR}/../cotire/CMake/cotire.cmake OPTIONAL) +endif() + +if(COMMAND cotire AND "1.7.9" VERSION_LESS "${COTIRE_CMAKE_MODULE_VERSION}") + set(ucm_with_cotire 1) +else() + set(ucm_with_cotire 0) +endif() + +# option(UCM_UNITY_BUILD "Enable unity build for targets registered with the ucm_add_target() macro" OFF) +# option(UCM_NO_COTIRE_FOLDER "Do not use a cotire folder in the solution explorer for all unity and cotire related targets" ON) + +# ucm_add_flags +# Adds compiler flags to CMAKE__FLAGS or to a specific config +macro(ucm_add_flags) + cmake_parse_arguments(ARG "C;CXX;CLEAR_OLD" "" "CONFIG" ${ARGN}) + + if(NOT ARG_CONFIG) + set(ARG_CONFIG " ") + endif() + + foreach(CONFIG ${ARG_CONFIG}) + # determine to which flags to add + if(NOT ${CONFIG} STREQUAL " ") + string(TOUPPER ${CONFIG} CONFIG) + set(CXX_FLAGS CMAKE_CXX_FLAGS_${CONFIG}) + set(C_FLAGS CMAKE_C_FLAGS_${CONFIG}) + else() + set(CXX_FLAGS CMAKE_CXX_FLAGS) + set(C_FLAGS CMAKE_C_FLAGS) + endif() + + # clear the old flags + if(${ARG_CLEAR_OLD}) + if("${ARG_CXX}" OR NOT "${ARG_C}") + set(${CXX_FLAGS} "") + endif() + if("${ARG_C}" OR NOT "${ARG_CXX}") + set(${C_FLAGS} "") + endif() + endif() + + # add all the passed flags + foreach(flag ${ARG_UNPARSED_ARGUMENTS}) + if("${ARG_CXX}" OR NOT "${ARG_C}") + set(${CXX_FLAGS} "${${CXX_FLAGS}} ${flag}") + endif() + if("${ARG_C}" OR NOT "${ARG_CXX}") + set(${C_FLAGS} "${${C_FLAGS}} ${flag}") + endif() + endforeach() + endforeach() + +endmacro() + +# ucm_set_flags +# Sets the CMAKE__FLAGS compiler flags or for a specific config +macro(ucm_set_flags) + ucm_add_flags(CLEAR_OLD ${ARGN}) +endmacro() + +# ucm_add_linker_flags +# Adds linker flags to CMAKE__LINKER_FLAGS or to a specific config +macro(ucm_add_linker_flags) + cmake_parse_arguments(ARG "CLEAR_OLD;EXE;MODULE;SHARED;STATIC" "" "CONFIG" ${ARGN}) + + if(NOT ARG_CONFIG) + set(ARG_CONFIG " ") + endif() + + foreach(CONFIG ${ARG_CONFIG}) + string(TOUPPER "${CONFIG}" CONFIG) + + if(NOT ${ARG_EXE} AND NOT ${ARG_MODULE} AND NOT ${ARG_SHARED} AND NOT ${ARG_STATIC}) + set(ARG_EXE 1) + set(ARG_MODULE 1) + set(ARG_SHARED 1) + set(ARG_STATIC 1) + endif() + + set(flags_configs "") + if(${ARG_EXE}) + if(NOT "${CONFIG}" STREQUAL " ") + list(APPEND flags_configs CMAKE_EXE_LINKER_FLAGS_${CONFIG}) + else() + list(APPEND flags_configs CMAKE_EXE_LINKER_FLAGS) + endif() + endif() + if(${ARG_MODULE}) + if(NOT "${CONFIG}" STREQUAL " ") + list(APPEND flags_configs CMAKE_MODULE_LINKER_FLAGS_${CONFIG}) + else() + list(APPEND flags_configs CMAKE_MODULE_LINKER_FLAGS) + endif() + endif() + if(${ARG_SHARED}) + if(NOT "${CONFIG}" STREQUAL " ") + list(APPEND flags_configs CMAKE_SHARED_LINKER_FLAGS_${CONFIG}) + else() + list(APPEND flags_configs CMAKE_SHARED_LINKER_FLAGS) + endif() + endif() + if(${ARG_STATIC}) + if(NOT "${CONFIG}" STREQUAL " ") + list(APPEND flags_configs CMAKE_STATIC_LINKER_FLAGS_${CONFIG}) + else() + list(APPEND flags_configs CMAKE_STATIC_LINKER_FLAGS) + endif() + endif() + + # clear the old flags + if(${ARG_CLEAR_OLD}) + foreach(flags ${flags_configs}) + set(${flags} "") + endforeach() + endif() + + # add all the passed flags + foreach(flag ${ARG_UNPARSED_ARGUMENTS}) + foreach(flags ${flags_configs}) + set(${flags} "${${flags}} ${flag}") + endforeach() + endforeach() + endforeach() +endmacro() + +# ucm_set_linker_flags +# Sets the CMAKE__LINKER_FLAGS linker flags or for a specific config +macro(ucm_set_linker_flags) + ucm_add_linker_flags(CLEAR_OLD ${ARGN}) +endmacro() + +# ucm_gather_flags +# Gathers all lists of flags for printing or manipulation +macro(ucm_gather_flags with_linker result) + set(${result} "") + # add the main flags without a config + list(APPEND ${result} CMAKE_C_FLAGS) + list(APPEND ${result} CMAKE_CXX_FLAGS) + if(${with_linker}) + list(APPEND ${result} CMAKE_EXE_LINKER_FLAGS) + list(APPEND ${result} CMAKE_MODULE_LINKER_FLAGS) + list(APPEND ${result} CMAKE_SHARED_LINKER_FLAGS) + list(APPEND ${result} CMAKE_STATIC_LINKER_FLAGS) + endif() + + if("${CMAKE_CONFIGURATION_TYPES}" STREQUAL "" AND NOT "${CMAKE_BUILD_TYPE}" STREQUAL "") + # handle single config generators - like makefiles/ninja - when CMAKE_BUILD_TYPE is set + string(TOUPPER ${CMAKE_BUILD_TYPE} config) + list(APPEND ${result} CMAKE_C_FLAGS_${config}) + list(APPEND ${result} CMAKE_CXX_FLAGS_${config}) + if(${with_linker}) + list(APPEND ${result} CMAKE_EXE_LINKER_FLAGS_${config}) + list(APPEND ${result} CMAKE_MODULE_LINKER_FLAGS_${config}) + list(APPEND ${result} CMAKE_SHARED_LINKER_FLAGS_${config}) + list(APPEND ${result} CMAKE_STATIC_LINKER_FLAGS_${config}) + endif() + else() + # handle multi config generators (like msvc, xcode) + foreach(config ${CMAKE_CONFIGURATION_TYPES}) + string(TOUPPER ${config} config) + list(APPEND ${result} CMAKE_C_FLAGS_${config}) + list(APPEND ${result} CMAKE_CXX_FLAGS_${config}) + if(${with_linker}) + list(APPEND ${result} CMAKE_EXE_LINKER_FLAGS_${config}) + list(APPEND ${result} CMAKE_MODULE_LINKER_FLAGS_${config}) + list(APPEND ${result} CMAKE_SHARED_LINKER_FLAGS_${config}) + list(APPEND ${result} CMAKE_STATIC_LINKER_FLAGS_${config}) + endif() + endforeach() + endif() +endmacro() + +# ucm_set_runtime +# Sets the runtime (static/dynamic) for msvc/gcc +macro(ucm_set_runtime) + cmake_parse_arguments(ARG "STATIC;DYNAMIC" "" "" ${ARGN}) + + if(ARG_UNPARSED_ARGUMENTS) + message(FATAL_ERROR "unrecognized arguments: ${ARG_UNPARSED_ARGUMENTS}") + endif() + + if(CMAKE_CXX_COMPILER_ID MATCHES "Clang" STREQUAL "") + message(AUTHOR_WARNING "ucm_set_runtime() does not support clang yet!") + endif() + + ucm_gather_flags(0 flags_configs) + + # add/replace the flags + # note that if the user has messed with the flags directly this function might fail + # - for example if with MSVC and the user has removed the flags - here we just switch/replace them + if("${ARG_STATIC}") + foreach(flags ${flags_configs}) + if(CMAKE_CXX_COMPILER_ID MATCHES "GNU" OR CMAKE_C_COMPILER_ID MATCHES "GNU") + if (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 4.4.7) # option "-static-libstdc++" available since GCC 4.5 + if(NOT ${flags} MATCHES "-static-libstdc\\+\\+") + set(${flags} "${${flags}} -static-libstdc++") + endif() + endif() + if(NOT ${flags} MATCHES "-static-libgcc") + set(${flags} "${${flags}} -static-libgcc") + endif() + elseif(MSVC) + if(${flags} MATCHES "/MD") + string(REGEX REPLACE "/MD" "/MT" ${flags} "${${flags}}") + endif() + endif() + endforeach() + elseif("${ARG_DYNAMIC}") + foreach(flags ${flags_configs}) + if(CMAKE_CXX_COMPILER_ID MATCHES "GNU" OR CMAKE_C_COMPILER_ID MATCHES "GNU") + if(${flags} MATCHES "-static-libstdc\\+\\+") + string(REGEX REPLACE "-static-libstdc\\+\\+" "" ${flags} "${${flags}}") + endif() + if(${flags} MATCHES "-static-libgcc") + string(REGEX REPLACE "-static-libgcc" "" ${flags} "${${flags}}") + endif() + elseif(MSVC) + if(${flags} MATCHES "/MT") + string(REGEX REPLACE "/MT" "/MD" ${flags} "${${flags}}") + endif() + endif() + endforeach() + endif() +endmacro() + +# ucm_print_flags +# Prints all compiler flags for all configurations +macro(ucm_print_flags) + ucm_gather_flags(1 flags_configs) + message("") + foreach(flags ${flags_configs}) + message("${flags}: ${${flags}}") + endforeach() + message("") +endmacro() + +# ucm_count_sources +# Counts the number of source files +macro(ucm_count_sources) + cmake_parse_arguments(ARG "" "RESULT" "" ${ARGN}) + if(${ARG_RESULT} STREQUAL "") + message(FATAL_ERROR "Need to pass RESULT and a variable name to ucm_count_sources()") + endif() + + set(result 0) + foreach(SOURCE_FILE ${ARG_UNPARSED_ARGUMENTS}) + if("${SOURCE_FILE}" MATCHES \\.\(c|C|cc|cp|cpp|CPP|c\\+\\+|cxx|i|ii\)$) + math(EXPR result "${result} + 1") + endif() + endforeach() + set(${ARG_RESULT} ${result}) +endmacro() + +# ucm_include_file_in_sources +# Includes the file to the source with compiler flags +macro(ucm_include_file_in_sources) + cmake_parse_arguments(ARG "" "HEADER" "" ${ARGN}) + if(${ARG_HEADER} STREQUAL "") + message(FATAL_ERROR "Need to pass HEADER and a header file to ucm_include_file_in_sources()") + endif() + + foreach(src ${ARG_UNPARSED_ARGUMENTS}) + if(${src} MATCHES \\.\(c|C|cc|cp|cpp|CPP|c\\+\\+|cxx\)$) + # get old flags + get_source_file_property(old_compile_flags ${src} COMPILE_FLAGS) + if(old_compile_flags STREQUAL "NOTFOUND") + set(old_compile_flags "") + endif() + + # update flags + if(MSVC) + set_source_files_properties(${src} PROPERTIES COMPILE_FLAGS + "${old_compile_flags} /FI\"${CMAKE_CURRENT_SOURCE_DIR}/${ARG_HEADER}\"") + else() + set_source_files_properties(${src} PROPERTIES COMPILE_FLAGS + "${old_compile_flags} -include \"${CMAKE_CURRENT_SOURCE_DIR}/${ARG_HEADER}\"") + endif() + endif() + endforeach() +endmacro() + +# ucm_dir_list +# Returns a list of subdirectories for a given directory +macro(ucm_dir_list thedir result) + file(GLOB sub-dir "${thedir}/*") + set(list_of_dirs "") + foreach(dir ${sub-dir}) + if(IS_DIRECTORY ${dir}) + get_filename_component(DIRNAME ${dir} NAME) + LIST(APPEND list_of_dirs ${DIRNAME}) + endif() + endforeach() + set(${result} ${list_of_dirs}) +endmacro() + +# ucm_trim_front_words +# Trims X times the front word from a string separated with "/" and removes +# the front "/" characters after that (used for filters for visual studio) +macro(ucm_trim_front_words source out num_filter_trims) + set(result "${source}") + set(counter 0) + while(${counter} LESS ${num_filter_trims}) + MATH(EXPR counter "${counter} + 1") + # removes everything at the front up to a "/" character + string(REGEX REPLACE "^([^/]+)" "" result "${result}") + # removes all consecutive "/" characters from the front + string(REGEX REPLACE "^(/+)" "" result "${result}") + endwhile() + set(${out} ${result}) +endmacro() + +# ucm_remove_files +# Removes source files from a list of sources (path is the relative path for it to be found) +macro(ucm_remove_files) + cmake_parse_arguments(ARG "" "FROM" "" ${ARGN}) + + if("${ARG_UNPARSED_ARGUMENTS}" STREQUAL "") + message(FATAL_ERROR "Need to pass some relative files to ucm_remove_files()") + endif() + if(${ARG_FROM} STREQUAL "") + message(FATAL_ERROR "Need to pass FROM and a variable name to ucm_remove_files()") + endif() + + foreach(cur_file ${ARG_UNPARSED_ARGUMENTS}) + list(REMOVE_ITEM ${ARG_FROM} ${cur_file}) + endforeach() +endmacro() + +# ucm_remove_directories +# Removes all source files from the given directories from the sources list +macro(ucm_remove_directories) + cmake_parse_arguments(ARG "" "FROM" "MATCHES" ${ARGN}) + + if("${ARG_UNPARSED_ARGUMENTS}" STREQUAL "") + message(FATAL_ERROR "Need to pass some relative directories to ucm_remove_directories()") + endif() + if(${ARG_FROM} STREQUAL "") + message(FATAL_ERROR "Need to pass FROM and a variable name to ucm_remove_directories()") + endif() + + foreach(cur_dir ${ARG_UNPARSED_ARGUMENTS}) + foreach(cur_file ${${ARG_FROM}}) + string(REGEX MATCH ${cur_dir} res ${cur_file}) + if(NOT "${res}" STREQUAL "") + if("${ARG_MATCHES}" STREQUAL "") + list(REMOVE_ITEM ${ARG_FROM} ${cur_file}) + else() + foreach(curr_ptrn ${ARG_MATCHES}) + string(REGEX MATCH ${curr_ptrn} res ${cur_file}) + if(NOT "${res}" STREQUAL "") + list(REMOVE_ITEM ${ARG_FROM} ${cur_file}) + break() + endif() + endforeach() + endif() + endif() + endforeach() + endforeach() +endmacro() + +# ucm_add_files_impl +macro(ucm_add_files_impl result trim files) + foreach(cur_file ${files}) + SET(${result} ${${result}} ${cur_file}) + get_filename_component(FILEPATH ${cur_file} PATH) + ucm_trim_front_words("${FILEPATH}" FILEPATH "${trim}") + # replacing forward slashes with back slashes so filters can be generated (back slash used in parsing...) + STRING(REPLACE "/" "\\" FILTERS "${FILEPATH}") + SOURCE_GROUP("${FILTERS}" FILES ${cur_file}) + endforeach() +endmacro() + +# ucm_add_files +# Adds files to a list of sources +macro(ucm_add_files) + cmake_parse_arguments(ARG "" "TO;FILTER_POP" "" ${ARGN}) + + if("${ARG_UNPARSED_ARGUMENTS}" STREQUAL "") + message(FATAL_ERROR "Need to pass some relative files to ucm_add_files()") + endif() + if(${ARG_TO} STREQUAL "") + message(FATAL_ERROR "Need to pass TO and a variable name to ucm_add_files()") + endif() + + if("${ARG_FILTER_POP}" STREQUAL "") + set(ARG_FILTER_POP 0) + endif() + + ucm_add_files_impl(${ARG_TO} ${ARG_FILTER_POP} "${ARG_UNPARSED_ARGUMENTS}") +endmacro() + +# ucm_add_dir_impl +macro(ucm_add_dir_impl result rec trim dirs_in additional_ext) + set(dirs "${dirs_in}") + + # handle the "" and "." cases + if("${dirs}" STREQUAL "" OR "${dirs}" STREQUAL ".") + set(dirs "./") + endif() + + foreach(cur_dir ${dirs}) + # to circumvent some linux/cmake/path issues - barely made it work... + if(cur_dir STREQUAL "./") + set(cur_dir "") + else() + set(cur_dir "${cur_dir}/") + endif() + + # since unix is case sensitive - add these valid extensions too + # we don't use "UNIX" but instead "CMAKE_HOST_UNIX" because we might be cross + # compiling (for example emscripten) under windows and UNIX may be set to 1 + # Also OSX is case insensitive like windows... + set(additional_file_extensions "") + if(CMAKE_HOST_UNIX AND NOT APPLE) + set(additional_file_extensions + "${cur_dir}*.CPP" + "${cur_dir}*.C" + "${cur_dir}*.H" + "${cur_dir}*.HPP" + ) + endif() + + foreach(ext ${additional_ext}) + list(APPEND additional_file_extensions "${cur_dir}*.${ext}") + endforeach() + + # find all sources and set them as result + FILE(GLOB found_sources RELATIVE "${CMAKE_CURRENT_SOURCE_DIR}" + # https://gcc.gnu.org/onlinedocs/gcc-4.4.1/gcc/Overall-Options.html#index-file-name-suffix-71 + # sources + "${cur_dir}*.cpp" + "${cur_dir}*.cxx" + "${cur_dir}*.c++" + "${cur_dir}*.cc" + "${cur_dir}*.cp" + "${cur_dir}*.c" + "${cur_dir}*.i" + "${cur_dir}*.ii" + # headers + "${cur_dir}*.h" + "${cur_dir}*.h++" + "${cur_dir}*.hpp" + "${cur_dir}*.hxx" + "${cur_dir}*.hh" + "${cur_dir}*.inl" + "${cur_dir}*.inc" + "${cur_dir}*.ipp" + "${cur_dir}*.ixx" + "${cur_dir}*.txx" + "${cur_dir}*.tpp" + "${cur_dir}*.tcc" + "${cur_dir}*.tpl" + ${additional_file_extensions}) + SET(${result} ${${result}} ${found_sources}) + + # set the proper filters + ucm_trim_front_words("${cur_dir}" cur_dir "${trim}") + # replacing forward slashes with back slashes so filters can be generated (back slash used in parsing...) + STRING(REPLACE "/" "\\" FILTERS "${cur_dir}") + SOURCE_GROUP("${FILTERS}" FILES ${found_sources}) + endforeach() + + if(${rec}) + foreach(cur_dir ${dirs}) + ucm_dir_list("${cur_dir}" subdirs) + foreach(subdir ${subdirs}) + ucm_add_dir_impl(${result} ${rec} ${trim} "${cur_dir}/${subdir}" "${additional_ext}") + endforeach() + endforeach() + endif() +endmacro() + +# ucm_add_dirs +# Adds all files from directories traversing them recursively to a list of sources +# and generates filters according to their location (accepts relative paths only). +# Also this macro trims X times the front word from the filter string for visual studio filters. +macro(ucm_add_dirs) + cmake_parse_arguments(ARG "RECURSIVE" "TO;FILTER_POP" "ADDITIONAL_EXT" ${ARGN}) + + if(${ARG_TO} STREQUAL "") + message(FATAL_ERROR "Need to pass TO and a variable name to ucm_add_dirs()") + endif() + + if("${ARG_FILTER_POP}" STREQUAL "") + set(ARG_FILTER_POP 0) + endif() + + ucm_add_dir_impl(${ARG_TO} ${ARG_RECURSIVE} ${ARG_FILTER_POP} "${ARG_UNPARSED_ARGUMENTS}" "${ARG_ADDITIONAL_EXT}") +endmacro() + +# ucm_add_target +# Adds a target eligible for cotiring - unity build and/or precompiled header +macro(ucm_add_target) + cmake_parse_arguments(ARG "UNITY" "NAME;TYPE;PCH_FILE;CPP_PER_UNITY" "UNITY_EXCLUDED;SOURCES" ${ARGN}) + + if(NOT "${ARG_UNPARSED_ARGUMENTS}" STREQUAL "") + message(FATAL_ERROR "Unrecognized options passed to ucm_add_target()") + endif() + if("${ARG_NAME}" STREQUAL "") + message(FATAL_ERROR "Need to pass NAME and a name for the target to ucm_add_target()") + endif() + set(valid_types EXECUTABLE STATIC SHARED MODULE) + list(FIND valid_types "${ARG_TYPE}" is_type_valid) + if(${is_type_valid} STREQUAL "-1") + message(FATAL_ERROR "Need to pass TYPE and the type for the target [EXECUTABLE/STATIC/SHARED/MODULE] to ucm_add_target()") + endif() + if("${ARG_SOURCES}" STREQUAL "") + message(FATAL_ERROR "Need to pass SOURCES and a list of source files to ucm_add_target()") + endif() + + # init with the global unity flag + set(do_unity ${UCM_UNITY_BUILD}) + + # check the UNITY argument + if(NOT ARG_UNITY) + set(do_unity FALSE) + endif() + + # if target is excluded through the exclusion list + list(FIND UCM_UNITY_BUILD_EXCLUDE_TARGETS ${ARG_NAME} is_target_excluded) + if(NOT ${is_target_excluded} STREQUAL "-1") + set(do_unity FALSE) + endif() + + # unity build only for targets with > 1 source file (otherwise there will be an additional unnecessary target) + if(do_unity) # optimization + ucm_count_sources(${ARG_SOURCES} RESULT num_sources) + if(${num_sources} LESS 2) + set(do_unity FALSE) + endif() + endif() + + set(wanted_cotire ${do_unity}) + + # if cotire cannot be used + if(do_unity AND NOT ucm_with_cotire) + set(do_unity FALSE) + endif() + + # inform the developer that the current target might benefit from a unity build + if(NOT ARG_UNITY AND ${UCM_UNITY_BUILD}) + ucm_count_sources(${ARG_SOURCES} RESULT num_sources) + if(${num_sources} GREATER 1) + message(AUTHOR_WARNING "Target '${ARG_NAME}' may benefit from a unity build.\nIt has ${num_sources} sources - enable with UNITY flag") + endif() + endif() + + # prepare for the unity build + set(orig_target ${ARG_NAME}) + if(do_unity) + # the original target will be added with a different name than the requested + set(orig_target ${ARG_NAME}_ORIGINAL) + + # exclude requested files from unity build of the current target + foreach(excluded_file "${ARG_UNITY_EXCLUDED}") + set_source_files_properties(${excluded_file} PROPERTIES COTIRE_EXCLUDED TRUE) + endforeach() + endif() + + # add the original target + if(${ARG_TYPE} STREQUAL "EXECUTABLE") + add_executable(${orig_target} ${ARG_SOURCES}) + else() + add_library(${orig_target} ${ARG_TYPE} ${ARG_SOURCES}) + endif() + + if(do_unity) + # set the number of unity cpp files to be used for the unity target + if(NOT "${ARG_CPP_PER_UNITY}" STREQUAL "") + set_property(TARGET ${orig_target} PROPERTY COTIRE_UNITY_SOURCE_MAXIMUM_NUMBER_OF_INCLUDES "${ARG_CPP_PER_UNITY}") + else() + set_property(TARGET ${orig_target} PROPERTY COTIRE_UNITY_SOURCE_MAXIMUM_NUMBER_OF_INCLUDES "100") + endif() + + if(NOT "${ARG_PCH_FILE}" STREQUAL "") + set_target_properties(${orig_target} PROPERTIES COTIRE_CXX_PREFIX_HEADER_INIT "${ARG_PCH_FILE}") + else() + set_target_properties(${orig_target} PROPERTIES COTIRE_ENABLE_PRECOMPILED_HEADER FALSE) + endif() + # add a unity target for the original one with the name intended for the original + set_target_properties(${orig_target} PROPERTIES COTIRE_UNITY_TARGET_NAME ${ARG_NAME}) + + # this is the library call that does the magic + cotire(${orig_target}) + set_target_properties(clean_cotire PROPERTIES FOLDER "CMakePredefinedTargets") + + # disable the original target and enable the unity one + get_target_property(unity_target_name ${orig_target} COTIRE_UNITY_TARGET_NAME) + set_target_properties(${orig_target} PROPERTIES EXCLUDE_FROM_ALL 1 EXCLUDE_FROM_DEFAULT_BUILD 1) + set_target_properties(${unity_target_name} PROPERTIES EXCLUDE_FROM_ALL 0 EXCLUDE_FROM_DEFAULT_BUILD 0) + + # also set the name of the target output as the original one + set_target_properties(${unity_target_name} PROPERTIES OUTPUT_NAME ${ARG_NAME}) + if(UCM_NO_COTIRE_FOLDER) + # reset the folder property so all unity targets dont end up in a single folder in the solution explorer of VS + set_target_properties(${unity_target_name} PROPERTIES FOLDER "") + endif() + set_target_properties(all_unity PROPERTIES FOLDER "CMakePredefinedTargets") + elseif(NOT "${ARG_PCH_FILE}" STREQUAL "") + set(wanted_cotire TRUE) + if(ucm_with_cotire) + set_target_properties(${orig_target} PROPERTIES COTIRE_ADD_UNITY_BUILD FALSE) + set_target_properties(${orig_target} PROPERTIES COTIRE_CXX_PREFIX_HEADER_INIT "${ARG_PCH_FILE}") + cotire(${orig_target}) + set_target_properties(clean_cotire PROPERTIES FOLDER "CMakePredefinedTargets") + endif() + endif() + + # print a message if the target was requested to be cotired but it couldn't + if(wanted_cotire AND NOT ucm_with_cotire) + if(NOT COMMAND cotire) + message(AUTHOR_WARNING "Target \"${ARG_NAME}\" not cotired because cotire isn't loaded") + else() + message(AUTHOR_WARNING "Target \"${ARG_NAME}\" not cotired because cotire is older than the required version") + endif() + endif() +endmacro() diff --git a/zlib/uncompr.c b/external/zlib/uncompr.c similarity index 100% rename from zlib/uncompr.c rename to external/zlib/uncompr.c diff --git a/external/zlib/watcom/watcom_f.mak b/external/zlib/watcom/watcom_f.mak new file mode 100644 index 00000000..37f4d74c --- /dev/null +++ b/external/zlib/watcom/watcom_f.mak @@ -0,0 +1,43 @@ +# Makefile for zlib +# OpenWatcom flat model +# Last updated: 28-Dec-2005 + +# To use, do "wmake -f watcom_f.mak" + +C_SOURCE = adler32.c compress.c crc32.c deflate.c & + gzclose.c gzlib.c gzread.c gzwrite.c & + infback.c inffast.c inflate.c inftrees.c & + trees.c uncompr.c zutil.c + +OBJS = adler32.obj compress.obj crc32.obj deflate.obj & + gzclose.obj gzlib.obj gzread.obj gzwrite.obj & + infback.obj inffast.obj inflate.obj inftrees.obj & + trees.obj uncompr.obj zutil.obj + +CC = wcc386 +LINKER = wcl386 +CFLAGS = -zq -mf -3r -fp3 -s -bt=dos -oilrtfm -fr=nul -wx +ZLIB_LIB = zlib_f.lib + +.C.OBJ: + $(CC) $(CFLAGS) $[@ + +all: $(ZLIB_LIB) example.exe minigzip.exe + +$(ZLIB_LIB): $(OBJS) + wlib -b -c $(ZLIB_LIB) -+adler32.obj -+compress.obj -+crc32.obj + wlib -b -c $(ZLIB_LIB) -+gzclose.obj -+gzlib.obj -+gzread.obj -+gzwrite.obj + wlib -b -c $(ZLIB_LIB) -+deflate.obj -+infback.obj + wlib -b -c $(ZLIB_LIB) -+inffast.obj -+inflate.obj -+inftrees.obj + wlib -b -c $(ZLIB_LIB) -+trees.obj -+uncompr.obj -+zutil.obj + +example.exe: $(ZLIB_LIB) example.obj + $(LINKER) -ldos32a -fe=example.exe example.obj $(ZLIB_LIB) + +minigzip.exe: $(ZLIB_LIB) minigzip.obj + $(LINKER) -ldos32a -fe=minigzip.exe minigzip.obj $(ZLIB_LIB) + +clean: .SYMBOLIC + del *.obj + del $(ZLIB_LIB) + @echo Cleaning done diff --git a/external/zlib/watcom/watcom_l.mak b/external/zlib/watcom/watcom_l.mak new file mode 100644 index 00000000..193eed7b --- /dev/null +++ b/external/zlib/watcom/watcom_l.mak @@ -0,0 +1,43 @@ +# Makefile for zlib +# OpenWatcom large model +# Last updated: 28-Dec-2005 + +# To use, do "wmake -f watcom_l.mak" + +C_SOURCE = adler32.c compress.c crc32.c deflate.c & + gzclose.c gzlib.c gzread.c gzwrite.c & + infback.c inffast.c inflate.c inftrees.c & + trees.c uncompr.c zutil.c + +OBJS = adler32.obj compress.obj crc32.obj deflate.obj & + gzclose.obj gzlib.obj gzread.obj gzwrite.obj & + infback.obj inffast.obj inflate.obj inftrees.obj & + trees.obj uncompr.obj zutil.obj + +CC = wcc +LINKER = wcl +CFLAGS = -zq -ml -s -bt=dos -oilrtfm -fr=nul -wx +ZLIB_LIB = zlib_l.lib + +.C.OBJ: + $(CC) $(CFLAGS) $[@ + +all: $(ZLIB_LIB) example.exe minigzip.exe + +$(ZLIB_LIB): $(OBJS) + wlib -b -c $(ZLIB_LIB) -+adler32.obj -+compress.obj -+crc32.obj + wlib -b -c $(ZLIB_LIB) -+gzclose.obj -+gzlib.obj -+gzread.obj -+gzwrite.obj + wlib -b -c $(ZLIB_LIB) -+deflate.obj -+infback.obj + wlib -b -c $(ZLIB_LIB) -+inffast.obj -+inflate.obj -+inftrees.obj + wlib -b -c $(ZLIB_LIB) -+trees.obj -+uncompr.obj -+zutil.obj + +example.exe: $(ZLIB_LIB) example.obj + $(LINKER) -fe=example.exe example.obj $(ZLIB_LIB) + +minigzip.exe: $(ZLIB_LIB) minigzip.obj + $(LINKER) -fe=minigzip.exe minigzip.obj $(ZLIB_LIB) + +clean: .SYMBOLIC + del *.obj + del $(ZLIB_LIB) + @echo Cleaning done diff --git a/external/zlib/win32/DLL_FAQ.txt b/external/zlib/win32/DLL_FAQ.txt new file mode 100644 index 00000000..12c00901 --- /dev/null +++ b/external/zlib/win32/DLL_FAQ.txt @@ -0,0 +1,397 @@ + + Frequently Asked Questions about ZLIB1.DLL + + +This document describes the design, the rationale, and the usage +of the official DLL build of zlib, named ZLIB1.DLL. If you have +general questions about zlib, you should see the file "FAQ" found +in the zlib distribution, or at the following location: + http://www.gzip.org/zlib/zlib_faq.html + + + 1. What is ZLIB1.DLL, and how can I get it? + + - ZLIB1.DLL is the official build of zlib as a DLL. + (Please remark the character '1' in the name.) + + Pointers to a precompiled ZLIB1.DLL can be found in the zlib + web site at: + http://www.zlib.net/ + + Applications that link to ZLIB1.DLL can rely on the following + specification: + + * The exported symbols are exclusively defined in the source + files "zlib.h" and "zlib.def", found in an official zlib + source distribution. + * The symbols are exported by name, not by ordinal. + * The exported names are undecorated. + * The calling convention of functions is "C" (CDECL). + * The ZLIB1.DLL binary is linked to MSVCRT.DLL. + + The archive in which ZLIB1.DLL is bundled contains compiled + test programs that must run with a valid build of ZLIB1.DLL. + It is recommended to download the prebuilt DLL from the zlib + web site, instead of building it yourself, to avoid potential + incompatibilities that could be introduced by your compiler + and build settings. If you do build the DLL yourself, please + make sure that it complies with all the above requirements, + and it runs with the precompiled test programs, bundled with + the original ZLIB1.DLL distribution. + + If, for any reason, you need to build an incompatible DLL, + please use a different file name. + + + 2. Why did you change the name of the DLL to ZLIB1.DLL? + What happened to the old ZLIB.DLL? + + - The old ZLIB.DLL, built from zlib-1.1.4 or earlier, required + compilation settings that were incompatible to those used by + a static build. The DLL settings were supposed to be enabled + by defining the macro ZLIB_DLL, before including "zlib.h". + Incorrect handling of this macro was silently accepted at + build time, resulting in two major problems: + + * ZLIB_DLL was missing from the old makefile. When building + the DLL, not all people added it to the build options. In + consequence, incompatible incarnations of ZLIB.DLL started + to circulate around the net. + + * When switching from using the static library to using the + DLL, applications had to define the ZLIB_DLL macro and + to recompile all the sources that contained calls to zlib + functions. Failure to do so resulted in creating binaries + that were unable to run with the official ZLIB.DLL build. + + The only possible solution that we could foresee was to make + a binary-incompatible change in the DLL interface, in order to + remove the dependency on the ZLIB_DLL macro, and to release + the new DLL under a different name. + + We chose the name ZLIB1.DLL, where '1' indicates the major + zlib version number. We hope that we will not have to break + the binary compatibility again, at least not as long as the + zlib-1.x series will last. + + There is still a ZLIB_DLL macro, that can trigger a more + efficient build and use of the DLL, but compatibility no + longer dependents on it. + + + 3. Can I build ZLIB.DLL from the new zlib sources, and replace + an old ZLIB.DLL, that was built from zlib-1.1.4 or earlier? + + - In principle, you can do it by assigning calling convention + keywords to the macros ZEXPORT and ZEXPORTVA. In practice, + it depends on what you mean by "an old ZLIB.DLL", because the + old DLL exists in several mutually-incompatible versions. + You have to find out first what kind of calling convention is + being used in your particular ZLIB.DLL build, and to use the + same one in the new build. If you don't know what this is all + about, you might be better off if you would just leave the old + DLL intact. + + + 4. Can I compile my application using the new zlib interface, and + link it to an old ZLIB.DLL, that was built from zlib-1.1.4 or + earlier? + + - The official answer is "no"; the real answer depends again on + what kind of ZLIB.DLL you have. Even if you are lucky, this + course of action is unreliable. + + If you rebuild your application and you intend to use a newer + version of zlib (post- 1.1.4), it is strongly recommended to + link it to the new ZLIB1.DLL. + + + 5. Why are the zlib symbols exported by name, and not by ordinal? + + - Although exporting symbols by ordinal is a little faster, it + is risky. Any single glitch in the maintenance or use of the + DEF file that contains the ordinals can result in incompatible + builds and frustrating crashes. Simply put, the benefits of + exporting symbols by ordinal do not justify the risks. + + Technically, it should be possible to maintain ordinals in + the DEF file, and still export the symbols by name. Ordinals + exist in every DLL, and even if the dynamic linking performed + at the DLL startup is searching for names, ordinals serve as + hints, for a faster name lookup. However, if the DEF file + contains ordinals, the Microsoft linker automatically builds + an implib that will cause the executables linked to it to use + those ordinals, and not the names. It is interesting to + notice that the GNU linker for Win32 does not suffer from this + problem. + + It is possible to avoid the DEF file if the exported symbols + are accompanied by a "__declspec(dllexport)" attribute in the + source files. You can do this in zlib by predefining the + ZLIB_DLL macro. + + + 6. I see that the ZLIB1.DLL functions use the "C" (CDECL) calling + convention. Why not use the STDCALL convention? + STDCALL is the standard convention in Win32, and I need it in + my Visual Basic project! + + (For readability, we use CDECL to refer to the convention + triggered by the "__cdecl" keyword, STDCALL to refer to + the convention triggered by "__stdcall", and FASTCALL to + refer to the convention triggered by "__fastcall".) + + - Most of the native Windows API functions (without varargs) use + indeed the WINAPI convention (which translates to STDCALL in + Win32), but the standard C functions use CDECL. If a user + application is intrinsically tied to the Windows API (e.g. + it calls native Windows API functions such as CreateFile()), + sometimes it makes sense to decorate its own functions with + WINAPI. But if ANSI C or POSIX portability is a goal (e.g. + it calls standard C functions such as fopen()), it is not a + sound decision to request the inclusion of , or to + use non-ANSI constructs, for the sole purpose to make the user + functions STDCALL-able. + + The functionality offered by zlib is not in the category of + "Windows functionality", but is more like "C functionality". + + Technically, STDCALL is not bad; in fact, it is slightly + faster than CDECL, and it works with variable-argument + functions, just like CDECL. It is unfortunate that, in spite + of using STDCALL in the Windows API, it is not the default + convention used by the C compilers that run under Windows. + The roots of the problem reside deep inside the unsafety of + the K&R-style function prototypes, where the argument types + are not specified; but that is another story for another day. + + The remaining fact is that CDECL is the default convention. + Even if an explicit convention is hard-coded into the function + prototypes inside C headers, problems may appear. The + necessity to expose the convention in users' callbacks is one + of these problems. + + The calling convention issues are also important when using + zlib in other programming languages. Some of them, like Ada + (GNAT) and Fortran (GNU G77), have C bindings implemented + initially on Unix, and relying on the C calling convention. + On the other hand, the pre- .NET versions of Microsoft Visual + Basic require STDCALL, while Borland Delphi prefers, although + it does not require, FASTCALL. + + In fairness to all possible uses of zlib outside the C + programming language, we choose the default "C" convention. + Anyone interested in different bindings or conventions is + encouraged to maintain specialized projects. The "contrib/" + directory from the zlib distribution already holds a couple + of foreign bindings, such as Ada, C++, and Delphi. + + + 7. I need a DLL for my Visual Basic project. What can I do? + + - Define the ZLIB_WINAPI macro before including "zlib.h", when + building both the DLL and the user application (except that + you don't need to define anything when using the DLL in Visual + Basic). The ZLIB_WINAPI macro will switch on the WINAPI + (STDCALL) convention. The name of this DLL must be different + than the official ZLIB1.DLL. + + Gilles Vollant has contributed a build named ZLIBWAPI.DLL, + with the ZLIB_WINAPI macro turned on, and with the minizip + functionality built in. For more information, please read + the notes inside "contrib/vstudio/readme.txt", found in the + zlib distribution. + + + 8. I need to use zlib in my Microsoft .NET project. What can I + do? + + - Henrik Ravn has contributed a .NET wrapper around zlib. Look + into contrib/dotzlib/, inside the zlib distribution. + + + 9. If my application uses ZLIB1.DLL, should I link it to + MSVCRT.DLL? Why? + + - It is not required, but it is recommended to link your + application to MSVCRT.DLL, if it uses ZLIB1.DLL. + + The executables (.EXE, .DLL, etc.) that are involved in the + same process and are using the C run-time library (i.e. they + are calling standard C functions), must link to the same + library. There are several libraries in the Win32 system: + CRTDLL.DLL, MSVCRT.DLL, the static C libraries, etc. + Since ZLIB1.DLL is linked to MSVCRT.DLL, the executables that + depend on it should also be linked to MSVCRT.DLL. + + +10. Why are you saying that ZLIB1.DLL and my application should + be linked to the same C run-time (CRT) library? I linked my + application and my DLLs to different C libraries (e.g. my + application to a static library, and my DLLs to MSVCRT.DLL), + and everything works fine. + + - If a user library invokes only pure Win32 API (accessible via + and the related headers), its DLL build will work + in any context. But if this library invokes standard C API, + things get more complicated. + + There is a single Win32 library in a Win32 system. Every + function in this library resides in a single DLL module, that + is safe to call from anywhere. On the other hand, there are + multiple versions of the C library, and each of them has its + own separate internal state. Standalone executables and user + DLLs that call standard C functions must link to a C run-time + (CRT) library, be it static or shared (DLL). Intermixing + occurs when an executable (not necessarily standalone) and a + DLL are linked to different CRTs, and both are running in the + same process. + + Intermixing multiple CRTs is possible, as long as their + internal states are kept intact. The Microsoft Knowledge Base + articles KB94248 "HOWTO: Use the C Run-Time" and KB140584 + "HOWTO: Link with the Correct C Run-Time (CRT) Library" + mention the potential problems raised by intermixing. + + If intermixing works for you, it's because your application + and DLLs are avoiding the corruption of each of the CRTs' + internal states, maybe by careful design, or maybe by fortune. + + Also note that linking ZLIB1.DLL to non-Microsoft CRTs, such + as those provided by Borland, raises similar problems. + + +11. Why are you linking ZLIB1.DLL to MSVCRT.DLL? + + - MSVCRT.DLL exists on every Windows 95 with a new service pack + installed, or with Microsoft Internet Explorer 4 or later, and + on all other Windows 4.x or later (Windows 98, Windows NT 4, + or later). It is freely distributable; if not present in the + system, it can be downloaded from Microsoft or from other + software provider for free. + + The fact that MSVCRT.DLL does not exist on a virgin Windows 95 + is not so problematic. Windows 95 is scarcely found nowadays, + Microsoft ended its support a long time ago, and many recent + applications from various vendors, including Microsoft, do not + even run on it. Furthermore, no serious user should run + Windows 95 without a proper update installed. + + +12. Why are you not linking ZLIB1.DLL to + <> ? + + - We considered and abandoned the following alternatives: + + * Linking ZLIB1.DLL to a static C library (LIBC.LIB, or + LIBCMT.LIB) is not a good option. People are using the DLL + mainly to save disk space. If you are linking your program + to a static C library, you may as well consider linking zlib + in statically, too. + + * Linking ZLIB1.DLL to CRTDLL.DLL looks appealing, because + CRTDLL.DLL is present on every Win32 installation. + Unfortunately, it has a series of problems: it does not + work properly with Microsoft's C++ libraries, it does not + provide support for 64-bit file offsets, (and so on...), + and Microsoft discontinued its support a long time ago. + + * Linking ZLIB1.DLL to MSVCR70.DLL or MSVCR71.DLL, supplied + with the Microsoft .NET platform, and Visual C++ 7.0/7.1, + raises problems related to the status of ZLIB1.DLL as a + system component. According to the Microsoft Knowledge Base + article KB326922 "INFO: Redistribution of the Shared C + Runtime Component in Visual C++ .NET", MSVCR70.DLL and + MSVCR71.DLL are not supposed to function as system DLLs, + because they may clash with MSVCRT.DLL. Instead, the + application's installer is supposed to put these DLLs + (if needed) in the application's private directory. + If ZLIB1.DLL depends on a non-system runtime, it cannot + function as a redistributable system component. + + * Linking ZLIB1.DLL to non-Microsoft runtimes, such as + Borland's, or Cygwin's, raises problems related to the + reliable presence of these runtimes on Win32 systems. + It's easier to let the DLL build of zlib up to the people + who distribute these runtimes, and who may proceed as + explained in the answer to Question 14. + + +13. If ZLIB1.DLL cannot be linked to MSVCR70.DLL or MSVCR71.DLL, + how can I build/use ZLIB1.DLL in Microsoft Visual C++ 7.0 + (Visual Studio .NET) or newer? + + - Due to the problems explained in the Microsoft Knowledge Base + article KB326922 (see the previous answer), the C runtime that + comes with the VC7 environment is no longer considered a + system component. That is, it should not be assumed that this + runtime exists, or may be installed in a system directory. + Since ZLIB1.DLL is supposed to be a system component, it may + not depend on a non-system component. + + In order to link ZLIB1.DLL and your application to MSVCRT.DLL + in VC7, you need the library of Visual C++ 6.0 or older. If + you don't have this library at hand, it's probably best not to + use ZLIB1.DLL. + + We are hoping that, in the future, Microsoft will provide a + way to build applications linked to a proper system runtime, + from the Visual C++ environment. Until then, you have a + couple of alternatives, such as linking zlib in statically. + If your application requires dynamic linking, you may proceed + as explained in the answer to Question 14. + + +14. I need to link my own DLL build to a CRT different than + MSVCRT.DLL. What can I do? + + - Feel free to rebuild the DLL from the zlib sources, and link + it the way you want. You should, however, clearly state that + your build is unofficial. You should give it a different file + name, and/or install it in a private directory that can be + accessed by your application only, and is not visible to the + others (i.e. it's neither in the PATH, nor in the SYSTEM or + SYSTEM32 directories). Otherwise, your build may clash with + applications that link to the official build. + + For example, in Cygwin, zlib is linked to the Cygwin runtime + CYGWIN1.DLL, and it is distributed under the name CYGZ.DLL. + + +15. May I include additional pieces of code that I find useful, + link them in ZLIB1.DLL, and export them? + + - No. A legitimate build of ZLIB1.DLL must not include code + that does not originate from the official zlib source code. + But you can make your own private DLL build, under a different + file name, as suggested in the previous answer. + + For example, zlib is a part of the VCL library, distributed + with Borland Delphi and C++ Builder. The DLL build of VCL + is a redistributable file, named VCLxx.DLL. + + +16. May I remove some functionality out of ZLIB1.DLL, by enabling + macros like NO_GZCOMPRESS or NO_GZIP at compile time? + + - No. A legitimate build of ZLIB1.DLL must provide the complete + zlib functionality, as implemented in the official zlib source + code. But you can make your own private DLL build, under a + different file name, as suggested in the previous answer. + + +17. I made my own ZLIB1.DLL build. Can I test it for compliance? + + - We prefer that you download the official DLL from the zlib + web site. If you need something peculiar from this DLL, you + can send your suggestion to the zlib mailing list. + + However, in case you do rebuild the DLL yourself, you can run + it with the test programs found in the DLL distribution. + Running these test programs is not a guarantee of compliance, + but a failure can imply a detected problem. + +** + +This document is written and maintained by +Cosmin Truta diff --git a/external/zlib/win32/Makefile.bor b/external/zlib/win32/Makefile.bor new file mode 100644 index 00000000..d152bbb7 --- /dev/null +++ b/external/zlib/win32/Makefile.bor @@ -0,0 +1,110 @@ +# Makefile for zlib +# Borland C++ for Win32 +# +# Usage: +# make -f win32/Makefile.bor +# make -f win32/Makefile.bor LOCAL_ZLIB=-DASMV OBJA=match.obj OBJPA=+match.obj + +# ------------ Borland C++ ------------ + +# Optional nonstandard preprocessor flags (e.g. -DMAX_MEM_LEVEL=7) +# should be added to the environment via "set LOCAL_ZLIB=-DFOO" or +# added to the declaration of LOC here: +LOC = $(LOCAL_ZLIB) + +CC = bcc32 +AS = bcc32 +LD = bcc32 +AR = tlib +CFLAGS = -a -d -k- -O2 $(LOC) +ASFLAGS = $(LOC) +LDFLAGS = $(LOC) + + +# variables +ZLIB_LIB = zlib.lib + +OBJ1 = adler32.obj compress.obj crc32.obj deflate.obj gzclose.obj gzlib.obj gzread.obj +OBJ2 = gzwrite.obj infback.obj inffast.obj inflate.obj inftrees.obj trees.obj uncompr.obj zutil.obj +#OBJA = +OBJP1 = +adler32.obj+compress.obj+crc32.obj+deflate.obj+gzclose.obj+gzlib.obj+gzread.obj +OBJP2 = +gzwrite.obj+infback.obj+inffast.obj+inflate.obj+inftrees.obj+trees.obj+uncompr.obj+zutil.obj +#OBJPA= + + +# targets +all: $(ZLIB_LIB) example.exe minigzip.exe + +.c.obj: + $(CC) -c $(CFLAGS) $< + +.asm.obj: + $(AS) -c $(ASFLAGS) $< + +adler32.obj: adler32.c zlib.h zconf.h + +compress.obj: compress.c zlib.h zconf.h + +crc32.obj: crc32.c zlib.h zconf.h crc32.h + +deflate.obj: deflate.c deflate.h zutil.h zlib.h zconf.h + +gzclose.obj: gzclose.c zlib.h zconf.h gzguts.h + +gzlib.obj: gzlib.c zlib.h zconf.h gzguts.h + +gzread.obj: gzread.c zlib.h zconf.h gzguts.h + +gzwrite.obj: gzwrite.c zlib.h zconf.h gzguts.h + +infback.obj: infback.c zutil.h zlib.h zconf.h inftrees.h inflate.h \ + inffast.h inffixed.h + +inffast.obj: inffast.c zutil.h zlib.h zconf.h inftrees.h inflate.h \ + inffast.h + +inflate.obj: inflate.c zutil.h zlib.h zconf.h inftrees.h inflate.h \ + inffast.h inffixed.h + +inftrees.obj: inftrees.c zutil.h zlib.h zconf.h inftrees.h + +trees.obj: trees.c zutil.h zlib.h zconf.h deflate.h trees.h + +uncompr.obj: uncompr.c zlib.h zconf.h + +zutil.obj: zutil.c zutil.h zlib.h zconf.h + +example.obj: test/example.c zlib.h zconf.h + +minigzip.obj: test/minigzip.c zlib.h zconf.h + + +# For the sake of the old Borland make, +# the command line is cut to fit in the MS-DOS 128 byte limit: +$(ZLIB_LIB): $(OBJ1) $(OBJ2) $(OBJA) + -del $(ZLIB_LIB) + $(AR) $(ZLIB_LIB) $(OBJP1) + $(AR) $(ZLIB_LIB) $(OBJP2) + $(AR) $(ZLIB_LIB) $(OBJPA) + + +# testing +test: example.exe minigzip.exe + example + echo hello world | minigzip | minigzip -d + +example.exe: example.obj $(ZLIB_LIB) + $(LD) $(LDFLAGS) example.obj $(ZLIB_LIB) + +minigzip.exe: minigzip.obj $(ZLIB_LIB) + $(LD) $(LDFLAGS) minigzip.obj $(ZLIB_LIB) + + +# cleanup +clean: + -del $(ZLIB_LIB) + -del *.obj + -del *.exe + -del *.tds + -del zlib.bak + -del foo.gz diff --git a/external/zlib/win32/Makefile.gcc b/external/zlib/win32/Makefile.gcc new file mode 100644 index 00000000..6d1ded62 --- /dev/null +++ b/external/zlib/win32/Makefile.gcc @@ -0,0 +1,182 @@ +# Makefile for zlib, derived from Makefile.dj2. +# Modified for mingw32 by C. Spieler, 6/16/98. +# Updated for zlib 1.2.x by Christian Spieler and Cosmin Truta, Mar-2003. +# Last updated: Mar 2012. +# Tested under Cygwin and MinGW. + +# Copyright (C) 1995-2003 Jean-loup Gailly. +# For conditions of distribution and use, see copyright notice in zlib.h + +# To compile, or to compile and test, type from the top level zlib directory: +# +# make -fwin32/Makefile.gcc; make test testdll -fwin32/Makefile.gcc +# +# To use the asm code, type: +# cp contrib/asm?86/match.S ./match.S +# make LOC=-DASMV OBJA=match.o -fwin32/Makefile.gcc +# +# To install libz.a, zconf.h and zlib.h in the system directories, type: +# +# make install -fwin32/Makefile.gcc +# +# BINARY_PATH, INCLUDE_PATH and LIBRARY_PATH must be set. +# +# To install the shared lib, append SHARED_MODE=1 to the make command : +# +# make install -fwin32/Makefile.gcc SHARED_MODE=1 + +# Note: +# If the platform is *not* MinGW (e.g. it is Cygwin or UWIN), +# the DLL name should be changed from "zlib1.dll". + +STATICLIB = libz.a +SHAREDLIB = zlib1.dll +IMPLIB = libz.dll.a + +# +# Set to 1 if shared object needs to be installed +# +SHARED_MODE=0 + +#LOC = -DASMV +#LOC = -DDEBUG -g + +PREFIX = +CC = $(PREFIX)gcc +CFLAGS = $(LOC) -O3 -Wall + +AS = $(CC) +ASFLAGS = $(LOC) -Wall + +LD = $(CC) +LDFLAGS = $(LOC) + +AR = $(PREFIX)ar +ARFLAGS = rcs + +RC = $(PREFIX)windres +RCFLAGS = --define GCC_WINDRES + +STRIP = $(PREFIX)strip + +CP = cp -fp +# If GNU install is available, replace $(CP) with install. +INSTALL = $(CP) +RM = rm -f + +prefix ?= /usr/local +exec_prefix = $(prefix) + +OBJS = adler32.o compress.o crc32.o deflate.o gzclose.o gzlib.o gzread.o \ + gzwrite.o infback.o inffast.o inflate.o inftrees.o trees.o uncompr.o zutil.o +OBJA = + +all: $(STATICLIB) $(SHAREDLIB) $(IMPLIB) example.exe minigzip.exe example_d.exe minigzip_d.exe + +test: example.exe minigzip.exe + ./example + echo hello world | ./minigzip | ./minigzip -d + +testdll: example_d.exe minigzip_d.exe + ./example_d + echo hello world | ./minigzip_d | ./minigzip_d -d + +.c.o: + $(CC) $(CFLAGS) -c -o $@ $< + +.S.o: + $(AS) $(ASFLAGS) -c -o $@ $< + +$(STATICLIB): $(OBJS) $(OBJA) + $(AR) $(ARFLAGS) $@ $(OBJS) $(OBJA) + +$(IMPLIB): $(SHAREDLIB) + +$(SHAREDLIB): win32/zlib.def $(OBJS) $(OBJA) zlibrc.o + $(CC) -shared -Wl,--out-implib,$(IMPLIB) $(LDFLAGS) \ + -o $@ win32/zlib.def $(OBJS) $(OBJA) zlibrc.o + $(STRIP) $@ + +example.exe: example.o $(STATICLIB) + $(LD) $(LDFLAGS) -o $@ example.o $(STATICLIB) + $(STRIP) $@ + +minigzip.exe: minigzip.o $(STATICLIB) + $(LD) $(LDFLAGS) -o $@ minigzip.o $(STATICLIB) + $(STRIP) $@ + +example_d.exe: example.o $(IMPLIB) + $(LD) $(LDFLAGS) -o $@ example.o $(IMPLIB) + $(STRIP) $@ + +minigzip_d.exe: minigzip.o $(IMPLIB) + $(LD) $(LDFLAGS) -o $@ minigzip.o $(IMPLIB) + $(STRIP) $@ + +example.o: test/example.c zlib.h zconf.h + $(CC) $(CFLAGS) -I. -c -o $@ test/example.c + +minigzip.o: test/minigzip.c zlib.h zconf.h + $(CC) $(CFLAGS) -I. -c -o $@ test/minigzip.c + +zlibrc.o: win32/zlib1.rc + $(RC) $(RCFLAGS) -o $@ win32/zlib1.rc + +.PHONY: install uninstall clean + +install: zlib.h zconf.h $(STATICLIB) $(IMPLIB) + @if test -z "$(DESTDIR)$(INCLUDE_PATH)" -o -z "$(DESTDIR)$(LIBRARY_PATH)" -o -z "$(DESTDIR)$(BINARY_PATH)"; then \ + echo INCLUDE_PATH, LIBRARY_PATH, and BINARY_PATH must be specified; \ + exit 1; \ + fi + -@mkdir -p '$(DESTDIR)$(INCLUDE_PATH)' + -@mkdir -p '$(DESTDIR)$(LIBRARY_PATH)' '$(DESTDIR)$(LIBRARY_PATH)'/pkgconfig + -if [ "$(SHARED_MODE)" = "1" ]; then \ + mkdir -p '$(DESTDIR)$(BINARY_PATH)'; \ + $(INSTALL) $(SHAREDLIB) '$(DESTDIR)$(BINARY_PATH)'; \ + $(INSTALL) $(IMPLIB) '$(DESTDIR)$(LIBRARY_PATH)'; \ + fi + -$(INSTALL) zlib.h '$(DESTDIR)$(INCLUDE_PATH)' + -$(INSTALL) zconf.h '$(DESTDIR)$(INCLUDE_PATH)' + -$(INSTALL) $(STATICLIB) '$(DESTDIR)$(LIBRARY_PATH)' + sed \ + -e 's|@prefix@|${prefix}|g' \ + -e 's|@exec_prefix@|${exec_prefix}|g' \ + -e 's|@libdir@|$(LIBRARY_PATH)|g' \ + -e 's|@sharedlibdir@|$(LIBRARY_PATH)|g' \ + -e 's|@includedir@|$(INCLUDE_PATH)|g' \ + -e 's|@VERSION@|'`sed -n -e '/VERSION "/s/.*"\(.*\)".*/\1/p' zlib.h`'|g' \ + zlib.pc.in > '$(DESTDIR)$(LIBRARY_PATH)'/pkgconfig/zlib.pc + +uninstall: + -if [ "$(SHARED_MODE)" = "1" ]; then \ + $(RM) '$(DESTDIR)$(BINARY_PATH)'/$(SHAREDLIB); \ + $(RM) '$(DESTDIR)$(LIBRARY_PATH)'/$(IMPLIB); \ + fi + -$(RM) '$(DESTDIR)$(INCLUDE_PATH)'/zlib.h + -$(RM) '$(DESTDIR)$(INCLUDE_PATH)'/zconf.h + -$(RM) '$(DESTDIR)$(LIBRARY_PATH)'/$(STATICLIB) + +clean: + -$(RM) $(STATICLIB) + -$(RM) $(SHAREDLIB) + -$(RM) $(IMPLIB) + -$(RM) *.o + -$(RM) *.exe + -$(RM) foo.gz + +adler32.o: zlib.h zconf.h +compress.o: zlib.h zconf.h +crc32.o: crc32.h zlib.h zconf.h +deflate.o: deflate.h zutil.h zlib.h zconf.h +gzclose.o: zlib.h zconf.h gzguts.h +gzlib.o: zlib.h zconf.h gzguts.h +gzread.o: zlib.h zconf.h gzguts.h +gzwrite.o: zlib.h zconf.h gzguts.h +inffast.o: zutil.h zlib.h zconf.h inftrees.h inflate.h inffast.h +inflate.o: zutil.h zlib.h zconf.h inftrees.h inflate.h inffast.h +infback.o: zutil.h zlib.h zconf.h inftrees.h inflate.h inffast.h +inftrees.o: zutil.h zlib.h zconf.h inftrees.h +trees.o: deflate.h zutil.h zlib.h zconf.h trees.h +uncompr.o: zlib.h zconf.h +zutil.o: zutil.h zlib.h zconf.h diff --git a/external/zlib/win32/Makefile.msc b/external/zlib/win32/Makefile.msc new file mode 100755 index 00000000..14575fa7 --- /dev/null +++ b/external/zlib/win32/Makefile.msc @@ -0,0 +1,163 @@ +# Makefile for zlib using Microsoft (Visual) C +# zlib is copyright (C) 1995-2017 Jean-loup Gailly and Mark Adler +# +# Usage: +# nmake -f win32/Makefile.msc (standard build) +# nmake -f win32/Makefile.msc LOC=-DFOO (nonstandard build) +# nmake -f win32/Makefile.msc LOC="-DASMV -DASMINF" \ +# OBJA="inffas32.obj match686.obj" (use ASM code, x86) +# nmake -f win32/Makefile.msc AS=ml64 LOC="-DASMV -DASMINF -I." \ +# OBJA="inffasx64.obj gvmat64.obj inffas8664.obj" (use ASM code, x64) + +# The toplevel directory of the source tree. +# +TOP = . + +# optional build flags +LOC = + +# variables +STATICLIB = zlib.lib +SHAREDLIB = zlib1.dll +IMPLIB = zdll.lib + +CC = cl +AS = ml +LD = link +AR = lib +RC = rc +CFLAGS = -nologo -MD -W3 -O2 -Oy- -Zi -Fd"zlib" $(LOC) +WFLAGS = -DHAS_PCLMUL -D_CRT_SECURE_NO_DEPRECATE -D_CRT_NONSTDC_NO_DEPRECATE +ASFLAGS = -coff -Zi $(LOC) +LDFLAGS = -nologo -debug -incremental:no -opt:ref +ARFLAGS = -nologo +RCFLAGS = /dWIN32 /r + +OBJS = adler32.obj compress.obj crc32_simd.obj crc32.obj deflate.obj gzclose.obj gzlib.obj gzread.obj \ + gzwrite.obj infback.obj inflate.obj inftrees.obj inffast.obj trees.obj uncompr.obj zutil.obj +OBJA = + + +# targets +all: $(STATICLIB) $(SHAREDLIB) $(IMPLIB) \ + example.exe minigzip.exe example_d.exe minigzip_d.exe + +$(STATICLIB): $(OBJS) $(OBJA) + $(AR) $(ARFLAGS) -out:$@ $(OBJS) $(OBJA) + +$(IMPLIB): $(SHAREDLIB) + +$(SHAREDLIB): $(TOP)/win32/zlib.def $(OBJS) $(OBJA) zlib1.res + $(LD) $(LDFLAGS) -def:$(TOP)/win32/zlib.def -dll -implib:$(IMPLIB) \ + -out:$@ -base:0x5A4C0000 $(OBJS) $(OBJA) zlib1.res + if exist $@.manifest \ + mt -nologo -manifest $@.manifest -outputresource:$@;2 + +example.exe: example.obj $(STATICLIB) + $(LD) $(LDFLAGS) example.obj $(STATICLIB) + if exist $@.manifest \ + mt -nologo -manifest $@.manifest -outputresource:$@;1 + +minigzip.exe: minigzip.obj $(STATICLIB) + $(LD) $(LDFLAGS) minigzip.obj $(STATICLIB) + if exist $@.manifest \ + mt -nologo -manifest $@.manifest -outputresource:$@;1 + +example_d.exe: example.obj $(IMPLIB) + $(LD) $(LDFLAGS) -out:$@ example.obj $(IMPLIB) + if exist $@.manifest \ + mt -nologo -manifest $@.manifest -outputresource:$@;1 + +minigzip_d.exe: minigzip.obj $(IMPLIB) + $(LD) $(LDFLAGS) -out:$@ minigzip.obj $(IMPLIB) + if exist $@.manifest \ + mt -nologo -manifest $@.manifest -outputresource:$@;1 + +{$(TOP)}.c.obj: + $(CC) -c $(WFLAGS) $(CFLAGS) $< + +{$(TOP)/test}.c.obj: + $(CC) -c -I$(TOP) $(WFLAGS) $(CFLAGS) $< + +{$(TOP)/contrib/masmx64}.c.obj: + $(CC) -c $(WFLAGS) $(CFLAGS) $< + +{$(TOP)/contrib/masmx64}.asm.obj: + $(AS) -c $(ASFLAGS) $< + +{$(TOP)/contrib/masmx86}.asm.obj: + $(AS) -c $(ASFLAGS) $< + +adler32.obj: $(TOP)/adler32.c $(TOP)/zlib.h $(TOP)/zconf.h + +compress.obj: $(TOP)/compress.c $(TOP)/zlib.h $(TOP)/zconf.h + +crc32.obj: $(TOP)/crc32.c $(TOP)/zlib.h $(TOP)/zconf.h $(TOP)/crc32.h + +deflate.obj: $(TOP)/deflate.c $(TOP)/deflate.h $(TOP)/zutil.h $(TOP)/zlib.h $(TOP)/zconf.h + +gzclose.obj: $(TOP)/gzclose.c $(TOP)/zlib.h $(TOP)/zconf.h $(TOP)/gzguts.h + +gzlib.obj: $(TOP)/gzlib.c $(TOP)/zlib.h $(TOP)/zconf.h $(TOP)/gzguts.h + +gzread.obj: $(TOP)/gzread.c $(TOP)/zlib.h $(TOP)/zconf.h $(TOP)/gzguts.h + +gzwrite.obj: $(TOP)/gzwrite.c $(TOP)/zlib.h $(TOP)/zconf.h $(TOP)/gzguts.h + +infback.obj: $(TOP)/infback.c $(TOP)/zutil.h $(TOP)/zlib.h $(TOP)/zconf.h $(TOP)/inftrees.h $(TOP)/inflate.h \ + $(TOP)/inffast.h $(TOP)/inffixed.h + +inffast.obj: $(TOP)/inffast.c $(TOP)/zutil.h $(TOP)/zlib.h $(TOP)/zconf.h $(TOP)/inftrees.h $(TOP)/inflate.h \ + $(TOP)/inffast.h + +inflate.obj: $(TOP)/inflate.c $(TOP)/zutil.h $(TOP)/zlib.h $(TOP)/zconf.h $(TOP)/inftrees.h $(TOP)/inflate.h \ + $(TOP)/inffast.h $(TOP)/inffixed.h + +inftrees.obj: $(TOP)/inftrees.c $(TOP)/zutil.h $(TOP)/zlib.h $(TOP)/zconf.h $(TOP)/inftrees.h + +trees.obj: $(TOP)/trees.c $(TOP)/zutil.h $(TOP)/zlib.h $(TOP)/zconf.h $(TOP)/deflate.h $(TOP)/trees.h + +uncompr.obj: $(TOP)/uncompr.c $(TOP)/zlib.h $(TOP)/zconf.h + +zutil.obj: $(TOP)/zutil.c $(TOP)/zutil.h $(TOP)/zlib.h $(TOP)/zconf.h + +gvmat64.obj: $(TOP)/contrib\masmx64\gvmat64.asm + +inffasx64.obj: $(TOP)/contrib\masmx64\inffasx64.asm + +inffas8664.obj: $(TOP)/contrib\masmx64\inffas8664.c $(TOP)/zutil.h $(TOP)/zlib.h $(TOP)/zconf.h \ + $(TOP)/inftrees.h $(TOP)/inflate.h $(TOP)/inffast.h + +inffas32.obj: $(TOP)/contrib\masmx86\inffas32.asm + +match686.obj: $(TOP)/contrib\masmx86\match686.asm + +example.obj: $(TOP)/test/example.c $(TOP)/zlib.h $(TOP)/zconf.h + +minigzip.obj: $(TOP)/test/minigzip.c $(TOP)/zlib.h $(TOP)/zconf.h + +zlib1.res: $(TOP)/win32/zlib1.rc + $(RC) $(RCFLAGS) /fo$@ $(TOP)/win32/zlib1.rc + +# testing +test: example.exe minigzip.exe + example + echo hello world | minigzip | minigzip -d + +testdll: example_d.exe minigzip_d.exe + example_d + echo hello world | minigzip_d | minigzip_d -d + + +# cleanup +clean: + -del $(STATICLIB) + -del $(SHAREDLIB) + -del $(IMPLIB) + -del *.obj + -del *.res + -del *.exp + -del *.exe + -del *.pdb + -del *.manifest + -del foo.gz diff --git a/external/zlib/win32/README-WIN32.txt b/external/zlib/win32/README-WIN32.txt new file mode 100644 index 00000000..3d77d521 --- /dev/null +++ b/external/zlib/win32/README-WIN32.txt @@ -0,0 +1,103 @@ +ZLIB DATA COMPRESSION LIBRARY + +zlib 1.2.8 is a general purpose data compression library. All the code is +thread safe. The data format used by the zlib library is described by RFCs +(Request for Comments) 1950 to 1952 in the files +http://www.ietf.org/rfc/rfc1950.txt (zlib format), rfc1951.txt (deflate format) +and rfc1952.txt (gzip format). + +All functions of the compression library are documented in the file zlib.h +(volunteer to write man pages welcome, contact zlib@gzip.org). Two compiled +examples are distributed in this package, example and minigzip. The example_d +and minigzip_d flavors validate that the zlib1.dll file is working correctly. + +Questions about zlib should be sent to . The zlib home page +is http://zlib.net/ . Before reporting a problem, please check this site to +verify that you have the latest version of zlib; otherwise get the latest +version and check whether the problem still exists or not. + +PLEASE read DLL_FAQ.txt, and the the zlib FAQ http://zlib.net/zlib_faq.html +before asking for help. + + +Manifest: + +The package zlib-1.2.8-win32-x86.zip will contain the following files: + + README-WIN32.txt This document + ChangeLog Changes since previous zlib packages + DLL_FAQ.txt Frequently asked questions about zlib1.dll + zlib.3.pdf Documentation of this library in Adobe Acrobat format + + example.exe A statically-bound example (using zlib.lib, not the dll) + example.pdb Symbolic information for debugging example.exe + + example_d.exe A zlib1.dll bound example (using zdll.lib) + example_d.pdb Symbolic information for debugging example_d.exe + + minigzip.exe A statically-bound test program (using zlib.lib, not the dll) + minigzip.pdb Symbolic information for debugging minigzip.exe + + minigzip_d.exe A zlib1.dll bound test program (using zdll.lib) + minigzip_d.pdb Symbolic information for debugging minigzip_d.exe + + zlib.h Install these files into the compilers' INCLUDE path to + zconf.h compile programs which use zlib.lib or zdll.lib + + zdll.lib Install these files into the compilers' LIB path if linking + zdll.exp a compiled program to the zlib1.dll binary + + zlib.lib Install these files into the compilers' LIB path to link zlib + zlib.pdb into compiled programs, without zlib1.dll runtime dependency + (zlib.pdb provides debugging info to the compile time linker) + + zlib1.dll Install this binary shared library into the system PATH, or + the program's runtime directory (where the .exe resides) + zlib1.pdb Install in the same directory as zlib1.dll, in order to debug + an application crash using WinDbg or similar tools. + +All .pdb files above are entirely optional, but are very useful to a developer +attempting to diagnose program misbehavior or a crash. Many additional +important files for developers can be found in the zlib127.zip source package +available from http://zlib.net/ - review that package's README file for details. + + +Acknowledgments: + +The deflate format used by zlib was defined by Phil Katz. The deflate and +zlib specifications were written by L. Peter Deutsch. Thanks to all the +people who reported problems and suggested various improvements in zlib; they +are too numerous to cite here. + + +Copyright notice: + + (C) 1995-2012 Jean-loup Gailly and Mark Adler + + This software is provided 'as-is', without any express or implied + warranty. In no event will the authors be held liable for any damages + arising from the use of this software. + + Permission is granted to anyone to use this software for any purpose, + including commercial applications, and to alter it and redistribute it + freely, subject to the following restrictions: + + 1. The origin of this software must not be misrepresented; you must not + claim that you wrote the original software. If you use this software + in a product, an acknowledgment in the product documentation would be + appreciated but is not required. + 2. Altered source versions must be plainly marked as such, and must not be + misrepresented as being the original software. + 3. This notice may not be removed or altered from any source distribution. + + Jean-loup Gailly Mark Adler + jloup@gzip.org madler@alumni.caltech.edu + +If you use the zlib library in a product, we would appreciate *not* receiving +lengthy legal documents to sign. The sources are provided for free but without +warranty of any kind. The library has been entirely written by Jean-loup +Gailly and Mark Adler; it does not include third-party code. + +If you redistribute modified sources, we would appreciate that you include in +the file ChangeLog history information documenting your changes. Please read +the FAQ for more information on the distribution of modified source versions. diff --git a/external/zlib/win32/VisualC.txt b/external/zlib/win32/VisualC.txt new file mode 100644 index 00000000..579a5fc9 --- /dev/null +++ b/external/zlib/win32/VisualC.txt @@ -0,0 +1,3 @@ + +To build zlib using the Microsoft Visual C++ environment, +use the appropriate project from the projects/ directory. diff --git a/external/zlib/win32/zlib.def b/external/zlib/win32/zlib.def new file mode 100644 index 00000000..face6551 --- /dev/null +++ b/external/zlib/win32/zlib.def @@ -0,0 +1,86 @@ +; zlib data compression library +EXPORTS +; basic functions + zlibVersion + deflate + deflateEnd + inflate + inflateEnd +; advanced functions + deflateSetDictionary + deflateCopy + deflateReset + deflateParams + deflateTune + deflateBound + deflatePending + deflatePrime + deflateSetHeader + inflateSetDictionary + inflateGetDictionary + inflateSync + inflateCopy + inflateReset + inflateReset2 + inflatePrime + inflateMark + inflateGetHeader + inflateBack + inflateBackEnd + zlibCompileFlags +; utility functions + compress + compress2 + compressBound + uncompress + gzopen + gzdopen + gzbuffer + gzsetparams + gzread + gzwrite + gzprintf + gzvprintf + gzputs + gzgets + gzputc + gzgetc + gzungetc + gzflush + gzseek + gzrewind + gztell + gzoffset + gzeof + gzdirect + gzclose + gzclose_r + gzclose_w + gzerror + gzclearerr +; large file functions + gzopen64 + gzseek64 + gztell64 + gzoffset64 + adler32_combine64 + crc32_combine64 +; checksum functions + adler32 + crc32 + adler32_combine + crc32_combine +; various hacks, don't look :) + deflateInit_ + deflateInit2_ + inflateInit_ + inflateInit2_ + inflateBackInit_ + gzgetc_ + zError + inflateSyncPoint + get_crc_table + inflateUndermine + inflateResetKeep + deflateResetKeep + gzopen_w diff --git a/external/zlib/win32/zlib1.rc b/external/zlib/win32/zlib1.rc new file mode 100644 index 00000000..5c0feed1 --- /dev/null +++ b/external/zlib/win32/zlib1.rc @@ -0,0 +1,40 @@ +#include +#include "../zlib.h" + +#ifdef GCC_WINDRES +VS_VERSION_INFO VERSIONINFO +#else +VS_VERSION_INFO VERSIONINFO MOVEABLE IMPURE LOADONCALL DISCARDABLE +#endif + FILEVERSION ZLIB_VER_MAJOR,ZLIB_VER_MINOR,ZLIB_VER_REVISION,0 + PRODUCTVERSION ZLIB_VER_MAJOR,ZLIB_VER_MINOR,ZLIB_VER_REVISION,0 + FILEFLAGSMASK VS_FFI_FILEFLAGSMASK +#ifdef _DEBUG + FILEFLAGS 1 +#else + FILEFLAGS 0 +#endif + FILEOS VOS__WINDOWS32 + FILETYPE VFT_DLL + FILESUBTYPE 0 // not used +BEGIN + BLOCK "StringFileInfo" + BEGIN + BLOCK "040904E4" + //language ID = U.S. English, char set = Windows, Multilingual + BEGIN + VALUE "FileDescription", "zlib data compression library\0" + VALUE "FileVersion", ZLIB_VERSION "\0" + VALUE "InternalName", "zlib1.dll\0" + VALUE "LegalCopyright", "(C) 1995-2013 Jean-loup Gailly & Mark Adler\0" + VALUE "OriginalFilename", "zlib1.dll\0" + VALUE "ProductName", "zlib\0" + VALUE "ProductVersion", ZLIB_VERSION "\0" + VALUE "Comments", "For more information visit http://www.zlib.net/\0" + END + END + BLOCK "VarFileInfo" + BEGIN + VALUE "Translation", 0x0409, 1252 + END +END diff --git a/zlib/zconf.h b/external/zlib/zconf.h similarity index 100% rename from zlib/zconf.h rename to external/zlib/zconf.h diff --git a/zlib/zconf.h.cmakein b/external/zlib/zconf.h.cmakein similarity index 100% rename from zlib/zconf.h.cmakein rename to external/zlib/zconf.h.cmakein diff --git a/zlib/zconf.h.in b/external/zlib/zconf.h.in similarity index 100% rename from zlib/zconf.h.in rename to external/zlib/zconf.h.in diff --git a/external/zlib/zlib.3 b/external/zlib/zlib.3 new file mode 100644 index 00000000..0160e62b --- /dev/null +++ b/external/zlib/zlib.3 @@ -0,0 +1,151 @@ +.TH ZLIB 3 "28 Apr 2013" +.SH NAME +zlib \- compression/decompression library +.SH SYNOPSIS +[see +.I zlib.h +for full description] +.SH DESCRIPTION +The +.I zlib +library is a general purpose data compression library. +The code is thread safe, assuming that the standard library functions +used are thread safe, such as memory allocation routines. +It provides in-memory compression and decompression functions, +including integrity checks of the uncompressed data. +This version of the library supports only one compression method (deflation) +but other algorithms may be added later +with the same stream interface. +.LP +Compression can be done in a single step if the buffers are large enough +or can be done by repeated calls of the compression function. +In the latter case, +the application must provide more input and/or consume the output +(providing more output space) before each call. +.LP +The library also supports reading and writing files in +.IR gzip (1) +(.gz) format +with an interface similar to that of stdio. +.LP +The library does not install any signal handler. +The decoder checks the consistency of the compressed data, +so the library should never crash even in the case of corrupted input. +.LP +All functions of the compression library are documented in the file +.IR zlib.h . +The distribution source includes examples of use of the library +in the files +.I test/example.c +and +.IR test/minigzip.c, +as well as other examples in the +.IR examples/ +directory. +.LP +Changes to this version are documented in the file +.I ChangeLog +that accompanies the source. +.LP +.I zlib +is available in Java using the java.util.zip package: +.IP +http://java.sun.com/developer/technicalArticles/Programming/compression/ +.LP +A Perl interface to +.IR zlib , +written by Paul Marquess (pmqs@cpan.org), +is available at CPAN (Comprehensive Perl Archive Network) sites, +including: +.IP +http://search.cpan.org/~pmqs/IO-Compress-Zlib/ +.LP +A Python interface to +.IR zlib , +written by A.M. Kuchling (amk@magnet.com), +is available in Python 1.5 and later versions: +.IP +http://docs.python.org/library/zlib.html +.LP +.I zlib +is built into +.IR tcl: +.IP +http://wiki.tcl.tk/4610 +.LP +An experimental package to read and write files in .zip format, +written on top of +.I zlib +by Gilles Vollant (info@winimage.com), +is available at: +.IP +http://www.winimage.com/zLibDll/minizip.html +and also in the +.I contrib/minizip +directory of the main +.I zlib +source distribution. +.SH "SEE ALSO" +The +.I zlib +web site can be found at: +.IP +http://zlib.net/ +.LP +The data format used by the zlib library is described by RFC +(Request for Comments) 1950 to 1952 in the files: +.IP +http://tools.ietf.org/html/rfc1950 (for the zlib header and trailer format) +.br +http://tools.ietf.org/html/rfc1951 (for the deflate compressed data format) +.br +http://tools.ietf.org/html/rfc1952 (for the gzip header and trailer format) +.LP +Mark Nelson wrote an article about +.I zlib +for the Jan. 1997 issue of Dr. Dobb's Journal; +a copy of the article is available at: +.IP +http://marknelson.us/1997/01/01/zlib-engine/ +.SH "REPORTING PROBLEMS" +Before reporting a problem, +please check the +.I zlib +web site to verify that you have the latest version of +.IR zlib ; +otherwise, +obtain the latest version and see if the problem still exists. +Please read the +.I zlib +FAQ at: +.IP +http://zlib.net/zlib_faq.html +.LP +before asking for help. +Send questions and/or comments to zlib@gzip.org, +or (for the Windows DLL version) to Gilles Vollant (info@winimage.com). +.SH AUTHORS +Version 1.2.8 +Copyright (C) 1995-2013 Jean-loup Gailly (jloup@gzip.org) +and Mark Adler (madler@alumni.caltech.edu). +.LP +This software is provided "as-is," +without any express or implied warranty. +In no event will the authors be held liable for any damages +arising from the use of this software. +See the distribution directory with respect to requirements +governing redistribution. +The deflate format used by +.I zlib +was defined by Phil Katz. +The deflate and +.I zlib +specifications were written by L. Peter Deutsch. +Thanks to all the people who reported problems and suggested various +improvements in +.IR zlib ; +who are too numerous to cite here. +.LP +UNIX manual page by R. P. C. Rodgers, +U.S. National Library of Medicine (rodgers@nlm.nih.gov). +.\" end of man page diff --git a/external/zlib/zlib.3.pdf b/external/zlib/zlib.3.pdf new file mode 100644 index 00000000..e69de29b diff --git a/zlib/zlib.h b/external/zlib/zlib.h similarity index 100% rename from zlib/zlib.h rename to external/zlib/zlib.h diff --git a/zlib/zlib.map b/external/zlib/zlib.map similarity index 100% rename from zlib/zlib.map rename to external/zlib/zlib.map diff --git a/external/zlib/zlib.pc.cmakein b/external/zlib/zlib.pc.cmakein new file mode 100644 index 00000000..3017c695 --- /dev/null +++ b/external/zlib/zlib.pc.cmakein @@ -0,0 +1,13 @@ +prefix=@CMAKE_INSTALL_PREFIX@ +exec_prefix=@CMAKE_INSTALL_PREFIX@/bin +libdir=@CMAKE_INSTALL_PREFIX@/lib +sharedlibdir=@CMAKE_INSTALL_PREFIX@/lib +includedir=@CMAKE_INSTALL_PREFIX@/include + +Name: zlib +Description: zlib compression library +Version: @ZLIB_VERSION@ + +Requires: +Libs: -L${libdir} -L${sharedlibdir} -lz +Cflags: -I${includedir} diff --git a/zlib/zlib.pc.in b/external/zlib/zlib.pc.in similarity index 100% rename from zlib/zlib.pc.in rename to external/zlib/zlib.pc.in diff --git a/external/zlib/zlib2ansi b/external/zlib/zlib2ansi new file mode 100755 index 00000000..15e3e165 --- /dev/null +++ b/external/zlib/zlib2ansi @@ -0,0 +1,152 @@ +#!/usr/bin/perl + +# Transform K&R C function definitions into ANSI equivalent. +# +# Author: Paul Marquess +# Version: 1.0 +# Date: 3 October 2006 + +# TODO +# +# Asumes no function pointer parameters. unless they are typedefed. +# Assumes no literal strings that look like function definitions +# Assumes functions start at the beginning of a line + +use strict; +use warnings; + +local $/; +$_ = <>; + +my $sp = qr{ \s* (?: /\* .*? \*/ )? \s* }x; # assume no nested comments + +my $d1 = qr{ $sp (?: [\w\*\s]+ $sp)* $sp \w+ $sp [\[\]\s]* $sp }x ; +my $decl = qr{ $sp (?: \w+ $sp )+ $d1 }xo ; +my $dList = qr{ $sp $decl (?: $sp , $d1 )* $sp ; $sp }xo ; + + +while (s/^ + ( # Start $1 + ( # Start $2 + .*? # Minimal eat content + ( ^ \w [\w\s\*]+ ) # $3 -- function name + \s* # optional whitespace + ) # $2 - Matched up to before parameter list + + \( \s* # Literal "(" + optional whitespace + ( [^\)]+ ) # $4 - one or more anythings except ")" + \s* \) # optional whitespace surrounding a Literal ")" + + ( (?: $dList )+ ) # $5 + + $sp ^ { # literal "{" at start of line + ) # Remember to $1 + //xsom + ) +{ + my $all = $1 ; + my $prefix = $2; + my $param_list = $4 ; + my $params = $5; + + StripComments($params); + StripComments($param_list); + $param_list =~ s/^\s+//; + $param_list =~ s/\s+$//; + + my $i = 0 ; + my %pList = map { $_ => $i++ } + split /\s*,\s*/, $param_list; + my $pMatch = '(\b' . join('|', keys %pList) . '\b)\W*$' ; + + my @params = split /\s*;\s*/, $params; + my @outParams = (); + foreach my $p (@params) + { + if ($p =~ /,/) + { + my @bits = split /\s*,\s*/, $p; + my $first = shift @bits; + $first =~ s/^\s*//; + push @outParams, $first; + $first =~ /^(\w+\s*)/; + my $type = $1 ; + push @outParams, map { $type . $_ } @bits; + } + else + { + $p =~ s/^\s+//; + push @outParams, $p; + } + } + + + my %tmp = map { /$pMatch/; $_ => $pList{$1} } + @outParams ; + + @outParams = map { " $_" } + sort { $tmp{$a} <=> $tmp{$b} } + @outParams ; + + print $prefix ; + print "(\n" . join(",\n", @outParams) . ")\n"; + print "{" ; + +} + +# Output any trailing code. +print ; +exit 0; + + +sub StripComments +{ + + no warnings; + + # Strip C & C++ coments + # From the perlfaq + $_[0] =~ + + s{ + /\* ## Start of /* ... */ comment + [^*]*\*+ ## Non-* followed by 1-or-more *'s + ( + [^/*][^*]*\*+ + )* ## 0-or-more things which don't start with / + ## but do end with '*' + / ## End of /* ... */ comment + + | ## OR C++ Comment + // ## Start of C++ comment // + [^\n]* ## followed by 0-or-more non end of line characters + + | ## OR various things which aren't comments: + + ( + " ## Start of " ... " string + ( + \\. ## Escaped char + | ## OR + [^"\\] ## Non "\ + )* + " ## End of " ... " string + + | ## OR + + ' ## Start of ' ... ' string + ( + \\. ## Escaped char + | ## OR + [^'\\] ## Non '\ + )* + ' ## End of ' ... ' string + + | ## OR + + . ## Anything other char + [^/"'\\]* ## Chars which doesn't start a comment, string or escape + ) + }{$2}gxs; + +} diff --git a/zlib/zutil.c b/external/zlib/zutil.c similarity index 100% rename from zlib/zutil.c rename to external/zlib/zutil.c diff --git a/zlib/zutil.h b/external/zlib/zutil.h similarity index 100% rename from zlib/zutil.h rename to external/zlib/zutil.h diff --git a/external/zstd/CMakeLists.txt b/external/zstd/CMakeLists.txt new file mode 100644 index 00000000..5b4d262c --- /dev/null +++ b/external/zstd/CMakeLists.txt @@ -0,0 +1,33 @@ +PROJECT(zstd C ASM) + + +file(GLOB CommonSources lib/common/*.c) +file(GLOB CompressSources lib/compress/*.c) +file(GLOB DecompressSources lib/decompress/*.c ${LIBRARY_DIR}/decompress/*.S) +file(GLOB DictBuilderSources lib/dictBuilder/*.c) + +set(zstd_sources + ${CommonSources} + ${CompressSources} + ${DecompressSources} + ${DictBuilderSources}) + +INCLUDE_DIRECTORIES(lib) +INCLUDE_DIRECTORIES(lib/common) +INCLUDE_DIRECTORIES(lib/compress) +INCLUDE_DIRECTORIES(lib/decompress) +INCLUDE_DIRECTORIES(lib/dictBuilder) + +file(GLOB CommonHeaders lib/common/*.h) +file(GLOB CompressHeaders lib/compress/*.h) +file(GLOB DecompressHeaders lib/decompress/*.h) +file(GLOB DictBuilderHeaders lib/dictBuilder/*.h) + +set(zstd_headers + lib/zstd.h + ${CommonHeaders} + ${CompressHeaders} + ${DecompressHeaders} + ${DictBuilderHeaders}) + +ADD_LIBRARY(zstd STATIC ${zstd_sources} ${zstd_headers}) diff --git a/external/zstd/lib/.gitignore b/external/zstd/lib/.gitignore new file mode 100644 index 00000000..4cd50ac6 --- /dev/null +++ b/external/zstd/lib/.gitignore @@ -0,0 +1,3 @@ +# make install artefact +libzstd.pc +libzstd-nomt diff --git a/external/zstd/lib/BUCK b/external/zstd/lib/BUCK new file mode 100644 index 00000000..60c6bbb5 --- /dev/null +++ b/external/zstd/lib/BUCK @@ -0,0 +1,232 @@ +cxx_library( + name='zstd', + header_namespace='', + exported_headers=['zstd.h'], + visibility=['PUBLIC'], + deps=[ + ':common', + ':compress', + ':decompress', + ':deprecated', + ], +) + +cxx_library( + name='compress', + header_namespace='', + visibility=['PUBLIC'], + exported_headers=subdir_glob([ + ('compress', 'zstd*.h'), + ]), + srcs=glob(['compress/zstd*.c', 'compress/hist.c']), + deps=[':common'], +) + +cxx_library( + name='decompress', + header_namespace='', + visibility=['PUBLIC'], + headers=subdir_glob([ + ('decompress', '*_impl.h'), + ]), + srcs=glob(['decompress/zstd*.c']), + deps=[ + ':common', + ':legacy', + ], +) + +cxx_library( + name='deprecated', + header_namespace='', + visibility=['PUBLIC'], + exported_headers=subdir_glob([ + ('deprecated', '*.h'), + ]), + srcs=glob(['deprecated/*.c']), + deps=[':common'], +) + +cxx_library( + name='legacy', + header_namespace='', + visibility=['PUBLIC'], + exported_headers=subdir_glob([ + ('legacy', '*.h'), + ]), + srcs=glob(['legacy/*.c']), + deps=[':common'], + exported_preprocessor_flags=[ + '-DZSTD_LEGACY_SUPPORT=4', + ], +) + +cxx_library( + name='zdict', + header_namespace='', + visibility=['PUBLIC'], + exported_headers=['zdict.h'], + headers=subdir_glob([ + ('dictBuilder', 'divsufsort.h'), + ('dictBuilder', 'cover.h'), + ]), + srcs=glob(['dictBuilder/*.c']), + deps=[':common'], +) + +cxx_library( + name='compiler', + header_namespace='', + visibility=['PUBLIC'], + exported_headers=subdir_glob([ + ('common', 'compiler.h'), + ]), +) + +cxx_library( + name='cpu', + header_namespace='', + visibility=['PUBLIC'], + exported_headers=subdir_glob([ + ('common', 'cpu.h'), + ]), +) + +cxx_library( + name='bitstream', + header_namespace='', + visibility=['PUBLIC'], + exported_headers=subdir_glob([ + ('common', 'bitstream.h'), + ]), +) + +cxx_library( + name='entropy', + header_namespace='', + visibility=['PUBLIC'], + exported_headers=subdir_glob([ + ('common', 'fse.h'), + ('common', 'huf.h'), + ]), + srcs=[ + 'common/entropy_common.c', + 'common/fse_decompress.c', + 'compress/fse_compress.c', + 'compress/huf_compress.c', + 'decompress/huf_decompress.c', + ], + deps=[ + ':debug', + ':bitstream', + ':compiler', + ':errors', + ':mem', + ], +) + +cxx_library( + name='errors', + header_namespace='', + visibility=['PUBLIC'], + exported_headers=[ + 'zstd_errors.h', + 'common/error_private.h', + ] + srcs=['common/error_private.c'], +) + +cxx_library( + name='mem', + header_namespace='', + visibility=['PUBLIC'], + exported_headers=subdir_glob([ + ('common', 'mem.h'), + ]), +) + +cxx_library( + name='pool', + header_namespace='', + visibility=['PUBLIC'], + exported_headers=subdir_glob([ + ('common', 'pool.h'), + ]), + srcs=['common/pool.c'], + deps=[ + ':threading', + ':zstd_common', + ], +) + +cxx_library( + name='threading', + header_namespace='', + visibility=['PUBLIC'], + exported_headers=subdir_glob([ + ('common', 'threading.h'), + ]), + srcs=['common/threading.c'], + exported_preprocessor_flags=[ + '-DZSTD_MULTITHREAD', + ], + exported_linker_flags=[ + '-pthread', + ], +) + +cxx_library( + name='xxhash', + header_namespace='', + visibility=['PUBLIC'], + exported_headers=subdir_glob([ + ('common', 'xxhash.h'), + ]), + srcs=['common/xxhash.c'], + exported_preprocessor_flags=[ + '-DXXH_NAMESPACE=ZSTD_', + ], +) + +cxx_library( + name='zstd_common', + header_namespace='', + visibility=['PUBLIC'], + exported_headers=subdir_glob([ + ('', 'zstd.h'), + ('common', 'zstd_internal.h'), + ]), + srcs=['common/zstd_common.c'], + deps=[ + ':compiler', + ':errors', + ':mem', + ], +) + +cxx_library( + name='debug', + header_namespace='', + visibility=['PUBLIC'], + exported_headers=subdir_glob([ + ('common', 'debug.h'), + ]), + srcs=['common/debug.c'], +) + +cxx_library( + name='common', + deps=[ + ':debug', + ':bitstream', + ':compiler', + ':cpu', + ':entropy', + ':errors', + ':mem', + ':pool', + ':threading', + ':xxhash', + ':zstd_common', + ] +) diff --git a/external/zstd/lib/Makefile b/external/zstd/lib/Makefile new file mode 100644 index 00000000..9109476b --- /dev/null +++ b/external/zstd/lib/Makefile @@ -0,0 +1,482 @@ +# ################################################################ +# Copyright (c) Yann Collet, Facebook, Inc. +# All rights reserved. +# +# This source code is licensed under both the BSD-style license (found in the +# LICENSE file in the root directory of this source tree) and the GPLv2 (found +# in the COPYING file in the root directory of this source tree). +# You may select, at your option, one of the above-listed licenses. +# ################################################################ + +# Note: by default, the static library is built single-threaded and dynamic library is built +# multi-threaded. It is possible to force multi or single threaded builds by appending +# -mt or -nomt to the build target (like lib-mt for multi-threaded, lib-nomt for single-threaded). +.PHONY: default +default: lib-release + +# define silent mode as default (verbose mode with V=1 or VERBOSE=1) +$(V)$(VERBOSE).SILENT: + +# When cross-compiling from linux to windows, +# one might need to specify TARGET_SYSTEM as "Windows." +# Building from Fedora fails without it. +# (but Ubuntu and Debian don't need to set anything) +TARGET_SYSTEM ?= $(OS) + +# Version numbers +LIBVER_MAJOR_SCRIPT:=`sed -n '/define ZSTD_VERSION_MAJOR/s/.*[[:blank:]]\([0-9][0-9]*\).*/\1/p' < ./zstd.h` +LIBVER_MINOR_SCRIPT:=`sed -n '/define ZSTD_VERSION_MINOR/s/.*[[:blank:]]\([0-9][0-9]*\).*/\1/p' < ./zstd.h` +LIBVER_PATCH_SCRIPT:=`sed -n '/define ZSTD_VERSION_RELEASE/s/.*[[:blank:]]\([0-9][0-9]*\).*/\1/p' < ./zstd.h` +LIBVER_SCRIPT:= $(LIBVER_MAJOR_SCRIPT).$(LIBVER_MINOR_SCRIPT).$(LIBVER_PATCH_SCRIPT) +LIBVER_MAJOR := $(shell echo $(LIBVER_MAJOR_SCRIPT)) +LIBVER_MINOR := $(shell echo $(LIBVER_MINOR_SCRIPT)) +LIBVER_PATCH := $(shell echo $(LIBVER_PATCH_SCRIPT)) +LIBVER := $(shell echo $(LIBVER_SCRIPT)) +VERSION?= $(LIBVER) +CCVER := $(shell $(CC) --version) + +# ZSTD_LIB_MINIFY is a helper variable that +# configures a bunch of other variables to space-optimized defaults. +ZSTD_LIB_MINIFY ?= 0 +ifneq ($(ZSTD_LIB_MINIFY), 0) + HAVE_CC_OZ ?= $(shell echo "" | $(CC) -Oz -x c -c - -o /dev/null 2> /dev/null && echo 1 || echo 0) + ZSTD_LEGACY_SUPPORT ?= 0 + ZSTD_LIB_DEPRECATED ?= 0 + HUF_FORCE_DECOMPRESS_X1 ?= 1 + ZSTD_FORCE_DECOMPRESS_SHORT ?= 1 + ZSTD_NO_INLINE ?= 1 + ZSTD_STRIP_ERROR_STRINGS ?= 1 +ifneq ($(HAVE_CC_OZ), 0) + # Some compilers (clang) support an even more space-optimized setting. + CFLAGS += -Oz +else + CFLAGS += -Os +endif + CFLAGS += -fno-stack-protector -fomit-frame-pointer -fno-ident \ + -DDYNAMIC_BMI2=0 -DNDEBUG +else + CFLAGS += -O3 +endif + +DEBUGLEVEL ?= 0 +CPPFLAGS += -DXXH_NAMESPACE=ZSTD_ -DDEBUGLEVEL=$(DEBUGLEVEL) +ifeq ($(TARGET_SYSTEM),Windows_NT) # MinGW assumed + CPPFLAGS += -D__USE_MINGW_ANSI_STDIO # compatibility with %zu formatting +endif +DEBUGFLAGS= -Wall -Wextra -Wcast-qual -Wcast-align -Wshadow \ + -Wstrict-aliasing=1 -Wswitch-enum -Wdeclaration-after-statement \ + -Wstrict-prototypes -Wundef -Wpointer-arith \ + -Wvla -Wformat=2 -Winit-self -Wfloat-equal -Wwrite-strings \ + -Wredundant-decls -Wmissing-prototypes -Wc++-compat +CFLAGS += $(DEBUGFLAGS) $(MOREFLAGS) +FLAGS = $(CPPFLAGS) $(CFLAGS) + +CPPFLAGS_DYNLIB = -DZSTD_MULTITHREAD # dynamic library build defaults to multi-threaded +LDFLAGS_DYNLIB = -pthread +CPPFLAGS_STATLIB = # static library build defaults to single-threaded + +HAVE_COLORNEVER = $(shell echo a | grep --color=never a > /dev/null 2> /dev/null && echo 1 || echo 0) +GREP_OPTIONS ?= +ifeq ($HAVE_COLORNEVER, 1) + GREP_OPTIONS += --color=never +endif +GREP = grep $(GREP_OPTIONS) +SED_ERE_OPT ?= -E + +ZSTDCOMMON_FILES := $(sort $(wildcard common/*.c)) +ZSTDCOMP_FILES := $(sort $(wildcard compress/*.c)) +ZSTDDECOMP_FILES := $(sort $(wildcard decompress/*.c)) +ZDICT_FILES := $(sort $(wildcard dictBuilder/*.c)) +ZDEPR_FILES := $(sort $(wildcard deprecated/*.c)) +ZSTD_FILES := $(ZSTDCOMMON_FILES) + +ifeq ($(findstring GCC,$(CCVER)),GCC) +decompress/zstd_decompress_block.o : CFLAGS+=-fno-tree-vectorize +endif + +# Modules +ZSTD_LIB_COMPRESSION ?= 1 +ZSTD_LIB_DECOMPRESSION ?= 1 +ZSTD_LIB_DICTBUILDER ?= 1 +ZSTD_LIB_DEPRECATED ?= 0 + +# Legacy support +ZSTD_LEGACY_SUPPORT ?= 5 +ZSTD_LEGACY_MULTITHREADED_API ?= 0 + +# Build size optimizations +HUF_FORCE_DECOMPRESS_X1 ?= 0 +HUF_FORCE_DECOMPRESS_X2 ?= 0 +ZSTD_FORCE_DECOMPRESS_SHORT ?= 0 +ZSTD_FORCE_DECOMPRESS_LONG ?= 0 +ZSTD_NO_INLINE ?= 0 +ZSTD_STRIP_ERROR_STRINGS ?= 0 + +ifeq ($(ZSTD_LIB_COMPRESSION), 0) + ZSTD_LIB_DICTBUILDER = 0 + ZSTD_LIB_DEPRECATED = 0 +endif + +ifeq ($(ZSTD_LIB_DECOMPRESSION), 0) + ZSTD_LEGACY_SUPPORT = 0 + ZSTD_LIB_DEPRECATED = 0 +endif + +ifneq ($(ZSTD_LIB_COMPRESSION), 0) + ZSTD_FILES += $(ZSTDCOMP_FILES) +endif + +ifneq ($(ZSTD_LIB_DECOMPRESSION), 0) + ZSTD_FILES += $(ZSTDDECOMP_FILES) +endif + +ifneq ($(ZSTD_LIB_DEPRECATED), 0) + ZSTD_FILES += $(ZDEPR_FILES) +endif + +ifneq ($(ZSTD_LIB_DICTBUILDER), 0) + ZSTD_FILES += $(ZDICT_FILES) +endif + +ifneq ($(HUF_FORCE_DECOMPRESS_X1), 0) + CFLAGS += -DHUF_FORCE_DECOMPRESS_X1 +endif + +ifneq ($(HUF_FORCE_DECOMPRESS_X2), 0) + CFLAGS += -DHUF_FORCE_DECOMPRESS_X2 +endif + +ifneq ($(ZSTD_FORCE_DECOMPRESS_SHORT), 0) + CFLAGS += -DZSTD_FORCE_DECOMPRESS_SHORT +endif + +ifneq ($(ZSTD_FORCE_DECOMPRESS_LONG), 0) + CFLAGS += -DZSTD_FORCE_DECOMPRESS_LONG +endif + +ifneq ($(ZSTD_NO_INLINE), 0) + CFLAGS += -DZSTD_NO_INLINE +endif + +ifneq ($(ZSTD_STRIP_ERROR_STRINGS), 0) + CFLAGS += -DZSTD_STRIP_ERROR_STRINGS +endif + +ifneq ($(ZSTD_LEGACY_MULTITHREADED_API), 0) + CFLAGS += -DZSTD_LEGACY_MULTITHREADED_API +endif + +ifneq ($(ZSTD_LEGACY_SUPPORT), 0) +ifeq ($(shell test $(ZSTD_LEGACY_SUPPORT) -lt 8; echo $$?), 0) + ZSTD_FILES += $(shell ls legacy/*.c | $(GREP) 'v0[$(ZSTD_LEGACY_SUPPORT)-7]') +endif +endif +CPPFLAGS += -DZSTD_LEGACY_SUPPORT=$(ZSTD_LEGACY_SUPPORT) + +ZSTD_LOCAL_SRC := $(notdir $(ZSTD_FILES)) +ZSTD_LOCAL_OBJ := $(ZSTD_LOCAL_SRC:.c=.o) + +ZSTD_SUBDIR := common compress decompress dictBuilder legacy deprecated +vpath %.c $(ZSTD_SUBDIR) + +UNAME := $(shell uname) + +ifndef BUILD_DIR +ifeq ($(UNAME), Darwin) + ifeq ($(shell md5 < /dev/null > /dev/null; echo $$?), 0) + HASH ?= md5 + endif +else ifeq ($(UNAME), FreeBSD) + HASH ?= gmd5sum +else ifeq ($(UNAME), NetBSD) + HASH ?= md5 -n +else ifeq ($(UNAME), OpenBSD) + HASH ?= md5 +endif +HASH ?= md5sum + +HASH_DIR = conf_$(shell echo $(CC) $(CPPFLAGS) $(CFLAGS) $(LDFLAGS) $(ZSTD_FILES) | $(HASH) | cut -f 1 -d " " ) +HAVE_HASH :=$(shell echo 1 | $(HASH) > /dev/null && echo 1 || echo 0) +ifeq ($(HAVE_HASH),0) + $(info warning : could not find HASH ($(HASH)), needed to differentiate builds using different flags) + BUILD_DIR := obj/generic_noconf +endif +endif # BUILD_DIR + + +# macOS linker doesn't support -soname, and use different extension +# see : https://developer.apple.com/library/mac/documentation/DeveloperTools/Conceptual/DynamicLibraries/100-Articles/DynamicLibraryDesignGuidelines.html +ifeq ($(UNAME), Darwin) + SHARED_EXT = dylib + SHARED_EXT_MAJOR = $(LIBVER_MAJOR).$(SHARED_EXT) + SHARED_EXT_VER = $(LIBVER).$(SHARED_EXT) + SONAME_FLAGS = -install_name $(LIBDIR)/libzstd.$(SHARED_EXT_MAJOR) -compatibility_version $(LIBVER_MAJOR) -current_version $(LIBVER) +else + SONAME_FLAGS = -Wl,-soname=libzstd.$(SHARED_EXT).$(LIBVER_MAJOR) + SHARED_EXT = so + SHARED_EXT_MAJOR = $(SHARED_EXT).$(LIBVER_MAJOR) + SHARED_EXT_VER = $(SHARED_EXT).$(LIBVER) +endif + +SET_CACHE_DIRECTORY = \ + +$(MAKE) --no-print-directory $@ \ + BUILD_DIR=obj/$(HASH_DIR) \ + CPPFLAGS="$(CPPFLAGS)" \ + CFLAGS="$(CFLAGS)" \ + LDFLAGS="$(LDFLAGS)" + + +.PHONY: all +all: lib + + +.PHONY: libzstd.a # must be run every time +libzstd.a: CPPFLAGS += $(CPPFLAGS_STATLIB) + +ifndef BUILD_DIR +# determine BUILD_DIR from compilation flags + +libzstd.a: + $(SET_CACHE_DIRECTORY) + +else +# BUILD_DIR is defined + +ZSTD_STATLIB_DIR := $(BUILD_DIR)/static +ZSTD_STATLIB := $(ZSTD_STATLIB_DIR)/libzstd.a +ZSTD_STATLIB_OBJ := $(addprefix $(ZSTD_STATLIB_DIR)/,$(ZSTD_LOCAL_OBJ)) +$(ZSTD_STATLIB): ARFLAGS = rcs +$(ZSTD_STATLIB): | $(ZSTD_STATLIB_DIR) +$(ZSTD_STATLIB): $(ZSTD_STATLIB_OBJ) + # Check for multithread flag at target execution time + $(if $(filter -DZSTD_MULTITHREAD,$(CPPFLAGS)),\ + @echo compiling multi-threaded static library $(LIBVER),\ + @echo compiling single-threaded static library $(LIBVER)) + $(AR) $(ARFLAGS) $@ $^ + +libzstd.a: $(ZSTD_STATLIB) + cp -f $< $@ + +endif + +ifneq (,$(filter Windows%,$(TARGET_SYSTEM))) + +LIBZSTD = dll/libzstd.dll +$(LIBZSTD): $(ZSTD_FILES) + @echo compiling dynamic library $(LIBVER) + $(CC) $(FLAGS) -DZSTD_DLL_EXPORT=1 -Wl,--out-implib,dll/libzstd.dll.a -shared $^ -o $@ + +else # not Windows + +LIBZSTD = libzstd.$(SHARED_EXT_VER) +.PHONY: $(LIBZSTD) # must be run every time +$(LIBZSTD): CPPFLAGS += $(CPPFLAGS_DYNLIB) +$(LIBZSTD): CFLAGS += -fPIC -fvisibility=hidden +$(LIBZSTD): LDFLAGS += -shared $(LDFLAGS_DYNLIB) + +ifndef BUILD_DIR +# determine BUILD_DIR from compilation flags + +$(LIBZSTD): + $(SET_CACHE_DIRECTORY) + +else +# BUILD_DIR is defined + +ZSTD_DYNLIB_DIR := $(BUILD_DIR)/dynamic +ZSTD_DYNLIB := $(ZSTD_DYNLIB_DIR)/$(LIBZSTD) +ZSTD_DYNLIB_OBJ := $(addprefix $(ZSTD_DYNLIB_DIR)/,$(ZSTD_LOCAL_OBJ)) + +$(ZSTD_DYNLIB): | $(ZSTD_DYNLIB_DIR) +$(ZSTD_DYNLIB): $(ZSTD_DYNLIB_OBJ) +# Check for multithread flag at target execution time + $(if $(filter -DZSTD_MULTITHREAD,$(CPPFLAGS)),\ + @echo compiling multi-threaded dynamic library $(LIBVER),\ + @echo compiling single-threaded dynamic library $(LIBVER)) + $(CC) $(FLAGS) $^ $(LDFLAGS) $(SONAME_FLAGS) -o $@ + @echo creating versioned links + ln -sf $@ libzstd.$(SHARED_EXT_MAJOR) + ln -sf $@ libzstd.$(SHARED_EXT) + +$(LIBZSTD): $(ZSTD_DYNLIB) + cp -f $< $@ + +endif # ifndef BUILD_DIR +endif # if windows + +.PHONY: libzstd +libzstd : $(LIBZSTD) + +.PHONY: lib +lib : libzstd.a libzstd + + +# note : do not define lib-mt or lib-release as .PHONY +# make does not consider implicit pattern rule for .PHONY target + +%-mt : CPPFLAGS_DYNLIB := -DZSTD_MULTITHREAD +%-mt : CPPFLAGS_STATLIB := -DZSTD_MULTITHREAD +%-mt : LDFLAGS_DYNLIB := -pthread +%-mt : % + @echo multi-threaded build completed + +%-nomt : CPPFLAGS_DYNLIB := +%-nomt : LDFLAGS_DYNLIB := +%-nomt : CPPFLAGS_STATLIB := +%-nomt : % + @echo single-threaded build completed + +%-release : DEBUGFLAGS := +%-release : % + @echo release build completed + + +# Generate .h dependencies automatically + +DEPFLAGS = -MT $@ -MMD -MP -MF + +$(ZSTD_DYNLIB_DIR)/%.o : %.c $(ZSTD_DYNLIB_DIR)/%.d | $(ZSTD_DYNLIB_DIR) + @echo CC $@ + $(COMPILE.c) $(DEPFLAGS) $(ZSTD_DYNLIB_DIR)/$*.d $(OUTPUT_OPTION) $< + +$(ZSTD_STATLIB_DIR)/%.o : %.c $(ZSTD_STATLIB_DIR)/%.d | $(ZSTD_STATLIB_DIR) + @echo CC $@ + $(COMPILE.c) $(DEPFLAGS) $(ZSTD_STATLIB_DIR)/$*.d $(OUTPUT_OPTION) $< + +MKDIR ?= mkdir +$(BUILD_DIR) $(ZSTD_DYNLIB_DIR) $(ZSTD_STATLIB_DIR): + $(MKDIR) -p $@ + +DEPFILES := $(ZSTD_DYNLIB_OBJ:.o=.d) $(ZSTD_STATLIB_OBJ:.o=.d) +$(DEPFILES): + +include $(wildcard $(DEPFILES)) + + +# Special case : building library in single-thread mode _and_ without zstdmt_compress.c +ZSTDMT_FILES = compress/zstdmt_compress.c +ZSTD_NOMT_FILES = $(filter-out $(ZSTDMT_FILES),$(ZSTD_FILES)) +libzstd-nomt: CFLAGS += -fPIC -fvisibility=hidden +libzstd-nomt: LDFLAGS += -shared +libzstd-nomt: $(ZSTD_NOMT_FILES) + @echo compiling single-thread dynamic library $(LIBVER) + @echo files : $(ZSTD_NOMT_FILES) + $(CC) $(FLAGS) $^ $(LDFLAGS) $(SONAME_FLAGS) -o $@ + +.PHONY: clean +clean: + $(RM) -r *.dSYM # macOS-specific + $(RM) core *.o *.a *.gcda *.$(SHARED_EXT) *.$(SHARED_EXT).* libzstd.pc + $(RM) dll/libzstd.dll dll/libzstd.lib libzstd-nomt* + $(RM) -r obj/* + @echo Cleaning library completed + +#----------------------------------------------------------------------------- +# make install is validated only for below listed environments +#----------------------------------------------------------------------------- +ifneq (,$(filter $(UNAME),Linux Darwin GNU/kFreeBSD GNU OpenBSD FreeBSD NetBSD DragonFly SunOS Haiku)) + +all: libzstd.pc + +HAS_EXPLICIT_EXEC_PREFIX := $(if $(or $(EXEC_PREFIX),$(exec_prefix)),1,) + +DESTDIR ?= +# directory variables : GNU conventions prefer lowercase +# see https://www.gnu.org/prep/standards/html_node/Makefile-Conventions.html +# support both lower and uppercase (BSD), use uppercase in script +prefix ?= /usr/local +PREFIX ?= $(prefix) +exec_prefix ?= $(PREFIX) +EXEC_PREFIX ?= $(exec_prefix) +libdir ?= $(EXEC_PREFIX)/lib +LIBDIR ?= $(libdir) +includedir ?= $(PREFIX)/include +INCLUDEDIR ?= $(includedir) + +PCINCDIR := $(patsubst $(PREFIX)%,%,$(INCLUDEDIR)) +PCLIBDIR := $(patsubst $(EXEC_PREFIX)%,%,$(LIBDIR)) + +# If we successfully stripped off a prefix, we'll add a reference to the +# relevant pc variable. +PCINCPREFIX := $(if $(findstring $(INCLUDEDIR),$(PCINCDIR)),,$${prefix}) +PCLIBPREFIX := $(if $(findstring $(LIBDIR),$(PCLIBDIR)),,$${exec_prefix}) + +# If no explicit EXEC_PREFIX was set by the caller, write it out as a reference +# to PREFIX, rather than as a resolved value. +PCEXEC_PREFIX := $(if $(HAS_EXPLICIT_EXEC_PREFIX),$(EXEC_PREFIX),$${prefix}) + +ifneq (,$(filter $(UNAME),FreeBSD NetBSD DragonFly)) + PKGCONFIGDIR ?= $(PREFIX)/libdata/pkgconfig +else + PKGCONFIGDIR ?= $(LIBDIR)/pkgconfig +endif + +ifneq (,$(filter $(UNAME),SunOS)) + INSTALL ?= ginstall +else + INSTALL ?= install +endif + +INSTALL_PROGRAM ?= $(INSTALL) +INSTALL_DATA ?= $(INSTALL) -m 644 + + +libzstd.pc: +libzstd.pc: libzstd.pc.in + @echo creating pkgconfig + @sed $(SED_ERE_OPT) \ + -e 's|@PREFIX@|$(PREFIX)|' \ + -e 's|@EXEC_PREFIX@|$(PCEXEC_PREFIX)|' \ + -e 's|@INCLUDEDIR@|$(PCINCPREFIX)$(PCINCDIR)|' \ + -e 's|@LIBDIR@|$(PCLIBPREFIX)$(PCLIBDIR)|' \ + -e 's|@VERSION@|$(VERSION)|' \ + $< >$@ + +.PHONY: install +install: install-pc install-static install-shared install-includes + @echo zstd static and shared library installed + +.PHONY: install-pc +install-pc: libzstd.pc + [ -e $(DESTDIR)$(PKGCONFIGDIR) ] || $(INSTALL) -d -m 755 $(DESTDIR)$(PKGCONFIGDIR)/ + $(INSTALL_DATA) libzstd.pc $(DESTDIR)$(PKGCONFIGDIR)/ + +.PHONY: install-static +install-static: + # only generate libzstd.a if it's not already present + [ -e libzstd.a ] || $(MAKE) libzstd.a-release + [ -e $(DESTDIR)$(LIBDIR) ] || $(INSTALL) -d -m 755 $(DESTDIR)$(LIBDIR)/ + @echo Installing static library + $(INSTALL_DATA) libzstd.a $(DESTDIR)$(LIBDIR) + +.PHONY: install-shared +install-shared: + # only generate libzstd.so if it's not already present + [ -e $(LIBZSTD) ] || $(MAKE) libzstd-release + [ -e $(DESTDIR)$(LIBDIR) ] || $(INSTALL) -d -m 755 $(DESTDIR)$(LIBDIR)/ + @echo Installing shared library + $(INSTALL_PROGRAM) $(LIBZSTD) $(DESTDIR)$(LIBDIR) + ln -sf $(LIBZSTD) $(DESTDIR)$(LIBDIR)/libzstd.$(SHARED_EXT_MAJOR) + ln -sf $(LIBZSTD) $(DESTDIR)$(LIBDIR)/libzstd.$(SHARED_EXT) + +.PHONY: install-includes +install-includes: + [ -e $(DESTDIR)$(INCLUDEDIR) ] || $(INSTALL) -d -m 755 $(DESTDIR)$(INCLUDEDIR)/ + @echo Installing includes + $(INSTALL_DATA) zstd.h $(DESTDIR)$(INCLUDEDIR) + $(INSTALL_DATA) zstd_errors.h $(DESTDIR)$(INCLUDEDIR) + $(INSTALL_DATA) zdict.h $(DESTDIR)$(INCLUDEDIR) + +.PHONY: uninstall +uninstall: + $(RM) $(DESTDIR)$(LIBDIR)/libzstd.a + $(RM) $(DESTDIR)$(LIBDIR)/libzstd.$(SHARED_EXT) + $(RM) $(DESTDIR)$(LIBDIR)/libzstd.$(SHARED_EXT_MAJOR) + $(RM) $(DESTDIR)$(LIBDIR)/$(LIBZSTD) + $(RM) $(DESTDIR)$(PKGCONFIGDIR)/libzstd.pc + $(RM) $(DESTDIR)$(INCLUDEDIR)/zstd.h + $(RM) $(DESTDIR)$(INCLUDEDIR)/zstd_errors.h + $(RM) $(DESTDIR)$(INCLUDEDIR)/zdict.h + @echo zstd libraries successfully uninstalled + +endif diff --git a/external/zstd/lib/README.md b/external/zstd/lib/README.md new file mode 100644 index 00000000..f781ac57 --- /dev/null +++ b/external/zstd/lib/README.md @@ -0,0 +1,211 @@ +Zstandard library files +================================ + +The __lib__ directory is split into several sub-directories, +in order to make it easier to select or exclude features. + + +#### Building + +`Makefile` script is provided, supporting [Makefile conventions](https://www.gnu.org/prep/standards/html_node/Makefile-Conventions.html#Makefile-Conventions), +including commands variables, staged install, directory variables and standard targets. +- `make` : generates both static and dynamic libraries +- `make install` : install libraries and headers in target system directories + +`libzstd` default scope is pretty large, including compression, decompression, dictionary builder, +and support for decoding legacy formats >= v0.5.0. +The scope can be reduced on demand (see paragraph _modular build_). + + +#### Multithreading support + +When building with `make`, by default the dynamic library is multithreaded and static library is single-threaded (for compatibility reasons). + +Enabling multithreading requires 2 conditions : +- set build macro `ZSTD_MULTITHREAD` (`-DZSTD_MULTITHREAD` for `gcc`) +- for POSIX systems : compile with pthread (`-pthread` compilation flag for `gcc`) + +For convenience, we provide a build target to generate multi and single threaded libraries: +- Force enable multithreading on both dynamic and static libraries by appending `-mt` to the target, e.g. `make lib-mt`. +- Force disable multithreading on both dynamic and static libraries by appending `-nomt` to the target, e.g. `make lib-nomt`. +- By default, as mentioned before, dynamic library is multithreaded, and static library is single-threaded, e.g. `make lib`. + +When linking a POSIX program with a multithreaded version of `libzstd`, +note that it's necessary to invoke the `-pthread` flag during link stage. + +Multithreading capabilities are exposed +via the [advanced API defined in `lib/zstd.h`](https://github.com/facebook/zstd/blob/v1.4.3/lib/zstd.h#L351). + + +#### API + +Zstandard's stable API is exposed within [lib/zstd.h](zstd.h). + + +#### Advanced API + +Optional advanced features are exposed via : + +- `lib/zstd_errors.h` : translates `size_t` function results + into a `ZSTD_ErrorCode`, for accurate error handling. + +- `ZSTD_STATIC_LINKING_ONLY` : if this macro is defined _before_ including `zstd.h`, + it unlocks access to the experimental API, + exposed in the second part of `zstd.h`. + All definitions in the experimental APIs are unstable, + they may still change in the future, or even be removed. + As a consequence, experimental definitions shall ___never be used with dynamic library___ ! + Only static linking is allowed. + + +#### Modular build + +It's possible to compile only a limited set of features within `libzstd`. +The file structure is designed to make this selection manually achievable for any build system : + +- Directory `lib/common` is always required, for all variants. + +- Compression source code lies in `lib/compress` + +- Decompression source code lies in `lib/decompress` + +- It's possible to include only `compress` or only `decompress`, they don't depend on each other. + +- `lib/dictBuilder` : makes it possible to generate dictionaries from a set of samples. + The API is exposed in `lib/dictBuilder/zdict.h`. + This module depends on both `lib/common` and `lib/compress` . + +- `lib/legacy` : makes it possible to decompress legacy zstd formats, starting from `v0.1.0`. + This module depends on `lib/common` and `lib/decompress`. + To enable this feature, define `ZSTD_LEGACY_SUPPORT` during compilation. + Specifying a number limits versions supported to that version onward. + For example, `ZSTD_LEGACY_SUPPORT=2` means : "support legacy formats >= v0.2.0". + Conversely, `ZSTD_LEGACY_SUPPORT=0` means "do __not__ support legacy formats". + By default, this build macro is set as `ZSTD_LEGACY_SUPPORT=5`. + Decoding supported legacy format is a transparent capability triggered within decompression functions. + It's also allowed to invoke legacy API directly, exposed in `lib/legacy/zstd_legacy.h`. + Each version does also provide its own set of advanced API. + For example, advanced API for version `v0.4` is exposed in `lib/legacy/zstd_v04.h` . + +- While invoking `make libzstd`, it's possible to define build macros + `ZSTD_LIB_COMPRESSION, ZSTD_LIB_DECOMPRESSION`, `ZSTD_LIB_DICTBUILDER`, + and `ZSTD_LIB_DEPRECATED` as `0` to forgo compilation of the + corresponding features. This will also disable compilation of all + dependencies (eg. `ZSTD_LIB_COMPRESSION=0` will also disable + dictBuilder). + +- There are a number of options that can help minimize the binary size of + `libzstd`. + + The first step is to select the components needed (using the above-described + `ZSTD_LIB_COMPRESSION` etc.). + + The next step is to set `ZSTD_LIB_MINIFY` to `1` when invoking `make`. This + disables various optional components and changes the compilation flags to + prioritize space-saving. + + Detailed options: Zstandard's code and build environment is set up by default + to optimize above all else for performance. In pursuit of this goal, Zstandard + makes significant trade-offs in code size. For example, Zstandard often has + more than one implementation of a particular component, with each + implementation optimized for different scenarios. For example, the Huffman + decoder has complementary implementations that decode the stream one symbol at + a time or two symbols at a time. Zstd normally includes both (and dispatches + between them at runtime), but by defining `HUF_FORCE_DECOMPRESS_X1` or + `HUF_FORCE_DECOMPRESS_X2`, you can force the use of one or the other, avoiding + compilation of the other. Similarly, `ZSTD_FORCE_DECOMPRESS_SEQUENCES_SHORT` + and `ZSTD_FORCE_DECOMPRESS_SEQUENCES_LONG` force the compilation and use of + only one or the other of two decompression implementations. The smallest + binary is achieved by using `HUF_FORCE_DECOMPRESS_X1` and + `ZSTD_FORCE_DECOMPRESS_SEQUENCES_SHORT` (implied by `ZSTD_LIB_MINIFY`). + + For squeezing the last ounce of size out, you can also define + `ZSTD_NO_INLINE`, which disables inlining, and `ZSTD_STRIP_ERROR_STRINGS`, + which removes the error messages that are otherwise returned by + `ZSTD_getErrorName` (implied by `ZSTD_LIB_MINIFY`). + + Finally, when integrating into your application, make sure you're doing link- + time optimation and unused symbol garbage collection (via some combination of, + e.g., `-flto`, `-ffat-lto-objects`, `-fuse-linker-plugin`, + `-ffunction-sections`, `-fdata-sections`, `-fmerge-all-constants`, + `-Wl,--gc-sections`, `-Wl,-z,norelro`, and an archiver that understands + the compiler's intermediate representation, e.g., `AR=gcc-ar`). Consult your + compiler's documentation. + +- While invoking `make libzstd`, the build macro `ZSTD_LEGACY_MULTITHREADED_API=1` + will expose the deprecated `ZSTDMT` API exposed by `zstdmt_compress.h` in + the shared library, which is now hidden by default. + +- The build macro `DYNAMIC_BMI2` can be set to 1 or 0 in order to generate binaries + which can detect at runtime the presence of BMI2 instructions, and use them only if present. + These instructions contribute to better performance, notably on the decoder side. + By default, this feature is automatically enabled on detecting + the right instruction set (x64) and compiler (clang or gcc >= 5). + It's obviously disabled for different cpus, + or when BMI2 instruction set is _required_ by the compiler command line + (in this case, only the BMI2 code path is generated). + Setting this macro will either force to generate the BMI2 dispatcher (1) + or prevent it (0). It overrides automatic detection. + +- The build macro `ZSTD_NO_UNUSED_FUNCTIONS` can be defined to hide the definitions of functions + that zstd does not use. Not all unused functions are hidden, but they can be if needed. + Currently, this macro will hide function definitions in FSE and HUF that use an excessive + amount of stack space. + +- The build macro `ZSTD_NO_INTRINSICS` can be defined to disable all explicit intrinsics. + Compiler builtins are still used. + + +#### Windows : using MinGW+MSYS to create DLL + +DLL can be created using MinGW+MSYS with the `make libzstd` command. +This command creates `dll\libzstd.dll` and the import library `dll\libzstd.lib`. +The import library is only required with Visual C++. +The header file `zstd.h` and the dynamic library `dll\libzstd.dll` are required to +compile a project using gcc/MinGW. +The dynamic library has to be added to linking options. +It means that if a project that uses ZSTD consists of a single `test-dll.c` +file it should be linked with `dll\libzstd.dll`. For example: +``` + gcc $(CFLAGS) -Iinclude/ test-dll.c -o test-dll dll\libzstd.dll +``` +The compiled executable will require ZSTD DLL which is available at `dll\libzstd.dll`. + + +#### Advanced Build options + +The build system requires a hash function in order to +separate object files created with different compilation flags. +By default, it tries to use `md5sum` or equivalent. +The hash function can be manually switched by setting the `HASH` variable. +For example : `make HASH=xxhsum` +The hash function needs to generate at least 64-bit using hexadecimal format. +When no hash function is found, +the Makefile just generates all object files into the same default directory, +irrespective of compilation flags. +This functionality only matters if `libzstd` is compiled multiple times +with different build flags. + +The build directory, where object files are stored +can also be manually controlled using variable `BUILD_DIR`, +for example `make BUILD_DIR=objectDir/v1`. +In which case, the hash function doesn't matter. + + +#### Deprecated API + +Obsolete API on their way out are stored in directory `lib/deprecated`. +At this stage, it contains older streaming prototypes, in `lib/deprecated/zbuff.h`. +These prototypes will be removed in some future version. +Consider migrating code towards supported streaming API exposed in `zstd.h`. + + +#### Miscellaneous + +The other files are not source code. There are : + + - `BUCK` : support for `buck` build system (https://buckbuild.com/) + - `Makefile` : `make` script to build and install zstd library (static and dynamic) + - `README.md` : this file + - `dll/` : resources directory for Windows compilation + - `libzstd.pc.in` : script for `pkg-config` (used in `make install`) diff --git a/external/zstd/lib/common/bitstream.h b/external/zstd/lib/common/bitstream.h new file mode 100644 index 00000000..2e5a933a --- /dev/null +++ b/external/zstd/lib/common/bitstream.h @@ -0,0 +1,463 @@ +/* ****************************************************************** + * bitstream + * Part of FSE library + * Copyright (c) Yann Collet, Facebook, Inc. + * + * You can contact the author at : + * - Source repository : https://github.com/Cyan4973/FiniteStateEntropy + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. +****************************************************************** */ +#ifndef BITSTREAM_H_MODULE +#define BITSTREAM_H_MODULE + +#if defined (__cplusplus) +extern "C" { +#endif +/* +* This API consists of small unitary functions, which must be inlined for best performance. +* Since link-time-optimization is not available for all compilers, +* these functions are defined into a .h to be included. +*/ + +/*-**************************************** +* Dependencies +******************************************/ +#include "mem.h" /* unaligned access routines */ +#include "compiler.h" /* UNLIKELY() */ +#include "debug.h" /* assert(), DEBUGLOG(), RAWLOG() */ +#include "error_private.h" /* error codes and messages */ + + +/*========================================= +* Target specific +=========================================*/ +#ifndef ZSTD_NO_INTRINSICS +# if defined(__BMI__) && defined(__GNUC__) +# include /* support for bextr (experimental) */ +# elif defined(__ICCARM__) +# include +# endif +#endif + +#define STREAM_ACCUMULATOR_MIN_32 25 +#define STREAM_ACCUMULATOR_MIN_64 57 +#define STREAM_ACCUMULATOR_MIN ((U32)(MEM_32bits() ? STREAM_ACCUMULATOR_MIN_32 : STREAM_ACCUMULATOR_MIN_64)) + + +/*-****************************************** +* bitStream encoding API (write forward) +********************************************/ +/* bitStream can mix input from multiple sources. + * A critical property of these streams is that they encode and decode in **reverse** direction. + * So the first bit sequence you add will be the last to be read, like a LIFO stack. + */ +typedef struct { + size_t bitContainer; + unsigned bitPos; + char* startPtr; + char* ptr; + char* endPtr; +} BIT_CStream_t; + +MEM_STATIC size_t BIT_initCStream(BIT_CStream_t* bitC, void* dstBuffer, size_t dstCapacity); +MEM_STATIC void BIT_addBits(BIT_CStream_t* bitC, size_t value, unsigned nbBits); +MEM_STATIC void BIT_flushBits(BIT_CStream_t* bitC); +MEM_STATIC size_t BIT_closeCStream(BIT_CStream_t* bitC); + +/* Start with initCStream, providing the size of buffer to write into. +* bitStream will never write outside of this buffer. +* `dstCapacity` must be >= sizeof(bitD->bitContainer), otherwise @return will be an error code. +* +* bits are first added to a local register. +* Local register is size_t, hence 64-bits on 64-bits systems, or 32-bits on 32-bits systems. +* Writing data into memory is an explicit operation, performed by the flushBits function. +* Hence keep track how many bits are potentially stored into local register to avoid register overflow. +* After a flushBits, a maximum of 7 bits might still be stored into local register. +* +* Avoid storing elements of more than 24 bits if you want compatibility with 32-bits bitstream readers. +* +* Last operation is to close the bitStream. +* The function returns the final size of CStream in bytes. +* If data couldn't fit into `dstBuffer`, it will return a 0 ( == not storable) +*/ + + +/*-******************************************** +* bitStream decoding API (read backward) +**********************************************/ +typedef struct { + size_t bitContainer; + unsigned bitsConsumed; + const char* ptr; + const char* start; + const char* limitPtr; +} BIT_DStream_t; + +typedef enum { BIT_DStream_unfinished = 0, + BIT_DStream_endOfBuffer = 1, + BIT_DStream_completed = 2, + BIT_DStream_overflow = 3 } BIT_DStream_status; /* result of BIT_reloadDStream() */ + /* 1,2,4,8 would be better for bitmap combinations, but slows down performance a bit ... :( */ + +MEM_STATIC size_t BIT_initDStream(BIT_DStream_t* bitD, const void* srcBuffer, size_t srcSize); +MEM_STATIC size_t BIT_readBits(BIT_DStream_t* bitD, unsigned nbBits); +MEM_STATIC BIT_DStream_status BIT_reloadDStream(BIT_DStream_t* bitD); +MEM_STATIC unsigned BIT_endOfDStream(const BIT_DStream_t* bitD); + + +/* Start by invoking BIT_initDStream(). +* A chunk of the bitStream is then stored into a local register. +* Local register size is 64-bits on 64-bits systems, 32-bits on 32-bits systems (size_t). +* You can then retrieve bitFields stored into the local register, **in reverse order**. +* Local register is explicitly reloaded from memory by the BIT_reloadDStream() method. +* A reload guarantee a minimum of ((8*sizeof(bitD->bitContainer))-7) bits when its result is BIT_DStream_unfinished. +* Otherwise, it can be less than that, so proceed accordingly. +* Checking if DStream has reached its end can be performed with BIT_endOfDStream(). +*/ + + +/*-**************************************** +* unsafe API +******************************************/ +MEM_STATIC void BIT_addBitsFast(BIT_CStream_t* bitC, size_t value, unsigned nbBits); +/* faster, but works only if value is "clean", meaning all high bits above nbBits are 0 */ + +MEM_STATIC void BIT_flushBitsFast(BIT_CStream_t* bitC); +/* unsafe version; does not check buffer overflow */ + +MEM_STATIC size_t BIT_readBitsFast(BIT_DStream_t* bitD, unsigned nbBits); +/* faster, but works only if nbBits >= 1 */ + + + +/*-************************************************************** +* Internal functions +****************************************************************/ +MEM_STATIC unsigned BIT_highbit32 (U32 val) +{ + assert(val != 0); + { +# if defined(_MSC_VER) /* Visual */ +# if STATIC_BMI2 == 1 + return _lzcnt_u32(val) ^ 31; +# else + unsigned long r = 0; + return _BitScanReverse(&r, val) ? (unsigned)r : 0; +# endif +# elif defined(__GNUC__) && (__GNUC__ >= 3) /* Use GCC Intrinsic */ + return __builtin_clz (val) ^ 31; +# elif defined(__ICCARM__) /* IAR Intrinsic */ + return 31 - __CLZ(val); +# else /* Software version */ + static const unsigned DeBruijnClz[32] = { 0, 9, 1, 10, 13, 21, 2, 29, + 11, 14, 16, 18, 22, 25, 3, 30, + 8, 12, 20, 28, 15, 17, 24, 7, + 19, 27, 23, 6, 26, 5, 4, 31 }; + U32 v = val; + v |= v >> 1; + v |= v >> 2; + v |= v >> 4; + v |= v >> 8; + v |= v >> 16; + return DeBruijnClz[ (U32) (v * 0x07C4ACDDU) >> 27]; +# endif + } +} + +/*===== Local Constants =====*/ +static const unsigned BIT_mask[] = { + 0, 1, 3, 7, 0xF, 0x1F, + 0x3F, 0x7F, 0xFF, 0x1FF, 0x3FF, 0x7FF, + 0xFFF, 0x1FFF, 0x3FFF, 0x7FFF, 0xFFFF, 0x1FFFF, + 0x3FFFF, 0x7FFFF, 0xFFFFF, 0x1FFFFF, 0x3FFFFF, 0x7FFFFF, + 0xFFFFFF, 0x1FFFFFF, 0x3FFFFFF, 0x7FFFFFF, 0xFFFFFFF, 0x1FFFFFFF, + 0x3FFFFFFF, 0x7FFFFFFF}; /* up to 31 bits */ +#define BIT_MASK_SIZE (sizeof(BIT_mask) / sizeof(BIT_mask[0])) + +/*-************************************************************** +* bitStream encoding +****************************************************************/ +/*! BIT_initCStream() : + * `dstCapacity` must be > sizeof(size_t) + * @return : 0 if success, + * otherwise an error code (can be tested using ERR_isError()) */ +MEM_STATIC size_t BIT_initCStream(BIT_CStream_t* bitC, + void* startPtr, size_t dstCapacity) +{ + bitC->bitContainer = 0; + bitC->bitPos = 0; + bitC->startPtr = (char*)startPtr; + bitC->ptr = bitC->startPtr; + bitC->endPtr = bitC->startPtr + dstCapacity - sizeof(bitC->bitContainer); + if (dstCapacity <= sizeof(bitC->bitContainer)) return ERROR(dstSize_tooSmall); + return 0; +} + +/*! BIT_addBits() : + * can add up to 31 bits into `bitC`. + * Note : does not check for register overflow ! */ +MEM_STATIC void BIT_addBits(BIT_CStream_t* bitC, + size_t value, unsigned nbBits) +{ + DEBUG_STATIC_ASSERT(BIT_MASK_SIZE == 32); + assert(nbBits < BIT_MASK_SIZE); + assert(nbBits + bitC->bitPos < sizeof(bitC->bitContainer) * 8); + bitC->bitContainer |= (value & BIT_mask[nbBits]) << bitC->bitPos; + bitC->bitPos += nbBits; +} + +/*! BIT_addBitsFast() : + * works only if `value` is _clean_, + * meaning all high bits above nbBits are 0 */ +MEM_STATIC void BIT_addBitsFast(BIT_CStream_t* bitC, + size_t value, unsigned nbBits) +{ + assert((value>>nbBits) == 0); + assert(nbBits + bitC->bitPos < sizeof(bitC->bitContainer) * 8); + bitC->bitContainer |= value << bitC->bitPos; + bitC->bitPos += nbBits; +} + +/*! BIT_flushBitsFast() : + * assumption : bitContainer has not overflowed + * unsafe version; does not check buffer overflow */ +MEM_STATIC void BIT_flushBitsFast(BIT_CStream_t* bitC) +{ + size_t const nbBytes = bitC->bitPos >> 3; + assert(bitC->bitPos < sizeof(bitC->bitContainer) * 8); + assert(bitC->ptr <= bitC->endPtr); + MEM_writeLEST(bitC->ptr, bitC->bitContainer); + bitC->ptr += nbBytes; + bitC->bitPos &= 7; + bitC->bitContainer >>= nbBytes*8; +} + +/*! BIT_flushBits() : + * assumption : bitContainer has not overflowed + * safe version; check for buffer overflow, and prevents it. + * note : does not signal buffer overflow. + * overflow will be revealed later on using BIT_closeCStream() */ +MEM_STATIC void BIT_flushBits(BIT_CStream_t* bitC) +{ + size_t const nbBytes = bitC->bitPos >> 3; + assert(bitC->bitPos < sizeof(bitC->bitContainer) * 8); + assert(bitC->ptr <= bitC->endPtr); + MEM_writeLEST(bitC->ptr, bitC->bitContainer); + bitC->ptr += nbBytes; + if (bitC->ptr > bitC->endPtr) bitC->ptr = bitC->endPtr; + bitC->bitPos &= 7; + bitC->bitContainer >>= nbBytes*8; +} + +/*! BIT_closeCStream() : + * @return : size of CStream, in bytes, + * or 0 if it could not fit into dstBuffer */ +MEM_STATIC size_t BIT_closeCStream(BIT_CStream_t* bitC) +{ + BIT_addBitsFast(bitC, 1, 1); /* endMark */ + BIT_flushBits(bitC); + if (bitC->ptr >= bitC->endPtr) return 0; /* overflow detected */ + return (bitC->ptr - bitC->startPtr) + (bitC->bitPos > 0); +} + + +/*-******************************************************** +* bitStream decoding +**********************************************************/ +/*! BIT_initDStream() : + * Initialize a BIT_DStream_t. + * `bitD` : a pointer to an already allocated BIT_DStream_t structure. + * `srcSize` must be the *exact* size of the bitStream, in bytes. + * @return : size of stream (== srcSize), or an errorCode if a problem is detected + */ +MEM_STATIC size_t BIT_initDStream(BIT_DStream_t* bitD, const void* srcBuffer, size_t srcSize) +{ + if (srcSize < 1) { ZSTD_memset(bitD, 0, sizeof(*bitD)); return ERROR(srcSize_wrong); } + + bitD->start = (const char*)srcBuffer; + bitD->limitPtr = bitD->start + sizeof(bitD->bitContainer); + + if (srcSize >= sizeof(bitD->bitContainer)) { /* normal case */ + bitD->ptr = (const char*)srcBuffer + srcSize - sizeof(bitD->bitContainer); + bitD->bitContainer = MEM_readLEST(bitD->ptr); + { BYTE const lastByte = ((const BYTE*)srcBuffer)[srcSize-1]; + bitD->bitsConsumed = lastByte ? 8 - BIT_highbit32(lastByte) : 0; /* ensures bitsConsumed is always set */ + if (lastByte == 0) return ERROR(GENERIC); /* endMark not present */ } + } else { + bitD->ptr = bitD->start; + bitD->bitContainer = *(const BYTE*)(bitD->start); + switch(srcSize) + { + case 7: bitD->bitContainer += (size_t)(((const BYTE*)(srcBuffer))[6]) << (sizeof(bitD->bitContainer)*8 - 16); + /* fall-through */ + + case 6: bitD->bitContainer += (size_t)(((const BYTE*)(srcBuffer))[5]) << (sizeof(bitD->bitContainer)*8 - 24); + /* fall-through */ + + case 5: bitD->bitContainer += (size_t)(((const BYTE*)(srcBuffer))[4]) << (sizeof(bitD->bitContainer)*8 - 32); + /* fall-through */ + + case 4: bitD->bitContainer += (size_t)(((const BYTE*)(srcBuffer))[3]) << 24; + /* fall-through */ + + case 3: bitD->bitContainer += (size_t)(((const BYTE*)(srcBuffer))[2]) << 16; + /* fall-through */ + + case 2: bitD->bitContainer += (size_t)(((const BYTE*)(srcBuffer))[1]) << 8; + /* fall-through */ + + default: break; + } + { BYTE const lastByte = ((const BYTE*)srcBuffer)[srcSize-1]; + bitD->bitsConsumed = lastByte ? 8 - BIT_highbit32(lastByte) : 0; + if (lastByte == 0) return ERROR(corruption_detected); /* endMark not present */ + } + bitD->bitsConsumed += (U32)(sizeof(bitD->bitContainer) - srcSize)*8; + } + + return srcSize; +} + +MEM_STATIC FORCE_INLINE_ATTR size_t BIT_getUpperBits(size_t bitContainer, U32 const start) +{ + return bitContainer >> start; +} + +MEM_STATIC FORCE_INLINE_ATTR size_t BIT_getMiddleBits(size_t bitContainer, U32 const start, U32 const nbBits) +{ + U32 const regMask = sizeof(bitContainer)*8 - 1; + /* if start > regMask, bitstream is corrupted, and result is undefined */ + assert(nbBits < BIT_MASK_SIZE); + return (bitContainer >> (start & regMask)) & BIT_mask[nbBits]; +} + +MEM_STATIC FORCE_INLINE_ATTR size_t BIT_getLowerBits(size_t bitContainer, U32 const nbBits) +{ +#if defined(STATIC_BMI2) && STATIC_BMI2 == 1 + return _bzhi_u64(bitContainer, nbBits); +#else + assert(nbBits < BIT_MASK_SIZE); + return bitContainer & BIT_mask[nbBits]; +#endif +} + +/*! BIT_lookBits() : + * Provides next n bits from local register. + * local register is not modified. + * On 32-bits, maxNbBits==24. + * On 64-bits, maxNbBits==56. + * @return : value extracted */ +MEM_STATIC FORCE_INLINE_ATTR size_t BIT_lookBits(const BIT_DStream_t* bitD, U32 nbBits) +{ + /* arbitrate between double-shift and shift+mask */ +#if 1 + /* if bitD->bitsConsumed + nbBits > sizeof(bitD->bitContainer)*8, + * bitstream is likely corrupted, and result is undefined */ + return BIT_getMiddleBits(bitD->bitContainer, (sizeof(bitD->bitContainer)*8) - bitD->bitsConsumed - nbBits, nbBits); +#else + /* this code path is slower on my os-x laptop */ + U32 const regMask = sizeof(bitD->bitContainer)*8 - 1; + return ((bitD->bitContainer << (bitD->bitsConsumed & regMask)) >> 1) >> ((regMask-nbBits) & regMask); +#endif +} + +/*! BIT_lookBitsFast() : + * unsafe version; only works if nbBits >= 1 */ +MEM_STATIC size_t BIT_lookBitsFast(const BIT_DStream_t* bitD, U32 nbBits) +{ + U32 const regMask = sizeof(bitD->bitContainer)*8 - 1; + assert(nbBits >= 1); + return (bitD->bitContainer << (bitD->bitsConsumed & regMask)) >> (((regMask+1)-nbBits) & regMask); +} + +MEM_STATIC FORCE_INLINE_ATTR void BIT_skipBits(BIT_DStream_t* bitD, U32 nbBits) +{ + bitD->bitsConsumed += nbBits; +} + +/*! BIT_readBits() : + * Read (consume) next n bits from local register and update. + * Pay attention to not read more than nbBits contained into local register. + * @return : extracted value. */ +MEM_STATIC FORCE_INLINE_ATTR size_t BIT_readBits(BIT_DStream_t* bitD, unsigned nbBits) +{ + size_t const value = BIT_lookBits(bitD, nbBits); + BIT_skipBits(bitD, nbBits); + return value; +} + +/*! BIT_readBitsFast() : + * unsafe version; only works only if nbBits >= 1 */ +MEM_STATIC size_t BIT_readBitsFast(BIT_DStream_t* bitD, unsigned nbBits) +{ + size_t const value = BIT_lookBitsFast(bitD, nbBits); + assert(nbBits >= 1); + BIT_skipBits(bitD, nbBits); + return value; +} + +/*! BIT_reloadDStreamFast() : + * Similar to BIT_reloadDStream(), but with two differences: + * 1. bitsConsumed <= sizeof(bitD->bitContainer)*8 must hold! + * 2. Returns BIT_DStream_overflow when bitD->ptr < bitD->limitPtr, at this + * point you must use BIT_reloadDStream() to reload. + */ +MEM_STATIC BIT_DStream_status BIT_reloadDStreamFast(BIT_DStream_t* bitD) +{ + if (UNLIKELY(bitD->ptr < bitD->limitPtr)) + return BIT_DStream_overflow; + assert(bitD->bitsConsumed <= sizeof(bitD->bitContainer)*8); + bitD->ptr -= bitD->bitsConsumed >> 3; + bitD->bitsConsumed &= 7; + bitD->bitContainer = MEM_readLEST(bitD->ptr); + return BIT_DStream_unfinished; +} + +/*! BIT_reloadDStream() : + * Refill `bitD` from buffer previously set in BIT_initDStream() . + * This function is safe, it guarantees it will not read beyond src buffer. + * @return : status of `BIT_DStream_t` internal register. + * when status == BIT_DStream_unfinished, internal register is filled with at least 25 or 57 bits */ +MEM_STATIC BIT_DStream_status BIT_reloadDStream(BIT_DStream_t* bitD) +{ + if (bitD->bitsConsumed > (sizeof(bitD->bitContainer)*8)) /* overflow detected, like end of stream */ + return BIT_DStream_overflow; + + if (bitD->ptr >= bitD->limitPtr) { + return BIT_reloadDStreamFast(bitD); + } + if (bitD->ptr == bitD->start) { + if (bitD->bitsConsumed < sizeof(bitD->bitContainer)*8) return BIT_DStream_endOfBuffer; + return BIT_DStream_completed; + } + /* start < ptr < limitPtr */ + { U32 nbBytes = bitD->bitsConsumed >> 3; + BIT_DStream_status result = BIT_DStream_unfinished; + if (bitD->ptr - nbBytes < bitD->start) { + nbBytes = (U32)(bitD->ptr - bitD->start); /* ptr > start */ + result = BIT_DStream_endOfBuffer; + } + bitD->ptr -= nbBytes; + bitD->bitsConsumed -= nbBytes*8; + bitD->bitContainer = MEM_readLEST(bitD->ptr); /* reminder : srcSize > sizeof(bitD->bitContainer), otherwise bitD->ptr == bitD->start */ + return result; + } +} + +/*! BIT_endOfDStream() : + * @return : 1 if DStream has _exactly_ reached its end (all bits consumed). + */ +MEM_STATIC unsigned BIT_endOfDStream(const BIT_DStream_t* DStream) +{ + return ((DStream->ptr == DStream->start) && (DStream->bitsConsumed == sizeof(DStream->bitContainer)*8)); +} + +#if defined (__cplusplus) +} +#endif + +#endif /* BITSTREAM_H_MODULE */ diff --git a/external/zstd/lib/common/compiler.h b/external/zstd/lib/common/compiler.h new file mode 100644 index 00000000..a951d0ad --- /dev/null +++ b/external/zstd/lib/common/compiler.h @@ -0,0 +1,289 @@ +/* + * Copyright (c) Yann Collet, Facebook, Inc. + * All rights reserved. + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. + */ + +#ifndef ZSTD_COMPILER_H +#define ZSTD_COMPILER_H + +/*-******************************************************* +* Compiler specifics +*********************************************************/ +/* force inlining */ + +#if !defined(ZSTD_NO_INLINE) +#if (defined(__GNUC__) && !defined(__STRICT_ANSI__)) || defined(__cplusplus) || defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L /* C99 */ +# define INLINE_KEYWORD inline +#else +# define INLINE_KEYWORD +#endif + +#if defined(__GNUC__) || defined(__ICCARM__) +# define FORCE_INLINE_ATTR __attribute__((always_inline)) +#elif defined(_MSC_VER) +# define FORCE_INLINE_ATTR __forceinline +#else +# define FORCE_INLINE_ATTR +#endif + +#else + +#define INLINE_KEYWORD +#define FORCE_INLINE_ATTR + +#endif + +/** + On MSVC qsort requires that functions passed into it use the __cdecl calling conversion(CC). + This explictly marks such functions as __cdecl so that the code will still compile + if a CC other than __cdecl has been made the default. +*/ +#if defined(_MSC_VER) +# define WIN_CDECL __cdecl +#else +# define WIN_CDECL +#endif + +/** + * FORCE_INLINE_TEMPLATE is used to define C "templates", which take constant + * parameters. They must be inlined for the compiler to eliminate the constant + * branches. + */ +#define FORCE_INLINE_TEMPLATE static INLINE_KEYWORD FORCE_INLINE_ATTR +/** + * HINT_INLINE is used to help the compiler generate better code. It is *not* + * used for "templates", so it can be tweaked based on the compilers + * performance. + * + * gcc-4.8 and gcc-4.9 have been shown to benefit from leaving off the + * always_inline attribute. + * + * clang up to 5.0.0 (trunk) benefit tremendously from the always_inline + * attribute. + */ +#if !defined(__clang__) && defined(__GNUC__) && __GNUC__ >= 4 && __GNUC_MINOR__ >= 8 && __GNUC__ < 5 +# define HINT_INLINE static INLINE_KEYWORD +#else +# define HINT_INLINE static INLINE_KEYWORD FORCE_INLINE_ATTR +#endif + +/* UNUSED_ATTR tells the compiler it is okay if the function is unused. */ +#if defined(__GNUC__) +# define UNUSED_ATTR __attribute__((unused)) +#else +# define UNUSED_ATTR +#endif + +/* force no inlining */ +#ifdef _MSC_VER +# define FORCE_NOINLINE static __declspec(noinline) +#else +# if defined(__GNUC__) || defined(__ICCARM__) +# define FORCE_NOINLINE static __attribute__((__noinline__)) +# else +# define FORCE_NOINLINE static +# endif +#endif + + +/* target attribute */ +#ifndef __has_attribute + #define __has_attribute(x) 0 /* Compatibility with non-clang compilers. */ +#endif +#if defined(__GNUC__) || defined(__ICCARM__) +# define TARGET_ATTRIBUTE(target) __attribute__((__target__(target))) +#else +# define TARGET_ATTRIBUTE(target) +#endif + +/* Enable runtime BMI2 dispatch based on the CPU. + * Enabled for clang & gcc >=4.8 on x86 when BMI2 isn't enabled by default. + */ +#ifndef DYNAMIC_BMI2 + #if ((defined(__clang__) && __has_attribute(__target__)) \ + || (defined(__GNUC__) \ + && (__GNUC__ >= 5 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8)))) \ + && (defined(__x86_64__) || defined(_M_X86)) \ + && !defined(__BMI2__) + # define DYNAMIC_BMI2 1 + #else + # define DYNAMIC_BMI2 0 + #endif +#endif + +/* prefetch + * can be disabled, by declaring NO_PREFETCH build macro */ +#if defined(NO_PREFETCH) +# define PREFETCH_L1(ptr) (void)(ptr) /* disabled */ +# define PREFETCH_L2(ptr) (void)(ptr) /* disabled */ +#else +# if defined(_MSC_VER) && (defined(_M_X64) || defined(_M_I86)) /* _mm_prefetch() is not defined outside of x86/x64 */ +# include /* https://msdn.microsoft.com/fr-fr/library/84szxsww(v=vs.90).aspx */ +# define PREFETCH_L1(ptr) _mm_prefetch((const char*)(ptr), _MM_HINT_T0) +# define PREFETCH_L2(ptr) _mm_prefetch((const char*)(ptr), _MM_HINT_T1) +# elif defined(__GNUC__) && ( (__GNUC__ >= 4) || ( (__GNUC__ == 3) && (__GNUC_MINOR__ >= 1) ) ) +# define PREFETCH_L1(ptr) __builtin_prefetch((ptr), 0 /* rw==read */, 3 /* locality */) +# define PREFETCH_L2(ptr) __builtin_prefetch((ptr), 0 /* rw==read */, 2 /* locality */) +# elif defined(__aarch64__) +# define PREFETCH_L1(ptr) __asm__ __volatile__("prfm pldl1keep, %0" ::"Q"(*(ptr))) +# define PREFETCH_L2(ptr) __asm__ __volatile__("prfm pldl2keep, %0" ::"Q"(*(ptr))) +# else +# define PREFETCH_L1(ptr) (void)(ptr) /* disabled */ +# define PREFETCH_L2(ptr) (void)(ptr) /* disabled */ +# endif +#endif /* NO_PREFETCH */ + +#define CACHELINE_SIZE 64 + +#define PREFETCH_AREA(p, s) { \ + const char* const _ptr = (const char*)(p); \ + size_t const _size = (size_t)(s); \ + size_t _pos; \ + for (_pos=0; _pos<_size; _pos+=CACHELINE_SIZE) { \ + PREFETCH_L2(_ptr + _pos); \ + } \ +} + +/* vectorization + * older GCC (pre gcc-4.3 picked as the cutoff) uses a different syntax */ +#if !defined(__INTEL_COMPILER) && !defined(__clang__) && defined(__GNUC__) +# if (__GNUC__ == 4 && __GNUC_MINOR__ > 3) || (__GNUC__ >= 5) +# define DONT_VECTORIZE __attribute__((optimize("no-tree-vectorize"))) +# else +# define DONT_VECTORIZE _Pragma("GCC optimize(\"no-tree-vectorize\")") +# endif +#else +# define DONT_VECTORIZE +#endif + +/* Tell the compiler that a branch is likely or unlikely. + * Only use these macros if it causes the compiler to generate better code. + * If you can remove a LIKELY/UNLIKELY annotation without speed changes in gcc + * and clang, please do. + */ +#if defined(__GNUC__) +#define LIKELY(x) (__builtin_expect((x), 1)) +#define UNLIKELY(x) (__builtin_expect((x), 0)) +#else +#define LIKELY(x) (x) +#define UNLIKELY(x) (x) +#endif + +/* disable warnings */ +#ifdef _MSC_VER /* Visual Studio */ +# include /* For Visual 2005 */ +# pragma warning(disable : 4100) /* disable: C4100: unreferenced formal parameter */ +# pragma warning(disable : 4127) /* disable: C4127: conditional expression is constant */ +# pragma warning(disable : 4204) /* disable: C4204: non-constant aggregate initializer */ +# pragma warning(disable : 4214) /* disable: C4214: non-int bitfields */ +# pragma warning(disable : 4324) /* disable: C4324: padded structure */ +#endif + +/*Like DYNAMIC_BMI2 but for compile time determination of BMI2 support*/ +#ifndef STATIC_BMI2 +# if defined(_MSC_VER) && (defined(_M_X64) || defined(_M_I86)) +# ifdef __AVX2__ //MSVC does not have a BMI2 specific flag, but every CPU that supports AVX2 also supports BMI2 +# define STATIC_BMI2 1 +# endif +# endif +#endif + +#ifndef STATIC_BMI2 + #define STATIC_BMI2 0 +#endif + +/* compat. with non-clang compilers */ +#ifndef __has_builtin +# define __has_builtin(x) 0 +#endif + +/* compat. with non-clang compilers */ +#ifndef __has_feature +# define __has_feature(x) 0 +#endif + +/* detects whether we are being compiled under msan */ +#ifndef ZSTD_MEMORY_SANITIZER +# if __has_feature(memory_sanitizer) +# define ZSTD_MEMORY_SANITIZER 1 +# else +# define ZSTD_MEMORY_SANITIZER 0 +# endif +#endif + +#if ZSTD_MEMORY_SANITIZER +/* Not all platforms that support msan provide sanitizers/msan_interface.h. + * We therefore declare the functions we need ourselves, rather than trying to + * include the header file... */ +#include /* size_t */ +#define ZSTD_DEPS_NEED_STDINT +#include "zstd_deps.h" /* intptr_t */ + +/* Make memory region fully initialized (without changing its contents). */ +void __msan_unpoison(const volatile void *a, size_t size); + +/* Make memory region fully uninitialized (without changing its contents). + This is a legacy interface that does not update origin information. Use + __msan_allocated_memory() instead. */ +void __msan_poison(const volatile void *a, size_t size); + +/* Returns the offset of the first (at least partially) poisoned byte in the + memory range, or -1 if the whole range is good. */ +intptr_t __msan_test_shadow(const volatile void *x, size_t size); +#endif + +/* detects whether we are being compiled under asan */ +#ifndef ZSTD_ADDRESS_SANITIZER +# if __has_feature(address_sanitizer) +# define ZSTD_ADDRESS_SANITIZER 1 +# elif defined(__SANITIZE_ADDRESS__) +# define ZSTD_ADDRESS_SANITIZER 1 +# else +# define ZSTD_ADDRESS_SANITIZER 0 +# endif +#endif + +#if ZSTD_ADDRESS_SANITIZER +/* Not all platforms that support asan provide sanitizers/asan_interface.h. + * We therefore declare the functions we need ourselves, rather than trying to + * include the header file... */ +#include /* size_t */ + +/** + * Marks a memory region ([addr, addr+size)) as unaddressable. + * + * This memory must be previously allocated by your program. Instrumented + * code is forbidden from accessing addresses in this region until it is + * unpoisoned. This function is not guaranteed to poison the entire region - + * it could poison only a subregion of [addr, addr+size) due to ASan + * alignment restrictions. + * + * \note This function is not thread-safe because no two threads can poison or + * unpoison memory in the same memory region simultaneously. + * + * \param addr Start of memory region. + * \param size Size of memory region. */ +void __asan_poison_memory_region(void const volatile *addr, size_t size); + +/** + * Marks a memory region ([addr, addr+size)) as addressable. + * + * This memory must be previously allocated by your program. Accessing + * addresses in this region is allowed until this region is poisoned again. + * This function could unpoison a super-region of [addr, addr+size) due + * to ASan alignment restrictions. + * + * \note This function is not thread-safe because no two threads can + * poison or unpoison memory in the same memory region simultaneously. + * + * \param addr Start of memory region. + * \param size Size of memory region. */ +void __asan_unpoison_memory_region(void const volatile *addr, size_t size); +#endif + +#endif /* ZSTD_COMPILER_H */ diff --git a/external/zstd/lib/common/cpu.h b/external/zstd/lib/common/cpu.h new file mode 100644 index 00000000..8acd33be --- /dev/null +++ b/external/zstd/lib/common/cpu.h @@ -0,0 +1,213 @@ +/* + * Copyright (c) Facebook, Inc. + * All rights reserved. + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. + */ + +#ifndef ZSTD_COMMON_CPU_H +#define ZSTD_COMMON_CPU_H + +/** + * Implementation taken from folly/CpuId.h + * https://github.com/facebook/folly/blob/master/folly/CpuId.h + */ + +#include "mem.h" + +#ifdef _MSC_VER +#include +#endif + +typedef struct { + U32 f1c; + U32 f1d; + U32 f7b; + U32 f7c; +} ZSTD_cpuid_t; + +MEM_STATIC ZSTD_cpuid_t ZSTD_cpuid(void) { + U32 f1c = 0; + U32 f1d = 0; + U32 f7b = 0; + U32 f7c = 0; +#if defined(_MSC_VER) && (defined(_M_X64) || defined(_M_IX86)) + int reg[4]; + __cpuid((int*)reg, 0); + { + int const n = reg[0]; + if (n >= 1) { + __cpuid((int*)reg, 1); + f1c = (U32)reg[2]; + f1d = (U32)reg[3]; + } + if (n >= 7) { + __cpuidex((int*)reg, 7, 0); + f7b = (U32)reg[1]; + f7c = (U32)reg[2]; + } + } +#elif defined(__i386__) && defined(__PIC__) && !defined(__clang__) && defined(__GNUC__) + /* The following block like the normal cpuid branch below, but gcc + * reserves ebx for use of its pic register so we must specially + * handle the save and restore to avoid clobbering the register + */ + U32 n; + __asm__( + "pushl %%ebx\n\t" + "cpuid\n\t" + "popl %%ebx\n\t" + : "=a"(n) + : "a"(0) + : "ecx", "edx"); + if (n >= 1) { + U32 f1a; + __asm__( + "pushl %%ebx\n\t" + "cpuid\n\t" + "popl %%ebx\n\t" + : "=a"(f1a), "=c"(f1c), "=d"(f1d) + : "a"(1)); + } + if (n >= 7) { + __asm__( + "pushl %%ebx\n\t" + "cpuid\n\t" + "movl %%ebx, %%eax\n\t" + "popl %%ebx" + : "=a"(f7b), "=c"(f7c) + : "a"(7), "c"(0) + : "edx"); + } +#elif defined(__x86_64__) || defined(_M_X64) || defined(__i386__) + U32 n; + __asm__("cpuid" : "=a"(n) : "a"(0) : "ebx", "ecx", "edx"); + if (n >= 1) { + U32 f1a; + __asm__("cpuid" : "=a"(f1a), "=c"(f1c), "=d"(f1d) : "a"(1) : "ebx"); + } + if (n >= 7) { + U32 f7a; + __asm__("cpuid" + : "=a"(f7a), "=b"(f7b), "=c"(f7c) + : "a"(7), "c"(0) + : "edx"); + } +#endif + { + ZSTD_cpuid_t cpuid; + cpuid.f1c = f1c; + cpuid.f1d = f1d; + cpuid.f7b = f7b; + cpuid.f7c = f7c; + return cpuid; + } +} + +#define X(name, r, bit) \ + MEM_STATIC int ZSTD_cpuid_##name(ZSTD_cpuid_t const cpuid) { \ + return ((cpuid.r) & (1U << bit)) != 0; \ + } + +/* cpuid(1): Processor Info and Feature Bits. */ +#define C(name, bit) X(name, f1c, bit) + C(sse3, 0) + C(pclmuldq, 1) + C(dtes64, 2) + C(monitor, 3) + C(dscpl, 4) + C(vmx, 5) + C(smx, 6) + C(eist, 7) + C(tm2, 8) + C(ssse3, 9) + C(cnxtid, 10) + C(fma, 12) + C(cx16, 13) + C(xtpr, 14) + C(pdcm, 15) + C(pcid, 17) + C(dca, 18) + C(sse41, 19) + C(sse42, 20) + C(x2apic, 21) + C(movbe, 22) + C(popcnt, 23) + C(tscdeadline, 24) + C(aes, 25) + C(xsave, 26) + C(osxsave, 27) + C(avx, 28) + C(f16c, 29) + C(rdrand, 30) +#undef C +#define D(name, bit) X(name, f1d, bit) + D(fpu, 0) + D(vme, 1) + D(de, 2) + D(pse, 3) + D(tsc, 4) + D(msr, 5) + D(pae, 6) + D(mce, 7) + D(cx8, 8) + D(apic, 9) + D(sep, 11) + D(mtrr, 12) + D(pge, 13) + D(mca, 14) + D(cmov, 15) + D(pat, 16) + D(pse36, 17) + D(psn, 18) + D(clfsh, 19) + D(ds, 21) + D(acpi, 22) + D(mmx, 23) + D(fxsr, 24) + D(sse, 25) + D(sse2, 26) + D(ss, 27) + D(htt, 28) + D(tm, 29) + D(pbe, 31) +#undef D + +/* cpuid(7): Extended Features. */ +#define B(name, bit) X(name, f7b, bit) + B(bmi1, 3) + B(hle, 4) + B(avx2, 5) + B(smep, 7) + B(bmi2, 8) + B(erms, 9) + B(invpcid, 10) + B(rtm, 11) + B(mpx, 14) + B(avx512f, 16) + B(avx512dq, 17) + B(rdseed, 18) + B(adx, 19) + B(smap, 20) + B(avx512ifma, 21) + B(pcommit, 22) + B(clflushopt, 23) + B(clwb, 24) + B(avx512pf, 26) + B(avx512er, 27) + B(avx512cd, 28) + B(sha, 29) + B(avx512bw, 30) + B(avx512vl, 31) +#undef B +#define C(name, bit) X(name, f7c, bit) + C(prefetchwt1, 0) + C(avx512vbmi, 1) +#undef C + +#undef X + +#endif /* ZSTD_COMMON_CPU_H */ diff --git a/external/zstd/lib/common/debug.c b/external/zstd/lib/common/debug.c new file mode 100644 index 00000000..bb863c9e --- /dev/null +++ b/external/zstd/lib/common/debug.c @@ -0,0 +1,24 @@ +/* ****************************************************************** + * debug + * Part of FSE library + * Copyright (c) Yann Collet, Facebook, Inc. + * + * You can contact the author at : + * - Source repository : https://github.com/Cyan4973/FiniteStateEntropy + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. +****************************************************************** */ + + +/* + * This module only hosts one global variable + * which can be used to dynamically influence the verbosity of traces, + * such as DEBUGLOG and RAWLOG + */ + +#include "debug.h" + +int g_debuglevel = DEBUGLEVEL; diff --git a/external/zstd/lib/common/debug.h b/external/zstd/lib/common/debug.h new file mode 100644 index 00000000..3b2a320a --- /dev/null +++ b/external/zstd/lib/common/debug.h @@ -0,0 +1,107 @@ +/* ****************************************************************** + * debug + * Part of FSE library + * Copyright (c) Yann Collet, Facebook, Inc. + * + * You can contact the author at : + * - Source repository : https://github.com/Cyan4973/FiniteStateEntropy + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. +****************************************************************** */ + + +/* + * The purpose of this header is to enable debug functions. + * They regroup assert(), DEBUGLOG() and RAWLOG() for run-time, + * and DEBUG_STATIC_ASSERT() for compile-time. + * + * By default, DEBUGLEVEL==0, which means run-time debug is disabled. + * + * Level 1 enables assert() only. + * Starting level 2, traces can be generated and pushed to stderr. + * The higher the level, the more verbose the traces. + * + * It's possible to dynamically adjust level using variable g_debug_level, + * which is only declared if DEBUGLEVEL>=2, + * and is a global variable, not multi-thread protected (use with care) + */ + +#ifndef DEBUG_H_12987983217 +#define DEBUG_H_12987983217 + +#if defined (__cplusplus) +extern "C" { +#endif + + +/* static assert is triggered at compile time, leaving no runtime artefact. + * static assert only works with compile-time constants. + * Also, this variant can only be used inside a function. */ +#define DEBUG_STATIC_ASSERT(c) (void)sizeof(char[(c) ? 1 : -1]) + + +/* DEBUGLEVEL is expected to be defined externally, + * typically through compiler command line. + * Value must be a number. */ +#ifndef DEBUGLEVEL +# define DEBUGLEVEL 0 +#endif + + +/* recommended values for DEBUGLEVEL : + * 0 : release mode, no debug, all run-time checks disabled + * 1 : enables assert() only, no display + * 2 : reserved, for currently active debug path + * 3 : events once per object lifetime (CCtx, CDict, etc.) + * 4 : events once per frame + * 5 : events once per block + * 6 : events once per sequence (verbose) + * 7+: events at every position (*very* verbose) + * + * It's generally inconvenient to output traces > 5. + * In which case, it's possible to selectively trigger high verbosity levels + * by modifying g_debug_level. + */ + +#if (DEBUGLEVEL>=1) +# define ZSTD_DEPS_NEED_ASSERT +# include "zstd_deps.h" +#else +# ifndef assert /* assert may be already defined, due to prior #include */ +# define assert(condition) ((void)0) /* disable assert (default) */ +# endif +#endif + +#if (DEBUGLEVEL>=2) +# define ZSTD_DEPS_NEED_IO +# include "zstd_deps.h" +extern int g_debuglevel; /* the variable is only declared, + it actually lives in debug.c, + and is shared by the whole process. + It's not thread-safe. + It's useful when enabling very verbose levels + on selective conditions (such as position in src) */ + +# define RAWLOG(l, ...) { \ + if (l<=g_debuglevel) { \ + ZSTD_DEBUG_PRINT(__VA_ARGS__); \ + } } +# define DEBUGLOG(l, ...) { \ + if (l<=g_debuglevel) { \ + ZSTD_DEBUG_PRINT(__FILE__ ": " __VA_ARGS__); \ + ZSTD_DEBUG_PRINT(" \n"); \ + } } +#else +# define RAWLOG(l, ...) {} /* disabled */ +# define DEBUGLOG(l, ...) {} /* disabled */ +#endif + + +#if defined (__cplusplus) +} +#endif + +#endif /* DEBUG_H_12987983217 */ diff --git a/external/zstd/lib/common/entropy_common.c b/external/zstd/lib/common/entropy_common.c new file mode 100644 index 00000000..41cd6956 --- /dev/null +++ b/external/zstd/lib/common/entropy_common.c @@ -0,0 +1,362 @@ +/* ****************************************************************** + * Common functions of New Generation Entropy library + * Copyright (c) Yann Collet, Facebook, Inc. + * + * You can contact the author at : + * - FSE+HUF source repository : https://github.com/Cyan4973/FiniteStateEntropy + * - Public forum : https://groups.google.com/forum/#!forum/lz4c + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. +****************************************************************** */ + +/* ************************************* +* Dependencies +***************************************/ +#include "mem.h" +#include "error_private.h" /* ERR_*, ERROR */ +#define FSE_STATIC_LINKING_ONLY /* FSE_MIN_TABLELOG */ +#include "fse.h" +#define HUF_STATIC_LINKING_ONLY /* HUF_TABLELOG_ABSOLUTEMAX */ +#include "huf.h" + + +/*=== Version ===*/ +unsigned FSE_versionNumber(void) { return FSE_VERSION_NUMBER; } + + +/*=== Error Management ===*/ +unsigned FSE_isError(size_t code) { return ERR_isError(code); } +const char* FSE_getErrorName(size_t code) { return ERR_getErrorName(code); } + +unsigned HUF_isError(size_t code) { return ERR_isError(code); } +const char* HUF_getErrorName(size_t code) { return ERR_getErrorName(code); } + + +/*-************************************************************** +* FSE NCount encoding-decoding +****************************************************************/ +static U32 FSE_ctz(U32 val) +{ + assert(val != 0); + { +# if defined(_MSC_VER) /* Visual */ + unsigned long r=0; + return _BitScanForward(&r, val) ? (unsigned)r : 0; +# elif defined(__GNUC__) && (__GNUC__ >= 3) /* GCC Intrinsic */ + return __builtin_ctz(val); +# elif defined(__ICCARM__) /* IAR Intrinsic */ + return __CTZ(val); +# else /* Software version */ + U32 count = 0; + while ((val & 1) == 0) { + val >>= 1; + ++count; + } + return count; +# endif + } +} + +FORCE_INLINE_TEMPLATE +size_t FSE_readNCount_body(short* normalizedCounter, unsigned* maxSVPtr, unsigned* tableLogPtr, + const void* headerBuffer, size_t hbSize) +{ + const BYTE* const istart = (const BYTE*) headerBuffer; + const BYTE* const iend = istart + hbSize; + const BYTE* ip = istart; + int nbBits; + int remaining; + int threshold; + U32 bitStream; + int bitCount; + unsigned charnum = 0; + unsigned const maxSV1 = *maxSVPtr + 1; + int previous0 = 0; + + if (hbSize < 8) { + /* This function only works when hbSize >= 8 */ + char buffer[8] = {0}; + ZSTD_memcpy(buffer, headerBuffer, hbSize); + { size_t const countSize = FSE_readNCount(normalizedCounter, maxSVPtr, tableLogPtr, + buffer, sizeof(buffer)); + if (FSE_isError(countSize)) return countSize; + if (countSize > hbSize) return ERROR(corruption_detected); + return countSize; + } } + assert(hbSize >= 8); + + /* init */ + ZSTD_memset(normalizedCounter, 0, (*maxSVPtr+1) * sizeof(normalizedCounter[0])); /* all symbols not present in NCount have a frequency of 0 */ + bitStream = MEM_readLE32(ip); + nbBits = (bitStream & 0xF) + FSE_MIN_TABLELOG; /* extract tableLog */ + if (nbBits > FSE_TABLELOG_ABSOLUTE_MAX) return ERROR(tableLog_tooLarge); + bitStream >>= 4; + bitCount = 4; + *tableLogPtr = nbBits; + remaining = (1<> 1; + while (repeats >= 12) { + charnum += 3 * 12; + if (LIKELY(ip <= iend-7)) { + ip += 3; + } else { + bitCount -= (int)(8 * (iend - 7 - ip)); + bitCount &= 31; + ip = iend - 4; + } + bitStream = MEM_readLE32(ip) >> bitCount; + repeats = FSE_ctz(~bitStream | 0x80000000) >> 1; + } + charnum += 3 * repeats; + bitStream >>= 2 * repeats; + bitCount += 2 * repeats; + + /* Add the final repeat which isn't 0b11. */ + assert((bitStream & 3) < 3); + charnum += bitStream & 3; + bitCount += 2; + + /* This is an error, but break and return an error + * at the end, because returning out of a loop makes + * it harder for the compiler to optimize. + */ + if (charnum >= maxSV1) break; + + /* We don't need to set the normalized count to 0 + * because we already memset the whole buffer to 0. + */ + + if (LIKELY(ip <= iend-7) || (ip + (bitCount>>3) <= iend-4)) { + assert((bitCount >> 3) <= 3); /* For first condition to work */ + ip += bitCount>>3; + bitCount &= 7; + } else { + bitCount -= (int)(8 * (iend - 4 - ip)); + bitCount &= 31; + ip = iend - 4; + } + bitStream = MEM_readLE32(ip) >> bitCount; + } + { + int const max = (2*threshold-1) - remaining; + int count; + + if ((bitStream & (threshold-1)) < (U32)max) { + count = bitStream & (threshold-1); + bitCount += nbBits-1; + } else { + count = bitStream & (2*threshold-1); + if (count >= threshold) count -= max; + bitCount += nbBits; + } + + count--; /* extra accuracy */ + /* When it matters (small blocks), this is a + * predictable branch, because we don't use -1. + */ + if (count >= 0) { + remaining -= count; + } else { + assert(count == -1); + remaining += count; + } + normalizedCounter[charnum++] = (short)count; + previous0 = !count; + + assert(threshold > 1); + if (remaining < threshold) { + /* This branch can be folded into the + * threshold update condition because we + * know that threshold > 1. + */ + if (remaining <= 1) break; + nbBits = BIT_highbit32(remaining) + 1; + threshold = 1 << (nbBits - 1); + } + if (charnum >= maxSV1) break; + + if (LIKELY(ip <= iend-7) || (ip + (bitCount>>3) <= iend-4)) { + ip += bitCount>>3; + bitCount &= 7; + } else { + bitCount -= (int)(8 * (iend - 4 - ip)); + bitCount &= 31; + ip = iend - 4; + } + bitStream = MEM_readLE32(ip) >> bitCount; + } } + if (remaining != 1) return ERROR(corruption_detected); + /* Only possible when there are too many zeros. */ + if (charnum > maxSV1) return ERROR(maxSymbolValue_tooSmall); + if (bitCount > 32) return ERROR(corruption_detected); + *maxSVPtr = charnum-1; + + ip += (bitCount+7)>>3; + return ip-istart; +} + +/* Avoids the FORCE_INLINE of the _body() function. */ +static size_t FSE_readNCount_body_default( + short* normalizedCounter, unsigned* maxSVPtr, unsigned* tableLogPtr, + const void* headerBuffer, size_t hbSize) +{ + return FSE_readNCount_body(normalizedCounter, maxSVPtr, tableLogPtr, headerBuffer, hbSize); +} + +#if DYNAMIC_BMI2 +TARGET_ATTRIBUTE("bmi2") static size_t FSE_readNCount_body_bmi2( + short* normalizedCounter, unsigned* maxSVPtr, unsigned* tableLogPtr, + const void* headerBuffer, size_t hbSize) +{ + return FSE_readNCount_body(normalizedCounter, maxSVPtr, tableLogPtr, headerBuffer, hbSize); +} +#endif + +size_t FSE_readNCount_bmi2( + short* normalizedCounter, unsigned* maxSVPtr, unsigned* tableLogPtr, + const void* headerBuffer, size_t hbSize, int bmi2) +{ +#if DYNAMIC_BMI2 + if (bmi2) { + return FSE_readNCount_body_bmi2(normalizedCounter, maxSVPtr, tableLogPtr, headerBuffer, hbSize); + } +#endif + (void)bmi2; + return FSE_readNCount_body_default(normalizedCounter, maxSVPtr, tableLogPtr, headerBuffer, hbSize); +} + +size_t FSE_readNCount( + short* normalizedCounter, unsigned* maxSVPtr, unsigned* tableLogPtr, + const void* headerBuffer, size_t hbSize) +{ + return FSE_readNCount_bmi2(normalizedCounter, maxSVPtr, tableLogPtr, headerBuffer, hbSize, /* bmi2 */ 0); +} + + +/*! HUF_readStats() : + Read compact Huffman tree, saved by HUF_writeCTable(). + `huffWeight` is destination buffer. + `rankStats` is assumed to be a table of at least HUF_TABLELOG_MAX U32. + @return : size read from `src` , or an error Code . + Note : Needed by HUF_readCTable() and HUF_readDTableX?() . +*/ +size_t HUF_readStats(BYTE* huffWeight, size_t hwSize, U32* rankStats, + U32* nbSymbolsPtr, U32* tableLogPtr, + const void* src, size_t srcSize) +{ + U32 wksp[HUF_READ_STATS_WORKSPACE_SIZE_U32]; + return HUF_readStats_wksp(huffWeight, hwSize, rankStats, nbSymbolsPtr, tableLogPtr, src, srcSize, wksp, sizeof(wksp), /* bmi2 */ 0); +} + +FORCE_INLINE_TEMPLATE size_t +HUF_readStats_body(BYTE* huffWeight, size_t hwSize, U32* rankStats, + U32* nbSymbolsPtr, U32* tableLogPtr, + const void* src, size_t srcSize, + void* workSpace, size_t wkspSize, + int bmi2) +{ + U32 weightTotal; + const BYTE* ip = (const BYTE*) src; + size_t iSize; + size_t oSize; + + if (!srcSize) return ERROR(srcSize_wrong); + iSize = ip[0]; + /* ZSTD_memset(huffWeight, 0, hwSize); *//* is not necessary, even though some analyzer complain ... */ + + if (iSize >= 128) { /* special header */ + oSize = iSize - 127; + iSize = ((oSize+1)/2); + if (iSize+1 > srcSize) return ERROR(srcSize_wrong); + if (oSize >= hwSize) return ERROR(corruption_detected); + ip += 1; + { U32 n; + for (n=0; n> 4; + huffWeight[n+1] = ip[n/2] & 15; + } } } + else { /* header compressed with FSE (normal case) */ + if (iSize+1 > srcSize) return ERROR(srcSize_wrong); + /* max (hwSize-1) values decoded, as last one is implied */ + oSize = FSE_decompress_wksp_bmi2(huffWeight, hwSize-1, ip+1, iSize, 6, workSpace, wkspSize, bmi2); + if (FSE_isError(oSize)) return oSize; + } + + /* collect weight stats */ + ZSTD_memset(rankStats, 0, (HUF_TABLELOG_MAX + 1) * sizeof(U32)); + weightTotal = 0; + { U32 n; for (n=0; n= HUF_TABLELOG_MAX) return ERROR(corruption_detected); + rankStats[huffWeight[n]]++; + weightTotal += (1 << huffWeight[n]) >> 1; + } } + if (weightTotal == 0) return ERROR(corruption_detected); + + /* get last non-null symbol weight (implied, total must be 2^n) */ + { U32 const tableLog = BIT_highbit32(weightTotal) + 1; + if (tableLog > HUF_TABLELOG_MAX) return ERROR(corruption_detected); + *tableLogPtr = tableLog; + /* determine last weight */ + { U32 const total = 1 << tableLog; + U32 const rest = total - weightTotal; + U32 const verif = 1 << BIT_highbit32(rest); + U32 const lastWeight = BIT_highbit32(rest) + 1; + if (verif != rest) return ERROR(corruption_detected); /* last value must be a clean power of 2 */ + huffWeight[oSize] = (BYTE)lastWeight; + rankStats[lastWeight]++; + } } + + /* check tree construction validity */ + if ((rankStats[1] < 2) || (rankStats[1] & 1)) return ERROR(corruption_detected); /* by construction : at least 2 elts of rank 1, must be even */ + + /* results */ + *nbSymbolsPtr = (U32)(oSize+1); + return iSize+1; +} + +/* Avoids the FORCE_INLINE of the _body() function. */ +static size_t HUF_readStats_body_default(BYTE* huffWeight, size_t hwSize, U32* rankStats, + U32* nbSymbolsPtr, U32* tableLogPtr, + const void* src, size_t srcSize, + void* workSpace, size_t wkspSize) +{ + return HUF_readStats_body(huffWeight, hwSize, rankStats, nbSymbolsPtr, tableLogPtr, src, srcSize, workSpace, wkspSize, 0); +} + +#if DYNAMIC_BMI2 +static TARGET_ATTRIBUTE("bmi2") size_t HUF_readStats_body_bmi2(BYTE* huffWeight, size_t hwSize, U32* rankStats, + U32* nbSymbolsPtr, U32* tableLogPtr, + const void* src, size_t srcSize, + void* workSpace, size_t wkspSize) +{ + return HUF_readStats_body(huffWeight, hwSize, rankStats, nbSymbolsPtr, tableLogPtr, src, srcSize, workSpace, wkspSize, 1); +} +#endif + +size_t HUF_readStats_wksp(BYTE* huffWeight, size_t hwSize, U32* rankStats, + U32* nbSymbolsPtr, U32* tableLogPtr, + const void* src, size_t srcSize, + void* workSpace, size_t wkspSize, + int bmi2) +{ +#if DYNAMIC_BMI2 + if (bmi2) { + return HUF_readStats_body_bmi2(huffWeight, hwSize, rankStats, nbSymbolsPtr, tableLogPtr, src, srcSize, workSpace, wkspSize); + } +#endif + (void)bmi2; + return HUF_readStats_body_default(huffWeight, hwSize, rankStats, nbSymbolsPtr, tableLogPtr, src, srcSize, workSpace, wkspSize); +} diff --git a/external/zstd/lib/common/error_private.c b/external/zstd/lib/common/error_private.c new file mode 100644 index 00000000..6d1135f8 --- /dev/null +++ b/external/zstd/lib/common/error_private.c @@ -0,0 +1,56 @@ +/* + * Copyright (c) Yann Collet, Facebook, Inc. + * All rights reserved. + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. + */ + +/* The purpose of this file is to have a single list of error strings embedded in binary */ + +#include "error_private.h" + +const char* ERR_getErrorString(ERR_enum code) +{ +#ifdef ZSTD_STRIP_ERROR_STRINGS + (void)code; + return "Error strings stripped"; +#else + static const char* const notErrorCode = "Unspecified error code"; + switch( code ) + { + case PREFIX(no_error): return "No error detected"; + case PREFIX(GENERIC): return "Error (generic)"; + case PREFIX(prefix_unknown): return "Unknown frame descriptor"; + case PREFIX(version_unsupported): return "Version not supported"; + case PREFIX(frameParameter_unsupported): return "Unsupported frame parameter"; + case PREFIX(frameParameter_windowTooLarge): return "Frame requires too much memory for decoding"; + case PREFIX(corruption_detected): return "Corrupted block detected"; + case PREFIX(checksum_wrong): return "Restored data doesn't match checksum"; + case PREFIX(parameter_unsupported): return "Unsupported parameter"; + case PREFIX(parameter_outOfBound): return "Parameter is out of bound"; + case PREFIX(init_missing): return "Context should be init first"; + case PREFIX(memory_allocation): return "Allocation error : not enough memory"; + case PREFIX(workSpace_tooSmall): return "workSpace buffer is not large enough"; + case PREFIX(stage_wrong): return "Operation not authorized at current processing stage"; + case PREFIX(tableLog_tooLarge): return "tableLog requires too much memory : unsupported"; + case PREFIX(maxSymbolValue_tooLarge): return "Unsupported max Symbol Value : too large"; + case PREFIX(maxSymbolValue_tooSmall): return "Specified maxSymbolValue is too small"; + case PREFIX(dictionary_corrupted): return "Dictionary is corrupted"; + case PREFIX(dictionary_wrong): return "Dictionary mismatch"; + case PREFIX(dictionaryCreation_failed): return "Cannot create Dictionary from provided samples"; + case PREFIX(dstSize_tooSmall): return "Destination buffer is too small"; + case PREFIX(srcSize_wrong): return "Src size is incorrect"; + case PREFIX(dstBuffer_null): return "Operation on NULL destination buffer"; + /* following error codes are not stable and may be removed or changed in a future version */ + case PREFIX(frameIndex_tooLarge): return "Frame index is too large"; + case PREFIX(seekableIO): return "An I/O error occurred when reading/seeking"; + case PREFIX(dstBuffer_wrong): return "Destination buffer is wrong"; + case PREFIX(srcBuffer_wrong): return "Source buffer is wrong"; + case PREFIX(maxCode): + default: return notErrorCode; + } +#endif +} diff --git a/external/zstd/lib/common/error_private.h b/external/zstd/lib/common/error_private.h new file mode 100644 index 00000000..6d8b9f77 --- /dev/null +++ b/external/zstd/lib/common/error_private.h @@ -0,0 +1,80 @@ +/* + * Copyright (c) Yann Collet, Facebook, Inc. + * All rights reserved. + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. + */ + +/* Note : this module is expected to remain private, do not expose it */ + +#ifndef ERROR_H_MODULE +#define ERROR_H_MODULE + +#if defined (__cplusplus) +extern "C" { +#endif + + +/* **************************************** +* Dependencies +******************************************/ +#include "../zstd_errors.h" /* enum list */ +#include "zstd_deps.h" /* size_t */ + + +/* **************************************** +* Compiler-specific +******************************************/ +#if defined(__GNUC__) +# define ERR_STATIC static __attribute__((unused)) +#elif defined (__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */) +# define ERR_STATIC static inline +#elif defined(_MSC_VER) +# define ERR_STATIC static __inline +#else +# define ERR_STATIC static /* this version may generate warnings for unused static functions; disable the relevant warning */ +#endif + + +/*-**************************************** +* Customization (error_public.h) +******************************************/ +typedef ZSTD_ErrorCode ERR_enum; +#define PREFIX(name) ZSTD_error_##name + + +/*-**************************************** +* Error codes handling +******************************************/ +#undef ERROR /* already defined on Visual Studio */ +#define ERROR(name) ZSTD_ERROR(name) +#define ZSTD_ERROR(name) ((size_t)-PREFIX(name)) + +ERR_STATIC unsigned ERR_isError(size_t code) { return (code > ERROR(maxCode)); } + +ERR_STATIC ERR_enum ERR_getErrorCode(size_t code) { if (!ERR_isError(code)) return (ERR_enum)0; return (ERR_enum) (0-code); } + +/* check and forward error code */ +#define CHECK_V_F(e, f) size_t const e = f; if (ERR_isError(e)) return e +#define CHECK_F(f) { CHECK_V_F(_var_err__, f); } + + +/*-**************************************** +* Error Strings +******************************************/ + +const char* ERR_getErrorString(ERR_enum code); /* error_private.c */ + +ERR_STATIC const char* ERR_getErrorName(size_t code) +{ + return ERR_getErrorString(ERR_getErrorCode(code)); +} + +#if defined (__cplusplus) +} +#endif + +#endif /* ERROR_H_MODULE */ diff --git a/external/zstd/lib/common/fse.h b/external/zstd/lib/common/fse.h new file mode 100644 index 00000000..19dd4feb --- /dev/null +++ b/external/zstd/lib/common/fse.h @@ -0,0 +1,716 @@ +/* ****************************************************************** + * FSE : Finite State Entropy codec + * Public Prototypes declaration + * Copyright (c) Yann Collet, Facebook, Inc. + * + * You can contact the author at : + * - Source repository : https://github.com/Cyan4973/FiniteStateEntropy + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. +****************************************************************** */ + +#if defined (__cplusplus) +extern "C" { +#endif + +#ifndef FSE_H +#define FSE_H + + +/*-***************************************** +* Dependencies +******************************************/ +#include "zstd_deps.h" /* size_t, ptrdiff_t */ + + +/*-***************************************** +* FSE_PUBLIC_API : control library symbols visibility +******************************************/ +#if defined(FSE_DLL_EXPORT) && (FSE_DLL_EXPORT==1) && defined(__GNUC__) && (__GNUC__ >= 4) +# define FSE_PUBLIC_API __attribute__ ((visibility ("default"))) +#elif defined(FSE_DLL_EXPORT) && (FSE_DLL_EXPORT==1) /* Visual expected */ +# define FSE_PUBLIC_API __declspec(dllexport) +#elif defined(FSE_DLL_IMPORT) && (FSE_DLL_IMPORT==1) +# define FSE_PUBLIC_API __declspec(dllimport) /* It isn't required but allows to generate better code, saving a function pointer load from the IAT and an indirect jump.*/ +#else +# define FSE_PUBLIC_API +#endif + +/*------ Version ------*/ +#define FSE_VERSION_MAJOR 0 +#define FSE_VERSION_MINOR 9 +#define FSE_VERSION_RELEASE 0 + +#define FSE_LIB_VERSION FSE_VERSION_MAJOR.FSE_VERSION_MINOR.FSE_VERSION_RELEASE +#define FSE_QUOTE(str) #str +#define FSE_EXPAND_AND_QUOTE(str) FSE_QUOTE(str) +#define FSE_VERSION_STRING FSE_EXPAND_AND_QUOTE(FSE_LIB_VERSION) + +#define FSE_VERSION_NUMBER (FSE_VERSION_MAJOR *100*100 + FSE_VERSION_MINOR *100 + FSE_VERSION_RELEASE) +FSE_PUBLIC_API unsigned FSE_versionNumber(void); /**< library version number; to be used when checking dll version */ + + +/*-**************************************** +* FSE simple functions +******************************************/ +/*! FSE_compress() : + Compress content of buffer 'src', of size 'srcSize', into destination buffer 'dst'. + 'dst' buffer must be already allocated. Compression runs faster is dstCapacity >= FSE_compressBound(srcSize). + @return : size of compressed data (<= dstCapacity). + Special values : if return == 0, srcData is not compressible => Nothing is stored within dst !!! + if return == 1, srcData is a single byte symbol * srcSize times. Use RLE compression instead. + if FSE_isError(return), compression failed (more details using FSE_getErrorName()) +*/ +FSE_PUBLIC_API size_t FSE_compress(void* dst, size_t dstCapacity, + const void* src, size_t srcSize); + +/*! FSE_decompress(): + Decompress FSE data from buffer 'cSrc', of size 'cSrcSize', + into already allocated destination buffer 'dst', of size 'dstCapacity'. + @return : size of regenerated data (<= maxDstSize), + or an error code, which can be tested using FSE_isError() . + + ** Important ** : FSE_decompress() does not decompress non-compressible nor RLE data !!! + Why ? : making this distinction requires a header. + Header management is intentionally delegated to the user layer, which can better manage special cases. +*/ +FSE_PUBLIC_API size_t FSE_decompress(void* dst, size_t dstCapacity, + const void* cSrc, size_t cSrcSize); + + +/*-***************************************** +* Tool functions +******************************************/ +FSE_PUBLIC_API size_t FSE_compressBound(size_t size); /* maximum compressed size */ + +/* Error Management */ +FSE_PUBLIC_API unsigned FSE_isError(size_t code); /* tells if a return value is an error code */ +FSE_PUBLIC_API const char* FSE_getErrorName(size_t code); /* provides error code string (useful for debugging) */ + + +/*-***************************************** +* FSE advanced functions +******************************************/ +/*! FSE_compress2() : + Same as FSE_compress(), but allows the selection of 'maxSymbolValue' and 'tableLog' + Both parameters can be defined as '0' to mean : use default value + @return : size of compressed data + Special values : if return == 0, srcData is not compressible => Nothing is stored within cSrc !!! + if return == 1, srcData is a single byte symbol * srcSize times. Use RLE compression. + if FSE_isError(return), it's an error code. +*/ +FSE_PUBLIC_API size_t FSE_compress2 (void* dst, size_t dstSize, const void* src, size_t srcSize, unsigned maxSymbolValue, unsigned tableLog); + + +/*-***************************************** +* FSE detailed API +******************************************/ +/*! +FSE_compress() does the following: +1. count symbol occurrence from source[] into table count[] (see hist.h) +2. normalize counters so that sum(count[]) == Power_of_2 (2^tableLog) +3. save normalized counters to memory buffer using writeNCount() +4. build encoding table 'CTable' from normalized counters +5. encode the data stream using encoding table 'CTable' + +FSE_decompress() does the following: +1. read normalized counters with readNCount() +2. build decoding table 'DTable' from normalized counters +3. decode the data stream using decoding table 'DTable' + +The following API allows targeting specific sub-functions for advanced tasks. +For example, it's possible to compress several blocks using the same 'CTable', +or to save and provide normalized distribution using external method. +*/ + +/* *** COMPRESSION *** */ + +/*! FSE_optimalTableLog(): + dynamically downsize 'tableLog' when conditions are met. + It saves CPU time, by using smaller tables, while preserving or even improving compression ratio. + @return : recommended tableLog (necessarily <= 'maxTableLog') */ +FSE_PUBLIC_API unsigned FSE_optimalTableLog(unsigned maxTableLog, size_t srcSize, unsigned maxSymbolValue); + +/*! FSE_normalizeCount(): + normalize counts so that sum(count[]) == Power_of_2 (2^tableLog) + 'normalizedCounter' is a table of short, of minimum size (maxSymbolValue+1). + useLowProbCount is a boolean parameter which trades off compressed size for + faster header decoding. When it is set to 1, the compressed data will be slightly + smaller. And when it is set to 0, FSE_readNCount() and FSE_buildDTable() will be + faster. If you are compressing a small amount of data (< 2 KB) then useLowProbCount=0 + is a good default, since header deserialization makes a big speed difference. + Otherwise, useLowProbCount=1 is a good default, since the speed difference is small. + @return : tableLog, + or an errorCode, which can be tested using FSE_isError() */ +FSE_PUBLIC_API size_t FSE_normalizeCount(short* normalizedCounter, unsigned tableLog, + const unsigned* count, size_t srcSize, unsigned maxSymbolValue, unsigned useLowProbCount); + +/*! FSE_NCountWriteBound(): + Provides the maximum possible size of an FSE normalized table, given 'maxSymbolValue' and 'tableLog'. + Typically useful for allocation purpose. */ +FSE_PUBLIC_API size_t FSE_NCountWriteBound(unsigned maxSymbolValue, unsigned tableLog); + +/*! FSE_writeNCount(): + Compactly save 'normalizedCounter' into 'buffer'. + @return : size of the compressed table, + or an errorCode, which can be tested using FSE_isError(). */ +FSE_PUBLIC_API size_t FSE_writeNCount (void* buffer, size_t bufferSize, + const short* normalizedCounter, + unsigned maxSymbolValue, unsigned tableLog); + +/*! Constructor and Destructor of FSE_CTable. + Note that FSE_CTable size depends on 'tableLog' and 'maxSymbolValue' */ +typedef unsigned FSE_CTable; /* don't allocate that. It's only meant to be more restrictive than void* */ +FSE_PUBLIC_API FSE_CTable* FSE_createCTable (unsigned maxSymbolValue, unsigned tableLog); +FSE_PUBLIC_API void FSE_freeCTable (FSE_CTable* ct); + +/*! FSE_buildCTable(): + Builds `ct`, which must be already allocated, using FSE_createCTable(). + @return : 0, or an errorCode, which can be tested using FSE_isError() */ +FSE_PUBLIC_API size_t FSE_buildCTable(FSE_CTable* ct, const short* normalizedCounter, unsigned maxSymbolValue, unsigned tableLog); + +/*! FSE_compress_usingCTable(): + Compress `src` using `ct` into `dst` which must be already allocated. + @return : size of compressed data (<= `dstCapacity`), + or 0 if compressed data could not fit into `dst`, + or an errorCode, which can be tested using FSE_isError() */ +FSE_PUBLIC_API size_t FSE_compress_usingCTable (void* dst, size_t dstCapacity, const void* src, size_t srcSize, const FSE_CTable* ct); + +/*! +Tutorial : +---------- +The first step is to count all symbols. FSE_count() does this job very fast. +Result will be saved into 'count', a table of unsigned int, which must be already allocated, and have 'maxSymbolValuePtr[0]+1' cells. +'src' is a table of bytes of size 'srcSize'. All values within 'src' MUST be <= maxSymbolValuePtr[0] +maxSymbolValuePtr[0] will be updated, with its real value (necessarily <= original value) +FSE_count() will return the number of occurrence of the most frequent symbol. +This can be used to know if there is a single symbol within 'src', and to quickly evaluate its compressibility. +If there is an error, the function will return an ErrorCode (which can be tested using FSE_isError()). + +The next step is to normalize the frequencies. +FSE_normalizeCount() will ensure that sum of frequencies is == 2 ^'tableLog'. +It also guarantees a minimum of 1 to any Symbol with frequency >= 1. +You can use 'tableLog'==0 to mean "use default tableLog value". +If you are unsure of which tableLog value to use, you can ask FSE_optimalTableLog(), +which will provide the optimal valid tableLog given sourceSize, maxSymbolValue, and a user-defined maximum (0 means "default"). + +The result of FSE_normalizeCount() will be saved into a table, +called 'normalizedCounter', which is a table of signed short. +'normalizedCounter' must be already allocated, and have at least 'maxSymbolValue+1' cells. +The return value is tableLog if everything proceeded as expected. +It is 0 if there is a single symbol within distribution. +If there is an error (ex: invalid tableLog value), the function will return an ErrorCode (which can be tested using FSE_isError()). + +'normalizedCounter' can be saved in a compact manner to a memory area using FSE_writeNCount(). +'buffer' must be already allocated. +For guaranteed success, buffer size must be at least FSE_headerBound(). +The result of the function is the number of bytes written into 'buffer'. +If there is an error, the function will return an ErrorCode (which can be tested using FSE_isError(); ex : buffer size too small). + +'normalizedCounter' can then be used to create the compression table 'CTable'. +The space required by 'CTable' must be already allocated, using FSE_createCTable(). +You can then use FSE_buildCTable() to fill 'CTable'. +If there is an error, both functions will return an ErrorCode (which can be tested using FSE_isError()). + +'CTable' can then be used to compress 'src', with FSE_compress_usingCTable(). +Similar to FSE_count(), the convention is that 'src' is assumed to be a table of char of size 'srcSize' +The function returns the size of compressed data (without header), necessarily <= `dstCapacity`. +If it returns '0', compressed data could not fit into 'dst'. +If there is an error, the function will return an ErrorCode (which can be tested using FSE_isError()). +*/ + + +/* *** DECOMPRESSION *** */ + +/*! FSE_readNCount(): + Read compactly saved 'normalizedCounter' from 'rBuffer'. + @return : size read from 'rBuffer', + or an errorCode, which can be tested using FSE_isError(). + maxSymbolValuePtr[0] and tableLogPtr[0] will also be updated with their respective values */ +FSE_PUBLIC_API size_t FSE_readNCount (short* normalizedCounter, + unsigned* maxSymbolValuePtr, unsigned* tableLogPtr, + const void* rBuffer, size_t rBuffSize); + +/*! FSE_readNCount_bmi2(): + * Same as FSE_readNCount() but pass bmi2=1 when your CPU supports BMI2 and 0 otherwise. + */ +FSE_PUBLIC_API size_t FSE_readNCount_bmi2(short* normalizedCounter, + unsigned* maxSymbolValuePtr, unsigned* tableLogPtr, + const void* rBuffer, size_t rBuffSize, int bmi2); + +/*! Constructor and Destructor of FSE_DTable. + Note that its size depends on 'tableLog' */ +typedef unsigned FSE_DTable; /* don't allocate that. It's just a way to be more restrictive than void* */ +FSE_PUBLIC_API FSE_DTable* FSE_createDTable(unsigned tableLog); +FSE_PUBLIC_API void FSE_freeDTable(FSE_DTable* dt); + +/*! FSE_buildDTable(): + Builds 'dt', which must be already allocated, using FSE_createDTable(). + return : 0, or an errorCode, which can be tested using FSE_isError() */ +FSE_PUBLIC_API size_t FSE_buildDTable (FSE_DTable* dt, const short* normalizedCounter, unsigned maxSymbolValue, unsigned tableLog); + +/*! FSE_decompress_usingDTable(): + Decompress compressed source `cSrc` of size `cSrcSize` using `dt` + into `dst` which must be already allocated. + @return : size of regenerated data (necessarily <= `dstCapacity`), + or an errorCode, which can be tested using FSE_isError() */ +FSE_PUBLIC_API size_t FSE_decompress_usingDTable(void* dst, size_t dstCapacity, const void* cSrc, size_t cSrcSize, const FSE_DTable* dt); + +/*! +Tutorial : +---------- +(Note : these functions only decompress FSE-compressed blocks. + If block is uncompressed, use memcpy() instead + If block is a single repeated byte, use memset() instead ) + +The first step is to obtain the normalized frequencies of symbols. +This can be performed by FSE_readNCount() if it was saved using FSE_writeNCount(). +'normalizedCounter' must be already allocated, and have at least 'maxSymbolValuePtr[0]+1' cells of signed short. +In practice, that means it's necessary to know 'maxSymbolValue' beforehand, +or size the table to handle worst case situations (typically 256). +FSE_readNCount() will provide 'tableLog' and 'maxSymbolValue'. +The result of FSE_readNCount() is the number of bytes read from 'rBuffer'. +Note that 'rBufferSize' must be at least 4 bytes, even if useful information is less than that. +If there is an error, the function will return an error code, which can be tested using FSE_isError(). + +The next step is to build the decompression tables 'FSE_DTable' from 'normalizedCounter'. +This is performed by the function FSE_buildDTable(). +The space required by 'FSE_DTable' must be already allocated using FSE_createDTable(). +If there is an error, the function will return an error code, which can be tested using FSE_isError(). + +`FSE_DTable` can then be used to decompress `cSrc`, with FSE_decompress_usingDTable(). +`cSrcSize` must be strictly correct, otherwise decompression will fail. +FSE_decompress_usingDTable() result will tell how many bytes were regenerated (<=`dstCapacity`). +If there is an error, the function will return an error code, which can be tested using FSE_isError(). (ex: dst buffer too small) +*/ + +#endif /* FSE_H */ + +#if defined(FSE_STATIC_LINKING_ONLY) && !defined(FSE_H_FSE_STATIC_LINKING_ONLY) +#define FSE_H_FSE_STATIC_LINKING_ONLY + +/* *** Dependency *** */ +#include "bitstream.h" + + +/* ***************************************** +* Static allocation +*******************************************/ +/* FSE buffer bounds */ +#define FSE_NCOUNTBOUND 512 +#define FSE_BLOCKBOUND(size) ((size) + ((size)>>7) + 4 /* fse states */ + sizeof(size_t) /* bitContainer */) +#define FSE_COMPRESSBOUND(size) (FSE_NCOUNTBOUND + FSE_BLOCKBOUND(size)) /* Macro version, useful for static allocation */ + +/* It is possible to statically allocate FSE CTable/DTable as a table of FSE_CTable/FSE_DTable using below macros */ +#define FSE_CTABLE_SIZE_U32(maxTableLog, maxSymbolValue) (1 + (1<<((maxTableLog)-1)) + (((maxSymbolValue)+1)*2)) +#define FSE_DTABLE_SIZE_U32(maxTableLog) (1 + (1<<(maxTableLog))) + +/* or use the size to malloc() space directly. Pay attention to alignment restrictions though */ +#define FSE_CTABLE_SIZE(maxTableLog, maxSymbolValue) (FSE_CTABLE_SIZE_U32(maxTableLog, maxSymbolValue) * sizeof(FSE_CTable)) +#define FSE_DTABLE_SIZE(maxTableLog) (FSE_DTABLE_SIZE_U32(maxTableLog) * sizeof(FSE_DTable)) + + +/* ***************************************** + * FSE advanced API + ***************************************** */ + +unsigned FSE_optimalTableLog_internal(unsigned maxTableLog, size_t srcSize, unsigned maxSymbolValue, unsigned minus); +/**< same as FSE_optimalTableLog(), which used `minus==2` */ + +/* FSE_compress_wksp() : + * Same as FSE_compress2(), but using an externally allocated scratch buffer (`workSpace`). + * FSE_COMPRESS_WKSP_SIZE_U32() provides the minimum size required for `workSpace` as a table of FSE_CTable. + */ +#define FSE_COMPRESS_WKSP_SIZE_U32(maxTableLog, maxSymbolValue) ( FSE_CTABLE_SIZE_U32(maxTableLog, maxSymbolValue) + ((maxTableLog > 12) ? (1 << (maxTableLog - 2)) : 1024) ) +size_t FSE_compress_wksp (void* dst, size_t dstSize, const void* src, size_t srcSize, unsigned maxSymbolValue, unsigned tableLog, void* workSpace, size_t wkspSize); + +size_t FSE_buildCTable_raw (FSE_CTable* ct, unsigned nbBits); +/**< build a fake FSE_CTable, designed for a flat distribution, where each symbol uses nbBits */ + +size_t FSE_buildCTable_rle (FSE_CTable* ct, unsigned char symbolValue); +/**< build a fake FSE_CTable, designed to compress always the same symbolValue */ + +/* FSE_buildCTable_wksp() : + * Same as FSE_buildCTable(), but using an externally allocated scratch buffer (`workSpace`). + * `wkspSize` must be >= `FSE_BUILD_CTABLE_WORKSPACE_SIZE_U32(maxSymbolValue, tableLog)` of `unsigned`. + */ +#define FSE_BUILD_CTABLE_WORKSPACE_SIZE_U32(maxSymbolValue, tableLog) (maxSymbolValue + 2 + (1ull << (tableLog - 2))) +#define FSE_BUILD_CTABLE_WORKSPACE_SIZE(maxSymbolValue, tableLog) (sizeof(unsigned) * FSE_BUILD_CTABLE_WORKSPACE_SIZE_U32(maxSymbolValue, tableLog)) +size_t FSE_buildCTable_wksp(FSE_CTable* ct, const short* normalizedCounter, unsigned maxSymbolValue, unsigned tableLog, void* workSpace, size_t wkspSize); + +#define FSE_BUILD_DTABLE_WKSP_SIZE(maxTableLog, maxSymbolValue) (sizeof(short) * (maxSymbolValue + 1) + (1ULL << maxTableLog) + 8) +#define FSE_BUILD_DTABLE_WKSP_SIZE_U32(maxTableLog, maxSymbolValue) ((FSE_BUILD_DTABLE_WKSP_SIZE(maxTableLog, maxSymbolValue) + sizeof(unsigned) - 1) / sizeof(unsigned)) +FSE_PUBLIC_API size_t FSE_buildDTable_wksp(FSE_DTable* dt, const short* normalizedCounter, unsigned maxSymbolValue, unsigned tableLog, void* workSpace, size_t wkspSize); +/**< Same as FSE_buildDTable(), using an externally allocated `workspace` produced with `FSE_BUILD_DTABLE_WKSP_SIZE_U32(maxSymbolValue)` */ + +size_t FSE_buildDTable_raw (FSE_DTable* dt, unsigned nbBits); +/**< build a fake FSE_DTable, designed to read a flat distribution where each symbol uses nbBits */ + +size_t FSE_buildDTable_rle (FSE_DTable* dt, unsigned char symbolValue); +/**< build a fake FSE_DTable, designed to always generate the same symbolValue */ + +#define FSE_DECOMPRESS_WKSP_SIZE_U32(maxTableLog, maxSymbolValue) (FSE_DTABLE_SIZE_U32(maxTableLog) + FSE_BUILD_DTABLE_WKSP_SIZE_U32(maxTableLog, maxSymbolValue) + (FSE_MAX_SYMBOL_VALUE + 1) / 2 + 1) +#define FSE_DECOMPRESS_WKSP_SIZE(maxTableLog, maxSymbolValue) (FSE_DECOMPRESS_WKSP_SIZE_U32(maxTableLog, maxSymbolValue) * sizeof(unsigned)) +size_t FSE_decompress_wksp(void* dst, size_t dstCapacity, const void* cSrc, size_t cSrcSize, unsigned maxLog, void* workSpace, size_t wkspSize); +/**< same as FSE_decompress(), using an externally allocated `workSpace` produced with `FSE_DECOMPRESS_WKSP_SIZE_U32(maxLog, maxSymbolValue)` */ + +size_t FSE_decompress_wksp_bmi2(void* dst, size_t dstCapacity, const void* cSrc, size_t cSrcSize, unsigned maxLog, void* workSpace, size_t wkspSize, int bmi2); +/**< Same as FSE_decompress_wksp() but with dynamic BMI2 support. Pass 1 if your CPU supports BMI2 or 0 if it doesn't. */ + +typedef enum { + FSE_repeat_none, /**< Cannot use the previous table */ + FSE_repeat_check, /**< Can use the previous table but it must be checked */ + FSE_repeat_valid /**< Can use the previous table and it is assumed to be valid */ + } FSE_repeat; + +/* ***************************************** +* FSE symbol compression API +*******************************************/ +/*! + This API consists of small unitary functions, which highly benefit from being inlined. + Hence their body are included in next section. +*/ +typedef struct { + ptrdiff_t value; + const void* stateTable; + const void* symbolTT; + unsigned stateLog; +} FSE_CState_t; + +static void FSE_initCState(FSE_CState_t* CStatePtr, const FSE_CTable* ct); + +static void FSE_encodeSymbol(BIT_CStream_t* bitC, FSE_CState_t* CStatePtr, unsigned symbol); + +static void FSE_flushCState(BIT_CStream_t* bitC, const FSE_CState_t* CStatePtr); + +/**< +These functions are inner components of FSE_compress_usingCTable(). +They allow the creation of custom streams, mixing multiple tables and bit sources. + +A key property to keep in mind is that encoding and decoding are done **in reverse direction**. +So the first symbol you will encode is the last you will decode, like a LIFO stack. + +You will need a few variables to track your CStream. They are : + +FSE_CTable ct; // Provided by FSE_buildCTable() +BIT_CStream_t bitStream; // bitStream tracking structure +FSE_CState_t state; // State tracking structure (can have several) + + +The first thing to do is to init bitStream and state. + size_t errorCode = BIT_initCStream(&bitStream, dstBuffer, maxDstSize); + FSE_initCState(&state, ct); + +Note that BIT_initCStream() can produce an error code, so its result should be tested, using FSE_isError(); +You can then encode your input data, byte after byte. +FSE_encodeSymbol() outputs a maximum of 'tableLog' bits at a time. +Remember decoding will be done in reverse direction. + FSE_encodeByte(&bitStream, &state, symbol); + +At any time, you can also add any bit sequence. +Note : maximum allowed nbBits is 25, for compatibility with 32-bits decoders + BIT_addBits(&bitStream, bitField, nbBits); + +The above methods don't commit data to memory, they just store it into local register, for speed. +Local register size is 64-bits on 64-bits systems, 32-bits on 32-bits systems (size_t). +Writing data to memory is a manual operation, performed by the flushBits function. + BIT_flushBits(&bitStream); + +Your last FSE encoding operation shall be to flush your last state value(s). + FSE_flushState(&bitStream, &state); + +Finally, you must close the bitStream. +The function returns the size of CStream in bytes. +If data couldn't fit into dstBuffer, it will return a 0 ( == not compressible) +If there is an error, it returns an errorCode (which can be tested using FSE_isError()). + size_t size = BIT_closeCStream(&bitStream); +*/ + + +/* ***************************************** +* FSE symbol decompression API +*******************************************/ +typedef struct { + size_t state; + const void* table; /* precise table may vary, depending on U16 */ +} FSE_DState_t; + + +static void FSE_initDState(FSE_DState_t* DStatePtr, BIT_DStream_t* bitD, const FSE_DTable* dt); + +static unsigned char FSE_decodeSymbol(FSE_DState_t* DStatePtr, BIT_DStream_t* bitD); + +static unsigned FSE_endOfDState(const FSE_DState_t* DStatePtr); + +/**< +Let's now decompose FSE_decompress_usingDTable() into its unitary components. +You will decode FSE-encoded symbols from the bitStream, +and also any other bitFields you put in, **in reverse order**. + +You will need a few variables to track your bitStream. They are : + +BIT_DStream_t DStream; // Stream context +FSE_DState_t DState; // State context. Multiple ones are possible +FSE_DTable* DTablePtr; // Decoding table, provided by FSE_buildDTable() + +The first thing to do is to init the bitStream. + errorCode = BIT_initDStream(&DStream, srcBuffer, srcSize); + +You should then retrieve your initial state(s) +(in reverse flushing order if you have several ones) : + errorCode = FSE_initDState(&DState, &DStream, DTablePtr); + +You can then decode your data, symbol after symbol. +For information the maximum number of bits read by FSE_decodeSymbol() is 'tableLog'. +Keep in mind that symbols are decoded in reverse order, like a LIFO stack (last in, first out). + unsigned char symbol = FSE_decodeSymbol(&DState, &DStream); + +You can retrieve any bitfield you eventually stored into the bitStream (in reverse order) +Note : maximum allowed nbBits is 25, for 32-bits compatibility + size_t bitField = BIT_readBits(&DStream, nbBits); + +All above operations only read from local register (which size depends on size_t). +Refueling the register from memory is manually performed by the reload method. + endSignal = FSE_reloadDStream(&DStream); + +BIT_reloadDStream() result tells if there is still some more data to read from DStream. +BIT_DStream_unfinished : there is still some data left into the DStream. +BIT_DStream_endOfBuffer : Dstream reached end of buffer. Its container may no longer be completely filled. +BIT_DStream_completed : Dstream reached its exact end, corresponding in general to decompression completed. +BIT_DStream_tooFar : Dstream went too far. Decompression result is corrupted. + +When reaching end of buffer (BIT_DStream_endOfBuffer), progress slowly, notably if you decode multiple symbols per loop, +to properly detect the exact end of stream. +After each decoded symbol, check if DStream is fully consumed using this simple test : + BIT_reloadDStream(&DStream) >= BIT_DStream_completed + +When it's done, verify decompression is fully completed, by checking both DStream and the relevant states. +Checking if DStream has reached its end is performed by : + BIT_endOfDStream(&DStream); +Check also the states. There might be some symbols left there, if some high probability ones (>50%) are possible. + FSE_endOfDState(&DState); +*/ + + +/* ***************************************** +* FSE unsafe API +*******************************************/ +static unsigned char FSE_decodeSymbolFast(FSE_DState_t* DStatePtr, BIT_DStream_t* bitD); +/* faster, but works only if nbBits is always >= 1 (otherwise, result will be corrupted) */ + + +/* ***************************************** +* Implementation of inlined functions +*******************************************/ +typedef struct { + int deltaFindState; + U32 deltaNbBits; +} FSE_symbolCompressionTransform; /* total 8 bytes */ + +MEM_STATIC void FSE_initCState(FSE_CState_t* statePtr, const FSE_CTable* ct) +{ + const void* ptr = ct; + const U16* u16ptr = (const U16*) ptr; + const U32 tableLog = MEM_read16(ptr); + statePtr->value = (ptrdiff_t)1<stateTable = u16ptr+2; + statePtr->symbolTT = ct + 1 + (tableLog ? (1<<(tableLog-1)) : 1); + statePtr->stateLog = tableLog; +} + + +/*! FSE_initCState2() : +* Same as FSE_initCState(), but the first symbol to include (which will be the last to be read) +* uses the smallest state value possible, saving the cost of this symbol */ +MEM_STATIC void FSE_initCState2(FSE_CState_t* statePtr, const FSE_CTable* ct, U32 symbol) +{ + FSE_initCState(statePtr, ct); + { const FSE_symbolCompressionTransform symbolTT = ((const FSE_symbolCompressionTransform*)(statePtr->symbolTT))[symbol]; + const U16* stateTable = (const U16*)(statePtr->stateTable); + U32 nbBitsOut = (U32)((symbolTT.deltaNbBits + (1<<15)) >> 16); + statePtr->value = (nbBitsOut << 16) - symbolTT.deltaNbBits; + statePtr->value = stateTable[(statePtr->value >> nbBitsOut) + symbolTT.deltaFindState]; + } +} + +MEM_STATIC void FSE_encodeSymbol(BIT_CStream_t* bitC, FSE_CState_t* statePtr, unsigned symbol) +{ + FSE_symbolCompressionTransform const symbolTT = ((const FSE_symbolCompressionTransform*)(statePtr->symbolTT))[symbol]; + const U16* const stateTable = (const U16*)(statePtr->stateTable); + U32 const nbBitsOut = (U32)((statePtr->value + symbolTT.deltaNbBits) >> 16); + BIT_addBits(bitC, statePtr->value, nbBitsOut); + statePtr->value = stateTable[ (statePtr->value >> nbBitsOut) + symbolTT.deltaFindState]; +} + +MEM_STATIC void FSE_flushCState(BIT_CStream_t* bitC, const FSE_CState_t* statePtr) +{ + BIT_addBits(bitC, statePtr->value, statePtr->stateLog); + BIT_flushBits(bitC); +} + + +/* FSE_getMaxNbBits() : + * Approximate maximum cost of a symbol, in bits. + * Fractional get rounded up (i.e : a symbol with a normalized frequency of 3 gives the same result as a frequency of 2) + * note 1 : assume symbolValue is valid (<= maxSymbolValue) + * note 2 : if freq[symbolValue]==0, @return a fake cost of tableLog+1 bits */ +MEM_STATIC U32 FSE_getMaxNbBits(const void* symbolTTPtr, U32 symbolValue) +{ + const FSE_symbolCompressionTransform* symbolTT = (const FSE_symbolCompressionTransform*) symbolTTPtr; + return (symbolTT[symbolValue].deltaNbBits + ((1<<16)-1)) >> 16; +} + +/* FSE_bitCost() : + * Approximate symbol cost, as fractional value, using fixed-point format (accuracyLog fractional bits) + * note 1 : assume symbolValue is valid (<= maxSymbolValue) + * note 2 : if freq[symbolValue]==0, @return a fake cost of tableLog+1 bits */ +MEM_STATIC U32 FSE_bitCost(const void* symbolTTPtr, U32 tableLog, U32 symbolValue, U32 accuracyLog) +{ + const FSE_symbolCompressionTransform* symbolTT = (const FSE_symbolCompressionTransform*) symbolTTPtr; + U32 const minNbBits = symbolTT[symbolValue].deltaNbBits >> 16; + U32 const threshold = (minNbBits+1) << 16; + assert(tableLog < 16); + assert(accuracyLog < 31-tableLog); /* ensure enough room for renormalization double shift */ + { U32 const tableSize = 1 << tableLog; + U32 const deltaFromThreshold = threshold - (symbolTT[symbolValue].deltaNbBits + tableSize); + U32 const normalizedDeltaFromThreshold = (deltaFromThreshold << accuracyLog) >> tableLog; /* linear interpolation (very approximate) */ + U32 const bitMultiplier = 1 << accuracyLog; + assert(symbolTT[symbolValue].deltaNbBits + tableSize <= threshold); + assert(normalizedDeltaFromThreshold <= bitMultiplier); + return (minNbBits+1)*bitMultiplier - normalizedDeltaFromThreshold; + } +} + + +/* ====== Decompression ====== */ + +typedef struct { + U16 tableLog; + U16 fastMode; +} FSE_DTableHeader; /* sizeof U32 */ + +typedef struct +{ + unsigned short newState; + unsigned char symbol; + unsigned char nbBits; +} FSE_decode_t; /* size == U32 */ + +MEM_STATIC void FSE_initDState(FSE_DState_t* DStatePtr, BIT_DStream_t* bitD, const FSE_DTable* dt) +{ + const void* ptr = dt; + const FSE_DTableHeader* const DTableH = (const FSE_DTableHeader*)ptr; + DStatePtr->state = BIT_readBits(bitD, DTableH->tableLog); + BIT_reloadDStream(bitD); + DStatePtr->table = dt + 1; +} + +MEM_STATIC BYTE FSE_peekSymbol(const FSE_DState_t* DStatePtr) +{ + FSE_decode_t const DInfo = ((const FSE_decode_t*)(DStatePtr->table))[DStatePtr->state]; + return DInfo.symbol; +} + +MEM_STATIC void FSE_updateState(FSE_DState_t* DStatePtr, BIT_DStream_t* bitD) +{ + FSE_decode_t const DInfo = ((const FSE_decode_t*)(DStatePtr->table))[DStatePtr->state]; + U32 const nbBits = DInfo.nbBits; + size_t const lowBits = BIT_readBits(bitD, nbBits); + DStatePtr->state = DInfo.newState + lowBits; +} + +MEM_STATIC BYTE FSE_decodeSymbol(FSE_DState_t* DStatePtr, BIT_DStream_t* bitD) +{ + FSE_decode_t const DInfo = ((const FSE_decode_t*)(DStatePtr->table))[DStatePtr->state]; + U32 const nbBits = DInfo.nbBits; + BYTE const symbol = DInfo.symbol; + size_t const lowBits = BIT_readBits(bitD, nbBits); + + DStatePtr->state = DInfo.newState + lowBits; + return symbol; +} + +/*! FSE_decodeSymbolFast() : + unsafe, only works if no symbol has a probability > 50% */ +MEM_STATIC BYTE FSE_decodeSymbolFast(FSE_DState_t* DStatePtr, BIT_DStream_t* bitD) +{ + FSE_decode_t const DInfo = ((const FSE_decode_t*)(DStatePtr->table))[DStatePtr->state]; + U32 const nbBits = DInfo.nbBits; + BYTE const symbol = DInfo.symbol; + size_t const lowBits = BIT_readBitsFast(bitD, nbBits); + + DStatePtr->state = DInfo.newState + lowBits; + return symbol; +} + +MEM_STATIC unsigned FSE_endOfDState(const FSE_DState_t* DStatePtr) +{ + return DStatePtr->state == 0; +} + + + +#ifndef FSE_COMMONDEFS_ONLY + +/* ************************************************************** +* Tuning parameters +****************************************************************/ +/*!MEMORY_USAGE : +* Memory usage formula : N->2^N Bytes (examples : 10 -> 1KB; 12 -> 4KB ; 16 -> 64KB; 20 -> 1MB; etc.) +* Increasing memory usage improves compression ratio +* Reduced memory usage can improve speed, due to cache effect +* Recommended max value is 14, for 16KB, which nicely fits into Intel x86 L1 cache */ +#ifndef FSE_MAX_MEMORY_USAGE +# define FSE_MAX_MEMORY_USAGE 14 +#endif +#ifndef FSE_DEFAULT_MEMORY_USAGE +# define FSE_DEFAULT_MEMORY_USAGE 13 +#endif +#if (FSE_DEFAULT_MEMORY_USAGE > FSE_MAX_MEMORY_USAGE) +# error "FSE_DEFAULT_MEMORY_USAGE must be <= FSE_MAX_MEMORY_USAGE" +#endif + +/*!FSE_MAX_SYMBOL_VALUE : +* Maximum symbol value authorized. +* Required for proper stack allocation */ +#ifndef FSE_MAX_SYMBOL_VALUE +# define FSE_MAX_SYMBOL_VALUE 255 +#endif + +/* ************************************************************** +* template functions type & suffix +****************************************************************/ +#define FSE_FUNCTION_TYPE BYTE +#define FSE_FUNCTION_EXTENSION +#define FSE_DECODE_TYPE FSE_decode_t + + +#endif /* !FSE_COMMONDEFS_ONLY */ + + +/* *************************************************************** +* Constants +*****************************************************************/ +#define FSE_MAX_TABLELOG (FSE_MAX_MEMORY_USAGE-2) +#define FSE_MAX_TABLESIZE (1U< FSE_TABLELOG_ABSOLUTE_MAX +# error "FSE_MAX_TABLELOG > FSE_TABLELOG_ABSOLUTE_MAX is not supported" +#endif + +#define FSE_TABLESTEP(tableSize) (((tableSize)>>1) + ((tableSize)>>3) + 3) + + +#endif /* FSE_STATIC_LINKING_ONLY */ + + +#if defined (__cplusplus) +} +#endif diff --git a/external/zstd/lib/common/fse_decompress.c b/external/zstd/lib/common/fse_decompress.c new file mode 100644 index 00000000..f4ff58fa --- /dev/null +++ b/external/zstd/lib/common/fse_decompress.c @@ -0,0 +1,403 @@ +/* ****************************************************************** + * FSE : Finite State Entropy decoder + * Copyright (c) Yann Collet, Facebook, Inc. + * + * You can contact the author at : + * - FSE source repository : https://github.com/Cyan4973/FiniteStateEntropy + * - Public forum : https://groups.google.com/forum/#!forum/lz4c + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. +****************************************************************** */ + + +/* ************************************************************** +* Includes +****************************************************************/ +#include "debug.h" /* assert */ +#include "bitstream.h" +#include "compiler.h" +#define FSE_STATIC_LINKING_ONLY +#include "fse.h" +#include "error_private.h" +#define ZSTD_DEPS_NEED_MALLOC +#include "zstd_deps.h" + + +/* ************************************************************** +* Error Management +****************************************************************/ +#define FSE_isError ERR_isError +#define FSE_STATIC_ASSERT(c) DEBUG_STATIC_ASSERT(c) /* use only *after* variable declarations */ + + +/* ************************************************************** +* Templates +****************************************************************/ +/* + designed to be included + for type-specific functions (template emulation in C) + Objective is to write these functions only once, for improved maintenance +*/ + +/* safety checks */ +#ifndef FSE_FUNCTION_EXTENSION +# error "FSE_FUNCTION_EXTENSION must be defined" +#endif +#ifndef FSE_FUNCTION_TYPE +# error "FSE_FUNCTION_TYPE must be defined" +#endif + +/* Function names */ +#define FSE_CAT(X,Y) X##Y +#define FSE_FUNCTION_NAME(X,Y) FSE_CAT(X,Y) +#define FSE_TYPE_NAME(X,Y) FSE_CAT(X,Y) + + +/* Function templates */ +FSE_DTable* FSE_createDTable (unsigned tableLog) +{ + if (tableLog > FSE_TABLELOG_ABSOLUTE_MAX) tableLog = FSE_TABLELOG_ABSOLUTE_MAX; + return (FSE_DTable*)ZSTD_malloc( FSE_DTABLE_SIZE_U32(tableLog) * sizeof (U32) ); +} + +void FSE_freeDTable (FSE_DTable* dt) +{ + ZSTD_free(dt); +} + +static size_t FSE_buildDTable_internal(FSE_DTable* dt, const short* normalizedCounter, unsigned maxSymbolValue, unsigned tableLog, void* workSpace, size_t wkspSize) +{ + void* const tdPtr = dt+1; /* because *dt is unsigned, 32-bits aligned on 32-bits */ + FSE_DECODE_TYPE* const tableDecode = (FSE_DECODE_TYPE*) (tdPtr); + U16* symbolNext = (U16*)workSpace; + BYTE* spread = (BYTE*)(symbolNext + maxSymbolValue + 1); + + U32 const maxSV1 = maxSymbolValue + 1; + U32 const tableSize = 1 << tableLog; + U32 highThreshold = tableSize-1; + + /* Sanity Checks */ + if (FSE_BUILD_DTABLE_WKSP_SIZE(tableLog, maxSymbolValue) > wkspSize) return ERROR(maxSymbolValue_tooLarge); + if (maxSymbolValue > FSE_MAX_SYMBOL_VALUE) return ERROR(maxSymbolValue_tooLarge); + if (tableLog > FSE_MAX_TABLELOG) return ERROR(tableLog_tooLarge); + + /* Init, lay down lowprob symbols */ + { FSE_DTableHeader DTableH; + DTableH.tableLog = (U16)tableLog; + DTableH.fastMode = 1; + { S16 const largeLimit= (S16)(1 << (tableLog-1)); + U32 s; + for (s=0; s= largeLimit) DTableH.fastMode=0; + symbolNext[s] = normalizedCounter[s]; + } } } + ZSTD_memcpy(dt, &DTableH, sizeof(DTableH)); + } + + /* Spread symbols */ + if (highThreshold == tableSize - 1) { + size_t const tableMask = tableSize-1; + size_t const step = FSE_TABLESTEP(tableSize); + /* First lay down the symbols in order. + * We use a uint64_t to lay down 8 bytes at a time. This reduces branch + * misses since small blocks generally have small table logs, so nearly + * all symbols have counts <= 8. We ensure we have 8 bytes at the end of + * our buffer to handle the over-write. + */ + { + U64 const add = 0x0101010101010101ull; + size_t pos = 0; + U64 sv = 0; + U32 s; + for (s=0; s highThreshold) position = (position + step) & tableMask; /* lowprob area */ + } } + if (position!=0) return ERROR(GENERIC); /* position must reach all cells once, otherwise normalizedCounter is incorrect */ + } + + /* Build Decoding table */ + { U32 u; + for (u=0; utableLog = 0; + DTableH->fastMode = 0; + + cell->newState = 0; + cell->symbol = symbolValue; + cell->nbBits = 0; + + return 0; +} + + +size_t FSE_buildDTable_raw (FSE_DTable* dt, unsigned nbBits) +{ + void* ptr = dt; + FSE_DTableHeader* const DTableH = (FSE_DTableHeader*)ptr; + void* dPtr = dt + 1; + FSE_decode_t* const dinfo = (FSE_decode_t*)dPtr; + const unsigned tableSize = 1 << nbBits; + const unsigned tableMask = tableSize - 1; + const unsigned maxSV1 = tableMask+1; + unsigned s; + + /* Sanity checks */ + if (nbBits < 1) return ERROR(GENERIC); /* min size */ + + /* Build Decoding Table */ + DTableH->tableLog = (U16)nbBits; + DTableH->fastMode = 1; + for (s=0; s sizeof(bitD.bitContainer)*8) /* This test must be static */ + BIT_reloadDStream(&bitD); + + op[1] = FSE_GETSYMBOL(&state2); + + if (FSE_MAX_TABLELOG*4+7 > sizeof(bitD.bitContainer)*8) /* This test must be static */ + { if (BIT_reloadDStream(&bitD) > BIT_DStream_unfinished) { op+=2; break; } } + + op[2] = FSE_GETSYMBOL(&state1); + + if (FSE_MAX_TABLELOG*2+7 > sizeof(bitD.bitContainer)*8) /* This test must be static */ + BIT_reloadDStream(&bitD); + + op[3] = FSE_GETSYMBOL(&state2); + } + + /* tail */ + /* note : BIT_reloadDStream(&bitD) >= FSE_DStream_partiallyFilled; Ends at exactly BIT_DStream_completed */ + while (1) { + if (op>(omax-2)) return ERROR(dstSize_tooSmall); + *op++ = FSE_GETSYMBOL(&state1); + if (BIT_reloadDStream(&bitD)==BIT_DStream_overflow) { + *op++ = FSE_GETSYMBOL(&state2); + break; + } + + if (op>(omax-2)) return ERROR(dstSize_tooSmall); + *op++ = FSE_GETSYMBOL(&state2); + if (BIT_reloadDStream(&bitD)==BIT_DStream_overflow) { + *op++ = FSE_GETSYMBOL(&state1); + break; + } } + + return op-ostart; +} + + +size_t FSE_decompress_usingDTable(void* dst, size_t originalSize, + const void* cSrc, size_t cSrcSize, + const FSE_DTable* dt) +{ + const void* ptr = dt; + const FSE_DTableHeader* DTableH = (const FSE_DTableHeader*)ptr; + const U32 fastMode = DTableH->fastMode; + + /* select fast mode (static) */ + if (fastMode) return FSE_decompress_usingDTable_generic(dst, originalSize, cSrc, cSrcSize, dt, 1); + return FSE_decompress_usingDTable_generic(dst, originalSize, cSrc, cSrcSize, dt, 0); +} + + +size_t FSE_decompress_wksp(void* dst, size_t dstCapacity, const void* cSrc, size_t cSrcSize, unsigned maxLog, void* workSpace, size_t wkspSize) +{ + return FSE_decompress_wksp_bmi2(dst, dstCapacity, cSrc, cSrcSize, maxLog, workSpace, wkspSize, /* bmi2 */ 0); +} + +typedef struct { + short ncount[FSE_MAX_SYMBOL_VALUE + 1]; + FSE_DTable dtable[1]; /* Dynamically sized */ +} FSE_DecompressWksp; + + +FORCE_INLINE_TEMPLATE size_t FSE_decompress_wksp_body( + void* dst, size_t dstCapacity, + const void* cSrc, size_t cSrcSize, + unsigned maxLog, void* workSpace, size_t wkspSize, + int bmi2) +{ + const BYTE* const istart = (const BYTE*)cSrc; + const BYTE* ip = istart; + unsigned tableLog; + unsigned maxSymbolValue = FSE_MAX_SYMBOL_VALUE; + FSE_DecompressWksp* const wksp = (FSE_DecompressWksp*)workSpace; + + DEBUG_STATIC_ASSERT((FSE_MAX_SYMBOL_VALUE + 1) % 2 == 0); + if (wkspSize < sizeof(*wksp)) return ERROR(GENERIC); + + /* normal FSE decoding mode */ + { + size_t const NCountLength = FSE_readNCount_bmi2(wksp->ncount, &maxSymbolValue, &tableLog, istart, cSrcSize, bmi2); + if (FSE_isError(NCountLength)) return NCountLength; + if (tableLog > maxLog) return ERROR(tableLog_tooLarge); + assert(NCountLength <= cSrcSize); + ip += NCountLength; + cSrcSize -= NCountLength; + } + + if (FSE_DECOMPRESS_WKSP_SIZE(tableLog, maxSymbolValue) > wkspSize) return ERROR(tableLog_tooLarge); + workSpace = wksp->dtable + FSE_DTABLE_SIZE_U32(tableLog); + wkspSize -= sizeof(*wksp) + FSE_DTABLE_SIZE(tableLog); + + CHECK_F( FSE_buildDTable_internal(wksp->dtable, wksp->ncount, maxSymbolValue, tableLog, workSpace, wkspSize) ); + + { + const void* ptr = wksp->dtable; + const FSE_DTableHeader* DTableH = (const FSE_DTableHeader*)ptr; + const U32 fastMode = DTableH->fastMode; + + /* select fast mode (static) */ + if (fastMode) return FSE_decompress_usingDTable_generic(dst, dstCapacity, ip, cSrcSize, wksp->dtable, 1); + return FSE_decompress_usingDTable_generic(dst, dstCapacity, ip, cSrcSize, wksp->dtable, 0); + } +} + +/* Avoids the FORCE_INLINE of the _body() function. */ +static size_t FSE_decompress_wksp_body_default(void* dst, size_t dstCapacity, const void* cSrc, size_t cSrcSize, unsigned maxLog, void* workSpace, size_t wkspSize) +{ + return FSE_decompress_wksp_body(dst, dstCapacity, cSrc, cSrcSize, maxLog, workSpace, wkspSize, 0); +} + +#if DYNAMIC_BMI2 +TARGET_ATTRIBUTE("bmi2") static size_t FSE_decompress_wksp_body_bmi2(void* dst, size_t dstCapacity, const void* cSrc, size_t cSrcSize, unsigned maxLog, void* workSpace, size_t wkspSize) +{ + return FSE_decompress_wksp_body(dst, dstCapacity, cSrc, cSrcSize, maxLog, workSpace, wkspSize, 1); +} +#endif + +size_t FSE_decompress_wksp_bmi2(void* dst, size_t dstCapacity, const void* cSrc, size_t cSrcSize, unsigned maxLog, void* workSpace, size_t wkspSize, int bmi2) +{ +#if DYNAMIC_BMI2 + if (bmi2) { + return FSE_decompress_wksp_body_bmi2(dst, dstCapacity, cSrc, cSrcSize, maxLog, workSpace, wkspSize); + } +#endif + (void)bmi2; + return FSE_decompress_wksp_body_default(dst, dstCapacity, cSrc, cSrcSize, maxLog, workSpace, wkspSize); +} + + +typedef FSE_DTable DTable_max_t[FSE_DTABLE_SIZE_U32(FSE_MAX_TABLELOG)]; + +#ifndef ZSTD_NO_UNUSED_FUNCTIONS +size_t FSE_buildDTable(FSE_DTable* dt, const short* normalizedCounter, unsigned maxSymbolValue, unsigned tableLog) { + U32 wksp[FSE_BUILD_DTABLE_WKSP_SIZE_U32(FSE_TABLELOG_ABSOLUTE_MAX, FSE_MAX_SYMBOL_VALUE)]; + return FSE_buildDTable_wksp(dt, normalizedCounter, maxSymbolValue, tableLog, wksp, sizeof(wksp)); +} + +size_t FSE_decompress(void* dst, size_t dstCapacity, const void* cSrc, size_t cSrcSize) +{ + /* Static analyzer seems unable to understand this table will be properly initialized later */ + U32 wksp[FSE_DECOMPRESS_WKSP_SIZE_U32(FSE_MAX_TABLELOG, FSE_MAX_SYMBOL_VALUE)]; + return FSE_decompress_wksp(dst, dstCapacity, cSrc, cSrcSize, FSE_MAX_TABLELOG, wksp, sizeof(wksp)); +} +#endif + + +#endif /* FSE_COMMONDEFS_ONLY */ diff --git a/external/zstd/lib/common/huf.h b/external/zstd/lib/common/huf.h new file mode 100644 index 00000000..3d47ced0 --- /dev/null +++ b/external/zstd/lib/common/huf.h @@ -0,0 +1,362 @@ +/* ****************************************************************** + * huff0 huffman codec, + * part of Finite State Entropy library + * Copyright (c) Yann Collet, Facebook, Inc. + * + * You can contact the author at : + * - Source repository : https://github.com/Cyan4973/FiniteStateEntropy + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. +****************************************************************** */ + +#if defined (__cplusplus) +extern "C" { +#endif + +#ifndef HUF_H_298734234 +#define HUF_H_298734234 + +/* *** Dependencies *** */ +#include "zstd_deps.h" /* size_t */ + + +/* *** library symbols visibility *** */ +/* Note : when linking with -fvisibility=hidden on gcc, or by default on Visual, + * HUF symbols remain "private" (internal symbols for library only). + * Set macro FSE_DLL_EXPORT to 1 if you want HUF symbols visible on DLL interface */ +#if defined(FSE_DLL_EXPORT) && (FSE_DLL_EXPORT==1) && defined(__GNUC__) && (__GNUC__ >= 4) +# define HUF_PUBLIC_API __attribute__ ((visibility ("default"))) +#elif defined(FSE_DLL_EXPORT) && (FSE_DLL_EXPORT==1) /* Visual expected */ +# define HUF_PUBLIC_API __declspec(dllexport) +#elif defined(FSE_DLL_IMPORT) && (FSE_DLL_IMPORT==1) +# define HUF_PUBLIC_API __declspec(dllimport) /* not required, just to generate faster code (saves a function pointer load from IAT and an indirect jump) */ +#else +# define HUF_PUBLIC_API +#endif + + +/* ========================== */ +/* *** simple functions *** */ +/* ========================== */ + +/** HUF_compress() : + * Compress content from buffer 'src', of size 'srcSize', into buffer 'dst'. + * 'dst' buffer must be already allocated. + * Compression runs faster if `dstCapacity` >= HUF_compressBound(srcSize). + * `srcSize` must be <= `HUF_BLOCKSIZE_MAX` == 128 KB. + * @return : size of compressed data (<= `dstCapacity`). + * Special values : if return == 0, srcData is not compressible => Nothing is stored within dst !!! + * if HUF_isError(return), compression failed (more details using HUF_getErrorName()) + */ +HUF_PUBLIC_API size_t HUF_compress(void* dst, size_t dstCapacity, + const void* src, size_t srcSize); + +/** HUF_decompress() : + * Decompress HUF data from buffer 'cSrc', of size 'cSrcSize', + * into already allocated buffer 'dst', of minimum size 'dstSize'. + * `originalSize` : **must** be the ***exact*** size of original (uncompressed) data. + * Note : in contrast with FSE, HUF_decompress can regenerate + * RLE (cSrcSize==1) and uncompressed (cSrcSize==dstSize) data, + * because it knows size to regenerate (originalSize). + * @return : size of regenerated data (== originalSize), + * or an error code, which can be tested using HUF_isError() + */ +HUF_PUBLIC_API size_t HUF_decompress(void* dst, size_t originalSize, + const void* cSrc, size_t cSrcSize); + + +/* *** Tool functions *** */ +#define HUF_BLOCKSIZE_MAX (128 * 1024) /**< maximum input size for a single block compressed with HUF_compress */ +HUF_PUBLIC_API size_t HUF_compressBound(size_t size); /**< maximum compressed size (worst case) */ + +/* Error Management */ +HUF_PUBLIC_API unsigned HUF_isError(size_t code); /**< tells if a return value is an error code */ +HUF_PUBLIC_API const char* HUF_getErrorName(size_t code); /**< provides error code string (useful for debugging) */ + + +/* *** Advanced function *** */ + +/** HUF_compress2() : + * Same as HUF_compress(), but offers control over `maxSymbolValue` and `tableLog`. + * `maxSymbolValue` must be <= HUF_SYMBOLVALUE_MAX . + * `tableLog` must be `<= HUF_TABLELOG_MAX` . */ +HUF_PUBLIC_API size_t HUF_compress2 (void* dst, size_t dstCapacity, + const void* src, size_t srcSize, + unsigned maxSymbolValue, unsigned tableLog); + +/** HUF_compress4X_wksp() : + * Same as HUF_compress2(), but uses externally allocated `workSpace`. + * `workspace` must have minimum alignment of 4, and be at least as large as HUF_WORKSPACE_SIZE */ +#define HUF_WORKSPACE_SIZE ((6 << 10) + 256) +#define HUF_WORKSPACE_SIZE_U32 (HUF_WORKSPACE_SIZE / sizeof(U32)) +HUF_PUBLIC_API size_t HUF_compress4X_wksp (void* dst, size_t dstCapacity, + const void* src, size_t srcSize, + unsigned maxSymbolValue, unsigned tableLog, + void* workSpace, size_t wkspSize); + +#endif /* HUF_H_298734234 */ + +/* ****************************************************************** + * WARNING !! + * The following section contains advanced and experimental definitions + * which shall never be used in the context of a dynamic library, + * because they are not guaranteed to remain stable in the future. + * Only consider them in association with static linking. + * *****************************************************************/ +#if defined(HUF_STATIC_LINKING_ONLY) && !defined(HUF_H_HUF_STATIC_LINKING_ONLY) +#define HUF_H_HUF_STATIC_LINKING_ONLY + +/* *** Dependencies *** */ +#include "mem.h" /* U32 */ +#define FSE_STATIC_LINKING_ONLY +#include "fse.h" + + +/* *** Constants *** */ +#define HUF_TABLELOG_MAX 12 /* max runtime value of tableLog (due to static allocation); can be modified up to HUF_ABSOLUTEMAX_TABLELOG */ +#define HUF_TABLELOG_DEFAULT 11 /* default tableLog value when none specified */ +#define HUF_SYMBOLVALUE_MAX 255 + +#define HUF_TABLELOG_ABSOLUTEMAX 15 /* absolute limit of HUF_MAX_TABLELOG. Beyond that value, code does not work */ +#if (HUF_TABLELOG_MAX > HUF_TABLELOG_ABSOLUTEMAX) +# error "HUF_TABLELOG_MAX is too large !" +#endif + + +/* **************************************** +* Static allocation +******************************************/ +/* HUF buffer bounds */ +#define HUF_CTABLEBOUND 129 +#define HUF_BLOCKBOUND(size) (size + (size>>8) + 8) /* only true when incompressible is pre-filtered with fast heuristic */ +#define HUF_COMPRESSBOUND(size) (HUF_CTABLEBOUND + HUF_BLOCKBOUND(size)) /* Macro version, useful for static allocation */ + +/* static allocation of HUF's Compression Table */ +/* this is a private definition, just exposed for allocation and strict aliasing purpose. never EVER access its members directly */ +struct HUF_CElt_s { + U16 val; + BYTE nbBits; +}; /* typedef'd to HUF_CElt */ +typedef struct HUF_CElt_s HUF_CElt; /* consider it an incomplete type */ +#define HUF_CTABLE_SIZE_U32(maxSymbolValue) ((maxSymbolValue)+1) /* Use tables of U32, for proper alignment */ +#define HUF_CTABLE_SIZE(maxSymbolValue) (HUF_CTABLE_SIZE_U32(maxSymbolValue) * sizeof(U32)) +#define HUF_CREATE_STATIC_CTABLE(name, maxSymbolValue) \ + HUF_CElt name[HUF_CTABLE_SIZE_U32(maxSymbolValue)] /* no final ; */ + +/* static allocation of HUF's DTable */ +typedef U32 HUF_DTable; +#define HUF_DTABLE_SIZE(maxTableLog) (1 + (1<<(maxTableLog))) +#define HUF_CREATE_STATIC_DTABLEX1(DTable, maxTableLog) \ + HUF_DTable DTable[HUF_DTABLE_SIZE((maxTableLog)-1)] = { ((U32)((maxTableLog)-1) * 0x01000001) } +#define HUF_CREATE_STATIC_DTABLEX2(DTable, maxTableLog) \ + HUF_DTable DTable[HUF_DTABLE_SIZE(maxTableLog)] = { ((U32)(maxTableLog) * 0x01000001) } + + +/* **************************************** +* Advanced decompression functions +******************************************/ +size_t HUF_decompress4X1 (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); /**< single-symbol decoder */ +#ifndef HUF_FORCE_DECOMPRESS_X1 +size_t HUF_decompress4X2 (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); /**< double-symbols decoder */ +#endif + +size_t HUF_decompress4X_DCtx (HUF_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); /**< decodes RLE and uncompressed */ +size_t HUF_decompress4X_hufOnly(HUF_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); /**< considers RLE and uncompressed as errors */ +size_t HUF_decompress4X_hufOnly_wksp(HUF_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize, void* workSpace, size_t wkspSize); /**< considers RLE and uncompressed as errors */ +size_t HUF_decompress4X1_DCtx(HUF_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); /**< single-symbol decoder */ +size_t HUF_decompress4X1_DCtx_wksp(HUF_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize, void* workSpace, size_t wkspSize); /**< single-symbol decoder */ +#ifndef HUF_FORCE_DECOMPRESS_X1 +size_t HUF_decompress4X2_DCtx(HUF_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); /**< double-symbols decoder */ +size_t HUF_decompress4X2_DCtx_wksp(HUF_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize, void* workSpace, size_t wkspSize); /**< double-symbols decoder */ +#endif + + +/* **************************************** + * HUF detailed API + * ****************************************/ + +/*! HUF_compress() does the following: + * 1. count symbol occurrence from source[] into table count[] using FSE_count() (exposed within "fse.h") + * 2. (optional) refine tableLog using HUF_optimalTableLog() + * 3. build Huffman table from count using HUF_buildCTable() + * 4. save Huffman table to memory buffer using HUF_writeCTable() + * 5. encode the data stream using HUF_compress4X_usingCTable() + * + * The following API allows targeting specific sub-functions for advanced tasks. + * For example, it's possible to compress several blocks using the same 'CTable', + * or to save and regenerate 'CTable' using external methods. + */ +unsigned HUF_optimalTableLog(unsigned maxTableLog, size_t srcSize, unsigned maxSymbolValue); +size_t HUF_buildCTable (HUF_CElt* CTable, const unsigned* count, unsigned maxSymbolValue, unsigned maxNbBits); /* @return : maxNbBits; CTable and count can overlap. In which case, CTable will overwrite count content */ +size_t HUF_writeCTable (void* dst, size_t maxDstSize, const HUF_CElt* CTable, unsigned maxSymbolValue, unsigned huffLog); +size_t HUF_writeCTable_wksp(void* dst, size_t maxDstSize, const HUF_CElt* CTable, unsigned maxSymbolValue, unsigned huffLog, void* workspace, size_t workspaceSize); +size_t HUF_compress4X_usingCTable(void* dst, size_t dstSize, const void* src, size_t srcSize, const HUF_CElt* CTable); +size_t HUF_estimateCompressedSize(const HUF_CElt* CTable, const unsigned* count, unsigned maxSymbolValue); +int HUF_validateCTable(const HUF_CElt* CTable, const unsigned* count, unsigned maxSymbolValue); + +typedef enum { + HUF_repeat_none, /**< Cannot use the previous table */ + HUF_repeat_check, /**< Can use the previous table but it must be checked. Note : The previous table must have been constructed by HUF_compress{1, 4}X_repeat */ + HUF_repeat_valid /**< Can use the previous table and it is assumed to be valid */ + } HUF_repeat; +/** HUF_compress4X_repeat() : + * Same as HUF_compress4X_wksp(), but considers using hufTable if *repeat != HUF_repeat_none. + * If it uses hufTable it does not modify hufTable or repeat. + * If it doesn't, it sets *repeat = HUF_repeat_none, and it sets hufTable to the table used. + * If preferRepeat then the old table will always be used if valid. */ +size_t HUF_compress4X_repeat(void* dst, size_t dstSize, + const void* src, size_t srcSize, + unsigned maxSymbolValue, unsigned tableLog, + void* workSpace, size_t wkspSize, /**< `workSpace` must be aligned on 4-bytes boundaries, `wkspSize` must be >= HUF_WORKSPACE_SIZE */ + HUF_CElt* hufTable, HUF_repeat* repeat, int preferRepeat, int bmi2); + +/** HUF_buildCTable_wksp() : + * Same as HUF_buildCTable(), but using externally allocated scratch buffer. + * `workSpace` must be aligned on 4-bytes boundaries, and its size must be >= HUF_CTABLE_WORKSPACE_SIZE. + */ +#define HUF_CTABLE_WORKSPACE_SIZE_U32 (2*HUF_SYMBOLVALUE_MAX +1 +1) +#define HUF_CTABLE_WORKSPACE_SIZE (HUF_CTABLE_WORKSPACE_SIZE_U32 * sizeof(unsigned)) +size_t HUF_buildCTable_wksp (HUF_CElt* tree, + const unsigned* count, U32 maxSymbolValue, U32 maxNbBits, + void* workSpace, size_t wkspSize); + +/*! HUF_readStats() : + * Read compact Huffman tree, saved by HUF_writeCTable(). + * `huffWeight` is destination buffer. + * @return : size read from `src` , or an error Code . + * Note : Needed by HUF_readCTable() and HUF_readDTableXn() . */ +size_t HUF_readStats(BYTE* huffWeight, size_t hwSize, + U32* rankStats, U32* nbSymbolsPtr, U32* tableLogPtr, + const void* src, size_t srcSize); + +/*! HUF_readStats_wksp() : + * Same as HUF_readStats() but takes an external workspace which must be + * 4-byte aligned and its size must be >= HUF_READ_STATS_WORKSPACE_SIZE. + * If the CPU has BMI2 support, pass bmi2=1, otherwise pass bmi2=0. + */ +#define HUF_READ_STATS_WORKSPACE_SIZE_U32 FSE_DECOMPRESS_WKSP_SIZE_U32(6, HUF_TABLELOG_MAX-1) +#define HUF_READ_STATS_WORKSPACE_SIZE (HUF_READ_STATS_WORKSPACE_SIZE_U32 * sizeof(unsigned)) +size_t HUF_readStats_wksp(BYTE* huffWeight, size_t hwSize, + U32* rankStats, U32* nbSymbolsPtr, U32* tableLogPtr, + const void* src, size_t srcSize, + void* workspace, size_t wkspSize, + int bmi2); + +/** HUF_readCTable() : + * Loading a CTable saved with HUF_writeCTable() */ +size_t HUF_readCTable (HUF_CElt* CTable, unsigned* maxSymbolValuePtr, const void* src, size_t srcSize, unsigned *hasZeroWeights); + +/** HUF_getNbBits() : + * Read nbBits from CTable symbolTable, for symbol `symbolValue` presumed <= HUF_SYMBOLVALUE_MAX + * Note 1 : is not inlined, as HUF_CElt definition is private + * Note 2 : const void* used, so that it can provide a statically allocated table as argument (which uses type U32) */ +U32 HUF_getNbBits(const void* symbolTable, U32 symbolValue); + +/* + * HUF_decompress() does the following: + * 1. select the decompression algorithm (X1, X2) based on pre-computed heuristics + * 2. build Huffman table from save, using HUF_readDTableX?() + * 3. decode 1 or 4 segments in parallel using HUF_decompress?X?_usingDTable() + */ + +/** HUF_selectDecoder() : + * Tells which decoder is likely to decode faster, + * based on a set of pre-computed metrics. + * @return : 0==HUF_decompress4X1, 1==HUF_decompress4X2 . + * Assumption : 0 < dstSize <= 128 KB */ +U32 HUF_selectDecoder (size_t dstSize, size_t cSrcSize); + +/** + * The minimum workspace size for the `workSpace` used in + * HUF_readDTableX1_wksp() and HUF_readDTableX2_wksp(). + * + * The space used depends on HUF_TABLELOG_MAX, ranging from ~1500 bytes when + * HUF_TABLE_LOG_MAX=12 to ~1850 bytes when HUF_TABLE_LOG_MAX=15. + * Buffer overflow errors may potentially occur if code modifications result in + * a required workspace size greater than that specified in the following + * macro. + */ +#define HUF_DECOMPRESS_WORKSPACE_SIZE ((2 << 10) + (1 << 9)) +#define HUF_DECOMPRESS_WORKSPACE_SIZE_U32 (HUF_DECOMPRESS_WORKSPACE_SIZE / sizeof(U32)) + +#ifndef HUF_FORCE_DECOMPRESS_X2 +size_t HUF_readDTableX1 (HUF_DTable* DTable, const void* src, size_t srcSize); +size_t HUF_readDTableX1_wksp (HUF_DTable* DTable, const void* src, size_t srcSize, void* workSpace, size_t wkspSize); +#endif +#ifndef HUF_FORCE_DECOMPRESS_X1 +size_t HUF_readDTableX2 (HUF_DTable* DTable, const void* src, size_t srcSize); +size_t HUF_readDTableX2_wksp (HUF_DTable* DTable, const void* src, size_t srcSize, void* workSpace, size_t wkspSize); +#endif + +size_t HUF_decompress4X_usingDTable(void* dst, size_t maxDstSize, const void* cSrc, size_t cSrcSize, const HUF_DTable* DTable); +#ifndef HUF_FORCE_DECOMPRESS_X2 +size_t HUF_decompress4X1_usingDTable(void* dst, size_t maxDstSize, const void* cSrc, size_t cSrcSize, const HUF_DTable* DTable); +#endif +#ifndef HUF_FORCE_DECOMPRESS_X1 +size_t HUF_decompress4X2_usingDTable(void* dst, size_t maxDstSize, const void* cSrc, size_t cSrcSize, const HUF_DTable* DTable); +#endif + + +/* ====================== */ +/* single stream variants */ +/* ====================== */ + +size_t HUF_compress1X (void* dst, size_t dstSize, const void* src, size_t srcSize, unsigned maxSymbolValue, unsigned tableLog); +size_t HUF_compress1X_wksp (void* dst, size_t dstSize, const void* src, size_t srcSize, unsigned maxSymbolValue, unsigned tableLog, void* workSpace, size_t wkspSize); /**< `workSpace` must be a table of at least HUF_WORKSPACE_SIZE_U32 unsigned */ +size_t HUF_compress1X_usingCTable(void* dst, size_t dstSize, const void* src, size_t srcSize, const HUF_CElt* CTable); +/** HUF_compress1X_repeat() : + * Same as HUF_compress1X_wksp(), but considers using hufTable if *repeat != HUF_repeat_none. + * If it uses hufTable it does not modify hufTable or repeat. + * If it doesn't, it sets *repeat = HUF_repeat_none, and it sets hufTable to the table used. + * If preferRepeat then the old table will always be used if valid. */ +size_t HUF_compress1X_repeat(void* dst, size_t dstSize, + const void* src, size_t srcSize, + unsigned maxSymbolValue, unsigned tableLog, + void* workSpace, size_t wkspSize, /**< `workSpace` must be aligned on 4-bytes boundaries, `wkspSize` must be >= HUF_WORKSPACE_SIZE */ + HUF_CElt* hufTable, HUF_repeat* repeat, int preferRepeat, int bmi2); + +size_t HUF_decompress1X1 (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); /* single-symbol decoder */ +#ifndef HUF_FORCE_DECOMPRESS_X1 +size_t HUF_decompress1X2 (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); /* double-symbol decoder */ +#endif + +size_t HUF_decompress1X_DCtx (HUF_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); +size_t HUF_decompress1X_DCtx_wksp (HUF_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize, void* workSpace, size_t wkspSize); +#ifndef HUF_FORCE_DECOMPRESS_X2 +size_t HUF_decompress1X1_DCtx(HUF_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); /**< single-symbol decoder */ +size_t HUF_decompress1X1_DCtx_wksp(HUF_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize, void* workSpace, size_t wkspSize); /**< single-symbol decoder */ +#endif +#ifndef HUF_FORCE_DECOMPRESS_X1 +size_t HUF_decompress1X2_DCtx(HUF_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); /**< double-symbols decoder */ +size_t HUF_decompress1X2_DCtx_wksp(HUF_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize, void* workSpace, size_t wkspSize); /**< double-symbols decoder */ +#endif + +size_t HUF_decompress1X_usingDTable(void* dst, size_t maxDstSize, const void* cSrc, size_t cSrcSize, const HUF_DTable* DTable); /**< automatic selection of sing or double symbol decoder, based on DTable */ +#ifndef HUF_FORCE_DECOMPRESS_X2 +size_t HUF_decompress1X1_usingDTable(void* dst, size_t maxDstSize, const void* cSrc, size_t cSrcSize, const HUF_DTable* DTable); +#endif +#ifndef HUF_FORCE_DECOMPRESS_X1 +size_t HUF_decompress1X2_usingDTable(void* dst, size_t maxDstSize, const void* cSrc, size_t cSrcSize, const HUF_DTable* DTable); +#endif + +/* BMI2 variants. + * If the CPU has BMI2 support, pass bmi2=1, otherwise pass bmi2=0. + */ +size_t HUF_decompress1X_usingDTable_bmi2(void* dst, size_t maxDstSize, const void* cSrc, size_t cSrcSize, const HUF_DTable* DTable, int bmi2); +#ifndef HUF_FORCE_DECOMPRESS_X2 +size_t HUF_decompress1X1_DCtx_wksp_bmi2(HUF_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize, void* workSpace, size_t wkspSize, int bmi2); +#endif +size_t HUF_decompress4X_usingDTable_bmi2(void* dst, size_t maxDstSize, const void* cSrc, size_t cSrcSize, const HUF_DTable* DTable, int bmi2); +size_t HUF_decompress4X_hufOnly_wksp_bmi2(HUF_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize, void* workSpace, size_t wkspSize, int bmi2); +#ifndef HUF_FORCE_DECOMPRESS_X2 +size_t HUF_readDTableX1_wksp_bmi2(HUF_DTable* DTable, const void* src, size_t srcSize, void* workSpace, size_t wkspSize, int bmi2); +#endif + +#endif /* HUF_STATIC_LINKING_ONLY */ + +#if defined (__cplusplus) +} +#endif diff --git a/external/zstd/lib/common/mem.h b/external/zstd/lib/common/mem.h new file mode 100644 index 00000000..9f3b81ab --- /dev/null +++ b/external/zstd/lib/common/mem.h @@ -0,0 +1,424 @@ +/* + * Copyright (c) Yann Collet, Facebook, Inc. + * All rights reserved. + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. + */ + +#ifndef MEM_H_MODULE +#define MEM_H_MODULE + +#if defined (__cplusplus) +extern "C" { +#endif + +/*-**************************************** +* Dependencies +******************************************/ +#include /* size_t, ptrdiff_t */ +#include "compiler.h" /* __has_builtin */ +#include "debug.h" /* DEBUG_STATIC_ASSERT */ +#include "zstd_deps.h" /* ZSTD_memcpy */ + + +/*-**************************************** +* Compiler specifics +******************************************/ +#if defined(_MSC_VER) /* Visual Studio */ +# include /* _byteswap_ulong */ +# include /* _byteswap_* */ +#endif +#if defined(__GNUC__) +# define MEM_STATIC static __inline __attribute__((unused)) +#elif defined (__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */) +# define MEM_STATIC static inline +#elif defined(_MSC_VER) +# define MEM_STATIC static __inline +#else +# define MEM_STATIC static /* this version may generate warnings for unused static functions; disable the relevant warning */ +#endif + +/*-************************************************************** +* Basic Types +*****************************************************************/ +#if !defined (__VMS) && (defined (__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */) ) +# if defined(_AIX) +# include +# else +# include /* intptr_t */ +# endif + typedef uint8_t BYTE; + typedef uint16_t U16; + typedef int16_t S16; + typedef uint32_t U32; + typedef int32_t S32; + typedef uint64_t U64; + typedef int64_t S64; +#else +# include +#if CHAR_BIT != 8 +# error "this implementation requires char to be exactly 8-bit type" +#endif + typedef unsigned char BYTE; +#if USHRT_MAX != 65535 +# error "this implementation requires short to be exactly 16-bit type" +#endif + typedef unsigned short U16; + typedef signed short S16; +#if UINT_MAX != 4294967295 +# error "this implementation requires int to be exactly 32-bit type" +#endif + typedef unsigned int U32; + typedef signed int S32; +/* note : there are no limits defined for long long type in C90. + * limits exist in C99, however, in such case, is preferred */ + typedef unsigned long long U64; + typedef signed long long S64; +#endif + + +/*-************************************************************** +* Memory I/O API +*****************************************************************/ +/*=== Static platform detection ===*/ +MEM_STATIC unsigned MEM_32bits(void); +MEM_STATIC unsigned MEM_64bits(void); +MEM_STATIC unsigned MEM_isLittleEndian(void); + +/*=== Native unaligned read/write ===*/ +MEM_STATIC U16 MEM_read16(const void* memPtr); +MEM_STATIC U32 MEM_read32(const void* memPtr); +MEM_STATIC U64 MEM_read64(const void* memPtr); +MEM_STATIC size_t MEM_readST(const void* memPtr); + +MEM_STATIC void MEM_write16(void* memPtr, U16 value); +MEM_STATIC void MEM_write32(void* memPtr, U32 value); +MEM_STATIC void MEM_write64(void* memPtr, U64 value); + +/*=== Little endian unaligned read/write ===*/ +MEM_STATIC U16 MEM_readLE16(const void* memPtr); +MEM_STATIC U32 MEM_readLE24(const void* memPtr); +MEM_STATIC U32 MEM_readLE32(const void* memPtr); +MEM_STATIC U64 MEM_readLE64(const void* memPtr); +MEM_STATIC size_t MEM_readLEST(const void* memPtr); + +MEM_STATIC void MEM_writeLE16(void* memPtr, U16 val); +MEM_STATIC void MEM_writeLE24(void* memPtr, U32 val); +MEM_STATIC void MEM_writeLE32(void* memPtr, U32 val32); +MEM_STATIC void MEM_writeLE64(void* memPtr, U64 val64); +MEM_STATIC void MEM_writeLEST(void* memPtr, size_t val); + +/*=== Big endian unaligned read/write ===*/ +MEM_STATIC U32 MEM_readBE32(const void* memPtr); +MEM_STATIC U64 MEM_readBE64(const void* memPtr); +MEM_STATIC size_t MEM_readBEST(const void* memPtr); + +MEM_STATIC void MEM_writeBE32(void* memPtr, U32 val32); +MEM_STATIC void MEM_writeBE64(void* memPtr, U64 val64); +MEM_STATIC void MEM_writeBEST(void* memPtr, size_t val); + +/*=== Byteswap ===*/ +MEM_STATIC U32 MEM_swap32(U32 in); +MEM_STATIC U64 MEM_swap64(U64 in); +MEM_STATIC size_t MEM_swapST(size_t in); + + +/*-************************************************************** +* Memory I/O Implementation +*****************************************************************/ +/* MEM_FORCE_MEMORY_ACCESS : + * By default, access to unaligned memory is controlled by `memcpy()`, which is safe and portable. + * Unfortunately, on some target/compiler combinations, the generated assembly is sub-optimal. + * The below switch allow to select different access method for improved performance. + * Method 0 (default) : use `memcpy()`. Safe and portable. + * Method 1 : `__packed` statement. It depends on compiler extension (i.e., not portable). + * This method is safe if your compiler supports it, and *generally* as fast or faster than `memcpy`. + * Method 2 : direct access. This method is portable but violate C standard. + * It can generate buggy code on targets depending on alignment. + * In some circumstances, it's the only known way to get the most performance (i.e. GCC + ARMv6) + * See http://fastcompression.blogspot.fr/2015/08/accessing-unaligned-memory.html for details. + * Prefer these methods in priority order (0 > 1 > 2) + */ +#ifndef MEM_FORCE_MEMORY_ACCESS /* can be defined externally, on command line for example */ +# if defined(__INTEL_COMPILER) || defined(__GNUC__) || defined(__ICCARM__) +# define MEM_FORCE_MEMORY_ACCESS 1 +# endif +#endif + +MEM_STATIC unsigned MEM_32bits(void) { return sizeof(size_t)==4; } +MEM_STATIC unsigned MEM_64bits(void) { return sizeof(size_t)==8; } + +MEM_STATIC unsigned MEM_isLittleEndian(void) +{ + const union { U32 u; BYTE c[4]; } one = { 1 }; /* don't use static : performance detrimental */ + return one.c[0]; +} + +#if defined(MEM_FORCE_MEMORY_ACCESS) && (MEM_FORCE_MEMORY_ACCESS==2) + +/* violates C standard, by lying on structure alignment. +Only use if no other choice to achieve best performance on target platform */ +MEM_STATIC U16 MEM_read16(const void* memPtr) { return *(const U16*) memPtr; } +MEM_STATIC U32 MEM_read32(const void* memPtr) { return *(const U32*) memPtr; } +MEM_STATIC U64 MEM_read64(const void* memPtr) { return *(const U64*) memPtr; } +MEM_STATIC size_t MEM_readST(const void* memPtr) { return *(const size_t*) memPtr; } + +MEM_STATIC void MEM_write16(void* memPtr, U16 value) { *(U16*)memPtr = value; } +MEM_STATIC void MEM_write32(void* memPtr, U32 value) { *(U32*)memPtr = value; } +MEM_STATIC void MEM_write64(void* memPtr, U64 value) { *(U64*)memPtr = value; } + +#elif defined(MEM_FORCE_MEMORY_ACCESS) && (MEM_FORCE_MEMORY_ACCESS==1) + +/* __pack instructions are safer, but compiler specific, hence potentially problematic for some compilers */ +/* currently only defined for gcc and icc */ +#if defined(_MSC_VER) || (defined(__INTEL_COMPILER) && defined(WIN32)) + __pragma( pack(push, 1) ) + typedef struct { U16 v; } unalign16; + typedef struct { U32 v; } unalign32; + typedef struct { U64 v; } unalign64; + typedef struct { size_t v; } unalignArch; + __pragma( pack(pop) ) +#else + typedef struct { U16 v; } __attribute__((packed)) unalign16; + typedef struct { U32 v; } __attribute__((packed)) unalign32; + typedef struct { U64 v; } __attribute__((packed)) unalign64; + typedef struct { size_t v; } __attribute__((packed)) unalignArch; +#endif + +MEM_STATIC U16 MEM_read16(const void* ptr) { return ((const unalign16*)ptr)->v; } +MEM_STATIC U32 MEM_read32(const void* ptr) { return ((const unalign32*)ptr)->v; } +MEM_STATIC U64 MEM_read64(const void* ptr) { return ((const unalign64*)ptr)->v; } +MEM_STATIC size_t MEM_readST(const void* ptr) { return ((const unalignArch*)ptr)->v; } + +MEM_STATIC void MEM_write16(void* memPtr, U16 value) { ((unalign16*)memPtr)->v = value; } +MEM_STATIC void MEM_write32(void* memPtr, U32 value) { ((unalign32*)memPtr)->v = value; } +MEM_STATIC void MEM_write64(void* memPtr, U64 value) { ((unalign64*)memPtr)->v = value; } + +#else + +/* default method, safe and standard. + can sometimes prove slower */ + +MEM_STATIC U16 MEM_read16(const void* memPtr) +{ + U16 val; ZSTD_memcpy(&val, memPtr, sizeof(val)); return val; +} + +MEM_STATIC U32 MEM_read32(const void* memPtr) +{ + U32 val; ZSTD_memcpy(&val, memPtr, sizeof(val)); return val; +} + +MEM_STATIC U64 MEM_read64(const void* memPtr) +{ + U64 val; ZSTD_memcpy(&val, memPtr, sizeof(val)); return val; +} + +MEM_STATIC size_t MEM_readST(const void* memPtr) +{ + size_t val; ZSTD_memcpy(&val, memPtr, sizeof(val)); return val; +} + +MEM_STATIC void MEM_write16(void* memPtr, U16 value) +{ + ZSTD_memcpy(memPtr, &value, sizeof(value)); +} + +MEM_STATIC void MEM_write32(void* memPtr, U32 value) +{ + ZSTD_memcpy(memPtr, &value, sizeof(value)); +} + +MEM_STATIC void MEM_write64(void* memPtr, U64 value) +{ + ZSTD_memcpy(memPtr, &value, sizeof(value)); +} + +#endif /* MEM_FORCE_MEMORY_ACCESS */ + +MEM_STATIC U32 MEM_swap32(U32 in) +{ +#if defined(_MSC_VER) /* Visual Studio */ + return _byteswap_ulong(in); +#elif (defined (__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__ >= 403)) \ + || (defined(__clang__) && __has_builtin(__builtin_bswap32)) + return __builtin_bswap32(in); +#else + return ((in << 24) & 0xff000000 ) | + ((in << 8) & 0x00ff0000 ) | + ((in >> 8) & 0x0000ff00 ) | + ((in >> 24) & 0x000000ff ); +#endif +} + +MEM_STATIC U64 MEM_swap64(U64 in) +{ +#if defined(_MSC_VER) /* Visual Studio */ + return _byteswap_uint64(in); +#elif (defined (__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__ >= 403)) \ + || (defined(__clang__) && __has_builtin(__builtin_bswap64)) + return __builtin_bswap64(in); +#else + return ((in << 56) & 0xff00000000000000ULL) | + ((in << 40) & 0x00ff000000000000ULL) | + ((in << 24) & 0x0000ff0000000000ULL) | + ((in << 8) & 0x000000ff00000000ULL) | + ((in >> 8) & 0x00000000ff000000ULL) | + ((in >> 24) & 0x0000000000ff0000ULL) | + ((in >> 40) & 0x000000000000ff00ULL) | + ((in >> 56) & 0x00000000000000ffULL); +#endif +} + +MEM_STATIC size_t MEM_swapST(size_t in) +{ + if (MEM_32bits()) + return (size_t)MEM_swap32((U32)in); + else + return (size_t)MEM_swap64((U64)in); +} + +/*=== Little endian r/w ===*/ + +MEM_STATIC U16 MEM_readLE16(const void* memPtr) +{ + if (MEM_isLittleEndian()) + return MEM_read16(memPtr); + else { + const BYTE* p = (const BYTE*)memPtr; + return (U16)(p[0] + (p[1]<<8)); + } +} + +MEM_STATIC void MEM_writeLE16(void* memPtr, U16 val) +{ + if (MEM_isLittleEndian()) { + MEM_write16(memPtr, val); + } else { + BYTE* p = (BYTE*)memPtr; + p[0] = (BYTE)val; + p[1] = (BYTE)(val>>8); + } +} + +MEM_STATIC U32 MEM_readLE24(const void* memPtr) +{ + return (U32)MEM_readLE16(memPtr) + ((U32)(((const BYTE*)memPtr)[2]) << 16); +} + +MEM_STATIC void MEM_writeLE24(void* memPtr, U32 val) +{ + MEM_writeLE16(memPtr, (U16)val); + ((BYTE*)memPtr)[2] = (BYTE)(val>>16); +} + +MEM_STATIC U32 MEM_readLE32(const void* memPtr) +{ + if (MEM_isLittleEndian()) + return MEM_read32(memPtr); + else + return MEM_swap32(MEM_read32(memPtr)); +} + +MEM_STATIC void MEM_writeLE32(void* memPtr, U32 val32) +{ + if (MEM_isLittleEndian()) + MEM_write32(memPtr, val32); + else + MEM_write32(memPtr, MEM_swap32(val32)); +} + +MEM_STATIC U64 MEM_readLE64(const void* memPtr) +{ + if (MEM_isLittleEndian()) + return MEM_read64(memPtr); + else + return MEM_swap64(MEM_read64(memPtr)); +} + +MEM_STATIC void MEM_writeLE64(void* memPtr, U64 val64) +{ + if (MEM_isLittleEndian()) + MEM_write64(memPtr, val64); + else + MEM_write64(memPtr, MEM_swap64(val64)); +} + +MEM_STATIC size_t MEM_readLEST(const void* memPtr) +{ + if (MEM_32bits()) + return (size_t)MEM_readLE32(memPtr); + else + return (size_t)MEM_readLE64(memPtr); +} + +MEM_STATIC void MEM_writeLEST(void* memPtr, size_t val) +{ + if (MEM_32bits()) + MEM_writeLE32(memPtr, (U32)val); + else + MEM_writeLE64(memPtr, (U64)val); +} + +/*=== Big endian r/w ===*/ + +MEM_STATIC U32 MEM_readBE32(const void* memPtr) +{ + if (MEM_isLittleEndian()) + return MEM_swap32(MEM_read32(memPtr)); + else + return MEM_read32(memPtr); +} + +MEM_STATIC void MEM_writeBE32(void* memPtr, U32 val32) +{ + if (MEM_isLittleEndian()) + MEM_write32(memPtr, MEM_swap32(val32)); + else + MEM_write32(memPtr, val32); +} + +MEM_STATIC U64 MEM_readBE64(const void* memPtr) +{ + if (MEM_isLittleEndian()) + return MEM_swap64(MEM_read64(memPtr)); + else + return MEM_read64(memPtr); +} + +MEM_STATIC void MEM_writeBE64(void* memPtr, U64 val64) +{ + if (MEM_isLittleEndian()) + MEM_write64(memPtr, MEM_swap64(val64)); + else + MEM_write64(memPtr, val64); +} + +MEM_STATIC size_t MEM_readBEST(const void* memPtr) +{ + if (MEM_32bits()) + return (size_t)MEM_readBE32(memPtr); + else + return (size_t)MEM_readBE64(memPtr); +} + +MEM_STATIC void MEM_writeBEST(void* memPtr, size_t val) +{ + if (MEM_32bits()) + MEM_writeBE32(memPtr, (U32)val); + else + MEM_writeBE64(memPtr, (U64)val); +} + +/* code only tested on 32 and 64 bits systems */ +MEM_STATIC void MEM_check(void) { DEBUG_STATIC_ASSERT((sizeof(size_t)==4) || (sizeof(size_t)==8)); } + + +#if defined (__cplusplus) +} +#endif + +#endif /* MEM_H_MODULE */ diff --git a/external/zstd/lib/common/pool.c b/external/zstd/lib/common/pool.c new file mode 100644 index 00000000..ea70b8b6 --- /dev/null +++ b/external/zstd/lib/common/pool.c @@ -0,0 +1,350 @@ +/* + * Copyright (c) Yann Collet, Facebook, Inc. + * All rights reserved. + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. + */ + + +/* ====== Dependencies ======= */ +#include "zstd_deps.h" /* size_t */ +#include "debug.h" /* assert */ +#include "zstd_internal.h" /* ZSTD_customMalloc, ZSTD_customFree */ +#include "pool.h" + +/* ====== Compiler specifics ====== */ +#if defined(_MSC_VER) +# pragma warning(disable : 4204) /* disable: C4204: non-constant aggregate initializer */ +#endif + + +#ifdef ZSTD_MULTITHREAD + +#include "threading.h" /* pthread adaptation */ + +/* A job is a function and an opaque argument */ +typedef struct POOL_job_s { + POOL_function function; + void *opaque; +} POOL_job; + +struct POOL_ctx_s { + ZSTD_customMem customMem; + /* Keep track of the threads */ + ZSTD_pthread_t* threads; + size_t threadCapacity; + size_t threadLimit; + + /* The queue is a circular buffer */ + POOL_job *queue; + size_t queueHead; + size_t queueTail; + size_t queueSize; + + /* The number of threads working on jobs */ + size_t numThreadsBusy; + /* Indicates if the queue is empty */ + int queueEmpty; + + /* The mutex protects the queue */ + ZSTD_pthread_mutex_t queueMutex; + /* Condition variable for pushers to wait on when the queue is full */ + ZSTD_pthread_cond_t queuePushCond; + /* Condition variables for poppers to wait on when the queue is empty */ + ZSTD_pthread_cond_t queuePopCond; + /* Indicates if the queue is shutting down */ + int shutdown; +}; + +/* POOL_thread() : + * Work thread for the thread pool. + * Waits for jobs and executes them. + * @returns : NULL on failure else non-null. + */ +static void* POOL_thread(void* opaque) { + POOL_ctx* const ctx = (POOL_ctx*)opaque; + if (!ctx) { return NULL; } + for (;;) { + /* Lock the mutex and wait for a non-empty queue or until shutdown */ + ZSTD_pthread_mutex_lock(&ctx->queueMutex); + + while ( ctx->queueEmpty + || (ctx->numThreadsBusy >= ctx->threadLimit) ) { + if (ctx->shutdown) { + /* even if !queueEmpty, (possible if numThreadsBusy >= threadLimit), + * a few threads will be shutdown while !queueEmpty, + * but enough threads will remain active to finish the queue */ + ZSTD_pthread_mutex_unlock(&ctx->queueMutex); + return opaque; + } + ZSTD_pthread_cond_wait(&ctx->queuePopCond, &ctx->queueMutex); + } + /* Pop a job off the queue */ + { POOL_job const job = ctx->queue[ctx->queueHead]; + ctx->queueHead = (ctx->queueHead + 1) % ctx->queueSize; + ctx->numThreadsBusy++; + ctx->queueEmpty = ctx->queueHead == ctx->queueTail; + /* Unlock the mutex, signal a pusher, and run the job */ + ZSTD_pthread_cond_signal(&ctx->queuePushCond); + ZSTD_pthread_mutex_unlock(&ctx->queueMutex); + + job.function(job.opaque); + + /* If the intended queue size was 0, signal after finishing job */ + ZSTD_pthread_mutex_lock(&ctx->queueMutex); + ctx->numThreadsBusy--; + if (ctx->queueSize == 1) { + ZSTD_pthread_cond_signal(&ctx->queuePushCond); + } + ZSTD_pthread_mutex_unlock(&ctx->queueMutex); + } + } /* for (;;) */ + assert(0); /* Unreachable */ +} + +POOL_ctx* ZSTD_createThreadPool(size_t numThreads) { + return POOL_create (numThreads, 0); +} + +POOL_ctx* POOL_create(size_t numThreads, size_t queueSize) { + return POOL_create_advanced(numThreads, queueSize, ZSTD_defaultCMem); +} + +POOL_ctx* POOL_create_advanced(size_t numThreads, size_t queueSize, + ZSTD_customMem customMem) { + POOL_ctx* ctx; + /* Check parameters */ + if (!numThreads) { return NULL; } + /* Allocate the context and zero initialize */ + ctx = (POOL_ctx*)ZSTD_customCalloc(sizeof(POOL_ctx), customMem); + if (!ctx) { return NULL; } + /* Initialize the job queue. + * It needs one extra space since one space is wasted to differentiate + * empty and full queues. + */ + ctx->queueSize = queueSize + 1; + ctx->queue = (POOL_job*)ZSTD_customMalloc(ctx->queueSize * sizeof(POOL_job), customMem); + ctx->queueHead = 0; + ctx->queueTail = 0; + ctx->numThreadsBusy = 0; + ctx->queueEmpty = 1; + { + int error = 0; + error |= ZSTD_pthread_mutex_init(&ctx->queueMutex, NULL); + error |= ZSTD_pthread_cond_init(&ctx->queuePushCond, NULL); + error |= ZSTD_pthread_cond_init(&ctx->queuePopCond, NULL); + if (error) { POOL_free(ctx); return NULL; } + } + ctx->shutdown = 0; + /* Allocate space for the thread handles */ + ctx->threads = (ZSTD_pthread_t*)ZSTD_customMalloc(numThreads * sizeof(ZSTD_pthread_t), customMem); + ctx->threadCapacity = 0; + ctx->customMem = customMem; + /* Check for errors */ + if (!ctx->threads || !ctx->queue) { POOL_free(ctx); return NULL; } + /* Initialize the threads */ + { size_t i; + for (i = 0; i < numThreads; ++i) { + if (ZSTD_pthread_create(&ctx->threads[i], NULL, &POOL_thread, ctx)) { + ctx->threadCapacity = i; + POOL_free(ctx); + return NULL; + } } + ctx->threadCapacity = numThreads; + ctx->threadLimit = numThreads; + } + return ctx; +} + +/*! POOL_join() : + Shutdown the queue, wake any sleeping threads, and join all of the threads. +*/ +static void POOL_join(POOL_ctx* ctx) { + /* Shut down the queue */ + ZSTD_pthread_mutex_lock(&ctx->queueMutex); + ctx->shutdown = 1; + ZSTD_pthread_mutex_unlock(&ctx->queueMutex); + /* Wake up sleeping threads */ + ZSTD_pthread_cond_broadcast(&ctx->queuePushCond); + ZSTD_pthread_cond_broadcast(&ctx->queuePopCond); + /* Join all of the threads */ + { size_t i; + for (i = 0; i < ctx->threadCapacity; ++i) { + ZSTD_pthread_join(ctx->threads[i], NULL); /* note : could fail */ + } } +} + +void POOL_free(POOL_ctx *ctx) { + if (!ctx) { return; } + POOL_join(ctx); + ZSTD_pthread_mutex_destroy(&ctx->queueMutex); + ZSTD_pthread_cond_destroy(&ctx->queuePushCond); + ZSTD_pthread_cond_destroy(&ctx->queuePopCond); + ZSTD_customFree(ctx->queue, ctx->customMem); + ZSTD_customFree(ctx->threads, ctx->customMem); + ZSTD_customFree(ctx, ctx->customMem); +} + +void ZSTD_freeThreadPool (ZSTD_threadPool* pool) { + POOL_free (pool); +} + +size_t POOL_sizeof(POOL_ctx *ctx) { + if (ctx==NULL) return 0; /* supports sizeof NULL */ + return sizeof(*ctx) + + ctx->queueSize * sizeof(POOL_job) + + ctx->threadCapacity * sizeof(ZSTD_pthread_t); +} + + +/* @return : 0 on success, 1 on error */ +static int POOL_resize_internal(POOL_ctx* ctx, size_t numThreads) +{ + if (numThreads <= ctx->threadCapacity) { + if (!numThreads) return 1; + ctx->threadLimit = numThreads; + return 0; + } + /* numThreads > threadCapacity */ + { ZSTD_pthread_t* const threadPool = (ZSTD_pthread_t*)ZSTD_customMalloc(numThreads * sizeof(ZSTD_pthread_t), ctx->customMem); + if (!threadPool) return 1; + /* replace existing thread pool */ + ZSTD_memcpy(threadPool, ctx->threads, ctx->threadCapacity * sizeof(*threadPool)); + ZSTD_customFree(ctx->threads, ctx->customMem); + ctx->threads = threadPool; + /* Initialize additional threads */ + { size_t threadId; + for (threadId = ctx->threadCapacity; threadId < numThreads; ++threadId) { + if (ZSTD_pthread_create(&threadPool[threadId], NULL, &POOL_thread, ctx)) { + ctx->threadCapacity = threadId; + return 1; + } } + } } + /* successfully expanded */ + ctx->threadCapacity = numThreads; + ctx->threadLimit = numThreads; + return 0; +} + +/* @return : 0 on success, 1 on error */ +int POOL_resize(POOL_ctx* ctx, size_t numThreads) +{ + int result; + if (ctx==NULL) return 1; + ZSTD_pthread_mutex_lock(&ctx->queueMutex); + result = POOL_resize_internal(ctx, numThreads); + ZSTD_pthread_cond_broadcast(&ctx->queuePopCond); + ZSTD_pthread_mutex_unlock(&ctx->queueMutex); + return result; +} + +/** + * Returns 1 if the queue is full and 0 otherwise. + * + * When queueSize is 1 (pool was created with an intended queueSize of 0), + * then a queue is empty if there is a thread free _and_ no job is waiting. + */ +static int isQueueFull(POOL_ctx const* ctx) { + if (ctx->queueSize > 1) { + return ctx->queueHead == ((ctx->queueTail + 1) % ctx->queueSize); + } else { + return (ctx->numThreadsBusy == ctx->threadLimit) || + !ctx->queueEmpty; + } +} + + +static void POOL_add_internal(POOL_ctx* ctx, POOL_function function, void *opaque) +{ + POOL_job const job = {function, opaque}; + assert(ctx != NULL); + if (ctx->shutdown) return; + + ctx->queueEmpty = 0; + ctx->queue[ctx->queueTail] = job; + ctx->queueTail = (ctx->queueTail + 1) % ctx->queueSize; + ZSTD_pthread_cond_signal(&ctx->queuePopCond); +} + +void POOL_add(POOL_ctx* ctx, POOL_function function, void* opaque) +{ + assert(ctx != NULL); + ZSTD_pthread_mutex_lock(&ctx->queueMutex); + /* Wait until there is space in the queue for the new job */ + while (isQueueFull(ctx) && (!ctx->shutdown)) { + ZSTD_pthread_cond_wait(&ctx->queuePushCond, &ctx->queueMutex); + } + POOL_add_internal(ctx, function, opaque); + ZSTD_pthread_mutex_unlock(&ctx->queueMutex); +} + + +int POOL_tryAdd(POOL_ctx* ctx, POOL_function function, void* opaque) +{ + assert(ctx != NULL); + ZSTD_pthread_mutex_lock(&ctx->queueMutex); + if (isQueueFull(ctx)) { + ZSTD_pthread_mutex_unlock(&ctx->queueMutex); + return 0; + } + POOL_add_internal(ctx, function, opaque); + ZSTD_pthread_mutex_unlock(&ctx->queueMutex); + return 1; +} + + +#else /* ZSTD_MULTITHREAD not defined */ + +/* ========================== */ +/* No multi-threading support */ +/* ========================== */ + + +/* We don't need any data, but if it is empty, malloc() might return NULL. */ +struct POOL_ctx_s { + int dummy; +}; +static POOL_ctx g_poolCtx; + +POOL_ctx* POOL_create(size_t numThreads, size_t queueSize) { + return POOL_create_advanced(numThreads, queueSize, ZSTD_defaultCMem); +} + +POOL_ctx* POOL_create_advanced(size_t numThreads, size_t queueSize, ZSTD_customMem customMem) { + (void)numThreads; + (void)queueSize; + (void)customMem; + return &g_poolCtx; +} + +void POOL_free(POOL_ctx* ctx) { + assert(!ctx || ctx == &g_poolCtx); + (void)ctx; +} + +int POOL_resize(POOL_ctx* ctx, size_t numThreads) { + (void)ctx; (void)numThreads; + return 0; +} + +void POOL_add(POOL_ctx* ctx, POOL_function function, void* opaque) { + (void)ctx; + function(opaque); +} + +int POOL_tryAdd(POOL_ctx* ctx, POOL_function function, void* opaque) { + (void)ctx; + function(opaque); + return 1; +} + +size_t POOL_sizeof(POOL_ctx* ctx) { + if (ctx==NULL) return 0; /* supports sizeof NULL */ + assert(ctx == &g_poolCtx); + return sizeof(*ctx); +} + +#endif /* ZSTD_MULTITHREAD */ diff --git a/external/zstd/lib/common/pool.h b/external/zstd/lib/common/pool.h new file mode 100644 index 00000000..e18aa070 --- /dev/null +++ b/external/zstd/lib/common/pool.h @@ -0,0 +1,84 @@ +/* + * Copyright (c) Yann Collet, Facebook, Inc. + * All rights reserved. + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. + */ + +#ifndef POOL_H +#define POOL_H + +#if defined (__cplusplus) +extern "C" { +#endif + + +#include "zstd_deps.h" +#define ZSTD_STATIC_LINKING_ONLY /* ZSTD_customMem */ +#include "../zstd.h" + +typedef struct POOL_ctx_s POOL_ctx; + +/*! POOL_create() : + * Create a thread pool with at most `numThreads` threads. + * `numThreads` must be at least 1. + * The maximum number of queued jobs before blocking is `queueSize`. + * @return : POOL_ctx pointer on success, else NULL. +*/ +POOL_ctx* POOL_create(size_t numThreads, size_t queueSize); + +POOL_ctx* POOL_create_advanced(size_t numThreads, size_t queueSize, + ZSTD_customMem customMem); + +/*! POOL_free() : + * Free a thread pool returned by POOL_create(). + */ +void POOL_free(POOL_ctx* ctx); + +/*! POOL_resize() : + * Expands or shrinks pool's number of threads. + * This is more efficient than releasing + creating a new context, + * since it tries to preserve and re-use existing threads. + * `numThreads` must be at least 1. + * @return : 0 when resize was successful, + * !0 (typically 1) if there is an error. + * note : only numThreads can be resized, queueSize remains unchanged. + */ +int POOL_resize(POOL_ctx* ctx, size_t numThreads); + +/*! POOL_sizeof() : + * @return threadpool memory usage + * note : compatible with NULL (returns 0 in this case) + */ +size_t POOL_sizeof(POOL_ctx* ctx); + +/*! POOL_function : + * The function type that can be added to a thread pool. + */ +typedef void (*POOL_function)(void*); + +/*! POOL_add() : + * Add the job `function(opaque)` to the thread pool. `ctx` must be valid. + * Possibly blocks until there is room in the queue. + * Note : The function may be executed asynchronously, + * therefore, `opaque` must live until function has been completed. + */ +void POOL_add(POOL_ctx* ctx, POOL_function function, void* opaque); + + +/*! POOL_tryAdd() : + * Add the job `function(opaque)` to thread pool _if_ a worker is available. + * Returns immediately even if not (does not block). + * @return : 1 if successful, 0 if not. + */ +int POOL_tryAdd(POOL_ctx* ctx, POOL_function function, void* opaque); + + +#if defined (__cplusplus) +} +#endif + +#endif diff --git a/external/zstd/lib/common/portability_macros.h b/external/zstd/lib/common/portability_macros.h new file mode 100644 index 00000000..627ef9ee --- /dev/null +++ b/external/zstd/lib/common/portability_macros.h @@ -0,0 +1,131 @@ +/* + * Copyright (c) Facebook, Inc. + * All rights reserved. + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. + */ + +#ifndef ZSTD_PORTABILITY_MACROS_H +#define ZSTD_PORTABILITY_MACROS_H + +/** + * This header file contains macro defintions to support portability. + * This header is shared between C and ASM code, so it MUST only + * contain macro definitions. It MUST not contain any C code. + * + * This header ONLY defines macros to detect platforms/feature support. + * + */ + + +/* compat. with non-clang compilers */ +#ifndef __has_attribute + #define __has_attribute(x) 0 +#endif + +/* compat. with non-clang compilers */ +#ifndef __has_builtin +# define __has_builtin(x) 0 +#endif + +/* compat. with non-clang compilers */ +#ifndef __has_feature +# define __has_feature(x) 0 +#endif + +/* detects whether we are being compiled under msan */ +#ifndef ZSTD_MEMORY_SANITIZER +# if __has_feature(memory_sanitizer) +# define ZSTD_MEMORY_SANITIZER 1 +# else +# define ZSTD_MEMORY_SANITIZER 0 +# endif +#endif + +/* detects whether we are being compiled under asan */ +#ifndef ZSTD_ADDRESS_SANITIZER +# if __has_feature(address_sanitizer) +# define ZSTD_ADDRESS_SANITIZER 1 +# elif defined(__SANITIZE_ADDRESS__) +# define ZSTD_ADDRESS_SANITIZER 1 +# else +# define ZSTD_ADDRESS_SANITIZER 0 +# endif +#endif + +/* detects whether we are being compiled under dfsan */ +#ifndef ZSTD_DATAFLOW_SANITIZER +# if __has_feature(dataflow_sanitizer) +# define ZSTD_DATAFLOW_SANITIZER 1 +# else +# define ZSTD_DATAFLOW_SANITIZER 0 +# endif +#endif + + +/* Enable runtime BMI2 dispatch based on the CPU. + * Enabled for clang & gcc >=4.8 on x86 when BMI2 isn't enabled by default. + */ +#ifndef DYNAMIC_BMI2 + #if ((defined(__clang__) && __has_attribute(__target__)) \ + || (defined(__GNUC__) \ + && (__GNUC__ >= 5 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8)))) \ + && (defined(__x86_64__) || defined(_M_X64)) \ + && !defined(__BMI2__) + # define DYNAMIC_BMI2 1 + #else + # define DYNAMIC_BMI2 0 + #endif +#endif + +/** + * Only enable assembly for GNUC comptabile compilers, + * because other platforms may not support GAS assembly syntax. + * + * Only enable assembly for Linux / MacOS, other platforms may + * work, but they haven't been tested. This could likely be + * extended to BSD systems. + * + * Disable assembly when MSAN is enabled, because MSAN requires + * 100% of code to be instrumented to work. + */ +#if defined(__GNUC__) +# if defined(__linux__) || defined(__linux) || defined(__APPLE__) +# if ZSTD_MEMORY_SANITIZER +# define ZSTD_ASM_SUPPORTED 0 +# elif ZSTD_DATAFLOW_SANITIZER +# define ZSTD_ASM_SUPPORTED 0 +# else +# define ZSTD_ASM_SUPPORTED 1 +# endif +# else +# define ZSTD_ASM_SUPPORTED 0 +# endif +#else +# define ZSTD_ASM_SUPPORTED 0 +#endif + +/** + * Determines whether we should enable assembly for x86-64 + * with BMI2. + * + * Enable if all of the following conditions hold: + * - ASM hasn't been explicitly disabled by defining ZSTD_DISABLE_ASM + * - Assembly is supported + * - We are compiling for x86-64 and either: + * - DYNAMIC_BMI2 is enabled + * - BMI2 is supported at compile time + */ +#if !defined(ZSTD_DISABLE_ASM) && \ + ZSTD_ASM_SUPPORTED && \ + defined(__x86_64__) && \ + (DYNAMIC_BMI2 || defined(__BMI2__)) +# define ZSTD_ENABLE_ASM_X86_64_BMI2 1 +#else +# define ZSTD_ENABLE_ASM_X86_64_BMI2 0 +#endif + +#endif /* ZSTD_PORTABILITY_MACROS_H */ diff --git a/external/zstd/lib/common/threading.c b/external/zstd/lib/common/threading.c new file mode 100644 index 00000000..92cf57c1 --- /dev/null +++ b/external/zstd/lib/common/threading.c @@ -0,0 +1,122 @@ +/** + * Copyright (c) 2016 Tino Reichardt + * All rights reserved. + * + * You can contact the author at: + * - zstdmt source repository: https://github.com/mcmilk/zstdmt + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. + */ + +/** + * This file will hold wrapper for systems, which do not support pthreads + */ + +#include "threading.h" + +/* create fake symbol to avoid empty translation unit warning */ +int g_ZSTD_threading_useless_symbol; + +#if defined(ZSTD_MULTITHREAD) && defined(_WIN32) + +/** + * Windows minimalist Pthread Wrapper, based on : + * http://www.cse.wustl.edu/~schmidt/win32-cv-1.html + */ + + +/* === Dependencies === */ +#include +#include + + +/* === Implementation === */ + +static unsigned __stdcall worker(void *arg) +{ + ZSTD_pthread_t* const thread = (ZSTD_pthread_t*) arg; + thread->arg = thread->start_routine(thread->arg); + return 0; +} + +int ZSTD_pthread_create(ZSTD_pthread_t* thread, const void* unused, + void* (*start_routine) (void*), void* arg) +{ + (void)unused; + thread->arg = arg; + thread->start_routine = start_routine; + thread->handle = (HANDLE) _beginthreadex(NULL, 0, worker, thread, 0, NULL); + + if (!thread->handle) + return errno; + else + return 0; +} + +int ZSTD_pthread_join(ZSTD_pthread_t thread, void **value_ptr) +{ + DWORD result; + + if (!thread.handle) return 0; + + result = WaitForSingleObject(thread.handle, INFINITE); + switch (result) { + case WAIT_OBJECT_0: + if (value_ptr) *value_ptr = thread.arg; + return 0; + case WAIT_ABANDONED: + return EINVAL; + default: + return GetLastError(); + } +} + +#endif /* ZSTD_MULTITHREAD */ + +#if defined(ZSTD_MULTITHREAD) && DEBUGLEVEL >= 1 && !defined(_WIN32) + +#define ZSTD_DEPS_NEED_MALLOC +#include "zstd_deps.h" + +int ZSTD_pthread_mutex_init(ZSTD_pthread_mutex_t* mutex, pthread_mutexattr_t const* attr) +{ + *mutex = (pthread_mutex_t*)ZSTD_malloc(sizeof(pthread_mutex_t)); + if (!*mutex) + return 1; + return pthread_mutex_init(*mutex, attr); +} + +int ZSTD_pthread_mutex_destroy(ZSTD_pthread_mutex_t* mutex) +{ + if (!*mutex) + return 0; + { + int const ret = pthread_mutex_destroy(*mutex); + ZSTD_free(*mutex); + return ret; + } +} + +int ZSTD_pthread_cond_init(ZSTD_pthread_cond_t* cond, pthread_condattr_t const* attr) +{ + *cond = (pthread_cond_t*)ZSTD_malloc(sizeof(pthread_cond_t)); + if (!*cond) + return 1; + return pthread_cond_init(*cond, attr); +} + +int ZSTD_pthread_cond_destroy(ZSTD_pthread_cond_t* cond) +{ + if (!*cond) + return 0; + { + int const ret = pthread_cond_destroy(*cond); + ZSTD_free(*cond); + return ret; + } +} + +#endif diff --git a/external/zstd/lib/common/threading.h b/external/zstd/lib/common/threading.h new file mode 100644 index 00000000..fd0060d5 --- /dev/null +++ b/external/zstd/lib/common/threading.h @@ -0,0 +1,155 @@ +/** + * Copyright (c) 2016 Tino Reichardt + * All rights reserved. + * + * You can contact the author at: + * - zstdmt source repository: https://github.com/mcmilk/zstdmt + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. + */ + +#ifndef THREADING_H_938743 +#define THREADING_H_938743 + +#include "debug.h" + +#if defined (__cplusplus) +extern "C" { +#endif + +#if defined(ZSTD_MULTITHREAD) && defined(_WIN32) + +/** + * Windows minimalist Pthread Wrapper, based on : + * http://www.cse.wustl.edu/~schmidt/win32-cv-1.html + */ +#ifdef WINVER +# undef WINVER +#endif +#define WINVER 0x0600 + +#ifdef _WIN32_WINNT +# undef _WIN32_WINNT +#endif +#define _WIN32_WINNT 0x0600 + +#ifndef WIN32_LEAN_AND_MEAN +# define WIN32_LEAN_AND_MEAN +#endif + +#undef ERROR /* reported already defined on VS 2015 (Rich Geldreich) */ +#include +#undef ERROR +#define ERROR(name) ZSTD_ERROR(name) + + +/* mutex */ +#define ZSTD_pthread_mutex_t CRITICAL_SECTION +#define ZSTD_pthread_mutex_init(a, b) ((void)(b), InitializeCriticalSection((a)), 0) +#define ZSTD_pthread_mutex_destroy(a) DeleteCriticalSection((a)) +#define ZSTD_pthread_mutex_lock(a) EnterCriticalSection((a)) +#define ZSTD_pthread_mutex_unlock(a) LeaveCriticalSection((a)) + +/* condition variable */ +#define ZSTD_pthread_cond_t CONDITION_VARIABLE +#define ZSTD_pthread_cond_init(a, b) ((void)(b), InitializeConditionVariable((a)), 0) +#define ZSTD_pthread_cond_destroy(a) ((void)(a)) +#define ZSTD_pthread_cond_wait(a, b) SleepConditionVariableCS((a), (b), INFINITE) +#define ZSTD_pthread_cond_signal(a) WakeConditionVariable((a)) +#define ZSTD_pthread_cond_broadcast(a) WakeAllConditionVariable((a)) + +/* ZSTD_pthread_create() and ZSTD_pthread_join() */ +typedef struct { + HANDLE handle; + void* (*start_routine)(void*); + void* arg; +} ZSTD_pthread_t; + +int ZSTD_pthread_create(ZSTD_pthread_t* thread, const void* unused, + void* (*start_routine) (void*), void* arg); + +int ZSTD_pthread_join(ZSTD_pthread_t thread, void** value_ptr); + +/** + * add here more wrappers as required + */ + + +#elif defined(ZSTD_MULTITHREAD) /* posix assumed ; need a better detection method */ +/* === POSIX Systems === */ +# include + +#if DEBUGLEVEL < 1 + +#define ZSTD_pthread_mutex_t pthread_mutex_t +#define ZSTD_pthread_mutex_init(a, b) pthread_mutex_init((a), (b)) +#define ZSTD_pthread_mutex_destroy(a) pthread_mutex_destroy((a)) +#define ZSTD_pthread_mutex_lock(a) pthread_mutex_lock((a)) +#define ZSTD_pthread_mutex_unlock(a) pthread_mutex_unlock((a)) + +#define ZSTD_pthread_cond_t pthread_cond_t +#define ZSTD_pthread_cond_init(a, b) pthread_cond_init((a), (b)) +#define ZSTD_pthread_cond_destroy(a) pthread_cond_destroy((a)) +#define ZSTD_pthread_cond_wait(a, b) pthread_cond_wait((a), (b)) +#define ZSTD_pthread_cond_signal(a) pthread_cond_signal((a)) +#define ZSTD_pthread_cond_broadcast(a) pthread_cond_broadcast((a)) + +#define ZSTD_pthread_t pthread_t +#define ZSTD_pthread_create(a, b, c, d) pthread_create((a), (b), (c), (d)) +#define ZSTD_pthread_join(a, b) pthread_join((a),(b)) + +#else /* DEBUGLEVEL >= 1 */ + +/* Debug implementation of threading. + * In this implementation we use pointers for mutexes and condition variables. + * This way, if we forget to init/destroy them the program will crash or ASAN + * will report leaks. + */ + +#define ZSTD_pthread_mutex_t pthread_mutex_t* +int ZSTD_pthread_mutex_init(ZSTD_pthread_mutex_t* mutex, pthread_mutexattr_t const* attr); +int ZSTD_pthread_mutex_destroy(ZSTD_pthread_mutex_t* mutex); +#define ZSTD_pthread_mutex_lock(a) pthread_mutex_lock(*(a)) +#define ZSTD_pthread_mutex_unlock(a) pthread_mutex_unlock(*(a)) + +#define ZSTD_pthread_cond_t pthread_cond_t* +int ZSTD_pthread_cond_init(ZSTD_pthread_cond_t* cond, pthread_condattr_t const* attr); +int ZSTD_pthread_cond_destroy(ZSTD_pthread_cond_t* cond); +#define ZSTD_pthread_cond_wait(a, b) pthread_cond_wait(*(a), *(b)) +#define ZSTD_pthread_cond_signal(a) pthread_cond_signal(*(a)) +#define ZSTD_pthread_cond_broadcast(a) pthread_cond_broadcast(*(a)) + +#define ZSTD_pthread_t pthread_t +#define ZSTD_pthread_create(a, b, c, d) pthread_create((a), (b), (c), (d)) +#define ZSTD_pthread_join(a, b) pthread_join((a),(b)) + +#endif + +#else /* ZSTD_MULTITHREAD not defined */ +/* No multithreading support */ + +typedef int ZSTD_pthread_mutex_t; +#define ZSTD_pthread_mutex_init(a, b) ((void)(a), (void)(b), 0) +#define ZSTD_pthread_mutex_destroy(a) ((void)(a)) +#define ZSTD_pthread_mutex_lock(a) ((void)(a)) +#define ZSTD_pthread_mutex_unlock(a) ((void)(a)) + +typedef int ZSTD_pthread_cond_t; +#define ZSTD_pthread_cond_init(a, b) ((void)(a), (void)(b), 0) +#define ZSTD_pthread_cond_destroy(a) ((void)(a)) +#define ZSTD_pthread_cond_wait(a, b) ((void)(a), (void)(b)) +#define ZSTD_pthread_cond_signal(a) ((void)(a)) +#define ZSTD_pthread_cond_broadcast(a) ((void)(a)) + +/* do not use ZSTD_pthread_t */ + +#endif /* ZSTD_MULTITHREAD */ + +#if defined (__cplusplus) +} +#endif + +#endif /* THREADING_H_938743 */ diff --git a/external/zstd/lib/common/xxhash.c b/external/zstd/lib/common/xxhash.c new file mode 100644 index 00000000..926b3360 --- /dev/null +++ b/external/zstd/lib/common/xxhash.c @@ -0,0 +1,824 @@ +/* + * xxHash - Fast Hash algorithm + * Copyright (c) Yann Collet, Facebook, Inc. + * + * You can contact the author at : + * - xxHash homepage: http://www.xxhash.com + * - xxHash source repository : https://github.com/Cyan4973/xxHash + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. +*/ + + +/* ************************************* +* Tuning parameters +***************************************/ +/*!XXH_FORCE_MEMORY_ACCESS : + * By default, access to unaligned memory is controlled by `memcpy()`, which is safe and portable. + * Unfortunately, on some target/compiler combinations, the generated assembly is sub-optimal. + * The below switch allow to select different access method for improved performance. + * Method 0 (default) : use `memcpy()`. Safe and portable. + * Method 1 : `__packed` statement. It depends on compiler extension (ie, not portable). + * This method is safe if your compiler supports it, and *generally* as fast or faster than `memcpy`. + * Method 2 : direct access. This method doesn't depend on compiler but violate C standard. + * It can generate buggy code on targets which do not support unaligned memory accesses. + * But in some circumstances, it's the only known way to get the most performance (ie GCC + ARMv6) + * See http://stackoverflow.com/a/32095106/646947 for details. + * Prefer these methods in priority order (0 > 1 > 2) + */ +#ifndef XXH_FORCE_MEMORY_ACCESS /* can be defined externally, on command line for example */ +# if (defined(__INTEL_COMPILER) && !defined(WIN32)) || \ + (defined(__GNUC__) && ( defined(__ARM_ARCH_7__) || defined(__ARM_ARCH_7A__) || defined(__ARM_ARCH_7R__) || defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7S__) )) || \ + defined(__ICCARM__) +# define XXH_FORCE_MEMORY_ACCESS 1 +# endif +#endif + +/*!XXH_ACCEPT_NULL_INPUT_POINTER : + * If the input pointer is a null pointer, xxHash default behavior is to trigger a memory access error, since it is a bad pointer. + * When this option is enabled, xxHash output for null input pointers will be the same as a null-length input. + * By default, this option is disabled. To enable it, uncomment below define : + */ +/* #define XXH_ACCEPT_NULL_INPUT_POINTER 1 */ + +/*!XXH_FORCE_NATIVE_FORMAT : + * By default, xxHash library provides endian-independent Hash values, based on little-endian convention. + * Results are therefore identical for little-endian and big-endian CPU. + * This comes at a performance cost for big-endian CPU, since some swapping is required to emulate little-endian format. + * Should endian-independence be of no importance for your application, you may set the #define below to 1, + * to improve speed for Big-endian CPU. + * This option has no impact on Little_Endian CPU. + */ +#ifndef XXH_FORCE_NATIVE_FORMAT /* can be defined externally */ +# define XXH_FORCE_NATIVE_FORMAT 0 +#endif + +/*!XXH_FORCE_ALIGN_CHECK : + * This is a minor performance trick, only useful with lots of very small keys. + * It means : check for aligned/unaligned input. + * The check costs one initial branch per hash; set to 0 when the input data + * is guaranteed to be aligned. + */ +#ifndef XXH_FORCE_ALIGN_CHECK /* can be defined externally */ +# if defined(__i386) || defined(_M_IX86) || defined(__x86_64__) || defined(_M_X64) +# define XXH_FORCE_ALIGN_CHECK 0 +# else +# define XXH_FORCE_ALIGN_CHECK 1 +# endif +#endif + + +/* ************************************* +* Includes & Memory related functions +***************************************/ +/* Modify the local functions below should you wish to use some other memory routines */ +/* for ZSTD_malloc(), ZSTD_free() */ +#define ZSTD_DEPS_NEED_MALLOC +#include "zstd_deps.h" /* size_t, ZSTD_malloc, ZSTD_free, ZSTD_memcpy */ +static void* XXH_malloc(size_t s) { return ZSTD_malloc(s); } +static void XXH_free (void* p) { ZSTD_free(p); } +static void* XXH_memcpy(void* dest, const void* src, size_t size) { return ZSTD_memcpy(dest,src,size); } + +#ifndef XXH_STATIC_LINKING_ONLY +# define XXH_STATIC_LINKING_ONLY +#endif +#include "xxhash.h" + + +/* ************************************* +* Compiler Specific Options +***************************************/ +#include "compiler.h" + + +/* ************************************* +* Basic Types +***************************************/ +#include "mem.h" /* BYTE, U32, U64, size_t */ + +#if (defined(XXH_FORCE_MEMORY_ACCESS) && (XXH_FORCE_MEMORY_ACCESS==2)) + +/* Force direct memory access. Only works on CPU which support unaligned memory access in hardware */ +static U32 XXH_read32(const void* memPtr) { return *(const U32*) memPtr; } +static U64 XXH_read64(const void* memPtr) { return *(const U64*) memPtr; } + +#elif (defined(XXH_FORCE_MEMORY_ACCESS) && (XXH_FORCE_MEMORY_ACCESS==1)) + +/* __pack instructions are safer, but compiler specific, hence potentially problematic for some compilers */ +/* currently only defined for gcc and icc */ +typedef union { U32 u32; U64 u64; } __attribute__((packed)) unalign; + +static U32 XXH_read32(const void* ptr) { return ((const unalign*)ptr)->u32; } +static U64 XXH_read64(const void* ptr) { return ((const unalign*)ptr)->u64; } + +#else + +/* portable and safe solution. Generally efficient. + * see : http://stackoverflow.com/a/32095106/646947 + */ + +static U32 XXH_read32(const void* memPtr) +{ + U32 val; + ZSTD_memcpy(&val, memPtr, sizeof(val)); + return val; +} + +static U64 XXH_read64(const void* memPtr) +{ + U64 val; + ZSTD_memcpy(&val, memPtr, sizeof(val)); + return val; +} + +#endif /* XXH_FORCE_DIRECT_MEMORY_ACCESS */ + + +/* **************************************** +* Compiler-specific Functions and Macros +******************************************/ +#define GCC_VERSION (__GNUC__ * 100 + __GNUC_MINOR__) + +/* Note : although _rotl exists for minGW (GCC under windows), performance seems poor */ +#if defined(_MSC_VER) +# define XXH_rotl32(x,r) _rotl(x,r) +# define XXH_rotl64(x,r) _rotl64(x,r) +#else +#if defined(__ICCARM__) +# include +# define XXH_rotl32(x,r) __ROR(x,(32 - r)) +#else +# define XXH_rotl32(x,r) ((x << r) | (x >> (32 - r))) +#endif +# define XXH_rotl64(x,r) ((x << r) | (x >> (64 - r))) +#endif + +#if defined(_MSC_VER) /* Visual Studio */ +# define XXH_swap32 _byteswap_ulong +# define XXH_swap64 _byteswap_uint64 +#elif GCC_VERSION >= 403 +# define XXH_swap32 __builtin_bswap32 +# define XXH_swap64 __builtin_bswap64 +#else +static U32 XXH_swap32 (U32 x) +{ + return ((x << 24) & 0xff000000 ) | + ((x << 8) & 0x00ff0000 ) | + ((x >> 8) & 0x0000ff00 ) | + ((x >> 24) & 0x000000ff ); +} +static U64 XXH_swap64 (U64 x) +{ + return ((x << 56) & 0xff00000000000000ULL) | + ((x << 40) & 0x00ff000000000000ULL) | + ((x << 24) & 0x0000ff0000000000ULL) | + ((x << 8) & 0x000000ff00000000ULL) | + ((x >> 8) & 0x00000000ff000000ULL) | + ((x >> 24) & 0x0000000000ff0000ULL) | + ((x >> 40) & 0x000000000000ff00ULL) | + ((x >> 56) & 0x00000000000000ffULL); +} +#endif + + +/* ************************************* +* Architecture Macros +***************************************/ +typedef enum { XXH_bigEndian=0, XXH_littleEndian=1 } XXH_endianess; + +/* XXH_CPU_LITTLE_ENDIAN can be defined externally, for example on the compiler command line */ +#ifndef XXH_CPU_LITTLE_ENDIAN + static const int g_one = 1; +# define XXH_CPU_LITTLE_ENDIAN (*(const char*)(&g_one)) +#endif + + +/* *************************** +* Memory reads +*****************************/ +typedef enum { XXH_aligned, XXH_unaligned } XXH_alignment; + +FORCE_INLINE_TEMPLATE U32 XXH_readLE32_align(const void* ptr, XXH_endianess endian, XXH_alignment align) +{ + if (align==XXH_unaligned) + return endian==XXH_littleEndian ? XXH_read32(ptr) : XXH_swap32(XXH_read32(ptr)); + else + return endian==XXH_littleEndian ? *(const U32*)ptr : XXH_swap32(*(const U32*)ptr); +} + +FORCE_INLINE_TEMPLATE U32 XXH_readLE32(const void* ptr, XXH_endianess endian) +{ + return XXH_readLE32_align(ptr, endian, XXH_unaligned); +} + +static U32 XXH_readBE32(const void* ptr) +{ + return XXH_CPU_LITTLE_ENDIAN ? XXH_swap32(XXH_read32(ptr)) : XXH_read32(ptr); +} + +FORCE_INLINE_TEMPLATE U64 XXH_readLE64_align(const void* ptr, XXH_endianess endian, XXH_alignment align) +{ + if (align==XXH_unaligned) + return endian==XXH_littleEndian ? XXH_read64(ptr) : XXH_swap64(XXH_read64(ptr)); + else + return endian==XXH_littleEndian ? *(const U64*)ptr : XXH_swap64(*(const U64*)ptr); +} + +FORCE_INLINE_TEMPLATE U64 XXH_readLE64(const void* ptr, XXH_endianess endian) +{ + return XXH_readLE64_align(ptr, endian, XXH_unaligned); +} + +static U64 XXH_readBE64(const void* ptr) +{ + return XXH_CPU_LITTLE_ENDIAN ? XXH_swap64(XXH_read64(ptr)) : XXH_read64(ptr); +} + + +/* ************************************* +* Macros +***************************************/ +#define XXH_STATIC_ASSERT(c) { enum { XXH_static_assert = 1/(int)(!!(c)) }; } /* use only *after* variable declarations */ + + +/* ************************************* +* Constants +***************************************/ +static const U32 PRIME32_1 = 2654435761U; +static const U32 PRIME32_2 = 2246822519U; +static const U32 PRIME32_3 = 3266489917U; +static const U32 PRIME32_4 = 668265263U; +static const U32 PRIME32_5 = 374761393U; + +static const U64 PRIME64_1 = 11400714785074694791ULL; +static const U64 PRIME64_2 = 14029467366897019727ULL; +static const U64 PRIME64_3 = 1609587929392839161ULL; +static const U64 PRIME64_4 = 9650029242287828579ULL; +static const U64 PRIME64_5 = 2870177450012600261ULL; + +XXH_PUBLIC_API unsigned XXH_versionNumber (void) { return XXH_VERSION_NUMBER; } + + +/* ************************** +* Utils +****************************/ +XXH_PUBLIC_API void XXH32_copyState(XXH32_state_t* restrict dstState, const XXH32_state_t* restrict srcState) +{ + ZSTD_memcpy(dstState, srcState, sizeof(*dstState)); +} + +XXH_PUBLIC_API void XXH64_copyState(XXH64_state_t* restrict dstState, const XXH64_state_t* restrict srcState) +{ + ZSTD_memcpy(dstState, srcState, sizeof(*dstState)); +} + + +/* *************************** +* Simple Hash Functions +*****************************/ + +static U32 XXH32_round(U32 seed, U32 input) +{ + seed += input * PRIME32_2; + seed = XXH_rotl32(seed, 13); + seed *= PRIME32_1; + return seed; +} + +FORCE_INLINE_TEMPLATE U32 XXH32_endian_align(const void* input, size_t len, U32 seed, XXH_endianess endian, XXH_alignment align) +{ + const BYTE* p = (const BYTE*)input; + const BYTE* bEnd = p + len; + U32 h32; +#define XXH_get32bits(p) XXH_readLE32_align(p, endian, align) + +#ifdef XXH_ACCEPT_NULL_INPUT_POINTER + if (p==NULL) { + len=0; + bEnd=p=(const BYTE*)(size_t)16; + } +#endif + + if (len>=16) { + const BYTE* const limit = bEnd - 16; + U32 v1 = seed + PRIME32_1 + PRIME32_2; + U32 v2 = seed + PRIME32_2; + U32 v3 = seed + 0; + U32 v4 = seed - PRIME32_1; + + do { + v1 = XXH32_round(v1, XXH_get32bits(p)); p+=4; + v2 = XXH32_round(v2, XXH_get32bits(p)); p+=4; + v3 = XXH32_round(v3, XXH_get32bits(p)); p+=4; + v4 = XXH32_round(v4, XXH_get32bits(p)); p+=4; + } while (p<=limit); + + h32 = XXH_rotl32(v1, 1) + XXH_rotl32(v2, 7) + XXH_rotl32(v3, 12) + XXH_rotl32(v4, 18); + } else { + h32 = seed + PRIME32_5; + } + + h32 += (U32) len; + + while (p+4<=bEnd) { + h32 += XXH_get32bits(p) * PRIME32_3; + h32 = XXH_rotl32(h32, 17) * PRIME32_4 ; + p+=4; + } + + while (p> 15; + h32 *= PRIME32_2; + h32 ^= h32 >> 13; + h32 *= PRIME32_3; + h32 ^= h32 >> 16; + + return h32; +} + + +XXH_PUBLIC_API unsigned int XXH32 (const void* input, size_t len, unsigned int seed) +{ +#if 0 + /* Simple version, good for code maintenance, but unfortunately slow for small inputs */ + XXH32_CREATESTATE_STATIC(state); + XXH32_reset(state, seed); + XXH32_update(state, input, len); + return XXH32_digest(state); +#else + XXH_endianess endian_detected = (XXH_endianess)XXH_CPU_LITTLE_ENDIAN; + + if (XXH_FORCE_ALIGN_CHECK) { + if ((((size_t)input) & 3) == 0) { /* Input is 4-bytes aligned, leverage the speed benefit */ + if ((endian_detected==XXH_littleEndian) || XXH_FORCE_NATIVE_FORMAT) + return XXH32_endian_align(input, len, seed, XXH_littleEndian, XXH_aligned); + else + return XXH32_endian_align(input, len, seed, XXH_bigEndian, XXH_aligned); + } } + + if ((endian_detected==XXH_littleEndian) || XXH_FORCE_NATIVE_FORMAT) + return XXH32_endian_align(input, len, seed, XXH_littleEndian, XXH_unaligned); + else + return XXH32_endian_align(input, len, seed, XXH_bigEndian, XXH_unaligned); +#endif +} + + +static U64 XXH64_round(U64 acc, U64 input) +{ + acc += input * PRIME64_2; + acc = XXH_rotl64(acc, 31); + acc *= PRIME64_1; + return acc; +} + +static U64 XXH64_mergeRound(U64 acc, U64 val) +{ + val = XXH64_round(0, val); + acc ^= val; + acc = acc * PRIME64_1 + PRIME64_4; + return acc; +} + +FORCE_INLINE_TEMPLATE U64 XXH64_endian_align(const void* input, size_t len, U64 seed, XXH_endianess endian, XXH_alignment align) +{ + const BYTE* p = (const BYTE*)input; + const BYTE* const bEnd = p + len; + U64 h64; +#define XXH_get64bits(p) XXH_readLE64_align(p, endian, align) + +#ifdef XXH_ACCEPT_NULL_INPUT_POINTER + if (p==NULL) { + len=0; + bEnd=p=(const BYTE*)(size_t)32; + } +#endif + + if (len>=32) { + const BYTE* const limit = bEnd - 32; + U64 v1 = seed + PRIME64_1 + PRIME64_2; + U64 v2 = seed + PRIME64_2; + U64 v3 = seed + 0; + U64 v4 = seed - PRIME64_1; + + do { + v1 = XXH64_round(v1, XXH_get64bits(p)); p+=8; + v2 = XXH64_round(v2, XXH_get64bits(p)); p+=8; + v3 = XXH64_round(v3, XXH_get64bits(p)); p+=8; + v4 = XXH64_round(v4, XXH_get64bits(p)); p+=8; + } while (p<=limit); + + h64 = XXH_rotl64(v1, 1) + XXH_rotl64(v2, 7) + XXH_rotl64(v3, 12) + XXH_rotl64(v4, 18); + h64 = XXH64_mergeRound(h64, v1); + h64 = XXH64_mergeRound(h64, v2); + h64 = XXH64_mergeRound(h64, v3); + h64 = XXH64_mergeRound(h64, v4); + + } else { + h64 = seed + PRIME64_5; + } + + h64 += (U64) len; + + while (p+8<=bEnd) { + U64 const k1 = XXH64_round(0, XXH_get64bits(p)); + h64 ^= k1; + h64 = XXH_rotl64(h64,27) * PRIME64_1 + PRIME64_4; + p+=8; + } + + if (p+4<=bEnd) { + h64 ^= (U64)(XXH_get32bits(p)) * PRIME64_1; + h64 = XXH_rotl64(h64, 23) * PRIME64_2 + PRIME64_3; + p+=4; + } + + while (p> 33; + h64 *= PRIME64_2; + h64 ^= h64 >> 29; + h64 *= PRIME64_3; + h64 ^= h64 >> 32; + + return h64; +} + + +XXH_PUBLIC_API unsigned long long XXH64 (const void* input, size_t len, unsigned long long seed) +{ +#if 0 + /* Simple version, good for code maintenance, but unfortunately slow for small inputs */ + XXH64_CREATESTATE_STATIC(state); + XXH64_reset(state, seed); + XXH64_update(state, input, len); + return XXH64_digest(state); +#else + XXH_endianess endian_detected = (XXH_endianess)XXH_CPU_LITTLE_ENDIAN; + + if (XXH_FORCE_ALIGN_CHECK) { + if ((((size_t)input) & 7)==0) { /* Input is aligned, let's leverage the speed advantage */ + if ((endian_detected==XXH_littleEndian) || XXH_FORCE_NATIVE_FORMAT) + return XXH64_endian_align(input, len, seed, XXH_littleEndian, XXH_aligned); + else + return XXH64_endian_align(input, len, seed, XXH_bigEndian, XXH_aligned); + } } + + if ((endian_detected==XXH_littleEndian) || XXH_FORCE_NATIVE_FORMAT) + return XXH64_endian_align(input, len, seed, XXH_littleEndian, XXH_unaligned); + else + return XXH64_endian_align(input, len, seed, XXH_bigEndian, XXH_unaligned); +#endif +} + + +/* ************************************************** +* Advanced Hash Functions +****************************************************/ + +XXH_PUBLIC_API XXH32_state_t* XXH32_createState(void) +{ + return (XXH32_state_t*)XXH_malloc(sizeof(XXH32_state_t)); +} +XXH_PUBLIC_API XXH_errorcode XXH32_freeState(XXH32_state_t* statePtr) +{ + XXH_free(statePtr); + return XXH_OK; +} + +XXH_PUBLIC_API XXH64_state_t* XXH64_createState(void) +{ + return (XXH64_state_t*)XXH_malloc(sizeof(XXH64_state_t)); +} +XXH_PUBLIC_API XXH_errorcode XXH64_freeState(XXH64_state_t* statePtr) +{ + XXH_free(statePtr); + return XXH_OK; +} + + +/*** Hash feed ***/ + +XXH_PUBLIC_API XXH_errorcode XXH32_reset(XXH32_state_t* statePtr, unsigned int seed) +{ + XXH32_state_t state; /* using a local state to memcpy() in order to avoid strict-aliasing warnings */ + ZSTD_memset(&state, 0, sizeof(state)-4); /* do not write into reserved, for future removal */ + state.v1 = seed + PRIME32_1 + PRIME32_2; + state.v2 = seed + PRIME32_2; + state.v3 = seed + 0; + state.v4 = seed - PRIME32_1; + ZSTD_memcpy(statePtr, &state, sizeof(state)); + return XXH_OK; +} + + +XXH_PUBLIC_API XXH_errorcode XXH64_reset(XXH64_state_t* statePtr, unsigned long long seed) +{ + XXH64_state_t state; /* using a local state to memcpy() in order to avoid strict-aliasing warnings */ + ZSTD_memset(&state, 0, sizeof(state)-8); /* do not write into reserved, for future removal */ + state.v1 = seed + PRIME64_1 + PRIME64_2; + state.v2 = seed + PRIME64_2; + state.v3 = seed + 0; + state.v4 = seed - PRIME64_1; + ZSTD_memcpy(statePtr, &state, sizeof(state)); + return XXH_OK; +} + + +FORCE_INLINE_TEMPLATE XXH_errorcode XXH32_update_endian (XXH32_state_t* state, const void* input, size_t len, XXH_endianess endian) +{ + const BYTE* p = (const BYTE*)input; + const BYTE* const bEnd = p + len; + +#ifdef XXH_ACCEPT_NULL_INPUT_POINTER + if (input==NULL) return XXH_ERROR; +#endif + + state->total_len_32 += (unsigned)len; + state->large_len |= (len>=16) | (state->total_len_32>=16); + + if (state->memsize + len < 16) { /* fill in tmp buffer */ + XXH_memcpy((BYTE*)(state->mem32) + state->memsize, input, len); + state->memsize += (unsigned)len; + return XXH_OK; + } + + if (state->memsize) { /* some data left from previous update */ + XXH_memcpy((BYTE*)(state->mem32) + state->memsize, input, 16-state->memsize); + { const U32* p32 = state->mem32; + state->v1 = XXH32_round(state->v1, XXH_readLE32(p32, endian)); p32++; + state->v2 = XXH32_round(state->v2, XXH_readLE32(p32, endian)); p32++; + state->v3 = XXH32_round(state->v3, XXH_readLE32(p32, endian)); p32++; + state->v4 = XXH32_round(state->v4, XXH_readLE32(p32, endian)); p32++; + } + p += 16-state->memsize; + state->memsize = 0; + } + + if (p <= bEnd-16) { + const BYTE* const limit = bEnd - 16; + U32 v1 = state->v1; + U32 v2 = state->v2; + U32 v3 = state->v3; + U32 v4 = state->v4; + + do { + v1 = XXH32_round(v1, XXH_readLE32(p, endian)); p+=4; + v2 = XXH32_round(v2, XXH_readLE32(p, endian)); p+=4; + v3 = XXH32_round(v3, XXH_readLE32(p, endian)); p+=4; + v4 = XXH32_round(v4, XXH_readLE32(p, endian)); p+=4; + } while (p<=limit); + + state->v1 = v1; + state->v2 = v2; + state->v3 = v3; + state->v4 = v4; + } + + if (p < bEnd) { + XXH_memcpy(state->mem32, p, (size_t)(bEnd-p)); + state->memsize = (unsigned)(bEnd-p); + } + + return XXH_OK; +} + +XXH_PUBLIC_API XXH_errorcode XXH32_update (XXH32_state_t* state_in, const void* input, size_t len) +{ + XXH_endianess endian_detected = (XXH_endianess)XXH_CPU_LITTLE_ENDIAN; + + if ((endian_detected==XXH_littleEndian) || XXH_FORCE_NATIVE_FORMAT) + return XXH32_update_endian(state_in, input, len, XXH_littleEndian); + else + return XXH32_update_endian(state_in, input, len, XXH_bigEndian); +} + + + +FORCE_INLINE_TEMPLATE U32 XXH32_digest_endian (const XXH32_state_t* state, XXH_endianess endian) +{ + const BYTE * p = (const BYTE*)state->mem32; + const BYTE* const bEnd = (const BYTE*)(state->mem32) + state->memsize; + U32 h32; + + if (state->large_len) { + h32 = XXH_rotl32(state->v1, 1) + XXH_rotl32(state->v2, 7) + XXH_rotl32(state->v3, 12) + XXH_rotl32(state->v4, 18); + } else { + h32 = state->v3 /* == seed */ + PRIME32_5; + } + + h32 += state->total_len_32; + + while (p+4<=bEnd) { + h32 += XXH_readLE32(p, endian) * PRIME32_3; + h32 = XXH_rotl32(h32, 17) * PRIME32_4; + p+=4; + } + + while (p> 15; + h32 *= PRIME32_2; + h32 ^= h32 >> 13; + h32 *= PRIME32_3; + h32 ^= h32 >> 16; + + return h32; +} + + +XXH_PUBLIC_API unsigned int XXH32_digest (const XXH32_state_t* state_in) +{ + XXH_endianess endian_detected = (XXH_endianess)XXH_CPU_LITTLE_ENDIAN; + + if ((endian_detected==XXH_littleEndian) || XXH_FORCE_NATIVE_FORMAT) + return XXH32_digest_endian(state_in, XXH_littleEndian); + else + return XXH32_digest_endian(state_in, XXH_bigEndian); +} + + + +/* **** XXH64 **** */ + +FORCE_INLINE_TEMPLATE XXH_errorcode XXH64_update_endian (XXH64_state_t* state, const void* input, size_t len, XXH_endianess endian) +{ + const BYTE* p = (const BYTE*)input; + const BYTE* const bEnd = p + len; + +#ifdef XXH_ACCEPT_NULL_INPUT_POINTER + if (input==NULL) return XXH_ERROR; +#endif + + state->total_len += len; + + if (state->memsize + len < 32) { /* fill in tmp buffer */ + if (input != NULL) { + XXH_memcpy(((BYTE*)state->mem64) + state->memsize, input, len); + } + state->memsize += (U32)len; + return XXH_OK; + } + + if (state->memsize) { /* tmp buffer is full */ + XXH_memcpy(((BYTE*)state->mem64) + state->memsize, input, 32-state->memsize); + state->v1 = XXH64_round(state->v1, XXH_readLE64(state->mem64+0, endian)); + state->v2 = XXH64_round(state->v2, XXH_readLE64(state->mem64+1, endian)); + state->v3 = XXH64_round(state->v3, XXH_readLE64(state->mem64+2, endian)); + state->v4 = XXH64_round(state->v4, XXH_readLE64(state->mem64+3, endian)); + p += 32-state->memsize; + state->memsize = 0; + } + + if (p+32 <= bEnd) { + const BYTE* const limit = bEnd - 32; + U64 v1 = state->v1; + U64 v2 = state->v2; + U64 v3 = state->v3; + U64 v4 = state->v4; + + do { + v1 = XXH64_round(v1, XXH_readLE64(p, endian)); p+=8; + v2 = XXH64_round(v2, XXH_readLE64(p, endian)); p+=8; + v3 = XXH64_round(v3, XXH_readLE64(p, endian)); p+=8; + v4 = XXH64_round(v4, XXH_readLE64(p, endian)); p+=8; + } while (p<=limit); + + state->v1 = v1; + state->v2 = v2; + state->v3 = v3; + state->v4 = v4; + } + + if (p < bEnd) { + XXH_memcpy(state->mem64, p, (size_t)(bEnd-p)); + state->memsize = (unsigned)(bEnd-p); + } + + return XXH_OK; +} + +XXH_PUBLIC_API XXH_errorcode XXH64_update (XXH64_state_t* state_in, const void* input, size_t len) +{ + XXH_endianess endian_detected = (XXH_endianess)XXH_CPU_LITTLE_ENDIAN; + + if ((endian_detected==XXH_littleEndian) || XXH_FORCE_NATIVE_FORMAT) + return XXH64_update_endian(state_in, input, len, XXH_littleEndian); + else + return XXH64_update_endian(state_in, input, len, XXH_bigEndian); +} + + + +FORCE_INLINE_TEMPLATE U64 XXH64_digest_endian (const XXH64_state_t* state, XXH_endianess endian) +{ + const BYTE * p = (const BYTE*)state->mem64; + const BYTE* const bEnd = (const BYTE*)state->mem64 + state->memsize; + U64 h64; + + if (state->total_len >= 32) { + U64 const v1 = state->v1; + U64 const v2 = state->v2; + U64 const v3 = state->v3; + U64 const v4 = state->v4; + + h64 = XXH_rotl64(v1, 1) + XXH_rotl64(v2, 7) + XXH_rotl64(v3, 12) + XXH_rotl64(v4, 18); + h64 = XXH64_mergeRound(h64, v1); + h64 = XXH64_mergeRound(h64, v2); + h64 = XXH64_mergeRound(h64, v3); + h64 = XXH64_mergeRound(h64, v4); + } else { + h64 = state->v3 + PRIME64_5; + } + + h64 += (U64) state->total_len; + + while (p+8<=bEnd) { + U64 const k1 = XXH64_round(0, XXH_readLE64(p, endian)); + h64 ^= k1; + h64 = XXH_rotl64(h64,27) * PRIME64_1 + PRIME64_4; + p+=8; + } + + if (p+4<=bEnd) { + h64 ^= (U64)(XXH_readLE32(p, endian)) * PRIME64_1; + h64 = XXH_rotl64(h64, 23) * PRIME64_2 + PRIME64_3; + p+=4; + } + + while (p> 33; + h64 *= PRIME64_2; + h64 ^= h64 >> 29; + h64 *= PRIME64_3; + h64 ^= h64 >> 32; + + return h64; +} + + +XXH_PUBLIC_API unsigned long long XXH64_digest (const XXH64_state_t* state_in) +{ + XXH_endianess endian_detected = (XXH_endianess)XXH_CPU_LITTLE_ENDIAN; + + if ((endian_detected==XXH_littleEndian) || XXH_FORCE_NATIVE_FORMAT) + return XXH64_digest_endian(state_in, XXH_littleEndian); + else + return XXH64_digest_endian(state_in, XXH_bigEndian); +} + + +/* ************************** +* Canonical representation +****************************/ + +/*! Default XXH result types are basic unsigned 32 and 64 bits. +* The canonical representation follows human-readable write convention, aka big-endian (large digits first). +* These functions allow transformation of hash result into and from its canonical format. +* This way, hash values can be written into a file or buffer, and remain comparable across different systems and programs. +*/ + +XXH_PUBLIC_API void XXH32_canonicalFromHash(XXH32_canonical_t* dst, XXH32_hash_t hash) +{ + XXH_STATIC_ASSERT(sizeof(XXH32_canonical_t) == sizeof(XXH32_hash_t)); + if (XXH_CPU_LITTLE_ENDIAN) hash = XXH_swap32(hash); + ZSTD_memcpy(dst, &hash, sizeof(*dst)); +} + +XXH_PUBLIC_API void XXH64_canonicalFromHash(XXH64_canonical_t* dst, XXH64_hash_t hash) +{ + XXH_STATIC_ASSERT(sizeof(XXH64_canonical_t) == sizeof(XXH64_hash_t)); + if (XXH_CPU_LITTLE_ENDIAN) hash = XXH_swap64(hash); + ZSTD_memcpy(dst, &hash, sizeof(*dst)); +} + +XXH_PUBLIC_API XXH32_hash_t XXH32_hashFromCanonical(const XXH32_canonical_t* src) +{ + return XXH_readBE32(src); +} + +XXH_PUBLIC_API XXH64_hash_t XXH64_hashFromCanonical(const XXH64_canonical_t* src) +{ + return XXH_readBE64(src); +} diff --git a/external/zstd/lib/common/xxhash.h b/external/zstd/lib/common/xxhash.h new file mode 100644 index 00000000..16c1f161 --- /dev/null +++ b/external/zstd/lib/common/xxhash.h @@ -0,0 +1,285 @@ +/* + * xxHash - Extremely Fast Hash algorithm + * Header File + * Copyright (c) Yann Collet, Facebook, Inc. + * + * You can contact the author at : + * - xxHash source repository : https://github.com/Cyan4973/xxHash + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. +*/ + +/* Notice extracted from xxHash homepage : + +xxHash is an extremely fast Hash algorithm, running at RAM speed limits. +It also successfully passes all tests from the SMHasher suite. + +Comparison (single thread, Windows Seven 32 bits, using SMHasher on a Core 2 Duo @3GHz) + +Name Speed Q.Score Author +xxHash 5.4 GB/s 10 +CrapWow 3.2 GB/s 2 Andrew +MumurHash 3a 2.7 GB/s 10 Austin Appleby +SpookyHash 2.0 GB/s 10 Bob Jenkins +SBox 1.4 GB/s 9 Bret Mulvey +Lookup3 1.2 GB/s 9 Bob Jenkins +SuperFastHash 1.2 GB/s 1 Paul Hsieh +CityHash64 1.05 GB/s 10 Pike & Alakuijala +FNV 0.55 GB/s 5 Fowler, Noll, Vo +CRC32 0.43 GB/s 9 +MD5-32 0.33 GB/s 10 Ronald L. Rivest +SHA1-32 0.28 GB/s 10 + +Q.Score is a measure of quality of the hash function. +It depends on successfully passing SMHasher test set. +10 is a perfect score. + +A 64-bits version, named XXH64, is available since r35. +It offers much better speed, but for 64-bits applications only. +Name Speed on 64 bits Speed on 32 bits +XXH64 13.8 GB/s 1.9 GB/s +XXH32 6.8 GB/s 6.0 GB/s +*/ + +#if defined (__cplusplus) +extern "C" { +#endif + +#ifndef XXHASH_H_5627135585666179 +#define XXHASH_H_5627135585666179 1 + + +/* **************************** +* Definitions +******************************/ +#include "zstd_deps.h" +typedef enum { XXH_OK=0, XXH_ERROR } XXH_errorcode; + + +/* **************************** +* API modifier +******************************/ +/** XXH_PRIVATE_API +* This is useful if you want to include xxhash functions in `static` mode +* in order to inline them, and remove their symbol from the public list. +* Methodology : +* #define XXH_PRIVATE_API +* #include "xxhash.h" +* `xxhash.c` is automatically included. +* It's not useful to compile and link it as a separate module anymore. +*/ +#ifdef XXH_PRIVATE_API +# ifndef XXH_STATIC_LINKING_ONLY +# define XXH_STATIC_LINKING_ONLY +# endif +# if defined(__GNUC__) +# define XXH_PUBLIC_API static __inline __attribute__((unused)) +# elif defined (__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */) +# define XXH_PUBLIC_API static inline +# elif defined(_MSC_VER) +# define XXH_PUBLIC_API static __inline +# else +# define XXH_PUBLIC_API static /* this version may generate warnings for unused static functions; disable the relevant warning */ +# endif +#else +# define XXH_PUBLIC_API /* do nothing */ +#endif /* XXH_PRIVATE_API */ + +/*!XXH_NAMESPACE, aka Namespace Emulation : + +If you want to include _and expose_ xxHash functions from within your own library, +but also want to avoid symbol collisions with another library which also includes xxHash, + +you can use XXH_NAMESPACE, to automatically prefix any public symbol from xxhash library +with the value of XXH_NAMESPACE (so avoid to keep it NULL and avoid numeric values). + +Note that no change is required within the calling program as long as it includes `xxhash.h` : +regular symbol name will be automatically translated by this header. +*/ +#ifdef XXH_NAMESPACE +# define XXH_CAT(A,B) A##B +# define XXH_NAME2(A,B) XXH_CAT(A,B) +# define XXH32 XXH_NAME2(XXH_NAMESPACE, XXH32) +# define XXH64 XXH_NAME2(XXH_NAMESPACE, XXH64) +# define XXH_versionNumber XXH_NAME2(XXH_NAMESPACE, XXH_versionNumber) +# define XXH32_createState XXH_NAME2(XXH_NAMESPACE, XXH32_createState) +# define XXH64_createState XXH_NAME2(XXH_NAMESPACE, XXH64_createState) +# define XXH32_freeState XXH_NAME2(XXH_NAMESPACE, XXH32_freeState) +# define XXH64_freeState XXH_NAME2(XXH_NAMESPACE, XXH64_freeState) +# define XXH32_reset XXH_NAME2(XXH_NAMESPACE, XXH32_reset) +# define XXH64_reset XXH_NAME2(XXH_NAMESPACE, XXH64_reset) +# define XXH32_update XXH_NAME2(XXH_NAMESPACE, XXH32_update) +# define XXH64_update XXH_NAME2(XXH_NAMESPACE, XXH64_update) +# define XXH32_digest XXH_NAME2(XXH_NAMESPACE, XXH32_digest) +# define XXH64_digest XXH_NAME2(XXH_NAMESPACE, XXH64_digest) +# define XXH32_copyState XXH_NAME2(XXH_NAMESPACE, XXH32_copyState) +# define XXH64_copyState XXH_NAME2(XXH_NAMESPACE, XXH64_copyState) +# define XXH32_canonicalFromHash XXH_NAME2(XXH_NAMESPACE, XXH32_canonicalFromHash) +# define XXH64_canonicalFromHash XXH_NAME2(XXH_NAMESPACE, XXH64_canonicalFromHash) +# define XXH32_hashFromCanonical XXH_NAME2(XXH_NAMESPACE, XXH32_hashFromCanonical) +# define XXH64_hashFromCanonical XXH_NAME2(XXH_NAMESPACE, XXH64_hashFromCanonical) +#endif + + +/* ************************************* +* Version +***************************************/ +#define XXH_VERSION_MAJOR 0 +#define XXH_VERSION_MINOR 6 +#define XXH_VERSION_RELEASE 2 +#define XXH_VERSION_NUMBER (XXH_VERSION_MAJOR *100*100 + XXH_VERSION_MINOR *100 + XXH_VERSION_RELEASE) +XXH_PUBLIC_API unsigned XXH_versionNumber (void); + + +/* **************************** +* Simple Hash Functions +******************************/ +typedef unsigned int XXH32_hash_t; +typedef unsigned long long XXH64_hash_t; + +XXH_PUBLIC_API XXH32_hash_t XXH32 (const void* input, size_t length, unsigned int seed); +XXH_PUBLIC_API XXH64_hash_t XXH64 (const void* input, size_t length, unsigned long long seed); + +/*! +XXH32() : + Calculate the 32-bits hash of sequence "length" bytes stored at memory address "input". + The memory between input & input+length must be valid (allocated and read-accessible). + "seed" can be used to alter the result predictably. + Speed on Core 2 Duo @ 3 GHz (single thread, SMHasher benchmark) : 5.4 GB/s +XXH64() : + Calculate the 64-bits hash of sequence of length "len" stored at memory address "input". + "seed" can be used to alter the result predictably. + This function runs 2x faster on 64-bits systems, but slower on 32-bits systems (see benchmark). +*/ + + +/* **************************** +* Streaming Hash Functions +******************************/ +typedef struct XXH32_state_s XXH32_state_t; /* incomplete type */ +typedef struct XXH64_state_s XXH64_state_t; /* incomplete type */ + +/*! State allocation, compatible with dynamic libraries */ + +XXH_PUBLIC_API XXH32_state_t* XXH32_createState(void); +XXH_PUBLIC_API XXH_errorcode XXH32_freeState(XXH32_state_t* statePtr); + +XXH_PUBLIC_API XXH64_state_t* XXH64_createState(void); +XXH_PUBLIC_API XXH_errorcode XXH64_freeState(XXH64_state_t* statePtr); + + +/* hash streaming */ + +XXH_PUBLIC_API XXH_errorcode XXH32_reset (XXH32_state_t* statePtr, unsigned int seed); +XXH_PUBLIC_API XXH_errorcode XXH32_update (XXH32_state_t* statePtr, const void* input, size_t length); +XXH_PUBLIC_API XXH32_hash_t XXH32_digest (const XXH32_state_t* statePtr); + +XXH_PUBLIC_API XXH_errorcode XXH64_reset (XXH64_state_t* statePtr, unsigned long long seed); +XXH_PUBLIC_API XXH_errorcode XXH64_update (XXH64_state_t* statePtr, const void* input, size_t length); +XXH_PUBLIC_API XXH64_hash_t XXH64_digest (const XXH64_state_t* statePtr); + +/* +These functions generate the xxHash of an input provided in multiple segments. +Note that, for small input, they are slower than single-call functions, due to state management. +For small input, prefer `XXH32()` and `XXH64()` . + +XXH state must first be allocated, using XXH*_createState() . + +Start a new hash by initializing state with a seed, using XXH*_reset(). + +Then, feed the hash state by calling XXH*_update() as many times as necessary. +Obviously, input must be allocated and read accessible. +The function returns an error code, with 0 meaning OK, and any other value meaning there is an error. + +Finally, a hash value can be produced anytime, by using XXH*_digest(). +This function returns the nn-bits hash as an int or long long. + +It's still possible to continue inserting input into the hash state after a digest, +and generate some new hashes later on, by calling again XXH*_digest(). + +When done, free XXH state space if it was allocated dynamically. +*/ + + +/* ************************** +* Utils +****************************/ +#if !(defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L)) /* ! C99 */ +# define restrict /* disable restrict */ +#endif + +XXH_PUBLIC_API void XXH32_copyState(XXH32_state_t* restrict dst_state, const XXH32_state_t* restrict src_state); +XXH_PUBLIC_API void XXH64_copyState(XXH64_state_t* restrict dst_state, const XXH64_state_t* restrict src_state); + + +/* ************************** +* Canonical representation +****************************/ +/* Default result type for XXH functions are primitive unsigned 32 and 64 bits. +* The canonical representation uses human-readable write convention, aka big-endian (large digits first). +* These functions allow transformation of hash result into and from its canonical format. +* This way, hash values can be written into a file / memory, and remain comparable on different systems and programs. +*/ +typedef struct { unsigned char digest[4]; } XXH32_canonical_t; +typedef struct { unsigned char digest[8]; } XXH64_canonical_t; + +XXH_PUBLIC_API void XXH32_canonicalFromHash(XXH32_canonical_t* dst, XXH32_hash_t hash); +XXH_PUBLIC_API void XXH64_canonicalFromHash(XXH64_canonical_t* dst, XXH64_hash_t hash); + +XXH_PUBLIC_API XXH32_hash_t XXH32_hashFromCanonical(const XXH32_canonical_t* src); +XXH_PUBLIC_API XXH64_hash_t XXH64_hashFromCanonical(const XXH64_canonical_t* src); + +#endif /* XXHASH_H_5627135585666179 */ + + + +/* ================================================================================================ + This section contains definitions which are not guaranteed to remain stable. + They may change in future versions, becoming incompatible with a different version of the library. + They shall only be used with static linking. + Never use these definitions in association with dynamic linking ! +=================================================================================================== */ +#if defined(XXH_STATIC_LINKING_ONLY) && !defined(XXH_STATIC_H_3543687687345) +#define XXH_STATIC_H_3543687687345 + +/* These definitions are only meant to allow allocation of XXH state + statically, on stack, or in a struct for example. + Do not use members directly. */ + + struct XXH32_state_s { + unsigned total_len_32; + unsigned large_len; + unsigned v1; + unsigned v2; + unsigned v3; + unsigned v4; + unsigned mem32[4]; /* buffer defined as U32 for alignment */ + unsigned memsize; + unsigned reserved; /* never read nor write, will be removed in a future version */ + }; /* typedef'd to XXH32_state_t */ + + struct XXH64_state_s { + unsigned long long total_len; + unsigned long long v1; + unsigned long long v2; + unsigned long long v3; + unsigned long long v4; + unsigned long long mem64[4]; /* buffer defined as U64 for alignment */ + unsigned memsize; + unsigned reserved[2]; /* never read nor write, will be removed in a future version */ + }; /* typedef'd to XXH64_state_t */ + + +# ifdef XXH_PRIVATE_API +# include "xxhash.c" /* include xxhash functions as `static`, for inlining */ +# endif + +#endif /* XXH_STATIC_LINKING_ONLY && XXH_STATIC_H_3543687687345 */ + + +#if defined (__cplusplus) +} +#endif diff --git a/external/zstd/lib/common/zstd_common.c b/external/zstd/lib/common/zstd_common.c new file mode 100644 index 00000000..3d7e35b3 --- /dev/null +++ b/external/zstd/lib/common/zstd_common.c @@ -0,0 +1,83 @@ +/* + * Copyright (c) Yann Collet, Facebook, Inc. + * All rights reserved. + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. + */ + + + +/*-************************************* +* Dependencies +***************************************/ +#define ZSTD_DEPS_NEED_MALLOC +#include "zstd_deps.h" /* ZSTD_malloc, ZSTD_calloc, ZSTD_free, ZSTD_memset */ +#include "error_private.h" +#include "zstd_internal.h" + + +/*-**************************************** +* Version +******************************************/ +unsigned ZSTD_versionNumber(void) { return ZSTD_VERSION_NUMBER; } + +const char* ZSTD_versionString(void) { return ZSTD_VERSION_STRING; } + + +/*-**************************************** +* ZSTD Error Management +******************************************/ +#undef ZSTD_isError /* defined within zstd_internal.h */ +/*! ZSTD_isError() : + * tells if a return value is an error code + * symbol is required for external callers */ +unsigned ZSTD_isError(size_t code) { return ERR_isError(code); } + +/*! ZSTD_getErrorName() : + * provides error code string from function result (useful for debugging) */ +const char* ZSTD_getErrorName(size_t code) { return ERR_getErrorName(code); } + +/*! ZSTD_getError() : + * convert a `size_t` function result into a proper ZSTD_errorCode enum */ +ZSTD_ErrorCode ZSTD_getErrorCode(size_t code) { return ERR_getErrorCode(code); } + +/*! ZSTD_getErrorString() : + * provides error code string from enum */ +const char* ZSTD_getErrorString(ZSTD_ErrorCode code) { return ERR_getErrorString(code); } + + + +/*=************************************************************** +* Custom allocator +****************************************************************/ +void* ZSTD_customMalloc(size_t size, ZSTD_customMem customMem) +{ + if (customMem.customAlloc) + return customMem.customAlloc(customMem.opaque, size); + return ZSTD_malloc(size); +} + +void* ZSTD_customCalloc(size_t size, ZSTD_customMem customMem) +{ + if (customMem.customAlloc) { + /* calloc implemented as malloc+memset; + * not as efficient as calloc, but next best guess for custom malloc */ + void* const ptr = customMem.customAlloc(customMem.opaque, size); + ZSTD_memset(ptr, 0, size); + return ptr; + } + return ZSTD_calloc(1, size); +} + +void ZSTD_customFree(void* ptr, ZSTD_customMem customMem) +{ + if (ptr!=NULL) { + if (customMem.customFree) + customMem.customFree(customMem.opaque, ptr); + else + ZSTD_free(ptr); + } +} diff --git a/external/zstd/lib/common/zstd_deps.h b/external/zstd/lib/common/zstd_deps.h new file mode 100644 index 00000000..14211344 --- /dev/null +++ b/external/zstd/lib/common/zstd_deps.h @@ -0,0 +1,111 @@ +/* + * Copyright (c) Facebook, Inc. + * All rights reserved. + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. + */ + +/* This file provides common libc dependencies that zstd requires. + * The purpose is to allow replacing this file with a custom implementation + * to compile zstd without libc support. + */ + +/* Need: + * NULL + * INT_MAX + * UINT_MAX + * ZSTD_memcpy() + * ZSTD_memset() + * ZSTD_memmove() + */ +#ifndef ZSTD_DEPS_COMMON +#define ZSTD_DEPS_COMMON + +#include +#include +#include + +#if defined(__GNUC__) && __GNUC__ >= 4 +# define ZSTD_memcpy(d,s,l) __builtin_memcpy((d),(s),(l)) +# define ZSTD_memmove(d,s,l) __builtin_memmove((d),(s),(l)) +# define ZSTD_memset(p,v,l) __builtin_memset((p),(v),(l)) +#else +# define ZSTD_memcpy(d,s,l) memcpy((d),(s),(l)) +# define ZSTD_memmove(d,s,l) memmove((d),(s),(l)) +# define ZSTD_memset(p,v,l) memset((p),(v),(l)) +#endif + +#endif /* ZSTD_DEPS_COMMON */ + +/* Need: + * ZSTD_malloc() + * ZSTD_free() + * ZSTD_calloc() + */ +#ifdef ZSTD_DEPS_NEED_MALLOC +#ifndef ZSTD_DEPS_MALLOC +#define ZSTD_DEPS_MALLOC + +#include + +#define ZSTD_malloc(s) malloc(s) +#define ZSTD_calloc(n,s) calloc((n), (s)) +#define ZSTD_free(p) free((p)) + +#endif /* ZSTD_DEPS_MALLOC */ +#endif /* ZSTD_DEPS_NEED_MALLOC */ + +/* + * Provides 64-bit math support. + * Need: + * U64 ZSTD_div64(U64 dividend, U32 divisor) + */ +#ifdef ZSTD_DEPS_NEED_MATH64 +#ifndef ZSTD_DEPS_MATH64 +#define ZSTD_DEPS_MATH64 + +#define ZSTD_div64(dividend, divisor) ((dividend) / (divisor)) + +#endif /* ZSTD_DEPS_MATH64 */ +#endif /* ZSTD_DEPS_NEED_MATH64 */ + +/* Need: + * assert() + */ +#ifdef ZSTD_DEPS_NEED_ASSERT +#ifndef ZSTD_DEPS_ASSERT +#define ZSTD_DEPS_ASSERT + +#include + +#endif /* ZSTD_DEPS_ASSERT */ +#endif /* ZSTD_DEPS_NEED_ASSERT */ + +/* Need: + * ZSTD_DEBUG_PRINT() + */ +#ifdef ZSTD_DEPS_NEED_IO +#ifndef ZSTD_DEPS_IO +#define ZSTD_DEPS_IO + +#include +#define ZSTD_DEBUG_PRINT(...) fprintf(stderr, __VA_ARGS__) + +#endif /* ZSTD_DEPS_IO */ +#endif /* ZSTD_DEPS_NEED_IO */ + +/* Only requested when is known to be present. + * Need: + * intptr_t + */ +#ifdef ZSTD_DEPS_NEED_STDINT +#ifndef ZSTD_DEPS_STDINT +#define ZSTD_DEPS_STDINT + +#include + +#endif /* ZSTD_DEPS_STDINT */ +#endif /* ZSTD_DEPS_NEED_STDINT */ diff --git a/external/zstd/lib/common/zstd_internal.h b/external/zstd/lib/common/zstd_internal.h new file mode 100644 index 00000000..68252e98 --- /dev/null +++ b/external/zstd/lib/common/zstd_internal.h @@ -0,0 +1,490 @@ +/* + * Copyright (c) Yann Collet, Facebook, Inc. + * All rights reserved. + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. + */ + +#ifndef ZSTD_CCOMMON_H_MODULE +#define ZSTD_CCOMMON_H_MODULE + +/* this module contains definitions which must be identical + * across compression, decompression and dictBuilder. + * It also contains a few functions useful to at least 2 of them + * and which benefit from being inlined */ + +/*-************************************* +* Dependencies +***************************************/ +#if !defined(ZSTD_NO_INTRINSICS) && defined(__ARM_NEON) +#include +#endif +#include "compiler.h" +#include "mem.h" +#include "debug.h" /* assert, DEBUGLOG, RAWLOG, g_debuglevel */ +#include "error_private.h" +#define ZSTD_STATIC_LINKING_ONLY +#include "../zstd.h" +#define FSE_STATIC_LINKING_ONLY +#include "fse.h" +#define HUF_STATIC_LINKING_ONLY +#include "huf.h" +#ifndef XXH_STATIC_LINKING_ONLY +# define XXH_STATIC_LINKING_ONLY /* XXH64_state_t */ +#endif +#include "xxhash.h" /* XXH_reset, update, digest */ +#ifndef ZSTD_NO_TRACE +# include "zstd_trace.h" +#else +# define ZSTD_TRACE 0 +#endif + +#if defined (__cplusplus) +extern "C" { +#endif + +/* ---- static assert (debug) --- */ +#define ZSTD_STATIC_ASSERT(c) DEBUG_STATIC_ASSERT(c) +#define ZSTD_isError ERR_isError /* for inlining */ +#define FSE_isError ERR_isError +#define HUF_isError ERR_isError + + +/*-************************************* +* shared macros +***************************************/ +#undef MIN +#undef MAX +#define MIN(a,b) ((a)<(b) ? (a) : (b)) +#define MAX(a,b) ((a)>(b) ? (a) : (b)) + +/** + * Ignore: this is an internal helper. + * + * This is a helper function to help force C99-correctness during compilation. + * Under strict compilation modes, variadic macro arguments can't be empty. + * However, variadic function arguments can be. Using a function therefore lets + * us statically check that at least one (string) argument was passed, + * independent of the compilation flags. + */ +static INLINE_KEYWORD UNUSED_ATTR +void _force_has_format_string(const char *format, ...) { + (void)format; +} + +/** + * Ignore: this is an internal helper. + * + * We want to force this function invocation to be syntactically correct, but + * we don't want to force runtime evaluation of its arguments. + */ +#define _FORCE_HAS_FORMAT_STRING(...) \ + if (0) { \ + _force_has_format_string(__VA_ARGS__); \ + } + +/** + * Return the specified error if the condition evaluates to true. + * + * In debug modes, prints additional information. + * In order to do that (particularly, printing the conditional that failed), + * this can't just wrap RETURN_ERROR(). + */ +#define RETURN_ERROR_IF(cond, err, ...) \ + if (cond) { \ + RAWLOG(3, "%s:%d: ERROR!: check %s failed, returning %s", \ + __FILE__, __LINE__, ZSTD_QUOTE(cond), ZSTD_QUOTE(ERROR(err))); \ + _FORCE_HAS_FORMAT_STRING(__VA_ARGS__); \ + RAWLOG(3, ": " __VA_ARGS__); \ + RAWLOG(3, "\n"); \ + return ERROR(err); \ + } + +/** + * Unconditionally return the specified error. + * + * In debug modes, prints additional information. + */ +#define RETURN_ERROR(err, ...) \ + do { \ + RAWLOG(3, "%s:%d: ERROR!: unconditional check failed, returning %s", \ + __FILE__, __LINE__, ZSTD_QUOTE(ERROR(err))); \ + _FORCE_HAS_FORMAT_STRING(__VA_ARGS__); \ + RAWLOG(3, ": " __VA_ARGS__); \ + RAWLOG(3, "\n"); \ + return ERROR(err); \ + } while(0); + +/** + * If the provided expression evaluates to an error code, returns that error code. + * + * In debug modes, prints additional information. + */ +#define FORWARD_IF_ERROR(err, ...) \ + do { \ + size_t const err_code = (err); \ + if (ERR_isError(err_code)) { \ + RAWLOG(3, "%s:%d: ERROR!: forwarding error in %s: %s", \ + __FILE__, __LINE__, ZSTD_QUOTE(err), ERR_getErrorName(err_code)); \ + _FORCE_HAS_FORMAT_STRING(__VA_ARGS__); \ + RAWLOG(3, ": " __VA_ARGS__); \ + RAWLOG(3, "\n"); \ + return err_code; \ + } \ + } while(0); + + +/*-************************************* +* Common constants +***************************************/ +#define ZSTD_OPT_NUM (1<<12) + +#define ZSTD_REP_NUM 3 /* number of repcodes */ +#define ZSTD_REP_MOVE (ZSTD_REP_NUM-1) +static UNUSED_ATTR const U32 repStartValue[ZSTD_REP_NUM] = { 1, 4, 8 }; + +#define KB *(1 <<10) +#define MB *(1 <<20) +#define GB *(1U<<30) + +#define BIT7 128 +#define BIT6 64 +#define BIT5 32 +#define BIT4 16 +#define BIT1 2 +#define BIT0 1 + +#define ZSTD_WINDOWLOG_ABSOLUTEMIN 10 +static UNUSED_ATTR const size_t ZSTD_fcs_fieldSize[4] = { 0, 2, 4, 8 }; +static UNUSED_ATTR const size_t ZSTD_did_fieldSize[4] = { 0, 1, 2, 4 }; + +#define ZSTD_FRAMEIDSIZE 4 /* magic number size */ + +#define ZSTD_BLOCKHEADERSIZE 3 /* C standard doesn't allow `static const` variable to be init using another `static const` variable */ +static UNUSED_ATTR const size_t ZSTD_blockHeaderSize = ZSTD_BLOCKHEADERSIZE; +typedef enum { bt_raw, bt_rle, bt_compressed, bt_reserved } blockType_e; + +#define ZSTD_FRAMECHECKSUMSIZE 4 + +#define MIN_SEQUENCES_SIZE 1 /* nbSeq==0 */ +#define MIN_CBLOCK_SIZE (1 /*litCSize*/ + 1 /* RLE or RAW */ + MIN_SEQUENCES_SIZE /* nbSeq==0 */) /* for a non-null block */ + +#define HufLog 12 +typedef enum { set_basic, set_rle, set_compressed, set_repeat } symbolEncodingType_e; + +#define LONGNBSEQ 0x7F00 + +#define MINMATCH 3 + +#define Litbits 8 +#define MaxLit ((1<= 8 || (ovtype == ZSTD_no_overlap && diff <= -WILDCOPY_VECLEN)); + + if (ovtype == ZSTD_overlap_src_before_dst && diff < WILDCOPY_VECLEN) { + /* Handle short offset copies. */ + do { + COPY8(op, ip) + } while (op < oend); + } else { + assert(diff >= WILDCOPY_VECLEN || diff <= -WILDCOPY_VECLEN); + /* Separate out the first COPY16() call because the copy length is + * almost certain to be short, so the branches have different + * probabilities. Since it is almost certain to be short, only do + * one COPY16() in the first call. Then, do two calls per loop since + * at that point it is more likely to have a high trip count. + */ +#ifdef __aarch64__ + do { + COPY16(op, ip); + } + while (op < oend); +#else + ZSTD_copy16(op, ip); + if (16 >= length) return; + op += 16; + ip += 16; + do { + COPY16(op, ip); + COPY16(op, ip); + } + while (op < oend); +#endif + } +} + +MEM_STATIC size_t ZSTD_limitCopy(void* dst, size_t dstCapacity, const void* src, size_t srcSize) +{ + size_t const length = MIN(dstCapacity, srcSize); + if (length > 0) { + ZSTD_memcpy(dst, src, length); + } + return length; +} + +/* define "workspace is too large" as this number of times larger than needed */ +#define ZSTD_WORKSPACETOOLARGE_FACTOR 3 + +/* when workspace is continuously too large + * during at least this number of times, + * context's memory usage is considered wasteful, + * because it's sized to handle a worst case scenario which rarely happens. + * In which case, resize it down to free some memory */ +#define ZSTD_WORKSPACETOOLARGE_MAXDURATION 128 + +/* Controls whether the input/output buffer is buffered or stable. */ +typedef enum { + ZSTD_bm_buffered = 0, /* Buffer the input/output */ + ZSTD_bm_stable = 1 /* ZSTD_inBuffer/ZSTD_outBuffer is stable */ +} ZSTD_bufferMode_e; + + +/*-******************************************* +* Private declarations +*********************************************/ +typedef struct seqDef_s { + U32 offset; /* offset == rawOffset + ZSTD_REP_NUM, or equivalently, offCode + 1 */ + U16 litLength; + U16 matchLength; +} seqDef; + +/* Controls whether seqStore has a single "long" litLength or matchLength. See seqStore_t. */ +typedef enum { + ZSTD_llt_none = 0, /* no longLengthType */ + ZSTD_llt_literalLength = 1, /* represents a long literal */ + ZSTD_llt_matchLength = 2 /* represents a long match */ +} ZSTD_longLengthType_e; + +typedef struct { + seqDef* sequencesStart; + seqDef* sequences; /* ptr to end of sequences */ + BYTE* litStart; + BYTE* lit; /* ptr to end of literals */ + BYTE* llCode; + BYTE* mlCode; + BYTE* ofCode; + size_t maxNbSeq; + size_t maxNbLit; + + /* longLengthPos and longLengthType to allow us to represent either a single litLength or matchLength + * in the seqStore that has a value larger than U16 (if it exists). To do so, we increment + * the existing value of the litLength or matchLength by 0x10000. + */ + ZSTD_longLengthType_e longLengthType; + U32 longLengthPos; /* Index of the sequence to apply long length modification to */ +} seqStore_t; + +typedef struct { + U32 litLength; + U32 matchLength; +} ZSTD_sequenceLength; + +/** + * Returns the ZSTD_sequenceLength for the given sequences. It handles the decoding of long sequences + * indicated by longLengthPos and longLengthType, and adds MINMATCH back to matchLength. + */ +MEM_STATIC ZSTD_sequenceLength ZSTD_getSequenceLength(seqStore_t const* seqStore, seqDef const* seq) +{ + ZSTD_sequenceLength seqLen; + seqLen.litLength = seq->litLength; + seqLen.matchLength = seq->matchLength + MINMATCH; + if (seqStore->longLengthPos == (U32)(seq - seqStore->sequencesStart)) { + if (seqStore->longLengthType == ZSTD_llt_literalLength) { + seqLen.litLength += 0xFFFF; + } + if (seqStore->longLengthType == ZSTD_llt_matchLength) { + seqLen.matchLength += 0xFFFF; + } + } + return seqLen; +} + +/** + * Contains the compressed frame size and an upper-bound for the decompressed frame size. + * Note: before using `compressedSize`, check for errors using ZSTD_isError(). + * similarly, before using `decompressedBound`, check for errors using: + * `decompressedBound != ZSTD_CONTENTSIZE_ERROR` + */ +typedef struct { + size_t compressedSize; + unsigned long long decompressedBound; +} ZSTD_frameSizeInfo; /* decompress & legacy */ + +const seqStore_t* ZSTD_getSeqStore(const ZSTD_CCtx* ctx); /* compress & dictBuilder */ +void ZSTD_seqToCodes(const seqStore_t* seqStorePtr); /* compress, dictBuilder, decodeCorpus (shouldn't get its definition from here) */ + +/* custom memory allocation functions */ +void* ZSTD_customMalloc(size_t size, ZSTD_customMem customMem); +void* ZSTD_customCalloc(size_t size, ZSTD_customMem customMem); +void ZSTD_customFree(void* ptr, ZSTD_customMem customMem); + + +MEM_STATIC U32 ZSTD_highbit32(U32 val) /* compress, dictBuilder, decodeCorpus */ +{ + assert(val != 0); + { +# if defined(_MSC_VER) /* Visual */ +# if STATIC_BMI2 == 1 + return _lzcnt_u32(val)^31; +# else + unsigned long r=0; + return _BitScanReverse(&r, val) ? (unsigned)r : 0; +# endif +# elif defined(__GNUC__) && (__GNUC__ >= 3) /* GCC Intrinsic */ + return __builtin_clz (val) ^ 31; +# elif defined(__ICCARM__) /* IAR Intrinsic */ + return 31 - __CLZ(val); +# else /* Software version */ + static const U32 DeBruijnClz[32] = { 0, 9, 1, 10, 13, 21, 2, 29, 11, 14, 16, 18, 22, 25, 3, 30, 8, 12, 20, 28, 15, 17, 24, 7, 19, 27, 23, 6, 26, 5, 4, 31 }; + U32 v = val; + v |= v >> 1; + v |= v >> 2; + v |= v >> 4; + v |= v >> 8; + v |= v >> 16; + return DeBruijnClz[(v * 0x07C4ACDDU) >> 27]; +# endif + } +} + + +/* ZSTD_invalidateRepCodes() : + * ensures next compression will not use repcodes from previous block. + * Note : only works with regular variant; + * do not use with extDict variant ! */ +void ZSTD_invalidateRepCodes(ZSTD_CCtx* cctx); /* zstdmt, adaptive_compression (shouldn't get this definition from here) */ + + +typedef struct { + blockType_e blockType; + U32 lastBlock; + U32 origSize; +} blockProperties_t; /* declared here for decompress and fullbench */ + +/*! ZSTD_getcBlockSize() : + * Provides the size of compressed block from block header `src` */ +/* Used by: decompress, fullbench (does not get its definition from here) */ +size_t ZSTD_getcBlockSize(const void* src, size_t srcSize, + blockProperties_t* bpPtr); + +/*! ZSTD_decodeSeqHeaders() : + * decode sequence header from src */ +/* Used by: decompress, fullbench (does not get its definition from here) */ +size_t ZSTD_decodeSeqHeaders(ZSTD_DCtx* dctx, int* nbSeqPtr, + const void* src, size_t srcSize); + + +#if defined (__cplusplus) +} +#endif + +#endif /* ZSTD_CCOMMON_H_MODULE */ diff --git a/external/zstd/lib/common/zstd_trace.h b/external/zstd/lib/common/zstd_trace.h new file mode 100644 index 00000000..2da56407 --- /dev/null +++ b/external/zstd/lib/common/zstd_trace.h @@ -0,0 +1,154 @@ +/* + * Copyright (c) Facebook, Inc. + * All rights reserved. + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. + */ + +#ifndef ZSTD_TRACE_H +#define ZSTD_TRACE_H + +#if defined (__cplusplus) +extern "C" { +#endif + +#include + +/* weak symbol support */ +#if !defined(ZSTD_HAVE_WEAK_SYMBOLS) && defined(__GNUC__) && \ + !defined(__APPLE__) && !defined(_WIN32) && !defined(__MINGW32__) && \ + !defined(__CYGWIN__) +# define ZSTD_HAVE_WEAK_SYMBOLS 1 +#else +# define ZSTD_HAVE_WEAK_SYMBOLS 0 +#endif +#if ZSTD_HAVE_WEAK_SYMBOLS +# define ZSTD_WEAK_ATTR __attribute__((__weak__)) +#else +# define ZSTD_WEAK_ATTR +#endif + +/* Only enable tracing when weak symbols are available. */ +#ifndef ZSTD_TRACE +# define ZSTD_TRACE ZSTD_HAVE_WEAK_SYMBOLS +#endif + +#if ZSTD_TRACE + +struct ZSTD_CCtx_s; +struct ZSTD_DCtx_s; +struct ZSTD_CCtx_params_s; + +typedef struct { + /** + * ZSTD_VERSION_NUMBER + * + * This is guaranteed to be the first member of ZSTD_trace. + * Otherwise, this struct is not stable between versions. If + * the version number does not match your expectation, you + * should not interpret the rest of the struct. + */ + unsigned version; + /** + * Non-zero if streaming (de)compression is used. + */ + unsigned streaming; + /** + * The dictionary ID. + */ + unsigned dictionaryID; + /** + * Is the dictionary cold? + * Only set on decompression. + */ + unsigned dictionaryIsCold; + /** + * The dictionary size or zero if no dictionary. + */ + size_t dictionarySize; + /** + * The uncompressed size of the data. + */ + size_t uncompressedSize; + /** + * The compressed size of the data. + */ + size_t compressedSize; + /** + * The fully resolved CCtx parameters (NULL on decompression). + */ + struct ZSTD_CCtx_params_s const* params; + /** + * The ZSTD_CCtx pointer (NULL on decompression). + */ + struct ZSTD_CCtx_s const* cctx; + /** + * The ZSTD_DCtx pointer (NULL on compression). + */ + struct ZSTD_DCtx_s const* dctx; +} ZSTD_Trace; + +/** + * A tracing context. It must be 0 when tracing is disabled. + * Otherwise, any non-zero value returned by a tracing begin() + * function is presented to any subsequent calls to end(). + * + * Any non-zero value is treated as tracing is enabled and not + * interpreted by the library. + * + * Two possible uses are: + * * A timestamp for when the begin() function was called. + * * A unique key identifying the (de)compression, like the + * address of the [dc]ctx pointer if you need to track + * more information than just a timestamp. + */ +typedef unsigned long long ZSTD_TraceCtx; + +/** + * Trace the beginning of a compression call. + * @param cctx The dctx pointer for the compression. + * It can be used as a key to map begin() to end(). + * @returns Non-zero if tracing is enabled. The return value is + * passed to ZSTD_trace_compress_end(). + */ +ZSTD_WEAK_ATTR ZSTD_TraceCtx ZSTD_trace_compress_begin( + struct ZSTD_CCtx_s const* cctx); + +/** + * Trace the end of a compression call. + * @param ctx The return value of ZSTD_trace_compress_begin(). + * @param trace The zstd tracing info. + */ +ZSTD_WEAK_ATTR void ZSTD_trace_compress_end( + ZSTD_TraceCtx ctx, + ZSTD_Trace const* trace); + +/** + * Trace the beginning of a decompression call. + * @param dctx The dctx pointer for the decompression. + * It can be used as a key to map begin() to end(). + * @returns Non-zero if tracing is enabled. The return value is + * passed to ZSTD_trace_compress_end(). + */ +ZSTD_WEAK_ATTR ZSTD_TraceCtx ZSTD_trace_decompress_begin( + struct ZSTD_DCtx_s const* dctx); + +/** + * Trace the end of a decompression call. + * @param ctx The return value of ZSTD_trace_decompress_begin(). + * @param trace The zstd tracing info. + */ +ZSTD_WEAK_ATTR void ZSTD_trace_decompress_end( + ZSTD_TraceCtx ctx, + ZSTD_Trace const* trace); + +#endif /* ZSTD_TRACE */ + +#if defined (__cplusplus) +} +#endif + +#endif /* ZSTD_TRACE_H */ diff --git a/external/zstd/lib/compress/clevels.h b/external/zstd/lib/compress/clevels.h new file mode 100644 index 00000000..7ed2e004 --- /dev/null +++ b/external/zstd/lib/compress/clevels.h @@ -0,0 +1,134 @@ +/* + * Copyright (c) Yann Collet, Facebook, Inc. + * All rights reserved. + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. + */ + +#ifndef ZSTD_CLEVELS_H +#define ZSTD_CLEVELS_H + +#define ZSTD_STATIC_LINKING_ONLY /* ZSTD_compressionParameters */ +#include "../zstd.h" + +/*-===== Pre-defined compression levels =====-*/ + +#define ZSTD_MAX_CLEVEL 22 + +#ifdef __GNUC__ +__attribute__((__unused__)) +#endif + +static const ZSTD_compressionParameters ZSTD_defaultCParameters[4][ZSTD_MAX_CLEVEL+1] = { +{ /* "default" - for any srcSize > 256 KB */ + /* W, C, H, S, L, TL, strat */ + { 19, 12, 13, 1, 6, 1, ZSTD_fast }, /* base for negative levels */ + { 19, 13, 14, 1, 7, 0, ZSTD_fast }, /* level 1 */ + { 20, 15, 16, 1, 6, 0, ZSTD_fast }, /* level 2 */ + { 21, 16, 17, 1, 5, 0, ZSTD_dfast }, /* level 3 */ + { 21, 18, 18, 1, 5, 0, ZSTD_dfast }, /* level 4 */ + { 21, 18, 19, 3, 5, 2, ZSTD_greedy }, /* level 5 */ + { 21, 18, 19, 3, 5, 4, ZSTD_lazy }, /* level 6 */ + { 21, 19, 20, 4, 5, 8, ZSTD_lazy }, /* level 7 */ + { 21, 19, 20, 4, 5, 16, ZSTD_lazy2 }, /* level 8 */ + { 22, 20, 21, 4, 5, 16, ZSTD_lazy2 }, /* level 9 */ + { 22, 21, 22, 5, 5, 16, ZSTD_lazy2 }, /* level 10 */ + { 22, 21, 22, 6, 5, 16, ZSTD_lazy2 }, /* level 11 */ + { 22, 22, 23, 6, 5, 32, ZSTD_lazy2 }, /* level 12 */ + { 22, 22, 22, 4, 5, 32, ZSTD_btlazy2 }, /* level 13 */ + { 22, 22, 23, 5, 5, 32, ZSTD_btlazy2 }, /* level 14 */ + { 22, 23, 23, 6, 5, 32, ZSTD_btlazy2 }, /* level 15 */ + { 22, 22, 22, 5, 5, 48, ZSTD_btopt }, /* level 16 */ + { 23, 23, 22, 5, 4, 64, ZSTD_btopt }, /* level 17 */ + { 23, 23, 22, 6, 3, 64, ZSTD_btultra }, /* level 18 */ + { 23, 24, 22, 7, 3,256, ZSTD_btultra2}, /* level 19 */ + { 25, 25, 23, 7, 3,256, ZSTD_btultra2}, /* level 20 */ + { 26, 26, 24, 7, 3,512, ZSTD_btultra2}, /* level 21 */ + { 27, 27, 25, 9, 3,999, ZSTD_btultra2}, /* level 22 */ +}, +{ /* for srcSize <= 256 KB */ + /* W, C, H, S, L, T, strat */ + { 18, 12, 13, 1, 5, 1, ZSTD_fast }, /* base for negative levels */ + { 18, 13, 14, 1, 6, 0, ZSTD_fast }, /* level 1 */ + { 18, 14, 14, 1, 5, 0, ZSTD_dfast }, /* level 2 */ + { 18, 16, 16, 1, 4, 0, ZSTD_dfast }, /* level 3 */ + { 18, 16, 17, 3, 5, 2, ZSTD_greedy }, /* level 4.*/ + { 18, 17, 18, 5, 5, 2, ZSTD_greedy }, /* level 5.*/ + { 18, 18, 19, 3, 5, 4, ZSTD_lazy }, /* level 6.*/ + { 18, 18, 19, 4, 4, 4, ZSTD_lazy }, /* level 7 */ + { 18, 18, 19, 4, 4, 8, ZSTD_lazy2 }, /* level 8 */ + { 18, 18, 19, 5, 4, 8, ZSTD_lazy2 }, /* level 9 */ + { 18, 18, 19, 6, 4, 8, ZSTD_lazy2 }, /* level 10 */ + { 18, 18, 19, 5, 4, 12, ZSTD_btlazy2 }, /* level 11.*/ + { 18, 19, 19, 7, 4, 12, ZSTD_btlazy2 }, /* level 12.*/ + { 18, 18, 19, 4, 4, 16, ZSTD_btopt }, /* level 13 */ + { 18, 18, 19, 4, 3, 32, ZSTD_btopt }, /* level 14.*/ + { 18, 18, 19, 6, 3,128, ZSTD_btopt }, /* level 15.*/ + { 18, 19, 19, 6, 3,128, ZSTD_btultra }, /* level 16.*/ + { 18, 19, 19, 8, 3,256, ZSTD_btultra }, /* level 17.*/ + { 18, 19, 19, 6, 3,128, ZSTD_btultra2}, /* level 18.*/ + { 18, 19, 19, 8, 3,256, ZSTD_btultra2}, /* level 19.*/ + { 18, 19, 19, 10, 3,512, ZSTD_btultra2}, /* level 20.*/ + { 18, 19, 19, 12, 3,512, ZSTD_btultra2}, /* level 21.*/ + { 18, 19, 19, 13, 3,999, ZSTD_btultra2}, /* level 22.*/ +}, +{ /* for srcSize <= 128 KB */ + /* W, C, H, S, L, T, strat */ + { 17, 12, 12, 1, 5, 1, ZSTD_fast }, /* base for negative levels */ + { 17, 12, 13, 1, 6, 0, ZSTD_fast }, /* level 1 */ + { 17, 13, 15, 1, 5, 0, ZSTD_fast }, /* level 2 */ + { 17, 15, 16, 2, 5, 0, ZSTD_dfast }, /* level 3 */ + { 17, 17, 17, 2, 4, 0, ZSTD_dfast }, /* level 4 */ + { 17, 16, 17, 3, 4, 2, ZSTD_greedy }, /* level 5 */ + { 17, 16, 17, 3, 4, 4, ZSTD_lazy }, /* level 6 */ + { 17, 16, 17, 3, 4, 8, ZSTD_lazy2 }, /* level 7 */ + { 17, 16, 17, 4, 4, 8, ZSTD_lazy2 }, /* level 8 */ + { 17, 16, 17, 5, 4, 8, ZSTD_lazy2 }, /* level 9 */ + { 17, 16, 17, 6, 4, 8, ZSTD_lazy2 }, /* level 10 */ + { 17, 17, 17, 5, 4, 8, ZSTD_btlazy2 }, /* level 11 */ + { 17, 18, 17, 7, 4, 12, ZSTD_btlazy2 }, /* level 12 */ + { 17, 18, 17, 3, 4, 12, ZSTD_btopt }, /* level 13.*/ + { 17, 18, 17, 4, 3, 32, ZSTD_btopt }, /* level 14.*/ + { 17, 18, 17, 6, 3,256, ZSTD_btopt }, /* level 15.*/ + { 17, 18, 17, 6, 3,128, ZSTD_btultra }, /* level 16.*/ + { 17, 18, 17, 8, 3,256, ZSTD_btultra }, /* level 17.*/ + { 17, 18, 17, 10, 3,512, ZSTD_btultra }, /* level 18.*/ + { 17, 18, 17, 5, 3,256, ZSTD_btultra2}, /* level 19.*/ + { 17, 18, 17, 7, 3,512, ZSTD_btultra2}, /* level 20.*/ + { 17, 18, 17, 9, 3,512, ZSTD_btultra2}, /* level 21.*/ + { 17, 18, 17, 11, 3,999, ZSTD_btultra2}, /* level 22.*/ +}, +{ /* for srcSize <= 16 KB */ + /* W, C, H, S, L, T, strat */ + { 14, 12, 13, 1, 5, 1, ZSTD_fast }, /* base for negative levels */ + { 14, 14, 15, 1, 5, 0, ZSTD_fast }, /* level 1 */ + { 14, 14, 15, 1, 4, 0, ZSTD_fast }, /* level 2 */ + { 14, 14, 15, 2, 4, 0, ZSTD_dfast }, /* level 3 */ + { 14, 14, 14, 4, 4, 2, ZSTD_greedy }, /* level 4 */ + { 14, 14, 14, 3, 4, 4, ZSTD_lazy }, /* level 5.*/ + { 14, 14, 14, 4, 4, 8, ZSTD_lazy2 }, /* level 6 */ + { 14, 14, 14, 6, 4, 8, ZSTD_lazy2 }, /* level 7 */ + { 14, 14, 14, 8, 4, 8, ZSTD_lazy2 }, /* level 8.*/ + { 14, 15, 14, 5, 4, 8, ZSTD_btlazy2 }, /* level 9.*/ + { 14, 15, 14, 9, 4, 8, ZSTD_btlazy2 }, /* level 10.*/ + { 14, 15, 14, 3, 4, 12, ZSTD_btopt }, /* level 11.*/ + { 14, 15, 14, 4, 3, 24, ZSTD_btopt }, /* level 12.*/ + { 14, 15, 14, 5, 3, 32, ZSTD_btultra }, /* level 13.*/ + { 14, 15, 15, 6, 3, 64, ZSTD_btultra }, /* level 14.*/ + { 14, 15, 15, 7, 3,256, ZSTD_btultra }, /* level 15.*/ + { 14, 15, 15, 5, 3, 48, ZSTD_btultra2}, /* level 16.*/ + { 14, 15, 15, 6, 3,128, ZSTD_btultra2}, /* level 17.*/ + { 14, 15, 15, 7, 3,256, ZSTD_btultra2}, /* level 18.*/ + { 14, 15, 15, 8, 3,256, ZSTD_btultra2}, /* level 19.*/ + { 14, 15, 15, 8, 3,512, ZSTD_btultra2}, /* level 20.*/ + { 14, 15, 15, 9, 3,512, ZSTD_btultra2}, /* level 21.*/ + { 14, 15, 15, 10, 3,999, ZSTD_btultra2}, /* level 22.*/ +}, +}; + + + +#endif /* ZSTD_CLEVELS_H */ diff --git a/external/zstd/lib/compress/fse_compress.c b/external/zstd/lib/compress/fse_compress.c new file mode 100644 index 00000000..b4297ec8 --- /dev/null +++ b/external/zstd/lib/compress/fse_compress.c @@ -0,0 +1,705 @@ +/* ****************************************************************** + * FSE : Finite State Entropy encoder + * Copyright (c) Yann Collet, Facebook, Inc. + * + * You can contact the author at : + * - FSE source repository : https://github.com/Cyan4973/FiniteStateEntropy + * - Public forum : https://groups.google.com/forum/#!forum/lz4c + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. +****************************************************************** */ + +/* ************************************************************** +* Includes +****************************************************************/ +#include "../common/compiler.h" +#include "../common/mem.h" /* U32, U16, etc. */ +#include "../common/debug.h" /* assert, DEBUGLOG */ +#include "hist.h" /* HIST_count_wksp */ +#include "../common/bitstream.h" +#define FSE_STATIC_LINKING_ONLY +#include "../common/fse.h" +#include "../common/error_private.h" +#define ZSTD_DEPS_NEED_MALLOC +#define ZSTD_DEPS_NEED_MATH64 +#include "../common/zstd_deps.h" /* ZSTD_malloc, ZSTD_free, ZSTD_memcpy, ZSTD_memset */ + + +/* ************************************************************** +* Error Management +****************************************************************/ +#define FSE_isError ERR_isError + + +/* ************************************************************** +* Templates +****************************************************************/ +/* + designed to be included + for type-specific functions (template emulation in C) + Objective is to write these functions only once, for improved maintenance +*/ + +/* safety checks */ +#ifndef FSE_FUNCTION_EXTENSION +# error "FSE_FUNCTION_EXTENSION must be defined" +#endif +#ifndef FSE_FUNCTION_TYPE +# error "FSE_FUNCTION_TYPE must be defined" +#endif + +/* Function names */ +#define FSE_CAT(X,Y) X##Y +#define FSE_FUNCTION_NAME(X,Y) FSE_CAT(X,Y) +#define FSE_TYPE_NAME(X,Y) FSE_CAT(X,Y) + + +/* Function templates */ + +/* FSE_buildCTable_wksp() : + * Same as FSE_buildCTable(), but using an externally allocated scratch buffer (`workSpace`). + * wkspSize should be sized to handle worst case situation, which is `1<>1 : 1) ; + FSE_symbolCompressionTransform* const symbolTT = (FSE_symbolCompressionTransform*) (FSCT); + U32 const step = FSE_TABLESTEP(tableSize); + + U32* cumul = (U32*)workSpace; + FSE_FUNCTION_TYPE* tableSymbol = (FSE_FUNCTION_TYPE*)(cumul + (maxSymbolValue + 2)); + + U32 highThreshold = tableSize-1; + + if ((size_t)workSpace & 3) return ERROR(GENERIC); /* Must be 4 byte aligned */ + if (FSE_BUILD_CTABLE_WORKSPACE_SIZE(maxSymbolValue, tableLog) > wkspSize) return ERROR(tableLog_tooLarge); + /* CTable header */ + tableU16[-2] = (U16) tableLog; + tableU16[-1] = (U16) maxSymbolValue; + assert(tableLog < 16); /* required for threshold strategy to work */ + + /* For explanations on how to distribute symbol values over the table : + * http://fastcompression.blogspot.fr/2014/02/fse-distributing-symbol-values.html */ + + #ifdef __clang_analyzer__ + ZSTD_memset(tableSymbol, 0, sizeof(*tableSymbol) * tableSize); /* useless initialization, just to keep scan-build happy */ + #endif + + /* symbol start positions */ + { U32 u; + cumul[0] = 0; + for (u=1; u <= maxSymbolValue+1; u++) { + if (normalizedCounter[u-1]==-1) { /* Low proba symbol */ + cumul[u] = cumul[u-1] + 1; + tableSymbol[highThreshold--] = (FSE_FUNCTION_TYPE)(u-1); + } else { + cumul[u] = cumul[u-1] + normalizedCounter[u-1]; + } } + cumul[maxSymbolValue+1] = tableSize+1; + } + + /* Spread symbols */ + { U32 position = 0; + U32 symbol; + for (symbol=0; symbol<=maxSymbolValue; symbol++) { + int nbOccurrences; + int const freq = normalizedCounter[symbol]; + for (nbOccurrences=0; nbOccurrences highThreshold) + position = (position + step) & tableMask; /* Low proba area */ + } } + + assert(position==0); /* Must have initialized all positions */ + } + + /* Build table */ + { U32 u; for (u=0; u> 3) + 3; + return maxSymbolValue ? maxHeaderSize : FSE_NCOUNTBOUND; /* maxSymbolValue==0 ? use default */ +} + +static size_t +FSE_writeNCount_generic (void* header, size_t headerBufferSize, + const short* normalizedCounter, unsigned maxSymbolValue, unsigned tableLog, + unsigned writeIsSafe) +{ + BYTE* const ostart = (BYTE*) header; + BYTE* out = ostart; + BYTE* const oend = ostart + headerBufferSize; + int nbBits; + const int tableSize = 1 << tableLog; + int remaining; + int threshold; + U32 bitStream = 0; + int bitCount = 0; + unsigned symbol = 0; + unsigned const alphabetSize = maxSymbolValue + 1; + int previousIs0 = 0; + + /* Table Size */ + bitStream += (tableLog-FSE_MIN_TABLELOG) << bitCount; + bitCount += 4; + + /* Init */ + remaining = tableSize+1; /* +1 for extra accuracy */ + threshold = tableSize; + nbBits = tableLog+1; + + while ((symbol < alphabetSize) && (remaining>1)) { /* stops at 1 */ + if (previousIs0) { + unsigned start = symbol; + while ((symbol < alphabetSize) && !normalizedCounter[symbol]) symbol++; + if (symbol == alphabetSize) break; /* incorrect distribution */ + while (symbol >= start+24) { + start+=24; + bitStream += 0xFFFFU << bitCount; + if ((!writeIsSafe) && (out > oend-2)) + return ERROR(dstSize_tooSmall); /* Buffer overflow */ + out[0] = (BYTE) bitStream; + out[1] = (BYTE)(bitStream>>8); + out+=2; + bitStream>>=16; + } + while (symbol >= start+3) { + start+=3; + bitStream += 3 << bitCount; + bitCount += 2; + } + bitStream += (symbol-start) << bitCount; + bitCount += 2; + if (bitCount>16) { + if ((!writeIsSafe) && (out > oend - 2)) + return ERROR(dstSize_tooSmall); /* Buffer overflow */ + out[0] = (BYTE)bitStream; + out[1] = (BYTE)(bitStream>>8); + out += 2; + bitStream >>= 16; + bitCount -= 16; + } } + { int count = normalizedCounter[symbol++]; + int const max = (2*threshold-1) - remaining; + remaining -= count < 0 ? -count : count; + count++; /* +1 for extra accuracy */ + if (count>=threshold) + count += max; /* [0..max[ [max..threshold[ (...) [threshold+max 2*threshold[ */ + bitStream += count << bitCount; + bitCount += nbBits; + bitCount -= (count>=1; } + } + if (bitCount>16) { + if ((!writeIsSafe) && (out > oend - 2)) + return ERROR(dstSize_tooSmall); /* Buffer overflow */ + out[0] = (BYTE)bitStream; + out[1] = (BYTE)(bitStream>>8); + out += 2; + bitStream >>= 16; + bitCount -= 16; + } } + + if (remaining != 1) + return ERROR(GENERIC); /* incorrect normalized distribution */ + assert(symbol <= alphabetSize); + + /* flush remaining bitStream */ + if ((!writeIsSafe) && (out > oend - 2)) + return ERROR(dstSize_tooSmall); /* Buffer overflow */ + out[0] = (BYTE)bitStream; + out[1] = (BYTE)(bitStream>>8); + out+= (bitCount+7) /8; + + return (out-ostart); +} + + +size_t FSE_writeNCount (void* buffer, size_t bufferSize, + const short* normalizedCounter, unsigned maxSymbolValue, unsigned tableLog) +{ + if (tableLog > FSE_MAX_TABLELOG) return ERROR(tableLog_tooLarge); /* Unsupported */ + if (tableLog < FSE_MIN_TABLELOG) return ERROR(GENERIC); /* Unsupported */ + + if (bufferSize < FSE_NCountWriteBound(maxSymbolValue, tableLog)) + return FSE_writeNCount_generic(buffer, bufferSize, normalizedCounter, maxSymbolValue, tableLog, 0); + + return FSE_writeNCount_generic(buffer, bufferSize, normalizedCounter, maxSymbolValue, tableLog, 1 /* write in buffer is safe */); +} + + +/*-************************************************************** +* FSE Compression Code +****************************************************************/ + +FSE_CTable* FSE_createCTable (unsigned maxSymbolValue, unsigned tableLog) +{ + size_t size; + if (tableLog > FSE_TABLELOG_ABSOLUTE_MAX) tableLog = FSE_TABLELOG_ABSOLUTE_MAX; + size = FSE_CTABLE_SIZE_U32 (tableLog, maxSymbolValue) * sizeof(U32); + return (FSE_CTable*)ZSTD_malloc(size); +} + +void FSE_freeCTable (FSE_CTable* ct) { ZSTD_free(ct); } + +/* provides the minimum logSize to safely represent a distribution */ +static unsigned FSE_minTableLog(size_t srcSize, unsigned maxSymbolValue) +{ + U32 minBitsSrc = BIT_highbit32((U32)(srcSize)) + 1; + U32 minBitsSymbols = BIT_highbit32(maxSymbolValue) + 2; + U32 minBits = minBitsSrc < minBitsSymbols ? minBitsSrc : minBitsSymbols; + assert(srcSize > 1); /* Not supported, RLE should be used instead */ + return minBits; +} + +unsigned FSE_optimalTableLog_internal(unsigned maxTableLog, size_t srcSize, unsigned maxSymbolValue, unsigned minus) +{ + U32 maxBitsSrc = BIT_highbit32((U32)(srcSize - 1)) - minus; + U32 tableLog = maxTableLog; + U32 minBits = FSE_minTableLog(srcSize, maxSymbolValue); + assert(srcSize > 1); /* Not supported, RLE should be used instead */ + if (tableLog==0) tableLog = FSE_DEFAULT_TABLELOG; + if (maxBitsSrc < tableLog) tableLog = maxBitsSrc; /* Accuracy can be reduced */ + if (minBits > tableLog) tableLog = minBits; /* Need a minimum to safely represent all symbol values */ + if (tableLog < FSE_MIN_TABLELOG) tableLog = FSE_MIN_TABLELOG; + if (tableLog > FSE_MAX_TABLELOG) tableLog = FSE_MAX_TABLELOG; + return tableLog; +} + +unsigned FSE_optimalTableLog(unsigned maxTableLog, size_t srcSize, unsigned maxSymbolValue) +{ + return FSE_optimalTableLog_internal(maxTableLog, srcSize, maxSymbolValue, 2); +} + +/* Secondary normalization method. + To be used when primary method fails. */ + +static size_t FSE_normalizeM2(short* norm, U32 tableLog, const unsigned* count, size_t total, U32 maxSymbolValue, short lowProbCount) +{ + short const NOT_YET_ASSIGNED = -2; + U32 s; + U32 distributed = 0; + U32 ToDistribute; + + /* Init */ + U32 const lowThreshold = (U32)(total >> tableLog); + U32 lowOne = (U32)((total * 3) >> (tableLog + 1)); + + for (s=0; s<=maxSymbolValue; s++) { + if (count[s] == 0) { + norm[s]=0; + continue; + } + if (count[s] <= lowThreshold) { + norm[s] = lowProbCount; + distributed++; + total -= count[s]; + continue; + } + if (count[s] <= lowOne) { + norm[s] = 1; + distributed++; + total -= count[s]; + continue; + } + + norm[s]=NOT_YET_ASSIGNED; + } + ToDistribute = (1 << tableLog) - distributed; + + if (ToDistribute == 0) + return 0; + + if ((total / ToDistribute) > lowOne) { + /* risk of rounding to zero */ + lowOne = (U32)((total * 3) / (ToDistribute * 2)); + for (s=0; s<=maxSymbolValue; s++) { + if ((norm[s] == NOT_YET_ASSIGNED) && (count[s] <= lowOne)) { + norm[s] = 1; + distributed++; + total -= count[s]; + continue; + } } + ToDistribute = (1 << tableLog) - distributed; + } + + if (distributed == maxSymbolValue+1) { + /* all values are pretty poor; + probably incompressible data (should have already been detected); + find max, then give all remaining points to max */ + U32 maxV = 0, maxC = 0; + for (s=0; s<=maxSymbolValue; s++) + if (count[s] > maxC) { maxV=s; maxC=count[s]; } + norm[maxV] += (short)ToDistribute; + return 0; + } + + if (total == 0) { + /* all of the symbols were low enough for the lowOne or lowThreshold */ + for (s=0; ToDistribute > 0; s = (s+1)%(maxSymbolValue+1)) + if (norm[s] > 0) { ToDistribute--; norm[s]++; } + return 0; + } + + { U64 const vStepLog = 62 - tableLog; + U64 const mid = (1ULL << (vStepLog-1)) - 1; + U64 const rStep = ZSTD_div64((((U64)1<> vStepLog); + U32 const sEnd = (U32)(end >> vStepLog); + U32 const weight = sEnd - sStart; + if (weight < 1) + return ERROR(GENERIC); + norm[s] = (short)weight; + tmpTotal = end; + } } } + + return 0; +} + +size_t FSE_normalizeCount (short* normalizedCounter, unsigned tableLog, + const unsigned* count, size_t total, + unsigned maxSymbolValue, unsigned useLowProbCount) +{ + /* Sanity checks */ + if (tableLog==0) tableLog = FSE_DEFAULT_TABLELOG; + if (tableLog < FSE_MIN_TABLELOG) return ERROR(GENERIC); /* Unsupported size */ + if (tableLog > FSE_MAX_TABLELOG) return ERROR(tableLog_tooLarge); /* Unsupported size */ + if (tableLog < FSE_minTableLog(total, maxSymbolValue)) return ERROR(GENERIC); /* Too small tableLog, compression potentially impossible */ + + { static U32 const rtbTable[] = { 0, 473195, 504333, 520860, 550000, 700000, 750000, 830000 }; + short const lowProbCount = useLowProbCount ? -1 : 1; + U64 const scale = 62 - tableLog; + U64 const step = ZSTD_div64((U64)1<<62, (U32)total); /* <== here, one division ! */ + U64 const vStep = 1ULL<<(scale-20); + int stillToDistribute = 1<> tableLog); + + for (s=0; s<=maxSymbolValue; s++) { + if (count[s] == total) return 0; /* rle special case */ + if (count[s] == 0) { normalizedCounter[s]=0; continue; } + if (count[s] <= lowThreshold) { + normalizedCounter[s] = lowProbCount; + stillToDistribute--; + } else { + short proba = (short)((count[s]*step) >> scale); + if (proba<8) { + U64 restToBeat = vStep * rtbTable[proba]; + proba += (count[s]*step) - ((U64)proba< restToBeat; + } + if (proba > largestP) { largestP=proba; largest=s; } + normalizedCounter[s] = proba; + stillToDistribute -= proba; + } } + if (-stillToDistribute >= (normalizedCounter[largest] >> 1)) { + /* corner case, need another normalization method */ + size_t const errorCode = FSE_normalizeM2(normalizedCounter, tableLog, count, total, maxSymbolValue, lowProbCount); + if (FSE_isError(errorCode)) return errorCode; + } + else normalizedCounter[largest] += (short)stillToDistribute; + } + +#if 0 + { /* Print Table (debug) */ + U32 s; + U32 nTotal = 0; + for (s=0; s<=maxSymbolValue; s++) + RAWLOG(2, "%3i: %4i \n", s, normalizedCounter[s]); + for (s=0; s<=maxSymbolValue; s++) + nTotal += abs(normalizedCounter[s]); + if (nTotal != (1U<>1); /* assumption : tableLog >= 1 */ + FSE_symbolCompressionTransform* const symbolTT = (FSE_symbolCompressionTransform*) (FSCT); + unsigned s; + + /* Sanity checks */ + if (nbBits < 1) return ERROR(GENERIC); /* min size */ + + /* header */ + tableU16[-2] = (U16) nbBits; + tableU16[-1] = (U16) maxSymbolValue; + + /* Build table */ + for (s=0; s FSE_MAX_TABLELOG*4+7 ) && (srcSize & 2)) { /* test bit 2 */ + FSE_encodeSymbol(&bitC, &CState2, *--ip); + FSE_encodeSymbol(&bitC, &CState1, *--ip); + FSE_FLUSHBITS(&bitC); + } + + /* 2 or 4 encoding per loop */ + while ( ip>istart ) { + + FSE_encodeSymbol(&bitC, &CState2, *--ip); + + if (sizeof(bitC.bitContainer)*8 < FSE_MAX_TABLELOG*2+7 ) /* this test must be static */ + FSE_FLUSHBITS(&bitC); + + FSE_encodeSymbol(&bitC, &CState1, *--ip); + + if (sizeof(bitC.bitContainer)*8 > FSE_MAX_TABLELOG*4+7 ) { /* this test must be static */ + FSE_encodeSymbol(&bitC, &CState2, *--ip); + FSE_encodeSymbol(&bitC, &CState1, *--ip); + } + + FSE_FLUSHBITS(&bitC); + } + + FSE_flushCState(&bitC, &CState2); + FSE_flushCState(&bitC, &CState1); + return BIT_closeCStream(&bitC); +} + +size_t FSE_compress_usingCTable (void* dst, size_t dstSize, + const void* src, size_t srcSize, + const FSE_CTable* ct) +{ + unsigned const fast = (dstSize >= FSE_BLOCKBOUND(srcSize)); + + if (fast) + return FSE_compress_usingCTable_generic(dst, dstSize, src, srcSize, ct, 1); + else + return FSE_compress_usingCTable_generic(dst, dstSize, src, srcSize, ct, 0); +} + + +size_t FSE_compressBound(size_t size) { return FSE_COMPRESSBOUND(size); } + +#ifndef ZSTD_NO_UNUSED_FUNCTIONS +/* FSE_compress_wksp() : + * Same as FSE_compress2(), but using an externally allocated scratch buffer (`workSpace`). + * `wkspSize` size must be `(1< not compressible */ + if (maxCount < (srcSize >> 7)) return 0; /* Heuristic : not compressible enough */ + } + + tableLog = FSE_optimalTableLog(tableLog, srcSize, maxSymbolValue); + CHECK_F( FSE_normalizeCount(norm, tableLog, count, srcSize, maxSymbolValue, /* useLowProbCount */ srcSize >= 2048) ); + + /* Write table description header */ + { CHECK_V_F(nc_err, FSE_writeNCount(op, oend-op, norm, maxSymbolValue, tableLog) ); + op += nc_err; + } + + /* Compress */ + CHECK_F( FSE_buildCTable_wksp(CTable, norm, maxSymbolValue, tableLog, scratchBuffer, scratchBufferSize) ); + { CHECK_V_F(cSize, FSE_compress_usingCTable(op, oend - op, src, srcSize, CTable) ); + if (cSize == 0) return 0; /* not enough space for compressed data */ + op += cSize; + } + + /* check compressibility */ + if ( (size_t)(op-ostart) >= srcSize-1 ) return 0; + + return op-ostart; +} + +typedef struct { + FSE_CTable CTable_max[FSE_CTABLE_SIZE_U32(FSE_MAX_TABLELOG, FSE_MAX_SYMBOL_VALUE)]; + union { + U32 hist_wksp[HIST_WKSP_SIZE_U32]; + BYTE scratchBuffer[1 << FSE_MAX_TABLELOG]; + } workspace; +} fseWkspMax_t; + +size_t FSE_compress2 (void* dst, size_t dstCapacity, const void* src, size_t srcSize, unsigned maxSymbolValue, unsigned tableLog) +{ + fseWkspMax_t scratchBuffer; + DEBUG_STATIC_ASSERT(sizeof(scratchBuffer) >= FSE_COMPRESS_WKSP_SIZE_U32(FSE_MAX_TABLELOG, FSE_MAX_SYMBOL_VALUE)); /* compilation failures here means scratchBuffer is not large enough */ + if (tableLog > FSE_MAX_TABLELOG) return ERROR(tableLog_tooLarge); + return FSE_compress_wksp(dst, dstCapacity, src, srcSize, maxSymbolValue, tableLog, &scratchBuffer, sizeof(scratchBuffer)); +} + +size_t FSE_compress (void* dst, size_t dstCapacity, const void* src, size_t srcSize) +{ + return FSE_compress2(dst, dstCapacity, src, srcSize, FSE_MAX_SYMBOL_VALUE, FSE_DEFAULT_TABLELOG); +} +#endif + +#endif /* FSE_COMMONDEFS_ONLY */ diff --git a/external/zstd/lib/compress/hist.c b/external/zstd/lib/compress/hist.c new file mode 100644 index 00000000..073c57e7 --- /dev/null +++ b/external/zstd/lib/compress/hist.c @@ -0,0 +1,181 @@ +/* ****************************************************************** + * hist : Histogram functions + * part of Finite State Entropy project + * Copyright (c) Yann Collet, Facebook, Inc. + * + * You can contact the author at : + * - FSE source repository : https://github.com/Cyan4973/FiniteStateEntropy + * - Public forum : https://groups.google.com/forum/#!forum/lz4c + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. +****************************************************************** */ + +/* --- dependencies --- */ +#include "../common/mem.h" /* U32, BYTE, etc. */ +#include "../common/debug.h" /* assert, DEBUGLOG */ +#include "../common/error_private.h" /* ERROR */ +#include "hist.h" + + +/* --- Error management --- */ +unsigned HIST_isError(size_t code) { return ERR_isError(code); } + +/*-************************************************************** + * Histogram functions + ****************************************************************/ +unsigned HIST_count_simple(unsigned* count, unsigned* maxSymbolValuePtr, + const void* src, size_t srcSize) +{ + const BYTE* ip = (const BYTE*)src; + const BYTE* const end = ip + srcSize; + unsigned maxSymbolValue = *maxSymbolValuePtr; + unsigned largestCount=0; + + ZSTD_memset(count, 0, (maxSymbolValue+1) * sizeof(*count)); + if (srcSize==0) { *maxSymbolValuePtr = 0; return 0; } + + while (ip largestCount) largestCount = count[s]; + } + + return largestCount; +} + +typedef enum { trustInput, checkMaxSymbolValue } HIST_checkInput_e; + +/* HIST_count_parallel_wksp() : + * store histogram into 4 intermediate tables, recombined at the end. + * this design makes better use of OoO cpus, + * and is noticeably faster when some values are heavily repeated. + * But it needs some additional workspace for intermediate tables. + * `workSpace` must be a U32 table of size >= HIST_WKSP_SIZE_U32. + * @return : largest histogram frequency, + * or an error code (notably when histogram's alphabet is larger than *maxSymbolValuePtr) */ +static size_t HIST_count_parallel_wksp( + unsigned* count, unsigned* maxSymbolValuePtr, + const void* source, size_t sourceSize, + HIST_checkInput_e check, + U32* const workSpace) +{ + const BYTE* ip = (const BYTE*)source; + const BYTE* const iend = ip+sourceSize; + size_t const countSize = (*maxSymbolValuePtr + 1) * sizeof(*count); + unsigned max=0; + U32* const Counting1 = workSpace; + U32* const Counting2 = Counting1 + 256; + U32* const Counting3 = Counting2 + 256; + U32* const Counting4 = Counting3 + 256; + + /* safety checks */ + assert(*maxSymbolValuePtr <= 255); + if (!sourceSize) { + ZSTD_memset(count, 0, countSize); + *maxSymbolValuePtr = 0; + return 0; + } + ZSTD_memset(workSpace, 0, 4*256*sizeof(unsigned)); + + /* by stripes of 16 bytes */ + { U32 cached = MEM_read32(ip); ip += 4; + while (ip < iend-15) { + U32 c = cached; cached = MEM_read32(ip); ip += 4; + Counting1[(BYTE) c ]++; + Counting2[(BYTE)(c>>8) ]++; + Counting3[(BYTE)(c>>16)]++; + Counting4[ c>>24 ]++; + c = cached; cached = MEM_read32(ip); ip += 4; + Counting1[(BYTE) c ]++; + Counting2[(BYTE)(c>>8) ]++; + Counting3[(BYTE)(c>>16)]++; + Counting4[ c>>24 ]++; + c = cached; cached = MEM_read32(ip); ip += 4; + Counting1[(BYTE) c ]++; + Counting2[(BYTE)(c>>8) ]++; + Counting3[(BYTE)(c>>16)]++; + Counting4[ c>>24 ]++; + c = cached; cached = MEM_read32(ip); ip += 4; + Counting1[(BYTE) c ]++; + Counting2[(BYTE)(c>>8) ]++; + Counting3[(BYTE)(c>>16)]++; + Counting4[ c>>24 ]++; + } + ip-=4; + } + + /* finish last symbols */ + while (ip max) max = Counting1[s]; + } } + + { unsigned maxSymbolValue = 255; + while (!Counting1[maxSymbolValue]) maxSymbolValue--; + if (check && maxSymbolValue > *maxSymbolValuePtr) return ERROR(maxSymbolValue_tooSmall); + *maxSymbolValuePtr = maxSymbolValue; + ZSTD_memmove(count, Counting1, countSize); /* in case count & Counting1 are overlapping */ + } + return (size_t)max; +} + +/* HIST_countFast_wksp() : + * Same as HIST_countFast(), but using an externally provided scratch buffer. + * `workSpace` is a writable buffer which must be 4-bytes aligned, + * `workSpaceSize` must be >= HIST_WKSP_SIZE + */ +size_t HIST_countFast_wksp(unsigned* count, unsigned* maxSymbolValuePtr, + const void* source, size_t sourceSize, + void* workSpace, size_t workSpaceSize) +{ + if (sourceSize < 1500) /* heuristic threshold */ + return HIST_count_simple(count, maxSymbolValuePtr, source, sourceSize); + if ((size_t)workSpace & 3) return ERROR(GENERIC); /* must be aligned on 4-bytes boundaries */ + if (workSpaceSize < HIST_WKSP_SIZE) return ERROR(workSpace_tooSmall); + return HIST_count_parallel_wksp(count, maxSymbolValuePtr, source, sourceSize, trustInput, (U32*)workSpace); +} + +/* HIST_count_wksp() : + * Same as HIST_count(), but using an externally provided scratch buffer. + * `workSpace` size must be table of >= HIST_WKSP_SIZE_U32 unsigned */ +size_t HIST_count_wksp(unsigned* count, unsigned* maxSymbolValuePtr, + const void* source, size_t sourceSize, + void* workSpace, size_t workSpaceSize) +{ + if ((size_t)workSpace & 3) return ERROR(GENERIC); /* must be aligned on 4-bytes boundaries */ + if (workSpaceSize < HIST_WKSP_SIZE) return ERROR(workSpace_tooSmall); + if (*maxSymbolValuePtr < 255) + return HIST_count_parallel_wksp(count, maxSymbolValuePtr, source, sourceSize, checkMaxSymbolValue, (U32*)workSpace); + *maxSymbolValuePtr = 255; + return HIST_countFast_wksp(count, maxSymbolValuePtr, source, sourceSize, workSpace, workSpaceSize); +} + +#ifndef ZSTD_NO_UNUSED_FUNCTIONS +/* fast variant (unsafe : won't check if src contains values beyond count[] limit) */ +size_t HIST_countFast(unsigned* count, unsigned* maxSymbolValuePtr, + const void* source, size_t sourceSize) +{ + unsigned tmpCounters[HIST_WKSP_SIZE_U32]; + return HIST_countFast_wksp(count, maxSymbolValuePtr, source, sourceSize, tmpCounters, sizeof(tmpCounters)); +} + +size_t HIST_count(unsigned* count, unsigned* maxSymbolValuePtr, + const void* src, size_t srcSize) +{ + unsigned tmpCounters[HIST_WKSP_SIZE_U32]; + return HIST_count_wksp(count, maxSymbolValuePtr, src, srcSize, tmpCounters, sizeof(tmpCounters)); +} +#endif diff --git a/external/zstd/lib/compress/hist.h b/external/zstd/lib/compress/hist.h new file mode 100644 index 00000000..228ed48a --- /dev/null +++ b/external/zstd/lib/compress/hist.h @@ -0,0 +1,75 @@ +/* ****************************************************************** + * hist : Histogram functions + * part of Finite State Entropy project + * Copyright (c) Yann Collet, Facebook, Inc. + * + * You can contact the author at : + * - FSE source repository : https://github.com/Cyan4973/FiniteStateEntropy + * - Public forum : https://groups.google.com/forum/#!forum/lz4c + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. +****************************************************************** */ + +/* --- dependencies --- */ +#include "../common/zstd_deps.h" /* size_t */ + + +/* --- simple histogram functions --- */ + +/*! HIST_count(): + * Provides the precise count of each byte within a table 'count'. + * 'count' is a table of unsigned int, of minimum size (*maxSymbolValuePtr+1). + * Updates *maxSymbolValuePtr with actual largest symbol value detected. + * @return : count of the most frequent symbol (which isn't identified). + * or an error code, which can be tested using HIST_isError(). + * note : if return == srcSize, there is only one symbol. + */ +size_t HIST_count(unsigned* count, unsigned* maxSymbolValuePtr, + const void* src, size_t srcSize); + +unsigned HIST_isError(size_t code); /**< tells if a return value is an error code */ + + +/* --- advanced histogram functions --- */ + +#define HIST_WKSP_SIZE_U32 1024 +#define HIST_WKSP_SIZE (HIST_WKSP_SIZE_U32 * sizeof(unsigned)) +/** HIST_count_wksp() : + * Same as HIST_count(), but using an externally provided scratch buffer. + * Benefit is this function will use very little stack space. + * `workSpace` is a writable buffer which must be 4-bytes aligned, + * `workSpaceSize` must be >= HIST_WKSP_SIZE + */ +size_t HIST_count_wksp(unsigned* count, unsigned* maxSymbolValuePtr, + const void* src, size_t srcSize, + void* workSpace, size_t workSpaceSize); + +/** HIST_countFast() : + * same as HIST_count(), but blindly trusts that all byte values within src are <= *maxSymbolValuePtr. + * This function is unsafe, and will segfault if any value within `src` is `> *maxSymbolValuePtr` + */ +size_t HIST_countFast(unsigned* count, unsigned* maxSymbolValuePtr, + const void* src, size_t srcSize); + +/** HIST_countFast_wksp() : + * Same as HIST_countFast(), but using an externally provided scratch buffer. + * `workSpace` is a writable buffer which must be 4-bytes aligned, + * `workSpaceSize` must be >= HIST_WKSP_SIZE + */ +size_t HIST_countFast_wksp(unsigned* count, unsigned* maxSymbolValuePtr, + const void* src, size_t srcSize, + void* workSpace, size_t workSpaceSize); + +/*! HIST_count_simple() : + * Same as HIST_countFast(), this function is unsafe, + * and will segfault if any value within `src` is `> *maxSymbolValuePtr`. + * It is also a bit slower for large inputs. + * However, it does not need any additional memory (not even on stack). + * @return : count of the most frequent symbol. + * Note this function doesn't produce any error (i.e. it must succeed). + */ +unsigned HIST_count_simple(unsigned* count, unsigned* maxSymbolValuePtr, + const void* src, size_t srcSize); diff --git a/external/zstd/lib/compress/huf_compress.c b/external/zstd/lib/compress/huf_compress.c new file mode 100644 index 00000000..485906e6 --- /dev/null +++ b/external/zstd/lib/compress/huf_compress.c @@ -0,0 +1,937 @@ +/* ****************************************************************** + * Huffman encoder, part of New Generation Entropy library + * Copyright (c) Yann Collet, Facebook, Inc. + * + * You can contact the author at : + * - FSE+HUF source repository : https://github.com/Cyan4973/FiniteStateEntropy + * - Public forum : https://groups.google.com/forum/#!forum/lz4c + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. +****************************************************************** */ + +/* ************************************************************** +* Compiler specifics +****************************************************************/ +#ifdef _MSC_VER /* Visual Studio */ +# pragma warning(disable : 4127) /* disable: C4127: conditional expression is constant */ +#endif + + +/* ************************************************************** +* Includes +****************************************************************/ +#include "../common/zstd_deps.h" /* ZSTD_memcpy, ZSTD_memset */ +#include "../common/compiler.h" +#include "../common/bitstream.h" +#include "hist.h" +#define FSE_STATIC_LINKING_ONLY /* FSE_optimalTableLog_internal */ +#include "../common/fse.h" /* header compression */ +#define HUF_STATIC_LINKING_ONLY +#include "../common/huf.h" +#include "../common/error_private.h" + + +/* ************************************************************** +* Error Management +****************************************************************/ +#define HUF_isError ERR_isError +#define HUF_STATIC_ASSERT(c) DEBUG_STATIC_ASSERT(c) /* use only *after* variable declarations */ + + +/* ************************************************************** +* Utils +****************************************************************/ +unsigned HUF_optimalTableLog(unsigned maxTableLog, size_t srcSize, unsigned maxSymbolValue) +{ + return FSE_optimalTableLog_internal(maxTableLog, srcSize, maxSymbolValue, 1); +} + + +/* ******************************************************* +* HUF : Huffman block compression +*********************************************************/ +/* HUF_compressWeights() : + * Same as FSE_compress(), but dedicated to huff0's weights compression. + * The use case needs much less stack memory. + * Note : all elements within weightTable are supposed to be <= HUF_TABLELOG_MAX. + */ +#define MAX_FSE_TABLELOG_FOR_HUFF_HEADER 6 + +typedef struct { + FSE_CTable CTable[FSE_CTABLE_SIZE_U32(MAX_FSE_TABLELOG_FOR_HUFF_HEADER, HUF_TABLELOG_MAX)]; + U32 scratchBuffer[FSE_BUILD_CTABLE_WORKSPACE_SIZE_U32(HUF_TABLELOG_MAX, MAX_FSE_TABLELOG_FOR_HUFF_HEADER)]; + unsigned count[HUF_TABLELOG_MAX+1]; + S16 norm[HUF_TABLELOG_MAX+1]; +} HUF_CompressWeightsWksp; + +static size_t HUF_compressWeights(void* dst, size_t dstSize, const void* weightTable, size_t wtSize, void* workspace, size_t workspaceSize) +{ + BYTE* const ostart = (BYTE*) dst; + BYTE* op = ostart; + BYTE* const oend = ostart + dstSize; + + unsigned maxSymbolValue = HUF_TABLELOG_MAX; + U32 tableLog = MAX_FSE_TABLELOG_FOR_HUFF_HEADER; + HUF_CompressWeightsWksp* wksp = (HUF_CompressWeightsWksp*)workspace; + + if (workspaceSize < sizeof(HUF_CompressWeightsWksp)) return ERROR(GENERIC); + + /* init conditions */ + if (wtSize <= 1) return 0; /* Not compressible */ + + /* Scan input and build symbol stats */ + { unsigned const maxCount = HIST_count_simple(wksp->count, &maxSymbolValue, weightTable, wtSize); /* never fails */ + if (maxCount == wtSize) return 1; /* only a single symbol in src : rle */ + if (maxCount == 1) return 0; /* each symbol present maximum once => not compressible */ + } + + tableLog = FSE_optimalTableLog(tableLog, wtSize, maxSymbolValue); + CHECK_F( FSE_normalizeCount(wksp->norm, tableLog, wksp->count, wtSize, maxSymbolValue, /* useLowProbCount */ 0) ); + + /* Write table description header */ + { CHECK_V_F(hSize, FSE_writeNCount(op, (size_t)(oend-op), wksp->norm, maxSymbolValue, tableLog) ); + op += hSize; + } + + /* Compress */ + CHECK_F( FSE_buildCTable_wksp(wksp->CTable, wksp->norm, maxSymbolValue, tableLog, wksp->scratchBuffer, sizeof(wksp->scratchBuffer)) ); + { CHECK_V_F(cSize, FSE_compress_usingCTable(op, (size_t)(oend - op), weightTable, wtSize, wksp->CTable) ); + if (cSize == 0) return 0; /* not enough space for compressed data */ + op += cSize; + } + + return (size_t)(op-ostart); +} + + +typedef struct { + HUF_CompressWeightsWksp wksp; + BYTE bitsToWeight[HUF_TABLELOG_MAX + 1]; /* precomputed conversion table */ + BYTE huffWeight[HUF_SYMBOLVALUE_MAX]; +} HUF_WriteCTableWksp; + +size_t HUF_writeCTable_wksp(void* dst, size_t maxDstSize, + const HUF_CElt* CTable, unsigned maxSymbolValue, unsigned huffLog, + void* workspace, size_t workspaceSize) +{ + BYTE* op = (BYTE*)dst; + U32 n; + HUF_WriteCTableWksp* wksp = (HUF_WriteCTableWksp*)workspace; + + /* check conditions */ + if (workspaceSize < sizeof(HUF_WriteCTableWksp)) return ERROR(GENERIC); + if (maxSymbolValue > HUF_SYMBOLVALUE_MAX) return ERROR(maxSymbolValue_tooLarge); + + /* convert to weight */ + wksp->bitsToWeight[0] = 0; + for (n=1; nbitsToWeight[n] = (BYTE)(huffLog + 1 - n); + for (n=0; nhuffWeight[n] = wksp->bitsToWeight[CTable[n].nbBits]; + + /* attempt weights compression by FSE */ + { CHECK_V_F(hSize, HUF_compressWeights(op+1, maxDstSize-1, wksp->huffWeight, maxSymbolValue, &wksp->wksp, sizeof(wksp->wksp)) ); + if ((hSize>1) & (hSize < maxSymbolValue/2)) { /* FSE compressed */ + op[0] = (BYTE)hSize; + return hSize+1; + } } + + /* write raw values as 4-bits (max : 15) */ + if (maxSymbolValue > (256-128)) return ERROR(GENERIC); /* should not happen : likely means source cannot be compressed */ + if (((maxSymbolValue+1)/2) + 1 > maxDstSize) return ERROR(dstSize_tooSmall); /* not enough space within dst buffer */ + op[0] = (BYTE)(128 /*special case*/ + (maxSymbolValue-1)); + wksp->huffWeight[maxSymbolValue] = 0; /* to be sure it doesn't cause msan issue in final combination */ + for (n=0; nhuffWeight[n] << 4) + wksp->huffWeight[n+1]); + return ((maxSymbolValue+1)/2) + 1; +} + +/*! HUF_writeCTable() : + `CTable` : Huffman tree to save, using huf representation. + @return : size of saved CTable */ +size_t HUF_writeCTable (void* dst, size_t maxDstSize, + const HUF_CElt* CTable, unsigned maxSymbolValue, unsigned huffLog) +{ + HUF_WriteCTableWksp wksp; + return HUF_writeCTable_wksp(dst, maxDstSize, CTable, maxSymbolValue, huffLog, &wksp, sizeof(wksp)); +} + + +size_t HUF_readCTable (HUF_CElt* CTable, unsigned* maxSymbolValuePtr, const void* src, size_t srcSize, unsigned* hasZeroWeights) +{ + BYTE huffWeight[HUF_SYMBOLVALUE_MAX + 1]; /* init not required, even though some static analyzer may complain */ + U32 rankVal[HUF_TABLELOG_ABSOLUTEMAX + 1]; /* large enough for values from 0 to 16 */ + U32 tableLog = 0; + U32 nbSymbols = 0; + + /* get symbol weights */ + CHECK_V_F(readSize, HUF_readStats(huffWeight, HUF_SYMBOLVALUE_MAX+1, rankVal, &nbSymbols, &tableLog, src, srcSize)); + *hasZeroWeights = (rankVal[0] > 0); + + /* check result */ + if (tableLog > HUF_TABLELOG_MAX) return ERROR(tableLog_tooLarge); + if (nbSymbols > *maxSymbolValuePtr+1) return ERROR(maxSymbolValue_tooSmall); + + /* Prepare base value per rank */ + { U32 n, nextRankStart = 0; + for (n=1; n<=tableLog; n++) { + U32 curr = nextRankStart; + nextRankStart += (rankVal[n] << (n-1)); + rankVal[n] = curr; + } } + + /* fill nbBits */ + { U32 n; for (n=0; nn=tableLog+1 */ + U16 valPerRank[HUF_TABLELOG_MAX+2] = {0}; + { U32 n; for (n=0; n0; n--) { /* start at n=tablelog <-> w=1 */ + valPerRank[n] = min; /* get starting value within each rank */ + min += nbPerRank[n]; + min >>= 1; + } } + /* assign value within rank, symbol order */ + { U32 n; for (n=0; n maxNbBits to be maxNbBits. Then it adjusts + * the tree to so that it is a valid canonical Huffman tree. + * + * @pre The sum of the ranks of each symbol == 2^largestBits, + * where largestBits == huffNode[lastNonNull].nbBits. + * @post The sum of the ranks of each symbol == 2^largestBits, + * where largestBits is the return value <= maxNbBits. + * + * @param huffNode The Huffman tree modified in place to enforce maxNbBits. + * @param lastNonNull The symbol with the lowest count in the Huffman tree. + * @param maxNbBits The maximum allowed number of bits, which the Huffman tree + * may not respect. After this function the Huffman tree will + * respect maxNbBits. + * @return The maximum number of bits of the Huffman tree after adjustment, + * necessarily no more than maxNbBits. + */ +static U32 HUF_setMaxHeight(nodeElt* huffNode, U32 lastNonNull, U32 maxNbBits) +{ + const U32 largestBits = huffNode[lastNonNull].nbBits; + /* early exit : no elt > maxNbBits, so the tree is already valid. */ + if (largestBits <= maxNbBits) return largestBits; + + /* there are several too large elements (at least >= 2) */ + { int totalCost = 0; + const U32 baseCost = 1 << (largestBits - maxNbBits); + int n = (int)lastNonNull; + + /* Adjust any ranks > maxNbBits to maxNbBits. + * Compute totalCost, which is how far the sum of the ranks is + * we are over 2^largestBits after adjust the offending ranks. + */ + while (huffNode[n].nbBits > maxNbBits) { + totalCost += baseCost - (1 << (largestBits - huffNode[n].nbBits)); + huffNode[n].nbBits = (BYTE)maxNbBits; + n--; + } + /* n stops at huffNode[n].nbBits <= maxNbBits */ + assert(huffNode[n].nbBits <= maxNbBits); + /* n end at index of smallest symbol using < maxNbBits */ + while (huffNode[n].nbBits == maxNbBits) --n; + + /* renorm totalCost from 2^largestBits to 2^maxNbBits + * note : totalCost is necessarily a multiple of baseCost */ + assert((totalCost & (baseCost - 1)) == 0); + totalCost >>= (largestBits - maxNbBits); + assert(totalCost > 0); + + /* repay normalized cost */ + { U32 const noSymbol = 0xF0F0F0F0; + U32 rankLast[HUF_TABLELOG_MAX+2]; + + /* Get pos of last (smallest = lowest cum. count) symbol per rank */ + ZSTD_memset(rankLast, 0xF0, sizeof(rankLast)); + { U32 currentNbBits = maxNbBits; + int pos; + for (pos=n ; pos >= 0; pos--) { + if (huffNode[pos].nbBits >= currentNbBits) continue; + currentNbBits = huffNode[pos].nbBits; /* < maxNbBits */ + rankLast[maxNbBits-currentNbBits] = (U32)pos; + } } + + while (totalCost > 0) { + /* Try to reduce the next power of 2 above totalCost because we + * gain back half the rank. + */ + U32 nBitsToDecrease = BIT_highbit32((U32)totalCost) + 1; + for ( ; nBitsToDecrease > 1; nBitsToDecrease--) { + U32 const highPos = rankLast[nBitsToDecrease]; + U32 const lowPos = rankLast[nBitsToDecrease-1]; + if (highPos == noSymbol) continue; + /* Decrease highPos if no symbols of lowPos or if it is + * not cheaper to remove 2 lowPos than highPos. + */ + if (lowPos == noSymbol) break; + { U32 const highTotal = huffNode[highPos].count; + U32 const lowTotal = 2 * huffNode[lowPos].count; + if (highTotal <= lowTotal) break; + } } + /* only triggered when no more rank 1 symbol left => find closest one (note : there is necessarily at least one !) */ + assert(rankLast[nBitsToDecrease] != noSymbol || nBitsToDecrease == 1); + /* HUF_MAX_TABLELOG test just to please gcc 5+; but it should not be necessary */ + while ((nBitsToDecrease<=HUF_TABLELOG_MAX) && (rankLast[nBitsToDecrease] == noSymbol)) + nBitsToDecrease++; + assert(rankLast[nBitsToDecrease] != noSymbol); + /* Increase the number of bits to gain back half the rank cost. */ + totalCost -= 1 << (nBitsToDecrease-1); + huffNode[rankLast[nBitsToDecrease]].nbBits++; + + /* Fix up the new rank. + * If the new rank was empty, this symbol is now its smallest. + * Otherwise, this symbol will be the largest in the new rank so no adjustment. + */ + if (rankLast[nBitsToDecrease-1] == noSymbol) + rankLast[nBitsToDecrease-1] = rankLast[nBitsToDecrease]; + /* Fix up the old rank. + * If the symbol was at position 0, meaning it was the highest weight symbol in the tree, + * it must be the only symbol in its rank, so the old rank now has no symbols. + * Otherwise, since the Huffman nodes are sorted by count, the previous position is now + * the smallest node in the rank. If the previous position belongs to a different rank, + * then the rank is now empty. + */ + if (rankLast[nBitsToDecrease] == 0) /* special case, reached largest symbol */ + rankLast[nBitsToDecrease] = noSymbol; + else { + rankLast[nBitsToDecrease]--; + if (huffNode[rankLast[nBitsToDecrease]].nbBits != maxNbBits-nBitsToDecrease) + rankLast[nBitsToDecrease] = noSymbol; /* this rank is now empty */ + } + } /* while (totalCost > 0) */ + + /* If we've removed too much weight, then we have to add it back. + * To avoid overshooting again, we only adjust the smallest rank. + * We take the largest nodes from the lowest rank 0 and move them + * to rank 1. There's guaranteed to be enough rank 0 symbols because + * TODO. + */ + while (totalCost < 0) { /* Sometimes, cost correction overshoot */ + /* special case : no rank 1 symbol (using maxNbBits-1); + * let's create one from largest rank 0 (using maxNbBits). + */ + if (rankLast[1] == noSymbol) { + while (huffNode[n].nbBits == maxNbBits) n--; + huffNode[n+1].nbBits--; + assert(n >= 0); + rankLast[1] = (U32)(n+1); + totalCost++; + continue; + } + huffNode[ rankLast[1] + 1 ].nbBits--; + rankLast[1]++; + totalCost ++; + } + } /* repay normalized cost */ + } /* there are several too large elements (at least >= 2) */ + + return maxNbBits; +} + +typedef struct { + U32 base; + U32 curr; +} rankPos; + +typedef nodeElt huffNodeTable[HUF_CTABLE_WORKSPACE_SIZE_U32]; + +#define RANK_POSITION_TABLE_SIZE 32 + +typedef struct { + huffNodeTable huffNodeTbl; + rankPos rankPosition[RANK_POSITION_TABLE_SIZE]; +} HUF_buildCTable_wksp_tables; + +/** + * HUF_sort(): + * Sorts the symbols [0, maxSymbolValue] by count[symbol] in decreasing order. + * + * @param[out] huffNode Sorted symbols by decreasing count. Only members `.count` and `.byte` are filled. + * Must have (maxSymbolValue + 1) entries. + * @param[in] count Histogram of the symbols. + * @param[in] maxSymbolValue Maximum symbol value. + * @param rankPosition This is a scratch workspace. Must have RANK_POSITION_TABLE_SIZE entries. + */ +static void HUF_sort(nodeElt* huffNode, const unsigned* count, U32 maxSymbolValue, rankPos* rankPosition) +{ + int n; + int const maxSymbolValue1 = (int)maxSymbolValue + 1; + + /* Compute base and set curr to base. + * For symbol s let lowerRank = BIT_highbit32(count[n]+1) and rank = lowerRank + 1. + * Then 2^lowerRank <= count[n]+1 <= 2^rank. + * We attribute each symbol to lowerRank's base value, because we want to know where + * each rank begins in the output, so for rank R we want to count ranks R+1 and above. + */ + ZSTD_memset(rankPosition, 0, sizeof(*rankPosition) * RANK_POSITION_TABLE_SIZE); + for (n = 0; n < maxSymbolValue1; ++n) { + U32 lowerRank = BIT_highbit32(count[n] + 1); + rankPosition[lowerRank].base++; + } + assert(rankPosition[RANK_POSITION_TABLE_SIZE - 1].base == 0); + for (n = RANK_POSITION_TABLE_SIZE - 1; n > 0; --n) { + rankPosition[n-1].base += rankPosition[n].base; + rankPosition[n-1].curr = rankPosition[n-1].base; + } + /* Sort */ + for (n = 0; n < maxSymbolValue1; ++n) { + U32 const c = count[n]; + U32 const r = BIT_highbit32(c+1) + 1; + U32 pos = rankPosition[r].curr++; + /* Insert into the correct position in the rank. + * We have at most 256 symbols, so this insertion should be fine. + */ + while ((pos > rankPosition[r].base) && (c > huffNode[pos-1].count)) { + huffNode[pos] = huffNode[pos-1]; + pos--; + } + huffNode[pos].count = c; + huffNode[pos].byte = (BYTE)n; + } +} + + +/** HUF_buildCTable_wksp() : + * Same as HUF_buildCTable(), but using externally allocated scratch buffer. + * `workSpace` must be aligned on 4-bytes boundaries, and be at least as large as sizeof(HUF_buildCTable_wksp_tables). + */ +#define STARTNODE (HUF_SYMBOLVALUE_MAX+1) + +/* HUF_buildTree(): + * Takes the huffNode array sorted by HUF_sort() and builds an unlimited-depth Huffman tree. + * + * @param huffNode The array sorted by HUF_sort(). Builds the Huffman tree in this array. + * @param maxSymbolValue The maximum symbol value. + * @return The smallest node in the Huffman tree (by count). + */ +static int HUF_buildTree(nodeElt* huffNode, U32 maxSymbolValue) +{ + nodeElt* const huffNode0 = huffNode - 1; + int nonNullRank; + int lowS, lowN; + int nodeNb = STARTNODE; + int n, nodeRoot; + /* init for parents */ + nonNullRank = (int)maxSymbolValue; + while(huffNode[nonNullRank].count == 0) nonNullRank--; + lowS = nonNullRank; nodeRoot = nodeNb + lowS - 1; lowN = nodeNb; + huffNode[nodeNb].count = huffNode[lowS].count + huffNode[lowS-1].count; + huffNode[lowS].parent = huffNode[lowS-1].parent = (U16)nodeNb; + nodeNb++; lowS-=2; + for (n=nodeNb; n<=nodeRoot; n++) huffNode[n].count = (U32)(1U<<30); + huffNode0[0].count = (U32)(1U<<31); /* fake entry, strong barrier */ + + /* create parents */ + while (nodeNb <= nodeRoot) { + int const n1 = (huffNode[lowS].count < huffNode[lowN].count) ? lowS-- : lowN++; + int const n2 = (huffNode[lowS].count < huffNode[lowN].count) ? lowS-- : lowN++; + huffNode[nodeNb].count = huffNode[n1].count + huffNode[n2].count; + huffNode[n1].parent = huffNode[n2].parent = (U16)nodeNb; + nodeNb++; + } + + /* distribute weights (unlimited tree height) */ + huffNode[nodeRoot].nbBits = 0; + for (n=nodeRoot-1; n>=STARTNODE; n--) + huffNode[n].nbBits = huffNode[ huffNode[n].parent ].nbBits + 1; + for (n=0; n<=nonNullRank; n++) + huffNode[n].nbBits = huffNode[ huffNode[n].parent ].nbBits + 1; + + return nonNullRank; +} + +/** + * HUF_buildCTableFromTree(): + * Build the CTable given the Huffman tree in huffNode. + * + * @param[out] CTable The output Huffman CTable. + * @param huffNode The Huffman tree. + * @param nonNullRank The last and smallest node in the Huffman tree. + * @param maxSymbolValue The maximum symbol value. + * @param maxNbBits The exact maximum number of bits used in the Huffman tree. + */ +static void HUF_buildCTableFromTree(HUF_CElt* CTable, nodeElt const* huffNode, int nonNullRank, U32 maxSymbolValue, U32 maxNbBits) +{ + /* fill result into ctable (val, nbBits) */ + int n; + U16 nbPerRank[HUF_TABLELOG_MAX+1] = {0}; + U16 valPerRank[HUF_TABLELOG_MAX+1] = {0}; + int const alphabetSize = (int)(maxSymbolValue + 1); + for (n=0; n<=nonNullRank; n++) + nbPerRank[huffNode[n].nbBits]++; + /* determine starting value per rank */ + { U16 min = 0; + for (n=(int)maxNbBits; n>0; n--) { + valPerRank[n] = min; /* get starting value within each rank */ + min += nbPerRank[n]; + min >>= 1; + } } + for (n=0; nhuffNodeTbl; + nodeElt* const huffNode = huffNode0+1; + int nonNullRank; + + /* safety checks */ + if (((size_t)workSpace & 3) != 0) return ERROR(GENERIC); /* must be aligned on 4-bytes boundaries */ + if (wkspSize < sizeof(HUF_buildCTable_wksp_tables)) + return ERROR(workSpace_tooSmall); + if (maxNbBits == 0) maxNbBits = HUF_TABLELOG_DEFAULT; + if (maxSymbolValue > HUF_SYMBOLVALUE_MAX) + return ERROR(maxSymbolValue_tooLarge); + ZSTD_memset(huffNode0, 0, sizeof(huffNodeTable)); + + /* sort, decreasing order */ + HUF_sort(huffNode, count, maxSymbolValue, wksp_tables->rankPosition); + + /* build tree */ + nonNullRank = HUF_buildTree(huffNode, maxSymbolValue); + + /* enforce maxTableLog */ + maxNbBits = HUF_setMaxHeight(huffNode, (U32)nonNullRank, maxNbBits); + if (maxNbBits > HUF_TABLELOG_MAX) return ERROR(GENERIC); /* check fit into table */ + + HUF_buildCTableFromTree(tree, huffNode, nonNullRank, maxSymbolValue, maxNbBits); + + return maxNbBits; +} + +size_t HUF_estimateCompressedSize(const HUF_CElt* CTable, const unsigned* count, unsigned maxSymbolValue) +{ + size_t nbBits = 0; + int s; + for (s = 0; s <= (int)maxSymbolValue; ++s) { + nbBits += CTable[s].nbBits * count[s]; + } + return nbBits >> 3; +} + +int HUF_validateCTable(const HUF_CElt* CTable, const unsigned* count, unsigned maxSymbolValue) { + int bad = 0; + int s; + for (s = 0; s <= (int)maxSymbolValue; ++s) { + bad |= (count[s] != 0) & (CTable[s].nbBits == 0); + } + return !bad; +} + +size_t HUF_compressBound(size_t size) { return HUF_COMPRESSBOUND(size); } + +FORCE_INLINE_TEMPLATE void +HUF_encodeSymbol(BIT_CStream_t* bitCPtr, U32 symbol, const HUF_CElt* CTable) +{ + BIT_addBitsFast(bitCPtr, CTable[symbol].val, CTable[symbol].nbBits); +} + +#define HUF_FLUSHBITS(s) BIT_flushBits(s) + +#define HUF_FLUSHBITS_1(stream) \ + if (sizeof((stream)->bitContainer)*8 < HUF_TABLELOG_MAX*2+7) HUF_FLUSHBITS(stream) + +#define HUF_FLUSHBITS_2(stream) \ + if (sizeof((stream)->bitContainer)*8 < HUF_TABLELOG_MAX*4+7) HUF_FLUSHBITS(stream) + +FORCE_INLINE_TEMPLATE size_t +HUF_compress1X_usingCTable_internal_body(void* dst, size_t dstSize, + const void* src, size_t srcSize, + const HUF_CElt* CTable) +{ + const BYTE* ip = (const BYTE*) src; + BYTE* const ostart = (BYTE*)dst; + BYTE* const oend = ostart + dstSize; + BYTE* op = ostart; + size_t n; + BIT_CStream_t bitC; + + /* init */ + if (dstSize < 8) return 0; /* not enough space to compress */ + { size_t const initErr = BIT_initCStream(&bitC, op, (size_t)(oend-op)); + if (HUF_isError(initErr)) return 0; } + + n = srcSize & ~3; /* join to mod 4 */ + switch (srcSize & 3) + { + case 3 : HUF_encodeSymbol(&bitC, ip[n+ 2], CTable); + HUF_FLUSHBITS_2(&bitC); + /* fall-through */ + case 2 : HUF_encodeSymbol(&bitC, ip[n+ 1], CTable); + HUF_FLUSHBITS_1(&bitC); + /* fall-through */ + case 1 : HUF_encodeSymbol(&bitC, ip[n+ 0], CTable); + HUF_FLUSHBITS(&bitC); + /* fall-through */ + case 0 : /* fall-through */ + default: break; + } + + for (; n>0; n-=4) { /* note : n&3==0 at this stage */ + HUF_encodeSymbol(&bitC, ip[n- 1], CTable); + HUF_FLUSHBITS_1(&bitC); + HUF_encodeSymbol(&bitC, ip[n- 2], CTable); + HUF_FLUSHBITS_2(&bitC); + HUF_encodeSymbol(&bitC, ip[n- 3], CTable); + HUF_FLUSHBITS_1(&bitC); + HUF_encodeSymbol(&bitC, ip[n- 4], CTable); + HUF_FLUSHBITS(&bitC); + } + + return BIT_closeCStream(&bitC); +} + +#if DYNAMIC_BMI2 + +static TARGET_ATTRIBUTE("bmi2") size_t +HUF_compress1X_usingCTable_internal_bmi2(void* dst, size_t dstSize, + const void* src, size_t srcSize, + const HUF_CElt* CTable) +{ + return HUF_compress1X_usingCTable_internal_body(dst, dstSize, src, srcSize, CTable); +} + +static size_t +HUF_compress1X_usingCTable_internal_default(void* dst, size_t dstSize, + const void* src, size_t srcSize, + const HUF_CElt* CTable) +{ + return HUF_compress1X_usingCTable_internal_body(dst, dstSize, src, srcSize, CTable); +} + +static size_t +HUF_compress1X_usingCTable_internal(void* dst, size_t dstSize, + const void* src, size_t srcSize, + const HUF_CElt* CTable, const int bmi2) +{ + if (bmi2) { + return HUF_compress1X_usingCTable_internal_bmi2(dst, dstSize, src, srcSize, CTable); + } + return HUF_compress1X_usingCTable_internal_default(dst, dstSize, src, srcSize, CTable); +} + +#else + +static size_t +HUF_compress1X_usingCTable_internal(void* dst, size_t dstSize, + const void* src, size_t srcSize, + const HUF_CElt* CTable, const int bmi2) +{ + (void)bmi2; + return HUF_compress1X_usingCTable_internal_body(dst, dstSize, src, srcSize, CTable); +} + +#endif + +size_t HUF_compress1X_usingCTable(void* dst, size_t dstSize, const void* src, size_t srcSize, const HUF_CElt* CTable) +{ + return HUF_compress1X_usingCTable_internal(dst, dstSize, src, srcSize, CTable, /* bmi2 */ 0); +} + + +static size_t +HUF_compress4X_usingCTable_internal(void* dst, size_t dstSize, + const void* src, size_t srcSize, + const HUF_CElt* CTable, int bmi2) +{ + size_t const segmentSize = (srcSize+3)/4; /* first 3 segments */ + const BYTE* ip = (const BYTE*) src; + const BYTE* const iend = ip + srcSize; + BYTE* const ostart = (BYTE*) dst; + BYTE* const oend = ostart + dstSize; + BYTE* op = ostart; + + if (dstSize < 6 + 1 + 1 + 1 + 8) return 0; /* minimum space to compress successfully */ + if (srcSize < 12) return 0; /* no saving possible : too small input */ + op += 6; /* jumpTable */ + + assert(op <= oend); + { CHECK_V_F(cSize, HUF_compress1X_usingCTable_internal(op, (size_t)(oend-op), ip, segmentSize, CTable, bmi2) ); + if (cSize==0) return 0; + assert(cSize <= 65535); + MEM_writeLE16(ostart, (U16)cSize); + op += cSize; + } + + ip += segmentSize; + assert(op <= oend); + { CHECK_V_F(cSize, HUF_compress1X_usingCTable_internal(op, (size_t)(oend-op), ip, segmentSize, CTable, bmi2) ); + if (cSize==0) return 0; + assert(cSize <= 65535); + MEM_writeLE16(ostart+2, (U16)cSize); + op += cSize; + } + + ip += segmentSize; + assert(op <= oend); + { CHECK_V_F(cSize, HUF_compress1X_usingCTable_internal(op, (size_t)(oend-op), ip, segmentSize, CTable, bmi2) ); + if (cSize==0) return 0; + assert(cSize <= 65535); + MEM_writeLE16(ostart+4, (U16)cSize); + op += cSize; + } + + ip += segmentSize; + assert(op <= oend); + assert(ip <= iend); + { CHECK_V_F(cSize, HUF_compress1X_usingCTable_internal(op, (size_t)(oend-op), ip, (size_t)(iend-ip), CTable, bmi2) ); + if (cSize==0) return 0; + op += cSize; + } + + return (size_t)(op-ostart); +} + +size_t HUF_compress4X_usingCTable(void* dst, size_t dstSize, const void* src, size_t srcSize, const HUF_CElt* CTable) +{ + return HUF_compress4X_usingCTable_internal(dst, dstSize, src, srcSize, CTable, /* bmi2 */ 0); +} + +typedef enum { HUF_singleStream, HUF_fourStreams } HUF_nbStreams_e; + +static size_t HUF_compressCTable_internal( + BYTE* const ostart, BYTE* op, BYTE* const oend, + const void* src, size_t srcSize, + HUF_nbStreams_e nbStreams, const HUF_CElt* CTable, const int bmi2) +{ + size_t const cSize = (nbStreams==HUF_singleStream) ? + HUF_compress1X_usingCTable_internal(op, (size_t)(oend - op), src, srcSize, CTable, bmi2) : + HUF_compress4X_usingCTable_internal(op, (size_t)(oend - op), src, srcSize, CTable, bmi2); + if (HUF_isError(cSize)) { return cSize; } + if (cSize==0) { return 0; } /* uncompressible */ + op += cSize; + /* check compressibility */ + assert(op >= ostart); + if ((size_t)(op-ostart) >= srcSize-1) { return 0; } + return (size_t)(op-ostart); +} + +typedef struct { + unsigned count[HUF_SYMBOLVALUE_MAX + 1]; + HUF_CElt CTable[HUF_SYMBOLVALUE_MAX + 1]; + union { + HUF_buildCTable_wksp_tables buildCTable_wksp; + HUF_WriteCTableWksp writeCTable_wksp; + } wksps; +} HUF_compress_tables_t; + +/* HUF_compress_internal() : + * `workSpace_align4` must be aligned on 4-bytes boundaries, + * and occupies the same space as a table of HUF_WORKSPACE_SIZE_U32 unsigned */ +static size_t +HUF_compress_internal (void* dst, size_t dstSize, + const void* src, size_t srcSize, + unsigned maxSymbolValue, unsigned huffLog, + HUF_nbStreams_e nbStreams, + void* workSpace_align4, size_t wkspSize, + HUF_CElt* oldHufTable, HUF_repeat* repeat, int preferRepeat, + const int bmi2) +{ + HUF_compress_tables_t* const table = (HUF_compress_tables_t*)workSpace_align4; + BYTE* const ostart = (BYTE*)dst; + BYTE* const oend = ostart + dstSize; + BYTE* op = ostart; + + HUF_STATIC_ASSERT(sizeof(*table) <= HUF_WORKSPACE_SIZE); + assert(((size_t)workSpace_align4 & 3) == 0); /* must be aligned on 4-bytes boundaries */ + + /* checks & inits */ + if (wkspSize < HUF_WORKSPACE_SIZE) return ERROR(workSpace_tooSmall); + if (!srcSize) return 0; /* Uncompressed */ + if (!dstSize) return 0; /* cannot fit anything within dst budget */ + if (srcSize > HUF_BLOCKSIZE_MAX) return ERROR(srcSize_wrong); /* current block size limit */ + if (huffLog > HUF_TABLELOG_MAX) return ERROR(tableLog_tooLarge); + if (maxSymbolValue > HUF_SYMBOLVALUE_MAX) return ERROR(maxSymbolValue_tooLarge); + if (!maxSymbolValue) maxSymbolValue = HUF_SYMBOLVALUE_MAX; + if (!huffLog) huffLog = HUF_TABLELOG_DEFAULT; + + /* Heuristic : If old table is valid, use it for small inputs */ + if (preferRepeat && repeat && *repeat == HUF_repeat_valid) { + return HUF_compressCTable_internal(ostart, op, oend, + src, srcSize, + nbStreams, oldHufTable, bmi2); + } + + /* Scan input and build symbol stats */ + { CHECK_V_F(largest, HIST_count_wksp (table->count, &maxSymbolValue, (const BYTE*)src, srcSize, workSpace_align4, wkspSize) ); + if (largest == srcSize) { *ostart = ((const BYTE*)src)[0]; return 1; } /* single symbol, rle */ + if (largest <= (srcSize >> 7)+4) return 0; /* heuristic : probably not compressible enough */ + } + + /* Check validity of previous table */ + if ( repeat + && *repeat == HUF_repeat_check + && !HUF_validateCTable(oldHufTable, table->count, maxSymbolValue)) { + *repeat = HUF_repeat_none; + } + /* Heuristic : use existing table for small inputs */ + if (preferRepeat && repeat && *repeat != HUF_repeat_none) { + return HUF_compressCTable_internal(ostart, op, oend, + src, srcSize, + nbStreams, oldHufTable, bmi2); + } + + /* Build Huffman Tree */ + huffLog = HUF_optimalTableLog(huffLog, srcSize, maxSymbolValue); + { size_t const maxBits = HUF_buildCTable_wksp(table->CTable, table->count, + maxSymbolValue, huffLog, + &table->wksps.buildCTable_wksp, sizeof(table->wksps.buildCTable_wksp)); + CHECK_F(maxBits); + huffLog = (U32)maxBits; + /* Zero unused symbols in CTable, so we can check it for validity */ + ZSTD_memset(table->CTable + (maxSymbolValue + 1), 0, + sizeof(table->CTable) - ((maxSymbolValue + 1) * sizeof(HUF_CElt))); + } + + /* Write table description header */ + { CHECK_V_F(hSize, HUF_writeCTable_wksp(op, dstSize, table->CTable, maxSymbolValue, huffLog, + &table->wksps.writeCTable_wksp, sizeof(table->wksps.writeCTable_wksp)) ); + /* Check if using previous huffman table is beneficial */ + if (repeat && *repeat != HUF_repeat_none) { + size_t const oldSize = HUF_estimateCompressedSize(oldHufTable, table->count, maxSymbolValue); + size_t const newSize = HUF_estimateCompressedSize(table->CTable, table->count, maxSymbolValue); + if (oldSize <= hSize + newSize || hSize + 12 >= srcSize) { + return HUF_compressCTable_internal(ostart, op, oend, + src, srcSize, + nbStreams, oldHufTable, bmi2); + } } + + /* Use the new huffman table */ + if (hSize + 12ul >= srcSize) { return 0; } + op += hSize; + if (repeat) { *repeat = HUF_repeat_none; } + if (oldHufTable) + ZSTD_memcpy(oldHufTable, table->CTable, sizeof(table->CTable)); /* Save new table */ + } + return HUF_compressCTable_internal(ostart, op, oend, + src, srcSize, + nbStreams, table->CTable, bmi2); +} + + +size_t HUF_compress1X_wksp (void* dst, size_t dstSize, + const void* src, size_t srcSize, + unsigned maxSymbolValue, unsigned huffLog, + void* workSpace, size_t wkspSize) +{ + return HUF_compress_internal(dst, dstSize, src, srcSize, + maxSymbolValue, huffLog, HUF_singleStream, + workSpace, wkspSize, + NULL, NULL, 0, 0 /*bmi2*/); +} + +size_t HUF_compress1X_repeat (void* dst, size_t dstSize, + const void* src, size_t srcSize, + unsigned maxSymbolValue, unsigned huffLog, + void* workSpace, size_t wkspSize, + HUF_CElt* hufTable, HUF_repeat* repeat, int preferRepeat, int bmi2) +{ + return HUF_compress_internal(dst, dstSize, src, srcSize, + maxSymbolValue, huffLog, HUF_singleStream, + workSpace, wkspSize, hufTable, + repeat, preferRepeat, bmi2); +} + +/* HUF_compress4X_repeat(): + * compress input using 4 streams. + * provide workspace to generate compression tables */ +size_t HUF_compress4X_wksp (void* dst, size_t dstSize, + const void* src, size_t srcSize, + unsigned maxSymbolValue, unsigned huffLog, + void* workSpace, size_t wkspSize) +{ + return HUF_compress_internal(dst, dstSize, src, srcSize, + maxSymbolValue, huffLog, HUF_fourStreams, + workSpace, wkspSize, + NULL, NULL, 0, 0 /*bmi2*/); +} + +/* HUF_compress4X_repeat(): + * compress input using 4 streams. + * re-use an existing huffman compression table */ +size_t HUF_compress4X_repeat (void* dst, size_t dstSize, + const void* src, size_t srcSize, + unsigned maxSymbolValue, unsigned huffLog, + void* workSpace, size_t wkspSize, + HUF_CElt* hufTable, HUF_repeat* repeat, int preferRepeat, int bmi2) +{ + return HUF_compress_internal(dst, dstSize, src, srcSize, + maxSymbolValue, huffLog, HUF_fourStreams, + workSpace, wkspSize, + hufTable, repeat, preferRepeat, bmi2); +} + +#ifndef ZSTD_NO_UNUSED_FUNCTIONS +/** HUF_buildCTable() : + * @return : maxNbBits + * Note : count is used before tree is written, so they can safely overlap + */ +size_t HUF_buildCTable (HUF_CElt* tree, const unsigned* count, unsigned maxSymbolValue, unsigned maxNbBits) +{ + HUF_buildCTable_wksp_tables workspace; + return HUF_buildCTable_wksp(tree, count, maxSymbolValue, maxNbBits, &workspace, sizeof(workspace)); +} + +size_t HUF_compress1X (void* dst, size_t dstSize, + const void* src, size_t srcSize, + unsigned maxSymbolValue, unsigned huffLog) +{ + unsigned workSpace[HUF_WORKSPACE_SIZE_U32]; + return HUF_compress1X_wksp(dst, dstSize, src, srcSize, maxSymbolValue, huffLog, workSpace, sizeof(workSpace)); +} + +size_t HUF_compress2 (void* dst, size_t dstSize, + const void* src, size_t srcSize, + unsigned maxSymbolValue, unsigned huffLog) +{ + unsigned workSpace[HUF_WORKSPACE_SIZE_U32]; + return HUF_compress4X_wksp(dst, dstSize, src, srcSize, maxSymbolValue, huffLog, workSpace, sizeof(workSpace)); +} + +size_t HUF_compress (void* dst, size_t maxDstSize, const void* src, size_t srcSize) +{ + return HUF_compress2(dst, maxDstSize, src, srcSize, 255, HUF_TABLELOG_DEFAULT); +} +#endif diff --git a/external/zstd/lib/compress/zstd_compress.c b/external/zstd/lib/compress/zstd_compress.c new file mode 100644 index 00000000..b7ee2980 --- /dev/null +++ b/external/zstd/lib/compress/zstd_compress.c @@ -0,0 +1,6393 @@ +/* + * Copyright (c) Yann Collet, Facebook, Inc. + * All rights reserved. + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. + */ + +/*-************************************* +* Dependencies +***************************************/ +#include "../common/zstd_deps.h" /* INT_MAX, ZSTD_memset, ZSTD_memcpy */ +#include "../common/cpu.h" +#include "../common/mem.h" +#include "hist.h" /* HIST_countFast_wksp */ +#define FSE_STATIC_LINKING_ONLY /* FSE_encodeSymbol */ +#include "../common/fse.h" +#define HUF_STATIC_LINKING_ONLY +#include "../common/huf.h" +#include "zstd_compress_internal.h" +#include "zstd_compress_sequences.h" +#include "zstd_compress_literals.h" +#include "zstd_fast.h" +#include "zstd_double_fast.h" +#include "zstd_lazy.h" +#include "zstd_opt.h" +#include "zstd_ldm.h" +#include "zstd_compress_superblock.h" + +/* *************************************************************** +* Tuning parameters +*****************************************************************/ +/*! + * COMPRESS_HEAPMODE : + * Select how default decompression function ZSTD_compress() allocates its context, + * on stack (0, default), or into heap (1). + * Note that functions with explicit context such as ZSTD_compressCCtx() are unaffected. + */ +#ifndef ZSTD_COMPRESS_HEAPMODE +# define ZSTD_COMPRESS_HEAPMODE 0 +#endif + + +/*-************************************* +* Helper functions +***************************************/ +/* ZSTD_compressBound() + * Note that the result from this function is only compatible with the "normal" + * full-block strategy. + * When there are a lot of small blocks due to frequent flush in streaming mode + * the overhead of headers can make the compressed data to be larger than the + * return value of ZSTD_compressBound(). + */ +size_t ZSTD_compressBound(size_t srcSize) { + return ZSTD_COMPRESSBOUND(srcSize); +} + + +/*-************************************* +* Context memory management +***************************************/ +struct ZSTD_CDict_s { + const void* dictContent; + size_t dictContentSize; + ZSTD_dictContentType_e dictContentType; /* The dictContentType the CDict was created with */ + U32* entropyWorkspace; /* entropy workspace of HUF_WORKSPACE_SIZE bytes */ + ZSTD_cwksp workspace; + ZSTD_matchState_t matchState; + ZSTD_compressedBlockState_t cBlockState; + ZSTD_customMem customMem; + U32 dictID; + int compressionLevel; /* 0 indicates that advanced API was used to select CDict params */ + ZSTD_useRowMatchFinderMode_e useRowMatchFinder; /* Indicates whether the CDict was created with params that would use + * row-based matchfinder. Unless the cdict is reloaded, we will use + * the same greedy/lazy matchfinder at compression time. + */ +}; /* typedef'd to ZSTD_CDict within "zstd.h" */ + +ZSTD_CCtx* ZSTD_createCCtx(void) +{ + return ZSTD_createCCtx_advanced(ZSTD_defaultCMem); +} + +static void ZSTD_initCCtx(ZSTD_CCtx* cctx, ZSTD_customMem memManager) +{ + assert(cctx != NULL); + ZSTD_memset(cctx, 0, sizeof(*cctx)); + cctx->customMem = memManager; + cctx->bmi2 = ZSTD_cpuid_bmi2(ZSTD_cpuid()); + { size_t const err = ZSTD_CCtx_reset(cctx, ZSTD_reset_parameters); + assert(!ZSTD_isError(err)); + (void)err; + } +} + +ZSTD_CCtx* ZSTD_createCCtx_advanced(ZSTD_customMem customMem) +{ + ZSTD_STATIC_ASSERT(zcss_init==0); + ZSTD_STATIC_ASSERT(ZSTD_CONTENTSIZE_UNKNOWN==(0ULL - 1)); + if ((!customMem.customAlloc) ^ (!customMem.customFree)) return NULL; + { ZSTD_CCtx* const cctx = (ZSTD_CCtx*)ZSTD_customMalloc(sizeof(ZSTD_CCtx), customMem); + if (!cctx) return NULL; + ZSTD_initCCtx(cctx, customMem); + return cctx; + } +} + +ZSTD_CCtx* ZSTD_initStaticCCtx(void* workspace, size_t workspaceSize) +{ + ZSTD_cwksp ws; + ZSTD_CCtx* cctx; + if (workspaceSize <= sizeof(ZSTD_CCtx)) return NULL; /* minimum size */ + if ((size_t)workspace & 7) return NULL; /* must be 8-aligned */ + ZSTD_cwksp_init(&ws, workspace, workspaceSize, ZSTD_cwksp_static_alloc); + + cctx = (ZSTD_CCtx*)ZSTD_cwksp_reserve_object(&ws, sizeof(ZSTD_CCtx)); + if (cctx == NULL) return NULL; + + ZSTD_memset(cctx, 0, sizeof(ZSTD_CCtx)); + ZSTD_cwksp_move(&cctx->workspace, &ws); + cctx->staticSize = workspaceSize; + + /* statically sized space. entropyWorkspace never moves (but prev/next block swap places) */ + if (!ZSTD_cwksp_check_available(&cctx->workspace, ENTROPY_WORKSPACE_SIZE + 2 * sizeof(ZSTD_compressedBlockState_t))) return NULL; + cctx->blockState.prevCBlock = (ZSTD_compressedBlockState_t*)ZSTD_cwksp_reserve_object(&cctx->workspace, sizeof(ZSTD_compressedBlockState_t)); + cctx->blockState.nextCBlock = (ZSTD_compressedBlockState_t*)ZSTD_cwksp_reserve_object(&cctx->workspace, sizeof(ZSTD_compressedBlockState_t)); + cctx->entropyWorkspace = (U32*)ZSTD_cwksp_reserve_object(&cctx->workspace, ENTROPY_WORKSPACE_SIZE); + cctx->bmi2 = ZSTD_cpuid_bmi2(ZSTD_cpuid()); + return cctx; +} + +/** + * Clears and frees all of the dictionaries in the CCtx. + */ +static void ZSTD_clearAllDicts(ZSTD_CCtx* cctx) +{ + ZSTD_customFree(cctx->localDict.dictBuffer, cctx->customMem); + ZSTD_freeCDict(cctx->localDict.cdict); + ZSTD_memset(&cctx->localDict, 0, sizeof(cctx->localDict)); + ZSTD_memset(&cctx->prefixDict, 0, sizeof(cctx->prefixDict)); + cctx->cdict = NULL; +} + +static size_t ZSTD_sizeof_localDict(ZSTD_localDict dict) +{ + size_t const bufferSize = dict.dictBuffer != NULL ? dict.dictSize : 0; + size_t const cdictSize = ZSTD_sizeof_CDict(dict.cdict); + return bufferSize + cdictSize; +} + +static void ZSTD_freeCCtxContent(ZSTD_CCtx* cctx) +{ + assert(cctx != NULL); + assert(cctx->staticSize == 0); + ZSTD_clearAllDicts(cctx); +#ifdef ZSTD_MULTITHREAD + ZSTDMT_freeCCtx(cctx->mtctx); cctx->mtctx = NULL; +#endif + ZSTD_cwksp_free(&cctx->workspace, cctx->customMem); +} + +size_t ZSTD_freeCCtx(ZSTD_CCtx* cctx) +{ + if (cctx==NULL) return 0; /* support free on NULL */ + RETURN_ERROR_IF(cctx->staticSize, memory_allocation, + "not compatible with static CCtx"); + { + int cctxInWorkspace = ZSTD_cwksp_owns_buffer(&cctx->workspace, cctx); + ZSTD_freeCCtxContent(cctx); + if (!cctxInWorkspace) { + ZSTD_customFree(cctx, cctx->customMem); + } + } + return 0; +} + + +static size_t ZSTD_sizeof_mtctx(const ZSTD_CCtx* cctx) +{ +#ifdef ZSTD_MULTITHREAD + return ZSTDMT_sizeof_CCtx(cctx->mtctx); +#else + (void)cctx; + return 0; +#endif +} + + +size_t ZSTD_sizeof_CCtx(const ZSTD_CCtx* cctx) +{ + if (cctx==NULL) return 0; /* support sizeof on NULL */ + /* cctx may be in the workspace */ + return (cctx->workspace.workspace == cctx ? 0 : sizeof(*cctx)) + + ZSTD_cwksp_sizeof(&cctx->workspace) + + ZSTD_sizeof_localDict(cctx->localDict) + + ZSTD_sizeof_mtctx(cctx); +} + +size_t ZSTD_sizeof_CStream(const ZSTD_CStream* zcs) +{ + return ZSTD_sizeof_CCtx(zcs); /* same object */ +} + +/* private API call, for dictBuilder only */ +const seqStore_t* ZSTD_getSeqStore(const ZSTD_CCtx* ctx) { return &(ctx->seqStore); } + +/* Returns true if the strategy supports using a row based matchfinder */ +static int ZSTD_rowMatchFinderSupported(const ZSTD_strategy strategy) { + return (strategy >= ZSTD_greedy && strategy <= ZSTD_lazy2); +} + +/* Returns true if the strategy and useRowMatchFinder mode indicate that we will use the row based matchfinder + * for this compression. + */ +static int ZSTD_rowMatchFinderUsed(const ZSTD_strategy strategy, const ZSTD_useRowMatchFinderMode_e mode) { + assert(mode != ZSTD_urm_auto); + return ZSTD_rowMatchFinderSupported(strategy) && (mode == ZSTD_urm_enableRowMatchFinder); +} + +/* Returns row matchfinder usage enum given an initial mode and cParams */ +static ZSTD_useRowMatchFinderMode_e ZSTD_resolveRowMatchFinderMode(ZSTD_useRowMatchFinderMode_e mode, + const ZSTD_compressionParameters* const cParams) { +#if !defined(ZSTD_NO_INTRINSICS) && (defined(__SSE2__) || defined(__ARM_NEON)) + int const kHasSIMD128 = 1; +#else + int const kHasSIMD128 = 0; +#endif + if (mode != ZSTD_urm_auto) return mode; /* if requested enabled, but no SIMD, we still will use row matchfinder */ + mode = ZSTD_urm_disableRowMatchFinder; + if (!ZSTD_rowMatchFinderSupported(cParams->strategy)) return mode; + if (kHasSIMD128) { + if (cParams->windowLog > 14) mode = ZSTD_urm_enableRowMatchFinder; + } else { + if (cParams->windowLog > 17) mode = ZSTD_urm_enableRowMatchFinder; + } + return mode; +} + +/* Returns 1 if the arguments indicate that we should allocate a chainTable, 0 otherwise */ +static int ZSTD_allocateChainTable(const ZSTD_strategy strategy, + const ZSTD_useRowMatchFinderMode_e useRowMatchFinder, + const U32 forDDSDict) { + assert(useRowMatchFinder != ZSTD_urm_auto); + /* We always should allocate a chaintable if we are allocating a matchstate for a DDS dictionary matchstate. + * We do not allocate a chaintable if we are using ZSTD_fast, or are using the row-based matchfinder. + */ + return forDDSDict || ((strategy != ZSTD_fast) && !ZSTD_rowMatchFinderUsed(strategy, useRowMatchFinder)); +} + +/* Returns 1 if compression parameters are such that we should + * enable long distance matching (wlog >= 27, strategy >= btopt). + * Returns 0 otherwise. + */ +static U32 ZSTD_CParams_shouldEnableLdm(const ZSTD_compressionParameters* const cParams) { + return cParams->strategy >= ZSTD_btopt && cParams->windowLog >= 27; +} + +/* Returns 1 if compression parameters are such that we should + * enable blockSplitter (wlog >= 17, strategy >= btopt). + * Returns 0 otherwise. + */ +static U32 ZSTD_CParams_useBlockSplitter(const ZSTD_compressionParameters* const cParams) { + return cParams->strategy >= ZSTD_btopt && cParams->windowLog >= 17; +} + +static ZSTD_CCtx_params ZSTD_makeCCtxParamsFromCParams( + ZSTD_compressionParameters cParams) +{ + ZSTD_CCtx_params cctxParams; + /* should not matter, as all cParams are presumed properly defined */ + ZSTD_CCtxParams_init(&cctxParams, ZSTD_CLEVEL_DEFAULT); + cctxParams.cParams = cParams; + + /* Adjust advanced params according to cParams */ + if (ZSTD_CParams_shouldEnableLdm(&cParams)) { + DEBUGLOG(4, "ZSTD_makeCCtxParamsFromCParams(): Including LDM into cctx params"); + cctxParams.ldmParams.enableLdm = 1; + /* LDM is enabled by default for optimal parser and window size >= 128MB */ + ZSTD_ldm_adjustParameters(&cctxParams.ldmParams, &cParams); + assert(cctxParams.ldmParams.hashLog >= cctxParams.ldmParams.bucketSizeLog); + assert(cctxParams.ldmParams.hashRateLog < 32); + } + + if (ZSTD_CParams_useBlockSplitter(&cParams)) { + DEBUGLOG(4, "ZSTD_makeCCtxParamsFromCParams(): Including block splitting into cctx params"); + cctxParams.splitBlocks = 1; + } + + cctxParams.useRowMatchFinder = ZSTD_resolveRowMatchFinderMode(cctxParams.useRowMatchFinder, &cParams); + assert(!ZSTD_checkCParams(cParams)); + return cctxParams; +} + +static ZSTD_CCtx_params* ZSTD_createCCtxParams_advanced( + ZSTD_customMem customMem) +{ + ZSTD_CCtx_params* params; + if ((!customMem.customAlloc) ^ (!customMem.customFree)) return NULL; + params = (ZSTD_CCtx_params*)ZSTD_customCalloc( + sizeof(ZSTD_CCtx_params), customMem); + if (!params) { return NULL; } + ZSTD_CCtxParams_init(params, ZSTD_CLEVEL_DEFAULT); + params->customMem = customMem; + return params; +} + +ZSTD_CCtx_params* ZSTD_createCCtxParams(void) +{ + return ZSTD_createCCtxParams_advanced(ZSTD_defaultCMem); +} + +size_t ZSTD_freeCCtxParams(ZSTD_CCtx_params* params) +{ + if (params == NULL) { return 0; } + ZSTD_customFree(params, params->customMem); + return 0; +} + +size_t ZSTD_CCtxParams_reset(ZSTD_CCtx_params* params) +{ + return ZSTD_CCtxParams_init(params, ZSTD_CLEVEL_DEFAULT); +} + +size_t ZSTD_CCtxParams_init(ZSTD_CCtx_params* cctxParams, int compressionLevel) { + RETURN_ERROR_IF(!cctxParams, GENERIC, "NULL pointer!"); + ZSTD_memset(cctxParams, 0, sizeof(*cctxParams)); + cctxParams->compressionLevel = compressionLevel; + cctxParams->fParams.contentSizeFlag = 1; + return 0; +} + +#define ZSTD_NO_CLEVEL 0 + +/** + * Initializes the cctxParams from params and compressionLevel. + * @param compressionLevel If params are derived from a compression level then that compression level, otherwise ZSTD_NO_CLEVEL. + */ +static void ZSTD_CCtxParams_init_internal(ZSTD_CCtx_params* cctxParams, ZSTD_parameters const* params, int compressionLevel) +{ + assert(!ZSTD_checkCParams(params->cParams)); + ZSTD_memset(cctxParams, 0, sizeof(*cctxParams)); + cctxParams->cParams = params->cParams; + cctxParams->fParams = params->fParams; + /* Should not matter, as all cParams are presumed properly defined. + * But, set it for tracing anyway. + */ + cctxParams->compressionLevel = compressionLevel; + cctxParams->useRowMatchFinder = ZSTD_resolveRowMatchFinderMode(cctxParams->useRowMatchFinder, ¶ms->cParams); + DEBUGLOG(4, "ZSTD_CCtxParams_init_internal: useRowMatchFinder=%d", cctxParams->useRowMatchFinder); +} + +size_t ZSTD_CCtxParams_init_advanced(ZSTD_CCtx_params* cctxParams, ZSTD_parameters params) +{ + RETURN_ERROR_IF(!cctxParams, GENERIC, "NULL pointer!"); + FORWARD_IF_ERROR( ZSTD_checkCParams(params.cParams) , ""); + ZSTD_CCtxParams_init_internal(cctxParams, ¶ms, ZSTD_NO_CLEVEL); + return 0; +} + +/** + * Sets cctxParams' cParams and fParams from params, but otherwise leaves them alone. + * @param param Validated zstd parameters. + */ +static void ZSTD_CCtxParams_setZstdParams( + ZSTD_CCtx_params* cctxParams, const ZSTD_parameters* params) +{ + assert(!ZSTD_checkCParams(params->cParams)); + cctxParams->cParams = params->cParams; + cctxParams->fParams = params->fParams; + /* Should not matter, as all cParams are presumed properly defined. + * But, set it for tracing anyway. + */ + cctxParams->compressionLevel = ZSTD_NO_CLEVEL; +} + +ZSTD_bounds ZSTD_cParam_getBounds(ZSTD_cParameter param) +{ + ZSTD_bounds bounds = { 0, 0, 0 }; + + switch(param) + { + case ZSTD_c_compressionLevel: + bounds.lowerBound = ZSTD_minCLevel(); + bounds.upperBound = ZSTD_maxCLevel(); + return bounds; + + case ZSTD_c_windowLog: + bounds.lowerBound = ZSTD_WINDOWLOG_MIN; + bounds.upperBound = ZSTD_WINDOWLOG_MAX; + return bounds; + + case ZSTD_c_hashLog: + bounds.lowerBound = ZSTD_HASHLOG_MIN; + bounds.upperBound = ZSTD_HASHLOG_MAX; + return bounds; + + case ZSTD_c_chainLog: + bounds.lowerBound = ZSTD_CHAINLOG_MIN; + bounds.upperBound = ZSTD_CHAINLOG_MAX; + return bounds; + + case ZSTD_c_searchLog: + bounds.lowerBound = ZSTD_SEARCHLOG_MIN; + bounds.upperBound = ZSTD_SEARCHLOG_MAX; + return bounds; + + case ZSTD_c_minMatch: + bounds.lowerBound = ZSTD_MINMATCH_MIN; + bounds.upperBound = ZSTD_MINMATCH_MAX; + return bounds; + + case ZSTD_c_targetLength: + bounds.lowerBound = ZSTD_TARGETLENGTH_MIN; + bounds.upperBound = ZSTD_TARGETLENGTH_MAX; + return bounds; + + case ZSTD_c_strategy: + bounds.lowerBound = ZSTD_STRATEGY_MIN; + bounds.upperBound = ZSTD_STRATEGY_MAX; + return bounds; + + case ZSTD_c_contentSizeFlag: + bounds.lowerBound = 0; + bounds.upperBound = 1; + return bounds; + + case ZSTD_c_checksumFlag: + bounds.lowerBound = 0; + bounds.upperBound = 1; + return bounds; + + case ZSTD_c_dictIDFlag: + bounds.lowerBound = 0; + bounds.upperBound = 1; + return bounds; + + case ZSTD_c_nbWorkers: + bounds.lowerBound = 0; +#ifdef ZSTD_MULTITHREAD + bounds.upperBound = ZSTDMT_NBWORKERS_MAX; +#else + bounds.upperBound = 0; +#endif + return bounds; + + case ZSTD_c_jobSize: + bounds.lowerBound = 0; +#ifdef ZSTD_MULTITHREAD + bounds.upperBound = ZSTDMT_JOBSIZE_MAX; +#else + bounds.upperBound = 0; +#endif + return bounds; + + case ZSTD_c_overlapLog: +#ifdef ZSTD_MULTITHREAD + bounds.lowerBound = ZSTD_OVERLAPLOG_MIN; + bounds.upperBound = ZSTD_OVERLAPLOG_MAX; +#else + bounds.lowerBound = 0; + bounds.upperBound = 0; +#endif + return bounds; + + case ZSTD_c_enableDedicatedDictSearch: + bounds.lowerBound = 0; + bounds.upperBound = 1; + return bounds; + + case ZSTD_c_enableLongDistanceMatching: + bounds.lowerBound = 0; + bounds.upperBound = 1; + return bounds; + + case ZSTD_c_ldmHashLog: + bounds.lowerBound = ZSTD_LDM_HASHLOG_MIN; + bounds.upperBound = ZSTD_LDM_HASHLOG_MAX; + return bounds; + + case ZSTD_c_ldmMinMatch: + bounds.lowerBound = ZSTD_LDM_MINMATCH_MIN; + bounds.upperBound = ZSTD_LDM_MINMATCH_MAX; + return bounds; + + case ZSTD_c_ldmBucketSizeLog: + bounds.lowerBound = ZSTD_LDM_BUCKETSIZELOG_MIN; + bounds.upperBound = ZSTD_LDM_BUCKETSIZELOG_MAX; + return bounds; + + case ZSTD_c_ldmHashRateLog: + bounds.lowerBound = ZSTD_LDM_HASHRATELOG_MIN; + bounds.upperBound = ZSTD_LDM_HASHRATELOG_MAX; + return bounds; + + /* experimental parameters */ + case ZSTD_c_rsyncable: + bounds.lowerBound = 0; + bounds.upperBound = 1; + return bounds; + + case ZSTD_c_forceMaxWindow : + bounds.lowerBound = 0; + bounds.upperBound = 1; + return bounds; + + case ZSTD_c_format: + ZSTD_STATIC_ASSERT(ZSTD_f_zstd1 < ZSTD_f_zstd1_magicless); + bounds.lowerBound = ZSTD_f_zstd1; + bounds.upperBound = ZSTD_f_zstd1_magicless; /* note : how to ensure at compile time that this is the highest value enum ? */ + return bounds; + + case ZSTD_c_forceAttachDict: + ZSTD_STATIC_ASSERT(ZSTD_dictDefaultAttach < ZSTD_dictForceLoad); + bounds.lowerBound = ZSTD_dictDefaultAttach; + bounds.upperBound = ZSTD_dictForceLoad; /* note : how to ensure at compile time that this is the highest value enum ? */ + return bounds; + + case ZSTD_c_literalCompressionMode: + ZSTD_STATIC_ASSERT(ZSTD_lcm_auto < ZSTD_lcm_huffman && ZSTD_lcm_huffman < ZSTD_lcm_uncompressed); + bounds.lowerBound = ZSTD_lcm_auto; + bounds.upperBound = ZSTD_lcm_uncompressed; + return bounds; + + case ZSTD_c_targetCBlockSize: + bounds.lowerBound = ZSTD_TARGETCBLOCKSIZE_MIN; + bounds.upperBound = ZSTD_TARGETCBLOCKSIZE_MAX; + return bounds; + + case ZSTD_c_srcSizeHint: + bounds.lowerBound = ZSTD_SRCSIZEHINT_MIN; + bounds.upperBound = ZSTD_SRCSIZEHINT_MAX; + return bounds; + + case ZSTD_c_stableInBuffer: + case ZSTD_c_stableOutBuffer: + bounds.lowerBound = (int)ZSTD_bm_buffered; + bounds.upperBound = (int)ZSTD_bm_stable; + return bounds; + + case ZSTD_c_blockDelimiters: + bounds.lowerBound = (int)ZSTD_sf_noBlockDelimiters; + bounds.upperBound = (int)ZSTD_sf_explicitBlockDelimiters; + return bounds; + + case ZSTD_c_validateSequences: + bounds.lowerBound = 0; + bounds.upperBound = 1; + return bounds; + + case ZSTD_c_splitBlocks: + bounds.lowerBound = 0; + bounds.upperBound = 1; + return bounds; + + case ZSTD_c_useRowMatchFinder: + bounds.lowerBound = (int)ZSTD_urm_auto; + bounds.upperBound = (int)ZSTD_urm_enableRowMatchFinder; + return bounds; + + case ZSTD_c_deterministicRefPrefix: + bounds.lowerBound = 0; + bounds.upperBound = 1; + return bounds; + + default: + bounds.error = ERROR(parameter_unsupported); + return bounds; + } +} + +/* ZSTD_cParam_clampBounds: + * Clamps the value into the bounded range. + */ +static size_t ZSTD_cParam_clampBounds(ZSTD_cParameter cParam, int* value) +{ + ZSTD_bounds const bounds = ZSTD_cParam_getBounds(cParam); + if (ZSTD_isError(bounds.error)) return bounds.error; + if (*value < bounds.lowerBound) *value = bounds.lowerBound; + if (*value > bounds.upperBound) *value = bounds.upperBound; + return 0; +} + +#define BOUNDCHECK(cParam, val) { \ + RETURN_ERROR_IF(!ZSTD_cParam_withinBounds(cParam,val), \ + parameter_outOfBound, "Param out of bounds"); \ +} + + +static int ZSTD_isUpdateAuthorized(ZSTD_cParameter param) +{ + switch(param) + { + case ZSTD_c_compressionLevel: + case ZSTD_c_hashLog: + case ZSTD_c_chainLog: + case ZSTD_c_searchLog: + case ZSTD_c_minMatch: + case ZSTD_c_targetLength: + case ZSTD_c_strategy: + return 1; + + case ZSTD_c_format: + case ZSTD_c_windowLog: + case ZSTD_c_contentSizeFlag: + case ZSTD_c_checksumFlag: + case ZSTD_c_dictIDFlag: + case ZSTD_c_forceMaxWindow : + case ZSTD_c_nbWorkers: + case ZSTD_c_jobSize: + case ZSTD_c_overlapLog: + case ZSTD_c_rsyncable: + case ZSTD_c_enableDedicatedDictSearch: + case ZSTD_c_enableLongDistanceMatching: + case ZSTD_c_ldmHashLog: + case ZSTD_c_ldmMinMatch: + case ZSTD_c_ldmBucketSizeLog: + case ZSTD_c_ldmHashRateLog: + case ZSTD_c_forceAttachDict: + case ZSTD_c_literalCompressionMode: + case ZSTD_c_targetCBlockSize: + case ZSTD_c_srcSizeHint: + case ZSTD_c_stableInBuffer: + case ZSTD_c_stableOutBuffer: + case ZSTD_c_blockDelimiters: + case ZSTD_c_validateSequences: + case ZSTD_c_splitBlocks: + case ZSTD_c_useRowMatchFinder: + case ZSTD_c_deterministicRefPrefix: + default: + return 0; + } +} + +size_t ZSTD_CCtx_setParameter(ZSTD_CCtx* cctx, ZSTD_cParameter param, int value) +{ + DEBUGLOG(4, "ZSTD_CCtx_setParameter (%i, %i)", (int)param, value); + if (cctx->streamStage != zcss_init) { + if (ZSTD_isUpdateAuthorized(param)) { + cctx->cParamsChanged = 1; + } else { + RETURN_ERROR(stage_wrong, "can only set params in ctx init stage"); + } } + + switch(param) + { + case ZSTD_c_nbWorkers: + RETURN_ERROR_IF((value!=0) && cctx->staticSize, parameter_unsupported, + "MT not compatible with static alloc"); + break; + + case ZSTD_c_compressionLevel: + case ZSTD_c_windowLog: + case ZSTD_c_hashLog: + case ZSTD_c_chainLog: + case ZSTD_c_searchLog: + case ZSTD_c_minMatch: + case ZSTD_c_targetLength: + case ZSTD_c_strategy: + case ZSTD_c_ldmHashRateLog: + case ZSTD_c_format: + case ZSTD_c_contentSizeFlag: + case ZSTD_c_checksumFlag: + case ZSTD_c_dictIDFlag: + case ZSTD_c_forceMaxWindow: + case ZSTD_c_forceAttachDict: + case ZSTD_c_literalCompressionMode: + case ZSTD_c_jobSize: + case ZSTD_c_overlapLog: + case ZSTD_c_rsyncable: + case ZSTD_c_enableDedicatedDictSearch: + case ZSTD_c_enableLongDistanceMatching: + case ZSTD_c_ldmHashLog: + case ZSTD_c_ldmMinMatch: + case ZSTD_c_ldmBucketSizeLog: + case ZSTD_c_targetCBlockSize: + case ZSTD_c_srcSizeHint: + case ZSTD_c_stableInBuffer: + case ZSTD_c_stableOutBuffer: + case ZSTD_c_blockDelimiters: + case ZSTD_c_validateSequences: + case ZSTD_c_splitBlocks: + case ZSTD_c_useRowMatchFinder: + case ZSTD_c_deterministicRefPrefix: + break; + + default: RETURN_ERROR(parameter_unsupported, "unknown parameter"); + } + return ZSTD_CCtxParams_setParameter(&cctx->requestedParams, param, value); +} + +size_t ZSTD_CCtxParams_setParameter(ZSTD_CCtx_params* CCtxParams, + ZSTD_cParameter param, int value) +{ + DEBUGLOG(4, "ZSTD_CCtxParams_setParameter (%i, %i)", (int)param, value); + switch(param) + { + case ZSTD_c_format : + BOUNDCHECK(ZSTD_c_format, value); + CCtxParams->format = (ZSTD_format_e)value; + return (size_t)CCtxParams->format; + + case ZSTD_c_compressionLevel : { + FORWARD_IF_ERROR(ZSTD_cParam_clampBounds(param, &value), ""); + if (value == 0) + CCtxParams->compressionLevel = ZSTD_CLEVEL_DEFAULT; /* 0 == default */ + else + CCtxParams->compressionLevel = value; + if (CCtxParams->compressionLevel >= 0) return (size_t)CCtxParams->compressionLevel; + return 0; /* return type (size_t) cannot represent negative values */ + } + + case ZSTD_c_windowLog : + if (value!=0) /* 0 => use default */ + BOUNDCHECK(ZSTD_c_windowLog, value); + CCtxParams->cParams.windowLog = (U32)value; + return CCtxParams->cParams.windowLog; + + case ZSTD_c_hashLog : + if (value!=0) /* 0 => use default */ + BOUNDCHECK(ZSTD_c_hashLog, value); + CCtxParams->cParams.hashLog = (U32)value; + return CCtxParams->cParams.hashLog; + + case ZSTD_c_chainLog : + if (value!=0) /* 0 => use default */ + BOUNDCHECK(ZSTD_c_chainLog, value); + CCtxParams->cParams.chainLog = (U32)value; + return CCtxParams->cParams.chainLog; + + case ZSTD_c_searchLog : + if (value!=0) /* 0 => use default */ + BOUNDCHECK(ZSTD_c_searchLog, value); + CCtxParams->cParams.searchLog = (U32)value; + return (size_t)value; + + case ZSTD_c_minMatch : + if (value!=0) /* 0 => use default */ + BOUNDCHECK(ZSTD_c_minMatch, value); + CCtxParams->cParams.minMatch = value; + return CCtxParams->cParams.minMatch; + + case ZSTD_c_targetLength : + BOUNDCHECK(ZSTD_c_targetLength, value); + CCtxParams->cParams.targetLength = value; + return CCtxParams->cParams.targetLength; + + case ZSTD_c_strategy : + if (value!=0) /* 0 => use default */ + BOUNDCHECK(ZSTD_c_strategy, value); + CCtxParams->cParams.strategy = (ZSTD_strategy)value; + return (size_t)CCtxParams->cParams.strategy; + + case ZSTD_c_contentSizeFlag : + /* Content size written in frame header _when known_ (default:1) */ + DEBUGLOG(4, "set content size flag = %u", (value!=0)); + CCtxParams->fParams.contentSizeFlag = value != 0; + return CCtxParams->fParams.contentSizeFlag; + + case ZSTD_c_checksumFlag : + /* A 32-bits content checksum will be calculated and written at end of frame (default:0) */ + CCtxParams->fParams.checksumFlag = value != 0; + return CCtxParams->fParams.checksumFlag; + + case ZSTD_c_dictIDFlag : /* When applicable, dictionary's dictID is provided in frame header (default:1) */ + DEBUGLOG(4, "set dictIDFlag = %u", (value!=0)); + CCtxParams->fParams.noDictIDFlag = !value; + return !CCtxParams->fParams.noDictIDFlag; + + case ZSTD_c_forceMaxWindow : + CCtxParams->forceWindow = (value != 0); + return CCtxParams->forceWindow; + + case ZSTD_c_forceAttachDict : { + const ZSTD_dictAttachPref_e pref = (ZSTD_dictAttachPref_e)value; + BOUNDCHECK(ZSTD_c_forceAttachDict, pref); + CCtxParams->attachDictPref = pref; + return CCtxParams->attachDictPref; + } + + case ZSTD_c_literalCompressionMode : { + const ZSTD_literalCompressionMode_e lcm = (ZSTD_literalCompressionMode_e)value; + BOUNDCHECK(ZSTD_c_literalCompressionMode, lcm); + CCtxParams->literalCompressionMode = lcm; + return CCtxParams->literalCompressionMode; + } + + case ZSTD_c_nbWorkers : +#ifndef ZSTD_MULTITHREAD + RETURN_ERROR_IF(value!=0, parameter_unsupported, "not compiled with multithreading"); + return 0; +#else + FORWARD_IF_ERROR(ZSTD_cParam_clampBounds(param, &value), ""); + CCtxParams->nbWorkers = value; + return CCtxParams->nbWorkers; +#endif + + case ZSTD_c_jobSize : +#ifndef ZSTD_MULTITHREAD + RETURN_ERROR_IF(value!=0, parameter_unsupported, "not compiled with multithreading"); + return 0; +#else + /* Adjust to the minimum non-default value. */ + if (value != 0 && value < ZSTDMT_JOBSIZE_MIN) + value = ZSTDMT_JOBSIZE_MIN; + FORWARD_IF_ERROR(ZSTD_cParam_clampBounds(param, &value), ""); + assert(value >= 0); + CCtxParams->jobSize = value; + return CCtxParams->jobSize; +#endif + + case ZSTD_c_overlapLog : +#ifndef ZSTD_MULTITHREAD + RETURN_ERROR_IF(value!=0, parameter_unsupported, "not compiled with multithreading"); + return 0; +#else + FORWARD_IF_ERROR(ZSTD_cParam_clampBounds(ZSTD_c_overlapLog, &value), ""); + CCtxParams->overlapLog = value; + return CCtxParams->overlapLog; +#endif + + case ZSTD_c_rsyncable : +#ifndef ZSTD_MULTITHREAD + RETURN_ERROR_IF(value!=0, parameter_unsupported, "not compiled with multithreading"); + return 0; +#else + FORWARD_IF_ERROR(ZSTD_cParam_clampBounds(ZSTD_c_overlapLog, &value), ""); + CCtxParams->rsyncable = value; + return CCtxParams->rsyncable; +#endif + + case ZSTD_c_enableDedicatedDictSearch : + CCtxParams->enableDedicatedDictSearch = (value!=0); + return CCtxParams->enableDedicatedDictSearch; + + case ZSTD_c_enableLongDistanceMatching : + CCtxParams->ldmParams.enableLdm = (value!=0); + return CCtxParams->ldmParams.enableLdm; + + case ZSTD_c_ldmHashLog : + if (value!=0) /* 0 ==> auto */ + BOUNDCHECK(ZSTD_c_ldmHashLog, value); + CCtxParams->ldmParams.hashLog = value; + return CCtxParams->ldmParams.hashLog; + + case ZSTD_c_ldmMinMatch : + if (value!=0) /* 0 ==> default */ + BOUNDCHECK(ZSTD_c_ldmMinMatch, value); + CCtxParams->ldmParams.minMatchLength = value; + return CCtxParams->ldmParams.minMatchLength; + + case ZSTD_c_ldmBucketSizeLog : + if (value!=0) /* 0 ==> default */ + BOUNDCHECK(ZSTD_c_ldmBucketSizeLog, value); + CCtxParams->ldmParams.bucketSizeLog = value; + return CCtxParams->ldmParams.bucketSizeLog; + + case ZSTD_c_ldmHashRateLog : + RETURN_ERROR_IF(value > ZSTD_WINDOWLOG_MAX - ZSTD_HASHLOG_MIN, + parameter_outOfBound, "Param out of bounds!"); + CCtxParams->ldmParams.hashRateLog = value; + return CCtxParams->ldmParams.hashRateLog; + + case ZSTD_c_targetCBlockSize : + if (value!=0) /* 0 ==> default */ + BOUNDCHECK(ZSTD_c_targetCBlockSize, value); + CCtxParams->targetCBlockSize = value; + return CCtxParams->targetCBlockSize; + + case ZSTD_c_srcSizeHint : + if (value!=0) /* 0 ==> default */ + BOUNDCHECK(ZSTD_c_srcSizeHint, value); + CCtxParams->srcSizeHint = value; + return CCtxParams->srcSizeHint; + + case ZSTD_c_stableInBuffer: + BOUNDCHECK(ZSTD_c_stableInBuffer, value); + CCtxParams->inBufferMode = (ZSTD_bufferMode_e)value; + return CCtxParams->inBufferMode; + + case ZSTD_c_stableOutBuffer: + BOUNDCHECK(ZSTD_c_stableOutBuffer, value); + CCtxParams->outBufferMode = (ZSTD_bufferMode_e)value; + return CCtxParams->outBufferMode; + + case ZSTD_c_blockDelimiters: + BOUNDCHECK(ZSTD_c_blockDelimiters, value); + CCtxParams->blockDelimiters = (ZSTD_sequenceFormat_e)value; + return CCtxParams->blockDelimiters; + + case ZSTD_c_validateSequences: + BOUNDCHECK(ZSTD_c_validateSequences, value); + CCtxParams->validateSequences = value; + return CCtxParams->validateSequences; + + case ZSTD_c_splitBlocks: + BOUNDCHECK(ZSTD_c_splitBlocks, value); + CCtxParams->splitBlocks = value; + return CCtxParams->splitBlocks; + + case ZSTD_c_useRowMatchFinder: + BOUNDCHECK(ZSTD_c_useRowMatchFinder, value); + CCtxParams->useRowMatchFinder = (ZSTD_useRowMatchFinderMode_e)value; + return CCtxParams->useRowMatchFinder; + + case ZSTD_c_deterministicRefPrefix: + BOUNDCHECK(ZSTD_c_deterministicRefPrefix, value); + CCtxParams->deterministicRefPrefix = !!value; + return CCtxParams->deterministicRefPrefix; + + default: RETURN_ERROR(parameter_unsupported, "unknown parameter"); + } +} + +size_t ZSTD_CCtx_getParameter(ZSTD_CCtx const* cctx, ZSTD_cParameter param, int* value) +{ + return ZSTD_CCtxParams_getParameter(&cctx->requestedParams, param, value); +} + +size_t ZSTD_CCtxParams_getParameter( + ZSTD_CCtx_params const* CCtxParams, ZSTD_cParameter param, int* value) +{ + switch(param) + { + case ZSTD_c_format : + *value = CCtxParams->format; + break; + case ZSTD_c_compressionLevel : + *value = CCtxParams->compressionLevel; + break; + case ZSTD_c_windowLog : + *value = (int)CCtxParams->cParams.windowLog; + break; + case ZSTD_c_hashLog : + *value = (int)CCtxParams->cParams.hashLog; + break; + case ZSTD_c_chainLog : + *value = (int)CCtxParams->cParams.chainLog; + break; + case ZSTD_c_searchLog : + *value = CCtxParams->cParams.searchLog; + break; + case ZSTD_c_minMatch : + *value = CCtxParams->cParams.minMatch; + break; + case ZSTD_c_targetLength : + *value = CCtxParams->cParams.targetLength; + break; + case ZSTD_c_strategy : + *value = (unsigned)CCtxParams->cParams.strategy; + break; + case ZSTD_c_contentSizeFlag : + *value = CCtxParams->fParams.contentSizeFlag; + break; + case ZSTD_c_checksumFlag : + *value = CCtxParams->fParams.checksumFlag; + break; + case ZSTD_c_dictIDFlag : + *value = !CCtxParams->fParams.noDictIDFlag; + break; + case ZSTD_c_forceMaxWindow : + *value = CCtxParams->forceWindow; + break; + case ZSTD_c_forceAttachDict : + *value = CCtxParams->attachDictPref; + break; + case ZSTD_c_literalCompressionMode : + *value = CCtxParams->literalCompressionMode; + break; + case ZSTD_c_nbWorkers : +#ifndef ZSTD_MULTITHREAD + assert(CCtxParams->nbWorkers == 0); +#endif + *value = CCtxParams->nbWorkers; + break; + case ZSTD_c_jobSize : +#ifndef ZSTD_MULTITHREAD + RETURN_ERROR(parameter_unsupported, "not compiled with multithreading"); +#else + assert(CCtxParams->jobSize <= INT_MAX); + *value = (int)CCtxParams->jobSize; + break; +#endif + case ZSTD_c_overlapLog : +#ifndef ZSTD_MULTITHREAD + RETURN_ERROR(parameter_unsupported, "not compiled with multithreading"); +#else + *value = CCtxParams->overlapLog; + break; +#endif + case ZSTD_c_rsyncable : +#ifndef ZSTD_MULTITHREAD + RETURN_ERROR(parameter_unsupported, "not compiled with multithreading"); +#else + *value = CCtxParams->rsyncable; + break; +#endif + case ZSTD_c_enableDedicatedDictSearch : + *value = CCtxParams->enableDedicatedDictSearch; + break; + case ZSTD_c_enableLongDistanceMatching : + *value = CCtxParams->ldmParams.enableLdm; + break; + case ZSTD_c_ldmHashLog : + *value = CCtxParams->ldmParams.hashLog; + break; + case ZSTD_c_ldmMinMatch : + *value = CCtxParams->ldmParams.minMatchLength; + break; + case ZSTD_c_ldmBucketSizeLog : + *value = CCtxParams->ldmParams.bucketSizeLog; + break; + case ZSTD_c_ldmHashRateLog : + *value = CCtxParams->ldmParams.hashRateLog; + break; + case ZSTD_c_targetCBlockSize : + *value = (int)CCtxParams->targetCBlockSize; + break; + case ZSTD_c_srcSizeHint : + *value = (int)CCtxParams->srcSizeHint; + break; + case ZSTD_c_stableInBuffer : + *value = (int)CCtxParams->inBufferMode; + break; + case ZSTD_c_stableOutBuffer : + *value = (int)CCtxParams->outBufferMode; + break; + case ZSTD_c_blockDelimiters : + *value = (int)CCtxParams->blockDelimiters; + break; + case ZSTD_c_validateSequences : + *value = (int)CCtxParams->validateSequences; + break; + case ZSTD_c_splitBlocks : + *value = (int)CCtxParams->splitBlocks; + break; + case ZSTD_c_useRowMatchFinder : + *value = (int)CCtxParams->useRowMatchFinder; + break; + case ZSTD_c_deterministicRefPrefix: + *value = (int)CCtxParams->deterministicRefPrefix; + break; + default: RETURN_ERROR(parameter_unsupported, "unknown parameter"); + } + return 0; +} + +/** ZSTD_CCtx_setParametersUsingCCtxParams() : + * just applies `params` into `cctx` + * no action is performed, parameters are merely stored. + * If ZSTDMT is enabled, parameters are pushed to cctx->mtctx. + * This is possible even if a compression is ongoing. + * In which case, new parameters will be applied on the fly, starting with next compression job. + */ +size_t ZSTD_CCtx_setParametersUsingCCtxParams( + ZSTD_CCtx* cctx, const ZSTD_CCtx_params* params) +{ + DEBUGLOG(4, "ZSTD_CCtx_setParametersUsingCCtxParams"); + RETURN_ERROR_IF(cctx->streamStage != zcss_init, stage_wrong, + "The context is in the wrong stage!"); + RETURN_ERROR_IF(cctx->cdict, stage_wrong, + "Can't override parameters with cdict attached (some must " + "be inherited from the cdict)."); + + cctx->requestedParams = *params; + return 0; +} + +ZSTDLIB_API size_t ZSTD_CCtx_setPledgedSrcSize(ZSTD_CCtx* cctx, unsigned long long pledgedSrcSize) +{ + DEBUGLOG(4, "ZSTD_CCtx_setPledgedSrcSize to %u bytes", (U32)pledgedSrcSize); + RETURN_ERROR_IF(cctx->streamStage != zcss_init, stage_wrong, + "Can't set pledgedSrcSize when not in init stage."); + cctx->pledgedSrcSizePlusOne = pledgedSrcSize+1; + return 0; +} + +static ZSTD_compressionParameters ZSTD_dedicatedDictSearch_getCParams( + int const compressionLevel, + size_t const dictSize); +static int ZSTD_dedicatedDictSearch_isSupported( + const ZSTD_compressionParameters* cParams); +static void ZSTD_dedicatedDictSearch_revertCParams( + ZSTD_compressionParameters* cParams); + +/** + * Initializes the local dict using the requested parameters. + * NOTE: This does not use the pledged src size, because it may be used for more + * than one compression. + */ +static size_t ZSTD_initLocalDict(ZSTD_CCtx* cctx) +{ + ZSTD_localDict* const dl = &cctx->localDict; + if (dl->dict == NULL) { + /* No local dictionary. */ + assert(dl->dictBuffer == NULL); + assert(dl->cdict == NULL); + assert(dl->dictSize == 0); + return 0; + } + if (dl->cdict != NULL) { + assert(cctx->cdict == dl->cdict); + /* Local dictionary already initialized. */ + return 0; + } + assert(dl->dictSize > 0); + assert(cctx->cdict == NULL); + assert(cctx->prefixDict.dict == NULL); + + dl->cdict = ZSTD_createCDict_advanced2( + dl->dict, + dl->dictSize, + ZSTD_dlm_byRef, + dl->dictContentType, + &cctx->requestedParams, + cctx->customMem); + RETURN_ERROR_IF(!dl->cdict, memory_allocation, "ZSTD_createCDict_advanced failed"); + cctx->cdict = dl->cdict; + return 0; +} + +size_t ZSTD_CCtx_loadDictionary_advanced( + ZSTD_CCtx* cctx, const void* dict, size_t dictSize, + ZSTD_dictLoadMethod_e dictLoadMethod, ZSTD_dictContentType_e dictContentType) +{ + RETURN_ERROR_IF(cctx->streamStage != zcss_init, stage_wrong, + "Can't load a dictionary when ctx is not in init stage."); + DEBUGLOG(4, "ZSTD_CCtx_loadDictionary_advanced (size: %u)", (U32)dictSize); + ZSTD_clearAllDicts(cctx); /* in case one already exists */ + if (dict == NULL || dictSize == 0) /* no dictionary mode */ + return 0; + if (dictLoadMethod == ZSTD_dlm_byRef) { + cctx->localDict.dict = dict; + } else { + void* dictBuffer; + RETURN_ERROR_IF(cctx->staticSize, memory_allocation, + "no malloc for static CCtx"); + dictBuffer = ZSTD_customMalloc(dictSize, cctx->customMem); + RETURN_ERROR_IF(!dictBuffer, memory_allocation, "NULL pointer!"); + ZSTD_memcpy(dictBuffer, dict, dictSize); + cctx->localDict.dictBuffer = dictBuffer; + cctx->localDict.dict = dictBuffer; + } + cctx->localDict.dictSize = dictSize; + cctx->localDict.dictContentType = dictContentType; + return 0; +} + +ZSTDLIB_API size_t ZSTD_CCtx_loadDictionary_byReference( + ZSTD_CCtx* cctx, const void* dict, size_t dictSize) +{ + return ZSTD_CCtx_loadDictionary_advanced( + cctx, dict, dictSize, ZSTD_dlm_byRef, ZSTD_dct_auto); +} + +ZSTDLIB_API size_t ZSTD_CCtx_loadDictionary(ZSTD_CCtx* cctx, const void* dict, size_t dictSize) +{ + return ZSTD_CCtx_loadDictionary_advanced( + cctx, dict, dictSize, ZSTD_dlm_byCopy, ZSTD_dct_auto); +} + + +size_t ZSTD_CCtx_refCDict(ZSTD_CCtx* cctx, const ZSTD_CDict* cdict) +{ + RETURN_ERROR_IF(cctx->streamStage != zcss_init, stage_wrong, + "Can't ref a dict when ctx not in init stage."); + /* Free the existing local cdict (if any) to save memory. */ + ZSTD_clearAllDicts(cctx); + cctx->cdict = cdict; + return 0; +} + +size_t ZSTD_CCtx_refThreadPool(ZSTD_CCtx* cctx, ZSTD_threadPool* pool) +{ + RETURN_ERROR_IF(cctx->streamStage != zcss_init, stage_wrong, + "Can't ref a pool when ctx not in init stage."); + cctx->pool = pool; + return 0; +} + +size_t ZSTD_CCtx_refPrefix(ZSTD_CCtx* cctx, const void* prefix, size_t prefixSize) +{ + return ZSTD_CCtx_refPrefix_advanced(cctx, prefix, prefixSize, ZSTD_dct_rawContent); +} + +size_t ZSTD_CCtx_refPrefix_advanced( + ZSTD_CCtx* cctx, const void* prefix, size_t prefixSize, ZSTD_dictContentType_e dictContentType) +{ + RETURN_ERROR_IF(cctx->streamStage != zcss_init, stage_wrong, + "Can't ref a prefix when ctx not in init stage."); + ZSTD_clearAllDicts(cctx); + if (prefix != NULL && prefixSize > 0) { + cctx->prefixDict.dict = prefix; + cctx->prefixDict.dictSize = prefixSize; + cctx->prefixDict.dictContentType = dictContentType; + } + return 0; +} + +/*! ZSTD_CCtx_reset() : + * Also dumps dictionary */ +size_t ZSTD_CCtx_reset(ZSTD_CCtx* cctx, ZSTD_ResetDirective reset) +{ + if ( (reset == ZSTD_reset_session_only) + || (reset == ZSTD_reset_session_and_parameters) ) { + cctx->streamStage = zcss_init; + cctx->pledgedSrcSizePlusOne = 0; + } + if ( (reset == ZSTD_reset_parameters) + || (reset == ZSTD_reset_session_and_parameters) ) { + RETURN_ERROR_IF(cctx->streamStage != zcss_init, stage_wrong, + "Can't reset parameters only when not in init stage."); + ZSTD_clearAllDicts(cctx); + return ZSTD_CCtxParams_reset(&cctx->requestedParams); + } + return 0; +} + + +/** ZSTD_checkCParams() : + control CParam values remain within authorized range. + @return : 0, or an error code if one value is beyond authorized range */ +size_t ZSTD_checkCParams(ZSTD_compressionParameters cParams) +{ + BOUNDCHECK(ZSTD_c_windowLog, (int)cParams.windowLog); + BOUNDCHECK(ZSTD_c_chainLog, (int)cParams.chainLog); + BOUNDCHECK(ZSTD_c_hashLog, (int)cParams.hashLog); + BOUNDCHECK(ZSTD_c_searchLog, (int)cParams.searchLog); + BOUNDCHECK(ZSTD_c_minMatch, (int)cParams.minMatch); + BOUNDCHECK(ZSTD_c_targetLength,(int)cParams.targetLength); + BOUNDCHECK(ZSTD_c_strategy, cParams.strategy); + return 0; +} + +/** ZSTD_clampCParams() : + * make CParam values within valid range. + * @return : valid CParams */ +static ZSTD_compressionParameters +ZSTD_clampCParams(ZSTD_compressionParameters cParams) +{ +# define CLAMP_TYPE(cParam, val, type) { \ + ZSTD_bounds const bounds = ZSTD_cParam_getBounds(cParam); \ + if ((int)valbounds.upperBound) val=(type)bounds.upperBound; \ + } +# define CLAMP(cParam, val) CLAMP_TYPE(cParam, val, unsigned) + CLAMP(ZSTD_c_windowLog, cParams.windowLog); + CLAMP(ZSTD_c_chainLog, cParams.chainLog); + CLAMP(ZSTD_c_hashLog, cParams.hashLog); + CLAMP(ZSTD_c_searchLog, cParams.searchLog); + CLAMP(ZSTD_c_minMatch, cParams.minMatch); + CLAMP(ZSTD_c_targetLength,cParams.targetLength); + CLAMP_TYPE(ZSTD_c_strategy,cParams.strategy, ZSTD_strategy); + return cParams; +} + +/** ZSTD_cycleLog() : + * condition for correct operation : hashLog > 1 */ +U32 ZSTD_cycleLog(U32 hashLog, ZSTD_strategy strat) +{ + U32 const btScale = ((U32)strat >= (U32)ZSTD_btlazy2); + return hashLog - btScale; +} + +/** ZSTD_dictAndWindowLog() : + * Returns an adjusted window log that is large enough to fit the source and the dictionary. + * The zstd format says that the entire dictionary is valid if one byte of the dictionary + * is within the window. So the hashLog and chainLog should be large enough to reference both + * the dictionary and the window. So we must use this adjusted dictAndWindowLog when downsizing + * the hashLog and windowLog. + * NOTE: srcSize must not be ZSTD_CONTENTSIZE_UNKNOWN. + */ +static U32 ZSTD_dictAndWindowLog(U32 windowLog, U64 srcSize, U64 dictSize) +{ + const U64 maxWindowSize = 1ULL << ZSTD_WINDOWLOG_MAX; + /* No dictionary ==> No change */ + if (dictSize == 0) { + return windowLog; + } + assert(windowLog <= ZSTD_WINDOWLOG_MAX); + assert(srcSize != ZSTD_CONTENTSIZE_UNKNOWN); /* Handled in ZSTD_adjustCParams_internal() */ + { + U64 const windowSize = 1ULL << windowLog; + U64 const dictAndWindowSize = dictSize + windowSize; + /* If the window size is already large enough to fit both the source and the dictionary + * then just use the window size. Otherwise adjust so that it fits the dictionary and + * the window. + */ + if (windowSize >= dictSize + srcSize) { + return windowLog; /* Window size large enough already */ + } else if (dictAndWindowSize >= maxWindowSize) { + return ZSTD_WINDOWLOG_MAX; /* Larger than max window log */ + } else { + return ZSTD_highbit32((U32)dictAndWindowSize - 1) + 1; + } + } +} + +/** ZSTD_adjustCParams_internal() : + * optimize `cPar` for a specified input (`srcSize` and `dictSize`). + * mostly downsize to reduce memory consumption and initialization latency. + * `srcSize` can be ZSTD_CONTENTSIZE_UNKNOWN when not known. + * `mode` is the mode for parameter adjustment. See docs for `ZSTD_cParamMode_e`. + * note : `srcSize==0` means 0! + * condition : cPar is presumed validated (can be checked using ZSTD_checkCParams()). */ +static ZSTD_compressionParameters +ZSTD_adjustCParams_internal(ZSTD_compressionParameters cPar, + unsigned long long srcSize, + size_t dictSize, + ZSTD_cParamMode_e mode) +{ + const U64 minSrcSize = 513; /* (1<<9) + 1 */ + const U64 maxWindowResize = 1ULL << (ZSTD_WINDOWLOG_MAX-1); + assert(ZSTD_checkCParams(cPar)==0); + + switch (mode) { + case ZSTD_cpm_unknown: + case ZSTD_cpm_noAttachDict: + /* If we don't know the source size, don't make any + * assumptions about it. We will already have selected + * smaller parameters if a dictionary is in use. + */ + break; + case ZSTD_cpm_createCDict: + /* Assume a small source size when creating a dictionary + * with an unkown source size. + */ + if (dictSize && srcSize == ZSTD_CONTENTSIZE_UNKNOWN) + srcSize = minSrcSize; + break; + case ZSTD_cpm_attachDict: + /* Dictionary has its own dedicated parameters which have + * already been selected. We are selecting parameters + * for only the source. + */ + dictSize = 0; + break; + default: + assert(0); + break; + } + + /* resize windowLog if input is small enough, to use less memory */ + if ( (srcSize < maxWindowResize) + && (dictSize < maxWindowResize) ) { + U32 const tSize = (U32)(srcSize + dictSize); + static U32 const hashSizeMin = 1 << ZSTD_HASHLOG_MIN; + U32 const srcLog = (tSize < hashSizeMin) ? ZSTD_HASHLOG_MIN : + ZSTD_highbit32(tSize-1) + 1; + if (cPar.windowLog > srcLog) cPar.windowLog = srcLog; + } + if (srcSize != ZSTD_CONTENTSIZE_UNKNOWN) { + U32 const dictAndWindowLog = ZSTD_dictAndWindowLog(cPar.windowLog, (U64)srcSize, (U64)dictSize); + U32 const cycleLog = ZSTD_cycleLog(cPar.chainLog, cPar.strategy); + if (cPar.hashLog > dictAndWindowLog+1) cPar.hashLog = dictAndWindowLog+1; + if (cycleLog > dictAndWindowLog) + cPar.chainLog -= (cycleLog - dictAndWindowLog); + } + + if (cPar.windowLog < ZSTD_WINDOWLOG_ABSOLUTEMIN) + cPar.windowLog = ZSTD_WINDOWLOG_ABSOLUTEMIN; /* minimum wlog required for valid frame header */ + + return cPar; +} + +ZSTD_compressionParameters +ZSTD_adjustCParams(ZSTD_compressionParameters cPar, + unsigned long long srcSize, + size_t dictSize) +{ + cPar = ZSTD_clampCParams(cPar); /* resulting cPar is necessarily valid (all parameters within range) */ + if (srcSize == 0) srcSize = ZSTD_CONTENTSIZE_UNKNOWN; + return ZSTD_adjustCParams_internal(cPar, srcSize, dictSize, ZSTD_cpm_unknown); +} + +static ZSTD_compressionParameters ZSTD_getCParams_internal(int compressionLevel, unsigned long long srcSizeHint, size_t dictSize, ZSTD_cParamMode_e mode); +static ZSTD_parameters ZSTD_getParams_internal(int compressionLevel, unsigned long long srcSizeHint, size_t dictSize, ZSTD_cParamMode_e mode); + +static void ZSTD_overrideCParams( + ZSTD_compressionParameters* cParams, + const ZSTD_compressionParameters* overrides) +{ + if (overrides->windowLog) cParams->windowLog = overrides->windowLog; + if (overrides->hashLog) cParams->hashLog = overrides->hashLog; + if (overrides->chainLog) cParams->chainLog = overrides->chainLog; + if (overrides->searchLog) cParams->searchLog = overrides->searchLog; + if (overrides->minMatch) cParams->minMatch = overrides->minMatch; + if (overrides->targetLength) cParams->targetLength = overrides->targetLength; + if (overrides->strategy) cParams->strategy = overrides->strategy; +} + +ZSTD_compressionParameters ZSTD_getCParamsFromCCtxParams( + const ZSTD_CCtx_params* CCtxParams, U64 srcSizeHint, size_t dictSize, ZSTD_cParamMode_e mode) +{ + ZSTD_compressionParameters cParams; + if (srcSizeHint == ZSTD_CONTENTSIZE_UNKNOWN && CCtxParams->srcSizeHint > 0) { + srcSizeHint = CCtxParams->srcSizeHint; + } + cParams = ZSTD_getCParams_internal(CCtxParams->compressionLevel, srcSizeHint, dictSize, mode); + if (CCtxParams->ldmParams.enableLdm) cParams.windowLog = ZSTD_LDM_DEFAULT_WINDOW_LOG; + ZSTD_overrideCParams(&cParams, &CCtxParams->cParams); + assert(!ZSTD_checkCParams(cParams)); + /* srcSizeHint == 0 means 0 */ + return ZSTD_adjustCParams_internal(cParams, srcSizeHint, dictSize, mode); +} + +static size_t +ZSTD_sizeof_matchState(const ZSTD_compressionParameters* const cParams, + const ZSTD_useRowMatchFinderMode_e useRowMatchFinder, + const U32 enableDedicatedDictSearch, + const U32 forCCtx) +{ + /* chain table size should be 0 for fast or row-hash strategies */ + size_t const chainSize = ZSTD_allocateChainTable(cParams->strategy, useRowMatchFinder, enableDedicatedDictSearch && !forCCtx) + ? ((size_t)1 << cParams->chainLog) + : 0; + size_t const hSize = ((size_t)1) << cParams->hashLog; + U32 const hashLog3 = (forCCtx && cParams->minMatch==3) ? MIN(ZSTD_HASHLOG3_MAX, cParams->windowLog) : 0; + size_t const h3Size = hashLog3 ? ((size_t)1) << hashLog3 : 0; + /* We don't use ZSTD_cwksp_alloc_size() here because the tables aren't + * surrounded by redzones in ASAN. */ + size_t const tableSpace = chainSize * sizeof(U32) + + hSize * sizeof(U32) + + h3Size * sizeof(U32); + size_t const optPotentialSpace = + ZSTD_cwksp_aligned_alloc_size((MaxML+1) * sizeof(U32)) + + ZSTD_cwksp_aligned_alloc_size((MaxLL+1) * sizeof(U32)) + + ZSTD_cwksp_aligned_alloc_size((MaxOff+1) * sizeof(U32)) + + ZSTD_cwksp_aligned_alloc_size((1<strategy, useRowMatchFinder) + ? ZSTD_cwksp_aligned_alloc_size(hSize*sizeof(U16)) + : 0; + size_t const optSpace = (forCCtx && (cParams->strategy >= ZSTD_btopt)) + ? optPotentialSpace + : 0; + size_t const slackSpace = ZSTD_cwksp_slack_space_required(); + + /* tables are guaranteed to be sized in multiples of 64 bytes (or 16 uint32_t) */ + ZSTD_STATIC_ASSERT(ZSTD_HASHLOG_MIN >= 4 && ZSTD_WINDOWLOG_MIN >= 4 && ZSTD_CHAINLOG_MIN >= 4); + assert(useRowMatchFinder != ZSTD_urm_auto); + + DEBUGLOG(4, "chainSize: %u - hSize: %u - h3Size: %u", + (U32)chainSize, (U32)hSize, (U32)h3Size); + return tableSpace + optSpace + slackSpace + lazyAdditionalSpace; +} + +static size_t ZSTD_estimateCCtxSize_usingCCtxParams_internal( + const ZSTD_compressionParameters* cParams, + const ldmParams_t* ldmParams, + const int isStatic, + const ZSTD_useRowMatchFinderMode_e useRowMatchFinder, + const size_t buffInSize, + const size_t buffOutSize, + const U64 pledgedSrcSize) +{ + size_t const windowSize = MAX(1, (size_t)MIN(((U64)1 << cParams->windowLog), pledgedSrcSize)); + size_t const blockSize = MIN(ZSTD_BLOCKSIZE_MAX, windowSize); + U32 const divider = (cParams->minMatch==3) ? 3 : 4; + size_t const maxNbSeq = blockSize / divider; + size_t const tokenSpace = ZSTD_cwksp_alloc_size(WILDCOPY_OVERLENGTH + blockSize) + + ZSTD_cwksp_aligned_alloc_size(maxNbSeq * sizeof(seqDef)) + + 3 * ZSTD_cwksp_alloc_size(maxNbSeq * sizeof(BYTE)); + size_t const entropySpace = ZSTD_cwksp_alloc_size(ENTROPY_WORKSPACE_SIZE); + size_t const blockStateSpace = 2 * ZSTD_cwksp_alloc_size(sizeof(ZSTD_compressedBlockState_t)); + size_t const matchStateSize = ZSTD_sizeof_matchState(cParams, useRowMatchFinder, /* enableDedicatedDictSearch */ 0, /* forCCtx */ 1); + + size_t const ldmSpace = ZSTD_ldm_getTableSize(*ldmParams); + size_t const maxNbLdmSeq = ZSTD_ldm_getMaxNbSeq(*ldmParams, blockSize); + size_t const ldmSeqSpace = ldmParams->enableLdm ? + ZSTD_cwksp_aligned_alloc_size(maxNbLdmSeq * sizeof(rawSeq)) : 0; + + + size_t const bufferSpace = ZSTD_cwksp_alloc_size(buffInSize) + + ZSTD_cwksp_alloc_size(buffOutSize); + + size_t const cctxSpace = isStatic ? ZSTD_cwksp_alloc_size(sizeof(ZSTD_CCtx)) : 0; + + size_t const neededSpace = + cctxSpace + + entropySpace + + blockStateSpace + + ldmSpace + + ldmSeqSpace + + matchStateSize + + tokenSpace + + bufferSpace; + + DEBUGLOG(5, "estimate workspace : %u", (U32)neededSpace); + return neededSpace; +} + +size_t ZSTD_estimateCCtxSize_usingCCtxParams(const ZSTD_CCtx_params* params) +{ + ZSTD_compressionParameters const cParams = + ZSTD_getCParamsFromCCtxParams(params, ZSTD_CONTENTSIZE_UNKNOWN, 0, ZSTD_cpm_noAttachDict); + ZSTD_useRowMatchFinderMode_e const useRowMatchFinder = ZSTD_resolveRowMatchFinderMode(params->useRowMatchFinder, + &cParams); + + RETURN_ERROR_IF(params->nbWorkers > 0, GENERIC, "Estimate CCtx size is supported for single-threaded compression only."); + /* estimateCCtxSize is for one-shot compression. So no buffers should + * be needed. However, we still allocate two 0-sized buffers, which can + * take space under ASAN. */ + return ZSTD_estimateCCtxSize_usingCCtxParams_internal( + &cParams, ¶ms->ldmParams, 1, useRowMatchFinder, 0, 0, ZSTD_CONTENTSIZE_UNKNOWN); +} + +size_t ZSTD_estimateCCtxSize_usingCParams(ZSTD_compressionParameters cParams) +{ + ZSTD_CCtx_params initialParams = ZSTD_makeCCtxParamsFromCParams(cParams); + if (ZSTD_rowMatchFinderSupported(cParams.strategy)) { + /* Pick bigger of not using and using row-based matchfinder for greedy and lazy strategies */ + size_t noRowCCtxSize; + size_t rowCCtxSize; + initialParams.useRowMatchFinder = ZSTD_urm_disableRowMatchFinder; + noRowCCtxSize = ZSTD_estimateCCtxSize_usingCCtxParams(&initialParams); + initialParams.useRowMatchFinder = ZSTD_urm_enableRowMatchFinder; + rowCCtxSize = ZSTD_estimateCCtxSize_usingCCtxParams(&initialParams); + return MAX(noRowCCtxSize, rowCCtxSize); + } else { + return ZSTD_estimateCCtxSize_usingCCtxParams(&initialParams); + } +} + +static size_t ZSTD_estimateCCtxSize_internal(int compressionLevel) +{ + int tier = 0; + size_t largestSize = 0; + static const unsigned long long srcSizeTiers[4] = {16 KB, 128 KB, 256 KB, ZSTD_CONTENTSIZE_UNKNOWN}; + for (; tier < 4; ++tier) { + /* Choose the set of cParams for a given level across all srcSizes that give the largest cctxSize */ + ZSTD_compressionParameters const cParams = ZSTD_getCParams_internal(compressionLevel, srcSizeTiers[tier], 0, ZSTD_cpm_noAttachDict); + largestSize = MAX(ZSTD_estimateCCtxSize_usingCParams(cParams), largestSize); + } + return largestSize; +} + +size_t ZSTD_estimateCCtxSize(int compressionLevel) +{ + int level; + size_t memBudget = 0; + for (level=MIN(compressionLevel, 1); level<=compressionLevel; level++) { + /* Ensure monotonically increasing memory usage as compression level increases */ + size_t const newMB = ZSTD_estimateCCtxSize_internal(level); + if (newMB > memBudget) memBudget = newMB; + } + return memBudget; +} + +size_t ZSTD_estimateCStreamSize_usingCCtxParams(const ZSTD_CCtx_params* params) +{ + RETURN_ERROR_IF(params->nbWorkers > 0, GENERIC, "Estimate CCtx size is supported for single-threaded compression only."); + { ZSTD_compressionParameters const cParams = + ZSTD_getCParamsFromCCtxParams(params, ZSTD_CONTENTSIZE_UNKNOWN, 0, ZSTD_cpm_noAttachDict); + size_t const blockSize = MIN(ZSTD_BLOCKSIZE_MAX, (size_t)1 << cParams.windowLog); + size_t const inBuffSize = (params->inBufferMode == ZSTD_bm_buffered) + ? ((size_t)1 << cParams.windowLog) + blockSize + : 0; + size_t const outBuffSize = (params->outBufferMode == ZSTD_bm_buffered) + ? ZSTD_compressBound(blockSize) + 1 + : 0; + ZSTD_useRowMatchFinderMode_e const useRowMatchFinder = ZSTD_resolveRowMatchFinderMode(params->useRowMatchFinder, ¶ms->cParams); + + return ZSTD_estimateCCtxSize_usingCCtxParams_internal( + &cParams, ¶ms->ldmParams, 1, useRowMatchFinder, inBuffSize, outBuffSize, + ZSTD_CONTENTSIZE_UNKNOWN); + } +} + +size_t ZSTD_estimateCStreamSize_usingCParams(ZSTD_compressionParameters cParams) +{ + ZSTD_CCtx_params initialParams = ZSTD_makeCCtxParamsFromCParams(cParams); + if (ZSTD_rowMatchFinderSupported(cParams.strategy)) { + /* Pick bigger of not using and using row-based matchfinder for greedy and lazy strategies */ + size_t noRowCCtxSize; + size_t rowCCtxSize; + initialParams.useRowMatchFinder = ZSTD_urm_disableRowMatchFinder; + noRowCCtxSize = ZSTD_estimateCStreamSize_usingCCtxParams(&initialParams); + initialParams.useRowMatchFinder = ZSTD_urm_enableRowMatchFinder; + rowCCtxSize = ZSTD_estimateCStreamSize_usingCCtxParams(&initialParams); + return MAX(noRowCCtxSize, rowCCtxSize); + } else { + return ZSTD_estimateCStreamSize_usingCCtxParams(&initialParams); + } +} + +static size_t ZSTD_estimateCStreamSize_internal(int compressionLevel) +{ + ZSTD_compressionParameters const cParams = ZSTD_getCParams_internal(compressionLevel, ZSTD_CONTENTSIZE_UNKNOWN, 0, ZSTD_cpm_noAttachDict); + return ZSTD_estimateCStreamSize_usingCParams(cParams); +} + +size_t ZSTD_estimateCStreamSize(int compressionLevel) +{ + int level; + size_t memBudget = 0; + for (level=MIN(compressionLevel, 1); level<=compressionLevel; level++) { + size_t const newMB = ZSTD_estimateCStreamSize_internal(level); + if (newMB > memBudget) memBudget = newMB; + } + return memBudget; +} + +/* ZSTD_getFrameProgression(): + * tells how much data has been consumed (input) and produced (output) for current frame. + * able to count progression inside worker threads (non-blocking mode). + */ +ZSTD_frameProgression ZSTD_getFrameProgression(const ZSTD_CCtx* cctx) +{ +#ifdef ZSTD_MULTITHREAD + if (cctx->appliedParams.nbWorkers > 0) { + return ZSTDMT_getFrameProgression(cctx->mtctx); + } +#endif + { ZSTD_frameProgression fp; + size_t const buffered = (cctx->inBuff == NULL) ? 0 : + cctx->inBuffPos - cctx->inToCompress; + if (buffered) assert(cctx->inBuffPos >= cctx->inToCompress); + assert(buffered <= ZSTD_BLOCKSIZE_MAX); + fp.ingested = cctx->consumedSrcSize + buffered; + fp.consumed = cctx->consumedSrcSize; + fp.produced = cctx->producedCSize; + fp.flushed = cctx->producedCSize; /* simplified; some data might still be left within streaming output buffer */ + fp.currentJobID = 0; + fp.nbActiveWorkers = 0; + return fp; +} } + +/*! ZSTD_toFlushNow() + * Only useful for multithreading scenarios currently (nbWorkers >= 1). + */ +size_t ZSTD_toFlushNow(ZSTD_CCtx* cctx) +{ +#ifdef ZSTD_MULTITHREAD + if (cctx->appliedParams.nbWorkers > 0) { + return ZSTDMT_toFlushNow(cctx->mtctx); + } +#endif + (void)cctx; + return 0; /* over-simplification; could also check if context is currently running in streaming mode, and in which case, report how many bytes are left to be flushed within output buffer */ +} + +static void ZSTD_assertEqualCParams(ZSTD_compressionParameters cParams1, + ZSTD_compressionParameters cParams2) +{ + (void)cParams1; + (void)cParams2; + assert(cParams1.windowLog == cParams2.windowLog); + assert(cParams1.chainLog == cParams2.chainLog); + assert(cParams1.hashLog == cParams2.hashLog); + assert(cParams1.searchLog == cParams2.searchLog); + assert(cParams1.minMatch == cParams2.minMatch); + assert(cParams1.targetLength == cParams2.targetLength); + assert(cParams1.strategy == cParams2.strategy); +} + +void ZSTD_reset_compressedBlockState(ZSTD_compressedBlockState_t* bs) +{ + int i; + for (i = 0; i < ZSTD_REP_NUM; ++i) + bs->rep[i] = repStartValue[i]; + bs->entropy.huf.repeatMode = HUF_repeat_none; + bs->entropy.fse.offcode_repeatMode = FSE_repeat_none; + bs->entropy.fse.matchlength_repeatMode = FSE_repeat_none; + bs->entropy.fse.litlength_repeatMode = FSE_repeat_none; +} + +/*! ZSTD_invalidateMatchState() + * Invalidate all the matches in the match finder tables. + * Requires nextSrc and base to be set (can be NULL). + */ +static void ZSTD_invalidateMatchState(ZSTD_matchState_t* ms) +{ + ZSTD_window_clear(&ms->window); + + ms->nextToUpdate = ms->window.dictLimit; + ms->loadedDictEnd = 0; + ms->opt.litLengthSum = 0; /* force reset of btopt stats */ + ms->dictMatchState = NULL; +} + +/** + * Controls, for this matchState reset, whether the tables need to be cleared / + * prepared for the coming compression (ZSTDcrp_makeClean), or whether the + * tables can be left unclean (ZSTDcrp_leaveDirty), because we know that a + * subsequent operation will overwrite the table space anyways (e.g., copying + * the matchState contents in from a CDict). + */ +typedef enum { + ZSTDcrp_makeClean, + ZSTDcrp_leaveDirty +} ZSTD_compResetPolicy_e; + +/** + * Controls, for this matchState reset, whether indexing can continue where it + * left off (ZSTDirp_continue), or whether it needs to be restarted from zero + * (ZSTDirp_reset). + */ +typedef enum { + ZSTDirp_continue, + ZSTDirp_reset +} ZSTD_indexResetPolicy_e; + +typedef enum { + ZSTD_resetTarget_CDict, + ZSTD_resetTarget_CCtx +} ZSTD_resetTarget_e; + + +static size_t +ZSTD_reset_matchState(ZSTD_matchState_t* ms, + ZSTD_cwksp* ws, + const ZSTD_compressionParameters* cParams, + const ZSTD_useRowMatchFinderMode_e useRowMatchFinder, + const ZSTD_compResetPolicy_e crp, + const ZSTD_indexResetPolicy_e forceResetIndex, + const ZSTD_resetTarget_e forWho) +{ + /* disable chain table allocation for fast or row-based strategies */ + size_t const chainSize = ZSTD_allocateChainTable(cParams->strategy, useRowMatchFinder, + ms->dedicatedDictSearch && (forWho == ZSTD_resetTarget_CDict)) + ? ((size_t)1 << cParams->chainLog) + : 0; + size_t const hSize = ((size_t)1) << cParams->hashLog; + U32 const hashLog3 = ((forWho == ZSTD_resetTarget_CCtx) && cParams->minMatch==3) ? MIN(ZSTD_HASHLOG3_MAX, cParams->windowLog) : 0; + size_t const h3Size = hashLog3 ? ((size_t)1) << hashLog3 : 0; + + DEBUGLOG(4, "reset indices : %u", forceResetIndex == ZSTDirp_reset); + assert(useRowMatchFinder != ZSTD_urm_auto); + if (forceResetIndex == ZSTDirp_reset) { + ZSTD_window_init(&ms->window); + ZSTD_cwksp_mark_tables_dirty(ws); + } + + ms->hashLog3 = hashLog3; + + ZSTD_invalidateMatchState(ms); + + assert(!ZSTD_cwksp_reserve_failed(ws)); /* check that allocation hasn't already failed */ + + ZSTD_cwksp_clear_tables(ws); + + DEBUGLOG(5, "reserving table space"); + /* table Space */ + ms->hashTable = (U32*)ZSTD_cwksp_reserve_table(ws, hSize * sizeof(U32)); + ms->chainTable = (U32*)ZSTD_cwksp_reserve_table(ws, chainSize * sizeof(U32)); + ms->hashTable3 = (U32*)ZSTD_cwksp_reserve_table(ws, h3Size * sizeof(U32)); + RETURN_ERROR_IF(ZSTD_cwksp_reserve_failed(ws), memory_allocation, + "failed a workspace allocation in ZSTD_reset_matchState"); + + DEBUGLOG(4, "reset table : %u", crp!=ZSTDcrp_leaveDirty); + if (crp!=ZSTDcrp_leaveDirty) { + /* reset tables only */ + ZSTD_cwksp_clean_tables(ws); + } + + /* opt parser space */ + if ((forWho == ZSTD_resetTarget_CCtx) && (cParams->strategy >= ZSTD_btopt)) { + DEBUGLOG(4, "reserving optimal parser space"); + ms->opt.litFreq = (unsigned*)ZSTD_cwksp_reserve_aligned(ws, (1<opt.litLengthFreq = (unsigned*)ZSTD_cwksp_reserve_aligned(ws, (MaxLL+1) * sizeof(unsigned)); + ms->opt.matchLengthFreq = (unsigned*)ZSTD_cwksp_reserve_aligned(ws, (MaxML+1) * sizeof(unsigned)); + ms->opt.offCodeFreq = (unsigned*)ZSTD_cwksp_reserve_aligned(ws, (MaxOff+1) * sizeof(unsigned)); + ms->opt.matchTable = (ZSTD_match_t*)ZSTD_cwksp_reserve_aligned(ws, (ZSTD_OPT_NUM+1) * sizeof(ZSTD_match_t)); + ms->opt.priceTable = (ZSTD_optimal_t*)ZSTD_cwksp_reserve_aligned(ws, (ZSTD_OPT_NUM+1) * sizeof(ZSTD_optimal_t)); + } + + if (ZSTD_rowMatchFinderUsed(cParams->strategy, useRowMatchFinder)) { + { /* Row match finder needs an additional table of hashes ("tags") */ + size_t const tagTableSize = hSize*sizeof(U16); + ms->tagTable = (U16*)ZSTD_cwksp_reserve_aligned(ws, tagTableSize); + if (ms->tagTable) ZSTD_memset(ms->tagTable, 0, tagTableSize); + } + { /* Switch to 32-entry rows if searchLog is 5 (or more) */ + U32 const rowLog = cParams->searchLog < 5 ? 4 : 5; + assert(cParams->hashLog > rowLog); + ms->rowHashLog = cParams->hashLog - rowLog; + } + } + + ms->cParams = *cParams; + + RETURN_ERROR_IF(ZSTD_cwksp_reserve_failed(ws), memory_allocation, + "failed a workspace allocation in ZSTD_reset_matchState"); + return 0; +} + +/* ZSTD_indexTooCloseToMax() : + * minor optimization : prefer memset() rather than reduceIndex() + * which is measurably slow in some circumstances (reported for Visual Studio). + * Works when re-using a context for a lot of smallish inputs : + * if all inputs are smaller than ZSTD_INDEXOVERFLOW_MARGIN, + * memset() will be triggered before reduceIndex(). + */ +#define ZSTD_INDEXOVERFLOW_MARGIN (16 MB) +static int ZSTD_indexTooCloseToMax(ZSTD_window_t w) +{ + return (size_t)(w.nextSrc - w.base) > (ZSTD_CURRENT_MAX - ZSTD_INDEXOVERFLOW_MARGIN); +} + +/** ZSTD_dictTooBig(): + * When dictionaries are larger than ZSTD_CHUNKSIZE_MAX they can't be loaded in + * one go generically. So we ensure that in that case we reset the tables to zero, + * so that we can load as much of the dictionary as possible. + */ +static int ZSTD_dictTooBig(size_t const loadedDictSize) +{ + return loadedDictSize > ZSTD_CHUNKSIZE_MAX; +} + +/*! ZSTD_resetCCtx_internal() : + * @param loadedDictSize The size of the dictionary to be loaded + * into the context, if any. If no dictionary is used, or the + * dictionary is being attached / copied, then pass 0. + * note : `params` are assumed fully validated at this stage. + */ +static size_t ZSTD_resetCCtx_internal(ZSTD_CCtx* zc, + ZSTD_CCtx_params const* params, + U64 const pledgedSrcSize, + size_t const loadedDictSize, + ZSTD_compResetPolicy_e const crp, + ZSTD_buffered_policy_e const zbuff) +{ + ZSTD_cwksp* const ws = &zc->workspace; + DEBUGLOG(4, "ZSTD_resetCCtx_internal: pledgedSrcSize=%u, wlog=%u, useRowMatchFinder=%d", + (U32)pledgedSrcSize, params->cParams.windowLog, (int)params->useRowMatchFinder); + assert(!ZSTD_isError(ZSTD_checkCParams(params->cParams))); + + zc->isFirstBlock = 1; + + /* Set applied params early so we can modify them for LDM, + * and point params at the applied params. + */ + zc->appliedParams = *params; + params = &zc->appliedParams; + + assert(params->useRowMatchFinder != ZSTD_urm_auto); + if (params->ldmParams.enableLdm) { + /* Adjust long distance matching parameters */ + ZSTD_ldm_adjustParameters(&zc->appliedParams.ldmParams, ¶ms->cParams); + assert(params->ldmParams.hashLog >= params->ldmParams.bucketSizeLog); + assert(params->ldmParams.hashRateLog < 32); + } + + { size_t const windowSize = MAX(1, (size_t)MIN(((U64)1 << params->cParams.windowLog), pledgedSrcSize)); + size_t const blockSize = MIN(ZSTD_BLOCKSIZE_MAX, windowSize); + U32 const divider = (params->cParams.minMatch==3) ? 3 : 4; + size_t const maxNbSeq = blockSize / divider; + size_t const buffOutSize = (zbuff == ZSTDb_buffered && params->outBufferMode == ZSTD_bm_buffered) + ? ZSTD_compressBound(blockSize) + 1 + : 0; + size_t const buffInSize = (zbuff == ZSTDb_buffered && params->inBufferMode == ZSTD_bm_buffered) + ? windowSize + blockSize + : 0; + size_t const maxNbLdmSeq = ZSTD_ldm_getMaxNbSeq(params->ldmParams, blockSize); + + int const indexTooClose = ZSTD_indexTooCloseToMax(zc->blockState.matchState.window); + int const dictTooBig = ZSTD_dictTooBig(loadedDictSize); + ZSTD_indexResetPolicy_e needsIndexReset = + (indexTooClose || dictTooBig || !zc->initialized) ? ZSTDirp_reset : ZSTDirp_continue; + + size_t const neededSpace = + ZSTD_estimateCCtxSize_usingCCtxParams_internal( + ¶ms->cParams, ¶ms->ldmParams, zc->staticSize != 0, params->useRowMatchFinder, + buffInSize, buffOutSize, pledgedSrcSize); + int resizeWorkspace; + + FORWARD_IF_ERROR(neededSpace, "cctx size estimate failed!"); + + if (!zc->staticSize) ZSTD_cwksp_bump_oversized_duration(ws, 0); + + { /* Check if workspace is large enough, alloc a new one if needed */ + int const workspaceTooSmall = ZSTD_cwksp_sizeof(ws) < neededSpace; + int const workspaceWasteful = ZSTD_cwksp_check_wasteful(ws, neededSpace); + resizeWorkspace = workspaceTooSmall || workspaceWasteful; + DEBUGLOG(4, "Need %zu B workspace", neededSpace); + DEBUGLOG(4, "windowSize: %zu - blockSize: %zu", windowSize, blockSize); + + if (resizeWorkspace) { + DEBUGLOG(4, "Resize workspaceSize from %zuKB to %zuKB", + ZSTD_cwksp_sizeof(ws) >> 10, + neededSpace >> 10); + + RETURN_ERROR_IF(zc->staticSize, memory_allocation, "static cctx : no resize"); + + needsIndexReset = ZSTDirp_reset; + + ZSTD_cwksp_free(ws, zc->customMem); + FORWARD_IF_ERROR(ZSTD_cwksp_create(ws, neededSpace, zc->customMem), ""); + + DEBUGLOG(5, "reserving object space"); + /* Statically sized space. + * entropyWorkspace never moves, + * though prev/next block swap places */ + assert(ZSTD_cwksp_check_available(ws, 2 * sizeof(ZSTD_compressedBlockState_t))); + zc->blockState.prevCBlock = (ZSTD_compressedBlockState_t*) ZSTD_cwksp_reserve_object(ws, sizeof(ZSTD_compressedBlockState_t)); + RETURN_ERROR_IF(zc->blockState.prevCBlock == NULL, memory_allocation, "couldn't allocate prevCBlock"); + zc->blockState.nextCBlock = (ZSTD_compressedBlockState_t*) ZSTD_cwksp_reserve_object(ws, sizeof(ZSTD_compressedBlockState_t)); + RETURN_ERROR_IF(zc->blockState.nextCBlock == NULL, memory_allocation, "couldn't allocate nextCBlock"); + zc->entropyWorkspace = (U32*) ZSTD_cwksp_reserve_object(ws, ENTROPY_WORKSPACE_SIZE); + RETURN_ERROR_IF(zc->blockState.nextCBlock == NULL, memory_allocation, "couldn't allocate entropyWorkspace"); + } } + + ZSTD_cwksp_clear(ws); + + /* init params */ + zc->blockState.matchState.cParams = params->cParams; + zc->pledgedSrcSizePlusOne = pledgedSrcSize+1; + zc->consumedSrcSize = 0; + zc->producedCSize = 0; + if (pledgedSrcSize == ZSTD_CONTENTSIZE_UNKNOWN) + zc->appliedParams.fParams.contentSizeFlag = 0; + DEBUGLOG(4, "pledged content size : %u ; flag : %u", + (unsigned)pledgedSrcSize, zc->appliedParams.fParams.contentSizeFlag); + zc->blockSize = blockSize; + + XXH64_reset(&zc->xxhState, 0); + zc->stage = ZSTDcs_init; + zc->dictID = 0; + zc->dictContentSize = 0; + + ZSTD_reset_compressedBlockState(zc->blockState.prevCBlock); + + /* ZSTD_wildcopy() is used to copy into the literals buffer, + * so we have to oversize the buffer by WILDCOPY_OVERLENGTH bytes. + */ + zc->seqStore.litStart = ZSTD_cwksp_reserve_buffer(ws, blockSize + WILDCOPY_OVERLENGTH); + zc->seqStore.maxNbLit = blockSize; + + /* buffers */ + zc->bufferedPolicy = zbuff; + zc->inBuffSize = buffInSize; + zc->inBuff = (char*)ZSTD_cwksp_reserve_buffer(ws, buffInSize); + zc->outBuffSize = buffOutSize; + zc->outBuff = (char*)ZSTD_cwksp_reserve_buffer(ws, buffOutSize); + + /* ldm bucketOffsets table */ + if (params->ldmParams.enableLdm) { + /* TODO: avoid memset? */ + size_t const numBuckets = + ((size_t)1) << (params->ldmParams.hashLog - + params->ldmParams.bucketSizeLog); + zc->ldmState.bucketOffsets = ZSTD_cwksp_reserve_buffer(ws, numBuckets); + ZSTD_memset(zc->ldmState.bucketOffsets, 0, numBuckets); + } + + /* sequences storage */ + ZSTD_referenceExternalSequences(zc, NULL, 0); + zc->seqStore.maxNbSeq = maxNbSeq; + zc->seqStore.llCode = ZSTD_cwksp_reserve_buffer(ws, maxNbSeq * sizeof(BYTE)); + zc->seqStore.mlCode = ZSTD_cwksp_reserve_buffer(ws, maxNbSeq * sizeof(BYTE)); + zc->seqStore.ofCode = ZSTD_cwksp_reserve_buffer(ws, maxNbSeq * sizeof(BYTE)); + zc->seqStore.sequencesStart = (seqDef*)ZSTD_cwksp_reserve_aligned(ws, maxNbSeq * sizeof(seqDef)); + + FORWARD_IF_ERROR(ZSTD_reset_matchState( + &zc->blockState.matchState, + ws, + ¶ms->cParams, + params->useRowMatchFinder, + crp, + needsIndexReset, + ZSTD_resetTarget_CCtx), ""); + + /* ldm hash table */ + if (params->ldmParams.enableLdm) { + /* TODO: avoid memset? */ + size_t const ldmHSize = ((size_t)1) << params->ldmParams.hashLog; + zc->ldmState.hashTable = (ldmEntry_t*)ZSTD_cwksp_reserve_aligned(ws, ldmHSize * sizeof(ldmEntry_t)); + ZSTD_memset(zc->ldmState.hashTable, 0, ldmHSize * sizeof(ldmEntry_t)); + zc->ldmSequences = (rawSeq*)ZSTD_cwksp_reserve_aligned(ws, maxNbLdmSeq * sizeof(rawSeq)); + zc->maxNbLdmSequences = maxNbLdmSeq; + + ZSTD_window_init(&zc->ldmState.window); + zc->ldmState.loadedDictEnd = 0; + } + + assert(ZSTD_cwksp_estimated_space_within_bounds(ws, neededSpace, resizeWorkspace)); + DEBUGLOG(3, "wksp: finished allocating, %zd bytes remain available", ZSTD_cwksp_available_space(ws)); + + zc->initialized = 1; + + return 0; + } +} + +/* ZSTD_invalidateRepCodes() : + * ensures next compression will not use repcodes from previous block. + * Note : only works with regular variant; + * do not use with extDict variant ! */ +void ZSTD_invalidateRepCodes(ZSTD_CCtx* cctx) { + int i; + for (i=0; iblockState.prevCBlock->rep[i] = 0; + assert(!ZSTD_window_hasExtDict(cctx->blockState.matchState.window)); +} + +/* These are the approximate sizes for each strategy past which copying the + * dictionary tables into the working context is faster than using them + * in-place. + */ +static const size_t attachDictSizeCutoffs[ZSTD_STRATEGY_MAX+1] = { + 8 KB, /* unused */ + 8 KB, /* ZSTD_fast */ + 16 KB, /* ZSTD_dfast */ + 32 KB, /* ZSTD_greedy */ + 32 KB, /* ZSTD_lazy */ + 32 KB, /* ZSTD_lazy2 */ + 32 KB, /* ZSTD_btlazy2 */ + 32 KB, /* ZSTD_btopt */ + 8 KB, /* ZSTD_btultra */ + 8 KB /* ZSTD_btultra2 */ +}; + +static int ZSTD_shouldAttachDict(const ZSTD_CDict* cdict, + const ZSTD_CCtx_params* params, + U64 pledgedSrcSize) +{ + size_t cutoff = attachDictSizeCutoffs[cdict->matchState.cParams.strategy]; + int const dedicatedDictSearch = cdict->matchState.dedicatedDictSearch; + return dedicatedDictSearch + || ( ( pledgedSrcSize <= cutoff + || pledgedSrcSize == ZSTD_CONTENTSIZE_UNKNOWN + || params->attachDictPref == ZSTD_dictForceAttach ) + && params->attachDictPref != ZSTD_dictForceCopy + && !params->forceWindow ); /* dictMatchState isn't correctly + * handled in _enforceMaxDist */ +} + +static size_t +ZSTD_resetCCtx_byAttachingCDict(ZSTD_CCtx* cctx, + const ZSTD_CDict* cdict, + ZSTD_CCtx_params params, + U64 pledgedSrcSize, + ZSTD_buffered_policy_e zbuff) +{ + DEBUGLOG(4, "ZSTD_resetCCtx_byAttachingCDict() pledgedSrcSize=%llu", + (unsigned long long)pledgedSrcSize); + { + ZSTD_compressionParameters adjusted_cdict_cParams = cdict->matchState.cParams; + unsigned const windowLog = params.cParams.windowLog; + assert(windowLog != 0); + /* Resize working context table params for input only, since the dict + * has its own tables. */ + /* pledgedSrcSize == 0 means 0! */ + + if (cdict->matchState.dedicatedDictSearch) { + ZSTD_dedicatedDictSearch_revertCParams(&adjusted_cdict_cParams); + } + + params.cParams = ZSTD_adjustCParams_internal(adjusted_cdict_cParams, pledgedSrcSize, + cdict->dictContentSize, ZSTD_cpm_attachDict); + params.cParams.windowLog = windowLog; + params.useRowMatchFinder = cdict->useRowMatchFinder; /* cdict overrides */ + FORWARD_IF_ERROR(ZSTD_resetCCtx_internal(cctx, ¶ms, pledgedSrcSize, + /* loadedDictSize */ 0, + ZSTDcrp_makeClean, zbuff), ""); + assert(cctx->appliedParams.cParams.strategy == adjusted_cdict_cParams.strategy); + } + + { const U32 cdictEnd = (U32)( cdict->matchState.window.nextSrc + - cdict->matchState.window.base); + const U32 cdictLen = cdictEnd - cdict->matchState.window.dictLimit; + if (cdictLen == 0) { + /* don't even attach dictionaries with no contents */ + DEBUGLOG(4, "skipping attaching empty dictionary"); + } else { + DEBUGLOG(4, "attaching dictionary into context"); + cctx->blockState.matchState.dictMatchState = &cdict->matchState; + + /* prep working match state so dict matches never have negative indices + * when they are translated to the working context's index space. */ + if (cctx->blockState.matchState.window.dictLimit < cdictEnd) { + cctx->blockState.matchState.window.nextSrc = + cctx->blockState.matchState.window.base + cdictEnd; + ZSTD_window_clear(&cctx->blockState.matchState.window); + } + /* loadedDictEnd is expressed within the referential of the active context */ + cctx->blockState.matchState.loadedDictEnd = cctx->blockState.matchState.window.dictLimit; + } } + + cctx->dictID = cdict->dictID; + cctx->dictContentSize = cdict->dictContentSize; + + /* copy block state */ + ZSTD_memcpy(cctx->blockState.prevCBlock, &cdict->cBlockState, sizeof(cdict->cBlockState)); + + return 0; +} + +static size_t ZSTD_resetCCtx_byCopyingCDict(ZSTD_CCtx* cctx, + const ZSTD_CDict* cdict, + ZSTD_CCtx_params params, + U64 pledgedSrcSize, + ZSTD_buffered_policy_e zbuff) +{ + const ZSTD_compressionParameters *cdict_cParams = &cdict->matchState.cParams; + + assert(!cdict->matchState.dedicatedDictSearch); + DEBUGLOG(4, "ZSTD_resetCCtx_byCopyingCDict() pledgedSrcSize=%llu", + (unsigned long long)pledgedSrcSize); + + { unsigned const windowLog = params.cParams.windowLog; + assert(windowLog != 0); + /* Copy only compression parameters related to tables. */ + params.cParams = *cdict_cParams; + params.cParams.windowLog = windowLog; + params.useRowMatchFinder = cdict->useRowMatchFinder; + FORWARD_IF_ERROR(ZSTD_resetCCtx_internal(cctx, ¶ms, pledgedSrcSize, + /* loadedDictSize */ 0, + ZSTDcrp_leaveDirty, zbuff), ""); + assert(cctx->appliedParams.cParams.strategy == cdict_cParams->strategy); + assert(cctx->appliedParams.cParams.hashLog == cdict_cParams->hashLog); + assert(cctx->appliedParams.cParams.chainLog == cdict_cParams->chainLog); + } + + ZSTD_cwksp_mark_tables_dirty(&cctx->workspace); + assert(params.useRowMatchFinder != ZSTD_urm_auto); + + /* copy tables */ + { size_t const chainSize = ZSTD_allocateChainTable(cdict_cParams->strategy, cdict->useRowMatchFinder, 0 /* DDS guaranteed disabled */) + ? ((size_t)1 << cdict_cParams->chainLog) + : 0; + size_t const hSize = (size_t)1 << cdict_cParams->hashLog; + + ZSTD_memcpy(cctx->blockState.matchState.hashTable, + cdict->matchState.hashTable, + hSize * sizeof(U32)); + /* Do not copy cdict's chainTable if cctx has parameters such that it would not use chainTable */ + if (ZSTD_allocateChainTable(cctx->appliedParams.cParams.strategy, cctx->appliedParams.useRowMatchFinder, 0 /* forDDSDict */)) { + ZSTD_memcpy(cctx->blockState.matchState.chainTable, + cdict->matchState.chainTable, + chainSize * sizeof(U32)); + } + /* copy tag table */ + if (ZSTD_rowMatchFinderUsed(cdict_cParams->strategy, cdict->useRowMatchFinder)) { + size_t const tagTableSize = hSize*sizeof(U16); + ZSTD_memcpy(cctx->blockState.matchState.tagTable, + cdict->matchState.tagTable, + tagTableSize); + } + } + + /* Zero the hashTable3, since the cdict never fills it */ + { int const h3log = cctx->blockState.matchState.hashLog3; + size_t const h3Size = h3log ? ((size_t)1 << h3log) : 0; + assert(cdict->matchState.hashLog3 == 0); + ZSTD_memset(cctx->blockState.matchState.hashTable3, 0, h3Size * sizeof(U32)); + } + + ZSTD_cwksp_mark_tables_clean(&cctx->workspace); + + /* copy dictionary offsets */ + { ZSTD_matchState_t const* srcMatchState = &cdict->matchState; + ZSTD_matchState_t* dstMatchState = &cctx->blockState.matchState; + dstMatchState->window = srcMatchState->window; + dstMatchState->nextToUpdate = srcMatchState->nextToUpdate; + dstMatchState->loadedDictEnd= srcMatchState->loadedDictEnd; + } + + cctx->dictID = cdict->dictID; + cctx->dictContentSize = cdict->dictContentSize; + + /* copy block state */ + ZSTD_memcpy(cctx->blockState.prevCBlock, &cdict->cBlockState, sizeof(cdict->cBlockState)); + + return 0; +} + +/* We have a choice between copying the dictionary context into the working + * context, or referencing the dictionary context from the working context + * in-place. We decide here which strategy to use. */ +static size_t ZSTD_resetCCtx_usingCDict(ZSTD_CCtx* cctx, + const ZSTD_CDict* cdict, + const ZSTD_CCtx_params* params, + U64 pledgedSrcSize, + ZSTD_buffered_policy_e zbuff) +{ + + DEBUGLOG(4, "ZSTD_resetCCtx_usingCDict (pledgedSrcSize=%u)", + (unsigned)pledgedSrcSize); + + if (ZSTD_shouldAttachDict(cdict, params, pledgedSrcSize)) { + return ZSTD_resetCCtx_byAttachingCDict( + cctx, cdict, *params, pledgedSrcSize, zbuff); + } else { + return ZSTD_resetCCtx_byCopyingCDict( + cctx, cdict, *params, pledgedSrcSize, zbuff); + } +} + +/*! ZSTD_copyCCtx_internal() : + * Duplicate an existing context `srcCCtx` into another one `dstCCtx`. + * Only works during stage ZSTDcs_init (i.e. after creation, but before first call to ZSTD_compressContinue()). + * The "context", in this case, refers to the hash and chain tables, + * entropy tables, and dictionary references. + * `windowLog` value is enforced if != 0, otherwise value is copied from srcCCtx. + * @return : 0, or an error code */ +static size_t ZSTD_copyCCtx_internal(ZSTD_CCtx* dstCCtx, + const ZSTD_CCtx* srcCCtx, + ZSTD_frameParameters fParams, + U64 pledgedSrcSize, + ZSTD_buffered_policy_e zbuff) +{ + RETURN_ERROR_IF(srcCCtx->stage!=ZSTDcs_init, stage_wrong, + "Can't copy a ctx that's not in init stage."); + DEBUGLOG(5, "ZSTD_copyCCtx_internal"); + ZSTD_memcpy(&dstCCtx->customMem, &srcCCtx->customMem, sizeof(ZSTD_customMem)); + { ZSTD_CCtx_params params = dstCCtx->requestedParams; + /* Copy only compression parameters related to tables. */ + params.cParams = srcCCtx->appliedParams.cParams; + assert(srcCCtx->appliedParams.useRowMatchFinder != ZSTD_urm_auto); + params.useRowMatchFinder = srcCCtx->appliedParams.useRowMatchFinder; + params.fParams = fParams; + ZSTD_resetCCtx_internal(dstCCtx, ¶ms, pledgedSrcSize, + /* loadedDictSize */ 0, + ZSTDcrp_leaveDirty, zbuff); + assert(dstCCtx->appliedParams.cParams.windowLog == srcCCtx->appliedParams.cParams.windowLog); + assert(dstCCtx->appliedParams.cParams.strategy == srcCCtx->appliedParams.cParams.strategy); + assert(dstCCtx->appliedParams.cParams.hashLog == srcCCtx->appliedParams.cParams.hashLog); + assert(dstCCtx->appliedParams.cParams.chainLog == srcCCtx->appliedParams.cParams.chainLog); + assert(dstCCtx->blockState.matchState.hashLog3 == srcCCtx->blockState.matchState.hashLog3); + } + + ZSTD_cwksp_mark_tables_dirty(&dstCCtx->workspace); + + /* copy tables */ + { size_t const chainSize = ZSTD_allocateChainTable(srcCCtx->appliedParams.cParams.strategy, + srcCCtx->appliedParams.useRowMatchFinder, + 0 /* forDDSDict */) + ? ((size_t)1 << srcCCtx->appliedParams.cParams.chainLog) + : 0; + size_t const hSize = (size_t)1 << srcCCtx->appliedParams.cParams.hashLog; + int const h3log = srcCCtx->blockState.matchState.hashLog3; + size_t const h3Size = h3log ? ((size_t)1 << h3log) : 0; + + ZSTD_memcpy(dstCCtx->blockState.matchState.hashTable, + srcCCtx->blockState.matchState.hashTable, + hSize * sizeof(U32)); + ZSTD_memcpy(dstCCtx->blockState.matchState.chainTable, + srcCCtx->blockState.matchState.chainTable, + chainSize * sizeof(U32)); + ZSTD_memcpy(dstCCtx->blockState.matchState.hashTable3, + srcCCtx->blockState.matchState.hashTable3, + h3Size * sizeof(U32)); + } + + ZSTD_cwksp_mark_tables_clean(&dstCCtx->workspace); + + /* copy dictionary offsets */ + { + const ZSTD_matchState_t* srcMatchState = &srcCCtx->blockState.matchState; + ZSTD_matchState_t* dstMatchState = &dstCCtx->blockState.matchState; + dstMatchState->window = srcMatchState->window; + dstMatchState->nextToUpdate = srcMatchState->nextToUpdate; + dstMatchState->loadedDictEnd= srcMatchState->loadedDictEnd; + } + dstCCtx->dictID = srcCCtx->dictID; + dstCCtx->dictContentSize = srcCCtx->dictContentSize; + + /* copy block state */ + ZSTD_memcpy(dstCCtx->blockState.prevCBlock, srcCCtx->blockState.prevCBlock, sizeof(*srcCCtx->blockState.prevCBlock)); + + return 0; +} + +/*! ZSTD_copyCCtx() : + * Duplicate an existing context `srcCCtx` into another one `dstCCtx`. + * Only works during stage ZSTDcs_init (i.e. after creation, but before first call to ZSTD_compressContinue()). + * pledgedSrcSize==0 means "unknown". +* @return : 0, or an error code */ +size_t ZSTD_copyCCtx(ZSTD_CCtx* dstCCtx, const ZSTD_CCtx* srcCCtx, unsigned long long pledgedSrcSize) +{ + ZSTD_frameParameters fParams = { 1 /*content*/, 0 /*checksum*/, 0 /*noDictID*/ }; + ZSTD_buffered_policy_e const zbuff = srcCCtx->bufferedPolicy; + ZSTD_STATIC_ASSERT((U32)ZSTDb_buffered==1); + if (pledgedSrcSize==0) pledgedSrcSize = ZSTD_CONTENTSIZE_UNKNOWN; + fParams.contentSizeFlag = (pledgedSrcSize != ZSTD_CONTENTSIZE_UNKNOWN); + + return ZSTD_copyCCtx_internal(dstCCtx, srcCCtx, + fParams, pledgedSrcSize, + zbuff); +} + + +#define ZSTD_ROWSIZE 16 +/*! ZSTD_reduceTable() : + * reduce table indexes by `reducerValue`, or squash to zero. + * PreserveMark preserves "unsorted mark" for btlazy2 strategy. + * It must be set to a clear 0/1 value, to remove branch during inlining. + * Presume table size is a multiple of ZSTD_ROWSIZE + * to help auto-vectorization */ +FORCE_INLINE_TEMPLATE void +ZSTD_reduceTable_internal (U32* const table, U32 const size, U32 const reducerValue, int const preserveMark) +{ + int const nbRows = (int)size / ZSTD_ROWSIZE; + int cellNb = 0; + int rowNb; + assert((size & (ZSTD_ROWSIZE-1)) == 0); /* multiple of ZSTD_ROWSIZE */ + assert(size < (1U<<31)); /* can be casted to int */ + +#if ZSTD_MEMORY_SANITIZER && !defined (ZSTD_MSAN_DONT_POISON_WORKSPACE) + /* To validate that the table re-use logic is sound, and that we don't + * access table space that we haven't cleaned, we re-"poison" the table + * space every time we mark it dirty. + * + * This function however is intended to operate on those dirty tables and + * re-clean them. So when this function is used correctly, we can unpoison + * the memory it operated on. This introduces a blind spot though, since + * if we now try to operate on __actually__ poisoned memory, we will not + * detect that. */ + __msan_unpoison(table, size * sizeof(U32)); +#endif + + for (rowNb=0 ; rowNb < nbRows ; rowNb++) { + int column; + for (column=0; columncParams.hashLog; + ZSTD_reduceTable(ms->hashTable, hSize, reducerValue); + } + + if (ZSTD_allocateChainTable(params->cParams.strategy, params->useRowMatchFinder, (U32)ms->dedicatedDictSearch)) { + U32 const chainSize = (U32)1 << params->cParams.chainLog; + if (params->cParams.strategy == ZSTD_btlazy2) + ZSTD_reduceTable_btlazy2(ms->chainTable, chainSize, reducerValue); + else + ZSTD_reduceTable(ms->chainTable, chainSize, reducerValue); + } + + if (ms->hashLog3) { + U32 const h3Size = (U32)1 << ms->hashLog3; + ZSTD_reduceTable(ms->hashTable3, h3Size, reducerValue); + } +} + + +/*-******************************************************* +* Block entropic compression +*********************************************************/ + +/* See doc/zstd_compression_format.md for detailed format description */ + +void ZSTD_seqToCodes(const seqStore_t* seqStorePtr) +{ + const seqDef* const sequences = seqStorePtr->sequencesStart; + BYTE* const llCodeTable = seqStorePtr->llCode; + BYTE* const ofCodeTable = seqStorePtr->ofCode; + BYTE* const mlCodeTable = seqStorePtr->mlCode; + U32 const nbSeq = (U32)(seqStorePtr->sequences - seqStorePtr->sequencesStart); + U32 u; + assert(nbSeq <= seqStorePtr->maxNbSeq); + for (u=0; ulongLengthType==ZSTD_llt_literalLength) + llCodeTable[seqStorePtr->longLengthPos] = MaxLL; + if (seqStorePtr->longLengthType==ZSTD_llt_matchLength) + mlCodeTable[seqStorePtr->longLengthPos] = MaxML; +} + +/* ZSTD_useTargetCBlockSize(): + * Returns if target compressed block size param is being used. + * If used, compression will do best effort to make a compressed block size to be around targetCBlockSize. + * Returns 1 if true, 0 otherwise. */ +static int ZSTD_useTargetCBlockSize(const ZSTD_CCtx_params* cctxParams) +{ + DEBUGLOG(5, "ZSTD_useTargetCBlockSize (targetCBlockSize=%zu)", cctxParams->targetCBlockSize); + return (cctxParams->targetCBlockSize != 0); +} + +/* ZSTD_blockSplitterEnabled(): + * Returns if block splitting param is being used + * If used, compression will do best effort to split a block in order to improve compression ratio. + * Returns 1 if true, 0 otherwise. */ +static int ZSTD_blockSplitterEnabled(ZSTD_CCtx_params* cctxParams) +{ + DEBUGLOG(5, "ZSTD_blockSplitterEnabled(splitBlocks=%d)", cctxParams->splitBlocks); + return (cctxParams->splitBlocks != 0); +} + +/* Type returned by ZSTD_buildSequencesStatistics containing finalized symbol encoding types + * and size of the sequences statistics + */ +typedef struct { + U32 LLtype; + U32 Offtype; + U32 MLtype; + size_t size; + size_t lastCountSize; /* Accounts for bug in 1.3.4. More detail in ZSTD_entropyCompressSeqStore_internal() */ +} ZSTD_symbolEncodingTypeStats_t; + +/* ZSTD_buildSequencesStatistics(): + * Returns a ZSTD_symbolEncodingTypeStats_t, or a zstd error code in the `size` field. + * Modifies `nextEntropy` to have the appropriate values as a side effect. + * nbSeq must be greater than 0. + * + * entropyWkspSize must be of size at least ENTROPY_WORKSPACE_SIZE - (MaxSeq + 1)*sizeof(U32) + */ +static ZSTD_symbolEncodingTypeStats_t +ZSTD_buildSequencesStatistics(seqStore_t* seqStorePtr, size_t nbSeq, + const ZSTD_fseCTables_t* prevEntropy, ZSTD_fseCTables_t* nextEntropy, + BYTE* dst, const BYTE* const dstEnd, + ZSTD_strategy strategy, unsigned* countWorkspace, + void* entropyWorkspace, size_t entropyWkspSize) { + BYTE* const ostart = dst; + const BYTE* const oend = dstEnd; + BYTE* op = ostart; + FSE_CTable* CTable_LitLength = nextEntropy->litlengthCTable; + FSE_CTable* CTable_OffsetBits = nextEntropy->offcodeCTable; + FSE_CTable* CTable_MatchLength = nextEntropy->matchlengthCTable; + const BYTE* const ofCodeTable = seqStorePtr->ofCode; + const BYTE* const llCodeTable = seqStorePtr->llCode; + const BYTE* const mlCodeTable = seqStorePtr->mlCode; + ZSTD_symbolEncodingTypeStats_t stats; + + stats.lastCountSize = 0; + /* convert length/distances into codes */ + ZSTD_seqToCodes(seqStorePtr); + assert(op <= oend); + assert(nbSeq != 0); /* ZSTD_selectEncodingType() divides by nbSeq */ + /* build CTable for Literal Lengths */ + { unsigned max = MaxLL; + size_t const mostFrequent = HIST_countFast_wksp(countWorkspace, &max, llCodeTable, nbSeq, entropyWorkspace, entropyWkspSize); /* can't fail */ + DEBUGLOG(5, "Building LL table"); + nextEntropy->litlength_repeatMode = prevEntropy->litlength_repeatMode; + stats.LLtype = ZSTD_selectEncodingType(&nextEntropy->litlength_repeatMode, + countWorkspace, max, mostFrequent, nbSeq, + LLFSELog, prevEntropy->litlengthCTable, + LL_defaultNorm, LL_defaultNormLog, + ZSTD_defaultAllowed, strategy); + assert(set_basic < set_compressed && set_rle < set_compressed); + assert(!(stats.LLtype < set_compressed && nextEntropy->litlength_repeatMode != FSE_repeat_none)); /* We don't copy tables */ + { size_t const countSize = ZSTD_buildCTable( + op, (size_t)(oend - op), + CTable_LitLength, LLFSELog, (symbolEncodingType_e)stats.LLtype, + countWorkspace, max, llCodeTable, nbSeq, + LL_defaultNorm, LL_defaultNormLog, MaxLL, + prevEntropy->litlengthCTable, + sizeof(prevEntropy->litlengthCTable), + entropyWorkspace, entropyWkspSize); + if (ZSTD_isError(countSize)) { + DEBUGLOG(3, "ZSTD_buildCTable for LitLens failed"); + stats.size = countSize; + return stats; + } + if (stats.LLtype == set_compressed) + stats.lastCountSize = countSize; + op += countSize; + assert(op <= oend); + } } + /* build CTable for Offsets */ + { unsigned max = MaxOff; + size_t const mostFrequent = HIST_countFast_wksp( + countWorkspace, &max, ofCodeTable, nbSeq, entropyWorkspace, entropyWkspSize); /* can't fail */ + /* We can only use the basic table if max <= DefaultMaxOff, otherwise the offsets are too large */ + ZSTD_defaultPolicy_e const defaultPolicy = (max <= DefaultMaxOff) ? ZSTD_defaultAllowed : ZSTD_defaultDisallowed; + DEBUGLOG(5, "Building OF table"); + nextEntropy->offcode_repeatMode = prevEntropy->offcode_repeatMode; + stats.Offtype = ZSTD_selectEncodingType(&nextEntropy->offcode_repeatMode, + countWorkspace, max, mostFrequent, nbSeq, + OffFSELog, prevEntropy->offcodeCTable, + OF_defaultNorm, OF_defaultNormLog, + defaultPolicy, strategy); + assert(!(stats.Offtype < set_compressed && nextEntropy->offcode_repeatMode != FSE_repeat_none)); /* We don't copy tables */ + { size_t const countSize = ZSTD_buildCTable( + op, (size_t)(oend - op), + CTable_OffsetBits, OffFSELog, (symbolEncodingType_e)stats.Offtype, + countWorkspace, max, ofCodeTable, nbSeq, + OF_defaultNorm, OF_defaultNormLog, DefaultMaxOff, + prevEntropy->offcodeCTable, + sizeof(prevEntropy->offcodeCTable), + entropyWorkspace, entropyWkspSize); + if (ZSTD_isError(countSize)) { + DEBUGLOG(3, "ZSTD_buildCTable for Offsets failed"); + stats.size = countSize; + return stats; + } + if (stats.Offtype == set_compressed) + stats.lastCountSize = countSize; + op += countSize; + assert(op <= oend); + } } + /* build CTable for MatchLengths */ + { unsigned max = MaxML; + size_t const mostFrequent = HIST_countFast_wksp( + countWorkspace, &max, mlCodeTable, nbSeq, entropyWorkspace, entropyWkspSize); /* can't fail */ + DEBUGLOG(5, "Building ML table (remaining space : %i)", (int)(oend-op)); + nextEntropy->matchlength_repeatMode = prevEntropy->matchlength_repeatMode; + stats.MLtype = ZSTD_selectEncodingType(&nextEntropy->matchlength_repeatMode, + countWorkspace, max, mostFrequent, nbSeq, + MLFSELog, prevEntropy->matchlengthCTable, + ML_defaultNorm, ML_defaultNormLog, + ZSTD_defaultAllowed, strategy); + assert(!(stats.MLtype < set_compressed && nextEntropy->matchlength_repeatMode != FSE_repeat_none)); /* We don't copy tables */ + { size_t const countSize = ZSTD_buildCTable( + op, (size_t)(oend - op), + CTable_MatchLength, MLFSELog, (symbolEncodingType_e)stats.MLtype, + countWorkspace, max, mlCodeTable, nbSeq, + ML_defaultNorm, ML_defaultNormLog, MaxML, + prevEntropy->matchlengthCTable, + sizeof(prevEntropy->matchlengthCTable), + entropyWorkspace, entropyWkspSize); + if (ZSTD_isError(countSize)) { + DEBUGLOG(3, "ZSTD_buildCTable for MatchLengths failed"); + stats.size = countSize; + return stats; + } + if (stats.MLtype == set_compressed) + stats.lastCountSize = countSize; + op += countSize; + assert(op <= oend); + } } + stats.size = (size_t)(op-ostart); + return stats; +} + +/* ZSTD_entropyCompressSeqStore_internal(): + * compresses both literals and sequences + * Returns compressed size of block, or a zstd error. + */ +MEM_STATIC size_t +ZSTD_entropyCompressSeqStore_internal(seqStore_t* seqStorePtr, + const ZSTD_entropyCTables_t* prevEntropy, + ZSTD_entropyCTables_t* nextEntropy, + const ZSTD_CCtx_params* cctxParams, + void* dst, size_t dstCapacity, + void* entropyWorkspace, size_t entropyWkspSize, + const int bmi2) +{ + const int longOffsets = cctxParams->cParams.windowLog > STREAM_ACCUMULATOR_MIN; + ZSTD_strategy const strategy = cctxParams->cParams.strategy; + unsigned* count = (unsigned*)entropyWorkspace; + FSE_CTable* CTable_LitLength = nextEntropy->fse.litlengthCTable; + FSE_CTable* CTable_OffsetBits = nextEntropy->fse.offcodeCTable; + FSE_CTable* CTable_MatchLength = nextEntropy->fse.matchlengthCTable; + const seqDef* const sequences = seqStorePtr->sequencesStart; + const size_t nbSeq = seqStorePtr->sequences - seqStorePtr->sequencesStart; + const BYTE* const ofCodeTable = seqStorePtr->ofCode; + const BYTE* const llCodeTable = seqStorePtr->llCode; + const BYTE* const mlCodeTable = seqStorePtr->mlCode; + BYTE* const ostart = (BYTE*)dst; + BYTE* const oend = ostart + dstCapacity; + BYTE* op = ostart; + size_t lastCountSize; + + entropyWorkspace = count + (MaxSeq + 1); + entropyWkspSize -= (MaxSeq + 1) * sizeof(*count); + + DEBUGLOG(4, "ZSTD_entropyCompressSeqStore_internal (nbSeq=%zu)", nbSeq); + ZSTD_STATIC_ASSERT(HUF_WORKSPACE_SIZE >= (1<= HUF_WORKSPACE_SIZE); + + /* Compress literals */ + { const BYTE* const literals = seqStorePtr->litStart; + size_t const litSize = (size_t)(seqStorePtr->lit - literals); + size_t const cSize = ZSTD_compressLiterals( + &prevEntropy->huf, &nextEntropy->huf, + cctxParams->cParams.strategy, + ZSTD_disableLiteralsCompression(cctxParams), + op, dstCapacity, + literals, litSize, + entropyWorkspace, entropyWkspSize, + bmi2); + FORWARD_IF_ERROR(cSize, "ZSTD_compressLiterals failed"); + assert(cSize <= dstCapacity); + op += cSize; + } + + /* Sequences Header */ + RETURN_ERROR_IF((oend-op) < 3 /*max nbSeq Size*/ + 1 /*seqHead*/, + dstSize_tooSmall, "Can't fit seq hdr in output buf!"); + if (nbSeq < 128) { + *op++ = (BYTE)nbSeq; + } else if (nbSeq < LONGNBSEQ) { + op[0] = (BYTE)((nbSeq>>8) + 0x80); + op[1] = (BYTE)nbSeq; + op+=2; + } else { + op[0]=0xFF; + MEM_writeLE16(op+1, (U16)(nbSeq - LONGNBSEQ)); + op+=3; + } + assert(op <= oend); + if (nbSeq==0) { + /* Copy the old tables over as if we repeated them */ + ZSTD_memcpy(&nextEntropy->fse, &prevEntropy->fse, sizeof(prevEntropy->fse)); + return (size_t)(op - ostart); + } + { + ZSTD_symbolEncodingTypeStats_t stats; + BYTE* seqHead = op++; + /* build stats for sequences */ + stats = ZSTD_buildSequencesStatistics(seqStorePtr, nbSeq, + &prevEntropy->fse, &nextEntropy->fse, + op, oend, + strategy, count, + entropyWorkspace, entropyWkspSize); + FORWARD_IF_ERROR(stats.size, "ZSTD_buildSequencesStatistics failed!"); + *seqHead = (BYTE)((stats.LLtype<<6) + (stats.Offtype<<4) + (stats.MLtype<<2)); + lastCountSize = stats.lastCountSize; + op += stats.size; + } + + { size_t const bitstreamSize = ZSTD_encodeSequences( + op, (size_t)(oend - op), + CTable_MatchLength, mlCodeTable, + CTable_OffsetBits, ofCodeTable, + CTable_LitLength, llCodeTable, + sequences, nbSeq, + longOffsets, bmi2); + FORWARD_IF_ERROR(bitstreamSize, "ZSTD_encodeSequences failed"); + op += bitstreamSize; + assert(op <= oend); + /* zstd versions <= 1.3.4 mistakenly report corruption when + * FSE_readNCount() receives a buffer < 4 bytes. + * Fixed by https://github.com/facebook/zstd/pull/1146. + * This can happen when the last set_compressed table present is 2 + * bytes and the bitstream is only one byte. + * In this exceedingly rare case, we will simply emit an uncompressed + * block, since it isn't worth optimizing. + */ + if (lastCountSize && (lastCountSize + bitstreamSize) < 4) { + /* lastCountSize >= 2 && bitstreamSize > 0 ==> lastCountSize == 3 */ + assert(lastCountSize + bitstreamSize == 3); + DEBUGLOG(5, "Avoiding bug in zstd decoder in versions <= 1.3.4 by " + "emitting an uncompressed block."); + return 0; + } + } + + DEBUGLOG(5, "compressed block size : %u", (unsigned)(op - ostart)); + return (size_t)(op - ostart); +} + +MEM_STATIC size_t +ZSTD_entropyCompressSeqStore(seqStore_t* seqStorePtr, + const ZSTD_entropyCTables_t* prevEntropy, + ZSTD_entropyCTables_t* nextEntropy, + const ZSTD_CCtx_params* cctxParams, + void* dst, size_t dstCapacity, + size_t srcSize, + void* entropyWorkspace, size_t entropyWkspSize, + int bmi2) +{ + size_t const cSize = ZSTD_entropyCompressSeqStore_internal( + seqStorePtr, prevEntropy, nextEntropy, cctxParams, + dst, dstCapacity, + entropyWorkspace, entropyWkspSize, bmi2); + if (cSize == 0) return 0; + /* When srcSize <= dstCapacity, there is enough space to write a raw uncompressed block. + * Since we ran out of space, block must be not compressible, so fall back to raw uncompressed block. + */ + if ((cSize == ERROR(dstSize_tooSmall)) & (srcSize <= dstCapacity)) + return 0; /* block not compressed */ + FORWARD_IF_ERROR(cSize, "ZSTD_entropyCompressSeqStore_internal failed"); + + /* Check compressibility */ + { size_t const maxCSize = srcSize - ZSTD_minGain(srcSize, cctxParams->cParams.strategy); + if (cSize >= maxCSize) return 0; /* block not compressed */ + } + DEBUGLOG(4, "ZSTD_entropyCompressSeqStore() cSize: %zu", cSize); + return cSize; +} + +/* ZSTD_selectBlockCompressor() : + * Not static, but internal use only (used by long distance matcher) + * assumption : strat is a valid strategy */ +ZSTD_blockCompressor ZSTD_selectBlockCompressor(ZSTD_strategy strat, ZSTD_useRowMatchFinderMode_e useRowMatchFinder, ZSTD_dictMode_e dictMode) +{ + static const ZSTD_blockCompressor blockCompressor[4][ZSTD_STRATEGY_MAX+1] = { + { ZSTD_compressBlock_fast /* default for 0 */, + ZSTD_compressBlock_fast, + ZSTD_compressBlock_doubleFast, + ZSTD_compressBlock_greedy, + ZSTD_compressBlock_lazy, + ZSTD_compressBlock_lazy2, + ZSTD_compressBlock_btlazy2, + ZSTD_compressBlock_btopt, + ZSTD_compressBlock_btultra, + ZSTD_compressBlock_btultra2 }, + { ZSTD_compressBlock_fast_extDict /* default for 0 */, + ZSTD_compressBlock_fast_extDict, + ZSTD_compressBlock_doubleFast_extDict, + ZSTD_compressBlock_greedy_extDict, + ZSTD_compressBlock_lazy_extDict, + ZSTD_compressBlock_lazy2_extDict, + ZSTD_compressBlock_btlazy2_extDict, + ZSTD_compressBlock_btopt_extDict, + ZSTD_compressBlock_btultra_extDict, + ZSTD_compressBlock_btultra_extDict }, + { ZSTD_compressBlock_fast_dictMatchState /* default for 0 */, + ZSTD_compressBlock_fast_dictMatchState, + ZSTD_compressBlock_doubleFast_dictMatchState, + ZSTD_compressBlock_greedy_dictMatchState, + ZSTD_compressBlock_lazy_dictMatchState, + ZSTD_compressBlock_lazy2_dictMatchState, + ZSTD_compressBlock_btlazy2_dictMatchState, + ZSTD_compressBlock_btopt_dictMatchState, + ZSTD_compressBlock_btultra_dictMatchState, + ZSTD_compressBlock_btultra_dictMatchState }, + { NULL /* default for 0 */, + NULL, + NULL, + ZSTD_compressBlock_greedy_dedicatedDictSearch, + ZSTD_compressBlock_lazy_dedicatedDictSearch, + ZSTD_compressBlock_lazy2_dedicatedDictSearch, + NULL, + NULL, + NULL, + NULL } + }; + ZSTD_blockCompressor selectedCompressor; + ZSTD_STATIC_ASSERT((unsigned)ZSTD_fast == 1); + + assert(ZSTD_cParam_withinBounds(ZSTD_c_strategy, strat)); + DEBUGLOG(4, "Selected block compressor: dictMode=%d strat=%d rowMatchfinder=%d", (int)dictMode, (int)strat, (int)useRowMatchFinder); + if (ZSTD_rowMatchFinderUsed(strat, useRowMatchFinder)) { + static const ZSTD_blockCompressor rowBasedBlockCompressors[4][3] = { + { ZSTD_compressBlock_greedy_row, + ZSTD_compressBlock_lazy_row, + ZSTD_compressBlock_lazy2_row }, + { ZSTD_compressBlock_greedy_extDict_row, + ZSTD_compressBlock_lazy_extDict_row, + ZSTD_compressBlock_lazy2_extDict_row }, + { ZSTD_compressBlock_greedy_dictMatchState_row, + ZSTD_compressBlock_lazy_dictMatchState_row, + ZSTD_compressBlock_lazy2_dictMatchState_row }, + { ZSTD_compressBlock_greedy_dedicatedDictSearch_row, + ZSTD_compressBlock_lazy_dedicatedDictSearch_row, + ZSTD_compressBlock_lazy2_dedicatedDictSearch_row } + }; + DEBUGLOG(4, "Selecting a row-based matchfinder"); + assert(useRowMatchFinder != ZSTD_urm_auto); + selectedCompressor = rowBasedBlockCompressors[(int)dictMode][(int)strat - (int)ZSTD_greedy]; + } else { + selectedCompressor = blockCompressor[(int)dictMode][(int)strat]; + } + assert(selectedCompressor != NULL); + return selectedCompressor; +} + +static void ZSTD_storeLastLiterals(seqStore_t* seqStorePtr, + const BYTE* anchor, size_t lastLLSize) +{ + ZSTD_memcpy(seqStorePtr->lit, anchor, lastLLSize); + seqStorePtr->lit += lastLLSize; +} + +void ZSTD_resetSeqStore(seqStore_t* ssPtr) +{ + ssPtr->lit = ssPtr->litStart; + ssPtr->sequences = ssPtr->sequencesStart; + ssPtr->longLengthType = ZSTD_llt_none; +} + +typedef enum { ZSTDbss_compress, ZSTDbss_noCompress } ZSTD_buildSeqStore_e; + +static size_t ZSTD_buildSeqStore(ZSTD_CCtx* zc, const void* src, size_t srcSize) +{ + ZSTD_matchState_t* const ms = &zc->blockState.matchState; + DEBUGLOG(5, "ZSTD_buildSeqStore (srcSize=%zu)", srcSize); + assert(srcSize <= ZSTD_BLOCKSIZE_MAX); + /* Assert that we have correctly flushed the ctx params into the ms's copy */ + ZSTD_assertEqualCParams(zc->appliedParams.cParams, ms->cParams); + if (srcSize < MIN_CBLOCK_SIZE+ZSTD_blockHeaderSize+1) { + if (zc->appliedParams.cParams.strategy >= ZSTD_btopt) { + ZSTD_ldm_skipRawSeqStoreBytes(&zc->externSeqStore, srcSize); + } else { + ZSTD_ldm_skipSequences(&zc->externSeqStore, srcSize, zc->appliedParams.cParams.minMatch); + } + return ZSTDbss_noCompress; /* don't even attempt compression below a certain srcSize */ + } + ZSTD_resetSeqStore(&(zc->seqStore)); + /* required for optimal parser to read stats from dictionary */ + ms->opt.symbolCosts = &zc->blockState.prevCBlock->entropy; + /* tell the optimal parser how we expect to compress literals */ + ms->opt.literalCompressionMode = zc->appliedParams.literalCompressionMode; + /* a gap between an attached dict and the current window is not safe, + * they must remain adjacent, + * and when that stops being the case, the dict must be unset */ + assert(ms->dictMatchState == NULL || ms->loadedDictEnd == ms->window.dictLimit); + + /* limited update after a very long match */ + { const BYTE* const base = ms->window.base; + const BYTE* const istart = (const BYTE*)src; + const U32 curr = (U32)(istart-base); + if (sizeof(ptrdiff_t)==8) assert(istart - base < (ptrdiff_t)(U32)(-1)); /* ensure no overflow */ + if (curr > ms->nextToUpdate + 384) + ms->nextToUpdate = curr - MIN(192, (U32)(curr - ms->nextToUpdate - 384)); + } + + /* select and store sequences */ + { ZSTD_dictMode_e const dictMode = ZSTD_matchState_dictMode(ms); + size_t lastLLSize; + { int i; + for (i = 0; i < ZSTD_REP_NUM; ++i) + zc->blockState.nextCBlock->rep[i] = zc->blockState.prevCBlock->rep[i]; + } + if (zc->externSeqStore.pos < zc->externSeqStore.size) { + assert(!zc->appliedParams.ldmParams.enableLdm); + /* Updates ldmSeqStore.pos */ + lastLLSize = + ZSTD_ldm_blockCompress(&zc->externSeqStore, + ms, &zc->seqStore, + zc->blockState.nextCBlock->rep, + zc->appliedParams.useRowMatchFinder, + src, srcSize); + assert(zc->externSeqStore.pos <= zc->externSeqStore.size); + } else if (zc->appliedParams.ldmParams.enableLdm) { + rawSeqStore_t ldmSeqStore = kNullRawSeqStore; + + ldmSeqStore.seq = zc->ldmSequences; + ldmSeqStore.capacity = zc->maxNbLdmSequences; + /* Updates ldmSeqStore.size */ + FORWARD_IF_ERROR(ZSTD_ldm_generateSequences(&zc->ldmState, &ldmSeqStore, + &zc->appliedParams.ldmParams, + src, srcSize), ""); + /* Updates ldmSeqStore.pos */ + lastLLSize = + ZSTD_ldm_blockCompress(&ldmSeqStore, + ms, &zc->seqStore, + zc->blockState.nextCBlock->rep, + zc->appliedParams.useRowMatchFinder, + src, srcSize); + assert(ldmSeqStore.pos == ldmSeqStore.size); + } else { /* not long range mode */ + ZSTD_blockCompressor const blockCompressor = ZSTD_selectBlockCompressor(zc->appliedParams.cParams.strategy, + zc->appliedParams.useRowMatchFinder, + dictMode); + ms->ldmSeqStore = NULL; + lastLLSize = blockCompressor(ms, &zc->seqStore, zc->blockState.nextCBlock->rep, src, srcSize); + } + { const BYTE* const lastLiterals = (const BYTE*)src + srcSize - lastLLSize; + ZSTD_storeLastLiterals(&zc->seqStore, lastLiterals, lastLLSize); + } } + return ZSTDbss_compress; +} + +static void ZSTD_copyBlockSequences(ZSTD_CCtx* zc) +{ + const seqStore_t* seqStore = ZSTD_getSeqStore(zc); + const seqDef* seqStoreSeqs = seqStore->sequencesStart; + size_t seqStoreSeqSize = seqStore->sequences - seqStoreSeqs; + size_t seqStoreLiteralsSize = (size_t)(seqStore->lit - seqStore->litStart); + size_t literalsRead = 0; + size_t lastLLSize; + + ZSTD_Sequence* outSeqs = &zc->seqCollector.seqStart[zc->seqCollector.seqIndex]; + size_t i; + repcodes_t updatedRepcodes; + + assert(zc->seqCollector.seqIndex + 1 < zc->seqCollector.maxSequences); + /* Ensure we have enough space for last literals "sequence" */ + assert(zc->seqCollector.maxSequences >= seqStoreSeqSize + 1); + ZSTD_memcpy(updatedRepcodes.rep, zc->blockState.prevCBlock->rep, sizeof(repcodes_t)); + for (i = 0; i < seqStoreSeqSize; ++i) { + U32 rawOffset = seqStoreSeqs[i].offset - ZSTD_REP_NUM; + outSeqs[i].litLength = seqStoreSeqs[i].litLength; + outSeqs[i].matchLength = seqStoreSeqs[i].matchLength + MINMATCH; + outSeqs[i].rep = 0; + + if (i == seqStore->longLengthPos) { + if (seqStore->longLengthType == ZSTD_llt_literalLength) { + outSeqs[i].litLength += 0x10000; + } else if (seqStore->longLengthType == ZSTD_llt_matchLength) { + outSeqs[i].matchLength += 0x10000; + } + } + + if (seqStoreSeqs[i].offset <= ZSTD_REP_NUM) { + /* Derive the correct offset corresponding to a repcode */ + outSeqs[i].rep = seqStoreSeqs[i].offset; + if (outSeqs[i].litLength != 0) { + rawOffset = updatedRepcodes.rep[outSeqs[i].rep - 1]; + } else { + if (outSeqs[i].rep == 3) { + rawOffset = updatedRepcodes.rep[0] - 1; + } else { + rawOffset = updatedRepcodes.rep[outSeqs[i].rep]; + } + } + } + outSeqs[i].offset = rawOffset; + /* seqStoreSeqs[i].offset == offCode+1, and ZSTD_updateRep() expects offCode + so we provide seqStoreSeqs[i].offset - 1 */ + updatedRepcodes = ZSTD_updateRep(updatedRepcodes.rep, + seqStoreSeqs[i].offset - 1, + seqStoreSeqs[i].litLength == 0); + literalsRead += outSeqs[i].litLength; + } + /* Insert last literals (if any exist) in the block as a sequence with ml == off == 0. + * If there are no last literals, then we'll emit (of: 0, ml: 0, ll: 0), which is a marker + * for the block boundary, according to the API. + */ + assert(seqStoreLiteralsSize >= literalsRead); + lastLLSize = seqStoreLiteralsSize - literalsRead; + outSeqs[i].litLength = (U32)lastLLSize; + outSeqs[i].matchLength = outSeqs[i].offset = outSeqs[i].rep = 0; + seqStoreSeqSize++; + zc->seqCollector.seqIndex += seqStoreSeqSize; +} + +size_t ZSTD_generateSequences(ZSTD_CCtx* zc, ZSTD_Sequence* outSeqs, + size_t outSeqsSize, const void* src, size_t srcSize) +{ + const size_t dstCapacity = ZSTD_compressBound(srcSize); + void* dst = ZSTD_customMalloc(dstCapacity, ZSTD_defaultCMem); + SeqCollector seqCollector; + + RETURN_ERROR_IF(dst == NULL, memory_allocation, "NULL pointer!"); + + seqCollector.collectSequences = 1; + seqCollector.seqStart = outSeqs; + seqCollector.seqIndex = 0; + seqCollector.maxSequences = outSeqsSize; + zc->seqCollector = seqCollector; + + ZSTD_compress2(zc, dst, dstCapacity, src, srcSize); + ZSTD_customFree(dst, ZSTD_defaultCMem); + return zc->seqCollector.seqIndex; +} + +size_t ZSTD_mergeBlockDelimiters(ZSTD_Sequence* sequences, size_t seqsSize) { + size_t in = 0; + size_t out = 0; + for (; in < seqsSize; ++in) { + if (sequences[in].offset == 0 && sequences[in].matchLength == 0) { + if (in != seqsSize - 1) { + sequences[in+1].litLength += sequences[in].litLength; + } + } else { + sequences[out] = sequences[in]; + ++out; + } + } + return out; +} + +/* Unrolled loop to read four size_ts of input at a time. Returns 1 if is RLE, 0 if not. */ +static int ZSTD_isRLE(const BYTE* src, size_t length) { + const BYTE* ip = src; + const BYTE value = ip[0]; + const size_t valueST = (size_t)((U64)value * 0x0101010101010101ULL); + const size_t unrollSize = sizeof(size_t) * 4; + const size_t unrollMask = unrollSize - 1; + const size_t prefixLength = length & unrollMask; + size_t i; + size_t u; + if (length == 1) return 1; + /* Check if prefix is RLE first before using unrolled loop */ + if (prefixLength && ZSTD_count(ip+1, ip, ip+prefixLength) != prefixLength-1) { + return 0; + } + for (i = prefixLength; i != length; i += unrollSize) { + for (u = 0; u < unrollSize; u += sizeof(size_t)) { + if (MEM_readST(ip + i + u) != valueST) { + return 0; + } + } + } + return 1; +} + +/* Returns true if the given block may be RLE. + * This is just a heuristic based on the compressibility. + * It may return both false positives and false negatives. + */ +static int ZSTD_maybeRLE(seqStore_t const* seqStore) +{ + size_t const nbSeqs = (size_t)(seqStore->sequences - seqStore->sequencesStart); + size_t const nbLits = (size_t)(seqStore->lit - seqStore->litStart); + + return nbSeqs < 4 && nbLits < 10; +} + +static void ZSTD_blockState_confirmRepcodesAndEntropyTables(ZSTD_blockState_t* const bs) +{ + ZSTD_compressedBlockState_t* const tmp = bs->prevCBlock; + bs->prevCBlock = bs->nextCBlock; + bs->nextCBlock = tmp; +} + +/* Writes the block header */ +static void writeBlockHeader(void* op, size_t cSize, size_t blockSize, U32 lastBlock) { + U32 const cBlockHeader = cSize == 1 ? + lastBlock + (((U32)bt_rle)<<1) + (U32)(blockSize << 3) : + lastBlock + (((U32)bt_compressed)<<1) + (U32)(cSize << 3); + MEM_writeLE24(op, cBlockHeader); + DEBUGLOG(3, "writeBlockHeader: cSize: %zu blockSize: %zu lastBlock: %u", cSize, blockSize, lastBlock); +} + +/** ZSTD_buildBlockEntropyStats_literals() : + * Builds entropy for the literals. + * Stores literals block type (raw, rle, compressed, repeat) and + * huffman description table to hufMetadata. + * Requires ENTROPY_WORKSPACE_SIZE workspace + * @return : size of huffman description table or error code */ +static size_t ZSTD_buildBlockEntropyStats_literals(void* const src, size_t srcSize, + const ZSTD_hufCTables_t* prevHuf, + ZSTD_hufCTables_t* nextHuf, + ZSTD_hufCTablesMetadata_t* hufMetadata, + const int disableLiteralsCompression, + void* workspace, size_t wkspSize) +{ + BYTE* const wkspStart = (BYTE*)workspace; + BYTE* const wkspEnd = wkspStart + wkspSize; + BYTE* const countWkspStart = wkspStart; + unsigned* const countWksp = (unsigned*)workspace; + const size_t countWkspSize = (HUF_SYMBOLVALUE_MAX + 1) * sizeof(unsigned); + BYTE* const nodeWksp = countWkspStart + countWkspSize; + const size_t nodeWkspSize = wkspEnd-nodeWksp; + unsigned maxSymbolValue = HUF_SYMBOLVALUE_MAX; + unsigned huffLog = HUF_TABLELOG_DEFAULT; + HUF_repeat repeat = prevHuf->repeatMode; + DEBUGLOG(5, "ZSTD_buildBlockEntropyStats_literals (srcSize=%zu)", srcSize); + + /* Prepare nextEntropy assuming reusing the existing table */ + ZSTD_memcpy(nextHuf, prevHuf, sizeof(*prevHuf)); + + if (disableLiteralsCompression) { + DEBUGLOG(5, "set_basic - disabled"); + hufMetadata->hType = set_basic; + return 0; + } + + /* small ? don't even attempt compression (speed opt) */ +#ifndef COMPRESS_LITERALS_SIZE_MIN +#define COMPRESS_LITERALS_SIZE_MIN 63 +#endif + { size_t const minLitSize = (prevHuf->repeatMode == HUF_repeat_valid) ? 6 : COMPRESS_LITERALS_SIZE_MIN; + if (srcSize <= minLitSize) { + DEBUGLOG(5, "set_basic - too small"); + hufMetadata->hType = set_basic; + return 0; + } + } + + /* Scan input and build symbol stats */ + { size_t const largest = HIST_count_wksp (countWksp, &maxSymbolValue, (const BYTE*)src, srcSize, workspace, wkspSize); + FORWARD_IF_ERROR(largest, "HIST_count_wksp failed"); + if (largest == srcSize) { + DEBUGLOG(5, "set_rle"); + hufMetadata->hType = set_rle; + return 0; + } + if (largest <= (srcSize >> 7)+4) { + DEBUGLOG(5, "set_basic - no gain"); + hufMetadata->hType = set_basic; + return 0; + } + } + + /* Validate the previous Huffman table */ + if (repeat == HUF_repeat_check && !HUF_validateCTable((HUF_CElt const*)prevHuf->CTable, countWksp, maxSymbolValue)) { + repeat = HUF_repeat_none; + } + + /* Build Huffman Tree */ + ZSTD_memset(nextHuf->CTable, 0, sizeof(nextHuf->CTable)); + huffLog = HUF_optimalTableLog(huffLog, srcSize, maxSymbolValue); + { size_t const maxBits = HUF_buildCTable_wksp((HUF_CElt*)nextHuf->CTable, countWksp, + maxSymbolValue, huffLog, + nodeWksp, nodeWkspSize); + FORWARD_IF_ERROR(maxBits, "HUF_buildCTable_wksp"); + huffLog = (U32)maxBits; + { /* Build and write the CTable */ + size_t const newCSize = HUF_estimateCompressedSize( + (HUF_CElt*)nextHuf->CTable, countWksp, maxSymbolValue); + size_t const hSize = HUF_writeCTable_wksp( + hufMetadata->hufDesBuffer, sizeof(hufMetadata->hufDesBuffer), + (HUF_CElt*)nextHuf->CTable, maxSymbolValue, huffLog, + nodeWksp, nodeWkspSize); + /* Check against repeating the previous CTable */ + if (repeat != HUF_repeat_none) { + size_t const oldCSize = HUF_estimateCompressedSize( + (HUF_CElt const*)prevHuf->CTable, countWksp, maxSymbolValue); + if (oldCSize < srcSize && (oldCSize <= hSize + newCSize || hSize + 12 >= srcSize)) { + DEBUGLOG(5, "set_repeat - smaller"); + ZSTD_memcpy(nextHuf, prevHuf, sizeof(*prevHuf)); + hufMetadata->hType = set_repeat; + return 0; + } + } + if (newCSize + hSize >= srcSize) { + DEBUGLOG(5, "set_basic - no gains"); + ZSTD_memcpy(nextHuf, prevHuf, sizeof(*prevHuf)); + hufMetadata->hType = set_basic; + return 0; + } + DEBUGLOG(5, "set_compressed (hSize=%u)", (U32)hSize); + hufMetadata->hType = set_compressed; + nextHuf->repeatMode = HUF_repeat_check; + return hSize; + } + } +} + + +/* ZSTD_buildDummySequencesStatistics(): + * Returns a ZSTD_symbolEncodingTypeStats_t with all encoding types as set_basic, + * and updates nextEntropy to the appropriate repeatMode. + */ +static ZSTD_symbolEncodingTypeStats_t +ZSTD_buildDummySequencesStatistics(ZSTD_fseCTables_t* nextEntropy) { + ZSTD_symbolEncodingTypeStats_t stats = {set_basic, set_basic, set_basic, 0, 0}; + nextEntropy->litlength_repeatMode = FSE_repeat_none; + nextEntropy->offcode_repeatMode = FSE_repeat_none; + nextEntropy->matchlength_repeatMode = FSE_repeat_none; + return stats; +} + +/** ZSTD_buildBlockEntropyStats_sequences() : + * Builds entropy for the sequences. + * Stores symbol compression modes and fse table to fseMetadata. + * Requires ENTROPY_WORKSPACE_SIZE wksp. + * @return : size of fse tables or error code */ +static size_t ZSTD_buildBlockEntropyStats_sequences(seqStore_t* seqStorePtr, + const ZSTD_fseCTables_t* prevEntropy, + ZSTD_fseCTables_t* nextEntropy, + const ZSTD_CCtx_params* cctxParams, + ZSTD_fseCTablesMetadata_t* fseMetadata, + void* workspace, size_t wkspSize) +{ + ZSTD_strategy const strategy = cctxParams->cParams.strategy; + size_t const nbSeq = seqStorePtr->sequences - seqStorePtr->sequencesStart; + BYTE* const ostart = fseMetadata->fseTablesBuffer; + BYTE* const oend = ostart + sizeof(fseMetadata->fseTablesBuffer); + BYTE* op = ostart; + unsigned* countWorkspace = (unsigned*)workspace; + unsigned* entropyWorkspace = countWorkspace + (MaxSeq + 1); + size_t entropyWorkspaceSize = wkspSize - (MaxSeq + 1) * sizeof(*countWorkspace); + ZSTD_symbolEncodingTypeStats_t stats; + + DEBUGLOG(5, "ZSTD_buildBlockEntropyStats_sequences (nbSeq=%zu)", nbSeq); + stats = nbSeq != 0 ? ZSTD_buildSequencesStatistics(seqStorePtr, nbSeq, + prevEntropy, nextEntropy, op, oend, + strategy, countWorkspace, + entropyWorkspace, entropyWorkspaceSize) + : ZSTD_buildDummySequencesStatistics(nextEntropy); + FORWARD_IF_ERROR(stats.size, "ZSTD_buildSequencesStatistics failed!"); + fseMetadata->llType = (symbolEncodingType_e) stats.LLtype; + fseMetadata->ofType = (symbolEncodingType_e) stats.Offtype; + fseMetadata->mlType = (symbolEncodingType_e) stats.MLtype; + fseMetadata->lastCountSize = stats.lastCountSize; + return stats.size; +} + + +/** ZSTD_buildBlockEntropyStats() : + * Builds entropy for the block. + * Requires workspace size ENTROPY_WORKSPACE_SIZE + * + * @return : 0 on success or error code + */ +size_t ZSTD_buildBlockEntropyStats(seqStore_t* seqStorePtr, + const ZSTD_entropyCTables_t* prevEntropy, + ZSTD_entropyCTables_t* nextEntropy, + const ZSTD_CCtx_params* cctxParams, + ZSTD_entropyCTablesMetadata_t* entropyMetadata, + void* workspace, size_t wkspSize) +{ + size_t const litSize = seqStorePtr->lit - seqStorePtr->litStart; + entropyMetadata->hufMetadata.hufDesSize = + ZSTD_buildBlockEntropyStats_literals(seqStorePtr->litStart, litSize, + &prevEntropy->huf, &nextEntropy->huf, + &entropyMetadata->hufMetadata, + ZSTD_disableLiteralsCompression(cctxParams), + workspace, wkspSize); + FORWARD_IF_ERROR(entropyMetadata->hufMetadata.hufDesSize, "ZSTD_buildBlockEntropyStats_literals failed"); + entropyMetadata->fseMetadata.fseTablesSize = + ZSTD_buildBlockEntropyStats_sequences(seqStorePtr, + &prevEntropy->fse, &nextEntropy->fse, + cctxParams, + &entropyMetadata->fseMetadata, + workspace, wkspSize); + FORWARD_IF_ERROR(entropyMetadata->fseMetadata.fseTablesSize, "ZSTD_buildBlockEntropyStats_sequences failed"); + return 0; +} + +/* Returns the size estimate for the literals section (header + content) of a block */ +static size_t ZSTD_estimateBlockSize_literal(const BYTE* literals, size_t litSize, + const ZSTD_hufCTables_t* huf, + const ZSTD_hufCTablesMetadata_t* hufMetadata, + void* workspace, size_t wkspSize, + int writeEntropy) +{ + unsigned* const countWksp = (unsigned*)workspace; + unsigned maxSymbolValue = HUF_SYMBOLVALUE_MAX; + size_t literalSectionHeaderSize = 3 + (litSize >= 1 KB) + (litSize >= 16 KB); + U32 singleStream = litSize < 256; + + if (hufMetadata->hType == set_basic) return litSize; + else if (hufMetadata->hType == set_rle) return 1; + else if (hufMetadata->hType == set_compressed || hufMetadata->hType == set_repeat) { + size_t const largest = HIST_count_wksp (countWksp, &maxSymbolValue, (const BYTE*)literals, litSize, workspace, wkspSize); + if (ZSTD_isError(largest)) return litSize; + { size_t cLitSizeEstimate = HUF_estimateCompressedSize((const HUF_CElt*)huf->CTable, countWksp, maxSymbolValue); + if (writeEntropy) cLitSizeEstimate += hufMetadata->hufDesSize; + if (!singleStream) cLitSizeEstimate += 6; /* multi-stream huffman uses 6-byte jump table */ + return cLitSizeEstimate + literalSectionHeaderSize; + } } + assert(0); /* impossible */ + return 0; +} + +/* Returns the size estimate for the FSE-compressed symbols (of, ml, ll) of a block */ +static size_t ZSTD_estimateBlockSize_symbolType(symbolEncodingType_e type, + const BYTE* codeTable, size_t nbSeq, unsigned maxCode, + const FSE_CTable* fseCTable, + const U32* additionalBits, + short const* defaultNorm, U32 defaultNormLog, U32 defaultMax, + void* workspace, size_t wkspSize) +{ + unsigned* const countWksp = (unsigned*)workspace; + const BYTE* ctp = codeTable; + const BYTE* const ctStart = ctp; + const BYTE* const ctEnd = ctStart + nbSeq; + size_t cSymbolTypeSizeEstimateInBits = 0; + unsigned max = maxCode; + + HIST_countFast_wksp(countWksp, &max, codeTable, nbSeq, workspace, wkspSize); /* can't fail */ + if (type == set_basic) { + /* We selected this encoding type, so it must be valid. */ + assert(max <= defaultMax); + (void)defaultMax; + cSymbolTypeSizeEstimateInBits = ZSTD_crossEntropyCost(defaultNorm, defaultNormLog, countWksp, max); + } else if (type == set_rle) { + cSymbolTypeSizeEstimateInBits = 0; + } else if (type == set_compressed || type == set_repeat) { + cSymbolTypeSizeEstimateInBits = ZSTD_fseBitCost(fseCTable, countWksp, max); + } + if (ZSTD_isError(cSymbolTypeSizeEstimateInBits)) { + return nbSeq * 10; + } + while (ctp < ctEnd) { + if (additionalBits) cSymbolTypeSizeEstimateInBits += additionalBits[*ctp]; + else cSymbolTypeSizeEstimateInBits += *ctp; /* for offset, offset code is also the number of additional bits */ + ctp++; + } + return cSymbolTypeSizeEstimateInBits >> 3; +} + +/* Returns the size estimate for the sequences section (header + content) of a block */ +static size_t ZSTD_estimateBlockSize_sequences(const BYTE* ofCodeTable, + const BYTE* llCodeTable, + const BYTE* mlCodeTable, + size_t nbSeq, + const ZSTD_fseCTables_t* fseTables, + const ZSTD_fseCTablesMetadata_t* fseMetadata, + void* workspace, size_t wkspSize, + int writeEntropy) +{ + size_t sequencesSectionHeaderSize = 1 /* seqHead */ + 1 /* min seqSize size */ + (nbSeq >= 128) + (nbSeq >= LONGNBSEQ); + size_t cSeqSizeEstimate = 0; + cSeqSizeEstimate += ZSTD_estimateBlockSize_symbolType(fseMetadata->ofType, ofCodeTable, nbSeq, MaxOff, + fseTables->offcodeCTable, NULL, + OF_defaultNorm, OF_defaultNormLog, DefaultMaxOff, + workspace, wkspSize); + cSeqSizeEstimate += ZSTD_estimateBlockSize_symbolType(fseMetadata->llType, llCodeTable, nbSeq, MaxLL, + fseTables->litlengthCTable, LL_bits, + LL_defaultNorm, LL_defaultNormLog, MaxLL, + workspace, wkspSize); + cSeqSizeEstimate += ZSTD_estimateBlockSize_symbolType(fseMetadata->mlType, mlCodeTable, nbSeq, MaxML, + fseTables->matchlengthCTable, ML_bits, + ML_defaultNorm, ML_defaultNormLog, MaxML, + workspace, wkspSize); + if (writeEntropy) cSeqSizeEstimate += fseMetadata->fseTablesSize; + return cSeqSizeEstimate + sequencesSectionHeaderSize; +} + +/* Returns the size estimate for a given stream of literals, of, ll, ml */ +static size_t ZSTD_estimateBlockSize(const BYTE* literals, size_t litSize, + const BYTE* ofCodeTable, + const BYTE* llCodeTable, + const BYTE* mlCodeTable, + size_t nbSeq, + const ZSTD_entropyCTables_t* entropy, + const ZSTD_entropyCTablesMetadata_t* entropyMetadata, + void* workspace, size_t wkspSize, + int writeLitEntropy, int writeSeqEntropy) { + size_t const literalsSize = ZSTD_estimateBlockSize_literal(literals, litSize, + &entropy->huf, &entropyMetadata->hufMetadata, + workspace, wkspSize, writeLitEntropy); + size_t const seqSize = ZSTD_estimateBlockSize_sequences(ofCodeTable, llCodeTable, mlCodeTable, + nbSeq, &entropy->fse, &entropyMetadata->fseMetadata, + workspace, wkspSize, writeSeqEntropy); + return seqSize + literalsSize + ZSTD_blockHeaderSize; +} + +/* Builds entropy statistics and uses them for blocksize estimation. + * + * Returns the estimated compressed size of the seqStore, or a zstd error. + */ +static size_t ZSTD_buildEntropyStatisticsAndEstimateSubBlockSize(seqStore_t* seqStore, const ZSTD_CCtx* zc) { + ZSTD_entropyCTablesMetadata_t entropyMetadata; + FORWARD_IF_ERROR(ZSTD_buildBlockEntropyStats(seqStore, + &zc->blockState.prevCBlock->entropy, + &zc->blockState.nextCBlock->entropy, + &zc->appliedParams, + &entropyMetadata, + zc->entropyWorkspace, ENTROPY_WORKSPACE_SIZE /* statically allocated in resetCCtx */), ""); + return ZSTD_estimateBlockSize(seqStore->litStart, (size_t)(seqStore->lit - seqStore->litStart), + seqStore->ofCode, seqStore->llCode, seqStore->mlCode, + (size_t)(seqStore->sequences - seqStore->sequencesStart), + &zc->blockState.nextCBlock->entropy, &entropyMetadata, zc->entropyWorkspace, ENTROPY_WORKSPACE_SIZE, + (int)(entropyMetadata.hufMetadata.hType == set_compressed), 1); +} + +/* Returns literals bytes represented in a seqStore */ +static size_t ZSTD_countSeqStoreLiteralsBytes(const seqStore_t* const seqStore) { + size_t literalsBytes = 0; + size_t const nbSeqs = seqStore->sequences - seqStore->sequencesStart; + size_t i; + for (i = 0; i < nbSeqs; ++i) { + seqDef seq = seqStore->sequencesStart[i]; + literalsBytes += seq.litLength; + if (i == seqStore->longLengthPos && seqStore->longLengthType == ZSTD_llt_literalLength) { + literalsBytes += 0x10000; + } + } + return literalsBytes; +} + +/* Returns match bytes represented in a seqStore */ +static size_t ZSTD_countSeqStoreMatchBytes(const seqStore_t* const seqStore) { + size_t matchBytes = 0; + size_t const nbSeqs = seqStore->sequences - seqStore->sequencesStart; + size_t i; + for (i = 0; i < nbSeqs; ++i) { + seqDef seq = seqStore->sequencesStart[i]; + matchBytes += seq.matchLength + MINMATCH; + if (i == seqStore->longLengthPos && seqStore->longLengthType == ZSTD_llt_matchLength) { + matchBytes += 0x10000; + } + } + return matchBytes; +} + +/* Derives the seqStore that is a chunk of the originalSeqStore from [startIdx, endIdx). + * Stores the result in resultSeqStore. + */ +static void ZSTD_deriveSeqStoreChunk(seqStore_t* resultSeqStore, + const seqStore_t* originalSeqStore, + size_t startIdx, size_t endIdx) { + BYTE* const litEnd = originalSeqStore->lit; + size_t literalsBytes; + size_t literalsBytesPreceding = 0; + + *resultSeqStore = *originalSeqStore; + if (startIdx > 0) { + resultSeqStore->sequences = originalSeqStore->sequencesStart + startIdx; + literalsBytesPreceding = ZSTD_countSeqStoreLiteralsBytes(resultSeqStore); + } + + /* Move longLengthPos into the correct position if necessary */ + if (originalSeqStore->longLengthType != ZSTD_llt_none) { + if (originalSeqStore->longLengthPos < startIdx || originalSeqStore->longLengthPos > endIdx) { + resultSeqStore->longLengthType = ZSTD_llt_none; + } else { + resultSeqStore->longLengthPos -= (U32)startIdx; + } + } + resultSeqStore->sequencesStart = originalSeqStore->sequencesStart + startIdx; + resultSeqStore->sequences = originalSeqStore->sequencesStart + endIdx; + literalsBytes = ZSTD_countSeqStoreLiteralsBytes(resultSeqStore); + resultSeqStore->litStart += literalsBytesPreceding; + if (endIdx == (size_t)(originalSeqStore->sequences - originalSeqStore->sequencesStart)) { + /* This accounts for possible last literals if the derived chunk reaches the end of the block */ + resultSeqStore->lit = litEnd; + } else { + resultSeqStore->lit = resultSeqStore->litStart+literalsBytes; + } + resultSeqStore->llCode += startIdx; + resultSeqStore->mlCode += startIdx; + resultSeqStore->ofCode += startIdx; +} + +/** + * Returns the raw offset represented by the combination of offCode, ll0, and repcode history. + * offCode must be an offCode representing a repcode, therefore in the range of [0, 2]. + */ +static U32 ZSTD_resolveRepcodeToRawOffset(const U32 rep[ZSTD_REP_NUM], const U32 offCode, const U32 ll0) { + U32 const adjustedOffCode = offCode + ll0; + assert(offCode < ZSTD_REP_NUM); + if (adjustedOffCode == ZSTD_REP_NUM) { + /* litlength == 0 and offCode == 2 implies selection of first repcode - 1 */ + assert(rep[0] > 0); + return rep[0] - 1; + } + return rep[adjustedOffCode]; +} + +/** + * ZSTD_seqStore_resolveOffCodes() reconciles any possible divergences in offset history that may arise + * due to emission of RLE/raw blocks that disturb the offset history, and replaces any repcodes within + * the seqStore that may be invalid. + * + * dRepcodes are updated as would be on the decompression side. cRepcodes are updated exactly in + * accordance with the seqStore. + */ +static void ZSTD_seqStore_resolveOffCodes(repcodes_t* const dRepcodes, repcodes_t* const cRepcodes, + seqStore_t* const seqStore, U32 const nbSeq) { + U32 idx = 0; + for (; idx < nbSeq; ++idx) { + seqDef* const seq = seqStore->sequencesStart + idx; + U32 const ll0 = (seq->litLength == 0); + U32 offCode = seq->offset - 1; + assert(seq->offset > 0); + if (offCode <= ZSTD_REP_MOVE) { + U32 const dRawOffset = ZSTD_resolveRepcodeToRawOffset(dRepcodes->rep, offCode, ll0); + U32 const cRawOffset = ZSTD_resolveRepcodeToRawOffset(cRepcodes->rep, offCode, ll0); + /* Adjust simulated decompression repcode history if we come across a mismatch. Replace + * the repcode with the offset it actually references, determined by the compression + * repcode history. + */ + if (dRawOffset != cRawOffset) { + seq->offset = cRawOffset + ZSTD_REP_NUM; + } + } + /* Compression repcode history is always updated with values directly from the unmodified seqStore. + * Decompression repcode history may use modified seq->offset value taken from compression repcode history. + */ + *dRepcodes = ZSTD_updateRep(dRepcodes->rep, seq->offset - 1, ll0); + *cRepcodes = ZSTD_updateRep(cRepcodes->rep, offCode, ll0); + } +} + +/* ZSTD_compressSeqStore_singleBlock(): + * Compresses a seqStore into a block with a block header, into the buffer dst. + * + * Returns the total size of that block (including header) or a ZSTD error code. + */ +static size_t ZSTD_compressSeqStore_singleBlock(ZSTD_CCtx* zc, seqStore_t* const seqStore, + repcodes_t* const dRep, repcodes_t* const cRep, + void* dst, size_t dstCapacity, + const void* src, size_t srcSize, + U32 lastBlock, U32 isPartition) { + const U32 rleMaxLength = 25; + BYTE* op = (BYTE*)dst; + const BYTE* ip = (const BYTE*)src; + size_t cSize; + size_t cSeqsSize; + + /* In case of an RLE or raw block, the simulated decompression repcode history must be reset */ + repcodes_t const dRepOriginal = *dRep; + if (isPartition) + ZSTD_seqStore_resolveOffCodes(dRep, cRep, seqStore, (U32)(seqStore->sequences - seqStore->sequencesStart)); + + cSeqsSize = ZSTD_entropyCompressSeqStore(seqStore, + &zc->blockState.prevCBlock->entropy, &zc->blockState.nextCBlock->entropy, + &zc->appliedParams, + op + ZSTD_blockHeaderSize, dstCapacity - ZSTD_blockHeaderSize, + srcSize, + zc->entropyWorkspace, ENTROPY_WORKSPACE_SIZE /* statically allocated in resetCCtx */, + zc->bmi2); + FORWARD_IF_ERROR(cSeqsSize, "ZSTD_entropyCompressSeqStore failed!"); + + if (!zc->isFirstBlock && + cSeqsSize < rleMaxLength && + ZSTD_isRLE((BYTE const*)src, srcSize)) { + /* We don't want to emit our first block as a RLE even if it qualifies because + * doing so will cause the decoder (cli only) to throw a "should consume all input error." + * This is only an issue for zstd <= v1.4.3 + */ + cSeqsSize = 1; + } + + if (zc->seqCollector.collectSequences) { + ZSTD_copyBlockSequences(zc); + ZSTD_blockState_confirmRepcodesAndEntropyTables(&zc->blockState); + return 0; + } + + if (zc->blockState.prevCBlock->entropy.fse.offcode_repeatMode == FSE_repeat_valid) + zc->blockState.prevCBlock->entropy.fse.offcode_repeatMode = FSE_repeat_check; + + if (cSeqsSize == 0) { + cSize = ZSTD_noCompressBlock(op, dstCapacity, ip, srcSize, lastBlock); + FORWARD_IF_ERROR(cSize, "Nocompress block failed"); + DEBUGLOG(4, "Writing out nocompress block, size: %zu", cSize); + *dRep = dRepOriginal; /* reset simulated decompression repcode history */ + } else if (cSeqsSize == 1) { + cSize = ZSTD_rleCompressBlock(op, dstCapacity, *ip, srcSize, lastBlock); + FORWARD_IF_ERROR(cSize, "RLE compress block failed"); + DEBUGLOG(4, "Writing out RLE block, size: %zu", cSize); + *dRep = dRepOriginal; /* reset simulated decompression repcode history */ + } else { + ZSTD_blockState_confirmRepcodesAndEntropyTables(&zc->blockState); + writeBlockHeader(op, cSeqsSize, srcSize, lastBlock); + cSize = ZSTD_blockHeaderSize + cSeqsSize; + DEBUGLOG(4, "Writing out compressed block, size: %zu", cSize); + } + return cSize; +} + +/* Struct to keep track of where we are in our recursive calls. */ +typedef struct { + U32* splitLocations; /* Array of split indices */ + size_t idx; /* The current index within splitLocations being worked on */ +} seqStoreSplits; + +#define MIN_SEQUENCES_BLOCK_SPLITTING 300 +#define MAX_NB_SPLITS 196 + +/* Helper function to perform the recursive search for block splits. + * Estimates the cost of seqStore prior to split, and estimates the cost of splitting the sequences in half. + * If advantageous to split, then we recurse down the two sub-blocks. If not, or if an error occurred in estimation, then + * we do not recurse. + * + * Note: The recursion depth is capped by a heuristic minimum number of sequences, defined by MIN_SEQUENCES_BLOCK_SPLITTING. + * In theory, this means the absolute largest recursion depth is 10 == log2(maxNbSeqInBlock/MIN_SEQUENCES_BLOCK_SPLITTING). + * In practice, recursion depth usually doesn't go beyond 4. + * + * Furthermore, the number of splits is capped by MAX_NB_SPLITS. At MAX_NB_SPLITS == 196 with the current existing blockSize + * maximum of 128 KB, this value is actually impossible to reach. + */ +static void ZSTD_deriveBlockSplitsHelper(seqStoreSplits* splits, size_t startIdx, size_t endIdx, + const ZSTD_CCtx* zc, const seqStore_t* origSeqStore) { + seqStore_t fullSeqStoreChunk; + seqStore_t firstHalfSeqStore; + seqStore_t secondHalfSeqStore; + size_t estimatedOriginalSize; + size_t estimatedFirstHalfSize; + size_t estimatedSecondHalfSize; + size_t midIdx = (startIdx + endIdx)/2; + + if (endIdx - startIdx < MIN_SEQUENCES_BLOCK_SPLITTING || splits->idx >= MAX_NB_SPLITS) { + return; + } + ZSTD_deriveSeqStoreChunk(&fullSeqStoreChunk, origSeqStore, startIdx, endIdx); + ZSTD_deriveSeqStoreChunk(&firstHalfSeqStore, origSeqStore, startIdx, midIdx); + ZSTD_deriveSeqStoreChunk(&secondHalfSeqStore, origSeqStore, midIdx, endIdx); + estimatedOriginalSize = ZSTD_buildEntropyStatisticsAndEstimateSubBlockSize(&fullSeqStoreChunk, zc); + estimatedFirstHalfSize = ZSTD_buildEntropyStatisticsAndEstimateSubBlockSize(&firstHalfSeqStore, zc); + estimatedSecondHalfSize = ZSTD_buildEntropyStatisticsAndEstimateSubBlockSize(&secondHalfSeqStore, zc); + DEBUGLOG(5, "Estimated original block size: %zu -- First half split: %zu -- Second half split: %zu", + estimatedOriginalSize, estimatedFirstHalfSize, estimatedSecondHalfSize); + if (ZSTD_isError(estimatedOriginalSize) || ZSTD_isError(estimatedFirstHalfSize) || ZSTD_isError(estimatedSecondHalfSize)) { + return; + } + if (estimatedFirstHalfSize + estimatedSecondHalfSize < estimatedOriginalSize) { + ZSTD_deriveBlockSplitsHelper(splits, startIdx, midIdx, zc, origSeqStore); + splits->splitLocations[splits->idx] = (U32)midIdx; + splits->idx++; + ZSTD_deriveBlockSplitsHelper(splits, midIdx, endIdx, zc, origSeqStore); + } +} + +/* Base recursive function. Populates a table with intra-block partition indices that can improve compression ratio. + * + * Returns the number of splits made (which equals the size of the partition table - 1). + */ +static size_t ZSTD_deriveBlockSplits(ZSTD_CCtx* zc, U32 partitions[], U32 nbSeq) { + seqStoreSplits splits = {partitions, 0}; + if (nbSeq <= 4) { + DEBUGLOG(4, "ZSTD_deriveBlockSplits: Too few sequences to split"); + /* Refuse to try and split anything with less than 4 sequences */ + return 0; + } + ZSTD_deriveBlockSplitsHelper(&splits, 0, nbSeq, zc, &zc->seqStore); + splits.splitLocations[splits.idx] = nbSeq; + DEBUGLOG(5, "ZSTD_deriveBlockSplits: final nb partitions: %zu", splits.idx+1); + return splits.idx; +} + +/* ZSTD_compressBlock_splitBlock(): + * Attempts to split a given block into multiple blocks to improve compression ratio. + * + * Returns combined size of all blocks (which includes headers), or a ZSTD error code. + */ +static size_t ZSTD_compressBlock_splitBlock_internal(ZSTD_CCtx* zc, void* dst, size_t dstCapacity, + const void* src, size_t blockSize, U32 lastBlock, U32 nbSeq) { + size_t cSize = 0; + const BYTE* ip = (const BYTE*)src; + BYTE* op = (BYTE*)dst; + U32 partitions[MAX_NB_SPLITS]; + size_t i = 0; + size_t srcBytesTotal = 0; + size_t numSplits = ZSTD_deriveBlockSplits(zc, partitions, nbSeq); + seqStore_t nextSeqStore; + seqStore_t currSeqStore; + + /* If a block is split and some partitions are emitted as RLE/uncompressed, then repcode history + * may become invalid. In order to reconcile potentially invalid repcodes, we keep track of two + * separate repcode histories that simulate repcode history on compression and decompression side, + * and use the histories to determine whether we must replace a particular repcode with its raw offset. + * + * 1) cRep gets updated for each partition, regardless of whether the block was emitted as uncompressed + * or RLE. This allows us to retrieve the offset value that an invalid repcode references within + * a nocompress/RLE block. + * 2) dRep gets updated only for compressed partitions, and when a repcode gets replaced, will use + * the replacement offset value rather than the original repcode to update the repcode history. + * dRep also will be the final repcode history sent to the next block. + * + * See ZSTD_seqStore_resolveOffCodes() for more details. + */ + repcodes_t dRep; + repcodes_t cRep; + ZSTD_memcpy(dRep.rep, zc->blockState.prevCBlock->rep, sizeof(repcodes_t)); + ZSTD_memcpy(cRep.rep, zc->blockState.prevCBlock->rep, sizeof(repcodes_t)); + + DEBUGLOG(4, "ZSTD_compressBlock_splitBlock_internal (dstCapacity=%u, dictLimit=%u, nextToUpdate=%u)", + (unsigned)dstCapacity, (unsigned)zc->blockState.matchState.window.dictLimit, + (unsigned)zc->blockState.matchState.nextToUpdate); + + if (numSplits == 0) { + size_t cSizeSingleBlock = ZSTD_compressSeqStore_singleBlock(zc, &zc->seqStore, + &dRep, &cRep, + op, dstCapacity, + ip, blockSize, + lastBlock, 0 /* isPartition */); + FORWARD_IF_ERROR(cSizeSingleBlock, "Compressing single block from splitBlock_internal() failed!"); + DEBUGLOG(5, "ZSTD_compressBlock_splitBlock_internal: No splits"); + assert(cSizeSingleBlock <= ZSTD_BLOCKSIZE_MAX + ZSTD_blockHeaderSize); + return cSizeSingleBlock; + } + + ZSTD_deriveSeqStoreChunk(&currSeqStore, &zc->seqStore, 0, partitions[0]); + for (i = 0; i <= numSplits; ++i) { + size_t srcBytes; + size_t cSizeChunk; + U32 const lastPartition = (i == numSplits); + U32 lastBlockEntireSrc = 0; + + srcBytes = ZSTD_countSeqStoreLiteralsBytes(&currSeqStore) + ZSTD_countSeqStoreMatchBytes(&currSeqStore); + srcBytesTotal += srcBytes; + if (lastPartition) { + /* This is the final partition, need to account for possible last literals */ + srcBytes += blockSize - srcBytesTotal; + lastBlockEntireSrc = lastBlock; + } else { + ZSTD_deriveSeqStoreChunk(&nextSeqStore, &zc->seqStore, partitions[i], partitions[i+1]); + } + + cSizeChunk = ZSTD_compressSeqStore_singleBlock(zc, &currSeqStore, + &dRep, &cRep, + op, dstCapacity, + ip, srcBytes, + lastBlockEntireSrc, 1 /* isPartition */); + DEBUGLOG(5, "Estimated size: %zu actual size: %zu", ZSTD_buildEntropyStatisticsAndEstimateSubBlockSize(&currSeqStore, zc), cSizeChunk); + FORWARD_IF_ERROR(cSizeChunk, "Compressing chunk failed!"); + + ip += srcBytes; + op += cSizeChunk; + dstCapacity -= cSizeChunk; + cSize += cSizeChunk; + currSeqStore = nextSeqStore; + assert(cSizeChunk <= ZSTD_BLOCKSIZE_MAX + ZSTD_blockHeaderSize); + } + /* cRep and dRep may have diverged during the compression. If so, we use the dRep repcodes + * for the next block. + */ + ZSTD_memcpy(zc->blockState.prevCBlock->rep, dRep.rep, sizeof(repcodes_t)); + return cSize; +} + +static size_t ZSTD_compressBlock_splitBlock(ZSTD_CCtx* zc, + void* dst, size_t dstCapacity, + const void* src, size_t srcSize, U32 lastBlock) { + const BYTE* ip = (const BYTE*)src; + BYTE* op = (BYTE*)dst; + U32 nbSeq; + size_t cSize; + DEBUGLOG(4, "ZSTD_compressBlock_splitBlock"); + + { const size_t bss = ZSTD_buildSeqStore(zc, src, srcSize); + FORWARD_IF_ERROR(bss, "ZSTD_buildSeqStore failed"); + if (bss == ZSTDbss_noCompress) { + if (zc->blockState.prevCBlock->entropy.fse.offcode_repeatMode == FSE_repeat_valid) + zc->blockState.prevCBlock->entropy.fse.offcode_repeatMode = FSE_repeat_check; + cSize = ZSTD_noCompressBlock(op, dstCapacity, ip, srcSize, lastBlock); + FORWARD_IF_ERROR(cSize, "ZSTD_noCompressBlock failed"); + DEBUGLOG(4, "ZSTD_compressBlock_splitBlock: Nocompress block"); + return cSize; + } + nbSeq = (U32)(zc->seqStore.sequences - zc->seqStore.sequencesStart); + } + + assert(zc->appliedParams.splitBlocks == 1); + cSize = ZSTD_compressBlock_splitBlock_internal(zc, dst, dstCapacity, src, srcSize, lastBlock, nbSeq); + FORWARD_IF_ERROR(cSize, "Splitting blocks failed!"); + return cSize; +} + +static size_t ZSTD_compressBlock_internal(ZSTD_CCtx* zc, + void* dst, size_t dstCapacity, + const void* src, size_t srcSize, U32 frame) +{ + /* This the upper bound for the length of an rle block. + * This isn't the actual upper bound. Finding the real threshold + * needs further investigation. + */ + const U32 rleMaxLength = 25; + size_t cSize; + const BYTE* ip = (const BYTE*)src; + BYTE* op = (BYTE*)dst; + DEBUGLOG(5, "ZSTD_compressBlock_internal (dstCapacity=%u, dictLimit=%u, nextToUpdate=%u)", + (unsigned)dstCapacity, (unsigned)zc->blockState.matchState.window.dictLimit, + (unsigned)zc->blockState.matchState.nextToUpdate); + + { const size_t bss = ZSTD_buildSeqStore(zc, src, srcSize); + FORWARD_IF_ERROR(bss, "ZSTD_buildSeqStore failed"); + if (bss == ZSTDbss_noCompress) { cSize = 0; goto out; } + } + + if (zc->seqCollector.collectSequences) { + ZSTD_copyBlockSequences(zc); + ZSTD_blockState_confirmRepcodesAndEntropyTables(&zc->blockState); + return 0; + } + + /* encode sequences and literals */ + cSize = ZSTD_entropyCompressSeqStore(&zc->seqStore, + &zc->blockState.prevCBlock->entropy, &zc->blockState.nextCBlock->entropy, + &zc->appliedParams, + dst, dstCapacity, + srcSize, + zc->entropyWorkspace, ENTROPY_WORKSPACE_SIZE /* statically allocated in resetCCtx */, + zc->bmi2); + + if (zc->seqCollector.collectSequences) { + ZSTD_copyBlockSequences(zc); + return 0; + } + + + if (frame && + /* We don't want to emit our first block as a RLE even if it qualifies because + * doing so will cause the decoder (cli only) to throw a "should consume all input error." + * This is only an issue for zstd <= v1.4.3 + */ + !zc->isFirstBlock && + cSize < rleMaxLength && + ZSTD_isRLE(ip, srcSize)) + { + cSize = 1; + op[0] = ip[0]; + } + +out: + if (!ZSTD_isError(cSize) && cSize > 1) { + ZSTD_blockState_confirmRepcodesAndEntropyTables(&zc->blockState); + } + /* We check that dictionaries have offset codes available for the first + * block. After the first block, the offcode table might not have large + * enough codes to represent the offsets in the data. + */ + if (zc->blockState.prevCBlock->entropy.fse.offcode_repeatMode == FSE_repeat_valid) + zc->blockState.prevCBlock->entropy.fse.offcode_repeatMode = FSE_repeat_check; + + return cSize; +} + +static size_t ZSTD_compressBlock_targetCBlockSize_body(ZSTD_CCtx* zc, + void* dst, size_t dstCapacity, + const void* src, size_t srcSize, + const size_t bss, U32 lastBlock) +{ + DEBUGLOG(6, "Attempting ZSTD_compressSuperBlock()"); + if (bss == ZSTDbss_compress) { + if (/* We don't want to emit our first block as a RLE even if it qualifies because + * doing so will cause the decoder (cli only) to throw a "should consume all input error." + * This is only an issue for zstd <= v1.4.3 + */ + !zc->isFirstBlock && + ZSTD_maybeRLE(&zc->seqStore) && + ZSTD_isRLE((BYTE const*)src, srcSize)) + { + return ZSTD_rleCompressBlock(dst, dstCapacity, *(BYTE const*)src, srcSize, lastBlock); + } + /* Attempt superblock compression. + * + * Note that compressed size of ZSTD_compressSuperBlock() is not bound by the + * standard ZSTD_compressBound(). This is a problem, because even if we have + * space now, taking an extra byte now could cause us to run out of space later + * and violate ZSTD_compressBound(). + * + * Define blockBound(blockSize) = blockSize + ZSTD_blockHeaderSize. + * + * In order to respect ZSTD_compressBound() we must attempt to emit a raw + * uncompressed block in these cases: + * * cSize == 0: Return code for an uncompressed block. + * * cSize == dstSize_tooSmall: We may have expanded beyond blockBound(srcSize). + * ZSTD_noCompressBlock() will return dstSize_tooSmall if we are really out of + * output space. + * * cSize >= blockBound(srcSize): We have expanded the block too much so + * emit an uncompressed block. + */ + { + size_t const cSize = ZSTD_compressSuperBlock(zc, dst, dstCapacity, src, srcSize, lastBlock); + if (cSize != ERROR(dstSize_tooSmall)) { + size_t const maxCSize = srcSize - ZSTD_minGain(srcSize, zc->appliedParams.cParams.strategy); + FORWARD_IF_ERROR(cSize, "ZSTD_compressSuperBlock failed"); + if (cSize != 0 && cSize < maxCSize + ZSTD_blockHeaderSize) { + ZSTD_blockState_confirmRepcodesAndEntropyTables(&zc->blockState); + return cSize; + } + } + } + } + + DEBUGLOG(6, "Resorting to ZSTD_noCompressBlock()"); + /* Superblock compression failed, attempt to emit a single no compress block. + * The decoder will be able to stream this block since it is uncompressed. + */ + return ZSTD_noCompressBlock(dst, dstCapacity, src, srcSize, lastBlock); +} + +static size_t ZSTD_compressBlock_targetCBlockSize(ZSTD_CCtx* zc, + void* dst, size_t dstCapacity, + const void* src, size_t srcSize, + U32 lastBlock) +{ + size_t cSize = 0; + const size_t bss = ZSTD_buildSeqStore(zc, src, srcSize); + DEBUGLOG(5, "ZSTD_compressBlock_targetCBlockSize (dstCapacity=%u, dictLimit=%u, nextToUpdate=%u, srcSize=%zu)", + (unsigned)dstCapacity, (unsigned)zc->blockState.matchState.window.dictLimit, (unsigned)zc->blockState.matchState.nextToUpdate, srcSize); + FORWARD_IF_ERROR(bss, "ZSTD_buildSeqStore failed"); + + cSize = ZSTD_compressBlock_targetCBlockSize_body(zc, dst, dstCapacity, src, srcSize, bss, lastBlock); + FORWARD_IF_ERROR(cSize, "ZSTD_compressBlock_targetCBlockSize_body failed"); + + if (zc->blockState.prevCBlock->entropy.fse.offcode_repeatMode == FSE_repeat_valid) + zc->blockState.prevCBlock->entropy.fse.offcode_repeatMode = FSE_repeat_check; + + return cSize; +} + +static void ZSTD_overflowCorrectIfNeeded(ZSTD_matchState_t* ms, + ZSTD_cwksp* ws, + ZSTD_CCtx_params const* params, + void const* ip, + void const* iend) +{ + U32 const cycleLog = ZSTD_cycleLog(params->cParams.chainLog, params->cParams.strategy); + U32 const maxDist = (U32)1 << params->cParams.windowLog; + if (ZSTD_window_needOverflowCorrection(ms->window, cycleLog, maxDist, ms->loadedDictEnd, ip, iend)) { + U32 const correction = ZSTD_window_correctOverflow(&ms->window, cycleLog, maxDist, ip); + ZSTD_STATIC_ASSERT(ZSTD_CHAINLOG_MAX <= 30); + ZSTD_STATIC_ASSERT(ZSTD_WINDOWLOG_MAX_32 <= 30); + ZSTD_STATIC_ASSERT(ZSTD_WINDOWLOG_MAX <= 31); + ZSTD_cwksp_mark_tables_dirty(ws); + ZSTD_reduceIndex(ms, params, correction); + ZSTD_cwksp_mark_tables_clean(ws); + if (ms->nextToUpdate < correction) ms->nextToUpdate = 0; + else ms->nextToUpdate -= correction; + /* invalidate dictionaries on overflow correction */ + ms->loadedDictEnd = 0; + ms->dictMatchState = NULL; + } +} + +/*! ZSTD_compress_frameChunk() : +* Compress a chunk of data into one or multiple blocks. +* All blocks will be terminated, all input will be consumed. +* Function will issue an error if there is not enough `dstCapacity` to hold the compressed content. +* Frame is supposed already started (header already produced) +* @return : compressed size, or an error code +*/ +static size_t ZSTD_compress_frameChunk(ZSTD_CCtx* cctx, + void* dst, size_t dstCapacity, + const void* src, size_t srcSize, + U32 lastFrameChunk) +{ + size_t blockSize = cctx->blockSize; + size_t remaining = srcSize; + const BYTE* ip = (const BYTE*)src; + BYTE* const ostart = (BYTE*)dst; + BYTE* op = ostart; + U32 const maxDist = (U32)1 << cctx->appliedParams.cParams.windowLog; + + assert(cctx->appliedParams.cParams.windowLog <= ZSTD_WINDOWLOG_MAX); + + DEBUGLOG(4, "ZSTD_compress_frameChunk (blockSize=%u)", (unsigned)blockSize); + if (cctx->appliedParams.fParams.checksumFlag && srcSize) + XXH64_update(&cctx->xxhState, src, srcSize); + + while (remaining) { + ZSTD_matchState_t* const ms = &cctx->blockState.matchState; + U32 const lastBlock = lastFrameChunk & (blockSize >= remaining); + + RETURN_ERROR_IF(dstCapacity < ZSTD_blockHeaderSize + MIN_CBLOCK_SIZE, + dstSize_tooSmall, + "not enough space to store compressed block"); + if (remaining < blockSize) blockSize = remaining; + + ZSTD_overflowCorrectIfNeeded( + ms, &cctx->workspace, &cctx->appliedParams, ip, ip + blockSize); + ZSTD_checkDictValidity(&ms->window, ip + blockSize, maxDist, &ms->loadedDictEnd, &ms->dictMatchState); + + /* Ensure hash/chain table insertion resumes no sooner than lowlimit */ + if (ms->nextToUpdate < ms->window.lowLimit) ms->nextToUpdate = ms->window.lowLimit; + + { size_t cSize; + if (ZSTD_useTargetCBlockSize(&cctx->appliedParams)) { + cSize = ZSTD_compressBlock_targetCBlockSize(cctx, op, dstCapacity, ip, blockSize, lastBlock); + FORWARD_IF_ERROR(cSize, "ZSTD_compressBlock_targetCBlockSize failed"); + assert(cSize > 0); + assert(cSize <= blockSize + ZSTD_blockHeaderSize); + } else if (ZSTD_blockSplitterEnabled(&cctx->appliedParams)) { + cSize = ZSTD_compressBlock_splitBlock(cctx, op, dstCapacity, ip, blockSize, lastBlock); + FORWARD_IF_ERROR(cSize, "ZSTD_compressBlock_splitBlock failed"); + assert(cSize > 0 || cctx->seqCollector.collectSequences == 1); + } else { + cSize = ZSTD_compressBlock_internal(cctx, + op+ZSTD_blockHeaderSize, dstCapacity-ZSTD_blockHeaderSize, + ip, blockSize, 1 /* frame */); + FORWARD_IF_ERROR(cSize, "ZSTD_compressBlock_internal failed"); + + if (cSize == 0) { /* block is not compressible */ + cSize = ZSTD_noCompressBlock(op, dstCapacity, ip, blockSize, lastBlock); + FORWARD_IF_ERROR(cSize, "ZSTD_noCompressBlock failed"); + } else { + U32 const cBlockHeader = cSize == 1 ? + lastBlock + (((U32)bt_rle)<<1) + (U32)(blockSize << 3) : + lastBlock + (((U32)bt_compressed)<<1) + (U32)(cSize << 3); + MEM_writeLE24(op, cBlockHeader); + cSize += ZSTD_blockHeaderSize; + } + } + + + ip += blockSize; + assert(remaining >= blockSize); + remaining -= blockSize; + op += cSize; + assert(dstCapacity >= cSize); + dstCapacity -= cSize; + cctx->isFirstBlock = 0; + DEBUGLOG(5, "ZSTD_compress_frameChunk: adding a block of size %u", + (unsigned)cSize); + } } + + if (lastFrameChunk && (op>ostart)) cctx->stage = ZSTDcs_ending; + return (size_t)(op-ostart); +} + + +static size_t ZSTD_writeFrameHeader(void* dst, size_t dstCapacity, + const ZSTD_CCtx_params* params, U64 pledgedSrcSize, U32 dictID) +{ BYTE* const op = (BYTE*)dst; + U32 const dictIDSizeCodeLength = (dictID>0) + (dictID>=256) + (dictID>=65536); /* 0-3 */ + U32 const dictIDSizeCode = params->fParams.noDictIDFlag ? 0 : dictIDSizeCodeLength; /* 0-3 */ + U32 const checksumFlag = params->fParams.checksumFlag>0; + U32 const windowSize = (U32)1 << params->cParams.windowLog; + U32 const singleSegment = params->fParams.contentSizeFlag && (windowSize >= pledgedSrcSize); + BYTE const windowLogByte = (BYTE)((params->cParams.windowLog - ZSTD_WINDOWLOG_ABSOLUTEMIN) << 3); + U32 const fcsCode = params->fParams.contentSizeFlag ? + (pledgedSrcSize>=256) + (pledgedSrcSize>=65536+256) + (pledgedSrcSize>=0xFFFFFFFFU) : 0; /* 0-3 */ + BYTE const frameHeaderDescriptionByte = (BYTE)(dictIDSizeCode + (checksumFlag<<2) + (singleSegment<<5) + (fcsCode<<6) ); + size_t pos=0; + + assert(!(params->fParams.contentSizeFlag && pledgedSrcSize == ZSTD_CONTENTSIZE_UNKNOWN)); + RETURN_ERROR_IF(dstCapacity < ZSTD_FRAMEHEADERSIZE_MAX, dstSize_tooSmall, + "dst buf is too small to fit worst-case frame header size."); + DEBUGLOG(4, "ZSTD_writeFrameHeader : dictIDFlag : %u ; dictID : %u ; dictIDSizeCode : %u", + !params->fParams.noDictIDFlag, (unsigned)dictID, (unsigned)dictIDSizeCode); + if (params->format == ZSTD_f_zstd1) { + MEM_writeLE32(dst, ZSTD_MAGICNUMBER); + pos = 4; + } + op[pos++] = frameHeaderDescriptionByte; + if (!singleSegment) op[pos++] = windowLogByte; + switch(dictIDSizeCode) + { + default: assert(0); /* impossible */ + case 0 : break; + case 1 : op[pos] = (BYTE)(dictID); pos++; break; + case 2 : MEM_writeLE16(op+pos, (U16)dictID); pos+=2; break; + case 3 : MEM_writeLE32(op+pos, dictID); pos+=4; break; + } + switch(fcsCode) + { + default: assert(0); /* impossible */ + case 0 : if (singleSegment) op[pos++] = (BYTE)(pledgedSrcSize); break; + case 1 : MEM_writeLE16(op+pos, (U16)(pledgedSrcSize-256)); pos+=2; break; + case 2 : MEM_writeLE32(op+pos, (U32)(pledgedSrcSize)); pos+=4; break; + case 3 : MEM_writeLE64(op+pos, (U64)(pledgedSrcSize)); pos+=8; break; + } + return pos; +} + +/* ZSTD_writeSkippableFrame_advanced() : + * Writes out a skippable frame with the specified magic number variant (16 are supported), + * from ZSTD_MAGIC_SKIPPABLE_START to ZSTD_MAGIC_SKIPPABLE_START+15, and the desired source data. + * + * Returns the total number of bytes written, or a ZSTD error code. + */ +size_t ZSTD_writeSkippableFrame(void* dst, size_t dstCapacity, + const void* src, size_t srcSize, unsigned magicVariant) { + BYTE* op = (BYTE*)dst; + RETURN_ERROR_IF(dstCapacity < srcSize + ZSTD_SKIPPABLEHEADERSIZE /* Skippable frame overhead */, + dstSize_tooSmall, "Not enough room for skippable frame"); + RETURN_ERROR_IF(srcSize > (unsigned)0xFFFFFFFF, srcSize_wrong, "Src size too large for skippable frame"); + RETURN_ERROR_IF(magicVariant > 15, parameter_outOfBound, "Skippable frame magic number variant not supported"); + + MEM_writeLE32(op, (U32)(ZSTD_MAGIC_SKIPPABLE_START + magicVariant)); + MEM_writeLE32(op+4, (U32)srcSize); + ZSTD_memcpy(op+8, src, srcSize); + return srcSize + ZSTD_SKIPPABLEHEADERSIZE; +} + +/* ZSTD_writeLastEmptyBlock() : + * output an empty Block with end-of-frame mark to complete a frame + * @return : size of data written into `dst` (== ZSTD_blockHeaderSize (defined in zstd_internal.h)) + * or an error code if `dstCapacity` is too small (stage != ZSTDcs_init, stage_wrong, + "wrong cctx stage"); + RETURN_ERROR_IF(cctx->appliedParams.ldmParams.enableLdm, + parameter_unsupported, + "incompatible with ldm"); + cctx->externSeqStore.seq = seq; + cctx->externSeqStore.size = nbSeq; + cctx->externSeqStore.capacity = nbSeq; + cctx->externSeqStore.pos = 0; + cctx->externSeqStore.posInSequence = 0; + return 0; +} + + +static size_t ZSTD_compressContinue_internal (ZSTD_CCtx* cctx, + void* dst, size_t dstCapacity, + const void* src, size_t srcSize, + U32 frame, U32 lastFrameChunk) +{ + ZSTD_matchState_t* const ms = &cctx->blockState.matchState; + size_t fhSize = 0; + + DEBUGLOG(5, "ZSTD_compressContinue_internal, stage: %u, srcSize: %u", + cctx->stage, (unsigned)srcSize); + RETURN_ERROR_IF(cctx->stage==ZSTDcs_created, stage_wrong, + "missing init (ZSTD_compressBegin)"); + + if (frame && (cctx->stage==ZSTDcs_init)) { + fhSize = ZSTD_writeFrameHeader(dst, dstCapacity, &cctx->appliedParams, + cctx->pledgedSrcSizePlusOne-1, cctx->dictID); + FORWARD_IF_ERROR(fhSize, "ZSTD_writeFrameHeader failed"); + assert(fhSize <= dstCapacity); + dstCapacity -= fhSize; + dst = (char*)dst + fhSize; + cctx->stage = ZSTDcs_ongoing; + } + + if (!srcSize) return fhSize; /* do not generate an empty block if no input */ + + if (!ZSTD_window_update(&ms->window, src, srcSize, ms->forceNonContiguous)) { + ms->forceNonContiguous = 0; + ms->nextToUpdate = ms->window.dictLimit; + } + if (cctx->appliedParams.ldmParams.enableLdm) { + ZSTD_window_update(&cctx->ldmState.window, src, srcSize, /* forceNonContiguous */ 0); + } + + if (!frame) { + /* overflow check and correction for block mode */ + ZSTD_overflowCorrectIfNeeded( + ms, &cctx->workspace, &cctx->appliedParams, + src, (BYTE const*)src + srcSize); + } + + DEBUGLOG(5, "ZSTD_compressContinue_internal (blockSize=%u)", (unsigned)cctx->blockSize); + { size_t const cSize = frame ? + ZSTD_compress_frameChunk (cctx, dst, dstCapacity, src, srcSize, lastFrameChunk) : + ZSTD_compressBlock_internal (cctx, dst, dstCapacity, src, srcSize, 0 /* frame */); + FORWARD_IF_ERROR(cSize, "%s", frame ? "ZSTD_compress_frameChunk failed" : "ZSTD_compressBlock_internal failed"); + cctx->consumedSrcSize += srcSize; + cctx->producedCSize += (cSize + fhSize); + assert(!(cctx->appliedParams.fParams.contentSizeFlag && cctx->pledgedSrcSizePlusOne == 0)); + if (cctx->pledgedSrcSizePlusOne != 0) { /* control src size */ + ZSTD_STATIC_ASSERT(ZSTD_CONTENTSIZE_UNKNOWN == (unsigned long long)-1); + RETURN_ERROR_IF( + cctx->consumedSrcSize+1 > cctx->pledgedSrcSizePlusOne, + srcSize_wrong, + "error : pledgedSrcSize = %u, while realSrcSize >= %u", + (unsigned)cctx->pledgedSrcSizePlusOne-1, + (unsigned)cctx->consumedSrcSize); + } + return cSize + fhSize; + } +} + +size_t ZSTD_compressContinue (ZSTD_CCtx* cctx, + void* dst, size_t dstCapacity, + const void* src, size_t srcSize) +{ + DEBUGLOG(5, "ZSTD_compressContinue (srcSize=%u)", (unsigned)srcSize); + return ZSTD_compressContinue_internal(cctx, dst, dstCapacity, src, srcSize, 1 /* frame mode */, 0 /* last chunk */); +} + + +size_t ZSTD_getBlockSize(const ZSTD_CCtx* cctx) +{ + ZSTD_compressionParameters const cParams = cctx->appliedParams.cParams; + assert(!ZSTD_checkCParams(cParams)); + return MIN (ZSTD_BLOCKSIZE_MAX, (U32)1 << cParams.windowLog); +} + +size_t ZSTD_compressBlock(ZSTD_CCtx* cctx, void* dst, size_t dstCapacity, const void* src, size_t srcSize) +{ + DEBUGLOG(5, "ZSTD_compressBlock: srcSize = %u", (unsigned)srcSize); + { size_t const blockSizeMax = ZSTD_getBlockSize(cctx); + RETURN_ERROR_IF(srcSize > blockSizeMax, srcSize_wrong, "input is larger than a block"); } + + return ZSTD_compressContinue_internal(cctx, dst, dstCapacity, src, srcSize, 0 /* frame mode */, 0 /* last chunk */); +} + +/*! ZSTD_loadDictionaryContent() : + * @return : 0, or an error code + */ +static size_t ZSTD_loadDictionaryContent(ZSTD_matchState_t* ms, + ldmState_t* ls, + ZSTD_cwksp* ws, + ZSTD_CCtx_params const* params, + const void* src, size_t srcSize, + ZSTD_dictTableLoadMethod_e dtlm) +{ + const BYTE* ip = (const BYTE*) src; + const BYTE* const iend = ip + srcSize; + int const loadLdmDict = params->ldmParams.enableLdm && ls != NULL; + + /* Assert that we the ms params match the params we're being given */ + ZSTD_assertEqualCParams(params->cParams, ms->cParams); + + if (srcSize > ZSTD_CHUNKSIZE_MAX) { + /* Allow the dictionary to set indices up to exactly ZSTD_CURRENT_MAX. + * Dictionaries right at the edge will immediately trigger overflow + * correction, but I don't want to insert extra constraints here. + */ + U32 const maxDictSize = ZSTD_CURRENT_MAX - 1; + /* We must have cleared our windows when our source is this large. */ + assert(ZSTD_window_isEmpty(ms->window)); + if (loadLdmDict) + assert(ZSTD_window_isEmpty(ls->window)); + /* If the dictionary is too large, only load the suffix of the dictionary. */ + if (srcSize > maxDictSize) { + ip = iend - maxDictSize; + src = ip; + srcSize = maxDictSize; + } + } + + DEBUGLOG(4, "ZSTD_loadDictionaryContent(): useRowMatchFinder=%d", (int)params->useRowMatchFinder); + ZSTD_window_update(&ms->window, src, srcSize, /* forceNonContiguous */ 0); + ms->loadedDictEnd = params->forceWindow ? 0 : (U32)(iend - ms->window.base); + ms->forceNonContiguous = params->deterministicRefPrefix; + + if (loadLdmDict) { + ZSTD_window_update(&ls->window, src, srcSize, /* forceNonContiguous */ 0); + ls->loadedDictEnd = params->forceWindow ? 0 : (U32)(iend - ls->window.base); + } + + if (srcSize <= HASH_READ_SIZE) return 0; + + ZSTD_overflowCorrectIfNeeded(ms, ws, params, ip, iend); + + if (loadLdmDict) + ZSTD_ldm_fillHashTable(ls, ip, iend, ¶ms->ldmParams); + + switch(params->cParams.strategy) + { + case ZSTD_fast: + ZSTD_fillHashTable(ms, iend, dtlm); + break; + case ZSTD_dfast: + ZSTD_fillDoubleHashTable(ms, iend, dtlm); + break; + + case ZSTD_greedy: + case ZSTD_lazy: + case ZSTD_lazy2: + assert(srcSize >= HASH_READ_SIZE); + if (ms->dedicatedDictSearch) { + assert(ms->chainTable != NULL); + ZSTD_dedicatedDictSearch_lazy_loadDictionary(ms, iend-HASH_READ_SIZE); + } else { + assert(params->useRowMatchFinder != ZSTD_urm_auto); + if (params->useRowMatchFinder == ZSTD_urm_enableRowMatchFinder) { + size_t const tagTableSize = ((size_t)1 << params->cParams.hashLog) * sizeof(U16); + ZSTD_memset(ms->tagTable, 0, tagTableSize); + ZSTD_row_update(ms, iend-HASH_READ_SIZE); + DEBUGLOG(4, "Using row-based hash table for lazy dict"); + } else { + ZSTD_insertAndFindFirstIndex(ms, iend-HASH_READ_SIZE); + DEBUGLOG(4, "Using chain-based hash table for lazy dict"); + } + } + break; + + case ZSTD_btlazy2: /* we want the dictionary table fully sorted */ + case ZSTD_btopt: + case ZSTD_btultra: + case ZSTD_btultra2: + assert(srcSize >= HASH_READ_SIZE); + ZSTD_updateTree(ms, iend-HASH_READ_SIZE, iend); + break; + + default: + assert(0); /* not possible : not a valid strategy id */ + } + + ms->nextToUpdate = (U32)(iend - ms->window.base); + return 0; +} + + +/* Dictionaries that assign zero probability to symbols that show up causes problems + * when FSE encoding. Mark dictionaries with zero probability symbols as FSE_repeat_check + * and only dictionaries with 100% valid symbols can be assumed valid. + */ +static FSE_repeat ZSTD_dictNCountRepeat(short* normalizedCounter, unsigned dictMaxSymbolValue, unsigned maxSymbolValue) +{ + U32 s; + if (dictMaxSymbolValue < maxSymbolValue) { + return FSE_repeat_check; + } + for (s = 0; s <= maxSymbolValue; ++s) { + if (normalizedCounter[s] == 0) { + return FSE_repeat_check; + } + } + return FSE_repeat_valid; +} + +size_t ZSTD_loadCEntropy(ZSTD_compressedBlockState_t* bs, void* workspace, + const void* const dict, size_t dictSize) +{ + short offcodeNCount[MaxOff+1]; + unsigned offcodeMaxValue = MaxOff; + const BYTE* dictPtr = (const BYTE*)dict; /* skip magic num and dict ID */ + const BYTE* const dictEnd = dictPtr + dictSize; + dictPtr += 8; + bs->entropy.huf.repeatMode = HUF_repeat_check; + + { unsigned maxSymbolValue = 255; + unsigned hasZeroWeights = 1; + size_t const hufHeaderSize = HUF_readCTable((HUF_CElt*)bs->entropy.huf.CTable, &maxSymbolValue, dictPtr, + dictEnd-dictPtr, &hasZeroWeights); + + /* We only set the loaded table as valid if it contains all non-zero + * weights. Otherwise, we set it to check */ + if (!hasZeroWeights) + bs->entropy.huf.repeatMode = HUF_repeat_valid; + + RETURN_ERROR_IF(HUF_isError(hufHeaderSize), dictionary_corrupted, ""); + RETURN_ERROR_IF(maxSymbolValue < 255, dictionary_corrupted, ""); + dictPtr += hufHeaderSize; + } + + { unsigned offcodeLog; + size_t const offcodeHeaderSize = FSE_readNCount(offcodeNCount, &offcodeMaxValue, &offcodeLog, dictPtr, dictEnd-dictPtr); + RETURN_ERROR_IF(FSE_isError(offcodeHeaderSize), dictionary_corrupted, ""); + RETURN_ERROR_IF(offcodeLog > OffFSELog, dictionary_corrupted, ""); + /* fill all offset symbols to avoid garbage at end of table */ + RETURN_ERROR_IF(FSE_isError(FSE_buildCTable_wksp( + bs->entropy.fse.offcodeCTable, + offcodeNCount, MaxOff, offcodeLog, + workspace, HUF_WORKSPACE_SIZE)), + dictionary_corrupted, ""); + /* Defer checking offcodeMaxValue because we need to know the size of the dictionary content */ + dictPtr += offcodeHeaderSize; + } + + { short matchlengthNCount[MaxML+1]; + unsigned matchlengthMaxValue = MaxML, matchlengthLog; + size_t const matchlengthHeaderSize = FSE_readNCount(matchlengthNCount, &matchlengthMaxValue, &matchlengthLog, dictPtr, dictEnd-dictPtr); + RETURN_ERROR_IF(FSE_isError(matchlengthHeaderSize), dictionary_corrupted, ""); + RETURN_ERROR_IF(matchlengthLog > MLFSELog, dictionary_corrupted, ""); + RETURN_ERROR_IF(FSE_isError(FSE_buildCTable_wksp( + bs->entropy.fse.matchlengthCTable, + matchlengthNCount, matchlengthMaxValue, matchlengthLog, + workspace, HUF_WORKSPACE_SIZE)), + dictionary_corrupted, ""); + bs->entropy.fse.matchlength_repeatMode = ZSTD_dictNCountRepeat(matchlengthNCount, matchlengthMaxValue, MaxML); + dictPtr += matchlengthHeaderSize; + } + + { short litlengthNCount[MaxLL+1]; + unsigned litlengthMaxValue = MaxLL, litlengthLog; + size_t const litlengthHeaderSize = FSE_readNCount(litlengthNCount, &litlengthMaxValue, &litlengthLog, dictPtr, dictEnd-dictPtr); + RETURN_ERROR_IF(FSE_isError(litlengthHeaderSize), dictionary_corrupted, ""); + RETURN_ERROR_IF(litlengthLog > LLFSELog, dictionary_corrupted, ""); + RETURN_ERROR_IF(FSE_isError(FSE_buildCTable_wksp( + bs->entropy.fse.litlengthCTable, + litlengthNCount, litlengthMaxValue, litlengthLog, + workspace, HUF_WORKSPACE_SIZE)), + dictionary_corrupted, ""); + bs->entropy.fse.litlength_repeatMode = ZSTD_dictNCountRepeat(litlengthNCount, litlengthMaxValue, MaxLL); + dictPtr += litlengthHeaderSize; + } + + RETURN_ERROR_IF(dictPtr+12 > dictEnd, dictionary_corrupted, ""); + bs->rep[0] = MEM_readLE32(dictPtr+0); + bs->rep[1] = MEM_readLE32(dictPtr+4); + bs->rep[2] = MEM_readLE32(dictPtr+8); + dictPtr += 12; + + { size_t const dictContentSize = (size_t)(dictEnd - dictPtr); + U32 offcodeMax = MaxOff; + if (dictContentSize <= ((U32)-1) - 128 KB) { + U32 const maxOffset = (U32)dictContentSize + 128 KB; /* The maximum offset that must be supported */ + offcodeMax = ZSTD_highbit32(maxOffset); /* Calculate minimum offset code required to represent maxOffset */ + } + /* All offset values <= dictContentSize + 128 KB must be representable for a valid table */ + bs->entropy.fse.offcode_repeatMode = ZSTD_dictNCountRepeat(offcodeNCount, offcodeMaxValue, MIN(offcodeMax, MaxOff)); + + /* All repCodes must be <= dictContentSize and != 0 */ + { U32 u; + for (u=0; u<3; u++) { + RETURN_ERROR_IF(bs->rep[u] == 0, dictionary_corrupted, ""); + RETURN_ERROR_IF(bs->rep[u] > dictContentSize, dictionary_corrupted, ""); + } } } + + return dictPtr - (const BYTE*)dict; +} + +/* Dictionary format : + * See : + * https://github.com/facebook/zstd/blob/release/doc/zstd_compression_format.md#dictionary-format + */ +/*! ZSTD_loadZstdDictionary() : + * @return : dictID, or an error code + * assumptions : magic number supposed already checked + * dictSize supposed >= 8 + */ +static size_t ZSTD_loadZstdDictionary(ZSTD_compressedBlockState_t* bs, + ZSTD_matchState_t* ms, + ZSTD_cwksp* ws, + ZSTD_CCtx_params const* params, + const void* dict, size_t dictSize, + ZSTD_dictTableLoadMethod_e dtlm, + void* workspace) +{ + const BYTE* dictPtr = (const BYTE*)dict; + const BYTE* const dictEnd = dictPtr + dictSize; + size_t dictID; + size_t eSize; + ZSTD_STATIC_ASSERT(HUF_WORKSPACE_SIZE >= (1<= 8); + assert(MEM_readLE32(dictPtr) == ZSTD_MAGIC_DICTIONARY); + + dictID = params->fParams.noDictIDFlag ? 0 : MEM_readLE32(dictPtr + 4 /* skip magic number */ ); + eSize = ZSTD_loadCEntropy(bs, workspace, dict, dictSize); + FORWARD_IF_ERROR(eSize, "ZSTD_loadCEntropy failed"); + dictPtr += eSize; + + { + size_t const dictContentSize = (size_t)(dictEnd - dictPtr); + FORWARD_IF_ERROR(ZSTD_loadDictionaryContent( + ms, NULL, ws, params, dictPtr, dictContentSize, dtlm), ""); + } + return dictID; +} + +/** ZSTD_compress_insertDictionary() : +* @return : dictID, or an error code */ +static size_t +ZSTD_compress_insertDictionary(ZSTD_compressedBlockState_t* bs, + ZSTD_matchState_t* ms, + ldmState_t* ls, + ZSTD_cwksp* ws, + const ZSTD_CCtx_params* params, + const void* dict, size_t dictSize, + ZSTD_dictContentType_e dictContentType, + ZSTD_dictTableLoadMethod_e dtlm, + void* workspace) +{ + DEBUGLOG(4, "ZSTD_compress_insertDictionary (dictSize=%u)", (U32)dictSize); + if ((dict==NULL) || (dictSize<8)) { + RETURN_ERROR_IF(dictContentType == ZSTD_dct_fullDict, dictionary_wrong, ""); + return 0; + } + + ZSTD_reset_compressedBlockState(bs); + + /* dict restricted modes */ + if (dictContentType == ZSTD_dct_rawContent) + return ZSTD_loadDictionaryContent(ms, ls, ws, params, dict, dictSize, dtlm); + + if (MEM_readLE32(dict) != ZSTD_MAGIC_DICTIONARY) { + if (dictContentType == ZSTD_dct_auto) { + DEBUGLOG(4, "raw content dictionary detected"); + return ZSTD_loadDictionaryContent( + ms, ls, ws, params, dict, dictSize, dtlm); + } + RETURN_ERROR_IF(dictContentType == ZSTD_dct_fullDict, dictionary_wrong, ""); + assert(0); /* impossible */ + } + + /* dict as full zstd dictionary */ + return ZSTD_loadZstdDictionary( + bs, ms, ws, params, dict, dictSize, dtlm, workspace); +} + +#define ZSTD_USE_CDICT_PARAMS_SRCSIZE_CUTOFF (128 KB) +#define ZSTD_USE_CDICT_PARAMS_DICTSIZE_MULTIPLIER (6ULL) + +/*! ZSTD_compressBegin_internal() : + * @return : 0, or an error code */ +static size_t ZSTD_compressBegin_internal(ZSTD_CCtx* cctx, + const void* dict, size_t dictSize, + ZSTD_dictContentType_e dictContentType, + ZSTD_dictTableLoadMethod_e dtlm, + const ZSTD_CDict* cdict, + const ZSTD_CCtx_params* params, U64 pledgedSrcSize, + ZSTD_buffered_policy_e zbuff) +{ + size_t const dictContentSize = cdict ? cdict->dictContentSize : dictSize; +#if ZSTD_TRACE + cctx->traceCtx = (ZSTD_trace_compress_begin != NULL) ? ZSTD_trace_compress_begin(cctx) : 0; +#endif + DEBUGLOG(4, "ZSTD_compressBegin_internal: wlog=%u", params->cParams.windowLog); + /* params are supposed to be fully validated at this point */ + assert(!ZSTD_isError(ZSTD_checkCParams(params->cParams))); + assert(!((dict) && (cdict))); /* either dict or cdict, not both */ + if ( (cdict) + && (cdict->dictContentSize > 0) + && ( pledgedSrcSize < ZSTD_USE_CDICT_PARAMS_SRCSIZE_CUTOFF + || pledgedSrcSize < cdict->dictContentSize * ZSTD_USE_CDICT_PARAMS_DICTSIZE_MULTIPLIER + || pledgedSrcSize == ZSTD_CONTENTSIZE_UNKNOWN + || cdict->compressionLevel == 0) + && (params->attachDictPref != ZSTD_dictForceLoad) ) { + return ZSTD_resetCCtx_usingCDict(cctx, cdict, params, pledgedSrcSize, zbuff); + } + + FORWARD_IF_ERROR( ZSTD_resetCCtx_internal(cctx, params, pledgedSrcSize, + dictContentSize, + ZSTDcrp_makeClean, zbuff) , ""); + { size_t const dictID = cdict ? + ZSTD_compress_insertDictionary( + cctx->blockState.prevCBlock, &cctx->blockState.matchState, + &cctx->ldmState, &cctx->workspace, &cctx->appliedParams, cdict->dictContent, + cdict->dictContentSize, cdict->dictContentType, dtlm, + cctx->entropyWorkspace) + : ZSTD_compress_insertDictionary( + cctx->blockState.prevCBlock, &cctx->blockState.matchState, + &cctx->ldmState, &cctx->workspace, &cctx->appliedParams, dict, dictSize, + dictContentType, dtlm, cctx->entropyWorkspace); + FORWARD_IF_ERROR(dictID, "ZSTD_compress_insertDictionary failed"); + assert(dictID <= UINT_MAX); + cctx->dictID = (U32)dictID; + cctx->dictContentSize = dictContentSize; + } + return 0; +} + +size_t ZSTD_compressBegin_advanced_internal(ZSTD_CCtx* cctx, + const void* dict, size_t dictSize, + ZSTD_dictContentType_e dictContentType, + ZSTD_dictTableLoadMethod_e dtlm, + const ZSTD_CDict* cdict, + const ZSTD_CCtx_params* params, + unsigned long long pledgedSrcSize) +{ + DEBUGLOG(4, "ZSTD_compressBegin_advanced_internal: wlog=%u", params->cParams.windowLog); + /* compression parameters verification and optimization */ + FORWARD_IF_ERROR( ZSTD_checkCParams(params->cParams) , ""); + return ZSTD_compressBegin_internal(cctx, + dict, dictSize, dictContentType, dtlm, + cdict, + params, pledgedSrcSize, + ZSTDb_not_buffered); +} + +/*! ZSTD_compressBegin_advanced() : +* @return : 0, or an error code */ +size_t ZSTD_compressBegin_advanced(ZSTD_CCtx* cctx, + const void* dict, size_t dictSize, + ZSTD_parameters params, unsigned long long pledgedSrcSize) +{ + ZSTD_CCtx_params cctxParams; + ZSTD_CCtxParams_init_internal(&cctxParams, ¶ms, ZSTD_NO_CLEVEL); + return ZSTD_compressBegin_advanced_internal(cctx, + dict, dictSize, ZSTD_dct_auto, ZSTD_dtlm_fast, + NULL /*cdict*/, + &cctxParams, pledgedSrcSize); +} + +size_t ZSTD_compressBegin_usingDict(ZSTD_CCtx* cctx, const void* dict, size_t dictSize, int compressionLevel) +{ + ZSTD_CCtx_params cctxParams; + { + ZSTD_parameters const params = ZSTD_getParams_internal(compressionLevel, ZSTD_CONTENTSIZE_UNKNOWN, dictSize, ZSTD_cpm_noAttachDict); + ZSTD_CCtxParams_init_internal(&cctxParams, ¶ms, (compressionLevel == 0) ? ZSTD_CLEVEL_DEFAULT : compressionLevel); + } + DEBUGLOG(4, "ZSTD_compressBegin_usingDict (dictSize=%u)", (unsigned)dictSize); + return ZSTD_compressBegin_internal(cctx, dict, dictSize, ZSTD_dct_auto, ZSTD_dtlm_fast, NULL, + &cctxParams, ZSTD_CONTENTSIZE_UNKNOWN, ZSTDb_not_buffered); +} + +size_t ZSTD_compressBegin(ZSTD_CCtx* cctx, int compressionLevel) +{ + return ZSTD_compressBegin_usingDict(cctx, NULL, 0, compressionLevel); +} + + +/*! ZSTD_writeEpilogue() : +* Ends a frame. +* @return : nb of bytes written into dst (or an error code) */ +static size_t ZSTD_writeEpilogue(ZSTD_CCtx* cctx, void* dst, size_t dstCapacity) +{ + BYTE* const ostart = (BYTE*)dst; + BYTE* op = ostart; + size_t fhSize = 0; + + DEBUGLOG(4, "ZSTD_writeEpilogue"); + RETURN_ERROR_IF(cctx->stage == ZSTDcs_created, stage_wrong, "init missing"); + + /* special case : empty frame */ + if (cctx->stage == ZSTDcs_init) { + fhSize = ZSTD_writeFrameHeader(dst, dstCapacity, &cctx->appliedParams, 0, 0); + FORWARD_IF_ERROR(fhSize, "ZSTD_writeFrameHeader failed"); + dstCapacity -= fhSize; + op += fhSize; + cctx->stage = ZSTDcs_ongoing; + } + + if (cctx->stage != ZSTDcs_ending) { + /* write one last empty block, make it the "last" block */ + U32 const cBlockHeader24 = 1 /* last block */ + (((U32)bt_raw)<<1) + 0; + RETURN_ERROR_IF(dstCapacity<4, dstSize_tooSmall, "no room for epilogue"); + MEM_writeLE32(op, cBlockHeader24); + op += ZSTD_blockHeaderSize; + dstCapacity -= ZSTD_blockHeaderSize; + } + + if (cctx->appliedParams.fParams.checksumFlag) { + U32 const checksum = (U32) XXH64_digest(&cctx->xxhState); + RETURN_ERROR_IF(dstCapacity<4, dstSize_tooSmall, "no room for checksum"); + DEBUGLOG(4, "ZSTD_writeEpilogue: write checksum : %08X", (unsigned)checksum); + MEM_writeLE32(op, checksum); + op += 4; + } + + cctx->stage = ZSTDcs_created; /* return to "created but no init" status */ + return op-ostart; +} + +void ZSTD_CCtx_trace(ZSTD_CCtx* cctx, size_t extraCSize) +{ +#if ZSTD_TRACE + if (cctx->traceCtx && ZSTD_trace_compress_end != NULL) { + int const streaming = cctx->inBuffSize > 0 || cctx->outBuffSize > 0 || cctx->appliedParams.nbWorkers > 0; + ZSTD_Trace trace; + ZSTD_memset(&trace, 0, sizeof(trace)); + trace.version = ZSTD_VERSION_NUMBER; + trace.streaming = streaming; + trace.dictionaryID = cctx->dictID; + trace.dictionarySize = cctx->dictContentSize; + trace.uncompressedSize = cctx->consumedSrcSize; + trace.compressedSize = cctx->producedCSize + extraCSize; + trace.params = &cctx->appliedParams; + trace.cctx = cctx; + ZSTD_trace_compress_end(cctx->traceCtx, &trace); + } + cctx->traceCtx = 0; +#else + (void)cctx; + (void)extraCSize; +#endif +} + +size_t ZSTD_compressEnd (ZSTD_CCtx* cctx, + void* dst, size_t dstCapacity, + const void* src, size_t srcSize) +{ + size_t endResult; + size_t const cSize = ZSTD_compressContinue_internal(cctx, + dst, dstCapacity, src, srcSize, + 1 /* frame mode */, 1 /* last chunk */); + FORWARD_IF_ERROR(cSize, "ZSTD_compressContinue_internal failed"); + endResult = ZSTD_writeEpilogue(cctx, (char*)dst + cSize, dstCapacity-cSize); + FORWARD_IF_ERROR(endResult, "ZSTD_writeEpilogue failed"); + assert(!(cctx->appliedParams.fParams.contentSizeFlag && cctx->pledgedSrcSizePlusOne == 0)); + if (cctx->pledgedSrcSizePlusOne != 0) { /* control src size */ + ZSTD_STATIC_ASSERT(ZSTD_CONTENTSIZE_UNKNOWN == (unsigned long long)-1); + DEBUGLOG(4, "end of frame : controlling src size"); + RETURN_ERROR_IF( + cctx->pledgedSrcSizePlusOne != cctx->consumedSrcSize+1, + srcSize_wrong, + "error : pledgedSrcSize = %u, while realSrcSize = %u", + (unsigned)cctx->pledgedSrcSizePlusOne-1, + (unsigned)cctx->consumedSrcSize); + } + ZSTD_CCtx_trace(cctx, endResult); + return cSize + endResult; +} + +size_t ZSTD_compress_advanced (ZSTD_CCtx* cctx, + void* dst, size_t dstCapacity, + const void* src, size_t srcSize, + const void* dict,size_t dictSize, + ZSTD_parameters params) +{ + DEBUGLOG(4, "ZSTD_compress_advanced"); + FORWARD_IF_ERROR(ZSTD_checkCParams(params.cParams), ""); + ZSTD_CCtxParams_init_internal(&cctx->simpleApiParams, ¶ms, ZSTD_NO_CLEVEL); + return ZSTD_compress_advanced_internal(cctx, + dst, dstCapacity, + src, srcSize, + dict, dictSize, + &cctx->simpleApiParams); +} + +/* Internal */ +size_t ZSTD_compress_advanced_internal( + ZSTD_CCtx* cctx, + void* dst, size_t dstCapacity, + const void* src, size_t srcSize, + const void* dict,size_t dictSize, + const ZSTD_CCtx_params* params) +{ + DEBUGLOG(4, "ZSTD_compress_advanced_internal (srcSize:%u)", (unsigned)srcSize); + FORWARD_IF_ERROR( ZSTD_compressBegin_internal(cctx, + dict, dictSize, ZSTD_dct_auto, ZSTD_dtlm_fast, NULL, + params, srcSize, ZSTDb_not_buffered) , ""); + return ZSTD_compressEnd(cctx, dst, dstCapacity, src, srcSize); +} + +size_t ZSTD_compress_usingDict(ZSTD_CCtx* cctx, + void* dst, size_t dstCapacity, + const void* src, size_t srcSize, + const void* dict, size_t dictSize, + int compressionLevel) +{ + { + ZSTD_parameters const params = ZSTD_getParams_internal(compressionLevel, srcSize, dict ? dictSize : 0, ZSTD_cpm_noAttachDict); + assert(params.fParams.contentSizeFlag == 1); + ZSTD_CCtxParams_init_internal(&cctx->simpleApiParams, ¶ms, (compressionLevel == 0) ? ZSTD_CLEVEL_DEFAULT: compressionLevel); + } + DEBUGLOG(4, "ZSTD_compress_usingDict (srcSize=%u)", (unsigned)srcSize); + return ZSTD_compress_advanced_internal(cctx, dst, dstCapacity, src, srcSize, dict, dictSize, &cctx->simpleApiParams); +} + +size_t ZSTD_compressCCtx(ZSTD_CCtx* cctx, + void* dst, size_t dstCapacity, + const void* src, size_t srcSize, + int compressionLevel) +{ + DEBUGLOG(4, "ZSTD_compressCCtx (srcSize=%u)", (unsigned)srcSize); + assert(cctx != NULL); + return ZSTD_compress_usingDict(cctx, dst, dstCapacity, src, srcSize, NULL, 0, compressionLevel); +} + +size_t ZSTD_compress(void* dst, size_t dstCapacity, + const void* src, size_t srcSize, + int compressionLevel) +{ + size_t result; +#if ZSTD_COMPRESS_HEAPMODE + ZSTD_CCtx* cctx = ZSTD_createCCtx(); + RETURN_ERROR_IF(!cctx, memory_allocation, "ZSTD_createCCtx failed"); + result = ZSTD_compressCCtx(cctx, dst, dstCapacity, src, srcSize, compressionLevel); + ZSTD_freeCCtx(cctx); +#else + ZSTD_CCtx ctxBody; + ZSTD_initCCtx(&ctxBody, ZSTD_defaultCMem); + result = ZSTD_compressCCtx(&ctxBody, dst, dstCapacity, src, srcSize, compressionLevel); + ZSTD_freeCCtxContent(&ctxBody); /* can't free ctxBody itself, as it's on stack; free only heap content */ +#endif + return result; +} + + +/* ===== Dictionary API ===== */ + +/*! ZSTD_estimateCDictSize_advanced() : + * Estimate amount of memory that will be needed to create a dictionary with following arguments */ +size_t ZSTD_estimateCDictSize_advanced( + size_t dictSize, ZSTD_compressionParameters cParams, + ZSTD_dictLoadMethod_e dictLoadMethod) +{ + DEBUGLOG(5, "sizeof(ZSTD_CDict) : %u", (unsigned)sizeof(ZSTD_CDict)); + return ZSTD_cwksp_alloc_size(sizeof(ZSTD_CDict)) + + ZSTD_cwksp_alloc_size(HUF_WORKSPACE_SIZE) + /* enableDedicatedDictSearch == 1 ensures that CDict estimation will not be too small + * in case we are using DDS with row-hash. */ + + ZSTD_sizeof_matchState(&cParams, ZSTD_resolveRowMatchFinderMode(ZSTD_urm_auto, &cParams), + /* enableDedicatedDictSearch */ 1, /* forCCtx */ 0) + + (dictLoadMethod == ZSTD_dlm_byRef ? 0 + : ZSTD_cwksp_alloc_size(ZSTD_cwksp_align(dictSize, sizeof(void *)))); +} + +size_t ZSTD_estimateCDictSize(size_t dictSize, int compressionLevel) +{ + ZSTD_compressionParameters const cParams = ZSTD_getCParams_internal(compressionLevel, ZSTD_CONTENTSIZE_UNKNOWN, dictSize, ZSTD_cpm_createCDict); + return ZSTD_estimateCDictSize_advanced(dictSize, cParams, ZSTD_dlm_byCopy); +} + +size_t ZSTD_sizeof_CDict(const ZSTD_CDict* cdict) +{ + if (cdict==NULL) return 0; /* support sizeof on NULL */ + DEBUGLOG(5, "sizeof(*cdict) : %u", (unsigned)sizeof(*cdict)); + /* cdict may be in the workspace */ + return (cdict->workspace.workspace == cdict ? 0 : sizeof(*cdict)) + + ZSTD_cwksp_sizeof(&cdict->workspace); +} + +static size_t ZSTD_initCDict_internal( + ZSTD_CDict* cdict, + const void* dictBuffer, size_t dictSize, + ZSTD_dictLoadMethod_e dictLoadMethod, + ZSTD_dictContentType_e dictContentType, + ZSTD_CCtx_params params) +{ + DEBUGLOG(3, "ZSTD_initCDict_internal (dictContentType:%u)", (unsigned)dictContentType); + assert(!ZSTD_checkCParams(params.cParams)); + cdict->matchState.cParams = params.cParams; + cdict->matchState.dedicatedDictSearch = params.enableDedicatedDictSearch; + if ((dictLoadMethod == ZSTD_dlm_byRef) || (!dictBuffer) || (!dictSize)) { + cdict->dictContent = dictBuffer; + } else { + void *internalBuffer = ZSTD_cwksp_reserve_object(&cdict->workspace, ZSTD_cwksp_align(dictSize, sizeof(void*))); + RETURN_ERROR_IF(!internalBuffer, memory_allocation, "NULL pointer!"); + cdict->dictContent = internalBuffer; + ZSTD_memcpy(internalBuffer, dictBuffer, dictSize); + } + cdict->dictContentSize = dictSize; + cdict->dictContentType = dictContentType; + + cdict->entropyWorkspace = (U32*)ZSTD_cwksp_reserve_object(&cdict->workspace, HUF_WORKSPACE_SIZE); + + + /* Reset the state to no dictionary */ + ZSTD_reset_compressedBlockState(&cdict->cBlockState); + FORWARD_IF_ERROR(ZSTD_reset_matchState( + &cdict->matchState, + &cdict->workspace, + ¶ms.cParams, + params.useRowMatchFinder, + ZSTDcrp_makeClean, + ZSTDirp_reset, + ZSTD_resetTarget_CDict), ""); + /* (Maybe) load the dictionary + * Skips loading the dictionary if it is < 8 bytes. + */ + { params.compressionLevel = ZSTD_CLEVEL_DEFAULT; + params.fParams.contentSizeFlag = 1; + { size_t const dictID = ZSTD_compress_insertDictionary( + &cdict->cBlockState, &cdict->matchState, NULL, &cdict->workspace, + ¶ms, cdict->dictContent, cdict->dictContentSize, + dictContentType, ZSTD_dtlm_full, cdict->entropyWorkspace); + FORWARD_IF_ERROR(dictID, "ZSTD_compress_insertDictionary failed"); + assert(dictID <= (size_t)(U32)-1); + cdict->dictID = (U32)dictID; + } + } + + return 0; +} + +static ZSTD_CDict* ZSTD_createCDict_advanced_internal(size_t dictSize, + ZSTD_dictLoadMethod_e dictLoadMethod, + ZSTD_compressionParameters cParams, + ZSTD_useRowMatchFinderMode_e useRowMatchFinder, + U32 enableDedicatedDictSearch, + ZSTD_customMem customMem) +{ + if ((!customMem.customAlloc) ^ (!customMem.customFree)) return NULL; + + { size_t const workspaceSize = + ZSTD_cwksp_alloc_size(sizeof(ZSTD_CDict)) + + ZSTD_cwksp_alloc_size(HUF_WORKSPACE_SIZE) + + ZSTD_sizeof_matchState(&cParams, useRowMatchFinder, enableDedicatedDictSearch, /* forCCtx */ 0) + + (dictLoadMethod == ZSTD_dlm_byRef ? 0 + : ZSTD_cwksp_alloc_size(ZSTD_cwksp_align(dictSize, sizeof(void*)))); + void* const workspace = ZSTD_customMalloc(workspaceSize, customMem); + ZSTD_cwksp ws; + ZSTD_CDict* cdict; + + if (!workspace) { + ZSTD_customFree(workspace, customMem); + return NULL; + } + + ZSTD_cwksp_init(&ws, workspace, workspaceSize, ZSTD_cwksp_dynamic_alloc); + + cdict = (ZSTD_CDict*)ZSTD_cwksp_reserve_object(&ws, sizeof(ZSTD_CDict)); + assert(cdict != NULL); + ZSTD_cwksp_move(&cdict->workspace, &ws); + cdict->customMem = customMem; + cdict->compressionLevel = ZSTD_NO_CLEVEL; /* signals advanced API usage */ + cdict->useRowMatchFinder = useRowMatchFinder; + return cdict; + } +} + +ZSTD_CDict* ZSTD_createCDict_advanced(const void* dictBuffer, size_t dictSize, + ZSTD_dictLoadMethod_e dictLoadMethod, + ZSTD_dictContentType_e dictContentType, + ZSTD_compressionParameters cParams, + ZSTD_customMem customMem) +{ + ZSTD_CCtx_params cctxParams; + ZSTD_memset(&cctxParams, 0, sizeof(cctxParams)); + ZSTD_CCtxParams_init(&cctxParams, 0); + cctxParams.cParams = cParams; + cctxParams.customMem = customMem; + return ZSTD_createCDict_advanced2( + dictBuffer, dictSize, + dictLoadMethod, dictContentType, + &cctxParams, customMem); +} + +ZSTDLIB_API ZSTD_CDict* ZSTD_createCDict_advanced2( + const void* dict, size_t dictSize, + ZSTD_dictLoadMethod_e dictLoadMethod, + ZSTD_dictContentType_e dictContentType, + const ZSTD_CCtx_params* originalCctxParams, + ZSTD_customMem customMem) +{ + ZSTD_CCtx_params cctxParams = *originalCctxParams; + ZSTD_compressionParameters cParams; + ZSTD_CDict* cdict; + + DEBUGLOG(3, "ZSTD_createCDict_advanced2, mode %u", (unsigned)dictContentType); + if (!customMem.customAlloc ^ !customMem.customFree) return NULL; + + if (cctxParams.enableDedicatedDictSearch) { + cParams = ZSTD_dedicatedDictSearch_getCParams( + cctxParams.compressionLevel, dictSize); + ZSTD_overrideCParams(&cParams, &cctxParams.cParams); + } else { + cParams = ZSTD_getCParamsFromCCtxParams( + &cctxParams, ZSTD_CONTENTSIZE_UNKNOWN, dictSize, ZSTD_cpm_createCDict); + } + + if (!ZSTD_dedicatedDictSearch_isSupported(&cParams)) { + /* Fall back to non-DDSS params */ + cctxParams.enableDedicatedDictSearch = 0; + cParams = ZSTD_getCParamsFromCCtxParams( + &cctxParams, ZSTD_CONTENTSIZE_UNKNOWN, dictSize, ZSTD_cpm_createCDict); + } + + DEBUGLOG(3, "ZSTD_createCDict_advanced2: DDS: %u", cctxParams.enableDedicatedDictSearch); + cctxParams.cParams = cParams; + cctxParams.useRowMatchFinder = ZSTD_resolveRowMatchFinderMode(cctxParams.useRowMatchFinder, &cParams); + + cdict = ZSTD_createCDict_advanced_internal(dictSize, + dictLoadMethod, cctxParams.cParams, + cctxParams.useRowMatchFinder, cctxParams.enableDedicatedDictSearch, + customMem); + + if (ZSTD_isError( ZSTD_initCDict_internal(cdict, + dict, dictSize, + dictLoadMethod, dictContentType, + cctxParams) )) { + ZSTD_freeCDict(cdict); + return NULL; + } + + return cdict; +} + +ZSTD_CDict* ZSTD_createCDict(const void* dict, size_t dictSize, int compressionLevel) +{ + ZSTD_compressionParameters cParams = ZSTD_getCParams_internal(compressionLevel, ZSTD_CONTENTSIZE_UNKNOWN, dictSize, ZSTD_cpm_createCDict); + ZSTD_CDict* const cdict = ZSTD_createCDict_advanced(dict, dictSize, + ZSTD_dlm_byCopy, ZSTD_dct_auto, + cParams, ZSTD_defaultCMem); + if (cdict) + cdict->compressionLevel = (compressionLevel == 0) ? ZSTD_CLEVEL_DEFAULT : compressionLevel; + return cdict; +} + +ZSTD_CDict* ZSTD_createCDict_byReference(const void* dict, size_t dictSize, int compressionLevel) +{ + ZSTD_compressionParameters cParams = ZSTD_getCParams_internal(compressionLevel, ZSTD_CONTENTSIZE_UNKNOWN, dictSize, ZSTD_cpm_createCDict); + ZSTD_CDict* const cdict = ZSTD_createCDict_advanced(dict, dictSize, + ZSTD_dlm_byRef, ZSTD_dct_auto, + cParams, ZSTD_defaultCMem); + if (cdict) + cdict->compressionLevel = (compressionLevel == 0) ? ZSTD_CLEVEL_DEFAULT : compressionLevel; + return cdict; +} + +size_t ZSTD_freeCDict(ZSTD_CDict* cdict) +{ + if (cdict==NULL) return 0; /* support free on NULL */ + { ZSTD_customMem const cMem = cdict->customMem; + int cdictInWorkspace = ZSTD_cwksp_owns_buffer(&cdict->workspace, cdict); + ZSTD_cwksp_free(&cdict->workspace, cMem); + if (!cdictInWorkspace) { + ZSTD_customFree(cdict, cMem); + } + return 0; + } +} + +/*! ZSTD_initStaticCDict_advanced() : + * Generate a digested dictionary in provided memory area. + * workspace: The memory area to emplace the dictionary into. + * Provided pointer must 8-bytes aligned. + * It must outlive dictionary usage. + * workspaceSize: Use ZSTD_estimateCDictSize() + * to determine how large workspace must be. + * cParams : use ZSTD_getCParams() to transform a compression level + * into its relevants cParams. + * @return : pointer to ZSTD_CDict*, or NULL if error (size too small) + * Note : there is no corresponding "free" function. + * Since workspace was allocated externally, it must be freed externally. + */ +const ZSTD_CDict* ZSTD_initStaticCDict( + void* workspace, size_t workspaceSize, + const void* dict, size_t dictSize, + ZSTD_dictLoadMethod_e dictLoadMethod, + ZSTD_dictContentType_e dictContentType, + ZSTD_compressionParameters cParams) +{ + ZSTD_useRowMatchFinderMode_e const useRowMatchFinder = ZSTD_resolveRowMatchFinderMode(ZSTD_urm_auto, &cParams); + /* enableDedicatedDictSearch == 1 ensures matchstate is not too small in case this CDict will be used for DDS + row hash */ + size_t const matchStateSize = ZSTD_sizeof_matchState(&cParams, useRowMatchFinder, /* enableDedicatedDictSearch */ 1, /* forCCtx */ 0); + size_t const neededSize = ZSTD_cwksp_alloc_size(sizeof(ZSTD_CDict)) + + (dictLoadMethod == ZSTD_dlm_byRef ? 0 + : ZSTD_cwksp_alloc_size(ZSTD_cwksp_align(dictSize, sizeof(void*)))) + + ZSTD_cwksp_alloc_size(HUF_WORKSPACE_SIZE) + + matchStateSize; + ZSTD_CDict* cdict; + ZSTD_CCtx_params params; + + if ((size_t)workspace & 7) return NULL; /* 8-aligned */ + + { + ZSTD_cwksp ws; + ZSTD_cwksp_init(&ws, workspace, workspaceSize, ZSTD_cwksp_static_alloc); + cdict = (ZSTD_CDict*)ZSTD_cwksp_reserve_object(&ws, sizeof(ZSTD_CDict)); + if (cdict == NULL) return NULL; + ZSTD_cwksp_move(&cdict->workspace, &ws); + } + + DEBUGLOG(4, "(workspaceSize < neededSize) : (%u < %u) => %u", + (unsigned)workspaceSize, (unsigned)neededSize, (unsigned)(workspaceSize < neededSize)); + if (workspaceSize < neededSize) return NULL; + + ZSTD_CCtxParams_init(¶ms, 0); + params.cParams = cParams; + params.useRowMatchFinder = useRowMatchFinder; + cdict->useRowMatchFinder = useRowMatchFinder; + + if (ZSTD_isError( ZSTD_initCDict_internal(cdict, + dict, dictSize, + dictLoadMethod, dictContentType, + params) )) + return NULL; + + return cdict; +} + +ZSTD_compressionParameters ZSTD_getCParamsFromCDict(const ZSTD_CDict* cdict) +{ + assert(cdict != NULL); + return cdict->matchState.cParams; +} + +/*! ZSTD_getDictID_fromCDict() : + * Provides the dictID of the dictionary loaded into `cdict`. + * If @return == 0, the dictionary is not conformant to Zstandard specification, or empty. + * Non-conformant dictionaries can still be loaded, but as content-only dictionaries. */ +unsigned ZSTD_getDictID_fromCDict(const ZSTD_CDict* cdict) +{ + if (cdict==NULL) return 0; + return cdict->dictID; +} + +/* ZSTD_compressBegin_usingCDict_internal() : + * Implementation of various ZSTD_compressBegin_usingCDict* functions. + */ +static size_t ZSTD_compressBegin_usingCDict_internal( + ZSTD_CCtx* const cctx, const ZSTD_CDict* const cdict, + ZSTD_frameParameters const fParams, unsigned long long const pledgedSrcSize) +{ + ZSTD_CCtx_params cctxParams; + DEBUGLOG(4, "ZSTD_compressBegin_usingCDict_internal"); + RETURN_ERROR_IF(cdict==NULL, dictionary_wrong, "NULL pointer!"); + /* Initialize the cctxParams from the cdict */ + { + ZSTD_parameters params; + params.fParams = fParams; + params.cParams = ( pledgedSrcSize < ZSTD_USE_CDICT_PARAMS_SRCSIZE_CUTOFF + || pledgedSrcSize < cdict->dictContentSize * ZSTD_USE_CDICT_PARAMS_DICTSIZE_MULTIPLIER + || pledgedSrcSize == ZSTD_CONTENTSIZE_UNKNOWN + || cdict->compressionLevel == 0 ) ? + ZSTD_getCParamsFromCDict(cdict) + : ZSTD_getCParams(cdict->compressionLevel, + pledgedSrcSize, + cdict->dictContentSize); + ZSTD_CCtxParams_init_internal(&cctxParams, ¶ms, cdict->compressionLevel); + } + /* Increase window log to fit the entire dictionary and source if the + * source size is known. Limit the increase to 19, which is the + * window log for compression level 1 with the largest source size. + */ + if (pledgedSrcSize != ZSTD_CONTENTSIZE_UNKNOWN) { + U32 const limitedSrcSize = (U32)MIN(pledgedSrcSize, 1U << 19); + U32 const limitedSrcLog = limitedSrcSize > 1 ? ZSTD_highbit32(limitedSrcSize - 1) + 1 : 1; + cctxParams.cParams.windowLog = MAX(cctxParams.cParams.windowLog, limitedSrcLog); + } + return ZSTD_compressBegin_internal(cctx, + NULL, 0, ZSTD_dct_auto, ZSTD_dtlm_fast, + cdict, + &cctxParams, pledgedSrcSize, + ZSTDb_not_buffered); +} + + +/* ZSTD_compressBegin_usingCDict_advanced() : + * This function is DEPRECATED. + * cdict must be != NULL */ +size_t ZSTD_compressBegin_usingCDict_advanced( + ZSTD_CCtx* const cctx, const ZSTD_CDict* const cdict, + ZSTD_frameParameters const fParams, unsigned long long const pledgedSrcSize) +{ + return ZSTD_compressBegin_usingCDict_internal(cctx, cdict, fParams, pledgedSrcSize); +} + +/* ZSTD_compressBegin_usingCDict() : + * cdict must be != NULL */ +size_t ZSTD_compressBegin_usingCDict(ZSTD_CCtx* cctx, const ZSTD_CDict* cdict) +{ + ZSTD_frameParameters const fParams = { 0 /*content*/, 0 /*checksum*/, 0 /*noDictID*/ }; + return ZSTD_compressBegin_usingCDict_internal(cctx, cdict, fParams, ZSTD_CONTENTSIZE_UNKNOWN); +} + +/*! ZSTD_compress_usingCDict_internal(): + * Implementation of various ZSTD_compress_usingCDict* functions. + */ +static size_t ZSTD_compress_usingCDict_internal(ZSTD_CCtx* cctx, + void* dst, size_t dstCapacity, + const void* src, size_t srcSize, + const ZSTD_CDict* cdict, ZSTD_frameParameters fParams) +{ + FORWARD_IF_ERROR(ZSTD_compressBegin_usingCDict_internal(cctx, cdict, fParams, srcSize), ""); /* will check if cdict != NULL */ + return ZSTD_compressEnd(cctx, dst, dstCapacity, src, srcSize); +} + +/*! ZSTD_compress_usingCDict_advanced(): + * This function is DEPRECATED. + */ +size_t ZSTD_compress_usingCDict_advanced(ZSTD_CCtx* cctx, + void* dst, size_t dstCapacity, + const void* src, size_t srcSize, + const ZSTD_CDict* cdict, ZSTD_frameParameters fParams) +{ + return ZSTD_compress_usingCDict_internal(cctx, dst, dstCapacity, src, srcSize, cdict, fParams); +} + +/*! ZSTD_compress_usingCDict() : + * Compression using a digested Dictionary. + * Faster startup than ZSTD_compress_usingDict(), recommended when same dictionary is used multiple times. + * Note that compression parameters are decided at CDict creation time + * while frame parameters are hardcoded */ +size_t ZSTD_compress_usingCDict(ZSTD_CCtx* cctx, + void* dst, size_t dstCapacity, + const void* src, size_t srcSize, + const ZSTD_CDict* cdict) +{ + ZSTD_frameParameters const fParams = { 1 /*content*/, 0 /*checksum*/, 0 /*noDictID*/ }; + return ZSTD_compress_usingCDict_internal(cctx, dst, dstCapacity, src, srcSize, cdict, fParams); +} + + + +/* ****************************************************************** +* Streaming +********************************************************************/ + +ZSTD_CStream* ZSTD_createCStream(void) +{ + DEBUGLOG(3, "ZSTD_createCStream"); + return ZSTD_createCStream_advanced(ZSTD_defaultCMem); +} + +ZSTD_CStream* ZSTD_initStaticCStream(void *workspace, size_t workspaceSize) +{ + return ZSTD_initStaticCCtx(workspace, workspaceSize); +} + +ZSTD_CStream* ZSTD_createCStream_advanced(ZSTD_customMem customMem) +{ /* CStream and CCtx are now same object */ + return ZSTD_createCCtx_advanced(customMem); +} + +size_t ZSTD_freeCStream(ZSTD_CStream* zcs) +{ + return ZSTD_freeCCtx(zcs); /* same object */ +} + + + +/*====== Initialization ======*/ + +size_t ZSTD_CStreamInSize(void) { return ZSTD_BLOCKSIZE_MAX; } + +size_t ZSTD_CStreamOutSize(void) +{ + return ZSTD_compressBound(ZSTD_BLOCKSIZE_MAX) + ZSTD_blockHeaderSize + 4 /* 32-bits hash */ ; +} + +static ZSTD_cParamMode_e ZSTD_getCParamMode(ZSTD_CDict const* cdict, ZSTD_CCtx_params const* params, U64 pledgedSrcSize) +{ + if (cdict != NULL && ZSTD_shouldAttachDict(cdict, params, pledgedSrcSize)) + return ZSTD_cpm_attachDict; + else + return ZSTD_cpm_noAttachDict; +} + +/* ZSTD_resetCStream(): + * pledgedSrcSize == 0 means "unknown" */ +size_t ZSTD_resetCStream(ZSTD_CStream* zcs, unsigned long long pss) +{ + /* temporary : 0 interpreted as "unknown" during transition period. + * Users willing to specify "unknown" **must** use ZSTD_CONTENTSIZE_UNKNOWN. + * 0 will be interpreted as "empty" in the future. + */ + U64 const pledgedSrcSize = (pss==0) ? ZSTD_CONTENTSIZE_UNKNOWN : pss; + DEBUGLOG(4, "ZSTD_resetCStream: pledgedSrcSize = %u", (unsigned)pledgedSrcSize); + FORWARD_IF_ERROR( ZSTD_CCtx_reset(zcs, ZSTD_reset_session_only) , ""); + FORWARD_IF_ERROR( ZSTD_CCtx_setPledgedSrcSize(zcs, pledgedSrcSize) , ""); + return 0; +} + +/*! ZSTD_initCStream_internal() : + * Note : for lib/compress only. Used by zstdmt_compress.c. + * Assumption 1 : params are valid + * Assumption 2 : either dict, or cdict, is defined, not both */ +size_t ZSTD_initCStream_internal(ZSTD_CStream* zcs, + const void* dict, size_t dictSize, const ZSTD_CDict* cdict, + const ZSTD_CCtx_params* params, + unsigned long long pledgedSrcSize) +{ + DEBUGLOG(4, "ZSTD_initCStream_internal"); + FORWARD_IF_ERROR( ZSTD_CCtx_reset(zcs, ZSTD_reset_session_only) , ""); + FORWARD_IF_ERROR( ZSTD_CCtx_setPledgedSrcSize(zcs, pledgedSrcSize) , ""); + assert(!ZSTD_isError(ZSTD_checkCParams(params->cParams))); + zcs->requestedParams = *params; + assert(!((dict) && (cdict))); /* either dict or cdict, not both */ + if (dict) { + FORWARD_IF_ERROR( ZSTD_CCtx_loadDictionary(zcs, dict, dictSize) , ""); + } else { + /* Dictionary is cleared if !cdict */ + FORWARD_IF_ERROR( ZSTD_CCtx_refCDict(zcs, cdict) , ""); + } + return 0; +} + +/* ZSTD_initCStream_usingCDict_advanced() : + * same as ZSTD_initCStream_usingCDict(), with control over frame parameters */ +size_t ZSTD_initCStream_usingCDict_advanced(ZSTD_CStream* zcs, + const ZSTD_CDict* cdict, + ZSTD_frameParameters fParams, + unsigned long long pledgedSrcSize) +{ + DEBUGLOG(4, "ZSTD_initCStream_usingCDict_advanced"); + FORWARD_IF_ERROR( ZSTD_CCtx_reset(zcs, ZSTD_reset_session_only) , ""); + FORWARD_IF_ERROR( ZSTD_CCtx_setPledgedSrcSize(zcs, pledgedSrcSize) , ""); + zcs->requestedParams.fParams = fParams; + FORWARD_IF_ERROR( ZSTD_CCtx_refCDict(zcs, cdict) , ""); + return 0; +} + +/* note : cdict must outlive compression session */ +size_t ZSTD_initCStream_usingCDict(ZSTD_CStream* zcs, const ZSTD_CDict* cdict) +{ + DEBUGLOG(4, "ZSTD_initCStream_usingCDict"); + FORWARD_IF_ERROR( ZSTD_CCtx_reset(zcs, ZSTD_reset_session_only) , ""); + FORWARD_IF_ERROR( ZSTD_CCtx_refCDict(zcs, cdict) , ""); + return 0; +} + + +/* ZSTD_initCStream_advanced() : + * pledgedSrcSize must be exact. + * if srcSize is not known at init time, use value ZSTD_CONTENTSIZE_UNKNOWN. + * dict is loaded with default parameters ZSTD_dct_auto and ZSTD_dlm_byCopy. */ +size_t ZSTD_initCStream_advanced(ZSTD_CStream* zcs, + const void* dict, size_t dictSize, + ZSTD_parameters params, unsigned long long pss) +{ + /* for compatibility with older programs relying on this behavior. + * Users should now specify ZSTD_CONTENTSIZE_UNKNOWN. + * This line will be removed in the future. + */ + U64 const pledgedSrcSize = (pss==0 && params.fParams.contentSizeFlag==0) ? ZSTD_CONTENTSIZE_UNKNOWN : pss; + DEBUGLOG(4, "ZSTD_initCStream_advanced"); + FORWARD_IF_ERROR( ZSTD_CCtx_reset(zcs, ZSTD_reset_session_only) , ""); + FORWARD_IF_ERROR( ZSTD_CCtx_setPledgedSrcSize(zcs, pledgedSrcSize) , ""); + FORWARD_IF_ERROR( ZSTD_checkCParams(params.cParams) , ""); + ZSTD_CCtxParams_setZstdParams(&zcs->requestedParams, ¶ms); + FORWARD_IF_ERROR( ZSTD_CCtx_loadDictionary(zcs, dict, dictSize) , ""); + return 0; +} + +size_t ZSTD_initCStream_usingDict(ZSTD_CStream* zcs, const void* dict, size_t dictSize, int compressionLevel) +{ + DEBUGLOG(4, "ZSTD_initCStream_usingDict"); + FORWARD_IF_ERROR( ZSTD_CCtx_reset(zcs, ZSTD_reset_session_only) , ""); + FORWARD_IF_ERROR( ZSTD_CCtx_setParameter(zcs, ZSTD_c_compressionLevel, compressionLevel) , ""); + FORWARD_IF_ERROR( ZSTD_CCtx_loadDictionary(zcs, dict, dictSize) , ""); + return 0; +} + +size_t ZSTD_initCStream_srcSize(ZSTD_CStream* zcs, int compressionLevel, unsigned long long pss) +{ + /* temporary : 0 interpreted as "unknown" during transition period. + * Users willing to specify "unknown" **must** use ZSTD_CONTENTSIZE_UNKNOWN. + * 0 will be interpreted as "empty" in the future. + */ + U64 const pledgedSrcSize = (pss==0) ? ZSTD_CONTENTSIZE_UNKNOWN : pss; + DEBUGLOG(4, "ZSTD_initCStream_srcSize"); + FORWARD_IF_ERROR( ZSTD_CCtx_reset(zcs, ZSTD_reset_session_only) , ""); + FORWARD_IF_ERROR( ZSTD_CCtx_refCDict(zcs, NULL) , ""); + FORWARD_IF_ERROR( ZSTD_CCtx_setParameter(zcs, ZSTD_c_compressionLevel, compressionLevel) , ""); + FORWARD_IF_ERROR( ZSTD_CCtx_setPledgedSrcSize(zcs, pledgedSrcSize) , ""); + return 0; +} + +size_t ZSTD_initCStream(ZSTD_CStream* zcs, int compressionLevel) +{ + DEBUGLOG(4, "ZSTD_initCStream"); + FORWARD_IF_ERROR( ZSTD_CCtx_reset(zcs, ZSTD_reset_session_only) , ""); + FORWARD_IF_ERROR( ZSTD_CCtx_refCDict(zcs, NULL) , ""); + FORWARD_IF_ERROR( ZSTD_CCtx_setParameter(zcs, ZSTD_c_compressionLevel, compressionLevel) , ""); + return 0; +} + +/*====== Compression ======*/ + +static size_t ZSTD_nextInputSizeHint(const ZSTD_CCtx* cctx) +{ + size_t hintInSize = cctx->inBuffTarget - cctx->inBuffPos; + if (hintInSize==0) hintInSize = cctx->blockSize; + return hintInSize; +} + +/** ZSTD_compressStream_generic(): + * internal function for all *compressStream*() variants + * non-static, because can be called from zstdmt_compress.c + * @return : hint size for next input */ +static size_t ZSTD_compressStream_generic(ZSTD_CStream* zcs, + ZSTD_outBuffer* output, + ZSTD_inBuffer* input, + ZSTD_EndDirective const flushMode) +{ + const char* const istart = (const char*)input->src; + const char* const iend = input->size != 0 ? istart + input->size : istart; + const char* ip = input->pos != 0 ? istart + input->pos : istart; + char* const ostart = (char*)output->dst; + char* const oend = output->size != 0 ? ostart + output->size : ostart; + char* op = output->pos != 0 ? ostart + output->pos : ostart; + U32 someMoreWork = 1; + + /* check expectations */ + DEBUGLOG(5, "ZSTD_compressStream_generic, flush=%u", (unsigned)flushMode); + if (zcs->appliedParams.inBufferMode == ZSTD_bm_buffered) { + assert(zcs->inBuff != NULL); + assert(zcs->inBuffSize > 0); + } + if (zcs->appliedParams.outBufferMode == ZSTD_bm_buffered) { + assert(zcs->outBuff != NULL); + assert(zcs->outBuffSize > 0); + } + assert(output->pos <= output->size); + assert(input->pos <= input->size); + assert((U32)flushMode <= (U32)ZSTD_e_end); + + while (someMoreWork) { + switch(zcs->streamStage) + { + case zcss_init: + RETURN_ERROR(init_missing, "call ZSTD_initCStream() first!"); + + case zcss_load: + if ( (flushMode == ZSTD_e_end) + && ( (size_t)(oend-op) >= ZSTD_compressBound(iend-ip) /* Enough output space */ + || zcs->appliedParams.outBufferMode == ZSTD_bm_stable) /* OR we are allowed to return dstSizeTooSmall */ + && (zcs->inBuffPos == 0) ) { + /* shortcut to compression pass directly into output buffer */ + size_t const cSize = ZSTD_compressEnd(zcs, + op, oend-op, ip, iend-ip); + DEBUGLOG(4, "ZSTD_compressEnd : cSize=%u", (unsigned)cSize); + FORWARD_IF_ERROR(cSize, "ZSTD_compressEnd failed"); + ip = iend; + op += cSize; + zcs->frameEnded = 1; + ZSTD_CCtx_reset(zcs, ZSTD_reset_session_only); + someMoreWork = 0; break; + } + /* complete loading into inBuffer in buffered mode */ + if (zcs->appliedParams.inBufferMode == ZSTD_bm_buffered) { + size_t const toLoad = zcs->inBuffTarget - zcs->inBuffPos; + size_t const loaded = ZSTD_limitCopy( + zcs->inBuff + zcs->inBuffPos, toLoad, + ip, iend-ip); + zcs->inBuffPos += loaded; + if (loaded != 0) + ip += loaded; + if ( (flushMode == ZSTD_e_continue) + && (zcs->inBuffPos < zcs->inBuffTarget) ) { + /* not enough input to fill full block : stop here */ + someMoreWork = 0; break; + } + if ( (flushMode == ZSTD_e_flush) + && (zcs->inBuffPos == zcs->inToCompress) ) { + /* empty */ + someMoreWork = 0; break; + } + } + /* compress current block (note : this stage cannot be stopped in the middle) */ + DEBUGLOG(5, "stream compression stage (flushMode==%u)", flushMode); + { int const inputBuffered = (zcs->appliedParams.inBufferMode == ZSTD_bm_buffered); + void* cDst; + size_t cSize; + size_t oSize = oend-op; + size_t const iSize = inputBuffered + ? zcs->inBuffPos - zcs->inToCompress + : MIN((size_t)(iend - ip), zcs->blockSize); + if (oSize >= ZSTD_compressBound(iSize) || zcs->appliedParams.outBufferMode == ZSTD_bm_stable) + cDst = op; /* compress into output buffer, to skip flush stage */ + else + cDst = zcs->outBuff, oSize = zcs->outBuffSize; + if (inputBuffered) { + unsigned const lastBlock = (flushMode == ZSTD_e_end) && (ip==iend); + cSize = lastBlock ? + ZSTD_compressEnd(zcs, cDst, oSize, + zcs->inBuff + zcs->inToCompress, iSize) : + ZSTD_compressContinue(zcs, cDst, oSize, + zcs->inBuff + zcs->inToCompress, iSize); + FORWARD_IF_ERROR(cSize, "%s", lastBlock ? "ZSTD_compressEnd failed" : "ZSTD_compressContinue failed"); + zcs->frameEnded = lastBlock; + /* prepare next block */ + zcs->inBuffTarget = zcs->inBuffPos + zcs->blockSize; + if (zcs->inBuffTarget > zcs->inBuffSize) + zcs->inBuffPos = 0, zcs->inBuffTarget = zcs->blockSize; + DEBUGLOG(5, "inBuffTarget:%u / inBuffSize:%u", + (unsigned)zcs->inBuffTarget, (unsigned)zcs->inBuffSize); + if (!lastBlock) + assert(zcs->inBuffTarget <= zcs->inBuffSize); + zcs->inToCompress = zcs->inBuffPos; + } else { + unsigned const lastBlock = (ip + iSize == iend); + assert(flushMode == ZSTD_e_end /* Already validated */); + cSize = lastBlock ? + ZSTD_compressEnd(zcs, cDst, oSize, ip, iSize) : + ZSTD_compressContinue(zcs, cDst, oSize, ip, iSize); + /* Consume the input prior to error checking to mirror buffered mode. */ + if (iSize > 0) + ip += iSize; + FORWARD_IF_ERROR(cSize, "%s", lastBlock ? "ZSTD_compressEnd failed" : "ZSTD_compressContinue failed"); + zcs->frameEnded = lastBlock; + if (lastBlock) + assert(ip == iend); + } + if (cDst == op) { /* no need to flush */ + op += cSize; + if (zcs->frameEnded) { + DEBUGLOG(5, "Frame completed directly in outBuffer"); + someMoreWork = 0; + ZSTD_CCtx_reset(zcs, ZSTD_reset_session_only); + } + break; + } + zcs->outBuffContentSize = cSize; + zcs->outBuffFlushedSize = 0; + zcs->streamStage = zcss_flush; /* pass-through to flush stage */ + } + /* fall-through */ + case zcss_flush: + DEBUGLOG(5, "flush stage"); + assert(zcs->appliedParams.outBufferMode == ZSTD_bm_buffered); + { size_t const toFlush = zcs->outBuffContentSize - zcs->outBuffFlushedSize; + size_t const flushed = ZSTD_limitCopy(op, (size_t)(oend-op), + zcs->outBuff + zcs->outBuffFlushedSize, toFlush); + DEBUGLOG(5, "toFlush: %u into %u ==> flushed: %u", + (unsigned)toFlush, (unsigned)(oend-op), (unsigned)flushed); + if (flushed) + op += flushed; + zcs->outBuffFlushedSize += flushed; + if (toFlush!=flushed) { + /* flush not fully completed, presumably because dst is too small */ + assert(op==oend); + someMoreWork = 0; + break; + } + zcs->outBuffContentSize = zcs->outBuffFlushedSize = 0; + if (zcs->frameEnded) { + DEBUGLOG(5, "Frame completed on flush"); + someMoreWork = 0; + ZSTD_CCtx_reset(zcs, ZSTD_reset_session_only); + break; + } + zcs->streamStage = zcss_load; + break; + } + + default: /* impossible */ + assert(0); + } + } + + input->pos = ip - istart; + output->pos = op - ostart; + if (zcs->frameEnded) return 0; + return ZSTD_nextInputSizeHint(zcs); +} + +static size_t ZSTD_nextInputSizeHint_MTorST(const ZSTD_CCtx* cctx) +{ +#ifdef ZSTD_MULTITHREAD + if (cctx->appliedParams.nbWorkers >= 1) { + assert(cctx->mtctx != NULL); + return ZSTDMT_nextInputSizeHint(cctx->mtctx); + } +#endif + return ZSTD_nextInputSizeHint(cctx); + +} + +size_t ZSTD_compressStream(ZSTD_CStream* zcs, ZSTD_outBuffer* output, ZSTD_inBuffer* input) +{ + FORWARD_IF_ERROR( ZSTD_compressStream2(zcs, output, input, ZSTD_e_continue) , ""); + return ZSTD_nextInputSizeHint_MTorST(zcs); +} + +/* After a compression call set the expected input/output buffer. + * This is validated at the start of the next compression call. + */ +static void ZSTD_setBufferExpectations(ZSTD_CCtx* cctx, ZSTD_outBuffer const* output, ZSTD_inBuffer const* input) +{ + if (cctx->appliedParams.inBufferMode == ZSTD_bm_stable) { + cctx->expectedInBuffer = *input; + } + if (cctx->appliedParams.outBufferMode == ZSTD_bm_stable) { + cctx->expectedOutBufferSize = output->size - output->pos; + } +} + +/* Validate that the input/output buffers match the expectations set by + * ZSTD_setBufferExpectations. + */ +static size_t ZSTD_checkBufferStability(ZSTD_CCtx const* cctx, + ZSTD_outBuffer const* output, + ZSTD_inBuffer const* input, + ZSTD_EndDirective endOp) +{ + if (cctx->appliedParams.inBufferMode == ZSTD_bm_stable) { + ZSTD_inBuffer const expect = cctx->expectedInBuffer; + if (expect.src != input->src || expect.pos != input->pos || expect.size != input->size) + RETURN_ERROR(srcBuffer_wrong, "ZSTD_c_stableInBuffer enabled but input differs!"); + if (endOp != ZSTD_e_end) + RETURN_ERROR(srcBuffer_wrong, "ZSTD_c_stableInBuffer can only be used with ZSTD_e_end!"); + } + if (cctx->appliedParams.outBufferMode == ZSTD_bm_stable) { + size_t const outBufferSize = output->size - output->pos; + if (cctx->expectedOutBufferSize != outBufferSize) + RETURN_ERROR(dstBuffer_wrong, "ZSTD_c_stableOutBuffer enabled but output size differs!"); + } + return 0; +} + +static size_t ZSTD_CCtx_init_compressStream2(ZSTD_CCtx* cctx, + ZSTD_EndDirective endOp, + size_t inSize) { + ZSTD_CCtx_params params = cctx->requestedParams; + ZSTD_prefixDict const prefixDict = cctx->prefixDict; + FORWARD_IF_ERROR( ZSTD_initLocalDict(cctx) , ""); /* Init the local dict if present. */ + ZSTD_memset(&cctx->prefixDict, 0, sizeof(cctx->prefixDict)); /* single usage */ + assert(prefixDict.dict==NULL || cctx->cdict==NULL); /* only one can be set */ + if (cctx->cdict && !cctx->localDict.cdict) { + /* Let the cdict's compression level take priority over the requested params. + * But do not take the cdict's compression level if the "cdict" is actually a localDict + * generated from ZSTD_initLocalDict(). + */ + params.compressionLevel = cctx->cdict->compressionLevel; + } + DEBUGLOG(4, "ZSTD_compressStream2 : transparent init stage"); + if (endOp == ZSTD_e_end) cctx->pledgedSrcSizePlusOne = inSize + 1; /* auto-fix pledgedSrcSize */ + { + size_t const dictSize = prefixDict.dict + ? prefixDict.dictSize + : (cctx->cdict ? cctx->cdict->dictContentSize : 0); + ZSTD_cParamMode_e const mode = ZSTD_getCParamMode(cctx->cdict, ¶ms, cctx->pledgedSrcSizePlusOne - 1); + params.cParams = ZSTD_getCParamsFromCCtxParams( + ¶ms, cctx->pledgedSrcSizePlusOne-1, + dictSize, mode); + } + + if (ZSTD_CParams_shouldEnableLdm(¶ms.cParams)) { + /* Enable LDM by default for optimal parser and window size >= 128MB */ + DEBUGLOG(4, "LDM enabled by default (window size >= 128MB, strategy >= btopt)"); + params.ldmParams.enableLdm = 1; + } + + if (ZSTD_CParams_useBlockSplitter(¶ms.cParams)) { + DEBUGLOG(4, "Block splitter enabled by default (window size >= 128K, strategy >= btopt)"); + params.splitBlocks = 1; + } + + params.useRowMatchFinder = ZSTD_resolveRowMatchFinderMode(params.useRowMatchFinder, ¶ms.cParams); + +#ifdef ZSTD_MULTITHREAD + if ((cctx->pledgedSrcSizePlusOne-1) <= ZSTDMT_JOBSIZE_MIN) { + params.nbWorkers = 0; /* do not invoke multi-threading when src size is too small */ + } + if (params.nbWorkers > 0) { +#if ZSTD_TRACE + cctx->traceCtx = (ZSTD_trace_compress_begin != NULL) ? ZSTD_trace_compress_begin(cctx) : 0; +#endif + /* mt context creation */ + if (cctx->mtctx == NULL) { + DEBUGLOG(4, "ZSTD_compressStream2: creating new mtctx for nbWorkers=%u", + params.nbWorkers); + cctx->mtctx = ZSTDMT_createCCtx_advanced((U32)params.nbWorkers, cctx->customMem, cctx->pool); + RETURN_ERROR_IF(cctx->mtctx == NULL, memory_allocation, "NULL pointer!"); + } + /* mt compression */ + DEBUGLOG(4, "call ZSTDMT_initCStream_internal as nbWorkers=%u", params.nbWorkers); + FORWARD_IF_ERROR( ZSTDMT_initCStream_internal( + cctx->mtctx, + prefixDict.dict, prefixDict.dictSize, prefixDict.dictContentType, + cctx->cdict, params, cctx->pledgedSrcSizePlusOne-1) , ""); + cctx->dictID = cctx->cdict ? cctx->cdict->dictID : 0; + cctx->dictContentSize = cctx->cdict ? cctx->cdict->dictContentSize : prefixDict.dictSize; + cctx->consumedSrcSize = 0; + cctx->producedCSize = 0; + cctx->streamStage = zcss_load; + cctx->appliedParams = params; + } else +#endif + { U64 const pledgedSrcSize = cctx->pledgedSrcSizePlusOne - 1; + assert(!ZSTD_isError(ZSTD_checkCParams(params.cParams))); + FORWARD_IF_ERROR( ZSTD_compressBegin_internal(cctx, + prefixDict.dict, prefixDict.dictSize, prefixDict.dictContentType, ZSTD_dtlm_fast, + cctx->cdict, + ¶ms, pledgedSrcSize, + ZSTDb_buffered) , ""); + assert(cctx->appliedParams.nbWorkers == 0); + cctx->inToCompress = 0; + cctx->inBuffPos = 0; + if (cctx->appliedParams.inBufferMode == ZSTD_bm_buffered) { + /* for small input: avoid automatic flush on reaching end of block, since + * it would require to add a 3-bytes null block to end frame + */ + cctx->inBuffTarget = cctx->blockSize + (cctx->blockSize == pledgedSrcSize); + } else { + cctx->inBuffTarget = 0; + } + cctx->outBuffContentSize = cctx->outBuffFlushedSize = 0; + cctx->streamStage = zcss_load; + cctx->frameEnded = 0; + } + return 0; +} + +size_t ZSTD_compressStream2( ZSTD_CCtx* cctx, + ZSTD_outBuffer* output, + ZSTD_inBuffer* input, + ZSTD_EndDirective endOp) +{ + DEBUGLOG(5, "ZSTD_compressStream2, endOp=%u ", (unsigned)endOp); + /* check conditions */ + RETURN_ERROR_IF(output->pos > output->size, dstSize_tooSmall, "invalid output buffer"); + RETURN_ERROR_IF(input->pos > input->size, srcSize_wrong, "invalid input buffer"); + RETURN_ERROR_IF((U32)endOp > (U32)ZSTD_e_end, parameter_outOfBound, "invalid endDirective"); + assert(cctx != NULL); + + /* transparent initialization stage */ + if (cctx->streamStage == zcss_init) { + FORWARD_IF_ERROR(ZSTD_CCtx_init_compressStream2(cctx, endOp, input->size), "CompressStream2 initialization failed"); + ZSTD_setBufferExpectations(cctx, output, input); /* Set initial buffer expectations now that we've initialized */ + } + /* end of transparent initialization stage */ + + FORWARD_IF_ERROR(ZSTD_checkBufferStability(cctx, output, input, endOp), "invalid buffers"); + /* compression stage */ +#ifdef ZSTD_MULTITHREAD + if (cctx->appliedParams.nbWorkers > 0) { + size_t flushMin; + if (cctx->cParamsChanged) { + ZSTDMT_updateCParams_whileCompressing(cctx->mtctx, &cctx->requestedParams); + cctx->cParamsChanged = 0; + } + for (;;) { + size_t const ipos = input->pos; + size_t const opos = output->pos; + flushMin = ZSTDMT_compressStream_generic(cctx->mtctx, output, input, endOp); + cctx->consumedSrcSize += (U64)(input->pos - ipos); + cctx->producedCSize += (U64)(output->pos - opos); + if ( ZSTD_isError(flushMin) + || (endOp == ZSTD_e_end && flushMin == 0) ) { /* compression completed */ + if (flushMin == 0) + ZSTD_CCtx_trace(cctx, 0); + ZSTD_CCtx_reset(cctx, ZSTD_reset_session_only); + } + FORWARD_IF_ERROR(flushMin, "ZSTDMT_compressStream_generic failed"); + + if (endOp == ZSTD_e_continue) { + /* We only require some progress with ZSTD_e_continue, not maximal progress. + * We're done if we've consumed or produced any bytes, or either buffer is + * full. + */ + if (input->pos != ipos || output->pos != opos || input->pos == input->size || output->pos == output->size) + break; + } else { + assert(endOp == ZSTD_e_flush || endOp == ZSTD_e_end); + /* We require maximal progress. We're done when the flush is complete or the + * output buffer is full. + */ + if (flushMin == 0 || output->pos == output->size) + break; + } + } + DEBUGLOG(5, "completed ZSTD_compressStream2 delegating to ZSTDMT_compressStream_generic"); + /* Either we don't require maximum forward progress, we've finished the + * flush, or we are out of output space. + */ + assert(endOp == ZSTD_e_continue || flushMin == 0 || output->pos == output->size); + ZSTD_setBufferExpectations(cctx, output, input); + return flushMin; + } +#endif + FORWARD_IF_ERROR( ZSTD_compressStream_generic(cctx, output, input, endOp) , ""); + DEBUGLOG(5, "completed ZSTD_compressStream2"); + ZSTD_setBufferExpectations(cctx, output, input); + return cctx->outBuffContentSize - cctx->outBuffFlushedSize; /* remaining to flush */ +} + +size_t ZSTD_compressStream2_simpleArgs ( + ZSTD_CCtx* cctx, + void* dst, size_t dstCapacity, size_t* dstPos, + const void* src, size_t srcSize, size_t* srcPos, + ZSTD_EndDirective endOp) +{ + ZSTD_outBuffer output = { dst, dstCapacity, *dstPos }; + ZSTD_inBuffer input = { src, srcSize, *srcPos }; + /* ZSTD_compressStream2() will check validity of dstPos and srcPos */ + size_t const cErr = ZSTD_compressStream2(cctx, &output, &input, endOp); + *dstPos = output.pos; + *srcPos = input.pos; + return cErr; +} + +size_t ZSTD_compress2(ZSTD_CCtx* cctx, + void* dst, size_t dstCapacity, + const void* src, size_t srcSize) +{ + ZSTD_bufferMode_e const originalInBufferMode = cctx->requestedParams.inBufferMode; + ZSTD_bufferMode_e const originalOutBufferMode = cctx->requestedParams.outBufferMode; + DEBUGLOG(4, "ZSTD_compress2 (srcSize=%u)", (unsigned)srcSize); + ZSTD_CCtx_reset(cctx, ZSTD_reset_session_only); + /* Enable stable input/output buffers. */ + cctx->requestedParams.inBufferMode = ZSTD_bm_stable; + cctx->requestedParams.outBufferMode = ZSTD_bm_stable; + { size_t oPos = 0; + size_t iPos = 0; + size_t const result = ZSTD_compressStream2_simpleArgs(cctx, + dst, dstCapacity, &oPos, + src, srcSize, &iPos, + ZSTD_e_end); + /* Reset to the original values. */ + cctx->requestedParams.inBufferMode = originalInBufferMode; + cctx->requestedParams.outBufferMode = originalOutBufferMode; + FORWARD_IF_ERROR(result, "ZSTD_compressStream2_simpleArgs failed"); + if (result != 0) { /* compression not completed, due to lack of output space */ + assert(oPos == dstCapacity); + RETURN_ERROR(dstSize_tooSmall, ""); + } + assert(iPos == srcSize); /* all input is expected consumed */ + return oPos; + } +} + +typedef struct { + U32 idx; /* Index in array of ZSTD_Sequence */ + U32 posInSequence; /* Position within sequence at idx */ + size_t posInSrc; /* Number of bytes given by sequences provided so far */ +} ZSTD_sequencePosition; + +/* Returns a ZSTD error code if sequence is not valid */ +static size_t ZSTD_validateSequence(U32 offCode, U32 matchLength, + size_t posInSrc, U32 windowLog, size_t dictSize, U32 minMatch) { + size_t offsetBound; + U32 windowSize = 1 << windowLog; + /* posInSrc represents the amount of data the the decoder would decode up to this point. + * As long as the amount of data decoded is less than or equal to window size, offsets may be + * larger than the total length of output decoded in order to reference the dict, even larger than + * window size. After output surpasses windowSize, we're limited to windowSize offsets again. + */ + offsetBound = posInSrc > windowSize ? (size_t)windowSize : posInSrc + (size_t)dictSize; + RETURN_ERROR_IF(offCode > offsetBound + ZSTD_REP_MOVE, corruption_detected, "Offset too large!"); + RETURN_ERROR_IF(matchLength < minMatch, corruption_detected, "Matchlength too small"); + return 0; +} + +/* Returns an offset code, given a sequence's raw offset, the ongoing repcode array, and whether litLength == 0 */ +static U32 ZSTD_finalizeOffCode(U32 rawOffset, const U32 rep[ZSTD_REP_NUM], U32 ll0) { + U32 offCode = rawOffset + ZSTD_REP_MOVE; + U32 repCode = 0; + + if (!ll0 && rawOffset == rep[0]) { + repCode = 1; + } else if (rawOffset == rep[1]) { + repCode = 2 - ll0; + } else if (rawOffset == rep[2]) { + repCode = 3 - ll0; + } else if (ll0 && rawOffset == rep[0] - 1) { + repCode = 3; + } + if (repCode) { + /* ZSTD_storeSeq expects a number in the range [0, 2] to represent a repcode */ + offCode = repCode - 1; + } + return offCode; +} + +/* Returns 0 on success, and a ZSTD_error otherwise. This function scans through an array of + * ZSTD_Sequence, storing the sequences it finds, until it reaches a block delimiter. + */ +static size_t ZSTD_copySequencesToSeqStoreExplicitBlockDelim(ZSTD_CCtx* cctx, ZSTD_sequencePosition* seqPos, + const ZSTD_Sequence* const inSeqs, size_t inSeqsSize, + const void* src, size_t blockSize) { + U32 idx = seqPos->idx; + BYTE const* ip = (BYTE const*)(src); + const BYTE* const iend = ip + blockSize; + repcodes_t updatedRepcodes; + U32 dictSize; + U32 litLength; + U32 matchLength; + U32 ll0; + U32 offCode; + + if (cctx->cdict) { + dictSize = (U32)cctx->cdict->dictContentSize; + } else if (cctx->prefixDict.dict) { + dictSize = (U32)cctx->prefixDict.dictSize; + } else { + dictSize = 0; + } + ZSTD_memcpy(updatedRepcodes.rep, cctx->blockState.prevCBlock->rep, sizeof(repcodes_t)); + for (; (inSeqs[idx].matchLength != 0 || inSeqs[idx].offset != 0) && idx < inSeqsSize; ++idx) { + litLength = inSeqs[idx].litLength; + matchLength = inSeqs[idx].matchLength; + ll0 = litLength == 0; + offCode = ZSTD_finalizeOffCode(inSeqs[idx].offset, updatedRepcodes.rep, ll0); + updatedRepcodes = ZSTD_updateRep(updatedRepcodes.rep, offCode, ll0); + + DEBUGLOG(6, "Storing sequence: (of: %u, ml: %u, ll: %u)", offCode, matchLength, litLength); + if (cctx->appliedParams.validateSequences) { + seqPos->posInSrc += litLength + matchLength; + FORWARD_IF_ERROR(ZSTD_validateSequence(offCode, matchLength, seqPos->posInSrc, + cctx->appliedParams.cParams.windowLog, dictSize, + cctx->appliedParams.cParams.minMatch), + "Sequence validation failed"); + } + RETURN_ERROR_IF(idx - seqPos->idx > cctx->seqStore.maxNbSeq, memory_allocation, + "Not enough memory allocated. Try adjusting ZSTD_c_minMatch."); + ZSTD_storeSeq(&cctx->seqStore, litLength, ip, iend, offCode, matchLength - MINMATCH); + ip += matchLength + litLength; + } + ZSTD_memcpy(cctx->blockState.nextCBlock->rep, updatedRepcodes.rep, sizeof(repcodes_t)); + + if (inSeqs[idx].litLength) { + DEBUGLOG(6, "Storing last literals of size: %u", inSeqs[idx].litLength); + ZSTD_storeLastLiterals(&cctx->seqStore, ip, inSeqs[idx].litLength); + ip += inSeqs[idx].litLength; + seqPos->posInSrc += inSeqs[idx].litLength; + } + RETURN_ERROR_IF(ip != iend, corruption_detected, "Blocksize doesn't agree with block delimiter!"); + seqPos->idx = idx+1; + return 0; +} + +/* Returns the number of bytes to move the current read position back by. Only non-zero + * if we ended up splitting a sequence. Otherwise, it may return a ZSTD error if something + * went wrong. + * + * This function will attempt to scan through blockSize bytes represented by the sequences + * in inSeqs, storing any (partial) sequences. + * + * Occasionally, we may want to change the actual number of bytes we consumed from inSeqs to + * avoid splitting a match, or to avoid splitting a match such that it would produce a match + * smaller than MINMATCH. In this case, we return the number of bytes that we didn't read from this block. + */ +static size_t ZSTD_copySequencesToSeqStoreNoBlockDelim(ZSTD_CCtx* cctx, ZSTD_sequencePosition* seqPos, + const ZSTD_Sequence* const inSeqs, size_t inSeqsSize, + const void* src, size_t blockSize) { + U32 idx = seqPos->idx; + U32 startPosInSequence = seqPos->posInSequence; + U32 endPosInSequence = seqPos->posInSequence + (U32)blockSize; + size_t dictSize; + BYTE const* ip = (BYTE const*)(src); + BYTE const* iend = ip + blockSize; /* May be adjusted if we decide to process fewer than blockSize bytes */ + repcodes_t updatedRepcodes; + U32 bytesAdjustment = 0; + U32 finalMatchSplit = 0; + U32 litLength; + U32 matchLength; + U32 rawOffset; + U32 offCode; + + if (cctx->cdict) { + dictSize = cctx->cdict->dictContentSize; + } else if (cctx->prefixDict.dict) { + dictSize = cctx->prefixDict.dictSize; + } else { + dictSize = 0; + } + DEBUGLOG(5, "ZSTD_copySequencesToSeqStore: idx: %u PIS: %u blockSize: %zu", idx, startPosInSequence, blockSize); + DEBUGLOG(5, "Start seq: idx: %u (of: %u ml: %u ll: %u)", idx, inSeqs[idx].offset, inSeqs[idx].matchLength, inSeqs[idx].litLength); + ZSTD_memcpy(updatedRepcodes.rep, cctx->blockState.prevCBlock->rep, sizeof(repcodes_t)); + while (endPosInSequence && idx < inSeqsSize && !finalMatchSplit) { + const ZSTD_Sequence currSeq = inSeqs[idx]; + litLength = currSeq.litLength; + matchLength = currSeq.matchLength; + rawOffset = currSeq.offset; + + /* Modify the sequence depending on where endPosInSequence lies */ + if (endPosInSequence >= currSeq.litLength + currSeq.matchLength) { + if (startPosInSequence >= litLength) { + startPosInSequence -= litLength; + litLength = 0; + matchLength -= startPosInSequence; + } else { + litLength -= startPosInSequence; + } + /* Move to the next sequence */ + endPosInSequence -= currSeq.litLength + currSeq.matchLength; + startPosInSequence = 0; + idx++; + } else { + /* This is the final (partial) sequence we're adding from inSeqs, and endPosInSequence + does not reach the end of the match. So, we have to split the sequence */ + DEBUGLOG(6, "Require a split: diff: %u, idx: %u PIS: %u", + currSeq.litLength + currSeq.matchLength - endPosInSequence, idx, endPosInSequence); + if (endPosInSequence > litLength) { + U32 firstHalfMatchLength; + litLength = startPosInSequence >= litLength ? 0 : litLength - startPosInSequence; + firstHalfMatchLength = endPosInSequence - startPosInSequence - litLength; + if (matchLength > blockSize && firstHalfMatchLength >= cctx->appliedParams.cParams.minMatch) { + /* Only ever split the match if it is larger than the block size */ + U32 secondHalfMatchLength = currSeq.matchLength + currSeq.litLength - endPosInSequence; + if (secondHalfMatchLength < cctx->appliedParams.cParams.minMatch) { + /* Move the endPosInSequence backward so that it creates match of minMatch length */ + endPosInSequence -= cctx->appliedParams.cParams.minMatch - secondHalfMatchLength; + bytesAdjustment = cctx->appliedParams.cParams.minMatch - secondHalfMatchLength; + firstHalfMatchLength -= bytesAdjustment; + } + matchLength = firstHalfMatchLength; + /* Flag that we split the last match - after storing the sequence, exit the loop, + but keep the value of endPosInSequence */ + finalMatchSplit = 1; + } else { + /* Move the position in sequence backwards so that we don't split match, and break to store + * the last literals. We use the original currSeq.litLength as a marker for where endPosInSequence + * should go. We prefer to do this whenever it is not necessary to split the match, or if doing so + * would cause the first half of the match to be too small + */ + bytesAdjustment = endPosInSequence - currSeq.litLength; + endPosInSequence = currSeq.litLength; + break; + } + } else { + /* This sequence ends inside the literals, break to store the last literals */ + break; + } + } + /* Check if this offset can be represented with a repcode */ + { U32 ll0 = (litLength == 0); + offCode = ZSTD_finalizeOffCode(rawOffset, updatedRepcodes.rep, ll0); + updatedRepcodes = ZSTD_updateRep(updatedRepcodes.rep, offCode, ll0); + } + + if (cctx->appliedParams.validateSequences) { + seqPos->posInSrc += litLength + matchLength; + FORWARD_IF_ERROR(ZSTD_validateSequence(offCode, matchLength, seqPos->posInSrc, + cctx->appliedParams.cParams.windowLog, dictSize, + cctx->appliedParams.cParams.minMatch), + "Sequence validation failed"); + } + DEBUGLOG(6, "Storing sequence: (of: %u, ml: %u, ll: %u)", offCode, matchLength, litLength); + RETURN_ERROR_IF(idx - seqPos->idx > cctx->seqStore.maxNbSeq, memory_allocation, + "Not enough memory allocated. Try adjusting ZSTD_c_minMatch."); + ZSTD_storeSeq(&cctx->seqStore, litLength, ip, iend, offCode, matchLength - MINMATCH); + ip += matchLength + litLength; + } + DEBUGLOG(5, "Ending seq: idx: %u (of: %u ml: %u ll: %u)", idx, inSeqs[idx].offset, inSeqs[idx].matchLength, inSeqs[idx].litLength); + assert(idx == inSeqsSize || endPosInSequence <= inSeqs[idx].litLength + inSeqs[idx].matchLength); + seqPos->idx = idx; + seqPos->posInSequence = endPosInSequence; + ZSTD_memcpy(cctx->blockState.nextCBlock->rep, updatedRepcodes.rep, sizeof(repcodes_t)); + + iend -= bytesAdjustment; + if (ip != iend) { + /* Store any last literals */ + U32 lastLLSize = (U32)(iend - ip); + assert(ip <= iend); + DEBUGLOG(6, "Storing last literals of size: %u", lastLLSize); + ZSTD_storeLastLiterals(&cctx->seqStore, ip, lastLLSize); + seqPos->posInSrc += lastLLSize; + } + + return bytesAdjustment; +} + +typedef size_t (*ZSTD_sequenceCopier) (ZSTD_CCtx* cctx, ZSTD_sequencePosition* seqPos, + const ZSTD_Sequence* const inSeqs, size_t inSeqsSize, + const void* src, size_t blockSize); +static ZSTD_sequenceCopier ZSTD_selectSequenceCopier(ZSTD_sequenceFormat_e mode) { + ZSTD_sequenceCopier sequenceCopier = NULL; + assert(ZSTD_cParam_withinBounds(ZSTD_c_blockDelimiters, mode)); + if (mode == ZSTD_sf_explicitBlockDelimiters) { + return ZSTD_copySequencesToSeqStoreExplicitBlockDelim; + } else if (mode == ZSTD_sf_noBlockDelimiters) { + return ZSTD_copySequencesToSeqStoreNoBlockDelim; + } + assert(sequenceCopier != NULL); + return sequenceCopier; +} + +/* Compress, block-by-block, all of the sequences given. + * + * Returns the cumulative size of all compressed blocks (including their headers), otherwise a ZSTD error. + */ +static size_t ZSTD_compressSequences_internal(ZSTD_CCtx* cctx, + void* dst, size_t dstCapacity, + const ZSTD_Sequence* inSeqs, size_t inSeqsSize, + const void* src, size_t srcSize) { + size_t cSize = 0; + U32 lastBlock; + size_t blockSize; + size_t compressedSeqsSize; + size_t remaining = srcSize; + ZSTD_sequencePosition seqPos = {0, 0, 0}; + + BYTE const* ip = (BYTE const*)src; + BYTE* op = (BYTE*)dst; + ZSTD_sequenceCopier sequenceCopier = ZSTD_selectSequenceCopier(cctx->appliedParams.blockDelimiters); + + DEBUGLOG(4, "ZSTD_compressSequences_internal srcSize: %zu, inSeqsSize: %zu", srcSize, inSeqsSize); + /* Special case: empty frame */ + if (remaining == 0) { + U32 const cBlockHeader24 = 1 /* last block */ + (((U32)bt_raw)<<1); + RETURN_ERROR_IF(dstCapacity<4, dstSize_tooSmall, "No room for empty frame block header"); + MEM_writeLE32(op, cBlockHeader24); + op += ZSTD_blockHeaderSize; + dstCapacity -= ZSTD_blockHeaderSize; + cSize += ZSTD_blockHeaderSize; + } + + while (remaining) { + size_t cBlockSize; + size_t additionalByteAdjustment; + lastBlock = remaining <= cctx->blockSize; + blockSize = lastBlock ? (U32)remaining : (U32)cctx->blockSize; + ZSTD_resetSeqStore(&cctx->seqStore); + DEBUGLOG(4, "Working on new block. Blocksize: %zu", blockSize); + + additionalByteAdjustment = sequenceCopier(cctx, &seqPos, inSeqs, inSeqsSize, ip, blockSize); + FORWARD_IF_ERROR(additionalByteAdjustment, "Bad sequence copy"); + blockSize -= additionalByteAdjustment; + + /* If blocks are too small, emit as a nocompress block */ + if (blockSize < MIN_CBLOCK_SIZE+ZSTD_blockHeaderSize+1) { + cBlockSize = ZSTD_noCompressBlock(op, dstCapacity, ip, blockSize, lastBlock); + FORWARD_IF_ERROR(cBlockSize, "Nocompress block failed"); + DEBUGLOG(4, "Block too small, writing out nocompress block: cSize: %zu", cBlockSize); + cSize += cBlockSize; + ip += blockSize; + op += cBlockSize; + remaining -= blockSize; + dstCapacity -= cBlockSize; + continue; + } + + compressedSeqsSize = ZSTD_entropyCompressSeqStore(&cctx->seqStore, + &cctx->blockState.prevCBlock->entropy, &cctx->blockState.nextCBlock->entropy, + &cctx->appliedParams, + op + ZSTD_blockHeaderSize /* Leave space for block header */, dstCapacity - ZSTD_blockHeaderSize, + blockSize, + cctx->entropyWorkspace, ENTROPY_WORKSPACE_SIZE /* statically allocated in resetCCtx */, + cctx->bmi2); + FORWARD_IF_ERROR(compressedSeqsSize, "Compressing sequences of block failed"); + DEBUGLOG(4, "Compressed sequences size: %zu", compressedSeqsSize); + + if (!cctx->isFirstBlock && + ZSTD_maybeRLE(&cctx->seqStore) && + ZSTD_isRLE((BYTE const*)src, srcSize)) { + /* We don't want to emit our first block as a RLE even if it qualifies because + * doing so will cause the decoder (cli only) to throw a "should consume all input error." + * This is only an issue for zstd <= v1.4.3 + */ + compressedSeqsSize = 1; + } + + if (compressedSeqsSize == 0) { + /* ZSTD_noCompressBlock writes the block header as well */ + cBlockSize = ZSTD_noCompressBlock(op, dstCapacity, ip, blockSize, lastBlock); + FORWARD_IF_ERROR(cBlockSize, "Nocompress block failed"); + DEBUGLOG(4, "Writing out nocompress block, size: %zu", cBlockSize); + } else if (compressedSeqsSize == 1) { + cBlockSize = ZSTD_rleCompressBlock(op, dstCapacity, *ip, blockSize, lastBlock); + FORWARD_IF_ERROR(cBlockSize, "RLE compress block failed"); + DEBUGLOG(4, "Writing out RLE block, size: %zu", cBlockSize); + } else { + U32 cBlockHeader; + /* Error checking and repcodes update */ + ZSTD_blockState_confirmRepcodesAndEntropyTables(&cctx->blockState); + if (cctx->blockState.prevCBlock->entropy.fse.offcode_repeatMode == FSE_repeat_valid) + cctx->blockState.prevCBlock->entropy.fse.offcode_repeatMode = FSE_repeat_check; + + /* Write block header into beginning of block*/ + cBlockHeader = lastBlock + (((U32)bt_compressed)<<1) + (U32)(compressedSeqsSize << 3); + MEM_writeLE24(op, cBlockHeader); + cBlockSize = ZSTD_blockHeaderSize + compressedSeqsSize; + DEBUGLOG(4, "Writing out compressed block, size: %zu", cBlockSize); + } + + cSize += cBlockSize; + DEBUGLOG(4, "cSize running total: %zu", cSize); + + if (lastBlock) { + break; + } else { + ip += blockSize; + op += cBlockSize; + remaining -= blockSize; + dstCapacity -= cBlockSize; + cctx->isFirstBlock = 0; + } + } + + return cSize; +} + +size_t ZSTD_compressSequences(ZSTD_CCtx* const cctx, void* dst, size_t dstCapacity, + const ZSTD_Sequence* inSeqs, size_t inSeqsSize, + const void* src, size_t srcSize) { + BYTE* op = (BYTE*)dst; + size_t cSize = 0; + size_t compressedBlocksSize = 0; + size_t frameHeaderSize = 0; + + /* Transparent initialization stage, same as compressStream2() */ + DEBUGLOG(3, "ZSTD_compressSequences()"); + assert(cctx != NULL); + FORWARD_IF_ERROR(ZSTD_CCtx_init_compressStream2(cctx, ZSTD_e_end, srcSize), "CCtx initialization failed"); + /* Begin writing output, starting with frame header */ + frameHeaderSize = ZSTD_writeFrameHeader(op, dstCapacity, &cctx->appliedParams, srcSize, cctx->dictID); + op += frameHeaderSize; + dstCapacity -= frameHeaderSize; + cSize += frameHeaderSize; + if (cctx->appliedParams.fParams.checksumFlag && srcSize) { + XXH64_update(&cctx->xxhState, src, srcSize); + } + /* cSize includes block header size and compressed sequences size */ + compressedBlocksSize = ZSTD_compressSequences_internal(cctx, + op, dstCapacity, + inSeqs, inSeqsSize, + src, srcSize); + FORWARD_IF_ERROR(compressedBlocksSize, "Compressing blocks failed!"); + cSize += compressedBlocksSize; + dstCapacity -= compressedBlocksSize; + + if (cctx->appliedParams.fParams.checksumFlag) { + U32 const checksum = (U32) XXH64_digest(&cctx->xxhState); + RETURN_ERROR_IF(dstCapacity<4, dstSize_tooSmall, "no room for checksum"); + DEBUGLOG(4, "Write checksum : %08X", (unsigned)checksum); + MEM_writeLE32((char*)dst + cSize, checksum); + cSize += 4; + } + + DEBUGLOG(3, "Final compressed size: %zu", cSize); + return cSize; +} + +/*====== Finalize ======*/ + +/*! ZSTD_flushStream() : + * @return : amount of data remaining to flush */ +size_t ZSTD_flushStream(ZSTD_CStream* zcs, ZSTD_outBuffer* output) +{ + ZSTD_inBuffer input = { NULL, 0, 0 }; + return ZSTD_compressStream2(zcs, output, &input, ZSTD_e_flush); +} + + +size_t ZSTD_endStream(ZSTD_CStream* zcs, ZSTD_outBuffer* output) +{ + ZSTD_inBuffer input = { NULL, 0, 0 }; + size_t const remainingToFlush = ZSTD_compressStream2(zcs, output, &input, ZSTD_e_end); + FORWARD_IF_ERROR( remainingToFlush , "ZSTD_compressStream2 failed"); + if (zcs->appliedParams.nbWorkers > 0) return remainingToFlush; /* minimal estimation */ + /* single thread mode : attempt to calculate remaining to flush more precisely */ + { size_t const lastBlockSize = zcs->frameEnded ? 0 : ZSTD_BLOCKHEADERSIZE; + size_t const checksumSize = (size_t)(zcs->frameEnded ? 0 : zcs->appliedParams.fParams.checksumFlag * 4); + size_t const toFlush = remainingToFlush + lastBlockSize + checksumSize; + DEBUGLOG(4, "ZSTD_endStream : remaining to flush : %u", (unsigned)toFlush); + return toFlush; + } +} + + +/*-===== Pre-defined compression levels =====-*/ + +#define ZSTD_MAX_CLEVEL 22 +int ZSTD_maxCLevel(void) { return ZSTD_MAX_CLEVEL; } +int ZSTD_minCLevel(void) { return (int)-ZSTD_TARGETLENGTH_MAX; } +int ZSTD_defaultCLevel(void) { return ZSTD_CLEVEL_DEFAULT; } + +static const ZSTD_compressionParameters ZSTD_defaultCParameters[4][ZSTD_MAX_CLEVEL+1] = { +{ /* "default" - for any srcSize > 256 KB */ + /* W, C, H, S, L, TL, strat */ + { 19, 12, 13, 1, 6, 1, ZSTD_fast }, /* base for negative levels */ + { 19, 13, 14, 1, 7, 0, ZSTD_fast }, /* level 1 */ + { 20, 15, 16, 1, 6, 0, ZSTD_fast }, /* level 2 */ + { 21, 16, 17, 1, 5, 0, ZSTD_dfast }, /* level 3 */ + { 21, 18, 18, 1, 5, 0, ZSTD_dfast }, /* level 4 */ + { 21, 18, 19, 2, 5, 2, ZSTD_greedy }, /* level 5 */ + { 21, 19, 19, 3, 5, 4, ZSTD_greedy }, /* level 6 */ + { 21, 19, 19, 3, 5, 8, ZSTD_lazy }, /* level 7 */ + { 21, 19, 19, 3, 5, 16, ZSTD_lazy2 }, /* level 8 */ + { 21, 19, 20, 4, 5, 16, ZSTD_lazy2 }, /* level 9 */ + { 22, 20, 21, 4, 5, 16, ZSTD_lazy2 }, /* level 10 */ + { 22, 21, 22, 4, 5, 16, ZSTD_lazy2 }, /* level 11 */ + { 22, 21, 22, 5, 5, 16, ZSTD_lazy2 }, /* level 12 */ + { 22, 21, 22, 5, 5, 32, ZSTD_btlazy2 }, /* level 13 */ + { 22, 22, 23, 5, 5, 32, ZSTD_btlazy2 }, /* level 14 */ + { 22, 23, 23, 6, 5, 32, ZSTD_btlazy2 }, /* level 15 */ + { 22, 22, 22, 5, 5, 48, ZSTD_btopt }, /* level 16 */ + { 23, 23, 22, 5, 4, 64, ZSTD_btopt }, /* level 17 */ + { 23, 23, 22, 6, 3, 64, ZSTD_btultra }, /* level 18 */ + { 23, 24, 22, 7, 3,256, ZSTD_btultra2}, /* level 19 */ + { 25, 25, 23, 7, 3,256, ZSTD_btultra2}, /* level 20 */ + { 26, 26, 24, 7, 3,512, ZSTD_btultra2}, /* level 21 */ + { 27, 27, 25, 9, 3,999, ZSTD_btultra2}, /* level 22 */ +}, +{ /* for srcSize <= 256 KB */ + /* W, C, H, S, L, T, strat */ + { 18, 12, 13, 1, 5, 1, ZSTD_fast }, /* base for negative levels */ + { 18, 13, 14, 1, 6, 0, ZSTD_fast }, /* level 1 */ + { 18, 14, 14, 1, 5, 0, ZSTD_dfast }, /* level 2 */ + { 18, 16, 16, 1, 4, 0, ZSTD_dfast }, /* level 3 */ + { 18, 16, 17, 2, 5, 2, ZSTD_greedy }, /* level 4.*/ + { 18, 18, 18, 3, 5, 2, ZSTD_greedy }, /* level 5.*/ + { 18, 18, 19, 3, 5, 4, ZSTD_lazy }, /* level 6.*/ + { 18, 18, 19, 4, 4, 4, ZSTD_lazy }, /* level 7 */ + { 18, 18, 19, 4, 4, 8, ZSTD_lazy2 }, /* level 8 */ + { 18, 18, 19, 5, 4, 8, ZSTD_lazy2 }, /* level 9 */ + { 18, 18, 19, 6, 4, 8, ZSTD_lazy2 }, /* level 10 */ + { 18, 18, 19, 5, 4, 12, ZSTD_btlazy2 }, /* level 11.*/ + { 18, 19, 19, 7, 4, 12, ZSTD_btlazy2 }, /* level 12.*/ + { 18, 18, 19, 4, 4, 16, ZSTD_btopt }, /* level 13 */ + { 18, 18, 19, 4, 3, 32, ZSTD_btopt }, /* level 14.*/ + { 18, 18, 19, 6, 3,128, ZSTD_btopt }, /* level 15.*/ + { 18, 19, 19, 6, 3,128, ZSTD_btultra }, /* level 16.*/ + { 18, 19, 19, 8, 3,256, ZSTD_btultra }, /* level 17.*/ + { 18, 19, 19, 6, 3,128, ZSTD_btultra2}, /* level 18.*/ + { 18, 19, 19, 8, 3,256, ZSTD_btultra2}, /* level 19.*/ + { 18, 19, 19, 10, 3,512, ZSTD_btultra2}, /* level 20.*/ + { 18, 19, 19, 12, 3,512, ZSTD_btultra2}, /* level 21.*/ + { 18, 19, 19, 13, 3,999, ZSTD_btultra2}, /* level 22.*/ +}, +{ /* for srcSize <= 128 KB */ + /* W, C, H, S, L, T, strat */ + { 17, 12, 12, 1, 5, 1, ZSTD_fast }, /* base for negative levels */ + { 17, 12, 13, 1, 6, 0, ZSTD_fast }, /* level 1 */ + { 17, 13, 15, 1, 5, 0, ZSTD_fast }, /* level 2 */ + { 17, 15, 16, 2, 5, 0, ZSTD_dfast }, /* level 3 */ + { 17, 17, 17, 2, 4, 0, ZSTD_dfast }, /* level 4 */ + { 17, 16, 17, 3, 4, 2, ZSTD_greedy }, /* level 5 */ + { 17, 17, 17, 3, 4, 4, ZSTD_lazy }, /* level 6 */ + { 17, 17, 17, 3, 4, 8, ZSTD_lazy2 }, /* level 7 */ + { 17, 17, 17, 4, 4, 8, ZSTD_lazy2 }, /* level 8 */ + { 17, 17, 17, 5, 4, 8, ZSTD_lazy2 }, /* level 9 */ + { 17, 17, 17, 6, 4, 8, ZSTD_lazy2 }, /* level 10 */ + { 17, 17, 17, 5, 4, 8, ZSTD_btlazy2 }, /* level 11 */ + { 17, 18, 17, 7, 4, 12, ZSTD_btlazy2 }, /* level 12 */ + { 17, 18, 17, 3, 4, 12, ZSTD_btopt }, /* level 13.*/ + { 17, 18, 17, 4, 3, 32, ZSTD_btopt }, /* level 14.*/ + { 17, 18, 17, 6, 3,256, ZSTD_btopt }, /* level 15.*/ + { 17, 18, 17, 6, 3,128, ZSTD_btultra }, /* level 16.*/ + { 17, 18, 17, 8, 3,256, ZSTD_btultra }, /* level 17.*/ + { 17, 18, 17, 10, 3,512, ZSTD_btultra }, /* level 18.*/ + { 17, 18, 17, 5, 3,256, ZSTD_btultra2}, /* level 19.*/ + { 17, 18, 17, 7, 3,512, ZSTD_btultra2}, /* level 20.*/ + { 17, 18, 17, 9, 3,512, ZSTD_btultra2}, /* level 21.*/ + { 17, 18, 17, 11, 3,999, ZSTD_btultra2}, /* level 22.*/ +}, +{ /* for srcSize <= 16 KB */ + /* W, C, H, S, L, T, strat */ + { 14, 12, 13, 1, 5, 1, ZSTD_fast }, /* base for negative levels */ + { 14, 14, 15, 1, 5, 0, ZSTD_fast }, /* level 1 */ + { 14, 14, 15, 1, 4, 0, ZSTD_fast }, /* level 2 */ + { 14, 14, 15, 2, 4, 0, ZSTD_dfast }, /* level 3 */ + { 14, 14, 14, 4, 4, 2, ZSTD_greedy }, /* level 4 */ + { 14, 14, 14, 3, 4, 4, ZSTD_lazy }, /* level 5.*/ + { 14, 14, 14, 4, 4, 8, ZSTD_lazy2 }, /* level 6 */ + { 14, 14, 14, 6, 4, 8, ZSTD_lazy2 }, /* level 7 */ + { 14, 14, 14, 8, 4, 8, ZSTD_lazy2 }, /* level 8.*/ + { 14, 15, 14, 5, 4, 8, ZSTD_btlazy2 }, /* level 9.*/ + { 14, 15, 14, 9, 4, 8, ZSTD_btlazy2 }, /* level 10.*/ + { 14, 15, 14, 3, 4, 12, ZSTD_btopt }, /* level 11.*/ + { 14, 15, 14, 4, 3, 24, ZSTD_btopt }, /* level 12.*/ + { 14, 15, 14, 5, 3, 32, ZSTD_btultra }, /* level 13.*/ + { 14, 15, 15, 6, 3, 64, ZSTD_btultra }, /* level 14.*/ + { 14, 15, 15, 7, 3,256, ZSTD_btultra }, /* level 15.*/ + { 14, 15, 15, 5, 3, 48, ZSTD_btultra2}, /* level 16.*/ + { 14, 15, 15, 6, 3,128, ZSTD_btultra2}, /* level 17.*/ + { 14, 15, 15, 7, 3,256, ZSTD_btultra2}, /* level 18.*/ + { 14, 15, 15, 8, 3,256, ZSTD_btultra2}, /* level 19.*/ + { 14, 15, 15, 8, 3,512, ZSTD_btultra2}, /* level 20.*/ + { 14, 15, 15, 9, 3,512, ZSTD_btultra2}, /* level 21.*/ + { 14, 15, 15, 10, 3,999, ZSTD_btultra2}, /* level 22.*/ +}, +}; + +static ZSTD_compressionParameters ZSTD_dedicatedDictSearch_getCParams(int const compressionLevel, size_t const dictSize) +{ + ZSTD_compressionParameters cParams = ZSTD_getCParams_internal(compressionLevel, 0, dictSize, ZSTD_cpm_createCDict); + switch (cParams.strategy) { + case ZSTD_fast: + case ZSTD_dfast: + break; + case ZSTD_greedy: + case ZSTD_lazy: + case ZSTD_lazy2: + cParams.hashLog += ZSTD_LAZY_DDSS_BUCKET_LOG; + break; + case ZSTD_btlazy2: + case ZSTD_btopt: + case ZSTD_btultra: + case ZSTD_btultra2: + break; + } + return cParams; +} + +static int ZSTD_dedicatedDictSearch_isSupported( + ZSTD_compressionParameters const* cParams) +{ + return (cParams->strategy >= ZSTD_greedy) + && (cParams->strategy <= ZSTD_lazy2) + && (cParams->hashLog > cParams->chainLog) + && (cParams->chainLog <= 24); +} + +/** + * Reverses the adjustment applied to cparams when enabling dedicated dict + * search. This is used to recover the params set to be used in the working + * context. (Otherwise, those tables would also grow.) + */ +static void ZSTD_dedicatedDictSearch_revertCParams( + ZSTD_compressionParameters* cParams) { + switch (cParams->strategy) { + case ZSTD_fast: + case ZSTD_dfast: + break; + case ZSTD_greedy: + case ZSTD_lazy: + case ZSTD_lazy2: + cParams->hashLog -= ZSTD_LAZY_DDSS_BUCKET_LOG; + if (cParams->hashLog < ZSTD_HASHLOG_MIN) { + cParams->hashLog = ZSTD_HASHLOG_MIN; + } + break; + case ZSTD_btlazy2: + case ZSTD_btopt: + case ZSTD_btultra: + case ZSTD_btultra2: + break; + } +} + +static U64 ZSTD_getCParamRowSize(U64 srcSizeHint, size_t dictSize, ZSTD_cParamMode_e mode) +{ + switch (mode) { + case ZSTD_cpm_unknown: + case ZSTD_cpm_noAttachDict: + case ZSTD_cpm_createCDict: + break; + case ZSTD_cpm_attachDict: + dictSize = 0; + break; + default: + assert(0); + break; + } + { int const unknown = srcSizeHint == ZSTD_CONTENTSIZE_UNKNOWN; + size_t const addedSize = unknown && dictSize > 0 ? 500 : 0; + return unknown && dictSize == 0 ? ZSTD_CONTENTSIZE_UNKNOWN : srcSizeHint+dictSize+addedSize; + } +} + +/*! ZSTD_getCParams_internal() : + * @return ZSTD_compressionParameters structure for a selected compression level, srcSize and dictSize. + * Note: srcSizeHint 0 means 0, use ZSTD_CONTENTSIZE_UNKNOWN for unknown. + * Use dictSize == 0 for unknown or unused. + * Note: `mode` controls how we treat the `dictSize`. See docs for `ZSTD_cParamMode_e`. */ +static ZSTD_compressionParameters ZSTD_getCParams_internal(int compressionLevel, unsigned long long srcSizeHint, size_t dictSize, ZSTD_cParamMode_e mode) +{ + U64 const rSize = ZSTD_getCParamRowSize(srcSizeHint, dictSize, mode); + U32 const tableID = (rSize <= 256 KB) + (rSize <= 128 KB) + (rSize <= 16 KB); + int row; + DEBUGLOG(5, "ZSTD_getCParams_internal (cLevel=%i)", compressionLevel); + + /* row */ + if (compressionLevel == 0) row = ZSTD_CLEVEL_DEFAULT; /* 0 == default */ + else if (compressionLevel < 0) row = 0; /* entry 0 is baseline for fast mode */ + else if (compressionLevel > ZSTD_MAX_CLEVEL) row = ZSTD_MAX_CLEVEL; + else row = compressionLevel; + + { ZSTD_compressionParameters cp = ZSTD_defaultCParameters[tableID][row]; + DEBUGLOG(5, "ZSTD_getCParams_internal selected tableID: %u row: %u strat: %u", tableID, row, (U32)cp.strategy); + /* acceleration factor */ + if (compressionLevel < 0) { + int const clampedCompressionLevel = MAX(ZSTD_minCLevel(), compressionLevel); + cp.targetLength = (unsigned)(-clampedCompressionLevel); + } + /* refine parameters based on srcSize & dictSize */ + return ZSTD_adjustCParams_internal(cp, srcSizeHint, dictSize, mode); + } +} + +/*! ZSTD_getCParams() : + * @return ZSTD_compressionParameters structure for a selected compression level, srcSize and dictSize. + * Size values are optional, provide 0 if not known or unused */ +ZSTD_compressionParameters ZSTD_getCParams(int compressionLevel, unsigned long long srcSizeHint, size_t dictSize) +{ + if (srcSizeHint == 0) srcSizeHint = ZSTD_CONTENTSIZE_UNKNOWN; + return ZSTD_getCParams_internal(compressionLevel, srcSizeHint, dictSize, ZSTD_cpm_unknown); +} + +/*! ZSTD_getParams() : + * same idea as ZSTD_getCParams() + * @return a `ZSTD_parameters` structure (instead of `ZSTD_compressionParameters`). + * Fields of `ZSTD_frameParameters` are set to default values */ +static ZSTD_parameters ZSTD_getParams_internal(int compressionLevel, unsigned long long srcSizeHint, size_t dictSize, ZSTD_cParamMode_e mode) { + ZSTD_parameters params; + ZSTD_compressionParameters const cParams = ZSTD_getCParams_internal(compressionLevel, srcSizeHint, dictSize, mode); + DEBUGLOG(5, "ZSTD_getParams (cLevel=%i)", compressionLevel); + ZSTD_memset(¶ms, 0, sizeof(params)); + params.cParams = cParams; + params.fParams.contentSizeFlag = 1; + return params; +} + +/*! ZSTD_getParams() : + * same idea as ZSTD_getCParams() + * @return a `ZSTD_parameters` structure (instead of `ZSTD_compressionParameters`). + * Fields of `ZSTD_frameParameters` are set to default values */ +ZSTD_parameters ZSTD_getParams(int compressionLevel, unsigned long long srcSizeHint, size_t dictSize) { + if (srcSizeHint == 0) srcSizeHint = ZSTD_CONTENTSIZE_UNKNOWN; + return ZSTD_getParams_internal(compressionLevel, srcSizeHint, dictSize, ZSTD_cpm_unknown); +} diff --git a/external/zstd/lib/compress/zstd_compress_internal.h b/external/zstd/lib/compress/zstd_compress_internal.h new file mode 100644 index 00000000..3b04fd09 --- /dev/null +++ b/external/zstd/lib/compress/zstd_compress_internal.h @@ -0,0 +1,1367 @@ +/* + * Copyright (c) Yann Collet, Facebook, Inc. + * All rights reserved. + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. + */ + +/* This header contains definitions + * that shall **only** be used by modules within lib/compress. + */ + +#ifndef ZSTD_COMPRESS_H +#define ZSTD_COMPRESS_H + +/*-************************************* +* Dependencies +***************************************/ +#include "../common/zstd_internal.h" +#include "zstd_cwksp.h" +#ifdef ZSTD_MULTITHREAD +# include "zstdmt_compress.h" +#endif + +#if defined (__cplusplus) +extern "C" { +#endif + +/*-************************************* +* Constants +***************************************/ +#define kSearchStrength 8 +#define HASH_READ_SIZE 8 +#define ZSTD_DUBT_UNSORTED_MARK 1 /* For btlazy2 strategy, index ZSTD_DUBT_UNSORTED_MARK==1 means "unsorted". + It could be confused for a real successor at index "1", if sorted as larger than its predecessor. + It's not a big deal though : candidate will just be sorted again. + Additionally, candidate position 1 will be lost. + But candidate 1 cannot hide a large tree of candidates, so it's a minimal loss. + The benefit is that ZSTD_DUBT_UNSORTED_MARK cannot be mishandled after table re-use with a different strategy. + This constant is required by ZSTD_compressBlock_btlazy2() and ZSTD_reduceTable_internal() */ + + +/*-************************************* +* Context memory management +***************************************/ +typedef enum { ZSTDcs_created=0, ZSTDcs_init, ZSTDcs_ongoing, ZSTDcs_ending } ZSTD_compressionStage_e; +typedef enum { zcss_init=0, zcss_load, zcss_flush } ZSTD_cStreamStage; + +typedef struct ZSTD_prefixDict_s { + const void* dict; + size_t dictSize; + ZSTD_dictContentType_e dictContentType; +} ZSTD_prefixDict; + +typedef struct { + void* dictBuffer; + void const* dict; + size_t dictSize; + ZSTD_dictContentType_e dictContentType; + ZSTD_CDict* cdict; +} ZSTD_localDict; + +typedef struct { + HUF_CElt CTable[HUF_CTABLE_SIZE_U32(255)]; + HUF_repeat repeatMode; +} ZSTD_hufCTables_t; + +typedef struct { + FSE_CTable offcodeCTable[FSE_CTABLE_SIZE_U32(OffFSELog, MaxOff)]; + FSE_CTable matchlengthCTable[FSE_CTABLE_SIZE_U32(MLFSELog, MaxML)]; + FSE_CTable litlengthCTable[FSE_CTABLE_SIZE_U32(LLFSELog, MaxLL)]; + FSE_repeat offcode_repeatMode; + FSE_repeat matchlength_repeatMode; + FSE_repeat litlength_repeatMode; +} ZSTD_fseCTables_t; + +typedef struct { + ZSTD_hufCTables_t huf; + ZSTD_fseCTables_t fse; +} ZSTD_entropyCTables_t; + +/*********************************************** +* Entropy buffer statistics structs and funcs * +***********************************************/ +/** ZSTD_hufCTablesMetadata_t : + * Stores Literals Block Type for a super-block in hType, and + * huffman tree description in hufDesBuffer. + * hufDesSize refers to the size of huffman tree description in bytes. + * This metadata is populated in ZSTD_buildBlockEntropyStats_literals() */ +typedef struct { + symbolEncodingType_e hType; + BYTE hufDesBuffer[ZSTD_MAX_HUF_HEADER_SIZE]; + size_t hufDesSize; +} ZSTD_hufCTablesMetadata_t; + +/** ZSTD_fseCTablesMetadata_t : + * Stores symbol compression modes for a super-block in {ll, ol, ml}Type, and + * fse tables in fseTablesBuffer. + * fseTablesSize refers to the size of fse tables in bytes. + * This metadata is populated in ZSTD_buildBlockEntropyStats_sequences() */ +typedef struct { + symbolEncodingType_e llType; + symbolEncodingType_e ofType; + symbolEncodingType_e mlType; + BYTE fseTablesBuffer[ZSTD_MAX_FSE_HEADERS_SIZE]; + size_t fseTablesSize; + size_t lastCountSize; /* This is to account for bug in 1.3.4. More detail in ZSTD_entropyCompressSeqStore_internal() */ +} ZSTD_fseCTablesMetadata_t; + +typedef struct { + ZSTD_hufCTablesMetadata_t hufMetadata; + ZSTD_fseCTablesMetadata_t fseMetadata; +} ZSTD_entropyCTablesMetadata_t; + +/** ZSTD_buildBlockEntropyStats() : + * Builds entropy for the block. + * @return : 0 on success or error code */ +size_t ZSTD_buildBlockEntropyStats(seqStore_t* seqStorePtr, + const ZSTD_entropyCTables_t* prevEntropy, + ZSTD_entropyCTables_t* nextEntropy, + const ZSTD_CCtx_params* cctxParams, + ZSTD_entropyCTablesMetadata_t* entropyMetadata, + void* workspace, size_t wkspSize); + +/********************************* +* Compression internals structs * +*********************************/ + +typedef struct { + U32 off; /* Offset code (offset + ZSTD_REP_MOVE) for the match */ + U32 len; /* Raw length of match */ +} ZSTD_match_t; + +typedef struct { + U32 offset; /* Offset of sequence */ + U32 litLength; /* Length of literals prior to match */ + U32 matchLength; /* Raw length of match */ +} rawSeq; + +typedef struct { + rawSeq* seq; /* The start of the sequences */ + size_t pos; /* The index in seq where reading stopped. pos <= size. */ + size_t posInSequence; /* The position within the sequence at seq[pos] where reading + stopped. posInSequence <= seq[pos].litLength + seq[pos].matchLength */ + size_t size; /* The number of sequences. <= capacity. */ + size_t capacity; /* The capacity starting from `seq` pointer */ +} rawSeqStore_t; + +UNUSED_ATTR static const rawSeqStore_t kNullRawSeqStore = {NULL, 0, 0, 0, 0}; + +typedef struct { + int price; + U32 off; + U32 mlen; + U32 litlen; + U32 rep[ZSTD_REP_NUM]; +} ZSTD_optimal_t; + +typedef enum { zop_dynamic=0, zop_predef } ZSTD_OptPrice_e; + +typedef struct { + /* All tables are allocated inside cctx->workspace by ZSTD_resetCCtx_internal() */ + unsigned* litFreq; /* table of literals statistics, of size 256 */ + unsigned* litLengthFreq; /* table of litLength statistics, of size (MaxLL+1) */ + unsigned* matchLengthFreq; /* table of matchLength statistics, of size (MaxML+1) */ + unsigned* offCodeFreq; /* table of offCode statistics, of size (MaxOff+1) */ + ZSTD_match_t* matchTable; /* list of found matches, of size ZSTD_OPT_NUM+1 */ + ZSTD_optimal_t* priceTable; /* All positions tracked by optimal parser, of size ZSTD_OPT_NUM+1 */ + + U32 litSum; /* nb of literals */ + U32 litLengthSum; /* nb of litLength codes */ + U32 matchLengthSum; /* nb of matchLength codes */ + U32 offCodeSum; /* nb of offset codes */ + U32 litSumBasePrice; /* to compare to log2(litfreq) */ + U32 litLengthSumBasePrice; /* to compare to log2(llfreq) */ + U32 matchLengthSumBasePrice;/* to compare to log2(mlfreq) */ + U32 offCodeSumBasePrice; /* to compare to log2(offreq) */ + ZSTD_OptPrice_e priceType; /* prices can be determined dynamically, or follow a pre-defined cost structure */ + const ZSTD_entropyCTables_t* symbolCosts; /* pre-calculated dictionary statistics */ + ZSTD_literalCompressionMode_e literalCompressionMode; +} optState_t; + +typedef struct { + ZSTD_entropyCTables_t entropy; + U32 rep[ZSTD_REP_NUM]; +} ZSTD_compressedBlockState_t; + +typedef struct { + BYTE const* nextSrc; /* next block here to continue on current prefix */ + BYTE const* base; /* All regular indexes relative to this position */ + BYTE const* dictBase; /* extDict indexes relative to this position */ + U32 dictLimit; /* below that point, need extDict */ + U32 lowLimit; /* below that point, no more valid data */ + U32 nbOverflowCorrections; /* Number of times overflow correction has run since + * ZSTD_window_init(). Useful for debugging coredumps + * and for ZSTD_WINDOW_OVERFLOW_CORRECT_FREQUENTLY. + */ +} ZSTD_window_t; + +typedef struct ZSTD_matchState_t ZSTD_matchState_t; + +#define ZSTD_ROW_HASH_CACHE_SIZE 8 /* Size of prefetching hash cache for row-based matchfinder */ + +struct ZSTD_matchState_t { + ZSTD_window_t window; /* State for window round buffer management */ + U32 loadedDictEnd; /* index of end of dictionary, within context's referential. + * When loadedDictEnd != 0, a dictionary is in use, and still valid. + * This relies on a mechanism to set loadedDictEnd=0 when dictionary is no longer within distance. + * Such mechanism is provided within ZSTD_window_enforceMaxDist() and ZSTD_checkDictValidity(). + * When dict referential is copied into active context (i.e. not attached), + * loadedDictEnd == dictSize, since referential starts from zero. + */ + U32 nextToUpdate; /* index from which to continue table update */ + U32 hashLog3; /* dispatch table for matches of len==3 : larger == faster, more memory */ + + U32 rowHashLog; /* For row-based matchfinder: Hashlog based on nb of rows in the hashTable.*/ + U16* tagTable; /* For row-based matchFinder: A row-based table containing the hashes and head index. */ + U32 hashCache[ZSTD_ROW_HASH_CACHE_SIZE]; /* For row-based matchFinder: a cache of hashes to improve speed */ + + U32* hashTable; + U32* hashTable3; + U32* chainTable; + + U32 forceNonContiguous; /* Non-zero if we should force non-contiguous load for the next window update. */ + + int dedicatedDictSearch; /* Indicates whether this matchState is using the + * dedicated dictionary search structure. + */ + optState_t opt; /* optimal parser state */ + const ZSTD_matchState_t* dictMatchState; + ZSTD_compressionParameters cParams; + const rawSeqStore_t* ldmSeqStore; +}; + +typedef struct { + ZSTD_compressedBlockState_t* prevCBlock; + ZSTD_compressedBlockState_t* nextCBlock; + ZSTD_matchState_t matchState; +} ZSTD_blockState_t; + +typedef struct { + U32 offset; + U32 checksum; +} ldmEntry_t; + +typedef struct { + BYTE const* split; + U32 hash; + U32 checksum; + ldmEntry_t* bucket; +} ldmMatchCandidate_t; + +#define LDM_BATCH_SIZE 64 + +typedef struct { + ZSTD_window_t window; /* State for the window round buffer management */ + ldmEntry_t* hashTable; + U32 loadedDictEnd; + BYTE* bucketOffsets; /* Next position in bucket to insert entry */ + size_t splitIndices[LDM_BATCH_SIZE]; + ldmMatchCandidate_t matchCandidates[LDM_BATCH_SIZE]; +} ldmState_t; + +typedef struct { + U32 enableLdm; /* 1 if enable long distance matching */ + U32 hashLog; /* Log size of hashTable */ + U32 bucketSizeLog; /* Log bucket size for collision resolution, at most 8 */ + U32 minMatchLength; /* Minimum match length */ + U32 hashRateLog; /* Log number of entries to skip */ + U32 windowLog; /* Window log for the LDM */ +} ldmParams_t; + +typedef struct { + int collectSequences; + ZSTD_Sequence* seqStart; + size_t seqIndex; + size_t maxSequences; +} SeqCollector; + +struct ZSTD_CCtx_params_s { + ZSTD_format_e format; + ZSTD_compressionParameters cParams; + ZSTD_frameParameters fParams; + + int compressionLevel; + int forceWindow; /* force back-references to respect limit of + * 1< 63) ? ZSTD_highbit32(litLength) + LL_deltaCode : LL_Code[litLength]; +} + +/* ZSTD_MLcode() : + * note : mlBase = matchLength - MINMATCH; + * because it's the format it's stored in seqStore->sequences */ +MEM_STATIC U32 ZSTD_MLcode(U32 mlBase) +{ + static const BYTE ML_Code[128] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, + 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, + 32, 32, 33, 33, 34, 34, 35, 35, 36, 36, 36, 36, 37, 37, 37, 37, + 38, 38, 38, 38, 38, 38, 38, 38, 39, 39, 39, 39, 39, 39, 39, 39, + 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, + 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, + 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, + 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42 }; + static const U32 ML_deltaCode = 36; + return (mlBase > 127) ? ZSTD_highbit32(mlBase) + ML_deltaCode : ML_Code[mlBase]; +} + +typedef struct repcodes_s { + U32 rep[3]; +} repcodes_t; + +MEM_STATIC repcodes_t ZSTD_updateRep(U32 const rep[3], U32 const offset, U32 const ll0) +{ + repcodes_t newReps; + if (offset >= ZSTD_REP_NUM) { /* full offset */ + newReps.rep[2] = rep[1]; + newReps.rep[1] = rep[0]; + newReps.rep[0] = offset - ZSTD_REP_MOVE; + } else { /* repcode */ + U32 const repCode = offset + ll0; + if (repCode > 0) { /* note : if repCode==0, no change */ + U32 const currentOffset = (repCode==ZSTD_REP_NUM) ? (rep[0] - 1) : rep[repCode]; + newReps.rep[2] = (repCode >= 2) ? rep[1] : rep[2]; + newReps.rep[1] = rep[0]; + newReps.rep[0] = currentOffset; + } else { /* repCode == 0 */ + ZSTD_memcpy(&newReps, rep, sizeof(newReps)); + } + } + return newReps; +} + +/* ZSTD_cParam_withinBounds: + * @return 1 if value is within cParam bounds, + * 0 otherwise */ +MEM_STATIC int ZSTD_cParam_withinBounds(ZSTD_cParameter cParam, int value) +{ + ZSTD_bounds const bounds = ZSTD_cParam_getBounds(cParam); + if (ZSTD_isError(bounds.error)) return 0; + if (value < bounds.lowerBound) return 0; + if (value > bounds.upperBound) return 0; + return 1; +} + +/* ZSTD_noCompressBlock() : + * Writes uncompressed block to dst buffer from given src. + * Returns the size of the block */ +MEM_STATIC size_t ZSTD_noCompressBlock (void* dst, size_t dstCapacity, const void* src, size_t srcSize, U32 lastBlock) +{ + U32 const cBlockHeader24 = lastBlock + (((U32)bt_raw)<<1) + (U32)(srcSize << 3); + RETURN_ERROR_IF(srcSize + ZSTD_blockHeaderSize > dstCapacity, + dstSize_tooSmall, "dst buf too small for uncompressed block"); + MEM_writeLE24(dst, cBlockHeader24); + ZSTD_memcpy((BYTE*)dst + ZSTD_blockHeaderSize, src, srcSize); + return ZSTD_blockHeaderSize + srcSize; +} + +MEM_STATIC size_t ZSTD_rleCompressBlock (void* dst, size_t dstCapacity, BYTE src, size_t srcSize, U32 lastBlock) +{ + BYTE* const op = (BYTE*)dst; + U32 const cBlockHeader = lastBlock + (((U32)bt_rle)<<1) + (U32)(srcSize << 3); + RETURN_ERROR_IF(dstCapacity < 4, dstSize_tooSmall, ""); + MEM_writeLE24(op, cBlockHeader); + op[3] = src; + return 4; +} + + +/* ZSTD_minGain() : + * minimum compression required + * to generate a compress block or a compressed literals section. + * note : use same formula for both situations */ +MEM_STATIC size_t ZSTD_minGain(size_t srcSize, ZSTD_strategy strat) +{ + U32 const minlog = (strat>=ZSTD_btultra) ? (U32)(strat) - 1 : 6; + ZSTD_STATIC_ASSERT(ZSTD_btultra == 8); + assert(ZSTD_cParam_withinBounds(ZSTD_c_strategy, strat)); + return (srcSize >> minlog) + 2; +} + +MEM_STATIC int ZSTD_disableLiteralsCompression(const ZSTD_CCtx_params* cctxParams) +{ + switch (cctxParams->literalCompressionMode) { + case ZSTD_lcm_huffman: + return 0; + case ZSTD_lcm_uncompressed: + return 1; + default: + assert(0 /* impossible: pre-validated */); + /* fall-through */ + case ZSTD_lcm_auto: + return (cctxParams->cParams.strategy == ZSTD_fast) && (cctxParams->cParams.targetLength > 0); + } +} + +/*! ZSTD_safecopyLiterals() : + * memcpy() function that won't read beyond more than WILDCOPY_OVERLENGTH bytes past ilimit_w. + * Only called when the sequence ends past ilimit_w, so it only needs to be optimized for single + * large copies. + */ +static void ZSTD_safecopyLiterals(BYTE* op, BYTE const* ip, BYTE const* const iend, BYTE const* ilimit_w) { + assert(iend > ilimit_w); + if (ip <= ilimit_w) { + ZSTD_wildcopy(op, ip, ilimit_w - ip, ZSTD_no_overlap); + op += ilimit_w - ip; + ip = ilimit_w; + } + while (ip < iend) *op++ = *ip++; +} + +/*! ZSTD_storeSeq() : + * Store a sequence (litlen, litPtr, offCode and mlBase) into seqStore_t. + * `offCode` : distance to match + ZSTD_REP_MOVE (values <= ZSTD_REP_MOVE are repCodes). + * `mlBase` : matchLength - MINMATCH + * Allowed to overread literals up to litLimit. +*/ +HINT_INLINE UNUSED_ATTR +void ZSTD_storeSeq(seqStore_t* seqStorePtr, size_t litLength, const BYTE* literals, const BYTE* litLimit, U32 offCode, size_t mlBase) +{ + BYTE const* const litLimit_w = litLimit - WILDCOPY_OVERLENGTH; + BYTE const* const litEnd = literals + litLength; +#if defined(DEBUGLEVEL) && (DEBUGLEVEL >= 6) + static const BYTE* g_start = NULL; + if (g_start==NULL) g_start = (const BYTE*)literals; /* note : index only works for compression within a single segment */ + { U32 const pos = (U32)((const BYTE*)literals - g_start); + DEBUGLOG(6, "Cpos%7u :%3u literals, match%4u bytes at offCode%7u", + pos, (U32)litLength, (U32)mlBase+MINMATCH, (U32)offCode); + } +#endif + assert((size_t)(seqStorePtr->sequences - seqStorePtr->sequencesStart) < seqStorePtr->maxNbSeq); + /* copy Literals */ + assert(seqStorePtr->maxNbLit <= 128 KB); + assert(seqStorePtr->lit + litLength <= seqStorePtr->litStart + seqStorePtr->maxNbLit); + assert(literals + litLength <= litLimit); + if (litEnd <= litLimit_w) { + /* Common case we can use wildcopy. + * First copy 16 bytes, because literals are likely short. + */ + assert(WILDCOPY_OVERLENGTH >= 16); + ZSTD_copy16(seqStorePtr->lit, literals); + if (litLength > 16) { + ZSTD_wildcopy(seqStorePtr->lit+16, literals+16, (ptrdiff_t)litLength-16, ZSTD_no_overlap); + } + } else { + ZSTD_safecopyLiterals(seqStorePtr->lit, literals, litEnd, litLimit_w); + } + seqStorePtr->lit += litLength; + + /* literal Length */ + if (litLength>0xFFFF) { + assert(seqStorePtr->longLengthType == ZSTD_llt_none); /* there can only be a single long length */ + seqStorePtr->longLengthType = ZSTD_llt_literalLength; + seqStorePtr->longLengthPos = (U32)(seqStorePtr->sequences - seqStorePtr->sequencesStart); + } + seqStorePtr->sequences[0].litLength = (U16)litLength; + + /* match offset */ + seqStorePtr->sequences[0].offset = offCode + 1; + + /* match Length */ + if (mlBase>0xFFFF) { + assert(seqStorePtr->longLengthType == ZSTD_llt_none); /* there can only be a single long length */ + seqStorePtr->longLengthType = ZSTD_llt_matchLength; + seqStorePtr->longLengthPos = (U32)(seqStorePtr->sequences - seqStorePtr->sequencesStart); + } + seqStorePtr->sequences[0].matchLength = (U16)mlBase; + + seqStorePtr->sequences++; +} + + +/*-************************************* +* Match length counter +***************************************/ +static unsigned ZSTD_NbCommonBytes (size_t val) +{ + if (MEM_isLittleEndian()) { + if (MEM_64bits()) { +# if defined(_MSC_VER) && defined(_WIN64) +# if STATIC_BMI2 + return _tzcnt_u64(val) >> 3; +# else + unsigned long r = 0; + return _BitScanForward64( &r, (U64)val ) ? (unsigned)(r >> 3) : 0; +# endif +# elif defined(__GNUC__) && (__GNUC__ >= 4) + return (__builtin_ctzll((U64)val) >> 3); +# else + static const int DeBruijnBytePos[64] = { 0, 0, 0, 0, 0, 1, 1, 2, + 0, 3, 1, 3, 1, 4, 2, 7, + 0, 2, 3, 6, 1, 5, 3, 5, + 1, 3, 4, 4, 2, 5, 6, 7, + 7, 0, 1, 2, 3, 3, 4, 6, + 2, 6, 5, 5, 3, 4, 5, 6, + 7, 1, 2, 4, 6, 4, 4, 5, + 7, 2, 6, 5, 7, 6, 7, 7 }; + return DeBruijnBytePos[((U64)((val & -(long long)val) * 0x0218A392CDABBD3FULL)) >> 58]; +# endif + } else { /* 32 bits */ +# if defined(_MSC_VER) + unsigned long r=0; + return _BitScanForward( &r, (U32)val ) ? (unsigned)(r >> 3) : 0; +# elif defined(__GNUC__) && (__GNUC__ >= 3) + return (__builtin_ctz((U32)val) >> 3); +# else + static const int DeBruijnBytePos[32] = { 0, 0, 3, 0, 3, 1, 3, 0, + 3, 2, 2, 1, 3, 2, 0, 1, + 3, 3, 1, 2, 2, 2, 2, 0, + 3, 1, 2, 0, 1, 0, 1, 1 }; + return DeBruijnBytePos[((U32)((val & -(S32)val) * 0x077CB531U)) >> 27]; +# endif + } + } else { /* Big Endian CPU */ + if (MEM_64bits()) { +# if defined(_MSC_VER) && defined(_WIN64) +# if STATIC_BMI2 + return _lzcnt_u64(val) >> 3; +# else + unsigned long r = 0; + return _BitScanReverse64(&r, (U64)val) ? (unsigned)(r >> 3) : 0; +# endif +# elif defined(__GNUC__) && (__GNUC__ >= 4) + return (__builtin_clzll(val) >> 3); +# else + unsigned r; + const unsigned n32 = sizeof(size_t)*4; /* calculate this way due to compiler complaining in 32-bits mode */ + if (!(val>>n32)) { r=4; } else { r=0; val>>=n32; } + if (!(val>>16)) { r+=2; val>>=8; } else { val>>=24; } + r += (!val); + return r; +# endif + } else { /* 32 bits */ +# if defined(_MSC_VER) + unsigned long r = 0; + return _BitScanReverse( &r, (unsigned long)val ) ? (unsigned)(r >> 3) : 0; +# elif defined(__GNUC__) && (__GNUC__ >= 3) + return (__builtin_clz((U32)val) >> 3); +# else + unsigned r; + if (!(val>>16)) { r=2; val>>=8; } else { r=0; val>>=24; } + r += (!val); + return r; +# endif + } } +} + + +MEM_STATIC size_t ZSTD_count(const BYTE* pIn, const BYTE* pMatch, const BYTE* const pInLimit) +{ + const BYTE* const pStart = pIn; + const BYTE* const pInLoopLimit = pInLimit - (sizeof(size_t)-1); + + if (pIn < pInLoopLimit) { + { size_t const diff = MEM_readST(pMatch) ^ MEM_readST(pIn); + if (diff) return ZSTD_NbCommonBytes(diff); } + pIn+=sizeof(size_t); pMatch+=sizeof(size_t); + while (pIn < pInLoopLimit) { + size_t const diff = MEM_readST(pMatch) ^ MEM_readST(pIn); + if (!diff) { pIn+=sizeof(size_t); pMatch+=sizeof(size_t); continue; } + pIn += ZSTD_NbCommonBytes(diff); + return (size_t)(pIn - pStart); + } } + if (MEM_64bits() && (pIn<(pInLimit-3)) && (MEM_read32(pMatch) == MEM_read32(pIn))) { pIn+=4; pMatch+=4; } + if ((pIn<(pInLimit-1)) && (MEM_read16(pMatch) == MEM_read16(pIn))) { pIn+=2; pMatch+=2; } + if ((pIn> (32-h) ; } +MEM_STATIC size_t ZSTD_hash3Ptr(const void* ptr, U32 h) { return ZSTD_hash3(MEM_readLE32(ptr), h); } /* only in zstd_opt.h */ + +static const U32 prime4bytes = 2654435761U; +static U32 ZSTD_hash4(U32 u, U32 h) { return (u * prime4bytes) >> (32-h) ; } +static size_t ZSTD_hash4Ptr(const void* ptr, U32 h) { return ZSTD_hash4(MEM_read32(ptr), h); } + +static const U64 prime5bytes = 889523592379ULL; +static size_t ZSTD_hash5(U64 u, U32 h) { return (size_t)(((u << (64-40)) * prime5bytes) >> (64-h)) ; } +static size_t ZSTD_hash5Ptr(const void* p, U32 h) { return ZSTD_hash5(MEM_readLE64(p), h); } + +static const U64 prime6bytes = 227718039650203ULL; +static size_t ZSTD_hash6(U64 u, U32 h) { return (size_t)(((u << (64-48)) * prime6bytes) >> (64-h)) ; } +static size_t ZSTD_hash6Ptr(const void* p, U32 h) { return ZSTD_hash6(MEM_readLE64(p), h); } + +static const U64 prime7bytes = 58295818150454627ULL; +static size_t ZSTD_hash7(U64 u, U32 h) { return (size_t)(((u << (64-56)) * prime7bytes) >> (64-h)) ; } +static size_t ZSTD_hash7Ptr(const void* p, U32 h) { return ZSTD_hash7(MEM_readLE64(p), h); } + +static const U64 prime8bytes = 0xCF1BBCDCB7A56463ULL; +static size_t ZSTD_hash8(U64 u, U32 h) { return (size_t)(((u) * prime8bytes) >> (64-h)) ; } +static size_t ZSTD_hash8Ptr(const void* p, U32 h) { return ZSTD_hash8(MEM_readLE64(p), h); } + +MEM_STATIC FORCE_INLINE_ATTR +size_t ZSTD_hashPtr(const void* p, U32 hBits, U32 mls) +{ + switch(mls) + { + default: + case 4: return ZSTD_hash4Ptr(p, hBits); + case 5: return ZSTD_hash5Ptr(p, hBits); + case 6: return ZSTD_hash6Ptr(p, hBits); + case 7: return ZSTD_hash7Ptr(p, hBits); + case 8: return ZSTD_hash8Ptr(p, hBits); + } +} + +/** ZSTD_ipow() : + * Return base^exponent. + */ +static U64 ZSTD_ipow(U64 base, U64 exponent) +{ + U64 power = 1; + while (exponent) { + if (exponent & 1) power *= base; + exponent >>= 1; + base *= base; + } + return power; +} + +#define ZSTD_ROLL_HASH_CHAR_OFFSET 10 + +/** ZSTD_rollingHash_append() : + * Add the buffer to the hash value. + */ +static U64 ZSTD_rollingHash_append(U64 hash, void const* buf, size_t size) +{ + BYTE const* istart = (BYTE const*)buf; + size_t pos; + for (pos = 0; pos < size; ++pos) { + hash *= prime8bytes; + hash += istart[pos] + ZSTD_ROLL_HASH_CHAR_OFFSET; + } + return hash; +} + +/** ZSTD_rollingHash_compute() : + * Compute the rolling hash value of the buffer. + */ +MEM_STATIC U64 ZSTD_rollingHash_compute(void const* buf, size_t size) +{ + return ZSTD_rollingHash_append(0, buf, size); +} + +/** ZSTD_rollingHash_primePower() : + * Compute the primePower to be passed to ZSTD_rollingHash_rotate() for a hash + * over a window of length bytes. + */ +MEM_STATIC U64 ZSTD_rollingHash_primePower(U32 length) +{ + return ZSTD_ipow(prime8bytes, length - 1); +} + +/** ZSTD_rollingHash_rotate() : + * Rotate the rolling hash by one byte. + */ +MEM_STATIC U64 ZSTD_rollingHash_rotate(U64 hash, BYTE toRemove, BYTE toAdd, U64 primePower) +{ + hash -= (toRemove + ZSTD_ROLL_HASH_CHAR_OFFSET) * primePower; + hash *= prime8bytes; + hash += toAdd + ZSTD_ROLL_HASH_CHAR_OFFSET; + return hash; +} + +/*-************************************* +* Round buffer management +***************************************/ +#if (ZSTD_WINDOWLOG_MAX_64 > 31) +# error "ZSTD_WINDOWLOG_MAX is too large : would overflow ZSTD_CURRENT_MAX" +#endif +/* Max current allowed */ +#define ZSTD_CURRENT_MAX ((3U << 29) + (1U << ZSTD_WINDOWLOG_MAX)) +/* Maximum chunk size before overflow correction needs to be called again */ +#define ZSTD_CHUNKSIZE_MAX \ + ( ((U32)-1) /* Maximum ending current index */ \ + - ZSTD_CURRENT_MAX) /* Maximum beginning lowLimit */ + +/** + * ZSTD_window_clear(): + * Clears the window containing the history by simply setting it to empty. + */ +MEM_STATIC void ZSTD_window_clear(ZSTD_window_t* window) +{ + size_t const endT = (size_t)(window->nextSrc - window->base); + U32 const end = (U32)endT; + + window->lowLimit = end; + window->dictLimit = end; +} + +MEM_STATIC U32 ZSTD_window_isEmpty(ZSTD_window_t const window) +{ + return window.dictLimit == 1 && + window.lowLimit == 1 && + (window.nextSrc - window.base) == 1; +} + +/** + * ZSTD_window_hasExtDict(): + * Returns non-zero if the window has a non-empty extDict. + */ +MEM_STATIC U32 ZSTD_window_hasExtDict(ZSTD_window_t const window) +{ + return window.lowLimit < window.dictLimit; +} + +/** + * ZSTD_matchState_dictMode(): + * Inspects the provided matchState and figures out what dictMode should be + * passed to the compressor. + */ +MEM_STATIC ZSTD_dictMode_e ZSTD_matchState_dictMode(const ZSTD_matchState_t *ms) +{ + return ZSTD_window_hasExtDict(ms->window) ? + ZSTD_extDict : + ms->dictMatchState != NULL ? + (ms->dictMatchState->dedicatedDictSearch ? ZSTD_dedicatedDictSearch : ZSTD_dictMatchState) : + ZSTD_noDict; +} + +/* Defining this macro to non-zero tells zstd to run the overflow correction + * code much more frequently. This is very inefficient, and should only be + * used for tests and fuzzers. + */ +#ifndef ZSTD_WINDOW_OVERFLOW_CORRECT_FREQUENTLY +# ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION +# define ZSTD_WINDOW_OVERFLOW_CORRECT_FREQUENTLY 1 +# else +# define ZSTD_WINDOW_OVERFLOW_CORRECT_FREQUENTLY 0 +# endif +#endif + +/** + * ZSTD_window_canOverflowCorrect(): + * Returns non-zero if the indices are large enough for overflow correction + * to work correctly without impacting compression ratio. + */ +MEM_STATIC U32 ZSTD_window_canOverflowCorrect(ZSTD_window_t const window, + U32 cycleLog, + U32 maxDist, + U32 loadedDictEnd, + void const* src) +{ + U32 const cycleSize = 1u << cycleLog; + U32 const curr = (U32)((BYTE const*)src - window.base); + U32 const minIndexToOverflowCorrect = cycleSize + MAX(maxDist, cycleSize); + + /* Adjust the min index to backoff the overflow correction frequency, + * so we don't waste too much CPU in overflow correction. If this + * computation overflows we don't really care, we just need to make + * sure it is at least minIndexToOverflowCorrect. + */ + U32 const adjustment = window.nbOverflowCorrections + 1; + U32 const adjustedIndex = MAX(minIndexToOverflowCorrect * adjustment, + minIndexToOverflowCorrect); + U32 const indexLargeEnough = curr > adjustedIndex; + + /* Only overflow correct early if the dictionary is invalidated already, + * so we don't hurt compression ratio. + */ + U32 const dictionaryInvalidated = curr > maxDist + loadedDictEnd; + + return indexLargeEnough && dictionaryInvalidated; +} + +/** + * ZSTD_window_needOverflowCorrection(): + * Returns non-zero if the indices are getting too large and need overflow + * protection. + */ +MEM_STATIC U32 ZSTD_window_needOverflowCorrection(ZSTD_window_t const window, + U32 cycleLog, + U32 maxDist, + U32 loadedDictEnd, + void const* src, + void const* srcEnd) +{ + U32 const curr = (U32)((BYTE const*)srcEnd - window.base); + if (ZSTD_WINDOW_OVERFLOW_CORRECT_FREQUENTLY) { + if (ZSTD_window_canOverflowCorrect(window, cycleLog, maxDist, loadedDictEnd, src)) { + return 1; + } + } + return curr > ZSTD_CURRENT_MAX; +} + +/** + * ZSTD_window_correctOverflow(): + * Reduces the indices to protect from index overflow. + * Returns the correction made to the indices, which must be applied to every + * stored index. + * + * The least significant cycleLog bits of the indices must remain the same, + * which may be 0. Every index up to maxDist in the past must be valid. + */ +MEM_STATIC U32 ZSTD_window_correctOverflow(ZSTD_window_t* window, U32 cycleLog, + U32 maxDist, void const* src) +{ + /* preemptive overflow correction: + * 1. correction is large enough: + * lowLimit > (3<<29) ==> current > 3<<29 + 1< (3<<29 + 1< (3<<29) - (1< (3<<29) - (1<<30) (NOTE: chainLog <= 30) + * > 1<<29 + * + * 2. (ip+ZSTD_CHUNKSIZE_MAX - cctx->base) doesn't overflow: + * After correction, current is less than (1<base < 1<<32. + * 3. (cctx->lowLimit + 1< 3<<29 + 1<base); + U32 const currentCycle0 = curr & cycleMask; + /* Exclude zero so that newCurrent - maxDist >= 1. */ + U32 const currentCycle1 = currentCycle0 == 0 ? cycleSize : currentCycle0; + U32 const newCurrent = currentCycle1 + MAX(maxDist, cycleSize); + U32 const correction = curr - newCurrent; + /* maxDist must be a power of two so that: + * (newCurrent & cycleMask) == (curr & cycleMask) + * This is required to not corrupt the chains / binary tree. + */ + assert((maxDist & (maxDist - 1)) == 0); + assert((curr & cycleMask) == (newCurrent & cycleMask)); + assert(curr > newCurrent); + if (!ZSTD_WINDOW_OVERFLOW_CORRECT_FREQUENTLY) { + /* Loose bound, should be around 1<<29 (see above) */ + assert(correction > 1<<28); + } + + window->base += correction; + window->dictBase += correction; + if (window->lowLimit <= correction) window->lowLimit = 1; + else window->lowLimit -= correction; + if (window->dictLimit <= correction) window->dictLimit = 1; + else window->dictLimit -= correction; + + /* Ensure we can still reference the full window. */ + assert(newCurrent >= maxDist); + assert(newCurrent - maxDist >= 1); + /* Ensure that lowLimit and dictLimit didn't underflow. */ + assert(window->lowLimit <= newCurrent); + assert(window->dictLimit <= newCurrent); + + ++window->nbOverflowCorrections; + + DEBUGLOG(4, "Correction of 0x%x bytes to lowLimit=0x%x", correction, + window->lowLimit); + return correction; +} + +/** + * ZSTD_window_enforceMaxDist(): + * Updates lowLimit so that: + * (srcEnd - base) - lowLimit == maxDist + loadedDictEnd + * + * It ensures index is valid as long as index >= lowLimit. + * This must be called before a block compression call. + * + * loadedDictEnd is only defined if a dictionary is in use for current compression. + * As the name implies, loadedDictEnd represents the index at end of dictionary. + * The value lies within context's referential, it can be directly compared to blockEndIdx. + * + * If loadedDictEndPtr is NULL, no dictionary is in use, and we use loadedDictEnd == 0. + * If loadedDictEndPtr is not NULL, we set it to zero after updating lowLimit. + * This is because dictionaries are allowed to be referenced fully + * as long as the last byte of the dictionary is in the window. + * Once input has progressed beyond window size, dictionary cannot be referenced anymore. + * + * In normal dict mode, the dictionary lies between lowLimit and dictLimit. + * In dictMatchState mode, lowLimit and dictLimit are the same, + * and the dictionary is below them. + * forceWindow and dictMatchState are therefore incompatible. + */ +MEM_STATIC void +ZSTD_window_enforceMaxDist(ZSTD_window_t* window, + const void* blockEnd, + U32 maxDist, + U32* loadedDictEndPtr, + const ZSTD_matchState_t** dictMatchStatePtr) +{ + U32 const blockEndIdx = (U32)((BYTE const*)blockEnd - window->base); + U32 const loadedDictEnd = (loadedDictEndPtr != NULL) ? *loadedDictEndPtr : 0; + DEBUGLOG(5, "ZSTD_window_enforceMaxDist: blockEndIdx=%u, maxDist=%u, loadedDictEnd=%u", + (unsigned)blockEndIdx, (unsigned)maxDist, (unsigned)loadedDictEnd); + + /* - When there is no dictionary : loadedDictEnd == 0. + In which case, the test (blockEndIdx > maxDist) is merely to avoid + overflowing next operation `newLowLimit = blockEndIdx - maxDist`. + - When there is a standard dictionary : + Index referential is copied from the dictionary, + which means it starts from 0. + In which case, loadedDictEnd == dictSize, + and it makes sense to compare `blockEndIdx > maxDist + dictSize` + since `blockEndIdx` also starts from zero. + - When there is an attached dictionary : + loadedDictEnd is expressed within the referential of the context, + so it can be directly compared against blockEndIdx. + */ + if (blockEndIdx > maxDist + loadedDictEnd) { + U32 const newLowLimit = blockEndIdx - maxDist; + if (window->lowLimit < newLowLimit) window->lowLimit = newLowLimit; + if (window->dictLimit < window->lowLimit) { + DEBUGLOG(5, "Update dictLimit to match lowLimit, from %u to %u", + (unsigned)window->dictLimit, (unsigned)window->lowLimit); + window->dictLimit = window->lowLimit; + } + /* On reaching window size, dictionaries are invalidated */ + if (loadedDictEndPtr) *loadedDictEndPtr = 0; + if (dictMatchStatePtr) *dictMatchStatePtr = NULL; + } +} + +/* Similar to ZSTD_window_enforceMaxDist(), + * but only invalidates dictionary + * when input progresses beyond window size. + * assumption : loadedDictEndPtr and dictMatchStatePtr are valid (non NULL) + * loadedDictEnd uses same referential as window->base + * maxDist is the window size */ +MEM_STATIC void +ZSTD_checkDictValidity(const ZSTD_window_t* window, + const void* blockEnd, + U32 maxDist, + U32* loadedDictEndPtr, + const ZSTD_matchState_t** dictMatchStatePtr) +{ + assert(loadedDictEndPtr != NULL); + assert(dictMatchStatePtr != NULL); + { U32 const blockEndIdx = (U32)((BYTE const*)blockEnd - window->base); + U32 const loadedDictEnd = *loadedDictEndPtr; + DEBUGLOG(5, "ZSTD_checkDictValidity: blockEndIdx=%u, maxDist=%u, loadedDictEnd=%u", + (unsigned)blockEndIdx, (unsigned)maxDist, (unsigned)loadedDictEnd); + assert(blockEndIdx >= loadedDictEnd); + + if (blockEndIdx > loadedDictEnd + maxDist) { + /* On reaching window size, dictionaries are invalidated. + * For simplification, if window size is reached anywhere within next block, + * the dictionary is invalidated for the full block. + */ + DEBUGLOG(6, "invalidating dictionary for current block (distance > windowSize)"); + *loadedDictEndPtr = 0; + *dictMatchStatePtr = NULL; + } else { + if (*loadedDictEndPtr != 0) { + DEBUGLOG(6, "dictionary considered valid for current block"); + } } } +} + +MEM_STATIC void ZSTD_window_init(ZSTD_window_t* window) { + ZSTD_memset(window, 0, sizeof(*window)); + window->base = (BYTE const*)""; + window->dictBase = (BYTE const*)""; + window->dictLimit = 1; /* start from 1, so that 1st position is valid */ + window->lowLimit = 1; /* it ensures first and later CCtx usages compress the same */ + window->nextSrc = window->base + 1; /* see issue #1241 */ + window->nbOverflowCorrections = 0; +} + +/** + * ZSTD_window_update(): + * Updates the window by appending [src, src + srcSize) to the window. + * If it is not contiguous, the current prefix becomes the extDict, and we + * forget about the extDict. Handles overlap of the prefix and extDict. + * Returns non-zero if the segment is contiguous. + */ +MEM_STATIC U32 ZSTD_window_update(ZSTD_window_t* window, + void const* src, size_t srcSize, + int forceNonContiguous) +{ + BYTE const* const ip = (BYTE const*)src; + U32 contiguous = 1; + DEBUGLOG(5, "ZSTD_window_update"); + if (srcSize == 0) + return contiguous; + assert(window->base != NULL); + assert(window->dictBase != NULL); + /* Check if blocks follow each other */ + if (src != window->nextSrc || forceNonContiguous) { + /* not contiguous */ + size_t const distanceFromBase = (size_t)(window->nextSrc - window->base); + DEBUGLOG(5, "Non contiguous blocks, new segment starts at %u", window->dictLimit); + window->lowLimit = window->dictLimit; + assert(distanceFromBase == (size_t)(U32)distanceFromBase); /* should never overflow */ + window->dictLimit = (U32)distanceFromBase; + window->dictBase = window->base; + window->base = ip - distanceFromBase; + /* ms->nextToUpdate = window->dictLimit; */ + if (window->dictLimit - window->lowLimit < HASH_READ_SIZE) window->lowLimit = window->dictLimit; /* too small extDict */ + contiguous = 0; + } + window->nextSrc = ip + srcSize; + /* if input and dictionary overlap : reduce dictionary (area presumed modified by input) */ + if ( (ip+srcSize > window->dictBase + window->lowLimit) + & (ip < window->dictBase + window->dictLimit)) { + ptrdiff_t const highInputIdx = (ip + srcSize) - window->dictBase; + U32 const lowLimitMax = (highInputIdx > (ptrdiff_t)window->dictLimit) ? window->dictLimit : (U32)highInputIdx; + window->lowLimit = lowLimitMax; + DEBUGLOG(5, "Overlapping extDict and input : new lowLimit = %u", window->lowLimit); + } + return contiguous; +} + +/** + * Returns the lowest allowed match index. It may either be in the ext-dict or the prefix. + */ +MEM_STATIC U32 ZSTD_getLowestMatchIndex(const ZSTD_matchState_t* ms, U32 curr, unsigned windowLog) +{ + U32 const maxDistance = 1U << windowLog; + U32 const lowestValid = ms->window.lowLimit; + U32 const withinWindow = (curr - lowestValid > maxDistance) ? curr - maxDistance : lowestValid; + U32 const isDictionary = (ms->loadedDictEnd != 0); + /* When using a dictionary the entire dictionary is valid if a single byte of the dictionary + * is within the window. We invalidate the dictionary (and set loadedDictEnd to 0) when it isn't + * valid for the entire block. So this check is sufficient to find the lowest valid match index. + */ + U32 const matchLowest = isDictionary ? lowestValid : withinWindow; + return matchLowest; +} + +/** + * Returns the lowest allowed match index in the prefix. + */ +MEM_STATIC U32 ZSTD_getLowestPrefixIndex(const ZSTD_matchState_t* ms, U32 curr, unsigned windowLog) +{ + U32 const maxDistance = 1U << windowLog; + U32 const lowestValid = ms->window.dictLimit; + U32 const withinWindow = (curr - lowestValid > maxDistance) ? curr - maxDistance : lowestValid; + U32 const isDictionary = (ms->loadedDictEnd != 0); + /* When computing the lowest prefix index we need to take the dictionary into account to handle + * the edge case where the dictionary and the source are contiguous in memory. + */ + U32 const matchLowest = isDictionary ? lowestValid : withinWindow; + return matchLowest; +} + + + +/* debug functions */ +#if (DEBUGLEVEL>=2) + +MEM_STATIC double ZSTD_fWeight(U32 rawStat) +{ + U32 const fp_accuracy = 8; + U32 const fp_multiplier = (1 << fp_accuracy); + U32 const newStat = rawStat + 1; + U32 const hb = ZSTD_highbit32(newStat); + U32 const BWeight = hb * fp_multiplier; + U32 const FWeight = (newStat << fp_accuracy) >> hb; + U32 const weight = BWeight + FWeight; + assert(hb + fp_accuracy < 31); + return (double)weight / fp_multiplier; +} + +/* display a table content, + * listing each element, its frequency, and its predicted bit cost */ +MEM_STATIC void ZSTD_debugTable(const U32* table, U32 max) +{ + unsigned u, sum; + for (u=0, sum=0; u<=max; u++) sum += table[u]; + DEBUGLOG(2, "total nb elts: %u", sum); + for (u=0; u<=max; u++) { + DEBUGLOG(2, "%2u: %5u (%.2f)", + u, table[u], ZSTD_fWeight(sum) - ZSTD_fWeight(table[u]) ); + } +} + +#endif + + +#if defined (__cplusplus) +} +#endif + +/* =============================================================== + * Shared internal declarations + * These prototypes may be called from sources not in lib/compress + * =============================================================== */ + +/* ZSTD_loadCEntropy() : + * dict : must point at beginning of a valid zstd dictionary. + * return : size of dictionary header (size of magic number + dict ID + entropy tables) + * assumptions : magic number supposed already checked + * and dictSize >= 8 */ +size_t ZSTD_loadCEntropy(ZSTD_compressedBlockState_t* bs, void* workspace, + const void* const dict, size_t dictSize); + +void ZSTD_reset_compressedBlockState(ZSTD_compressedBlockState_t* bs); + +/* ============================================================== + * Private declarations + * These prototypes shall only be called from within lib/compress + * ============================================================== */ + +/* ZSTD_getCParamsFromCCtxParams() : + * cParams are built depending on compressionLevel, src size hints, + * LDM and manually set compression parameters. + * Note: srcSizeHint == 0 means 0! + */ +ZSTD_compressionParameters ZSTD_getCParamsFromCCtxParams( + const ZSTD_CCtx_params* CCtxParams, U64 srcSizeHint, size_t dictSize, ZSTD_cParamMode_e mode); + +/*! ZSTD_initCStream_internal() : + * Private use only. Init streaming operation. + * expects params to be valid. + * must receive dict, or cdict, or none, but not both. + * @return : 0, or an error code */ +size_t ZSTD_initCStream_internal(ZSTD_CStream* zcs, + const void* dict, size_t dictSize, + const ZSTD_CDict* cdict, + const ZSTD_CCtx_params* params, unsigned long long pledgedSrcSize); + +void ZSTD_resetSeqStore(seqStore_t* ssPtr); + +/*! ZSTD_getCParamsFromCDict() : + * as the name implies */ +ZSTD_compressionParameters ZSTD_getCParamsFromCDict(const ZSTD_CDict* cdict); + +/* ZSTD_compressBegin_advanced_internal() : + * Private use only. To be called from zstdmt_compress.c. */ +size_t ZSTD_compressBegin_advanced_internal(ZSTD_CCtx* cctx, + const void* dict, size_t dictSize, + ZSTD_dictContentType_e dictContentType, + ZSTD_dictTableLoadMethod_e dtlm, + const ZSTD_CDict* cdict, + const ZSTD_CCtx_params* params, + unsigned long long pledgedSrcSize); + +/* ZSTD_compress_advanced_internal() : + * Private use only. To be called from zstdmt_compress.c. */ +size_t ZSTD_compress_advanced_internal(ZSTD_CCtx* cctx, + void* dst, size_t dstCapacity, + const void* src, size_t srcSize, + const void* dict,size_t dictSize, + const ZSTD_CCtx_params* params); + + +/* ZSTD_writeLastEmptyBlock() : + * output an empty Block with end-of-frame mark to complete a frame + * @return : size of data written into `dst` (== ZSTD_blockHeaderSize (defined in zstd_internal.h)) + * or an error code if `dstCapacity` is too small ( 1 */ +U32 ZSTD_cycleLog(U32 hashLog, ZSTD_strategy strat); + +/** ZSTD_CCtx_trace() : + * Trace the end of a compression call. + */ +void ZSTD_CCtx_trace(ZSTD_CCtx* cctx, size_t extraCSize); + +#endif /* ZSTD_COMPRESS_H */ diff --git a/external/zstd/lib/compress/zstd_compress_literals.c b/external/zstd/lib/compress/zstd_compress_literals.c new file mode 100644 index 00000000..008337bb --- /dev/null +++ b/external/zstd/lib/compress/zstd_compress_literals.c @@ -0,0 +1,158 @@ +/* + * Copyright (c) Yann Collet, Facebook, Inc. + * All rights reserved. + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. + */ + + /*-************************************* + * Dependencies + ***************************************/ +#include "zstd_compress_literals.h" + +size_t ZSTD_noCompressLiterals (void* dst, size_t dstCapacity, const void* src, size_t srcSize) +{ + BYTE* const ostart = (BYTE*)dst; + U32 const flSize = 1 + (srcSize>31) + (srcSize>4095); + + RETURN_ERROR_IF(srcSize + flSize > dstCapacity, dstSize_tooSmall, ""); + + switch(flSize) + { + case 1: /* 2 - 1 - 5 */ + ostart[0] = (BYTE)((U32)set_basic + (srcSize<<3)); + break; + case 2: /* 2 - 2 - 12 */ + MEM_writeLE16(ostart, (U16)((U32)set_basic + (1<<2) + (srcSize<<4))); + break; + case 3: /* 2 - 2 - 20 */ + MEM_writeLE32(ostart, (U32)((U32)set_basic + (3<<2) + (srcSize<<4))); + break; + default: /* not necessary : flSize is {1,2,3} */ + assert(0); + } + + ZSTD_memcpy(ostart + flSize, src, srcSize); + DEBUGLOG(5, "Raw literals: %u -> %u", (U32)srcSize, (U32)(srcSize + flSize)); + return srcSize + flSize; +} + +size_t ZSTD_compressRleLiteralsBlock (void* dst, size_t dstCapacity, const void* src, size_t srcSize) +{ + BYTE* const ostart = (BYTE*)dst; + U32 const flSize = 1 + (srcSize>31) + (srcSize>4095); + + (void)dstCapacity; /* dstCapacity already guaranteed to be >=4, hence large enough */ + + switch(flSize) + { + case 1: /* 2 - 1 - 5 */ + ostart[0] = (BYTE)((U32)set_rle + (srcSize<<3)); + break; + case 2: /* 2 - 2 - 12 */ + MEM_writeLE16(ostart, (U16)((U32)set_rle + (1<<2) + (srcSize<<4))); + break; + case 3: /* 2 - 2 - 20 */ + MEM_writeLE32(ostart, (U32)((U32)set_rle + (3<<2) + (srcSize<<4))); + break; + default: /* not necessary : flSize is {1,2,3} */ + assert(0); + } + + ostart[flSize] = *(const BYTE*)src; + DEBUGLOG(5, "RLE literals: %u -> %u", (U32)srcSize, (U32)flSize + 1); + return flSize+1; +} + +size_t ZSTD_compressLiterals (ZSTD_hufCTables_t const* prevHuf, + ZSTD_hufCTables_t* nextHuf, + ZSTD_strategy strategy, int disableLiteralCompression, + void* dst, size_t dstCapacity, + const void* src, size_t srcSize, + void* entropyWorkspace, size_t entropyWorkspaceSize, + const int bmi2) +{ + size_t const minGain = ZSTD_minGain(srcSize, strategy); + size_t const lhSize = 3 + (srcSize >= 1 KB) + (srcSize >= 16 KB); + BYTE* const ostart = (BYTE*)dst; + U32 singleStream = srcSize < 256; + symbolEncodingType_e hType = set_compressed; + size_t cLitSize; + + DEBUGLOG(5,"ZSTD_compressLiterals (disableLiteralCompression=%i srcSize=%u)", + disableLiteralCompression, (U32)srcSize); + + /* Prepare nextEntropy assuming reusing the existing table */ + ZSTD_memcpy(nextHuf, prevHuf, sizeof(*prevHuf)); + + if (disableLiteralCompression) + return ZSTD_noCompressLiterals(dst, dstCapacity, src, srcSize); + + /* small ? don't even attempt compression (speed opt) */ +# define COMPRESS_LITERALS_SIZE_MIN 63 + { size_t const minLitSize = (prevHuf->repeatMode == HUF_repeat_valid) ? 6 : COMPRESS_LITERALS_SIZE_MIN; + if (srcSize <= minLitSize) return ZSTD_noCompressLiterals(dst, dstCapacity, src, srcSize); + } + + RETURN_ERROR_IF(dstCapacity < lhSize+1, dstSize_tooSmall, "not enough space for compression"); + { HUF_repeat repeat = prevHuf->repeatMode; + int const preferRepeat = strategy < ZSTD_lazy ? srcSize <= 1024 : 0; + if (repeat == HUF_repeat_valid && lhSize == 3) singleStream = 1; + cLitSize = singleStream ? + HUF_compress1X_repeat( + ostart+lhSize, dstCapacity-lhSize, src, srcSize, + HUF_SYMBOLVALUE_MAX, HUF_TABLELOG_DEFAULT, entropyWorkspace, entropyWorkspaceSize, + (HUF_CElt*)nextHuf->CTable, &repeat, preferRepeat, bmi2) : + HUF_compress4X_repeat( + ostart+lhSize, dstCapacity-lhSize, src, srcSize, + HUF_SYMBOLVALUE_MAX, HUF_TABLELOG_DEFAULT, entropyWorkspace, entropyWorkspaceSize, + (HUF_CElt*)nextHuf->CTable, &repeat, preferRepeat, bmi2); + if (repeat != HUF_repeat_none) { + /* reused the existing table */ + DEBUGLOG(5, "Reusing previous huffman table"); + hType = set_repeat; + } + } + + if ((cLitSize==0) || (cLitSize >= srcSize - minGain) || ERR_isError(cLitSize)) { + ZSTD_memcpy(nextHuf, prevHuf, sizeof(*prevHuf)); + return ZSTD_noCompressLiterals(dst, dstCapacity, src, srcSize); + } + if (cLitSize==1) { + ZSTD_memcpy(nextHuf, prevHuf, sizeof(*prevHuf)); + return ZSTD_compressRleLiteralsBlock(dst, dstCapacity, src, srcSize); + } + + if (hType == set_compressed) { + /* using a newly constructed table */ + nextHuf->repeatMode = HUF_repeat_check; + } + + /* Build header */ + switch(lhSize) + { + case 3: /* 2 - 2 - 10 - 10 */ + { U32 const lhc = hType + ((!singleStream) << 2) + ((U32)srcSize<<4) + ((U32)cLitSize<<14); + MEM_writeLE24(ostart, lhc); + break; + } + case 4: /* 2 - 2 - 14 - 14 */ + { U32 const lhc = hType + (2 << 2) + ((U32)srcSize<<4) + ((U32)cLitSize<<18); + MEM_writeLE32(ostart, lhc); + break; + } + case 5: /* 2 - 2 - 18 - 18 */ + { U32 const lhc = hType + (3 << 2) + ((U32)srcSize<<4) + ((U32)cLitSize<<22); + MEM_writeLE32(ostart, lhc); + ostart[4] = (BYTE)(cLitSize >> 10); + break; + } + default: /* not possible : lhSize is {3,4,5} */ + assert(0); + } + DEBUGLOG(5, "Compressed literals: %u -> %u", (U32)srcSize, (U32)(lhSize+cLitSize)); + return lhSize+cLitSize; +} diff --git a/external/zstd/lib/compress/zstd_compress_literals.h b/external/zstd/lib/compress/zstd_compress_literals.h new file mode 100644 index 00000000..9904c0cd --- /dev/null +++ b/external/zstd/lib/compress/zstd_compress_literals.h @@ -0,0 +1,29 @@ +/* + * Copyright (c) Yann Collet, Facebook, Inc. + * All rights reserved. + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. + */ + +#ifndef ZSTD_COMPRESS_LITERALS_H +#define ZSTD_COMPRESS_LITERALS_H + +#include "zstd_compress_internal.h" /* ZSTD_hufCTables_t, ZSTD_minGain() */ + + +size_t ZSTD_noCompressLiterals (void* dst, size_t dstCapacity, const void* src, size_t srcSize); + +size_t ZSTD_compressRleLiteralsBlock (void* dst, size_t dstCapacity, const void* src, size_t srcSize); + +size_t ZSTD_compressLiterals (ZSTD_hufCTables_t const* prevHuf, + ZSTD_hufCTables_t* nextHuf, + ZSTD_strategy strategy, int disableLiteralCompression, + void* dst, size_t dstCapacity, + const void* src, size_t srcSize, + void* entropyWorkspace, size_t entropyWorkspaceSize, + const int bmi2); + +#endif /* ZSTD_COMPRESS_LITERALS_H */ diff --git a/external/zstd/lib/compress/zstd_compress_sequences.c b/external/zstd/lib/compress/zstd_compress_sequences.c new file mode 100644 index 00000000..611eabdc --- /dev/null +++ b/external/zstd/lib/compress/zstd_compress_sequences.c @@ -0,0 +1,441 @@ +/* + * Copyright (c) Yann Collet, Facebook, Inc. + * All rights reserved. + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. + */ + + /*-************************************* + * Dependencies + ***************************************/ +#include "zstd_compress_sequences.h" + +/** + * -log2(x / 256) lookup table for x in [0, 256). + * If x == 0: Return 0 + * Else: Return floor(-log2(x / 256) * 256) + */ +static unsigned const kInverseProbabilityLog256[256] = { + 0, 2048, 1792, 1642, 1536, 1453, 1386, 1329, 1280, 1236, 1197, 1162, + 1130, 1100, 1073, 1047, 1024, 1001, 980, 960, 941, 923, 906, 889, + 874, 859, 844, 830, 817, 804, 791, 779, 768, 756, 745, 734, + 724, 714, 704, 694, 685, 676, 667, 658, 650, 642, 633, 626, + 618, 610, 603, 595, 588, 581, 574, 567, 561, 554, 548, 542, + 535, 529, 523, 517, 512, 506, 500, 495, 489, 484, 478, 473, + 468, 463, 458, 453, 448, 443, 438, 434, 429, 424, 420, 415, + 411, 407, 402, 398, 394, 390, 386, 382, 377, 373, 370, 366, + 362, 358, 354, 350, 347, 343, 339, 336, 332, 329, 325, 322, + 318, 315, 311, 308, 305, 302, 298, 295, 292, 289, 286, 282, + 279, 276, 273, 270, 267, 264, 261, 258, 256, 253, 250, 247, + 244, 241, 239, 236, 233, 230, 228, 225, 222, 220, 217, 215, + 212, 209, 207, 204, 202, 199, 197, 194, 192, 190, 187, 185, + 182, 180, 178, 175, 173, 171, 168, 166, 164, 162, 159, 157, + 155, 153, 151, 149, 146, 144, 142, 140, 138, 136, 134, 132, + 130, 128, 126, 123, 121, 119, 117, 115, 114, 112, 110, 108, + 106, 104, 102, 100, 98, 96, 94, 93, 91, 89, 87, 85, + 83, 82, 80, 78, 76, 74, 73, 71, 69, 67, 66, 64, + 62, 61, 59, 57, 55, 54, 52, 50, 49, 47, 46, 44, + 42, 41, 39, 37, 36, 34, 33, 31, 30, 28, 26, 25, + 23, 22, 20, 19, 17, 16, 14, 13, 11, 10, 8, 7, + 5, 4, 2, 1, +}; + +static unsigned ZSTD_getFSEMaxSymbolValue(FSE_CTable const* ctable) { + void const* ptr = ctable; + U16 const* u16ptr = (U16 const*)ptr; + U32 const maxSymbolValue = MEM_read16(u16ptr + 1); + return maxSymbolValue; +} + +/** + * Returns true if we should use ncount=-1 else we should + * use ncount=1 for low probability symbols instead. + */ +static unsigned ZSTD_useLowProbCount(size_t const nbSeq) +{ + /* Heuristic: This should cover most blocks <= 16K and + * start to fade out after 16K to about 32K depending on + * comprssibility. + */ + return nbSeq >= 2048; +} + +/** + * Returns the cost in bytes of encoding the normalized count header. + * Returns an error if any of the helper functions return an error. + */ +static size_t ZSTD_NCountCost(unsigned const* count, unsigned const max, + size_t const nbSeq, unsigned const FSELog) +{ + BYTE wksp[FSE_NCOUNTBOUND]; + S16 norm[MaxSeq + 1]; + const U32 tableLog = FSE_optimalTableLog(FSELog, nbSeq, max); + FORWARD_IF_ERROR(FSE_normalizeCount(norm, tableLog, count, nbSeq, max, ZSTD_useLowProbCount(nbSeq)), ""); + return FSE_writeNCount(wksp, sizeof(wksp), norm, max, tableLog); +} + +/** + * Returns the cost in bits of encoding the distribution described by count + * using the entropy bound. + */ +static size_t ZSTD_entropyCost(unsigned const* count, unsigned const max, size_t const total) +{ + unsigned cost = 0; + unsigned s; + + assert(total > 0); + for (s = 0; s <= max; ++s) { + unsigned norm = (unsigned)((256 * count[s]) / total); + if (count[s] != 0 && norm == 0) + norm = 1; + assert(count[s] < total); + cost += count[s] * kInverseProbabilityLog256[norm]; + } + return cost >> 8; +} + +/** + * Returns the cost in bits of encoding the distribution in count using ctable. + * Returns an error if ctable cannot represent all the symbols in count. + */ +size_t ZSTD_fseBitCost( + FSE_CTable const* ctable, + unsigned const* count, + unsigned const max) +{ + unsigned const kAccuracyLog = 8; + size_t cost = 0; + unsigned s; + FSE_CState_t cstate; + FSE_initCState(&cstate, ctable); + if (ZSTD_getFSEMaxSymbolValue(ctable) < max) { + DEBUGLOG(5, "Repeat FSE_CTable has maxSymbolValue %u < %u", + ZSTD_getFSEMaxSymbolValue(ctable), max); + return ERROR(GENERIC); + } + for (s = 0; s <= max; ++s) { + unsigned const tableLog = cstate.stateLog; + unsigned const badCost = (tableLog + 1) << kAccuracyLog; + unsigned const bitCost = FSE_bitCost(cstate.symbolTT, tableLog, s, kAccuracyLog); + if (count[s] == 0) + continue; + if (bitCost >= badCost) { + DEBUGLOG(5, "Repeat FSE_CTable has Prob[%u] == 0", s); + return ERROR(GENERIC); + } + cost += (size_t)count[s] * bitCost; + } + return cost >> kAccuracyLog; +} + +/** + * Returns the cost in bits of encoding the distribution in count using the + * table described by norm. The max symbol support by norm is assumed >= max. + * norm must be valid for every symbol with non-zero probability in count. + */ +size_t ZSTD_crossEntropyCost(short const* norm, unsigned accuracyLog, + unsigned const* count, unsigned const max) +{ + unsigned const shift = 8 - accuracyLog; + size_t cost = 0; + unsigned s; + assert(accuracyLog <= 8); + for (s = 0; s <= max; ++s) { + unsigned const normAcc = (norm[s] != -1) ? (unsigned)norm[s] : 1; + unsigned const norm256 = normAcc << shift; + assert(norm256 > 0); + assert(norm256 < 256); + cost += count[s] * kInverseProbabilityLog256[norm256]; + } + return cost >> 8; +} + +symbolEncodingType_e +ZSTD_selectEncodingType( + FSE_repeat* repeatMode, unsigned const* count, unsigned const max, + size_t const mostFrequent, size_t nbSeq, unsigned const FSELog, + FSE_CTable const* prevCTable, + short const* defaultNorm, U32 defaultNormLog, + ZSTD_defaultPolicy_e const isDefaultAllowed, + ZSTD_strategy const strategy) +{ + ZSTD_STATIC_ASSERT(ZSTD_defaultDisallowed == 0 && ZSTD_defaultAllowed != 0); + if (mostFrequent == nbSeq) { + *repeatMode = FSE_repeat_none; + if (isDefaultAllowed && nbSeq <= 2) { + /* Prefer set_basic over set_rle when there are 2 or less symbols, + * since RLE uses 1 byte, but set_basic uses 5-6 bits per symbol. + * If basic encoding isn't possible, always choose RLE. + */ + DEBUGLOG(5, "Selected set_basic"); + return set_basic; + } + DEBUGLOG(5, "Selected set_rle"); + return set_rle; + } + if (strategy < ZSTD_lazy) { + if (isDefaultAllowed) { + size_t const staticFse_nbSeq_max = 1000; + size_t const mult = 10 - strategy; + size_t const baseLog = 3; + size_t const dynamicFse_nbSeq_min = (((size_t)1 << defaultNormLog) * mult) >> baseLog; /* 28-36 for offset, 56-72 for lengths */ + assert(defaultNormLog >= 5 && defaultNormLog <= 6); /* xx_DEFAULTNORMLOG */ + assert(mult <= 9 && mult >= 7); + if ( (*repeatMode == FSE_repeat_valid) + && (nbSeq < staticFse_nbSeq_max) ) { + DEBUGLOG(5, "Selected set_repeat"); + return set_repeat; + } + if ( (nbSeq < dynamicFse_nbSeq_min) + || (mostFrequent < (nbSeq >> (defaultNormLog-1))) ) { + DEBUGLOG(5, "Selected set_basic"); + /* The format allows default tables to be repeated, but it isn't useful. + * When using simple heuristics to select encoding type, we don't want + * to confuse these tables with dictionaries. When running more careful + * analysis, we don't need to waste time checking both repeating tables + * and default tables. + */ + *repeatMode = FSE_repeat_none; + return set_basic; + } + } + } else { + size_t const basicCost = isDefaultAllowed ? ZSTD_crossEntropyCost(defaultNorm, defaultNormLog, count, max) : ERROR(GENERIC); + size_t const repeatCost = *repeatMode != FSE_repeat_none ? ZSTD_fseBitCost(prevCTable, count, max) : ERROR(GENERIC); + size_t const NCountCost = ZSTD_NCountCost(count, max, nbSeq, FSELog); + size_t const compressedCost = (NCountCost << 3) + ZSTD_entropyCost(count, max, nbSeq); + + if (isDefaultAllowed) { + assert(!ZSTD_isError(basicCost)); + assert(!(*repeatMode == FSE_repeat_valid && ZSTD_isError(repeatCost))); + } + assert(!ZSTD_isError(NCountCost)); + assert(compressedCost < ERROR(maxCode)); + DEBUGLOG(5, "Estimated bit costs: basic=%u\trepeat=%u\tcompressed=%u", + (unsigned)basicCost, (unsigned)repeatCost, (unsigned)compressedCost); + if (basicCost <= repeatCost && basicCost <= compressedCost) { + DEBUGLOG(5, "Selected set_basic"); + assert(isDefaultAllowed); + *repeatMode = FSE_repeat_none; + return set_basic; + } + if (repeatCost <= compressedCost) { + DEBUGLOG(5, "Selected set_repeat"); + assert(!ZSTD_isError(repeatCost)); + return set_repeat; + } + assert(compressedCost < basicCost && compressedCost < repeatCost); + } + DEBUGLOG(5, "Selected set_compressed"); + *repeatMode = FSE_repeat_check; + return set_compressed; +} + +typedef struct { + S16 norm[MaxSeq + 1]; + U32 wksp[FSE_BUILD_CTABLE_WORKSPACE_SIZE_U32(MaxSeq, MaxFSELog)]; +} ZSTD_BuildCTableWksp; + +size_t +ZSTD_buildCTable(void* dst, size_t dstCapacity, + FSE_CTable* nextCTable, U32 FSELog, symbolEncodingType_e type, + unsigned* count, U32 max, + const BYTE* codeTable, size_t nbSeq, + const S16* defaultNorm, U32 defaultNormLog, U32 defaultMax, + const FSE_CTable* prevCTable, size_t prevCTableSize, + void* entropyWorkspace, size_t entropyWorkspaceSize) +{ + BYTE* op = (BYTE*)dst; + const BYTE* const oend = op + dstCapacity; + DEBUGLOG(6, "ZSTD_buildCTable (dstCapacity=%u)", (unsigned)dstCapacity); + + switch (type) { + case set_rle: + FORWARD_IF_ERROR(FSE_buildCTable_rle(nextCTable, (BYTE)max), ""); + RETURN_ERROR_IF(dstCapacity==0, dstSize_tooSmall, "not enough space"); + *op = codeTable[0]; + return 1; + case set_repeat: + ZSTD_memcpy(nextCTable, prevCTable, prevCTableSize); + return 0; + case set_basic: + FORWARD_IF_ERROR(FSE_buildCTable_wksp(nextCTable, defaultNorm, defaultMax, defaultNormLog, entropyWorkspace, entropyWorkspaceSize), ""); /* note : could be pre-calculated */ + return 0; + case set_compressed: { + ZSTD_BuildCTableWksp* wksp = (ZSTD_BuildCTableWksp*)entropyWorkspace; + size_t nbSeq_1 = nbSeq; + const U32 tableLog = FSE_optimalTableLog(FSELog, nbSeq, max); + if (count[codeTable[nbSeq-1]] > 1) { + count[codeTable[nbSeq-1]]--; + nbSeq_1--; + } + assert(nbSeq_1 > 1); + assert(entropyWorkspaceSize >= sizeof(ZSTD_BuildCTableWksp)); + (void)entropyWorkspaceSize; + FORWARD_IF_ERROR(FSE_normalizeCount(wksp->norm, tableLog, count, nbSeq_1, max, ZSTD_useLowProbCount(nbSeq_1)), ""); + { size_t const NCountSize = FSE_writeNCount(op, oend - op, wksp->norm, max, tableLog); /* overflow protected */ + FORWARD_IF_ERROR(NCountSize, "FSE_writeNCount failed"); + FORWARD_IF_ERROR(FSE_buildCTable_wksp(nextCTable, wksp->norm, max, tableLog, wksp->wksp, sizeof(wksp->wksp)), ""); + return NCountSize; + } + } + default: assert(0); RETURN_ERROR(GENERIC, "impossible to reach"); + } +} + +FORCE_INLINE_TEMPLATE size_t +ZSTD_encodeSequences_body( + void* dst, size_t dstCapacity, + FSE_CTable const* CTable_MatchLength, BYTE const* mlCodeTable, + FSE_CTable const* CTable_OffsetBits, BYTE const* ofCodeTable, + FSE_CTable const* CTable_LitLength, BYTE const* llCodeTable, + seqDef const* sequences, size_t nbSeq, int longOffsets) +{ + BIT_CStream_t blockStream; + FSE_CState_t stateMatchLength; + FSE_CState_t stateOffsetBits; + FSE_CState_t stateLitLength; + + RETURN_ERROR_IF( + ERR_isError(BIT_initCStream(&blockStream, dst, dstCapacity)), + dstSize_tooSmall, "not enough space remaining"); + DEBUGLOG(6, "available space for bitstream : %i (dstCapacity=%u)", + (int)(blockStream.endPtr - blockStream.startPtr), + (unsigned)dstCapacity); + + /* first symbols */ + FSE_initCState2(&stateMatchLength, CTable_MatchLength, mlCodeTable[nbSeq-1]); + FSE_initCState2(&stateOffsetBits, CTable_OffsetBits, ofCodeTable[nbSeq-1]); + FSE_initCState2(&stateLitLength, CTable_LitLength, llCodeTable[nbSeq-1]); + BIT_addBits(&blockStream, sequences[nbSeq-1].litLength, LL_bits[llCodeTable[nbSeq-1]]); + if (MEM_32bits()) BIT_flushBits(&blockStream); + BIT_addBits(&blockStream, sequences[nbSeq-1].matchLength, ML_bits[mlCodeTable[nbSeq-1]]); + if (MEM_32bits()) BIT_flushBits(&blockStream); + if (longOffsets) { + U32 const ofBits = ofCodeTable[nbSeq-1]; + unsigned const extraBits = ofBits - MIN(ofBits, STREAM_ACCUMULATOR_MIN-1); + if (extraBits) { + BIT_addBits(&blockStream, sequences[nbSeq-1].offset, extraBits); + BIT_flushBits(&blockStream); + } + BIT_addBits(&blockStream, sequences[nbSeq-1].offset >> extraBits, + ofBits - extraBits); + } else { + BIT_addBits(&blockStream, sequences[nbSeq-1].offset, ofCodeTable[nbSeq-1]); + } + BIT_flushBits(&blockStream); + + { size_t n; + for (n=nbSeq-2 ; n= 64-7-(LLFSELog+MLFSELog+OffFSELog))) + BIT_flushBits(&blockStream); /* (7)*/ + BIT_addBits(&blockStream, sequences[n].litLength, llBits); + if (MEM_32bits() && ((llBits+mlBits)>24)) BIT_flushBits(&blockStream); + BIT_addBits(&blockStream, sequences[n].matchLength, mlBits); + if (MEM_32bits() || (ofBits+mlBits+llBits > 56)) BIT_flushBits(&blockStream); + if (longOffsets) { + unsigned const extraBits = ofBits - MIN(ofBits, STREAM_ACCUMULATOR_MIN-1); + if (extraBits) { + BIT_addBits(&blockStream, sequences[n].offset, extraBits); + BIT_flushBits(&blockStream); /* (7)*/ + } + BIT_addBits(&blockStream, sequences[n].offset >> extraBits, + ofBits - extraBits); /* 31 */ + } else { + BIT_addBits(&blockStream, sequences[n].offset, ofBits); /* 31 */ + } + BIT_flushBits(&blockStream); /* (7)*/ + DEBUGLOG(7, "remaining space : %i", (int)(blockStream.endPtr - blockStream.ptr)); + } } + + DEBUGLOG(6, "ZSTD_encodeSequences: flushing ML state with %u bits", stateMatchLength.stateLog); + FSE_flushCState(&blockStream, &stateMatchLength); + DEBUGLOG(6, "ZSTD_encodeSequences: flushing Off state with %u bits", stateOffsetBits.stateLog); + FSE_flushCState(&blockStream, &stateOffsetBits); + DEBUGLOG(6, "ZSTD_encodeSequences: flushing LL state with %u bits", stateLitLength.stateLog); + FSE_flushCState(&blockStream, &stateLitLength); + + { size_t const streamSize = BIT_closeCStream(&blockStream); + RETURN_ERROR_IF(streamSize==0, dstSize_tooSmall, "not enough space"); + return streamSize; + } +} + +static size_t +ZSTD_encodeSequences_default( + void* dst, size_t dstCapacity, + FSE_CTable const* CTable_MatchLength, BYTE const* mlCodeTable, + FSE_CTable const* CTable_OffsetBits, BYTE const* ofCodeTable, + FSE_CTable const* CTable_LitLength, BYTE const* llCodeTable, + seqDef const* sequences, size_t nbSeq, int longOffsets) +{ + return ZSTD_encodeSequences_body(dst, dstCapacity, + CTable_MatchLength, mlCodeTable, + CTable_OffsetBits, ofCodeTable, + CTable_LitLength, llCodeTable, + sequences, nbSeq, longOffsets); +} + + +#if DYNAMIC_BMI2 + +static TARGET_ATTRIBUTE("bmi2") size_t +ZSTD_encodeSequences_bmi2( + void* dst, size_t dstCapacity, + FSE_CTable const* CTable_MatchLength, BYTE const* mlCodeTable, + FSE_CTable const* CTable_OffsetBits, BYTE const* ofCodeTable, + FSE_CTable const* CTable_LitLength, BYTE const* llCodeTable, + seqDef const* sequences, size_t nbSeq, int longOffsets) +{ + return ZSTD_encodeSequences_body(dst, dstCapacity, + CTable_MatchLength, mlCodeTable, + CTable_OffsetBits, ofCodeTable, + CTable_LitLength, llCodeTable, + sequences, nbSeq, longOffsets); +} + +#endif + +size_t ZSTD_encodeSequences( + void* dst, size_t dstCapacity, + FSE_CTable const* CTable_MatchLength, BYTE const* mlCodeTable, + FSE_CTable const* CTable_OffsetBits, BYTE const* ofCodeTable, + FSE_CTable const* CTable_LitLength, BYTE const* llCodeTable, + seqDef const* sequences, size_t nbSeq, int longOffsets, int bmi2) +{ + DEBUGLOG(5, "ZSTD_encodeSequences: dstCapacity = %u", (unsigned)dstCapacity); +#if DYNAMIC_BMI2 + if (bmi2) { + return ZSTD_encodeSequences_bmi2(dst, dstCapacity, + CTable_MatchLength, mlCodeTable, + CTable_OffsetBits, ofCodeTable, + CTable_LitLength, llCodeTable, + sequences, nbSeq, longOffsets); + } +#endif + (void)bmi2; + return ZSTD_encodeSequences_default(dst, dstCapacity, + CTable_MatchLength, mlCodeTable, + CTable_OffsetBits, ofCodeTable, + CTable_LitLength, llCodeTable, + sequences, nbSeq, longOffsets); +} diff --git a/external/zstd/lib/compress/zstd_compress_sequences.h b/external/zstd/lib/compress/zstd_compress_sequences.h new file mode 100644 index 00000000..7991364c --- /dev/null +++ b/external/zstd/lib/compress/zstd_compress_sequences.h @@ -0,0 +1,54 @@ +/* + * Copyright (c) Yann Collet, Facebook, Inc. + * All rights reserved. + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. + */ + +#ifndef ZSTD_COMPRESS_SEQUENCES_H +#define ZSTD_COMPRESS_SEQUENCES_H + +#include "../common/fse.h" /* FSE_repeat, FSE_CTable */ +#include "../common/zstd_internal.h" /* symbolEncodingType_e, ZSTD_strategy */ + +typedef enum { + ZSTD_defaultDisallowed = 0, + ZSTD_defaultAllowed = 1 +} ZSTD_defaultPolicy_e; + +symbolEncodingType_e +ZSTD_selectEncodingType( + FSE_repeat* repeatMode, unsigned const* count, unsigned const max, + size_t const mostFrequent, size_t nbSeq, unsigned const FSELog, + FSE_CTable const* prevCTable, + short const* defaultNorm, U32 defaultNormLog, + ZSTD_defaultPolicy_e const isDefaultAllowed, + ZSTD_strategy const strategy); + +size_t +ZSTD_buildCTable(void* dst, size_t dstCapacity, + FSE_CTable* nextCTable, U32 FSELog, symbolEncodingType_e type, + unsigned* count, U32 max, + const BYTE* codeTable, size_t nbSeq, + const S16* defaultNorm, U32 defaultNormLog, U32 defaultMax, + const FSE_CTable* prevCTable, size_t prevCTableSize, + void* entropyWorkspace, size_t entropyWorkspaceSize); + +size_t ZSTD_encodeSequences( + void* dst, size_t dstCapacity, + FSE_CTable const* CTable_MatchLength, BYTE const* mlCodeTable, + FSE_CTable const* CTable_OffsetBits, BYTE const* ofCodeTable, + FSE_CTable const* CTable_LitLength, BYTE const* llCodeTable, + seqDef const* sequences, size_t nbSeq, int longOffsets, int bmi2); + +size_t ZSTD_fseBitCost( + FSE_CTable const* ctable, + unsigned const* count, + unsigned const max); + +size_t ZSTD_crossEntropyCost(short const* norm, unsigned accuracyLog, + unsigned const* count, unsigned const max); +#endif /* ZSTD_COMPRESS_SEQUENCES_H */ diff --git a/external/zstd/lib/compress/zstd_compress_superblock.c b/external/zstd/lib/compress/zstd_compress_superblock.c new file mode 100644 index 00000000..e4e45069 --- /dev/null +++ b/external/zstd/lib/compress/zstd_compress_superblock.c @@ -0,0 +1,572 @@ +/* + * Copyright (c) Yann Collet, Facebook, Inc. + * All rights reserved. + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. + */ + + /*-************************************* + * Dependencies + ***************************************/ +#include "zstd_compress_superblock.h" + +#include "../common/zstd_internal.h" /* ZSTD_getSequenceLength */ +#include "hist.h" /* HIST_countFast_wksp */ +#include "zstd_compress_internal.h" /* ZSTD_[huf|fse|entropy]CTablesMetadata_t */ +#include "zstd_compress_sequences.h" +#include "zstd_compress_literals.h" + +/** ZSTD_compressSubBlock_literal() : + * Compresses literals section for a sub-block. + * When we have to write the Huffman table we will sometimes choose a header + * size larger than necessary. This is because we have to pick the header size + * before we know the table size + compressed size, so we have a bound on the + * table size. If we guessed incorrectly, we fall back to uncompressed literals. + * + * We write the header when writeEntropy=1 and set entropyWritten=1 when we succeeded + * in writing the header, otherwise it is set to 0. + * + * hufMetadata->hType has literals block type info. + * If it is set_basic, all sub-blocks literals section will be Raw_Literals_Block. + * If it is set_rle, all sub-blocks literals section will be RLE_Literals_Block. + * If it is set_compressed, first sub-block's literals section will be Compressed_Literals_Block + * If it is set_compressed, first sub-block's literals section will be Treeless_Literals_Block + * and the following sub-blocks' literals sections will be Treeless_Literals_Block. + * @return : compressed size of literals section of a sub-block + * Or 0 if it unable to compress. + * Or error code */ +static size_t ZSTD_compressSubBlock_literal(const HUF_CElt* hufTable, + const ZSTD_hufCTablesMetadata_t* hufMetadata, + const BYTE* literals, size_t litSize, + void* dst, size_t dstSize, + const int bmi2, int writeEntropy, int* entropyWritten) +{ + size_t const header = writeEntropy ? 200 : 0; + size_t const lhSize = 3 + (litSize >= (1 KB - header)) + (litSize >= (16 KB - header)); + BYTE* const ostart = (BYTE*)dst; + BYTE* const oend = ostart + dstSize; + BYTE* op = ostart + lhSize; + U32 const singleStream = lhSize == 3; + symbolEncodingType_e hType = writeEntropy ? hufMetadata->hType : set_repeat; + size_t cLitSize = 0; + + (void)bmi2; /* TODO bmi2... */ + + DEBUGLOG(5, "ZSTD_compressSubBlock_literal (litSize=%zu, lhSize=%zu, writeEntropy=%d)", litSize, lhSize, writeEntropy); + + *entropyWritten = 0; + if (litSize == 0 || hufMetadata->hType == set_basic) { + DEBUGLOG(5, "ZSTD_compressSubBlock_literal using raw literal"); + return ZSTD_noCompressLiterals(dst, dstSize, literals, litSize); + } else if (hufMetadata->hType == set_rle) { + DEBUGLOG(5, "ZSTD_compressSubBlock_literal using rle literal"); + return ZSTD_compressRleLiteralsBlock(dst, dstSize, literals, litSize); + } + + assert(litSize > 0); + assert(hufMetadata->hType == set_compressed || hufMetadata->hType == set_repeat); + + if (writeEntropy && hufMetadata->hType == set_compressed) { + ZSTD_memcpy(op, hufMetadata->hufDesBuffer, hufMetadata->hufDesSize); + op += hufMetadata->hufDesSize; + cLitSize += hufMetadata->hufDesSize; + DEBUGLOG(5, "ZSTD_compressSubBlock_literal (hSize=%zu)", hufMetadata->hufDesSize); + } + + /* TODO bmi2 */ + { const size_t cSize = singleStream ? HUF_compress1X_usingCTable(op, oend-op, literals, litSize, hufTable) + : HUF_compress4X_usingCTable(op, oend-op, literals, litSize, hufTable); + op += cSize; + cLitSize += cSize; + if (cSize == 0 || ERR_isError(cSize)) { + DEBUGLOG(5, "Failed to write entropy tables %s", ZSTD_getErrorName(cSize)); + return 0; + } + /* If we expand and we aren't writing a header then emit uncompressed */ + if (!writeEntropy && cLitSize >= litSize) { + DEBUGLOG(5, "ZSTD_compressSubBlock_literal using raw literal because uncompressible"); + return ZSTD_noCompressLiterals(dst, dstSize, literals, litSize); + } + /* If we are writing headers then allow expansion that doesn't change our header size. */ + if (lhSize < (size_t)(3 + (cLitSize >= 1 KB) + (cLitSize >= 16 KB))) { + assert(cLitSize > litSize); + DEBUGLOG(5, "Literals expanded beyond allowed header size"); + return ZSTD_noCompressLiterals(dst, dstSize, literals, litSize); + } + DEBUGLOG(5, "ZSTD_compressSubBlock_literal (cSize=%zu)", cSize); + } + + /* Build header */ + switch(lhSize) + { + case 3: /* 2 - 2 - 10 - 10 */ + { U32 const lhc = hType + ((!singleStream) << 2) + ((U32)litSize<<4) + ((U32)cLitSize<<14); + MEM_writeLE24(ostart, lhc); + break; + } + case 4: /* 2 - 2 - 14 - 14 */ + { U32 const lhc = hType + (2 << 2) + ((U32)litSize<<4) + ((U32)cLitSize<<18); + MEM_writeLE32(ostart, lhc); + break; + } + case 5: /* 2 - 2 - 18 - 18 */ + { U32 const lhc = hType + (3 << 2) + ((U32)litSize<<4) + ((U32)cLitSize<<22); + MEM_writeLE32(ostart, lhc); + ostart[4] = (BYTE)(cLitSize >> 10); + break; + } + default: /* not possible : lhSize is {3,4,5} */ + assert(0); + } + *entropyWritten = 1; + DEBUGLOG(5, "Compressed literals: %u -> %u", (U32)litSize, (U32)(op-ostart)); + return op-ostart; +} + +static size_t ZSTD_seqDecompressedSize(seqStore_t const* seqStore, const seqDef* sequences, size_t nbSeq, size_t litSize, int lastSequence) { + const seqDef* const sstart = sequences; + const seqDef* const send = sequences + nbSeq; + const seqDef* sp = sstart; + size_t matchLengthSum = 0; + size_t litLengthSum = 0; + while (send-sp > 0) { + ZSTD_sequenceLength const seqLen = ZSTD_getSequenceLength(seqStore, sp); + litLengthSum += seqLen.litLength; + matchLengthSum += seqLen.matchLength; + sp++; + } + assert(litLengthSum <= litSize); + if (!lastSequence) { + assert(litLengthSum == litSize); + } + return matchLengthSum + litSize; +} + +/** ZSTD_compressSubBlock_sequences() : + * Compresses sequences section for a sub-block. + * fseMetadata->llType, fseMetadata->ofType, and fseMetadata->mlType have + * symbol compression modes for the super-block. + * The first successfully compressed block will have these in its header. + * We set entropyWritten=1 when we succeed in compressing the sequences. + * The following sub-blocks will always have repeat mode. + * @return : compressed size of sequences section of a sub-block + * Or 0 if it is unable to compress + * Or error code. */ +static size_t ZSTD_compressSubBlock_sequences(const ZSTD_fseCTables_t* fseTables, + const ZSTD_fseCTablesMetadata_t* fseMetadata, + const seqDef* sequences, size_t nbSeq, + const BYTE* llCode, const BYTE* mlCode, const BYTE* ofCode, + const ZSTD_CCtx_params* cctxParams, + void* dst, size_t dstCapacity, + const int bmi2, int writeEntropy, int* entropyWritten) +{ + const int longOffsets = cctxParams->cParams.windowLog > STREAM_ACCUMULATOR_MIN; + BYTE* const ostart = (BYTE*)dst; + BYTE* const oend = ostart + dstCapacity; + BYTE* op = ostart; + BYTE* seqHead; + + DEBUGLOG(5, "ZSTD_compressSubBlock_sequences (nbSeq=%zu, writeEntropy=%d, longOffsets=%d)", nbSeq, writeEntropy, longOffsets); + + *entropyWritten = 0; + /* Sequences Header */ + RETURN_ERROR_IF((oend-op) < 3 /*max nbSeq Size*/ + 1 /*seqHead*/, + dstSize_tooSmall, ""); + if (nbSeq < 0x7F) + *op++ = (BYTE)nbSeq; + else if (nbSeq < LONGNBSEQ) + op[0] = (BYTE)((nbSeq>>8) + 0x80), op[1] = (BYTE)nbSeq, op+=2; + else + op[0]=0xFF, MEM_writeLE16(op+1, (U16)(nbSeq - LONGNBSEQ)), op+=3; + if (nbSeq==0) { + return op - ostart; + } + + /* seqHead : flags for FSE encoding type */ + seqHead = op++; + + DEBUGLOG(5, "ZSTD_compressSubBlock_sequences (seqHeadSize=%u)", (unsigned)(op-ostart)); + + if (writeEntropy) { + const U32 LLtype = fseMetadata->llType; + const U32 Offtype = fseMetadata->ofType; + const U32 MLtype = fseMetadata->mlType; + DEBUGLOG(5, "ZSTD_compressSubBlock_sequences (fseTablesSize=%zu)", fseMetadata->fseTablesSize); + *seqHead = (BYTE)((LLtype<<6) + (Offtype<<4) + (MLtype<<2)); + ZSTD_memcpy(op, fseMetadata->fseTablesBuffer, fseMetadata->fseTablesSize); + op += fseMetadata->fseTablesSize; + } else { + const U32 repeat = set_repeat; + *seqHead = (BYTE)((repeat<<6) + (repeat<<4) + (repeat<<2)); + } + + { size_t const bitstreamSize = ZSTD_encodeSequences( + op, oend - op, + fseTables->matchlengthCTable, mlCode, + fseTables->offcodeCTable, ofCode, + fseTables->litlengthCTable, llCode, + sequences, nbSeq, + longOffsets, bmi2); + FORWARD_IF_ERROR(bitstreamSize, "ZSTD_encodeSequences failed"); + op += bitstreamSize; + /* zstd versions <= 1.3.4 mistakenly report corruption when + * FSE_readNCount() receives a buffer < 4 bytes. + * Fixed by https://github.com/facebook/zstd/pull/1146. + * This can happen when the last set_compressed table present is 2 + * bytes and the bitstream is only one byte. + * In this exceedingly rare case, we will simply emit an uncompressed + * block, since it isn't worth optimizing. + */ +#ifndef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION + if (writeEntropy && fseMetadata->lastCountSize && fseMetadata->lastCountSize + bitstreamSize < 4) { + /* NCountSize >= 2 && bitstreamSize > 0 ==> lastCountSize == 3 */ + assert(fseMetadata->lastCountSize + bitstreamSize == 3); + DEBUGLOG(5, "Avoiding bug in zstd decoder in versions <= 1.3.4 by " + "emitting an uncompressed block."); + return 0; + } +#endif + DEBUGLOG(5, "ZSTD_compressSubBlock_sequences (bitstreamSize=%zu)", bitstreamSize); + } + + /* zstd versions <= 1.4.0 mistakenly report error when + * sequences section body size is less than 3 bytes. + * Fixed by https://github.com/facebook/zstd/pull/1664. + * This can happen when the previous sequences section block is compressed + * with rle mode and the current block's sequences section is compressed + * with repeat mode where sequences section body size can be 1 byte. + */ +#ifndef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION + if (op-seqHead < 4) { + DEBUGLOG(5, "Avoiding bug in zstd decoder in versions <= 1.4.0 by emitting " + "an uncompressed block when sequences are < 4 bytes"); + return 0; + } +#endif + + *entropyWritten = 1; + return op - ostart; +} + +/** ZSTD_compressSubBlock() : + * Compresses a single sub-block. + * @return : compressed size of the sub-block + * Or 0 if it failed to compress. */ +static size_t ZSTD_compressSubBlock(const ZSTD_entropyCTables_t* entropy, + const ZSTD_entropyCTablesMetadata_t* entropyMetadata, + const seqDef* sequences, size_t nbSeq, + const BYTE* literals, size_t litSize, + const BYTE* llCode, const BYTE* mlCode, const BYTE* ofCode, + const ZSTD_CCtx_params* cctxParams, + void* dst, size_t dstCapacity, + const int bmi2, + int writeLitEntropy, int writeSeqEntropy, + int* litEntropyWritten, int* seqEntropyWritten, + U32 lastBlock) +{ + BYTE* const ostart = (BYTE*)dst; + BYTE* const oend = ostart + dstCapacity; + BYTE* op = ostart + ZSTD_blockHeaderSize; + DEBUGLOG(5, "ZSTD_compressSubBlock (litSize=%zu, nbSeq=%zu, writeLitEntropy=%d, writeSeqEntropy=%d, lastBlock=%d)", + litSize, nbSeq, writeLitEntropy, writeSeqEntropy, lastBlock); + { size_t cLitSize = ZSTD_compressSubBlock_literal((const HUF_CElt*)entropy->huf.CTable, + &entropyMetadata->hufMetadata, literals, litSize, + op, oend-op, bmi2, writeLitEntropy, litEntropyWritten); + FORWARD_IF_ERROR(cLitSize, "ZSTD_compressSubBlock_literal failed"); + if (cLitSize == 0) return 0; + op += cLitSize; + } + { size_t cSeqSize = ZSTD_compressSubBlock_sequences(&entropy->fse, + &entropyMetadata->fseMetadata, + sequences, nbSeq, + llCode, mlCode, ofCode, + cctxParams, + op, oend-op, + bmi2, writeSeqEntropy, seqEntropyWritten); + FORWARD_IF_ERROR(cSeqSize, "ZSTD_compressSubBlock_sequences failed"); + if (cSeqSize == 0) return 0; + op += cSeqSize; + } + /* Write block header */ + { size_t cSize = (op-ostart)-ZSTD_blockHeaderSize; + U32 const cBlockHeader24 = lastBlock + (((U32)bt_compressed)<<1) + (U32)(cSize << 3); + MEM_writeLE24(ostart, cBlockHeader24); + } + return op-ostart; +} + +static size_t ZSTD_estimateSubBlockSize_literal(const BYTE* literals, size_t litSize, + const ZSTD_hufCTables_t* huf, + const ZSTD_hufCTablesMetadata_t* hufMetadata, + void* workspace, size_t wkspSize, + int writeEntropy) +{ + unsigned* const countWksp = (unsigned*)workspace; + unsigned maxSymbolValue = 255; + size_t literalSectionHeaderSize = 3; /* Use hard coded size of 3 bytes */ + + if (hufMetadata->hType == set_basic) return litSize; + else if (hufMetadata->hType == set_rle) return 1; + else if (hufMetadata->hType == set_compressed || hufMetadata->hType == set_repeat) { + size_t const largest = HIST_count_wksp (countWksp, &maxSymbolValue, (const BYTE*)literals, litSize, workspace, wkspSize); + if (ZSTD_isError(largest)) return litSize; + { size_t cLitSizeEstimate = HUF_estimateCompressedSize((const HUF_CElt*)huf->CTable, countWksp, maxSymbolValue); + if (writeEntropy) cLitSizeEstimate += hufMetadata->hufDesSize; + return cLitSizeEstimate + literalSectionHeaderSize; + } } + assert(0); /* impossible */ + return 0; +} + +static size_t ZSTD_estimateSubBlockSize_symbolType(symbolEncodingType_e type, + const BYTE* codeTable, unsigned maxCode, + size_t nbSeq, const FSE_CTable* fseCTable, + const U32* additionalBits, + short const* defaultNorm, U32 defaultNormLog, U32 defaultMax, + void* workspace, size_t wkspSize) +{ + unsigned* const countWksp = (unsigned*)workspace; + const BYTE* ctp = codeTable; + const BYTE* const ctStart = ctp; + const BYTE* const ctEnd = ctStart + nbSeq; + size_t cSymbolTypeSizeEstimateInBits = 0; + unsigned max = maxCode; + + HIST_countFast_wksp(countWksp, &max, codeTable, nbSeq, workspace, wkspSize); /* can't fail */ + if (type == set_basic) { + /* We selected this encoding type, so it must be valid. */ + assert(max <= defaultMax); + cSymbolTypeSizeEstimateInBits = max <= defaultMax + ? ZSTD_crossEntropyCost(defaultNorm, defaultNormLog, countWksp, max) + : ERROR(GENERIC); + } else if (type == set_rle) { + cSymbolTypeSizeEstimateInBits = 0; + } else if (type == set_compressed || type == set_repeat) { + cSymbolTypeSizeEstimateInBits = ZSTD_fseBitCost(fseCTable, countWksp, max); + } + if (ZSTD_isError(cSymbolTypeSizeEstimateInBits)) return nbSeq * 10; + while (ctp < ctEnd) { + if (additionalBits) cSymbolTypeSizeEstimateInBits += additionalBits[*ctp]; + else cSymbolTypeSizeEstimateInBits += *ctp; /* for offset, offset code is also the number of additional bits */ + ctp++; + } + return cSymbolTypeSizeEstimateInBits / 8; +} + +static size_t ZSTD_estimateSubBlockSize_sequences(const BYTE* ofCodeTable, + const BYTE* llCodeTable, + const BYTE* mlCodeTable, + size_t nbSeq, + const ZSTD_fseCTables_t* fseTables, + const ZSTD_fseCTablesMetadata_t* fseMetadata, + void* workspace, size_t wkspSize, + int writeEntropy) +{ + size_t const sequencesSectionHeaderSize = 3; /* Use hard coded size of 3 bytes */ + size_t cSeqSizeEstimate = 0; + if (nbSeq == 0) return sequencesSectionHeaderSize; + cSeqSizeEstimate += ZSTD_estimateSubBlockSize_symbolType(fseMetadata->ofType, ofCodeTable, MaxOff, + nbSeq, fseTables->offcodeCTable, NULL, + OF_defaultNorm, OF_defaultNormLog, DefaultMaxOff, + workspace, wkspSize); + cSeqSizeEstimate += ZSTD_estimateSubBlockSize_symbolType(fseMetadata->llType, llCodeTable, MaxLL, + nbSeq, fseTables->litlengthCTable, LL_bits, + LL_defaultNorm, LL_defaultNormLog, MaxLL, + workspace, wkspSize); + cSeqSizeEstimate += ZSTD_estimateSubBlockSize_symbolType(fseMetadata->mlType, mlCodeTable, MaxML, + nbSeq, fseTables->matchlengthCTable, ML_bits, + ML_defaultNorm, ML_defaultNormLog, MaxML, + workspace, wkspSize); + if (writeEntropy) cSeqSizeEstimate += fseMetadata->fseTablesSize; + return cSeqSizeEstimate + sequencesSectionHeaderSize; +} + +static size_t ZSTD_estimateSubBlockSize(const BYTE* literals, size_t litSize, + const BYTE* ofCodeTable, + const BYTE* llCodeTable, + const BYTE* mlCodeTable, + size_t nbSeq, + const ZSTD_entropyCTables_t* entropy, + const ZSTD_entropyCTablesMetadata_t* entropyMetadata, + void* workspace, size_t wkspSize, + int writeLitEntropy, int writeSeqEntropy) { + size_t cSizeEstimate = 0; + cSizeEstimate += ZSTD_estimateSubBlockSize_literal(literals, litSize, + &entropy->huf, &entropyMetadata->hufMetadata, + workspace, wkspSize, writeLitEntropy); + cSizeEstimate += ZSTD_estimateSubBlockSize_sequences(ofCodeTable, llCodeTable, mlCodeTable, + nbSeq, &entropy->fse, &entropyMetadata->fseMetadata, + workspace, wkspSize, writeSeqEntropy); + return cSizeEstimate + ZSTD_blockHeaderSize; +} + +static int ZSTD_needSequenceEntropyTables(ZSTD_fseCTablesMetadata_t const* fseMetadata) +{ + if (fseMetadata->llType == set_compressed || fseMetadata->llType == set_rle) + return 1; + if (fseMetadata->mlType == set_compressed || fseMetadata->mlType == set_rle) + return 1; + if (fseMetadata->ofType == set_compressed || fseMetadata->ofType == set_rle) + return 1; + return 0; +} + +/** ZSTD_compressSubBlock_multi() : + * Breaks super-block into multiple sub-blocks and compresses them. + * Entropy will be written to the first block. + * The following blocks will use repeat mode to compress. + * All sub-blocks are compressed blocks (no raw or rle blocks). + * @return : compressed size of the super block (which is multiple ZSTD blocks) + * Or 0 if it failed to compress. */ +static size_t ZSTD_compressSubBlock_multi(const seqStore_t* seqStorePtr, + const ZSTD_compressedBlockState_t* prevCBlock, + ZSTD_compressedBlockState_t* nextCBlock, + const ZSTD_entropyCTablesMetadata_t* entropyMetadata, + const ZSTD_CCtx_params* cctxParams, + void* dst, size_t dstCapacity, + const void* src, size_t srcSize, + const int bmi2, U32 lastBlock, + void* workspace, size_t wkspSize) +{ + const seqDef* const sstart = seqStorePtr->sequencesStart; + const seqDef* const send = seqStorePtr->sequences; + const seqDef* sp = sstart; + const BYTE* const lstart = seqStorePtr->litStart; + const BYTE* const lend = seqStorePtr->lit; + const BYTE* lp = lstart; + BYTE const* ip = (BYTE const*)src; + BYTE const* const iend = ip + srcSize; + BYTE* const ostart = (BYTE*)dst; + BYTE* const oend = ostart + dstCapacity; + BYTE* op = ostart; + const BYTE* llCodePtr = seqStorePtr->llCode; + const BYTE* mlCodePtr = seqStorePtr->mlCode; + const BYTE* ofCodePtr = seqStorePtr->ofCode; + size_t targetCBlockSize = cctxParams->targetCBlockSize; + size_t litSize, seqCount; + int writeLitEntropy = entropyMetadata->hufMetadata.hType == set_compressed; + int writeSeqEntropy = 1; + int lastSequence = 0; + + DEBUGLOG(5, "ZSTD_compressSubBlock_multi (litSize=%u, nbSeq=%u)", + (unsigned)(lend-lp), (unsigned)(send-sstart)); + + litSize = 0; + seqCount = 0; + do { + size_t cBlockSizeEstimate = 0; + if (sstart == send) { + lastSequence = 1; + } else { + const seqDef* const sequence = sp + seqCount; + lastSequence = sequence == send - 1; + litSize += ZSTD_getSequenceLength(seqStorePtr, sequence).litLength; + seqCount++; + } + if (lastSequence) { + assert(lp <= lend); + assert(litSize <= (size_t)(lend - lp)); + litSize = (size_t)(lend - lp); + } + /* I think there is an optimization opportunity here. + * Calling ZSTD_estimateSubBlockSize for every sequence can be wasteful + * since it recalculates estimate from scratch. + * For example, it would recount literal distribution and symbol codes everytime. + */ + cBlockSizeEstimate = ZSTD_estimateSubBlockSize(lp, litSize, ofCodePtr, llCodePtr, mlCodePtr, seqCount, + &nextCBlock->entropy, entropyMetadata, + workspace, wkspSize, writeLitEntropy, writeSeqEntropy); + if (cBlockSizeEstimate > targetCBlockSize || lastSequence) { + int litEntropyWritten = 0; + int seqEntropyWritten = 0; + const size_t decompressedSize = ZSTD_seqDecompressedSize(seqStorePtr, sp, seqCount, litSize, lastSequence); + const size_t cSize = ZSTD_compressSubBlock(&nextCBlock->entropy, entropyMetadata, + sp, seqCount, + lp, litSize, + llCodePtr, mlCodePtr, ofCodePtr, + cctxParams, + op, oend-op, + bmi2, writeLitEntropy, writeSeqEntropy, + &litEntropyWritten, &seqEntropyWritten, + lastBlock && lastSequence); + FORWARD_IF_ERROR(cSize, "ZSTD_compressSubBlock failed"); + if (cSize > 0 && cSize < decompressedSize) { + DEBUGLOG(5, "Committed the sub-block"); + assert(ip + decompressedSize <= iend); + ip += decompressedSize; + sp += seqCount; + lp += litSize; + op += cSize; + llCodePtr += seqCount; + mlCodePtr += seqCount; + ofCodePtr += seqCount; + litSize = 0; + seqCount = 0; + /* Entropy only needs to be written once */ + if (litEntropyWritten) { + writeLitEntropy = 0; + } + if (seqEntropyWritten) { + writeSeqEntropy = 0; + } + } + } + } while (!lastSequence); + if (writeLitEntropy) { + DEBUGLOG(5, "ZSTD_compressSubBlock_multi has literal entropy tables unwritten"); + ZSTD_memcpy(&nextCBlock->entropy.huf, &prevCBlock->entropy.huf, sizeof(prevCBlock->entropy.huf)); + } + if (writeSeqEntropy && ZSTD_needSequenceEntropyTables(&entropyMetadata->fseMetadata)) { + /* If we haven't written our entropy tables, then we've violated our contract and + * must emit an uncompressed block. + */ + DEBUGLOG(5, "ZSTD_compressSubBlock_multi has sequence entropy tables unwritten"); + return 0; + } + if (ip < iend) { + size_t const cSize = ZSTD_noCompressBlock(op, oend - op, ip, iend - ip, lastBlock); + DEBUGLOG(5, "ZSTD_compressSubBlock_multi last sub-block uncompressed, %zu bytes", (size_t)(iend - ip)); + FORWARD_IF_ERROR(cSize, "ZSTD_noCompressBlock failed"); + assert(cSize != 0); + op += cSize; + /* We have to regenerate the repcodes because we've skipped some sequences */ + if (sp < send) { + seqDef const* seq; + repcodes_t rep; + ZSTD_memcpy(&rep, prevCBlock->rep, sizeof(rep)); + for (seq = sstart; seq < sp; ++seq) { + rep = ZSTD_updateRep(rep.rep, seq->offset - 1, ZSTD_getSequenceLength(seqStorePtr, seq).litLength == 0); + } + ZSTD_memcpy(nextCBlock->rep, &rep, sizeof(rep)); + } + } + DEBUGLOG(5, "ZSTD_compressSubBlock_multi compressed"); + return op-ostart; +} + +size_t ZSTD_compressSuperBlock(ZSTD_CCtx* zc, + void* dst, size_t dstCapacity, + void const* src, size_t srcSize, + unsigned lastBlock) { + ZSTD_entropyCTablesMetadata_t entropyMetadata; + + FORWARD_IF_ERROR(ZSTD_buildBlockEntropyStats(&zc->seqStore, + &zc->blockState.prevCBlock->entropy, + &zc->blockState.nextCBlock->entropy, + &zc->appliedParams, + &entropyMetadata, + zc->entropyWorkspace, ENTROPY_WORKSPACE_SIZE /* statically allocated in resetCCtx */), ""); + + return ZSTD_compressSubBlock_multi(&zc->seqStore, + zc->blockState.prevCBlock, + zc->blockState.nextCBlock, + &entropyMetadata, + &zc->appliedParams, + dst, dstCapacity, + src, srcSize, + zc->bmi2, lastBlock, + zc->entropyWorkspace, ENTROPY_WORKSPACE_SIZE /* statically allocated in resetCCtx */); +} diff --git a/external/zstd/lib/compress/zstd_compress_superblock.h b/external/zstd/lib/compress/zstd_compress_superblock.h new file mode 100644 index 00000000..176f9b10 --- /dev/null +++ b/external/zstd/lib/compress/zstd_compress_superblock.h @@ -0,0 +1,32 @@ +/* + * Copyright (c) Yann Collet, Facebook, Inc. + * All rights reserved. + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. + */ + +#ifndef ZSTD_COMPRESS_ADVANCED_H +#define ZSTD_COMPRESS_ADVANCED_H + +/*-************************************* +* Dependencies +***************************************/ + +#include "../zstd.h" /* ZSTD_CCtx */ + +/*-************************************* +* Target Compressed Block Size +***************************************/ + +/* ZSTD_compressSuperBlock() : + * Used to compress a super block when targetCBlockSize is being used. + * The given block will be compressed into multiple sub blocks that are around targetCBlockSize. */ +size_t ZSTD_compressSuperBlock(ZSTD_CCtx* zc, + void* dst, size_t dstCapacity, + void const* src, size_t srcSize, + unsigned lastBlock); + +#endif /* ZSTD_COMPRESS_ADVANCED_H */ diff --git a/external/zstd/lib/compress/zstd_cwksp.h b/external/zstd/lib/compress/zstd_cwksp.h new file mode 100644 index 00000000..2656d26c --- /dev/null +++ b/external/zstd/lib/compress/zstd_cwksp.h @@ -0,0 +1,662 @@ +/* + * Copyright (c) Yann Collet, Facebook, Inc. + * All rights reserved. + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. + */ + +#ifndef ZSTD_CWKSP_H +#define ZSTD_CWKSP_H + +/*-************************************* +* Dependencies +***************************************/ +#include "../common/zstd_internal.h" + +#if defined (__cplusplus) +extern "C" { +#endif + +/*-************************************* +* Constants +***************************************/ + +/* Since the workspace is effectively its own little malloc implementation / + * arena, when we run under ASAN, we should similarly insert redzones between + * each internal element of the workspace, so ASAN will catch overruns that + * reach outside an object but that stay inside the workspace. + * + * This defines the size of that redzone. + */ +#ifndef ZSTD_CWKSP_ASAN_REDZONE_SIZE +#define ZSTD_CWKSP_ASAN_REDZONE_SIZE 128 +#endif + + +/* Set our tables and aligneds to align by 64 bytes */ +#define ZSTD_CWKSP_ALIGNMENT_BYTES 64 + +/*-************************************* +* Structures +***************************************/ +typedef enum { + ZSTD_cwksp_alloc_objects, + ZSTD_cwksp_alloc_buffers, + ZSTD_cwksp_alloc_aligned +} ZSTD_cwksp_alloc_phase_e; + +/** + * Used to describe whether the workspace is statically allocated (and will not + * necessarily ever be freed), or if it's dynamically allocated and we can + * expect a well-formed caller to free this. + */ +typedef enum { + ZSTD_cwksp_dynamic_alloc, + ZSTD_cwksp_static_alloc +} ZSTD_cwksp_static_alloc_e; + +/** + * Zstd fits all its internal datastructures into a single continuous buffer, + * so that it only needs to perform a single OS allocation (or so that a buffer + * can be provided to it and it can perform no allocations at all). This buffer + * is called the workspace. + * + * Several optimizations complicate that process of allocating memory ranges + * from this workspace for each internal datastructure: + * + * - These different internal datastructures have different setup requirements: + * + * - The static objects need to be cleared once and can then be trivially + * reused for each compression. + * + * - Various buffers don't need to be initialized at all--they are always + * written into before they're read. + * + * - The matchstate tables have a unique requirement that they don't need + * their memory to be totally cleared, but they do need the memory to have + * some bound, i.e., a guarantee that all values in the memory they've been + * allocated is less than some maximum value (which is the starting value + * for the indices that they will then use for compression). When this + * guarantee is provided to them, they can use the memory without any setup + * work. When it can't, they have to clear the area. + * + * - These buffers also have different alignment requirements. + * + * - We would like to reuse the objects in the workspace for multiple + * compressions without having to perform any expensive reallocation or + * reinitialization work. + * + * - We would like to be able to efficiently reuse the workspace across + * multiple compressions **even when the compression parameters change** and + * we need to resize some of the objects (where possible). + * + * To attempt to manage this buffer, given these constraints, the ZSTD_cwksp + * abstraction was created. It works as follows: + * + * Workspace Layout: + * + * [ ... workspace ... ] + * [objects][tables ... ->] free space [<- ... aligned][<- ... buffers] + * + * The various objects that live in the workspace are divided into the + * following categories, and are allocated separately: + * + * - Static objects: this is optionally the enclosing ZSTD_CCtx or ZSTD_CDict, + * so that literally everything fits in a single buffer. Note: if present, + * this must be the first object in the workspace, since ZSTD_customFree{CCtx, + * CDict}() rely on a pointer comparison to see whether one or two frees are + * required. + * + * - Fixed size objects: these are fixed-size, fixed-count objects that are + * nonetheless "dynamically" allocated in the workspace so that we can + * control how they're initialized separately from the broader ZSTD_CCtx. + * Examples: + * - Entropy Workspace + * - 2 x ZSTD_compressedBlockState_t + * - CDict dictionary contents + * + * - Tables: these are any of several different datastructures (hash tables, + * chain tables, binary trees) that all respect a common format: they are + * uint32_t arrays, all of whose values are between 0 and (nextSrc - base). + * Their sizes depend on the cparams. These tables are 64-byte aligned. + * + * - Aligned: these buffers are used for various purposes that require 4 byte + * alignment, but don't require any initialization before they're used. These + * buffers are each aligned to 64 bytes. + * + * - Buffers: these buffers are used for various purposes that don't require + * any alignment or initialization before they're used. This means they can + * be moved around at no cost for a new compression. + * + * Allocating Memory: + * + * The various types of objects must be allocated in order, so they can be + * correctly packed into the workspace buffer. That order is: + * + * 1. Objects + * 2. Buffers + * 3. Aligned/Tables + * + * Attempts to reserve objects of different types out of order will fail. + */ +typedef struct { + void* workspace; + void* workspaceEnd; + + void* objectEnd; + void* tableEnd; + void* tableValidEnd; + void* allocStart; + + BYTE allocFailed; + int workspaceOversizedDuration; + ZSTD_cwksp_alloc_phase_e phase; + ZSTD_cwksp_static_alloc_e isStatic; +} ZSTD_cwksp; + +/*-************************************* +* Functions +***************************************/ + +MEM_STATIC size_t ZSTD_cwksp_available_space(ZSTD_cwksp* ws); + +MEM_STATIC void ZSTD_cwksp_assert_internal_consistency(ZSTD_cwksp* ws) { + (void)ws; + assert(ws->workspace <= ws->objectEnd); + assert(ws->objectEnd <= ws->tableEnd); + assert(ws->objectEnd <= ws->tableValidEnd); + assert(ws->tableEnd <= ws->allocStart); + assert(ws->tableValidEnd <= ws->allocStart); + assert(ws->allocStart <= ws->workspaceEnd); +} + +/** + * Align must be a power of 2. + */ +MEM_STATIC size_t ZSTD_cwksp_align(size_t size, size_t const align) { + size_t const mask = align - 1; + assert((align & mask) == 0); + return (size + mask) & ~mask; +} + +/** + * Use this to determine how much space in the workspace we will consume to + * allocate this object. (Normally it should be exactly the size of the object, + * but under special conditions, like ASAN, where we pad each object, it might + * be larger.) + * + * Since tables aren't currently redzoned, you don't need to call through this + * to figure out how much space you need for the matchState tables. Everything + * else is though. + * + * Do not use for sizing aligned buffers. Instead, use ZSTD_cwksp_aligned_alloc_size(). + */ +MEM_STATIC size_t ZSTD_cwksp_alloc_size(size_t size) { + if (size == 0) + return 0; +#if ZSTD_ADDRESS_SANITIZER && !defined (ZSTD_ASAN_DONT_POISON_WORKSPACE) + return size + 2 * ZSTD_CWKSP_ASAN_REDZONE_SIZE; +#else + return size; +#endif +} + +/** + * Returns an adjusted alloc size that is the nearest larger multiple of 64 bytes. + * Used to determine the number of bytes required for a given "aligned". + */ +MEM_STATIC size_t ZSTD_cwksp_aligned_alloc_size(size_t size) { + return ZSTD_cwksp_alloc_size(ZSTD_cwksp_align(size, ZSTD_CWKSP_ALIGNMENT_BYTES)); +} + +/** + * Returns the amount of additional space the cwksp must allocate + * for internal purposes (currently only alignment). + */ +MEM_STATIC size_t ZSTD_cwksp_slack_space_required(void) { + /* For alignment, the wksp will always allocate an additional n_1=[1, 64] bytes + * to align the beginning of tables section, as well as another n_2=[0, 63] bytes + * to align the beginning of the aligned secion. + * + * n_1 + n_2 == 64 bytes if the cwksp is freshly allocated, due to tables and + * aligneds being sized in multiples of 64 bytes. + */ + size_t const slackSpace = ZSTD_CWKSP_ALIGNMENT_BYTES; + return slackSpace; +} + + +/** + * Return the number of additional bytes required to align a pointer to the given number of bytes. + * alignBytes must be a power of two. + */ +MEM_STATIC size_t ZSTD_cwksp_bytes_to_align_ptr(void* ptr, const size_t alignBytes) { + size_t const alignBytesMask = alignBytes - 1; + size_t const bytes = (alignBytes - ((size_t)ptr & (alignBytesMask))) & alignBytesMask; + assert((alignBytes & alignBytesMask) == 0); + assert(bytes != ZSTD_CWKSP_ALIGNMENT_BYTES); + return bytes; +} + +/** + * Internal function. Do not use directly. + * Reserves the given number of bytes within the aligned/buffer segment of the wksp, which + * counts from the end of the wksp. (as opposed to the object/table segment) + * + * Returns a pointer to the beginning of that space. + */ +MEM_STATIC void* ZSTD_cwksp_reserve_internal_buffer_space(ZSTD_cwksp* ws, size_t const bytes) { + void* const alloc = (BYTE*)ws->allocStart - bytes; + void* const bottom = ws->tableEnd; + DEBUGLOG(5, "cwksp: reserving %p %zd bytes, %zd bytes remaining", + alloc, bytes, ZSTD_cwksp_available_space(ws) - bytes); + ZSTD_cwksp_assert_internal_consistency(ws); + assert(alloc >= bottom); + if (alloc < bottom) { + DEBUGLOG(4, "cwksp: alloc failed!"); + ws->allocFailed = 1; + return NULL; + } + if (alloc < ws->tableValidEnd) { + ws->tableValidEnd = alloc; + } + ws->allocStart = alloc; + return alloc; +} + +/** + * Moves the cwksp to the next phase, and does any necessary allocations. + * Returns a 0 on success, or zstd error + */ +MEM_STATIC size_t ZSTD_cwksp_internal_advance_phase( + ZSTD_cwksp* ws, ZSTD_cwksp_alloc_phase_e phase) { + assert(phase >= ws->phase); + if (phase > ws->phase) { + /* Going from allocating objects to allocating buffers */ + if (ws->phase < ZSTD_cwksp_alloc_buffers && + phase >= ZSTD_cwksp_alloc_buffers) { + ws->tableValidEnd = ws->objectEnd; + } + + /* Going from allocating buffers to allocating aligneds/tables */ + if (ws->phase < ZSTD_cwksp_alloc_aligned && + phase >= ZSTD_cwksp_alloc_aligned) { + { /* Align the start of the "aligned" to 64 bytes. Use [1, 64] bytes. */ + size_t const bytesToAlign = + ZSTD_CWKSP_ALIGNMENT_BYTES - ZSTD_cwksp_bytes_to_align_ptr(ws->allocStart, ZSTD_CWKSP_ALIGNMENT_BYTES); + DEBUGLOG(5, "reserving aligned alignment addtl space: %zu", bytesToAlign); + ZSTD_STATIC_ASSERT((ZSTD_CWKSP_ALIGNMENT_BYTES & (ZSTD_CWKSP_ALIGNMENT_BYTES - 1)) == 0); /* power of 2 */ + RETURN_ERROR_IF(!ZSTD_cwksp_reserve_internal_buffer_space(ws, bytesToAlign), + memory_allocation, "aligned phase - alignment initial allocation failed!"); + } + { /* Align the start of the tables to 64 bytes. Use [0, 63] bytes */ + void* const alloc = ws->objectEnd; + size_t const bytesToAlign = ZSTD_cwksp_bytes_to_align_ptr(alloc, ZSTD_CWKSP_ALIGNMENT_BYTES); + void* const end = (BYTE*)alloc + bytesToAlign; + DEBUGLOG(5, "reserving table alignment addtl space: %zu", bytesToAlign); + RETURN_ERROR_IF(end > ws->workspaceEnd, memory_allocation, + "table phase - alignment initial allocation failed!"); + ws->objectEnd = end; + ws->tableEnd = end; + ws->tableValidEnd = end; + } + } + ws->phase = phase; + ZSTD_cwksp_assert_internal_consistency(ws); + } + return 0; +} + +/** + * Returns whether this object/buffer/etc was allocated in this workspace. + */ +MEM_STATIC int ZSTD_cwksp_owns_buffer(const ZSTD_cwksp* ws, const void* ptr) { + return (ptr != NULL) && (ws->workspace <= ptr) && (ptr <= ws->workspaceEnd); +} + +/** + * Internal function. Do not use directly. + */ +MEM_STATIC void* ZSTD_cwksp_reserve_internal( + ZSTD_cwksp* ws, size_t bytes, ZSTD_cwksp_alloc_phase_e phase) { + void* alloc; + if (ZSTD_isError(ZSTD_cwksp_internal_advance_phase(ws, phase)) || bytes == 0) { + return NULL; + } + +#if ZSTD_ADDRESS_SANITIZER && !defined (ZSTD_ASAN_DONT_POISON_WORKSPACE) + /* over-reserve space */ + bytes += 2 * ZSTD_CWKSP_ASAN_REDZONE_SIZE; +#endif + + alloc = ZSTD_cwksp_reserve_internal_buffer_space(ws, bytes); + +#if ZSTD_ADDRESS_SANITIZER && !defined (ZSTD_ASAN_DONT_POISON_WORKSPACE) + /* Move alloc so there's ZSTD_CWKSP_ASAN_REDZONE_SIZE unused space on + * either size. */ + if (alloc) { + alloc = (BYTE *)alloc + ZSTD_CWKSP_ASAN_REDZONE_SIZE; + if (ws->isStatic == ZSTD_cwksp_dynamic_alloc) { + __asan_unpoison_memory_region(alloc, bytes); + } + } +#endif + + return alloc; +} + +/** + * Reserves and returns unaligned memory. + */ +MEM_STATIC BYTE* ZSTD_cwksp_reserve_buffer(ZSTD_cwksp* ws, size_t bytes) { + return (BYTE*)ZSTD_cwksp_reserve_internal(ws, bytes, ZSTD_cwksp_alloc_buffers); +} + +/** + * Reserves and returns memory sized on and aligned on ZSTD_CWKSP_ALIGNMENT_BYTES (64 bytes). + */ +MEM_STATIC void* ZSTD_cwksp_reserve_aligned(ZSTD_cwksp* ws, size_t bytes) { + void* ptr = ZSTD_cwksp_reserve_internal(ws, ZSTD_cwksp_align(bytes, ZSTD_CWKSP_ALIGNMENT_BYTES), + ZSTD_cwksp_alloc_aligned); + assert(((size_t)ptr & (ZSTD_CWKSP_ALIGNMENT_BYTES-1))== 0); + return ptr; +} + +/** + * Aligned on 64 bytes. These buffers have the special property that + * their values remain constrained, allowing us to re-use them without + * memset()-ing them. + */ +MEM_STATIC void* ZSTD_cwksp_reserve_table(ZSTD_cwksp* ws, size_t bytes) { + const ZSTD_cwksp_alloc_phase_e phase = ZSTD_cwksp_alloc_aligned; + void* alloc; + void* end; + void* top; + + if (ZSTD_isError(ZSTD_cwksp_internal_advance_phase(ws, phase))) { + return NULL; + } + alloc = ws->tableEnd; + end = (BYTE *)alloc + bytes; + top = ws->allocStart; + + DEBUGLOG(5, "cwksp: reserving %p table %zd bytes, %zd bytes remaining", + alloc, bytes, ZSTD_cwksp_available_space(ws) - bytes); + assert((bytes & (sizeof(U32)-1)) == 0); + ZSTD_cwksp_assert_internal_consistency(ws); + assert(end <= top); + if (end > top) { + DEBUGLOG(4, "cwksp: table alloc failed!"); + ws->allocFailed = 1; + return NULL; + } + ws->tableEnd = end; + +#if ZSTD_ADDRESS_SANITIZER && !defined (ZSTD_ASAN_DONT_POISON_WORKSPACE) + if (ws->isStatic == ZSTD_cwksp_dynamic_alloc) { + __asan_unpoison_memory_region(alloc, bytes); + } +#endif + + assert((bytes & (ZSTD_CWKSP_ALIGNMENT_BYTES-1)) == 0); + assert(((size_t)alloc & (ZSTD_CWKSP_ALIGNMENT_BYTES-1))== 0); + return alloc; +} + +/** + * Aligned on sizeof(void*). + */ +MEM_STATIC void* ZSTD_cwksp_reserve_object(ZSTD_cwksp* ws, size_t bytes) { + size_t roundedBytes = ZSTD_cwksp_align(bytes, sizeof(void*)); + void* alloc = ws->objectEnd; + void* end = (BYTE*)alloc + roundedBytes; + +#if ZSTD_ADDRESS_SANITIZER && !defined (ZSTD_ASAN_DONT_POISON_WORKSPACE) + /* over-reserve space */ + end = (BYTE *)end + 2 * ZSTD_CWKSP_ASAN_REDZONE_SIZE; +#endif + + DEBUGLOG(5, + "cwksp: reserving %p object %zd bytes (rounded to %zd), %zd bytes remaining", + alloc, bytes, roundedBytes, ZSTD_cwksp_available_space(ws) - roundedBytes); + assert(((size_t)alloc & (sizeof(void*)-1)) == 0); + assert((bytes & (sizeof(void*)-1)) == 0); + ZSTD_cwksp_assert_internal_consistency(ws); + /* we must be in the first phase, no advance is possible */ + if (ws->phase != ZSTD_cwksp_alloc_objects || end > ws->workspaceEnd) { + DEBUGLOG(4, "cwksp: object alloc failed!"); + ws->allocFailed = 1; + return NULL; + } + ws->objectEnd = end; + ws->tableEnd = end; + ws->tableValidEnd = end; + +#if ZSTD_ADDRESS_SANITIZER && !defined (ZSTD_ASAN_DONT_POISON_WORKSPACE) + /* Move alloc so there's ZSTD_CWKSP_ASAN_REDZONE_SIZE unused space on + * either size. */ + alloc = (BYTE *)alloc + ZSTD_CWKSP_ASAN_REDZONE_SIZE; + if (ws->isStatic == ZSTD_cwksp_dynamic_alloc) { + __asan_unpoison_memory_region(alloc, bytes); + } +#endif + + return alloc; +} + +MEM_STATIC void ZSTD_cwksp_mark_tables_dirty(ZSTD_cwksp* ws) { + DEBUGLOG(4, "cwksp: ZSTD_cwksp_mark_tables_dirty"); + +#if ZSTD_MEMORY_SANITIZER && !defined (ZSTD_MSAN_DONT_POISON_WORKSPACE) + /* To validate that the table re-use logic is sound, and that we don't + * access table space that we haven't cleaned, we re-"poison" the table + * space every time we mark it dirty. */ + { + size_t size = (BYTE*)ws->tableValidEnd - (BYTE*)ws->objectEnd; + assert(__msan_test_shadow(ws->objectEnd, size) == -1); + __msan_poison(ws->objectEnd, size); + } +#endif + + assert(ws->tableValidEnd >= ws->objectEnd); + assert(ws->tableValidEnd <= ws->allocStart); + ws->tableValidEnd = ws->objectEnd; + ZSTD_cwksp_assert_internal_consistency(ws); +} + +MEM_STATIC void ZSTD_cwksp_mark_tables_clean(ZSTD_cwksp* ws) { + DEBUGLOG(4, "cwksp: ZSTD_cwksp_mark_tables_clean"); + assert(ws->tableValidEnd >= ws->objectEnd); + assert(ws->tableValidEnd <= ws->allocStart); + if (ws->tableValidEnd < ws->tableEnd) { + ws->tableValidEnd = ws->tableEnd; + } + ZSTD_cwksp_assert_internal_consistency(ws); +} + +/** + * Zero the part of the allocated tables not already marked clean. + */ +MEM_STATIC void ZSTD_cwksp_clean_tables(ZSTD_cwksp* ws) { + DEBUGLOG(4, "cwksp: ZSTD_cwksp_clean_tables"); + assert(ws->tableValidEnd >= ws->objectEnd); + assert(ws->tableValidEnd <= ws->allocStart); + if (ws->tableValidEnd < ws->tableEnd) { + ZSTD_memset(ws->tableValidEnd, 0, (BYTE*)ws->tableEnd - (BYTE*)ws->tableValidEnd); + } + ZSTD_cwksp_mark_tables_clean(ws); +} + +/** + * Invalidates table allocations. + * All other allocations remain valid. + */ +MEM_STATIC void ZSTD_cwksp_clear_tables(ZSTD_cwksp* ws) { + DEBUGLOG(4, "cwksp: clearing tables!"); + +#if ZSTD_ADDRESS_SANITIZER && !defined (ZSTD_ASAN_DONT_POISON_WORKSPACE) + /* We don't do this when the workspace is statically allocated, because + * when that is the case, we have no capability to hook into the end of the + * workspace's lifecycle to unpoison the memory. + */ + if (ws->isStatic == ZSTD_cwksp_dynamic_alloc) { + size_t size = (BYTE*)ws->tableValidEnd - (BYTE*)ws->objectEnd; + __asan_poison_memory_region(ws->objectEnd, size); + } +#endif + + ws->tableEnd = ws->objectEnd; + ZSTD_cwksp_assert_internal_consistency(ws); +} + +/** + * Invalidates all buffer, aligned, and table allocations. + * Object allocations remain valid. + */ +MEM_STATIC void ZSTD_cwksp_clear(ZSTD_cwksp* ws) { + DEBUGLOG(4, "cwksp: clearing!"); + +#if ZSTD_MEMORY_SANITIZER && !defined (ZSTD_MSAN_DONT_POISON_WORKSPACE) + /* To validate that the context re-use logic is sound, and that we don't + * access stuff that this compression hasn't initialized, we re-"poison" + * the workspace (or at least the non-static, non-table parts of it) + * every time we start a new compression. */ + { + size_t size = (BYTE*)ws->workspaceEnd - (BYTE*)ws->tableValidEnd; + __msan_poison(ws->tableValidEnd, size); + } +#endif + +#if ZSTD_ADDRESS_SANITIZER && !defined (ZSTD_ASAN_DONT_POISON_WORKSPACE) + /* We don't do this when the workspace is statically allocated, because + * when that is the case, we have no capability to hook into the end of the + * workspace's lifecycle to unpoison the memory. + */ + if (ws->isStatic == ZSTD_cwksp_dynamic_alloc) { + size_t size = (BYTE*)ws->workspaceEnd - (BYTE*)ws->objectEnd; + __asan_poison_memory_region(ws->objectEnd, size); + } +#endif + + ws->tableEnd = ws->objectEnd; + ws->allocStart = ws->workspaceEnd; + ws->allocFailed = 0; + if (ws->phase > ZSTD_cwksp_alloc_buffers) { + ws->phase = ZSTD_cwksp_alloc_buffers; + } + ZSTD_cwksp_assert_internal_consistency(ws); +} + +/** + * The provided workspace takes ownership of the buffer [start, start+size). + * Any existing values in the workspace are ignored (the previously managed + * buffer, if present, must be separately freed). + */ +MEM_STATIC void ZSTD_cwksp_init(ZSTD_cwksp* ws, void* start, size_t size, ZSTD_cwksp_static_alloc_e isStatic) { + DEBUGLOG(4, "cwksp: init'ing workspace with %zd bytes", size); + assert(((size_t)start & (sizeof(void*)-1)) == 0); /* ensure correct alignment */ + ws->workspace = start; + ws->workspaceEnd = (BYTE*)start + size; + ws->objectEnd = ws->workspace; + ws->tableValidEnd = ws->objectEnd; + ws->phase = ZSTD_cwksp_alloc_objects; + ws->isStatic = isStatic; + ZSTD_cwksp_clear(ws); + ws->workspaceOversizedDuration = 0; + ZSTD_cwksp_assert_internal_consistency(ws); +} + +MEM_STATIC size_t ZSTD_cwksp_create(ZSTD_cwksp* ws, size_t size, ZSTD_customMem customMem) { + void* workspace = ZSTD_customMalloc(size, customMem); + DEBUGLOG(4, "cwksp: creating new workspace with %zd bytes", size); + RETURN_ERROR_IF(workspace == NULL, memory_allocation, "NULL pointer!"); + ZSTD_cwksp_init(ws, workspace, size, ZSTD_cwksp_dynamic_alloc); + return 0; +} + +MEM_STATIC void ZSTD_cwksp_free(ZSTD_cwksp* ws, ZSTD_customMem customMem) { + void *ptr = ws->workspace; + DEBUGLOG(4, "cwksp: freeing workspace"); + ZSTD_memset(ws, 0, sizeof(ZSTD_cwksp)); + ZSTD_customFree(ptr, customMem); +} + +/** + * Moves the management of a workspace from one cwksp to another. The src cwksp + * is left in an invalid state (src must be re-init()'ed before it's used again). + */ +MEM_STATIC void ZSTD_cwksp_move(ZSTD_cwksp* dst, ZSTD_cwksp* src) { + *dst = *src; + ZSTD_memset(src, 0, sizeof(ZSTD_cwksp)); +} + +MEM_STATIC size_t ZSTD_cwksp_sizeof(const ZSTD_cwksp* ws) { + return (size_t)((BYTE*)ws->workspaceEnd - (BYTE*)ws->workspace); +} + +MEM_STATIC size_t ZSTD_cwksp_used(const ZSTD_cwksp* ws) { + return (size_t)((BYTE*)ws->tableEnd - (BYTE*)ws->workspace) + + (size_t)((BYTE*)ws->workspaceEnd - (BYTE*)ws->allocStart); +} + +MEM_STATIC int ZSTD_cwksp_reserve_failed(const ZSTD_cwksp* ws) { + return ws->allocFailed; +} + +/*-************************************* +* Functions Checking Free Space +***************************************/ + +/* ZSTD_alignmentSpaceWithinBounds() : + * Returns if the estimated space needed for a wksp is within an acceptable limit of the + * actual amount of space used. + */ +MEM_STATIC int ZSTD_cwksp_estimated_space_within_bounds(const ZSTD_cwksp* const ws, + size_t const estimatedSpace, int resizedWorkspace) { + if (resizedWorkspace) { + /* Resized/newly allocated wksp should have exact bounds */ + return ZSTD_cwksp_used(ws) == estimatedSpace; + } else { + /* Due to alignment, when reusing a workspace, we can actually consume 63 fewer or more bytes + * than estimatedSpace. See the comments in zstd_cwksp.h for details. + */ + return (ZSTD_cwksp_used(ws) >= estimatedSpace - 63) && (ZSTD_cwksp_used(ws) <= estimatedSpace + 63); + } +} + + +MEM_STATIC size_t ZSTD_cwksp_available_space(ZSTD_cwksp* ws) { + return (size_t)((BYTE*)ws->allocStart - (BYTE*)ws->tableEnd); +} + +MEM_STATIC int ZSTD_cwksp_check_available(ZSTD_cwksp* ws, size_t additionalNeededSpace) { + return ZSTD_cwksp_available_space(ws) >= additionalNeededSpace; +} + +MEM_STATIC int ZSTD_cwksp_check_too_large(ZSTD_cwksp* ws, size_t additionalNeededSpace) { + return ZSTD_cwksp_check_available( + ws, additionalNeededSpace * ZSTD_WORKSPACETOOLARGE_FACTOR); +} + +MEM_STATIC int ZSTD_cwksp_check_wasteful(ZSTD_cwksp* ws, size_t additionalNeededSpace) { + return ZSTD_cwksp_check_too_large(ws, additionalNeededSpace) + && ws->workspaceOversizedDuration > ZSTD_WORKSPACETOOLARGE_MAXDURATION; +} + +MEM_STATIC void ZSTD_cwksp_bump_oversized_duration( + ZSTD_cwksp* ws, size_t additionalNeededSpace) { + if (ZSTD_cwksp_check_too_large(ws, additionalNeededSpace)) { + ws->workspaceOversizedDuration++; + } else { + ws->workspaceOversizedDuration = 0; + } +} + +#if defined (__cplusplus) +} +#endif + +#endif /* ZSTD_CWKSP_H */ diff --git a/external/zstd/lib/compress/zstd_double_fast.c b/external/zstd/lib/compress/zstd_double_fast.c new file mode 100644 index 00000000..d0d3a784 --- /dev/null +++ b/external/zstd/lib/compress/zstd_double_fast.c @@ -0,0 +1,521 @@ +/* + * Copyright (c) Yann Collet, Facebook, Inc. + * All rights reserved. + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. + */ + +#include "zstd_compress_internal.h" +#include "zstd_double_fast.h" + + +void ZSTD_fillDoubleHashTable(ZSTD_matchState_t* ms, + void const* end, ZSTD_dictTableLoadMethod_e dtlm) +{ + const ZSTD_compressionParameters* const cParams = &ms->cParams; + U32* const hashLarge = ms->hashTable; + U32 const hBitsL = cParams->hashLog; + U32 const mls = cParams->minMatch; + U32* const hashSmall = ms->chainTable; + U32 const hBitsS = cParams->chainLog; + const BYTE* const base = ms->window.base; + const BYTE* ip = base + ms->nextToUpdate; + const BYTE* const iend = ((const BYTE*)end) - HASH_READ_SIZE; + const U32 fastHashFillStep = 3; + + /* Always insert every fastHashFillStep position into the hash tables. + * Insert the other positions into the large hash table if their entry + * is empty. + */ + for (; ip + fastHashFillStep - 1 <= iend; ip += fastHashFillStep) { + U32 const curr = (U32)(ip - base); + U32 i; + for (i = 0; i < fastHashFillStep; ++i) { + size_t const smHash = ZSTD_hashPtr(ip + i, hBitsS, mls); + size_t const lgHash = ZSTD_hashPtr(ip + i, hBitsL, 8); + if (i == 0) + hashSmall[smHash] = curr + i; + if (i == 0 || hashLarge[lgHash] == 0) + hashLarge[lgHash] = curr + i; + /* Only load extra positions for ZSTD_dtlm_full */ + if (dtlm == ZSTD_dtlm_fast) + break; + } } +} + + +FORCE_INLINE_TEMPLATE +size_t ZSTD_compressBlock_doubleFast_generic( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize, + U32 const mls /* template */, ZSTD_dictMode_e const dictMode) +{ + ZSTD_compressionParameters const* cParams = &ms->cParams; + U32* const hashLong = ms->hashTable; + const U32 hBitsL = cParams->hashLog; + U32* const hashSmall = ms->chainTable; + const U32 hBitsS = cParams->chainLog; + const BYTE* const base = ms->window.base; + const BYTE* const istart = (const BYTE*)src; + const BYTE* ip = istart; + const BYTE* anchor = istart; + const U32 endIndex = (U32)((size_t)(istart - base) + srcSize); + /* presumes that, if there is a dictionary, it must be using Attach mode */ + const U32 prefixLowestIndex = ZSTD_getLowestPrefixIndex(ms, endIndex, cParams->windowLog); + const BYTE* const prefixLowest = base + prefixLowestIndex; + const BYTE* const iend = istart + srcSize; + const BYTE* const ilimit = iend - HASH_READ_SIZE; + U32 offset_1=rep[0], offset_2=rep[1]; + U32 offsetSaved = 0; + + const ZSTD_matchState_t* const dms = ms->dictMatchState; + const ZSTD_compressionParameters* const dictCParams = + dictMode == ZSTD_dictMatchState ? + &dms->cParams : NULL; + const U32* const dictHashLong = dictMode == ZSTD_dictMatchState ? + dms->hashTable : NULL; + const U32* const dictHashSmall = dictMode == ZSTD_dictMatchState ? + dms->chainTable : NULL; + const U32 dictStartIndex = dictMode == ZSTD_dictMatchState ? + dms->window.dictLimit : 0; + const BYTE* const dictBase = dictMode == ZSTD_dictMatchState ? + dms->window.base : NULL; + const BYTE* const dictStart = dictMode == ZSTD_dictMatchState ? + dictBase + dictStartIndex : NULL; + const BYTE* const dictEnd = dictMode == ZSTD_dictMatchState ? + dms->window.nextSrc : NULL; + const U32 dictIndexDelta = dictMode == ZSTD_dictMatchState ? + prefixLowestIndex - (U32)(dictEnd - dictBase) : + 0; + const U32 dictHBitsL = dictMode == ZSTD_dictMatchState ? + dictCParams->hashLog : hBitsL; + const U32 dictHBitsS = dictMode == ZSTD_dictMatchState ? + dictCParams->chainLog : hBitsS; + const U32 dictAndPrefixLength = (U32)((ip - prefixLowest) + (dictEnd - dictStart)); + + DEBUGLOG(5, "ZSTD_compressBlock_doubleFast_generic"); + + assert(dictMode == ZSTD_noDict || dictMode == ZSTD_dictMatchState); + + /* if a dictionary is attached, it must be within window range */ + if (dictMode == ZSTD_dictMatchState) { + assert(ms->window.dictLimit + (1U << cParams->windowLog) >= endIndex); + } + + /* init */ + ip += (dictAndPrefixLength == 0); + if (dictMode == ZSTD_noDict) { + U32 const curr = (U32)(ip - base); + U32 const windowLow = ZSTD_getLowestPrefixIndex(ms, curr, cParams->windowLog); + U32 const maxRep = curr - windowLow; + if (offset_2 > maxRep) offsetSaved = offset_2, offset_2 = 0; + if (offset_1 > maxRep) offsetSaved = offset_1, offset_1 = 0; + } + if (dictMode == ZSTD_dictMatchState) { + /* dictMatchState repCode checks don't currently handle repCode == 0 + * disabling. */ + assert(offset_1 <= dictAndPrefixLength); + assert(offset_2 <= dictAndPrefixLength); + } + + /* Main Search Loop */ + while (ip < ilimit) { /* < instead of <=, because repcode check at (ip+1) */ + size_t mLength; + U32 offset; + size_t const h2 = ZSTD_hashPtr(ip, hBitsL, 8); + size_t const h = ZSTD_hashPtr(ip, hBitsS, mls); + size_t const dictHL = ZSTD_hashPtr(ip, dictHBitsL, 8); + size_t const dictHS = ZSTD_hashPtr(ip, dictHBitsS, mls); + U32 const curr = (U32)(ip-base); + U32 const matchIndexL = hashLong[h2]; + U32 matchIndexS = hashSmall[h]; + const BYTE* matchLong = base + matchIndexL; + const BYTE* match = base + matchIndexS; + const U32 repIndex = curr + 1 - offset_1; + const BYTE* repMatch = (dictMode == ZSTD_dictMatchState + && repIndex < prefixLowestIndex) ? + dictBase + (repIndex - dictIndexDelta) : + base + repIndex; + hashLong[h2] = hashSmall[h] = curr; /* update hash tables */ + + /* check dictMatchState repcode */ + if (dictMode == ZSTD_dictMatchState + && ((U32)((prefixLowestIndex-1) - repIndex) >= 3 /* intentional underflow */) + && (MEM_read32(repMatch) == MEM_read32(ip+1)) ) { + const BYTE* repMatchEnd = repIndex < prefixLowestIndex ? dictEnd : iend; + mLength = ZSTD_count_2segments(ip+1+4, repMatch+4, iend, repMatchEnd, prefixLowest) + 4; + ip++; + ZSTD_storeSeq(seqStore, (size_t)(ip-anchor), anchor, iend, 0, mLength-MINMATCH); + goto _match_stored; + } + + /* check noDict repcode */ + if ( dictMode == ZSTD_noDict + && ((offset_1 > 0) & (MEM_read32(ip+1-offset_1) == MEM_read32(ip+1)))) { + mLength = ZSTD_count(ip+1+4, ip+1+4-offset_1, iend) + 4; + ip++; + ZSTD_storeSeq(seqStore, (size_t)(ip-anchor), anchor, iend, 0, mLength-MINMATCH); + goto _match_stored; + } + + if (matchIndexL > prefixLowestIndex) { + /* check prefix long match */ + if (MEM_read64(matchLong) == MEM_read64(ip)) { + mLength = ZSTD_count(ip+8, matchLong+8, iend) + 8; + offset = (U32)(ip-matchLong); + while (((ip>anchor) & (matchLong>prefixLowest)) && (ip[-1] == matchLong[-1])) { ip--; matchLong--; mLength++; } /* catch up */ + goto _match_found; + } + } else if (dictMode == ZSTD_dictMatchState) { + /* check dictMatchState long match */ + U32 const dictMatchIndexL = dictHashLong[dictHL]; + const BYTE* dictMatchL = dictBase + dictMatchIndexL; + assert(dictMatchL < dictEnd); + + if (dictMatchL > dictStart && MEM_read64(dictMatchL) == MEM_read64(ip)) { + mLength = ZSTD_count_2segments(ip+8, dictMatchL+8, iend, dictEnd, prefixLowest) + 8; + offset = (U32)(curr - dictMatchIndexL - dictIndexDelta); + while (((ip>anchor) & (dictMatchL>dictStart)) && (ip[-1] == dictMatchL[-1])) { ip--; dictMatchL--; mLength++; } /* catch up */ + goto _match_found; + } } + + if (matchIndexS > prefixLowestIndex) { + /* check prefix short match */ + if (MEM_read32(match) == MEM_read32(ip)) { + goto _search_next_long; + } + } else if (dictMode == ZSTD_dictMatchState) { + /* check dictMatchState short match */ + U32 const dictMatchIndexS = dictHashSmall[dictHS]; + match = dictBase + dictMatchIndexS; + matchIndexS = dictMatchIndexS + dictIndexDelta; + + if (match > dictStart && MEM_read32(match) == MEM_read32(ip)) { + goto _search_next_long; + } } + + ip += ((ip-anchor) >> kSearchStrength) + 1; +#if defined(__aarch64__) + PREFETCH_L1(ip+256); +#endif + continue; + +_search_next_long: + + { size_t const hl3 = ZSTD_hashPtr(ip+1, hBitsL, 8); + size_t const dictHLNext = ZSTD_hashPtr(ip+1, dictHBitsL, 8); + U32 const matchIndexL3 = hashLong[hl3]; + const BYTE* matchL3 = base + matchIndexL3; + hashLong[hl3] = curr + 1; + + /* check prefix long +1 match */ + if (matchIndexL3 > prefixLowestIndex) { + if (MEM_read64(matchL3) == MEM_read64(ip+1)) { + mLength = ZSTD_count(ip+9, matchL3+8, iend) + 8; + ip++; + offset = (U32)(ip-matchL3); + while (((ip>anchor) & (matchL3>prefixLowest)) && (ip[-1] == matchL3[-1])) { ip--; matchL3--; mLength++; } /* catch up */ + goto _match_found; + } + } else if (dictMode == ZSTD_dictMatchState) { + /* check dict long +1 match */ + U32 const dictMatchIndexL3 = dictHashLong[dictHLNext]; + const BYTE* dictMatchL3 = dictBase + dictMatchIndexL3; + assert(dictMatchL3 < dictEnd); + if (dictMatchL3 > dictStart && MEM_read64(dictMatchL3) == MEM_read64(ip+1)) { + mLength = ZSTD_count_2segments(ip+1+8, dictMatchL3+8, iend, dictEnd, prefixLowest) + 8; + ip++; + offset = (U32)(curr + 1 - dictMatchIndexL3 - dictIndexDelta); + while (((ip>anchor) & (dictMatchL3>dictStart)) && (ip[-1] == dictMatchL3[-1])) { ip--; dictMatchL3--; mLength++; } /* catch up */ + goto _match_found; + } } } + + /* if no long +1 match, explore the short match we found */ + if (dictMode == ZSTD_dictMatchState && matchIndexS < prefixLowestIndex) { + mLength = ZSTD_count_2segments(ip+4, match+4, iend, dictEnd, prefixLowest) + 4; + offset = (U32)(curr - matchIndexS); + while (((ip>anchor) & (match>dictStart)) && (ip[-1] == match[-1])) { ip--; match--; mLength++; } /* catch up */ + } else { + mLength = ZSTD_count(ip+4, match+4, iend) + 4; + offset = (U32)(ip - match); + while (((ip>anchor) & (match>prefixLowest)) && (ip[-1] == match[-1])) { ip--; match--; mLength++; } /* catch up */ + } + + /* fall-through */ + +_match_found: + offset_2 = offset_1; + offset_1 = offset; + + ZSTD_storeSeq(seqStore, (size_t)(ip-anchor), anchor, iend, offset + ZSTD_REP_MOVE, mLength-MINMATCH); + +_match_stored: + /* match found */ + ip += mLength; + anchor = ip; + + if (ip <= ilimit) { + /* Complementary insertion */ + /* done after iLimit test, as candidates could be > iend-8 */ + { U32 const indexToInsert = curr+2; + hashLong[ZSTD_hashPtr(base+indexToInsert, hBitsL, 8)] = indexToInsert; + hashLong[ZSTD_hashPtr(ip-2, hBitsL, 8)] = (U32)(ip-2-base); + hashSmall[ZSTD_hashPtr(base+indexToInsert, hBitsS, mls)] = indexToInsert; + hashSmall[ZSTD_hashPtr(ip-1, hBitsS, mls)] = (U32)(ip-1-base); + } + + /* check immediate repcode */ + if (dictMode == ZSTD_dictMatchState) { + while (ip <= ilimit) { + U32 const current2 = (U32)(ip-base); + U32 const repIndex2 = current2 - offset_2; + const BYTE* repMatch2 = dictMode == ZSTD_dictMatchState + && repIndex2 < prefixLowestIndex ? + dictBase + repIndex2 - dictIndexDelta : + base + repIndex2; + if ( ((U32)((prefixLowestIndex-1) - (U32)repIndex2) >= 3 /* intentional overflow */) + && (MEM_read32(repMatch2) == MEM_read32(ip)) ) { + const BYTE* const repEnd2 = repIndex2 < prefixLowestIndex ? dictEnd : iend; + size_t const repLength2 = ZSTD_count_2segments(ip+4, repMatch2+4, iend, repEnd2, prefixLowest) + 4; + U32 tmpOffset = offset_2; offset_2 = offset_1; offset_1 = tmpOffset; /* swap offset_2 <=> offset_1 */ + ZSTD_storeSeq(seqStore, 0, anchor, iend, 0, repLength2-MINMATCH); + hashSmall[ZSTD_hashPtr(ip, hBitsS, mls)] = current2; + hashLong[ZSTD_hashPtr(ip, hBitsL, 8)] = current2; + ip += repLength2; + anchor = ip; + continue; + } + break; + } } + + if (dictMode == ZSTD_noDict) { + while ( (ip <= ilimit) + && ( (offset_2>0) + & (MEM_read32(ip) == MEM_read32(ip - offset_2)) )) { + /* store sequence */ + size_t const rLength = ZSTD_count(ip+4, ip+4-offset_2, iend) + 4; + U32 const tmpOff = offset_2; offset_2 = offset_1; offset_1 = tmpOff; /* swap offset_2 <=> offset_1 */ + hashSmall[ZSTD_hashPtr(ip, hBitsS, mls)] = (U32)(ip-base); + hashLong[ZSTD_hashPtr(ip, hBitsL, 8)] = (U32)(ip-base); + ZSTD_storeSeq(seqStore, 0, anchor, iend, 0, rLength-MINMATCH); + ip += rLength; + anchor = ip; + continue; /* faster when present ... (?) */ + } } } + } /* while (ip < ilimit) */ + + /* save reps for next block */ + rep[0] = offset_1 ? offset_1 : offsetSaved; + rep[1] = offset_2 ? offset_2 : offsetSaved; + + /* Return the last literals size */ + return (size_t)(iend - anchor); +} + + +size_t ZSTD_compressBlock_doubleFast( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize) +{ + const U32 mls = ms->cParams.minMatch; + switch(mls) + { + default: /* includes case 3 */ + case 4 : + return ZSTD_compressBlock_doubleFast_generic(ms, seqStore, rep, src, srcSize, 4, ZSTD_noDict); + case 5 : + return ZSTD_compressBlock_doubleFast_generic(ms, seqStore, rep, src, srcSize, 5, ZSTD_noDict); + case 6 : + return ZSTD_compressBlock_doubleFast_generic(ms, seqStore, rep, src, srcSize, 6, ZSTD_noDict); + case 7 : + return ZSTD_compressBlock_doubleFast_generic(ms, seqStore, rep, src, srcSize, 7, ZSTD_noDict); + } +} + + +size_t ZSTD_compressBlock_doubleFast_dictMatchState( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize) +{ + const U32 mls = ms->cParams.minMatch; + switch(mls) + { + default: /* includes case 3 */ + case 4 : + return ZSTD_compressBlock_doubleFast_generic(ms, seqStore, rep, src, srcSize, 4, ZSTD_dictMatchState); + case 5 : + return ZSTD_compressBlock_doubleFast_generic(ms, seqStore, rep, src, srcSize, 5, ZSTD_dictMatchState); + case 6 : + return ZSTD_compressBlock_doubleFast_generic(ms, seqStore, rep, src, srcSize, 6, ZSTD_dictMatchState); + case 7 : + return ZSTD_compressBlock_doubleFast_generic(ms, seqStore, rep, src, srcSize, 7, ZSTD_dictMatchState); + } +} + + +static size_t ZSTD_compressBlock_doubleFast_extDict_generic( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize, + U32 const mls /* template */) +{ + ZSTD_compressionParameters const* cParams = &ms->cParams; + U32* const hashLong = ms->hashTable; + U32 const hBitsL = cParams->hashLog; + U32* const hashSmall = ms->chainTable; + U32 const hBitsS = cParams->chainLog; + const BYTE* const istart = (const BYTE*)src; + const BYTE* ip = istart; + const BYTE* anchor = istart; + const BYTE* const iend = istart + srcSize; + const BYTE* const ilimit = iend - 8; + const BYTE* const base = ms->window.base; + const U32 endIndex = (U32)((size_t)(istart - base) + srcSize); + const U32 lowLimit = ZSTD_getLowestMatchIndex(ms, endIndex, cParams->windowLog); + const U32 dictStartIndex = lowLimit; + const U32 dictLimit = ms->window.dictLimit; + const U32 prefixStartIndex = (dictLimit > lowLimit) ? dictLimit : lowLimit; + const BYTE* const prefixStart = base + prefixStartIndex; + const BYTE* const dictBase = ms->window.dictBase; + const BYTE* const dictStart = dictBase + dictStartIndex; + const BYTE* const dictEnd = dictBase + prefixStartIndex; + U32 offset_1=rep[0], offset_2=rep[1]; + + DEBUGLOG(5, "ZSTD_compressBlock_doubleFast_extDict_generic (srcSize=%zu)", srcSize); + + /* if extDict is invalidated due to maxDistance, switch to "regular" variant */ + if (prefixStartIndex == dictStartIndex) + return ZSTD_compressBlock_doubleFast_generic(ms, seqStore, rep, src, srcSize, mls, ZSTD_noDict); + + /* Search Loop */ + while (ip < ilimit) { /* < instead of <=, because (ip+1) */ + const size_t hSmall = ZSTD_hashPtr(ip, hBitsS, mls); + const U32 matchIndex = hashSmall[hSmall]; + const BYTE* const matchBase = matchIndex < prefixStartIndex ? dictBase : base; + const BYTE* match = matchBase + matchIndex; + + const size_t hLong = ZSTD_hashPtr(ip, hBitsL, 8); + const U32 matchLongIndex = hashLong[hLong]; + const BYTE* const matchLongBase = matchLongIndex < prefixStartIndex ? dictBase : base; + const BYTE* matchLong = matchLongBase + matchLongIndex; + + const U32 curr = (U32)(ip-base); + const U32 repIndex = curr + 1 - offset_1; /* offset_1 expected <= curr +1 */ + const BYTE* const repBase = repIndex < prefixStartIndex ? dictBase : base; + const BYTE* const repMatch = repBase + repIndex; + size_t mLength; + hashSmall[hSmall] = hashLong[hLong] = curr; /* update hash table */ + + if ((((U32)((prefixStartIndex-1) - repIndex) >= 3) /* intentional underflow : ensure repIndex doesn't overlap dict + prefix */ + & (offset_1 < curr+1 - dictStartIndex)) /* note: we are searching at curr+1 */ + && (MEM_read32(repMatch) == MEM_read32(ip+1)) ) { + const BYTE* repMatchEnd = repIndex < prefixStartIndex ? dictEnd : iend; + mLength = ZSTD_count_2segments(ip+1+4, repMatch+4, iend, repMatchEnd, prefixStart) + 4; + ip++; + ZSTD_storeSeq(seqStore, (size_t)(ip-anchor), anchor, iend, 0, mLength-MINMATCH); + } else { + if ((matchLongIndex > dictStartIndex) && (MEM_read64(matchLong) == MEM_read64(ip))) { + const BYTE* const matchEnd = matchLongIndex < prefixStartIndex ? dictEnd : iend; + const BYTE* const lowMatchPtr = matchLongIndex < prefixStartIndex ? dictStart : prefixStart; + U32 offset; + mLength = ZSTD_count_2segments(ip+8, matchLong+8, iend, matchEnd, prefixStart) + 8; + offset = curr - matchLongIndex; + while (((ip>anchor) & (matchLong>lowMatchPtr)) && (ip[-1] == matchLong[-1])) { ip--; matchLong--; mLength++; } /* catch up */ + offset_2 = offset_1; + offset_1 = offset; + ZSTD_storeSeq(seqStore, (size_t)(ip-anchor), anchor, iend, offset + ZSTD_REP_MOVE, mLength-MINMATCH); + + } else if ((matchIndex > dictStartIndex) && (MEM_read32(match) == MEM_read32(ip))) { + size_t const h3 = ZSTD_hashPtr(ip+1, hBitsL, 8); + U32 const matchIndex3 = hashLong[h3]; + const BYTE* const match3Base = matchIndex3 < prefixStartIndex ? dictBase : base; + const BYTE* match3 = match3Base + matchIndex3; + U32 offset; + hashLong[h3] = curr + 1; + if ( (matchIndex3 > dictStartIndex) && (MEM_read64(match3) == MEM_read64(ip+1)) ) { + const BYTE* const matchEnd = matchIndex3 < prefixStartIndex ? dictEnd : iend; + const BYTE* const lowMatchPtr = matchIndex3 < prefixStartIndex ? dictStart : prefixStart; + mLength = ZSTD_count_2segments(ip+9, match3+8, iend, matchEnd, prefixStart) + 8; + ip++; + offset = curr+1 - matchIndex3; + while (((ip>anchor) & (match3>lowMatchPtr)) && (ip[-1] == match3[-1])) { ip--; match3--; mLength++; } /* catch up */ + } else { + const BYTE* const matchEnd = matchIndex < prefixStartIndex ? dictEnd : iend; + const BYTE* const lowMatchPtr = matchIndex < prefixStartIndex ? dictStart : prefixStart; + mLength = ZSTD_count_2segments(ip+4, match+4, iend, matchEnd, prefixStart) + 4; + offset = curr - matchIndex; + while (((ip>anchor) & (match>lowMatchPtr)) && (ip[-1] == match[-1])) { ip--; match--; mLength++; } /* catch up */ + } + offset_2 = offset_1; + offset_1 = offset; + ZSTD_storeSeq(seqStore, (size_t)(ip-anchor), anchor, iend, offset + ZSTD_REP_MOVE, mLength-MINMATCH); + + } else { + ip += ((ip-anchor) >> kSearchStrength) + 1; + continue; + } } + + /* move to next sequence start */ + ip += mLength; + anchor = ip; + + if (ip <= ilimit) { + /* Complementary insertion */ + /* done after iLimit test, as candidates could be > iend-8 */ + { U32 const indexToInsert = curr+2; + hashLong[ZSTD_hashPtr(base+indexToInsert, hBitsL, 8)] = indexToInsert; + hashLong[ZSTD_hashPtr(ip-2, hBitsL, 8)] = (U32)(ip-2-base); + hashSmall[ZSTD_hashPtr(base+indexToInsert, hBitsS, mls)] = indexToInsert; + hashSmall[ZSTD_hashPtr(ip-1, hBitsS, mls)] = (U32)(ip-1-base); + } + + /* check immediate repcode */ + while (ip <= ilimit) { + U32 const current2 = (U32)(ip-base); + U32 const repIndex2 = current2 - offset_2; + const BYTE* repMatch2 = repIndex2 < prefixStartIndex ? dictBase + repIndex2 : base + repIndex2; + if ( (((U32)((prefixStartIndex-1) - repIndex2) >= 3) /* intentional overflow : ensure repIndex2 doesn't overlap dict + prefix */ + & (offset_2 < current2 - dictStartIndex)) + && (MEM_read32(repMatch2) == MEM_read32(ip)) ) { + const BYTE* const repEnd2 = repIndex2 < prefixStartIndex ? dictEnd : iend; + size_t const repLength2 = ZSTD_count_2segments(ip+4, repMatch2+4, iend, repEnd2, prefixStart) + 4; + U32 const tmpOffset = offset_2; offset_2 = offset_1; offset_1 = tmpOffset; /* swap offset_2 <=> offset_1 */ + ZSTD_storeSeq(seqStore, 0, anchor, iend, 0, repLength2-MINMATCH); + hashSmall[ZSTD_hashPtr(ip, hBitsS, mls)] = current2; + hashLong[ZSTD_hashPtr(ip, hBitsL, 8)] = current2; + ip += repLength2; + anchor = ip; + continue; + } + break; + } } } + + /* save reps for next block */ + rep[0] = offset_1; + rep[1] = offset_2; + + /* Return the last literals size */ + return (size_t)(iend - anchor); +} + + +size_t ZSTD_compressBlock_doubleFast_extDict( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize) +{ + U32 const mls = ms->cParams.minMatch; + switch(mls) + { + default: /* includes case 3 */ + case 4 : + return ZSTD_compressBlock_doubleFast_extDict_generic(ms, seqStore, rep, src, srcSize, 4); + case 5 : + return ZSTD_compressBlock_doubleFast_extDict_generic(ms, seqStore, rep, src, srcSize, 5); + case 6 : + return ZSTD_compressBlock_doubleFast_extDict_generic(ms, seqStore, rep, src, srcSize, 6); + case 7 : + return ZSTD_compressBlock_doubleFast_extDict_generic(ms, seqStore, rep, src, srcSize, 7); + } +} diff --git a/external/zstd/lib/compress/zstd_double_fast.h b/external/zstd/lib/compress/zstd_double_fast.h new file mode 100644 index 00000000..e16b7b03 --- /dev/null +++ b/external/zstd/lib/compress/zstd_double_fast.h @@ -0,0 +1,38 @@ +/* + * Copyright (c) Yann Collet, Facebook, Inc. + * All rights reserved. + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. + */ + +#ifndef ZSTD_DOUBLE_FAST_H +#define ZSTD_DOUBLE_FAST_H + +#if defined (__cplusplus) +extern "C" { +#endif + +#include "../common/mem.h" /* U32 */ +#include "zstd_compress_internal.h" /* ZSTD_CCtx, size_t */ + +void ZSTD_fillDoubleHashTable(ZSTD_matchState_t* ms, + void const* end, ZSTD_dictTableLoadMethod_e dtlm); +size_t ZSTD_compressBlock_doubleFast( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize); +size_t ZSTD_compressBlock_doubleFast_dictMatchState( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize); +size_t ZSTD_compressBlock_doubleFast_extDict( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize); + + +#if defined (__cplusplus) +} +#endif + +#endif /* ZSTD_DOUBLE_FAST_H */ diff --git a/external/zstd/lib/compress/zstd_fast.c b/external/zstd/lib/compress/zstd_fast.c new file mode 100644 index 00000000..4edc04dc --- /dev/null +++ b/external/zstd/lib/compress/zstd_fast.c @@ -0,0 +1,496 @@ +/* + * Copyright (c) Yann Collet, Facebook, Inc. + * All rights reserved. + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. + */ + +#include "zstd_compress_internal.h" /* ZSTD_hashPtr, ZSTD_count, ZSTD_storeSeq */ +#include "zstd_fast.h" + + +void ZSTD_fillHashTable(ZSTD_matchState_t* ms, + const void* const end, + ZSTD_dictTableLoadMethod_e dtlm) +{ + const ZSTD_compressionParameters* const cParams = &ms->cParams; + U32* const hashTable = ms->hashTable; + U32 const hBits = cParams->hashLog; + U32 const mls = cParams->minMatch; + const BYTE* const base = ms->window.base; + const BYTE* ip = base + ms->nextToUpdate; + const BYTE* const iend = ((const BYTE*)end) - HASH_READ_SIZE; + const U32 fastHashFillStep = 3; + + /* Always insert every fastHashFillStep position into the hash table. + * Insert the other positions if their hash entry is empty. + */ + for ( ; ip + fastHashFillStep < iend + 2; ip += fastHashFillStep) { + U32 const curr = (U32)(ip - base); + size_t const hash0 = ZSTD_hashPtr(ip, hBits, mls); + hashTable[hash0] = curr; + if (dtlm == ZSTD_dtlm_fast) continue; + /* Only load extra positions for ZSTD_dtlm_full */ + { U32 p; + for (p = 1; p < fastHashFillStep; ++p) { + size_t const hash = ZSTD_hashPtr(ip + p, hBits, mls); + if (hashTable[hash] == 0) { /* not yet filled */ + hashTable[hash] = curr + p; + } } } } +} + + +FORCE_INLINE_TEMPLATE size_t +ZSTD_compressBlock_fast_generic( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize, + U32 const mls) +{ + const ZSTD_compressionParameters* const cParams = &ms->cParams; + U32* const hashTable = ms->hashTable; + U32 const hlog = cParams->hashLog; + /* support stepSize of 0 */ + size_t const stepSize = cParams->targetLength + !(cParams->targetLength) + 1; + const BYTE* const base = ms->window.base; + const BYTE* const istart = (const BYTE*)src; + /* We check ip0 (ip + 0) and ip1 (ip + 1) each loop */ + const BYTE* ip0 = istart; + const BYTE* ip1; + const BYTE* anchor = istart; + const U32 endIndex = (U32)((size_t)(istart - base) + srcSize); + const U32 prefixStartIndex = ZSTD_getLowestPrefixIndex(ms, endIndex, cParams->windowLog); + const BYTE* const prefixStart = base + prefixStartIndex; + const BYTE* const iend = istart + srcSize; + const BYTE* const ilimit = iend - HASH_READ_SIZE; + U32 offset_1=rep[0], offset_2=rep[1]; + U32 offsetSaved = 0; + + /* init */ + DEBUGLOG(5, "ZSTD_compressBlock_fast_generic"); + ip0 += (ip0 == prefixStart); + ip1 = ip0 + 1; + { U32 const curr = (U32)(ip0 - base); + U32 const windowLow = ZSTD_getLowestPrefixIndex(ms, curr, cParams->windowLog); + U32 const maxRep = curr - windowLow; + if (offset_2 > maxRep) offsetSaved = offset_2, offset_2 = 0; + if (offset_1 > maxRep) offsetSaved = offset_1, offset_1 = 0; + } + + /* Main Search Loop */ +#ifdef __INTEL_COMPILER + /* From intel 'The vector pragma indicates that the loop should be + * vectorized if it is legal to do so'. Can be used together with + * #pragma ivdep (but have opted to exclude that because intel + * warns against using it).*/ + #pragma vector always +#endif + while (ip1 < ilimit) { /* < instead of <=, because check at ip0+2 */ + size_t mLength; + BYTE const* ip2 = ip0 + 2; + size_t const h0 = ZSTD_hashPtr(ip0, hlog, mls); + U32 const val0 = MEM_read32(ip0); + size_t const h1 = ZSTD_hashPtr(ip1, hlog, mls); + U32 const val1 = MEM_read32(ip1); + U32 const current0 = (U32)(ip0-base); + U32 const current1 = (U32)(ip1-base); + U32 const matchIndex0 = hashTable[h0]; + U32 const matchIndex1 = hashTable[h1]; + BYTE const* repMatch = ip2 - offset_1; + const BYTE* match0 = base + matchIndex0; + const BYTE* match1 = base + matchIndex1; + U32 offcode; + +#if defined(__aarch64__) + PREFETCH_L1(ip0+256); +#endif + + hashTable[h0] = current0; /* update hash table */ + hashTable[h1] = current1; /* update hash table */ + + assert(ip0 + 1 == ip1); + + if ((offset_1 > 0) & (MEM_read32(repMatch) == MEM_read32(ip2))) { + mLength = (ip2[-1] == repMatch[-1]) ? 1 : 0; + ip0 = ip2 - mLength; + match0 = repMatch - mLength; + mLength += 4; + offcode = 0; + goto _match; + } + if ((matchIndex0 > prefixStartIndex) && MEM_read32(match0) == val0) { + /* found a regular match */ + goto _offset; + } + if ((matchIndex1 > prefixStartIndex) && MEM_read32(match1) == val1) { + /* found a regular match after one literal */ + ip0 = ip1; + match0 = match1; + goto _offset; + } + { size_t const step = ((size_t)(ip0-anchor) >> (kSearchStrength - 1)) + stepSize; + assert(step >= 2); + ip0 += step; + ip1 += step; + continue; + } +_offset: /* Requires: ip0, match0 */ + /* Compute the offset code */ + offset_2 = offset_1; + offset_1 = (U32)(ip0-match0); + offcode = offset_1 + ZSTD_REP_MOVE; + mLength = 4; + /* Count the backwards match length */ + while (((ip0>anchor) & (match0>prefixStart)) + && (ip0[-1] == match0[-1])) { ip0--; match0--; mLength++; } /* catch up */ + +_match: /* Requires: ip0, match0, offcode */ + /* Count the forward length */ + mLength += ZSTD_count(ip0+mLength, match0+mLength, iend); + ZSTD_storeSeq(seqStore, (size_t)(ip0-anchor), anchor, iend, offcode, mLength-MINMATCH); + /* match found */ + ip0 += mLength; + anchor = ip0; + + if (ip0 <= ilimit) { + /* Fill Table */ + assert(base+current0+2 > istart); /* check base overflow */ + hashTable[ZSTD_hashPtr(base+current0+2, hlog, mls)] = current0+2; /* here because current+2 could be > iend-8 */ + hashTable[ZSTD_hashPtr(ip0-2, hlog, mls)] = (U32)(ip0-2-base); + + if (offset_2 > 0) { /* offset_2==0 means offset_2 is invalidated */ + while ( (ip0 <= ilimit) && (MEM_read32(ip0) == MEM_read32(ip0 - offset_2)) ) { + /* store sequence */ + size_t const rLength = ZSTD_count(ip0+4, ip0+4-offset_2, iend) + 4; + { U32 const tmpOff = offset_2; offset_2 = offset_1; offset_1 = tmpOff; } /* swap offset_2 <=> offset_1 */ + hashTable[ZSTD_hashPtr(ip0, hlog, mls)] = (U32)(ip0-base); + ip0 += rLength; + ZSTD_storeSeq(seqStore, 0 /*litLen*/, anchor, iend, 0 /*offCode*/, rLength-MINMATCH); + anchor = ip0; + continue; /* faster when present (confirmed on gcc-8) ... (?) */ + } } } + ip1 = ip0 + 1; + } + + /* save reps for next block */ + rep[0] = offset_1 ? offset_1 : offsetSaved; + rep[1] = offset_2 ? offset_2 : offsetSaved; + + /* Return the last literals size */ + return (size_t)(iend - anchor); +} + + +size_t ZSTD_compressBlock_fast( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize) +{ + U32 const mls = ms->cParams.minMatch; + assert(ms->dictMatchState == NULL); + switch(mls) + { + default: /* includes case 3 */ + case 4 : + return ZSTD_compressBlock_fast_generic(ms, seqStore, rep, src, srcSize, 4); + case 5 : + return ZSTD_compressBlock_fast_generic(ms, seqStore, rep, src, srcSize, 5); + case 6 : + return ZSTD_compressBlock_fast_generic(ms, seqStore, rep, src, srcSize, 6); + case 7 : + return ZSTD_compressBlock_fast_generic(ms, seqStore, rep, src, srcSize, 7); + } +} + +FORCE_INLINE_TEMPLATE +size_t ZSTD_compressBlock_fast_dictMatchState_generic( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize, U32 const mls) +{ + const ZSTD_compressionParameters* const cParams = &ms->cParams; + U32* const hashTable = ms->hashTable; + U32 const hlog = cParams->hashLog; + /* support stepSize of 0 */ + U32 const stepSize = cParams->targetLength + !(cParams->targetLength); + const BYTE* const base = ms->window.base; + const BYTE* const istart = (const BYTE*)src; + const BYTE* ip = istart; + const BYTE* anchor = istart; + const U32 prefixStartIndex = ms->window.dictLimit; + const BYTE* const prefixStart = base + prefixStartIndex; + const BYTE* const iend = istart + srcSize; + const BYTE* const ilimit = iend - HASH_READ_SIZE; + U32 offset_1=rep[0], offset_2=rep[1]; + U32 offsetSaved = 0; + + const ZSTD_matchState_t* const dms = ms->dictMatchState; + const ZSTD_compressionParameters* const dictCParams = &dms->cParams ; + const U32* const dictHashTable = dms->hashTable; + const U32 dictStartIndex = dms->window.dictLimit; + const BYTE* const dictBase = dms->window.base; + const BYTE* const dictStart = dictBase + dictStartIndex; + const BYTE* const dictEnd = dms->window.nextSrc; + const U32 dictIndexDelta = prefixStartIndex - (U32)(dictEnd - dictBase); + const U32 dictAndPrefixLength = (U32)(ip - prefixStart + dictEnd - dictStart); + const U32 dictHLog = dictCParams->hashLog; + + /* if a dictionary is still attached, it necessarily means that + * it is within window size. So we just check it. */ + const U32 maxDistance = 1U << cParams->windowLog; + const U32 endIndex = (U32)((size_t)(ip - base) + srcSize); + assert(endIndex - prefixStartIndex <= maxDistance); + (void)maxDistance; (void)endIndex; /* these variables are not used when assert() is disabled */ + + /* ensure there will be no underflow + * when translating a dict index into a local index */ + assert(prefixStartIndex >= (U32)(dictEnd - dictBase)); + + /* init */ + DEBUGLOG(5, "ZSTD_compressBlock_fast_dictMatchState_generic"); + ip += (dictAndPrefixLength == 0); + /* dictMatchState repCode checks don't currently handle repCode == 0 + * disabling. */ + assert(offset_1 <= dictAndPrefixLength); + assert(offset_2 <= dictAndPrefixLength); + + /* Main Search Loop */ + while (ip < ilimit) { /* < instead of <=, because repcode check at (ip+1) */ + size_t mLength; + size_t const h = ZSTD_hashPtr(ip, hlog, mls); + U32 const curr = (U32)(ip-base); + U32 const matchIndex = hashTable[h]; + const BYTE* match = base + matchIndex; + const U32 repIndex = curr + 1 - offset_1; + const BYTE* repMatch = (repIndex < prefixStartIndex) ? + dictBase + (repIndex - dictIndexDelta) : + base + repIndex; + hashTable[h] = curr; /* update hash table */ + + if ( ((U32)((prefixStartIndex-1) - repIndex) >= 3) /* intentional underflow : ensure repIndex isn't overlapping dict + prefix */ + && (MEM_read32(repMatch) == MEM_read32(ip+1)) ) { + const BYTE* const repMatchEnd = repIndex < prefixStartIndex ? dictEnd : iend; + mLength = ZSTD_count_2segments(ip+1+4, repMatch+4, iend, repMatchEnd, prefixStart) + 4; + ip++; + ZSTD_storeSeq(seqStore, (size_t)(ip-anchor), anchor, iend, 0, mLength-MINMATCH); + } else if ( (matchIndex <= prefixStartIndex) ) { + size_t const dictHash = ZSTD_hashPtr(ip, dictHLog, mls); + U32 const dictMatchIndex = dictHashTable[dictHash]; + const BYTE* dictMatch = dictBase + dictMatchIndex; + if (dictMatchIndex <= dictStartIndex || + MEM_read32(dictMatch) != MEM_read32(ip)) { + assert(stepSize >= 1); + ip += ((ip-anchor) >> kSearchStrength) + stepSize; + continue; + } else { + /* found a dict match */ + U32 const offset = (U32)(curr-dictMatchIndex-dictIndexDelta); + mLength = ZSTD_count_2segments(ip+4, dictMatch+4, iend, dictEnd, prefixStart) + 4; + while (((ip>anchor) & (dictMatch>dictStart)) + && (ip[-1] == dictMatch[-1])) { + ip--; dictMatch--; mLength++; + } /* catch up */ + offset_2 = offset_1; + offset_1 = offset; + ZSTD_storeSeq(seqStore, (size_t)(ip-anchor), anchor, iend, offset + ZSTD_REP_MOVE, mLength-MINMATCH); + } + } else if (MEM_read32(match) != MEM_read32(ip)) { + /* it's not a match, and we're not going to check the dictionary */ + assert(stepSize >= 1); + ip += ((ip-anchor) >> kSearchStrength) + stepSize; + continue; + } else { + /* found a regular match */ + U32 const offset = (U32)(ip-match); + mLength = ZSTD_count(ip+4, match+4, iend) + 4; + while (((ip>anchor) & (match>prefixStart)) + && (ip[-1] == match[-1])) { ip--; match--; mLength++; } /* catch up */ + offset_2 = offset_1; + offset_1 = offset; + ZSTD_storeSeq(seqStore, (size_t)(ip-anchor), anchor, iend, offset + ZSTD_REP_MOVE, mLength-MINMATCH); + } + + /* match found */ + ip += mLength; + anchor = ip; + + if (ip <= ilimit) { + /* Fill Table */ + assert(base+curr+2 > istart); /* check base overflow */ + hashTable[ZSTD_hashPtr(base+curr+2, hlog, mls)] = curr+2; /* here because curr+2 could be > iend-8 */ + hashTable[ZSTD_hashPtr(ip-2, hlog, mls)] = (U32)(ip-2-base); + + /* check immediate repcode */ + while (ip <= ilimit) { + U32 const current2 = (U32)(ip-base); + U32 const repIndex2 = current2 - offset_2; + const BYTE* repMatch2 = repIndex2 < prefixStartIndex ? + dictBase - dictIndexDelta + repIndex2 : + base + repIndex2; + if ( ((U32)((prefixStartIndex-1) - (U32)repIndex2) >= 3 /* intentional overflow */) + && (MEM_read32(repMatch2) == MEM_read32(ip)) ) { + const BYTE* const repEnd2 = repIndex2 < prefixStartIndex ? dictEnd : iend; + size_t const repLength2 = ZSTD_count_2segments(ip+4, repMatch2+4, iend, repEnd2, prefixStart) + 4; + U32 tmpOffset = offset_2; offset_2 = offset_1; offset_1 = tmpOffset; /* swap offset_2 <=> offset_1 */ + ZSTD_storeSeq(seqStore, 0, anchor, iend, 0, repLength2-MINMATCH); + hashTable[ZSTD_hashPtr(ip, hlog, mls)] = current2; + ip += repLength2; + anchor = ip; + continue; + } + break; + } + } + } + + /* save reps for next block */ + rep[0] = offset_1 ? offset_1 : offsetSaved; + rep[1] = offset_2 ? offset_2 : offsetSaved; + + /* Return the last literals size */ + return (size_t)(iend - anchor); +} + +size_t ZSTD_compressBlock_fast_dictMatchState( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize) +{ + U32 const mls = ms->cParams.minMatch; + assert(ms->dictMatchState != NULL); + switch(mls) + { + default: /* includes case 3 */ + case 4 : + return ZSTD_compressBlock_fast_dictMatchState_generic(ms, seqStore, rep, src, srcSize, 4); + case 5 : + return ZSTD_compressBlock_fast_dictMatchState_generic(ms, seqStore, rep, src, srcSize, 5); + case 6 : + return ZSTD_compressBlock_fast_dictMatchState_generic(ms, seqStore, rep, src, srcSize, 6); + case 7 : + return ZSTD_compressBlock_fast_dictMatchState_generic(ms, seqStore, rep, src, srcSize, 7); + } +} + + +static size_t ZSTD_compressBlock_fast_extDict_generic( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize, U32 const mls) +{ + const ZSTD_compressionParameters* const cParams = &ms->cParams; + U32* const hashTable = ms->hashTable; + U32 const hlog = cParams->hashLog; + /* support stepSize of 0 */ + U32 const stepSize = cParams->targetLength + !(cParams->targetLength); + const BYTE* const base = ms->window.base; + const BYTE* const dictBase = ms->window.dictBase; + const BYTE* const istart = (const BYTE*)src; + const BYTE* ip = istart; + const BYTE* anchor = istart; + const U32 endIndex = (U32)((size_t)(istart - base) + srcSize); + const U32 lowLimit = ZSTD_getLowestMatchIndex(ms, endIndex, cParams->windowLog); + const U32 dictStartIndex = lowLimit; + const BYTE* const dictStart = dictBase + dictStartIndex; + const U32 dictLimit = ms->window.dictLimit; + const U32 prefixStartIndex = dictLimit < lowLimit ? lowLimit : dictLimit; + const BYTE* const prefixStart = base + prefixStartIndex; + const BYTE* const dictEnd = dictBase + prefixStartIndex; + const BYTE* const iend = istart + srcSize; + const BYTE* const ilimit = iend - 8; + U32 offset_1=rep[0], offset_2=rep[1]; + + DEBUGLOG(5, "ZSTD_compressBlock_fast_extDict_generic (offset_1=%u)", offset_1); + + /* switch to "regular" variant if extDict is invalidated due to maxDistance */ + if (prefixStartIndex == dictStartIndex) + return ZSTD_compressBlock_fast_generic(ms, seqStore, rep, src, srcSize, mls); + + /* Search Loop */ + while (ip < ilimit) { /* < instead of <=, because (ip+1) */ + const size_t h = ZSTD_hashPtr(ip, hlog, mls); + const U32 matchIndex = hashTable[h]; + const BYTE* const matchBase = matchIndex < prefixStartIndex ? dictBase : base; + const BYTE* match = matchBase + matchIndex; + const U32 curr = (U32)(ip-base); + const U32 repIndex = curr + 1 - offset_1; + const BYTE* const repBase = repIndex < prefixStartIndex ? dictBase : base; + const BYTE* const repMatch = repBase + repIndex; + hashTable[h] = curr; /* update hash table */ + DEBUGLOG(7, "offset_1 = %u , curr = %u", offset_1, curr); + + if ( ( ((U32)((prefixStartIndex-1) - repIndex) >= 3) /* intentional underflow */ + & (offset_1 < curr+1 - dictStartIndex) ) /* note: we are searching at curr+1 */ + && (MEM_read32(repMatch) == MEM_read32(ip+1)) ) { + const BYTE* const repMatchEnd = repIndex < prefixStartIndex ? dictEnd : iend; + size_t const rLength = ZSTD_count_2segments(ip+1 +4, repMatch +4, iend, repMatchEnd, prefixStart) + 4; + ip++; + ZSTD_storeSeq(seqStore, (size_t)(ip-anchor), anchor, iend, 0, rLength-MINMATCH); + ip += rLength; + anchor = ip; + } else { + if ( (matchIndex < dictStartIndex) || + (MEM_read32(match) != MEM_read32(ip)) ) { + assert(stepSize >= 1); + ip += ((ip-anchor) >> kSearchStrength) + stepSize; + continue; + } + { const BYTE* const matchEnd = matchIndex < prefixStartIndex ? dictEnd : iend; + const BYTE* const lowMatchPtr = matchIndex < prefixStartIndex ? dictStart : prefixStart; + U32 const offset = curr - matchIndex; + size_t mLength = ZSTD_count_2segments(ip+4, match+4, iend, matchEnd, prefixStart) + 4; + while (((ip>anchor) & (match>lowMatchPtr)) && (ip[-1] == match[-1])) { ip--; match--; mLength++; } /* catch up */ + offset_2 = offset_1; offset_1 = offset; /* update offset history */ + ZSTD_storeSeq(seqStore, (size_t)(ip-anchor), anchor, iend, offset + ZSTD_REP_MOVE, mLength-MINMATCH); + ip += mLength; + anchor = ip; + } } + + if (ip <= ilimit) { + /* Fill Table */ + hashTable[ZSTD_hashPtr(base+curr+2, hlog, mls)] = curr+2; + hashTable[ZSTD_hashPtr(ip-2, hlog, mls)] = (U32)(ip-2-base); + /* check immediate repcode */ + while (ip <= ilimit) { + U32 const current2 = (U32)(ip-base); + U32 const repIndex2 = current2 - offset_2; + const BYTE* const repMatch2 = repIndex2 < prefixStartIndex ? dictBase + repIndex2 : base + repIndex2; + if ( (((U32)((prefixStartIndex-1) - repIndex2) >= 3) & (offset_2 < curr - dictStartIndex)) /* intentional overflow */ + && (MEM_read32(repMatch2) == MEM_read32(ip)) ) { + const BYTE* const repEnd2 = repIndex2 < prefixStartIndex ? dictEnd : iend; + size_t const repLength2 = ZSTD_count_2segments(ip+4, repMatch2+4, iend, repEnd2, prefixStart) + 4; + { U32 const tmpOffset = offset_2; offset_2 = offset_1; offset_1 = tmpOffset; } /* swap offset_2 <=> offset_1 */ + ZSTD_storeSeq(seqStore, 0 /*litlen*/, anchor, iend, 0 /*offcode*/, repLength2-MINMATCH); + hashTable[ZSTD_hashPtr(ip, hlog, mls)] = current2; + ip += repLength2; + anchor = ip; + continue; + } + break; + } } } + + /* save reps for next block */ + rep[0] = offset_1; + rep[1] = offset_2; + + /* Return the last literals size */ + return (size_t)(iend - anchor); +} + + +size_t ZSTD_compressBlock_fast_extDict( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize) +{ + U32 const mls = ms->cParams.minMatch; + switch(mls) + { + default: /* includes case 3 */ + case 4 : + return ZSTD_compressBlock_fast_extDict_generic(ms, seqStore, rep, src, srcSize, 4); + case 5 : + return ZSTD_compressBlock_fast_extDict_generic(ms, seqStore, rep, src, srcSize, 5); + case 6 : + return ZSTD_compressBlock_fast_extDict_generic(ms, seqStore, rep, src, srcSize, 6); + case 7 : + return ZSTD_compressBlock_fast_extDict_generic(ms, seqStore, rep, src, srcSize, 7); + } +} diff --git a/external/zstd/lib/compress/zstd_fast.h b/external/zstd/lib/compress/zstd_fast.h new file mode 100644 index 00000000..0d4a0c10 --- /dev/null +++ b/external/zstd/lib/compress/zstd_fast.h @@ -0,0 +1,37 @@ +/* + * Copyright (c) Yann Collet, Facebook, Inc. + * All rights reserved. + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. + */ + +#ifndef ZSTD_FAST_H +#define ZSTD_FAST_H + +#if defined (__cplusplus) +extern "C" { +#endif + +#include "../common/mem.h" /* U32 */ +#include "zstd_compress_internal.h" + +void ZSTD_fillHashTable(ZSTD_matchState_t* ms, + void const* end, ZSTD_dictTableLoadMethod_e dtlm); +size_t ZSTD_compressBlock_fast( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize); +size_t ZSTD_compressBlock_fast_dictMatchState( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize); +size_t ZSTD_compressBlock_fast_extDict( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize); + +#if defined (__cplusplus) +} +#endif + +#endif /* ZSTD_FAST_H */ diff --git a/external/zstd/lib/compress/zstd_lazy.c b/external/zstd/lib/compress/zstd_lazy.c new file mode 100644 index 00000000..3d523e84 --- /dev/null +++ b/external/zstd/lib/compress/zstd_lazy.c @@ -0,0 +1,2184 @@ +/* + * Copyright (c) Yann Collet, Facebook, Inc. + * All rights reserved. + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. + */ + +#include "zstd_compress_internal.h" +#include "zstd_lazy.h" + + +/*-************************************* +* Binary Tree search +***************************************/ + +static void +ZSTD_updateDUBT(ZSTD_matchState_t* ms, + const BYTE* ip, const BYTE* iend, + U32 mls) +{ + const ZSTD_compressionParameters* const cParams = &ms->cParams; + U32* const hashTable = ms->hashTable; + U32 const hashLog = cParams->hashLog; + + U32* const bt = ms->chainTable; + U32 const btLog = cParams->chainLog - 1; + U32 const btMask = (1 << btLog) - 1; + + const BYTE* const base = ms->window.base; + U32 const target = (U32)(ip - base); + U32 idx = ms->nextToUpdate; + + if (idx != target) + DEBUGLOG(7, "ZSTD_updateDUBT, from %u to %u (dictLimit:%u)", + idx, target, ms->window.dictLimit); + assert(ip + 8 <= iend); /* condition for ZSTD_hashPtr */ + (void)iend; + + assert(idx >= ms->window.dictLimit); /* condition for valid base+idx */ + for ( ; idx < target ; idx++) { + size_t const h = ZSTD_hashPtr(base + idx, hashLog, mls); /* assumption : ip + 8 <= iend */ + U32 const matchIndex = hashTable[h]; + + U32* const nextCandidatePtr = bt + 2*(idx&btMask); + U32* const sortMarkPtr = nextCandidatePtr + 1; + + DEBUGLOG(8, "ZSTD_updateDUBT: insert %u", idx); + hashTable[h] = idx; /* Update Hash Table */ + *nextCandidatePtr = matchIndex; /* update BT like a chain */ + *sortMarkPtr = ZSTD_DUBT_UNSORTED_MARK; + } + ms->nextToUpdate = target; +} + + +/** ZSTD_insertDUBT1() : + * sort one already inserted but unsorted position + * assumption : curr >= btlow == (curr - btmask) + * doesn't fail */ +static void +ZSTD_insertDUBT1(ZSTD_matchState_t* ms, + U32 curr, const BYTE* inputEnd, + U32 nbCompares, U32 btLow, + const ZSTD_dictMode_e dictMode) +{ + const ZSTD_compressionParameters* const cParams = &ms->cParams; + U32* const bt = ms->chainTable; + U32 const btLog = cParams->chainLog - 1; + U32 const btMask = (1 << btLog) - 1; + size_t commonLengthSmaller=0, commonLengthLarger=0; + const BYTE* const base = ms->window.base; + const BYTE* const dictBase = ms->window.dictBase; + const U32 dictLimit = ms->window.dictLimit; + const BYTE* const ip = (curr>=dictLimit) ? base + curr : dictBase + curr; + const BYTE* const iend = (curr>=dictLimit) ? inputEnd : dictBase + dictLimit; + const BYTE* const dictEnd = dictBase + dictLimit; + const BYTE* const prefixStart = base + dictLimit; + const BYTE* match; + U32* smallerPtr = bt + 2*(curr&btMask); + U32* largerPtr = smallerPtr + 1; + U32 matchIndex = *smallerPtr; /* this candidate is unsorted : next sorted candidate is reached through *smallerPtr, while *largerPtr contains previous unsorted candidate (which is already saved and can be overwritten) */ + U32 dummy32; /* to be nullified at the end */ + U32 const windowValid = ms->window.lowLimit; + U32 const maxDistance = 1U << cParams->windowLog; + U32 const windowLow = (curr - windowValid > maxDistance) ? curr - maxDistance : windowValid; + + + DEBUGLOG(8, "ZSTD_insertDUBT1(%u) (dictLimit=%u, lowLimit=%u)", + curr, dictLimit, windowLow); + assert(curr >= btLow); + assert(ip < iend); /* condition for ZSTD_count */ + + while (nbCompares-- && (matchIndex > windowLow)) { + U32* const nextPtr = bt + 2*(matchIndex & btMask); + size_t matchLength = MIN(commonLengthSmaller, commonLengthLarger); /* guaranteed minimum nb of common bytes */ + assert(matchIndex < curr); + /* note : all candidates are now supposed sorted, + * but it's still possible to have nextPtr[1] == ZSTD_DUBT_UNSORTED_MARK + * when a real index has the same value as ZSTD_DUBT_UNSORTED_MARK */ + + if ( (dictMode != ZSTD_extDict) + || (matchIndex+matchLength >= dictLimit) /* both in current segment*/ + || (curr < dictLimit) /* both in extDict */) { + const BYTE* const mBase = ( (dictMode != ZSTD_extDict) + || (matchIndex+matchLength >= dictLimit)) ? + base : dictBase; + assert( (matchIndex+matchLength >= dictLimit) /* might be wrong if extDict is incorrectly set to 0 */ + || (curr < dictLimit) ); + match = mBase + matchIndex; + matchLength += ZSTD_count(ip+matchLength, match+matchLength, iend); + } else { + match = dictBase + matchIndex; + matchLength += ZSTD_count_2segments(ip+matchLength, match+matchLength, iend, dictEnd, prefixStart); + if (matchIndex+matchLength >= dictLimit) + match = base + matchIndex; /* preparation for next read of match[matchLength] */ + } + + DEBUGLOG(8, "ZSTD_insertDUBT1: comparing %u with %u : found %u common bytes ", + curr, matchIndex, (U32)matchLength); + + if (ip+matchLength == iend) { /* equal : no way to know if inf or sup */ + break; /* drop , to guarantee consistency ; miss a bit of compression, but other solutions can corrupt tree */ + } + + if (match[matchLength] < ip[matchLength]) { /* necessarily within buffer */ + /* match is smaller than current */ + *smallerPtr = matchIndex; /* update smaller idx */ + commonLengthSmaller = matchLength; /* all smaller will now have at least this guaranteed common length */ + if (matchIndex <= btLow) { smallerPtr=&dummy32; break; } /* beyond tree size, stop searching */ + DEBUGLOG(8, "ZSTD_insertDUBT1: %u (>btLow=%u) is smaller : next => %u", + matchIndex, btLow, nextPtr[1]); + smallerPtr = nextPtr+1; /* new "candidate" => larger than match, which was smaller than target */ + matchIndex = nextPtr[1]; /* new matchIndex, larger than previous and closer to current */ + } else { + /* match is larger than current */ + *largerPtr = matchIndex; + commonLengthLarger = matchLength; + if (matchIndex <= btLow) { largerPtr=&dummy32; break; } /* beyond tree size, stop searching */ + DEBUGLOG(8, "ZSTD_insertDUBT1: %u (>btLow=%u) is larger => %u", + matchIndex, btLow, nextPtr[0]); + largerPtr = nextPtr; + matchIndex = nextPtr[0]; + } } + + *smallerPtr = *largerPtr = 0; +} + + +static size_t +ZSTD_DUBT_findBetterDictMatch ( + ZSTD_matchState_t* ms, + const BYTE* const ip, const BYTE* const iend, + size_t* offsetPtr, + size_t bestLength, + U32 nbCompares, + U32 const mls, + const ZSTD_dictMode_e dictMode) +{ + const ZSTD_matchState_t * const dms = ms->dictMatchState; + const ZSTD_compressionParameters* const dmsCParams = &dms->cParams; + const U32 * const dictHashTable = dms->hashTable; + U32 const hashLog = dmsCParams->hashLog; + size_t const h = ZSTD_hashPtr(ip, hashLog, mls); + U32 dictMatchIndex = dictHashTable[h]; + + const BYTE* const base = ms->window.base; + const BYTE* const prefixStart = base + ms->window.dictLimit; + U32 const curr = (U32)(ip-base); + const BYTE* const dictBase = dms->window.base; + const BYTE* const dictEnd = dms->window.nextSrc; + U32 const dictHighLimit = (U32)(dms->window.nextSrc - dms->window.base); + U32 const dictLowLimit = dms->window.lowLimit; + U32 const dictIndexDelta = ms->window.lowLimit - dictHighLimit; + + U32* const dictBt = dms->chainTable; + U32 const btLog = dmsCParams->chainLog - 1; + U32 const btMask = (1 << btLog) - 1; + U32 const btLow = (btMask >= dictHighLimit - dictLowLimit) ? dictLowLimit : dictHighLimit - btMask; + + size_t commonLengthSmaller=0, commonLengthLarger=0; + + (void)dictMode; + assert(dictMode == ZSTD_dictMatchState); + + while (nbCompares-- && (dictMatchIndex > dictLowLimit)) { + U32* const nextPtr = dictBt + 2*(dictMatchIndex & btMask); + size_t matchLength = MIN(commonLengthSmaller, commonLengthLarger); /* guaranteed minimum nb of common bytes */ + const BYTE* match = dictBase + dictMatchIndex; + matchLength += ZSTD_count_2segments(ip+matchLength, match+matchLength, iend, dictEnd, prefixStart); + if (dictMatchIndex+matchLength >= dictHighLimit) + match = base + dictMatchIndex + dictIndexDelta; /* to prepare for next usage of match[matchLength] */ + + if (matchLength > bestLength) { + U32 matchIndex = dictMatchIndex + dictIndexDelta; + if ( (4*(int)(matchLength-bestLength)) > (int)(ZSTD_highbit32(curr-matchIndex+1) - ZSTD_highbit32((U32)offsetPtr[0]+1)) ) { + DEBUGLOG(9, "ZSTD_DUBT_findBetterDictMatch(%u) : found better match length %u -> %u and offsetCode %u -> %u (dictMatchIndex %u, matchIndex %u)", + curr, (U32)bestLength, (U32)matchLength, (U32)*offsetPtr, ZSTD_REP_MOVE + curr - matchIndex, dictMatchIndex, matchIndex); + bestLength = matchLength, *offsetPtr = ZSTD_REP_MOVE + curr - matchIndex; + } + if (ip+matchLength == iend) { /* reached end of input : ip[matchLength] is not valid, no way to know if it's larger or smaller than match */ + break; /* drop, to guarantee consistency (miss a little bit of compression) */ + } + } + + if (match[matchLength] < ip[matchLength]) { + if (dictMatchIndex <= btLow) { break; } /* beyond tree size, stop the search */ + commonLengthSmaller = matchLength; /* all smaller will now have at least this guaranteed common length */ + dictMatchIndex = nextPtr[1]; /* new matchIndex larger than previous (closer to current) */ + } else { + /* match is larger than current */ + if (dictMatchIndex <= btLow) { break; } /* beyond tree size, stop the search */ + commonLengthLarger = matchLength; + dictMatchIndex = nextPtr[0]; + } + } + + if (bestLength >= MINMATCH) { + U32 const mIndex = curr - ((U32)*offsetPtr - ZSTD_REP_MOVE); (void)mIndex; + DEBUGLOG(8, "ZSTD_DUBT_findBetterDictMatch(%u) : found match of length %u and offsetCode %u (pos %u)", + curr, (U32)bestLength, (U32)*offsetPtr, mIndex); + } + return bestLength; + +} + + +static size_t +ZSTD_DUBT_findBestMatch(ZSTD_matchState_t* ms, + const BYTE* const ip, const BYTE* const iend, + size_t* offsetPtr, + U32 const mls, + const ZSTD_dictMode_e dictMode) +{ + const ZSTD_compressionParameters* const cParams = &ms->cParams; + U32* const hashTable = ms->hashTable; + U32 const hashLog = cParams->hashLog; + size_t const h = ZSTD_hashPtr(ip, hashLog, mls); + U32 matchIndex = hashTable[h]; + + const BYTE* const base = ms->window.base; + U32 const curr = (U32)(ip-base); + U32 const windowLow = ZSTD_getLowestMatchIndex(ms, curr, cParams->windowLog); + + U32* const bt = ms->chainTable; + U32 const btLog = cParams->chainLog - 1; + U32 const btMask = (1 << btLog) - 1; + U32 const btLow = (btMask >= curr) ? 0 : curr - btMask; + U32 const unsortLimit = MAX(btLow, windowLow); + + U32* nextCandidate = bt + 2*(matchIndex&btMask); + U32* unsortedMark = bt + 2*(matchIndex&btMask) + 1; + U32 nbCompares = 1U << cParams->searchLog; + U32 nbCandidates = nbCompares; + U32 previousCandidate = 0; + + DEBUGLOG(7, "ZSTD_DUBT_findBestMatch (%u) ", curr); + assert(ip <= iend-8); /* required for h calculation */ + assert(dictMode != ZSTD_dedicatedDictSearch); + + /* reach end of unsorted candidates list */ + while ( (matchIndex > unsortLimit) + && (*unsortedMark == ZSTD_DUBT_UNSORTED_MARK) + && (nbCandidates > 1) ) { + DEBUGLOG(8, "ZSTD_DUBT_findBestMatch: candidate %u is unsorted", + matchIndex); + *unsortedMark = previousCandidate; /* the unsortedMark becomes a reversed chain, to move up back to original position */ + previousCandidate = matchIndex; + matchIndex = *nextCandidate; + nextCandidate = bt + 2*(matchIndex&btMask); + unsortedMark = bt + 2*(matchIndex&btMask) + 1; + nbCandidates --; + } + + /* nullify last candidate if it's still unsorted + * simplification, detrimental to compression ratio, beneficial for speed */ + if ( (matchIndex > unsortLimit) + && (*unsortedMark==ZSTD_DUBT_UNSORTED_MARK) ) { + DEBUGLOG(7, "ZSTD_DUBT_findBestMatch: nullify last unsorted candidate %u", + matchIndex); + *nextCandidate = *unsortedMark = 0; + } + + /* batch sort stacked candidates */ + matchIndex = previousCandidate; + while (matchIndex) { /* will end on matchIndex == 0 */ + U32* const nextCandidateIdxPtr = bt + 2*(matchIndex&btMask) + 1; + U32 const nextCandidateIdx = *nextCandidateIdxPtr; + ZSTD_insertDUBT1(ms, matchIndex, iend, + nbCandidates, unsortLimit, dictMode); + matchIndex = nextCandidateIdx; + nbCandidates++; + } + + /* find longest match */ + { size_t commonLengthSmaller = 0, commonLengthLarger = 0; + const BYTE* const dictBase = ms->window.dictBase; + const U32 dictLimit = ms->window.dictLimit; + const BYTE* const dictEnd = dictBase + dictLimit; + const BYTE* const prefixStart = base + dictLimit; + U32* smallerPtr = bt + 2*(curr&btMask); + U32* largerPtr = bt + 2*(curr&btMask) + 1; + U32 matchEndIdx = curr + 8 + 1; + U32 dummy32; /* to be nullified at the end */ + size_t bestLength = 0; + + matchIndex = hashTable[h]; + hashTable[h] = curr; /* Update Hash Table */ + + while (nbCompares-- && (matchIndex > windowLow)) { + U32* const nextPtr = bt + 2*(matchIndex & btMask); + size_t matchLength = MIN(commonLengthSmaller, commonLengthLarger); /* guaranteed minimum nb of common bytes */ + const BYTE* match; + + if ((dictMode != ZSTD_extDict) || (matchIndex+matchLength >= dictLimit)) { + match = base + matchIndex; + matchLength += ZSTD_count(ip+matchLength, match+matchLength, iend); + } else { + match = dictBase + matchIndex; + matchLength += ZSTD_count_2segments(ip+matchLength, match+matchLength, iend, dictEnd, prefixStart); + if (matchIndex+matchLength >= dictLimit) + match = base + matchIndex; /* to prepare for next usage of match[matchLength] */ + } + + if (matchLength > bestLength) { + if (matchLength > matchEndIdx - matchIndex) + matchEndIdx = matchIndex + (U32)matchLength; + if ( (4*(int)(matchLength-bestLength)) > (int)(ZSTD_highbit32(curr-matchIndex+1) - ZSTD_highbit32((U32)offsetPtr[0]+1)) ) + bestLength = matchLength, *offsetPtr = ZSTD_REP_MOVE + curr - matchIndex; + if (ip+matchLength == iend) { /* equal : no way to know if inf or sup */ + if (dictMode == ZSTD_dictMatchState) { + nbCompares = 0; /* in addition to avoiding checking any + * further in this loop, make sure we + * skip checking in the dictionary. */ + } + break; /* drop, to guarantee consistency (miss a little bit of compression) */ + } + } + + if (match[matchLength] < ip[matchLength]) { + /* match is smaller than current */ + *smallerPtr = matchIndex; /* update smaller idx */ + commonLengthSmaller = matchLength; /* all smaller will now have at least this guaranteed common length */ + if (matchIndex <= btLow) { smallerPtr=&dummy32; break; } /* beyond tree size, stop the search */ + smallerPtr = nextPtr+1; /* new "smaller" => larger of match */ + matchIndex = nextPtr[1]; /* new matchIndex larger than previous (closer to current) */ + } else { + /* match is larger than current */ + *largerPtr = matchIndex; + commonLengthLarger = matchLength; + if (matchIndex <= btLow) { largerPtr=&dummy32; break; } /* beyond tree size, stop the search */ + largerPtr = nextPtr; + matchIndex = nextPtr[0]; + } } + + *smallerPtr = *largerPtr = 0; + + if (dictMode == ZSTD_dictMatchState && nbCompares) { + bestLength = ZSTD_DUBT_findBetterDictMatch( + ms, ip, iend, + offsetPtr, bestLength, nbCompares, + mls, dictMode); + } + + assert(matchEndIdx > curr+8); /* ensure nextToUpdate is increased */ + ms->nextToUpdate = matchEndIdx - 8; /* skip repetitive patterns */ + if (bestLength >= MINMATCH) { + U32 const mIndex = curr - ((U32)*offsetPtr - ZSTD_REP_MOVE); (void)mIndex; + DEBUGLOG(8, "ZSTD_DUBT_findBestMatch(%u) : found match of length %u and offsetCode %u (pos %u)", + curr, (U32)bestLength, (U32)*offsetPtr, mIndex); + } + return bestLength; + } +} + + +/** ZSTD_BtFindBestMatch() : Tree updater, providing best match */ +FORCE_INLINE_TEMPLATE size_t +ZSTD_BtFindBestMatch( ZSTD_matchState_t* ms, + const BYTE* const ip, const BYTE* const iLimit, + size_t* offsetPtr, + const U32 mls /* template */, + const ZSTD_dictMode_e dictMode) +{ + DEBUGLOG(7, "ZSTD_BtFindBestMatch"); + if (ip < ms->window.base + ms->nextToUpdate) return 0; /* skipped area */ + ZSTD_updateDUBT(ms, ip, iLimit, mls); + return ZSTD_DUBT_findBestMatch(ms, ip, iLimit, offsetPtr, mls, dictMode); +} + + +static size_t +ZSTD_BtFindBestMatch_selectMLS ( ZSTD_matchState_t* ms, + const BYTE* ip, const BYTE* const iLimit, + size_t* offsetPtr) +{ + switch(ms->cParams.minMatch) + { + default : /* includes case 3 */ + case 4 : return ZSTD_BtFindBestMatch(ms, ip, iLimit, offsetPtr, 4, ZSTD_noDict); + case 5 : return ZSTD_BtFindBestMatch(ms, ip, iLimit, offsetPtr, 5, ZSTD_noDict); + case 7 : + case 6 : return ZSTD_BtFindBestMatch(ms, ip, iLimit, offsetPtr, 6, ZSTD_noDict); + } +} + + +static size_t ZSTD_BtFindBestMatch_dictMatchState_selectMLS ( + ZSTD_matchState_t* ms, + const BYTE* ip, const BYTE* const iLimit, + size_t* offsetPtr) +{ + switch(ms->cParams.minMatch) + { + default : /* includes case 3 */ + case 4 : return ZSTD_BtFindBestMatch(ms, ip, iLimit, offsetPtr, 4, ZSTD_dictMatchState); + case 5 : return ZSTD_BtFindBestMatch(ms, ip, iLimit, offsetPtr, 5, ZSTD_dictMatchState); + case 7 : + case 6 : return ZSTD_BtFindBestMatch(ms, ip, iLimit, offsetPtr, 6, ZSTD_dictMatchState); + } +} + + +static size_t ZSTD_BtFindBestMatch_extDict_selectMLS ( + ZSTD_matchState_t* ms, + const BYTE* ip, const BYTE* const iLimit, + size_t* offsetPtr) +{ + switch(ms->cParams.minMatch) + { + default : /* includes case 3 */ + case 4 : return ZSTD_BtFindBestMatch(ms, ip, iLimit, offsetPtr, 4, ZSTD_extDict); + case 5 : return ZSTD_BtFindBestMatch(ms, ip, iLimit, offsetPtr, 5, ZSTD_extDict); + case 7 : + case 6 : return ZSTD_BtFindBestMatch(ms, ip, iLimit, offsetPtr, 6, ZSTD_extDict); + } +} + +/*********************************** +* Dedicated dict search +***********************************/ + +void ZSTD_dedicatedDictSearch_lazy_loadDictionary(ZSTD_matchState_t* ms, const BYTE* const ip) +{ + const BYTE* const base = ms->window.base; + U32 const target = (U32)(ip - base); + U32* const hashTable = ms->hashTable; + U32* const chainTable = ms->chainTable; + U32 const chainSize = 1 << ms->cParams.chainLog; + U32 idx = ms->nextToUpdate; + U32 const minChain = chainSize < target ? target - chainSize : idx; + U32 const bucketSize = 1 << ZSTD_LAZY_DDSS_BUCKET_LOG; + U32 const cacheSize = bucketSize - 1; + U32 const chainAttempts = (1 << ms->cParams.searchLog) - cacheSize; + U32 const chainLimit = chainAttempts > 255 ? 255 : chainAttempts; + + /* We know the hashtable is oversized by a factor of `bucketSize`. + * We are going to temporarily pretend `bucketSize == 1`, keeping only a + * single entry. We will use the rest of the space to construct a temporary + * chaintable. + */ + U32 const hashLog = ms->cParams.hashLog - ZSTD_LAZY_DDSS_BUCKET_LOG; + U32* const tmpHashTable = hashTable; + U32* const tmpChainTable = hashTable + ((size_t)1 << hashLog); + U32 const tmpChainSize = ((1 << ZSTD_LAZY_DDSS_BUCKET_LOG) - 1) << hashLog; + U32 const tmpMinChain = tmpChainSize < target ? target - tmpChainSize : idx; + U32 hashIdx; + + assert(ms->cParams.chainLog <= 24); + assert(ms->cParams.hashLog > ms->cParams.chainLog); + assert(idx != 0); + assert(tmpMinChain <= minChain); + + /* fill conventional hash table and conventional chain table */ + for ( ; idx < target; idx++) { + U32 const h = (U32)ZSTD_hashPtr(base + idx, hashLog, ms->cParams.minMatch); + if (idx >= tmpMinChain) { + tmpChainTable[idx - tmpMinChain] = hashTable[h]; + } + tmpHashTable[h] = idx; + } + + /* sort chains into ddss chain table */ + { + U32 chainPos = 0; + for (hashIdx = 0; hashIdx < (1U << hashLog); hashIdx++) { + U32 count; + U32 countBeyondMinChain = 0; + U32 i = tmpHashTable[hashIdx]; + for (count = 0; i >= tmpMinChain && count < cacheSize; count++) { + /* skip through the chain to the first position that won't be + * in the hash cache bucket */ + if (i < minChain) { + countBeyondMinChain++; + } + i = tmpChainTable[i - tmpMinChain]; + } + if (count == cacheSize) { + for (count = 0; count < chainLimit;) { + if (i < minChain) { + if (!i || ++countBeyondMinChain > cacheSize) { + /* only allow pulling `cacheSize` number of entries + * into the cache or chainTable beyond `minChain`, + * to replace the entries pulled out of the + * chainTable into the cache. This lets us reach + * back further without increasing the total number + * of entries in the chainTable, guaranteeing the + * DDSS chain table will fit into the space + * allocated for the regular one. */ + break; + } + } + chainTable[chainPos++] = i; + count++; + if (i < tmpMinChain) { + break; + } + i = tmpChainTable[i - tmpMinChain]; + } + } else { + count = 0; + } + if (count) { + tmpHashTable[hashIdx] = ((chainPos - count) << 8) + count; + } else { + tmpHashTable[hashIdx] = 0; + } + } + assert(chainPos <= chainSize); /* I believe this is guaranteed... */ + } + + /* move chain pointers into the last entry of each hash bucket */ + for (hashIdx = (1 << hashLog); hashIdx; ) { + U32 const bucketIdx = --hashIdx << ZSTD_LAZY_DDSS_BUCKET_LOG; + U32 const chainPackedPointer = tmpHashTable[hashIdx]; + U32 i; + for (i = 0; i < cacheSize; i++) { + hashTable[bucketIdx + i] = 0; + } + hashTable[bucketIdx + bucketSize - 1] = chainPackedPointer; + } + + /* fill the buckets of the hash table */ + for (idx = ms->nextToUpdate; idx < target; idx++) { + U32 const h = (U32)ZSTD_hashPtr(base + idx, hashLog, ms->cParams.minMatch) + << ZSTD_LAZY_DDSS_BUCKET_LOG; + U32 i; + /* Shift hash cache down 1. */ + for (i = cacheSize - 1; i; i--) + hashTable[h + i] = hashTable[h + i - 1]; + hashTable[h] = idx; + } + + ms->nextToUpdate = target; +} + +/* Returns the longest match length found in the dedicated dict search structure. + * If none are longer than the argument ml, then ml will be returned. + */ +FORCE_INLINE_TEMPLATE +size_t ZSTD_dedicatedDictSearch_lazy_search(size_t* offsetPtr, size_t ml, U32 nbAttempts, + const ZSTD_matchState_t* const dms, + const BYTE* const ip, const BYTE* const iLimit, + const BYTE* const prefixStart, const U32 curr, + const U32 dictLimit, const size_t ddsIdx) { + const U32 ddsLowestIndex = dms->window.dictLimit; + const BYTE* const ddsBase = dms->window.base; + const BYTE* const ddsEnd = dms->window.nextSrc; + const U32 ddsSize = (U32)(ddsEnd - ddsBase); + const U32 ddsIndexDelta = dictLimit - ddsSize; + const U32 bucketSize = (1 << ZSTD_LAZY_DDSS_BUCKET_LOG); + const U32 bucketLimit = nbAttempts < bucketSize - 1 ? nbAttempts : bucketSize - 1; + U32 ddsAttempt; + U32 matchIndex; + + for (ddsAttempt = 0; ddsAttempt < bucketSize - 1; ddsAttempt++) { + PREFETCH_L1(ddsBase + dms->hashTable[ddsIdx + ddsAttempt]); + } + + { + U32 const chainPackedPointer = dms->hashTable[ddsIdx + bucketSize - 1]; + U32 const chainIndex = chainPackedPointer >> 8; + + PREFETCH_L1(&dms->chainTable[chainIndex]); + } + + for (ddsAttempt = 0; ddsAttempt < bucketLimit; ddsAttempt++) { + size_t currentMl=0; + const BYTE* match; + matchIndex = dms->hashTable[ddsIdx + ddsAttempt]; + match = ddsBase + matchIndex; + + if (!matchIndex) { + return ml; + } + + /* guaranteed by table construction */ + (void)ddsLowestIndex; + assert(matchIndex >= ddsLowestIndex); + assert(match+4 <= ddsEnd); + if (MEM_read32(match) == MEM_read32(ip)) { + /* assumption : matchIndex <= dictLimit-4 (by table construction) */ + currentMl = ZSTD_count_2segments(ip+4, match+4, iLimit, ddsEnd, prefixStart) + 4; + } + + /* save best solution */ + if (currentMl > ml) { + ml = currentMl; + *offsetPtr = curr - (matchIndex + ddsIndexDelta) + ZSTD_REP_MOVE; + if (ip+currentMl == iLimit) { + /* best possible, avoids read overflow on next attempt */ + return ml; + } + } + } + + { + U32 const chainPackedPointer = dms->hashTable[ddsIdx + bucketSize - 1]; + U32 chainIndex = chainPackedPointer >> 8; + U32 const chainLength = chainPackedPointer & 0xFF; + U32 const chainAttempts = nbAttempts - ddsAttempt; + U32 const chainLimit = chainAttempts > chainLength ? chainLength : chainAttempts; + U32 chainAttempt; + + for (chainAttempt = 0 ; chainAttempt < chainLimit; chainAttempt++) { + PREFETCH_L1(ddsBase + dms->chainTable[chainIndex + chainAttempt]); + } + + for (chainAttempt = 0 ; chainAttempt < chainLimit; chainAttempt++, chainIndex++) { + size_t currentMl=0; + const BYTE* match; + matchIndex = dms->chainTable[chainIndex]; + match = ddsBase + matchIndex; + + /* guaranteed by table construction */ + assert(matchIndex >= ddsLowestIndex); + assert(match+4 <= ddsEnd); + if (MEM_read32(match) == MEM_read32(ip)) { + /* assumption : matchIndex <= dictLimit-4 (by table construction) */ + currentMl = ZSTD_count_2segments(ip+4, match+4, iLimit, ddsEnd, prefixStart) + 4; + } + + /* save best solution */ + if (currentMl > ml) { + ml = currentMl; + *offsetPtr = curr - (matchIndex + ddsIndexDelta) + ZSTD_REP_MOVE; + if (ip+currentMl == iLimit) break; /* best possible, avoids read overflow on next attempt */ + } + } + } + return ml; +} + + +/* ********************************* +* Hash Chain +***********************************/ +#define NEXT_IN_CHAIN(d, mask) chainTable[(d) & (mask)] + +/* Update chains up to ip (excluded) + Assumption : always within prefix (i.e. not within extDict) */ +FORCE_INLINE_TEMPLATE U32 ZSTD_insertAndFindFirstIndex_internal( + ZSTD_matchState_t* ms, + const ZSTD_compressionParameters* const cParams, + const BYTE* ip, U32 const mls) +{ + U32* const hashTable = ms->hashTable; + const U32 hashLog = cParams->hashLog; + U32* const chainTable = ms->chainTable; + const U32 chainMask = (1 << cParams->chainLog) - 1; + const BYTE* const base = ms->window.base; + const U32 target = (U32)(ip - base); + U32 idx = ms->nextToUpdate; + + while(idx < target) { /* catch up */ + size_t const h = ZSTD_hashPtr(base+idx, hashLog, mls); + NEXT_IN_CHAIN(idx, chainMask) = hashTable[h]; + hashTable[h] = idx; + idx++; + } + + ms->nextToUpdate = target; + return hashTable[ZSTD_hashPtr(ip, hashLog, mls)]; +} + +U32 ZSTD_insertAndFindFirstIndex(ZSTD_matchState_t* ms, const BYTE* ip) { + const ZSTD_compressionParameters* const cParams = &ms->cParams; + return ZSTD_insertAndFindFirstIndex_internal(ms, cParams, ip, ms->cParams.minMatch); +} + +/* inlining is important to hardwire a hot branch (template emulation) */ +FORCE_INLINE_TEMPLATE +size_t ZSTD_HcFindBestMatch_generic ( + ZSTD_matchState_t* ms, + const BYTE* const ip, const BYTE* const iLimit, + size_t* offsetPtr, + const U32 mls, const ZSTD_dictMode_e dictMode) +{ + const ZSTD_compressionParameters* const cParams = &ms->cParams; + U32* const chainTable = ms->chainTable; + const U32 chainSize = (1 << cParams->chainLog); + const U32 chainMask = chainSize-1; + const BYTE* const base = ms->window.base; + const BYTE* const dictBase = ms->window.dictBase; + const U32 dictLimit = ms->window.dictLimit; + const BYTE* const prefixStart = base + dictLimit; + const BYTE* const dictEnd = dictBase + dictLimit; + const U32 curr = (U32)(ip-base); + const U32 maxDistance = 1U << cParams->windowLog; + const U32 lowestValid = ms->window.lowLimit; + const U32 withinMaxDistance = (curr - lowestValid > maxDistance) ? curr - maxDistance : lowestValid; + const U32 isDictionary = (ms->loadedDictEnd != 0); + const U32 lowLimit = isDictionary ? lowestValid : withinMaxDistance; + const U32 minChain = curr > chainSize ? curr - chainSize : 0; + U32 nbAttempts = 1U << cParams->searchLog; + size_t ml=4-1; + + const ZSTD_matchState_t* const dms = ms->dictMatchState; + const U32 ddsHashLog = dictMode == ZSTD_dedicatedDictSearch + ? dms->cParams.hashLog - ZSTD_LAZY_DDSS_BUCKET_LOG : 0; + const size_t ddsIdx = dictMode == ZSTD_dedicatedDictSearch + ? ZSTD_hashPtr(ip, ddsHashLog, mls) << ZSTD_LAZY_DDSS_BUCKET_LOG : 0; + + U32 matchIndex; + + if (dictMode == ZSTD_dedicatedDictSearch) { + const U32* entry = &dms->hashTable[ddsIdx]; + PREFETCH_L1(entry); + } + + /* HC4 match finder */ + matchIndex = ZSTD_insertAndFindFirstIndex_internal(ms, cParams, ip, mls); + + for ( ; (matchIndex>=lowLimit) & (nbAttempts>0) ; nbAttempts--) { + size_t currentMl=0; + if ((dictMode != ZSTD_extDict) || matchIndex >= dictLimit) { + const BYTE* const match = base + matchIndex; + assert(matchIndex >= dictLimit); /* ensures this is true if dictMode != ZSTD_extDict */ + if (match[ml] == ip[ml]) /* potentially better */ + currentMl = ZSTD_count(ip, match, iLimit); + } else { + const BYTE* const match = dictBase + matchIndex; + assert(match+4 <= dictEnd); + if (MEM_read32(match) == MEM_read32(ip)) /* assumption : matchIndex <= dictLimit-4 (by table construction) */ + currentMl = ZSTD_count_2segments(ip+4, match+4, iLimit, dictEnd, prefixStart) + 4; + } + + /* save best solution */ + if (currentMl > ml) { + ml = currentMl; + *offsetPtr = curr - matchIndex + ZSTD_REP_MOVE; + if (ip+currentMl == iLimit) break; /* best possible, avoids read overflow on next attempt */ + } + + if (matchIndex <= minChain) break; + matchIndex = NEXT_IN_CHAIN(matchIndex, chainMask); + } + + if (dictMode == ZSTD_dedicatedDictSearch) { + ml = ZSTD_dedicatedDictSearch_lazy_search(offsetPtr, ml, nbAttempts, dms, + ip, iLimit, prefixStart, curr, dictLimit, ddsIdx); + } else if (dictMode == ZSTD_dictMatchState) { + const U32* const dmsChainTable = dms->chainTable; + const U32 dmsChainSize = (1 << dms->cParams.chainLog); + const U32 dmsChainMask = dmsChainSize - 1; + const U32 dmsLowestIndex = dms->window.dictLimit; + const BYTE* const dmsBase = dms->window.base; + const BYTE* const dmsEnd = dms->window.nextSrc; + const U32 dmsSize = (U32)(dmsEnd - dmsBase); + const U32 dmsIndexDelta = dictLimit - dmsSize; + const U32 dmsMinChain = dmsSize > dmsChainSize ? dmsSize - dmsChainSize : 0; + + matchIndex = dms->hashTable[ZSTD_hashPtr(ip, dms->cParams.hashLog, mls)]; + + for ( ; (matchIndex>=dmsLowestIndex) & (nbAttempts>0) ; nbAttempts--) { + size_t currentMl=0; + const BYTE* const match = dmsBase + matchIndex; + assert(match+4 <= dmsEnd); + if (MEM_read32(match) == MEM_read32(ip)) /* assumption : matchIndex <= dictLimit-4 (by table construction) */ + currentMl = ZSTD_count_2segments(ip+4, match+4, iLimit, dmsEnd, prefixStart) + 4; + + /* save best solution */ + if (currentMl > ml) { + ml = currentMl; + *offsetPtr = curr - (matchIndex + dmsIndexDelta) + ZSTD_REP_MOVE; + if (ip+currentMl == iLimit) break; /* best possible, avoids read overflow on next attempt */ + } + + if (matchIndex <= dmsMinChain) break; + + matchIndex = dmsChainTable[matchIndex & dmsChainMask]; + } + } + + return ml; +} + + +FORCE_INLINE_TEMPLATE size_t ZSTD_HcFindBestMatch_selectMLS ( + ZSTD_matchState_t* ms, + const BYTE* ip, const BYTE* const iLimit, + size_t* offsetPtr) +{ + switch(ms->cParams.minMatch) + { + default : /* includes case 3 */ + case 4 : return ZSTD_HcFindBestMatch_generic(ms, ip, iLimit, offsetPtr, 4, ZSTD_noDict); + case 5 : return ZSTD_HcFindBestMatch_generic(ms, ip, iLimit, offsetPtr, 5, ZSTD_noDict); + case 7 : + case 6 : return ZSTD_HcFindBestMatch_generic(ms, ip, iLimit, offsetPtr, 6, ZSTD_noDict); + } +} + + +static size_t ZSTD_HcFindBestMatch_dictMatchState_selectMLS ( + ZSTD_matchState_t* ms, + const BYTE* ip, const BYTE* const iLimit, + size_t* offsetPtr) +{ + switch(ms->cParams.minMatch) + { + default : /* includes case 3 */ + case 4 : return ZSTD_HcFindBestMatch_generic(ms, ip, iLimit, offsetPtr, 4, ZSTD_dictMatchState); + case 5 : return ZSTD_HcFindBestMatch_generic(ms, ip, iLimit, offsetPtr, 5, ZSTD_dictMatchState); + case 7 : + case 6 : return ZSTD_HcFindBestMatch_generic(ms, ip, iLimit, offsetPtr, 6, ZSTD_dictMatchState); + } +} + + +static size_t ZSTD_HcFindBestMatch_dedicatedDictSearch_selectMLS ( + ZSTD_matchState_t* ms, + const BYTE* ip, const BYTE* const iLimit, + size_t* offsetPtr) +{ + switch(ms->cParams.minMatch) + { + default : /* includes case 3 */ + case 4 : return ZSTD_HcFindBestMatch_generic(ms, ip, iLimit, offsetPtr, 4, ZSTD_dedicatedDictSearch); + case 5 : return ZSTD_HcFindBestMatch_generic(ms, ip, iLimit, offsetPtr, 5, ZSTD_dedicatedDictSearch); + case 7 : + case 6 : return ZSTD_HcFindBestMatch_generic(ms, ip, iLimit, offsetPtr, 6, ZSTD_dedicatedDictSearch); + } +} + + +FORCE_INLINE_TEMPLATE size_t ZSTD_HcFindBestMatch_extDict_selectMLS ( + ZSTD_matchState_t* ms, + const BYTE* ip, const BYTE* const iLimit, + size_t* offsetPtr) +{ + switch(ms->cParams.minMatch) + { + default : /* includes case 3 */ + case 4 : return ZSTD_HcFindBestMatch_generic(ms, ip, iLimit, offsetPtr, 4, ZSTD_extDict); + case 5 : return ZSTD_HcFindBestMatch_generic(ms, ip, iLimit, offsetPtr, 5, ZSTD_extDict); + case 7 : + case 6 : return ZSTD_HcFindBestMatch_generic(ms, ip, iLimit, offsetPtr, 6, ZSTD_extDict); + } +} + +/* ********************************* +* (SIMD) Row-based matchfinder +***********************************/ +/* Constants for row-based hash */ +#define ZSTD_ROW_HASH_TAG_OFFSET 1 /* byte offset of hashes in the match state's tagTable from the beginning of a row */ +#define ZSTD_ROW_HASH_TAG_BITS 8 /* nb bits to use for the tag */ +#define ZSTD_ROW_HASH_TAG_MASK ((1u << ZSTD_ROW_HASH_TAG_BITS) - 1) + +#define ZSTD_ROW_HASH_CACHE_MASK (ZSTD_ROW_HASH_CACHE_SIZE - 1) + +typedef U32 ZSTD_VecMask; /* Clarifies when we are interacting with a U32 representing a mask of matches */ + +#if !defined(ZSTD_NO_INTRINSICS) && defined(__SSE2__) /* SIMD SSE version */ + +#include +typedef __m128i ZSTD_Vec128; + +/* Returns a 128-bit container with 128-bits from src */ +static ZSTD_Vec128 ZSTD_Vec128_read(const void* const src) { + return _mm_loadu_si128((ZSTD_Vec128 const*)src); +} + +/* Returns a ZSTD_Vec128 with the byte "val" packed 16 times */ +static ZSTD_Vec128 ZSTD_Vec128_set8(BYTE val) { + return _mm_set1_epi8((char)val); +} + +/* Do byte-by-byte comparison result of x and y. Then collapse 128-bit resultant mask + * into a 32-bit mask that is the MSB of each byte. + * */ +static ZSTD_VecMask ZSTD_Vec128_cmpMask8(ZSTD_Vec128 x, ZSTD_Vec128 y) { + return (ZSTD_VecMask)_mm_movemask_epi8(_mm_cmpeq_epi8(x, y)); +} + +typedef struct { + __m128i fst; + __m128i snd; +} ZSTD_Vec256; + +static ZSTD_Vec256 ZSTD_Vec256_read(const void* const ptr) { + ZSTD_Vec256 v; + v.fst = ZSTD_Vec128_read(ptr); + v.snd = ZSTD_Vec128_read((ZSTD_Vec128 const*)ptr + 1); + return v; +} + +static ZSTD_Vec256 ZSTD_Vec256_set8(BYTE val) { + ZSTD_Vec256 v; + v.fst = ZSTD_Vec128_set8(val); + v.snd = ZSTD_Vec128_set8(val); + return v; +} + +static ZSTD_VecMask ZSTD_Vec256_cmpMask8(ZSTD_Vec256 x, ZSTD_Vec256 y) { + ZSTD_VecMask fstMask; + ZSTD_VecMask sndMask; + fstMask = ZSTD_Vec128_cmpMask8(x.fst, y.fst); + sndMask = ZSTD_Vec128_cmpMask8(x.snd, y.snd); + return fstMask | (sndMask << 16); +} + +#elif !defined(ZSTD_NO_INTRINSICS) && defined(__ARM_NEON) /* SIMD ARM NEON Version */ + +#include +typedef uint8x16_t ZSTD_Vec128; + +static ZSTD_Vec128 ZSTD_Vec128_read(const void* const src) { + return vld1q_u8((const BYTE* const)src); +} + +static ZSTD_Vec128 ZSTD_Vec128_set8(BYTE val) { + return vdupq_n_u8(val); +} + +/* Mimics '_mm_movemask_epi8()' from SSE */ +static U32 ZSTD_vmovmaskq_u8(ZSTD_Vec128 val) { + /* Shift out everything but the MSB bits in each byte */ + uint16x8_t highBits = vreinterpretq_u16_u8(vshrq_n_u8(val, 7)); + /* Merge the even lanes together with vsra (right shift and add) */ + uint32x4_t paired16 = vreinterpretq_u32_u16(vsraq_n_u16(highBits, highBits, 7)); + uint64x2_t paired32 = vreinterpretq_u64_u32(vsraq_n_u32(paired16, paired16, 14)); + uint8x16_t paired64 = vreinterpretq_u8_u64(vsraq_n_u64(paired32, paired32, 28)); + /* Extract the low 8 bits from each lane, merge */ + return vgetq_lane_u8(paired64, 0) | ((U32)vgetq_lane_u8(paired64, 8) << 8); +} + +static ZSTD_VecMask ZSTD_Vec128_cmpMask8(ZSTD_Vec128 x, ZSTD_Vec128 y) { + return (ZSTD_VecMask)ZSTD_vmovmaskq_u8(vceqq_u8(x, y)); +} + +typedef struct { + uint8x16_t fst; + uint8x16_t snd; +} ZSTD_Vec256; + +static ZSTD_Vec256 ZSTD_Vec256_read(const void* const ptr) { + ZSTD_Vec256 v; + v.fst = ZSTD_Vec128_read(ptr); + v.snd = ZSTD_Vec128_read((ZSTD_Vec128 const*)ptr + 1); + return v; +} + +static ZSTD_Vec256 ZSTD_Vec256_set8(BYTE val) { + ZSTD_Vec256 v; + v.fst = ZSTD_Vec128_set8(val); + v.snd = ZSTD_Vec128_set8(val); + return v; +} + +static ZSTD_VecMask ZSTD_Vec256_cmpMask8(ZSTD_Vec256 x, ZSTD_Vec256 y) { + ZSTD_VecMask fstMask; + ZSTD_VecMask sndMask; + fstMask = ZSTD_Vec128_cmpMask8(x.fst, y.fst); + sndMask = ZSTD_Vec128_cmpMask8(x.snd, y.snd); + return fstMask | (sndMask << 16); +} + +#else /* Scalar fallback version */ + +#define VEC128_NB_SIZE_T (16 / sizeof(size_t)) +typedef struct { + size_t vec[VEC128_NB_SIZE_T]; +} ZSTD_Vec128; + +static ZSTD_Vec128 ZSTD_Vec128_read(const void* const src) { + ZSTD_Vec128 ret; + ZSTD_memcpy(ret.vec, src, VEC128_NB_SIZE_T*sizeof(size_t)); + return ret; +} + +static ZSTD_Vec128 ZSTD_Vec128_set8(BYTE val) { + ZSTD_Vec128 ret = { {0} }; + int startBit = sizeof(size_t) * 8 - 8; + for (;startBit >= 0; startBit -= 8) { + unsigned j = 0; + for (;j < VEC128_NB_SIZE_T; ++j) { + ret.vec[j] |= ((size_t)val << startBit); + } + } + return ret; +} + +/* Compare x to y, byte by byte, generating a "matches" bitfield */ +static ZSTD_VecMask ZSTD_Vec128_cmpMask8(ZSTD_Vec128 x, ZSTD_Vec128 y) { + ZSTD_VecMask res = 0; + unsigned i = 0; + unsigned l = 0; + for (; i < VEC128_NB_SIZE_T; ++i) { + const size_t cmp1 = x.vec[i]; + const size_t cmp2 = y.vec[i]; + unsigned j = 0; + for (; j < sizeof(size_t); ++j, ++l) { + if (((cmp1 >> j*8) & 0xFF) == ((cmp2 >> j*8) & 0xFF)) { + res |= ((U32)1 << (j+i*sizeof(size_t))); + } + } + } + return res; +} + +#define VEC256_NB_SIZE_T 2*VEC128_NB_SIZE_T +typedef struct { + size_t vec[VEC256_NB_SIZE_T]; +} ZSTD_Vec256; + +static ZSTD_Vec256 ZSTD_Vec256_read(const void* const src) { + ZSTD_Vec256 ret; + ZSTD_memcpy(ret.vec, src, VEC256_NB_SIZE_T*sizeof(size_t)); + return ret; +} + +static ZSTD_Vec256 ZSTD_Vec256_set8(BYTE val) { + ZSTD_Vec256 ret = { {0} }; + int startBit = sizeof(size_t) * 8 - 8; + for (;startBit >= 0; startBit -= 8) { + unsigned j = 0; + for (;j < VEC256_NB_SIZE_T; ++j) { + ret.vec[j] |= ((size_t)val << startBit); + } + } + return ret; +} + +/* Compare x to y, byte by byte, generating a "matches" bitfield */ +static ZSTD_VecMask ZSTD_Vec256_cmpMask8(ZSTD_Vec256 x, ZSTD_Vec256 y) { + ZSTD_VecMask res = 0; + unsigned i = 0; + unsigned l = 0; + for (; i < VEC256_NB_SIZE_T; ++i) { + const size_t cmp1 = x.vec[i]; + const size_t cmp2 = y.vec[i]; + unsigned j = 0; + for (; j < sizeof(size_t); ++j, ++l) { + if (((cmp1 >> j*8) & 0xFF) == ((cmp2 >> j*8) & 0xFF)) { + res |= ((U32)1 << (j+i*sizeof(size_t))); + } + } + } + return res; +} + +#endif /* !defined(ZSTD_NO_INTRINSICS) && defined(__SSE2__) */ + +/* ZSTD_VecMask_next(): + * Starting from the LSB, returns the idx of the next non-zero bit. + * Basically counting the nb of trailing zeroes. + */ +static U32 ZSTD_VecMask_next(ZSTD_VecMask val) { +# if defined(_MSC_VER) /* Visual */ + unsigned long r=0; + return _BitScanForward(&r, val) ? (U32)r : 0; +# elif defined(__GNUC__) && (__GNUC__ >= 3) + return (U32)__builtin_ctz(val); +# else + /* Software ctz version: http://graphics.stanford.edu/~seander/bithacks.html#ZerosOnRightMultLookup */ + static const U32 multiplyDeBruijnBitPosition[32] = + { + 0, 1, 28, 2, 29, 14, 24, 3, 30, 22, 20, 15, 25, 17, 4, 8, + 31, 27, 13, 23, 21, 19, 16, 7, 26, 12, 18, 6, 11, 5, 10, 9 + }; + return multiplyDeBruijnBitPosition[((U32)((v & -(int)v) * 0x077CB531U)) >> 27]; +# endif +} + +/* ZSTD_VecMask_rotateRight(): + * Rotates a bitfield to the right by "rotation" bits. + * If the rotation is greater than totalBits, the returned mask is 0. + */ +FORCE_INLINE_TEMPLATE ZSTD_VecMask +ZSTD_VecMask_rotateRight(ZSTD_VecMask mask, U32 const rotation, U32 const totalBits) { + if (rotation == 0) + return mask; + switch (totalBits) { + default: + assert(0); + case 16: + return (mask >> rotation) | (U16)(mask << (16 - rotation)); + case 32: + return (mask >> rotation) | (U32)(mask << (32 - rotation)); + } +} + +/* ZSTD_row_nextIndex(): + * Returns the next index to insert at within a tagTable row, and updates the "head" + * value to reflect the update. Essentially cycles backwards from [0, {entries per row}) + */ +FORCE_INLINE_TEMPLATE U32 ZSTD_row_nextIndex(BYTE* const tagRow, U32 const rowMask) { + U32 const next = (*tagRow - 1) & rowMask; + *tagRow = (BYTE)next; + return next; +} + +/* ZSTD_isAligned(): + * Checks that a pointer is aligned to "align" bytes which must be a power of 2. + */ +MEM_STATIC int ZSTD_isAligned(void const* ptr, size_t align) { + assert((align & (align - 1)) == 0); + return (((size_t)ptr) & (align - 1)) == 0; +} + +/* ZSTD_row_prefetch(): + * Performs prefetching for the hashTable and tagTable at a given row. + */ +FORCE_INLINE_TEMPLATE void ZSTD_row_prefetch(U32 const* hashTable, U16 const* tagTable, U32 const relRow, U32 const rowLog) { + PREFETCH_L1(hashTable + relRow); + if (rowLog == 5) { + PREFETCH_L1(hashTable + relRow + 16); + } + PREFETCH_L1(tagTable + relRow); + assert(rowLog == 4 || rowLog == 5); + assert(ZSTD_isAligned(hashTable + relRow, 64)); /* prefetched hash row always 64-byte aligned */ + assert(ZSTD_isAligned(tagTable + relRow, (size_t)1 << rowLog)); /* prefetched tagRow sits on a multiple of 32 or 64 bytes */ +} + +/* ZSTD_row_fillHashCache(): + * Fill up the hash cache starting at idx, prefetching up to ZSTD_ROW_HASH_CACHE_SIZE entries, + * but not beyond iLimit. + */ +static void ZSTD_row_fillHashCache(ZSTD_matchState_t* ms, const BYTE* base, + U32 const rowLog, U32 const mls, + U32 idx, const BYTE* const iLimit) +{ + U32 const* const hashTable = ms->hashTable; + U16 const* const tagTable = ms->tagTable; + U32 const hashLog = ms->rowHashLog; + U32 const maxElemsToPrefetch = (base + idx) > iLimit ? 0 : (U32)(iLimit - (base + idx) + 1); + U32 const lim = idx + MIN(ZSTD_ROW_HASH_CACHE_SIZE, maxElemsToPrefetch); + + for (; idx < lim; ++idx) { + U32 const hash = (U32)ZSTD_hashPtr(base + idx, hashLog + ZSTD_ROW_HASH_TAG_BITS, mls); + U32 const row = (hash >> ZSTD_ROW_HASH_TAG_BITS) << rowLog; + ZSTD_row_prefetch(hashTable, tagTable, row, rowLog); + ms->hashCache[idx & ZSTD_ROW_HASH_CACHE_MASK] = hash; + } + + DEBUGLOG(6, "ZSTD_row_fillHashCache(): [%u %u %u %u %u %u %u %u]", ms->hashCache[0], ms->hashCache[1], + ms->hashCache[2], ms->hashCache[3], ms->hashCache[4], + ms->hashCache[5], ms->hashCache[6], ms->hashCache[7]); +} + +/* ZSTD_row_nextCachedHash(): + * Returns the hash of base + idx, and replaces the hash in the hash cache with the byte at + * base + idx + ZSTD_ROW_HASH_CACHE_SIZE. Also prefetches the appropriate rows from hashTable and tagTable. + */ +FORCE_INLINE_TEMPLATE U32 ZSTD_row_nextCachedHash(U32* cache, U32 const* hashTable, + U16 const* tagTable, BYTE const* base, + U32 idx, U32 const hashLog, + U32 const rowLog, U32 const mls) +{ + U32 const newHash = (U32)ZSTD_hashPtr(base+idx+ZSTD_ROW_HASH_CACHE_SIZE, hashLog + ZSTD_ROW_HASH_TAG_BITS, mls); + U32 const row = (newHash >> ZSTD_ROW_HASH_TAG_BITS) << rowLog; + ZSTD_row_prefetch(hashTable, tagTable, row, rowLog); + { U32 const hash = cache[idx & ZSTD_ROW_HASH_CACHE_MASK]; + cache[idx & ZSTD_ROW_HASH_CACHE_MASK] = newHash; + return hash; + } +} + +/* ZSTD_row_update_internal(): + * Inserts the byte at ip into the appropriate position in the hash table. + * Determines the relative row, and the position within the {16, 32} entry row to insert at. + */ +FORCE_INLINE_TEMPLATE void ZSTD_row_update_internal(ZSTD_matchState_t* ms, const BYTE* ip, + U32 const mls, U32 const rowLog, + U32 const rowMask, U32 const useCache) +{ + U32* const hashTable = ms->hashTable; + U16* const tagTable = ms->tagTable; + U32 const hashLog = ms->rowHashLog; + const BYTE* const base = ms->window.base; + const U32 target = (U32)(ip - base); + U32 idx = ms->nextToUpdate; + + DEBUGLOG(6, "ZSTD_row_update_internal(): nextToUpdate=%u, current=%u", idx, target); + for (; idx < target; ++idx) { + U32 const hash = useCache ? ZSTD_row_nextCachedHash(ms->hashCache, hashTable, tagTable, base, idx, hashLog, rowLog, mls) + : (U32)ZSTD_hashPtr(base + idx, hashLog + ZSTD_ROW_HASH_TAG_BITS, mls); + U32 const relRow = (hash >> ZSTD_ROW_HASH_TAG_BITS) << rowLog; + U32* const row = hashTable + relRow; + BYTE* tagRow = (BYTE*)(tagTable + relRow); /* Though tagTable is laid out as a table of U16, each tag is only 1 byte. + Explicit cast allows us to get exact desired position within each row */ + U32 const pos = ZSTD_row_nextIndex(tagRow, rowMask); + + assert(hash == ZSTD_hashPtr(base + idx, hashLog + ZSTD_ROW_HASH_TAG_BITS, mls)); + ((BYTE*)tagRow)[pos + ZSTD_ROW_HASH_TAG_OFFSET] = hash & ZSTD_ROW_HASH_TAG_MASK; + row[pos] = idx; + } + ms->nextToUpdate = target; +} + +/* ZSTD_row_update(): + * External wrapper for ZSTD_row_update_internal(). Used for filling the hashtable during dictionary + * processing. + */ +void ZSTD_row_update(ZSTD_matchState_t* const ms, const BYTE* ip) { + const U32 rowLog = ms->cParams.searchLog < 5 ? 4 : 5; + const U32 rowMask = (1u << rowLog) - 1; + const U32 mls = MIN(ms->cParams.minMatch, 6 /* mls caps out at 6 */); + + DEBUGLOG(5, "ZSTD_row_update(), rowLog=%u", rowLog); + ZSTD_row_update_internal(ms, ip, mls, rowLog, rowMask, 0 /* dont use cache */); +} + +/* Returns a ZSTD_VecMask (U32) that has the nth bit set to 1 if the newly-computed "tag" matches + * the hash at the nth position in a row of the tagTable. + */ +FORCE_INLINE_TEMPLATE +ZSTD_VecMask ZSTD_row_getMatchMask(const BYTE* const tagRow, const BYTE tag, const U32 head, const U32 rowEntries) { + ZSTD_VecMask matches = 0; + if (rowEntries == 16) { + ZSTD_Vec128 hashes = ZSTD_Vec128_read(tagRow + ZSTD_ROW_HASH_TAG_OFFSET); + ZSTD_Vec128 expandedTags = ZSTD_Vec128_set8(tag); + matches = ZSTD_Vec128_cmpMask8(hashes, expandedTags); + } else if (rowEntries == 32) { + ZSTD_Vec256 hashes = ZSTD_Vec256_read(tagRow + ZSTD_ROW_HASH_TAG_OFFSET); + ZSTD_Vec256 expandedTags = ZSTD_Vec256_set8(tag); + matches = ZSTD_Vec256_cmpMask8(hashes, expandedTags); + } else { + assert(0); + } + /* Each row is a circular buffer beginning at the value of "head". So we must rotate the "matches" bitfield + to match up with the actual layout of the entries within the hashTable */ + return ZSTD_VecMask_rotateRight(matches, head, rowEntries); +} + +/* The high-level approach of the SIMD row based match finder is as follows: + * - Figure out where to insert the new entry: + * - Generate a hash from a byte along with an additional 1-byte "short hash". The additional byte is our "tag" + * - The hashTable is effectively split into groups or "rows" of 16 or 32 entries of U32, and the hash determines + * which row to insert into. + * - Determine the correct position within the row to insert the entry into. Each row of 16 or 32 can + * be considered as a circular buffer with a "head" index that resides in the tagTable. + * - Also insert the "tag" into the equivalent row and position in the tagTable. + * - Note: The tagTable has 17 or 33 1-byte entries per row, due to 16 or 32 tags, and 1 "head" entry. + * The 17 or 33 entry rows are spaced out to occur every 32 or 64 bytes, respectively, + * for alignment/performance reasons, leaving some bytes unused. + * - Use SIMD to efficiently compare the tags in the tagTable to the 1-byte "short hash" and + * generate a bitfield that we can cycle through to check the collisions in the hash table. + * - Pick the longest match. + */ +FORCE_INLINE_TEMPLATE +size_t ZSTD_RowFindBestMatch_generic ( + ZSTD_matchState_t* ms, + const BYTE* const ip, const BYTE* const iLimit, + size_t* offsetPtr, + const U32 mls, const ZSTD_dictMode_e dictMode, + const U32 rowLog) +{ + U32* const hashTable = ms->hashTable; + U16* const tagTable = ms->tagTable; + U32* const hashCache = ms->hashCache; + const U32 hashLog = ms->rowHashLog; + const ZSTD_compressionParameters* const cParams = &ms->cParams; + const BYTE* const base = ms->window.base; + const BYTE* const dictBase = ms->window.dictBase; + const U32 dictLimit = ms->window.dictLimit; + const BYTE* const prefixStart = base + dictLimit; + const BYTE* const dictEnd = dictBase + dictLimit; + const U32 curr = (U32)(ip-base); + const U32 maxDistance = 1U << cParams->windowLog; + const U32 lowestValid = ms->window.lowLimit; + const U32 withinMaxDistance = (curr - lowestValid > maxDistance) ? curr - maxDistance : lowestValid; + const U32 isDictionary = (ms->loadedDictEnd != 0); + const U32 lowLimit = isDictionary ? lowestValid : withinMaxDistance; + const U32 rowEntries = (1U << rowLog); + const U32 rowMask = rowEntries - 1; + const U32 cappedSearchLog = MIN(cParams->searchLog, rowLog); /* nb of searches is capped at nb entries per row */ + U32 nbAttempts = 1U << cappedSearchLog; + size_t ml=4-1; + + /* DMS/DDS variables that may be referenced laster */ + const ZSTD_matchState_t* const dms = ms->dictMatchState; + size_t ddsIdx; + U32 ddsExtraAttempts; /* cctx hash tables are limited in searches, but allow extra searches into DDS */ + U32 dmsTag; + U32* dmsRow; + BYTE* dmsTagRow; + + if (dictMode == ZSTD_dedicatedDictSearch) { + const U32 ddsHashLog = dms->cParams.hashLog - ZSTD_LAZY_DDSS_BUCKET_LOG; + { /* Prefetch DDS hashtable entry */ + ddsIdx = ZSTD_hashPtr(ip, ddsHashLog, mls) << ZSTD_LAZY_DDSS_BUCKET_LOG; + PREFETCH_L1(&dms->hashTable[ddsIdx]); + } + ddsExtraAttempts = cParams->searchLog > rowLog ? 1U << (cParams->searchLog - rowLog) : 0; + } + + if (dictMode == ZSTD_dictMatchState) { + /* Prefetch DMS rows */ + U32* const dmsHashTable = dms->hashTable; + U16* const dmsTagTable = dms->tagTable; + U32 const dmsHash = (U32)ZSTD_hashPtr(ip, dms->rowHashLog + ZSTD_ROW_HASH_TAG_BITS, mls); + U32 const dmsRelRow = (dmsHash >> ZSTD_ROW_HASH_TAG_BITS) << rowLog; + dmsTag = dmsHash & ZSTD_ROW_HASH_TAG_MASK; + dmsTagRow = (BYTE*)(dmsTagTable + dmsRelRow); + dmsRow = dmsHashTable + dmsRelRow; + ZSTD_row_prefetch(dmsHashTable, dmsTagTable, dmsRelRow, rowLog); + } + + /* Update the hashTable and tagTable up to (but not including) ip */ + ZSTD_row_update_internal(ms, ip, mls, rowLog, rowMask, 1 /* useCache */); + { /* Get the hash for ip, compute the appropriate row */ + U32 const hash = ZSTD_row_nextCachedHash(hashCache, hashTable, tagTable, base, curr, hashLog, rowLog, mls); + U32 const relRow = (hash >> ZSTD_ROW_HASH_TAG_BITS) << rowLog; + U32 const tag = hash & ZSTD_ROW_HASH_TAG_MASK; + U32* const row = hashTable + relRow; + BYTE* tagRow = (BYTE*)(tagTable + relRow); + U32 const head = *tagRow & rowMask; + U32 matchBuffer[32 /* maximum nb entries per row */]; + size_t numMatches = 0; + size_t currMatch = 0; + ZSTD_VecMask matches = ZSTD_row_getMatchMask(tagRow, (BYTE)tag, head, rowEntries); + + /* Cycle through the matches and prefetch */ + for (; (matches > 0) && (nbAttempts > 0); --nbAttempts, matches &= (matches - 1)) { + U32 const matchPos = (head + ZSTD_VecMask_next(matches)) & rowMask; + U32 const matchIndex = row[matchPos]; + assert(numMatches < rowEntries); + if (matchIndex < lowLimit) + break; + if ((dictMode != ZSTD_extDict) || matchIndex >= dictLimit) { + PREFETCH_L1(base + matchIndex); + } else { + PREFETCH_L1(dictBase + matchIndex); + } + matchBuffer[numMatches++] = matchIndex; + } + + /* Speed opt: insert current byte into hashtable too. This allows us to avoid one iteration of the loop + in ZSTD_row_update_internal() at the next search. */ + { + U32 const pos = ZSTD_row_nextIndex(tagRow, rowMask); + tagRow[pos + ZSTD_ROW_HASH_TAG_OFFSET] = (BYTE)tag; + row[pos] = ms->nextToUpdate++; + } + + /* Return the longest match */ + for (; currMatch < numMatches; ++currMatch) { + U32 const matchIndex = matchBuffer[currMatch]; + size_t currentMl=0; + assert(matchIndex < curr); + assert(matchIndex >= lowLimit); + + if ((dictMode != ZSTD_extDict) || matchIndex >= dictLimit) { + const BYTE* const match = base + matchIndex; + assert(matchIndex >= dictLimit); /* ensures this is true if dictMode != ZSTD_extDict */ + if (match[ml] == ip[ml]) /* potentially better */ + currentMl = ZSTD_count(ip, match, iLimit); + } else { + const BYTE* const match = dictBase + matchIndex; + assert(match+4 <= dictEnd); + if (MEM_read32(match) == MEM_read32(ip)) /* assumption : matchIndex <= dictLimit-4 (by table construction) */ + currentMl = ZSTD_count_2segments(ip+4, match+4, iLimit, dictEnd, prefixStart) + 4; + } + + /* Save best solution */ + if (currentMl > ml) { + ml = currentMl; + *offsetPtr = curr - matchIndex + ZSTD_REP_MOVE; + if (ip+currentMl == iLimit) break; /* best possible, avoids read overflow on next attempt */ + } + } + } + + if (dictMode == ZSTD_dedicatedDictSearch) { + ml = ZSTD_dedicatedDictSearch_lazy_search(offsetPtr, ml, nbAttempts + ddsExtraAttempts, dms, + ip, iLimit, prefixStart, curr, dictLimit, ddsIdx); + } else if (dictMode == ZSTD_dictMatchState) { + /* TODO: Measure and potentially add prefetching to DMS */ + const U32 dmsLowestIndex = dms->window.dictLimit; + const BYTE* const dmsBase = dms->window.base; + const BYTE* const dmsEnd = dms->window.nextSrc; + const U32 dmsSize = (U32)(dmsEnd - dmsBase); + const U32 dmsIndexDelta = dictLimit - dmsSize; + + { U32 const head = *dmsTagRow & rowMask; + U32 matchBuffer[32 /* maximum nb row entries */]; + size_t numMatches = 0; + size_t currMatch = 0; + ZSTD_VecMask matches = ZSTD_row_getMatchMask(dmsTagRow, (BYTE)dmsTag, head, rowEntries); + + for (; (matches > 0) && (nbAttempts > 0); --nbAttempts, matches &= (matches - 1)) { + U32 const matchPos = (head + ZSTD_VecMask_next(matches)) & rowMask; + U32 const matchIndex = dmsRow[matchPos]; + if (matchIndex < dmsLowestIndex) + break; + PREFETCH_L1(dmsBase + matchIndex); + matchBuffer[numMatches++] = matchIndex; + } + + /* Return the longest match */ + for (; currMatch < numMatches; ++currMatch) { + U32 const matchIndex = matchBuffer[currMatch]; + size_t currentMl=0; + assert(matchIndex >= dmsLowestIndex); + assert(matchIndex < curr); + + { const BYTE* const match = dmsBase + matchIndex; + assert(match+4 <= dmsEnd); + if (MEM_read32(match) == MEM_read32(ip)) + currentMl = ZSTD_count_2segments(ip+4, match+4, iLimit, dmsEnd, prefixStart) + 4; + } + + if (currentMl > ml) { + ml = currentMl; + *offsetPtr = curr - (matchIndex + dmsIndexDelta) + ZSTD_REP_MOVE; + if (ip+currentMl == iLimit) break; + } + } + } + } + return ml; +} + +/* Inlining is important to hardwire a hot branch (template emulation) */ +FORCE_INLINE_TEMPLATE size_t ZSTD_RowFindBestMatch_selectMLS ( + ZSTD_matchState_t* ms, + const BYTE* ip, const BYTE* const iLimit, + const ZSTD_dictMode_e dictMode, size_t* offsetPtr, const U32 rowLog) +{ + switch(ms->cParams.minMatch) + { + default : /* includes case 3 */ + case 4 : return ZSTD_RowFindBestMatch_generic(ms, ip, iLimit, offsetPtr, 4, dictMode, rowLog); + case 5 : return ZSTD_RowFindBestMatch_generic(ms, ip, iLimit, offsetPtr, 5, dictMode, rowLog); + case 7 : + case 6 : return ZSTD_RowFindBestMatch_generic(ms, ip, iLimit, offsetPtr, 6, dictMode, rowLog); + } +} + +FORCE_INLINE_TEMPLATE size_t ZSTD_RowFindBestMatch_selectRowLog ( + ZSTD_matchState_t* ms, + const BYTE* ip, const BYTE* const iLimit, + size_t* offsetPtr) +{ + const U32 cappedSearchLog = MIN(ms->cParams.searchLog, 5); + switch(cappedSearchLog) + { + default : + case 4 : return ZSTD_RowFindBestMatch_selectMLS(ms, ip, iLimit, ZSTD_noDict, offsetPtr, 4); + case 5 : return ZSTD_RowFindBestMatch_selectMLS(ms, ip, iLimit, ZSTD_noDict, offsetPtr, 5); + } +} + +FORCE_INLINE_TEMPLATE size_t ZSTD_RowFindBestMatch_dictMatchState_selectRowLog( + ZSTD_matchState_t* ms, + const BYTE* ip, const BYTE* const iLimit, + size_t* offsetPtr) +{ + const U32 cappedSearchLog = MIN(ms->cParams.searchLog, 5); + switch(cappedSearchLog) + { + default : + case 4 : return ZSTD_RowFindBestMatch_selectMLS(ms, ip, iLimit, ZSTD_dictMatchState, offsetPtr, 4); + case 5 : return ZSTD_RowFindBestMatch_selectMLS(ms, ip, iLimit, ZSTD_dictMatchState, offsetPtr, 5); + } +} + +FORCE_INLINE_TEMPLATE size_t ZSTD_RowFindBestMatch_dedicatedDictSearch_selectRowLog( + ZSTD_matchState_t* ms, + const BYTE* ip, const BYTE* const iLimit, + size_t* offsetPtr) +{ + const U32 cappedSearchLog = MIN(ms->cParams.searchLog, 5); + switch(cappedSearchLog) + { + default : + case 4 : return ZSTD_RowFindBestMatch_selectMLS(ms, ip, iLimit, ZSTD_dedicatedDictSearch, offsetPtr, 4); + case 5 : return ZSTD_RowFindBestMatch_selectMLS(ms, ip, iLimit, ZSTD_dedicatedDictSearch, offsetPtr, 5); + } +} + +FORCE_INLINE_TEMPLATE size_t ZSTD_RowFindBestMatch_extDict_selectRowLog ( + ZSTD_matchState_t* ms, + const BYTE* ip, const BYTE* const iLimit, + size_t* offsetPtr) +{ + const U32 cappedSearchLog = MIN(ms->cParams.searchLog, 5); + switch(cappedSearchLog) + { + default : + case 4 : return ZSTD_RowFindBestMatch_selectMLS(ms, ip, iLimit, ZSTD_extDict, offsetPtr, 4); + case 5 : return ZSTD_RowFindBestMatch_selectMLS(ms, ip, iLimit, ZSTD_extDict, offsetPtr, 5); + } +} + + +/* ******************************* +* Common parser - lazy strategy +*********************************/ +typedef enum { search_hashChain=0, search_binaryTree=1, search_rowHash=2 } searchMethod_e; + +FORCE_INLINE_TEMPLATE size_t +ZSTD_compressBlock_lazy_generic( + ZSTD_matchState_t* ms, seqStore_t* seqStore, + U32 rep[ZSTD_REP_NUM], + const void* src, size_t srcSize, + const searchMethod_e searchMethod, const U32 depth, + ZSTD_dictMode_e const dictMode) +{ + const BYTE* const istart = (const BYTE*)src; + const BYTE* ip = istart; + const BYTE* anchor = istart; + const BYTE* const iend = istart + srcSize; + const BYTE* const ilimit = searchMethod == search_rowHash ? iend - 8 - ZSTD_ROW_HASH_CACHE_SIZE : iend - 8; + const BYTE* const base = ms->window.base; + const U32 prefixLowestIndex = ms->window.dictLimit; + const BYTE* const prefixLowest = base + prefixLowestIndex; + const U32 rowLog = ms->cParams.searchLog < 5 ? 4 : 5; + + typedef size_t (*searchMax_f)( + ZSTD_matchState_t* ms, + const BYTE* ip, const BYTE* iLimit, size_t* offsetPtr); + + /** + * This table is indexed first by the four ZSTD_dictMode_e values, and then + * by the two searchMethod_e values. NULLs are placed for configurations + * that should never occur (extDict modes go to the other implementation + * below and there is no DDSS for binary tree search yet). + */ + const searchMax_f searchFuncs[4][3] = { + { + ZSTD_HcFindBestMatch_selectMLS, + ZSTD_BtFindBestMatch_selectMLS, + ZSTD_RowFindBestMatch_selectRowLog + }, + { + NULL, + NULL, + NULL + }, + { + ZSTD_HcFindBestMatch_dictMatchState_selectMLS, + ZSTD_BtFindBestMatch_dictMatchState_selectMLS, + ZSTD_RowFindBestMatch_dictMatchState_selectRowLog + }, + { + ZSTD_HcFindBestMatch_dedicatedDictSearch_selectMLS, + NULL, + ZSTD_RowFindBestMatch_dedicatedDictSearch_selectRowLog + } + }; + + searchMax_f const searchMax = searchFuncs[dictMode][(int)searchMethod]; + U32 offset_1 = rep[0], offset_2 = rep[1], savedOffset=0; + + const int isDMS = dictMode == ZSTD_dictMatchState; + const int isDDS = dictMode == ZSTD_dedicatedDictSearch; + const int isDxS = isDMS || isDDS; + const ZSTD_matchState_t* const dms = ms->dictMatchState; + const U32 dictLowestIndex = isDxS ? dms->window.dictLimit : 0; + const BYTE* const dictBase = isDxS ? dms->window.base : NULL; + const BYTE* const dictLowest = isDxS ? dictBase + dictLowestIndex : NULL; + const BYTE* const dictEnd = isDxS ? dms->window.nextSrc : NULL; + const U32 dictIndexDelta = isDxS ? + prefixLowestIndex - (U32)(dictEnd - dictBase) : + 0; + const U32 dictAndPrefixLength = (U32)((ip - prefixLowest) + (dictEnd - dictLowest)); + + assert(searchMax != NULL); + + DEBUGLOG(5, "ZSTD_compressBlock_lazy_generic (dictMode=%u) (searchFunc=%u)", (U32)dictMode, (U32)searchMethod); + ip += (dictAndPrefixLength == 0); + if (dictMode == ZSTD_noDict) { + U32 const curr = (U32)(ip - base); + U32 const windowLow = ZSTD_getLowestPrefixIndex(ms, curr, ms->cParams.windowLog); + U32 const maxRep = curr - windowLow; + if (offset_2 > maxRep) savedOffset = offset_2, offset_2 = 0; + if (offset_1 > maxRep) savedOffset = offset_1, offset_1 = 0; + } + if (isDxS) { + /* dictMatchState repCode checks don't currently handle repCode == 0 + * disabling. */ + assert(offset_1 <= dictAndPrefixLength); + assert(offset_2 <= dictAndPrefixLength); + } + + if (searchMethod == search_rowHash) { + ZSTD_row_fillHashCache(ms, base, rowLog, + MIN(ms->cParams.minMatch, 6 /* mls caps out at 6 */), + ms->nextToUpdate, ilimit); + } + + /* Match Loop */ +#if defined(__GNUC__) && defined(__x86_64__) + /* I've measured random a 5% speed loss on levels 5 & 6 (greedy) when the + * code alignment is perturbed. To fix the instability align the loop on 32-bytes. + */ + __asm__(".p2align 5"); +#endif + while (ip < ilimit) { + size_t matchLength=0; + size_t offset=0; + const BYTE* start=ip+1; + + /* check repCode */ + if (isDxS) { + const U32 repIndex = (U32)(ip - base) + 1 - offset_1; + const BYTE* repMatch = ((dictMode == ZSTD_dictMatchState || dictMode == ZSTD_dedicatedDictSearch) + && repIndex < prefixLowestIndex) ? + dictBase + (repIndex - dictIndexDelta) : + base + repIndex; + if (((U32)((prefixLowestIndex-1) - repIndex) >= 3 /* intentional underflow */) + && (MEM_read32(repMatch) == MEM_read32(ip+1)) ) { + const BYTE* repMatchEnd = repIndex < prefixLowestIndex ? dictEnd : iend; + matchLength = ZSTD_count_2segments(ip+1+4, repMatch+4, iend, repMatchEnd, prefixLowest) + 4; + if (depth==0) goto _storeSequence; + } + } + if ( dictMode == ZSTD_noDict + && ((offset_1 > 0) & (MEM_read32(ip+1-offset_1) == MEM_read32(ip+1)))) { + matchLength = ZSTD_count(ip+1+4, ip+1+4-offset_1, iend) + 4; + if (depth==0) goto _storeSequence; + } + + /* first search (depth 0) */ + { size_t offsetFound = 999999999; + size_t const ml2 = searchMax(ms, ip, iend, &offsetFound); + if (ml2 > matchLength) + matchLength = ml2, start = ip, offset=offsetFound; + } + + if (matchLength < 4) { + ip += ((ip-anchor) >> kSearchStrength) + 1; /* jump faster over incompressible sections */ + continue; + } + + /* let's try to find a better solution */ + if (depth>=1) + while (ip0) & (MEM_read32(ip) == MEM_read32(ip - offset_1)))) { + size_t const mlRep = ZSTD_count(ip+4, ip+4-offset_1, iend) + 4; + int const gain2 = (int)(mlRep * 3); + int const gain1 = (int)(matchLength*3 - ZSTD_highbit32((U32)offset+1) + 1); + if ((mlRep >= 4) && (gain2 > gain1)) + matchLength = mlRep, offset = 0, start = ip; + } + if (isDxS) { + const U32 repIndex = (U32)(ip - base) - offset_1; + const BYTE* repMatch = repIndex < prefixLowestIndex ? + dictBase + (repIndex - dictIndexDelta) : + base + repIndex; + if (((U32)((prefixLowestIndex-1) - repIndex) >= 3 /* intentional underflow */) + && (MEM_read32(repMatch) == MEM_read32(ip)) ) { + const BYTE* repMatchEnd = repIndex < prefixLowestIndex ? dictEnd : iend; + size_t const mlRep = ZSTD_count_2segments(ip+4, repMatch+4, iend, repMatchEnd, prefixLowest) + 4; + int const gain2 = (int)(mlRep * 3); + int const gain1 = (int)(matchLength*3 - ZSTD_highbit32((U32)offset+1) + 1); + if ((mlRep >= 4) && (gain2 > gain1)) + matchLength = mlRep, offset = 0, start = ip; + } + } + { size_t offset2=999999999; + size_t const ml2 = searchMax(ms, ip, iend, &offset2); + int const gain2 = (int)(ml2*4 - ZSTD_highbit32((U32)offset2+1)); /* raw approx */ + int const gain1 = (int)(matchLength*4 - ZSTD_highbit32((U32)offset+1) + 4); + if ((ml2 >= 4) && (gain2 > gain1)) { + matchLength = ml2, offset = offset2, start = ip; + continue; /* search a better one */ + } } + + /* let's find an even better one */ + if ((depth==2) && (ip0) & (MEM_read32(ip) == MEM_read32(ip - offset_1)))) { + size_t const mlRep = ZSTD_count(ip+4, ip+4-offset_1, iend) + 4; + int const gain2 = (int)(mlRep * 4); + int const gain1 = (int)(matchLength*4 - ZSTD_highbit32((U32)offset+1) + 1); + if ((mlRep >= 4) && (gain2 > gain1)) + matchLength = mlRep, offset = 0, start = ip; + } + if (isDxS) { + const U32 repIndex = (U32)(ip - base) - offset_1; + const BYTE* repMatch = repIndex < prefixLowestIndex ? + dictBase + (repIndex - dictIndexDelta) : + base + repIndex; + if (((U32)((prefixLowestIndex-1) - repIndex) >= 3 /* intentional underflow */) + && (MEM_read32(repMatch) == MEM_read32(ip)) ) { + const BYTE* repMatchEnd = repIndex < prefixLowestIndex ? dictEnd : iend; + size_t const mlRep = ZSTD_count_2segments(ip+4, repMatch+4, iend, repMatchEnd, prefixLowest) + 4; + int const gain2 = (int)(mlRep * 4); + int const gain1 = (int)(matchLength*4 - ZSTD_highbit32((U32)offset+1) + 1); + if ((mlRep >= 4) && (gain2 > gain1)) + matchLength = mlRep, offset = 0, start = ip; + } + } + { size_t offset2=999999999; + size_t const ml2 = searchMax(ms, ip, iend, &offset2); + int const gain2 = (int)(ml2*4 - ZSTD_highbit32((U32)offset2+1)); /* raw approx */ + int const gain1 = (int)(matchLength*4 - ZSTD_highbit32((U32)offset+1) + 7); + if ((ml2 >= 4) && (gain2 > gain1)) { + matchLength = ml2, offset = offset2, start = ip; + continue; + } } } + break; /* nothing found : store previous solution */ + } + + /* NOTE: + * start[-offset+ZSTD_REP_MOVE-1] is undefined behavior. + * (-offset+ZSTD_REP_MOVE-1) is unsigned, and is added to start, which + * overflows the pointer, which is undefined behavior. + */ + /* catch up */ + if (offset) { + if (dictMode == ZSTD_noDict) { + while ( ((start > anchor) & (start - (offset-ZSTD_REP_MOVE) > prefixLowest)) + && (start[-1] == (start-(offset-ZSTD_REP_MOVE))[-1]) ) /* only search for offset within prefix */ + { start--; matchLength++; } + } + if (isDxS) { + U32 const matchIndex = (U32)((start-base) - (offset - ZSTD_REP_MOVE)); + const BYTE* match = (matchIndex < prefixLowestIndex) ? dictBase + matchIndex - dictIndexDelta : base + matchIndex; + const BYTE* const mStart = (matchIndex < prefixLowestIndex) ? dictLowest : prefixLowest; + while ((start>anchor) && (match>mStart) && (start[-1] == match[-1])) { start--; match--; matchLength++; } /* catch up */ + } + offset_2 = offset_1; offset_1 = (U32)(offset - ZSTD_REP_MOVE); + } + /* store sequence */ +_storeSequence: + { size_t const litLength = start - anchor; + ZSTD_storeSeq(seqStore, litLength, anchor, iend, (U32)offset, matchLength-MINMATCH); + anchor = ip = start + matchLength; + } + + /* check immediate repcode */ + if (isDxS) { + while (ip <= ilimit) { + U32 const current2 = (U32)(ip-base); + U32 const repIndex = current2 - offset_2; + const BYTE* repMatch = repIndex < prefixLowestIndex ? + dictBase - dictIndexDelta + repIndex : + base + repIndex; + if ( ((U32)((prefixLowestIndex-1) - (U32)repIndex) >= 3 /* intentional overflow */) + && (MEM_read32(repMatch) == MEM_read32(ip)) ) { + const BYTE* const repEnd2 = repIndex < prefixLowestIndex ? dictEnd : iend; + matchLength = ZSTD_count_2segments(ip+4, repMatch+4, iend, repEnd2, prefixLowest) + 4; + offset = offset_2; offset_2 = offset_1; offset_1 = (U32)offset; /* swap offset_2 <=> offset_1 */ + ZSTD_storeSeq(seqStore, 0, anchor, iend, 0, matchLength-MINMATCH); + ip += matchLength; + anchor = ip; + continue; + } + break; + } + } + + if (dictMode == ZSTD_noDict) { + while ( ((ip <= ilimit) & (offset_2>0)) + && (MEM_read32(ip) == MEM_read32(ip - offset_2)) ) { + /* store sequence */ + matchLength = ZSTD_count(ip+4, ip+4-offset_2, iend) + 4; + offset = offset_2; offset_2 = offset_1; offset_1 = (U32)offset; /* swap repcodes */ + ZSTD_storeSeq(seqStore, 0, anchor, iend, 0, matchLength-MINMATCH); + ip += matchLength; + anchor = ip; + continue; /* faster when present ... (?) */ + } } } + + /* Save reps for next block */ + rep[0] = offset_1 ? offset_1 : savedOffset; + rep[1] = offset_2 ? offset_2 : savedOffset; + + /* Return the last literals size */ + return (size_t)(iend - anchor); +} + + +size_t ZSTD_compressBlock_btlazy2( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize) +{ + return ZSTD_compressBlock_lazy_generic(ms, seqStore, rep, src, srcSize, search_binaryTree, 2, ZSTD_noDict); +} + +size_t ZSTD_compressBlock_lazy2( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize) +{ + return ZSTD_compressBlock_lazy_generic(ms, seqStore, rep, src, srcSize, search_hashChain, 2, ZSTD_noDict); +} + +size_t ZSTD_compressBlock_lazy( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize) +{ + return ZSTD_compressBlock_lazy_generic(ms, seqStore, rep, src, srcSize, search_hashChain, 1, ZSTD_noDict); +} + +size_t ZSTD_compressBlock_greedy( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize) +{ + return ZSTD_compressBlock_lazy_generic(ms, seqStore, rep, src, srcSize, search_hashChain, 0, ZSTD_noDict); +} + +size_t ZSTD_compressBlock_btlazy2_dictMatchState( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize) +{ + return ZSTD_compressBlock_lazy_generic(ms, seqStore, rep, src, srcSize, search_binaryTree, 2, ZSTD_dictMatchState); +} + +size_t ZSTD_compressBlock_lazy2_dictMatchState( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize) +{ + return ZSTD_compressBlock_lazy_generic(ms, seqStore, rep, src, srcSize, search_hashChain, 2, ZSTD_dictMatchState); +} + +size_t ZSTD_compressBlock_lazy_dictMatchState( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize) +{ + return ZSTD_compressBlock_lazy_generic(ms, seqStore, rep, src, srcSize, search_hashChain, 1, ZSTD_dictMatchState); +} + +size_t ZSTD_compressBlock_greedy_dictMatchState( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize) +{ + return ZSTD_compressBlock_lazy_generic(ms, seqStore, rep, src, srcSize, search_hashChain, 0, ZSTD_dictMatchState); +} + + +size_t ZSTD_compressBlock_lazy2_dedicatedDictSearch( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize) +{ + return ZSTD_compressBlock_lazy_generic(ms, seqStore, rep, src, srcSize, search_hashChain, 2, ZSTD_dedicatedDictSearch); +} + +size_t ZSTD_compressBlock_lazy_dedicatedDictSearch( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize) +{ + return ZSTD_compressBlock_lazy_generic(ms, seqStore, rep, src, srcSize, search_hashChain, 1, ZSTD_dedicatedDictSearch); +} + +size_t ZSTD_compressBlock_greedy_dedicatedDictSearch( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize) +{ + return ZSTD_compressBlock_lazy_generic(ms, seqStore, rep, src, srcSize, search_hashChain, 0, ZSTD_dedicatedDictSearch); +} + +/* Row-based matchfinder */ +size_t ZSTD_compressBlock_lazy2_row( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize) +{ + return ZSTD_compressBlock_lazy_generic(ms, seqStore, rep, src, srcSize, search_rowHash, 2, ZSTD_noDict); +} + +size_t ZSTD_compressBlock_lazy_row( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize) +{ + return ZSTD_compressBlock_lazy_generic(ms, seqStore, rep, src, srcSize, search_rowHash, 1, ZSTD_noDict); +} + +size_t ZSTD_compressBlock_greedy_row( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize) +{ + return ZSTD_compressBlock_lazy_generic(ms, seqStore, rep, src, srcSize, search_rowHash, 0, ZSTD_noDict); +} + +size_t ZSTD_compressBlock_lazy2_dictMatchState_row( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize) +{ + return ZSTD_compressBlock_lazy_generic(ms, seqStore, rep, src, srcSize, search_rowHash, 2, ZSTD_dictMatchState); +} + +size_t ZSTD_compressBlock_lazy_dictMatchState_row( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize) +{ + return ZSTD_compressBlock_lazy_generic(ms, seqStore, rep, src, srcSize, search_rowHash, 1, ZSTD_dictMatchState); +} + +size_t ZSTD_compressBlock_greedy_dictMatchState_row( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize) +{ + return ZSTD_compressBlock_lazy_generic(ms, seqStore, rep, src, srcSize, search_rowHash, 0, ZSTD_dictMatchState); +} + + +size_t ZSTD_compressBlock_lazy2_dedicatedDictSearch_row( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize) +{ + return ZSTD_compressBlock_lazy_generic(ms, seqStore, rep, src, srcSize, search_rowHash, 2, ZSTD_dedicatedDictSearch); +} + +size_t ZSTD_compressBlock_lazy_dedicatedDictSearch_row( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize) +{ + return ZSTD_compressBlock_lazy_generic(ms, seqStore, rep, src, srcSize, search_rowHash, 1, ZSTD_dedicatedDictSearch); +} + +size_t ZSTD_compressBlock_greedy_dedicatedDictSearch_row( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize) +{ + return ZSTD_compressBlock_lazy_generic(ms, seqStore, rep, src, srcSize, search_rowHash, 0, ZSTD_dedicatedDictSearch); +} + +FORCE_INLINE_TEMPLATE +size_t ZSTD_compressBlock_lazy_extDict_generic( + ZSTD_matchState_t* ms, seqStore_t* seqStore, + U32 rep[ZSTD_REP_NUM], + const void* src, size_t srcSize, + const searchMethod_e searchMethod, const U32 depth) +{ + const BYTE* const istart = (const BYTE*)src; + const BYTE* ip = istart; + const BYTE* anchor = istart; + const BYTE* const iend = istart + srcSize; + const BYTE* const ilimit = searchMethod == search_rowHash ? iend - 8 - ZSTD_ROW_HASH_CACHE_SIZE : iend - 8; + const BYTE* const base = ms->window.base; + const U32 dictLimit = ms->window.dictLimit; + const BYTE* const prefixStart = base + dictLimit; + const BYTE* const dictBase = ms->window.dictBase; + const BYTE* const dictEnd = dictBase + dictLimit; + const BYTE* const dictStart = dictBase + ms->window.lowLimit; + const U32 windowLog = ms->cParams.windowLog; + const U32 rowLog = ms->cParams.searchLog < 5 ? 4 : 5; + + typedef size_t (*searchMax_f)( + ZSTD_matchState_t* ms, + const BYTE* ip, const BYTE* iLimit, size_t* offsetPtr); + const searchMax_f searchFuncs[3] = { + ZSTD_HcFindBestMatch_extDict_selectMLS, + ZSTD_BtFindBestMatch_extDict_selectMLS, + ZSTD_RowFindBestMatch_extDict_selectRowLog + }; + searchMax_f searchMax = searchFuncs[(int)searchMethod]; + U32 offset_1 = rep[0], offset_2 = rep[1]; + + DEBUGLOG(5, "ZSTD_compressBlock_lazy_extDict_generic (searchFunc=%u)", (U32)searchMethod); + + /* init */ + ip += (ip == prefixStart); + if (searchMethod == search_rowHash) { + ZSTD_row_fillHashCache(ms, base, rowLog, + MIN(ms->cParams.minMatch, 6 /* mls caps out at 6 */), + ms->nextToUpdate, ilimit); + } + + /* Match Loop */ +#if defined(__GNUC__) && defined(__x86_64__) + /* I've measured random a 5% speed loss on levels 5 & 6 (greedy) when the + * code alignment is perturbed. To fix the instability align the loop on 32-bytes. + */ + __asm__(".p2align 5"); +#endif + while (ip < ilimit) { + size_t matchLength=0; + size_t offset=0; + const BYTE* start=ip+1; + U32 curr = (U32)(ip-base); + + /* check repCode */ + { const U32 windowLow = ZSTD_getLowestMatchIndex(ms, curr+1, windowLog); + const U32 repIndex = (U32)(curr+1 - offset_1); + const BYTE* const repBase = repIndex < dictLimit ? dictBase : base; + const BYTE* const repMatch = repBase + repIndex; + if ( ((U32)((dictLimit-1) - repIndex) >= 3) /* intentional overflow */ + & (offset_1 < curr+1 - windowLow) ) /* note: we are searching at curr+1 */ + if (MEM_read32(ip+1) == MEM_read32(repMatch)) { + /* repcode detected we should take it */ + const BYTE* const repEnd = repIndex < dictLimit ? dictEnd : iend; + matchLength = ZSTD_count_2segments(ip+1+4, repMatch+4, iend, repEnd, prefixStart) + 4; + if (depth==0) goto _storeSequence; + } } + + /* first search (depth 0) */ + { size_t offsetFound = 999999999; + size_t const ml2 = searchMax(ms, ip, iend, &offsetFound); + if (ml2 > matchLength) + matchLength = ml2, start = ip, offset=offsetFound; + } + + if (matchLength < 4) { + ip += ((ip-anchor) >> kSearchStrength) + 1; /* jump faster over incompressible sections */ + continue; + } + + /* let's try to find a better solution */ + if (depth>=1) + while (ip= 3) /* intentional overflow : do not test positions overlapping 2 memory segments */ + & (offset_1 < curr - windowLow) ) /* equivalent to `curr > repIndex >= windowLow` */ + if (MEM_read32(ip) == MEM_read32(repMatch)) { + /* repcode detected */ + const BYTE* const repEnd = repIndex < dictLimit ? dictEnd : iend; + size_t const repLength = ZSTD_count_2segments(ip+4, repMatch+4, iend, repEnd, prefixStart) + 4; + int const gain2 = (int)(repLength * 3); + int const gain1 = (int)(matchLength*3 - ZSTD_highbit32((U32)offset+1) + 1); + if ((repLength >= 4) && (gain2 > gain1)) + matchLength = repLength, offset = 0, start = ip; + } } + + /* search match, depth 1 */ + { size_t offset2=999999999; + size_t const ml2 = searchMax(ms, ip, iend, &offset2); + int const gain2 = (int)(ml2*4 - ZSTD_highbit32((U32)offset2+1)); /* raw approx */ + int const gain1 = (int)(matchLength*4 - ZSTD_highbit32((U32)offset+1) + 4); + if ((ml2 >= 4) && (gain2 > gain1)) { + matchLength = ml2, offset = offset2, start = ip; + continue; /* search a better one */ + } } + + /* let's find an even better one */ + if ((depth==2) && (ip= 3) /* intentional overflow : do not test positions overlapping 2 memory segments */ + & (offset_1 < curr - windowLow) ) /* equivalent to `curr > repIndex >= windowLow` */ + if (MEM_read32(ip) == MEM_read32(repMatch)) { + /* repcode detected */ + const BYTE* const repEnd = repIndex < dictLimit ? dictEnd : iend; + size_t const repLength = ZSTD_count_2segments(ip+4, repMatch+4, iend, repEnd, prefixStart) + 4; + int const gain2 = (int)(repLength * 4); + int const gain1 = (int)(matchLength*4 - ZSTD_highbit32((U32)offset+1) + 1); + if ((repLength >= 4) && (gain2 > gain1)) + matchLength = repLength, offset = 0, start = ip; + } } + + /* search match, depth 2 */ + { size_t offset2=999999999; + size_t const ml2 = searchMax(ms, ip, iend, &offset2); + int const gain2 = (int)(ml2*4 - ZSTD_highbit32((U32)offset2+1)); /* raw approx */ + int const gain1 = (int)(matchLength*4 - ZSTD_highbit32((U32)offset+1) + 7); + if ((ml2 >= 4) && (gain2 > gain1)) { + matchLength = ml2, offset = offset2, start = ip; + continue; + } } } + break; /* nothing found : store previous solution */ + } + + /* catch up */ + if (offset) { + U32 const matchIndex = (U32)((start-base) - (offset - ZSTD_REP_MOVE)); + const BYTE* match = (matchIndex < dictLimit) ? dictBase + matchIndex : base + matchIndex; + const BYTE* const mStart = (matchIndex < dictLimit) ? dictStart : prefixStart; + while ((start>anchor) && (match>mStart) && (start[-1] == match[-1])) { start--; match--; matchLength++; } /* catch up */ + offset_2 = offset_1; offset_1 = (U32)(offset - ZSTD_REP_MOVE); + } + + /* store sequence */ +_storeSequence: + { size_t const litLength = start - anchor; + ZSTD_storeSeq(seqStore, litLength, anchor, iend, (U32)offset, matchLength-MINMATCH); + anchor = ip = start + matchLength; + } + + /* check immediate repcode */ + while (ip <= ilimit) { + const U32 repCurrent = (U32)(ip-base); + const U32 windowLow = ZSTD_getLowestMatchIndex(ms, repCurrent, windowLog); + const U32 repIndex = repCurrent - offset_2; + const BYTE* const repBase = repIndex < dictLimit ? dictBase : base; + const BYTE* const repMatch = repBase + repIndex; + if ( ((U32)((dictLimit-1) - repIndex) >= 3) /* intentional overflow : do not test positions overlapping 2 memory segments */ + & (offset_2 < repCurrent - windowLow) ) /* equivalent to `curr > repIndex >= windowLow` */ + if (MEM_read32(ip) == MEM_read32(repMatch)) { + /* repcode detected we should take it */ + const BYTE* const repEnd = repIndex < dictLimit ? dictEnd : iend; + matchLength = ZSTD_count_2segments(ip+4, repMatch+4, iend, repEnd, prefixStart) + 4; + offset = offset_2; offset_2 = offset_1; offset_1 = (U32)offset; /* swap offset history */ + ZSTD_storeSeq(seqStore, 0, anchor, iend, 0, matchLength-MINMATCH); + ip += matchLength; + anchor = ip; + continue; /* faster when present ... (?) */ + } + break; + } } + + /* Save reps for next block */ + rep[0] = offset_1; + rep[1] = offset_2; + + /* Return the last literals size */ + return (size_t)(iend - anchor); +} + + +size_t ZSTD_compressBlock_greedy_extDict( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize) +{ + return ZSTD_compressBlock_lazy_extDict_generic(ms, seqStore, rep, src, srcSize, search_hashChain, 0); +} + +size_t ZSTD_compressBlock_lazy_extDict( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize) + +{ + return ZSTD_compressBlock_lazy_extDict_generic(ms, seqStore, rep, src, srcSize, search_hashChain, 1); +} + +size_t ZSTD_compressBlock_lazy2_extDict( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize) + +{ + return ZSTD_compressBlock_lazy_extDict_generic(ms, seqStore, rep, src, srcSize, search_hashChain, 2); +} + +size_t ZSTD_compressBlock_btlazy2_extDict( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize) + +{ + return ZSTD_compressBlock_lazy_extDict_generic(ms, seqStore, rep, src, srcSize, search_binaryTree, 2); +} + +size_t ZSTD_compressBlock_greedy_extDict_row( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize) +{ + return ZSTD_compressBlock_lazy_extDict_generic(ms, seqStore, rep, src, srcSize, search_rowHash, 0); +} + +size_t ZSTD_compressBlock_lazy_extDict_row( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize) + +{ + return ZSTD_compressBlock_lazy_extDict_generic(ms, seqStore, rep, src, srcSize, search_rowHash, 1); +} + +size_t ZSTD_compressBlock_lazy2_extDict_row( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize) + +{ + return ZSTD_compressBlock_lazy_extDict_generic(ms, seqStore, rep, src, srcSize, search_rowHash, 2); +} diff --git a/external/zstd/lib/compress/zstd_lazy.h b/external/zstd/lib/compress/zstd_lazy.h new file mode 100644 index 00000000..150f7b39 --- /dev/null +++ b/external/zstd/lib/compress/zstd_lazy.h @@ -0,0 +1,125 @@ +/* + * Copyright (c) Yann Collet, Facebook, Inc. + * All rights reserved. + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. + */ + +#ifndef ZSTD_LAZY_H +#define ZSTD_LAZY_H + +#if defined (__cplusplus) +extern "C" { +#endif + +#include "zstd_compress_internal.h" + +/** + * Dedicated Dictionary Search Structure bucket log. In the + * ZSTD_dedicatedDictSearch mode, the hashTable has + * 2 ** ZSTD_LAZY_DDSS_BUCKET_LOG entries in each bucket, rather than just + * one. + */ +#define ZSTD_LAZY_DDSS_BUCKET_LOG 2 + +U32 ZSTD_insertAndFindFirstIndex(ZSTD_matchState_t* ms, const BYTE* ip); +void ZSTD_row_update(ZSTD_matchState_t* const ms, const BYTE* ip); + +void ZSTD_dedicatedDictSearch_lazy_loadDictionary(ZSTD_matchState_t* ms, const BYTE* const ip); + +void ZSTD_preserveUnsortedMark (U32* const table, U32 const size, U32 const reducerValue); /*! used in ZSTD_reduceIndex(). preemptively increase value of ZSTD_DUBT_UNSORTED_MARK */ + +size_t ZSTD_compressBlock_btlazy2( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize); +size_t ZSTD_compressBlock_lazy2( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize); +size_t ZSTD_compressBlock_lazy( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize); +size_t ZSTD_compressBlock_greedy( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize); +size_t ZSTD_compressBlock_lazy2_row( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize); +size_t ZSTD_compressBlock_lazy_row( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize); +size_t ZSTD_compressBlock_greedy_row( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize); + +size_t ZSTD_compressBlock_btlazy2_dictMatchState( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize); +size_t ZSTD_compressBlock_lazy2_dictMatchState( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize); +size_t ZSTD_compressBlock_lazy_dictMatchState( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize); +size_t ZSTD_compressBlock_greedy_dictMatchState( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize); +size_t ZSTD_compressBlock_lazy2_dictMatchState_row( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize); +size_t ZSTD_compressBlock_lazy_dictMatchState_row( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize); +size_t ZSTD_compressBlock_greedy_dictMatchState_row( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize); + +size_t ZSTD_compressBlock_lazy2_dedicatedDictSearch( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize); +size_t ZSTD_compressBlock_lazy_dedicatedDictSearch( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize); +size_t ZSTD_compressBlock_greedy_dedicatedDictSearch( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize); +size_t ZSTD_compressBlock_lazy2_dedicatedDictSearch_row( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize); +size_t ZSTD_compressBlock_lazy_dedicatedDictSearch_row( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize); +size_t ZSTD_compressBlock_greedy_dedicatedDictSearch_row( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize); + +size_t ZSTD_compressBlock_greedy_extDict( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize); +size_t ZSTD_compressBlock_lazy_extDict( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize); +size_t ZSTD_compressBlock_lazy2_extDict( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize); +size_t ZSTD_compressBlock_greedy_extDict_row( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize); +size_t ZSTD_compressBlock_lazy_extDict_row( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize); +size_t ZSTD_compressBlock_lazy2_extDict_row( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize); +size_t ZSTD_compressBlock_btlazy2_extDict( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize); + + +#if defined (__cplusplus) +} +#endif + +#endif /* ZSTD_LAZY_H */ diff --git a/external/zstd/lib/compress/zstd_ldm.c b/external/zstd/lib/compress/zstd_ldm.c new file mode 100644 index 00000000..fa4ebeab --- /dev/null +++ b/external/zstd/lib/compress/zstd_ldm.c @@ -0,0 +1,722 @@ +/* + * Copyright (c) Yann Collet, Facebook, Inc. + * All rights reserved. + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. + */ + +#include "zstd_ldm.h" + +#include "../common/debug.h" +#include "../common/xxhash.h" +#include "zstd_fast.h" /* ZSTD_fillHashTable() */ +#include "zstd_double_fast.h" /* ZSTD_fillDoubleHashTable() */ +#include "zstd_ldm_geartab.h" + +#define LDM_BUCKET_SIZE_LOG 3 +#define LDM_MIN_MATCH_LENGTH 64 +#define LDM_HASH_RLOG 7 + +typedef struct { + U64 rolling; + U64 stopMask; +} ldmRollingHashState_t; + +/** ZSTD_ldm_gear_init(): + * + * Initializes the rolling hash state such that it will honor the + * settings in params. */ +static void ZSTD_ldm_gear_init(ldmRollingHashState_t* state, ldmParams_t const* params) +{ + unsigned maxBitsInMask = MIN(params->minMatchLength, 64); + unsigned hashRateLog = params->hashRateLog; + + state->rolling = ~(U32)0; + + /* The choice of the splitting criterion is subject to two conditions: + * 1. it has to trigger on average every 2^(hashRateLog) bytes; + * 2. ideally, it has to depend on a window of minMatchLength bytes. + * + * In the gear hash algorithm, bit n depends on the last n bytes; + * so in order to obtain a good quality splitting criterion it is + * preferable to use bits with high weight. + * + * To match condition 1 we use a mask with hashRateLog bits set + * and, because of the previous remark, we make sure these bits + * have the highest possible weight while still respecting + * condition 2. + */ + if (hashRateLog > 0 && hashRateLog <= maxBitsInMask) { + state->stopMask = (((U64)1 << hashRateLog) - 1) << (maxBitsInMask - hashRateLog); + } else { + /* In this degenerate case we simply honor the hash rate. */ + state->stopMask = ((U64)1 << hashRateLog) - 1; + } +} + +/** ZSTD_ldm_gear_reset() + * Feeds [data, data + minMatchLength) into the hash without registering any + * splits. This effectively resets the hash state. This is used when skipping + * over data, either at the beginning of a block, or skipping sections. + */ +static void ZSTD_ldm_gear_reset(ldmRollingHashState_t* state, + BYTE const* data, size_t minMatchLength) +{ + U64 hash = state->rolling; + size_t n = 0; + +#define GEAR_ITER_ONCE() do { \ + hash = (hash << 1) + ZSTD_ldm_gearTab[data[n] & 0xff]; \ + n += 1; \ + } while (0) + while (n + 3 < minMatchLength) { + GEAR_ITER_ONCE(); + GEAR_ITER_ONCE(); + GEAR_ITER_ONCE(); + GEAR_ITER_ONCE(); + } + while (n < minMatchLength) { + GEAR_ITER_ONCE(); + } +#undef GEAR_ITER_ONCE +} + +/** ZSTD_ldm_gear_feed(): + * + * Registers in the splits array all the split points found in the first + * size bytes following the data pointer. This function terminates when + * either all the data has been processed or LDM_BATCH_SIZE splits are + * present in the splits array. + * + * Precondition: The splits array must not be full. + * Returns: The number of bytes processed. */ +static size_t ZSTD_ldm_gear_feed(ldmRollingHashState_t* state, + BYTE const* data, size_t size, + size_t* splits, unsigned* numSplits) +{ + size_t n; + U64 hash, mask; + + hash = state->rolling; + mask = state->stopMask; + n = 0; + +#define GEAR_ITER_ONCE() do { \ + hash = (hash << 1) + ZSTD_ldm_gearTab[data[n] & 0xff]; \ + n += 1; \ + if (UNLIKELY((hash & mask) == 0)) { \ + splits[*numSplits] = n; \ + *numSplits += 1; \ + if (*numSplits == LDM_BATCH_SIZE) \ + goto done; \ + } \ + } while (0) + + while (n + 3 < size) { + GEAR_ITER_ONCE(); + GEAR_ITER_ONCE(); + GEAR_ITER_ONCE(); + GEAR_ITER_ONCE(); + } + while (n < size) { + GEAR_ITER_ONCE(); + } + +#undef GEAR_ITER_ONCE + +done: + state->rolling = hash; + return n; +} + +void ZSTD_ldm_adjustParameters(ldmParams_t* params, + ZSTD_compressionParameters const* cParams) +{ + params->windowLog = cParams->windowLog; + ZSTD_STATIC_ASSERT(LDM_BUCKET_SIZE_LOG <= ZSTD_LDM_BUCKETSIZELOG_MAX); + DEBUGLOG(4, "ZSTD_ldm_adjustParameters"); + if (!params->bucketSizeLog) params->bucketSizeLog = LDM_BUCKET_SIZE_LOG; + if (!params->minMatchLength) params->minMatchLength = LDM_MIN_MATCH_LENGTH; + if (params->hashLog == 0) { + params->hashLog = MAX(ZSTD_HASHLOG_MIN, params->windowLog - LDM_HASH_RLOG); + assert(params->hashLog <= ZSTD_HASHLOG_MAX); + } + if (params->hashRateLog == 0) { + params->hashRateLog = params->windowLog < params->hashLog + ? 0 + : params->windowLog - params->hashLog; + } + params->bucketSizeLog = MIN(params->bucketSizeLog, params->hashLog); +} + +size_t ZSTD_ldm_getTableSize(ldmParams_t params) +{ + size_t const ldmHSize = ((size_t)1) << params.hashLog; + size_t const ldmBucketSizeLog = MIN(params.bucketSizeLog, params.hashLog); + size_t const ldmBucketSize = ((size_t)1) << (params.hashLog - ldmBucketSizeLog); + size_t const totalSize = ZSTD_cwksp_alloc_size(ldmBucketSize) + + ZSTD_cwksp_alloc_size(ldmHSize * sizeof(ldmEntry_t)); + return params.enableLdm ? totalSize : 0; +} + +size_t ZSTD_ldm_getMaxNbSeq(ldmParams_t params, size_t maxChunkSize) +{ + return params.enableLdm ? (maxChunkSize / params.minMatchLength) : 0; +} + +/** ZSTD_ldm_getBucket() : + * Returns a pointer to the start of the bucket associated with hash. */ +static ldmEntry_t* ZSTD_ldm_getBucket( + ldmState_t* ldmState, size_t hash, ldmParams_t const ldmParams) +{ + return ldmState->hashTable + (hash << ldmParams.bucketSizeLog); +} + +/** ZSTD_ldm_insertEntry() : + * Insert the entry with corresponding hash into the hash table */ +static void ZSTD_ldm_insertEntry(ldmState_t* ldmState, + size_t const hash, const ldmEntry_t entry, + ldmParams_t const ldmParams) +{ + BYTE* const pOffset = ldmState->bucketOffsets + hash; + unsigned const offset = *pOffset; + + *(ZSTD_ldm_getBucket(ldmState, hash, ldmParams) + offset) = entry; + *pOffset = (BYTE)((offset + 1) & ((1u << ldmParams.bucketSizeLog) - 1)); + +} + +/** ZSTD_ldm_countBackwardsMatch() : + * Returns the number of bytes that match backwards before pIn and pMatch. + * + * We count only bytes where pMatch >= pBase and pIn >= pAnchor. */ +static size_t ZSTD_ldm_countBackwardsMatch( + const BYTE* pIn, const BYTE* pAnchor, + const BYTE* pMatch, const BYTE* pMatchBase) +{ + size_t matchLength = 0; + while (pIn > pAnchor && pMatch > pMatchBase && pIn[-1] == pMatch[-1]) { + pIn--; + pMatch--; + matchLength++; + } + return matchLength; +} + +/** ZSTD_ldm_countBackwardsMatch_2segments() : + * Returns the number of bytes that match backwards from pMatch, + * even with the backwards match spanning 2 different segments. + * + * On reaching `pMatchBase`, start counting from mEnd */ +static size_t ZSTD_ldm_countBackwardsMatch_2segments( + const BYTE* pIn, const BYTE* pAnchor, + const BYTE* pMatch, const BYTE* pMatchBase, + const BYTE* pExtDictStart, const BYTE* pExtDictEnd) +{ + size_t matchLength = ZSTD_ldm_countBackwardsMatch(pIn, pAnchor, pMatch, pMatchBase); + if (pMatch - matchLength != pMatchBase || pMatchBase == pExtDictStart) { + /* If backwards match is entirely in the extDict or prefix, immediately return */ + return matchLength; + } + DEBUGLOG(7, "ZSTD_ldm_countBackwardsMatch_2segments: found 2-parts backwards match (length in prefix==%zu)", matchLength); + matchLength += ZSTD_ldm_countBackwardsMatch(pIn - matchLength, pAnchor, pExtDictEnd, pExtDictStart); + DEBUGLOG(7, "final backwards match length = %zu", matchLength); + return matchLength; +} + +/** ZSTD_ldm_fillFastTables() : + * + * Fills the relevant tables for the ZSTD_fast and ZSTD_dfast strategies. + * This is similar to ZSTD_loadDictionaryContent. + * + * The tables for the other strategies are filled within their + * block compressors. */ +static size_t ZSTD_ldm_fillFastTables(ZSTD_matchState_t* ms, + void const* end) +{ + const BYTE* const iend = (const BYTE*)end; + + switch(ms->cParams.strategy) + { + case ZSTD_fast: + ZSTD_fillHashTable(ms, iend, ZSTD_dtlm_fast); + break; + + case ZSTD_dfast: + ZSTD_fillDoubleHashTable(ms, iend, ZSTD_dtlm_fast); + break; + + case ZSTD_greedy: + case ZSTD_lazy: + case ZSTD_lazy2: + case ZSTD_btlazy2: + case ZSTD_btopt: + case ZSTD_btultra: + case ZSTD_btultra2: + break; + default: + assert(0); /* not possible : not a valid strategy id */ + } + + return 0; +} + +void ZSTD_ldm_fillHashTable( + ldmState_t* ldmState, const BYTE* ip, + const BYTE* iend, ldmParams_t const* params) +{ + U32 const minMatchLength = params->minMatchLength; + U32 const hBits = params->hashLog - params->bucketSizeLog; + BYTE const* const base = ldmState->window.base; + BYTE const* const istart = ip; + ldmRollingHashState_t hashState; + size_t* const splits = ldmState->splitIndices; + unsigned numSplits; + + DEBUGLOG(5, "ZSTD_ldm_fillHashTable"); + + ZSTD_ldm_gear_init(&hashState, params); + while (ip < iend) { + size_t hashed; + unsigned n; + + numSplits = 0; + hashed = ZSTD_ldm_gear_feed(&hashState, ip, iend - ip, splits, &numSplits); + + for (n = 0; n < numSplits; n++) { + if (ip + splits[n] >= istart + minMatchLength) { + BYTE const* const split = ip + splits[n] - minMatchLength; + U64 const xxhash = XXH64(split, minMatchLength, 0); + U32 const hash = (U32)(xxhash & (((U32)1 << hBits) - 1)); + ldmEntry_t entry; + + entry.offset = (U32)(split - base); + entry.checksum = (U32)(xxhash >> 32); + ZSTD_ldm_insertEntry(ldmState, hash, entry, *params); + } + } + + ip += hashed; + } +} + + +/** ZSTD_ldm_limitTableUpdate() : + * + * Sets cctx->nextToUpdate to a position corresponding closer to anchor + * if it is far way + * (after a long match, only update tables a limited amount). */ +static void ZSTD_ldm_limitTableUpdate(ZSTD_matchState_t* ms, const BYTE* anchor) +{ + U32 const curr = (U32)(anchor - ms->window.base); + if (curr > ms->nextToUpdate + 1024) { + ms->nextToUpdate = + curr - MIN(512, curr - ms->nextToUpdate - 1024); + } +} + +static size_t ZSTD_ldm_generateSequences_internal( + ldmState_t* ldmState, rawSeqStore_t* rawSeqStore, + ldmParams_t const* params, void const* src, size_t srcSize) +{ + /* LDM parameters */ + int const extDict = ZSTD_window_hasExtDict(ldmState->window); + U32 const minMatchLength = params->minMatchLength; + U32 const entsPerBucket = 1U << params->bucketSizeLog; + U32 const hBits = params->hashLog - params->bucketSizeLog; + /* Prefix and extDict parameters */ + U32 const dictLimit = ldmState->window.dictLimit; + U32 const lowestIndex = extDict ? ldmState->window.lowLimit : dictLimit; + BYTE const* const base = ldmState->window.base; + BYTE const* const dictBase = extDict ? ldmState->window.dictBase : NULL; + BYTE const* const dictStart = extDict ? dictBase + lowestIndex : NULL; + BYTE const* const dictEnd = extDict ? dictBase + dictLimit : NULL; + BYTE const* const lowPrefixPtr = base + dictLimit; + /* Input bounds */ + BYTE const* const istart = (BYTE const*)src; + BYTE const* const iend = istart + srcSize; + BYTE const* const ilimit = iend - HASH_READ_SIZE; + /* Input positions */ + BYTE const* anchor = istart; + BYTE const* ip = istart; + /* Rolling hash state */ + ldmRollingHashState_t hashState; + /* Arrays for staged-processing */ + size_t* const splits = ldmState->splitIndices; + ldmMatchCandidate_t* const candidates = ldmState->matchCandidates; + unsigned numSplits; + + if (srcSize < minMatchLength) + return iend - anchor; + + /* Initialize the rolling hash state with the first minMatchLength bytes */ + ZSTD_ldm_gear_init(&hashState, params); + ZSTD_ldm_gear_reset(&hashState, ip, minMatchLength); + ip += minMatchLength; + + while (ip < ilimit) { + size_t hashed; + unsigned n; + + numSplits = 0; + hashed = ZSTD_ldm_gear_feed(&hashState, ip, ilimit - ip, + splits, &numSplits); + + for (n = 0; n < numSplits; n++) { + BYTE const* const split = ip + splits[n] - minMatchLength; + U64 const xxhash = XXH64(split, minMatchLength, 0); + U32 const hash = (U32)(xxhash & (((U32)1 << hBits) - 1)); + + candidates[n].split = split; + candidates[n].hash = hash; + candidates[n].checksum = (U32)(xxhash >> 32); + candidates[n].bucket = ZSTD_ldm_getBucket(ldmState, hash, *params); + PREFETCH_L1(candidates[n].bucket); + } + + for (n = 0; n < numSplits; n++) { + size_t forwardMatchLength = 0, backwardMatchLength = 0, + bestMatchLength = 0, mLength; + U32 offset; + BYTE const* const split = candidates[n].split; + U32 const checksum = candidates[n].checksum; + U32 const hash = candidates[n].hash; + ldmEntry_t* const bucket = candidates[n].bucket; + ldmEntry_t const* cur; + ldmEntry_t const* bestEntry = NULL; + ldmEntry_t newEntry; + + newEntry.offset = (U32)(split - base); + newEntry.checksum = checksum; + + /* If a split point would generate a sequence overlapping with + * the previous one, we merely register it in the hash table and + * move on */ + if (split < anchor) { + ZSTD_ldm_insertEntry(ldmState, hash, newEntry, *params); + continue; + } + + for (cur = bucket; cur < bucket + entsPerBucket; cur++) { + size_t curForwardMatchLength, curBackwardMatchLength, + curTotalMatchLength; + if (cur->checksum != checksum || cur->offset <= lowestIndex) { + continue; + } + if (extDict) { + BYTE const* const curMatchBase = + cur->offset < dictLimit ? dictBase : base; + BYTE const* const pMatch = curMatchBase + cur->offset; + BYTE const* const matchEnd = + cur->offset < dictLimit ? dictEnd : iend; + BYTE const* const lowMatchPtr = + cur->offset < dictLimit ? dictStart : lowPrefixPtr; + curForwardMatchLength = + ZSTD_count_2segments(split, pMatch, iend, matchEnd, lowPrefixPtr); + if (curForwardMatchLength < minMatchLength) { + continue; + } + curBackwardMatchLength = ZSTD_ldm_countBackwardsMatch_2segments( + split, anchor, pMatch, lowMatchPtr, dictStart, dictEnd); + } else { /* !extDict */ + BYTE const* const pMatch = base + cur->offset; + curForwardMatchLength = ZSTD_count(split, pMatch, iend); + if (curForwardMatchLength < minMatchLength) { + continue; + } + curBackwardMatchLength = + ZSTD_ldm_countBackwardsMatch(split, anchor, pMatch, lowPrefixPtr); + } + curTotalMatchLength = curForwardMatchLength + curBackwardMatchLength; + + if (curTotalMatchLength > bestMatchLength) { + bestMatchLength = curTotalMatchLength; + forwardMatchLength = curForwardMatchLength; + backwardMatchLength = curBackwardMatchLength; + bestEntry = cur; + } + } + + /* No match found -- insert an entry into the hash table + * and process the next candidate match */ + if (bestEntry == NULL) { + ZSTD_ldm_insertEntry(ldmState, hash, newEntry, *params); + continue; + } + + /* Match found */ + offset = (U32)(split - base) - bestEntry->offset; + mLength = forwardMatchLength + backwardMatchLength; + { + rawSeq* const seq = rawSeqStore->seq + rawSeqStore->size; + + /* Out of sequence storage */ + if (rawSeqStore->size == rawSeqStore->capacity) + return ERROR(dstSize_tooSmall); + seq->litLength = (U32)(split - backwardMatchLength - anchor); + seq->matchLength = (U32)mLength; + seq->offset = offset; + rawSeqStore->size++; + } + + /* Insert the current entry into the hash table --- it must be + * done after the previous block to avoid clobbering bestEntry */ + ZSTD_ldm_insertEntry(ldmState, hash, newEntry, *params); + + anchor = split + forwardMatchLength; + + /* If we find a match that ends after the data that we've hashed + * then we have a repeating, overlapping, pattern. E.g. all zeros. + * If one repetition of the pattern matches our `stopMask` then all + * repetitions will. We don't need to insert them all into out table, + * only the first one. So skip over overlapping matches. + * This is a major speed boost (20x) for compressing a single byte + * repeated, when that byte ends up in the table. + */ + if (anchor > ip + hashed) { + ZSTD_ldm_gear_reset(&hashState, anchor - minMatchLength, minMatchLength); + /* Continue the outter loop at anchor (ip + hashed == anchor). */ + ip = anchor - hashed; + break; + } + } + + ip += hashed; + } + + return iend - anchor; +} + +/*! ZSTD_ldm_reduceTable() : + * reduce table indexes by `reducerValue` */ +static void ZSTD_ldm_reduceTable(ldmEntry_t* const table, U32 const size, + U32 const reducerValue) +{ + U32 u; + for (u = 0; u < size; u++) { + if (table[u].offset < reducerValue) table[u].offset = 0; + else table[u].offset -= reducerValue; + } +} + +size_t ZSTD_ldm_generateSequences( + ldmState_t* ldmState, rawSeqStore_t* sequences, + ldmParams_t const* params, void const* src, size_t srcSize) +{ + U32 const maxDist = 1U << params->windowLog; + BYTE const* const istart = (BYTE const*)src; + BYTE const* const iend = istart + srcSize; + size_t const kMaxChunkSize = 1 << 20; + size_t const nbChunks = (srcSize / kMaxChunkSize) + ((srcSize % kMaxChunkSize) != 0); + size_t chunk; + size_t leftoverSize = 0; + + assert(ZSTD_CHUNKSIZE_MAX >= kMaxChunkSize); + /* Check that ZSTD_window_update() has been called for this chunk prior + * to passing it to this function. + */ + assert(ldmState->window.nextSrc >= (BYTE const*)src + srcSize); + /* The input could be very large (in zstdmt), so it must be broken up into + * chunks to enforce the maximum distance and handle overflow correction. + */ + assert(sequences->pos <= sequences->size); + assert(sequences->size <= sequences->capacity); + for (chunk = 0; chunk < nbChunks && sequences->size < sequences->capacity; ++chunk) { + BYTE const* const chunkStart = istart + chunk * kMaxChunkSize; + size_t const remaining = (size_t)(iend - chunkStart); + BYTE const *const chunkEnd = + (remaining < kMaxChunkSize) ? iend : chunkStart + kMaxChunkSize; + size_t const chunkSize = chunkEnd - chunkStart; + size_t newLeftoverSize; + size_t const prevSize = sequences->size; + + assert(chunkStart < iend); + /* 1. Perform overflow correction if necessary. */ + if (ZSTD_window_needOverflowCorrection(ldmState->window, 0, maxDist, ldmState->loadedDictEnd, chunkStart, chunkEnd)) { + U32 const ldmHSize = 1U << params->hashLog; + U32 const correction = ZSTD_window_correctOverflow( + &ldmState->window, /* cycleLog */ 0, maxDist, chunkStart); + ZSTD_ldm_reduceTable(ldmState->hashTable, ldmHSize, correction); + /* invalidate dictionaries on overflow correction */ + ldmState->loadedDictEnd = 0; + } + /* 2. We enforce the maximum offset allowed. + * + * kMaxChunkSize should be small enough that we don't lose too much of + * the window through early invalidation. + * TODO: * Test the chunk size. + * * Try invalidation after the sequence generation and test the + * the offset against maxDist directly. + * + * NOTE: Because of dictionaries + sequence splitting we MUST make sure + * that any offset used is valid at the END of the sequence, since it may + * be split into two sequences. This condition holds when using + * ZSTD_window_enforceMaxDist(), but if we move to checking offsets + * against maxDist directly, we'll have to carefully handle that case. + */ + ZSTD_window_enforceMaxDist(&ldmState->window, chunkEnd, maxDist, &ldmState->loadedDictEnd, NULL); + /* 3. Generate the sequences for the chunk, and get newLeftoverSize. */ + newLeftoverSize = ZSTD_ldm_generateSequences_internal( + ldmState, sequences, params, chunkStart, chunkSize); + if (ZSTD_isError(newLeftoverSize)) + return newLeftoverSize; + /* 4. We add the leftover literals from previous iterations to the first + * newly generated sequence, or add the `newLeftoverSize` if none are + * generated. + */ + /* Prepend the leftover literals from the last call */ + if (prevSize < sequences->size) { + sequences->seq[prevSize].litLength += (U32)leftoverSize; + leftoverSize = newLeftoverSize; + } else { + assert(newLeftoverSize == chunkSize); + leftoverSize += chunkSize; + } + } + return 0; +} + +void ZSTD_ldm_skipSequences(rawSeqStore_t* rawSeqStore, size_t srcSize, U32 const minMatch) { + while (srcSize > 0 && rawSeqStore->pos < rawSeqStore->size) { + rawSeq* seq = rawSeqStore->seq + rawSeqStore->pos; + if (srcSize <= seq->litLength) { + /* Skip past srcSize literals */ + seq->litLength -= (U32)srcSize; + return; + } + srcSize -= seq->litLength; + seq->litLength = 0; + if (srcSize < seq->matchLength) { + /* Skip past the first srcSize of the match */ + seq->matchLength -= (U32)srcSize; + if (seq->matchLength < minMatch) { + /* The match is too short, omit it */ + if (rawSeqStore->pos + 1 < rawSeqStore->size) { + seq[1].litLength += seq[0].matchLength; + } + rawSeqStore->pos++; + } + return; + } + srcSize -= seq->matchLength; + seq->matchLength = 0; + rawSeqStore->pos++; + } +} + +/** + * If the sequence length is longer than remaining then the sequence is split + * between this block and the next. + * + * Returns the current sequence to handle, or if the rest of the block should + * be literals, it returns a sequence with offset == 0. + */ +static rawSeq maybeSplitSequence(rawSeqStore_t* rawSeqStore, + U32 const remaining, U32 const minMatch) +{ + rawSeq sequence = rawSeqStore->seq[rawSeqStore->pos]; + assert(sequence.offset > 0); + /* Likely: No partial sequence */ + if (remaining >= sequence.litLength + sequence.matchLength) { + rawSeqStore->pos++; + return sequence; + } + /* Cut the sequence short (offset == 0 ==> rest is literals). */ + if (remaining <= sequence.litLength) { + sequence.offset = 0; + } else if (remaining < sequence.litLength + sequence.matchLength) { + sequence.matchLength = remaining - sequence.litLength; + if (sequence.matchLength < minMatch) { + sequence.offset = 0; + } + } + /* Skip past `remaining` bytes for the future sequences. */ + ZSTD_ldm_skipSequences(rawSeqStore, remaining, minMatch); + return sequence; +} + +void ZSTD_ldm_skipRawSeqStoreBytes(rawSeqStore_t* rawSeqStore, size_t nbBytes) { + U32 currPos = (U32)(rawSeqStore->posInSequence + nbBytes); + while (currPos && rawSeqStore->pos < rawSeqStore->size) { + rawSeq currSeq = rawSeqStore->seq[rawSeqStore->pos]; + if (currPos >= currSeq.litLength + currSeq.matchLength) { + currPos -= currSeq.litLength + currSeq.matchLength; + rawSeqStore->pos++; + } else { + rawSeqStore->posInSequence = currPos; + break; + } + } + if (currPos == 0 || rawSeqStore->pos == rawSeqStore->size) { + rawSeqStore->posInSequence = 0; + } +} + +size_t ZSTD_ldm_blockCompress(rawSeqStore_t* rawSeqStore, + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + ZSTD_useRowMatchFinderMode_e useRowMatchFinder, + void const* src, size_t srcSize) +{ + const ZSTD_compressionParameters* const cParams = &ms->cParams; + unsigned const minMatch = cParams->minMatch; + ZSTD_blockCompressor const blockCompressor = + ZSTD_selectBlockCompressor(cParams->strategy, useRowMatchFinder, ZSTD_matchState_dictMode(ms)); + /* Input bounds */ + BYTE const* const istart = (BYTE const*)src; + BYTE const* const iend = istart + srcSize; + /* Input positions */ + BYTE const* ip = istart; + + DEBUGLOG(5, "ZSTD_ldm_blockCompress: srcSize=%zu", srcSize); + /* If using opt parser, use LDMs only as candidates rather than always accepting them */ + if (cParams->strategy >= ZSTD_btopt) { + size_t lastLLSize; + ms->ldmSeqStore = rawSeqStore; + lastLLSize = blockCompressor(ms, seqStore, rep, src, srcSize); + ZSTD_ldm_skipRawSeqStoreBytes(rawSeqStore, srcSize); + return lastLLSize; + } + + assert(rawSeqStore->pos <= rawSeqStore->size); + assert(rawSeqStore->size <= rawSeqStore->capacity); + /* Loop through each sequence and apply the block compressor to the literals */ + while (rawSeqStore->pos < rawSeqStore->size && ip < iend) { + /* maybeSplitSequence updates rawSeqStore->pos */ + rawSeq const sequence = maybeSplitSequence(rawSeqStore, + (U32)(iend - ip), minMatch); + int i; + /* End signal */ + if (sequence.offset == 0) + break; + + assert(ip + sequence.litLength + sequence.matchLength <= iend); + + /* Fill tables for block compressor */ + ZSTD_ldm_limitTableUpdate(ms, ip); + ZSTD_ldm_fillFastTables(ms, ip); + /* Run the block compressor */ + DEBUGLOG(5, "pos %u : calling block compressor on segment of size %u", (unsigned)(ip-istart), sequence.litLength); + { + size_t const newLitLength = + blockCompressor(ms, seqStore, rep, ip, sequence.litLength); + ip += sequence.litLength; + /* Update the repcodes */ + for (i = ZSTD_REP_NUM - 1; i > 0; i--) + rep[i] = rep[i-1]; + rep[0] = sequence.offset; + /* Store the sequence */ + ZSTD_storeSeq(seqStore, newLitLength, ip - newLitLength, iend, + sequence.offset + ZSTD_REP_MOVE, + sequence.matchLength - MINMATCH); + ip += sequence.matchLength; + } + } + /* Fill the tables for the block compressor */ + ZSTD_ldm_limitTableUpdate(ms, ip); + ZSTD_ldm_fillFastTables(ms, ip); + /* Compress the last literals */ + return blockCompressor(ms, seqStore, rep, ip, iend - ip); +} diff --git a/external/zstd/lib/compress/zstd_ldm.h b/external/zstd/lib/compress/zstd_ldm.h new file mode 100644 index 00000000..393466fa --- /dev/null +++ b/external/zstd/lib/compress/zstd_ldm.h @@ -0,0 +1,117 @@ +/* + * Copyright (c) Yann Collet, Facebook, Inc. + * All rights reserved. + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. + */ + +#ifndef ZSTD_LDM_H +#define ZSTD_LDM_H + +#if defined (__cplusplus) +extern "C" { +#endif + +#include "zstd_compress_internal.h" /* ldmParams_t, U32 */ +#include "../zstd.h" /* ZSTD_CCtx, size_t */ + +/*-************************************* +* Long distance matching +***************************************/ + +#define ZSTD_LDM_DEFAULT_WINDOW_LOG ZSTD_WINDOWLOG_LIMIT_DEFAULT + +void ZSTD_ldm_fillHashTable( + ldmState_t* state, const BYTE* ip, + const BYTE* iend, ldmParams_t const* params); + +/** + * ZSTD_ldm_generateSequences(): + * + * Generates the sequences using the long distance match finder. + * Generates long range matching sequences in `sequences`, which parse a prefix + * of the source. `sequences` must be large enough to store every sequence, + * which can be checked with `ZSTD_ldm_getMaxNbSeq()`. + * @returns 0 or an error code. + * + * NOTE: The user must have called ZSTD_window_update() for all of the input + * they have, even if they pass it to ZSTD_ldm_generateSequences() in chunks. + * NOTE: This function returns an error if it runs out of space to store + * sequences. + */ +size_t ZSTD_ldm_generateSequences( + ldmState_t* ldms, rawSeqStore_t* sequences, + ldmParams_t const* params, void const* src, size_t srcSize); + +/** + * ZSTD_ldm_blockCompress(): + * + * Compresses a block using the predefined sequences, along with a secondary + * block compressor. The literals section of every sequence is passed to the + * secondary block compressor, and those sequences are interspersed with the + * predefined sequences. Returns the length of the last literals. + * Updates `rawSeqStore.pos` to indicate how many sequences have been consumed. + * `rawSeqStore.seq` may also be updated to split the last sequence between two + * blocks. + * @return The length of the last literals. + * + * NOTE: The source must be at most the maximum block size, but the predefined + * sequences can be any size, and may be longer than the block. In the case that + * they are longer than the block, the last sequences may need to be split into + * two. We handle that case correctly, and update `rawSeqStore` appropriately. + * NOTE: This function does not return any errors. + */ +size_t ZSTD_ldm_blockCompress(rawSeqStore_t* rawSeqStore, + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + ZSTD_useRowMatchFinderMode_e useRowMatchFinder, + void const* src, size_t srcSize); + +/** + * ZSTD_ldm_skipSequences(): + * + * Skip past `srcSize` bytes worth of sequences in `rawSeqStore`. + * Avoids emitting matches less than `minMatch` bytes. + * Must be called for data that is not passed to ZSTD_ldm_blockCompress(). + */ +void ZSTD_ldm_skipSequences(rawSeqStore_t* rawSeqStore, size_t srcSize, + U32 const minMatch); + +/* ZSTD_ldm_skipRawSeqStoreBytes(): + * Moves forward in rawSeqStore by nbBytes, updating fields 'pos' and 'posInSequence'. + * Not to be used in conjunction with ZSTD_ldm_skipSequences(). + * Must be called for data with is not passed to ZSTD_ldm_blockCompress(). + */ +void ZSTD_ldm_skipRawSeqStoreBytes(rawSeqStore_t* rawSeqStore, size_t nbBytes); + +/** ZSTD_ldm_getTableSize() : + * Estimate the space needed for long distance matching tables or 0 if LDM is + * disabled. + */ +size_t ZSTD_ldm_getTableSize(ldmParams_t params); + +/** ZSTD_ldm_getSeqSpace() : + * Return an upper bound on the number of sequences that can be produced by + * the long distance matcher, or 0 if LDM is disabled. + */ +size_t ZSTD_ldm_getMaxNbSeq(ldmParams_t params, size_t maxChunkSize); + +/** ZSTD_ldm_adjustParameters() : + * If the params->hashRateLog is not set, set it to its default value based on + * windowLog and params->hashLog. + * + * Ensures that params->bucketSizeLog is <= params->hashLog (setting it to + * params->hashLog if it is not). + * + * Ensures that the minMatchLength >= targetLength during optimal parsing. + */ +void ZSTD_ldm_adjustParameters(ldmParams_t* params, + ZSTD_compressionParameters const* cParams); + +#if defined (__cplusplus) +} +#endif + +#endif /* ZSTD_FAST_H */ diff --git a/external/zstd/lib/compress/zstd_ldm_geartab.h b/external/zstd/lib/compress/zstd_ldm_geartab.h new file mode 100644 index 00000000..e5c24d85 --- /dev/null +++ b/external/zstd/lib/compress/zstd_ldm_geartab.h @@ -0,0 +1,103 @@ +/* + * Copyright (c) Yann Collet, Facebook, Inc. + * All rights reserved. + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. + */ + +#ifndef ZSTD_LDM_GEARTAB_H +#define ZSTD_LDM_GEARTAB_H + +static U64 ZSTD_ldm_gearTab[256] = { + 0xf5b8f72c5f77775c, 0x84935f266b7ac412, 0xb647ada9ca730ccc, + 0xb065bb4b114fb1de, 0x34584e7e8c3a9fd0, 0x4e97e17c6ae26b05, + 0x3a03d743bc99a604, 0xcecd042422c4044f, 0x76de76c58524259e, + 0x9c8528f65badeaca, 0x86563706e2097529, 0x2902475fa375d889, + 0xafb32a9739a5ebe6, 0xce2714da3883e639, 0x21eaf821722e69e, + 0x37b628620b628, 0x49a8d455d88caf5, 0x8556d711e6958140, + 0x4f7ae74fc605c1f, 0x829f0c3468bd3a20, 0x4ffdc885c625179e, + 0x8473de048a3daf1b, 0x51008822b05646b2, 0x69d75d12b2d1cc5f, + 0x8c9d4a19159154bc, 0xc3cc10f4abbd4003, 0xd06ddc1cecb97391, + 0xbe48e6e7ed80302e, 0x3481db31cee03547, 0xacc3f67cdaa1d210, + 0x65cb771d8c7f96cc, 0x8eb27177055723dd, 0xc789950d44cd94be, + 0x934feadc3700b12b, 0x5e485f11edbdf182, 0x1e2e2a46fd64767a, + 0x2969ca71d82efa7c, 0x9d46e9935ebbba2e, 0xe056b67e05e6822b, + 0x94d73f55739d03a0, 0xcd7010bdb69b5a03, 0x455ef9fcd79b82f4, + 0x869cb54a8749c161, 0x38d1a4fa6185d225, 0xb475166f94bbe9bb, + 0xa4143548720959f1, 0x7aed4780ba6b26ba, 0xd0ce264439e02312, + 0x84366d746078d508, 0xa8ce973c72ed17be, 0x21c323a29a430b01, + 0x9962d617e3af80ee, 0xab0ce91d9c8cf75b, 0x530e8ee6d19a4dbc, + 0x2ef68c0cf53f5d72, 0xc03a681640a85506, 0x496e4e9f9c310967, + 0x78580472b59b14a0, 0x273824c23b388577, 0x66bf923ad45cb553, + 0x47ae1a5a2492ba86, 0x35e304569e229659, 0x4765182a46870b6f, + 0x6cbab625e9099412, 0xddac9a2e598522c1, 0x7172086e666624f2, + 0xdf5003ca503b7837, 0x88c0c1db78563d09, 0x58d51865acfc289d, + 0x177671aec65224f1, 0xfb79d8a241e967d7, 0x2be1e101cad9a49a, + 0x6625682f6e29186b, 0x399553457ac06e50, 0x35dffb4c23abb74, + 0x429db2591f54aade, 0xc52802a8037d1009, 0x6acb27381f0b25f3, + 0xf45e2551ee4f823b, 0x8b0ea2d99580c2f7, 0x3bed519cbcb4e1e1, + 0xff452823dbb010a, 0x9d42ed614f3dd267, 0x5b9313c06257c57b, + 0xa114b8008b5e1442, 0xc1fe311c11c13d4b, 0x66e8763ea34c5568, + 0x8b982af1c262f05d, 0xee8876faaa75fbb7, 0x8a62a4d0d172bb2a, + 0xc13d94a3b7449a97, 0x6dbbba9dc15d037c, 0xc786101f1d92e0f1, + 0xd78681a907a0b79b, 0xf61aaf2962c9abb9, 0x2cfd16fcd3cb7ad9, + 0x868c5b6744624d21, 0x25e650899c74ddd7, 0xba042af4a7c37463, + 0x4eb1a539465a3eca, 0xbe09dbf03b05d5ca, 0x774e5a362b5472ba, + 0x47a1221229d183cd, 0x504b0ca18ef5a2df, 0xdffbdfbde2456eb9, + 0x46cd2b2fbee34634, 0xf2aef8fe819d98c3, 0x357f5276d4599d61, + 0x24a5483879c453e3, 0x88026889192b4b9, 0x28da96671782dbec, + 0x4ef37c40588e9aaa, 0x8837b90651bc9fb3, 0xc164f741d3f0e5d6, + 0xbc135a0a704b70ba, 0x69cd868f7622ada, 0xbc37ba89e0b9c0ab, + 0x47c14a01323552f6, 0x4f00794bacee98bb, 0x7107de7d637a69d5, + 0x88af793bb6f2255e, 0xf3c6466b8799b598, 0xc288c616aa7f3b59, + 0x81ca63cf42fca3fd, 0x88d85ace36a2674b, 0xd056bd3792389e7, + 0xe55c396c4e9dd32d, 0xbefb504571e6c0a6, 0x96ab32115e91e8cc, + 0xbf8acb18de8f38d1, 0x66dae58801672606, 0x833b6017872317fb, + 0xb87c16f2d1c92864, 0xdb766a74e58b669c, 0x89659f85c61417be, + 0xc8daad856011ea0c, 0x76a4b565b6fe7eae, 0xa469d085f6237312, + 0xaaf0365683a3e96c, 0x4dbb746f8424f7b8, 0x638755af4e4acc1, + 0x3d7807f5bde64486, 0x17be6d8f5bbb7639, 0x903f0cd44dc35dc, + 0x67b672eafdf1196c, 0xa676ff93ed4c82f1, 0x521d1004c5053d9d, + 0x37ba9ad09ccc9202, 0x84e54d297aacfb51, 0xa0b4b776a143445, + 0x820d471e20b348e, 0x1874383cb83d46dc, 0x97edeec7a1efe11c, + 0xb330e50b1bdc42aa, 0x1dd91955ce70e032, 0xa514cdb88f2939d5, + 0x2791233fd90db9d3, 0x7b670a4cc50f7a9b, 0x77c07d2a05c6dfa5, + 0xe3778b6646d0a6fa, 0xb39c8eda47b56749, 0x933ed448addbef28, + 0xaf846af6ab7d0bf4, 0xe5af208eb666e49, 0x5e6622f73534cd6a, + 0x297daeca42ef5b6e, 0x862daef3d35539a6, 0xe68722498f8e1ea9, + 0x981c53093dc0d572, 0xfa09b0bfbf86fbf5, 0x30b1e96166219f15, + 0x70e7d466bdc4fb83, 0x5a66736e35f2a8e9, 0xcddb59d2b7c1baef, + 0xd6c7d247d26d8996, 0xea4e39eac8de1ba3, 0x539c8bb19fa3aff2, + 0x9f90e4c5fd508d8, 0xa34e5956fbaf3385, 0x2e2f8e151d3ef375, + 0x173691e9b83faec1, 0xb85a8d56bf016379, 0x8382381267408ae3, + 0xb90f901bbdc0096d, 0x7c6ad32933bcec65, 0x76bb5e2f2c8ad595, + 0x390f851a6cf46d28, 0xc3e6064da1c2da72, 0xc52a0c101cfa5389, + 0xd78eaf84a3fbc530, 0x3781b9e2288b997e, 0x73c2f6dea83d05c4, + 0x4228e364c5b5ed7, 0x9d7a3edf0da43911, 0x8edcfeda24686756, + 0x5e7667a7b7a9b3a1, 0x4c4f389fa143791d, 0xb08bc1023da7cddc, + 0x7ab4be3ae529b1cc, 0x754e6132dbe74ff9, 0x71635442a839df45, + 0x2f6fb1643fbe52de, 0x961e0a42cf7a8177, 0xf3b45d83d89ef2ea, + 0xee3de4cf4a6e3e9b, 0xcd6848542c3295e7, 0xe4cee1664c78662f, + 0x9947548b474c68c4, 0x25d73777a5ed8b0b, 0xc915b1d636b7fc, + 0x21c2ba75d9b0d2da, 0x5f6b5dcf608a64a1, 0xdcf333255ff9570c, + 0x633b922418ced4ee, 0xc136dde0b004b34a, 0x58cc83b05d4b2f5a, + 0x5eb424dda28e42d2, 0x62df47369739cd98, 0xb4e0b42485e4ce17, + 0x16e1f0c1f9a8d1e7, 0x8ec3916707560ebf, 0x62ba6e2df2cc9db3, + 0xcbf9f4ff77d83a16, 0x78d9d7d07d2bbcc4, 0xef554ce1e02c41f4, + 0x8d7581127eccf94d, 0xa9b53336cb3c8a05, 0x38c42c0bf45c4f91, + 0x640893cdf4488863, 0x80ec34bc575ea568, 0x39f324f5b48eaa40, + 0xe9d9ed1f8eff527f, 0x9224fc058cc5a214, 0xbaba00b04cfe7741, + 0x309a9f120fcf52af, 0xa558f3ec65626212, 0x424bec8b7adabe2f, + 0x41622513a6aea433, 0xb88da2d5324ca798, 0xd287733b245528a4, + 0x9a44697e6d68aec3, 0x7b1093be2f49bb28, 0x50bbec632e3d8aad, + 0x6cd90723e1ea8283, 0x897b9e7431b02bf3, 0x219efdcb338a7047, + 0x3b0311f0a27c0656, 0xdb17bf91c0db96e7, 0x8cd4fd6b4e85a5b2, + 0xfab071054ba6409d, 0x40d6fe831fa9dfd9, 0xaf358debad7d791e, + 0xeb8d0e25a65e3e58, 0xbbcbd3df14e08580, 0xcf751f27ecdab2b, + 0x2b4da14f2613d8f4 +}; + +#endif /* ZSTD_LDM_GEARTAB_H */ diff --git a/external/zstd/lib/compress/zstd_opt.c b/external/zstd/lib/compress/zstd_opt.c new file mode 100644 index 00000000..402a7e5c --- /dev/null +++ b/external/zstd/lib/compress/zstd_opt.c @@ -0,0 +1,1345 @@ +/* + * Copyright (c) Przemyslaw Skibinski, Yann Collet, Facebook, Inc. + * All rights reserved. + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. + */ + +#include "zstd_compress_internal.h" +#include "hist.h" +#include "zstd_opt.h" + + +#define ZSTD_LITFREQ_ADD 2 /* scaling factor for litFreq, so that frequencies adapt faster to new stats */ +#define ZSTD_FREQ_DIV 4 /* log factor when using previous stats to init next stats */ +#define ZSTD_MAX_PRICE (1<<30) + +#define ZSTD_PREDEF_THRESHOLD 1024 /* if srcSize < ZSTD_PREDEF_THRESHOLD, symbols' cost is assumed static, directly determined by pre-defined distributions */ + + +/*-************************************* +* Price functions for optimal parser +***************************************/ + +#if 0 /* approximation at bit level */ +# define BITCOST_ACCURACY 0 +# define BITCOST_MULTIPLIER (1 << BITCOST_ACCURACY) +# define WEIGHT(stat) ((void)opt, ZSTD_bitWeight(stat)) +#elif 0 /* fractional bit accuracy */ +# define BITCOST_ACCURACY 8 +# define BITCOST_MULTIPLIER (1 << BITCOST_ACCURACY) +# define WEIGHT(stat,opt) ((void)opt, ZSTD_fracWeight(stat)) +#else /* opt==approx, ultra==accurate */ +# define BITCOST_ACCURACY 8 +# define BITCOST_MULTIPLIER (1 << BITCOST_ACCURACY) +# define WEIGHT(stat,opt) (opt ? ZSTD_fracWeight(stat) : ZSTD_bitWeight(stat)) +#endif + +MEM_STATIC U32 ZSTD_bitWeight(U32 stat) +{ + return (ZSTD_highbit32(stat+1) * BITCOST_MULTIPLIER); +} + +MEM_STATIC U32 ZSTD_fracWeight(U32 rawStat) +{ + U32 const stat = rawStat + 1; + U32 const hb = ZSTD_highbit32(stat); + U32 const BWeight = hb * BITCOST_MULTIPLIER; + U32 const FWeight = (stat << BITCOST_ACCURACY) >> hb; + U32 const weight = BWeight + FWeight; + assert(hb + BITCOST_ACCURACY < 31); + return weight; +} + +#if (DEBUGLEVEL>=2) +/* debugging function, + * @return price in bytes as fractional value + * for debug messages only */ +MEM_STATIC double ZSTD_fCost(U32 price) +{ + return (double)price / (BITCOST_MULTIPLIER*8); +} +#endif + +static int ZSTD_compressedLiterals(optState_t const* const optPtr) +{ + return optPtr->literalCompressionMode != ZSTD_lcm_uncompressed; +} + +static void ZSTD_setBasePrices(optState_t* optPtr, int optLevel) +{ + if (ZSTD_compressedLiterals(optPtr)) + optPtr->litSumBasePrice = WEIGHT(optPtr->litSum, optLevel); + optPtr->litLengthSumBasePrice = WEIGHT(optPtr->litLengthSum, optLevel); + optPtr->matchLengthSumBasePrice = WEIGHT(optPtr->matchLengthSum, optLevel); + optPtr->offCodeSumBasePrice = WEIGHT(optPtr->offCodeSum, optLevel); +} + + +/* ZSTD_downscaleStat() : + * reduce all elements in table by a factor 2^(ZSTD_FREQ_DIV+malus) + * return the resulting sum of elements */ +static U32 ZSTD_downscaleStat(unsigned* table, U32 lastEltIndex, int malus) +{ + U32 s, sum=0; + DEBUGLOG(5, "ZSTD_downscaleStat (nbElts=%u)", (unsigned)lastEltIndex+1); + assert(ZSTD_FREQ_DIV+malus > 0 && ZSTD_FREQ_DIV+malus < 31); + for (s=0; s> (ZSTD_FREQ_DIV+malus)); + sum += table[s]; + } + return sum; +} + +/* ZSTD_rescaleFreqs() : + * if first block (detected by optPtr->litLengthSum == 0) : init statistics + * take hints from dictionary if there is one + * or init from zero, using src for literals stats, or flat 1 for match symbols + * otherwise downscale existing stats, to be used as seed for next block. + */ +static void +ZSTD_rescaleFreqs(optState_t* const optPtr, + const BYTE* const src, size_t const srcSize, + int const optLevel) +{ + int const compressedLiterals = ZSTD_compressedLiterals(optPtr); + DEBUGLOG(5, "ZSTD_rescaleFreqs (srcSize=%u)", (unsigned)srcSize); + optPtr->priceType = zop_dynamic; + + if (optPtr->litLengthSum == 0) { /* first block : init */ + if (srcSize <= ZSTD_PREDEF_THRESHOLD) { /* heuristic */ + DEBUGLOG(5, "(srcSize <= ZSTD_PREDEF_THRESHOLD) => zop_predef"); + optPtr->priceType = zop_predef; + } + + assert(optPtr->symbolCosts != NULL); + if (optPtr->symbolCosts->huf.repeatMode == HUF_repeat_valid) { + /* huffman table presumed generated by dictionary */ + optPtr->priceType = zop_dynamic; + + if (compressedLiterals) { + unsigned lit; + assert(optPtr->litFreq != NULL); + optPtr->litSum = 0; + for (lit=0; lit<=MaxLit; lit++) { + U32 const scaleLog = 11; /* scale to 2K */ + U32 const bitCost = HUF_getNbBits(optPtr->symbolCosts->huf.CTable, lit); + assert(bitCost <= scaleLog); + optPtr->litFreq[lit] = bitCost ? 1 << (scaleLog-bitCost) : 1 /*minimum to calculate cost*/; + optPtr->litSum += optPtr->litFreq[lit]; + } } + + { unsigned ll; + FSE_CState_t llstate; + FSE_initCState(&llstate, optPtr->symbolCosts->fse.litlengthCTable); + optPtr->litLengthSum = 0; + for (ll=0; ll<=MaxLL; ll++) { + U32 const scaleLog = 10; /* scale to 1K */ + U32 const bitCost = FSE_getMaxNbBits(llstate.symbolTT, ll); + assert(bitCost < scaleLog); + optPtr->litLengthFreq[ll] = bitCost ? 1 << (scaleLog-bitCost) : 1 /*minimum to calculate cost*/; + optPtr->litLengthSum += optPtr->litLengthFreq[ll]; + } } + + { unsigned ml; + FSE_CState_t mlstate; + FSE_initCState(&mlstate, optPtr->symbolCosts->fse.matchlengthCTable); + optPtr->matchLengthSum = 0; + for (ml=0; ml<=MaxML; ml++) { + U32 const scaleLog = 10; + U32 const bitCost = FSE_getMaxNbBits(mlstate.symbolTT, ml); + assert(bitCost < scaleLog); + optPtr->matchLengthFreq[ml] = bitCost ? 1 << (scaleLog-bitCost) : 1 /*minimum to calculate cost*/; + optPtr->matchLengthSum += optPtr->matchLengthFreq[ml]; + } } + + { unsigned of; + FSE_CState_t ofstate; + FSE_initCState(&ofstate, optPtr->symbolCosts->fse.offcodeCTable); + optPtr->offCodeSum = 0; + for (of=0; of<=MaxOff; of++) { + U32 const scaleLog = 10; + U32 const bitCost = FSE_getMaxNbBits(ofstate.symbolTT, of); + assert(bitCost < scaleLog); + optPtr->offCodeFreq[of] = bitCost ? 1 << (scaleLog-bitCost) : 1 /*minimum to calculate cost*/; + optPtr->offCodeSum += optPtr->offCodeFreq[of]; + } } + + } else { /* not a dictionary */ + + assert(optPtr->litFreq != NULL); + if (compressedLiterals) { + unsigned lit = MaxLit; + HIST_count_simple(optPtr->litFreq, &lit, src, srcSize); /* use raw first block to init statistics */ + optPtr->litSum = ZSTD_downscaleStat(optPtr->litFreq, MaxLit, 1); + } + + { unsigned ll; + for (ll=0; ll<=MaxLL; ll++) + optPtr->litLengthFreq[ll] = 1; + } + optPtr->litLengthSum = MaxLL+1; + + { unsigned ml; + for (ml=0; ml<=MaxML; ml++) + optPtr->matchLengthFreq[ml] = 1; + } + optPtr->matchLengthSum = MaxML+1; + + { unsigned of; + for (of=0; of<=MaxOff; of++) + optPtr->offCodeFreq[of] = 1; + } + optPtr->offCodeSum = MaxOff+1; + + } + + } else { /* new block : re-use previous statistics, scaled down */ + + if (compressedLiterals) + optPtr->litSum = ZSTD_downscaleStat(optPtr->litFreq, MaxLit, 1); + optPtr->litLengthSum = ZSTD_downscaleStat(optPtr->litLengthFreq, MaxLL, 0); + optPtr->matchLengthSum = ZSTD_downscaleStat(optPtr->matchLengthFreq, MaxML, 0); + optPtr->offCodeSum = ZSTD_downscaleStat(optPtr->offCodeFreq, MaxOff, 0); + } + + ZSTD_setBasePrices(optPtr, optLevel); +} + +/* ZSTD_rawLiteralsCost() : + * price of literals (only) in specified segment (which length can be 0). + * does not include price of literalLength symbol */ +static U32 ZSTD_rawLiteralsCost(const BYTE* const literals, U32 const litLength, + const optState_t* const optPtr, + int optLevel) +{ + if (litLength == 0) return 0; + + if (!ZSTD_compressedLiterals(optPtr)) + return (litLength << 3) * BITCOST_MULTIPLIER; /* Uncompressed - 8 bytes per literal. */ + + if (optPtr->priceType == zop_predef) + return (litLength*6) * BITCOST_MULTIPLIER; /* 6 bit per literal - no statistic used */ + + /* dynamic statistics */ + { U32 price = litLength * optPtr->litSumBasePrice; + U32 u; + for (u=0; u < litLength; u++) { + assert(WEIGHT(optPtr->litFreq[literals[u]], optLevel) <= optPtr->litSumBasePrice); /* literal cost should never be negative */ + price -= WEIGHT(optPtr->litFreq[literals[u]], optLevel); + } + return price; + } +} + +/* ZSTD_litLengthPrice() : + * cost of literalLength symbol */ +static U32 ZSTD_litLengthPrice(U32 const litLength, const optState_t* const optPtr, int optLevel) +{ + if (optPtr->priceType == zop_predef) return WEIGHT(litLength, optLevel); + + /* dynamic statistics */ + { U32 const llCode = ZSTD_LLcode(litLength); + return (LL_bits[llCode] * BITCOST_MULTIPLIER) + + optPtr->litLengthSumBasePrice + - WEIGHT(optPtr->litLengthFreq[llCode], optLevel); + } +} + +/* ZSTD_getMatchPrice() : + * Provides the cost of the match part (offset + matchLength) of a sequence + * Must be combined with ZSTD_fullLiteralsCost() to get the full cost of a sequence. + * optLevel: when <2, favors small offset for decompression speed (improved cache efficiency) */ +FORCE_INLINE_TEMPLATE U32 +ZSTD_getMatchPrice(U32 const offset, + U32 const matchLength, + const optState_t* const optPtr, + int const optLevel) +{ + U32 price; + U32 const offCode = ZSTD_highbit32(offset+1); + U32 const mlBase = matchLength - MINMATCH; + assert(matchLength >= MINMATCH); + + if (optPtr->priceType == zop_predef) /* fixed scheme, do not use statistics */ + return WEIGHT(mlBase, optLevel) + ((16 + offCode) * BITCOST_MULTIPLIER); + + /* dynamic statistics */ + price = (offCode * BITCOST_MULTIPLIER) + (optPtr->offCodeSumBasePrice - WEIGHT(optPtr->offCodeFreq[offCode], optLevel)); + if ((optLevel<2) /*static*/ && offCode >= 20) + price += (offCode-19)*2 * BITCOST_MULTIPLIER; /* handicap for long distance offsets, favor decompression speed */ + + /* match Length */ + { U32 const mlCode = ZSTD_MLcode(mlBase); + price += (ML_bits[mlCode] * BITCOST_MULTIPLIER) + (optPtr->matchLengthSumBasePrice - WEIGHT(optPtr->matchLengthFreq[mlCode], optLevel)); + } + + price += BITCOST_MULTIPLIER / 5; /* heuristic : make matches a bit more costly to favor less sequences -> faster decompression speed */ + + DEBUGLOG(8, "ZSTD_getMatchPrice(ml:%u) = %u", matchLength, price); + return price; +} + +/* ZSTD_updateStats() : + * assumption : literals + litLengtn <= iend */ +static void ZSTD_updateStats(optState_t* const optPtr, + U32 litLength, const BYTE* literals, + U32 offsetCode, U32 matchLength) +{ + /* literals */ + if (ZSTD_compressedLiterals(optPtr)) { + U32 u; + for (u=0; u < litLength; u++) + optPtr->litFreq[literals[u]] += ZSTD_LITFREQ_ADD; + optPtr->litSum += litLength*ZSTD_LITFREQ_ADD; + } + + /* literal Length */ + { U32 const llCode = ZSTD_LLcode(litLength); + optPtr->litLengthFreq[llCode]++; + optPtr->litLengthSum++; + } + + /* match offset code (0-2=>repCode; 3+=>offset+2) */ + { U32 const offCode = ZSTD_highbit32(offsetCode+1); + assert(offCode <= MaxOff); + optPtr->offCodeFreq[offCode]++; + optPtr->offCodeSum++; + } + + /* match Length */ + { U32 const mlBase = matchLength - MINMATCH; + U32 const mlCode = ZSTD_MLcode(mlBase); + optPtr->matchLengthFreq[mlCode]++; + optPtr->matchLengthSum++; + } +} + + +/* ZSTD_readMINMATCH() : + * function safe only for comparisons + * assumption : memPtr must be at least 4 bytes before end of buffer */ +MEM_STATIC U32 ZSTD_readMINMATCH(const void* memPtr, U32 length) +{ + switch (length) + { + default : + case 4 : return MEM_read32(memPtr); + case 3 : if (MEM_isLittleEndian()) + return MEM_read32(memPtr)<<8; + else + return MEM_read32(memPtr)>>8; + } +} + + +/* Update hashTable3 up to ip (excluded) + Assumption : always within prefix (i.e. not within extDict) */ +static U32 ZSTD_insertAndFindFirstIndexHash3 (ZSTD_matchState_t* ms, + U32* nextToUpdate3, + const BYTE* const ip) +{ + U32* const hashTable3 = ms->hashTable3; + U32 const hashLog3 = ms->hashLog3; + const BYTE* const base = ms->window.base; + U32 idx = *nextToUpdate3; + U32 const target = (U32)(ip - base); + size_t const hash3 = ZSTD_hash3Ptr(ip, hashLog3); + assert(hashLog3 > 0); + + while(idx < target) { + hashTable3[ZSTD_hash3Ptr(base+idx, hashLog3)] = idx; + idx++; + } + + *nextToUpdate3 = target; + return hashTable3[hash3]; +} + + +/*-************************************* +* Binary Tree search +***************************************/ +/** ZSTD_insertBt1() : add one or multiple positions to tree. + * ip : assumed <= iend-8 . + * @return : nb of positions added */ +static U32 ZSTD_insertBt1( + ZSTD_matchState_t* ms, + const BYTE* const ip, const BYTE* const iend, + U32 const mls, const int extDict) +{ + const ZSTD_compressionParameters* const cParams = &ms->cParams; + U32* const hashTable = ms->hashTable; + U32 const hashLog = cParams->hashLog; + size_t const h = ZSTD_hashPtr(ip, hashLog, mls); + U32* const bt = ms->chainTable; + U32 const btLog = cParams->chainLog - 1; + U32 const btMask = (1 << btLog) - 1; + U32 matchIndex = hashTable[h]; + size_t commonLengthSmaller=0, commonLengthLarger=0; + const BYTE* const base = ms->window.base; + const BYTE* const dictBase = ms->window.dictBase; + const U32 dictLimit = ms->window.dictLimit; + const BYTE* const dictEnd = dictBase + dictLimit; + const BYTE* const prefixStart = base + dictLimit; + const BYTE* match; + const U32 curr = (U32)(ip-base); + const U32 btLow = btMask >= curr ? 0 : curr - btMask; + U32* smallerPtr = bt + 2*(curr&btMask); + U32* largerPtr = smallerPtr + 1; + U32 dummy32; /* to be nullified at the end */ + U32 const windowLow = ms->window.lowLimit; + U32 matchEndIdx = curr+8+1; + size_t bestLength = 8; + U32 nbCompares = 1U << cParams->searchLog; +#ifdef ZSTD_C_PREDICT + U32 predictedSmall = *(bt + 2*((curr-1)&btMask) + 0); + U32 predictedLarge = *(bt + 2*((curr-1)&btMask) + 1); + predictedSmall += (predictedSmall>0); + predictedLarge += (predictedLarge>0); +#endif /* ZSTD_C_PREDICT */ + + DEBUGLOG(8, "ZSTD_insertBt1 (%u)", curr); + + assert(ip <= iend-8); /* required for h calculation */ + hashTable[h] = curr; /* Update Hash Table */ + + assert(windowLow > 0); + while (nbCompares-- && (matchIndex >= windowLow)) { + U32* const nextPtr = bt + 2*(matchIndex & btMask); + size_t matchLength = MIN(commonLengthSmaller, commonLengthLarger); /* guaranteed minimum nb of common bytes */ + assert(matchIndex < curr); + +#ifdef ZSTD_C_PREDICT /* note : can create issues when hlog small <= 11 */ + const U32* predictPtr = bt + 2*((matchIndex-1) & btMask); /* written this way, as bt is a roll buffer */ + if (matchIndex == predictedSmall) { + /* no need to check length, result known */ + *smallerPtr = matchIndex; + if (matchIndex <= btLow) { smallerPtr=&dummy32; break; } /* beyond tree size, stop the search */ + smallerPtr = nextPtr+1; /* new "smaller" => larger of match */ + matchIndex = nextPtr[1]; /* new matchIndex larger than previous (closer to current) */ + predictedSmall = predictPtr[1] + (predictPtr[1]>0); + continue; + } + if (matchIndex == predictedLarge) { + *largerPtr = matchIndex; + if (matchIndex <= btLow) { largerPtr=&dummy32; break; } /* beyond tree size, stop the search */ + largerPtr = nextPtr; + matchIndex = nextPtr[0]; + predictedLarge = predictPtr[0] + (predictPtr[0]>0); + continue; + } +#endif + + if (!extDict || (matchIndex+matchLength >= dictLimit)) { + assert(matchIndex+matchLength >= dictLimit); /* might be wrong if actually extDict */ + match = base + matchIndex; + matchLength += ZSTD_count(ip+matchLength, match+matchLength, iend); + } else { + match = dictBase + matchIndex; + matchLength += ZSTD_count_2segments(ip+matchLength, match+matchLength, iend, dictEnd, prefixStart); + if (matchIndex+matchLength >= dictLimit) + match = base + matchIndex; /* to prepare for next usage of match[matchLength] */ + } + + if (matchLength > bestLength) { + bestLength = matchLength; + if (matchLength > matchEndIdx - matchIndex) + matchEndIdx = matchIndex + (U32)matchLength; + } + + if (ip+matchLength == iend) { /* equal : no way to know if inf or sup */ + break; /* drop , to guarantee consistency ; miss a bit of compression, but other solutions can corrupt tree */ + } + + if (match[matchLength] < ip[matchLength]) { /* necessarily within buffer */ + /* match is smaller than current */ + *smallerPtr = matchIndex; /* update smaller idx */ + commonLengthSmaller = matchLength; /* all smaller will now have at least this guaranteed common length */ + if (matchIndex <= btLow) { smallerPtr=&dummy32; break; } /* beyond tree size, stop searching */ + smallerPtr = nextPtr+1; /* new "candidate" => larger than match, which was smaller than target */ + matchIndex = nextPtr[1]; /* new matchIndex, larger than previous and closer to current */ + } else { + /* match is larger than current */ + *largerPtr = matchIndex; + commonLengthLarger = matchLength; + if (matchIndex <= btLow) { largerPtr=&dummy32; break; } /* beyond tree size, stop searching */ + largerPtr = nextPtr; + matchIndex = nextPtr[0]; + } } + + *smallerPtr = *largerPtr = 0; + { U32 positions = 0; + if (bestLength > 384) positions = MIN(192, (U32)(bestLength - 384)); /* speed optimization */ + assert(matchEndIdx > curr + 8); + return MAX(positions, matchEndIdx - (curr + 8)); + } +} + +FORCE_INLINE_TEMPLATE +void ZSTD_updateTree_internal( + ZSTD_matchState_t* ms, + const BYTE* const ip, const BYTE* const iend, + const U32 mls, const ZSTD_dictMode_e dictMode) +{ + const BYTE* const base = ms->window.base; + U32 const target = (U32)(ip - base); + U32 idx = ms->nextToUpdate; + DEBUGLOG(6, "ZSTD_updateTree_internal, from %u to %u (dictMode:%u)", + idx, target, dictMode); + + while(idx < target) { + U32 const forward = ZSTD_insertBt1(ms, base+idx, iend, mls, dictMode == ZSTD_extDict); + assert(idx < (U32)(idx + forward)); + idx += forward; + } + assert((size_t)(ip - base) <= (size_t)(U32)(-1)); + assert((size_t)(iend - base) <= (size_t)(U32)(-1)); + ms->nextToUpdate = target; +} + +void ZSTD_updateTree(ZSTD_matchState_t* ms, const BYTE* ip, const BYTE* iend) { + ZSTD_updateTree_internal(ms, ip, iend, ms->cParams.minMatch, ZSTD_noDict); +} + +FORCE_INLINE_TEMPLATE +U32 ZSTD_insertBtAndGetAllMatches ( + ZSTD_match_t* matches, /* store result (found matches) in this table (presumed large enough) */ + ZSTD_matchState_t* ms, + U32* nextToUpdate3, + const BYTE* const ip, const BYTE* const iLimit, const ZSTD_dictMode_e dictMode, + const U32 rep[ZSTD_REP_NUM], + U32 const ll0, /* tells if associated literal length is 0 or not. This value must be 0 or 1 */ + const U32 lengthToBeat, + U32 const mls /* template */) +{ + const ZSTD_compressionParameters* const cParams = &ms->cParams; + U32 const sufficient_len = MIN(cParams->targetLength, ZSTD_OPT_NUM -1); + const BYTE* const base = ms->window.base; + U32 const curr = (U32)(ip-base); + U32 const hashLog = cParams->hashLog; + U32 const minMatch = (mls==3) ? 3 : 4; + U32* const hashTable = ms->hashTable; + size_t const h = ZSTD_hashPtr(ip, hashLog, mls); + U32 matchIndex = hashTable[h]; + U32* const bt = ms->chainTable; + U32 const btLog = cParams->chainLog - 1; + U32 const btMask= (1U << btLog) - 1; + size_t commonLengthSmaller=0, commonLengthLarger=0; + const BYTE* const dictBase = ms->window.dictBase; + U32 const dictLimit = ms->window.dictLimit; + const BYTE* const dictEnd = dictBase + dictLimit; + const BYTE* const prefixStart = base + dictLimit; + U32 const btLow = (btMask >= curr) ? 0 : curr - btMask; + U32 const windowLow = ZSTD_getLowestMatchIndex(ms, curr, cParams->windowLog); + U32 const matchLow = windowLow ? windowLow : 1; + U32* smallerPtr = bt + 2*(curr&btMask); + U32* largerPtr = bt + 2*(curr&btMask) + 1; + U32 matchEndIdx = curr+8+1; /* farthest referenced position of any match => detects repetitive patterns */ + U32 dummy32; /* to be nullified at the end */ + U32 mnum = 0; + U32 nbCompares = 1U << cParams->searchLog; + + const ZSTD_matchState_t* dms = dictMode == ZSTD_dictMatchState ? ms->dictMatchState : NULL; + const ZSTD_compressionParameters* const dmsCParams = + dictMode == ZSTD_dictMatchState ? &dms->cParams : NULL; + const BYTE* const dmsBase = dictMode == ZSTD_dictMatchState ? dms->window.base : NULL; + const BYTE* const dmsEnd = dictMode == ZSTD_dictMatchState ? dms->window.nextSrc : NULL; + U32 const dmsHighLimit = dictMode == ZSTD_dictMatchState ? (U32)(dmsEnd - dmsBase) : 0; + U32 const dmsLowLimit = dictMode == ZSTD_dictMatchState ? dms->window.lowLimit : 0; + U32 const dmsIndexDelta = dictMode == ZSTD_dictMatchState ? windowLow - dmsHighLimit : 0; + U32 const dmsHashLog = dictMode == ZSTD_dictMatchState ? dmsCParams->hashLog : hashLog; + U32 const dmsBtLog = dictMode == ZSTD_dictMatchState ? dmsCParams->chainLog - 1 : btLog; + U32 const dmsBtMask = dictMode == ZSTD_dictMatchState ? (1U << dmsBtLog) - 1 : 0; + U32 const dmsBtLow = dictMode == ZSTD_dictMatchState && dmsBtMask < dmsHighLimit - dmsLowLimit ? dmsHighLimit - dmsBtMask : dmsLowLimit; + + size_t bestLength = lengthToBeat-1; + DEBUGLOG(8, "ZSTD_insertBtAndGetAllMatches: current=%u", curr); + + /* check repCode */ + assert(ll0 <= 1); /* necessarily 1 or 0 */ + { U32 const lastR = ZSTD_REP_NUM + ll0; + U32 repCode; + for (repCode = ll0; repCode < lastR; repCode++) { + U32 const repOffset = (repCode==ZSTD_REP_NUM) ? (rep[0] - 1) : rep[repCode]; + U32 const repIndex = curr - repOffset; + U32 repLen = 0; + assert(curr >= dictLimit); + if (repOffset-1 /* intentional overflow, discards 0 and -1 */ < curr-dictLimit) { /* equivalent to `curr > repIndex >= dictLimit` */ + /* We must validate the repcode offset because when we're using a dictionary the + * valid offset range shrinks when the dictionary goes out of bounds. + */ + if ((repIndex >= windowLow) & (ZSTD_readMINMATCH(ip, minMatch) == ZSTD_readMINMATCH(ip - repOffset, minMatch))) { + repLen = (U32)ZSTD_count(ip+minMatch, ip+minMatch-repOffset, iLimit) + minMatch; + } + } else { /* repIndex < dictLimit || repIndex >= curr */ + const BYTE* const repMatch = dictMode == ZSTD_dictMatchState ? + dmsBase + repIndex - dmsIndexDelta : + dictBase + repIndex; + assert(curr >= windowLow); + if ( dictMode == ZSTD_extDict + && ( ((repOffset-1) /*intentional overflow*/ < curr - windowLow) /* equivalent to `curr > repIndex >= windowLow` */ + & (((U32)((dictLimit-1) - repIndex) >= 3) ) /* intentional overflow : do not test positions overlapping 2 memory segments */) + && (ZSTD_readMINMATCH(ip, minMatch) == ZSTD_readMINMATCH(repMatch, minMatch)) ) { + repLen = (U32)ZSTD_count_2segments(ip+minMatch, repMatch+minMatch, iLimit, dictEnd, prefixStart) + minMatch; + } + if (dictMode == ZSTD_dictMatchState + && ( ((repOffset-1) /*intentional overflow*/ < curr - (dmsLowLimit + dmsIndexDelta)) /* equivalent to `curr > repIndex >= dmsLowLimit` */ + & ((U32)((dictLimit-1) - repIndex) >= 3) ) /* intentional overflow : do not test positions overlapping 2 memory segments */ + && (ZSTD_readMINMATCH(ip, minMatch) == ZSTD_readMINMATCH(repMatch, minMatch)) ) { + repLen = (U32)ZSTD_count_2segments(ip+minMatch, repMatch+minMatch, iLimit, dmsEnd, prefixStart) + minMatch; + } } + /* save longer solution */ + if (repLen > bestLength) { + DEBUGLOG(8, "found repCode %u (ll0:%u, offset:%u) of length %u", + repCode, ll0, repOffset, repLen); + bestLength = repLen; + matches[mnum].off = repCode - ll0; + matches[mnum].len = (U32)repLen; + mnum++; + if ( (repLen > sufficient_len) + | (ip+repLen == iLimit) ) { /* best possible */ + return mnum; + } } } } + + /* HC3 match finder */ + if ((mls == 3) /*static*/ && (bestLength < mls)) { + U32 const matchIndex3 = ZSTD_insertAndFindFirstIndexHash3(ms, nextToUpdate3, ip); + if ((matchIndex3 >= matchLow) + & (curr - matchIndex3 < (1<<18)) /*heuristic : longer distance likely too expensive*/ ) { + size_t mlen; + if ((dictMode == ZSTD_noDict) /*static*/ || (dictMode == ZSTD_dictMatchState) /*static*/ || (matchIndex3 >= dictLimit)) { + const BYTE* const match = base + matchIndex3; + mlen = ZSTD_count(ip, match, iLimit); + } else { + const BYTE* const match = dictBase + matchIndex3; + mlen = ZSTD_count_2segments(ip, match, iLimit, dictEnd, prefixStart); + } + + /* save best solution */ + if (mlen >= mls /* == 3 > bestLength */) { + DEBUGLOG(8, "found small match with hlog3, of length %u", + (U32)mlen); + bestLength = mlen; + assert(curr > matchIndex3); + assert(mnum==0); /* no prior solution */ + matches[0].off = (curr - matchIndex3) + ZSTD_REP_MOVE; + matches[0].len = (U32)mlen; + mnum = 1; + if ( (mlen > sufficient_len) | + (ip+mlen == iLimit) ) { /* best possible length */ + ms->nextToUpdate = curr+1; /* skip insertion */ + return 1; + } } } + /* no dictMatchState lookup: dicts don't have a populated HC3 table */ + } + + hashTable[h] = curr; /* Update Hash Table */ + + while (nbCompares-- && (matchIndex >= matchLow)) { + U32* const nextPtr = bt + 2*(matchIndex & btMask); + const BYTE* match; + size_t matchLength = MIN(commonLengthSmaller, commonLengthLarger); /* guaranteed minimum nb of common bytes */ + assert(curr > matchIndex); + + if ((dictMode == ZSTD_noDict) || (dictMode == ZSTD_dictMatchState) || (matchIndex+matchLength >= dictLimit)) { + assert(matchIndex+matchLength >= dictLimit); /* ensure the condition is correct when !extDict */ + match = base + matchIndex; + if (matchIndex >= dictLimit) assert(memcmp(match, ip, matchLength) == 0); /* ensure early section of match is equal as expected */ + matchLength += ZSTD_count(ip+matchLength, match+matchLength, iLimit); + } else { + match = dictBase + matchIndex; + assert(memcmp(match, ip, matchLength) == 0); /* ensure early section of match is equal as expected */ + matchLength += ZSTD_count_2segments(ip+matchLength, match+matchLength, iLimit, dictEnd, prefixStart); + if (matchIndex+matchLength >= dictLimit) + match = base + matchIndex; /* prepare for match[matchLength] read */ + } + + if (matchLength > bestLength) { + DEBUGLOG(8, "found match of length %u at distance %u (offCode=%u)", + (U32)matchLength, curr - matchIndex, curr - matchIndex + ZSTD_REP_MOVE); + assert(matchEndIdx > matchIndex); + if (matchLength > matchEndIdx - matchIndex) + matchEndIdx = matchIndex + (U32)matchLength; + bestLength = matchLength; + matches[mnum].off = (curr - matchIndex) + ZSTD_REP_MOVE; + matches[mnum].len = (U32)matchLength; + mnum++; + if ( (matchLength > ZSTD_OPT_NUM) + | (ip+matchLength == iLimit) /* equal : no way to know if inf or sup */) { + if (dictMode == ZSTD_dictMatchState) nbCompares = 0; /* break should also skip searching dms */ + break; /* drop, to preserve bt consistency (miss a little bit of compression) */ + } + } + + if (match[matchLength] < ip[matchLength]) { + /* match smaller than current */ + *smallerPtr = matchIndex; /* update smaller idx */ + commonLengthSmaller = matchLength; /* all smaller will now have at least this guaranteed common length */ + if (matchIndex <= btLow) { smallerPtr=&dummy32; break; } /* beyond tree size, stop the search */ + smallerPtr = nextPtr+1; /* new candidate => larger than match, which was smaller than current */ + matchIndex = nextPtr[1]; /* new matchIndex, larger than previous, closer to current */ + } else { + *largerPtr = matchIndex; + commonLengthLarger = matchLength; + if (matchIndex <= btLow) { largerPtr=&dummy32; break; } /* beyond tree size, stop the search */ + largerPtr = nextPtr; + matchIndex = nextPtr[0]; + } } + + *smallerPtr = *largerPtr = 0; + + if (dictMode == ZSTD_dictMatchState && nbCompares) { + size_t const dmsH = ZSTD_hashPtr(ip, dmsHashLog, mls); + U32 dictMatchIndex = dms->hashTable[dmsH]; + const U32* const dmsBt = dms->chainTable; + commonLengthSmaller = commonLengthLarger = 0; + while (nbCompares-- && (dictMatchIndex > dmsLowLimit)) { + const U32* const nextPtr = dmsBt + 2*(dictMatchIndex & dmsBtMask); + size_t matchLength = MIN(commonLengthSmaller, commonLengthLarger); /* guaranteed minimum nb of common bytes */ + const BYTE* match = dmsBase + dictMatchIndex; + matchLength += ZSTD_count_2segments(ip+matchLength, match+matchLength, iLimit, dmsEnd, prefixStart); + if (dictMatchIndex+matchLength >= dmsHighLimit) + match = base + dictMatchIndex + dmsIndexDelta; /* to prepare for next usage of match[matchLength] */ + + if (matchLength > bestLength) { + matchIndex = dictMatchIndex + dmsIndexDelta; + DEBUGLOG(8, "found dms match of length %u at distance %u (offCode=%u)", + (U32)matchLength, curr - matchIndex, curr - matchIndex + ZSTD_REP_MOVE); + if (matchLength > matchEndIdx - matchIndex) + matchEndIdx = matchIndex + (U32)matchLength; + bestLength = matchLength; + matches[mnum].off = (curr - matchIndex) + ZSTD_REP_MOVE; + matches[mnum].len = (U32)matchLength; + mnum++; + if ( (matchLength > ZSTD_OPT_NUM) + | (ip+matchLength == iLimit) /* equal : no way to know if inf or sup */) { + break; /* drop, to guarantee consistency (miss a little bit of compression) */ + } + } + + if (dictMatchIndex <= dmsBtLow) { break; } /* beyond tree size, stop the search */ + if (match[matchLength] < ip[matchLength]) { + commonLengthSmaller = matchLength; /* all smaller will now have at least this guaranteed common length */ + dictMatchIndex = nextPtr[1]; /* new matchIndex larger than previous (closer to current) */ + } else { + /* match is larger than current */ + commonLengthLarger = matchLength; + dictMatchIndex = nextPtr[0]; + } + } + } + + assert(matchEndIdx > curr+8); + ms->nextToUpdate = matchEndIdx - 8; /* skip repetitive patterns */ + return mnum; +} + + +FORCE_INLINE_TEMPLATE U32 ZSTD_BtGetAllMatches ( + ZSTD_match_t* matches, /* store result (match found, increasing size) in this table */ + ZSTD_matchState_t* ms, + U32* nextToUpdate3, + const BYTE* ip, const BYTE* const iHighLimit, const ZSTD_dictMode_e dictMode, + const U32 rep[ZSTD_REP_NUM], + U32 const ll0, + U32 const lengthToBeat) +{ + const ZSTD_compressionParameters* const cParams = &ms->cParams; + U32 const matchLengthSearch = cParams->minMatch; + DEBUGLOG(8, "ZSTD_BtGetAllMatches"); + if (ip < ms->window.base + ms->nextToUpdate) return 0; /* skipped area */ + ZSTD_updateTree_internal(ms, ip, iHighLimit, matchLengthSearch, dictMode); + switch(matchLengthSearch) + { + case 3 : return ZSTD_insertBtAndGetAllMatches(matches, ms, nextToUpdate3, ip, iHighLimit, dictMode, rep, ll0, lengthToBeat, 3); + default : + case 4 : return ZSTD_insertBtAndGetAllMatches(matches, ms, nextToUpdate3, ip, iHighLimit, dictMode, rep, ll0, lengthToBeat, 4); + case 5 : return ZSTD_insertBtAndGetAllMatches(matches, ms, nextToUpdate3, ip, iHighLimit, dictMode, rep, ll0, lengthToBeat, 5); + case 7 : + case 6 : return ZSTD_insertBtAndGetAllMatches(matches, ms, nextToUpdate3, ip, iHighLimit, dictMode, rep, ll0, lengthToBeat, 6); + } +} + +/************************* +* LDM helper functions * +*************************/ + +/* Struct containing info needed to make decision about ldm inclusion */ +typedef struct { + rawSeqStore_t seqStore; /* External match candidates store for this block */ + U32 startPosInBlock; /* Start position of the current match candidate */ + U32 endPosInBlock; /* End position of the current match candidate */ + U32 offset; /* Offset of the match candidate */ +} ZSTD_optLdm_t; + +/* ZSTD_optLdm_skipRawSeqStoreBytes(): + * Moves forward in rawSeqStore by nbBytes, which will update the fields 'pos' and 'posInSequence'. + */ +static void ZSTD_optLdm_skipRawSeqStoreBytes(rawSeqStore_t* rawSeqStore, size_t nbBytes) { + U32 currPos = (U32)(rawSeqStore->posInSequence + nbBytes); + while (currPos && rawSeqStore->pos < rawSeqStore->size) { + rawSeq currSeq = rawSeqStore->seq[rawSeqStore->pos]; + if (currPos >= currSeq.litLength + currSeq.matchLength) { + currPos -= currSeq.litLength + currSeq.matchLength; + rawSeqStore->pos++; + } else { + rawSeqStore->posInSequence = currPos; + break; + } + } + if (currPos == 0 || rawSeqStore->pos == rawSeqStore->size) { + rawSeqStore->posInSequence = 0; + } +} + +/* ZSTD_opt_getNextMatchAndUpdateSeqStore(): + * Calculates the beginning and end of the next match in the current block. + * Updates 'pos' and 'posInSequence' of the ldmSeqStore. + */ +static void ZSTD_opt_getNextMatchAndUpdateSeqStore(ZSTD_optLdm_t* optLdm, U32 currPosInBlock, + U32 blockBytesRemaining) { + rawSeq currSeq; + U32 currBlockEndPos; + U32 literalsBytesRemaining; + U32 matchBytesRemaining; + + /* Setting match end position to MAX to ensure we never use an LDM during this block */ + if (optLdm->seqStore.size == 0 || optLdm->seqStore.pos >= optLdm->seqStore.size) { + optLdm->startPosInBlock = UINT_MAX; + optLdm->endPosInBlock = UINT_MAX; + return; + } + /* Calculate appropriate bytes left in matchLength and litLength after adjusting + based on ldmSeqStore->posInSequence */ + currSeq = optLdm->seqStore.seq[optLdm->seqStore.pos]; + assert(optLdm->seqStore.posInSequence <= currSeq.litLength + currSeq.matchLength); + currBlockEndPos = currPosInBlock + blockBytesRemaining; + literalsBytesRemaining = (optLdm->seqStore.posInSequence < currSeq.litLength) ? + currSeq.litLength - (U32)optLdm->seqStore.posInSequence : + 0; + matchBytesRemaining = (literalsBytesRemaining == 0) ? + currSeq.matchLength - ((U32)optLdm->seqStore.posInSequence - currSeq.litLength) : + currSeq.matchLength; + + /* If there are more literal bytes than bytes remaining in block, no ldm is possible */ + if (literalsBytesRemaining >= blockBytesRemaining) { + optLdm->startPosInBlock = UINT_MAX; + optLdm->endPosInBlock = UINT_MAX; + ZSTD_optLdm_skipRawSeqStoreBytes(&optLdm->seqStore, blockBytesRemaining); + return; + } + + /* Matches may be < MINMATCH by this process. In that case, we will reject them + when we are deciding whether or not to add the ldm */ + optLdm->startPosInBlock = currPosInBlock + literalsBytesRemaining; + optLdm->endPosInBlock = optLdm->startPosInBlock + matchBytesRemaining; + optLdm->offset = currSeq.offset; + + if (optLdm->endPosInBlock > currBlockEndPos) { + /* Match ends after the block ends, we can't use the whole match */ + optLdm->endPosInBlock = currBlockEndPos; + ZSTD_optLdm_skipRawSeqStoreBytes(&optLdm->seqStore, currBlockEndPos - currPosInBlock); + } else { + /* Consume nb of bytes equal to size of sequence left */ + ZSTD_optLdm_skipRawSeqStoreBytes(&optLdm->seqStore, literalsBytesRemaining + matchBytesRemaining); + } +} + +/* ZSTD_optLdm_maybeAddMatch(): + * Adds a match if it's long enough, based on it's 'matchStartPosInBlock' + * and 'matchEndPosInBlock', into 'matches'. Maintains the correct ordering of 'matches' + */ +static void ZSTD_optLdm_maybeAddMatch(ZSTD_match_t* matches, U32* nbMatches, + ZSTD_optLdm_t* optLdm, U32 currPosInBlock) { + U32 posDiff = currPosInBlock - optLdm->startPosInBlock; + /* Note: ZSTD_match_t actually contains offCode and matchLength (before subtracting MINMATCH) */ + U32 candidateMatchLength = optLdm->endPosInBlock - optLdm->startPosInBlock - posDiff; + U32 candidateOffCode = optLdm->offset + ZSTD_REP_MOVE; + + /* Ensure that current block position is not outside of the match */ + if (currPosInBlock < optLdm->startPosInBlock + || currPosInBlock >= optLdm->endPosInBlock + || candidateMatchLength < MINMATCH) { + return; + } + + if (*nbMatches == 0 || ((candidateMatchLength > matches[*nbMatches-1].len) && *nbMatches < ZSTD_OPT_NUM)) { + DEBUGLOG(6, "ZSTD_optLdm_maybeAddMatch(): Adding ldm candidate match (offCode: %u matchLength %u) at block position=%u", + candidateOffCode, candidateMatchLength, currPosInBlock); + matches[*nbMatches].len = candidateMatchLength; + matches[*nbMatches].off = candidateOffCode; + (*nbMatches)++; + } +} + +/* ZSTD_optLdm_processMatchCandidate(): + * Wrapper function to update ldm seq store and call ldm functions as necessary. + */ +static void ZSTD_optLdm_processMatchCandidate(ZSTD_optLdm_t* optLdm, ZSTD_match_t* matches, U32* nbMatches, + U32 currPosInBlock, U32 remainingBytes) { + if (optLdm->seqStore.size == 0 || optLdm->seqStore.pos >= optLdm->seqStore.size) { + return; + } + + if (currPosInBlock >= optLdm->endPosInBlock) { + if (currPosInBlock > optLdm->endPosInBlock) { + /* The position at which ZSTD_optLdm_processMatchCandidate() is called is not necessarily + * at the end of a match from the ldm seq store, and will often be some bytes + * over beyond matchEndPosInBlock. As such, we need to correct for these "overshoots" + */ + U32 posOvershoot = currPosInBlock - optLdm->endPosInBlock; + ZSTD_optLdm_skipRawSeqStoreBytes(&optLdm->seqStore, posOvershoot); + } + ZSTD_opt_getNextMatchAndUpdateSeqStore(optLdm, currPosInBlock, remainingBytes); + } + ZSTD_optLdm_maybeAddMatch(matches, nbMatches, optLdm, currPosInBlock); +} + +/*-******************************* +* Optimal parser +*********************************/ + + +static U32 ZSTD_totalLen(ZSTD_optimal_t sol) +{ + return sol.litlen + sol.mlen; +} + +#if 0 /* debug */ + +static void +listStats(const U32* table, int lastEltID) +{ + int const nbElts = lastEltID + 1; + int enb; + for (enb=0; enb < nbElts; enb++) { + (void)table; + /* RAWLOG(2, "%3i:%3i, ", enb, table[enb]); */ + RAWLOG(2, "%4i,", table[enb]); + } + RAWLOG(2, " \n"); +} + +#endif + +FORCE_INLINE_TEMPLATE size_t +ZSTD_compressBlock_opt_generic(ZSTD_matchState_t* ms, + seqStore_t* seqStore, + U32 rep[ZSTD_REP_NUM], + const void* src, size_t srcSize, + const int optLevel, + const ZSTD_dictMode_e dictMode) +{ + optState_t* const optStatePtr = &ms->opt; + const BYTE* const istart = (const BYTE*)src; + const BYTE* ip = istart; + const BYTE* anchor = istart; + const BYTE* const iend = istart + srcSize; + const BYTE* const ilimit = iend - 8; + const BYTE* const base = ms->window.base; + const BYTE* const prefixStart = base + ms->window.dictLimit; + const ZSTD_compressionParameters* const cParams = &ms->cParams; + + U32 const sufficient_len = MIN(cParams->targetLength, ZSTD_OPT_NUM -1); + U32 const minMatch = (cParams->minMatch == 3) ? 3 : 4; + U32 nextToUpdate3 = ms->nextToUpdate; + + ZSTD_optimal_t* const opt = optStatePtr->priceTable; + ZSTD_match_t* const matches = optStatePtr->matchTable; + ZSTD_optimal_t lastSequence; + ZSTD_optLdm_t optLdm; + + optLdm.seqStore = ms->ldmSeqStore ? *ms->ldmSeqStore : kNullRawSeqStore; + optLdm.endPosInBlock = optLdm.startPosInBlock = optLdm.offset = 0; + ZSTD_opt_getNextMatchAndUpdateSeqStore(&optLdm, (U32)(ip-istart), (U32)(iend-ip)); + + /* init */ + DEBUGLOG(5, "ZSTD_compressBlock_opt_generic: current=%u, prefix=%u, nextToUpdate=%u", + (U32)(ip - base), ms->window.dictLimit, ms->nextToUpdate); + assert(optLevel <= 2); + ZSTD_rescaleFreqs(optStatePtr, (const BYTE*)src, srcSize, optLevel); + ip += (ip==prefixStart); + + /* Match Loop */ + while (ip < ilimit) { + U32 cur, last_pos = 0; + + /* find first match */ + { U32 const litlen = (U32)(ip - anchor); + U32 const ll0 = !litlen; + U32 nbMatches = ZSTD_BtGetAllMatches(matches, ms, &nextToUpdate3, ip, iend, dictMode, rep, ll0, minMatch); + ZSTD_optLdm_processMatchCandidate(&optLdm, matches, &nbMatches, + (U32)(ip-istart), (U32)(iend - ip)); + if (!nbMatches) { ip++; continue; } + + /* initialize opt[0] */ + { U32 i ; for (i=0; i immediate encoding */ + { U32 const maxML = matches[nbMatches-1].len; + U32 const maxOffset = matches[nbMatches-1].off; + DEBUGLOG(6, "found %u matches of maxLength=%u and maxOffCode=%u at cPos=%u => start new series", + nbMatches, maxML, maxOffset, (U32)(ip-prefixStart)); + + if (maxML > sufficient_len) { + lastSequence.litlen = litlen; + lastSequence.mlen = maxML; + lastSequence.off = maxOffset; + DEBUGLOG(6, "large match (%u>%u), immediate encoding", + maxML, sufficient_len); + cur = 0; + last_pos = ZSTD_totalLen(lastSequence); + goto _shortestPath; + } } + + /* set prices for first matches starting position == 0 */ + { U32 const literalsPrice = opt[0].price + ZSTD_litLengthPrice(0, optStatePtr, optLevel); + U32 pos; + U32 matchNb; + for (pos = 1; pos < minMatch; pos++) { + opt[pos].price = ZSTD_MAX_PRICE; /* mlen, litlen and price will be fixed during forward scanning */ + } + for (matchNb = 0; matchNb < nbMatches; matchNb++) { + U32 const offset = matches[matchNb].off; + U32 const end = matches[matchNb].len; + for ( ; pos <= end ; pos++ ) { + U32 const matchPrice = ZSTD_getMatchPrice(offset, pos, optStatePtr, optLevel); + U32 const sequencePrice = literalsPrice + matchPrice; + DEBUGLOG(7, "rPos:%u => set initial price : %.2f", + pos, ZSTD_fCost(sequencePrice)); + opt[pos].mlen = pos; + opt[pos].off = offset; + opt[pos].litlen = litlen; + opt[pos].price = sequencePrice; + } } + last_pos = pos-1; + } + } + + /* check further positions */ + for (cur = 1; cur <= last_pos; cur++) { + const BYTE* const inr = ip + cur; + assert(cur < ZSTD_OPT_NUM); + DEBUGLOG(7, "cPos:%zi==rPos:%u", inr-istart, cur) + + /* Fix current position with one literal if cheaper */ + { U32 const litlen = (opt[cur-1].mlen == 0) ? opt[cur-1].litlen + 1 : 1; + int const price = opt[cur-1].price + + ZSTD_rawLiteralsCost(ip+cur-1, 1, optStatePtr, optLevel) + + ZSTD_litLengthPrice(litlen, optStatePtr, optLevel) + - ZSTD_litLengthPrice(litlen-1, optStatePtr, optLevel); + assert(price < 1000000000); /* overflow check */ + if (price <= opt[cur].price) { + DEBUGLOG(7, "cPos:%zi==rPos:%u : better price (%.2f<=%.2f) using literal (ll==%u) (hist:%u,%u,%u)", + inr-istart, cur, ZSTD_fCost(price), ZSTD_fCost(opt[cur].price), litlen, + opt[cur-1].rep[0], opt[cur-1].rep[1], opt[cur-1].rep[2]); + opt[cur].mlen = 0; + opt[cur].off = 0; + opt[cur].litlen = litlen; + opt[cur].price = price; + } else { + DEBUGLOG(7, "cPos:%zi==rPos:%u : literal would cost more (%.2f>%.2f) (hist:%u,%u,%u)", + inr-istart, cur, ZSTD_fCost(price), ZSTD_fCost(opt[cur].price), + opt[cur].rep[0], opt[cur].rep[1], opt[cur].rep[2]); + } + } + + /* Set the repcodes of the current position. We must do it here + * because we rely on the repcodes of the 2nd to last sequence being + * correct to set the next chunks repcodes during the backward + * traversal. + */ + ZSTD_STATIC_ASSERT(sizeof(opt[cur].rep) == sizeof(repcodes_t)); + assert(cur >= opt[cur].mlen); + if (opt[cur].mlen != 0) { + U32 const prev = cur - opt[cur].mlen; + repcodes_t newReps = ZSTD_updateRep(opt[prev].rep, opt[cur].off, opt[cur].litlen==0); + ZSTD_memcpy(opt[cur].rep, &newReps, sizeof(repcodes_t)); + } else { + ZSTD_memcpy(opt[cur].rep, opt[cur - 1].rep, sizeof(repcodes_t)); + } + + /* last match must start at a minimum distance of 8 from oend */ + if (inr > ilimit) continue; + + if (cur == last_pos) break; + + if ( (optLevel==0) /*static_test*/ + && (opt[cur+1].price <= opt[cur].price + (BITCOST_MULTIPLIER/2)) ) { + DEBUGLOG(7, "move to next rPos:%u : price is <=", cur+1); + continue; /* skip unpromising positions; about ~+6% speed, -0.01 ratio */ + } + + { U32 const ll0 = (opt[cur].mlen != 0); + U32 const litlen = (opt[cur].mlen == 0) ? opt[cur].litlen : 0; + U32 const previousPrice = opt[cur].price; + U32 const basePrice = previousPrice + ZSTD_litLengthPrice(0, optStatePtr, optLevel); + U32 nbMatches = ZSTD_BtGetAllMatches(matches, ms, &nextToUpdate3, inr, iend, dictMode, opt[cur].rep, ll0, minMatch); + U32 matchNb; + + ZSTD_optLdm_processMatchCandidate(&optLdm, matches, &nbMatches, + (U32)(inr-istart), (U32)(iend-inr)); + + if (!nbMatches) { + DEBUGLOG(7, "rPos:%u : no match found", cur); + continue; + } + + { U32 const maxML = matches[nbMatches-1].len; + DEBUGLOG(7, "cPos:%zi==rPos:%u, found %u matches, of maxLength=%u", + inr-istart, cur, nbMatches, maxML); + + if ( (maxML > sufficient_len) + || (cur + maxML >= ZSTD_OPT_NUM) ) { + lastSequence.mlen = maxML; + lastSequence.off = matches[nbMatches-1].off; + lastSequence.litlen = litlen; + cur -= (opt[cur].mlen==0) ? opt[cur].litlen : 0; /* last sequence is actually only literals, fix cur to last match - note : may underflow, in which case, it's first sequence, and it's okay */ + last_pos = cur + ZSTD_totalLen(lastSequence); + if (cur > ZSTD_OPT_NUM) cur = 0; /* underflow => first match */ + goto _shortestPath; + } } + + /* set prices using matches found at position == cur */ + for (matchNb = 0; matchNb < nbMatches; matchNb++) { + U32 const offset = matches[matchNb].off; + U32 const lastML = matches[matchNb].len; + U32 const startML = (matchNb>0) ? matches[matchNb-1].len+1 : minMatch; + U32 mlen; + + DEBUGLOG(7, "testing match %u => offCode=%4u, mlen=%2u, llen=%2u", + matchNb, matches[matchNb].off, lastML, litlen); + + for (mlen = lastML; mlen >= startML; mlen--) { /* scan downward */ + U32 const pos = cur + mlen; + int const price = basePrice + ZSTD_getMatchPrice(offset, mlen, optStatePtr, optLevel); + + if ((pos > last_pos) || (price < opt[pos].price)) { + DEBUGLOG(7, "rPos:%u (ml=%2u) => new better price (%.2f<%.2f)", + pos, mlen, ZSTD_fCost(price), ZSTD_fCost(opt[pos].price)); + while (last_pos < pos) { opt[last_pos+1].price = ZSTD_MAX_PRICE; last_pos++; } /* fill empty positions */ + opt[pos].mlen = mlen; + opt[pos].off = offset; + opt[pos].litlen = litlen; + opt[pos].price = price; + } else { + DEBUGLOG(7, "rPos:%u (ml=%2u) => new price is worse (%.2f>=%.2f)", + pos, mlen, ZSTD_fCost(price), ZSTD_fCost(opt[pos].price)); + if (optLevel==0) break; /* early update abort; gets ~+10% speed for about -0.01 ratio loss */ + } + } } } + } /* for (cur = 1; cur <= last_pos; cur++) */ + + lastSequence = opt[last_pos]; + cur = last_pos > ZSTD_totalLen(lastSequence) ? last_pos - ZSTD_totalLen(lastSequence) : 0; /* single sequence, and it starts before `ip` */ + assert(cur < ZSTD_OPT_NUM); /* control overflow*/ + +_shortestPath: /* cur, last_pos, best_mlen, best_off have to be set */ + assert(opt[0].mlen == 0); + + /* Set the next chunk's repcodes based on the repcodes of the beginning + * of the last match, and the last sequence. This avoids us having to + * update them while traversing the sequences. + */ + if (lastSequence.mlen != 0) { + repcodes_t reps = ZSTD_updateRep(opt[cur].rep, lastSequence.off, lastSequence.litlen==0); + ZSTD_memcpy(rep, &reps, sizeof(reps)); + } else { + ZSTD_memcpy(rep, opt[cur].rep, sizeof(repcodes_t)); + } + + { U32 const storeEnd = cur + 1; + U32 storeStart = storeEnd; + U32 seqPos = cur; + + DEBUGLOG(6, "start reverse traversal (last_pos:%u, cur:%u)", + last_pos, cur); (void)last_pos; + assert(storeEnd < ZSTD_OPT_NUM); + DEBUGLOG(6, "last sequence copied into pos=%u (llen=%u,mlen=%u,ofc=%u)", + storeEnd, lastSequence.litlen, lastSequence.mlen, lastSequence.off); + opt[storeEnd] = lastSequence; + while (seqPos > 0) { + U32 const backDist = ZSTD_totalLen(opt[seqPos]); + storeStart--; + DEBUGLOG(6, "sequence from rPos=%u copied into pos=%u (llen=%u,mlen=%u,ofc=%u)", + seqPos, storeStart, opt[seqPos].litlen, opt[seqPos].mlen, opt[seqPos].off); + opt[storeStart] = opt[seqPos]; + seqPos = (seqPos > backDist) ? seqPos - backDist : 0; + } + + /* save sequences */ + DEBUGLOG(6, "sending selected sequences into seqStore") + { U32 storePos; + for (storePos=storeStart; storePos <= storeEnd; storePos++) { + U32 const llen = opt[storePos].litlen; + U32 const mlen = opt[storePos].mlen; + U32 const offCode = opt[storePos].off; + U32 const advance = llen + mlen; + DEBUGLOG(6, "considering seq starting at %zi, llen=%u, mlen=%u", + anchor - istart, (unsigned)llen, (unsigned)mlen); + + if (mlen==0) { /* only literals => must be last "sequence", actually starting a new stream of sequences */ + assert(storePos == storeEnd); /* must be last sequence */ + ip = anchor + llen; /* last "sequence" is a bunch of literals => don't progress anchor */ + continue; /* will finish */ + } + + assert(anchor + llen <= iend); + ZSTD_updateStats(optStatePtr, llen, anchor, offCode, mlen); + ZSTD_storeSeq(seqStore, llen, anchor, iend, offCode, mlen-MINMATCH); + anchor += advance; + ip = anchor; + } } + ZSTD_setBasePrices(optStatePtr, optLevel); + } + } /* while (ip < ilimit) */ + + /* Return the last literals size */ + return (size_t)(iend - anchor); +} + + +size_t ZSTD_compressBlock_btopt( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + const void* src, size_t srcSize) +{ + DEBUGLOG(5, "ZSTD_compressBlock_btopt"); + return ZSTD_compressBlock_opt_generic(ms, seqStore, rep, src, srcSize, 0 /*optLevel*/, ZSTD_noDict); +} + + +/* used in 2-pass strategy */ +static U32 ZSTD_upscaleStat(unsigned* table, U32 lastEltIndex, int bonus) +{ + U32 s, sum=0; + assert(ZSTD_FREQ_DIV+bonus >= 0); + for (s=0; slitSum = ZSTD_upscaleStat(optPtr->litFreq, MaxLit, 0); + optPtr->litLengthSum = ZSTD_upscaleStat(optPtr->litLengthFreq, MaxLL, 0); + optPtr->matchLengthSum = ZSTD_upscaleStat(optPtr->matchLengthFreq, MaxML, 0); + optPtr->offCodeSum = ZSTD_upscaleStat(optPtr->offCodeFreq, MaxOff, 0); +} + +/* ZSTD_initStats_ultra(): + * make a first compression pass, just to seed stats with more accurate starting values. + * only works on first block, with no dictionary and no ldm. + * this function cannot error, hence its contract must be respected. + */ +static void +ZSTD_initStats_ultra(ZSTD_matchState_t* ms, + seqStore_t* seqStore, + U32 rep[ZSTD_REP_NUM], + const void* src, size_t srcSize) +{ + U32 tmpRep[ZSTD_REP_NUM]; /* updated rep codes will sink here */ + ZSTD_memcpy(tmpRep, rep, sizeof(tmpRep)); + + DEBUGLOG(4, "ZSTD_initStats_ultra (srcSize=%zu)", srcSize); + assert(ms->opt.litLengthSum == 0); /* first block */ + assert(seqStore->sequences == seqStore->sequencesStart); /* no ldm */ + assert(ms->window.dictLimit == ms->window.lowLimit); /* no dictionary */ + assert(ms->window.dictLimit - ms->nextToUpdate <= 1); /* no prefix (note: intentional overflow, defined as 2-complement) */ + + ZSTD_compressBlock_opt_generic(ms, seqStore, tmpRep, src, srcSize, 2 /*optLevel*/, ZSTD_noDict); /* generate stats into ms->opt*/ + + /* invalidate first scan from history */ + ZSTD_resetSeqStore(seqStore); + ms->window.base -= srcSize; + ms->window.dictLimit += (U32)srcSize; + ms->window.lowLimit = ms->window.dictLimit; + ms->nextToUpdate = ms->window.dictLimit; + + /* re-inforce weight of collected statistics */ + ZSTD_upscaleStats(&ms->opt); +} + +size_t ZSTD_compressBlock_btultra( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + const void* src, size_t srcSize) +{ + DEBUGLOG(5, "ZSTD_compressBlock_btultra (srcSize=%zu)", srcSize); + return ZSTD_compressBlock_opt_generic(ms, seqStore, rep, src, srcSize, 2 /*optLevel*/, ZSTD_noDict); +} + +size_t ZSTD_compressBlock_btultra2( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + const void* src, size_t srcSize) +{ + U32 const curr = (U32)((const BYTE*)src - ms->window.base); + DEBUGLOG(5, "ZSTD_compressBlock_btultra2 (srcSize=%zu)", srcSize); + + /* 2-pass strategy: + * this strategy makes a first pass over first block to collect statistics + * and seed next round's statistics with it. + * After 1st pass, function forgets everything, and starts a new block. + * Consequently, this can only work if no data has been previously loaded in tables, + * aka, no dictionary, no prefix, no ldm preprocessing. + * The compression ratio gain is generally small (~0.5% on first block), + * the cost is 2x cpu time on first block. */ + assert(srcSize <= ZSTD_BLOCKSIZE_MAX); + if ( (ms->opt.litLengthSum==0) /* first block */ + && (seqStore->sequences == seqStore->sequencesStart) /* no ldm */ + && (ms->window.dictLimit == ms->window.lowLimit) /* no dictionary */ + && (curr == ms->window.dictLimit) /* start of frame, nothing already loaded nor skipped */ + && (srcSize > ZSTD_PREDEF_THRESHOLD) + ) { + ZSTD_initStats_ultra(ms, seqStore, rep, src, srcSize); + } + + return ZSTD_compressBlock_opt_generic(ms, seqStore, rep, src, srcSize, 2 /*optLevel*/, ZSTD_noDict); +} + +size_t ZSTD_compressBlock_btopt_dictMatchState( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + const void* src, size_t srcSize) +{ + return ZSTD_compressBlock_opt_generic(ms, seqStore, rep, src, srcSize, 0 /*optLevel*/, ZSTD_dictMatchState); +} + +size_t ZSTD_compressBlock_btultra_dictMatchState( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + const void* src, size_t srcSize) +{ + return ZSTD_compressBlock_opt_generic(ms, seqStore, rep, src, srcSize, 2 /*optLevel*/, ZSTD_dictMatchState); +} + +size_t ZSTD_compressBlock_btopt_extDict( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + const void* src, size_t srcSize) +{ + return ZSTD_compressBlock_opt_generic(ms, seqStore, rep, src, srcSize, 0 /*optLevel*/, ZSTD_extDict); +} + +size_t ZSTD_compressBlock_btultra_extDict( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + const void* src, size_t srcSize) +{ + return ZSTD_compressBlock_opt_generic(ms, seqStore, rep, src, srcSize, 2 /*optLevel*/, ZSTD_extDict); +} + +/* note : no btultra2 variant for extDict nor dictMatchState, + * because btultra2 is not meant to work with dictionaries + * and is only specific for the first block (no prefix) */ diff --git a/external/zstd/lib/compress/zstd_opt.h b/external/zstd/lib/compress/zstd_opt.h new file mode 100644 index 00000000..627255f5 --- /dev/null +++ b/external/zstd/lib/compress/zstd_opt.h @@ -0,0 +1,56 @@ +/* + * Copyright (c) Yann Collet, Facebook, Inc. + * All rights reserved. + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. + */ + +#ifndef ZSTD_OPT_H +#define ZSTD_OPT_H + +#if defined (__cplusplus) +extern "C" { +#endif + +#include "zstd_compress_internal.h" + +/* used in ZSTD_loadDictionaryContent() */ +void ZSTD_updateTree(ZSTD_matchState_t* ms, const BYTE* ip, const BYTE* iend); + +size_t ZSTD_compressBlock_btopt( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize); +size_t ZSTD_compressBlock_btultra( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize); +size_t ZSTD_compressBlock_btultra2( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize); + + +size_t ZSTD_compressBlock_btopt_dictMatchState( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize); +size_t ZSTD_compressBlock_btultra_dictMatchState( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize); + +size_t ZSTD_compressBlock_btopt_extDict( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize); +size_t ZSTD_compressBlock_btultra_extDict( + ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], + void const* src, size_t srcSize); + + /* note : no btultra2 variant for extDict nor dictMatchState, + * because btultra2 is not meant to work with dictionaries + * and is only specific for the first block (no prefix) */ + +#if defined (__cplusplus) +} +#endif + +#endif /* ZSTD_OPT_H */ diff --git a/external/zstd/lib/compress/zstdmt_compress.c b/external/zstd/lib/compress/zstdmt_compress.c new file mode 100644 index 00000000..22aa3e12 --- /dev/null +++ b/external/zstd/lib/compress/zstdmt_compress.c @@ -0,0 +1,1821 @@ +/* + * Copyright (c) Yann Collet, Facebook, Inc. + * All rights reserved. + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. + */ + + +/* ====== Compiler specifics ====== */ +#if defined(_MSC_VER) +# pragma warning(disable : 4204) /* disable: C4204: non-constant aggregate initializer */ +#endif + + +/* ====== Constants ====== */ +#define ZSTDMT_OVERLAPLOG_DEFAULT 0 + + +/* ====== Dependencies ====== */ +#include "../common/zstd_deps.h" /* ZSTD_memcpy, ZSTD_memset, INT_MAX, UINT_MAX */ +#include "../common/mem.h" /* MEM_STATIC */ +#include "../common/pool.h" /* threadpool */ +#include "../common/threading.h" /* mutex */ +#include "zstd_compress_internal.h" /* MIN, ERROR, ZSTD_*, ZSTD_highbit32 */ +#include "zstd_ldm.h" +#include "zstdmt_compress.h" + +/* Guards code to support resizing the SeqPool. + * We will want to resize the SeqPool to save memory in the future. + * Until then, comment the code out since it is unused. + */ +#define ZSTD_RESIZE_SEQPOOL 0 + +/* ====== Debug ====== */ +#if defined(DEBUGLEVEL) && (DEBUGLEVEL>=2) \ + && !defined(_MSC_VER) \ + && !defined(__MINGW32__) + +# include +# include +# include + +# define DEBUG_PRINTHEX(l,p,n) { \ + unsigned debug_u; \ + for (debug_u=0; debug_u<(n); debug_u++) \ + RAWLOG(l, "%02X ", ((const unsigned char*)(p))[debug_u]); \ + RAWLOG(l, " \n"); \ +} + +static unsigned long long GetCurrentClockTimeMicroseconds(void) +{ + static clock_t _ticksPerSecond = 0; + if (_ticksPerSecond <= 0) _ticksPerSecond = sysconf(_SC_CLK_TCK); + + { struct tms junk; clock_t newTicks = (clock_t) times(&junk); + return ((((unsigned long long)newTicks)*(1000000))/_ticksPerSecond); +} } + +#define MUTEX_WAIT_TIME_DLEVEL 6 +#define ZSTD_PTHREAD_MUTEX_LOCK(mutex) { \ + if (DEBUGLEVEL >= MUTEX_WAIT_TIME_DLEVEL) { \ + unsigned long long const beforeTime = GetCurrentClockTimeMicroseconds(); \ + ZSTD_pthread_mutex_lock(mutex); \ + { unsigned long long const afterTime = GetCurrentClockTimeMicroseconds(); \ + unsigned long long const elapsedTime = (afterTime-beforeTime); \ + if (elapsedTime > 1000) { /* or whatever threshold you like; I'm using 1 millisecond here */ \ + DEBUGLOG(MUTEX_WAIT_TIME_DLEVEL, "Thread took %llu microseconds to acquire mutex %s \n", \ + elapsedTime, #mutex); \ + } } \ + } else { \ + ZSTD_pthread_mutex_lock(mutex); \ + } \ +} + +#else + +# define ZSTD_PTHREAD_MUTEX_LOCK(m) ZSTD_pthread_mutex_lock(m) +# define DEBUG_PRINTHEX(l,p,n) {} + +#endif + + +/* ===== Buffer Pool ===== */ +/* a single Buffer Pool can be invoked from multiple threads in parallel */ + +typedef struct buffer_s { + void* start; + size_t capacity; +} buffer_t; + +static const buffer_t g_nullBuffer = { NULL, 0 }; + +typedef struct ZSTDMT_bufferPool_s { + ZSTD_pthread_mutex_t poolMutex; + size_t bufferSize; + unsigned totalBuffers; + unsigned nbBuffers; + ZSTD_customMem cMem; + buffer_t bTable[1]; /* variable size */ +} ZSTDMT_bufferPool; + +static ZSTDMT_bufferPool* ZSTDMT_createBufferPool(unsigned nbWorkers, ZSTD_customMem cMem) +{ + unsigned const maxNbBuffers = 2*nbWorkers + 3; + ZSTDMT_bufferPool* const bufPool = (ZSTDMT_bufferPool*)ZSTD_customCalloc( + sizeof(ZSTDMT_bufferPool) + (maxNbBuffers-1) * sizeof(buffer_t), cMem); + if (bufPool==NULL) return NULL; + if (ZSTD_pthread_mutex_init(&bufPool->poolMutex, NULL)) { + ZSTD_customFree(bufPool, cMem); + return NULL; + } + bufPool->bufferSize = 64 KB; + bufPool->totalBuffers = maxNbBuffers; + bufPool->nbBuffers = 0; + bufPool->cMem = cMem; + return bufPool; +} + +static void ZSTDMT_freeBufferPool(ZSTDMT_bufferPool* bufPool) +{ + unsigned u; + DEBUGLOG(3, "ZSTDMT_freeBufferPool (address:%08X)", (U32)(size_t)bufPool); + if (!bufPool) return; /* compatibility with free on NULL */ + for (u=0; utotalBuffers; u++) { + DEBUGLOG(4, "free buffer %2u (address:%08X)", u, (U32)(size_t)bufPool->bTable[u].start); + ZSTD_customFree(bufPool->bTable[u].start, bufPool->cMem); + } + ZSTD_pthread_mutex_destroy(&bufPool->poolMutex); + ZSTD_customFree(bufPool, bufPool->cMem); +} + +/* only works at initialization, not during compression */ +static size_t ZSTDMT_sizeof_bufferPool(ZSTDMT_bufferPool* bufPool) +{ + size_t const poolSize = sizeof(*bufPool) + + (bufPool->totalBuffers - 1) * sizeof(buffer_t); + unsigned u; + size_t totalBufferSize = 0; + ZSTD_pthread_mutex_lock(&bufPool->poolMutex); + for (u=0; utotalBuffers; u++) + totalBufferSize += bufPool->bTable[u].capacity; + ZSTD_pthread_mutex_unlock(&bufPool->poolMutex); + + return poolSize + totalBufferSize; +} + +/* ZSTDMT_setBufferSize() : + * all future buffers provided by this buffer pool will have _at least_ this size + * note : it's better for all buffers to have same size, + * as they become freely interchangeable, reducing malloc/free usages and memory fragmentation */ +static void ZSTDMT_setBufferSize(ZSTDMT_bufferPool* const bufPool, size_t const bSize) +{ + ZSTD_pthread_mutex_lock(&bufPool->poolMutex); + DEBUGLOG(4, "ZSTDMT_setBufferSize: bSize = %u", (U32)bSize); + bufPool->bufferSize = bSize; + ZSTD_pthread_mutex_unlock(&bufPool->poolMutex); +} + + +static ZSTDMT_bufferPool* ZSTDMT_expandBufferPool(ZSTDMT_bufferPool* srcBufPool, U32 nbWorkers) +{ + unsigned const maxNbBuffers = 2*nbWorkers + 3; + if (srcBufPool==NULL) return NULL; + if (srcBufPool->totalBuffers >= maxNbBuffers) /* good enough */ + return srcBufPool; + /* need a larger buffer pool */ + { ZSTD_customMem const cMem = srcBufPool->cMem; + size_t const bSize = srcBufPool->bufferSize; /* forward parameters */ + ZSTDMT_bufferPool* newBufPool; + ZSTDMT_freeBufferPool(srcBufPool); + newBufPool = ZSTDMT_createBufferPool(nbWorkers, cMem); + if (newBufPool==NULL) return newBufPool; + ZSTDMT_setBufferSize(newBufPool, bSize); + return newBufPool; + } +} + +/** ZSTDMT_getBuffer() : + * assumption : bufPool must be valid + * @return : a buffer, with start pointer and size + * note: allocation may fail, in this case, start==NULL and size==0 */ +static buffer_t ZSTDMT_getBuffer(ZSTDMT_bufferPool* bufPool) +{ + size_t const bSize = bufPool->bufferSize; + DEBUGLOG(5, "ZSTDMT_getBuffer: bSize = %u", (U32)bufPool->bufferSize); + ZSTD_pthread_mutex_lock(&bufPool->poolMutex); + if (bufPool->nbBuffers) { /* try to use an existing buffer */ + buffer_t const buf = bufPool->bTable[--(bufPool->nbBuffers)]; + size_t const availBufferSize = buf.capacity; + bufPool->bTable[bufPool->nbBuffers] = g_nullBuffer; + if ((availBufferSize >= bSize) & ((availBufferSize>>3) <= bSize)) { + /* large enough, but not too much */ + DEBUGLOG(5, "ZSTDMT_getBuffer: provide buffer %u of size %u", + bufPool->nbBuffers, (U32)buf.capacity); + ZSTD_pthread_mutex_unlock(&bufPool->poolMutex); + return buf; + } + /* size conditions not respected : scratch this buffer, create new one */ + DEBUGLOG(5, "ZSTDMT_getBuffer: existing buffer does not meet size conditions => freeing"); + ZSTD_customFree(buf.start, bufPool->cMem); + } + ZSTD_pthread_mutex_unlock(&bufPool->poolMutex); + /* create new buffer */ + DEBUGLOG(5, "ZSTDMT_getBuffer: create a new buffer"); + { buffer_t buffer; + void* const start = ZSTD_customMalloc(bSize, bufPool->cMem); + buffer.start = start; /* note : start can be NULL if malloc fails ! */ + buffer.capacity = (start==NULL) ? 0 : bSize; + if (start==NULL) { + DEBUGLOG(5, "ZSTDMT_getBuffer: buffer allocation failure !!"); + } else { + DEBUGLOG(5, "ZSTDMT_getBuffer: created buffer of size %u", (U32)bSize); + } + return buffer; + } +} + +#if ZSTD_RESIZE_SEQPOOL +/** ZSTDMT_resizeBuffer() : + * assumption : bufPool must be valid + * @return : a buffer that is at least the buffer pool buffer size. + * If a reallocation happens, the data in the input buffer is copied. + */ +static buffer_t ZSTDMT_resizeBuffer(ZSTDMT_bufferPool* bufPool, buffer_t buffer) +{ + size_t const bSize = bufPool->bufferSize; + if (buffer.capacity < bSize) { + void* const start = ZSTD_customMalloc(bSize, bufPool->cMem); + buffer_t newBuffer; + newBuffer.start = start; + newBuffer.capacity = start == NULL ? 0 : bSize; + if (start != NULL) { + assert(newBuffer.capacity >= buffer.capacity); + ZSTD_memcpy(newBuffer.start, buffer.start, buffer.capacity); + DEBUGLOG(5, "ZSTDMT_resizeBuffer: created buffer of size %u", (U32)bSize); + return newBuffer; + } + DEBUGLOG(5, "ZSTDMT_resizeBuffer: buffer allocation failure !!"); + } + return buffer; +} +#endif + +/* store buffer for later re-use, up to pool capacity */ +static void ZSTDMT_releaseBuffer(ZSTDMT_bufferPool* bufPool, buffer_t buf) +{ + DEBUGLOG(5, "ZSTDMT_releaseBuffer"); + if (buf.start == NULL) return; /* compatible with release on NULL */ + ZSTD_pthread_mutex_lock(&bufPool->poolMutex); + if (bufPool->nbBuffers < bufPool->totalBuffers) { + bufPool->bTable[bufPool->nbBuffers++] = buf; /* stored for later use */ + DEBUGLOG(5, "ZSTDMT_releaseBuffer: stored buffer of size %u in slot %u", + (U32)buf.capacity, (U32)(bufPool->nbBuffers-1)); + ZSTD_pthread_mutex_unlock(&bufPool->poolMutex); + return; + } + ZSTD_pthread_mutex_unlock(&bufPool->poolMutex); + /* Reached bufferPool capacity (should not happen) */ + DEBUGLOG(5, "ZSTDMT_releaseBuffer: pool capacity reached => freeing "); + ZSTD_customFree(buf.start, bufPool->cMem); +} + + +/* ===== Seq Pool Wrapper ====== */ + +typedef ZSTDMT_bufferPool ZSTDMT_seqPool; + +static size_t ZSTDMT_sizeof_seqPool(ZSTDMT_seqPool* seqPool) +{ + return ZSTDMT_sizeof_bufferPool(seqPool); +} + +static rawSeqStore_t bufferToSeq(buffer_t buffer) +{ + rawSeqStore_t seq = kNullRawSeqStore; + seq.seq = (rawSeq*)buffer.start; + seq.capacity = buffer.capacity / sizeof(rawSeq); + return seq; +} + +static buffer_t seqToBuffer(rawSeqStore_t seq) +{ + buffer_t buffer; + buffer.start = seq.seq; + buffer.capacity = seq.capacity * sizeof(rawSeq); + return buffer; +} + +static rawSeqStore_t ZSTDMT_getSeq(ZSTDMT_seqPool* seqPool) +{ + if (seqPool->bufferSize == 0) { + return kNullRawSeqStore; + } + return bufferToSeq(ZSTDMT_getBuffer(seqPool)); +} + +#if ZSTD_RESIZE_SEQPOOL +static rawSeqStore_t ZSTDMT_resizeSeq(ZSTDMT_seqPool* seqPool, rawSeqStore_t seq) +{ + return bufferToSeq(ZSTDMT_resizeBuffer(seqPool, seqToBuffer(seq))); +} +#endif + +static void ZSTDMT_releaseSeq(ZSTDMT_seqPool* seqPool, rawSeqStore_t seq) +{ + ZSTDMT_releaseBuffer(seqPool, seqToBuffer(seq)); +} + +static void ZSTDMT_setNbSeq(ZSTDMT_seqPool* const seqPool, size_t const nbSeq) +{ + ZSTDMT_setBufferSize(seqPool, nbSeq * sizeof(rawSeq)); +} + +static ZSTDMT_seqPool* ZSTDMT_createSeqPool(unsigned nbWorkers, ZSTD_customMem cMem) +{ + ZSTDMT_seqPool* const seqPool = ZSTDMT_createBufferPool(nbWorkers, cMem); + if (seqPool == NULL) return NULL; + ZSTDMT_setNbSeq(seqPool, 0); + return seqPool; +} + +static void ZSTDMT_freeSeqPool(ZSTDMT_seqPool* seqPool) +{ + ZSTDMT_freeBufferPool(seqPool); +} + +static ZSTDMT_seqPool* ZSTDMT_expandSeqPool(ZSTDMT_seqPool* pool, U32 nbWorkers) +{ + return ZSTDMT_expandBufferPool(pool, nbWorkers); +} + + +/* ===== CCtx Pool ===== */ +/* a single CCtx Pool can be invoked from multiple threads in parallel */ + +typedef struct { + ZSTD_pthread_mutex_t poolMutex; + int totalCCtx; + int availCCtx; + ZSTD_customMem cMem; + ZSTD_CCtx* cctx[1]; /* variable size */ +} ZSTDMT_CCtxPool; + +/* note : all CCtx borrowed from the pool should be released back to the pool _before_ freeing the pool */ +static void ZSTDMT_freeCCtxPool(ZSTDMT_CCtxPool* pool) +{ + int cid; + for (cid=0; cidtotalCCtx; cid++) + ZSTD_freeCCtx(pool->cctx[cid]); /* note : compatible with free on NULL */ + ZSTD_pthread_mutex_destroy(&pool->poolMutex); + ZSTD_customFree(pool, pool->cMem); +} + +/* ZSTDMT_createCCtxPool() : + * implies nbWorkers >= 1 , checked by caller ZSTDMT_createCCtx() */ +static ZSTDMT_CCtxPool* ZSTDMT_createCCtxPool(int nbWorkers, + ZSTD_customMem cMem) +{ + ZSTDMT_CCtxPool* const cctxPool = (ZSTDMT_CCtxPool*) ZSTD_customCalloc( + sizeof(ZSTDMT_CCtxPool) + (nbWorkers-1)*sizeof(ZSTD_CCtx*), cMem); + assert(nbWorkers > 0); + if (!cctxPool) return NULL; + if (ZSTD_pthread_mutex_init(&cctxPool->poolMutex, NULL)) { + ZSTD_customFree(cctxPool, cMem); + return NULL; + } + cctxPool->cMem = cMem; + cctxPool->totalCCtx = nbWorkers; + cctxPool->availCCtx = 1; /* at least one cctx for single-thread mode */ + cctxPool->cctx[0] = ZSTD_createCCtx_advanced(cMem); + if (!cctxPool->cctx[0]) { ZSTDMT_freeCCtxPool(cctxPool); return NULL; } + DEBUGLOG(3, "cctxPool created, with %u workers", nbWorkers); + return cctxPool; +} + +static ZSTDMT_CCtxPool* ZSTDMT_expandCCtxPool(ZSTDMT_CCtxPool* srcPool, + int nbWorkers) +{ + if (srcPool==NULL) return NULL; + if (nbWorkers <= srcPool->totalCCtx) return srcPool; /* good enough */ + /* need a larger cctx pool */ + { ZSTD_customMem const cMem = srcPool->cMem; + ZSTDMT_freeCCtxPool(srcPool); + return ZSTDMT_createCCtxPool(nbWorkers, cMem); + } +} + +/* only works during initialization phase, not during compression */ +static size_t ZSTDMT_sizeof_CCtxPool(ZSTDMT_CCtxPool* cctxPool) +{ + ZSTD_pthread_mutex_lock(&cctxPool->poolMutex); + { unsigned const nbWorkers = cctxPool->totalCCtx; + size_t const poolSize = sizeof(*cctxPool) + + (nbWorkers-1) * sizeof(ZSTD_CCtx*); + unsigned u; + size_t totalCCtxSize = 0; + for (u=0; ucctx[u]); + } + ZSTD_pthread_mutex_unlock(&cctxPool->poolMutex); + assert(nbWorkers > 0); + return poolSize + totalCCtxSize; + } +} + +static ZSTD_CCtx* ZSTDMT_getCCtx(ZSTDMT_CCtxPool* cctxPool) +{ + DEBUGLOG(5, "ZSTDMT_getCCtx"); + ZSTD_pthread_mutex_lock(&cctxPool->poolMutex); + if (cctxPool->availCCtx) { + cctxPool->availCCtx--; + { ZSTD_CCtx* const cctx = cctxPool->cctx[cctxPool->availCCtx]; + ZSTD_pthread_mutex_unlock(&cctxPool->poolMutex); + return cctx; + } } + ZSTD_pthread_mutex_unlock(&cctxPool->poolMutex); + DEBUGLOG(5, "create one more CCtx"); + return ZSTD_createCCtx_advanced(cctxPool->cMem); /* note : can be NULL, when creation fails ! */ +} + +static void ZSTDMT_releaseCCtx(ZSTDMT_CCtxPool* pool, ZSTD_CCtx* cctx) +{ + if (cctx==NULL) return; /* compatibility with release on NULL */ + ZSTD_pthread_mutex_lock(&pool->poolMutex); + if (pool->availCCtx < pool->totalCCtx) + pool->cctx[pool->availCCtx++] = cctx; + else { + /* pool overflow : should not happen, since totalCCtx==nbWorkers */ + DEBUGLOG(4, "CCtx pool overflow : free cctx"); + ZSTD_freeCCtx(cctx); + } + ZSTD_pthread_mutex_unlock(&pool->poolMutex); +} + +/* ==== Serial State ==== */ + +typedef struct { + void const* start; + size_t size; +} range_t; + +typedef struct { + /* All variables in the struct are protected by mutex. */ + ZSTD_pthread_mutex_t mutex; + ZSTD_pthread_cond_t cond; + ZSTD_CCtx_params params; + ldmState_t ldmState; + XXH64_state_t xxhState; + unsigned nextJobID; + /* Protects ldmWindow. + * Must be acquired after the main mutex when acquiring both. + */ + ZSTD_pthread_mutex_t ldmWindowMutex; + ZSTD_pthread_cond_t ldmWindowCond; /* Signaled when ldmWindow is updated */ + ZSTD_window_t ldmWindow; /* A thread-safe copy of ldmState.window */ +} serialState_t; + +static int +ZSTDMT_serialState_reset(serialState_t* serialState, + ZSTDMT_seqPool* seqPool, + ZSTD_CCtx_params params, + size_t jobSize, + const void* dict, size_t const dictSize, + ZSTD_dictContentType_e dictContentType) +{ + /* Adjust parameters */ + if (params.ldmParams.enableLdm) { + DEBUGLOG(4, "LDM window size = %u KB", (1U << params.cParams.windowLog) >> 10); + ZSTD_ldm_adjustParameters(¶ms.ldmParams, ¶ms.cParams); + assert(params.ldmParams.hashLog >= params.ldmParams.bucketSizeLog); + assert(params.ldmParams.hashRateLog < 32); + } else { + ZSTD_memset(¶ms.ldmParams, 0, sizeof(params.ldmParams)); + } + serialState->nextJobID = 0; + if (params.fParams.checksumFlag) + XXH64_reset(&serialState->xxhState, 0); + if (params.ldmParams.enableLdm) { + ZSTD_customMem cMem = params.customMem; + unsigned const hashLog = params.ldmParams.hashLog; + size_t const hashSize = ((size_t)1 << hashLog) * sizeof(ldmEntry_t); + unsigned const bucketLog = + params.ldmParams.hashLog - params.ldmParams.bucketSizeLog; + unsigned const prevBucketLog = + serialState->params.ldmParams.hashLog - + serialState->params.ldmParams.bucketSizeLog; + size_t const numBuckets = (size_t)1 << bucketLog; + /* Size the seq pool tables */ + ZSTDMT_setNbSeq(seqPool, ZSTD_ldm_getMaxNbSeq(params.ldmParams, jobSize)); + /* Reset the window */ + ZSTD_window_init(&serialState->ldmState.window); + /* Resize tables and output space if necessary. */ + if (serialState->ldmState.hashTable == NULL || serialState->params.ldmParams.hashLog < hashLog) { + ZSTD_customFree(serialState->ldmState.hashTable, cMem); + serialState->ldmState.hashTable = (ldmEntry_t*)ZSTD_customMalloc(hashSize, cMem); + } + if (serialState->ldmState.bucketOffsets == NULL || prevBucketLog < bucketLog) { + ZSTD_customFree(serialState->ldmState.bucketOffsets, cMem); + serialState->ldmState.bucketOffsets = (BYTE*)ZSTD_customMalloc(numBuckets, cMem); + } + if (!serialState->ldmState.hashTable || !serialState->ldmState.bucketOffsets) + return 1; + /* Zero the tables */ + ZSTD_memset(serialState->ldmState.hashTable, 0, hashSize); + ZSTD_memset(serialState->ldmState.bucketOffsets, 0, numBuckets); + + /* Update window state and fill hash table with dict */ + serialState->ldmState.loadedDictEnd = 0; + if (dictSize > 0) { + if (dictContentType == ZSTD_dct_rawContent) { + BYTE const* const dictEnd = (const BYTE*)dict + dictSize; + ZSTD_window_update(&serialState->ldmState.window, dict, dictSize, /* forceNonContiguous */ 0); + ZSTD_ldm_fillHashTable(&serialState->ldmState, (const BYTE*)dict, dictEnd, ¶ms.ldmParams); + serialState->ldmState.loadedDictEnd = params.forceWindow ? 0 : (U32)(dictEnd - serialState->ldmState.window.base); + } else { + /* don't even load anything */ + } + } + + /* Initialize serialState's copy of ldmWindow. */ + serialState->ldmWindow = serialState->ldmState.window; + } + + serialState->params = params; + serialState->params.jobSize = (U32)jobSize; + return 0; +} + +static int ZSTDMT_serialState_init(serialState_t* serialState) +{ + int initError = 0; + ZSTD_memset(serialState, 0, sizeof(*serialState)); + initError |= ZSTD_pthread_mutex_init(&serialState->mutex, NULL); + initError |= ZSTD_pthread_cond_init(&serialState->cond, NULL); + initError |= ZSTD_pthread_mutex_init(&serialState->ldmWindowMutex, NULL); + initError |= ZSTD_pthread_cond_init(&serialState->ldmWindowCond, NULL); + return initError; +} + +static void ZSTDMT_serialState_free(serialState_t* serialState) +{ + ZSTD_customMem cMem = serialState->params.customMem; + ZSTD_pthread_mutex_destroy(&serialState->mutex); + ZSTD_pthread_cond_destroy(&serialState->cond); + ZSTD_pthread_mutex_destroy(&serialState->ldmWindowMutex); + ZSTD_pthread_cond_destroy(&serialState->ldmWindowCond); + ZSTD_customFree(serialState->ldmState.hashTable, cMem); + ZSTD_customFree(serialState->ldmState.bucketOffsets, cMem); +} + +static void ZSTDMT_serialState_update(serialState_t* serialState, + ZSTD_CCtx* jobCCtx, rawSeqStore_t seqStore, + range_t src, unsigned jobID) +{ + /* Wait for our turn */ + ZSTD_PTHREAD_MUTEX_LOCK(&serialState->mutex); + while (serialState->nextJobID < jobID) { + DEBUGLOG(5, "wait for serialState->cond"); + ZSTD_pthread_cond_wait(&serialState->cond, &serialState->mutex); + } + /* A future job may error and skip our job */ + if (serialState->nextJobID == jobID) { + /* It is now our turn, do any processing necessary */ + if (serialState->params.ldmParams.enableLdm) { + size_t error; + assert(seqStore.seq != NULL && seqStore.pos == 0 && + seqStore.size == 0 && seqStore.capacity > 0); + assert(src.size <= serialState->params.jobSize); + ZSTD_window_update(&serialState->ldmState.window, src.start, src.size, /* forceNonContiguous */ 0); + error = ZSTD_ldm_generateSequences( + &serialState->ldmState, &seqStore, + &serialState->params.ldmParams, src.start, src.size); + /* We provide a large enough buffer to never fail. */ + assert(!ZSTD_isError(error)); (void)error; + /* Update ldmWindow to match the ldmState.window and signal the main + * thread if it is waiting for a buffer. + */ + ZSTD_PTHREAD_MUTEX_LOCK(&serialState->ldmWindowMutex); + serialState->ldmWindow = serialState->ldmState.window; + ZSTD_pthread_cond_signal(&serialState->ldmWindowCond); + ZSTD_pthread_mutex_unlock(&serialState->ldmWindowMutex); + } + if (serialState->params.fParams.checksumFlag && src.size > 0) + XXH64_update(&serialState->xxhState, src.start, src.size); + } + /* Now it is the next jobs turn */ + serialState->nextJobID++; + ZSTD_pthread_cond_broadcast(&serialState->cond); + ZSTD_pthread_mutex_unlock(&serialState->mutex); + + if (seqStore.size > 0) { + size_t const err = ZSTD_referenceExternalSequences( + jobCCtx, seqStore.seq, seqStore.size); + assert(serialState->params.ldmParams.enableLdm); + assert(!ZSTD_isError(err)); + (void)err; + } +} + +static void ZSTDMT_serialState_ensureFinished(serialState_t* serialState, + unsigned jobID, size_t cSize) +{ + ZSTD_PTHREAD_MUTEX_LOCK(&serialState->mutex); + if (serialState->nextJobID <= jobID) { + assert(ZSTD_isError(cSize)); (void)cSize; + DEBUGLOG(5, "Skipping past job %u because of error", jobID); + serialState->nextJobID = jobID + 1; + ZSTD_pthread_cond_broadcast(&serialState->cond); + + ZSTD_PTHREAD_MUTEX_LOCK(&serialState->ldmWindowMutex); + ZSTD_window_clear(&serialState->ldmWindow); + ZSTD_pthread_cond_signal(&serialState->ldmWindowCond); + ZSTD_pthread_mutex_unlock(&serialState->ldmWindowMutex); + } + ZSTD_pthread_mutex_unlock(&serialState->mutex); + +} + + +/* ------------------------------------------ */ +/* ===== Worker thread ===== */ +/* ------------------------------------------ */ + +static const range_t kNullRange = { NULL, 0 }; + +typedef struct { + size_t consumed; /* SHARED - set0 by mtctx, then modified by worker AND read by mtctx */ + size_t cSize; /* SHARED - set0 by mtctx, then modified by worker AND read by mtctx, then set0 by mtctx */ + ZSTD_pthread_mutex_t job_mutex; /* Thread-safe - used by mtctx and worker */ + ZSTD_pthread_cond_t job_cond; /* Thread-safe - used by mtctx and worker */ + ZSTDMT_CCtxPool* cctxPool; /* Thread-safe - used by mtctx and (all) workers */ + ZSTDMT_bufferPool* bufPool; /* Thread-safe - used by mtctx and (all) workers */ + ZSTDMT_seqPool* seqPool; /* Thread-safe - used by mtctx and (all) workers */ + serialState_t* serial; /* Thread-safe - used by mtctx and (all) workers */ + buffer_t dstBuff; /* set by worker (or mtctx), then read by worker & mtctx, then modified by mtctx => no barrier */ + range_t prefix; /* set by mtctx, then read by worker & mtctx => no barrier */ + range_t src; /* set by mtctx, then read by worker & mtctx => no barrier */ + unsigned jobID; /* set by mtctx, then read by worker => no barrier */ + unsigned firstJob; /* set by mtctx, then read by worker => no barrier */ + unsigned lastJob; /* set by mtctx, then read by worker => no barrier */ + ZSTD_CCtx_params params; /* set by mtctx, then read by worker => no barrier */ + const ZSTD_CDict* cdict; /* set by mtctx, then read by worker => no barrier */ + unsigned long long fullFrameSize; /* set by mtctx, then read by worker => no barrier */ + size_t dstFlushed; /* used only by mtctx */ + unsigned frameChecksumNeeded; /* used only by mtctx */ +} ZSTDMT_jobDescription; + +#define JOB_ERROR(e) { \ + ZSTD_PTHREAD_MUTEX_LOCK(&job->job_mutex); \ + job->cSize = e; \ + ZSTD_pthread_mutex_unlock(&job->job_mutex); \ + goto _endJob; \ +} + +/* ZSTDMT_compressionJob() is a POOL_function type */ +static void ZSTDMT_compressionJob(void* jobDescription) +{ + ZSTDMT_jobDescription* const job = (ZSTDMT_jobDescription*)jobDescription; + ZSTD_CCtx_params jobParams = job->params; /* do not modify job->params ! copy it, modify the copy */ + ZSTD_CCtx* const cctx = ZSTDMT_getCCtx(job->cctxPool); + rawSeqStore_t rawSeqStore = ZSTDMT_getSeq(job->seqPool); + buffer_t dstBuff = job->dstBuff; + size_t lastCBlockSize = 0; + + /* resources */ + if (cctx==NULL) JOB_ERROR(ERROR(memory_allocation)); + if (dstBuff.start == NULL) { /* streaming job : doesn't provide a dstBuffer */ + dstBuff = ZSTDMT_getBuffer(job->bufPool); + if (dstBuff.start==NULL) JOB_ERROR(ERROR(memory_allocation)); + job->dstBuff = dstBuff; /* this value can be read in ZSTDMT_flush, when it copies the whole job */ + } + if (jobParams.ldmParams.enableLdm && rawSeqStore.seq == NULL) + JOB_ERROR(ERROR(memory_allocation)); + + /* Don't compute the checksum for chunks, since we compute it externally, + * but write it in the header. + */ + if (job->jobID != 0) jobParams.fParams.checksumFlag = 0; + /* Don't run LDM for the chunks, since we handle it externally */ + jobParams.ldmParams.enableLdm = 0; + /* Correct nbWorkers to 0. */ + jobParams.nbWorkers = 0; + + + /* init */ + if (job->cdict) { + size_t const initError = ZSTD_compressBegin_advanced_internal(cctx, NULL, 0, ZSTD_dct_auto, ZSTD_dtlm_fast, job->cdict, &jobParams, job->fullFrameSize); + assert(job->firstJob); /* only allowed for first job */ + if (ZSTD_isError(initError)) JOB_ERROR(initError); + } else { /* srcStart points at reloaded section */ + U64 const pledgedSrcSize = job->firstJob ? job->fullFrameSize : job->src.size; + { size_t const forceWindowError = ZSTD_CCtxParams_setParameter(&jobParams, ZSTD_c_forceMaxWindow, !job->firstJob); + if (ZSTD_isError(forceWindowError)) JOB_ERROR(forceWindowError); + } + if (!job->firstJob) { + size_t const err = ZSTD_CCtxParams_setParameter(&jobParams, ZSTD_c_deterministicRefPrefix, 0); + if (ZSTD_isError(err)) JOB_ERROR(err); + } + { size_t const initError = ZSTD_compressBegin_advanced_internal(cctx, + job->prefix.start, job->prefix.size, ZSTD_dct_rawContent, /* load dictionary in "content-only" mode (no header analysis) */ + ZSTD_dtlm_fast, + NULL, /*cdict*/ + &jobParams, pledgedSrcSize); + if (ZSTD_isError(initError)) JOB_ERROR(initError); + } } + + /* Perform serial step as early as possible, but after CCtx initialization */ + ZSTDMT_serialState_update(job->serial, cctx, rawSeqStore, job->src, job->jobID); + + if (!job->firstJob) { /* flush and overwrite frame header when it's not first job */ + size_t const hSize = ZSTD_compressContinue(cctx, dstBuff.start, dstBuff.capacity, job->src.start, 0); + if (ZSTD_isError(hSize)) JOB_ERROR(hSize); + DEBUGLOG(5, "ZSTDMT_compressionJob: flush and overwrite %u bytes of frame header (not first job)", (U32)hSize); + ZSTD_invalidateRepCodes(cctx); + } + + /* compress */ + { size_t const chunkSize = 4*ZSTD_BLOCKSIZE_MAX; + int const nbChunks = (int)((job->src.size + (chunkSize-1)) / chunkSize); + const BYTE* ip = (const BYTE*) job->src.start; + BYTE* const ostart = (BYTE*)dstBuff.start; + BYTE* op = ostart; + BYTE* oend = op + dstBuff.capacity; + int chunkNb; + if (sizeof(size_t) > sizeof(int)) assert(job->src.size < ((size_t)INT_MAX) * chunkSize); /* check overflow */ + DEBUGLOG(5, "ZSTDMT_compressionJob: compress %u bytes in %i blocks", (U32)job->src.size, nbChunks); + assert(job->cSize == 0); + for (chunkNb = 1; chunkNb < nbChunks; chunkNb++) { + size_t const cSize = ZSTD_compressContinue(cctx, op, oend-op, ip, chunkSize); + if (ZSTD_isError(cSize)) JOB_ERROR(cSize); + ip += chunkSize; + op += cSize; assert(op < oend); + /* stats */ + ZSTD_PTHREAD_MUTEX_LOCK(&job->job_mutex); + job->cSize += cSize; + job->consumed = chunkSize * chunkNb; + DEBUGLOG(5, "ZSTDMT_compressionJob: compress new block : cSize==%u bytes (total: %u)", + (U32)cSize, (U32)job->cSize); + ZSTD_pthread_cond_signal(&job->job_cond); /* warns some more data is ready to be flushed */ + ZSTD_pthread_mutex_unlock(&job->job_mutex); + } + /* last block */ + assert(chunkSize > 0); + assert((chunkSize & (chunkSize - 1)) == 0); /* chunkSize must be power of 2 for mask==(chunkSize-1) to work */ + if ((nbChunks > 0) | job->lastJob /*must output a "last block" flag*/ ) { + size_t const lastBlockSize1 = job->src.size & (chunkSize-1); + size_t const lastBlockSize = ((lastBlockSize1==0) & (job->src.size>=chunkSize)) ? chunkSize : lastBlockSize1; + size_t const cSize = (job->lastJob) ? + ZSTD_compressEnd (cctx, op, oend-op, ip, lastBlockSize) : + ZSTD_compressContinue(cctx, op, oend-op, ip, lastBlockSize); + if (ZSTD_isError(cSize)) JOB_ERROR(cSize); + lastCBlockSize = cSize; + } } + if (!job->firstJob) { + /* Double check that we don't have an ext-dict, because then our + * repcode invalidation doesn't work. + */ + assert(!ZSTD_window_hasExtDict(cctx->blockState.matchState.window)); + } + ZSTD_CCtx_trace(cctx, 0); + +_endJob: + ZSTDMT_serialState_ensureFinished(job->serial, job->jobID, job->cSize); + if (job->prefix.size > 0) + DEBUGLOG(5, "Finished with prefix: %zx", (size_t)job->prefix.start); + DEBUGLOG(5, "Finished with source: %zx", (size_t)job->src.start); + /* release resources */ + ZSTDMT_releaseSeq(job->seqPool, rawSeqStore); + ZSTDMT_releaseCCtx(job->cctxPool, cctx); + /* report */ + ZSTD_PTHREAD_MUTEX_LOCK(&job->job_mutex); + if (ZSTD_isError(job->cSize)) assert(lastCBlockSize == 0); + job->cSize += lastCBlockSize; + job->consumed = job->src.size; /* when job->consumed == job->src.size , compression job is presumed completed */ + ZSTD_pthread_cond_signal(&job->job_cond); + ZSTD_pthread_mutex_unlock(&job->job_mutex); +} + + +/* ------------------------------------------ */ +/* ===== Multi-threaded compression ===== */ +/* ------------------------------------------ */ + +typedef struct { + range_t prefix; /* read-only non-owned prefix buffer */ + buffer_t buffer; + size_t filled; +} inBuff_t; + +typedef struct { + BYTE* buffer; /* The round input buffer. All jobs get references + * to pieces of the buffer. ZSTDMT_tryGetInputRange() + * handles handing out job input buffers, and makes + * sure it doesn't overlap with any pieces still in use. + */ + size_t capacity; /* The capacity of buffer. */ + size_t pos; /* The position of the current inBuff in the round + * buffer. Updated past the end if the inBuff once + * the inBuff is sent to the worker thread. + * pos <= capacity. + */ +} roundBuff_t; + +static const roundBuff_t kNullRoundBuff = {NULL, 0, 0}; + +#define RSYNC_LENGTH 32 + +typedef struct { + U64 hash; + U64 hitMask; + U64 primePower; +} rsyncState_t; + +struct ZSTDMT_CCtx_s { + POOL_ctx* factory; + ZSTDMT_jobDescription* jobs; + ZSTDMT_bufferPool* bufPool; + ZSTDMT_CCtxPool* cctxPool; + ZSTDMT_seqPool* seqPool; + ZSTD_CCtx_params params; + size_t targetSectionSize; + size_t targetPrefixSize; + int jobReady; /* 1 => one job is already prepared, but pool has shortage of workers. Don't create a new job. */ + inBuff_t inBuff; + roundBuff_t roundBuff; + serialState_t serial; + rsyncState_t rsync; + unsigned jobIDMask; + unsigned doneJobID; + unsigned nextJobID; + unsigned frameEnded; + unsigned allJobsCompleted; + unsigned long long frameContentSize; + unsigned long long consumed; + unsigned long long produced; + ZSTD_customMem cMem; + ZSTD_CDict* cdictLocal; + const ZSTD_CDict* cdict; + unsigned providedFactory: 1; +}; + +static void ZSTDMT_freeJobsTable(ZSTDMT_jobDescription* jobTable, U32 nbJobs, ZSTD_customMem cMem) +{ + U32 jobNb; + if (jobTable == NULL) return; + for (jobNb=0; jobNb mtctx->jobIDMask+1) { /* need more job capacity */ + ZSTDMT_freeJobsTable(mtctx->jobs, mtctx->jobIDMask+1, mtctx->cMem); + mtctx->jobIDMask = 0; + mtctx->jobs = ZSTDMT_createJobsTable(&nbJobs, mtctx->cMem); + if (mtctx->jobs==NULL) return ERROR(memory_allocation); + assert((nbJobs != 0) && ((nbJobs & (nbJobs - 1)) == 0)); /* ensure nbJobs is a power of 2 */ + mtctx->jobIDMask = nbJobs - 1; + } + return 0; +} + + +/* ZSTDMT_CCtxParam_setNbWorkers(): + * Internal use only */ +static size_t ZSTDMT_CCtxParam_setNbWorkers(ZSTD_CCtx_params* params, unsigned nbWorkers) +{ + return ZSTD_CCtxParams_setParameter(params, ZSTD_c_nbWorkers, (int)nbWorkers); +} + +MEM_STATIC ZSTDMT_CCtx* ZSTDMT_createCCtx_advanced_internal(unsigned nbWorkers, ZSTD_customMem cMem, ZSTD_threadPool* pool) +{ + ZSTDMT_CCtx* mtctx; + U32 nbJobs = nbWorkers + 2; + int initError; + DEBUGLOG(3, "ZSTDMT_createCCtx_advanced (nbWorkers = %u)", nbWorkers); + + if (nbWorkers < 1) return NULL; + nbWorkers = MIN(nbWorkers , ZSTDMT_NBWORKERS_MAX); + if ((cMem.customAlloc!=NULL) ^ (cMem.customFree!=NULL)) + /* invalid custom allocator */ + return NULL; + + mtctx = (ZSTDMT_CCtx*) ZSTD_customCalloc(sizeof(ZSTDMT_CCtx), cMem); + if (!mtctx) return NULL; + ZSTDMT_CCtxParam_setNbWorkers(&mtctx->params, nbWorkers); + mtctx->cMem = cMem; + mtctx->allJobsCompleted = 1; + if (pool != NULL) { + mtctx->factory = pool; + mtctx->providedFactory = 1; + } + else { + mtctx->factory = POOL_create_advanced(nbWorkers, 0, cMem); + mtctx->providedFactory = 0; + } + mtctx->jobs = ZSTDMT_createJobsTable(&nbJobs, cMem); + assert(nbJobs > 0); assert((nbJobs & (nbJobs - 1)) == 0); /* ensure nbJobs is a power of 2 */ + mtctx->jobIDMask = nbJobs - 1; + mtctx->bufPool = ZSTDMT_createBufferPool(nbWorkers, cMem); + mtctx->cctxPool = ZSTDMT_createCCtxPool(nbWorkers, cMem); + mtctx->seqPool = ZSTDMT_createSeqPool(nbWorkers, cMem); + initError = ZSTDMT_serialState_init(&mtctx->serial); + mtctx->roundBuff = kNullRoundBuff; + if (!mtctx->factory | !mtctx->jobs | !mtctx->bufPool | !mtctx->cctxPool | !mtctx->seqPool | initError) { + ZSTDMT_freeCCtx(mtctx); + return NULL; + } + DEBUGLOG(3, "mt_cctx created, for %u threads", nbWorkers); + return mtctx; +} + +ZSTDMT_CCtx* ZSTDMT_createCCtx_advanced(unsigned nbWorkers, ZSTD_customMem cMem, ZSTD_threadPool* pool) +{ +#ifdef ZSTD_MULTITHREAD + return ZSTDMT_createCCtx_advanced_internal(nbWorkers, cMem, pool); +#else + (void)nbWorkers; + (void)cMem; + (void)pool; + return NULL; +#endif +} + + +/* ZSTDMT_releaseAllJobResources() : + * note : ensure all workers are killed first ! */ +static void ZSTDMT_releaseAllJobResources(ZSTDMT_CCtx* mtctx) +{ + unsigned jobID; + DEBUGLOG(3, "ZSTDMT_releaseAllJobResources"); + for (jobID=0; jobID <= mtctx->jobIDMask; jobID++) { + /* Copy the mutex/cond out */ + ZSTD_pthread_mutex_t const mutex = mtctx->jobs[jobID].job_mutex; + ZSTD_pthread_cond_t const cond = mtctx->jobs[jobID].job_cond; + + DEBUGLOG(4, "job%02u: release dst address %08X", jobID, (U32)(size_t)mtctx->jobs[jobID].dstBuff.start); + ZSTDMT_releaseBuffer(mtctx->bufPool, mtctx->jobs[jobID].dstBuff); + + /* Clear the job description, but keep the mutex/cond */ + ZSTD_memset(&mtctx->jobs[jobID], 0, sizeof(mtctx->jobs[jobID])); + mtctx->jobs[jobID].job_mutex = mutex; + mtctx->jobs[jobID].job_cond = cond; + } + mtctx->inBuff.buffer = g_nullBuffer; + mtctx->inBuff.filled = 0; + mtctx->allJobsCompleted = 1; +} + +static void ZSTDMT_waitForAllJobsCompleted(ZSTDMT_CCtx* mtctx) +{ + DEBUGLOG(4, "ZSTDMT_waitForAllJobsCompleted"); + while (mtctx->doneJobID < mtctx->nextJobID) { + unsigned const jobID = mtctx->doneJobID & mtctx->jobIDMask; + ZSTD_PTHREAD_MUTEX_LOCK(&mtctx->jobs[jobID].job_mutex); + while (mtctx->jobs[jobID].consumed < mtctx->jobs[jobID].src.size) { + DEBUGLOG(4, "waiting for jobCompleted signal from job %u", mtctx->doneJobID); /* we want to block when waiting for data to flush */ + ZSTD_pthread_cond_wait(&mtctx->jobs[jobID].job_cond, &mtctx->jobs[jobID].job_mutex); + } + ZSTD_pthread_mutex_unlock(&mtctx->jobs[jobID].job_mutex); + mtctx->doneJobID++; + } +} + +size_t ZSTDMT_freeCCtx(ZSTDMT_CCtx* mtctx) +{ + if (mtctx==NULL) return 0; /* compatible with free on NULL */ + if (!mtctx->providedFactory) + POOL_free(mtctx->factory); /* stop and free worker threads */ + ZSTDMT_releaseAllJobResources(mtctx); /* release job resources into pools first */ + ZSTDMT_freeJobsTable(mtctx->jobs, mtctx->jobIDMask+1, mtctx->cMem); + ZSTDMT_freeBufferPool(mtctx->bufPool); + ZSTDMT_freeCCtxPool(mtctx->cctxPool); + ZSTDMT_freeSeqPool(mtctx->seqPool); + ZSTDMT_serialState_free(&mtctx->serial); + ZSTD_freeCDict(mtctx->cdictLocal); + if (mtctx->roundBuff.buffer) + ZSTD_customFree(mtctx->roundBuff.buffer, mtctx->cMem); + ZSTD_customFree(mtctx, mtctx->cMem); + return 0; +} + +size_t ZSTDMT_sizeof_CCtx(ZSTDMT_CCtx* mtctx) +{ + if (mtctx == NULL) return 0; /* supports sizeof NULL */ + return sizeof(*mtctx) + + POOL_sizeof(mtctx->factory) + + ZSTDMT_sizeof_bufferPool(mtctx->bufPool) + + (mtctx->jobIDMask+1) * sizeof(ZSTDMT_jobDescription) + + ZSTDMT_sizeof_CCtxPool(mtctx->cctxPool) + + ZSTDMT_sizeof_seqPool(mtctx->seqPool) + + ZSTD_sizeof_CDict(mtctx->cdictLocal) + + mtctx->roundBuff.capacity; +} + + +/* ZSTDMT_resize() : + * @return : error code if fails, 0 on success */ +static size_t ZSTDMT_resize(ZSTDMT_CCtx* mtctx, unsigned nbWorkers) +{ + if (POOL_resize(mtctx->factory, nbWorkers)) return ERROR(memory_allocation); + FORWARD_IF_ERROR( ZSTDMT_expandJobsTable(mtctx, nbWorkers) , ""); + mtctx->bufPool = ZSTDMT_expandBufferPool(mtctx->bufPool, nbWorkers); + if (mtctx->bufPool == NULL) return ERROR(memory_allocation); + mtctx->cctxPool = ZSTDMT_expandCCtxPool(mtctx->cctxPool, nbWorkers); + if (mtctx->cctxPool == NULL) return ERROR(memory_allocation); + mtctx->seqPool = ZSTDMT_expandSeqPool(mtctx->seqPool, nbWorkers); + if (mtctx->seqPool == NULL) return ERROR(memory_allocation); + ZSTDMT_CCtxParam_setNbWorkers(&mtctx->params, nbWorkers); + return 0; +} + + +/*! ZSTDMT_updateCParams_whileCompressing() : + * Updates a selected set of compression parameters, remaining compatible with currently active frame. + * New parameters will be applied to next compression job. */ +void ZSTDMT_updateCParams_whileCompressing(ZSTDMT_CCtx* mtctx, const ZSTD_CCtx_params* cctxParams) +{ + U32 const saved_wlog = mtctx->params.cParams.windowLog; /* Do not modify windowLog while compressing */ + int const compressionLevel = cctxParams->compressionLevel; + DEBUGLOG(5, "ZSTDMT_updateCParams_whileCompressing (level:%i)", + compressionLevel); + mtctx->params.compressionLevel = compressionLevel; + { ZSTD_compressionParameters cParams = ZSTD_getCParamsFromCCtxParams(cctxParams, ZSTD_CONTENTSIZE_UNKNOWN, 0, ZSTD_cpm_noAttachDict); + cParams.windowLog = saved_wlog; + mtctx->params.cParams = cParams; + } +} + +/* ZSTDMT_getFrameProgression(): + * tells how much data has been consumed (input) and produced (output) for current frame. + * able to count progression inside worker threads. + * Note : mutex will be acquired during statistics collection inside workers. */ +ZSTD_frameProgression ZSTDMT_getFrameProgression(ZSTDMT_CCtx* mtctx) +{ + ZSTD_frameProgression fps; + DEBUGLOG(5, "ZSTDMT_getFrameProgression"); + fps.ingested = mtctx->consumed + mtctx->inBuff.filled; + fps.consumed = mtctx->consumed; + fps.produced = fps.flushed = mtctx->produced; + fps.currentJobID = mtctx->nextJobID; + fps.nbActiveWorkers = 0; + { unsigned jobNb; + unsigned lastJobNb = mtctx->nextJobID + mtctx->jobReady; assert(mtctx->jobReady <= 1); + DEBUGLOG(6, "ZSTDMT_getFrameProgression: jobs: from %u to <%u (jobReady:%u)", + mtctx->doneJobID, lastJobNb, mtctx->jobReady) + for (jobNb = mtctx->doneJobID ; jobNb < lastJobNb ; jobNb++) { + unsigned const wJobID = jobNb & mtctx->jobIDMask; + ZSTDMT_jobDescription* jobPtr = &mtctx->jobs[wJobID]; + ZSTD_pthread_mutex_lock(&jobPtr->job_mutex); + { size_t const cResult = jobPtr->cSize; + size_t const produced = ZSTD_isError(cResult) ? 0 : cResult; + size_t const flushed = ZSTD_isError(cResult) ? 0 : jobPtr->dstFlushed; + assert(flushed <= produced); + fps.ingested += jobPtr->src.size; + fps.consumed += jobPtr->consumed; + fps.produced += produced; + fps.flushed += flushed; + fps.nbActiveWorkers += (jobPtr->consumed < jobPtr->src.size); + } + ZSTD_pthread_mutex_unlock(&mtctx->jobs[wJobID].job_mutex); + } + } + return fps; +} + + +size_t ZSTDMT_toFlushNow(ZSTDMT_CCtx* mtctx) +{ + size_t toFlush; + unsigned const jobID = mtctx->doneJobID; + assert(jobID <= mtctx->nextJobID); + if (jobID == mtctx->nextJobID) return 0; /* no active job => nothing to flush */ + + /* look into oldest non-fully-flushed job */ + { unsigned const wJobID = jobID & mtctx->jobIDMask; + ZSTDMT_jobDescription* const jobPtr = &mtctx->jobs[wJobID]; + ZSTD_pthread_mutex_lock(&jobPtr->job_mutex); + { size_t const cResult = jobPtr->cSize; + size_t const produced = ZSTD_isError(cResult) ? 0 : cResult; + size_t const flushed = ZSTD_isError(cResult) ? 0 : jobPtr->dstFlushed; + assert(flushed <= produced); + assert(jobPtr->consumed <= jobPtr->src.size); + toFlush = produced - flushed; + /* if toFlush==0, nothing is available to flush. + * However, jobID is expected to still be active: + * if jobID was already completed and fully flushed, + * ZSTDMT_flushProduced() should have already moved onto next job. + * Therefore, some input has not yet been consumed. */ + if (toFlush==0) { + assert(jobPtr->consumed < jobPtr->src.size); + } + } + ZSTD_pthread_mutex_unlock(&mtctx->jobs[wJobID].job_mutex); + } + + return toFlush; +} + + +/* ------------------------------------------ */ +/* ===== Multi-threaded compression ===== */ +/* ------------------------------------------ */ + +static unsigned ZSTDMT_computeTargetJobLog(const ZSTD_CCtx_params* params) +{ + unsigned jobLog; + if (params->ldmParams.enableLdm) { + /* In Long Range Mode, the windowLog is typically oversized. + * In which case, it's preferable to determine the jobSize + * based on cycleLog instead. */ + jobLog = MAX(21, ZSTD_cycleLog(params->cParams.chainLog, params->cParams.strategy) + 3); + } else { + jobLog = MAX(20, params->cParams.windowLog + 2); + } + return MIN(jobLog, (unsigned)ZSTDMT_JOBLOG_MAX); +} + +static int ZSTDMT_overlapLog_default(ZSTD_strategy strat) +{ + switch(strat) + { + case ZSTD_btultra2: + return 9; + case ZSTD_btultra: + case ZSTD_btopt: + return 8; + case ZSTD_btlazy2: + case ZSTD_lazy2: + return 7; + case ZSTD_lazy: + case ZSTD_greedy: + case ZSTD_dfast: + case ZSTD_fast: + default:; + } + return 6; +} + +static int ZSTDMT_overlapLog(int ovlog, ZSTD_strategy strat) +{ + assert(0 <= ovlog && ovlog <= 9); + if (ovlog == 0) return ZSTDMT_overlapLog_default(strat); + return ovlog; +} + +static size_t ZSTDMT_computeOverlapSize(const ZSTD_CCtx_params* params) +{ + int const overlapRLog = 9 - ZSTDMT_overlapLog(params->overlapLog, params->cParams.strategy); + int ovLog = (overlapRLog >= 8) ? 0 : (params->cParams.windowLog - overlapRLog); + assert(0 <= overlapRLog && overlapRLog <= 8); + if (params->ldmParams.enableLdm) { + /* In Long Range Mode, the windowLog is typically oversized. + * In which case, it's preferable to determine the jobSize + * based on chainLog instead. + * Then, ovLog becomes a fraction of the jobSize, rather than windowSize */ + ovLog = MIN(params->cParams.windowLog, ZSTDMT_computeTargetJobLog(params) - 2) + - overlapRLog; + } + assert(0 <= ovLog && ovLog <= ZSTD_WINDOWLOG_MAX); + DEBUGLOG(4, "overlapLog : %i", params->overlapLog); + DEBUGLOG(4, "overlap size : %i", 1 << ovLog); + return (ovLog==0) ? 0 : (size_t)1 << ovLog; +} + +/* ====================================== */ +/* ======= Streaming API ======= */ +/* ====================================== */ + +size_t ZSTDMT_initCStream_internal( + ZSTDMT_CCtx* mtctx, + const void* dict, size_t dictSize, ZSTD_dictContentType_e dictContentType, + const ZSTD_CDict* cdict, ZSTD_CCtx_params params, + unsigned long long pledgedSrcSize) +{ + DEBUGLOG(4, "ZSTDMT_initCStream_internal (pledgedSrcSize=%u, nbWorkers=%u, cctxPool=%u)", + (U32)pledgedSrcSize, params.nbWorkers, mtctx->cctxPool->totalCCtx); + + /* params supposed partially fully validated at this point */ + assert(!ZSTD_isError(ZSTD_checkCParams(params.cParams))); + assert(!((dict) && (cdict))); /* either dict or cdict, not both */ + + /* init */ + if (params.nbWorkers != mtctx->params.nbWorkers) + FORWARD_IF_ERROR( ZSTDMT_resize(mtctx, params.nbWorkers) , ""); + + if (params.jobSize != 0 && params.jobSize < ZSTDMT_JOBSIZE_MIN) params.jobSize = ZSTDMT_JOBSIZE_MIN; + if (params.jobSize > (size_t)ZSTDMT_JOBSIZE_MAX) params.jobSize = (size_t)ZSTDMT_JOBSIZE_MAX; + + DEBUGLOG(4, "ZSTDMT_initCStream_internal: %u workers", params.nbWorkers); + + if (mtctx->allJobsCompleted == 0) { /* previous compression not correctly finished */ + ZSTDMT_waitForAllJobsCompleted(mtctx); + ZSTDMT_releaseAllJobResources(mtctx); + mtctx->allJobsCompleted = 1; + } + + mtctx->params = params; + mtctx->frameContentSize = pledgedSrcSize; + if (dict) { + ZSTD_freeCDict(mtctx->cdictLocal); + mtctx->cdictLocal = ZSTD_createCDict_advanced(dict, dictSize, + ZSTD_dlm_byCopy, dictContentType, /* note : a loadPrefix becomes an internal CDict */ + params.cParams, mtctx->cMem); + mtctx->cdict = mtctx->cdictLocal; + if (mtctx->cdictLocal == NULL) return ERROR(memory_allocation); + } else { + ZSTD_freeCDict(mtctx->cdictLocal); + mtctx->cdictLocal = NULL; + mtctx->cdict = cdict; + } + + mtctx->targetPrefixSize = ZSTDMT_computeOverlapSize(¶ms); + DEBUGLOG(4, "overlapLog=%i => %u KB", params.overlapLog, (U32)(mtctx->targetPrefixSize>>10)); + mtctx->targetSectionSize = params.jobSize; + if (mtctx->targetSectionSize == 0) { + mtctx->targetSectionSize = 1ULL << ZSTDMT_computeTargetJobLog(¶ms); + } + assert(mtctx->targetSectionSize <= (size_t)ZSTDMT_JOBSIZE_MAX); + + if (params.rsyncable) { + /* Aim for the targetsectionSize as the average job size. */ + U32 const jobSizeKB = (U32)(mtctx->targetSectionSize >> 10); + U32 const rsyncBits = (assert(jobSizeKB >= 1), ZSTD_highbit32(jobSizeKB) + 10); + DEBUGLOG(4, "rsyncLog = %u", rsyncBits); + mtctx->rsync.hash = 0; + mtctx->rsync.hitMask = (1ULL << rsyncBits) - 1; + mtctx->rsync.primePower = ZSTD_rollingHash_primePower(RSYNC_LENGTH); + } + if (mtctx->targetSectionSize < mtctx->targetPrefixSize) mtctx->targetSectionSize = mtctx->targetPrefixSize; /* job size must be >= overlap size */ + DEBUGLOG(4, "Job Size : %u KB (note : set to %u)", (U32)(mtctx->targetSectionSize>>10), (U32)params.jobSize); + DEBUGLOG(4, "inBuff Size : %u KB", (U32)(mtctx->targetSectionSize>>10)); + ZSTDMT_setBufferSize(mtctx->bufPool, ZSTD_compressBound(mtctx->targetSectionSize)); + { + /* If ldm is enabled we need windowSize space. */ + size_t const windowSize = mtctx->params.ldmParams.enableLdm ? (1U << mtctx->params.cParams.windowLog) : 0; + /* Two buffers of slack, plus extra space for the overlap + * This is the minimum slack that LDM works with. One extra because + * flush might waste up to targetSectionSize-1 bytes. Another extra + * for the overlap (if > 0), then one to fill which doesn't overlap + * with the LDM window. + */ + size_t const nbSlackBuffers = 2 + (mtctx->targetPrefixSize > 0); + size_t const slackSize = mtctx->targetSectionSize * nbSlackBuffers; + /* Compute the total size, and always have enough slack */ + size_t const nbWorkers = MAX(mtctx->params.nbWorkers, 1); + size_t const sectionsSize = mtctx->targetSectionSize * nbWorkers; + size_t const capacity = MAX(windowSize, sectionsSize) + slackSize; + if (mtctx->roundBuff.capacity < capacity) { + if (mtctx->roundBuff.buffer) + ZSTD_customFree(mtctx->roundBuff.buffer, mtctx->cMem); + mtctx->roundBuff.buffer = (BYTE*)ZSTD_customMalloc(capacity, mtctx->cMem); + if (mtctx->roundBuff.buffer == NULL) { + mtctx->roundBuff.capacity = 0; + return ERROR(memory_allocation); + } + mtctx->roundBuff.capacity = capacity; + } + } + DEBUGLOG(4, "roundBuff capacity : %u KB", (U32)(mtctx->roundBuff.capacity>>10)); + mtctx->roundBuff.pos = 0; + mtctx->inBuff.buffer = g_nullBuffer; + mtctx->inBuff.filled = 0; + mtctx->inBuff.prefix = kNullRange; + mtctx->doneJobID = 0; + mtctx->nextJobID = 0; + mtctx->frameEnded = 0; + mtctx->allJobsCompleted = 0; + mtctx->consumed = 0; + mtctx->produced = 0; + if (ZSTDMT_serialState_reset(&mtctx->serial, mtctx->seqPool, params, mtctx->targetSectionSize, + dict, dictSize, dictContentType)) + return ERROR(memory_allocation); + return 0; +} + + +/* ZSTDMT_writeLastEmptyBlock() + * Write a single empty block with an end-of-frame to finish a frame. + * Job must be created from streaming variant. + * This function is always successful if expected conditions are fulfilled. + */ +static void ZSTDMT_writeLastEmptyBlock(ZSTDMT_jobDescription* job) +{ + assert(job->lastJob == 1); + assert(job->src.size == 0); /* last job is empty -> will be simplified into a last empty block */ + assert(job->firstJob == 0); /* cannot be first job, as it also needs to create frame header */ + assert(job->dstBuff.start == NULL); /* invoked from streaming variant only (otherwise, dstBuff might be user's output) */ + job->dstBuff = ZSTDMT_getBuffer(job->bufPool); + if (job->dstBuff.start == NULL) { + job->cSize = ERROR(memory_allocation); + return; + } + assert(job->dstBuff.capacity >= ZSTD_blockHeaderSize); /* no buffer should ever be that small */ + job->src = kNullRange; + job->cSize = ZSTD_writeLastEmptyBlock(job->dstBuff.start, job->dstBuff.capacity); + assert(!ZSTD_isError(job->cSize)); + assert(job->consumed == 0); +} + +static size_t ZSTDMT_createCompressionJob(ZSTDMT_CCtx* mtctx, size_t srcSize, ZSTD_EndDirective endOp) +{ + unsigned const jobID = mtctx->nextJobID & mtctx->jobIDMask; + int const endFrame = (endOp == ZSTD_e_end); + + if (mtctx->nextJobID > mtctx->doneJobID + mtctx->jobIDMask) { + DEBUGLOG(5, "ZSTDMT_createCompressionJob: will not create new job : table is full"); + assert((mtctx->nextJobID & mtctx->jobIDMask) == (mtctx->doneJobID & mtctx->jobIDMask)); + return 0; + } + + if (!mtctx->jobReady) { + BYTE const* src = (BYTE const*)mtctx->inBuff.buffer.start; + DEBUGLOG(5, "ZSTDMT_createCompressionJob: preparing job %u to compress %u bytes with %u preload ", + mtctx->nextJobID, (U32)srcSize, (U32)mtctx->inBuff.prefix.size); + mtctx->jobs[jobID].src.start = src; + mtctx->jobs[jobID].src.size = srcSize; + assert(mtctx->inBuff.filled >= srcSize); + mtctx->jobs[jobID].prefix = mtctx->inBuff.prefix; + mtctx->jobs[jobID].consumed = 0; + mtctx->jobs[jobID].cSize = 0; + mtctx->jobs[jobID].params = mtctx->params; + mtctx->jobs[jobID].cdict = mtctx->nextJobID==0 ? mtctx->cdict : NULL; + mtctx->jobs[jobID].fullFrameSize = mtctx->frameContentSize; + mtctx->jobs[jobID].dstBuff = g_nullBuffer; + mtctx->jobs[jobID].cctxPool = mtctx->cctxPool; + mtctx->jobs[jobID].bufPool = mtctx->bufPool; + mtctx->jobs[jobID].seqPool = mtctx->seqPool; + mtctx->jobs[jobID].serial = &mtctx->serial; + mtctx->jobs[jobID].jobID = mtctx->nextJobID; + mtctx->jobs[jobID].firstJob = (mtctx->nextJobID==0); + mtctx->jobs[jobID].lastJob = endFrame; + mtctx->jobs[jobID].frameChecksumNeeded = mtctx->params.fParams.checksumFlag && endFrame && (mtctx->nextJobID>0); + mtctx->jobs[jobID].dstFlushed = 0; + + /* Update the round buffer pos and clear the input buffer to be reset */ + mtctx->roundBuff.pos += srcSize; + mtctx->inBuff.buffer = g_nullBuffer; + mtctx->inBuff.filled = 0; + /* Set the prefix */ + if (!endFrame) { + size_t const newPrefixSize = MIN(srcSize, mtctx->targetPrefixSize); + mtctx->inBuff.prefix.start = src + srcSize - newPrefixSize; + mtctx->inBuff.prefix.size = newPrefixSize; + } else { /* endFrame==1 => no need for another input buffer */ + mtctx->inBuff.prefix = kNullRange; + mtctx->frameEnded = endFrame; + if (mtctx->nextJobID == 0) { + /* single job exception : checksum is already calculated directly within worker thread */ + mtctx->params.fParams.checksumFlag = 0; + } } + + if ( (srcSize == 0) + && (mtctx->nextJobID>0)/*single job must also write frame header*/ ) { + DEBUGLOG(5, "ZSTDMT_createCompressionJob: creating a last empty block to end frame"); + assert(endOp == ZSTD_e_end); /* only possible case : need to end the frame with an empty last block */ + ZSTDMT_writeLastEmptyBlock(mtctx->jobs + jobID); + mtctx->nextJobID++; + return 0; + } + } + + DEBUGLOG(5, "ZSTDMT_createCompressionJob: posting job %u : %u bytes (end:%u, jobNb == %u (mod:%u))", + mtctx->nextJobID, + (U32)mtctx->jobs[jobID].src.size, + mtctx->jobs[jobID].lastJob, + mtctx->nextJobID, + jobID); + if (POOL_tryAdd(mtctx->factory, ZSTDMT_compressionJob, &mtctx->jobs[jobID])) { + mtctx->nextJobID++; + mtctx->jobReady = 0; + } else { + DEBUGLOG(5, "ZSTDMT_createCompressionJob: no worker available for job %u", mtctx->nextJobID); + mtctx->jobReady = 1; + } + return 0; +} + + +/*! ZSTDMT_flushProduced() : + * flush whatever data has been produced but not yet flushed in current job. + * move to next job if current one is fully flushed. + * `output` : `pos` will be updated with amount of data flushed . + * `blockToFlush` : if >0, the function will block and wait if there is no data available to flush . + * @return : amount of data remaining within internal buffer, 0 if no more, 1 if unknown but > 0, or an error code */ +static size_t ZSTDMT_flushProduced(ZSTDMT_CCtx* mtctx, ZSTD_outBuffer* output, unsigned blockToFlush, ZSTD_EndDirective end) +{ + unsigned const wJobID = mtctx->doneJobID & mtctx->jobIDMask; + DEBUGLOG(5, "ZSTDMT_flushProduced (blocking:%u , job %u <= %u)", + blockToFlush, mtctx->doneJobID, mtctx->nextJobID); + assert(output->size >= output->pos); + + ZSTD_PTHREAD_MUTEX_LOCK(&mtctx->jobs[wJobID].job_mutex); + if ( blockToFlush + && (mtctx->doneJobID < mtctx->nextJobID) ) { + assert(mtctx->jobs[wJobID].dstFlushed <= mtctx->jobs[wJobID].cSize); + while (mtctx->jobs[wJobID].dstFlushed == mtctx->jobs[wJobID].cSize) { /* nothing to flush */ + if (mtctx->jobs[wJobID].consumed == mtctx->jobs[wJobID].src.size) { + DEBUGLOG(5, "job %u is completely consumed (%u == %u) => don't wait for cond, there will be none", + mtctx->doneJobID, (U32)mtctx->jobs[wJobID].consumed, (U32)mtctx->jobs[wJobID].src.size); + break; + } + DEBUGLOG(5, "waiting for something to flush from job %u (currently flushed: %u bytes)", + mtctx->doneJobID, (U32)mtctx->jobs[wJobID].dstFlushed); + ZSTD_pthread_cond_wait(&mtctx->jobs[wJobID].job_cond, &mtctx->jobs[wJobID].job_mutex); /* block when nothing to flush but some to come */ + } } + + /* try to flush something */ + { size_t cSize = mtctx->jobs[wJobID].cSize; /* shared */ + size_t const srcConsumed = mtctx->jobs[wJobID].consumed; /* shared */ + size_t const srcSize = mtctx->jobs[wJobID].src.size; /* read-only, could be done after mutex lock, but no-declaration-after-statement */ + ZSTD_pthread_mutex_unlock(&mtctx->jobs[wJobID].job_mutex); + if (ZSTD_isError(cSize)) { + DEBUGLOG(5, "ZSTDMT_flushProduced: job %u : compression error detected : %s", + mtctx->doneJobID, ZSTD_getErrorName(cSize)); + ZSTDMT_waitForAllJobsCompleted(mtctx); + ZSTDMT_releaseAllJobResources(mtctx); + return cSize; + } + /* add frame checksum if necessary (can only happen once) */ + assert(srcConsumed <= srcSize); + if ( (srcConsumed == srcSize) /* job completed -> worker no longer active */ + && mtctx->jobs[wJobID].frameChecksumNeeded ) { + U32 const checksum = (U32)XXH64_digest(&mtctx->serial.xxhState); + DEBUGLOG(4, "ZSTDMT_flushProduced: writing checksum : %08X \n", checksum); + MEM_writeLE32((char*)mtctx->jobs[wJobID].dstBuff.start + mtctx->jobs[wJobID].cSize, checksum); + cSize += 4; + mtctx->jobs[wJobID].cSize += 4; /* can write this shared value, as worker is no longer active */ + mtctx->jobs[wJobID].frameChecksumNeeded = 0; + } + + if (cSize > 0) { /* compression is ongoing or completed */ + size_t const toFlush = MIN(cSize - mtctx->jobs[wJobID].dstFlushed, output->size - output->pos); + DEBUGLOG(5, "ZSTDMT_flushProduced: Flushing %u bytes from job %u (completion:%u/%u, generated:%u)", + (U32)toFlush, mtctx->doneJobID, (U32)srcConsumed, (U32)srcSize, (U32)cSize); + assert(mtctx->doneJobID < mtctx->nextJobID); + assert(cSize >= mtctx->jobs[wJobID].dstFlushed); + assert(mtctx->jobs[wJobID].dstBuff.start != NULL); + if (toFlush > 0) { + ZSTD_memcpy((char*)output->dst + output->pos, + (const char*)mtctx->jobs[wJobID].dstBuff.start + mtctx->jobs[wJobID].dstFlushed, + toFlush); + } + output->pos += toFlush; + mtctx->jobs[wJobID].dstFlushed += toFlush; /* can write : this value is only used by mtctx */ + + if ( (srcConsumed == srcSize) /* job is completed */ + && (mtctx->jobs[wJobID].dstFlushed == cSize) ) { /* output buffer fully flushed => free this job position */ + DEBUGLOG(5, "Job %u completed (%u bytes), moving to next one", + mtctx->doneJobID, (U32)mtctx->jobs[wJobID].dstFlushed); + ZSTDMT_releaseBuffer(mtctx->bufPool, mtctx->jobs[wJobID].dstBuff); + DEBUGLOG(5, "dstBuffer released"); + mtctx->jobs[wJobID].dstBuff = g_nullBuffer; + mtctx->jobs[wJobID].cSize = 0; /* ensure this job slot is considered "not started" in future check */ + mtctx->consumed += srcSize; + mtctx->produced += cSize; + mtctx->doneJobID++; + } } + + /* return value : how many bytes left in buffer ; fake it to 1 when unknown but >0 */ + if (cSize > mtctx->jobs[wJobID].dstFlushed) return (cSize - mtctx->jobs[wJobID].dstFlushed); + if (srcSize > srcConsumed) return 1; /* current job not completely compressed */ + } + if (mtctx->doneJobID < mtctx->nextJobID) return 1; /* some more jobs ongoing */ + if (mtctx->jobReady) return 1; /* one job is ready to push, just not yet in the list */ + if (mtctx->inBuff.filled > 0) return 1; /* input is not empty, and still needs to be converted into a job */ + mtctx->allJobsCompleted = mtctx->frameEnded; /* all jobs are entirely flushed => if this one is last one, frame is completed */ + if (end == ZSTD_e_end) return !mtctx->frameEnded; /* for ZSTD_e_end, question becomes : is frame completed ? instead of : are internal buffers fully flushed ? */ + return 0; /* internal buffers fully flushed */ +} + +/** + * Returns the range of data used by the earliest job that is not yet complete. + * If the data of the first job is broken up into two segments, we cover both + * sections. + */ +static range_t ZSTDMT_getInputDataInUse(ZSTDMT_CCtx* mtctx) +{ + unsigned const firstJobID = mtctx->doneJobID; + unsigned const lastJobID = mtctx->nextJobID; + unsigned jobID; + + for (jobID = firstJobID; jobID < lastJobID; ++jobID) { + unsigned const wJobID = jobID & mtctx->jobIDMask; + size_t consumed; + + ZSTD_PTHREAD_MUTEX_LOCK(&mtctx->jobs[wJobID].job_mutex); + consumed = mtctx->jobs[wJobID].consumed; + ZSTD_pthread_mutex_unlock(&mtctx->jobs[wJobID].job_mutex); + + if (consumed < mtctx->jobs[wJobID].src.size) { + range_t range = mtctx->jobs[wJobID].prefix; + if (range.size == 0) { + /* Empty prefix */ + range = mtctx->jobs[wJobID].src; + } + /* Job source in multiple segments not supported yet */ + assert(range.start <= mtctx->jobs[wJobID].src.start); + return range; + } + } + return kNullRange; +} + +/** + * Returns non-zero iff buffer and range overlap. + */ +static int ZSTDMT_isOverlapped(buffer_t buffer, range_t range) +{ + BYTE const* const bufferStart = (BYTE const*)buffer.start; + BYTE const* const bufferEnd = bufferStart + buffer.capacity; + BYTE const* const rangeStart = (BYTE const*)range.start; + BYTE const* const rangeEnd = range.size != 0 ? rangeStart + range.size : rangeStart; + + if (rangeStart == NULL || bufferStart == NULL) + return 0; + /* Empty ranges cannot overlap */ + if (bufferStart == bufferEnd || rangeStart == rangeEnd) + return 0; + + return bufferStart < rangeEnd && rangeStart < bufferEnd; +} + +static int ZSTDMT_doesOverlapWindow(buffer_t buffer, ZSTD_window_t window) +{ + range_t extDict; + range_t prefix; + + DEBUGLOG(5, "ZSTDMT_doesOverlapWindow"); + extDict.start = window.dictBase + window.lowLimit; + extDict.size = window.dictLimit - window.lowLimit; + + prefix.start = window.base + window.dictLimit; + prefix.size = window.nextSrc - (window.base + window.dictLimit); + DEBUGLOG(5, "extDict [0x%zx, 0x%zx)", + (size_t)extDict.start, + (size_t)extDict.start + extDict.size); + DEBUGLOG(5, "prefix [0x%zx, 0x%zx)", + (size_t)prefix.start, + (size_t)prefix.start + prefix.size); + + return ZSTDMT_isOverlapped(buffer, extDict) + || ZSTDMT_isOverlapped(buffer, prefix); +} + +static void ZSTDMT_waitForLdmComplete(ZSTDMT_CCtx* mtctx, buffer_t buffer) +{ + if (mtctx->params.ldmParams.enableLdm) { + ZSTD_pthread_mutex_t* mutex = &mtctx->serial.ldmWindowMutex; + DEBUGLOG(5, "ZSTDMT_waitForLdmComplete"); + DEBUGLOG(5, "source [0x%zx, 0x%zx)", + (size_t)buffer.start, + (size_t)buffer.start + buffer.capacity); + ZSTD_PTHREAD_MUTEX_LOCK(mutex); + while (ZSTDMT_doesOverlapWindow(buffer, mtctx->serial.ldmWindow)) { + DEBUGLOG(5, "Waiting for LDM to finish..."); + ZSTD_pthread_cond_wait(&mtctx->serial.ldmWindowCond, mutex); + } + DEBUGLOG(6, "Done waiting for LDM to finish"); + ZSTD_pthread_mutex_unlock(mutex); + } +} + +/** + * Attempts to set the inBuff to the next section to fill. + * If any part of the new section is still in use we give up. + * Returns non-zero if the buffer is filled. + */ +static int ZSTDMT_tryGetInputRange(ZSTDMT_CCtx* mtctx) +{ + range_t const inUse = ZSTDMT_getInputDataInUse(mtctx); + size_t const spaceLeft = mtctx->roundBuff.capacity - mtctx->roundBuff.pos; + size_t const target = mtctx->targetSectionSize; + buffer_t buffer; + + DEBUGLOG(5, "ZSTDMT_tryGetInputRange"); + assert(mtctx->inBuff.buffer.start == NULL); + assert(mtctx->roundBuff.capacity >= target); + + if (spaceLeft < target) { + /* ZSTD_invalidateRepCodes() doesn't work for extDict variants. + * Simply copy the prefix to the beginning in that case. + */ + BYTE* const start = (BYTE*)mtctx->roundBuff.buffer; + size_t const prefixSize = mtctx->inBuff.prefix.size; + + buffer.start = start; + buffer.capacity = prefixSize; + if (ZSTDMT_isOverlapped(buffer, inUse)) { + DEBUGLOG(5, "Waiting for buffer..."); + return 0; + } + ZSTDMT_waitForLdmComplete(mtctx, buffer); + ZSTD_memmove(start, mtctx->inBuff.prefix.start, prefixSize); + mtctx->inBuff.prefix.start = start; + mtctx->roundBuff.pos = prefixSize; + } + buffer.start = mtctx->roundBuff.buffer + mtctx->roundBuff.pos; + buffer.capacity = target; + + if (ZSTDMT_isOverlapped(buffer, inUse)) { + DEBUGLOG(5, "Waiting for buffer..."); + return 0; + } + assert(!ZSTDMT_isOverlapped(buffer, mtctx->inBuff.prefix)); + + ZSTDMT_waitForLdmComplete(mtctx, buffer); + + DEBUGLOG(5, "Using prefix range [%zx, %zx)", + (size_t)mtctx->inBuff.prefix.start, + (size_t)mtctx->inBuff.prefix.start + mtctx->inBuff.prefix.size); + DEBUGLOG(5, "Using source range [%zx, %zx)", + (size_t)buffer.start, + (size_t)buffer.start + buffer.capacity); + + + mtctx->inBuff.buffer = buffer; + mtctx->inBuff.filled = 0; + assert(mtctx->roundBuff.pos + buffer.capacity <= mtctx->roundBuff.capacity); + return 1; +} + +typedef struct { + size_t toLoad; /* The number of bytes to load from the input. */ + int flush; /* Boolean declaring if we must flush because we found a synchronization point. */ +} syncPoint_t; + +/** + * Searches through the input for a synchronization point. If one is found, we + * will instruct the caller to flush, and return the number of bytes to load. + * Otherwise, we will load as many bytes as possible and instruct the caller + * to continue as normal. + */ +static syncPoint_t +findSynchronizationPoint(ZSTDMT_CCtx const* mtctx, ZSTD_inBuffer const input) +{ + BYTE const* const istart = (BYTE const*)input.src + input.pos; + U64 const primePower = mtctx->rsync.primePower; + U64 const hitMask = mtctx->rsync.hitMask; + + syncPoint_t syncPoint; + U64 hash; + BYTE const* prev; + size_t pos; + + syncPoint.toLoad = MIN(input.size - input.pos, mtctx->targetSectionSize - mtctx->inBuff.filled); + syncPoint.flush = 0; + if (!mtctx->params.rsyncable) + /* Rsync is disabled. */ + return syncPoint; + if (mtctx->inBuff.filled + syncPoint.toLoad < RSYNC_LENGTH) + /* Not enough to compute the hash. + * We will miss any synchronization points in this RSYNC_LENGTH byte + * window. However, since it depends only in the internal buffers, if the + * state is already synchronized, we will remain synchronized. + * Additionally, the probability that we miss a synchronization point is + * low: RSYNC_LENGTH / targetSectionSize. + */ + return syncPoint; + /* Initialize the loop variables. */ + if (mtctx->inBuff.filled >= RSYNC_LENGTH) { + /* We have enough bytes buffered to initialize the hash. + * Start scanning at the beginning of the input. + */ + pos = 0; + prev = (BYTE const*)mtctx->inBuff.buffer.start + mtctx->inBuff.filled - RSYNC_LENGTH; + hash = ZSTD_rollingHash_compute(prev, RSYNC_LENGTH); + if ((hash & hitMask) == hitMask) { + /* We're already at a sync point so don't load any more until + * we're able to flush this sync point. + * This likely happened because the job table was full so we + * couldn't add our job. + */ + syncPoint.toLoad = 0; + syncPoint.flush = 1; + return syncPoint; + } + } else { + /* We don't have enough bytes buffered to initialize the hash, but + * we know we have at least RSYNC_LENGTH bytes total. + * Start scanning after the first RSYNC_LENGTH bytes less the bytes + * already buffered. + */ + pos = RSYNC_LENGTH - mtctx->inBuff.filled; + prev = (BYTE const*)mtctx->inBuff.buffer.start - pos; + hash = ZSTD_rollingHash_compute(mtctx->inBuff.buffer.start, mtctx->inBuff.filled); + hash = ZSTD_rollingHash_append(hash, istart, pos); + } + /* Starting with the hash of the previous RSYNC_LENGTH bytes, roll + * through the input. If we hit a synchronization point, then cut the + * job off, and tell the compressor to flush the job. Otherwise, load + * all the bytes and continue as normal. + * If we go too long without a synchronization point (targetSectionSize) + * then a block will be emitted anyways, but this is okay, since if we + * are already synchronized we will remain synchronized. + */ + for (; pos < syncPoint.toLoad; ++pos) { + BYTE const toRemove = pos < RSYNC_LENGTH ? prev[pos] : istart[pos - RSYNC_LENGTH]; + /* if (pos >= RSYNC_LENGTH) assert(ZSTD_rollingHash_compute(istart + pos - RSYNC_LENGTH, RSYNC_LENGTH) == hash); */ + hash = ZSTD_rollingHash_rotate(hash, toRemove, istart[pos], primePower); + if ((hash & hitMask) == hitMask) { + syncPoint.toLoad = pos + 1; + syncPoint.flush = 1; + break; + } + } + return syncPoint; +} + +size_t ZSTDMT_nextInputSizeHint(const ZSTDMT_CCtx* mtctx) +{ + size_t hintInSize = mtctx->targetSectionSize - mtctx->inBuff.filled; + if (hintInSize==0) hintInSize = mtctx->targetSectionSize; + return hintInSize; +} + +/** ZSTDMT_compressStream_generic() : + * internal use only - exposed to be invoked from zstd_compress.c + * assumption : output and input are valid (pos <= size) + * @return : minimum amount of data remaining to flush, 0 if none */ +size_t ZSTDMT_compressStream_generic(ZSTDMT_CCtx* mtctx, + ZSTD_outBuffer* output, + ZSTD_inBuffer* input, + ZSTD_EndDirective endOp) +{ + unsigned forwardInputProgress = 0; + DEBUGLOG(5, "ZSTDMT_compressStream_generic (endOp=%u, srcSize=%u)", + (U32)endOp, (U32)(input->size - input->pos)); + assert(output->pos <= output->size); + assert(input->pos <= input->size); + + if ((mtctx->frameEnded) && (endOp==ZSTD_e_continue)) { + /* current frame being ended. Only flush/end are allowed */ + return ERROR(stage_wrong); + } + + /* fill input buffer */ + if ( (!mtctx->jobReady) + && (input->size > input->pos) ) { /* support NULL input */ + if (mtctx->inBuff.buffer.start == NULL) { + assert(mtctx->inBuff.filled == 0); /* Can't fill an empty buffer */ + if (!ZSTDMT_tryGetInputRange(mtctx)) { + /* It is only possible for this operation to fail if there are + * still compression jobs ongoing. + */ + DEBUGLOG(5, "ZSTDMT_tryGetInputRange failed"); + assert(mtctx->doneJobID != mtctx->nextJobID); + } else + DEBUGLOG(5, "ZSTDMT_tryGetInputRange completed successfully : mtctx->inBuff.buffer.start = %p", mtctx->inBuff.buffer.start); + } + if (mtctx->inBuff.buffer.start != NULL) { + syncPoint_t const syncPoint = findSynchronizationPoint(mtctx, *input); + if (syncPoint.flush && endOp == ZSTD_e_continue) { + endOp = ZSTD_e_flush; + } + assert(mtctx->inBuff.buffer.capacity >= mtctx->targetSectionSize); + DEBUGLOG(5, "ZSTDMT_compressStream_generic: adding %u bytes on top of %u to buffer of size %u", + (U32)syncPoint.toLoad, (U32)mtctx->inBuff.filled, (U32)mtctx->targetSectionSize); + ZSTD_memcpy((char*)mtctx->inBuff.buffer.start + mtctx->inBuff.filled, (const char*)input->src + input->pos, syncPoint.toLoad); + input->pos += syncPoint.toLoad; + mtctx->inBuff.filled += syncPoint.toLoad; + forwardInputProgress = syncPoint.toLoad>0; + } + } + if ((input->pos < input->size) && (endOp == ZSTD_e_end)) { + /* Can't end yet because the input is not fully consumed. + * We are in one of these cases: + * - mtctx->inBuff is NULL & empty: we couldn't get an input buffer so don't create a new job. + * - We filled the input buffer: flush this job but don't end the frame. + * - We hit a synchronization point: flush this job but don't end the frame. + */ + assert(mtctx->inBuff.filled == 0 || mtctx->inBuff.filled == mtctx->targetSectionSize || mtctx->params.rsyncable); + endOp = ZSTD_e_flush; + } + + if ( (mtctx->jobReady) + || (mtctx->inBuff.filled >= mtctx->targetSectionSize) /* filled enough : let's compress */ + || ((endOp != ZSTD_e_continue) && (mtctx->inBuff.filled > 0)) /* something to flush : let's go */ + || ((endOp == ZSTD_e_end) && (!mtctx->frameEnded)) ) { /* must finish the frame with a zero-size block */ + size_t const jobSize = mtctx->inBuff.filled; + assert(mtctx->inBuff.filled <= mtctx->targetSectionSize); + FORWARD_IF_ERROR( ZSTDMT_createCompressionJob(mtctx, jobSize, endOp) , ""); + } + + /* check for potential compressed data ready to be flushed */ + { size_t const remainingToFlush = ZSTDMT_flushProduced(mtctx, output, !forwardInputProgress, endOp); /* block if there was no forward input progress */ + if (input->pos < input->size) return MAX(remainingToFlush, 1); /* input not consumed : do not end flush yet */ + DEBUGLOG(5, "end of ZSTDMT_compressStream_generic: remainingToFlush = %u", (U32)remainingToFlush); + return remainingToFlush; + } +} diff --git a/external/zstd/lib/compress/zstdmt_compress.h b/external/zstd/lib/compress/zstdmt_compress.h new file mode 100644 index 00000000..2fee2ec7 --- /dev/null +++ b/external/zstd/lib/compress/zstdmt_compress.h @@ -0,0 +1,110 @@ +/* + * Copyright (c) Yann Collet, Facebook, Inc. + * All rights reserved. + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. + */ + + #ifndef ZSTDMT_COMPRESS_H + #define ZSTDMT_COMPRESS_H + + #if defined (__cplusplus) + extern "C" { + #endif + + +/* Note : This is an internal API. + * These APIs used to be exposed with ZSTDLIB_API, + * because it used to be the only way to invoke MT compression. + * Now, you must use ZSTD_compress2 and ZSTD_compressStream2() instead. + * + * This API requires ZSTD_MULTITHREAD to be defined during compilation, + * otherwise ZSTDMT_createCCtx*() will fail. + */ + +/* === Dependencies === */ +#include "../common/zstd_deps.h" /* size_t */ +#define ZSTD_STATIC_LINKING_ONLY /* ZSTD_parameters */ +#include "../zstd.h" /* ZSTD_inBuffer, ZSTD_outBuffer, ZSTDLIB_API */ + + +/* === Constants === */ +#ifndef ZSTDMT_NBWORKERS_MAX /* a different value can be selected at compile time */ +# define ZSTDMT_NBWORKERS_MAX ((sizeof(void*)==4) /*32-bit*/ ? 64 : 256) +#endif +#ifndef ZSTDMT_JOBSIZE_MIN /* a different value can be selected at compile time */ +# define ZSTDMT_JOBSIZE_MIN (512 KB) +#endif +#define ZSTDMT_JOBLOG_MAX (MEM_32bits() ? 29 : 30) +#define ZSTDMT_JOBSIZE_MAX (MEM_32bits() ? (512 MB) : (1024 MB)) + + +/* ======================================================== + * === Private interface, for use by ZSTD_compress.c === + * === Not exposed in libzstd. Never invoke directly === + * ======================================================== */ + +/* === Memory management === */ +typedef struct ZSTDMT_CCtx_s ZSTDMT_CCtx; +/* Requires ZSTD_MULTITHREAD to be defined during compilation, otherwise it will return NULL. */ +ZSTDMT_CCtx* ZSTDMT_createCCtx_advanced(unsigned nbWorkers, + ZSTD_customMem cMem, + ZSTD_threadPool *pool); +size_t ZSTDMT_freeCCtx(ZSTDMT_CCtx* mtctx); + +size_t ZSTDMT_sizeof_CCtx(ZSTDMT_CCtx* mtctx); + +/* === Streaming functions === */ + +size_t ZSTDMT_nextInputSizeHint(const ZSTDMT_CCtx* mtctx); + +/*! ZSTDMT_initCStream_internal() : + * Private use only. Init streaming operation. + * expects params to be valid. + * must receive dict, or cdict, or none, but not both. + * @return : 0, or an error code */ +size_t ZSTDMT_initCStream_internal(ZSTDMT_CCtx* zcs, + const void* dict, size_t dictSize, ZSTD_dictContentType_e dictContentType, + const ZSTD_CDict* cdict, + ZSTD_CCtx_params params, unsigned long long pledgedSrcSize); + +/*! ZSTDMT_compressStream_generic() : + * Combines ZSTDMT_compressStream() with optional ZSTDMT_flushStream() or ZSTDMT_endStream() + * depending on flush directive. + * @return : minimum amount of data still to be flushed + * 0 if fully flushed + * or an error code + * note : needs to be init using any ZSTD_initCStream*() variant */ +size_t ZSTDMT_compressStream_generic(ZSTDMT_CCtx* mtctx, + ZSTD_outBuffer* output, + ZSTD_inBuffer* input, + ZSTD_EndDirective endOp); + + /*! ZSTDMT_toFlushNow() + * Tell how many bytes are ready to be flushed immediately. + * Probe the oldest active job (not yet entirely flushed) and check its output buffer. + * If return 0, it means there is no active job, + * or, it means oldest job is still active, but everything produced has been flushed so far, + * therefore flushing is limited by speed of oldest job. */ +size_t ZSTDMT_toFlushNow(ZSTDMT_CCtx* mtctx); + +/*! ZSTDMT_updateCParams_whileCompressing() : + * Updates only a selected set of compression parameters, to remain compatible with current frame. + * New parameters will be applied to next compression job. */ +void ZSTDMT_updateCParams_whileCompressing(ZSTDMT_CCtx* mtctx, const ZSTD_CCtx_params* cctxParams); + +/*! ZSTDMT_getFrameProgression(): + * tells how much data has been consumed (input) and produced (output) for current frame. + * able to count progression inside worker threads. + */ +ZSTD_frameProgression ZSTDMT_getFrameProgression(ZSTDMT_CCtx* mtctx); + + +#if defined (__cplusplus) +} +#endif + +#endif /* ZSTDMT_COMPRESS_H */ diff --git a/external/zstd/lib/decompress/huf_decompress.c b/external/zstd/lib/decompress/huf_decompress.c new file mode 100644 index 00000000..b93c9a00 --- /dev/null +++ b/external/zstd/lib/decompress/huf_decompress.c @@ -0,0 +1,1351 @@ +/* ****************************************************************** + * huff0 huffman decoder, + * part of Finite State Entropy library + * Copyright (c) Yann Collet, Facebook, Inc. + * + * You can contact the author at : + * - FSE+HUF source repository : https://github.com/Cyan4973/FiniteStateEntropy + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. +****************************************************************** */ + +/* ************************************************************** +* Dependencies +****************************************************************/ +#include "../common/zstd_deps.h" /* ZSTD_memcpy, ZSTD_memset */ +#include "../common/compiler.h" +#include "../common/bitstream.h" /* BIT_* */ +#include "../common/fse.h" /* to compress headers */ +#define HUF_STATIC_LINKING_ONLY +#include "../common/huf.h" +#include "../common/error_private.h" + +/* ************************************************************** +* Macros +****************************************************************/ + +/* These two optional macros force the use one way or another of the two + * Huffman decompression implementations. You can't force in both directions + * at the same time. + */ +#if defined(HUF_FORCE_DECOMPRESS_X1) && \ + defined(HUF_FORCE_DECOMPRESS_X2) +#error "Cannot force the use of the X1 and X2 decoders at the same time!" +#endif + + +/* ************************************************************** +* Error Management +****************************************************************/ +#define HUF_isError ERR_isError + + +/* ************************************************************** +* Byte alignment for workSpace management +****************************************************************/ +#define HUF_ALIGN(x, a) HUF_ALIGN_MASK((x), (a) - 1) +#define HUF_ALIGN_MASK(x, mask) (((x) + (mask)) & ~(mask)) + + +/* ************************************************************** +* BMI2 Variant Wrappers +****************************************************************/ +#if DYNAMIC_BMI2 + +#define HUF_DGEN(fn) \ + \ + static size_t fn##_default( \ + void* dst, size_t dstSize, \ + const void* cSrc, size_t cSrcSize, \ + const HUF_DTable* DTable) \ + { \ + return fn##_body(dst, dstSize, cSrc, cSrcSize, DTable); \ + } \ + \ + static TARGET_ATTRIBUTE("bmi2") size_t fn##_bmi2( \ + void* dst, size_t dstSize, \ + const void* cSrc, size_t cSrcSize, \ + const HUF_DTable* DTable) \ + { \ + return fn##_body(dst, dstSize, cSrc, cSrcSize, DTable); \ + } \ + \ + static size_t fn(void* dst, size_t dstSize, void const* cSrc, \ + size_t cSrcSize, HUF_DTable const* DTable, int bmi2) \ + { \ + if (bmi2) { \ + return fn##_bmi2(dst, dstSize, cSrc, cSrcSize, DTable); \ + } \ + return fn##_default(dst, dstSize, cSrc, cSrcSize, DTable); \ + } + +#else + +#define HUF_DGEN(fn) \ + static size_t fn(void* dst, size_t dstSize, void const* cSrc, \ + size_t cSrcSize, HUF_DTable const* DTable, int bmi2) \ + { \ + (void)bmi2; \ + return fn##_body(dst, dstSize, cSrc, cSrcSize, DTable); \ + } + +#endif + + +/*-***************************/ +/* generic DTableDesc */ +/*-***************************/ +typedef struct { BYTE maxTableLog; BYTE tableType; BYTE tableLog; BYTE reserved; } DTableDesc; + +static DTableDesc HUF_getDTableDesc(const HUF_DTable* table) +{ + DTableDesc dtd; + ZSTD_memcpy(&dtd, table, sizeof(dtd)); + return dtd; +} + + +#ifndef HUF_FORCE_DECOMPRESS_X2 + +/*-***************************/ +/* single-symbol decoding */ +/*-***************************/ +typedef struct { BYTE byte; BYTE nbBits; } HUF_DEltX1; /* single-symbol decoding */ + +/** + * Packs 4 HUF_DEltX1 structs into a U64. This is used to lay down 4 entries at + * a time. + */ +static U64 HUF_DEltX1_set4(BYTE symbol, BYTE nbBits) { + U64 D4; + if (MEM_isLittleEndian()) { + D4 = symbol + (nbBits << 8); + } else { + D4 = (symbol << 8) + nbBits; + } + D4 *= 0x0001000100010001ULL; + return D4; +} + +typedef struct { + U32 rankVal[HUF_TABLELOG_ABSOLUTEMAX + 1]; + U32 rankStart[HUF_TABLELOG_ABSOLUTEMAX + 1]; + U32 statsWksp[HUF_READ_STATS_WORKSPACE_SIZE_U32]; + BYTE symbols[HUF_SYMBOLVALUE_MAX + 1]; + BYTE huffWeight[HUF_SYMBOLVALUE_MAX + 1]; +} HUF_ReadDTableX1_Workspace; + + +size_t HUF_readDTableX1_wksp(HUF_DTable* DTable, const void* src, size_t srcSize, void* workSpace, size_t wkspSize) +{ + return HUF_readDTableX1_wksp_bmi2(DTable, src, srcSize, workSpace, wkspSize, /* bmi2 */ 0); +} + +size_t HUF_readDTableX1_wksp_bmi2(HUF_DTable* DTable, const void* src, size_t srcSize, void* workSpace, size_t wkspSize, int bmi2) +{ + U32 tableLog = 0; + U32 nbSymbols = 0; + size_t iSize; + void* const dtPtr = DTable + 1; + HUF_DEltX1* const dt = (HUF_DEltX1*)dtPtr; + HUF_ReadDTableX1_Workspace* wksp = (HUF_ReadDTableX1_Workspace*)workSpace; + + DEBUG_STATIC_ASSERT(HUF_DECOMPRESS_WORKSPACE_SIZE >= sizeof(*wksp)); + if (sizeof(*wksp) > wkspSize) return ERROR(tableLog_tooLarge); + + DEBUG_STATIC_ASSERT(sizeof(DTableDesc) == sizeof(HUF_DTable)); + /* ZSTD_memset(huffWeight, 0, sizeof(huffWeight)); */ /* is not necessary, even though some analyzer complain ... */ + + iSize = HUF_readStats_wksp(wksp->huffWeight, HUF_SYMBOLVALUE_MAX + 1, wksp->rankVal, &nbSymbols, &tableLog, src, srcSize, wksp->statsWksp, sizeof(wksp->statsWksp), bmi2); + if (HUF_isError(iSize)) return iSize; + + /* Table header */ + { DTableDesc dtd = HUF_getDTableDesc(DTable); + if (tableLog > (U32)(dtd.maxTableLog+1)) return ERROR(tableLog_tooLarge); /* DTable too small, Huffman tree cannot fit in */ + dtd.tableType = 0; + dtd.tableLog = (BYTE)tableLog; + ZSTD_memcpy(DTable, &dtd, sizeof(dtd)); + } + + /* Compute symbols and rankStart given rankVal: + * + * rankVal already contains the number of values of each weight. + * + * symbols contains the symbols ordered by weight. First are the rankVal[0] + * weight 0 symbols, followed by the rankVal[1] weight 1 symbols, and so on. + * symbols[0] is filled (but unused) to avoid a branch. + * + * rankStart contains the offset where each rank belongs in the DTable. + * rankStart[0] is not filled because there are no entries in the table for + * weight 0. + */ + { + int n; + int nextRankStart = 0; + int const unroll = 4; + int const nLimit = (int)nbSymbols - unroll + 1; + for (n=0; n<(int)tableLog+1; n++) { + U32 const curr = nextRankStart; + nextRankStart += wksp->rankVal[n]; + wksp->rankStart[n] = curr; + } + for (n=0; n < nLimit; n += unroll) { + int u; + for (u=0; u < unroll; ++u) { + size_t const w = wksp->huffWeight[n+u]; + wksp->symbols[wksp->rankStart[w]++] = (BYTE)(n+u); + } + } + for (; n < (int)nbSymbols; ++n) { + size_t const w = wksp->huffWeight[n]; + wksp->symbols[wksp->rankStart[w]++] = (BYTE)n; + } + } + + /* fill DTable + * We fill all entries of each weight in order. + * That way length is a constant for each iteration of the outter loop. + * We can switch based on the length to a different inner loop which is + * optimized for that particular case. + */ + { + U32 w; + int symbol=wksp->rankVal[0]; + int rankStart=0; + for (w=1; wrankVal[w]; + int const length = (1 << w) >> 1; + int uStart = rankStart; + BYTE const nbBits = (BYTE)(tableLog + 1 - w); + int s; + int u; + switch (length) { + case 1: + for (s=0; ssymbols[symbol + s]; + D.nbBits = nbBits; + dt[uStart] = D; + uStart += 1; + } + break; + case 2: + for (s=0; ssymbols[symbol + s]; + D.nbBits = nbBits; + dt[uStart+0] = D; + dt[uStart+1] = D; + uStart += 2; + } + break; + case 4: + for (s=0; ssymbols[symbol + s], nbBits); + MEM_write64(dt + uStart, D4); + uStart += 4; + } + break; + case 8: + for (s=0; ssymbols[symbol + s], nbBits); + MEM_write64(dt + uStart, D4); + MEM_write64(dt + uStart + 4, D4); + uStart += 8; + } + break; + default: + for (s=0; ssymbols[symbol + s], nbBits); + for (u=0; u < length; u += 16) { + MEM_write64(dt + uStart + u + 0, D4); + MEM_write64(dt + uStart + u + 4, D4); + MEM_write64(dt + uStart + u + 8, D4); + MEM_write64(dt + uStart + u + 12, D4); + } + assert(u == length); + uStart += length; + } + break; + } + symbol += symbolCount; + rankStart += symbolCount * length; + } + } + return iSize; +} + +FORCE_INLINE_TEMPLATE BYTE +HUF_decodeSymbolX1(BIT_DStream_t* Dstream, const HUF_DEltX1* dt, const U32 dtLog) +{ + size_t const val = BIT_lookBitsFast(Dstream, dtLog); /* note : dtLog >= 1 */ + BYTE const c = dt[val].byte; + BIT_skipBits(Dstream, dt[val].nbBits); + return c; +} + +#define HUF_DECODE_SYMBOLX1_0(ptr, DStreamPtr) \ + *ptr++ = HUF_decodeSymbolX1(DStreamPtr, dt, dtLog) + +#define HUF_DECODE_SYMBOLX1_1(ptr, DStreamPtr) \ + if (MEM_64bits() || (HUF_TABLELOG_MAX<=12)) \ + HUF_DECODE_SYMBOLX1_0(ptr, DStreamPtr) + +#define HUF_DECODE_SYMBOLX1_2(ptr, DStreamPtr) \ + if (MEM_64bits()) \ + HUF_DECODE_SYMBOLX1_0(ptr, DStreamPtr) + +HINT_INLINE size_t +HUF_decodeStreamX1(BYTE* p, BIT_DStream_t* const bitDPtr, BYTE* const pEnd, const HUF_DEltX1* const dt, const U32 dtLog) +{ + BYTE* const pStart = p; + + /* up to 4 symbols at a time */ + while ((BIT_reloadDStream(bitDPtr) == BIT_DStream_unfinished) & (p < pEnd-3)) { + HUF_DECODE_SYMBOLX1_2(p, bitDPtr); + HUF_DECODE_SYMBOLX1_1(p, bitDPtr); + HUF_DECODE_SYMBOLX1_2(p, bitDPtr); + HUF_DECODE_SYMBOLX1_0(p, bitDPtr); + } + + /* [0-3] symbols remaining */ + if (MEM_32bits()) + while ((BIT_reloadDStream(bitDPtr) == BIT_DStream_unfinished) & (p < pEnd)) + HUF_DECODE_SYMBOLX1_0(p, bitDPtr); + + /* no more data to retrieve from bitstream, no need to reload */ + while (p < pEnd) + HUF_DECODE_SYMBOLX1_0(p, bitDPtr); + + return pEnd-pStart; +} + +FORCE_INLINE_TEMPLATE size_t +HUF_decompress1X1_usingDTable_internal_body( + void* dst, size_t dstSize, + const void* cSrc, size_t cSrcSize, + const HUF_DTable* DTable) +{ + BYTE* op = (BYTE*)dst; + BYTE* const oend = op + dstSize; + const void* dtPtr = DTable + 1; + const HUF_DEltX1* const dt = (const HUF_DEltX1*)dtPtr; + BIT_DStream_t bitD; + DTableDesc const dtd = HUF_getDTableDesc(DTable); + U32 const dtLog = dtd.tableLog; + + CHECK_F( BIT_initDStream(&bitD, cSrc, cSrcSize) ); + + HUF_decodeStreamX1(op, &bitD, oend, dt, dtLog); + + if (!BIT_endOfDStream(&bitD)) return ERROR(corruption_detected); + + return dstSize; +} + +FORCE_INLINE_TEMPLATE size_t +HUF_decompress4X1_usingDTable_internal_body( + void* dst, size_t dstSize, + const void* cSrc, size_t cSrcSize, + const HUF_DTable* DTable) +{ + /* Check */ + if (cSrcSize < 10) return ERROR(corruption_detected); /* strict minimum : jump table + 1 byte per stream */ + + { const BYTE* const istart = (const BYTE*) cSrc; + BYTE* const ostart = (BYTE*) dst; + BYTE* const oend = ostart + dstSize; + BYTE* const olimit = oend - 3; + const void* const dtPtr = DTable + 1; + const HUF_DEltX1* const dt = (const HUF_DEltX1*)dtPtr; + + /* Init */ + BIT_DStream_t bitD1; + BIT_DStream_t bitD2; + BIT_DStream_t bitD3; + BIT_DStream_t bitD4; + size_t const length1 = MEM_readLE16(istart); + size_t const length2 = MEM_readLE16(istart+2); + size_t const length3 = MEM_readLE16(istart+4); + size_t const length4 = cSrcSize - (length1 + length2 + length3 + 6); + const BYTE* const istart1 = istart + 6; /* jumpTable */ + const BYTE* const istart2 = istart1 + length1; + const BYTE* const istart3 = istart2 + length2; + const BYTE* const istart4 = istart3 + length3; + const size_t segmentSize = (dstSize+3) / 4; + BYTE* const opStart2 = ostart + segmentSize; + BYTE* const opStart3 = opStart2 + segmentSize; + BYTE* const opStart4 = opStart3 + segmentSize; + BYTE* op1 = ostart; + BYTE* op2 = opStart2; + BYTE* op3 = opStart3; + BYTE* op4 = opStart4; + DTableDesc const dtd = HUF_getDTableDesc(DTable); + U32 const dtLog = dtd.tableLog; + U32 endSignal = 1; + + if (length4 > cSrcSize) return ERROR(corruption_detected); /* overflow */ + CHECK_F( BIT_initDStream(&bitD1, istart1, length1) ); + CHECK_F( BIT_initDStream(&bitD2, istart2, length2) ); + CHECK_F( BIT_initDStream(&bitD3, istart3, length3) ); + CHECK_F( BIT_initDStream(&bitD4, istart4, length4) ); + + /* up to 16 symbols per loop (4 symbols per stream) in 64-bit mode */ + for ( ; (endSignal) & (op4 < olimit) ; ) { + HUF_DECODE_SYMBOLX1_2(op1, &bitD1); + HUF_DECODE_SYMBOLX1_2(op2, &bitD2); + HUF_DECODE_SYMBOLX1_2(op3, &bitD3); + HUF_DECODE_SYMBOLX1_2(op4, &bitD4); + HUF_DECODE_SYMBOLX1_1(op1, &bitD1); + HUF_DECODE_SYMBOLX1_1(op2, &bitD2); + HUF_DECODE_SYMBOLX1_1(op3, &bitD3); + HUF_DECODE_SYMBOLX1_1(op4, &bitD4); + HUF_DECODE_SYMBOLX1_2(op1, &bitD1); + HUF_DECODE_SYMBOLX1_2(op2, &bitD2); + HUF_DECODE_SYMBOLX1_2(op3, &bitD3); + HUF_DECODE_SYMBOLX1_2(op4, &bitD4); + HUF_DECODE_SYMBOLX1_0(op1, &bitD1); + HUF_DECODE_SYMBOLX1_0(op2, &bitD2); + HUF_DECODE_SYMBOLX1_0(op3, &bitD3); + HUF_DECODE_SYMBOLX1_0(op4, &bitD4); + endSignal &= BIT_reloadDStreamFast(&bitD1) == BIT_DStream_unfinished; + endSignal &= BIT_reloadDStreamFast(&bitD2) == BIT_DStream_unfinished; + endSignal &= BIT_reloadDStreamFast(&bitD3) == BIT_DStream_unfinished; + endSignal &= BIT_reloadDStreamFast(&bitD4) == BIT_DStream_unfinished; + } + + /* check corruption */ + /* note : should not be necessary : op# advance in lock step, and we control op4. + * but curiously, binary generated by gcc 7.2 & 7.3 with -mbmi2 runs faster when >=1 test is present */ + if (op1 > opStart2) return ERROR(corruption_detected); + if (op2 > opStart3) return ERROR(corruption_detected); + if (op3 > opStart4) return ERROR(corruption_detected); + /* note : op4 supposed already verified within main loop */ + + /* finish bitStreams one by one */ + HUF_decodeStreamX1(op1, &bitD1, opStart2, dt, dtLog); + HUF_decodeStreamX1(op2, &bitD2, opStart3, dt, dtLog); + HUF_decodeStreamX1(op3, &bitD3, opStart4, dt, dtLog); + HUF_decodeStreamX1(op4, &bitD4, oend, dt, dtLog); + + /* check */ + { U32 const endCheck = BIT_endOfDStream(&bitD1) & BIT_endOfDStream(&bitD2) & BIT_endOfDStream(&bitD3) & BIT_endOfDStream(&bitD4); + if (!endCheck) return ERROR(corruption_detected); } + + /* decoded size */ + return dstSize; + } +} + + +typedef size_t (*HUF_decompress_usingDTable_t)(void *dst, size_t dstSize, + const void *cSrc, + size_t cSrcSize, + const HUF_DTable *DTable); + +HUF_DGEN(HUF_decompress1X1_usingDTable_internal) +HUF_DGEN(HUF_decompress4X1_usingDTable_internal) + + + +size_t HUF_decompress1X1_usingDTable( + void* dst, size_t dstSize, + const void* cSrc, size_t cSrcSize, + const HUF_DTable* DTable) +{ + DTableDesc dtd = HUF_getDTableDesc(DTable); + if (dtd.tableType != 0) return ERROR(GENERIC); + return HUF_decompress1X1_usingDTable_internal(dst, dstSize, cSrc, cSrcSize, DTable, /* bmi2 */ 0); +} + +size_t HUF_decompress1X1_DCtx_wksp(HUF_DTable* DCtx, void* dst, size_t dstSize, + const void* cSrc, size_t cSrcSize, + void* workSpace, size_t wkspSize) +{ + const BYTE* ip = (const BYTE*) cSrc; + + size_t const hSize = HUF_readDTableX1_wksp(DCtx, cSrc, cSrcSize, workSpace, wkspSize); + if (HUF_isError(hSize)) return hSize; + if (hSize >= cSrcSize) return ERROR(srcSize_wrong); + ip += hSize; cSrcSize -= hSize; + + return HUF_decompress1X1_usingDTable_internal(dst, dstSize, ip, cSrcSize, DCtx, /* bmi2 */ 0); +} + + +size_t HUF_decompress4X1_usingDTable( + void* dst, size_t dstSize, + const void* cSrc, size_t cSrcSize, + const HUF_DTable* DTable) +{ + DTableDesc dtd = HUF_getDTableDesc(DTable); + if (dtd.tableType != 0) return ERROR(GENERIC); + return HUF_decompress4X1_usingDTable_internal(dst, dstSize, cSrc, cSrcSize, DTable, /* bmi2 */ 0); +} + +static size_t HUF_decompress4X1_DCtx_wksp_bmi2(HUF_DTable* dctx, void* dst, size_t dstSize, + const void* cSrc, size_t cSrcSize, + void* workSpace, size_t wkspSize, int bmi2) +{ + const BYTE* ip = (const BYTE*) cSrc; + + size_t const hSize = HUF_readDTableX1_wksp_bmi2(dctx, cSrc, cSrcSize, workSpace, wkspSize, bmi2); + if (HUF_isError(hSize)) return hSize; + if (hSize >= cSrcSize) return ERROR(srcSize_wrong); + ip += hSize; cSrcSize -= hSize; + + return HUF_decompress4X1_usingDTable_internal(dst, dstSize, ip, cSrcSize, dctx, bmi2); +} + +size_t HUF_decompress4X1_DCtx_wksp(HUF_DTable* dctx, void* dst, size_t dstSize, + const void* cSrc, size_t cSrcSize, + void* workSpace, size_t wkspSize) +{ + return HUF_decompress4X1_DCtx_wksp_bmi2(dctx, dst, dstSize, cSrc, cSrcSize, workSpace, wkspSize, 0); +} + + +#endif /* HUF_FORCE_DECOMPRESS_X2 */ + + +#ifndef HUF_FORCE_DECOMPRESS_X1 + +/* *************************/ +/* double-symbols decoding */ +/* *************************/ + +typedef struct { U16 sequence; BYTE nbBits; BYTE length; } HUF_DEltX2; /* double-symbols decoding */ +typedef struct { BYTE symbol; BYTE weight; } sortedSymbol_t; +typedef U32 rankValCol_t[HUF_TABLELOG_MAX + 1]; +typedef rankValCol_t rankVal_t[HUF_TABLELOG_MAX]; + + +/* HUF_fillDTableX2Level2() : + * `rankValOrigin` must be a table of at least (HUF_TABLELOG_MAX + 1) U32 */ +static void HUF_fillDTableX2Level2(HUF_DEltX2* DTable, U32 sizeLog, const U32 consumed, + const U32* rankValOrigin, const int minWeight, + const sortedSymbol_t* sortedSymbols, const U32 sortedListSize, + U32 nbBitsBaseline, U16 baseSeq, U32* wksp, size_t wkspSize) +{ + HUF_DEltX2 DElt; + U32* rankVal = wksp; + + assert(wkspSize >= HUF_TABLELOG_MAX + 1); + (void)wkspSize; + /* get pre-calculated rankVal */ + ZSTD_memcpy(rankVal, rankValOrigin, sizeof(U32) * (HUF_TABLELOG_MAX + 1)); + + /* fill skipped values */ + if (minWeight>1) { + U32 i, skipSize = rankVal[minWeight]; + MEM_writeLE16(&(DElt.sequence), baseSeq); + DElt.nbBits = (BYTE)(consumed); + DElt.length = 1; + for (i = 0; i < skipSize; i++) + DTable[i] = DElt; + } + + /* fill DTable */ + { U32 s; for (s=0; s= 1 */ + + rankVal[weight] += length; + } } +} + + +static void HUF_fillDTableX2(HUF_DEltX2* DTable, const U32 targetLog, + const sortedSymbol_t* sortedList, const U32 sortedListSize, + const U32* rankStart, rankVal_t rankValOrigin, const U32 maxWeight, + const U32 nbBitsBaseline, U32* wksp, size_t wkspSize) +{ + U32* rankVal = wksp; + const int scaleLog = nbBitsBaseline - targetLog; /* note : targetLog >= srcLog, hence scaleLog <= 1 */ + const U32 minBits = nbBitsBaseline - maxWeight; + U32 s; + + assert(wkspSize >= HUF_TABLELOG_MAX + 1); + wksp += HUF_TABLELOG_MAX + 1; + wkspSize -= HUF_TABLELOG_MAX + 1; + + ZSTD_memcpy(rankVal, rankValOrigin, sizeof(U32) * (HUF_TABLELOG_MAX + 1)); + + /* fill DTable */ + for (s=0; s= minBits) { /* enough room for a second symbol */ + U32 sortedRank; + int minWeight = nbBits + scaleLog; + if (minWeight < 1) minWeight = 1; + sortedRank = rankStart[minWeight]; + HUF_fillDTableX2Level2(DTable+start, targetLog-nbBits, nbBits, + rankValOrigin[nbBits], minWeight, + sortedList+sortedRank, sortedListSize-sortedRank, + nbBitsBaseline, symbol, wksp, wkspSize); + } else { + HUF_DEltX2 DElt; + MEM_writeLE16(&(DElt.sequence), symbol); + DElt.nbBits = (BYTE)(nbBits); + DElt.length = 1; + { U32 const end = start + length; + U32 u; + for (u = start; u < end; u++) DTable[u] = DElt; + } } + rankVal[weight] += length; + } +} + +typedef struct { + rankValCol_t rankVal[HUF_TABLELOG_MAX]; + U32 rankStats[HUF_TABLELOG_MAX + 1]; + U32 rankStart0[HUF_TABLELOG_MAX + 2]; + sortedSymbol_t sortedSymbol[HUF_SYMBOLVALUE_MAX + 1]; + BYTE weightList[HUF_SYMBOLVALUE_MAX + 1]; + U32 calleeWksp[HUF_READ_STATS_WORKSPACE_SIZE_U32]; +} HUF_ReadDTableX2_Workspace; + +size_t HUF_readDTableX2_wksp(HUF_DTable* DTable, + const void* src, size_t srcSize, + void* workSpace, size_t wkspSize) +{ + U32 tableLog, maxW, sizeOfSort, nbSymbols; + DTableDesc dtd = HUF_getDTableDesc(DTable); + U32 const maxTableLog = dtd.maxTableLog; + size_t iSize; + void* dtPtr = DTable+1; /* force compiler to avoid strict-aliasing */ + HUF_DEltX2* const dt = (HUF_DEltX2*)dtPtr; + U32 *rankStart; + + HUF_ReadDTableX2_Workspace* const wksp = (HUF_ReadDTableX2_Workspace*)workSpace; + + if (sizeof(*wksp) > wkspSize) return ERROR(GENERIC); + + rankStart = wksp->rankStart0 + 1; + ZSTD_memset(wksp->rankStats, 0, sizeof(wksp->rankStats)); + ZSTD_memset(wksp->rankStart0, 0, sizeof(wksp->rankStart0)); + + DEBUG_STATIC_ASSERT(sizeof(HUF_DEltX2) == sizeof(HUF_DTable)); /* if compiler fails here, assertion is wrong */ + if (maxTableLog > HUF_TABLELOG_MAX) return ERROR(tableLog_tooLarge); + /* ZSTD_memset(weightList, 0, sizeof(weightList)); */ /* is not necessary, even though some analyzer complain ... */ + + iSize = HUF_readStats_wksp(wksp->weightList, HUF_SYMBOLVALUE_MAX + 1, wksp->rankStats, &nbSymbols, &tableLog, src, srcSize, wksp->calleeWksp, sizeof(wksp->calleeWksp), /* bmi2 */ 0); + if (HUF_isError(iSize)) return iSize; + + /* check result */ + if (tableLog > maxTableLog) return ERROR(tableLog_tooLarge); /* DTable can't fit code depth */ + + /* find maxWeight */ + for (maxW = tableLog; wksp->rankStats[maxW]==0; maxW--) {} /* necessarily finds a solution before 0 */ + + /* Get start index of each weight */ + { U32 w, nextRankStart = 0; + for (w=1; wrankStats[w]; + rankStart[w] = curr; + } + rankStart[0] = nextRankStart; /* put all 0w symbols at the end of sorted list*/ + sizeOfSort = nextRankStart; + } + + /* sort symbols by weight */ + { U32 s; + for (s=0; sweightList[s]; + U32 const r = rankStart[w]++; + wksp->sortedSymbol[r].symbol = (BYTE)s; + wksp->sortedSymbol[r].weight = (BYTE)w; + } + rankStart[0] = 0; /* forget 0w symbols; this is beginning of weight(1) */ + } + + /* Build rankVal */ + { U32* const rankVal0 = wksp->rankVal[0]; + { int const rescale = (maxTableLog-tableLog) - 1; /* tableLog <= maxTableLog */ + U32 nextRankVal = 0; + U32 w; + for (w=1; wrankStats[w] << (w+rescale); + rankVal0[w] = curr; + } } + { U32 const minBits = tableLog+1 - maxW; + U32 consumed; + for (consumed = minBits; consumed < maxTableLog - minBits + 1; consumed++) { + U32* const rankValPtr = wksp->rankVal[consumed]; + U32 w; + for (w = 1; w < maxW+1; w++) { + rankValPtr[w] = rankVal0[w] >> consumed; + } } } } + + HUF_fillDTableX2(dt, maxTableLog, + wksp->sortedSymbol, sizeOfSort, + wksp->rankStart0, wksp->rankVal, maxW, + tableLog+1, + wksp->calleeWksp, sizeof(wksp->calleeWksp) / sizeof(U32)); + + dtd.tableLog = (BYTE)maxTableLog; + dtd.tableType = 1; + ZSTD_memcpy(DTable, &dtd, sizeof(dtd)); + return iSize; +} + + +FORCE_INLINE_TEMPLATE U32 +HUF_decodeSymbolX2(void* op, BIT_DStream_t* DStream, const HUF_DEltX2* dt, const U32 dtLog) +{ + size_t const val = BIT_lookBitsFast(DStream, dtLog); /* note : dtLog >= 1 */ + ZSTD_memcpy(op, dt+val, 2); + BIT_skipBits(DStream, dt[val].nbBits); + return dt[val].length; +} + +FORCE_INLINE_TEMPLATE U32 +HUF_decodeLastSymbolX2(void* op, BIT_DStream_t* DStream, const HUF_DEltX2* dt, const U32 dtLog) +{ + size_t const val = BIT_lookBitsFast(DStream, dtLog); /* note : dtLog >= 1 */ + ZSTD_memcpy(op, dt+val, 1); + if (dt[val].length==1) BIT_skipBits(DStream, dt[val].nbBits); + else { + if (DStream->bitsConsumed < (sizeof(DStream->bitContainer)*8)) { + BIT_skipBits(DStream, dt[val].nbBits); + if (DStream->bitsConsumed > (sizeof(DStream->bitContainer)*8)) + /* ugly hack; works only because it's the last symbol. Note : can't easily extract nbBits from just this symbol */ + DStream->bitsConsumed = (sizeof(DStream->bitContainer)*8); + } } + return 1; +} + +#define HUF_DECODE_SYMBOLX2_0(ptr, DStreamPtr) \ + ptr += HUF_decodeSymbolX2(ptr, DStreamPtr, dt, dtLog) + +#define HUF_DECODE_SYMBOLX2_1(ptr, DStreamPtr) \ + if (MEM_64bits() || (HUF_TABLELOG_MAX<=12)) \ + ptr += HUF_decodeSymbolX2(ptr, DStreamPtr, dt, dtLog) + +#define HUF_DECODE_SYMBOLX2_2(ptr, DStreamPtr) \ + if (MEM_64bits()) \ + ptr += HUF_decodeSymbolX2(ptr, DStreamPtr, dt, dtLog) + +HINT_INLINE size_t +HUF_decodeStreamX2(BYTE* p, BIT_DStream_t* bitDPtr, BYTE* const pEnd, + const HUF_DEltX2* const dt, const U32 dtLog) +{ + BYTE* const pStart = p; + + /* up to 8 symbols at a time */ + while ((BIT_reloadDStream(bitDPtr) == BIT_DStream_unfinished) & (p < pEnd-(sizeof(bitDPtr->bitContainer)-1))) { + HUF_DECODE_SYMBOLX2_2(p, bitDPtr); + HUF_DECODE_SYMBOLX2_1(p, bitDPtr); + HUF_DECODE_SYMBOLX2_2(p, bitDPtr); + HUF_DECODE_SYMBOLX2_0(p, bitDPtr); + } + + /* closer to end : up to 2 symbols at a time */ + while ((BIT_reloadDStream(bitDPtr) == BIT_DStream_unfinished) & (p <= pEnd-2)) + HUF_DECODE_SYMBOLX2_0(p, bitDPtr); + + while (p <= pEnd-2) + HUF_DECODE_SYMBOLX2_0(p, bitDPtr); /* no need to reload : reached the end of DStream */ + + if (p < pEnd) + p += HUF_decodeLastSymbolX2(p, bitDPtr, dt, dtLog); + + return p-pStart; +} + +FORCE_INLINE_TEMPLATE size_t +HUF_decompress1X2_usingDTable_internal_body( + void* dst, size_t dstSize, + const void* cSrc, size_t cSrcSize, + const HUF_DTable* DTable) +{ + BIT_DStream_t bitD; + + /* Init */ + CHECK_F( BIT_initDStream(&bitD, cSrc, cSrcSize) ); + + /* decode */ + { BYTE* const ostart = (BYTE*) dst; + BYTE* const oend = ostart + dstSize; + const void* const dtPtr = DTable+1; /* force compiler to not use strict-aliasing */ + const HUF_DEltX2* const dt = (const HUF_DEltX2*)dtPtr; + DTableDesc const dtd = HUF_getDTableDesc(DTable); + HUF_decodeStreamX2(ostart, &bitD, oend, dt, dtd.tableLog); + } + + /* check */ + if (!BIT_endOfDStream(&bitD)) return ERROR(corruption_detected); + + /* decoded size */ + return dstSize; +} + +FORCE_INLINE_TEMPLATE size_t +HUF_decompress4X2_usingDTable_internal_body( + void* dst, size_t dstSize, + const void* cSrc, size_t cSrcSize, + const HUF_DTable* DTable) +{ + if (cSrcSize < 10) return ERROR(corruption_detected); /* strict minimum : jump table + 1 byte per stream */ + + { const BYTE* const istart = (const BYTE*) cSrc; + BYTE* const ostart = (BYTE*) dst; + BYTE* const oend = ostart + dstSize; + BYTE* const olimit = oend - (sizeof(size_t)-1); + const void* const dtPtr = DTable+1; + const HUF_DEltX2* const dt = (const HUF_DEltX2*)dtPtr; + + /* Init */ + BIT_DStream_t bitD1; + BIT_DStream_t bitD2; + BIT_DStream_t bitD3; + BIT_DStream_t bitD4; + size_t const length1 = MEM_readLE16(istart); + size_t const length2 = MEM_readLE16(istart+2); + size_t const length3 = MEM_readLE16(istart+4); + size_t const length4 = cSrcSize - (length1 + length2 + length3 + 6); + const BYTE* const istart1 = istart + 6; /* jumpTable */ + const BYTE* const istart2 = istart1 + length1; + const BYTE* const istart3 = istart2 + length2; + const BYTE* const istart4 = istart3 + length3; + size_t const segmentSize = (dstSize+3) / 4; + BYTE* const opStart2 = ostart + segmentSize; + BYTE* const opStart3 = opStart2 + segmentSize; + BYTE* const opStart4 = opStart3 + segmentSize; + BYTE* op1 = ostart; + BYTE* op2 = opStart2; + BYTE* op3 = opStart3; + BYTE* op4 = opStart4; + U32 endSignal = 1; + DTableDesc const dtd = HUF_getDTableDesc(DTable); + U32 const dtLog = dtd.tableLog; + + if (length4 > cSrcSize) return ERROR(corruption_detected); /* overflow */ + CHECK_F( BIT_initDStream(&bitD1, istart1, length1) ); + CHECK_F( BIT_initDStream(&bitD2, istart2, length2) ); + CHECK_F( BIT_initDStream(&bitD3, istart3, length3) ); + CHECK_F( BIT_initDStream(&bitD4, istart4, length4) ); + + /* 16-32 symbols per loop (4-8 symbols per stream) */ + for ( ; (endSignal) & (op4 < olimit); ) { +#if defined(__clang__) && (defined(__x86_64__) || defined(__i386__)) + HUF_DECODE_SYMBOLX2_2(op1, &bitD1); + HUF_DECODE_SYMBOLX2_1(op1, &bitD1); + HUF_DECODE_SYMBOLX2_2(op1, &bitD1); + HUF_DECODE_SYMBOLX2_0(op1, &bitD1); + HUF_DECODE_SYMBOLX2_2(op2, &bitD2); + HUF_DECODE_SYMBOLX2_1(op2, &bitD2); + HUF_DECODE_SYMBOLX2_2(op2, &bitD2); + HUF_DECODE_SYMBOLX2_0(op2, &bitD2); + endSignal &= BIT_reloadDStreamFast(&bitD1) == BIT_DStream_unfinished; + endSignal &= BIT_reloadDStreamFast(&bitD2) == BIT_DStream_unfinished; + HUF_DECODE_SYMBOLX2_2(op3, &bitD3); + HUF_DECODE_SYMBOLX2_1(op3, &bitD3); + HUF_DECODE_SYMBOLX2_2(op3, &bitD3); + HUF_DECODE_SYMBOLX2_0(op3, &bitD3); + HUF_DECODE_SYMBOLX2_2(op4, &bitD4); + HUF_DECODE_SYMBOLX2_1(op4, &bitD4); + HUF_DECODE_SYMBOLX2_2(op4, &bitD4); + HUF_DECODE_SYMBOLX2_0(op4, &bitD4); + endSignal &= BIT_reloadDStreamFast(&bitD3) == BIT_DStream_unfinished; + endSignal &= BIT_reloadDStreamFast(&bitD4) == BIT_DStream_unfinished; +#else + HUF_DECODE_SYMBOLX2_2(op1, &bitD1); + HUF_DECODE_SYMBOLX2_2(op2, &bitD2); + HUF_DECODE_SYMBOLX2_2(op3, &bitD3); + HUF_DECODE_SYMBOLX2_2(op4, &bitD4); + HUF_DECODE_SYMBOLX2_1(op1, &bitD1); + HUF_DECODE_SYMBOLX2_1(op2, &bitD2); + HUF_DECODE_SYMBOLX2_1(op3, &bitD3); + HUF_DECODE_SYMBOLX2_1(op4, &bitD4); + HUF_DECODE_SYMBOLX2_2(op1, &bitD1); + HUF_DECODE_SYMBOLX2_2(op2, &bitD2); + HUF_DECODE_SYMBOLX2_2(op3, &bitD3); + HUF_DECODE_SYMBOLX2_2(op4, &bitD4); + HUF_DECODE_SYMBOLX2_0(op1, &bitD1); + HUF_DECODE_SYMBOLX2_0(op2, &bitD2); + HUF_DECODE_SYMBOLX2_0(op3, &bitD3); + HUF_DECODE_SYMBOLX2_0(op4, &bitD4); + endSignal = (U32)LIKELY( + (BIT_reloadDStreamFast(&bitD1) == BIT_DStream_unfinished) + & (BIT_reloadDStreamFast(&bitD2) == BIT_DStream_unfinished) + & (BIT_reloadDStreamFast(&bitD3) == BIT_DStream_unfinished) + & (BIT_reloadDStreamFast(&bitD4) == BIT_DStream_unfinished)); +#endif + } + + /* check corruption */ + if (op1 > opStart2) return ERROR(corruption_detected); + if (op2 > opStart3) return ERROR(corruption_detected); + if (op3 > opStart4) return ERROR(corruption_detected); + /* note : op4 already verified within main loop */ + + /* finish bitStreams one by one */ + HUF_decodeStreamX2(op1, &bitD1, opStart2, dt, dtLog); + HUF_decodeStreamX2(op2, &bitD2, opStart3, dt, dtLog); + HUF_decodeStreamX2(op3, &bitD3, opStart4, dt, dtLog); + HUF_decodeStreamX2(op4, &bitD4, oend, dt, dtLog); + + /* check */ + { U32 const endCheck = BIT_endOfDStream(&bitD1) & BIT_endOfDStream(&bitD2) & BIT_endOfDStream(&bitD3) & BIT_endOfDStream(&bitD4); + if (!endCheck) return ERROR(corruption_detected); } + + /* decoded size */ + return dstSize; + } +} + +HUF_DGEN(HUF_decompress1X2_usingDTable_internal) +HUF_DGEN(HUF_decompress4X2_usingDTable_internal) + +size_t HUF_decompress1X2_usingDTable( + void* dst, size_t dstSize, + const void* cSrc, size_t cSrcSize, + const HUF_DTable* DTable) +{ + DTableDesc dtd = HUF_getDTableDesc(DTable); + if (dtd.tableType != 1) return ERROR(GENERIC); + return HUF_decompress1X2_usingDTable_internal(dst, dstSize, cSrc, cSrcSize, DTable, /* bmi2 */ 0); +} + +size_t HUF_decompress1X2_DCtx_wksp(HUF_DTable* DCtx, void* dst, size_t dstSize, + const void* cSrc, size_t cSrcSize, + void* workSpace, size_t wkspSize) +{ + const BYTE* ip = (const BYTE*) cSrc; + + size_t const hSize = HUF_readDTableX2_wksp(DCtx, cSrc, cSrcSize, + workSpace, wkspSize); + if (HUF_isError(hSize)) return hSize; + if (hSize >= cSrcSize) return ERROR(srcSize_wrong); + ip += hSize; cSrcSize -= hSize; + + return HUF_decompress1X2_usingDTable_internal(dst, dstSize, ip, cSrcSize, DCtx, /* bmi2 */ 0); +} + + +size_t HUF_decompress4X2_usingDTable( + void* dst, size_t dstSize, + const void* cSrc, size_t cSrcSize, + const HUF_DTable* DTable) +{ + DTableDesc dtd = HUF_getDTableDesc(DTable); + if (dtd.tableType != 1) return ERROR(GENERIC); + return HUF_decompress4X2_usingDTable_internal(dst, dstSize, cSrc, cSrcSize, DTable, /* bmi2 */ 0); +} + +static size_t HUF_decompress4X2_DCtx_wksp_bmi2(HUF_DTable* dctx, void* dst, size_t dstSize, + const void* cSrc, size_t cSrcSize, + void* workSpace, size_t wkspSize, int bmi2) +{ + const BYTE* ip = (const BYTE*) cSrc; + + size_t hSize = HUF_readDTableX2_wksp(dctx, cSrc, cSrcSize, + workSpace, wkspSize); + if (HUF_isError(hSize)) return hSize; + if (hSize >= cSrcSize) return ERROR(srcSize_wrong); + ip += hSize; cSrcSize -= hSize; + + return HUF_decompress4X2_usingDTable_internal(dst, dstSize, ip, cSrcSize, dctx, bmi2); +} + +size_t HUF_decompress4X2_DCtx_wksp(HUF_DTable* dctx, void* dst, size_t dstSize, + const void* cSrc, size_t cSrcSize, + void* workSpace, size_t wkspSize) +{ + return HUF_decompress4X2_DCtx_wksp_bmi2(dctx, dst, dstSize, cSrc, cSrcSize, workSpace, wkspSize, /* bmi2 */ 0); +} + + +#endif /* HUF_FORCE_DECOMPRESS_X1 */ + + +/* ***********************************/ +/* Universal decompression selectors */ +/* ***********************************/ + +size_t HUF_decompress1X_usingDTable(void* dst, size_t maxDstSize, + const void* cSrc, size_t cSrcSize, + const HUF_DTable* DTable) +{ + DTableDesc const dtd = HUF_getDTableDesc(DTable); +#if defined(HUF_FORCE_DECOMPRESS_X1) + (void)dtd; + assert(dtd.tableType == 0); + return HUF_decompress1X1_usingDTable_internal(dst, maxDstSize, cSrc, cSrcSize, DTable, /* bmi2 */ 0); +#elif defined(HUF_FORCE_DECOMPRESS_X2) + (void)dtd; + assert(dtd.tableType == 1); + return HUF_decompress1X2_usingDTable_internal(dst, maxDstSize, cSrc, cSrcSize, DTable, /* bmi2 */ 0); +#else + return dtd.tableType ? HUF_decompress1X2_usingDTable_internal(dst, maxDstSize, cSrc, cSrcSize, DTable, /* bmi2 */ 0) : + HUF_decompress1X1_usingDTable_internal(dst, maxDstSize, cSrc, cSrcSize, DTable, /* bmi2 */ 0); +#endif +} + +size_t HUF_decompress4X_usingDTable(void* dst, size_t maxDstSize, + const void* cSrc, size_t cSrcSize, + const HUF_DTable* DTable) +{ + DTableDesc const dtd = HUF_getDTableDesc(DTable); +#if defined(HUF_FORCE_DECOMPRESS_X1) + (void)dtd; + assert(dtd.tableType == 0); + return HUF_decompress4X1_usingDTable_internal(dst, maxDstSize, cSrc, cSrcSize, DTable, /* bmi2 */ 0); +#elif defined(HUF_FORCE_DECOMPRESS_X2) + (void)dtd; + assert(dtd.tableType == 1); + return HUF_decompress4X2_usingDTable_internal(dst, maxDstSize, cSrc, cSrcSize, DTable, /* bmi2 */ 0); +#else + return dtd.tableType ? HUF_decompress4X2_usingDTable_internal(dst, maxDstSize, cSrc, cSrcSize, DTable, /* bmi2 */ 0) : + HUF_decompress4X1_usingDTable_internal(dst, maxDstSize, cSrc, cSrcSize, DTable, /* bmi2 */ 0); +#endif +} + + +#if !defined(HUF_FORCE_DECOMPRESS_X1) && !defined(HUF_FORCE_DECOMPRESS_X2) +typedef struct { U32 tableTime; U32 decode256Time; } algo_time_t; +static const algo_time_t algoTime[16 /* Quantization */][3 /* single, double, quad */] = +{ + /* single, double, quad */ + {{0,0}, {1,1}, {2,2}}, /* Q==0 : impossible */ + {{0,0}, {1,1}, {2,2}}, /* Q==1 : impossible */ + {{ 38,130}, {1313, 74}, {2151, 38}}, /* Q == 2 : 12-18% */ + {{ 448,128}, {1353, 74}, {2238, 41}}, /* Q == 3 : 18-25% */ + {{ 556,128}, {1353, 74}, {2238, 47}}, /* Q == 4 : 25-32% */ + {{ 714,128}, {1418, 74}, {2436, 53}}, /* Q == 5 : 32-38% */ + {{ 883,128}, {1437, 74}, {2464, 61}}, /* Q == 6 : 38-44% */ + {{ 897,128}, {1515, 75}, {2622, 68}}, /* Q == 7 : 44-50% */ + {{ 926,128}, {1613, 75}, {2730, 75}}, /* Q == 8 : 50-56% */ + {{ 947,128}, {1729, 77}, {3359, 77}}, /* Q == 9 : 56-62% */ + {{1107,128}, {2083, 81}, {4006, 84}}, /* Q ==10 : 62-69% */ + {{1177,128}, {2379, 87}, {4785, 88}}, /* Q ==11 : 69-75% */ + {{1242,128}, {2415, 93}, {5155, 84}}, /* Q ==12 : 75-81% */ + {{1349,128}, {2644,106}, {5260,106}}, /* Q ==13 : 81-87% */ + {{1455,128}, {2422,124}, {4174,124}}, /* Q ==14 : 87-93% */ + {{ 722,128}, {1891,145}, {1936,146}}, /* Q ==15 : 93-99% */ +}; +#endif + +/** HUF_selectDecoder() : + * Tells which decoder is likely to decode faster, + * based on a set of pre-computed metrics. + * @return : 0==HUF_decompress4X1, 1==HUF_decompress4X2 . + * Assumption : 0 < dstSize <= 128 KB */ +U32 HUF_selectDecoder (size_t dstSize, size_t cSrcSize) +{ + assert(dstSize > 0); + assert(dstSize <= 128*1024); +#if defined(HUF_FORCE_DECOMPRESS_X1) + (void)dstSize; + (void)cSrcSize; + return 0; +#elif defined(HUF_FORCE_DECOMPRESS_X2) + (void)dstSize; + (void)cSrcSize; + return 1; +#else + /* decoder timing evaluation */ + { U32 const Q = (cSrcSize >= dstSize) ? 15 : (U32)(cSrcSize * 16 / dstSize); /* Q < 16 */ + U32 const D256 = (U32)(dstSize >> 8); + U32 const DTime0 = algoTime[Q][0].tableTime + (algoTime[Q][0].decode256Time * D256); + U32 DTime1 = algoTime[Q][1].tableTime + (algoTime[Q][1].decode256Time * D256); + DTime1 += DTime1 >> 3; /* advantage to algorithm using less memory, to reduce cache eviction */ + return DTime1 < DTime0; + } +#endif +} + + +size_t HUF_decompress4X_hufOnly_wksp(HUF_DTable* dctx, void* dst, + size_t dstSize, const void* cSrc, + size_t cSrcSize, void* workSpace, + size_t wkspSize) +{ + /* validation checks */ + if (dstSize == 0) return ERROR(dstSize_tooSmall); + if (cSrcSize == 0) return ERROR(corruption_detected); + + { U32 const algoNb = HUF_selectDecoder(dstSize, cSrcSize); +#if defined(HUF_FORCE_DECOMPRESS_X1) + (void)algoNb; + assert(algoNb == 0); + return HUF_decompress4X1_DCtx_wksp(dctx, dst, dstSize, cSrc, cSrcSize, workSpace, wkspSize); +#elif defined(HUF_FORCE_DECOMPRESS_X2) + (void)algoNb; + assert(algoNb == 1); + return HUF_decompress4X2_DCtx_wksp(dctx, dst, dstSize, cSrc, cSrcSize, workSpace, wkspSize); +#else + return algoNb ? HUF_decompress4X2_DCtx_wksp(dctx, dst, dstSize, cSrc, + cSrcSize, workSpace, wkspSize): + HUF_decompress4X1_DCtx_wksp(dctx, dst, dstSize, cSrc, cSrcSize, workSpace, wkspSize); +#endif + } +} + +size_t HUF_decompress1X_DCtx_wksp(HUF_DTable* dctx, void* dst, size_t dstSize, + const void* cSrc, size_t cSrcSize, + void* workSpace, size_t wkspSize) +{ + /* validation checks */ + if (dstSize == 0) return ERROR(dstSize_tooSmall); + if (cSrcSize > dstSize) return ERROR(corruption_detected); /* invalid */ + if (cSrcSize == dstSize) { ZSTD_memcpy(dst, cSrc, dstSize); return dstSize; } /* not compressed */ + if (cSrcSize == 1) { ZSTD_memset(dst, *(const BYTE*)cSrc, dstSize); return dstSize; } /* RLE */ + + { U32 const algoNb = HUF_selectDecoder(dstSize, cSrcSize); +#if defined(HUF_FORCE_DECOMPRESS_X1) + (void)algoNb; + assert(algoNb == 0); + return HUF_decompress1X1_DCtx_wksp(dctx, dst, dstSize, cSrc, + cSrcSize, workSpace, wkspSize); +#elif defined(HUF_FORCE_DECOMPRESS_X2) + (void)algoNb; + assert(algoNb == 1); + return HUF_decompress1X2_DCtx_wksp(dctx, dst, dstSize, cSrc, + cSrcSize, workSpace, wkspSize); +#else + return algoNb ? HUF_decompress1X2_DCtx_wksp(dctx, dst, dstSize, cSrc, + cSrcSize, workSpace, wkspSize): + HUF_decompress1X1_DCtx_wksp(dctx, dst, dstSize, cSrc, + cSrcSize, workSpace, wkspSize); +#endif + } +} + + +size_t HUF_decompress1X_usingDTable_bmi2(void* dst, size_t maxDstSize, const void* cSrc, size_t cSrcSize, const HUF_DTable* DTable, int bmi2) +{ + DTableDesc const dtd = HUF_getDTableDesc(DTable); +#if defined(HUF_FORCE_DECOMPRESS_X1) + (void)dtd; + assert(dtd.tableType == 0); + return HUF_decompress1X1_usingDTable_internal(dst, maxDstSize, cSrc, cSrcSize, DTable, bmi2); +#elif defined(HUF_FORCE_DECOMPRESS_X2) + (void)dtd; + assert(dtd.tableType == 1); + return HUF_decompress1X2_usingDTable_internal(dst, maxDstSize, cSrc, cSrcSize, DTable, bmi2); +#else + return dtd.tableType ? HUF_decompress1X2_usingDTable_internal(dst, maxDstSize, cSrc, cSrcSize, DTable, bmi2) : + HUF_decompress1X1_usingDTable_internal(dst, maxDstSize, cSrc, cSrcSize, DTable, bmi2); +#endif +} + +#ifndef HUF_FORCE_DECOMPRESS_X2 +size_t HUF_decompress1X1_DCtx_wksp_bmi2(HUF_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize, void* workSpace, size_t wkspSize, int bmi2) +{ + const BYTE* ip = (const BYTE*) cSrc; + + size_t const hSize = HUF_readDTableX1_wksp_bmi2(dctx, cSrc, cSrcSize, workSpace, wkspSize, bmi2); + if (HUF_isError(hSize)) return hSize; + if (hSize >= cSrcSize) return ERROR(srcSize_wrong); + ip += hSize; cSrcSize -= hSize; + + return HUF_decompress1X1_usingDTable_internal(dst, dstSize, ip, cSrcSize, dctx, bmi2); +} +#endif + +size_t HUF_decompress4X_usingDTable_bmi2(void* dst, size_t maxDstSize, const void* cSrc, size_t cSrcSize, const HUF_DTable* DTable, int bmi2) +{ + DTableDesc const dtd = HUF_getDTableDesc(DTable); +#if defined(HUF_FORCE_DECOMPRESS_X1) + (void)dtd; + assert(dtd.tableType == 0); + return HUF_decompress4X1_usingDTable_internal(dst, maxDstSize, cSrc, cSrcSize, DTable, bmi2); +#elif defined(HUF_FORCE_DECOMPRESS_X2) + (void)dtd; + assert(dtd.tableType == 1); + return HUF_decompress4X2_usingDTable_internal(dst, maxDstSize, cSrc, cSrcSize, DTable, bmi2); +#else + return dtd.tableType ? HUF_decompress4X2_usingDTable_internal(dst, maxDstSize, cSrc, cSrcSize, DTable, bmi2) : + HUF_decompress4X1_usingDTable_internal(dst, maxDstSize, cSrc, cSrcSize, DTable, bmi2); +#endif +} + +size_t HUF_decompress4X_hufOnly_wksp_bmi2(HUF_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize, void* workSpace, size_t wkspSize, int bmi2) +{ + /* validation checks */ + if (dstSize == 0) return ERROR(dstSize_tooSmall); + if (cSrcSize == 0) return ERROR(corruption_detected); + + { U32 const algoNb = HUF_selectDecoder(dstSize, cSrcSize); +#if defined(HUF_FORCE_DECOMPRESS_X1) + (void)algoNb; + assert(algoNb == 0); + return HUF_decompress4X1_DCtx_wksp_bmi2(dctx, dst, dstSize, cSrc, cSrcSize, workSpace, wkspSize, bmi2); +#elif defined(HUF_FORCE_DECOMPRESS_X2) + (void)algoNb; + assert(algoNb == 1); + return HUF_decompress4X2_DCtx_wksp_bmi2(dctx, dst, dstSize, cSrc, cSrcSize, workSpace, wkspSize, bmi2); +#else + return algoNb ? HUF_decompress4X2_DCtx_wksp_bmi2(dctx, dst, dstSize, cSrc, cSrcSize, workSpace, wkspSize, bmi2) : + HUF_decompress4X1_DCtx_wksp_bmi2(dctx, dst, dstSize, cSrc, cSrcSize, workSpace, wkspSize, bmi2); +#endif + } +} + +#ifndef ZSTD_NO_UNUSED_FUNCTIONS +#ifndef HUF_FORCE_DECOMPRESS_X2 +size_t HUF_readDTableX1(HUF_DTable* DTable, const void* src, size_t srcSize) +{ + U32 workSpace[HUF_DECOMPRESS_WORKSPACE_SIZE_U32]; + return HUF_readDTableX1_wksp(DTable, src, srcSize, + workSpace, sizeof(workSpace)); +} + +size_t HUF_decompress1X1_DCtx(HUF_DTable* DCtx, void* dst, size_t dstSize, + const void* cSrc, size_t cSrcSize) +{ + U32 workSpace[HUF_DECOMPRESS_WORKSPACE_SIZE_U32]; + return HUF_decompress1X1_DCtx_wksp(DCtx, dst, dstSize, cSrc, cSrcSize, + workSpace, sizeof(workSpace)); +} + +size_t HUF_decompress1X1 (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize) +{ + HUF_CREATE_STATIC_DTABLEX1(DTable, HUF_TABLELOG_MAX); + return HUF_decompress1X1_DCtx (DTable, dst, dstSize, cSrc, cSrcSize); +} +#endif + +#ifndef HUF_FORCE_DECOMPRESS_X1 +size_t HUF_readDTableX2(HUF_DTable* DTable, const void* src, size_t srcSize) +{ + U32 workSpace[HUF_DECOMPRESS_WORKSPACE_SIZE_U32]; + return HUF_readDTableX2_wksp(DTable, src, srcSize, + workSpace, sizeof(workSpace)); +} + +size_t HUF_decompress1X2_DCtx(HUF_DTable* DCtx, void* dst, size_t dstSize, + const void* cSrc, size_t cSrcSize) +{ + U32 workSpace[HUF_DECOMPRESS_WORKSPACE_SIZE_U32]; + return HUF_decompress1X2_DCtx_wksp(DCtx, dst, dstSize, cSrc, cSrcSize, + workSpace, sizeof(workSpace)); +} + +size_t HUF_decompress1X2 (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize) +{ + HUF_CREATE_STATIC_DTABLEX2(DTable, HUF_TABLELOG_MAX); + return HUF_decompress1X2_DCtx(DTable, dst, dstSize, cSrc, cSrcSize); +} +#endif + +#ifndef HUF_FORCE_DECOMPRESS_X2 +size_t HUF_decompress4X1_DCtx (HUF_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize) +{ + U32 workSpace[HUF_DECOMPRESS_WORKSPACE_SIZE_U32]; + return HUF_decompress4X1_DCtx_wksp(dctx, dst, dstSize, cSrc, cSrcSize, + workSpace, sizeof(workSpace)); +} +size_t HUF_decompress4X1 (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize) +{ + HUF_CREATE_STATIC_DTABLEX1(DTable, HUF_TABLELOG_MAX); + return HUF_decompress4X1_DCtx(DTable, dst, dstSize, cSrc, cSrcSize); +} +#endif + +#ifndef HUF_FORCE_DECOMPRESS_X1 +size_t HUF_decompress4X2_DCtx(HUF_DTable* dctx, void* dst, size_t dstSize, + const void* cSrc, size_t cSrcSize) +{ + U32 workSpace[HUF_DECOMPRESS_WORKSPACE_SIZE_U32]; + return HUF_decompress4X2_DCtx_wksp(dctx, dst, dstSize, cSrc, cSrcSize, + workSpace, sizeof(workSpace)); +} + +size_t HUF_decompress4X2 (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize) +{ + HUF_CREATE_STATIC_DTABLEX2(DTable, HUF_TABLELOG_MAX); + return HUF_decompress4X2_DCtx(DTable, dst, dstSize, cSrc, cSrcSize); +} +#endif + +typedef size_t (*decompressionAlgo)(void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); + +size_t HUF_decompress (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize) +{ +#if !defined(HUF_FORCE_DECOMPRESS_X1) && !defined(HUF_FORCE_DECOMPRESS_X2) + static const decompressionAlgo decompress[2] = { HUF_decompress4X1, HUF_decompress4X2 }; +#endif + + /* validation checks */ + if (dstSize == 0) return ERROR(dstSize_tooSmall); + if (cSrcSize > dstSize) return ERROR(corruption_detected); /* invalid */ + if (cSrcSize == dstSize) { ZSTD_memcpy(dst, cSrc, dstSize); return dstSize; } /* not compressed */ + if (cSrcSize == 1) { ZSTD_memset(dst, *(const BYTE*)cSrc, dstSize); return dstSize; } /* RLE */ + + { U32 const algoNb = HUF_selectDecoder(dstSize, cSrcSize); +#if defined(HUF_FORCE_DECOMPRESS_X1) + (void)algoNb; + assert(algoNb == 0); + return HUF_decompress4X1(dst, dstSize, cSrc, cSrcSize); +#elif defined(HUF_FORCE_DECOMPRESS_X2) + (void)algoNb; + assert(algoNb == 1); + return HUF_decompress4X2(dst, dstSize, cSrc, cSrcSize); +#else + return decompress[algoNb](dst, dstSize, cSrc, cSrcSize); +#endif + } +} + +size_t HUF_decompress4X_DCtx (HUF_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize) +{ + /* validation checks */ + if (dstSize == 0) return ERROR(dstSize_tooSmall); + if (cSrcSize > dstSize) return ERROR(corruption_detected); /* invalid */ + if (cSrcSize == dstSize) { ZSTD_memcpy(dst, cSrc, dstSize); return dstSize; } /* not compressed */ + if (cSrcSize == 1) { ZSTD_memset(dst, *(const BYTE*)cSrc, dstSize); return dstSize; } /* RLE */ + + { U32 const algoNb = HUF_selectDecoder(dstSize, cSrcSize); +#if defined(HUF_FORCE_DECOMPRESS_X1) + (void)algoNb; + assert(algoNb == 0); + return HUF_decompress4X1_DCtx(dctx, dst, dstSize, cSrc, cSrcSize); +#elif defined(HUF_FORCE_DECOMPRESS_X2) + (void)algoNb; + assert(algoNb == 1); + return HUF_decompress4X2_DCtx(dctx, dst, dstSize, cSrc, cSrcSize); +#else + return algoNb ? HUF_decompress4X2_DCtx(dctx, dst, dstSize, cSrc, cSrcSize) : + HUF_decompress4X1_DCtx(dctx, dst, dstSize, cSrc, cSrcSize) ; +#endif + } +} + +size_t HUF_decompress4X_hufOnly(HUF_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize) +{ + U32 workSpace[HUF_DECOMPRESS_WORKSPACE_SIZE_U32]; + return HUF_decompress4X_hufOnly_wksp(dctx, dst, dstSize, cSrc, cSrcSize, + workSpace, sizeof(workSpace)); +} + +size_t HUF_decompress1X_DCtx(HUF_DTable* dctx, void* dst, size_t dstSize, + const void* cSrc, size_t cSrcSize) +{ + U32 workSpace[HUF_DECOMPRESS_WORKSPACE_SIZE_U32]; + return HUF_decompress1X_DCtx_wksp(dctx, dst, dstSize, cSrc, cSrcSize, + workSpace, sizeof(workSpace)); +} +#endif diff --git a/external/zstd/lib/decompress/huf_decompress_amd64.S b/external/zstd/lib/decompress/huf_decompress_amd64.S new file mode 100644 index 00000000..98173cce --- /dev/null +++ b/external/zstd/lib/decompress/huf_decompress_amd64.S @@ -0,0 +1,571 @@ +#include "../common/portability_macros.h" + +#if ZSTD_ENABLE_ASM_X86_64_BMI2 + +/* Stack marking + * ref: https://wiki.gentoo.org/wiki/Hardened/GNU_stack_quickstart + */ +#if defined(__linux__) && defined(__ELF__) +.section .note.GNU-stack,"",%progbits +#endif + +/* Calling convention: + * + * %rdi contains the first argument: HUF_DecompressAsmArgs*. + * %rbp isn't maintained (no frame pointer). + * %rsp contains the stack pointer that grows down. + * No red-zone is assumed, only addresses >= %rsp are used. + * All register contents are preserved. + * + * TODO: Support Windows calling convention. + */ + +.global HUF_decompress4X1_usingDTable_internal_bmi2_asm_loop +.global HUF_decompress4X2_usingDTable_internal_bmi2_asm_loop +.global _HUF_decompress4X1_usingDTable_internal_bmi2_asm_loop +.global _HUF_decompress4X2_usingDTable_internal_bmi2_asm_loop +.text + +/* Sets up register mappings for clarity. + * op[], bits[], dtable & ip[0] each get their own register. + * ip[1,2,3] & olimit alias var[]. + * %rax is a scratch register. + */ + +#define op0 rsi +#define op1 rbx +#define op2 rcx +#define op3 rdi + +#define ip0 r8 +#define ip1 r9 +#define ip2 r10 +#define ip3 r11 + +#define bits0 rbp +#define bits1 rdx +#define bits2 r12 +#define bits3 r13 +#define dtable r14 +#define olimit r15 + +/* var[] aliases ip[1,2,3] & olimit + * ip[1,2,3] are saved every iteration. + * olimit is only used in compute_olimit. + */ +#define var0 r15 +#define var1 r9 +#define var2 r10 +#define var3 r11 + +/* 32-bit var registers */ +#define vard0 r15d +#define vard1 r9d +#define vard2 r10d +#define vard3 r11d + +/* Calls X(N) for each stream 0, 1, 2, 3. */ +#define FOR_EACH_STREAM(X) \ + X(0); \ + X(1); \ + X(2); \ + X(3) + +/* Calls X(N, idx) for each stream 0, 1, 2, 3. */ +#define FOR_EACH_STREAM_WITH_INDEX(X, idx) \ + X(0, idx); \ + X(1, idx); \ + X(2, idx); \ + X(3, idx) + +/* Define both _HUF_* & HUF_* symbols because MacOS + * C symbols are prefixed with '_' & Linux symbols aren't. + */ +_HUF_decompress4X1_usingDTable_internal_bmi2_asm_loop: +HUF_decompress4X1_usingDTable_internal_bmi2_asm_loop: + /* Save all registers - even if they are callee saved for simplicity. */ + push %rax + push %rbx + push %rcx + push %rdx + push %rbp + push %rsi + push %rdi + push %r8 + push %r9 + push %r10 + push %r11 + push %r12 + push %r13 + push %r14 + push %r15 + + /* Read HUF_DecompressAsmArgs* args from %rax */ + movq %rdi, %rax + movq 0(%rax), %ip0 + movq 8(%rax), %ip1 + movq 16(%rax), %ip2 + movq 24(%rax), %ip3 + movq 32(%rax), %op0 + movq 40(%rax), %op1 + movq 48(%rax), %op2 + movq 56(%rax), %op3 + movq 64(%rax), %bits0 + movq 72(%rax), %bits1 + movq 80(%rax), %bits2 + movq 88(%rax), %bits3 + movq 96(%rax), %dtable + push %rax /* argument */ + push 104(%rax) /* ilimit */ + push 112(%rax) /* oend */ + push %olimit /* olimit space */ + + subq $24, %rsp + +.L_4X1_compute_olimit: + /* Computes how many iterations we can do safely + * %r15, %rax may be clobbered + * rbx, rdx must be saved + * op3 & ip0 mustn't be clobbered + */ + movq %rbx, 0(%rsp) + movq %rdx, 8(%rsp) + + movq 32(%rsp), %rax /* rax = oend */ + subq %op3, %rax /* rax = oend - op3 */ + + /* r15 = (oend - op3) / 5 */ + movabsq $-3689348814741910323, %rdx + mulq %rdx + movq %rdx, %r15 + shrq $2, %r15 + + movq %ip0, %rax /* rax = ip0 */ + movq 40(%rsp), %rdx /* rdx = ilimit */ + subq %rdx, %rax /* rax = ip0 - ilimit */ + movq %rax, %rbx /* rbx = ip0 - ilimit */ + + /* rdx = (ip0 - ilimit) / 7 */ + movabsq $2635249153387078803, %rdx + mulq %rdx + subq %rdx, %rbx + shrq %rbx + addq %rbx, %rdx + shrq $2, %rdx + + /* r15 = min(%rdx, %r15) */ + cmpq %rdx, %r15 + cmova %rdx, %r15 + + /* r15 = r15 * 5 */ + leaq (%r15, %r15, 4), %r15 + + /* olimit = op3 + r15 */ + addq %op3, %olimit + + movq 8(%rsp), %rdx + movq 0(%rsp), %rbx + + /* If (op3 + 20 > olimit) */ + movq %op3, %rax /* rax = op3 */ + addq $20, %rax /* rax = op3 + 20 */ + cmpq %rax, %olimit /* op3 + 20 > olimit */ + jb .L_4X1_exit + + /* If (ip1 < ip0) go to exit */ + cmpq %ip0, %ip1 + jb .L_4X1_exit + + /* If (ip2 < ip1) go to exit */ + cmpq %ip1, %ip2 + jb .L_4X1_exit + + /* If (ip3 < ip2) go to exit */ + cmpq %ip2, %ip3 + jb .L_4X1_exit + +/* Reads top 11 bits from bits[n] + * Loads dt[bits[n]] into var[n] + */ +#define GET_NEXT_DELT(n) \ + movq $53, %var##n; \ + shrxq %var##n, %bits##n, %var##n; \ + movzwl (%dtable,%var##n,2),%vard##n + +/* var[n] must contain the DTable entry computed with GET_NEXT_DELT + * Moves var[n] to %rax + * bits[n] <<= var[n] & 63 + * op[n][idx] = %rax >> 8 + * %ah is a way to access bits [8, 16) of %rax + */ +#define DECODE_FROM_DELT(n, idx) \ + movq %var##n, %rax; \ + shlxq %var##n, %bits##n, %bits##n; \ + movb %ah, idx(%op##n) + +/* Assumes GET_NEXT_DELT has been called. + * Calls DECODE_FROM_DELT then GET_NEXT_DELT + */ +#define DECODE_AND_GET_NEXT(n, idx) \ + DECODE_FROM_DELT(n, idx); \ + GET_NEXT_DELT(n) \ + +/* // ctz & nbBytes is stored in bits[n] + * // nbBits is stored in %rax + * ctz = CTZ[bits[n]] + * nbBits = ctz & 7 + * nbBytes = ctz >> 3 + * op[n] += 5 + * ip[n] -= nbBytes + * // Note: x86-64 is little-endian ==> no bswap + * bits[n] = MEM_readST(ip[n]) | 1 + * bits[n] <<= nbBits + */ +#define RELOAD_BITS(n) \ + bsfq %bits##n, %bits##n; \ + movq %bits##n, %rax; \ + andq $7, %rax; \ + shrq $3, %bits##n; \ + leaq 5(%op##n), %op##n; \ + subq %bits##n, %ip##n; \ + movq (%ip##n), %bits##n; \ + orq $1, %bits##n; \ + shlx %rax, %bits##n, %bits##n + + /* Store clobbered variables on the stack */ + movq %olimit, 24(%rsp) + movq %ip1, 0(%rsp) + movq %ip2, 8(%rsp) + movq %ip3, 16(%rsp) + + /* Call GET_NEXT_DELT for each stream */ + FOR_EACH_STREAM(GET_NEXT_DELT) + + .p2align 6 + +.L_4X1_loop_body: + /* Decode 5 symbols in each of the 4 streams (20 total) + * Must have called GET_NEXT_DELT for each stream + */ + FOR_EACH_STREAM_WITH_INDEX(DECODE_AND_GET_NEXT, 0) + FOR_EACH_STREAM_WITH_INDEX(DECODE_AND_GET_NEXT, 1) + FOR_EACH_STREAM_WITH_INDEX(DECODE_AND_GET_NEXT, 2) + FOR_EACH_STREAM_WITH_INDEX(DECODE_AND_GET_NEXT, 3) + FOR_EACH_STREAM_WITH_INDEX(DECODE_FROM_DELT, 4) + + /* Load ip[1,2,3] from stack (var[] aliases them) + * ip[] is needed for RELOAD_BITS + * Each will be stored back to the stack after RELOAD + */ + movq 0(%rsp), %ip1 + movq 8(%rsp), %ip2 + movq 16(%rsp), %ip3 + + /* Reload each stream & fetch the next table entry + * to prepare for the next iteration + */ + RELOAD_BITS(0) + GET_NEXT_DELT(0) + + RELOAD_BITS(1) + movq %ip1, 0(%rsp) + GET_NEXT_DELT(1) + + RELOAD_BITS(2) + movq %ip2, 8(%rsp) + GET_NEXT_DELT(2) + + RELOAD_BITS(3) + movq %ip3, 16(%rsp) + GET_NEXT_DELT(3) + + /* If op3 < olimit: continue the loop */ + cmp %op3, 24(%rsp) + ja .L_4X1_loop_body + + /* Reload ip[1,2,3] from stack */ + movq 0(%rsp), %ip1 + movq 8(%rsp), %ip2 + movq 16(%rsp), %ip3 + + /* Re-compute olimit */ + jmp .L_4X1_compute_olimit + +#undef GET_NEXT_DELT +#undef DECODE_FROM_DELT +#undef DECODE +#undef RELOAD_BITS +.L_4X1_exit: + addq $24, %rsp + + /* Restore stack (oend & olimit) */ + pop %rax /* olimit */ + pop %rax /* oend */ + pop %rax /* ilimit */ + pop %rax /* arg */ + + /* Save ip / op / bits */ + movq %ip0, 0(%rax) + movq %ip1, 8(%rax) + movq %ip2, 16(%rax) + movq %ip3, 24(%rax) + movq %op0, 32(%rax) + movq %op1, 40(%rax) + movq %op2, 48(%rax) + movq %op3, 56(%rax) + movq %bits0, 64(%rax) + movq %bits1, 72(%rax) + movq %bits2, 80(%rax) + movq %bits3, 88(%rax) + + /* Restore registers */ + pop %r15 + pop %r14 + pop %r13 + pop %r12 + pop %r11 + pop %r10 + pop %r9 + pop %r8 + pop %rdi + pop %rsi + pop %rbp + pop %rdx + pop %rcx + pop %rbx + pop %rax + ret + +_HUF_decompress4X2_usingDTable_internal_bmi2_asm_loop: +HUF_decompress4X2_usingDTable_internal_bmi2_asm_loop: + /* Save all registers - even if they are callee saved for simplicity. */ + push %rax + push %rbx + push %rcx + push %rdx + push %rbp + push %rsi + push %rdi + push %r8 + push %r9 + push %r10 + push %r11 + push %r12 + push %r13 + push %r14 + push %r15 + + movq %rdi, %rax + movq 0(%rax), %ip0 + movq 8(%rax), %ip1 + movq 16(%rax), %ip2 + movq 24(%rax), %ip3 + movq 32(%rax), %op0 + movq 40(%rax), %op1 + movq 48(%rax), %op2 + movq 56(%rax), %op3 + movq 64(%rax), %bits0 + movq 72(%rax), %bits1 + movq 80(%rax), %bits2 + movq 88(%rax), %bits3 + movq 96(%rax), %dtable + push %rax /* argument */ + push %rax /* olimit */ + push 104(%rax) /* ilimit */ + + movq 112(%rax), %rax + push %rax /* oend3 */ + + movq %op3, %rax + push %rax /* oend2 */ + + movq %op2, %rax + push %rax /* oend1 */ + + movq %op1, %rax + push %rax /* oend0 */ + + /* Scratch space */ + subq $8, %rsp + +.L_4X2_compute_olimit: + /* Computes how many iterations we can do safely + * %r15, %rax may be clobbered + * rdx must be saved + * op[1,2,3,4] & ip0 mustn't be clobbered + */ + movq %rdx, 0(%rsp) + + /* We can consume up to 7 input bytes each iteration. */ + movq %ip0, %rax /* rax = ip0 */ + movq 40(%rsp), %rdx /* rdx = ilimit */ + subq %rdx, %rax /* rax = ip0 - ilimit */ + movq %rax, %r15 /* r15 = ip0 - ilimit */ + + /* rdx = rax / 7 */ + movabsq $2635249153387078803, %rdx + mulq %rdx + subq %rdx, %r15 + shrq %r15 + addq %r15, %rdx + shrq $2, %rdx + + /* r15 = (ip0 - ilimit) / 7 */ + movq %rdx, %r15 + + movabsq $-3689348814741910323, %rdx + movq 8(%rsp), %rax /* rax = oend0 */ + subq %op0, %rax /* rax = oend0 - op0 */ + mulq %rdx + shrq $3, %rdx /* rdx = rax / 10 */ + + /* r15 = min(%rdx, %r15) */ + cmpq %rdx, %r15 + cmova %rdx, %r15 + + movabsq $-3689348814741910323, %rdx + movq 16(%rsp), %rax /* rax = oend1 */ + subq %op1, %rax /* rax = oend1 - op1 */ + mulq %rdx + shrq $3, %rdx /* rdx = rax / 10 */ + + /* r15 = min(%rdx, %r15) */ + cmpq %rdx, %r15 + cmova %rdx, %r15 + + movabsq $-3689348814741910323, %rdx + movq 24(%rsp), %rax /* rax = oend2 */ + subq %op2, %rax /* rax = oend2 - op2 */ + mulq %rdx + shrq $3, %rdx /* rdx = rax / 10 */ + + /* r15 = min(%rdx, %r15) */ + cmpq %rdx, %r15 + cmova %rdx, %r15 + + movabsq $-3689348814741910323, %rdx + movq 32(%rsp), %rax /* rax = oend3 */ + subq %op3, %rax /* rax = oend3 - op3 */ + mulq %rdx + shrq $3, %rdx /* rdx = rax / 10 */ + + /* r15 = min(%rdx, %r15) */ + cmpq %rdx, %r15 + cmova %rdx, %r15 + + /* olimit = op3 + 5 * r15 */ + movq %r15, %rax + leaq (%op3, %rax, 4), %olimit + addq %rax, %olimit + + movq 0(%rsp), %rdx + + /* If (op3 + 10 > olimit) */ + movq %op3, %rax /* rax = op3 */ + addq $10, %rax /* rax = op3 + 10 */ + cmpq %rax, %olimit /* op3 + 10 > olimit */ + jb .L_4X2_exit + + /* If (ip1 < ip0) go to exit */ + cmpq %ip0, %ip1 + jb .L_4X2_exit + + /* If (ip2 < ip1) go to exit */ + cmpq %ip1, %ip2 + jb .L_4X2_exit + + /* If (ip3 < ip2) go to exit */ + cmpq %ip2, %ip3 + jb .L_4X2_exit + +#define DECODE(n, idx) \ + movq %bits##n, %rax; \ + shrq $53, %rax; \ + movzwl 0(%dtable,%rax,4),%r8d; \ + movzbl 2(%dtable,%rax,4),%r15d; \ + movzbl 3(%dtable,%rax,4),%eax; \ + movw %r8w, (%op##n); \ + shlxq %r15, %bits##n, %bits##n; \ + addq %rax, %op##n + +#define RELOAD_BITS(n) \ + bsfq %bits##n, %bits##n; \ + movq %bits##n, %rax; \ + shrq $3, %bits##n; \ + andq $7, %rax; \ + subq %bits##n, %ip##n; \ + movq (%ip##n), %bits##n; \ + orq $1, %bits##n; \ + shlxq %rax, %bits##n, %bits##n + + + movq %olimit, 48(%rsp) + + .p2align 6 + +.L_4X2_loop_body: + /* We clobber r8, so store it on the stack */ + movq %r8, 0(%rsp) + + /* Decode 5 symbols from each of the 4 streams (20 symbols total). */ + FOR_EACH_STREAM_WITH_INDEX(DECODE, 0) + FOR_EACH_STREAM_WITH_INDEX(DECODE, 1) + FOR_EACH_STREAM_WITH_INDEX(DECODE, 2) + FOR_EACH_STREAM_WITH_INDEX(DECODE, 3) + FOR_EACH_STREAM_WITH_INDEX(DECODE, 4) + + /* Reload r8 */ + movq 0(%rsp), %r8 + + FOR_EACH_STREAM(RELOAD_BITS) + + cmp %op3, 48(%rsp) + ja .L_4X2_loop_body + jmp .L_4X2_compute_olimit + +#undef DECODE +#undef RELOAD_BITS +.L_4X2_exit: + addq $8, %rsp + /* Restore stack (oend & olimit) */ + pop %rax /* oend0 */ + pop %rax /* oend1 */ + pop %rax /* oend2 */ + pop %rax /* oend3 */ + pop %rax /* ilimit */ + pop %rax /* olimit */ + pop %rax /* arg */ + + /* Save ip / op / bits */ + movq %ip0, 0(%rax) + movq %ip1, 8(%rax) + movq %ip2, 16(%rax) + movq %ip3, 24(%rax) + movq %op0, 32(%rax) + movq %op1, 40(%rax) + movq %op2, 48(%rax) + movq %op3, 56(%rax) + movq %bits0, 64(%rax) + movq %bits1, 72(%rax) + movq %bits2, 80(%rax) + movq %bits3, 88(%rax) + + /* Restore registers */ + pop %r15 + pop %r14 + pop %r13 + pop %r12 + pop %r11 + pop %r10 + pop %r9 + pop %r8 + pop %rdi + pop %rsi + pop %rbp + pop %rdx + pop %rcx + pop %rbx + pop %rax + ret + +#endif diff --git a/external/zstd/lib/decompress/zstd_ddict.c b/external/zstd/lib/decompress/zstd_ddict.c new file mode 100644 index 00000000..ce335477 --- /dev/null +++ b/external/zstd/lib/decompress/zstd_ddict.c @@ -0,0 +1,244 @@ +/* + * Copyright (c) Yann Collet, Facebook, Inc. + * All rights reserved. + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. + */ + +/* zstd_ddict.c : + * concentrates all logic that needs to know the internals of ZSTD_DDict object */ + +/*-******************************************************* +* Dependencies +*********************************************************/ +#include "../common/zstd_deps.h" /* ZSTD_memcpy, ZSTD_memmove, ZSTD_memset */ +#include "../common/cpu.h" /* bmi2 */ +#include "../common/mem.h" /* low level memory routines */ +#define FSE_STATIC_LINKING_ONLY +#include "../common/fse.h" +#define HUF_STATIC_LINKING_ONLY +#include "../common/huf.h" +#include "zstd_decompress_internal.h" +#include "zstd_ddict.h" + +#if defined(ZSTD_LEGACY_SUPPORT) && (ZSTD_LEGACY_SUPPORT>=1) +# include "../legacy/zstd_legacy.h" +#endif + + + +/*-******************************************************* +* Types +*********************************************************/ +struct ZSTD_DDict_s { + void* dictBuffer; + const void* dictContent; + size_t dictSize; + ZSTD_entropyDTables_t entropy; + U32 dictID; + U32 entropyPresent; + ZSTD_customMem cMem; +}; /* typedef'd to ZSTD_DDict within "zstd.h" */ + +const void* ZSTD_DDict_dictContent(const ZSTD_DDict* ddict) +{ + assert(ddict != NULL); + return ddict->dictContent; +} + +size_t ZSTD_DDict_dictSize(const ZSTD_DDict* ddict) +{ + assert(ddict != NULL); + return ddict->dictSize; +} + +void ZSTD_copyDDictParameters(ZSTD_DCtx* dctx, const ZSTD_DDict* ddict) +{ + DEBUGLOG(4, "ZSTD_copyDDictParameters"); + assert(dctx != NULL); + assert(ddict != NULL); + dctx->dictID = ddict->dictID; + dctx->prefixStart = ddict->dictContent; + dctx->virtualStart = ddict->dictContent; + dctx->dictEnd = (const BYTE*)ddict->dictContent + ddict->dictSize; + dctx->previousDstEnd = dctx->dictEnd; +#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION + dctx->dictContentBeginForFuzzing = dctx->prefixStart; + dctx->dictContentEndForFuzzing = dctx->previousDstEnd; +#endif + if (ddict->entropyPresent) { + dctx->litEntropy = 1; + dctx->fseEntropy = 1; + dctx->LLTptr = ddict->entropy.LLTable; + dctx->MLTptr = ddict->entropy.MLTable; + dctx->OFTptr = ddict->entropy.OFTable; + dctx->HUFptr = ddict->entropy.hufTable; + dctx->entropy.rep[0] = ddict->entropy.rep[0]; + dctx->entropy.rep[1] = ddict->entropy.rep[1]; + dctx->entropy.rep[2] = ddict->entropy.rep[2]; + } else { + dctx->litEntropy = 0; + dctx->fseEntropy = 0; + } +} + + +static size_t +ZSTD_loadEntropy_intoDDict(ZSTD_DDict* ddict, + ZSTD_dictContentType_e dictContentType) +{ + ddict->dictID = 0; + ddict->entropyPresent = 0; + if (dictContentType == ZSTD_dct_rawContent) return 0; + + if (ddict->dictSize < 8) { + if (dictContentType == ZSTD_dct_fullDict) + return ERROR(dictionary_corrupted); /* only accept specified dictionaries */ + return 0; /* pure content mode */ + } + { U32 const magic = MEM_readLE32(ddict->dictContent); + if (magic != ZSTD_MAGIC_DICTIONARY) { + if (dictContentType == ZSTD_dct_fullDict) + return ERROR(dictionary_corrupted); /* only accept specified dictionaries */ + return 0; /* pure content mode */ + } + } + ddict->dictID = MEM_readLE32((const char*)ddict->dictContent + ZSTD_FRAMEIDSIZE); + + /* load entropy tables */ + RETURN_ERROR_IF(ZSTD_isError(ZSTD_loadDEntropy( + &ddict->entropy, ddict->dictContent, ddict->dictSize)), + dictionary_corrupted, ""); + ddict->entropyPresent = 1; + return 0; +} + + +static size_t ZSTD_initDDict_internal(ZSTD_DDict* ddict, + const void* dict, size_t dictSize, + ZSTD_dictLoadMethod_e dictLoadMethod, + ZSTD_dictContentType_e dictContentType) +{ + if ((dictLoadMethod == ZSTD_dlm_byRef) || (!dict) || (!dictSize)) { + ddict->dictBuffer = NULL; + ddict->dictContent = dict; + if (!dict) dictSize = 0; + } else { + void* const internalBuffer = ZSTD_customMalloc(dictSize, ddict->cMem); + ddict->dictBuffer = internalBuffer; + ddict->dictContent = internalBuffer; + if (!internalBuffer) return ERROR(memory_allocation); + ZSTD_memcpy(internalBuffer, dict, dictSize); + } + ddict->dictSize = dictSize; + ddict->entropy.hufTable[0] = (HUF_DTable)((HufLog)*0x1000001); /* cover both little and big endian */ + + /* parse dictionary content */ + FORWARD_IF_ERROR( ZSTD_loadEntropy_intoDDict(ddict, dictContentType) , ""); + + return 0; +} + +ZSTD_DDict* ZSTD_createDDict_advanced(const void* dict, size_t dictSize, + ZSTD_dictLoadMethod_e dictLoadMethod, + ZSTD_dictContentType_e dictContentType, + ZSTD_customMem customMem) +{ + if ((!customMem.customAlloc) ^ (!customMem.customFree)) return NULL; + + { ZSTD_DDict* const ddict = (ZSTD_DDict*) ZSTD_customMalloc(sizeof(ZSTD_DDict), customMem); + if (ddict == NULL) return NULL; + ddict->cMem = customMem; + { size_t const initResult = ZSTD_initDDict_internal(ddict, + dict, dictSize, + dictLoadMethod, dictContentType); + if (ZSTD_isError(initResult)) { + ZSTD_freeDDict(ddict); + return NULL; + } } + return ddict; + } +} + +/*! ZSTD_createDDict() : +* Create a digested dictionary, to start decompression without startup delay. +* `dict` content is copied inside DDict. +* Consequently, `dict` can be released after `ZSTD_DDict` creation */ +ZSTD_DDict* ZSTD_createDDict(const void* dict, size_t dictSize) +{ + ZSTD_customMem const allocator = { NULL, NULL, NULL }; + return ZSTD_createDDict_advanced(dict, dictSize, ZSTD_dlm_byCopy, ZSTD_dct_auto, allocator); +} + +/*! ZSTD_createDDict_byReference() : + * Create a digested dictionary, to start decompression without startup delay. + * Dictionary content is simply referenced, it will be accessed during decompression. + * Warning : dictBuffer must outlive DDict (DDict must be freed before dictBuffer) */ +ZSTD_DDict* ZSTD_createDDict_byReference(const void* dictBuffer, size_t dictSize) +{ + ZSTD_customMem const allocator = { NULL, NULL, NULL }; + return ZSTD_createDDict_advanced(dictBuffer, dictSize, ZSTD_dlm_byRef, ZSTD_dct_auto, allocator); +} + + +const ZSTD_DDict* ZSTD_initStaticDDict( + void* sBuffer, size_t sBufferSize, + const void* dict, size_t dictSize, + ZSTD_dictLoadMethod_e dictLoadMethod, + ZSTD_dictContentType_e dictContentType) +{ + size_t const neededSpace = sizeof(ZSTD_DDict) + + (dictLoadMethod == ZSTD_dlm_byRef ? 0 : dictSize); + ZSTD_DDict* const ddict = (ZSTD_DDict*)sBuffer; + assert(sBuffer != NULL); + assert(dict != NULL); + if ((size_t)sBuffer & 7) return NULL; /* 8-aligned */ + if (sBufferSize < neededSpace) return NULL; + if (dictLoadMethod == ZSTD_dlm_byCopy) { + ZSTD_memcpy(ddict+1, dict, dictSize); /* local copy */ + dict = ddict+1; + } + if (ZSTD_isError( ZSTD_initDDict_internal(ddict, + dict, dictSize, + ZSTD_dlm_byRef, dictContentType) )) + return NULL; + return ddict; +} + + +size_t ZSTD_freeDDict(ZSTD_DDict* ddict) +{ + if (ddict==NULL) return 0; /* support free on NULL */ + { ZSTD_customMem const cMem = ddict->cMem; + ZSTD_customFree(ddict->dictBuffer, cMem); + ZSTD_customFree(ddict, cMem); + return 0; + } +} + +/*! ZSTD_estimateDDictSize() : + * Estimate amount of memory that will be needed to create a dictionary for decompression. + * Note : dictionary created by reference using ZSTD_dlm_byRef are smaller */ +size_t ZSTD_estimateDDictSize(size_t dictSize, ZSTD_dictLoadMethod_e dictLoadMethod) +{ + return sizeof(ZSTD_DDict) + (dictLoadMethod == ZSTD_dlm_byRef ? 0 : dictSize); +} + +size_t ZSTD_sizeof_DDict(const ZSTD_DDict* ddict) +{ + if (ddict==NULL) return 0; /* support sizeof on NULL */ + return sizeof(*ddict) + (ddict->dictBuffer ? ddict->dictSize : 0) ; +} + +/*! ZSTD_getDictID_fromDDict() : + * Provides the dictID of the dictionary loaded into `ddict`. + * If @return == 0, the dictionary is not conformant to Zstandard specification, or empty. + * Non-conformant dictionaries can still be loaded, but as content-only dictionaries. */ +unsigned ZSTD_getDictID_fromDDict(const ZSTD_DDict* ddict) +{ + if (ddict==NULL) return 0; + return ZSTD_getDictID_fromDict(ddict->dictContent, ddict->dictSize); +} diff --git a/external/zstd/lib/decompress/zstd_ddict.h b/external/zstd/lib/decompress/zstd_ddict.h new file mode 100644 index 00000000..bd03268b --- /dev/null +++ b/external/zstd/lib/decompress/zstd_ddict.h @@ -0,0 +1,44 @@ +/* + * Copyright (c) Yann Collet, Facebook, Inc. + * All rights reserved. + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. + */ + + +#ifndef ZSTD_DDICT_H +#define ZSTD_DDICT_H + +/*-******************************************************* + * Dependencies + *********************************************************/ +#include "../common/zstd_deps.h" /* size_t */ +#include "../zstd.h" /* ZSTD_DDict, and several public functions */ + + +/*-******************************************************* + * Interface + *********************************************************/ + +/* note: several prototypes are already published in `zstd.h` : + * ZSTD_createDDict() + * ZSTD_createDDict_byReference() + * ZSTD_createDDict_advanced() + * ZSTD_freeDDict() + * ZSTD_initStaticDDict() + * ZSTD_sizeof_DDict() + * ZSTD_estimateDDictSize() + * ZSTD_getDictID_fromDict() + */ + +const void* ZSTD_DDict_dictContent(const ZSTD_DDict* ddict); +size_t ZSTD_DDict_dictSize(const ZSTD_DDict* ddict); + +void ZSTD_copyDDictParameters(ZSTD_DCtx* dctx, const ZSTD_DDict* ddict); + + + +#endif /* ZSTD_DDICT_H */ diff --git a/external/zstd/lib/decompress/zstd_decompress.c b/external/zstd/lib/decompress/zstd_decompress.c new file mode 100644 index 00000000..910bc034 --- /dev/null +++ b/external/zstd/lib/decompress/zstd_decompress.c @@ -0,0 +1,2167 @@ +/* + * Copyright (c) Yann Collet, Facebook, Inc. + * All rights reserved. + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. + */ + + +/* *************************************************************** +* Tuning parameters +*****************************************************************/ +/*! + * HEAPMODE : + * Select how default decompression function ZSTD_decompress() allocates its context, + * on stack (0), or into heap (1, default; requires malloc()). + * Note that functions with explicit context such as ZSTD_decompressDCtx() are unaffected. + */ +#ifndef ZSTD_HEAPMODE +# define ZSTD_HEAPMODE 1 +#endif + +/*! +* LEGACY_SUPPORT : +* if set to 1+, ZSTD_decompress() can decode older formats (v0.1+) +*/ +#ifndef ZSTD_LEGACY_SUPPORT +# define ZSTD_LEGACY_SUPPORT 0 +#endif + +/*! + * MAXWINDOWSIZE_DEFAULT : + * maximum window size accepted by DStream __by default__. + * Frames requiring more memory will be rejected. + * It's possible to set a different limit using ZSTD_DCtx_setMaxWindowSize(). + */ +#ifndef ZSTD_MAXWINDOWSIZE_DEFAULT +# define ZSTD_MAXWINDOWSIZE_DEFAULT (((U32)1 << ZSTD_WINDOWLOG_LIMIT_DEFAULT) + 1) +#endif + +/*! + * NO_FORWARD_PROGRESS_MAX : + * maximum allowed nb of calls to ZSTD_decompressStream() + * without any forward progress + * (defined as: no byte read from input, and no byte flushed to output) + * before triggering an error. + */ +#ifndef ZSTD_NO_FORWARD_PROGRESS_MAX +# define ZSTD_NO_FORWARD_PROGRESS_MAX 16 +#endif + + +/*-******************************************************* +* Dependencies +*********************************************************/ +#include "../common/zstd_deps.h" /* ZSTD_memcpy, ZSTD_memmove, ZSTD_memset */ +#include "../common/cpu.h" /* bmi2 */ +#include "../common/mem.h" /* low level memory routines */ +#define FSE_STATIC_LINKING_ONLY +#include "../common/fse.h" +#define HUF_STATIC_LINKING_ONLY +#include "../common/huf.h" +#include "../common/xxhash.h" /* XXH64_reset, XXH64_update, XXH64_digest, XXH64 */ +#include "../common/zstd_internal.h" /* blockProperties_t */ +#include "zstd_decompress_internal.h" /* ZSTD_DCtx */ +#include "zstd_ddict.h" /* ZSTD_DDictDictContent */ +#include "zstd_decompress_block.h" /* ZSTD_decompressBlock_internal */ + +#if defined(ZSTD_LEGACY_SUPPORT) && (ZSTD_LEGACY_SUPPORT>=1) +# include "../legacy/zstd_legacy.h" +#endif + + + +/************************************* + * Multiple DDicts Hashset internals * + *************************************/ + +#define DDICT_HASHSET_MAX_LOAD_FACTOR_COUNT_MULT 4 +#define DDICT_HASHSET_MAX_LOAD_FACTOR_SIZE_MULT 3 /* These two constants represent SIZE_MULT/COUNT_MULT load factor without using a float. + * Currently, that means a 0.75 load factor. + * So, if count * COUNT_MULT / size * SIZE_MULT != 0, then we've exceeded + * the load factor of the ddict hash set. + */ + +#define DDICT_HASHSET_TABLE_BASE_SIZE 64 +#define DDICT_HASHSET_RESIZE_FACTOR 2 + +/* Hash function to determine starting position of dict insertion within the table + * Returns an index between [0, hashSet->ddictPtrTableSize] + */ +static size_t ZSTD_DDictHashSet_getIndex(const ZSTD_DDictHashSet* hashSet, U32 dictID) { + const U64 hash = XXH64(&dictID, sizeof(U32), 0); + /* DDict ptr table size is a multiple of 2, use size - 1 as mask to get index within [0, hashSet->ddictPtrTableSize) */ + return hash & (hashSet->ddictPtrTableSize - 1); +} + +/* Adds DDict to a hashset without resizing it. + * If inserting a DDict with a dictID that already exists in the set, replaces the one in the set. + * Returns 0 if successful, or a zstd error code if something went wrong. + */ +static size_t ZSTD_DDictHashSet_emplaceDDict(ZSTD_DDictHashSet* hashSet, const ZSTD_DDict* ddict) { + const U32 dictID = ZSTD_getDictID_fromDDict(ddict); + size_t idx = ZSTD_DDictHashSet_getIndex(hashSet, dictID); + const size_t idxRangeMask = hashSet->ddictPtrTableSize - 1; + RETURN_ERROR_IF(hashSet->ddictPtrCount == hashSet->ddictPtrTableSize, GENERIC, "Hash set is full!"); + DEBUGLOG(4, "Hashed index: for dictID: %u is %zu", dictID, idx); + while (hashSet->ddictPtrTable[idx] != NULL) { + /* Replace existing ddict if inserting ddict with same dictID */ + if (ZSTD_getDictID_fromDDict(hashSet->ddictPtrTable[idx]) == dictID) { + DEBUGLOG(4, "DictID already exists, replacing rather than adding"); + hashSet->ddictPtrTable[idx] = ddict; + return 0; + } + idx &= idxRangeMask; + idx++; + } + DEBUGLOG(4, "Final idx after probing for dictID %u is: %zu", dictID, idx); + hashSet->ddictPtrTable[idx] = ddict; + hashSet->ddictPtrCount++; + return 0; +} + +/* Expands hash table by factor of DDICT_HASHSET_RESIZE_FACTOR and + * rehashes all values, allocates new table, frees old table. + * Returns 0 on success, otherwise a zstd error code. + */ +static size_t ZSTD_DDictHashSet_expand(ZSTD_DDictHashSet* hashSet, ZSTD_customMem customMem) { + size_t newTableSize = hashSet->ddictPtrTableSize * DDICT_HASHSET_RESIZE_FACTOR; + const ZSTD_DDict** newTable = (const ZSTD_DDict**)ZSTD_customCalloc(sizeof(ZSTD_DDict*) * newTableSize, customMem); + const ZSTD_DDict** oldTable = hashSet->ddictPtrTable; + size_t oldTableSize = hashSet->ddictPtrTableSize; + size_t i; + + DEBUGLOG(4, "Expanding DDict hash table! Old size: %zu new size: %zu", oldTableSize, newTableSize); + RETURN_ERROR_IF(!newTable, memory_allocation, "Expanded hashset allocation failed!"); + hashSet->ddictPtrTable = newTable; + hashSet->ddictPtrTableSize = newTableSize; + hashSet->ddictPtrCount = 0; + for (i = 0; i < oldTableSize; ++i) { + if (oldTable[i] != NULL) { + FORWARD_IF_ERROR(ZSTD_DDictHashSet_emplaceDDict(hashSet, oldTable[i]), ""); + } + } + ZSTD_customFree((void*)oldTable, customMem); + DEBUGLOG(4, "Finished re-hash"); + return 0; +} + +/* Fetches a DDict with the given dictID + * Returns the ZSTD_DDict* with the requested dictID. If it doesn't exist, then returns NULL. + */ +static const ZSTD_DDict* ZSTD_DDictHashSet_getDDict(ZSTD_DDictHashSet* hashSet, U32 dictID) { + size_t idx = ZSTD_DDictHashSet_getIndex(hashSet, dictID); + const size_t idxRangeMask = hashSet->ddictPtrTableSize - 1; + DEBUGLOG(4, "Hashed index: for dictID: %u is %zu", dictID, idx); + for (;;) { + size_t currDictID = ZSTD_getDictID_fromDDict(hashSet->ddictPtrTable[idx]); + if (currDictID == dictID || currDictID == 0) { + /* currDictID == 0 implies a NULL ddict entry */ + break; + } else { + idx &= idxRangeMask; /* Goes to start of table when we reach the end */ + idx++; + } + } + DEBUGLOG(4, "Final idx after probing for dictID %u is: %zu", dictID, idx); + return hashSet->ddictPtrTable[idx]; +} + +/* Allocates space for and returns a ddict hash set + * The hash set's ZSTD_DDict* table has all values automatically set to NULL to begin with. + * Returns NULL if allocation failed. + */ +static ZSTD_DDictHashSet* ZSTD_createDDictHashSet(ZSTD_customMem customMem) { + ZSTD_DDictHashSet* ret = (ZSTD_DDictHashSet*)ZSTD_customMalloc(sizeof(ZSTD_DDictHashSet), customMem); + DEBUGLOG(4, "Allocating new hash set"); + ret->ddictPtrTable = (const ZSTD_DDict**)ZSTD_customCalloc(DDICT_HASHSET_TABLE_BASE_SIZE * sizeof(ZSTD_DDict*), customMem); + ret->ddictPtrTableSize = DDICT_HASHSET_TABLE_BASE_SIZE; + ret->ddictPtrCount = 0; + if (!ret || !ret->ddictPtrTable) { + return NULL; + } + return ret; +} + +/* Frees the table of ZSTD_DDict* within a hashset, then frees the hashset itself. + * Note: The ZSTD_DDict* within the table are NOT freed. + */ +static void ZSTD_freeDDictHashSet(ZSTD_DDictHashSet* hashSet, ZSTD_customMem customMem) { + DEBUGLOG(4, "Freeing ddict hash set"); + if (hashSet && hashSet->ddictPtrTable) { + ZSTD_customFree((void*)hashSet->ddictPtrTable, customMem); + } + if (hashSet) { + ZSTD_customFree(hashSet, customMem); + } +} + +/* Public function: Adds a DDict into the ZSTD_DDictHashSet, possibly triggering a resize of the hash set. + * Returns 0 on success, or a ZSTD error. + */ +static size_t ZSTD_DDictHashSet_addDDict(ZSTD_DDictHashSet* hashSet, const ZSTD_DDict* ddict, ZSTD_customMem customMem) { + DEBUGLOG(4, "Adding dict ID: %u to hashset with - Count: %zu Tablesize: %zu", ZSTD_getDictID_fromDDict(ddict), hashSet->ddictPtrCount, hashSet->ddictPtrTableSize); + if (hashSet->ddictPtrCount * DDICT_HASHSET_MAX_LOAD_FACTOR_COUNT_MULT / hashSet->ddictPtrTableSize * DDICT_HASHSET_MAX_LOAD_FACTOR_SIZE_MULT != 0) { + FORWARD_IF_ERROR(ZSTD_DDictHashSet_expand(hashSet, customMem), ""); + } + FORWARD_IF_ERROR(ZSTD_DDictHashSet_emplaceDDict(hashSet, ddict), ""); + return 0; +} + +/*-************************************************************* +* Context management +***************************************************************/ +size_t ZSTD_sizeof_DCtx (const ZSTD_DCtx* dctx) +{ + if (dctx==NULL) return 0; /* support sizeof NULL */ + return sizeof(*dctx) + + ZSTD_sizeof_DDict(dctx->ddictLocal) + + dctx->inBuffSize + dctx->outBuffSize; +} + +size_t ZSTD_estimateDCtxSize(void) { return sizeof(ZSTD_DCtx); } + + +static size_t ZSTD_startingInputLength(ZSTD_format_e format) +{ + size_t const startingInputLength = ZSTD_FRAMEHEADERSIZE_PREFIX(format); + /* only supports formats ZSTD_f_zstd1 and ZSTD_f_zstd1_magicless */ + assert( (format == ZSTD_f_zstd1) || (format == ZSTD_f_zstd1_magicless) ); + return startingInputLength; +} + +static void ZSTD_DCtx_resetParameters(ZSTD_DCtx* dctx) +{ + assert(dctx->streamStage == zdss_init); + dctx->format = ZSTD_f_zstd1; + dctx->maxWindowSize = ZSTD_MAXWINDOWSIZE_DEFAULT; + dctx->outBufferMode = ZSTD_bm_buffered; + dctx->forceIgnoreChecksum = ZSTD_d_validateChecksum; + dctx->refMultipleDDicts = ZSTD_rmd_refSingleDDict; +} + +static void ZSTD_initDCtx_internal(ZSTD_DCtx* dctx) +{ + dctx->staticSize = 0; + dctx->ddict = NULL; + dctx->ddictLocal = NULL; + dctx->dictEnd = NULL; + dctx->ddictIsCold = 0; + dctx->dictUses = ZSTD_dont_use; + dctx->inBuff = NULL; + dctx->inBuffSize = 0; + dctx->outBuffSize = 0; + dctx->streamStage = zdss_init; + dctx->legacyContext = NULL; + dctx->previousLegacyVersion = 0; + dctx->noForwardProgress = 0; + dctx->oversizedDuration = 0; + dctx->bmi2 = ZSTD_cpuid_bmi2(ZSTD_cpuid()); + dctx->ddictSet = NULL; + ZSTD_DCtx_resetParameters(dctx); +#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION + dctx->dictContentEndForFuzzing = NULL; +#endif +} + +ZSTD_DCtx* ZSTD_initStaticDCtx(void *workspace, size_t workspaceSize) +{ + ZSTD_DCtx* const dctx = (ZSTD_DCtx*) workspace; + + if ((size_t)workspace & 7) return NULL; /* 8-aligned */ + if (workspaceSize < sizeof(ZSTD_DCtx)) return NULL; /* minimum size */ + + ZSTD_initDCtx_internal(dctx); + dctx->staticSize = workspaceSize; + dctx->inBuff = (char*)(dctx+1); + return dctx; +} + +ZSTD_DCtx* ZSTD_createDCtx_advanced(ZSTD_customMem customMem) +{ + if ((!customMem.customAlloc) ^ (!customMem.customFree)) return NULL; + + { ZSTD_DCtx* const dctx = (ZSTD_DCtx*)ZSTD_customMalloc(sizeof(*dctx), customMem); + if (!dctx) return NULL; + dctx->customMem = customMem; + ZSTD_initDCtx_internal(dctx); + return dctx; + } +} + +ZSTD_DCtx* ZSTD_createDCtx(void) +{ + DEBUGLOG(3, "ZSTD_createDCtx"); + return ZSTD_createDCtx_advanced(ZSTD_defaultCMem); +} + +static void ZSTD_clearDict(ZSTD_DCtx* dctx) +{ + ZSTD_freeDDict(dctx->ddictLocal); + dctx->ddictLocal = NULL; + dctx->ddict = NULL; + dctx->dictUses = ZSTD_dont_use; +} + +size_t ZSTD_freeDCtx(ZSTD_DCtx* dctx) +{ + if (dctx==NULL) return 0; /* support free on NULL */ + RETURN_ERROR_IF(dctx->staticSize, memory_allocation, "not compatible with static DCtx"); + { ZSTD_customMem const cMem = dctx->customMem; + ZSTD_clearDict(dctx); + ZSTD_customFree(dctx->inBuff, cMem); + dctx->inBuff = NULL; +#if defined(ZSTD_LEGACY_SUPPORT) && (ZSTD_LEGACY_SUPPORT >= 1) + if (dctx->legacyContext) + ZSTD_freeLegacyStreamContext(dctx->legacyContext, dctx->previousLegacyVersion); +#endif + if (dctx->ddictSet) { + ZSTD_freeDDictHashSet(dctx->ddictSet, cMem); + dctx->ddictSet = NULL; + } + ZSTD_customFree(dctx, cMem); + return 0; + } +} + +/* no longer useful */ +void ZSTD_copyDCtx(ZSTD_DCtx* dstDCtx, const ZSTD_DCtx* srcDCtx) +{ + size_t const toCopy = (size_t)((char*)(&dstDCtx->inBuff) - (char*)dstDCtx); + ZSTD_memcpy(dstDCtx, srcDCtx, toCopy); /* no need to copy workspace */ +} + +/* Given a dctx with a digested frame params, re-selects the correct ZSTD_DDict based on + * the requested dict ID from the frame. If there exists a reference to the correct ZSTD_DDict, then + * accordingly sets the ddict to be used to decompress the frame. + * + * If no DDict is found, then no action is taken, and the ZSTD_DCtx::ddict remains as-is. + * + * ZSTD_d_refMultipleDDicts must be enabled for this function to be called. + */ +static void ZSTD_DCtx_selectFrameDDict(ZSTD_DCtx* dctx) { + assert(dctx->refMultipleDDicts && dctx->ddictSet); + DEBUGLOG(4, "Adjusting DDict based on requested dict ID from frame"); + if (dctx->ddict) { + const ZSTD_DDict* frameDDict = ZSTD_DDictHashSet_getDDict(dctx->ddictSet, dctx->fParams.dictID); + if (frameDDict) { + DEBUGLOG(4, "DDict found!"); + ZSTD_clearDict(dctx); + dctx->dictID = dctx->fParams.dictID; + dctx->ddict = frameDDict; + dctx->dictUses = ZSTD_use_indefinitely; + } + } +} + + +/*-************************************************************* + * Frame header decoding + ***************************************************************/ + +/*! ZSTD_isFrame() : + * Tells if the content of `buffer` starts with a valid Frame Identifier. + * Note : Frame Identifier is 4 bytes. If `size < 4`, @return will always be 0. + * Note 2 : Legacy Frame Identifiers are considered valid only if Legacy Support is enabled. + * Note 3 : Skippable Frame Identifiers are considered valid. */ +unsigned ZSTD_isFrame(const void* buffer, size_t size) +{ + if (size < ZSTD_FRAMEIDSIZE) return 0; + { U32 const magic = MEM_readLE32(buffer); + if (magic == ZSTD_MAGICNUMBER) return 1; + if ((magic & ZSTD_MAGIC_SKIPPABLE_MASK) == ZSTD_MAGIC_SKIPPABLE_START) return 1; + } +#if defined(ZSTD_LEGACY_SUPPORT) && (ZSTD_LEGACY_SUPPORT >= 1) + if (ZSTD_isLegacy(buffer, size)) return 1; +#endif + return 0; +} + +/** ZSTD_frameHeaderSize_internal() : + * srcSize must be large enough to reach header size fields. + * note : only works for formats ZSTD_f_zstd1 and ZSTD_f_zstd1_magicless. + * @return : size of the Frame Header + * or an error code, which can be tested with ZSTD_isError() */ +static size_t ZSTD_frameHeaderSize_internal(const void* src, size_t srcSize, ZSTD_format_e format) +{ + size_t const minInputSize = ZSTD_startingInputLength(format); + RETURN_ERROR_IF(srcSize < minInputSize, srcSize_wrong, ""); + + { BYTE const fhd = ((const BYTE*)src)[minInputSize-1]; + U32 const dictID= fhd & 3; + U32 const singleSegment = (fhd >> 5) & 1; + U32 const fcsId = fhd >> 6; + return minInputSize + !singleSegment + + ZSTD_did_fieldSize[dictID] + ZSTD_fcs_fieldSize[fcsId] + + (singleSegment && !fcsId); + } +} + +/** ZSTD_frameHeaderSize() : + * srcSize must be >= ZSTD_frameHeaderSize_prefix. + * @return : size of the Frame Header, + * or an error code (if srcSize is too small) */ +size_t ZSTD_frameHeaderSize(const void* src, size_t srcSize) +{ + return ZSTD_frameHeaderSize_internal(src, srcSize, ZSTD_f_zstd1); +} + + +/** ZSTD_getFrameHeader_advanced() : + * decode Frame Header, or require larger `srcSize`. + * note : only works for formats ZSTD_f_zstd1 and ZSTD_f_zstd1_magicless + * @return : 0, `zfhPtr` is correctly filled, + * >0, `srcSize` is too small, value is wanted `srcSize` amount, + * or an error code, which can be tested using ZSTD_isError() */ +size_t ZSTD_getFrameHeader_advanced(ZSTD_frameHeader* zfhPtr, const void* src, size_t srcSize, ZSTD_format_e format) +{ + const BYTE* ip = (const BYTE*)src; + size_t const minInputSize = ZSTD_startingInputLength(format); + + ZSTD_memset(zfhPtr, 0, sizeof(*zfhPtr)); /* not strictly necessary, but static analyzer do not understand that zfhPtr is only going to be read only if return value is zero, since they are 2 different signals */ + if (srcSize < minInputSize) return minInputSize; + RETURN_ERROR_IF(src==NULL, GENERIC, "invalid parameter"); + + if ( (format != ZSTD_f_zstd1_magicless) + && (MEM_readLE32(src) != ZSTD_MAGICNUMBER) ) { + if ((MEM_readLE32(src) & ZSTD_MAGIC_SKIPPABLE_MASK) == ZSTD_MAGIC_SKIPPABLE_START) { + /* skippable frame */ + if (srcSize < ZSTD_SKIPPABLEHEADERSIZE) + return ZSTD_SKIPPABLEHEADERSIZE; /* magic number + frame length */ + ZSTD_memset(zfhPtr, 0, sizeof(*zfhPtr)); + zfhPtr->frameContentSize = MEM_readLE32((const char *)src + ZSTD_FRAMEIDSIZE); + zfhPtr->frameType = ZSTD_skippableFrame; + return 0; + } + RETURN_ERROR(prefix_unknown, ""); + } + + /* ensure there is enough `srcSize` to fully read/decode frame header */ + { size_t const fhsize = ZSTD_frameHeaderSize_internal(src, srcSize, format); + if (srcSize < fhsize) return fhsize; + zfhPtr->headerSize = (U32)fhsize; + } + + { BYTE const fhdByte = ip[minInputSize-1]; + size_t pos = minInputSize; + U32 const dictIDSizeCode = fhdByte&3; + U32 const checksumFlag = (fhdByte>>2)&1; + U32 const singleSegment = (fhdByte>>5)&1; + U32 const fcsID = fhdByte>>6; + U64 windowSize = 0; + U32 dictID = 0; + U64 frameContentSize = ZSTD_CONTENTSIZE_UNKNOWN; + RETURN_ERROR_IF((fhdByte & 0x08) != 0, frameParameter_unsupported, + "reserved bits, must be zero"); + + if (!singleSegment) { + BYTE const wlByte = ip[pos++]; + U32 const windowLog = (wlByte >> 3) + ZSTD_WINDOWLOG_ABSOLUTEMIN; + RETURN_ERROR_IF(windowLog > ZSTD_WINDOWLOG_MAX, frameParameter_windowTooLarge, ""); + windowSize = (1ULL << windowLog); + windowSize += (windowSize >> 3) * (wlByte&7); + } + switch(dictIDSizeCode) + { + default: assert(0); /* impossible */ + case 0 : break; + case 1 : dictID = ip[pos]; pos++; break; + case 2 : dictID = MEM_readLE16(ip+pos); pos+=2; break; + case 3 : dictID = MEM_readLE32(ip+pos); pos+=4; break; + } + switch(fcsID) + { + default: assert(0); /* impossible */ + case 0 : if (singleSegment) frameContentSize = ip[pos]; break; + case 1 : frameContentSize = MEM_readLE16(ip+pos)+256; break; + case 2 : frameContentSize = MEM_readLE32(ip+pos); break; + case 3 : frameContentSize = MEM_readLE64(ip+pos); break; + } + if (singleSegment) windowSize = frameContentSize; + + zfhPtr->frameType = ZSTD_frame; + zfhPtr->frameContentSize = frameContentSize; + zfhPtr->windowSize = windowSize; + zfhPtr->blockSizeMax = (unsigned) MIN(windowSize, ZSTD_BLOCKSIZE_MAX); + zfhPtr->dictID = dictID; + zfhPtr->checksumFlag = checksumFlag; + } + return 0; +} + +/** ZSTD_getFrameHeader() : + * decode Frame Header, or require larger `srcSize`. + * note : this function does not consume input, it only reads it. + * @return : 0, `zfhPtr` is correctly filled, + * >0, `srcSize` is too small, value is wanted `srcSize` amount, + * or an error code, which can be tested using ZSTD_isError() */ +size_t ZSTD_getFrameHeader(ZSTD_frameHeader* zfhPtr, const void* src, size_t srcSize) +{ + return ZSTD_getFrameHeader_advanced(zfhPtr, src, srcSize, ZSTD_f_zstd1); +} + + +/** ZSTD_getFrameContentSize() : + * compatible with legacy mode + * @return : decompressed size of the single frame pointed to be `src` if known, otherwise + * - ZSTD_CONTENTSIZE_UNKNOWN if the size cannot be determined + * - ZSTD_CONTENTSIZE_ERROR if an error occurred (e.g. invalid magic number, srcSize too small) */ +unsigned long long ZSTD_getFrameContentSize(const void *src, size_t srcSize) +{ +#if defined(ZSTD_LEGACY_SUPPORT) && (ZSTD_LEGACY_SUPPORT >= 1) + if (ZSTD_isLegacy(src, srcSize)) { + unsigned long long const ret = ZSTD_getDecompressedSize_legacy(src, srcSize); + return ret == 0 ? ZSTD_CONTENTSIZE_UNKNOWN : ret; + } +#endif + { ZSTD_frameHeader zfh; + if (ZSTD_getFrameHeader(&zfh, src, srcSize) != 0) + return ZSTD_CONTENTSIZE_ERROR; + if (zfh.frameType == ZSTD_skippableFrame) { + return 0; + } else { + return zfh.frameContentSize; + } } +} + +static size_t readSkippableFrameSize(void const* src, size_t srcSize) +{ + size_t const skippableHeaderSize = ZSTD_SKIPPABLEHEADERSIZE; + U32 sizeU32; + + RETURN_ERROR_IF(srcSize < ZSTD_SKIPPABLEHEADERSIZE, srcSize_wrong, ""); + + sizeU32 = MEM_readLE32((BYTE const*)src + ZSTD_FRAMEIDSIZE); + RETURN_ERROR_IF((U32)(sizeU32 + ZSTD_SKIPPABLEHEADERSIZE) < sizeU32, + frameParameter_unsupported, ""); + { + size_t const skippableSize = skippableHeaderSize + sizeU32; + RETURN_ERROR_IF(skippableSize > srcSize, srcSize_wrong, ""); + return skippableSize; + } +} + +/** ZSTD_findDecompressedSize() : + * compatible with legacy mode + * `srcSize` must be the exact length of some number of ZSTD compressed and/or + * skippable frames + * @return : decompressed size of the frames contained */ +unsigned long long ZSTD_findDecompressedSize(const void* src, size_t srcSize) +{ + unsigned long long totalDstSize = 0; + + while (srcSize >= ZSTD_startingInputLength(ZSTD_f_zstd1)) { + U32 const magicNumber = MEM_readLE32(src); + + if ((magicNumber & ZSTD_MAGIC_SKIPPABLE_MASK) == ZSTD_MAGIC_SKIPPABLE_START) { + size_t const skippableSize = readSkippableFrameSize(src, srcSize); + if (ZSTD_isError(skippableSize)) { + return ZSTD_CONTENTSIZE_ERROR; + } + assert(skippableSize <= srcSize); + + src = (const BYTE *)src + skippableSize; + srcSize -= skippableSize; + continue; + } + + { unsigned long long const ret = ZSTD_getFrameContentSize(src, srcSize); + if (ret >= ZSTD_CONTENTSIZE_ERROR) return ret; + + /* check for overflow */ + if (totalDstSize + ret < totalDstSize) return ZSTD_CONTENTSIZE_ERROR; + totalDstSize += ret; + } + { size_t const frameSrcSize = ZSTD_findFrameCompressedSize(src, srcSize); + if (ZSTD_isError(frameSrcSize)) { + return ZSTD_CONTENTSIZE_ERROR; + } + + src = (const BYTE *)src + frameSrcSize; + srcSize -= frameSrcSize; + } + } /* while (srcSize >= ZSTD_frameHeaderSize_prefix) */ + + if (srcSize) return ZSTD_CONTENTSIZE_ERROR; + + return totalDstSize; +} + +/** ZSTD_getDecompressedSize() : + * compatible with legacy mode + * @return : decompressed size if known, 0 otherwise + note : 0 can mean any of the following : + - frame content is empty + - decompressed size field is not present in frame header + - frame header unknown / not supported + - frame header not complete (`srcSize` too small) */ +unsigned long long ZSTD_getDecompressedSize(const void* src, size_t srcSize) +{ + unsigned long long const ret = ZSTD_getFrameContentSize(src, srcSize); + ZSTD_STATIC_ASSERT(ZSTD_CONTENTSIZE_ERROR < ZSTD_CONTENTSIZE_UNKNOWN); + return (ret >= ZSTD_CONTENTSIZE_ERROR) ? 0 : ret; +} + + +/** ZSTD_decodeFrameHeader() : + * `headerSize` must be the size provided by ZSTD_frameHeaderSize(). + * If multiple DDict references are enabled, also will choose the correct DDict to use. + * @return : 0 if success, or an error code, which can be tested using ZSTD_isError() */ +static size_t ZSTD_decodeFrameHeader(ZSTD_DCtx* dctx, const void* src, size_t headerSize) +{ + size_t const result = ZSTD_getFrameHeader_advanced(&(dctx->fParams), src, headerSize, dctx->format); + if (ZSTD_isError(result)) return result; /* invalid header */ + RETURN_ERROR_IF(result>0, srcSize_wrong, "headerSize too small"); + + /* Reference DDict requested by frame if dctx references multiple ddicts */ + if (dctx->refMultipleDDicts == ZSTD_rmd_refMultipleDDicts && dctx->ddictSet) { + ZSTD_DCtx_selectFrameDDict(dctx); + } + +#ifndef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION + /* Skip the dictID check in fuzzing mode, because it makes the search + * harder. + */ + RETURN_ERROR_IF(dctx->fParams.dictID && (dctx->dictID != dctx->fParams.dictID), + dictionary_wrong, ""); +#endif + dctx->validateChecksum = (dctx->fParams.checksumFlag && !dctx->forceIgnoreChecksum) ? 1 : 0; + if (dctx->validateChecksum) XXH64_reset(&dctx->xxhState, 0); + dctx->processedCSize += headerSize; + return 0; +} + +static ZSTD_frameSizeInfo ZSTD_errorFrameSizeInfo(size_t ret) +{ + ZSTD_frameSizeInfo frameSizeInfo; + frameSizeInfo.compressedSize = ret; + frameSizeInfo.decompressedBound = ZSTD_CONTENTSIZE_ERROR; + return frameSizeInfo; +} + +static ZSTD_frameSizeInfo ZSTD_findFrameSizeInfo(const void* src, size_t srcSize) +{ + ZSTD_frameSizeInfo frameSizeInfo; + ZSTD_memset(&frameSizeInfo, 0, sizeof(ZSTD_frameSizeInfo)); + +#if defined(ZSTD_LEGACY_SUPPORT) && (ZSTD_LEGACY_SUPPORT >= 1) + if (ZSTD_isLegacy(src, srcSize)) + return ZSTD_findFrameSizeInfoLegacy(src, srcSize); +#endif + + if ((srcSize >= ZSTD_SKIPPABLEHEADERSIZE) + && (MEM_readLE32(src) & ZSTD_MAGIC_SKIPPABLE_MASK) == ZSTD_MAGIC_SKIPPABLE_START) { + frameSizeInfo.compressedSize = readSkippableFrameSize(src, srcSize); + assert(ZSTD_isError(frameSizeInfo.compressedSize) || + frameSizeInfo.compressedSize <= srcSize); + return frameSizeInfo; + } else { + const BYTE* ip = (const BYTE*)src; + const BYTE* const ipstart = ip; + size_t remainingSize = srcSize; + size_t nbBlocks = 0; + ZSTD_frameHeader zfh; + + /* Extract Frame Header */ + { size_t const ret = ZSTD_getFrameHeader(&zfh, src, srcSize); + if (ZSTD_isError(ret)) + return ZSTD_errorFrameSizeInfo(ret); + if (ret > 0) + return ZSTD_errorFrameSizeInfo(ERROR(srcSize_wrong)); + } + + ip += zfh.headerSize; + remainingSize -= zfh.headerSize; + + /* Iterate over each block */ + while (1) { + blockProperties_t blockProperties; + size_t const cBlockSize = ZSTD_getcBlockSize(ip, remainingSize, &blockProperties); + if (ZSTD_isError(cBlockSize)) + return ZSTD_errorFrameSizeInfo(cBlockSize); + + if (ZSTD_blockHeaderSize + cBlockSize > remainingSize) + return ZSTD_errorFrameSizeInfo(ERROR(srcSize_wrong)); + + ip += ZSTD_blockHeaderSize + cBlockSize; + remainingSize -= ZSTD_blockHeaderSize + cBlockSize; + nbBlocks++; + + if (blockProperties.lastBlock) break; + } + + /* Final frame content checksum */ + if (zfh.checksumFlag) { + if (remainingSize < 4) + return ZSTD_errorFrameSizeInfo(ERROR(srcSize_wrong)); + ip += 4; + } + + frameSizeInfo.compressedSize = (size_t)(ip - ipstart); + frameSizeInfo.decompressedBound = (zfh.frameContentSize != ZSTD_CONTENTSIZE_UNKNOWN) + ? zfh.frameContentSize + : nbBlocks * zfh.blockSizeMax; + return frameSizeInfo; + } +} + +/** ZSTD_findFrameCompressedSize() : + * compatible with legacy mode + * `src` must point to the start of a ZSTD frame, ZSTD legacy frame, or skippable frame + * `srcSize` must be at least as large as the frame contained + * @return : the compressed size of the frame starting at `src` */ +size_t ZSTD_findFrameCompressedSize(const void *src, size_t srcSize) +{ + ZSTD_frameSizeInfo const frameSizeInfo = ZSTD_findFrameSizeInfo(src, srcSize); + return frameSizeInfo.compressedSize; +} + +/** ZSTD_decompressBound() : + * compatible with legacy mode + * `src` must point to the start of a ZSTD frame or a skippeable frame + * `srcSize` must be at least as large as the frame contained + * @return : the maximum decompressed size of the compressed source + */ +unsigned long long ZSTD_decompressBound(const void* src, size_t srcSize) +{ + unsigned long long bound = 0; + /* Iterate over each frame */ + while (srcSize > 0) { + ZSTD_frameSizeInfo const frameSizeInfo = ZSTD_findFrameSizeInfo(src, srcSize); + size_t const compressedSize = frameSizeInfo.compressedSize; + unsigned long long const decompressedBound = frameSizeInfo.decompressedBound; + if (ZSTD_isError(compressedSize) || decompressedBound == ZSTD_CONTENTSIZE_ERROR) + return ZSTD_CONTENTSIZE_ERROR; + assert(srcSize >= compressedSize); + src = (const BYTE*)src + compressedSize; + srcSize -= compressedSize; + bound += decompressedBound; + } + return bound; +} + + +/*-************************************************************* + * Frame decoding + ***************************************************************/ + +/** ZSTD_insertBlock() : + * insert `src` block into `dctx` history. Useful to track uncompressed blocks. */ +size_t ZSTD_insertBlock(ZSTD_DCtx* dctx, const void* blockStart, size_t blockSize) +{ + DEBUGLOG(5, "ZSTD_insertBlock: %u bytes", (unsigned)blockSize); + ZSTD_checkContinuity(dctx, blockStart, blockSize); + dctx->previousDstEnd = (const char*)blockStart + blockSize; + return blockSize; +} + + +static size_t ZSTD_copyRawBlock(void* dst, size_t dstCapacity, + const void* src, size_t srcSize) +{ + DEBUGLOG(5, "ZSTD_copyRawBlock"); + RETURN_ERROR_IF(srcSize > dstCapacity, dstSize_tooSmall, ""); + if (dst == NULL) { + if (srcSize == 0) return 0; + RETURN_ERROR(dstBuffer_null, ""); + } + ZSTD_memcpy(dst, src, srcSize); + return srcSize; +} + +static size_t ZSTD_setRleBlock(void* dst, size_t dstCapacity, + BYTE b, + size_t regenSize) +{ + RETURN_ERROR_IF(regenSize > dstCapacity, dstSize_tooSmall, ""); + if (dst == NULL) { + if (regenSize == 0) return 0; + RETURN_ERROR(dstBuffer_null, ""); + } + ZSTD_memset(dst, b, regenSize); + return regenSize; +} + +static void ZSTD_DCtx_trace_end(ZSTD_DCtx const* dctx, U64 uncompressedSize, U64 compressedSize, unsigned streaming) +{ +#if ZSTD_TRACE + if (dctx->traceCtx && ZSTD_trace_decompress_end != NULL) { + ZSTD_Trace trace; + ZSTD_memset(&trace, 0, sizeof(trace)); + trace.version = ZSTD_VERSION_NUMBER; + trace.streaming = streaming; + if (dctx->ddict) { + trace.dictionaryID = ZSTD_getDictID_fromDDict(dctx->ddict); + trace.dictionarySize = ZSTD_DDict_dictSize(dctx->ddict); + trace.dictionaryIsCold = dctx->ddictIsCold; + } + trace.uncompressedSize = (size_t)uncompressedSize; + trace.compressedSize = (size_t)compressedSize; + trace.dctx = dctx; + ZSTD_trace_decompress_end(dctx->traceCtx, &trace); + } +#else + (void)dctx; + (void)uncompressedSize; + (void)compressedSize; + (void)streaming; +#endif +} + + +/*! ZSTD_decompressFrame() : + * @dctx must be properly initialized + * will update *srcPtr and *srcSizePtr, + * to make *srcPtr progress by one frame. */ +static size_t ZSTD_decompressFrame(ZSTD_DCtx* dctx, + void* dst, size_t dstCapacity, + const void** srcPtr, size_t *srcSizePtr) +{ + const BYTE* const istart = (const BYTE*)(*srcPtr); + const BYTE* ip = istart; + BYTE* const ostart = (BYTE*)dst; + BYTE* const oend = dstCapacity != 0 ? ostart + dstCapacity : ostart; + BYTE* op = ostart; + size_t remainingSrcSize = *srcSizePtr; + + DEBUGLOG(4, "ZSTD_decompressFrame (srcSize:%i)", (int)*srcSizePtr); + + /* check */ + RETURN_ERROR_IF( + remainingSrcSize < ZSTD_FRAMEHEADERSIZE_MIN(dctx->format)+ZSTD_blockHeaderSize, + srcSize_wrong, ""); + + /* Frame Header */ + { size_t const frameHeaderSize = ZSTD_frameHeaderSize_internal( + ip, ZSTD_FRAMEHEADERSIZE_PREFIX(dctx->format), dctx->format); + if (ZSTD_isError(frameHeaderSize)) return frameHeaderSize; + RETURN_ERROR_IF(remainingSrcSize < frameHeaderSize+ZSTD_blockHeaderSize, + srcSize_wrong, ""); + FORWARD_IF_ERROR( ZSTD_decodeFrameHeader(dctx, ip, frameHeaderSize) , ""); + ip += frameHeaderSize; remainingSrcSize -= frameHeaderSize; + } + + /* Loop on each block */ + while (1) { + size_t decodedSize; + blockProperties_t blockProperties; + size_t const cBlockSize = ZSTD_getcBlockSize(ip, remainingSrcSize, &blockProperties); + if (ZSTD_isError(cBlockSize)) return cBlockSize; + + ip += ZSTD_blockHeaderSize; + remainingSrcSize -= ZSTD_blockHeaderSize; + RETURN_ERROR_IF(cBlockSize > remainingSrcSize, srcSize_wrong, ""); + + switch(blockProperties.blockType) + { + case bt_compressed: + decodedSize = ZSTD_decompressBlock_internal(dctx, op, (size_t)(oend-op), ip, cBlockSize, /* frame */ 1); + break; + case bt_raw : + decodedSize = ZSTD_copyRawBlock(op, (size_t)(oend-op), ip, cBlockSize); + break; + case bt_rle : + decodedSize = ZSTD_setRleBlock(op, (size_t)(oend-op), *ip, blockProperties.origSize); + break; + case bt_reserved : + default: + RETURN_ERROR(corruption_detected, "invalid block type"); + } + + if (ZSTD_isError(decodedSize)) return decodedSize; + if (dctx->validateChecksum) + XXH64_update(&dctx->xxhState, op, decodedSize); + if (decodedSize != 0) + op += decodedSize; + assert(ip != NULL); + ip += cBlockSize; + remainingSrcSize -= cBlockSize; + if (blockProperties.lastBlock) break; + } + + if (dctx->fParams.frameContentSize != ZSTD_CONTENTSIZE_UNKNOWN) { + RETURN_ERROR_IF((U64)(op-ostart) != dctx->fParams.frameContentSize, + corruption_detected, ""); + } + if (dctx->fParams.checksumFlag) { /* Frame content checksum verification */ + RETURN_ERROR_IF(remainingSrcSize<4, checksum_wrong, ""); + if (!dctx->forceIgnoreChecksum) { + U32 const checkCalc = (U32)XXH64_digest(&dctx->xxhState); + U32 checkRead; + checkRead = MEM_readLE32(ip); + RETURN_ERROR_IF(checkRead != checkCalc, checksum_wrong, ""); + } + ip += 4; + remainingSrcSize -= 4; + } + ZSTD_DCtx_trace_end(dctx, (U64)(op-ostart), (U64)(ip-istart), /* streaming */ 0); + /* Allow caller to get size read */ + *srcPtr = ip; + *srcSizePtr = remainingSrcSize; + return (size_t)(op-ostart); +} + +static size_t ZSTD_decompressMultiFrame(ZSTD_DCtx* dctx, + void* dst, size_t dstCapacity, + const void* src, size_t srcSize, + const void* dict, size_t dictSize, + const ZSTD_DDict* ddict) +{ + void* const dststart = dst; + int moreThan1Frame = 0; + + DEBUGLOG(5, "ZSTD_decompressMultiFrame"); + assert(dict==NULL || ddict==NULL); /* either dict or ddict set, not both */ + + if (ddict) { + dict = ZSTD_DDict_dictContent(ddict); + dictSize = ZSTD_DDict_dictSize(ddict); + } + + while (srcSize >= ZSTD_startingInputLength(dctx->format)) { + +#if defined(ZSTD_LEGACY_SUPPORT) && (ZSTD_LEGACY_SUPPORT >= 1) + if (ZSTD_isLegacy(src, srcSize)) { + size_t decodedSize; + size_t const frameSize = ZSTD_findFrameCompressedSizeLegacy(src, srcSize); + if (ZSTD_isError(frameSize)) return frameSize; + RETURN_ERROR_IF(dctx->staticSize, memory_allocation, + "legacy support is not compatible with static dctx"); + + decodedSize = ZSTD_decompressLegacy(dst, dstCapacity, src, frameSize, dict, dictSize); + if (ZSTD_isError(decodedSize)) return decodedSize; + + assert(decodedSize <= dstCapacity); + dst = (BYTE*)dst + decodedSize; + dstCapacity -= decodedSize; + + src = (const BYTE*)src + frameSize; + srcSize -= frameSize; + + continue; + } +#endif + + { U32 const magicNumber = MEM_readLE32(src); + DEBUGLOG(4, "reading magic number %08X (expecting %08X)", + (unsigned)magicNumber, ZSTD_MAGICNUMBER); + if ((magicNumber & ZSTD_MAGIC_SKIPPABLE_MASK) == ZSTD_MAGIC_SKIPPABLE_START) { + size_t const skippableSize = readSkippableFrameSize(src, srcSize); + FORWARD_IF_ERROR(skippableSize, "readSkippableFrameSize failed"); + assert(skippableSize <= srcSize); + + src = (const BYTE *)src + skippableSize; + srcSize -= skippableSize; + continue; + } } + + if (ddict) { + /* we were called from ZSTD_decompress_usingDDict */ + FORWARD_IF_ERROR(ZSTD_decompressBegin_usingDDict(dctx, ddict), ""); + } else { + /* this will initialize correctly with no dict if dict == NULL, so + * use this in all cases but ddict */ + FORWARD_IF_ERROR(ZSTD_decompressBegin_usingDict(dctx, dict, dictSize), ""); + } + ZSTD_checkContinuity(dctx, dst, dstCapacity); + + { const size_t res = ZSTD_decompressFrame(dctx, dst, dstCapacity, + &src, &srcSize); + RETURN_ERROR_IF( + (ZSTD_getErrorCode(res) == ZSTD_error_prefix_unknown) + && (moreThan1Frame==1), + srcSize_wrong, + "At least one frame successfully completed, " + "but following bytes are garbage: " + "it's more likely to be a srcSize error, " + "specifying more input bytes than size of frame(s). " + "Note: one could be unlucky, it might be a corruption error instead, " + "happening right at the place where we expect zstd magic bytes. " + "But this is _much_ less likely than a srcSize field error."); + if (ZSTD_isError(res)) return res; + assert(res <= dstCapacity); + if (res != 0) + dst = (BYTE*)dst + res; + dstCapacity -= res; + } + moreThan1Frame = 1; + } /* while (srcSize >= ZSTD_frameHeaderSize_prefix) */ + + RETURN_ERROR_IF(srcSize, srcSize_wrong, "input not entirely consumed"); + + return (size_t)((BYTE*)dst - (BYTE*)dststart); +} + +size_t ZSTD_decompress_usingDict(ZSTD_DCtx* dctx, + void* dst, size_t dstCapacity, + const void* src, size_t srcSize, + const void* dict, size_t dictSize) +{ + return ZSTD_decompressMultiFrame(dctx, dst, dstCapacity, src, srcSize, dict, dictSize, NULL); +} + + +static ZSTD_DDict const* ZSTD_getDDict(ZSTD_DCtx* dctx) +{ + switch (dctx->dictUses) { + default: + assert(0 /* Impossible */); + /* fall-through */ + case ZSTD_dont_use: + ZSTD_clearDict(dctx); + return NULL; + case ZSTD_use_indefinitely: + return dctx->ddict; + case ZSTD_use_once: + dctx->dictUses = ZSTD_dont_use; + return dctx->ddict; + } +} + +size_t ZSTD_decompressDCtx(ZSTD_DCtx* dctx, void* dst, size_t dstCapacity, const void* src, size_t srcSize) +{ + return ZSTD_decompress_usingDDict(dctx, dst, dstCapacity, src, srcSize, ZSTD_getDDict(dctx)); +} + + +size_t ZSTD_decompress(void* dst, size_t dstCapacity, const void* src, size_t srcSize) +{ +#if defined(ZSTD_HEAPMODE) && (ZSTD_HEAPMODE>=1) + size_t regenSize; + ZSTD_DCtx* const dctx = ZSTD_createDCtx(); + RETURN_ERROR_IF(dctx==NULL, memory_allocation, "NULL pointer!"); + regenSize = ZSTD_decompressDCtx(dctx, dst, dstCapacity, src, srcSize); + ZSTD_freeDCtx(dctx); + return regenSize; +#else /* stack mode */ + ZSTD_DCtx dctx; + ZSTD_initDCtx_internal(&dctx); + return ZSTD_decompressDCtx(&dctx, dst, dstCapacity, src, srcSize); +#endif +} + + +/*-************************************** +* Advanced Streaming Decompression API +* Bufferless and synchronous +****************************************/ +size_t ZSTD_nextSrcSizeToDecompress(ZSTD_DCtx* dctx) { return dctx->expected; } + +/** + * Similar to ZSTD_nextSrcSizeToDecompress(), but when when a block input can be streamed, + * we allow taking a partial block as the input. Currently only raw uncompressed blocks can + * be streamed. + * + * For blocks that can be streamed, this allows us to reduce the latency until we produce + * output, and avoid copying the input. + * + * @param inputSize - The total amount of input that the caller currently has. + */ +static size_t ZSTD_nextSrcSizeToDecompressWithInputSize(ZSTD_DCtx* dctx, size_t inputSize) { + if (!(dctx->stage == ZSTDds_decompressBlock || dctx->stage == ZSTDds_decompressLastBlock)) + return dctx->expected; + if (dctx->bType != bt_raw) + return dctx->expected; + return MIN(MAX(inputSize, 1), dctx->expected); +} + +ZSTD_nextInputType_e ZSTD_nextInputType(ZSTD_DCtx* dctx) { + switch(dctx->stage) + { + default: /* should not happen */ + assert(0); + case ZSTDds_getFrameHeaderSize: + case ZSTDds_decodeFrameHeader: + return ZSTDnit_frameHeader; + case ZSTDds_decodeBlockHeader: + return ZSTDnit_blockHeader; + case ZSTDds_decompressBlock: + return ZSTDnit_block; + case ZSTDds_decompressLastBlock: + return ZSTDnit_lastBlock; + case ZSTDds_checkChecksum: + return ZSTDnit_checksum; + case ZSTDds_decodeSkippableHeader: + case ZSTDds_skipFrame: + return ZSTDnit_skippableFrame; + } +} + +static int ZSTD_isSkipFrame(ZSTD_DCtx* dctx) { return dctx->stage == ZSTDds_skipFrame; } + +/** ZSTD_decompressContinue() : + * srcSize : must be the exact nb of bytes expected (see ZSTD_nextSrcSizeToDecompress()) + * @return : nb of bytes generated into `dst` (necessarily <= `dstCapacity) + * or an error code, which can be tested using ZSTD_isError() */ +size_t ZSTD_decompressContinue(ZSTD_DCtx* dctx, void* dst, size_t dstCapacity, const void* src, size_t srcSize) +{ + DEBUGLOG(5, "ZSTD_decompressContinue (srcSize:%u)", (unsigned)srcSize); + /* Sanity check */ + RETURN_ERROR_IF(srcSize != ZSTD_nextSrcSizeToDecompressWithInputSize(dctx, srcSize), srcSize_wrong, "not allowed"); + ZSTD_checkContinuity(dctx, dst, dstCapacity); + + dctx->processedCSize += srcSize; + + switch (dctx->stage) + { + case ZSTDds_getFrameHeaderSize : + assert(src != NULL); + if (dctx->format == ZSTD_f_zstd1) { /* allows header */ + assert(srcSize >= ZSTD_FRAMEIDSIZE); /* to read skippable magic number */ + if ((MEM_readLE32(src) & ZSTD_MAGIC_SKIPPABLE_MASK) == ZSTD_MAGIC_SKIPPABLE_START) { /* skippable frame */ + ZSTD_memcpy(dctx->headerBuffer, src, srcSize); + dctx->expected = ZSTD_SKIPPABLEHEADERSIZE - srcSize; /* remaining to load to get full skippable frame header */ + dctx->stage = ZSTDds_decodeSkippableHeader; + return 0; + } } + dctx->headerSize = ZSTD_frameHeaderSize_internal(src, srcSize, dctx->format); + if (ZSTD_isError(dctx->headerSize)) return dctx->headerSize; + ZSTD_memcpy(dctx->headerBuffer, src, srcSize); + dctx->expected = dctx->headerSize - srcSize; + dctx->stage = ZSTDds_decodeFrameHeader; + return 0; + + case ZSTDds_decodeFrameHeader: + assert(src != NULL); + ZSTD_memcpy(dctx->headerBuffer + (dctx->headerSize - srcSize), src, srcSize); + FORWARD_IF_ERROR(ZSTD_decodeFrameHeader(dctx, dctx->headerBuffer, dctx->headerSize), ""); + dctx->expected = ZSTD_blockHeaderSize; + dctx->stage = ZSTDds_decodeBlockHeader; + return 0; + + case ZSTDds_decodeBlockHeader: + { blockProperties_t bp; + size_t const cBlockSize = ZSTD_getcBlockSize(src, ZSTD_blockHeaderSize, &bp); + if (ZSTD_isError(cBlockSize)) return cBlockSize; + RETURN_ERROR_IF(cBlockSize > dctx->fParams.blockSizeMax, corruption_detected, "Block Size Exceeds Maximum"); + dctx->expected = cBlockSize; + dctx->bType = bp.blockType; + dctx->rleSize = bp.origSize; + if (cBlockSize) { + dctx->stage = bp.lastBlock ? ZSTDds_decompressLastBlock : ZSTDds_decompressBlock; + return 0; + } + /* empty block */ + if (bp.lastBlock) { + if (dctx->fParams.checksumFlag) { + dctx->expected = 4; + dctx->stage = ZSTDds_checkChecksum; + } else { + dctx->expected = 0; /* end of frame */ + dctx->stage = ZSTDds_getFrameHeaderSize; + } + } else { + dctx->expected = ZSTD_blockHeaderSize; /* jump to next header */ + dctx->stage = ZSTDds_decodeBlockHeader; + } + return 0; + } + + case ZSTDds_decompressLastBlock: + case ZSTDds_decompressBlock: + DEBUGLOG(5, "ZSTD_decompressContinue: case ZSTDds_decompressBlock"); + { size_t rSize; + switch(dctx->bType) + { + case bt_compressed: + DEBUGLOG(5, "ZSTD_decompressContinue: case bt_compressed"); + rSize = ZSTD_decompressBlock_internal(dctx, dst, dstCapacity, src, srcSize, /* frame */ 1); + dctx->expected = 0; /* Streaming not supported */ + break; + case bt_raw : + assert(srcSize <= dctx->expected); + rSize = ZSTD_copyRawBlock(dst, dstCapacity, src, srcSize); + FORWARD_IF_ERROR(rSize, "ZSTD_copyRawBlock failed"); + assert(rSize == srcSize); + dctx->expected -= rSize; + break; + case bt_rle : + rSize = ZSTD_setRleBlock(dst, dstCapacity, *(const BYTE*)src, dctx->rleSize); + dctx->expected = 0; /* Streaming not supported */ + break; + case bt_reserved : /* should never happen */ + default: + RETURN_ERROR(corruption_detected, "invalid block type"); + } + FORWARD_IF_ERROR(rSize, ""); + RETURN_ERROR_IF(rSize > dctx->fParams.blockSizeMax, corruption_detected, "Decompressed Block Size Exceeds Maximum"); + DEBUGLOG(5, "ZSTD_decompressContinue: decoded size from block : %u", (unsigned)rSize); + dctx->decodedSize += rSize; + if (dctx->validateChecksum) XXH64_update(&dctx->xxhState, dst, rSize); + dctx->previousDstEnd = (char*)dst + rSize; + + /* Stay on the same stage until we are finished streaming the block. */ + if (dctx->expected > 0) { + return rSize; + } + + if (dctx->stage == ZSTDds_decompressLastBlock) { /* end of frame */ + DEBUGLOG(4, "ZSTD_decompressContinue: decoded size from frame : %u", (unsigned)dctx->decodedSize); + RETURN_ERROR_IF( + dctx->fParams.frameContentSize != ZSTD_CONTENTSIZE_UNKNOWN + && dctx->decodedSize != dctx->fParams.frameContentSize, + corruption_detected, ""); + if (dctx->fParams.checksumFlag) { /* another round for frame checksum */ + dctx->expected = 4; + dctx->stage = ZSTDds_checkChecksum; + } else { + ZSTD_DCtx_trace_end(dctx, dctx->decodedSize, dctx->processedCSize, /* streaming */ 1); + dctx->expected = 0; /* ends here */ + dctx->stage = ZSTDds_getFrameHeaderSize; + } + } else { + dctx->stage = ZSTDds_decodeBlockHeader; + dctx->expected = ZSTD_blockHeaderSize; + } + return rSize; + } + + case ZSTDds_checkChecksum: + assert(srcSize == 4); /* guaranteed by dctx->expected */ + { + if (dctx->validateChecksum) { + U32 const h32 = (U32)XXH64_digest(&dctx->xxhState); + U32 const check32 = MEM_readLE32(src); + DEBUGLOG(4, "ZSTD_decompressContinue: checksum : calculated %08X :: %08X read", (unsigned)h32, (unsigned)check32); + RETURN_ERROR_IF(check32 != h32, checksum_wrong, ""); + } + ZSTD_DCtx_trace_end(dctx, dctx->decodedSize, dctx->processedCSize, /* streaming */ 1); + dctx->expected = 0; + dctx->stage = ZSTDds_getFrameHeaderSize; + return 0; + } + + case ZSTDds_decodeSkippableHeader: + assert(src != NULL); + assert(srcSize <= ZSTD_SKIPPABLEHEADERSIZE); + ZSTD_memcpy(dctx->headerBuffer + (ZSTD_SKIPPABLEHEADERSIZE - srcSize), src, srcSize); /* complete skippable header */ + dctx->expected = MEM_readLE32(dctx->headerBuffer + ZSTD_FRAMEIDSIZE); /* note : dctx->expected can grow seriously large, beyond local buffer size */ + dctx->stage = ZSTDds_skipFrame; + return 0; + + case ZSTDds_skipFrame: + dctx->expected = 0; + dctx->stage = ZSTDds_getFrameHeaderSize; + return 0; + + default: + assert(0); /* impossible */ + RETURN_ERROR(GENERIC, "impossible to reach"); /* some compiler require default to do something */ + } +} + + +static size_t ZSTD_refDictContent(ZSTD_DCtx* dctx, const void* dict, size_t dictSize) +{ + dctx->dictEnd = dctx->previousDstEnd; + dctx->virtualStart = (const char*)dict - ((const char*)(dctx->previousDstEnd) - (const char*)(dctx->prefixStart)); + dctx->prefixStart = dict; + dctx->previousDstEnd = (const char*)dict + dictSize; +#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION + dctx->dictContentBeginForFuzzing = dctx->prefixStart; + dctx->dictContentEndForFuzzing = dctx->previousDstEnd; +#endif + return 0; +} + +/*! ZSTD_loadDEntropy() : + * dict : must point at beginning of a valid zstd dictionary. + * @return : size of entropy tables read */ +size_t +ZSTD_loadDEntropy(ZSTD_entropyDTables_t* entropy, + const void* const dict, size_t const dictSize) +{ + const BYTE* dictPtr = (const BYTE*)dict; + const BYTE* const dictEnd = dictPtr + dictSize; + + RETURN_ERROR_IF(dictSize <= 8, dictionary_corrupted, "dict is too small"); + assert(MEM_readLE32(dict) == ZSTD_MAGIC_DICTIONARY); /* dict must be valid */ + dictPtr += 8; /* skip header = magic + dictID */ + + ZSTD_STATIC_ASSERT(offsetof(ZSTD_entropyDTables_t, OFTable) == offsetof(ZSTD_entropyDTables_t, LLTable) + sizeof(entropy->LLTable)); + ZSTD_STATIC_ASSERT(offsetof(ZSTD_entropyDTables_t, MLTable) == offsetof(ZSTD_entropyDTables_t, OFTable) + sizeof(entropy->OFTable)); + ZSTD_STATIC_ASSERT(sizeof(entropy->LLTable) + sizeof(entropy->OFTable) + sizeof(entropy->MLTable) >= HUF_DECOMPRESS_WORKSPACE_SIZE); + { void* const workspace = &entropy->LLTable; /* use fse tables as temporary workspace; implies fse tables are grouped together */ + size_t const workspaceSize = sizeof(entropy->LLTable) + sizeof(entropy->OFTable) + sizeof(entropy->MLTable); +#ifdef HUF_FORCE_DECOMPRESS_X1 + /* in minimal huffman, we always use X1 variants */ + size_t const hSize = HUF_readDTableX1_wksp(entropy->hufTable, + dictPtr, dictEnd - dictPtr, + workspace, workspaceSize); +#else + size_t const hSize = HUF_readDTableX2_wksp(entropy->hufTable, + dictPtr, (size_t)(dictEnd - dictPtr), + workspace, workspaceSize); +#endif + RETURN_ERROR_IF(HUF_isError(hSize), dictionary_corrupted, ""); + dictPtr += hSize; + } + + { short offcodeNCount[MaxOff+1]; + unsigned offcodeMaxValue = MaxOff, offcodeLog; + size_t const offcodeHeaderSize = FSE_readNCount(offcodeNCount, &offcodeMaxValue, &offcodeLog, dictPtr, (size_t)(dictEnd-dictPtr)); + RETURN_ERROR_IF(FSE_isError(offcodeHeaderSize), dictionary_corrupted, ""); + RETURN_ERROR_IF(offcodeMaxValue > MaxOff, dictionary_corrupted, ""); + RETURN_ERROR_IF(offcodeLog > OffFSELog, dictionary_corrupted, ""); + ZSTD_buildFSETable( entropy->OFTable, + offcodeNCount, offcodeMaxValue, + OF_base, OF_bits, + offcodeLog, + entropy->workspace, sizeof(entropy->workspace), + /* bmi2 */0); + dictPtr += offcodeHeaderSize; + } + + { short matchlengthNCount[MaxML+1]; + unsigned matchlengthMaxValue = MaxML, matchlengthLog; + size_t const matchlengthHeaderSize = FSE_readNCount(matchlengthNCount, &matchlengthMaxValue, &matchlengthLog, dictPtr, (size_t)(dictEnd-dictPtr)); + RETURN_ERROR_IF(FSE_isError(matchlengthHeaderSize), dictionary_corrupted, ""); + RETURN_ERROR_IF(matchlengthMaxValue > MaxML, dictionary_corrupted, ""); + RETURN_ERROR_IF(matchlengthLog > MLFSELog, dictionary_corrupted, ""); + ZSTD_buildFSETable( entropy->MLTable, + matchlengthNCount, matchlengthMaxValue, + ML_base, ML_bits, + matchlengthLog, + entropy->workspace, sizeof(entropy->workspace), + /* bmi2 */ 0); + dictPtr += matchlengthHeaderSize; + } + + { short litlengthNCount[MaxLL+1]; + unsigned litlengthMaxValue = MaxLL, litlengthLog; + size_t const litlengthHeaderSize = FSE_readNCount(litlengthNCount, &litlengthMaxValue, &litlengthLog, dictPtr, (size_t)(dictEnd-dictPtr)); + RETURN_ERROR_IF(FSE_isError(litlengthHeaderSize), dictionary_corrupted, ""); + RETURN_ERROR_IF(litlengthMaxValue > MaxLL, dictionary_corrupted, ""); + RETURN_ERROR_IF(litlengthLog > LLFSELog, dictionary_corrupted, ""); + ZSTD_buildFSETable( entropy->LLTable, + litlengthNCount, litlengthMaxValue, + LL_base, LL_bits, + litlengthLog, + entropy->workspace, sizeof(entropy->workspace), + /* bmi2 */ 0); + dictPtr += litlengthHeaderSize; + } + + RETURN_ERROR_IF(dictPtr+12 > dictEnd, dictionary_corrupted, ""); + { int i; + size_t const dictContentSize = (size_t)(dictEnd - (dictPtr+12)); + for (i=0; i<3; i++) { + U32 const rep = MEM_readLE32(dictPtr); dictPtr += 4; + RETURN_ERROR_IF(rep==0 || rep > dictContentSize, + dictionary_corrupted, ""); + entropy->rep[i] = rep; + } } + + return (size_t)(dictPtr - (const BYTE*)dict); +} + +static size_t ZSTD_decompress_insertDictionary(ZSTD_DCtx* dctx, const void* dict, size_t dictSize) +{ + if (dictSize < 8) return ZSTD_refDictContent(dctx, dict, dictSize); + { U32 const magic = MEM_readLE32(dict); + if (magic != ZSTD_MAGIC_DICTIONARY) { + return ZSTD_refDictContent(dctx, dict, dictSize); /* pure content mode */ + } } + dctx->dictID = MEM_readLE32((const char*)dict + ZSTD_FRAMEIDSIZE); + + /* load entropy tables */ + { size_t const eSize = ZSTD_loadDEntropy(&dctx->entropy, dict, dictSize); + RETURN_ERROR_IF(ZSTD_isError(eSize), dictionary_corrupted, ""); + dict = (const char*)dict + eSize; + dictSize -= eSize; + } + dctx->litEntropy = dctx->fseEntropy = 1; + + /* reference dictionary content */ + return ZSTD_refDictContent(dctx, dict, dictSize); +} + +size_t ZSTD_decompressBegin(ZSTD_DCtx* dctx) +{ + assert(dctx != NULL); +#if ZSTD_TRACE + dctx->traceCtx = (ZSTD_trace_decompress_begin != NULL) ? ZSTD_trace_decompress_begin(dctx) : 0; +#endif + dctx->expected = ZSTD_startingInputLength(dctx->format); /* dctx->format must be properly set */ + dctx->stage = ZSTDds_getFrameHeaderSize; + dctx->processedCSize = 0; + dctx->decodedSize = 0; + dctx->previousDstEnd = NULL; + dctx->prefixStart = NULL; + dctx->virtualStart = NULL; + dctx->dictEnd = NULL; + dctx->entropy.hufTable[0] = (HUF_DTable)((HufLog)*0x1000001); /* cover both little and big endian */ + dctx->litEntropy = dctx->fseEntropy = 0; + dctx->dictID = 0; + dctx->bType = bt_reserved; + ZSTD_STATIC_ASSERT(sizeof(dctx->entropy.rep) == sizeof(repStartValue)); + ZSTD_memcpy(dctx->entropy.rep, repStartValue, sizeof(repStartValue)); /* initial repcodes */ + dctx->LLTptr = dctx->entropy.LLTable; + dctx->MLTptr = dctx->entropy.MLTable; + dctx->OFTptr = dctx->entropy.OFTable; + dctx->HUFptr = dctx->entropy.hufTable; + return 0; +} + +size_t ZSTD_decompressBegin_usingDict(ZSTD_DCtx* dctx, const void* dict, size_t dictSize) +{ + FORWARD_IF_ERROR( ZSTD_decompressBegin(dctx) , ""); + if (dict && dictSize) + RETURN_ERROR_IF( + ZSTD_isError(ZSTD_decompress_insertDictionary(dctx, dict, dictSize)), + dictionary_corrupted, ""); + return 0; +} + + +/* ====== ZSTD_DDict ====== */ + +size_t ZSTD_decompressBegin_usingDDict(ZSTD_DCtx* dctx, const ZSTD_DDict* ddict) +{ + DEBUGLOG(4, "ZSTD_decompressBegin_usingDDict"); + assert(dctx != NULL); + if (ddict) { + const char* const dictStart = (const char*)ZSTD_DDict_dictContent(ddict); + size_t const dictSize = ZSTD_DDict_dictSize(ddict); + const void* const dictEnd = dictStart + dictSize; + dctx->ddictIsCold = (dctx->dictEnd != dictEnd); + DEBUGLOG(4, "DDict is %s", + dctx->ddictIsCold ? "~cold~" : "hot!"); + } + FORWARD_IF_ERROR( ZSTD_decompressBegin(dctx) , ""); + if (ddict) { /* NULL ddict is equivalent to no dictionary */ + ZSTD_copyDDictParameters(dctx, ddict); + } + return 0; +} + +/*! ZSTD_getDictID_fromDict() : + * Provides the dictID stored within dictionary. + * if @return == 0, the dictionary is not conformant with Zstandard specification. + * It can still be loaded, but as a content-only dictionary. */ +unsigned ZSTD_getDictID_fromDict(const void* dict, size_t dictSize) +{ + if (dictSize < 8) return 0; + if (MEM_readLE32(dict) != ZSTD_MAGIC_DICTIONARY) return 0; + return MEM_readLE32((const char*)dict + ZSTD_FRAMEIDSIZE); +} + +/*! ZSTD_getDictID_fromFrame() : + * Provides the dictID required to decompress frame stored within `src`. + * If @return == 0, the dictID could not be decoded. + * This could for one of the following reasons : + * - The frame does not require a dictionary (most common case). + * - The frame was built with dictID intentionally removed. + * Needed dictionary is a hidden information. + * Note : this use case also happens when using a non-conformant dictionary. + * - `srcSize` is too small, and as a result, frame header could not be decoded. + * Note : possible if `srcSize < ZSTD_FRAMEHEADERSIZE_MAX`. + * - This is not a Zstandard frame. + * When identifying the exact failure cause, it's possible to use + * ZSTD_getFrameHeader(), which will provide a more precise error code. */ +unsigned ZSTD_getDictID_fromFrame(const void* src, size_t srcSize) +{ + ZSTD_frameHeader zfp = { 0, 0, 0, ZSTD_frame, 0, 0, 0 }; + size_t const hError = ZSTD_getFrameHeader(&zfp, src, srcSize); + if (ZSTD_isError(hError)) return 0; + return zfp.dictID; +} + + +/*! ZSTD_decompress_usingDDict() : +* Decompression using a pre-digested Dictionary +* Use dictionary without significant overhead. */ +size_t ZSTD_decompress_usingDDict(ZSTD_DCtx* dctx, + void* dst, size_t dstCapacity, + const void* src, size_t srcSize, + const ZSTD_DDict* ddict) +{ + /* pass content and size in case legacy frames are encountered */ + return ZSTD_decompressMultiFrame(dctx, dst, dstCapacity, src, srcSize, + NULL, 0, + ddict); +} + + +/*===================================== +* Streaming decompression +*====================================*/ + +ZSTD_DStream* ZSTD_createDStream(void) +{ + DEBUGLOG(3, "ZSTD_createDStream"); + return ZSTD_createDStream_advanced(ZSTD_defaultCMem); +} + +ZSTD_DStream* ZSTD_initStaticDStream(void *workspace, size_t workspaceSize) +{ + return ZSTD_initStaticDCtx(workspace, workspaceSize); +} + +ZSTD_DStream* ZSTD_createDStream_advanced(ZSTD_customMem customMem) +{ + return ZSTD_createDCtx_advanced(customMem); +} + +size_t ZSTD_freeDStream(ZSTD_DStream* zds) +{ + return ZSTD_freeDCtx(zds); +} + + +/* *** Initialization *** */ + +size_t ZSTD_DStreamInSize(void) { return ZSTD_BLOCKSIZE_MAX + ZSTD_blockHeaderSize; } +size_t ZSTD_DStreamOutSize(void) { return ZSTD_BLOCKSIZE_MAX; } + +size_t ZSTD_DCtx_loadDictionary_advanced(ZSTD_DCtx* dctx, + const void* dict, size_t dictSize, + ZSTD_dictLoadMethod_e dictLoadMethod, + ZSTD_dictContentType_e dictContentType) +{ + RETURN_ERROR_IF(dctx->streamStage != zdss_init, stage_wrong, ""); + ZSTD_clearDict(dctx); + if (dict && dictSize != 0) { + dctx->ddictLocal = ZSTD_createDDict_advanced(dict, dictSize, dictLoadMethod, dictContentType, dctx->customMem); + RETURN_ERROR_IF(dctx->ddictLocal == NULL, memory_allocation, "NULL pointer!"); + dctx->ddict = dctx->ddictLocal; + dctx->dictUses = ZSTD_use_indefinitely; + } + return 0; +} + +size_t ZSTD_DCtx_loadDictionary_byReference(ZSTD_DCtx* dctx, const void* dict, size_t dictSize) +{ + return ZSTD_DCtx_loadDictionary_advanced(dctx, dict, dictSize, ZSTD_dlm_byRef, ZSTD_dct_auto); +} + +size_t ZSTD_DCtx_loadDictionary(ZSTD_DCtx* dctx, const void* dict, size_t dictSize) +{ + return ZSTD_DCtx_loadDictionary_advanced(dctx, dict, dictSize, ZSTD_dlm_byCopy, ZSTD_dct_auto); +} + +size_t ZSTD_DCtx_refPrefix_advanced(ZSTD_DCtx* dctx, const void* prefix, size_t prefixSize, ZSTD_dictContentType_e dictContentType) +{ + FORWARD_IF_ERROR(ZSTD_DCtx_loadDictionary_advanced(dctx, prefix, prefixSize, ZSTD_dlm_byRef, dictContentType), ""); + dctx->dictUses = ZSTD_use_once; + return 0; +} + +size_t ZSTD_DCtx_refPrefix(ZSTD_DCtx* dctx, const void* prefix, size_t prefixSize) +{ + return ZSTD_DCtx_refPrefix_advanced(dctx, prefix, prefixSize, ZSTD_dct_rawContent); +} + + +/* ZSTD_initDStream_usingDict() : + * return : expected size, aka ZSTD_startingInputLength(). + * this function cannot fail */ +size_t ZSTD_initDStream_usingDict(ZSTD_DStream* zds, const void* dict, size_t dictSize) +{ + DEBUGLOG(4, "ZSTD_initDStream_usingDict"); + FORWARD_IF_ERROR( ZSTD_DCtx_reset(zds, ZSTD_reset_session_only) , ""); + FORWARD_IF_ERROR( ZSTD_DCtx_loadDictionary(zds, dict, dictSize) , ""); + return ZSTD_startingInputLength(zds->format); +} + +/* note : this variant can't fail */ +size_t ZSTD_initDStream(ZSTD_DStream* zds) +{ + DEBUGLOG(4, "ZSTD_initDStream"); + return ZSTD_initDStream_usingDDict(zds, NULL); +} + +/* ZSTD_initDStream_usingDDict() : + * ddict will just be referenced, and must outlive decompression session + * this function cannot fail */ +size_t ZSTD_initDStream_usingDDict(ZSTD_DStream* dctx, const ZSTD_DDict* ddict) +{ + FORWARD_IF_ERROR( ZSTD_DCtx_reset(dctx, ZSTD_reset_session_only) , ""); + FORWARD_IF_ERROR( ZSTD_DCtx_refDDict(dctx, ddict) , ""); + return ZSTD_startingInputLength(dctx->format); +} + +/* ZSTD_resetDStream() : + * return : expected size, aka ZSTD_startingInputLength(). + * this function cannot fail */ +size_t ZSTD_resetDStream(ZSTD_DStream* dctx) +{ + FORWARD_IF_ERROR(ZSTD_DCtx_reset(dctx, ZSTD_reset_session_only), ""); + return ZSTD_startingInputLength(dctx->format); +} + + +size_t ZSTD_DCtx_refDDict(ZSTD_DCtx* dctx, const ZSTD_DDict* ddict) +{ + RETURN_ERROR_IF(dctx->streamStage != zdss_init, stage_wrong, ""); + ZSTD_clearDict(dctx); + if (ddict) { + dctx->ddict = ddict; + dctx->dictUses = ZSTD_use_indefinitely; + if (dctx->refMultipleDDicts == ZSTD_rmd_refMultipleDDicts) { + if (dctx->ddictSet == NULL) { + dctx->ddictSet = ZSTD_createDDictHashSet(dctx->customMem); + if (!dctx->ddictSet) { + RETURN_ERROR(memory_allocation, "Failed to allocate memory for hash set!"); + } + } + assert(!dctx->staticSize); /* Impossible: ddictSet cannot have been allocated if static dctx */ + FORWARD_IF_ERROR(ZSTD_DDictHashSet_addDDict(dctx->ddictSet, ddict, dctx->customMem), ""); + } + } + return 0; +} + +/* ZSTD_DCtx_setMaxWindowSize() : + * note : no direct equivalence in ZSTD_DCtx_setParameter, + * since this version sets windowSize, and the other sets windowLog */ +size_t ZSTD_DCtx_setMaxWindowSize(ZSTD_DCtx* dctx, size_t maxWindowSize) +{ + ZSTD_bounds const bounds = ZSTD_dParam_getBounds(ZSTD_d_windowLogMax); + size_t const min = (size_t)1 << bounds.lowerBound; + size_t const max = (size_t)1 << bounds.upperBound; + RETURN_ERROR_IF(dctx->streamStage != zdss_init, stage_wrong, ""); + RETURN_ERROR_IF(maxWindowSize < min, parameter_outOfBound, ""); + RETURN_ERROR_IF(maxWindowSize > max, parameter_outOfBound, ""); + dctx->maxWindowSize = maxWindowSize; + return 0; +} + +size_t ZSTD_DCtx_setFormat(ZSTD_DCtx* dctx, ZSTD_format_e format) +{ + return ZSTD_DCtx_setParameter(dctx, ZSTD_d_format, (int)format); +} + +ZSTD_bounds ZSTD_dParam_getBounds(ZSTD_dParameter dParam) +{ + ZSTD_bounds bounds = { 0, 0, 0 }; + switch(dParam) { + case ZSTD_d_windowLogMax: + bounds.lowerBound = ZSTD_WINDOWLOG_ABSOLUTEMIN; + bounds.upperBound = ZSTD_WINDOWLOG_MAX; + return bounds; + case ZSTD_d_format: + bounds.lowerBound = (int)ZSTD_f_zstd1; + bounds.upperBound = (int)ZSTD_f_zstd1_magicless; + ZSTD_STATIC_ASSERT(ZSTD_f_zstd1 < ZSTD_f_zstd1_magicless); + return bounds; + case ZSTD_d_stableOutBuffer: + bounds.lowerBound = (int)ZSTD_bm_buffered; + bounds.upperBound = (int)ZSTD_bm_stable; + return bounds; + case ZSTD_d_forceIgnoreChecksum: + bounds.lowerBound = (int)ZSTD_d_validateChecksum; + bounds.upperBound = (int)ZSTD_d_ignoreChecksum; + return bounds; + case ZSTD_d_refMultipleDDicts: + bounds.lowerBound = (int)ZSTD_rmd_refSingleDDict; + bounds.upperBound = (int)ZSTD_rmd_refMultipleDDicts; + return bounds; + default:; + } + bounds.error = ERROR(parameter_unsupported); + return bounds; +} + +/* ZSTD_dParam_withinBounds: + * @return 1 if value is within dParam bounds, + * 0 otherwise */ +static int ZSTD_dParam_withinBounds(ZSTD_dParameter dParam, int value) +{ + ZSTD_bounds const bounds = ZSTD_dParam_getBounds(dParam); + if (ZSTD_isError(bounds.error)) return 0; + if (value < bounds.lowerBound) return 0; + if (value > bounds.upperBound) return 0; + return 1; +} + +#define CHECK_DBOUNDS(p,v) { \ + RETURN_ERROR_IF(!ZSTD_dParam_withinBounds(p, v), parameter_outOfBound, ""); \ +} + +size_t ZSTD_DCtx_getParameter(ZSTD_DCtx* dctx, ZSTD_dParameter param, int* value) +{ + switch (param) { + case ZSTD_d_windowLogMax: + *value = (int)ZSTD_highbit32((U32)dctx->maxWindowSize); + return 0; + case ZSTD_d_format: + *value = (int)dctx->format; + return 0; + case ZSTD_d_stableOutBuffer: + *value = (int)dctx->outBufferMode; + return 0; + case ZSTD_d_forceIgnoreChecksum: + *value = (int)dctx->forceIgnoreChecksum; + return 0; + case ZSTD_d_refMultipleDDicts: + *value = (int)dctx->refMultipleDDicts; + return 0; + default:; + } + RETURN_ERROR(parameter_unsupported, ""); +} + +size_t ZSTD_DCtx_setParameter(ZSTD_DCtx* dctx, ZSTD_dParameter dParam, int value) +{ + RETURN_ERROR_IF(dctx->streamStage != zdss_init, stage_wrong, ""); + switch(dParam) { + case ZSTD_d_windowLogMax: + if (value == 0) value = ZSTD_WINDOWLOG_LIMIT_DEFAULT; + CHECK_DBOUNDS(ZSTD_d_windowLogMax, value); + dctx->maxWindowSize = ((size_t)1) << value; + return 0; + case ZSTD_d_format: + CHECK_DBOUNDS(ZSTD_d_format, value); + dctx->format = (ZSTD_format_e)value; + return 0; + case ZSTD_d_stableOutBuffer: + CHECK_DBOUNDS(ZSTD_d_stableOutBuffer, value); + dctx->outBufferMode = (ZSTD_bufferMode_e)value; + return 0; + case ZSTD_d_forceIgnoreChecksum: + CHECK_DBOUNDS(ZSTD_d_forceIgnoreChecksum, value); + dctx->forceIgnoreChecksum = (ZSTD_forceIgnoreChecksum_e)value; + return 0; + case ZSTD_d_refMultipleDDicts: + CHECK_DBOUNDS(ZSTD_d_refMultipleDDicts, value); + if (dctx->staticSize != 0) { + RETURN_ERROR(parameter_unsupported, "Static dctx does not support multiple DDicts!"); + } + dctx->refMultipleDDicts = (ZSTD_refMultipleDDicts_e)value; + return 0; + default:; + } + RETURN_ERROR(parameter_unsupported, ""); +} + +size_t ZSTD_DCtx_reset(ZSTD_DCtx* dctx, ZSTD_ResetDirective reset) +{ + if ( (reset == ZSTD_reset_session_only) + || (reset == ZSTD_reset_session_and_parameters) ) { + dctx->streamStage = zdss_init; + dctx->noForwardProgress = 0; + } + if ( (reset == ZSTD_reset_parameters) + || (reset == ZSTD_reset_session_and_parameters) ) { + RETURN_ERROR_IF(dctx->streamStage != zdss_init, stage_wrong, ""); + ZSTD_clearDict(dctx); + ZSTD_DCtx_resetParameters(dctx); + } + return 0; +} + + +size_t ZSTD_sizeof_DStream(const ZSTD_DStream* dctx) +{ + return ZSTD_sizeof_DCtx(dctx); +} + +size_t ZSTD_decodingBufferSize_min(unsigned long long windowSize, unsigned long long frameContentSize) +{ + size_t const blockSize = (size_t) MIN(windowSize, ZSTD_BLOCKSIZE_MAX); + unsigned long long const neededRBSize = windowSize + blockSize + (WILDCOPY_OVERLENGTH * 2); + unsigned long long const neededSize = MIN(frameContentSize, neededRBSize); + size_t const minRBSize = (size_t) neededSize; + RETURN_ERROR_IF((unsigned long long)minRBSize != neededSize, + frameParameter_windowTooLarge, ""); + return minRBSize; +} + +size_t ZSTD_estimateDStreamSize(size_t windowSize) +{ + size_t const blockSize = MIN(windowSize, ZSTD_BLOCKSIZE_MAX); + size_t const inBuffSize = blockSize; /* no block can be larger */ + size_t const outBuffSize = ZSTD_decodingBufferSize_min(windowSize, ZSTD_CONTENTSIZE_UNKNOWN); + return ZSTD_estimateDCtxSize() + inBuffSize + outBuffSize; +} + +size_t ZSTD_estimateDStreamSize_fromFrame(const void* src, size_t srcSize) +{ + U32 const windowSizeMax = 1U << ZSTD_WINDOWLOG_MAX; /* note : should be user-selectable, but requires an additional parameter (or a dctx) */ + ZSTD_frameHeader zfh; + size_t const err = ZSTD_getFrameHeader(&zfh, src, srcSize); + if (ZSTD_isError(err)) return err; + RETURN_ERROR_IF(err>0, srcSize_wrong, ""); + RETURN_ERROR_IF(zfh.windowSize > windowSizeMax, + frameParameter_windowTooLarge, ""); + return ZSTD_estimateDStreamSize((size_t)zfh.windowSize); +} + + +/* ***** Decompression ***** */ + +static int ZSTD_DCtx_isOverflow(ZSTD_DStream* zds, size_t const neededInBuffSize, size_t const neededOutBuffSize) +{ + return (zds->inBuffSize + zds->outBuffSize) >= (neededInBuffSize + neededOutBuffSize) * ZSTD_WORKSPACETOOLARGE_FACTOR; +} + +static void ZSTD_DCtx_updateOversizedDuration(ZSTD_DStream* zds, size_t const neededInBuffSize, size_t const neededOutBuffSize) +{ + if (ZSTD_DCtx_isOverflow(zds, neededInBuffSize, neededOutBuffSize)) + zds->oversizedDuration++; + else + zds->oversizedDuration = 0; +} + +static int ZSTD_DCtx_isOversizedTooLong(ZSTD_DStream* zds) +{ + return zds->oversizedDuration >= ZSTD_WORKSPACETOOLARGE_MAXDURATION; +} + +/* Checks that the output buffer hasn't changed if ZSTD_obm_stable is used. */ +static size_t ZSTD_checkOutBuffer(ZSTD_DStream const* zds, ZSTD_outBuffer const* output) +{ + ZSTD_outBuffer const expect = zds->expectedOutBuffer; + /* No requirement when ZSTD_obm_stable is not enabled. */ + if (zds->outBufferMode != ZSTD_bm_stable) + return 0; + /* Any buffer is allowed in zdss_init, this must be the same for every other call until + * the context is reset. + */ + if (zds->streamStage == zdss_init) + return 0; + /* The buffer must match our expectation exactly. */ + if (expect.dst == output->dst && expect.pos == output->pos && expect.size == output->size) + return 0; + RETURN_ERROR(dstBuffer_wrong, "ZSTD_d_stableOutBuffer enabled but output differs!"); +} + +/* Calls ZSTD_decompressContinue() with the right parameters for ZSTD_decompressStream() + * and updates the stage and the output buffer state. This call is extracted so it can be + * used both when reading directly from the ZSTD_inBuffer, and in buffered input mode. + * NOTE: You must break after calling this function since the streamStage is modified. + */ +static size_t ZSTD_decompressContinueStream( + ZSTD_DStream* zds, char** op, char* oend, + void const* src, size_t srcSize) { + int const isSkipFrame = ZSTD_isSkipFrame(zds); + if (zds->outBufferMode == ZSTD_bm_buffered) { + size_t const dstSize = isSkipFrame ? 0 : zds->outBuffSize - zds->outStart; + size_t const decodedSize = ZSTD_decompressContinue(zds, + zds->outBuff + zds->outStart, dstSize, src, srcSize); + FORWARD_IF_ERROR(decodedSize, ""); + if (!decodedSize && !isSkipFrame) { + zds->streamStage = zdss_read; + } else { + zds->outEnd = zds->outStart + decodedSize; + zds->streamStage = zdss_flush; + } + } else { + /* Write directly into the output buffer */ + size_t const dstSize = isSkipFrame ? 0 : (size_t)(oend - *op); + size_t const decodedSize = ZSTD_decompressContinue(zds, *op, dstSize, src, srcSize); + FORWARD_IF_ERROR(decodedSize, ""); + *op += decodedSize; + /* Flushing is not needed. */ + zds->streamStage = zdss_read; + assert(*op <= oend); + assert(zds->outBufferMode == ZSTD_bm_stable); + } + return 0; +} + +size_t ZSTD_decompressStream(ZSTD_DStream* zds, ZSTD_outBuffer* output, ZSTD_inBuffer* input) +{ + const char* const src = (const char*)input->src; + const char* const istart = input->pos != 0 ? src + input->pos : src; + const char* const iend = input->size != 0 ? src + input->size : src; + const char* ip = istart; + char* const dst = (char*)output->dst; + char* const ostart = output->pos != 0 ? dst + output->pos : dst; + char* const oend = output->size != 0 ? dst + output->size : dst; + char* op = ostart; + U32 someMoreWork = 1; + + DEBUGLOG(5, "ZSTD_decompressStream"); + RETURN_ERROR_IF( + input->pos > input->size, + srcSize_wrong, + "forbidden. in: pos: %u vs size: %u", + (U32)input->pos, (U32)input->size); + RETURN_ERROR_IF( + output->pos > output->size, + dstSize_tooSmall, + "forbidden. out: pos: %u vs size: %u", + (U32)output->pos, (U32)output->size); + DEBUGLOG(5, "input size : %u", (U32)(input->size - input->pos)); + FORWARD_IF_ERROR(ZSTD_checkOutBuffer(zds, output), ""); + + while (someMoreWork) { + switch(zds->streamStage) + { + case zdss_init : + DEBUGLOG(5, "stage zdss_init => transparent reset "); + zds->streamStage = zdss_loadHeader; + zds->lhSize = zds->inPos = zds->outStart = zds->outEnd = 0; + zds->legacyVersion = 0; + zds->hostageByte = 0; + zds->expectedOutBuffer = *output; + /* fall-through */ + + case zdss_loadHeader : + DEBUGLOG(5, "stage zdss_loadHeader (srcSize : %u)", (U32)(iend - ip)); +#if defined(ZSTD_LEGACY_SUPPORT) && (ZSTD_LEGACY_SUPPORT>=1) + if (zds->legacyVersion) { + RETURN_ERROR_IF(zds->staticSize, memory_allocation, + "legacy support is incompatible with static dctx"); + { size_t const hint = ZSTD_decompressLegacyStream(zds->legacyContext, zds->legacyVersion, output, input); + if (hint==0) zds->streamStage = zdss_init; + return hint; + } } +#endif + { size_t const hSize = ZSTD_getFrameHeader_advanced(&zds->fParams, zds->headerBuffer, zds->lhSize, zds->format); + if (zds->refMultipleDDicts && zds->ddictSet) { + ZSTD_DCtx_selectFrameDDict(zds); + } + DEBUGLOG(5, "header size : %u", (U32)hSize); + if (ZSTD_isError(hSize)) { +#if defined(ZSTD_LEGACY_SUPPORT) && (ZSTD_LEGACY_SUPPORT>=1) + U32 const legacyVersion = ZSTD_isLegacy(istart, iend-istart); + if (legacyVersion) { + ZSTD_DDict const* const ddict = ZSTD_getDDict(zds); + const void* const dict = ddict ? ZSTD_DDict_dictContent(ddict) : NULL; + size_t const dictSize = ddict ? ZSTD_DDict_dictSize(ddict) : 0; + DEBUGLOG(5, "ZSTD_decompressStream: detected legacy version v0.%u", legacyVersion); + RETURN_ERROR_IF(zds->staticSize, memory_allocation, + "legacy support is incompatible with static dctx"); + FORWARD_IF_ERROR(ZSTD_initLegacyStream(&zds->legacyContext, + zds->previousLegacyVersion, legacyVersion, + dict, dictSize), ""); + zds->legacyVersion = zds->previousLegacyVersion = legacyVersion; + { size_t const hint = ZSTD_decompressLegacyStream(zds->legacyContext, legacyVersion, output, input); + if (hint==0) zds->streamStage = zdss_init; /* or stay in stage zdss_loadHeader */ + return hint; + } } +#endif + return hSize; /* error */ + } + if (hSize != 0) { /* need more input */ + size_t const toLoad = hSize - zds->lhSize; /* if hSize!=0, hSize > zds->lhSize */ + size_t const remainingInput = (size_t)(iend-ip); + assert(iend >= ip); + if (toLoad > remainingInput) { /* not enough input to load full header */ + if (remainingInput > 0) { + ZSTD_memcpy(zds->headerBuffer + zds->lhSize, ip, remainingInput); + zds->lhSize += remainingInput; + } + input->pos = input->size; + return (MAX((size_t)ZSTD_FRAMEHEADERSIZE_MIN(zds->format), hSize) - zds->lhSize) + ZSTD_blockHeaderSize; /* remaining header bytes + next block header */ + } + assert(ip != NULL); + ZSTD_memcpy(zds->headerBuffer + zds->lhSize, ip, toLoad); zds->lhSize = hSize; ip += toLoad; + break; + } } + + /* check for single-pass mode opportunity */ + if (zds->fParams.frameContentSize != ZSTD_CONTENTSIZE_UNKNOWN + && zds->fParams.frameType != ZSTD_skippableFrame + && (U64)(size_t)(oend-op) >= zds->fParams.frameContentSize) { + size_t const cSize = ZSTD_findFrameCompressedSize(istart, (size_t)(iend-istart)); + if (cSize <= (size_t)(iend-istart)) { + /* shortcut : using single-pass mode */ + size_t const decompressedSize = ZSTD_decompress_usingDDict(zds, op, (size_t)(oend-op), istart, cSize, ZSTD_getDDict(zds)); + if (ZSTD_isError(decompressedSize)) return decompressedSize; + DEBUGLOG(4, "shortcut to single-pass ZSTD_decompress_usingDDict()") + ip = istart + cSize; + op += decompressedSize; + zds->expected = 0; + zds->streamStage = zdss_init; + someMoreWork = 0; + break; + } } + + /* Check output buffer is large enough for ZSTD_odm_stable. */ + if (zds->outBufferMode == ZSTD_bm_stable + && zds->fParams.frameType != ZSTD_skippableFrame + && zds->fParams.frameContentSize != ZSTD_CONTENTSIZE_UNKNOWN + && (U64)(size_t)(oend-op) < zds->fParams.frameContentSize) { + RETURN_ERROR(dstSize_tooSmall, "ZSTD_obm_stable passed but ZSTD_outBuffer is too small"); + } + + /* Consume header (see ZSTDds_decodeFrameHeader) */ + DEBUGLOG(4, "Consume header"); + FORWARD_IF_ERROR(ZSTD_decompressBegin_usingDDict(zds, ZSTD_getDDict(zds)), ""); + + if ((MEM_readLE32(zds->headerBuffer) & ZSTD_MAGIC_SKIPPABLE_MASK) == ZSTD_MAGIC_SKIPPABLE_START) { /* skippable frame */ + zds->expected = MEM_readLE32(zds->headerBuffer + ZSTD_FRAMEIDSIZE); + zds->stage = ZSTDds_skipFrame; + } else { + FORWARD_IF_ERROR(ZSTD_decodeFrameHeader(zds, zds->headerBuffer, zds->lhSize), ""); + zds->expected = ZSTD_blockHeaderSize; + zds->stage = ZSTDds_decodeBlockHeader; + } + + /* control buffer memory usage */ + DEBUGLOG(4, "Control max memory usage (%u KB <= max %u KB)", + (U32)(zds->fParams.windowSize >>10), + (U32)(zds->maxWindowSize >> 10) ); + zds->fParams.windowSize = MAX(zds->fParams.windowSize, 1U << ZSTD_WINDOWLOG_ABSOLUTEMIN); + RETURN_ERROR_IF(zds->fParams.windowSize > zds->maxWindowSize, + frameParameter_windowTooLarge, ""); + + /* Adapt buffer sizes to frame header instructions */ + { size_t const neededInBuffSize = MAX(zds->fParams.blockSizeMax, 4 /* frame checksum */); + size_t const neededOutBuffSize = zds->outBufferMode == ZSTD_bm_buffered + ? ZSTD_decodingBufferSize_min(zds->fParams.windowSize, zds->fParams.frameContentSize) + : 0; + + ZSTD_DCtx_updateOversizedDuration(zds, neededInBuffSize, neededOutBuffSize); + + { int const tooSmall = (zds->inBuffSize < neededInBuffSize) || (zds->outBuffSize < neededOutBuffSize); + int const tooLarge = ZSTD_DCtx_isOversizedTooLong(zds); + + if (tooSmall || tooLarge) { + size_t const bufferSize = neededInBuffSize + neededOutBuffSize; + DEBUGLOG(4, "inBuff : from %u to %u", + (U32)zds->inBuffSize, (U32)neededInBuffSize); + DEBUGLOG(4, "outBuff : from %u to %u", + (U32)zds->outBuffSize, (U32)neededOutBuffSize); + if (zds->staticSize) { /* static DCtx */ + DEBUGLOG(4, "staticSize : %u", (U32)zds->staticSize); + assert(zds->staticSize >= sizeof(ZSTD_DCtx)); /* controlled at init */ + RETURN_ERROR_IF( + bufferSize > zds->staticSize - sizeof(ZSTD_DCtx), + memory_allocation, ""); + } else { + ZSTD_customFree(zds->inBuff, zds->customMem); + zds->inBuffSize = 0; + zds->outBuffSize = 0; + zds->inBuff = (char*)ZSTD_customMalloc(bufferSize, zds->customMem); + RETURN_ERROR_IF(zds->inBuff == NULL, memory_allocation, ""); + } + zds->inBuffSize = neededInBuffSize; + zds->outBuff = zds->inBuff + zds->inBuffSize; + zds->outBuffSize = neededOutBuffSize; + } } } + zds->streamStage = zdss_read; + /* fall-through */ + + case zdss_read: + DEBUGLOG(5, "stage zdss_read"); + { size_t const neededInSize = ZSTD_nextSrcSizeToDecompressWithInputSize(zds, (size_t)(iend - ip)); + DEBUGLOG(5, "neededInSize = %u", (U32)neededInSize); + if (neededInSize==0) { /* end of frame */ + zds->streamStage = zdss_init; + someMoreWork = 0; + break; + } + if ((size_t)(iend-ip) >= neededInSize) { /* decode directly from src */ + FORWARD_IF_ERROR(ZSTD_decompressContinueStream(zds, &op, oend, ip, neededInSize), ""); + ip += neededInSize; + /* Function modifies the stage so we must break */ + break; + } } + if (ip==iend) { someMoreWork = 0; break; } /* no more input */ + zds->streamStage = zdss_load; + /* fall-through */ + + case zdss_load: + { size_t const neededInSize = ZSTD_nextSrcSizeToDecompress(zds); + size_t const toLoad = neededInSize - zds->inPos; + int const isSkipFrame = ZSTD_isSkipFrame(zds); + size_t loadedSize; + /* At this point we shouldn't be decompressing a block that we can stream. */ + assert(neededInSize == ZSTD_nextSrcSizeToDecompressWithInputSize(zds, iend - ip)); + if (isSkipFrame) { + loadedSize = MIN(toLoad, (size_t)(iend-ip)); + } else { + RETURN_ERROR_IF(toLoad > zds->inBuffSize - zds->inPos, + corruption_detected, + "should never happen"); + loadedSize = ZSTD_limitCopy(zds->inBuff + zds->inPos, toLoad, ip, (size_t)(iend-ip)); + } + ip += loadedSize; + zds->inPos += loadedSize; + if (loadedSize < toLoad) { someMoreWork = 0; break; } /* not enough input, wait for more */ + + /* decode loaded input */ + zds->inPos = 0; /* input is consumed */ + FORWARD_IF_ERROR(ZSTD_decompressContinueStream(zds, &op, oend, zds->inBuff, neededInSize), ""); + /* Function modifies the stage so we must break */ + break; + } + case zdss_flush: + { size_t const toFlushSize = zds->outEnd - zds->outStart; + size_t const flushedSize = ZSTD_limitCopy(op, (size_t)(oend-op), zds->outBuff + zds->outStart, toFlushSize); + op += flushedSize; + zds->outStart += flushedSize; + if (flushedSize == toFlushSize) { /* flush completed */ + zds->streamStage = zdss_read; + if ( (zds->outBuffSize < zds->fParams.frameContentSize) + && (zds->outStart + zds->fParams.blockSizeMax > zds->outBuffSize) ) { + DEBUGLOG(5, "restart filling outBuff from beginning (left:%i, needed:%u)", + (int)(zds->outBuffSize - zds->outStart), + (U32)zds->fParams.blockSizeMax); + zds->outStart = zds->outEnd = 0; + } + break; + } } + /* cannot complete flush */ + someMoreWork = 0; + break; + + default: + assert(0); /* impossible */ + RETURN_ERROR(GENERIC, "impossible to reach"); /* some compiler require default to do something */ + } } + + /* result */ + input->pos = (size_t)(ip - (const char*)(input->src)); + output->pos = (size_t)(op - (char*)(output->dst)); + + /* Update the expected output buffer for ZSTD_obm_stable. */ + zds->expectedOutBuffer = *output; + + if ((ip==istart) && (op==ostart)) { /* no forward progress */ + zds->noForwardProgress ++; + if (zds->noForwardProgress >= ZSTD_NO_FORWARD_PROGRESS_MAX) { + RETURN_ERROR_IF(op==oend, dstSize_tooSmall, ""); + RETURN_ERROR_IF(ip==iend, srcSize_wrong, ""); + assert(0); + } + } else { + zds->noForwardProgress = 0; + } + { size_t nextSrcSizeHint = ZSTD_nextSrcSizeToDecompress(zds); + if (!nextSrcSizeHint) { /* frame fully decoded */ + if (zds->outEnd == zds->outStart) { /* output fully flushed */ + if (zds->hostageByte) { + if (input->pos >= input->size) { + /* can't release hostage (not present) */ + zds->streamStage = zdss_read; + return 1; + } + input->pos++; /* release hostage */ + } /* zds->hostageByte */ + return 0; + } /* zds->outEnd == zds->outStart */ + if (!zds->hostageByte) { /* output not fully flushed; keep last byte as hostage; will be released when all output is flushed */ + input->pos--; /* note : pos > 0, otherwise, impossible to finish reading last block */ + zds->hostageByte=1; + } + return 1; + } /* nextSrcSizeHint==0 */ + nextSrcSizeHint += ZSTD_blockHeaderSize * (ZSTD_nextInputType(zds) == ZSTDnit_block); /* preload header of next block */ + assert(zds->inPos <= nextSrcSizeHint); + nextSrcSizeHint -= zds->inPos; /* part already loaded*/ + return nextSrcSizeHint; + } +} + +size_t ZSTD_decompressStream_simpleArgs ( + ZSTD_DCtx* dctx, + void* dst, size_t dstCapacity, size_t* dstPos, + const void* src, size_t srcSize, size_t* srcPos) +{ + ZSTD_outBuffer output = { dst, dstCapacity, *dstPos }; + ZSTD_inBuffer input = { src, srcSize, *srcPos }; + /* ZSTD_compress_generic() will check validity of dstPos and srcPos */ + size_t const cErr = ZSTD_decompressStream(dctx, &output, &input); + *dstPos = output.pos; + *srcPos = input.pos; + return cErr; +} diff --git a/external/zstd/lib/decompress/zstd_decompress_block.c b/external/zstd/lib/decompress/zstd_decompress_block.c new file mode 100644 index 00000000..349dcdc3 --- /dev/null +++ b/external/zstd/lib/decompress/zstd_decompress_block.c @@ -0,0 +1,1548 @@ +/* + * Copyright (c) Yann Collet, Facebook, Inc. + * All rights reserved. + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. + */ + +/* zstd_decompress_block : + * this module takes care of decompressing _compressed_ block */ + +/*-******************************************************* +* Dependencies +*********************************************************/ +#include "../common/zstd_deps.h" /* ZSTD_memcpy, ZSTD_memmove, ZSTD_memset */ +#include "../common/compiler.h" /* prefetch */ +#include "../common/cpu.h" /* bmi2 */ +#include "../common/mem.h" /* low level memory routines */ +#define FSE_STATIC_LINKING_ONLY +#include "../common/fse.h" +#define HUF_STATIC_LINKING_ONLY +#include "../common/huf.h" +#include "../common/zstd_internal.h" +#include "zstd_decompress_internal.h" /* ZSTD_DCtx */ +#include "zstd_ddict.h" /* ZSTD_DDictDictContent */ +#include "zstd_decompress_block.h" + +/*_******************************************************* +* Macros +**********************************************************/ + +/* These two optional macros force the use one way or another of the two + * ZSTD_decompressSequences implementations. You can't force in both directions + * at the same time. + */ +#if defined(ZSTD_FORCE_DECOMPRESS_SEQUENCES_SHORT) && \ + defined(ZSTD_FORCE_DECOMPRESS_SEQUENCES_LONG) +#error "Cannot force the use of the short and the long ZSTD_decompressSequences variants!" +#endif + + +/*_******************************************************* +* Memory operations +**********************************************************/ +static void ZSTD_copy4(void* dst, const void* src) { ZSTD_memcpy(dst, src, 4); } + + +/*-************************************************************* + * Block decoding + ***************************************************************/ + +/*! ZSTD_getcBlockSize() : + * Provides the size of compressed block from block header `src` */ +size_t ZSTD_getcBlockSize(const void* src, size_t srcSize, + blockProperties_t* bpPtr) +{ + RETURN_ERROR_IF(srcSize < ZSTD_blockHeaderSize, srcSize_wrong, ""); + + { U32 const cBlockHeader = MEM_readLE24(src); + U32 const cSize = cBlockHeader >> 3; + bpPtr->lastBlock = cBlockHeader & 1; + bpPtr->blockType = (blockType_e)((cBlockHeader >> 1) & 3); + bpPtr->origSize = cSize; /* only useful for RLE */ + if (bpPtr->blockType == bt_rle) return 1; + RETURN_ERROR_IF(bpPtr->blockType == bt_reserved, corruption_detected, ""); + return cSize; + } +} + + +/* Hidden declaration for fullbench */ +size_t ZSTD_decodeLiteralsBlock(ZSTD_DCtx* dctx, + const void* src, size_t srcSize); +/*! ZSTD_decodeLiteralsBlock() : + * @return : nb of bytes read from src (< srcSize ) + * note : symbol not declared but exposed for fullbench */ +size_t ZSTD_decodeLiteralsBlock(ZSTD_DCtx* dctx, + const void* src, size_t srcSize) /* note : srcSize < BLOCKSIZE */ +{ + DEBUGLOG(5, "ZSTD_decodeLiteralsBlock"); + RETURN_ERROR_IF(srcSize < MIN_CBLOCK_SIZE, corruption_detected, ""); + + { const BYTE* const istart = (const BYTE*) src; + symbolEncodingType_e const litEncType = (symbolEncodingType_e)(istart[0] & 3); + + switch(litEncType) + { + case set_repeat: + DEBUGLOG(5, "set_repeat flag : re-using stats from previous compressed literals block"); + RETURN_ERROR_IF(dctx->litEntropy==0, dictionary_corrupted, ""); + /* fall-through */ + + case set_compressed: + RETURN_ERROR_IF(srcSize < 5, corruption_detected, "srcSize >= MIN_CBLOCK_SIZE == 3; here we need up to 5 for case 3"); + { size_t lhSize, litSize, litCSize; + U32 singleStream=0; + U32 const lhlCode = (istart[0] >> 2) & 3; + U32 const lhc = MEM_readLE32(istart); + size_t hufSuccess; + switch(lhlCode) + { + case 0: case 1: default: /* note : default is impossible, since lhlCode into [0..3] */ + /* 2 - 2 - 10 - 10 */ + singleStream = !lhlCode; + lhSize = 3; + litSize = (lhc >> 4) & 0x3FF; + litCSize = (lhc >> 14) & 0x3FF; + break; + case 2: + /* 2 - 2 - 14 - 14 */ + lhSize = 4; + litSize = (lhc >> 4) & 0x3FFF; + litCSize = lhc >> 18; + break; + case 3: + /* 2 - 2 - 18 - 18 */ + lhSize = 5; + litSize = (lhc >> 4) & 0x3FFFF; + litCSize = (lhc >> 22) + ((size_t)istart[4] << 10); + break; + } + RETURN_ERROR_IF(litSize > ZSTD_BLOCKSIZE_MAX, corruption_detected, ""); + RETURN_ERROR_IF(litCSize + lhSize > srcSize, corruption_detected, ""); + + /* prefetch huffman table if cold */ + if (dctx->ddictIsCold && (litSize > 768 /* heuristic */)) { + PREFETCH_AREA(dctx->HUFptr, sizeof(dctx->entropy.hufTable)); + } + + if (litEncType==set_repeat) { + if (singleStream) { + hufSuccess = HUF_decompress1X_usingDTable_bmi2( + dctx->litBuffer, litSize, istart+lhSize, litCSize, + dctx->HUFptr, dctx->bmi2); + } else { + hufSuccess = HUF_decompress4X_usingDTable_bmi2( + dctx->litBuffer, litSize, istart+lhSize, litCSize, + dctx->HUFptr, dctx->bmi2); + } + } else { + if (singleStream) { +#if defined(HUF_FORCE_DECOMPRESS_X2) + hufSuccess = HUF_decompress1X_DCtx_wksp( + dctx->entropy.hufTable, dctx->litBuffer, litSize, + istart+lhSize, litCSize, dctx->workspace, + sizeof(dctx->workspace)); +#else + hufSuccess = HUF_decompress1X1_DCtx_wksp_bmi2( + dctx->entropy.hufTable, dctx->litBuffer, litSize, + istart+lhSize, litCSize, dctx->workspace, + sizeof(dctx->workspace), dctx->bmi2); +#endif + } else { + hufSuccess = HUF_decompress4X_hufOnly_wksp_bmi2( + dctx->entropy.hufTable, dctx->litBuffer, litSize, + istart+lhSize, litCSize, dctx->workspace, + sizeof(dctx->workspace), dctx->bmi2); + } + } + + RETURN_ERROR_IF(HUF_isError(hufSuccess), corruption_detected, ""); + + dctx->litPtr = dctx->litBuffer; + dctx->litSize = litSize; + dctx->litEntropy = 1; + if (litEncType==set_compressed) dctx->HUFptr = dctx->entropy.hufTable; + ZSTD_memset(dctx->litBuffer + dctx->litSize, 0, WILDCOPY_OVERLENGTH); + return litCSize + lhSize; + } + + case set_basic: + { size_t litSize, lhSize; + U32 const lhlCode = ((istart[0]) >> 2) & 3; + switch(lhlCode) + { + case 0: case 2: default: /* note : default is impossible, since lhlCode into [0..3] */ + lhSize = 1; + litSize = istart[0] >> 3; + break; + case 1: + lhSize = 2; + litSize = MEM_readLE16(istart) >> 4; + break; + case 3: + lhSize = 3; + litSize = MEM_readLE24(istart) >> 4; + break; + } + + if (lhSize+litSize+WILDCOPY_OVERLENGTH > srcSize) { /* risk reading beyond src buffer with wildcopy */ + RETURN_ERROR_IF(litSize+lhSize > srcSize, corruption_detected, ""); + ZSTD_memcpy(dctx->litBuffer, istart+lhSize, litSize); + dctx->litPtr = dctx->litBuffer; + dctx->litSize = litSize; + ZSTD_memset(dctx->litBuffer + dctx->litSize, 0, WILDCOPY_OVERLENGTH); + return lhSize+litSize; + } + /* direct reference into compressed stream */ + dctx->litPtr = istart+lhSize; + dctx->litSize = litSize; + return lhSize+litSize; + } + + case set_rle: + { U32 const lhlCode = ((istart[0]) >> 2) & 3; + size_t litSize, lhSize; + switch(lhlCode) + { + case 0: case 2: default: /* note : default is impossible, since lhlCode into [0..3] */ + lhSize = 1; + litSize = istart[0] >> 3; + break; + case 1: + lhSize = 2; + litSize = MEM_readLE16(istart) >> 4; + break; + case 3: + lhSize = 3; + litSize = MEM_readLE24(istart) >> 4; + RETURN_ERROR_IF(srcSize<4, corruption_detected, "srcSize >= MIN_CBLOCK_SIZE == 3; here we need lhSize+1 = 4"); + break; + } + RETURN_ERROR_IF(litSize > ZSTD_BLOCKSIZE_MAX, corruption_detected, ""); + ZSTD_memset(dctx->litBuffer, istart[lhSize], litSize + WILDCOPY_OVERLENGTH); + dctx->litPtr = dctx->litBuffer; + dctx->litSize = litSize; + return lhSize+1; + } + default: + RETURN_ERROR(corruption_detected, "impossible"); + } + } +} + +/* Default FSE distribution tables. + * These are pre-calculated FSE decoding tables using default distributions as defined in specification : + * https://github.com/facebook/zstd/blob/release/doc/zstd_compression_format.md#default-distributions + * They were generated programmatically with following method : + * - start from default distributions, present in /lib/common/zstd_internal.h + * - generate tables normally, using ZSTD_buildFSETable() + * - printout the content of tables + * - pretify output, report below, test with fuzzer to ensure it's correct */ + +/* Default FSE distribution table for Literal Lengths */ +static const ZSTD_seqSymbol LL_defaultDTable[(1<tableLog = 0; + DTableH->fastMode = 0; + + cell->nbBits = 0; + cell->nextState = 0; + assert(nbAddBits < 255); + cell->nbAdditionalBits = (BYTE)nbAddBits; + cell->baseValue = baseValue; +} + + +/* ZSTD_buildFSETable() : + * generate FSE decoding table for one symbol (ll, ml or off) + * cannot fail if input is valid => + * all inputs are presumed validated at this stage */ +FORCE_INLINE_TEMPLATE +void ZSTD_buildFSETable_body(ZSTD_seqSymbol* dt, + const short* normalizedCounter, unsigned maxSymbolValue, + const U32* baseValue, const U32* nbAdditionalBits, + unsigned tableLog, void* wksp, size_t wkspSize) +{ + ZSTD_seqSymbol* const tableDecode = dt+1; + U32 const maxSV1 = maxSymbolValue + 1; + U32 const tableSize = 1 << tableLog; + + U16* symbolNext = (U16*)wksp; + BYTE* spread = (BYTE*)(symbolNext + MaxSeq + 1); + U32 highThreshold = tableSize - 1; + + + /* Sanity Checks */ + assert(maxSymbolValue <= MaxSeq); + assert(tableLog <= MaxFSELog); + assert(wkspSize >= ZSTD_BUILD_FSE_TABLE_WKSP_SIZE); + (void)wkspSize; + /* Init, lay down lowprob symbols */ + { ZSTD_seqSymbol_header DTableH; + DTableH.tableLog = tableLog; + DTableH.fastMode = 1; + { S16 const largeLimit= (S16)(1 << (tableLog-1)); + U32 s; + for (s=0; s= largeLimit) DTableH.fastMode=0; + assert(normalizedCounter[s]>=0); + symbolNext[s] = (U16)normalizedCounter[s]; + } } } + ZSTD_memcpy(dt, &DTableH, sizeof(DTableH)); + } + + /* Spread symbols */ + assert(tableSize <= 512); + /* Specialized symbol spreading for the case when there are + * no low probability (-1 count) symbols. When compressing + * small blocks we avoid low probability symbols to hit this + * case, since header decoding speed matters more. + */ + if (highThreshold == tableSize - 1) { + size_t const tableMask = tableSize-1; + size_t const step = FSE_TABLESTEP(tableSize); + /* First lay down the symbols in order. + * We use a uint64_t to lay down 8 bytes at a time. This reduces branch + * misses since small blocks generally have small table logs, so nearly + * all symbols have counts <= 8. We ensure we have 8 bytes at the end of + * our buffer to handle the over-write. + */ + { + U64 const add = 0x0101010101010101ull; + size_t pos = 0; + U64 sv = 0; + U32 s; + for (s=0; s highThreshold) position = (position + step) & tableMask; /* lowprob area */ + } } + assert(position == 0); /* position must reach all cells once, otherwise normalizedCounter is incorrect */ + } + + /* Build Decoding table */ + { + U32 u; + for (u=0; u max, corruption_detected, ""); + { U32 const symbol = *(const BYTE*)src; + U32 const baseline = baseValue[symbol]; + U32 const nbBits = nbAdditionalBits[symbol]; + ZSTD_buildSeqTable_rle(DTableSpace, baseline, nbBits); + } + *DTablePtr = DTableSpace; + return 1; + case set_basic : + *DTablePtr = defaultTable; + return 0; + case set_repeat: + RETURN_ERROR_IF(!flagRepeatTable, corruption_detected, ""); + /* prefetch FSE table if used */ + if (ddictIsCold && (nbSeq > 24 /* heuristic */)) { + const void* const pStart = *DTablePtr; + size_t const pSize = sizeof(ZSTD_seqSymbol) * (SEQSYMBOL_TABLE_SIZE(maxLog)); + PREFETCH_AREA(pStart, pSize); + } + return 0; + case set_compressed : + { unsigned tableLog; + S16 norm[MaxSeq+1]; + size_t const headerSize = FSE_readNCount(norm, &max, &tableLog, src, srcSize); + RETURN_ERROR_IF(FSE_isError(headerSize), corruption_detected, ""); + RETURN_ERROR_IF(tableLog > maxLog, corruption_detected, ""); + ZSTD_buildFSETable(DTableSpace, norm, max, baseValue, nbAdditionalBits, tableLog, wksp, wkspSize, bmi2); + *DTablePtr = DTableSpace; + return headerSize; + } + default : + assert(0); + RETURN_ERROR(GENERIC, "impossible"); + } +} + +size_t ZSTD_decodeSeqHeaders(ZSTD_DCtx* dctx, int* nbSeqPtr, + const void* src, size_t srcSize) +{ + const BYTE* const istart = (const BYTE*)src; + const BYTE* const iend = istart + srcSize; + const BYTE* ip = istart; + int nbSeq; + DEBUGLOG(5, "ZSTD_decodeSeqHeaders"); + + /* check */ + RETURN_ERROR_IF(srcSize < MIN_SEQUENCES_SIZE, srcSize_wrong, ""); + + /* SeqHead */ + nbSeq = *ip++; + if (!nbSeq) { + *nbSeqPtr=0; + RETURN_ERROR_IF(srcSize != 1, srcSize_wrong, ""); + return 1; + } + if (nbSeq > 0x7F) { + if (nbSeq == 0xFF) { + RETURN_ERROR_IF(ip+2 > iend, srcSize_wrong, ""); + nbSeq = MEM_readLE16(ip) + LONGNBSEQ; + ip+=2; + } else { + RETURN_ERROR_IF(ip >= iend, srcSize_wrong, ""); + nbSeq = ((nbSeq-0x80)<<8) + *ip++; + } + } + *nbSeqPtr = nbSeq; + + /* FSE table descriptors */ + RETURN_ERROR_IF(ip+1 > iend, srcSize_wrong, ""); /* minimum possible size: 1 byte for symbol encoding types */ + { symbolEncodingType_e const LLtype = (symbolEncodingType_e)(*ip >> 6); + symbolEncodingType_e const OFtype = (symbolEncodingType_e)((*ip >> 4) & 3); + symbolEncodingType_e const MLtype = (symbolEncodingType_e)((*ip >> 2) & 3); + ip++; + + /* Build DTables */ + { size_t const llhSize = ZSTD_buildSeqTable(dctx->entropy.LLTable, &dctx->LLTptr, + LLtype, MaxLL, LLFSELog, + ip, iend-ip, + LL_base, LL_bits, + LL_defaultDTable, dctx->fseEntropy, + dctx->ddictIsCold, nbSeq, + dctx->workspace, sizeof(dctx->workspace), + dctx->bmi2); + RETURN_ERROR_IF(ZSTD_isError(llhSize), corruption_detected, "ZSTD_buildSeqTable failed"); + ip += llhSize; + } + + { size_t const ofhSize = ZSTD_buildSeqTable(dctx->entropy.OFTable, &dctx->OFTptr, + OFtype, MaxOff, OffFSELog, + ip, iend-ip, + OF_base, OF_bits, + OF_defaultDTable, dctx->fseEntropy, + dctx->ddictIsCold, nbSeq, + dctx->workspace, sizeof(dctx->workspace), + dctx->bmi2); + RETURN_ERROR_IF(ZSTD_isError(ofhSize), corruption_detected, "ZSTD_buildSeqTable failed"); + ip += ofhSize; + } + + { size_t const mlhSize = ZSTD_buildSeqTable(dctx->entropy.MLTable, &dctx->MLTptr, + MLtype, MaxML, MLFSELog, + ip, iend-ip, + ML_base, ML_bits, + ML_defaultDTable, dctx->fseEntropy, + dctx->ddictIsCold, nbSeq, + dctx->workspace, sizeof(dctx->workspace), + dctx->bmi2); + RETURN_ERROR_IF(ZSTD_isError(mlhSize), corruption_detected, "ZSTD_buildSeqTable failed"); + ip += mlhSize; + } + } + + return ip-istart; +} + + +typedef struct { + size_t litLength; + size_t matchLength; + size_t offset; +} seq_t; + +typedef struct { + size_t state; + const ZSTD_seqSymbol* table; +} ZSTD_fseState; + +typedef struct { + BIT_DStream_t DStream; + ZSTD_fseState stateLL; + ZSTD_fseState stateOffb; + ZSTD_fseState stateML; + size_t prevOffset[ZSTD_REP_NUM]; +} seqState_t; + +/*! ZSTD_overlapCopy8() : + * Copies 8 bytes from ip to op and updates op and ip where ip <= op. + * If the offset is < 8 then the offset is spread to at least 8 bytes. + * + * Precondition: *ip <= *op + * Postcondition: *op - *op >= 8 + */ +HINT_INLINE void ZSTD_overlapCopy8(BYTE** op, BYTE const** ip, size_t offset) { + assert(*ip <= *op); + if (offset < 8) { + /* close range match, overlap */ + static const U32 dec32table[] = { 0, 1, 2, 1, 4, 4, 4, 4 }; /* added */ + static const int dec64table[] = { 8, 8, 8, 7, 8, 9,10,11 }; /* subtracted */ + int const sub2 = dec64table[offset]; + (*op)[0] = (*ip)[0]; + (*op)[1] = (*ip)[1]; + (*op)[2] = (*ip)[2]; + (*op)[3] = (*ip)[3]; + *ip += dec32table[offset]; + ZSTD_copy4(*op+4, *ip); + *ip -= sub2; + } else { + ZSTD_copy8(*op, *ip); + } + *ip += 8; + *op += 8; + assert(*op - *ip >= 8); +} + +/*! ZSTD_safecopy() : + * Specialized version of memcpy() that is allowed to READ up to WILDCOPY_OVERLENGTH past the input buffer + * and write up to 16 bytes past oend_w (op >= oend_w is allowed). + * This function is only called in the uncommon case where the sequence is near the end of the block. It + * should be fast for a single long sequence, but can be slow for several short sequences. + * + * @param ovtype controls the overlap detection + * - ZSTD_no_overlap: The source and destination are guaranteed to be at least WILDCOPY_VECLEN bytes apart. + * - ZSTD_overlap_src_before_dst: The src and dst may overlap and may be any distance apart. + * The src buffer must be before the dst buffer. + */ +static void ZSTD_safecopy(BYTE* op, BYTE* const oend_w, BYTE const* ip, ptrdiff_t length, ZSTD_overlap_e ovtype) { + ptrdiff_t const diff = op - ip; + BYTE* const oend = op + length; + + assert((ovtype == ZSTD_no_overlap && (diff <= -8 || diff >= 8 || op >= oend_w)) || + (ovtype == ZSTD_overlap_src_before_dst && diff >= 0)); + + if (length < 8) { + /* Handle short lengths. */ + while (op < oend) *op++ = *ip++; + return; + } + if (ovtype == ZSTD_overlap_src_before_dst) { + /* Copy 8 bytes and ensure the offset >= 8 when there can be overlap. */ + assert(length >= 8); + ZSTD_overlapCopy8(&op, &ip, diff); + assert(op - ip >= 8); + assert(op <= oend); + } + + if (oend <= oend_w) { + /* No risk of overwrite. */ + ZSTD_wildcopy(op, ip, length, ovtype); + return; + } + if (op <= oend_w) { + /* Wildcopy until we get close to the end. */ + assert(oend > oend_w); + ZSTD_wildcopy(op, ip, oend_w - op, ovtype); + ip += oend_w - op; + op = oend_w; + } + /* Handle the leftovers. */ + while (op < oend) *op++ = *ip++; +} + +/* ZSTD_execSequenceEnd(): + * This version handles cases that are near the end of the output buffer. It requires + * more careful checks to make sure there is no overflow. By separating out these hard + * and unlikely cases, we can speed up the common cases. + * + * NOTE: This function needs to be fast for a single long sequence, but doesn't need + * to be optimized for many small sequences, since those fall into ZSTD_execSequence(). + */ +FORCE_NOINLINE +size_t ZSTD_execSequenceEnd(BYTE* op, + BYTE* const oend, seq_t sequence, + const BYTE** litPtr, const BYTE* const litLimit, + const BYTE* const prefixStart, const BYTE* const virtualStart, const BYTE* const dictEnd) +{ + BYTE* const oLitEnd = op + sequence.litLength; + size_t const sequenceLength = sequence.litLength + sequence.matchLength; + const BYTE* const iLitEnd = *litPtr + sequence.litLength; + const BYTE* match = oLitEnd - sequence.offset; + BYTE* const oend_w = oend - WILDCOPY_OVERLENGTH; + + /* bounds checks : careful of address space overflow in 32-bit mode */ + RETURN_ERROR_IF(sequenceLength > (size_t)(oend - op), dstSize_tooSmall, "last match must fit within dstBuffer"); + RETURN_ERROR_IF(sequence.litLength > (size_t)(litLimit - *litPtr), corruption_detected, "try to read beyond literal buffer"); + assert(op < op + sequenceLength); + assert(oLitEnd < op + sequenceLength); + + /* copy literals */ + ZSTD_safecopy(op, oend_w, *litPtr, sequence.litLength, ZSTD_no_overlap); + op = oLitEnd; + *litPtr = iLitEnd; + + /* copy Match */ + if (sequence.offset > (size_t)(oLitEnd - prefixStart)) { + /* offset beyond prefix */ + RETURN_ERROR_IF(sequence.offset > (size_t)(oLitEnd - virtualStart), corruption_detected, ""); + match = dictEnd - (prefixStart-match); + if (match + sequence.matchLength <= dictEnd) { + ZSTD_memmove(oLitEnd, match, sequence.matchLength); + return sequenceLength; + } + /* span extDict & currentPrefixSegment */ + { size_t const length1 = dictEnd - match; + ZSTD_memmove(oLitEnd, match, length1); + op = oLitEnd + length1; + sequence.matchLength -= length1; + match = prefixStart; + } } + ZSTD_safecopy(op, oend_w, match, sequence.matchLength, ZSTD_overlap_src_before_dst); + return sequenceLength; +} + +HINT_INLINE +size_t ZSTD_execSequence(BYTE* op, + BYTE* const oend, seq_t sequence, + const BYTE** litPtr, const BYTE* const litLimit, + const BYTE* const prefixStart, const BYTE* const virtualStart, const BYTE* const dictEnd) +{ + BYTE* const oLitEnd = op + sequence.litLength; + size_t const sequenceLength = sequence.litLength + sequence.matchLength; + BYTE* const oMatchEnd = op + sequenceLength; /* risk : address space overflow (32-bits) */ + BYTE* const oend_w = oend - WILDCOPY_OVERLENGTH; /* risk : address space underflow on oend=NULL */ + const BYTE* const iLitEnd = *litPtr + sequence.litLength; + const BYTE* match = oLitEnd - sequence.offset; + + assert(op != NULL /* Precondition */); + assert(oend_w < oend /* No underflow */); + /* Handle edge cases in a slow path: + * - Read beyond end of literals + * - Match end is within WILDCOPY_OVERLIMIT of oend + * - 32-bit mode and the match length overflows + */ + if (UNLIKELY( + iLitEnd > litLimit || + oMatchEnd > oend_w || + (MEM_32bits() && (size_t)(oend - op) < sequenceLength + WILDCOPY_OVERLENGTH))) + return ZSTD_execSequenceEnd(op, oend, sequence, litPtr, litLimit, prefixStart, virtualStart, dictEnd); + + /* Assumptions (everything else goes into ZSTD_execSequenceEnd()) */ + assert(op <= oLitEnd /* No overflow */); + assert(oLitEnd < oMatchEnd /* Non-zero match & no overflow */); + assert(oMatchEnd <= oend /* No underflow */); + assert(iLitEnd <= litLimit /* Literal length is in bounds */); + assert(oLitEnd <= oend_w /* Can wildcopy literals */); + assert(oMatchEnd <= oend_w /* Can wildcopy matches */); + + /* Copy Literals: + * Split out litLength <= 16 since it is nearly always true. +1.6% on gcc-9. + * We likely don't need the full 32-byte wildcopy. + */ + assert(WILDCOPY_OVERLENGTH >= 16); + ZSTD_copy16(op, (*litPtr)); + if (UNLIKELY(sequence.litLength > 16)) { + ZSTD_wildcopy(op+16, (*litPtr)+16, sequence.litLength-16, ZSTD_no_overlap); + } + op = oLitEnd; + *litPtr = iLitEnd; /* update for next sequence */ + + /* Copy Match */ + if (sequence.offset > (size_t)(oLitEnd - prefixStart)) { + /* offset beyond prefix -> go into extDict */ + RETURN_ERROR_IF(UNLIKELY(sequence.offset > (size_t)(oLitEnd - virtualStart)), corruption_detected, ""); + match = dictEnd + (match - prefixStart); + if (match + sequence.matchLength <= dictEnd) { + ZSTD_memmove(oLitEnd, match, sequence.matchLength); + return sequenceLength; + } + /* span extDict & currentPrefixSegment */ + { size_t const length1 = dictEnd - match; + ZSTD_memmove(oLitEnd, match, length1); + op = oLitEnd + length1; + sequence.matchLength -= length1; + match = prefixStart; + } } + /* Match within prefix of 1 or more bytes */ + assert(op <= oMatchEnd); + assert(oMatchEnd <= oend_w); + assert(match >= prefixStart); + assert(sequence.matchLength >= 1); + + /* Nearly all offsets are >= WILDCOPY_VECLEN bytes, which means we can use wildcopy + * without overlap checking. + */ + if (LIKELY(sequence.offset >= WILDCOPY_VECLEN)) { + /* We bet on a full wildcopy for matches, since we expect matches to be + * longer than literals (in general). In silesia, ~10% of matches are longer + * than 16 bytes. + */ + ZSTD_wildcopy(op, match, (ptrdiff_t)sequence.matchLength, ZSTD_no_overlap); + return sequenceLength; + } + assert(sequence.offset < WILDCOPY_VECLEN); + + /* Copy 8 bytes and spread the offset to be >= 8. */ + ZSTD_overlapCopy8(&op, &match, sequence.offset); + + /* If the match length is > 8 bytes, then continue with the wildcopy. */ + if (sequence.matchLength > 8) { + assert(op < oMatchEnd); + ZSTD_wildcopy(op, match, (ptrdiff_t)sequence.matchLength-8, ZSTD_overlap_src_before_dst); + } + return sequenceLength; +} + +static void +ZSTD_initFseState(ZSTD_fseState* DStatePtr, BIT_DStream_t* bitD, const ZSTD_seqSymbol* dt) +{ + const void* ptr = dt; + const ZSTD_seqSymbol_header* const DTableH = (const ZSTD_seqSymbol_header*)ptr; + DStatePtr->state = BIT_readBits(bitD, DTableH->tableLog); + DEBUGLOG(6, "ZSTD_initFseState : val=%u using %u bits", + (U32)DStatePtr->state, DTableH->tableLog); + BIT_reloadDStream(bitD); + DStatePtr->table = dt + 1; +} + +FORCE_INLINE_TEMPLATE void +ZSTD_updateFseState(ZSTD_fseState* DStatePtr, BIT_DStream_t* bitD) +{ + ZSTD_seqSymbol const DInfo = DStatePtr->table[DStatePtr->state]; + U32 const nbBits = DInfo.nbBits; + size_t const lowBits = BIT_readBits(bitD, nbBits); + DStatePtr->state = DInfo.nextState + lowBits; +} + +FORCE_INLINE_TEMPLATE void +ZSTD_updateFseStateWithDInfo(ZSTD_fseState* DStatePtr, BIT_DStream_t* bitD, ZSTD_seqSymbol const DInfo) +{ + U32 const nbBits = DInfo.nbBits; + size_t const lowBits = BIT_readBits(bitD, nbBits); + DStatePtr->state = DInfo.nextState + lowBits; +} + +/* We need to add at most (ZSTD_WINDOWLOG_MAX_32 - 1) bits to read the maximum + * offset bits. But we can only read at most (STREAM_ACCUMULATOR_MIN_32 - 1) + * bits before reloading. This value is the maximum number of bytes we read + * after reloading when we are decoding long offsets. + */ +#define LONG_OFFSETS_MAX_EXTRA_BITS_32 \ + (ZSTD_WINDOWLOG_MAX_32 > STREAM_ACCUMULATOR_MIN_32 \ + ? ZSTD_WINDOWLOG_MAX_32 - STREAM_ACCUMULATOR_MIN_32 \ + : 0) + +typedef enum { ZSTD_lo_isRegularOffset, ZSTD_lo_isLongOffset=1 } ZSTD_longOffset_e; + +FORCE_INLINE_TEMPLATE seq_t +ZSTD_decodeSequence(seqState_t* seqState, const ZSTD_longOffset_e longOffsets) +{ + seq_t seq; + ZSTD_seqSymbol const llDInfo = seqState->stateLL.table[seqState->stateLL.state]; + ZSTD_seqSymbol const mlDInfo = seqState->stateML.table[seqState->stateML.state]; + ZSTD_seqSymbol const ofDInfo = seqState->stateOffb.table[seqState->stateOffb.state]; + U32 const llBase = llDInfo.baseValue; + U32 const mlBase = mlDInfo.baseValue; + U32 const ofBase = ofDInfo.baseValue; + BYTE const llBits = llDInfo.nbAdditionalBits; + BYTE const mlBits = mlDInfo.nbAdditionalBits; + BYTE const ofBits = ofDInfo.nbAdditionalBits; + BYTE const totalBits = llBits+mlBits+ofBits; + + /* sequence */ + { size_t offset; + if (ofBits > 1) { + ZSTD_STATIC_ASSERT(ZSTD_lo_isLongOffset == 1); + ZSTD_STATIC_ASSERT(LONG_OFFSETS_MAX_EXTRA_BITS_32 == 5); + assert(ofBits <= MaxOff); + if (MEM_32bits() && longOffsets && (ofBits >= STREAM_ACCUMULATOR_MIN_32)) { + U32 const extraBits = ofBits - MIN(ofBits, 32 - seqState->DStream.bitsConsumed); + offset = ofBase + (BIT_readBitsFast(&seqState->DStream, ofBits - extraBits) << extraBits); + BIT_reloadDStream(&seqState->DStream); + if (extraBits) offset += BIT_readBitsFast(&seqState->DStream, extraBits); + assert(extraBits <= LONG_OFFSETS_MAX_EXTRA_BITS_32); /* to avoid another reload */ + } else { + offset = ofBase + BIT_readBitsFast(&seqState->DStream, ofBits/*>0*/); /* <= (ZSTD_WINDOWLOG_MAX-1) bits */ + if (MEM_32bits()) BIT_reloadDStream(&seqState->DStream); + } + seqState->prevOffset[2] = seqState->prevOffset[1]; + seqState->prevOffset[1] = seqState->prevOffset[0]; + seqState->prevOffset[0] = offset; + } else { + U32 const ll0 = (llBase == 0); + if (LIKELY((ofBits == 0))) { + if (LIKELY(!ll0)) + offset = seqState->prevOffset[0]; + else { + offset = seqState->prevOffset[1]; + seqState->prevOffset[1] = seqState->prevOffset[0]; + seqState->prevOffset[0] = offset; + } + } else { + offset = ofBase + ll0 + BIT_readBitsFast(&seqState->DStream, 1); + { size_t temp = (offset==3) ? seqState->prevOffset[0] - 1 : seqState->prevOffset[offset]; + temp += !temp; /* 0 is not valid; input is corrupted; force offset to 1 */ + if (offset != 1) seqState->prevOffset[2] = seqState->prevOffset[1]; + seqState->prevOffset[1] = seqState->prevOffset[0]; + seqState->prevOffset[0] = offset = temp; + } } } + seq.offset = offset; + } + + seq.matchLength = mlBase; + if (mlBits > 0) + seq.matchLength += BIT_readBitsFast(&seqState->DStream, mlBits/*>0*/); + + if (MEM_32bits() && (mlBits+llBits >= STREAM_ACCUMULATOR_MIN_32-LONG_OFFSETS_MAX_EXTRA_BITS_32)) + BIT_reloadDStream(&seqState->DStream); + if (MEM_64bits() && UNLIKELY(totalBits >= STREAM_ACCUMULATOR_MIN_64-(LLFSELog+MLFSELog+OffFSELog))) + BIT_reloadDStream(&seqState->DStream); + /* Ensure there are enough bits to read the rest of data in 64-bit mode. */ + ZSTD_STATIC_ASSERT(16+LLFSELog+MLFSELog+OffFSELog < STREAM_ACCUMULATOR_MIN_64); + + seq.litLength = llBase; + if (llBits > 0) + seq.litLength += BIT_readBitsFast(&seqState->DStream, llBits/*>0*/); + + if (MEM_32bits()) + BIT_reloadDStream(&seqState->DStream); + + DEBUGLOG(6, "seq: litL=%u, matchL=%u, offset=%u", + (U32)seq.litLength, (U32)seq.matchLength, (U32)seq.offset); + + /* ANS state update + * gcc-9.0.0 does 2.5% worse with ZSTD_updateFseStateWithDInfo(). + * clang-9.2.0 does 7% worse with ZSTD_updateFseState(). + * Naturally it seems like ZSTD_updateFseStateWithDInfo() should be the + * better option, so it is the default for other compilers. But, if you + * measure that it is worse, please put up a pull request. + */ + { +#if defined(__GNUC__) && !defined(__clang__) + const int kUseUpdateFseState = 1; +#else + const int kUseUpdateFseState = 0; +#endif + if (kUseUpdateFseState) { + ZSTD_updateFseState(&seqState->stateLL, &seqState->DStream); /* <= 9 bits */ + ZSTD_updateFseState(&seqState->stateML, &seqState->DStream); /* <= 9 bits */ + if (MEM_32bits()) BIT_reloadDStream(&seqState->DStream); /* <= 18 bits */ + ZSTD_updateFseState(&seqState->stateOffb, &seqState->DStream); /* <= 8 bits */ + } else { + ZSTD_updateFseStateWithDInfo(&seqState->stateLL, &seqState->DStream, llDInfo); /* <= 9 bits */ + ZSTD_updateFseStateWithDInfo(&seqState->stateML, &seqState->DStream, mlDInfo); /* <= 9 bits */ + if (MEM_32bits()) BIT_reloadDStream(&seqState->DStream); /* <= 18 bits */ + ZSTD_updateFseStateWithDInfo(&seqState->stateOffb, &seqState->DStream, ofDInfo); /* <= 8 bits */ + } + } + + return seq; +} + +#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION +MEM_STATIC int ZSTD_dictionaryIsActive(ZSTD_DCtx const* dctx, BYTE const* prefixStart, BYTE const* oLitEnd) +{ + size_t const windowSize = dctx->fParams.windowSize; + /* No dictionary used. */ + if (dctx->dictContentEndForFuzzing == NULL) return 0; + /* Dictionary is our prefix. */ + if (prefixStart == dctx->dictContentBeginForFuzzing) return 1; + /* Dictionary is not our ext-dict. */ + if (dctx->dictEnd != dctx->dictContentEndForFuzzing) return 0; + /* Dictionary is not within our window size. */ + if ((size_t)(oLitEnd - prefixStart) >= windowSize) return 0; + /* Dictionary is active. */ + return 1; +} + +MEM_STATIC void ZSTD_assertValidSequence( + ZSTD_DCtx const* dctx, + BYTE const* op, BYTE const* oend, + seq_t const seq, + BYTE const* prefixStart, BYTE const* virtualStart) +{ +#if DEBUGLEVEL >= 1 + size_t const windowSize = dctx->fParams.windowSize; + size_t const sequenceSize = seq.litLength + seq.matchLength; + BYTE const* const oLitEnd = op + seq.litLength; + DEBUGLOG(6, "Checking sequence: litL=%u matchL=%u offset=%u", + (U32)seq.litLength, (U32)seq.matchLength, (U32)seq.offset); + assert(op <= oend); + assert((size_t)(oend - op) >= sequenceSize); + assert(sequenceSize <= ZSTD_BLOCKSIZE_MAX); + if (ZSTD_dictionaryIsActive(dctx, prefixStart, oLitEnd)) { + size_t const dictSize = (size_t)((char const*)dctx->dictContentEndForFuzzing - (char const*)dctx->dictContentBeginForFuzzing); + /* Offset must be within the dictionary. */ + assert(seq.offset <= (size_t)(oLitEnd - virtualStart)); + assert(seq.offset <= windowSize + dictSize); + } else { + /* Offset must be within our window. */ + assert(seq.offset <= windowSize); + } +#else + (void)dctx, (void)op, (void)oend, (void)seq, (void)prefixStart, (void)virtualStart; +#endif +} +#endif + +#ifndef ZSTD_FORCE_DECOMPRESS_SEQUENCES_LONG +FORCE_INLINE_TEMPLATE size_t +DONT_VECTORIZE +ZSTD_decompressSequences_body( ZSTD_DCtx* dctx, + void* dst, size_t maxDstSize, + const void* seqStart, size_t seqSize, int nbSeq, + const ZSTD_longOffset_e isLongOffset, + const int frame) +{ + const BYTE* ip = (const BYTE*)seqStart; + const BYTE* const iend = ip + seqSize; + BYTE* const ostart = (BYTE*)dst; + BYTE* const oend = ostart + maxDstSize; + BYTE* op = ostart; + const BYTE* litPtr = dctx->litPtr; + const BYTE* const litEnd = litPtr + dctx->litSize; + const BYTE* const prefixStart = (const BYTE*) (dctx->prefixStart); + const BYTE* const vBase = (const BYTE*) (dctx->virtualStart); + const BYTE* const dictEnd = (const BYTE*) (dctx->dictEnd); + DEBUGLOG(5, "ZSTD_decompressSequences_body"); + (void)frame; + + /* Regen sequences */ + if (nbSeq) { + seqState_t seqState; + dctx->fseEntropy = 1; + { U32 i; for (i=0; ientropy.rep[i]; } + RETURN_ERROR_IF( + ERR_isError(BIT_initDStream(&seqState.DStream, ip, iend-ip)), + corruption_detected, ""); + ZSTD_initFseState(&seqState.stateLL, &seqState.DStream, dctx->LLTptr); + ZSTD_initFseState(&seqState.stateOffb, &seqState.DStream, dctx->OFTptr); + ZSTD_initFseState(&seqState.stateML, &seqState.DStream, dctx->MLTptr); + assert(dst != NULL); + + ZSTD_STATIC_ASSERT( + BIT_DStream_unfinished < BIT_DStream_completed && + BIT_DStream_endOfBuffer < BIT_DStream_completed && + BIT_DStream_completed < BIT_DStream_overflow); + +#if defined(__GNUC__) && defined(__x86_64__) + /* Align the decompression loop to 32 + 16 bytes. + * + * zstd compiled with gcc-9 on an Intel i9-9900k shows 10% decompression + * speed swings based on the alignment of the decompression loop. This + * performance swing is caused by parts of the decompression loop falling + * out of the DSB. The entire decompression loop should fit in the DSB, + * when it can't we get much worse performance. You can measure if you've + * hit the good case or the bad case with this perf command for some + * compressed file test.zst: + * + * perf stat -e cycles -e instructions -e idq.all_dsb_cycles_any_uops \ + * -e idq.all_mite_cycles_any_uops -- ./zstd -tq test.zst + * + * If you see most cycles served out of the MITE you've hit the bad case. + * If you see most cycles served out of the DSB you've hit the good case. + * If it is pretty even then you may be in an okay case. + * + * This issue has been reproduced on the following CPUs: + * - Kabylake: Macbook Pro (15-inch, 2019) 2.4 GHz Intel Core i9 + * Use Instruments->Counters to get DSB/MITE cycles. + * I never got performance swings, but I was able to + * go from the good case of mostly DSB to half of the + * cycles served from MITE. + * - Coffeelake: Intel i9-9900k + * - Coffeelake: Intel i7-9700k + * + * I haven't been able to reproduce the instability or DSB misses on any + * of the following CPUS: + * - Haswell + * - Broadwell: Intel(R) Xeon(R) CPU E5-2680 v4 @ 2.40GH + * - Skylake + * + * If you are seeing performance stability this script can help test. + * It tests on 4 commits in zstd where I saw performance change. + * + * https://gist.github.com/terrelln/9889fc06a423fd5ca6e99351564473f4 + */ + __asm__(".p2align 6"); + __asm__("nop"); + __asm__(".p2align 5"); + __asm__("nop"); +# if __GNUC__ >= 9 + /* better for gcc-9 and gcc-10, worse for clang and gcc-8 */ + __asm__(".p2align 3"); +# else + __asm__(".p2align 4"); +# endif +#endif + for ( ; ; ) { + seq_t const sequence = ZSTD_decodeSequence(&seqState, isLongOffset); + size_t const oneSeqSize = ZSTD_execSequence(op, oend, sequence, &litPtr, litEnd, prefixStart, vBase, dictEnd); +#if defined(FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION) && defined(FUZZING_ASSERT_VALID_SEQUENCE) + assert(!ZSTD_isError(oneSeqSize)); + if (frame) ZSTD_assertValidSequence(dctx, op, oend, sequence, prefixStart, vBase); +#endif + if (UNLIKELY(ZSTD_isError(oneSeqSize))) + return oneSeqSize; + DEBUGLOG(6, "regenerated sequence size : %u", (U32)oneSeqSize); + op += oneSeqSize; + if (UNLIKELY(!--nbSeq)) + break; + BIT_reloadDStream(&(seqState.DStream)); + } + + /* check if reached exact end */ + DEBUGLOG(5, "ZSTD_decompressSequences_body: after decode loop, remaining nbSeq : %i", nbSeq); + RETURN_ERROR_IF(nbSeq, corruption_detected, ""); + RETURN_ERROR_IF(BIT_reloadDStream(&seqState.DStream) < BIT_DStream_completed, corruption_detected, ""); + /* save reps for next block */ + { U32 i; for (i=0; ientropy.rep[i] = (U32)(seqState.prevOffset[i]); } + } + + /* last literal segment */ + { size_t const lastLLSize = litEnd - litPtr; + RETURN_ERROR_IF(lastLLSize > (size_t)(oend-op), dstSize_tooSmall, ""); + if (op != NULL) { + ZSTD_memcpy(op, litPtr, lastLLSize); + op += lastLLSize; + } + } + + return op-ostart; +} + +static size_t +ZSTD_decompressSequences_default(ZSTD_DCtx* dctx, + void* dst, size_t maxDstSize, + const void* seqStart, size_t seqSize, int nbSeq, + const ZSTD_longOffset_e isLongOffset, + const int frame) +{ + return ZSTD_decompressSequences_body(dctx, dst, maxDstSize, seqStart, seqSize, nbSeq, isLongOffset, frame); +} +#endif /* ZSTD_FORCE_DECOMPRESS_SEQUENCES_LONG */ + +#ifndef ZSTD_FORCE_DECOMPRESS_SEQUENCES_SHORT + +FORCE_INLINE_TEMPLATE size_t +ZSTD_prefetchMatch(size_t prefetchPos, seq_t const sequence, + const BYTE* const prefixStart, const BYTE* const dictEnd) +{ + prefetchPos += sequence.litLength; + { const BYTE* const matchBase = (sequence.offset > prefetchPos) ? dictEnd : prefixStart; + const BYTE* const match = matchBase + prefetchPos - sequence.offset; /* note : this operation can overflow when seq.offset is really too large, which can only happen when input is corrupted. + * No consequence though : memory address is only used for prefetching, not for dereferencing */ + PREFETCH_L1(match); PREFETCH_L1(match+CACHELINE_SIZE); /* note : it's safe to invoke PREFETCH() on any memory address, including invalid ones */ + } + return prefetchPos + sequence.matchLength; +} + +/* This decoding function employs prefetching + * to reduce latency impact of cache misses. + * It's generally employed when block contains a significant portion of long-distance matches + * or when coupled with a "cold" dictionary */ +FORCE_INLINE_TEMPLATE size_t +ZSTD_decompressSequencesLong_body( + ZSTD_DCtx* dctx, + void* dst, size_t maxDstSize, + const void* seqStart, size_t seqSize, int nbSeq, + const ZSTD_longOffset_e isLongOffset, + const int frame) +{ + const BYTE* ip = (const BYTE*)seqStart; + const BYTE* const iend = ip + seqSize; + BYTE* const ostart = (BYTE*)dst; + BYTE* const oend = ostart + maxDstSize; + BYTE* op = ostart; + const BYTE* litPtr = dctx->litPtr; + const BYTE* const litEnd = litPtr + dctx->litSize; + const BYTE* const prefixStart = (const BYTE*) (dctx->prefixStart); + const BYTE* const dictStart = (const BYTE*) (dctx->virtualStart); + const BYTE* const dictEnd = (const BYTE*) (dctx->dictEnd); + (void)frame; + + /* Regen sequences */ + if (nbSeq) { +#define STORED_SEQS 8 +#define STORED_SEQS_MASK (STORED_SEQS-1) +#define ADVANCED_SEQS STORED_SEQS + seq_t sequences[STORED_SEQS]; + int const seqAdvance = MIN(nbSeq, ADVANCED_SEQS); + seqState_t seqState; + int seqNb; + size_t prefetchPos = (size_t)(op-prefixStart); /* track position relative to prefixStart */ + + dctx->fseEntropy = 1; + { int i; for (i=0; ientropy.rep[i]; } + assert(dst != NULL); + assert(iend >= ip); + RETURN_ERROR_IF( + ERR_isError(BIT_initDStream(&seqState.DStream, ip, iend-ip)), + corruption_detected, ""); + ZSTD_initFseState(&seqState.stateLL, &seqState.DStream, dctx->LLTptr); + ZSTD_initFseState(&seqState.stateOffb, &seqState.DStream, dctx->OFTptr); + ZSTD_initFseState(&seqState.stateML, &seqState.DStream, dctx->MLTptr); + + /* prepare in advance */ + for (seqNb=0; (BIT_reloadDStream(&seqState.DStream) <= BIT_DStream_completed) && (seqNbentropy.rep[i] = (U32)(seqState.prevOffset[i]); } + } + + /* last literal segment */ + { size_t const lastLLSize = litEnd - litPtr; + RETURN_ERROR_IF(lastLLSize > (size_t)(oend-op), dstSize_tooSmall, ""); + if (op != NULL) { + ZSTD_memcpy(op, litPtr, lastLLSize); + op += lastLLSize; + } + } + + return op-ostart; +} + +static size_t +ZSTD_decompressSequencesLong_default(ZSTD_DCtx* dctx, + void* dst, size_t maxDstSize, + const void* seqStart, size_t seqSize, int nbSeq, + const ZSTD_longOffset_e isLongOffset, + const int frame) +{ + return ZSTD_decompressSequencesLong_body(dctx, dst, maxDstSize, seqStart, seqSize, nbSeq, isLongOffset, frame); +} +#endif /* ZSTD_FORCE_DECOMPRESS_SEQUENCES_SHORT */ + + + +#if DYNAMIC_BMI2 + +#ifndef ZSTD_FORCE_DECOMPRESS_SEQUENCES_LONG +static TARGET_ATTRIBUTE("bmi2") size_t +DONT_VECTORIZE +ZSTD_decompressSequences_bmi2(ZSTD_DCtx* dctx, + void* dst, size_t maxDstSize, + const void* seqStart, size_t seqSize, int nbSeq, + const ZSTD_longOffset_e isLongOffset, + const int frame) +{ + return ZSTD_decompressSequences_body(dctx, dst, maxDstSize, seqStart, seqSize, nbSeq, isLongOffset, frame); +} +#endif /* ZSTD_FORCE_DECOMPRESS_SEQUENCES_LONG */ + +#ifndef ZSTD_FORCE_DECOMPRESS_SEQUENCES_SHORT +static TARGET_ATTRIBUTE("bmi2") size_t +ZSTD_decompressSequencesLong_bmi2(ZSTD_DCtx* dctx, + void* dst, size_t maxDstSize, + const void* seqStart, size_t seqSize, int nbSeq, + const ZSTD_longOffset_e isLongOffset, + const int frame) +{ + return ZSTD_decompressSequencesLong_body(dctx, dst, maxDstSize, seqStart, seqSize, nbSeq, isLongOffset, frame); +} +#endif /* ZSTD_FORCE_DECOMPRESS_SEQUENCES_SHORT */ + +#endif /* DYNAMIC_BMI2 */ + +typedef size_t (*ZSTD_decompressSequences_t)( + ZSTD_DCtx* dctx, + void* dst, size_t maxDstSize, + const void* seqStart, size_t seqSize, int nbSeq, + const ZSTD_longOffset_e isLongOffset, + const int frame); + +#ifndef ZSTD_FORCE_DECOMPRESS_SEQUENCES_LONG +static size_t +ZSTD_decompressSequences(ZSTD_DCtx* dctx, void* dst, size_t maxDstSize, + const void* seqStart, size_t seqSize, int nbSeq, + const ZSTD_longOffset_e isLongOffset, + const int frame) +{ + DEBUGLOG(5, "ZSTD_decompressSequences"); +#if DYNAMIC_BMI2 + if (dctx->bmi2) { + return ZSTD_decompressSequences_bmi2(dctx, dst, maxDstSize, seqStart, seqSize, nbSeq, isLongOffset, frame); + } +#endif + return ZSTD_decompressSequences_default(dctx, dst, maxDstSize, seqStart, seqSize, nbSeq, isLongOffset, frame); +} +#endif /* ZSTD_FORCE_DECOMPRESS_SEQUENCES_LONG */ + + +#ifndef ZSTD_FORCE_DECOMPRESS_SEQUENCES_SHORT +/* ZSTD_decompressSequencesLong() : + * decompression function triggered when a minimum share of offsets is considered "long", + * aka out of cache. + * note : "long" definition seems overloaded here, sometimes meaning "wider than bitstream register", and sometimes meaning "farther than memory cache distance". + * This function will try to mitigate main memory latency through the use of prefetching */ +static size_t +ZSTD_decompressSequencesLong(ZSTD_DCtx* dctx, + void* dst, size_t maxDstSize, + const void* seqStart, size_t seqSize, int nbSeq, + const ZSTD_longOffset_e isLongOffset, + const int frame) +{ + DEBUGLOG(5, "ZSTD_decompressSequencesLong"); +#if DYNAMIC_BMI2 + if (dctx->bmi2) { + return ZSTD_decompressSequencesLong_bmi2(dctx, dst, maxDstSize, seqStart, seqSize, nbSeq, isLongOffset, frame); + } +#endif + return ZSTD_decompressSequencesLong_default(dctx, dst, maxDstSize, seqStart, seqSize, nbSeq, isLongOffset, frame); +} +#endif /* ZSTD_FORCE_DECOMPRESS_SEQUENCES_SHORT */ + + + +#if !defined(ZSTD_FORCE_DECOMPRESS_SEQUENCES_SHORT) && \ + !defined(ZSTD_FORCE_DECOMPRESS_SEQUENCES_LONG) +/* ZSTD_getLongOffsetsShare() : + * condition : offTable must be valid + * @return : "share" of long offsets (arbitrarily defined as > (1<<23)) + * compared to maximum possible of (1< 22) total += 1; + } + + assert(tableLog <= OffFSELog); + total <<= (OffFSELog - tableLog); /* scale to OffFSELog */ + + return total; +} +#endif + +size_t +ZSTD_decompressBlock_internal(ZSTD_DCtx* dctx, + void* dst, size_t dstCapacity, + const void* src, size_t srcSize, const int frame) +{ /* blockType == blockCompressed */ + const BYTE* ip = (const BYTE*)src; + /* isLongOffset must be true if there are long offsets. + * Offsets are long if they are larger than 2^STREAM_ACCUMULATOR_MIN. + * We don't expect that to be the case in 64-bit mode. + * In block mode, window size is not known, so we have to be conservative. + * (note: but it could be evaluated from current-lowLimit) + */ + ZSTD_longOffset_e const isLongOffset = (ZSTD_longOffset_e)(MEM_32bits() && (!frame || (dctx->fParams.windowSize > (1ULL << STREAM_ACCUMULATOR_MIN)))); + DEBUGLOG(5, "ZSTD_decompressBlock_internal (size : %u)", (U32)srcSize); + + RETURN_ERROR_IF(srcSize >= ZSTD_BLOCKSIZE_MAX, srcSize_wrong, ""); + + /* Decode literals section */ + { size_t const litCSize = ZSTD_decodeLiteralsBlock(dctx, src, srcSize); + DEBUGLOG(5, "ZSTD_decodeLiteralsBlock : %u", (U32)litCSize); + if (ZSTD_isError(litCSize)) return litCSize; + ip += litCSize; + srcSize -= litCSize; + } + + /* Build Decoding Tables */ + { + /* These macros control at build-time which decompressor implementation + * we use. If neither is defined, we do some inspection and dispatch at + * runtime. + */ +#if !defined(ZSTD_FORCE_DECOMPRESS_SEQUENCES_SHORT) && \ + !defined(ZSTD_FORCE_DECOMPRESS_SEQUENCES_LONG) + int usePrefetchDecoder = dctx->ddictIsCold; +#endif + int nbSeq; + size_t const seqHSize = ZSTD_decodeSeqHeaders(dctx, &nbSeq, ip, srcSize); + if (ZSTD_isError(seqHSize)) return seqHSize; + ip += seqHSize; + srcSize -= seqHSize; + + RETURN_ERROR_IF(dst == NULL && nbSeq > 0, dstSize_tooSmall, "NULL not handled"); + +#if !defined(ZSTD_FORCE_DECOMPRESS_SEQUENCES_SHORT) && \ + !defined(ZSTD_FORCE_DECOMPRESS_SEQUENCES_LONG) + if ( !usePrefetchDecoder + && (!frame || (dctx->fParams.windowSize > (1<<24))) + && (nbSeq>ADVANCED_SEQS) ) { /* could probably use a larger nbSeq limit */ + U32 const shareLongOffsets = ZSTD_getLongOffsetsShare(dctx->OFTptr); + U32 const minShare = MEM_64bits() ? 7 : 20; /* heuristic values, correspond to 2.73% and 7.81% */ + usePrefetchDecoder = (shareLongOffsets >= minShare); + } +#endif + + dctx->ddictIsCold = 0; + +#if !defined(ZSTD_FORCE_DECOMPRESS_SEQUENCES_SHORT) && \ + !defined(ZSTD_FORCE_DECOMPRESS_SEQUENCES_LONG) + if (usePrefetchDecoder) +#endif +#ifndef ZSTD_FORCE_DECOMPRESS_SEQUENCES_SHORT + return ZSTD_decompressSequencesLong(dctx, dst, dstCapacity, ip, srcSize, nbSeq, isLongOffset, frame); +#endif + +#ifndef ZSTD_FORCE_DECOMPRESS_SEQUENCES_LONG + /* else */ + return ZSTD_decompressSequences(dctx, dst, dstCapacity, ip, srcSize, nbSeq, isLongOffset, frame); +#endif + } +} + + +void ZSTD_checkContinuity(ZSTD_DCtx* dctx, const void* dst, size_t dstSize) +{ + if (dst != dctx->previousDstEnd && dstSize > 0) { /* not contiguous */ + dctx->dictEnd = dctx->previousDstEnd; + dctx->virtualStart = (const char*)dst - ((const char*)(dctx->previousDstEnd) - (const char*)(dctx->prefixStart)); + dctx->prefixStart = dst; + dctx->previousDstEnd = dst; + } +} + + +size_t ZSTD_decompressBlock(ZSTD_DCtx* dctx, + void* dst, size_t dstCapacity, + const void* src, size_t srcSize) +{ + size_t dSize; + ZSTD_checkContinuity(dctx, dst, dstCapacity); + dSize = ZSTD_decompressBlock_internal(dctx, dst, dstCapacity, src, srcSize, /* frame */ 0); + dctx->previousDstEnd = (char*)dst + dSize; + return dSize; +} diff --git a/external/zstd/lib/decompress/zstd_decompress_block.h b/external/zstd/lib/decompress/zstd_decompress_block.h new file mode 100644 index 00000000..049a0cd8 --- /dev/null +++ b/external/zstd/lib/decompress/zstd_decompress_block.h @@ -0,0 +1,62 @@ +/* + * Copyright (c) Yann Collet, Facebook, Inc. + * All rights reserved. + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. + */ + + +#ifndef ZSTD_DEC_BLOCK_H +#define ZSTD_DEC_BLOCK_H + +/*-******************************************************* + * Dependencies + *********************************************************/ +#include "../common/zstd_deps.h" /* size_t */ +#include "../zstd.h" /* DCtx, and some public functions */ +#include "../common/zstd_internal.h" /* blockProperties_t, and some public functions */ +#include "zstd_decompress_internal.h" /* ZSTD_seqSymbol */ + + +/* === Prototypes === */ + +/* note: prototypes already published within `zstd.h` : + * ZSTD_decompressBlock() + */ + +/* note: prototypes already published within `zstd_internal.h` : + * ZSTD_getcBlockSize() + * ZSTD_decodeSeqHeaders() + */ + + +/* ZSTD_decompressBlock_internal() : + * decompress block, starting at `src`, + * into destination buffer `dst`. + * @return : decompressed block size, + * or an error code (which can be tested using ZSTD_isError()) + */ +size_t ZSTD_decompressBlock_internal(ZSTD_DCtx* dctx, + void* dst, size_t dstCapacity, + const void* src, size_t srcSize, const int frame); + +/* ZSTD_buildFSETable() : + * generate FSE decoding table for one symbol (ll, ml or off) + * this function must be called with valid parameters only + * (dt is large enough, normalizedCounter distribution total is a power of 2, max is within range, etc.) + * in which case it cannot fail. + * The workspace must be 4-byte aligned and at least ZSTD_BUILD_FSE_TABLE_WKSP_SIZE bytes, which is + * defined in zstd_decompress_internal.h. + * Internal use only. + */ +void ZSTD_buildFSETable(ZSTD_seqSymbol* dt, + const short* normalizedCounter, unsigned maxSymbolValue, + const U32* baseValue, const U32* nbAdditionalBits, + unsigned tableLog, void* wksp, size_t wkspSize, + int bmi2); + + +#endif /* ZSTD_DEC_BLOCK_H */ diff --git a/external/zstd/lib/decompress/zstd_decompress_internal.h b/external/zstd/lib/decompress/zstd_decompress_internal.h new file mode 100644 index 00000000..ebda0c90 --- /dev/null +++ b/external/zstd/lib/decompress/zstd_decompress_internal.h @@ -0,0 +1,205 @@ +/* + * Copyright (c) Yann Collet, Facebook, Inc. + * All rights reserved. + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. + */ + + +/* zstd_decompress_internal: + * objects and definitions shared within lib/decompress modules */ + + #ifndef ZSTD_DECOMPRESS_INTERNAL_H + #define ZSTD_DECOMPRESS_INTERNAL_H + + +/*-******************************************************* + * Dependencies + *********************************************************/ +#include "../common/mem.h" /* BYTE, U16, U32 */ +#include "../common/zstd_internal.h" /* ZSTD_seqSymbol */ + + + +/*-******************************************************* + * Constants + *********************************************************/ +static UNUSED_ATTR const U32 LL_base[MaxLL+1] = { + 0, 1, 2, 3, 4, 5, 6, 7, + 8, 9, 10, 11, 12, 13, 14, 15, + 16, 18, 20, 22, 24, 28, 32, 40, + 48, 64, 0x80, 0x100, 0x200, 0x400, 0x800, 0x1000, + 0x2000, 0x4000, 0x8000, 0x10000 }; + +static UNUSED_ATTR const U32 OF_base[MaxOff+1] = { + 0, 1, 1, 5, 0xD, 0x1D, 0x3D, 0x7D, + 0xFD, 0x1FD, 0x3FD, 0x7FD, 0xFFD, 0x1FFD, 0x3FFD, 0x7FFD, + 0xFFFD, 0x1FFFD, 0x3FFFD, 0x7FFFD, 0xFFFFD, 0x1FFFFD, 0x3FFFFD, 0x7FFFFD, + 0xFFFFFD, 0x1FFFFFD, 0x3FFFFFD, 0x7FFFFFD, 0xFFFFFFD, 0x1FFFFFFD, 0x3FFFFFFD, 0x7FFFFFFD }; + +static UNUSED_ATTR const U32 OF_bits[MaxOff+1] = { + 0, 1, 2, 3, 4, 5, 6, 7, + 8, 9, 10, 11, 12, 13, 14, 15, + 16, 17, 18, 19, 20, 21, 22, 23, + 24, 25, 26, 27, 28, 29, 30, 31 }; + +static UNUSED_ATTR const U32 ML_base[MaxML+1] = { + 3, 4, 5, 6, 7, 8, 9, 10, + 11, 12, 13, 14, 15, 16, 17, 18, + 19, 20, 21, 22, 23, 24, 25, 26, + 27, 28, 29, 30, 31, 32, 33, 34, + 35, 37, 39, 41, 43, 47, 51, 59, + 67, 83, 99, 0x83, 0x103, 0x203, 0x403, 0x803, + 0x1003, 0x2003, 0x4003, 0x8003, 0x10003 }; + + +/*-******************************************************* + * Decompression types + *********************************************************/ + typedef struct { + U32 fastMode; + U32 tableLog; + } ZSTD_seqSymbol_header; + + typedef struct { + U16 nextState; + BYTE nbAdditionalBits; + BYTE nbBits; + U32 baseValue; + } ZSTD_seqSymbol; + + #define SEQSYMBOL_TABLE_SIZE(log) (1 + (1 << (log))) + +#define ZSTD_BUILD_FSE_TABLE_WKSP_SIZE (sizeof(S16) * (MaxSeq + 1) + (1u << MaxFSELog) + sizeof(U64)) +#define ZSTD_BUILD_FSE_TABLE_WKSP_SIZE_U32 ((ZSTD_BUILD_FSE_TABLE_WKSP_SIZE + sizeof(U32) - 1) / sizeof(U32)) + +typedef struct { + ZSTD_seqSymbol LLTable[SEQSYMBOL_TABLE_SIZE(LLFSELog)]; /* Note : Space reserved for FSE Tables */ + ZSTD_seqSymbol OFTable[SEQSYMBOL_TABLE_SIZE(OffFSELog)]; /* is also used as temporary workspace while building hufTable during DDict creation */ + ZSTD_seqSymbol MLTable[SEQSYMBOL_TABLE_SIZE(MLFSELog)]; /* and therefore must be at least HUF_DECOMPRESS_WORKSPACE_SIZE large */ + HUF_DTable hufTable[HUF_DTABLE_SIZE(HufLog)]; /* can accommodate HUF_decompress4X */ + U32 rep[ZSTD_REP_NUM]; + U32 workspace[ZSTD_BUILD_FSE_TABLE_WKSP_SIZE_U32]; +} ZSTD_entropyDTables_t; + +typedef enum { ZSTDds_getFrameHeaderSize, ZSTDds_decodeFrameHeader, + ZSTDds_decodeBlockHeader, ZSTDds_decompressBlock, + ZSTDds_decompressLastBlock, ZSTDds_checkChecksum, + ZSTDds_decodeSkippableHeader, ZSTDds_skipFrame } ZSTD_dStage; + +typedef enum { zdss_init=0, zdss_loadHeader, + zdss_read, zdss_load, zdss_flush } ZSTD_dStreamStage; + +typedef enum { + ZSTD_use_indefinitely = -1, /* Use the dictionary indefinitely */ + ZSTD_dont_use = 0, /* Do not use the dictionary (if one exists free it) */ + ZSTD_use_once = 1 /* Use the dictionary once and set to ZSTD_dont_use */ +} ZSTD_dictUses_e; + +/* Hashset for storing references to multiple ZSTD_DDict within ZSTD_DCtx */ +typedef struct { + const ZSTD_DDict** ddictPtrTable; + size_t ddictPtrTableSize; + size_t ddictPtrCount; +} ZSTD_DDictHashSet; + +struct ZSTD_DCtx_s +{ + const ZSTD_seqSymbol* LLTptr; + const ZSTD_seqSymbol* MLTptr; + const ZSTD_seqSymbol* OFTptr; + const HUF_DTable* HUFptr; + ZSTD_entropyDTables_t entropy; + U32 workspace[HUF_DECOMPRESS_WORKSPACE_SIZE_U32]; /* space needed when building huffman tables */ + const void* previousDstEnd; /* detect continuity */ + const void* prefixStart; /* start of current segment */ + const void* virtualStart; /* virtual start of previous segment if it was just before current one */ + const void* dictEnd; /* end of previous segment */ + size_t expected; + ZSTD_frameHeader fParams; + U64 processedCSize; + U64 decodedSize; + blockType_e bType; /* used in ZSTD_decompressContinue(), store blockType between block header decoding and block decompression stages */ + ZSTD_dStage stage; + U32 litEntropy; + U32 fseEntropy; + XXH64_state_t xxhState; + size_t headerSize; + ZSTD_format_e format; + ZSTD_forceIgnoreChecksum_e forceIgnoreChecksum; /* User specified: if == 1, will ignore checksums in compressed frame. Default == 0 */ + U32 validateChecksum; /* if == 1, will validate checksum. Is == 1 if (fParams.checksumFlag == 1) and (forceIgnoreChecksum == 0). */ + const BYTE* litPtr; + ZSTD_customMem customMem; + size_t litSize; + size_t rleSize; + size_t staticSize; + int bmi2; /* == 1 if the CPU supports BMI2 and 0 otherwise. CPU support is determined dynamically once per context lifetime. */ + + /* dictionary */ + ZSTD_DDict* ddictLocal; + const ZSTD_DDict* ddict; /* set by ZSTD_initDStream_usingDDict(), or ZSTD_DCtx_refDDict() */ + U32 dictID; + int ddictIsCold; /* if == 1 : dictionary is "new" for working context, and presumed "cold" (not in cpu cache) */ + ZSTD_dictUses_e dictUses; + ZSTD_DDictHashSet* ddictSet; /* Hash set for multiple ddicts */ + ZSTD_refMultipleDDicts_e refMultipleDDicts; /* User specified: if == 1, will allow references to multiple DDicts. Default == 0 (disabled) */ + + /* streaming */ + ZSTD_dStreamStage streamStage; + char* inBuff; + size_t inBuffSize; + size_t inPos; + size_t maxWindowSize; + char* outBuff; + size_t outBuffSize; + size_t outStart; + size_t outEnd; + size_t lhSize; + void* legacyContext; + U32 previousLegacyVersion; + U32 legacyVersion; + U32 hostageByte; + int noForwardProgress; + ZSTD_bufferMode_e outBufferMode; + ZSTD_outBuffer expectedOutBuffer; + + /* workspace */ + BYTE litBuffer[ZSTD_BLOCKSIZE_MAX + WILDCOPY_OVERLENGTH]; + BYTE headerBuffer[ZSTD_FRAMEHEADERSIZE_MAX]; + + size_t oversizedDuration; + +#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION + void const* dictContentBeginForFuzzing; + void const* dictContentEndForFuzzing; +#endif + + /* Tracing */ +#if ZSTD_TRACE + ZSTD_TraceCtx traceCtx; +#endif +}; /* typedef'd to ZSTD_DCtx within "zstd.h" */ + + +/*-******************************************************* + * Shared internal functions + *********************************************************/ + +/*! ZSTD_loadDEntropy() : + * dict : must point at beginning of a valid zstd dictionary. + * @return : size of dictionary header (size of magic number + dict ID + entropy tables) */ +size_t ZSTD_loadDEntropy(ZSTD_entropyDTables_t* entropy, + const void* const dict, size_t const dictSize); + +/*! ZSTD_checkContinuity() : + * check if next `dst` follows previous position, where decompression ended. + * If yes, do nothing (continue on current segment). + * If not, classify previous segment as "external dictionary", and start a new segment. + * This function cannot fail. */ +void ZSTD_checkContinuity(ZSTD_DCtx* dctx, const void* dst, size_t dstSize); + + +#endif /* ZSTD_DECOMPRESS_INTERNAL_H */ diff --git a/external/zstd/lib/deprecated/zbuff.h b/external/zstd/lib/deprecated/zbuff.h new file mode 100644 index 00000000..b83ea0fe --- /dev/null +++ b/external/zstd/lib/deprecated/zbuff.h @@ -0,0 +1,214 @@ +/* + * Copyright (c) Yann Collet, Facebook, Inc. + * All rights reserved. + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. + */ + +/* *************************************************************** +* NOTES/WARNINGS +******************************************************************/ +/* The streaming API defined here is deprecated. + * Consider migrating towards ZSTD_compressStream() API in `zstd.h` + * See 'lib/README.md'. + *****************************************************************/ + + +#if defined (__cplusplus) +extern "C" { +#endif + +#ifndef ZSTD_BUFFERED_H_23987 +#define ZSTD_BUFFERED_H_23987 + +/* ************************************* +* Dependencies +***************************************/ +#include /* size_t */ +#include "../zstd.h" /* ZSTD_CStream, ZSTD_DStream, ZSTDLIB_API */ + + +/* *************************************************************** +* Compiler specifics +*****************************************************************/ +/* Deprecation warnings */ +/* Should these warnings be a problem, + * it is generally possible to disable them, + * typically with -Wno-deprecated-declarations for gcc + * or _CRT_SECURE_NO_WARNINGS in Visual. + * Otherwise, it's also possible to define ZBUFF_DISABLE_DEPRECATE_WARNINGS + */ +#ifdef ZBUFF_DISABLE_DEPRECATE_WARNINGS +# define ZBUFF_DEPRECATED(message) ZSTDLIB_API /* disable deprecation warnings */ +#else +# if defined (__cplusplus) && (__cplusplus >= 201402) /* C++14 or greater */ +# define ZBUFF_DEPRECATED(message) [[deprecated(message)]] ZSTDLIB_API +# elif (defined(GNUC) && (GNUC > 4 || (GNUC == 4 && GNUC_MINOR >= 5))) || defined(__clang__) +# define ZBUFF_DEPRECATED(message) ZSTDLIB_API __attribute__((deprecated(message))) +# elif defined(__GNUC__) && (__GNUC__ >= 3) +# define ZBUFF_DEPRECATED(message) ZSTDLIB_API __attribute__((deprecated)) +# elif defined(_MSC_VER) +# define ZBUFF_DEPRECATED(message) ZSTDLIB_API __declspec(deprecated(message)) +# else +# pragma message("WARNING: You need to implement ZBUFF_DEPRECATED for this compiler") +# define ZBUFF_DEPRECATED(message) ZSTDLIB_API +# endif +#endif /* ZBUFF_DISABLE_DEPRECATE_WARNINGS */ + + +/* ************************************* +* Streaming functions +***************************************/ +/* This is the easier "buffered" streaming API, +* using an internal buffer to lift all restrictions on user-provided buffers +* which can be any size, any place, for both input and output. +* ZBUFF and ZSTD are 100% interoperable, +* frames created by one can be decoded by the other one */ + +typedef ZSTD_CStream ZBUFF_CCtx; +ZBUFF_DEPRECATED("use ZSTD_createCStream") ZBUFF_CCtx* ZBUFF_createCCtx(void); +ZBUFF_DEPRECATED("use ZSTD_freeCStream") size_t ZBUFF_freeCCtx(ZBUFF_CCtx* cctx); + +ZBUFF_DEPRECATED("use ZSTD_initCStream") size_t ZBUFF_compressInit(ZBUFF_CCtx* cctx, int compressionLevel); +ZBUFF_DEPRECATED("use ZSTD_initCStream_usingDict") size_t ZBUFF_compressInitDictionary(ZBUFF_CCtx* cctx, const void* dict, size_t dictSize, int compressionLevel); + +ZBUFF_DEPRECATED("use ZSTD_compressStream") size_t ZBUFF_compressContinue(ZBUFF_CCtx* cctx, void* dst, size_t* dstCapacityPtr, const void* src, size_t* srcSizePtr); +ZBUFF_DEPRECATED("use ZSTD_flushStream") size_t ZBUFF_compressFlush(ZBUFF_CCtx* cctx, void* dst, size_t* dstCapacityPtr); +ZBUFF_DEPRECATED("use ZSTD_endStream") size_t ZBUFF_compressEnd(ZBUFF_CCtx* cctx, void* dst, size_t* dstCapacityPtr); + +/*-************************************************* +* Streaming compression - howto +* +* A ZBUFF_CCtx object is required to track streaming operation. +* Use ZBUFF_createCCtx() and ZBUFF_freeCCtx() to create/release resources. +* ZBUFF_CCtx objects can be reused multiple times. +* +* Start by initializing ZBUF_CCtx. +* Use ZBUFF_compressInit() to start a new compression operation. +* Use ZBUFF_compressInitDictionary() for a compression which requires a dictionary. +* +* Use ZBUFF_compressContinue() repetitively to consume input stream. +* *srcSizePtr and *dstCapacityPtr can be any size. +* The function will report how many bytes were read or written within *srcSizePtr and *dstCapacityPtr. +* Note that it may not consume the entire input, in which case it's up to the caller to present again remaining data. +* The content of `dst` will be overwritten (up to *dstCapacityPtr) at each call, so save its content if it matters or change @dst . +* @return : a hint to preferred nb of bytes to use as input for next function call (it's just a hint, to improve latency) +* or an error code, which can be tested using ZBUFF_isError(). +* +* At any moment, it's possible to flush whatever data remains within buffer, using ZBUFF_compressFlush(). +* The nb of bytes written into `dst` will be reported into *dstCapacityPtr. +* Note that the function cannot output more than *dstCapacityPtr, +* therefore, some content might still be left into internal buffer if *dstCapacityPtr is too small. +* @return : nb of bytes still present into internal buffer (0 if it's empty) +* or an error code, which can be tested using ZBUFF_isError(). +* +* ZBUFF_compressEnd() instructs to finish a frame. +* It will perform a flush and write frame epilogue. +* The epilogue is required for decoders to consider a frame completed. +* Similar to ZBUFF_compressFlush(), it may not be able to output the entire internal buffer content if *dstCapacityPtr is too small. +* In which case, call again ZBUFF_compressFlush() to complete the flush. +* @return : nb of bytes still present into internal buffer (0 if it's empty) +* or an error code, which can be tested using ZBUFF_isError(). +* +* Hint : _recommended buffer_ sizes (not compulsory) : ZBUFF_recommendedCInSize() / ZBUFF_recommendedCOutSize() +* input : ZBUFF_recommendedCInSize==128 KB block size is the internal unit, use this value to reduce intermediate stages (better latency) +* output : ZBUFF_recommendedCOutSize==ZSTD_compressBound(128 KB) + 3 + 3 : ensures it's always possible to write/flush/end a full block. Skip some buffering. +* By using both, it ensures that input will be entirely consumed, and output will always contain the result, reducing intermediate buffering. +* **************************************************/ + + +typedef ZSTD_DStream ZBUFF_DCtx; +ZBUFF_DEPRECATED("use ZSTD_createDStream") ZBUFF_DCtx* ZBUFF_createDCtx(void); +ZBUFF_DEPRECATED("use ZSTD_freeDStream") size_t ZBUFF_freeDCtx(ZBUFF_DCtx* dctx); + +ZBUFF_DEPRECATED("use ZSTD_initDStream") size_t ZBUFF_decompressInit(ZBUFF_DCtx* dctx); +ZBUFF_DEPRECATED("use ZSTD_initDStream_usingDict") size_t ZBUFF_decompressInitDictionary(ZBUFF_DCtx* dctx, const void* dict, size_t dictSize); + +ZBUFF_DEPRECATED("use ZSTD_decompressStream") size_t ZBUFF_decompressContinue(ZBUFF_DCtx* dctx, + void* dst, size_t* dstCapacityPtr, + const void* src, size_t* srcSizePtr); + +/*-*************************************************************************** +* Streaming decompression howto +* +* A ZBUFF_DCtx object is required to track streaming operations. +* Use ZBUFF_createDCtx() and ZBUFF_freeDCtx() to create/release resources. +* Use ZBUFF_decompressInit() to start a new decompression operation, +* or ZBUFF_decompressInitDictionary() if decompression requires a dictionary. +* Note that ZBUFF_DCtx objects can be re-init multiple times. +* +* Use ZBUFF_decompressContinue() repetitively to consume your input. +* *srcSizePtr and *dstCapacityPtr can be any size. +* The function will report how many bytes were read or written by modifying *srcSizePtr and *dstCapacityPtr. +* Note that it may not consume the entire input, in which case it's up to the caller to present remaining input again. +* The content of `dst` will be overwritten (up to *dstCapacityPtr) at each function call, so save its content if it matters, or change `dst`. +* @return : 0 when a frame is completely decoded and fully flushed, +* 1 when there is still some data left within internal buffer to flush, +* >1 when more data is expected, with value being a suggested next input size (it's just a hint, which helps latency), +* or an error code, which can be tested using ZBUFF_isError(). +* +* Hint : recommended buffer sizes (not compulsory) : ZBUFF_recommendedDInSize() and ZBUFF_recommendedDOutSize() +* output : ZBUFF_recommendedDOutSize== 128 KB block size is the internal unit, it ensures it's always possible to write a full block when decoded. +* input : ZBUFF_recommendedDInSize == 128KB + 3; +* just follow indications from ZBUFF_decompressContinue() to minimize latency. It should always be <= 128 KB + 3 . +* *******************************************************************************/ + + +/* ************************************* +* Tool functions +***************************************/ +ZBUFF_DEPRECATED("use ZSTD_isError") unsigned ZBUFF_isError(size_t errorCode); +ZBUFF_DEPRECATED("use ZSTD_getErrorName") const char* ZBUFF_getErrorName(size_t errorCode); + +/** Functions below provide recommended buffer sizes for Compression or Decompression operations. +* These sizes are just hints, they tend to offer better latency */ +ZBUFF_DEPRECATED("use ZSTD_CStreamInSize") size_t ZBUFF_recommendedCInSize(void); +ZBUFF_DEPRECATED("use ZSTD_CStreamOutSize") size_t ZBUFF_recommendedCOutSize(void); +ZBUFF_DEPRECATED("use ZSTD_DStreamInSize") size_t ZBUFF_recommendedDInSize(void); +ZBUFF_DEPRECATED("use ZSTD_DStreamOutSize") size_t ZBUFF_recommendedDOutSize(void); + +#endif /* ZSTD_BUFFERED_H_23987 */ + + +#ifdef ZBUFF_STATIC_LINKING_ONLY +#ifndef ZBUFF_STATIC_H_30298098432 +#define ZBUFF_STATIC_H_30298098432 + +/* ==================================================================================== + * The definitions in this section are considered experimental. + * They should never be used in association with a dynamic library, as they may change in the future. + * They are provided for advanced usages. + * Use them only in association with static linking. + * ==================================================================================== */ + +/*--- Dependency ---*/ +#define ZSTD_STATIC_LINKING_ONLY /* ZSTD_parameters, ZSTD_customMem */ +#include "../zstd.h" + + +/*--- Custom memory allocator ---*/ +/*! ZBUFF_createCCtx_advanced() : + * Create a ZBUFF compression context using external alloc and free functions */ +ZBUFF_DEPRECATED("use ZSTD_createCStream_advanced") ZBUFF_CCtx* ZBUFF_createCCtx_advanced(ZSTD_customMem customMem); + +/*! ZBUFF_createDCtx_advanced() : + * Create a ZBUFF decompression context using external alloc and free functions */ +ZBUFF_DEPRECATED("use ZSTD_createDStream_advanced") ZBUFF_DCtx* ZBUFF_createDCtx_advanced(ZSTD_customMem customMem); + + +/*--- Advanced Streaming Initialization ---*/ +ZBUFF_DEPRECATED("use ZSTD_initDStream_usingDict") size_t ZBUFF_compressInit_advanced(ZBUFF_CCtx* zbc, + const void* dict, size_t dictSize, + ZSTD_parameters params, unsigned long long pledgedSrcSize); + + +#endif /* ZBUFF_STATIC_H_30298098432 */ +#endif /* ZBUFF_STATIC_LINKING_ONLY */ + + +#if defined (__cplusplus) +} +#endif diff --git a/external/zstd/lib/deprecated/zbuff_common.c b/external/zstd/lib/deprecated/zbuff_common.c new file mode 100644 index 00000000..e7d01a08 --- /dev/null +++ b/external/zstd/lib/deprecated/zbuff_common.c @@ -0,0 +1,26 @@ +/* + * Copyright (c) Yann Collet, Facebook, Inc. + * All rights reserved. + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. + */ + +/*-************************************* +* Dependencies +***************************************/ +#include "../common/error_private.h" +#include "zbuff.h" + +/*-**************************************** +* ZBUFF Error Management (deprecated) +******************************************/ + +/*! ZBUFF_isError() : +* tells if a return value is an error code */ +unsigned ZBUFF_isError(size_t errorCode) { return ERR_isError(errorCode); } +/*! ZBUFF_getErrorName() : +* provides error code string from function result (useful for debugging) */ +const char* ZBUFF_getErrorName(size_t errorCode) { return ERR_getErrorName(errorCode); } diff --git a/external/zstd/lib/deprecated/zbuff_compress.c b/external/zstd/lib/deprecated/zbuff_compress.c new file mode 100644 index 00000000..2e722673 --- /dev/null +++ b/external/zstd/lib/deprecated/zbuff_compress.c @@ -0,0 +1,147 @@ +/* + * Copyright (c) Yann Collet, Facebook, Inc. + * All rights reserved. + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. + */ + + + +/* ************************************* +* Dependencies +***************************************/ +#define ZBUFF_STATIC_LINKING_ONLY +#include "zbuff.h" + + +/*-*********************************************************** +* Streaming compression +* +* A ZBUFF_CCtx object is required to track streaming operation. +* Use ZBUFF_createCCtx() and ZBUFF_freeCCtx() to create/release resources. +* Use ZBUFF_compressInit() to start a new compression operation. +* ZBUFF_CCtx objects can be reused multiple times. +* +* Use ZBUFF_compressContinue() repetitively to consume your input. +* *srcSizePtr and *dstCapacityPtr can be any size. +* The function will report how many bytes were read or written by modifying *srcSizePtr and *dstCapacityPtr. +* Note that it may not consume the entire input, in which case it's up to the caller to call again the function with remaining input. +* The content of dst will be overwritten (up to *dstCapacityPtr) at each function call, so save its content if it matters or change dst . +* @return : a hint to preferred nb of bytes to use as input for next function call (it's only a hint, to improve latency) +* or an error code, which can be tested using ZBUFF_isError(). +* +* ZBUFF_compressFlush() can be used to instruct ZBUFF to compress and output whatever remains within its buffer. +* Note that it will not output more than *dstCapacityPtr. +* Therefore, some content might still be left into its internal buffer if dst buffer is too small. +* @return : nb of bytes still present into internal buffer (0 if it's empty) +* or an error code, which can be tested using ZBUFF_isError(). +* +* ZBUFF_compressEnd() instructs to finish a frame. +* It will perform a flush and write frame epilogue. +* Similar to ZBUFF_compressFlush(), it may not be able to output the entire internal buffer content if *dstCapacityPtr is too small. +* @return : nb of bytes still present into internal buffer (0 if it's empty) +* or an error code, which can be tested using ZBUFF_isError(). +* +* Hint : recommended buffer sizes (not compulsory) +* input : ZSTD_BLOCKSIZE_MAX (128 KB), internal unit size, it improves latency to use this value. +* output : ZSTD_compressBound(ZSTD_BLOCKSIZE_MAX) + ZSTD_blockHeaderSize + ZBUFF_endFrameSize : ensures it's always possible to write/flush/end a full block at best speed. +* ***********************************************************/ + +ZBUFF_CCtx* ZBUFF_createCCtx(void) +{ + return ZSTD_createCStream(); +} + +ZBUFF_CCtx* ZBUFF_createCCtx_advanced(ZSTD_customMem customMem) +{ + return ZSTD_createCStream_advanced(customMem); +} + +size_t ZBUFF_freeCCtx(ZBUFF_CCtx* zbc) +{ + return ZSTD_freeCStream(zbc); +} + + +/* ====== Initialization ====== */ + +size_t ZBUFF_compressInit_advanced(ZBUFF_CCtx* zbc, + const void* dict, size_t dictSize, + ZSTD_parameters params, unsigned long long pledgedSrcSize) +{ + if (pledgedSrcSize==0) pledgedSrcSize = ZSTD_CONTENTSIZE_UNKNOWN; /* preserve "0 == unknown" behavior */ + return ZSTD_initCStream_advanced(zbc, dict, dictSize, params, pledgedSrcSize); +} + + +size_t ZBUFF_compressInitDictionary(ZBUFF_CCtx* zbc, const void* dict, size_t dictSize, int compressionLevel) +{ + return ZSTD_initCStream_usingDict(zbc, dict, dictSize, compressionLevel); +} + +size_t ZBUFF_compressInit(ZBUFF_CCtx* zbc, int compressionLevel) +{ + return ZSTD_initCStream(zbc, compressionLevel); +} + +/* ====== Compression ====== */ + + +size_t ZBUFF_compressContinue(ZBUFF_CCtx* zbc, + void* dst, size_t* dstCapacityPtr, + const void* src, size_t* srcSizePtr) +{ + size_t result; + ZSTD_outBuffer outBuff; + ZSTD_inBuffer inBuff; + outBuff.dst = dst; + outBuff.pos = 0; + outBuff.size = *dstCapacityPtr; + inBuff.src = src; + inBuff.pos = 0; + inBuff.size = *srcSizePtr; + result = ZSTD_compressStream(zbc, &outBuff, &inBuff); + *dstCapacityPtr = outBuff.pos; + *srcSizePtr = inBuff.pos; + return result; +} + + + +/* ====== Finalize ====== */ + +size_t ZBUFF_compressFlush(ZBUFF_CCtx* zbc, void* dst, size_t* dstCapacityPtr) +{ + size_t result; + ZSTD_outBuffer outBuff; + outBuff.dst = dst; + outBuff.pos = 0; + outBuff.size = *dstCapacityPtr; + result = ZSTD_flushStream(zbc, &outBuff); + *dstCapacityPtr = outBuff.pos; + return result; +} + + +size_t ZBUFF_compressEnd(ZBUFF_CCtx* zbc, void* dst, size_t* dstCapacityPtr) +{ + size_t result; + ZSTD_outBuffer outBuff; + outBuff.dst = dst; + outBuff.pos = 0; + outBuff.size = *dstCapacityPtr; + result = ZSTD_endStream(zbc, &outBuff); + *dstCapacityPtr = outBuff.pos; + return result; +} + + + +/* ************************************* +* Tool functions +***************************************/ +size_t ZBUFF_recommendedCInSize(void) { return ZSTD_CStreamInSize(); } +size_t ZBUFF_recommendedCOutSize(void) { return ZSTD_CStreamOutSize(); } diff --git a/external/zstd/lib/deprecated/zbuff_decompress.c b/external/zstd/lib/deprecated/zbuff_decompress.c new file mode 100644 index 00000000..d73c0f35 --- /dev/null +++ b/external/zstd/lib/deprecated/zbuff_decompress.c @@ -0,0 +1,75 @@ +/* + * Copyright (c) Yann Collet, Facebook, Inc. + * All rights reserved. + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. + */ + + + +/* ************************************* +* Dependencies +***************************************/ +#define ZBUFF_STATIC_LINKING_ONLY +#include "zbuff.h" + + +ZBUFF_DCtx* ZBUFF_createDCtx(void) +{ + return ZSTD_createDStream(); +} + +ZBUFF_DCtx* ZBUFF_createDCtx_advanced(ZSTD_customMem customMem) +{ + return ZSTD_createDStream_advanced(customMem); +} + +size_t ZBUFF_freeDCtx(ZBUFF_DCtx* zbd) +{ + return ZSTD_freeDStream(zbd); +} + + +/* *** Initialization *** */ + +size_t ZBUFF_decompressInitDictionary(ZBUFF_DCtx* zbd, const void* dict, size_t dictSize) +{ + return ZSTD_initDStream_usingDict(zbd, dict, dictSize); +} + +size_t ZBUFF_decompressInit(ZBUFF_DCtx* zbd) +{ + return ZSTD_initDStream(zbd); +} + + +/* *** Decompression *** */ + +size_t ZBUFF_decompressContinue(ZBUFF_DCtx* zbd, + void* dst, size_t* dstCapacityPtr, + const void* src, size_t* srcSizePtr) +{ + ZSTD_outBuffer outBuff; + ZSTD_inBuffer inBuff; + size_t result; + outBuff.dst = dst; + outBuff.pos = 0; + outBuff.size = *dstCapacityPtr; + inBuff.src = src; + inBuff.pos = 0; + inBuff.size = *srcSizePtr; + result = ZSTD_decompressStream(zbd, &outBuff, &inBuff); + *dstCapacityPtr = outBuff.pos; + *srcSizePtr = inBuff.pos; + return result; +} + + +/* ************************************* +* Tool functions +***************************************/ +size_t ZBUFF_recommendedDInSize(void) { return ZSTD_DStreamInSize(); } +size_t ZBUFF_recommendedDOutSize(void) { return ZSTD_DStreamOutSize(); } diff --git a/external/zstd/lib/dictBuilder/cover.c b/external/zstd/lib/dictBuilder/cover.c new file mode 100644 index 00000000..8364444d --- /dev/null +++ b/external/zstd/lib/dictBuilder/cover.c @@ -0,0 +1,1246 @@ +/* + * Copyright (c) Yann Collet, Facebook, Inc. + * All rights reserved. + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. + */ + +/* ***************************************************************************** + * Constructs a dictionary using a heuristic based on the following paper: + * + * Liao, Petri, Moffat, Wirth + * Effective Construction of Relative Lempel-Ziv Dictionaries + * Published in WWW 2016. + * + * Adapted from code originally written by @ot (Giuseppe Ottaviano). + ******************************************************************************/ + +/*-************************************* +* Dependencies +***************************************/ +#include /* fprintf */ +#include /* malloc, free, qsort */ +#include /* memset */ +#include /* clock */ + +#ifndef ZDICT_STATIC_LINKING_ONLY +# define ZDICT_STATIC_LINKING_ONLY +#endif + +#include "../common/mem.h" /* read */ +#include "../common/pool.h" +#include "../common/threading.h" +#include "../common/zstd_internal.h" /* includes zstd.h */ +#include "../zdict.h" +#include "cover.h" + +/*-************************************* +* Constants +***************************************/ +#define COVER_MAX_SAMPLES_SIZE (sizeof(size_t) == 8 ? ((unsigned)-1) : ((unsigned)1 GB)) +#define COVER_DEFAULT_SPLITPOINT 1.0 + +/*-************************************* +* Console display +***************************************/ +#ifndef LOCALDISPLAYLEVEL +static int g_displayLevel = 2; +#endif +#undef DISPLAY +#define DISPLAY(...) \ + { \ + fprintf(stderr, __VA_ARGS__); \ + fflush(stderr); \ + } +#undef LOCALDISPLAYLEVEL +#define LOCALDISPLAYLEVEL(displayLevel, l, ...) \ + if (displayLevel >= l) { \ + DISPLAY(__VA_ARGS__); \ + } /* 0 : no display; 1: errors; 2: default; 3: details; 4: debug */ +#undef DISPLAYLEVEL +#define DISPLAYLEVEL(l, ...) LOCALDISPLAYLEVEL(g_displayLevel, l, __VA_ARGS__) + +#ifndef LOCALDISPLAYUPDATE +static const clock_t g_refreshRate = CLOCKS_PER_SEC * 15 / 100; +static clock_t g_time = 0; +#endif +#undef LOCALDISPLAYUPDATE +#define LOCALDISPLAYUPDATE(displayLevel, l, ...) \ + if (displayLevel >= l) { \ + if ((clock() - g_time > g_refreshRate) || (displayLevel >= 4)) { \ + g_time = clock(); \ + DISPLAY(__VA_ARGS__); \ + } \ + } +#undef DISPLAYUPDATE +#define DISPLAYUPDATE(l, ...) LOCALDISPLAYUPDATE(g_displayLevel, l, __VA_ARGS__) + +/*-************************************* +* Hash table +*************************************** +* A small specialized hash map for storing activeDmers. +* The map does not resize, so if it becomes full it will loop forever. +* Thus, the map must be large enough to store every value. +* The map implements linear probing and keeps its load less than 0.5. +*/ + +#define MAP_EMPTY_VALUE ((U32)-1) +typedef struct COVER_map_pair_t_s { + U32 key; + U32 value; +} COVER_map_pair_t; + +typedef struct COVER_map_s { + COVER_map_pair_t *data; + U32 sizeLog; + U32 size; + U32 sizeMask; +} COVER_map_t; + +/** + * Clear the map. + */ +static void COVER_map_clear(COVER_map_t *map) { + memset(map->data, MAP_EMPTY_VALUE, map->size * sizeof(COVER_map_pair_t)); +} + +/** + * Initializes a map of the given size. + * Returns 1 on success and 0 on failure. + * The map must be destroyed with COVER_map_destroy(). + * The map is only guaranteed to be large enough to hold size elements. + */ +static int COVER_map_init(COVER_map_t *map, U32 size) { + map->sizeLog = ZSTD_highbit32(size) + 2; + map->size = (U32)1 << map->sizeLog; + map->sizeMask = map->size - 1; + map->data = (COVER_map_pair_t *)malloc(map->size * sizeof(COVER_map_pair_t)); + if (!map->data) { + map->sizeLog = 0; + map->size = 0; + return 0; + } + COVER_map_clear(map); + return 1; +} + +/** + * Internal hash function + */ +static const U32 COVER_prime4bytes = 2654435761U; +static U32 COVER_map_hash(COVER_map_t *map, U32 key) { + return (key * COVER_prime4bytes) >> (32 - map->sizeLog); +} + +/** + * Helper function that returns the index that a key should be placed into. + */ +static U32 COVER_map_index(COVER_map_t *map, U32 key) { + const U32 hash = COVER_map_hash(map, key); + U32 i; + for (i = hash;; i = (i + 1) & map->sizeMask) { + COVER_map_pair_t *pos = &map->data[i]; + if (pos->value == MAP_EMPTY_VALUE) { + return i; + } + if (pos->key == key) { + return i; + } + } +} + +/** + * Returns the pointer to the value for key. + * If key is not in the map, it is inserted and the value is set to 0. + * The map must not be full. + */ +static U32 *COVER_map_at(COVER_map_t *map, U32 key) { + COVER_map_pair_t *pos = &map->data[COVER_map_index(map, key)]; + if (pos->value == MAP_EMPTY_VALUE) { + pos->key = key; + pos->value = 0; + } + return &pos->value; +} + +/** + * Deletes key from the map if present. + */ +static void COVER_map_remove(COVER_map_t *map, U32 key) { + U32 i = COVER_map_index(map, key); + COVER_map_pair_t *del = &map->data[i]; + U32 shift = 1; + if (del->value == MAP_EMPTY_VALUE) { + return; + } + for (i = (i + 1) & map->sizeMask;; i = (i + 1) & map->sizeMask) { + COVER_map_pair_t *const pos = &map->data[i]; + /* If the position is empty we are done */ + if (pos->value == MAP_EMPTY_VALUE) { + del->value = MAP_EMPTY_VALUE; + return; + } + /* If pos can be moved to del do so */ + if (((i - COVER_map_hash(map, pos->key)) & map->sizeMask) >= shift) { + del->key = pos->key; + del->value = pos->value; + del = pos; + shift = 1; + } else { + ++shift; + } + } +} + +/** + * Destroys a map that is inited with COVER_map_init(). + */ +static void COVER_map_destroy(COVER_map_t *map) { + if (map->data) { + free(map->data); + } + map->data = NULL; + map->size = 0; +} + +/*-************************************* +* Context +***************************************/ + +typedef struct { + const BYTE *samples; + size_t *offsets; + const size_t *samplesSizes; + size_t nbSamples; + size_t nbTrainSamples; + size_t nbTestSamples; + U32 *suffix; + size_t suffixSize; + U32 *freqs; + U32 *dmerAt; + unsigned d; +} COVER_ctx_t; + +/* We need a global context for qsort... */ +static COVER_ctx_t *g_coverCtx = NULL; + +/*-************************************* +* Helper functions +***************************************/ + +/** + * Returns the sum of the sample sizes. + */ +size_t COVER_sum(const size_t *samplesSizes, unsigned nbSamples) { + size_t sum = 0; + unsigned i; + for (i = 0; i < nbSamples; ++i) { + sum += samplesSizes[i]; + } + return sum; +} + +/** + * Returns -1 if the dmer at lp is less than the dmer at rp. + * Return 0 if the dmers at lp and rp are equal. + * Returns 1 if the dmer at lp is greater than the dmer at rp. + */ +static int COVER_cmp(COVER_ctx_t *ctx, const void *lp, const void *rp) { + U32 const lhs = *(U32 const *)lp; + U32 const rhs = *(U32 const *)rp; + return memcmp(ctx->samples + lhs, ctx->samples + rhs, ctx->d); +} +/** + * Faster version for d <= 8. + */ +static int COVER_cmp8(COVER_ctx_t *ctx, const void *lp, const void *rp) { + U64 const mask = (ctx->d == 8) ? (U64)-1 : (((U64)1 << (8 * ctx->d)) - 1); + U64 const lhs = MEM_readLE64(ctx->samples + *(U32 const *)lp) & mask; + U64 const rhs = MEM_readLE64(ctx->samples + *(U32 const *)rp) & mask; + if (lhs < rhs) { + return -1; + } + return (lhs > rhs); +} + +/** + * Same as COVER_cmp() except ties are broken by pointer value + * NOTE: g_coverCtx must be set to call this function. A global is required because + * qsort doesn't take an opaque pointer. + */ +static int WIN_CDECL COVER_strict_cmp(const void *lp, const void *rp) { + int result = COVER_cmp(g_coverCtx, lp, rp); + if (result == 0) { + result = lp < rp ? -1 : 1; + } + return result; +} +/** + * Faster version for d <= 8. + */ +static int WIN_CDECL COVER_strict_cmp8(const void *lp, const void *rp) { + int result = COVER_cmp8(g_coverCtx, lp, rp); + if (result == 0) { + result = lp < rp ? -1 : 1; + } + return result; +} + +/** + * Returns the first pointer in [first, last) whose element does not compare + * less than value. If no such element exists it returns last. + */ +static const size_t *COVER_lower_bound(const size_t *first, const size_t *last, + size_t value) { + size_t count = last - first; + while (count != 0) { + size_t step = count / 2; + const size_t *ptr = first; + ptr += step; + if (*ptr < value) { + first = ++ptr; + count -= step + 1; + } else { + count = step; + } + } + return first; +} + +/** + * Generic groupBy function. + * Groups an array sorted by cmp into groups with equivalent values. + * Calls grp for each group. + */ +static void +COVER_groupBy(const void *data, size_t count, size_t size, COVER_ctx_t *ctx, + int (*cmp)(COVER_ctx_t *, const void *, const void *), + void (*grp)(COVER_ctx_t *, const void *, const void *)) { + const BYTE *ptr = (const BYTE *)data; + size_t num = 0; + while (num < count) { + const BYTE *grpEnd = ptr + size; + ++num; + while (num < count && cmp(ctx, ptr, grpEnd) == 0) { + grpEnd += size; + ++num; + } + grp(ctx, ptr, grpEnd); + ptr = grpEnd; + } +} + +/*-************************************* +* Cover functions +***************************************/ + +/** + * Called on each group of positions with the same dmer. + * Counts the frequency of each dmer and saves it in the suffix array. + * Fills `ctx->dmerAt`. + */ +static void COVER_group(COVER_ctx_t *ctx, const void *group, + const void *groupEnd) { + /* The group consists of all the positions with the same first d bytes. */ + const U32 *grpPtr = (const U32 *)group; + const U32 *grpEnd = (const U32 *)groupEnd; + /* The dmerId is how we will reference this dmer. + * This allows us to map the whole dmer space to a much smaller space, the + * size of the suffix array. + */ + const U32 dmerId = (U32)(grpPtr - ctx->suffix); + /* Count the number of samples this dmer shows up in */ + U32 freq = 0; + /* Details */ + const size_t *curOffsetPtr = ctx->offsets; + const size_t *offsetsEnd = ctx->offsets + ctx->nbSamples; + /* Once *grpPtr >= curSampleEnd this occurrence of the dmer is in a + * different sample than the last. + */ + size_t curSampleEnd = ctx->offsets[0]; + for (; grpPtr != grpEnd; ++grpPtr) { + /* Save the dmerId for this position so we can get back to it. */ + ctx->dmerAt[*grpPtr] = dmerId; + /* Dictionaries only help for the first reference to the dmer. + * After that zstd can reference the match from the previous reference. + * So only count each dmer once for each sample it is in. + */ + if (*grpPtr < curSampleEnd) { + continue; + } + freq += 1; + /* Binary search to find the end of the sample *grpPtr is in. + * In the common case that grpPtr + 1 == grpEnd we can skip the binary + * search because the loop is over. + */ + if (grpPtr + 1 != grpEnd) { + const size_t *sampleEndPtr = + COVER_lower_bound(curOffsetPtr, offsetsEnd, *grpPtr); + curSampleEnd = *sampleEndPtr; + curOffsetPtr = sampleEndPtr + 1; + } + } + /* At this point we are never going to look at this segment of the suffix + * array again. We take advantage of this fact to save memory. + * We store the frequency of the dmer in the first position of the group, + * which is dmerId. + */ + ctx->suffix[dmerId] = freq; +} + + +/** + * Selects the best segment in an epoch. + * Segments of are scored according to the function: + * + * Let F(d) be the frequency of dmer d. + * Let S_i be the dmer at position i of segment S which has length k. + * + * Score(S) = F(S_1) + F(S_2) + ... + F(S_{k-d+1}) + * + * Once the dmer d is in the dictionary we set F(d) = 0. + */ +static COVER_segment_t COVER_selectSegment(const COVER_ctx_t *ctx, U32 *freqs, + COVER_map_t *activeDmers, U32 begin, + U32 end, + ZDICT_cover_params_t parameters) { + /* Constants */ + const U32 k = parameters.k; + const U32 d = parameters.d; + const U32 dmersInK = k - d + 1; + /* Try each segment (activeSegment) and save the best (bestSegment) */ + COVER_segment_t bestSegment = {0, 0, 0}; + COVER_segment_t activeSegment; + /* Reset the activeDmers in the segment */ + COVER_map_clear(activeDmers); + /* The activeSegment starts at the beginning of the epoch. */ + activeSegment.begin = begin; + activeSegment.end = begin; + activeSegment.score = 0; + /* Slide the activeSegment through the whole epoch. + * Save the best segment in bestSegment. + */ + while (activeSegment.end < end) { + /* The dmerId for the dmer at the next position */ + U32 newDmer = ctx->dmerAt[activeSegment.end]; + /* The entry in activeDmers for this dmerId */ + U32 *newDmerOcc = COVER_map_at(activeDmers, newDmer); + /* If the dmer isn't already present in the segment add its score. */ + if (*newDmerOcc == 0) { + /* The paper suggest using the L-0.5 norm, but experiments show that it + * doesn't help. + */ + activeSegment.score += freqs[newDmer]; + } + /* Add the dmer to the segment */ + activeSegment.end += 1; + *newDmerOcc += 1; + + /* If the window is now too large, drop the first position */ + if (activeSegment.end - activeSegment.begin == dmersInK + 1) { + U32 delDmer = ctx->dmerAt[activeSegment.begin]; + U32 *delDmerOcc = COVER_map_at(activeDmers, delDmer); + activeSegment.begin += 1; + *delDmerOcc -= 1; + /* If this is the last occurrence of the dmer, subtract its score */ + if (*delDmerOcc == 0) { + COVER_map_remove(activeDmers, delDmer); + activeSegment.score -= freqs[delDmer]; + } + } + + /* If this segment is the best so far save it */ + if (activeSegment.score > bestSegment.score) { + bestSegment = activeSegment; + } + } + { + /* Trim off the zero frequency head and tail from the segment. */ + U32 newBegin = bestSegment.end; + U32 newEnd = bestSegment.begin; + U32 pos; + for (pos = bestSegment.begin; pos != bestSegment.end; ++pos) { + U32 freq = freqs[ctx->dmerAt[pos]]; + if (freq != 0) { + newBegin = MIN(newBegin, pos); + newEnd = pos + 1; + } + } + bestSegment.begin = newBegin; + bestSegment.end = newEnd; + } + { + /* Zero out the frequency of each dmer covered by the chosen segment. */ + U32 pos; + for (pos = bestSegment.begin; pos != bestSegment.end; ++pos) { + freqs[ctx->dmerAt[pos]] = 0; + } + } + return bestSegment; +} + +/** + * Check the validity of the parameters. + * Returns non-zero if the parameters are valid and 0 otherwise. + */ +static int COVER_checkParameters(ZDICT_cover_params_t parameters, + size_t maxDictSize) { + /* k and d are required parameters */ + if (parameters.d == 0 || parameters.k == 0) { + return 0; + } + /* k <= maxDictSize */ + if (parameters.k > maxDictSize) { + return 0; + } + /* d <= k */ + if (parameters.d > parameters.k) { + return 0; + } + /* 0 < splitPoint <= 1 */ + if (parameters.splitPoint <= 0 || parameters.splitPoint > 1){ + return 0; + } + return 1; +} + +/** + * Clean up a context initialized with `COVER_ctx_init()`. + */ +static void COVER_ctx_destroy(COVER_ctx_t *ctx) { + if (!ctx) { + return; + } + if (ctx->suffix) { + free(ctx->suffix); + ctx->suffix = NULL; + } + if (ctx->freqs) { + free(ctx->freqs); + ctx->freqs = NULL; + } + if (ctx->dmerAt) { + free(ctx->dmerAt); + ctx->dmerAt = NULL; + } + if (ctx->offsets) { + free(ctx->offsets); + ctx->offsets = NULL; + } +} + +/** + * Prepare a context for dictionary building. + * The context is only dependent on the parameter `d` and can used multiple + * times. + * Returns 0 on success or error code on error. + * The context must be destroyed with `COVER_ctx_destroy()`. + */ +static size_t COVER_ctx_init(COVER_ctx_t *ctx, const void *samplesBuffer, + const size_t *samplesSizes, unsigned nbSamples, + unsigned d, double splitPoint) { + const BYTE *const samples = (const BYTE *)samplesBuffer; + const size_t totalSamplesSize = COVER_sum(samplesSizes, nbSamples); + /* Split samples into testing and training sets */ + const unsigned nbTrainSamples = splitPoint < 1.0 ? (unsigned)((double)nbSamples * splitPoint) : nbSamples; + const unsigned nbTestSamples = splitPoint < 1.0 ? nbSamples - nbTrainSamples : nbSamples; + const size_t trainingSamplesSize = splitPoint < 1.0 ? COVER_sum(samplesSizes, nbTrainSamples) : totalSamplesSize; + const size_t testSamplesSize = splitPoint < 1.0 ? COVER_sum(samplesSizes + nbTrainSamples, nbTestSamples) : totalSamplesSize; + /* Checks */ + if (totalSamplesSize < MAX(d, sizeof(U64)) || + totalSamplesSize >= (size_t)COVER_MAX_SAMPLES_SIZE) { + DISPLAYLEVEL(1, "Total samples size is too large (%u MB), maximum size is %u MB\n", + (unsigned)(totalSamplesSize>>20), (COVER_MAX_SAMPLES_SIZE >> 20)); + return ERROR(srcSize_wrong); + } + /* Check if there are at least 5 training samples */ + if (nbTrainSamples < 5) { + DISPLAYLEVEL(1, "Total number of training samples is %u and is invalid.", nbTrainSamples); + return ERROR(srcSize_wrong); + } + /* Check if there's testing sample */ + if (nbTestSamples < 1) { + DISPLAYLEVEL(1, "Total number of testing samples is %u and is invalid.", nbTestSamples); + return ERROR(srcSize_wrong); + } + /* Zero the context */ + memset(ctx, 0, sizeof(*ctx)); + DISPLAYLEVEL(2, "Training on %u samples of total size %u\n", nbTrainSamples, + (unsigned)trainingSamplesSize); + DISPLAYLEVEL(2, "Testing on %u samples of total size %u\n", nbTestSamples, + (unsigned)testSamplesSize); + ctx->samples = samples; + ctx->samplesSizes = samplesSizes; + ctx->nbSamples = nbSamples; + ctx->nbTrainSamples = nbTrainSamples; + ctx->nbTestSamples = nbTestSamples; + /* Partial suffix array */ + ctx->suffixSize = trainingSamplesSize - MAX(d, sizeof(U64)) + 1; + ctx->suffix = (U32 *)malloc(ctx->suffixSize * sizeof(U32)); + /* Maps index to the dmerID */ + ctx->dmerAt = (U32 *)malloc(ctx->suffixSize * sizeof(U32)); + /* The offsets of each file */ + ctx->offsets = (size_t *)malloc((nbSamples + 1) * sizeof(size_t)); + if (!ctx->suffix || !ctx->dmerAt || !ctx->offsets) { + DISPLAYLEVEL(1, "Failed to allocate scratch buffers\n"); + COVER_ctx_destroy(ctx); + return ERROR(memory_allocation); + } + ctx->freqs = NULL; + ctx->d = d; + + /* Fill offsets from the samplesSizes */ + { + U32 i; + ctx->offsets[0] = 0; + for (i = 1; i <= nbSamples; ++i) { + ctx->offsets[i] = ctx->offsets[i - 1] + samplesSizes[i - 1]; + } + } + DISPLAYLEVEL(2, "Constructing partial suffix array\n"); + { + /* suffix is a partial suffix array. + * It only sorts suffixes by their first parameters.d bytes. + * The sort is stable, so each dmer group is sorted by position in input. + */ + U32 i; + for (i = 0; i < ctx->suffixSize; ++i) { + ctx->suffix[i] = i; + } + /* qsort doesn't take an opaque pointer, so pass as a global. + * On OpenBSD qsort() is not guaranteed to be stable, their mergesort() is. + */ + g_coverCtx = ctx; +#if defined(__OpenBSD__) + mergesort(ctx->suffix, ctx->suffixSize, sizeof(U32), + (ctx->d <= 8 ? &COVER_strict_cmp8 : &COVER_strict_cmp)); +#else + qsort(ctx->suffix, ctx->suffixSize, sizeof(U32), + (ctx->d <= 8 ? &COVER_strict_cmp8 : &COVER_strict_cmp)); +#endif + } + DISPLAYLEVEL(2, "Computing frequencies\n"); + /* For each dmer group (group of positions with the same first d bytes): + * 1. For each position we set dmerAt[position] = dmerID. The dmerID is + * (groupBeginPtr - suffix). This allows us to go from position to + * dmerID so we can look up values in freq. + * 2. We calculate how many samples the dmer occurs in and save it in + * freqs[dmerId]. + */ + COVER_groupBy(ctx->suffix, ctx->suffixSize, sizeof(U32), ctx, + (ctx->d <= 8 ? &COVER_cmp8 : &COVER_cmp), &COVER_group); + ctx->freqs = ctx->suffix; + ctx->suffix = NULL; + return 0; +} + +void COVER_warnOnSmallCorpus(size_t maxDictSize, size_t nbDmers, int displayLevel) +{ + const double ratio = (double)nbDmers / maxDictSize; + if (ratio >= 10) { + return; + } + LOCALDISPLAYLEVEL(displayLevel, 1, + "WARNING: The maximum dictionary size %u is too large " + "compared to the source size %u! " + "size(source)/size(dictionary) = %f, but it should be >= " + "10! This may lead to a subpar dictionary! We recommend " + "training on sources at least 10x, and preferably 100x " + "the size of the dictionary! \n", (U32)maxDictSize, + (U32)nbDmers, ratio); +} + +COVER_epoch_info_t COVER_computeEpochs(U32 maxDictSize, + U32 nbDmers, U32 k, U32 passes) +{ + const U32 minEpochSize = k * 10; + COVER_epoch_info_t epochs; + epochs.num = MAX(1, maxDictSize / k / passes); + epochs.size = nbDmers / epochs.num; + if (epochs.size >= minEpochSize) { + assert(epochs.size * epochs.num <= nbDmers); + return epochs; + } + epochs.size = MIN(minEpochSize, nbDmers); + epochs.num = nbDmers / epochs.size; + assert(epochs.size * epochs.num <= nbDmers); + return epochs; +} + +/** + * Given the prepared context build the dictionary. + */ +static size_t COVER_buildDictionary(const COVER_ctx_t *ctx, U32 *freqs, + COVER_map_t *activeDmers, void *dictBuffer, + size_t dictBufferCapacity, + ZDICT_cover_params_t parameters) { + BYTE *const dict = (BYTE *)dictBuffer; + size_t tail = dictBufferCapacity; + /* Divide the data into epochs. We will select one segment from each epoch. */ + const COVER_epoch_info_t epochs = COVER_computeEpochs( + (U32)dictBufferCapacity, (U32)ctx->suffixSize, parameters.k, 4); + const size_t maxZeroScoreRun = MAX(10, MIN(100, epochs.num >> 3)); + size_t zeroScoreRun = 0; + size_t epoch; + DISPLAYLEVEL(2, "Breaking content into %u epochs of size %u\n", + (U32)epochs.num, (U32)epochs.size); + /* Loop through the epochs until there are no more segments or the dictionary + * is full. + */ + for (epoch = 0; tail > 0; epoch = (epoch + 1) % epochs.num) { + const U32 epochBegin = (U32)(epoch * epochs.size); + const U32 epochEnd = epochBegin + epochs.size; + size_t segmentSize; + /* Select a segment */ + COVER_segment_t segment = COVER_selectSegment( + ctx, freqs, activeDmers, epochBegin, epochEnd, parameters); + /* If the segment covers no dmers, then we are out of content. + * There may be new content in other epochs, for continue for some time. + */ + if (segment.score == 0) { + if (++zeroScoreRun >= maxZeroScoreRun) { + break; + } + continue; + } + zeroScoreRun = 0; + /* Trim the segment if necessary and if it is too small then we are done */ + segmentSize = MIN(segment.end - segment.begin + parameters.d - 1, tail); + if (segmentSize < parameters.d) { + break; + } + /* We fill the dictionary from the back to allow the best segments to be + * referenced with the smallest offsets. + */ + tail -= segmentSize; + memcpy(dict + tail, ctx->samples + segment.begin, segmentSize); + DISPLAYUPDATE( + 2, "\r%u%% ", + (unsigned)(((dictBufferCapacity - tail) * 100) / dictBufferCapacity)); + } + DISPLAYLEVEL(2, "\r%79s\r", ""); + return tail; +} + +ZDICTLIB_API size_t ZDICT_trainFromBuffer_cover( + void *dictBuffer, size_t dictBufferCapacity, + const void *samplesBuffer, const size_t *samplesSizes, unsigned nbSamples, + ZDICT_cover_params_t parameters) +{ + BYTE* const dict = (BYTE*)dictBuffer; + COVER_ctx_t ctx; + COVER_map_t activeDmers; + parameters.splitPoint = 1.0; + /* Initialize global data */ + g_displayLevel = parameters.zParams.notificationLevel; + /* Checks */ + if (!COVER_checkParameters(parameters, dictBufferCapacity)) { + DISPLAYLEVEL(1, "Cover parameters incorrect\n"); + return ERROR(parameter_outOfBound); + } + if (nbSamples == 0) { + DISPLAYLEVEL(1, "Cover must have at least one input file\n"); + return ERROR(srcSize_wrong); + } + if (dictBufferCapacity < ZDICT_DICTSIZE_MIN) { + DISPLAYLEVEL(1, "dictBufferCapacity must be at least %u\n", + ZDICT_DICTSIZE_MIN); + return ERROR(dstSize_tooSmall); + } + /* Initialize context and activeDmers */ + { + size_t const initVal = COVER_ctx_init(&ctx, samplesBuffer, samplesSizes, nbSamples, + parameters.d, parameters.splitPoint); + if (ZSTD_isError(initVal)) { + return initVal; + } + } + COVER_warnOnSmallCorpus(dictBufferCapacity, ctx.suffixSize, g_displayLevel); + if (!COVER_map_init(&activeDmers, parameters.k - parameters.d + 1)) { + DISPLAYLEVEL(1, "Failed to allocate dmer map: out of memory\n"); + COVER_ctx_destroy(&ctx); + return ERROR(memory_allocation); + } + + DISPLAYLEVEL(2, "Building dictionary\n"); + { + const size_t tail = + COVER_buildDictionary(&ctx, ctx.freqs, &activeDmers, dictBuffer, + dictBufferCapacity, parameters); + const size_t dictionarySize = ZDICT_finalizeDictionary( + dict, dictBufferCapacity, dict + tail, dictBufferCapacity - tail, + samplesBuffer, samplesSizes, nbSamples, parameters.zParams); + if (!ZSTD_isError(dictionarySize)) { + DISPLAYLEVEL(2, "Constructed dictionary of size %u\n", + (unsigned)dictionarySize); + } + COVER_ctx_destroy(&ctx); + COVER_map_destroy(&activeDmers); + return dictionarySize; + } +} + + + +size_t COVER_checkTotalCompressedSize(const ZDICT_cover_params_t parameters, + const size_t *samplesSizes, const BYTE *samples, + size_t *offsets, + size_t nbTrainSamples, size_t nbSamples, + BYTE *const dict, size_t dictBufferCapacity) { + size_t totalCompressedSize = ERROR(GENERIC); + /* Pointers */ + ZSTD_CCtx *cctx; + ZSTD_CDict *cdict; + void *dst; + /* Local variables */ + size_t dstCapacity; + size_t i; + /* Allocate dst with enough space to compress the maximum sized sample */ + { + size_t maxSampleSize = 0; + i = parameters.splitPoint < 1.0 ? nbTrainSamples : 0; + for (; i < nbSamples; ++i) { + maxSampleSize = MAX(samplesSizes[i], maxSampleSize); + } + dstCapacity = ZSTD_compressBound(maxSampleSize); + dst = malloc(dstCapacity); + } + /* Create the cctx and cdict */ + cctx = ZSTD_createCCtx(); + cdict = ZSTD_createCDict(dict, dictBufferCapacity, + parameters.zParams.compressionLevel); + if (!dst || !cctx || !cdict) { + goto _compressCleanup; + } + /* Compress each sample and sum their sizes (or error) */ + totalCompressedSize = dictBufferCapacity; + i = parameters.splitPoint < 1.0 ? nbTrainSamples : 0; + for (; i < nbSamples; ++i) { + const size_t size = ZSTD_compress_usingCDict( + cctx, dst, dstCapacity, samples + offsets[i], + samplesSizes[i], cdict); + if (ZSTD_isError(size)) { + totalCompressedSize = size; + goto _compressCleanup; + } + totalCompressedSize += size; + } +_compressCleanup: + ZSTD_freeCCtx(cctx); + ZSTD_freeCDict(cdict); + if (dst) { + free(dst); + } + return totalCompressedSize; +} + + +/** + * Initialize the `COVER_best_t`. + */ +void COVER_best_init(COVER_best_t *best) { + if (best==NULL) return; /* compatible with init on NULL */ + (void)ZSTD_pthread_mutex_init(&best->mutex, NULL); + (void)ZSTD_pthread_cond_init(&best->cond, NULL); + best->liveJobs = 0; + best->dict = NULL; + best->dictSize = 0; + best->compressedSize = (size_t)-1; + memset(&best->parameters, 0, sizeof(best->parameters)); +} + +/** + * Wait until liveJobs == 0. + */ +void COVER_best_wait(COVER_best_t *best) { + if (!best) { + return; + } + ZSTD_pthread_mutex_lock(&best->mutex); + while (best->liveJobs != 0) { + ZSTD_pthread_cond_wait(&best->cond, &best->mutex); + } + ZSTD_pthread_mutex_unlock(&best->mutex); +} + +/** + * Call COVER_best_wait() and then destroy the COVER_best_t. + */ +void COVER_best_destroy(COVER_best_t *best) { + if (!best) { + return; + } + COVER_best_wait(best); + if (best->dict) { + free(best->dict); + } + ZSTD_pthread_mutex_destroy(&best->mutex); + ZSTD_pthread_cond_destroy(&best->cond); +} + +/** + * Called when a thread is about to be launched. + * Increments liveJobs. + */ +void COVER_best_start(COVER_best_t *best) { + if (!best) { + return; + } + ZSTD_pthread_mutex_lock(&best->mutex); + ++best->liveJobs; + ZSTD_pthread_mutex_unlock(&best->mutex); +} + +/** + * Called when a thread finishes executing, both on error or success. + * Decrements liveJobs and signals any waiting threads if liveJobs == 0. + * If this dictionary is the best so far save it and its parameters. + */ +void COVER_best_finish(COVER_best_t *best, ZDICT_cover_params_t parameters, + COVER_dictSelection_t selection) { + void* dict = selection.dictContent; + size_t compressedSize = selection.totalCompressedSize; + size_t dictSize = selection.dictSize; + if (!best) { + return; + } + { + size_t liveJobs; + ZSTD_pthread_mutex_lock(&best->mutex); + --best->liveJobs; + liveJobs = best->liveJobs; + /* If the new dictionary is better */ + if (compressedSize < best->compressedSize) { + /* Allocate space if necessary */ + if (!best->dict || best->dictSize < dictSize) { + if (best->dict) { + free(best->dict); + } + best->dict = malloc(dictSize); + if (!best->dict) { + best->compressedSize = ERROR(GENERIC); + best->dictSize = 0; + ZSTD_pthread_cond_signal(&best->cond); + ZSTD_pthread_mutex_unlock(&best->mutex); + return; + } + } + /* Save the dictionary, parameters, and size */ + if (dict) { + memcpy(best->dict, dict, dictSize); + best->dictSize = dictSize; + best->parameters = parameters; + best->compressedSize = compressedSize; + } + } + if (liveJobs == 0) { + ZSTD_pthread_cond_broadcast(&best->cond); + } + ZSTD_pthread_mutex_unlock(&best->mutex); + } +} + +COVER_dictSelection_t COVER_dictSelectionError(size_t error) { + COVER_dictSelection_t selection = { NULL, 0, error }; + return selection; +} + +unsigned COVER_dictSelectionIsError(COVER_dictSelection_t selection) { + return (ZSTD_isError(selection.totalCompressedSize) || !selection.dictContent); +} + +void COVER_dictSelectionFree(COVER_dictSelection_t selection){ + free(selection.dictContent); +} + +COVER_dictSelection_t COVER_selectDict(BYTE* customDictContent, size_t dictBufferCapacity, + size_t dictContentSize, const BYTE* samplesBuffer, const size_t* samplesSizes, unsigned nbFinalizeSamples, + size_t nbCheckSamples, size_t nbSamples, ZDICT_cover_params_t params, size_t* offsets, size_t totalCompressedSize) { + + size_t largestDict = 0; + size_t largestCompressed = 0; + BYTE* customDictContentEnd = customDictContent + dictContentSize; + + BYTE * largestDictbuffer = (BYTE *)malloc(dictBufferCapacity); + BYTE * candidateDictBuffer = (BYTE *)malloc(dictBufferCapacity); + double regressionTolerance = ((double)params.shrinkDictMaxRegression / 100.0) + 1.00; + + if (!largestDictbuffer || !candidateDictBuffer) { + free(largestDictbuffer); + free(candidateDictBuffer); + return COVER_dictSelectionError(dictContentSize); + } + + /* Initial dictionary size and compressed size */ + memcpy(largestDictbuffer, customDictContent, dictContentSize); + dictContentSize = ZDICT_finalizeDictionary( + largestDictbuffer, dictBufferCapacity, customDictContent, dictContentSize, + samplesBuffer, samplesSizes, nbFinalizeSamples, params.zParams); + + if (ZDICT_isError(dictContentSize)) { + free(largestDictbuffer); + free(candidateDictBuffer); + return COVER_dictSelectionError(dictContentSize); + } + + totalCompressedSize = COVER_checkTotalCompressedSize(params, samplesSizes, + samplesBuffer, offsets, + nbCheckSamples, nbSamples, + largestDictbuffer, dictContentSize); + + if (ZSTD_isError(totalCompressedSize)) { + free(largestDictbuffer); + free(candidateDictBuffer); + return COVER_dictSelectionError(totalCompressedSize); + } + + if (params.shrinkDict == 0) { + COVER_dictSelection_t selection = { largestDictbuffer, dictContentSize, totalCompressedSize }; + free(candidateDictBuffer); + return selection; + } + + largestDict = dictContentSize; + largestCompressed = totalCompressedSize; + dictContentSize = ZDICT_DICTSIZE_MIN; + + /* Largest dict is initially at least ZDICT_DICTSIZE_MIN */ + while (dictContentSize < largestDict) { + memcpy(candidateDictBuffer, largestDictbuffer, largestDict); + dictContentSize = ZDICT_finalizeDictionary( + candidateDictBuffer, dictBufferCapacity, customDictContentEnd - dictContentSize, dictContentSize, + samplesBuffer, samplesSizes, nbFinalizeSamples, params.zParams); + + if (ZDICT_isError(dictContentSize)) { + free(largestDictbuffer); + free(candidateDictBuffer); + return COVER_dictSelectionError(dictContentSize); + + } + + totalCompressedSize = COVER_checkTotalCompressedSize(params, samplesSizes, + samplesBuffer, offsets, + nbCheckSamples, nbSamples, + candidateDictBuffer, dictContentSize); + + if (ZSTD_isError(totalCompressedSize)) { + free(largestDictbuffer); + free(candidateDictBuffer); + return COVER_dictSelectionError(totalCompressedSize); + } + + if (totalCompressedSize <= largestCompressed * regressionTolerance) { + COVER_dictSelection_t selection = { candidateDictBuffer, dictContentSize, totalCompressedSize }; + free(largestDictbuffer); + return selection; + } + dictContentSize *= 2; + } + dictContentSize = largestDict; + totalCompressedSize = largestCompressed; + { + COVER_dictSelection_t selection = { largestDictbuffer, dictContentSize, totalCompressedSize }; + free(candidateDictBuffer); + return selection; + } +} + +/** + * Parameters for COVER_tryParameters(). + */ +typedef struct COVER_tryParameters_data_s { + const COVER_ctx_t *ctx; + COVER_best_t *best; + size_t dictBufferCapacity; + ZDICT_cover_params_t parameters; +} COVER_tryParameters_data_t; + +/** + * Tries a set of parameters and updates the COVER_best_t with the results. + * This function is thread safe if zstd is compiled with multithreaded support. + * It takes its parameters as an *OWNING* opaque pointer to support threading. + */ +static void COVER_tryParameters(void *opaque) +{ + /* Save parameters as local variables */ + COVER_tryParameters_data_t *const data = (COVER_tryParameters_data_t*)opaque; + const COVER_ctx_t *const ctx = data->ctx; + const ZDICT_cover_params_t parameters = data->parameters; + size_t dictBufferCapacity = data->dictBufferCapacity; + size_t totalCompressedSize = ERROR(GENERIC); + /* Allocate space for hash table, dict, and freqs */ + COVER_map_t activeDmers; + BYTE* const dict = (BYTE*)malloc(dictBufferCapacity); + COVER_dictSelection_t selection = COVER_dictSelectionError(ERROR(GENERIC)); + U32* const freqs = (U32*)malloc(ctx->suffixSize * sizeof(U32)); + if (!COVER_map_init(&activeDmers, parameters.k - parameters.d + 1)) { + DISPLAYLEVEL(1, "Failed to allocate dmer map: out of memory\n"); + goto _cleanup; + } + if (!dict || !freqs) { + DISPLAYLEVEL(1, "Failed to allocate buffers: out of memory\n"); + goto _cleanup; + } + /* Copy the frequencies because we need to modify them */ + memcpy(freqs, ctx->freqs, ctx->suffixSize * sizeof(U32)); + /* Build the dictionary */ + { + const size_t tail = COVER_buildDictionary(ctx, freqs, &activeDmers, dict, + dictBufferCapacity, parameters); + selection = COVER_selectDict(dict + tail, dictBufferCapacity, dictBufferCapacity - tail, + ctx->samples, ctx->samplesSizes, (unsigned)ctx->nbTrainSamples, ctx->nbTrainSamples, ctx->nbSamples, parameters, ctx->offsets, + totalCompressedSize); + + if (COVER_dictSelectionIsError(selection)) { + DISPLAYLEVEL(1, "Failed to select dictionary\n"); + goto _cleanup; + } + } +_cleanup: + free(dict); + COVER_best_finish(data->best, parameters, selection); + free(data); + COVER_map_destroy(&activeDmers); + COVER_dictSelectionFree(selection); + free(freqs); +} + +ZDICTLIB_API size_t ZDICT_optimizeTrainFromBuffer_cover( + void* dictBuffer, size_t dictBufferCapacity, const void* samplesBuffer, + const size_t* samplesSizes, unsigned nbSamples, + ZDICT_cover_params_t* parameters) +{ + /* constants */ + const unsigned nbThreads = parameters->nbThreads; + const double splitPoint = + parameters->splitPoint <= 0.0 ? COVER_DEFAULT_SPLITPOINT : parameters->splitPoint; + const unsigned kMinD = parameters->d == 0 ? 6 : parameters->d; + const unsigned kMaxD = parameters->d == 0 ? 8 : parameters->d; + const unsigned kMinK = parameters->k == 0 ? 50 : parameters->k; + const unsigned kMaxK = parameters->k == 0 ? 2000 : parameters->k; + const unsigned kSteps = parameters->steps == 0 ? 40 : parameters->steps; + const unsigned kStepSize = MAX((kMaxK - kMinK) / kSteps, 1); + const unsigned kIterations = + (1 + (kMaxD - kMinD) / 2) * (1 + (kMaxK - kMinK) / kStepSize); + const unsigned shrinkDict = 0; + /* Local variables */ + const int displayLevel = parameters->zParams.notificationLevel; + unsigned iteration = 1; + unsigned d; + unsigned k; + COVER_best_t best; + POOL_ctx *pool = NULL; + int warned = 0; + + /* Checks */ + if (splitPoint <= 0 || splitPoint > 1) { + LOCALDISPLAYLEVEL(displayLevel, 1, "Incorrect parameters\n"); + return ERROR(parameter_outOfBound); + } + if (kMinK < kMaxD || kMaxK < kMinK) { + LOCALDISPLAYLEVEL(displayLevel, 1, "Incorrect parameters\n"); + return ERROR(parameter_outOfBound); + } + if (nbSamples == 0) { + DISPLAYLEVEL(1, "Cover must have at least one input file\n"); + return ERROR(srcSize_wrong); + } + if (dictBufferCapacity < ZDICT_DICTSIZE_MIN) { + DISPLAYLEVEL(1, "dictBufferCapacity must be at least %u\n", + ZDICT_DICTSIZE_MIN); + return ERROR(dstSize_tooSmall); + } + if (nbThreads > 1) { + pool = POOL_create(nbThreads, 1); + if (!pool) { + return ERROR(memory_allocation); + } + } + /* Initialization */ + COVER_best_init(&best); + /* Turn down global display level to clean up display at level 2 and below */ + g_displayLevel = displayLevel == 0 ? 0 : displayLevel - 1; + /* Loop through d first because each new value needs a new context */ + LOCALDISPLAYLEVEL(displayLevel, 2, "Trying %u different sets of parameters\n", + kIterations); + for (d = kMinD; d <= kMaxD; d += 2) { + /* Initialize the context for this value of d */ + COVER_ctx_t ctx; + LOCALDISPLAYLEVEL(displayLevel, 3, "d=%u\n", d); + { + const size_t initVal = COVER_ctx_init(&ctx, samplesBuffer, samplesSizes, nbSamples, d, splitPoint); + if (ZSTD_isError(initVal)) { + LOCALDISPLAYLEVEL(displayLevel, 1, "Failed to initialize context\n"); + COVER_best_destroy(&best); + POOL_free(pool); + return initVal; + } + } + if (!warned) { + COVER_warnOnSmallCorpus(dictBufferCapacity, ctx.suffixSize, displayLevel); + warned = 1; + } + /* Loop through k reusing the same context */ + for (k = kMinK; k <= kMaxK; k += kStepSize) { + /* Prepare the arguments */ + COVER_tryParameters_data_t *data = (COVER_tryParameters_data_t *)malloc( + sizeof(COVER_tryParameters_data_t)); + LOCALDISPLAYLEVEL(displayLevel, 3, "k=%u\n", k); + if (!data) { + LOCALDISPLAYLEVEL(displayLevel, 1, "Failed to allocate parameters\n"); + COVER_best_destroy(&best); + COVER_ctx_destroy(&ctx); + POOL_free(pool); + return ERROR(memory_allocation); + } + data->ctx = &ctx; + data->best = &best; + data->dictBufferCapacity = dictBufferCapacity; + data->parameters = *parameters; + data->parameters.k = k; + data->parameters.d = d; + data->parameters.splitPoint = splitPoint; + data->parameters.steps = kSteps; + data->parameters.shrinkDict = shrinkDict; + data->parameters.zParams.notificationLevel = g_displayLevel; + /* Check the parameters */ + if (!COVER_checkParameters(data->parameters, dictBufferCapacity)) { + DISPLAYLEVEL(1, "Cover parameters incorrect\n"); + free(data); + continue; + } + /* Call the function and pass ownership of data to it */ + COVER_best_start(&best); + if (pool) { + POOL_add(pool, &COVER_tryParameters, data); + } else { + COVER_tryParameters(data); + } + /* Print status */ + LOCALDISPLAYUPDATE(displayLevel, 2, "\r%u%% ", + (unsigned)((iteration * 100) / kIterations)); + ++iteration; + } + COVER_best_wait(&best); + COVER_ctx_destroy(&ctx); + } + LOCALDISPLAYLEVEL(displayLevel, 2, "\r%79s\r", ""); + /* Fill the output buffer and parameters with output of the best parameters */ + { + const size_t dictSize = best.dictSize; + if (ZSTD_isError(best.compressedSize)) { + const size_t compressedSize = best.compressedSize; + COVER_best_destroy(&best); + POOL_free(pool); + return compressedSize; + } + *parameters = best.parameters; + memcpy(dictBuffer, best.dict, dictSize); + COVER_best_destroy(&best); + POOL_free(pool); + return dictSize; + } +} diff --git a/external/zstd/lib/dictBuilder/cover.h b/external/zstd/lib/dictBuilder/cover.h new file mode 100644 index 00000000..1aacdddd --- /dev/null +++ b/external/zstd/lib/dictBuilder/cover.h @@ -0,0 +1,158 @@ +/* + * Copyright (c) Facebook, Inc. + * All rights reserved. + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. + */ + +#ifndef ZDICT_STATIC_LINKING_ONLY +# define ZDICT_STATIC_LINKING_ONLY +#endif + +#include /* fprintf */ +#include /* malloc, free, qsort */ +#include /* memset */ +#include /* clock */ +#include "../common/mem.h" /* read */ +#include "../common/pool.h" +#include "../common/threading.h" +#include "../common/zstd_internal.h" /* includes zstd.h */ +#include "../zdict.h" + +/** + * COVER_best_t is used for two purposes: + * 1. Synchronizing threads. + * 2. Saving the best parameters and dictionary. + * + * All of the methods except COVER_best_init() are thread safe if zstd is + * compiled with multithreaded support. + */ +typedef struct COVER_best_s { + ZSTD_pthread_mutex_t mutex; + ZSTD_pthread_cond_t cond; + size_t liveJobs; + void *dict; + size_t dictSize; + ZDICT_cover_params_t parameters; + size_t compressedSize; +} COVER_best_t; + +/** + * A segment is a range in the source as well as the score of the segment. + */ +typedef struct { + U32 begin; + U32 end; + U32 score; +} COVER_segment_t; + +/** + *Number of epochs and size of each epoch. + */ +typedef struct { + U32 num; + U32 size; +} COVER_epoch_info_t; + +/** + * Struct used for the dictionary selection function. + */ +typedef struct COVER_dictSelection { + BYTE* dictContent; + size_t dictSize; + size_t totalCompressedSize; +} COVER_dictSelection_t; + +/** + * Computes the number of epochs and the size of each epoch. + * We will make sure that each epoch gets at least 10 * k bytes. + * + * The COVER algorithms divide the data up into epochs of equal size and + * select one segment from each epoch. + * + * @param maxDictSize The maximum allowed dictionary size. + * @param nbDmers The number of dmers we are training on. + * @param k The parameter k (segment size). + * @param passes The target number of passes over the dmer corpus. + * More passes means a better dictionary. + */ +COVER_epoch_info_t COVER_computeEpochs(U32 maxDictSize, U32 nbDmers, + U32 k, U32 passes); + +/** + * Warns the user when their corpus is too small. + */ +void COVER_warnOnSmallCorpus(size_t maxDictSize, size_t nbDmers, int displayLevel); + +/** + * Checks total compressed size of a dictionary + */ +size_t COVER_checkTotalCompressedSize(const ZDICT_cover_params_t parameters, + const size_t *samplesSizes, const BYTE *samples, + size_t *offsets, + size_t nbTrainSamples, size_t nbSamples, + BYTE *const dict, size_t dictBufferCapacity); + +/** + * Returns the sum of the sample sizes. + */ +size_t COVER_sum(const size_t *samplesSizes, unsigned nbSamples) ; + +/** + * Initialize the `COVER_best_t`. + */ +void COVER_best_init(COVER_best_t *best); + +/** + * Wait until liveJobs == 0. + */ +void COVER_best_wait(COVER_best_t *best); + +/** + * Call COVER_best_wait() and then destroy the COVER_best_t. + */ +void COVER_best_destroy(COVER_best_t *best); + +/** + * Called when a thread is about to be launched. + * Increments liveJobs. + */ +void COVER_best_start(COVER_best_t *best); + +/** + * Called when a thread finishes executing, both on error or success. + * Decrements liveJobs and signals any waiting threads if liveJobs == 0. + * If this dictionary is the best so far save it and its parameters. + */ +void COVER_best_finish(COVER_best_t *best, ZDICT_cover_params_t parameters, + COVER_dictSelection_t selection); +/** + * Error function for COVER_selectDict function. Checks if the return + * value is an error. + */ +unsigned COVER_dictSelectionIsError(COVER_dictSelection_t selection); + + /** + * Error function for COVER_selectDict function. Returns a struct where + * return.totalCompressedSize is a ZSTD error. + */ +COVER_dictSelection_t COVER_dictSelectionError(size_t error); + +/** + * Always call after selectDict is called to free up used memory from + * newly created dictionary. + */ +void COVER_dictSelectionFree(COVER_dictSelection_t selection); + +/** + * Called to finalize the dictionary and select one based on whether or not + * the shrink-dict flag was enabled. If enabled the dictionary used is the + * smallest dictionary within a specified regression of the compressed size + * from the largest dictionary. + */ + COVER_dictSelection_t COVER_selectDict(BYTE* customDictContent, size_t dictBufferCapacity, + size_t dictContentSize, const BYTE* samplesBuffer, const size_t* samplesSizes, unsigned nbFinalizeSamples, + size_t nbCheckSamples, size_t nbSamples, ZDICT_cover_params_t params, size_t* offsets, size_t totalCompressedSize); diff --git a/external/zstd/lib/dictBuilder/divsufsort.c b/external/zstd/lib/dictBuilder/divsufsort.c new file mode 100644 index 00000000..a2870fb3 --- /dev/null +++ b/external/zstd/lib/dictBuilder/divsufsort.c @@ -0,0 +1,1913 @@ +/* + * divsufsort.c for libdivsufsort-lite + * Copyright (c) 2003-2008 Yuta Mori All Rights Reserved. + * + * Permission is hereby granted, free of charge, to any person + * obtaining a copy of this software and associated documentation + * files (the "Software"), to deal in the Software without + * restriction, including without limitation the rights to use, + * copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following + * conditions: + * + * The above copyright notice and this permission notice shall be + * included in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES + * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT + * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, + * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR + * OTHER DEALINGS IN THE SOFTWARE. + */ + +/*- Compiler specifics -*/ +#ifdef __clang__ +#pragma clang diagnostic ignored "-Wshorten-64-to-32" +#endif + +#if defined(_MSC_VER) +# pragma warning(disable : 4244) +# pragma warning(disable : 4127) /* C4127 : Condition expression is constant */ +#endif + + +/*- Dependencies -*/ +#include +#include +#include + +#include "divsufsort.h" + +/*- Constants -*/ +#if defined(INLINE) +# undef INLINE +#endif +#if !defined(INLINE) +# define INLINE __inline +#endif +#if defined(ALPHABET_SIZE) && (ALPHABET_SIZE < 1) +# undef ALPHABET_SIZE +#endif +#if !defined(ALPHABET_SIZE) +# define ALPHABET_SIZE (256) +#endif +#define BUCKET_A_SIZE (ALPHABET_SIZE) +#define BUCKET_B_SIZE (ALPHABET_SIZE * ALPHABET_SIZE) +#if defined(SS_INSERTIONSORT_THRESHOLD) +# if SS_INSERTIONSORT_THRESHOLD < 1 +# undef SS_INSERTIONSORT_THRESHOLD +# define SS_INSERTIONSORT_THRESHOLD (1) +# endif +#else +# define SS_INSERTIONSORT_THRESHOLD (8) +#endif +#if defined(SS_BLOCKSIZE) +# if SS_BLOCKSIZE < 0 +# undef SS_BLOCKSIZE +# define SS_BLOCKSIZE (0) +# elif 32768 <= SS_BLOCKSIZE +# undef SS_BLOCKSIZE +# define SS_BLOCKSIZE (32767) +# endif +#else +# define SS_BLOCKSIZE (1024) +#endif +/* minstacksize = log(SS_BLOCKSIZE) / log(3) * 2 */ +#if SS_BLOCKSIZE == 0 +# define SS_MISORT_STACKSIZE (96) +#elif SS_BLOCKSIZE <= 4096 +# define SS_MISORT_STACKSIZE (16) +#else +# define SS_MISORT_STACKSIZE (24) +#endif +#define SS_SMERGE_STACKSIZE (32) +#define TR_INSERTIONSORT_THRESHOLD (8) +#define TR_STACKSIZE (64) + + +/*- Macros -*/ +#ifndef SWAP +# define SWAP(_a, _b) do { t = (_a); (_a) = (_b); (_b) = t; } while(0) +#endif /* SWAP */ +#ifndef MIN +# define MIN(_a, _b) (((_a) < (_b)) ? (_a) : (_b)) +#endif /* MIN */ +#ifndef MAX +# define MAX(_a, _b) (((_a) > (_b)) ? (_a) : (_b)) +#endif /* MAX */ +#define STACK_PUSH(_a, _b, _c, _d)\ + do {\ + assert(ssize < STACK_SIZE);\ + stack[ssize].a = (_a), stack[ssize].b = (_b),\ + stack[ssize].c = (_c), stack[ssize++].d = (_d);\ + } while(0) +#define STACK_PUSH5(_a, _b, _c, _d, _e)\ + do {\ + assert(ssize < STACK_SIZE);\ + stack[ssize].a = (_a), stack[ssize].b = (_b),\ + stack[ssize].c = (_c), stack[ssize].d = (_d), stack[ssize++].e = (_e);\ + } while(0) +#define STACK_POP(_a, _b, _c, _d)\ + do {\ + assert(0 <= ssize);\ + if(ssize == 0) { return; }\ + (_a) = stack[--ssize].a, (_b) = stack[ssize].b,\ + (_c) = stack[ssize].c, (_d) = stack[ssize].d;\ + } while(0) +#define STACK_POP5(_a, _b, _c, _d, _e)\ + do {\ + assert(0 <= ssize);\ + if(ssize == 0) { return; }\ + (_a) = stack[--ssize].a, (_b) = stack[ssize].b,\ + (_c) = stack[ssize].c, (_d) = stack[ssize].d, (_e) = stack[ssize].e;\ + } while(0) +#define BUCKET_A(_c0) bucket_A[(_c0)] +#if ALPHABET_SIZE == 256 +#define BUCKET_B(_c0, _c1) (bucket_B[((_c1) << 8) | (_c0)]) +#define BUCKET_BSTAR(_c0, _c1) (bucket_B[((_c0) << 8) | (_c1)]) +#else +#define BUCKET_B(_c0, _c1) (bucket_B[(_c1) * ALPHABET_SIZE + (_c0)]) +#define BUCKET_BSTAR(_c0, _c1) (bucket_B[(_c0) * ALPHABET_SIZE + (_c1)]) +#endif + + +/*- Private Functions -*/ + +static const int lg_table[256]= { + -1,0,1,1,2,2,2,2,3,3,3,3,3,3,3,3,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4, + 5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5, + 6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6, + 6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6, + 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, + 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, + 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, + 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7 +}; + +#if (SS_BLOCKSIZE == 0) || (SS_INSERTIONSORT_THRESHOLD < SS_BLOCKSIZE) + +static INLINE +int +ss_ilg(int n) { +#if SS_BLOCKSIZE == 0 + return (n & 0xffff0000) ? + ((n & 0xff000000) ? + 24 + lg_table[(n >> 24) & 0xff] : + 16 + lg_table[(n >> 16) & 0xff]) : + ((n & 0x0000ff00) ? + 8 + lg_table[(n >> 8) & 0xff] : + 0 + lg_table[(n >> 0) & 0xff]); +#elif SS_BLOCKSIZE < 256 + return lg_table[n]; +#else + return (n & 0xff00) ? + 8 + lg_table[(n >> 8) & 0xff] : + 0 + lg_table[(n >> 0) & 0xff]; +#endif +} + +#endif /* (SS_BLOCKSIZE == 0) || (SS_INSERTIONSORT_THRESHOLD < SS_BLOCKSIZE) */ + +#if SS_BLOCKSIZE != 0 + +static const int sqq_table[256] = { + 0, 16, 22, 27, 32, 35, 39, 42, 45, 48, 50, 53, 55, 57, 59, 61, + 64, 65, 67, 69, 71, 73, 75, 76, 78, 80, 81, 83, 84, 86, 87, 89, + 90, 91, 93, 94, 96, 97, 98, 99, 101, 102, 103, 104, 106, 107, 108, 109, +110, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, +128, 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, +143, 144, 144, 145, 146, 147, 148, 149, 150, 150, 151, 152, 153, 154, 155, 155, +156, 157, 158, 159, 160, 160, 161, 162, 163, 163, 164, 165, 166, 167, 167, 168, +169, 170, 170, 171, 172, 173, 173, 174, 175, 176, 176, 177, 178, 178, 179, 180, +181, 181, 182, 183, 183, 184, 185, 185, 186, 187, 187, 188, 189, 189, 190, 191, +192, 192, 193, 193, 194, 195, 195, 196, 197, 197, 198, 199, 199, 200, 201, 201, +202, 203, 203, 204, 204, 205, 206, 206, 207, 208, 208, 209, 209, 210, 211, 211, +212, 212, 213, 214, 214, 215, 215, 216, 217, 217, 218, 218, 219, 219, 220, 221, +221, 222, 222, 223, 224, 224, 225, 225, 226, 226, 227, 227, 228, 229, 229, 230, +230, 231, 231, 232, 232, 233, 234, 234, 235, 235, 236, 236, 237, 237, 238, 238, +239, 240, 240, 241, 241, 242, 242, 243, 243, 244, 244, 245, 245, 246, 246, 247, +247, 248, 248, 249, 249, 250, 250, 251, 251, 252, 252, 253, 253, 254, 254, 255 +}; + +static INLINE +int +ss_isqrt(int x) { + int y, e; + + if(x >= (SS_BLOCKSIZE * SS_BLOCKSIZE)) { return SS_BLOCKSIZE; } + e = (x & 0xffff0000) ? + ((x & 0xff000000) ? + 24 + lg_table[(x >> 24) & 0xff] : + 16 + lg_table[(x >> 16) & 0xff]) : + ((x & 0x0000ff00) ? + 8 + lg_table[(x >> 8) & 0xff] : + 0 + lg_table[(x >> 0) & 0xff]); + + if(e >= 16) { + y = sqq_table[x >> ((e - 6) - (e & 1))] << ((e >> 1) - 7); + if(e >= 24) { y = (y + 1 + x / y) >> 1; } + y = (y + 1 + x / y) >> 1; + } else if(e >= 8) { + y = (sqq_table[x >> ((e - 6) - (e & 1))] >> (7 - (e >> 1))) + 1; + } else { + return sqq_table[x] >> 4; + } + + return (x < (y * y)) ? y - 1 : y; +} + +#endif /* SS_BLOCKSIZE != 0 */ + + +/*---------------------------------------------------------------------------*/ + +/* Compares two suffixes. */ +static INLINE +int +ss_compare(const unsigned char *T, + const int *p1, const int *p2, + int depth) { + const unsigned char *U1, *U2, *U1n, *U2n; + + for(U1 = T + depth + *p1, + U2 = T + depth + *p2, + U1n = T + *(p1 + 1) + 2, + U2n = T + *(p2 + 1) + 2; + (U1 < U1n) && (U2 < U2n) && (*U1 == *U2); + ++U1, ++U2) { + } + + return U1 < U1n ? + (U2 < U2n ? *U1 - *U2 : 1) : + (U2 < U2n ? -1 : 0); +} + + +/*---------------------------------------------------------------------------*/ + +#if (SS_BLOCKSIZE != 1) && (SS_INSERTIONSORT_THRESHOLD != 1) + +/* Insertionsort for small size groups */ +static +void +ss_insertionsort(const unsigned char *T, const int *PA, + int *first, int *last, int depth) { + int *i, *j; + int t; + int r; + + for(i = last - 2; first <= i; --i) { + for(t = *i, j = i + 1; 0 < (r = ss_compare(T, PA + t, PA + *j, depth));) { + do { *(j - 1) = *j; } while((++j < last) && (*j < 0)); + if(last <= j) { break; } + } + if(r == 0) { *j = ~*j; } + *(j - 1) = t; + } +} + +#endif /* (SS_BLOCKSIZE != 1) && (SS_INSERTIONSORT_THRESHOLD != 1) */ + + +/*---------------------------------------------------------------------------*/ + +#if (SS_BLOCKSIZE == 0) || (SS_INSERTIONSORT_THRESHOLD < SS_BLOCKSIZE) + +static INLINE +void +ss_fixdown(const unsigned char *Td, const int *PA, + int *SA, int i, int size) { + int j, k; + int v; + int c, d, e; + + for(v = SA[i], c = Td[PA[v]]; (j = 2 * i + 1) < size; SA[i] = SA[k], i = k) { + d = Td[PA[SA[k = j++]]]; + if(d < (e = Td[PA[SA[j]]])) { k = j; d = e; } + if(d <= c) { break; } + } + SA[i] = v; +} + +/* Simple top-down heapsort. */ +static +void +ss_heapsort(const unsigned char *Td, const int *PA, int *SA, int size) { + int i, m; + int t; + + m = size; + if((size % 2) == 0) { + m--; + if(Td[PA[SA[m / 2]]] < Td[PA[SA[m]]]) { SWAP(SA[m], SA[m / 2]); } + } + + for(i = m / 2 - 1; 0 <= i; --i) { ss_fixdown(Td, PA, SA, i, m); } + if((size % 2) == 0) { SWAP(SA[0], SA[m]); ss_fixdown(Td, PA, SA, 0, m); } + for(i = m - 1; 0 < i; --i) { + t = SA[0], SA[0] = SA[i]; + ss_fixdown(Td, PA, SA, 0, i); + SA[i] = t; + } +} + + +/*---------------------------------------------------------------------------*/ + +/* Returns the median of three elements. */ +static INLINE +int * +ss_median3(const unsigned char *Td, const int *PA, + int *v1, int *v2, int *v3) { + int *t; + if(Td[PA[*v1]] > Td[PA[*v2]]) { SWAP(v1, v2); } + if(Td[PA[*v2]] > Td[PA[*v3]]) { + if(Td[PA[*v1]] > Td[PA[*v3]]) { return v1; } + else { return v3; } + } + return v2; +} + +/* Returns the median of five elements. */ +static INLINE +int * +ss_median5(const unsigned char *Td, const int *PA, + int *v1, int *v2, int *v3, int *v4, int *v5) { + int *t; + if(Td[PA[*v2]] > Td[PA[*v3]]) { SWAP(v2, v3); } + if(Td[PA[*v4]] > Td[PA[*v5]]) { SWAP(v4, v5); } + if(Td[PA[*v2]] > Td[PA[*v4]]) { SWAP(v2, v4); SWAP(v3, v5); } + if(Td[PA[*v1]] > Td[PA[*v3]]) { SWAP(v1, v3); } + if(Td[PA[*v1]] > Td[PA[*v4]]) { SWAP(v1, v4); SWAP(v3, v5); } + if(Td[PA[*v3]] > Td[PA[*v4]]) { return v4; } + return v3; +} + +/* Returns the pivot element. */ +static INLINE +int * +ss_pivot(const unsigned char *Td, const int *PA, int *first, int *last) { + int *middle; + int t; + + t = last - first; + middle = first + t / 2; + + if(t <= 512) { + if(t <= 32) { + return ss_median3(Td, PA, first, middle, last - 1); + } else { + t >>= 2; + return ss_median5(Td, PA, first, first + t, middle, last - 1 - t, last - 1); + } + } + t >>= 3; + first = ss_median3(Td, PA, first, first + t, first + (t << 1)); + middle = ss_median3(Td, PA, middle - t, middle, middle + t); + last = ss_median3(Td, PA, last - 1 - (t << 1), last - 1 - t, last - 1); + return ss_median3(Td, PA, first, middle, last); +} + + +/*---------------------------------------------------------------------------*/ + +/* Binary partition for substrings. */ +static INLINE +int * +ss_partition(const int *PA, + int *first, int *last, int depth) { + int *a, *b; + int t; + for(a = first - 1, b = last;;) { + for(; (++a < b) && ((PA[*a] + depth) >= (PA[*a + 1] + 1));) { *a = ~*a; } + for(; (a < --b) && ((PA[*b] + depth) < (PA[*b + 1] + 1));) { } + if(b <= a) { break; } + t = ~*b; + *b = *a; + *a = t; + } + if(first < a) { *first = ~*first; } + return a; +} + +/* Multikey introsort for medium size groups. */ +static +void +ss_mintrosort(const unsigned char *T, const int *PA, + int *first, int *last, + int depth) { +#define STACK_SIZE SS_MISORT_STACKSIZE + struct { int *a, *b, c; int d; } stack[STACK_SIZE]; + const unsigned char *Td; + int *a, *b, *c, *d, *e, *f; + int s, t; + int ssize; + int limit; + int v, x = 0; + + for(ssize = 0, limit = ss_ilg(last - first);;) { + + if((last - first) <= SS_INSERTIONSORT_THRESHOLD) { +#if 1 < SS_INSERTIONSORT_THRESHOLD + if(1 < (last - first)) { ss_insertionsort(T, PA, first, last, depth); } +#endif + STACK_POP(first, last, depth, limit); + continue; + } + + Td = T + depth; + if(limit-- == 0) { ss_heapsort(Td, PA, first, last - first); } + if(limit < 0) { + for(a = first + 1, v = Td[PA[*first]]; a < last; ++a) { + if((x = Td[PA[*a]]) != v) { + if(1 < (a - first)) { break; } + v = x; + first = a; + } + } + if(Td[PA[*first] - 1] < v) { + first = ss_partition(PA, first, a, depth); + } + if((a - first) <= (last - a)) { + if(1 < (a - first)) { + STACK_PUSH(a, last, depth, -1); + last = a, depth += 1, limit = ss_ilg(a - first); + } else { + first = a, limit = -1; + } + } else { + if(1 < (last - a)) { + STACK_PUSH(first, a, depth + 1, ss_ilg(a - first)); + first = a, limit = -1; + } else { + last = a, depth += 1, limit = ss_ilg(a - first); + } + } + continue; + } + + /* choose pivot */ + a = ss_pivot(Td, PA, first, last); + v = Td[PA[*a]]; + SWAP(*first, *a); + + /* partition */ + for(b = first; (++b < last) && ((x = Td[PA[*b]]) == v);) { } + if(((a = b) < last) && (x < v)) { + for(; (++b < last) && ((x = Td[PA[*b]]) <= v);) { + if(x == v) { SWAP(*b, *a); ++a; } + } + } + for(c = last; (b < --c) && ((x = Td[PA[*c]]) == v);) { } + if((b < (d = c)) && (x > v)) { + for(; (b < --c) && ((x = Td[PA[*c]]) >= v);) { + if(x == v) { SWAP(*c, *d); --d; } + } + } + for(; b < c;) { + SWAP(*b, *c); + for(; (++b < c) && ((x = Td[PA[*b]]) <= v);) { + if(x == v) { SWAP(*b, *a); ++a; } + } + for(; (b < --c) && ((x = Td[PA[*c]]) >= v);) { + if(x == v) { SWAP(*c, *d); --d; } + } + } + + if(a <= d) { + c = b - 1; + + if((s = a - first) > (t = b - a)) { s = t; } + for(e = first, f = b - s; 0 < s; --s, ++e, ++f) { SWAP(*e, *f); } + if((s = d - c) > (t = last - d - 1)) { s = t; } + for(e = b, f = last - s; 0 < s; --s, ++e, ++f) { SWAP(*e, *f); } + + a = first + (b - a), c = last - (d - c); + b = (v <= Td[PA[*a] - 1]) ? a : ss_partition(PA, a, c, depth); + + if((a - first) <= (last - c)) { + if((last - c) <= (c - b)) { + STACK_PUSH(b, c, depth + 1, ss_ilg(c - b)); + STACK_PUSH(c, last, depth, limit); + last = a; + } else if((a - first) <= (c - b)) { + STACK_PUSH(c, last, depth, limit); + STACK_PUSH(b, c, depth + 1, ss_ilg(c - b)); + last = a; + } else { + STACK_PUSH(c, last, depth, limit); + STACK_PUSH(first, a, depth, limit); + first = b, last = c, depth += 1, limit = ss_ilg(c - b); + } + } else { + if((a - first) <= (c - b)) { + STACK_PUSH(b, c, depth + 1, ss_ilg(c - b)); + STACK_PUSH(first, a, depth, limit); + first = c; + } else if((last - c) <= (c - b)) { + STACK_PUSH(first, a, depth, limit); + STACK_PUSH(b, c, depth + 1, ss_ilg(c - b)); + first = c; + } else { + STACK_PUSH(first, a, depth, limit); + STACK_PUSH(c, last, depth, limit); + first = b, last = c, depth += 1, limit = ss_ilg(c - b); + } + } + } else { + limit += 1; + if(Td[PA[*first] - 1] < v) { + first = ss_partition(PA, first, last, depth); + limit = ss_ilg(last - first); + } + depth += 1; + } + } +#undef STACK_SIZE +} + +#endif /* (SS_BLOCKSIZE == 0) || (SS_INSERTIONSORT_THRESHOLD < SS_BLOCKSIZE) */ + + +/*---------------------------------------------------------------------------*/ + +#if SS_BLOCKSIZE != 0 + +static INLINE +void +ss_blockswap(int *a, int *b, int n) { + int t; + for(; 0 < n; --n, ++a, ++b) { + t = *a, *a = *b, *b = t; + } +} + +static INLINE +void +ss_rotate(int *first, int *middle, int *last) { + int *a, *b, t; + int l, r; + l = middle - first, r = last - middle; + for(; (0 < l) && (0 < r);) { + if(l == r) { ss_blockswap(first, middle, l); break; } + if(l < r) { + a = last - 1, b = middle - 1; + t = *a; + do { + *a-- = *b, *b-- = *a; + if(b < first) { + *a = t; + last = a; + if((r -= l + 1) <= l) { break; } + a -= 1, b = middle - 1; + t = *a; + } + } while(1); + } else { + a = first, b = middle; + t = *a; + do { + *a++ = *b, *b++ = *a; + if(last <= b) { + *a = t; + first = a + 1; + if((l -= r + 1) <= r) { break; } + a += 1, b = middle; + t = *a; + } + } while(1); + } + } +} + + +/*---------------------------------------------------------------------------*/ + +static +void +ss_inplacemerge(const unsigned char *T, const int *PA, + int *first, int *middle, int *last, + int depth) { + const int *p; + int *a, *b; + int len, half; + int q, r; + int x; + + for(;;) { + if(*(last - 1) < 0) { x = 1; p = PA + ~*(last - 1); } + else { x = 0; p = PA + *(last - 1); } + for(a = first, len = middle - first, half = len >> 1, r = -1; + 0 < len; + len = half, half >>= 1) { + b = a + half; + q = ss_compare(T, PA + ((0 <= *b) ? *b : ~*b), p, depth); + if(q < 0) { + a = b + 1; + half -= (len & 1) ^ 1; + } else { + r = q; + } + } + if(a < middle) { + if(r == 0) { *a = ~*a; } + ss_rotate(a, middle, last); + last -= middle - a; + middle = a; + if(first == middle) { break; } + } + --last; + if(x != 0) { while(*--last < 0) { } } + if(middle == last) { break; } + } +} + + +/*---------------------------------------------------------------------------*/ + +/* Merge-forward with internal buffer. */ +static +void +ss_mergeforward(const unsigned char *T, const int *PA, + int *first, int *middle, int *last, + int *buf, int depth) { + int *a, *b, *c, *bufend; + int t; + int r; + + bufend = buf + (middle - first) - 1; + ss_blockswap(buf, first, middle - first); + + for(t = *(a = first), b = buf, c = middle;;) { + r = ss_compare(T, PA + *b, PA + *c, depth); + if(r < 0) { + do { + *a++ = *b; + if(bufend <= b) { *bufend = t; return; } + *b++ = *a; + } while(*b < 0); + } else if(r > 0) { + do { + *a++ = *c, *c++ = *a; + if(last <= c) { + while(b < bufend) { *a++ = *b, *b++ = *a; } + *a = *b, *b = t; + return; + } + } while(*c < 0); + } else { + *c = ~*c; + do { + *a++ = *b; + if(bufend <= b) { *bufend = t; return; } + *b++ = *a; + } while(*b < 0); + + do { + *a++ = *c, *c++ = *a; + if(last <= c) { + while(b < bufend) { *a++ = *b, *b++ = *a; } + *a = *b, *b = t; + return; + } + } while(*c < 0); + } + } +} + +/* Merge-backward with internal buffer. */ +static +void +ss_mergebackward(const unsigned char *T, const int *PA, + int *first, int *middle, int *last, + int *buf, int depth) { + const int *p1, *p2; + int *a, *b, *c, *bufend; + int t; + int r; + int x; + + bufend = buf + (last - middle) - 1; + ss_blockswap(buf, middle, last - middle); + + x = 0; + if(*bufend < 0) { p1 = PA + ~*bufend; x |= 1; } + else { p1 = PA + *bufend; } + if(*(middle - 1) < 0) { p2 = PA + ~*(middle - 1); x |= 2; } + else { p2 = PA + *(middle - 1); } + for(t = *(a = last - 1), b = bufend, c = middle - 1;;) { + r = ss_compare(T, p1, p2, depth); + if(0 < r) { + if(x & 1) { do { *a-- = *b, *b-- = *a; } while(*b < 0); x ^= 1; } + *a-- = *b; + if(b <= buf) { *buf = t; break; } + *b-- = *a; + if(*b < 0) { p1 = PA + ~*b; x |= 1; } + else { p1 = PA + *b; } + } else if(r < 0) { + if(x & 2) { do { *a-- = *c, *c-- = *a; } while(*c < 0); x ^= 2; } + *a-- = *c, *c-- = *a; + if(c < first) { + while(buf < b) { *a-- = *b, *b-- = *a; } + *a = *b, *b = t; + break; + } + if(*c < 0) { p2 = PA + ~*c; x |= 2; } + else { p2 = PA + *c; } + } else { + if(x & 1) { do { *a-- = *b, *b-- = *a; } while(*b < 0); x ^= 1; } + *a-- = ~*b; + if(b <= buf) { *buf = t; break; } + *b-- = *a; + if(x & 2) { do { *a-- = *c, *c-- = *a; } while(*c < 0); x ^= 2; } + *a-- = *c, *c-- = *a; + if(c < first) { + while(buf < b) { *a-- = *b, *b-- = *a; } + *a = *b, *b = t; + break; + } + if(*b < 0) { p1 = PA + ~*b; x |= 1; } + else { p1 = PA + *b; } + if(*c < 0) { p2 = PA + ~*c; x |= 2; } + else { p2 = PA + *c; } + } + } +} + +/* D&C based merge. */ +static +void +ss_swapmerge(const unsigned char *T, const int *PA, + int *first, int *middle, int *last, + int *buf, int bufsize, int depth) { +#define STACK_SIZE SS_SMERGE_STACKSIZE +#define GETIDX(a) ((0 <= (a)) ? (a) : (~(a))) +#define MERGE_CHECK(a, b, c)\ + do {\ + if(((c) & 1) ||\ + (((c) & 2) && (ss_compare(T, PA + GETIDX(*((a) - 1)), PA + *(a), depth) == 0))) {\ + *(a) = ~*(a);\ + }\ + if(((c) & 4) && ((ss_compare(T, PA + GETIDX(*((b) - 1)), PA + *(b), depth) == 0))) {\ + *(b) = ~*(b);\ + }\ + } while(0) + struct { int *a, *b, *c; int d; } stack[STACK_SIZE]; + int *l, *r, *lm, *rm; + int m, len, half; + int ssize; + int check, next; + + for(check = 0, ssize = 0;;) { + if((last - middle) <= bufsize) { + if((first < middle) && (middle < last)) { + ss_mergebackward(T, PA, first, middle, last, buf, depth); + } + MERGE_CHECK(first, last, check); + STACK_POP(first, middle, last, check); + continue; + } + + if((middle - first) <= bufsize) { + if(first < middle) { + ss_mergeforward(T, PA, first, middle, last, buf, depth); + } + MERGE_CHECK(first, last, check); + STACK_POP(first, middle, last, check); + continue; + } + + for(m = 0, len = MIN(middle - first, last - middle), half = len >> 1; + 0 < len; + len = half, half >>= 1) { + if(ss_compare(T, PA + GETIDX(*(middle + m + half)), + PA + GETIDX(*(middle - m - half - 1)), depth) < 0) { + m += half + 1; + half -= (len & 1) ^ 1; + } + } + + if(0 < m) { + lm = middle - m, rm = middle + m; + ss_blockswap(lm, middle, m); + l = r = middle, next = 0; + if(rm < last) { + if(*rm < 0) { + *rm = ~*rm; + if(first < lm) { for(; *--l < 0;) { } next |= 4; } + next |= 1; + } else if(first < lm) { + for(; *r < 0; ++r) { } + next |= 2; + } + } + + if((l - first) <= (last - r)) { + STACK_PUSH(r, rm, last, (next & 3) | (check & 4)); + middle = lm, last = l, check = (check & 3) | (next & 4); + } else { + if((next & 2) && (r == middle)) { next ^= 6; } + STACK_PUSH(first, lm, l, (check & 3) | (next & 4)); + first = r, middle = rm, check = (next & 3) | (check & 4); + } + } else { + if(ss_compare(T, PA + GETIDX(*(middle - 1)), PA + *middle, depth) == 0) { + *middle = ~*middle; + } + MERGE_CHECK(first, last, check); + STACK_POP(first, middle, last, check); + } + } +#undef STACK_SIZE +} + +#endif /* SS_BLOCKSIZE != 0 */ + + +/*---------------------------------------------------------------------------*/ + +/* Substring sort */ +static +void +sssort(const unsigned char *T, const int *PA, + int *first, int *last, + int *buf, int bufsize, + int depth, int n, int lastsuffix) { + int *a; +#if SS_BLOCKSIZE != 0 + int *b, *middle, *curbuf; + int j, k, curbufsize, limit; +#endif + int i; + + if(lastsuffix != 0) { ++first; } + +#if SS_BLOCKSIZE == 0 + ss_mintrosort(T, PA, first, last, depth); +#else + if((bufsize < SS_BLOCKSIZE) && + (bufsize < (last - first)) && + (bufsize < (limit = ss_isqrt(last - first)))) { + if(SS_BLOCKSIZE < limit) { limit = SS_BLOCKSIZE; } + buf = middle = last - limit, bufsize = limit; + } else { + middle = last, limit = 0; + } + for(a = first, i = 0; SS_BLOCKSIZE < (middle - a); a += SS_BLOCKSIZE, ++i) { +#if SS_INSERTIONSORT_THRESHOLD < SS_BLOCKSIZE + ss_mintrosort(T, PA, a, a + SS_BLOCKSIZE, depth); +#elif 1 < SS_BLOCKSIZE + ss_insertionsort(T, PA, a, a + SS_BLOCKSIZE, depth); +#endif + curbufsize = last - (a + SS_BLOCKSIZE); + curbuf = a + SS_BLOCKSIZE; + if(curbufsize <= bufsize) { curbufsize = bufsize, curbuf = buf; } + for(b = a, k = SS_BLOCKSIZE, j = i; j & 1; b -= k, k <<= 1, j >>= 1) { + ss_swapmerge(T, PA, b - k, b, b + k, curbuf, curbufsize, depth); + } + } +#if SS_INSERTIONSORT_THRESHOLD < SS_BLOCKSIZE + ss_mintrosort(T, PA, a, middle, depth); +#elif 1 < SS_BLOCKSIZE + ss_insertionsort(T, PA, a, middle, depth); +#endif + for(k = SS_BLOCKSIZE; i != 0; k <<= 1, i >>= 1) { + if(i & 1) { + ss_swapmerge(T, PA, a - k, a, middle, buf, bufsize, depth); + a -= k; + } + } + if(limit != 0) { +#if SS_INSERTIONSORT_THRESHOLD < SS_BLOCKSIZE + ss_mintrosort(T, PA, middle, last, depth); +#elif 1 < SS_BLOCKSIZE + ss_insertionsort(T, PA, middle, last, depth); +#endif + ss_inplacemerge(T, PA, first, middle, last, depth); + } +#endif + + if(lastsuffix != 0) { + /* Insert last type B* suffix. */ + int PAi[2]; PAi[0] = PA[*(first - 1)], PAi[1] = n - 2; + for(a = first, i = *(first - 1); + (a < last) && ((*a < 0) || (0 < ss_compare(T, &(PAi[0]), PA + *a, depth))); + ++a) { + *(a - 1) = *a; + } + *(a - 1) = i; + } +} + + +/*---------------------------------------------------------------------------*/ + +static INLINE +int +tr_ilg(int n) { + return (n & 0xffff0000) ? + ((n & 0xff000000) ? + 24 + lg_table[(n >> 24) & 0xff] : + 16 + lg_table[(n >> 16) & 0xff]) : + ((n & 0x0000ff00) ? + 8 + lg_table[(n >> 8) & 0xff] : + 0 + lg_table[(n >> 0) & 0xff]); +} + + +/*---------------------------------------------------------------------------*/ + +/* Simple insertionsort for small size groups. */ +static +void +tr_insertionsort(const int *ISAd, int *first, int *last) { + int *a, *b; + int t, r; + + for(a = first + 1; a < last; ++a) { + for(t = *a, b = a - 1; 0 > (r = ISAd[t] - ISAd[*b]);) { + do { *(b + 1) = *b; } while((first <= --b) && (*b < 0)); + if(b < first) { break; } + } + if(r == 0) { *b = ~*b; } + *(b + 1) = t; + } +} + + +/*---------------------------------------------------------------------------*/ + +static INLINE +void +tr_fixdown(const int *ISAd, int *SA, int i, int size) { + int j, k; + int v; + int c, d, e; + + for(v = SA[i], c = ISAd[v]; (j = 2 * i + 1) < size; SA[i] = SA[k], i = k) { + d = ISAd[SA[k = j++]]; + if(d < (e = ISAd[SA[j]])) { k = j; d = e; } + if(d <= c) { break; } + } + SA[i] = v; +} + +/* Simple top-down heapsort. */ +static +void +tr_heapsort(const int *ISAd, int *SA, int size) { + int i, m; + int t; + + m = size; + if((size % 2) == 0) { + m--; + if(ISAd[SA[m / 2]] < ISAd[SA[m]]) { SWAP(SA[m], SA[m / 2]); } + } + + for(i = m / 2 - 1; 0 <= i; --i) { tr_fixdown(ISAd, SA, i, m); } + if((size % 2) == 0) { SWAP(SA[0], SA[m]); tr_fixdown(ISAd, SA, 0, m); } + for(i = m - 1; 0 < i; --i) { + t = SA[0], SA[0] = SA[i]; + tr_fixdown(ISAd, SA, 0, i); + SA[i] = t; + } +} + + +/*---------------------------------------------------------------------------*/ + +/* Returns the median of three elements. */ +static INLINE +int * +tr_median3(const int *ISAd, int *v1, int *v2, int *v3) { + int *t; + if(ISAd[*v1] > ISAd[*v2]) { SWAP(v1, v2); } + if(ISAd[*v2] > ISAd[*v3]) { + if(ISAd[*v1] > ISAd[*v3]) { return v1; } + else { return v3; } + } + return v2; +} + +/* Returns the median of five elements. */ +static INLINE +int * +tr_median5(const int *ISAd, + int *v1, int *v2, int *v3, int *v4, int *v5) { + int *t; + if(ISAd[*v2] > ISAd[*v3]) { SWAP(v2, v3); } + if(ISAd[*v4] > ISAd[*v5]) { SWAP(v4, v5); } + if(ISAd[*v2] > ISAd[*v4]) { SWAP(v2, v4); SWAP(v3, v5); } + if(ISAd[*v1] > ISAd[*v3]) { SWAP(v1, v3); } + if(ISAd[*v1] > ISAd[*v4]) { SWAP(v1, v4); SWAP(v3, v5); } + if(ISAd[*v3] > ISAd[*v4]) { return v4; } + return v3; +} + +/* Returns the pivot element. */ +static INLINE +int * +tr_pivot(const int *ISAd, int *first, int *last) { + int *middle; + int t; + + t = last - first; + middle = first + t / 2; + + if(t <= 512) { + if(t <= 32) { + return tr_median3(ISAd, first, middle, last - 1); + } else { + t >>= 2; + return tr_median5(ISAd, first, first + t, middle, last - 1 - t, last - 1); + } + } + t >>= 3; + first = tr_median3(ISAd, first, first + t, first + (t << 1)); + middle = tr_median3(ISAd, middle - t, middle, middle + t); + last = tr_median3(ISAd, last - 1 - (t << 1), last - 1 - t, last - 1); + return tr_median3(ISAd, first, middle, last); +} + + +/*---------------------------------------------------------------------------*/ + +typedef struct _trbudget_t trbudget_t; +struct _trbudget_t { + int chance; + int remain; + int incval; + int count; +}; + +static INLINE +void +trbudget_init(trbudget_t *budget, int chance, int incval) { + budget->chance = chance; + budget->remain = budget->incval = incval; +} + +static INLINE +int +trbudget_check(trbudget_t *budget, int size) { + if(size <= budget->remain) { budget->remain -= size; return 1; } + if(budget->chance == 0) { budget->count += size; return 0; } + budget->remain += budget->incval - size; + budget->chance -= 1; + return 1; +} + + +/*---------------------------------------------------------------------------*/ + +static INLINE +void +tr_partition(const int *ISAd, + int *first, int *middle, int *last, + int **pa, int **pb, int v) { + int *a, *b, *c, *d, *e, *f; + int t, s; + int x = 0; + + for(b = middle - 1; (++b < last) && ((x = ISAd[*b]) == v);) { } + if(((a = b) < last) && (x < v)) { + for(; (++b < last) && ((x = ISAd[*b]) <= v);) { + if(x == v) { SWAP(*b, *a); ++a; } + } + } + for(c = last; (b < --c) && ((x = ISAd[*c]) == v);) { } + if((b < (d = c)) && (x > v)) { + for(; (b < --c) && ((x = ISAd[*c]) >= v);) { + if(x == v) { SWAP(*c, *d); --d; } + } + } + for(; b < c;) { + SWAP(*b, *c); + for(; (++b < c) && ((x = ISAd[*b]) <= v);) { + if(x == v) { SWAP(*b, *a); ++a; } + } + for(; (b < --c) && ((x = ISAd[*c]) >= v);) { + if(x == v) { SWAP(*c, *d); --d; } + } + } + + if(a <= d) { + c = b - 1; + if((s = a - first) > (t = b - a)) { s = t; } + for(e = first, f = b - s; 0 < s; --s, ++e, ++f) { SWAP(*e, *f); } + if((s = d - c) > (t = last - d - 1)) { s = t; } + for(e = b, f = last - s; 0 < s; --s, ++e, ++f) { SWAP(*e, *f); } + first += (b - a), last -= (d - c); + } + *pa = first, *pb = last; +} + +static +void +tr_copy(int *ISA, const int *SA, + int *first, int *a, int *b, int *last, + int depth) { + /* sort suffixes of middle partition + by using sorted order of suffixes of left and right partition. */ + int *c, *d, *e; + int s, v; + + v = b - SA - 1; + for(c = first, d = a - 1; c <= d; ++c) { + if((0 <= (s = *c - depth)) && (ISA[s] == v)) { + *++d = s; + ISA[s] = d - SA; + } + } + for(c = last - 1, e = d + 1, d = b; e < d; --c) { + if((0 <= (s = *c - depth)) && (ISA[s] == v)) { + *--d = s; + ISA[s] = d - SA; + } + } +} + +static +void +tr_partialcopy(int *ISA, const int *SA, + int *first, int *a, int *b, int *last, + int depth) { + int *c, *d, *e; + int s, v; + int rank, lastrank, newrank = -1; + + v = b - SA - 1; + lastrank = -1; + for(c = first, d = a - 1; c <= d; ++c) { + if((0 <= (s = *c - depth)) && (ISA[s] == v)) { + *++d = s; + rank = ISA[s + depth]; + if(lastrank != rank) { lastrank = rank; newrank = d - SA; } + ISA[s] = newrank; + } + } + + lastrank = -1; + for(e = d; first <= e; --e) { + rank = ISA[*e]; + if(lastrank != rank) { lastrank = rank; newrank = e - SA; } + if(newrank != rank) { ISA[*e] = newrank; } + } + + lastrank = -1; + for(c = last - 1, e = d + 1, d = b; e < d; --c) { + if((0 <= (s = *c - depth)) && (ISA[s] == v)) { + *--d = s; + rank = ISA[s + depth]; + if(lastrank != rank) { lastrank = rank; newrank = d - SA; } + ISA[s] = newrank; + } + } +} + +static +void +tr_introsort(int *ISA, const int *ISAd, + int *SA, int *first, int *last, + trbudget_t *budget) { +#define STACK_SIZE TR_STACKSIZE + struct { const int *a; int *b, *c; int d, e; }stack[STACK_SIZE]; + int *a, *b, *c; + int t; + int v, x = 0; + int incr = ISAd - ISA; + int limit, next; + int ssize, trlink = -1; + + for(ssize = 0, limit = tr_ilg(last - first);;) { + + if(limit < 0) { + if(limit == -1) { + /* tandem repeat partition */ + tr_partition(ISAd - incr, first, first, last, &a, &b, last - SA - 1); + + /* update ranks */ + if(a < last) { + for(c = first, v = a - SA - 1; c < a; ++c) { ISA[*c] = v; } + } + if(b < last) { + for(c = a, v = b - SA - 1; c < b; ++c) { ISA[*c] = v; } + } + + /* push */ + if(1 < (b - a)) { + STACK_PUSH5(NULL, a, b, 0, 0); + STACK_PUSH5(ISAd - incr, first, last, -2, trlink); + trlink = ssize - 2; + } + if((a - first) <= (last - b)) { + if(1 < (a - first)) { + STACK_PUSH5(ISAd, b, last, tr_ilg(last - b), trlink); + last = a, limit = tr_ilg(a - first); + } else if(1 < (last - b)) { + first = b, limit = tr_ilg(last - b); + } else { + STACK_POP5(ISAd, first, last, limit, trlink); + } + } else { + if(1 < (last - b)) { + STACK_PUSH5(ISAd, first, a, tr_ilg(a - first), trlink); + first = b, limit = tr_ilg(last - b); + } else if(1 < (a - first)) { + last = a, limit = tr_ilg(a - first); + } else { + STACK_POP5(ISAd, first, last, limit, trlink); + } + } + } else if(limit == -2) { + /* tandem repeat copy */ + a = stack[--ssize].b, b = stack[ssize].c; + if(stack[ssize].d == 0) { + tr_copy(ISA, SA, first, a, b, last, ISAd - ISA); + } else { + if(0 <= trlink) { stack[trlink].d = -1; } + tr_partialcopy(ISA, SA, first, a, b, last, ISAd - ISA); + } + STACK_POP5(ISAd, first, last, limit, trlink); + } else { + /* sorted partition */ + if(0 <= *first) { + a = first; + do { ISA[*a] = a - SA; } while((++a < last) && (0 <= *a)); + first = a; + } + if(first < last) { + a = first; do { *a = ~*a; } while(*++a < 0); + next = (ISA[*a] != ISAd[*a]) ? tr_ilg(a - first + 1) : -1; + if(++a < last) { for(b = first, v = a - SA - 1; b < a; ++b) { ISA[*b] = v; } } + + /* push */ + if(trbudget_check(budget, a - first)) { + if((a - first) <= (last - a)) { + STACK_PUSH5(ISAd, a, last, -3, trlink); + ISAd += incr, last = a, limit = next; + } else { + if(1 < (last - a)) { + STACK_PUSH5(ISAd + incr, first, a, next, trlink); + first = a, limit = -3; + } else { + ISAd += incr, last = a, limit = next; + } + } + } else { + if(0 <= trlink) { stack[trlink].d = -1; } + if(1 < (last - a)) { + first = a, limit = -3; + } else { + STACK_POP5(ISAd, first, last, limit, trlink); + } + } + } else { + STACK_POP5(ISAd, first, last, limit, trlink); + } + } + continue; + } + + if((last - first) <= TR_INSERTIONSORT_THRESHOLD) { + tr_insertionsort(ISAd, first, last); + limit = -3; + continue; + } + + if(limit-- == 0) { + tr_heapsort(ISAd, first, last - first); + for(a = last - 1; first < a; a = b) { + for(x = ISAd[*a], b = a - 1; (first <= b) && (ISAd[*b] == x); --b) { *b = ~*b; } + } + limit = -3; + continue; + } + + /* choose pivot */ + a = tr_pivot(ISAd, first, last); + SWAP(*first, *a); + v = ISAd[*first]; + + /* partition */ + tr_partition(ISAd, first, first + 1, last, &a, &b, v); + if((last - first) != (b - a)) { + next = (ISA[*a] != v) ? tr_ilg(b - a) : -1; + + /* update ranks */ + for(c = first, v = a - SA - 1; c < a; ++c) { ISA[*c] = v; } + if(b < last) { for(c = a, v = b - SA - 1; c < b; ++c) { ISA[*c] = v; } } + + /* push */ + if((1 < (b - a)) && (trbudget_check(budget, b - a))) { + if((a - first) <= (last - b)) { + if((last - b) <= (b - a)) { + if(1 < (a - first)) { + STACK_PUSH5(ISAd + incr, a, b, next, trlink); + STACK_PUSH5(ISAd, b, last, limit, trlink); + last = a; + } else if(1 < (last - b)) { + STACK_PUSH5(ISAd + incr, a, b, next, trlink); + first = b; + } else { + ISAd += incr, first = a, last = b, limit = next; + } + } else if((a - first) <= (b - a)) { + if(1 < (a - first)) { + STACK_PUSH5(ISAd, b, last, limit, trlink); + STACK_PUSH5(ISAd + incr, a, b, next, trlink); + last = a; + } else { + STACK_PUSH5(ISAd, b, last, limit, trlink); + ISAd += incr, first = a, last = b, limit = next; + } + } else { + STACK_PUSH5(ISAd, b, last, limit, trlink); + STACK_PUSH5(ISAd, first, a, limit, trlink); + ISAd += incr, first = a, last = b, limit = next; + } + } else { + if((a - first) <= (b - a)) { + if(1 < (last - b)) { + STACK_PUSH5(ISAd + incr, a, b, next, trlink); + STACK_PUSH5(ISAd, first, a, limit, trlink); + first = b; + } else if(1 < (a - first)) { + STACK_PUSH5(ISAd + incr, a, b, next, trlink); + last = a; + } else { + ISAd += incr, first = a, last = b, limit = next; + } + } else if((last - b) <= (b - a)) { + if(1 < (last - b)) { + STACK_PUSH5(ISAd, first, a, limit, trlink); + STACK_PUSH5(ISAd + incr, a, b, next, trlink); + first = b; + } else { + STACK_PUSH5(ISAd, first, a, limit, trlink); + ISAd += incr, first = a, last = b, limit = next; + } + } else { + STACK_PUSH5(ISAd, first, a, limit, trlink); + STACK_PUSH5(ISAd, b, last, limit, trlink); + ISAd += incr, first = a, last = b, limit = next; + } + } + } else { + if((1 < (b - a)) && (0 <= trlink)) { stack[trlink].d = -1; } + if((a - first) <= (last - b)) { + if(1 < (a - first)) { + STACK_PUSH5(ISAd, b, last, limit, trlink); + last = a; + } else if(1 < (last - b)) { + first = b; + } else { + STACK_POP5(ISAd, first, last, limit, trlink); + } + } else { + if(1 < (last - b)) { + STACK_PUSH5(ISAd, first, a, limit, trlink); + first = b; + } else if(1 < (a - first)) { + last = a; + } else { + STACK_POP5(ISAd, first, last, limit, trlink); + } + } + } + } else { + if(trbudget_check(budget, last - first)) { + limit = tr_ilg(last - first), ISAd += incr; + } else { + if(0 <= trlink) { stack[trlink].d = -1; } + STACK_POP5(ISAd, first, last, limit, trlink); + } + } + } +#undef STACK_SIZE +} + + + +/*---------------------------------------------------------------------------*/ + +/* Tandem repeat sort */ +static +void +trsort(int *ISA, int *SA, int n, int depth) { + int *ISAd; + int *first, *last; + trbudget_t budget; + int t, skip, unsorted; + + trbudget_init(&budget, tr_ilg(n) * 2 / 3, n); +/* trbudget_init(&budget, tr_ilg(n) * 3 / 4, n); */ + for(ISAd = ISA + depth; -n < *SA; ISAd += ISAd - ISA) { + first = SA; + skip = 0; + unsorted = 0; + do { + if((t = *first) < 0) { first -= t; skip += t; } + else { + if(skip != 0) { *(first + skip) = skip; skip = 0; } + last = SA + ISA[t] + 1; + if(1 < (last - first)) { + budget.count = 0; + tr_introsort(ISA, ISAd, SA, first, last, &budget); + if(budget.count != 0) { unsorted += budget.count; } + else { skip = first - last; } + } else if((last - first) == 1) { + skip = -1; + } + first = last; + } + } while(first < (SA + n)); + if(skip != 0) { *(first + skip) = skip; } + if(unsorted == 0) { break; } + } +} + + +/*---------------------------------------------------------------------------*/ + +/* Sorts suffixes of type B*. */ +static +int +sort_typeBstar(const unsigned char *T, int *SA, + int *bucket_A, int *bucket_B, + int n, int openMP) { + int *PAb, *ISAb, *buf; +#ifdef LIBBSC_OPENMP + int *curbuf; + int l; +#endif + int i, j, k, t, m, bufsize; + int c0, c1; +#ifdef LIBBSC_OPENMP + int d0, d1; +#endif + (void)openMP; + + /* Initialize bucket arrays. */ + for(i = 0; i < BUCKET_A_SIZE; ++i) { bucket_A[i] = 0; } + for(i = 0; i < BUCKET_B_SIZE; ++i) { bucket_B[i] = 0; } + + /* Count the number of occurrences of the first one or two characters of each + type A, B and B* suffix. Moreover, store the beginning position of all + type B* suffixes into the array SA. */ + for(i = n - 1, m = n, c0 = T[n - 1]; 0 <= i;) { + /* type A suffix. */ + do { ++BUCKET_A(c1 = c0); } while((0 <= --i) && ((c0 = T[i]) >= c1)); + if(0 <= i) { + /* type B* suffix. */ + ++BUCKET_BSTAR(c0, c1); + SA[--m] = i; + /* type B suffix. */ + for(--i, c1 = c0; (0 <= i) && ((c0 = T[i]) <= c1); --i, c1 = c0) { + ++BUCKET_B(c0, c1); + } + } + } + m = n - m; +/* +note: + A type B* suffix is lexicographically smaller than a type B suffix that + begins with the same first two characters. +*/ + + /* Calculate the index of start/end point of each bucket. */ + for(c0 = 0, i = 0, j = 0; c0 < ALPHABET_SIZE; ++c0) { + t = i + BUCKET_A(c0); + BUCKET_A(c0) = i + j; /* start point */ + i = t + BUCKET_B(c0, c0); + for(c1 = c0 + 1; c1 < ALPHABET_SIZE; ++c1) { + j += BUCKET_BSTAR(c0, c1); + BUCKET_BSTAR(c0, c1) = j; /* end point */ + i += BUCKET_B(c0, c1); + } + } + + if(0 < m) { + /* Sort the type B* suffixes by their first two characters. */ + PAb = SA + n - m; ISAb = SA + m; + for(i = m - 2; 0 <= i; --i) { + t = PAb[i], c0 = T[t], c1 = T[t + 1]; + SA[--BUCKET_BSTAR(c0, c1)] = i; + } + t = PAb[m - 1], c0 = T[t], c1 = T[t + 1]; + SA[--BUCKET_BSTAR(c0, c1)] = m - 1; + + /* Sort the type B* substrings using sssort. */ +#ifdef LIBBSC_OPENMP + if (openMP) + { + buf = SA + m; + c0 = ALPHABET_SIZE - 2, c1 = ALPHABET_SIZE - 1, j = m; +#pragma omp parallel default(shared) private(bufsize, curbuf, k, l, d0, d1) + { + bufsize = (n - (2 * m)) / omp_get_num_threads(); + curbuf = buf + omp_get_thread_num() * bufsize; + k = 0; + for(;;) { + #pragma omp critical(sssort_lock) + { + if(0 < (l = j)) { + d0 = c0, d1 = c1; + do { + k = BUCKET_BSTAR(d0, d1); + if(--d1 <= d0) { + d1 = ALPHABET_SIZE - 1; + if(--d0 < 0) { break; } + } + } while(((l - k) <= 1) && (0 < (l = k))); + c0 = d0, c1 = d1, j = k; + } + } + if(l == 0) { break; } + sssort(T, PAb, SA + k, SA + l, + curbuf, bufsize, 2, n, *(SA + k) == (m - 1)); + } + } + } + else + { + buf = SA + m, bufsize = n - (2 * m); + for(c0 = ALPHABET_SIZE - 2, j = m; 0 < j; --c0) { + for(c1 = ALPHABET_SIZE - 1; c0 < c1; j = i, --c1) { + i = BUCKET_BSTAR(c0, c1); + if(1 < (j - i)) { + sssort(T, PAb, SA + i, SA + j, + buf, bufsize, 2, n, *(SA + i) == (m - 1)); + } + } + } + } +#else + buf = SA + m, bufsize = n - (2 * m); + for(c0 = ALPHABET_SIZE - 2, j = m; 0 < j; --c0) { + for(c1 = ALPHABET_SIZE - 1; c0 < c1; j = i, --c1) { + i = BUCKET_BSTAR(c0, c1); + if(1 < (j - i)) { + sssort(T, PAb, SA + i, SA + j, + buf, bufsize, 2, n, *(SA + i) == (m - 1)); + } + } + } +#endif + + /* Compute ranks of type B* substrings. */ + for(i = m - 1; 0 <= i; --i) { + if(0 <= SA[i]) { + j = i; + do { ISAb[SA[i]] = i; } while((0 <= --i) && (0 <= SA[i])); + SA[i + 1] = i - j; + if(i <= 0) { break; } + } + j = i; + do { ISAb[SA[i] = ~SA[i]] = j; } while(SA[--i] < 0); + ISAb[SA[i]] = j; + } + + /* Construct the inverse suffix array of type B* suffixes using trsort. */ + trsort(ISAb, SA, m, 1); + + /* Set the sorted order of type B* suffixes. */ + for(i = n - 1, j = m, c0 = T[n - 1]; 0 <= i;) { + for(--i, c1 = c0; (0 <= i) && ((c0 = T[i]) >= c1); --i, c1 = c0) { } + if(0 <= i) { + t = i; + for(--i, c1 = c0; (0 <= i) && ((c0 = T[i]) <= c1); --i, c1 = c0) { } + SA[ISAb[--j]] = ((t == 0) || (1 < (t - i))) ? t : ~t; + } + } + + /* Calculate the index of start/end point of each bucket. */ + BUCKET_B(ALPHABET_SIZE - 1, ALPHABET_SIZE - 1) = n; /* end point */ + for(c0 = ALPHABET_SIZE - 2, k = m - 1; 0 <= c0; --c0) { + i = BUCKET_A(c0 + 1) - 1; + for(c1 = ALPHABET_SIZE - 1; c0 < c1; --c1) { + t = i - BUCKET_B(c0, c1); + BUCKET_B(c0, c1) = i; /* end point */ + + /* Move all type B* suffixes to the correct position. */ + for(i = t, j = BUCKET_BSTAR(c0, c1); + j <= k; + --i, --k) { SA[i] = SA[k]; } + } + BUCKET_BSTAR(c0, c0 + 1) = i - BUCKET_B(c0, c0) + 1; /* start point */ + BUCKET_B(c0, c0) = i; /* end point */ + } + } + + return m; +} + +/* Constructs the suffix array by using the sorted order of type B* suffixes. */ +static +void +construct_SA(const unsigned char *T, int *SA, + int *bucket_A, int *bucket_B, + int n, int m) { + int *i, *j, *k; + int s; + int c0, c1, c2; + + if(0 < m) { + /* Construct the sorted order of type B suffixes by using + the sorted order of type B* suffixes. */ + for(c1 = ALPHABET_SIZE - 2; 0 <= c1; --c1) { + /* Scan the suffix array from right to left. */ + for(i = SA + BUCKET_BSTAR(c1, c1 + 1), + j = SA + BUCKET_A(c1 + 1) - 1, k = NULL, c2 = -1; + i <= j; + --j) { + if(0 < (s = *j)) { + assert(T[s] == c1); + assert(((s + 1) < n) && (T[s] <= T[s + 1])); + assert(T[s - 1] <= T[s]); + *j = ~s; + c0 = T[--s]; + if((0 < s) && (T[s - 1] > c0)) { s = ~s; } + if(c0 != c2) { + if(0 <= c2) { BUCKET_B(c2, c1) = k - SA; } + k = SA + BUCKET_B(c2 = c0, c1); + } + assert(k < j); assert(k != NULL); + *k-- = s; + } else { + assert(((s == 0) && (T[s] == c1)) || (s < 0)); + *j = ~s; + } + } + } + } + + /* Construct the suffix array by using + the sorted order of type B suffixes. */ + k = SA + BUCKET_A(c2 = T[n - 1]); + *k++ = (T[n - 2] < c2) ? ~(n - 1) : (n - 1); + /* Scan the suffix array from left to right. */ + for(i = SA, j = SA + n; i < j; ++i) { + if(0 < (s = *i)) { + assert(T[s - 1] >= T[s]); + c0 = T[--s]; + if((s == 0) || (T[s - 1] < c0)) { s = ~s; } + if(c0 != c2) { + BUCKET_A(c2) = k - SA; + k = SA + BUCKET_A(c2 = c0); + } + assert(i < k); + *k++ = s; + } else { + assert(s < 0); + *i = ~s; + } + } +} + +/* Constructs the burrows-wheeler transformed string directly + by using the sorted order of type B* suffixes. */ +static +int +construct_BWT(const unsigned char *T, int *SA, + int *bucket_A, int *bucket_B, + int n, int m) { + int *i, *j, *k, *orig; + int s; + int c0, c1, c2; + + if(0 < m) { + /* Construct the sorted order of type B suffixes by using + the sorted order of type B* suffixes. */ + for(c1 = ALPHABET_SIZE - 2; 0 <= c1; --c1) { + /* Scan the suffix array from right to left. */ + for(i = SA + BUCKET_BSTAR(c1, c1 + 1), + j = SA + BUCKET_A(c1 + 1) - 1, k = NULL, c2 = -1; + i <= j; + --j) { + if(0 < (s = *j)) { + assert(T[s] == c1); + assert(((s + 1) < n) && (T[s] <= T[s + 1])); + assert(T[s - 1] <= T[s]); + c0 = T[--s]; + *j = ~((int)c0); + if((0 < s) && (T[s - 1] > c0)) { s = ~s; } + if(c0 != c2) { + if(0 <= c2) { BUCKET_B(c2, c1) = k - SA; } + k = SA + BUCKET_B(c2 = c0, c1); + } + assert(k < j); assert(k != NULL); + *k-- = s; + } else if(s != 0) { + *j = ~s; +#ifndef NDEBUG + } else { + assert(T[s] == c1); +#endif + } + } + } + } + + /* Construct the BWTed string by using + the sorted order of type B suffixes. */ + k = SA + BUCKET_A(c2 = T[n - 1]); + *k++ = (T[n - 2] < c2) ? ~((int)T[n - 2]) : (n - 1); + /* Scan the suffix array from left to right. */ + for(i = SA, j = SA + n, orig = SA; i < j; ++i) { + if(0 < (s = *i)) { + assert(T[s - 1] >= T[s]); + c0 = T[--s]; + *i = c0; + if((0 < s) && (T[s - 1] < c0)) { s = ~((int)T[s - 1]); } + if(c0 != c2) { + BUCKET_A(c2) = k - SA; + k = SA + BUCKET_A(c2 = c0); + } + assert(i < k); + *k++ = s; + } else if(s != 0) { + *i = ~s; + } else { + orig = i; + } + } + + return orig - SA; +} + +/* Constructs the burrows-wheeler transformed string directly + by using the sorted order of type B* suffixes. */ +static +int +construct_BWT_indexes(const unsigned char *T, int *SA, + int *bucket_A, int *bucket_B, + int n, int m, + unsigned char * num_indexes, int * indexes) { + int *i, *j, *k, *orig; + int s; + int c0, c1, c2; + + int mod = n / 8; + { + mod |= mod >> 1; mod |= mod >> 2; + mod |= mod >> 4; mod |= mod >> 8; + mod |= mod >> 16; mod >>= 1; + + *num_indexes = (unsigned char)((n - 1) / (mod + 1)); + } + + if(0 < m) { + /* Construct the sorted order of type B suffixes by using + the sorted order of type B* suffixes. */ + for(c1 = ALPHABET_SIZE - 2; 0 <= c1; --c1) { + /* Scan the suffix array from right to left. */ + for(i = SA + BUCKET_BSTAR(c1, c1 + 1), + j = SA + BUCKET_A(c1 + 1) - 1, k = NULL, c2 = -1; + i <= j; + --j) { + if(0 < (s = *j)) { + assert(T[s] == c1); + assert(((s + 1) < n) && (T[s] <= T[s + 1])); + assert(T[s - 1] <= T[s]); + + if ((s & mod) == 0) indexes[s / (mod + 1) - 1] = j - SA; + + c0 = T[--s]; + *j = ~((int)c0); + if((0 < s) && (T[s - 1] > c0)) { s = ~s; } + if(c0 != c2) { + if(0 <= c2) { BUCKET_B(c2, c1) = k - SA; } + k = SA + BUCKET_B(c2 = c0, c1); + } + assert(k < j); assert(k != NULL); + *k-- = s; + } else if(s != 0) { + *j = ~s; +#ifndef NDEBUG + } else { + assert(T[s] == c1); +#endif + } + } + } + } + + /* Construct the BWTed string by using + the sorted order of type B suffixes. */ + k = SA + BUCKET_A(c2 = T[n - 1]); + if (T[n - 2] < c2) { + if (((n - 1) & mod) == 0) indexes[(n - 1) / (mod + 1) - 1] = k - SA; + *k++ = ~((int)T[n - 2]); + } + else { + *k++ = n - 1; + } + + /* Scan the suffix array from left to right. */ + for(i = SA, j = SA + n, orig = SA; i < j; ++i) { + if(0 < (s = *i)) { + assert(T[s - 1] >= T[s]); + + if ((s & mod) == 0) indexes[s / (mod + 1) - 1] = i - SA; + + c0 = T[--s]; + *i = c0; + if(c0 != c2) { + BUCKET_A(c2) = k - SA; + k = SA + BUCKET_A(c2 = c0); + } + assert(i < k); + if((0 < s) && (T[s - 1] < c0)) { + if ((s & mod) == 0) indexes[s / (mod + 1) - 1] = k - SA; + *k++ = ~((int)T[s - 1]); + } else + *k++ = s; + } else if(s != 0) { + *i = ~s; + } else { + orig = i; + } + } + + return orig - SA; +} + + +/*---------------------------------------------------------------------------*/ + +/*- Function -*/ + +int +divsufsort(const unsigned char *T, int *SA, int n, int openMP) { + int *bucket_A, *bucket_B; + int m; + int err = 0; + + /* Check arguments. */ + if((T == NULL) || (SA == NULL) || (n < 0)) { return -1; } + else if(n == 0) { return 0; } + else if(n == 1) { SA[0] = 0; return 0; } + else if(n == 2) { m = (T[0] < T[1]); SA[m ^ 1] = 0, SA[m] = 1; return 0; } + + bucket_A = (int *)malloc(BUCKET_A_SIZE * sizeof(int)); + bucket_B = (int *)malloc(BUCKET_B_SIZE * sizeof(int)); + + /* Suffixsort. */ + if((bucket_A != NULL) && (bucket_B != NULL)) { + m = sort_typeBstar(T, SA, bucket_A, bucket_B, n, openMP); + construct_SA(T, SA, bucket_A, bucket_B, n, m); + } else { + err = -2; + } + + free(bucket_B); + free(bucket_A); + + return err; +} + +int +divbwt(const unsigned char *T, unsigned char *U, int *A, int n, unsigned char * num_indexes, int * indexes, int openMP) { + int *B; + int *bucket_A, *bucket_B; + int m, pidx, i; + + /* Check arguments. */ + if((T == NULL) || (U == NULL) || (n < 0)) { return -1; } + else if(n <= 1) { if(n == 1) { U[0] = T[0]; } return n; } + + if((B = A) == NULL) { B = (int *)malloc((size_t)(n + 1) * sizeof(int)); } + bucket_A = (int *)malloc(BUCKET_A_SIZE * sizeof(int)); + bucket_B = (int *)malloc(BUCKET_B_SIZE * sizeof(int)); + + /* Burrows-Wheeler Transform. */ + if((B != NULL) && (bucket_A != NULL) && (bucket_B != NULL)) { + m = sort_typeBstar(T, B, bucket_A, bucket_B, n, openMP); + + if (num_indexes == NULL || indexes == NULL) { + pidx = construct_BWT(T, B, bucket_A, bucket_B, n, m); + } else { + pidx = construct_BWT_indexes(T, B, bucket_A, bucket_B, n, m, num_indexes, indexes); + } + + /* Copy to output string. */ + U[0] = T[n - 1]; + for(i = 0; i < pidx; ++i) { U[i + 1] = (unsigned char)B[i]; } + for(i += 1; i < n; ++i) { U[i] = (unsigned char)B[i]; } + pidx += 1; + } else { + pidx = -2; + } + + free(bucket_B); + free(bucket_A); + if(A == NULL) { free(B); } + + return pidx; +} diff --git a/external/zstd/lib/dictBuilder/divsufsort.h b/external/zstd/lib/dictBuilder/divsufsort.h new file mode 100644 index 00000000..5440994a --- /dev/null +++ b/external/zstd/lib/dictBuilder/divsufsort.h @@ -0,0 +1,67 @@ +/* + * divsufsort.h for libdivsufsort-lite + * Copyright (c) 2003-2008 Yuta Mori All Rights Reserved. + * + * Permission is hereby granted, free of charge, to any person + * obtaining a copy of this software and associated documentation + * files (the "Software"), to deal in the Software without + * restriction, including without limitation the rights to use, + * copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following + * conditions: + * + * The above copyright notice and this permission notice shall be + * included in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES + * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT + * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, + * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR + * OTHER DEALINGS IN THE SOFTWARE. + */ + +#ifndef _DIVSUFSORT_H +#define _DIVSUFSORT_H 1 + +#ifdef __cplusplus +extern "C" { +#endif /* __cplusplus */ + + +/*- Prototypes -*/ + +/** + * Constructs the suffix array of a given string. + * @param T [0..n-1] The input string. + * @param SA [0..n-1] The output array of suffixes. + * @param n The length of the given string. + * @param openMP enables OpenMP optimization. + * @return 0 if no error occurred, -1 or -2 otherwise. + */ +int +divsufsort(const unsigned char *T, int *SA, int n, int openMP); + +/** + * Constructs the burrows-wheeler transformed string of a given string. + * @param T [0..n-1] The input string. + * @param U [0..n-1] The output string. (can be T) + * @param A [0..n-1] The temporary array. (can be NULL) + * @param n The length of the given string. + * @param num_indexes The length of secondary indexes array. (can be NULL) + * @param indexes The secondary indexes array. (can be NULL) + * @param openMP enables OpenMP optimization. + * @return The primary index if no error occurred, -1 or -2 otherwise. + */ +int +divbwt(const unsigned char *T, unsigned char *U, int *A, int n, unsigned char * num_indexes, int * indexes, int openMP); + + +#ifdef __cplusplus +} /* extern "C" */ +#endif /* __cplusplus */ + +#endif /* _DIVSUFSORT_H */ diff --git a/external/zstd/lib/dictBuilder/fastcover.c b/external/zstd/lib/dictBuilder/fastcover.c new file mode 100644 index 00000000..ed789f92 --- /dev/null +++ b/external/zstd/lib/dictBuilder/fastcover.c @@ -0,0 +1,759 @@ +/* + * Copyright (c) Facebook, Inc. + * All rights reserved. + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. + */ + +/*-************************************* +* Dependencies +***************************************/ +#include /* fprintf */ +#include /* malloc, free, qsort */ +#include /* memset */ +#include /* clock */ + +#ifndef ZDICT_STATIC_LINKING_ONLY +# define ZDICT_STATIC_LINKING_ONLY +#endif + +#include "../common/mem.h" /* read */ +#include "../common/pool.h" +#include "../common/threading.h" +#include "../common/zstd_internal.h" /* includes zstd.h */ +#include "../compress/zstd_compress_internal.h" /* ZSTD_hash*() */ +#include "../zdict.h" +#include "cover.h" + + +/*-************************************* +* Constants +***************************************/ +#define FASTCOVER_MAX_SAMPLES_SIZE (sizeof(size_t) == 8 ? ((unsigned)-1) : ((unsigned)1 GB)) +#define FASTCOVER_MAX_F 31 +#define FASTCOVER_MAX_ACCEL 10 +#define FASTCOVER_DEFAULT_SPLITPOINT 0.75 +#define DEFAULT_F 20 +#define DEFAULT_ACCEL 1 + + +/*-************************************* +* Console display +***************************************/ +#ifndef LOCALDISPLAYLEVEL +static int g_displayLevel = 2; +#endif +#undef DISPLAY +#define DISPLAY(...) \ + { \ + fprintf(stderr, __VA_ARGS__); \ + fflush(stderr); \ + } +#undef LOCALDISPLAYLEVEL +#define LOCALDISPLAYLEVEL(displayLevel, l, ...) \ + if (displayLevel >= l) { \ + DISPLAY(__VA_ARGS__); \ + } /* 0 : no display; 1: errors; 2: default; 3: details; 4: debug */ +#undef DISPLAYLEVEL +#define DISPLAYLEVEL(l, ...) LOCALDISPLAYLEVEL(g_displayLevel, l, __VA_ARGS__) + +#ifndef LOCALDISPLAYUPDATE +static const clock_t g_refreshRate = CLOCKS_PER_SEC * 15 / 100; +static clock_t g_time = 0; +#endif +#undef LOCALDISPLAYUPDATE +#define LOCALDISPLAYUPDATE(displayLevel, l, ...) \ + if (displayLevel >= l) { \ + if ((clock() - g_time > g_refreshRate) || (displayLevel >= 4)) { \ + g_time = clock(); \ + DISPLAY(__VA_ARGS__); \ + } \ + } +#undef DISPLAYUPDATE +#define DISPLAYUPDATE(l, ...) LOCALDISPLAYUPDATE(g_displayLevel, l, __VA_ARGS__) + + +/*-************************************* +* Hash Functions +***************************************/ +/** + * Hash the d-byte value pointed to by p and mod 2^f into the frequency vector + */ +static size_t FASTCOVER_hashPtrToIndex(const void* p, U32 f, unsigned d) { + if (d == 6) { + return ZSTD_hash6Ptr(p, f); + } + return ZSTD_hash8Ptr(p, f); +} + + +/*-************************************* +* Acceleration +***************************************/ +typedef struct { + unsigned finalize; /* Percentage of training samples used for ZDICT_finalizeDictionary */ + unsigned skip; /* Number of dmer skipped between each dmer counted in computeFrequency */ +} FASTCOVER_accel_t; + + +static const FASTCOVER_accel_t FASTCOVER_defaultAccelParameters[FASTCOVER_MAX_ACCEL+1] = { + { 100, 0 }, /* accel = 0, should not happen because accel = 0 defaults to accel = 1 */ + { 100, 0 }, /* accel = 1 */ + { 50, 1 }, /* accel = 2 */ + { 34, 2 }, /* accel = 3 */ + { 25, 3 }, /* accel = 4 */ + { 20, 4 }, /* accel = 5 */ + { 17, 5 }, /* accel = 6 */ + { 14, 6 }, /* accel = 7 */ + { 13, 7 }, /* accel = 8 */ + { 11, 8 }, /* accel = 9 */ + { 10, 9 }, /* accel = 10 */ +}; + + +/*-************************************* +* Context +***************************************/ +typedef struct { + const BYTE *samples; + size_t *offsets; + const size_t *samplesSizes; + size_t nbSamples; + size_t nbTrainSamples; + size_t nbTestSamples; + size_t nbDmers; + U32 *freqs; + unsigned d; + unsigned f; + FASTCOVER_accel_t accelParams; +} FASTCOVER_ctx_t; + + +/*-************************************* +* Helper functions +***************************************/ +/** + * Selects the best segment in an epoch. + * Segments of are scored according to the function: + * + * Let F(d) be the frequency of all dmers with hash value d. + * Let S_i be hash value of the dmer at position i of segment S which has length k. + * + * Score(S) = F(S_1) + F(S_2) + ... + F(S_{k-d+1}) + * + * Once the dmer with hash value d is in the dictionary we set F(d) = 0. + */ +static COVER_segment_t FASTCOVER_selectSegment(const FASTCOVER_ctx_t *ctx, + U32 *freqs, U32 begin, U32 end, + ZDICT_cover_params_t parameters, + U16* segmentFreqs) { + /* Constants */ + const U32 k = parameters.k; + const U32 d = parameters.d; + const U32 f = ctx->f; + const U32 dmersInK = k - d + 1; + + /* Try each segment (activeSegment) and save the best (bestSegment) */ + COVER_segment_t bestSegment = {0, 0, 0}; + COVER_segment_t activeSegment; + + /* Reset the activeDmers in the segment */ + /* The activeSegment starts at the beginning of the epoch. */ + activeSegment.begin = begin; + activeSegment.end = begin; + activeSegment.score = 0; + + /* Slide the activeSegment through the whole epoch. + * Save the best segment in bestSegment. + */ + while (activeSegment.end < end) { + /* Get hash value of current dmer */ + const size_t idx = FASTCOVER_hashPtrToIndex(ctx->samples + activeSegment.end, f, d); + + /* Add frequency of this index to score if this is the first occurrence of index in active segment */ + if (segmentFreqs[idx] == 0) { + activeSegment.score += freqs[idx]; + } + /* Increment end of segment and segmentFreqs*/ + activeSegment.end += 1; + segmentFreqs[idx] += 1; + /* If the window is now too large, drop the first position */ + if (activeSegment.end - activeSegment.begin == dmersInK + 1) { + /* Get hash value of the dmer to be eliminated from active segment */ + const size_t delIndex = FASTCOVER_hashPtrToIndex(ctx->samples + activeSegment.begin, f, d); + segmentFreqs[delIndex] -= 1; + /* Subtract frequency of this index from score if this is the last occurrence of this index in active segment */ + if (segmentFreqs[delIndex] == 0) { + activeSegment.score -= freqs[delIndex]; + } + /* Increment start of segment */ + activeSegment.begin += 1; + } + + /* If this segment is the best so far save it */ + if (activeSegment.score > bestSegment.score) { + bestSegment = activeSegment; + } + } + + /* Zero out rest of segmentFreqs array */ + while (activeSegment.begin < end) { + const size_t delIndex = FASTCOVER_hashPtrToIndex(ctx->samples + activeSegment.begin, f, d); + segmentFreqs[delIndex] -= 1; + activeSegment.begin += 1; + } + + { + /* Zero the frequency of hash value of each dmer covered by the chosen segment. */ + U32 pos; + for (pos = bestSegment.begin; pos != bestSegment.end; ++pos) { + const size_t i = FASTCOVER_hashPtrToIndex(ctx->samples + pos, f, d); + freqs[i] = 0; + } + } + + return bestSegment; +} + + +static int FASTCOVER_checkParameters(ZDICT_cover_params_t parameters, + size_t maxDictSize, unsigned f, + unsigned accel) { + /* k, d, and f are required parameters */ + if (parameters.d == 0 || parameters.k == 0) { + return 0; + } + /* d has to be 6 or 8 */ + if (parameters.d != 6 && parameters.d != 8) { + return 0; + } + /* k <= maxDictSize */ + if (parameters.k > maxDictSize) { + return 0; + } + /* d <= k */ + if (parameters.d > parameters.k) { + return 0; + } + /* 0 < f <= FASTCOVER_MAX_F*/ + if (f > FASTCOVER_MAX_F || f == 0) { + return 0; + } + /* 0 < splitPoint <= 1 */ + if (parameters.splitPoint <= 0 || parameters.splitPoint > 1) { + return 0; + } + /* 0 < accel <= 10 */ + if (accel > 10 || accel == 0) { + return 0; + } + return 1; +} + + +/** + * Clean up a context initialized with `FASTCOVER_ctx_init()`. + */ +static void +FASTCOVER_ctx_destroy(FASTCOVER_ctx_t* ctx) +{ + if (!ctx) return; + + free(ctx->freqs); + ctx->freqs = NULL; + + free(ctx->offsets); + ctx->offsets = NULL; +} + + +/** + * Calculate for frequency of hash value of each dmer in ctx->samples + */ +static void +FASTCOVER_computeFrequency(U32* freqs, const FASTCOVER_ctx_t* ctx) +{ + const unsigned f = ctx->f; + const unsigned d = ctx->d; + const unsigned skip = ctx->accelParams.skip; + const unsigned readLength = MAX(d, 8); + size_t i; + assert(ctx->nbTrainSamples >= 5); + assert(ctx->nbTrainSamples <= ctx->nbSamples); + for (i = 0; i < ctx->nbTrainSamples; i++) { + size_t start = ctx->offsets[i]; /* start of current dmer */ + size_t const currSampleEnd = ctx->offsets[i+1]; + while (start + readLength <= currSampleEnd) { + const size_t dmerIndex = FASTCOVER_hashPtrToIndex(ctx->samples + start, f, d); + freqs[dmerIndex]++; + start = start + skip + 1; + } + } +} + + +/** + * Prepare a context for dictionary building. + * The context is only dependent on the parameter `d` and can used multiple + * times. + * Returns 0 on success or error code on error. + * The context must be destroyed with `FASTCOVER_ctx_destroy()`. + */ +static size_t +FASTCOVER_ctx_init(FASTCOVER_ctx_t* ctx, + const void* samplesBuffer, + const size_t* samplesSizes, unsigned nbSamples, + unsigned d, double splitPoint, unsigned f, + FASTCOVER_accel_t accelParams) +{ + const BYTE* const samples = (const BYTE*)samplesBuffer; + const size_t totalSamplesSize = COVER_sum(samplesSizes, nbSamples); + /* Split samples into testing and training sets */ + const unsigned nbTrainSamples = splitPoint < 1.0 ? (unsigned)((double)nbSamples * splitPoint) : nbSamples; + const unsigned nbTestSamples = splitPoint < 1.0 ? nbSamples - nbTrainSamples : nbSamples; + const size_t trainingSamplesSize = splitPoint < 1.0 ? COVER_sum(samplesSizes, nbTrainSamples) : totalSamplesSize; + const size_t testSamplesSize = splitPoint < 1.0 ? COVER_sum(samplesSizes + nbTrainSamples, nbTestSamples) : totalSamplesSize; + + /* Checks */ + if (totalSamplesSize < MAX(d, sizeof(U64)) || + totalSamplesSize >= (size_t)FASTCOVER_MAX_SAMPLES_SIZE) { + DISPLAYLEVEL(1, "Total samples size is too large (%u MB), maximum size is %u MB\n", + (unsigned)(totalSamplesSize >> 20), (FASTCOVER_MAX_SAMPLES_SIZE >> 20)); + return ERROR(srcSize_wrong); + } + + /* Check if there are at least 5 training samples */ + if (nbTrainSamples < 5) { + DISPLAYLEVEL(1, "Total number of training samples is %u and is invalid\n", nbTrainSamples); + return ERROR(srcSize_wrong); + } + + /* Check if there's testing sample */ + if (nbTestSamples < 1) { + DISPLAYLEVEL(1, "Total number of testing samples is %u and is invalid.\n", nbTestSamples); + return ERROR(srcSize_wrong); + } + + /* Zero the context */ + memset(ctx, 0, sizeof(*ctx)); + DISPLAYLEVEL(2, "Training on %u samples of total size %u\n", nbTrainSamples, + (unsigned)trainingSamplesSize); + DISPLAYLEVEL(2, "Testing on %u samples of total size %u\n", nbTestSamples, + (unsigned)testSamplesSize); + + ctx->samples = samples; + ctx->samplesSizes = samplesSizes; + ctx->nbSamples = nbSamples; + ctx->nbTrainSamples = nbTrainSamples; + ctx->nbTestSamples = nbTestSamples; + ctx->nbDmers = trainingSamplesSize - MAX(d, sizeof(U64)) + 1; + ctx->d = d; + ctx->f = f; + ctx->accelParams = accelParams; + + /* The offsets of each file */ + ctx->offsets = (size_t*)calloc((nbSamples + 1), sizeof(size_t)); + if (ctx->offsets == NULL) { + DISPLAYLEVEL(1, "Failed to allocate scratch buffers \n"); + FASTCOVER_ctx_destroy(ctx); + return ERROR(memory_allocation); + } + + /* Fill offsets from the samplesSizes */ + { U32 i; + ctx->offsets[0] = 0; + assert(nbSamples >= 5); + for (i = 1; i <= nbSamples; ++i) { + ctx->offsets[i] = ctx->offsets[i - 1] + samplesSizes[i - 1]; + } + } + + /* Initialize frequency array of size 2^f */ + ctx->freqs = (U32*)calloc(((U64)1 << f), sizeof(U32)); + if (ctx->freqs == NULL) { + DISPLAYLEVEL(1, "Failed to allocate frequency table \n"); + FASTCOVER_ctx_destroy(ctx); + return ERROR(memory_allocation); + } + + DISPLAYLEVEL(2, "Computing frequencies\n"); + FASTCOVER_computeFrequency(ctx->freqs, ctx); + + return 0; +} + + +/** + * Given the prepared context build the dictionary. + */ +static size_t +FASTCOVER_buildDictionary(const FASTCOVER_ctx_t* ctx, + U32* freqs, + void* dictBuffer, size_t dictBufferCapacity, + ZDICT_cover_params_t parameters, + U16* segmentFreqs) +{ + BYTE *const dict = (BYTE *)dictBuffer; + size_t tail = dictBufferCapacity; + /* Divide the data into epochs. We will select one segment from each epoch. */ + const COVER_epoch_info_t epochs = COVER_computeEpochs( + (U32)dictBufferCapacity, (U32)ctx->nbDmers, parameters.k, 1); + const size_t maxZeroScoreRun = 10; + size_t zeroScoreRun = 0; + size_t epoch; + DISPLAYLEVEL(2, "Breaking content into %u epochs of size %u\n", + (U32)epochs.num, (U32)epochs.size); + /* Loop through the epochs until there are no more segments or the dictionary + * is full. + */ + for (epoch = 0; tail > 0; epoch = (epoch + 1) % epochs.num) { + const U32 epochBegin = (U32)(epoch * epochs.size); + const U32 epochEnd = epochBegin + epochs.size; + size_t segmentSize; + /* Select a segment */ + COVER_segment_t segment = FASTCOVER_selectSegment( + ctx, freqs, epochBegin, epochEnd, parameters, segmentFreqs); + + /* If the segment covers no dmers, then we are out of content. + * There may be new content in other epochs, for continue for some time. + */ + if (segment.score == 0) { + if (++zeroScoreRun >= maxZeroScoreRun) { + break; + } + continue; + } + zeroScoreRun = 0; + + /* Trim the segment if necessary and if it is too small then we are done */ + segmentSize = MIN(segment.end - segment.begin + parameters.d - 1, tail); + if (segmentSize < parameters.d) { + break; + } + + /* We fill the dictionary from the back to allow the best segments to be + * referenced with the smallest offsets. + */ + tail -= segmentSize; + memcpy(dict + tail, ctx->samples + segment.begin, segmentSize); + DISPLAYUPDATE( + 2, "\r%u%% ", + (unsigned)(((dictBufferCapacity - tail) * 100) / dictBufferCapacity)); + } + DISPLAYLEVEL(2, "\r%79s\r", ""); + return tail; +} + +/** + * Parameters for FASTCOVER_tryParameters(). + */ +typedef struct FASTCOVER_tryParameters_data_s { + const FASTCOVER_ctx_t* ctx; + COVER_best_t* best; + size_t dictBufferCapacity; + ZDICT_cover_params_t parameters; +} FASTCOVER_tryParameters_data_t; + + +/** + * Tries a set of parameters and updates the COVER_best_t with the results. + * This function is thread safe if zstd is compiled with multithreaded support. + * It takes its parameters as an *OWNING* opaque pointer to support threading. + */ +static void FASTCOVER_tryParameters(void* opaque) +{ + /* Save parameters as local variables */ + FASTCOVER_tryParameters_data_t *const data = (FASTCOVER_tryParameters_data_t*)opaque; + const FASTCOVER_ctx_t *const ctx = data->ctx; + const ZDICT_cover_params_t parameters = data->parameters; + size_t dictBufferCapacity = data->dictBufferCapacity; + size_t totalCompressedSize = ERROR(GENERIC); + /* Initialize array to keep track of frequency of dmer within activeSegment */ + U16* segmentFreqs = (U16*)calloc(((U64)1 << ctx->f), sizeof(U16)); + /* Allocate space for hash table, dict, and freqs */ + BYTE *const dict = (BYTE*)malloc(dictBufferCapacity); + COVER_dictSelection_t selection = COVER_dictSelectionError(ERROR(GENERIC)); + U32* freqs = (U32*) malloc(((U64)1 << ctx->f) * sizeof(U32)); + if (!segmentFreqs || !dict || !freqs) { + DISPLAYLEVEL(1, "Failed to allocate buffers: out of memory\n"); + goto _cleanup; + } + /* Copy the frequencies because we need to modify them */ + memcpy(freqs, ctx->freqs, ((U64)1 << ctx->f) * sizeof(U32)); + /* Build the dictionary */ + { const size_t tail = FASTCOVER_buildDictionary(ctx, freqs, dict, dictBufferCapacity, + parameters, segmentFreqs); + + const unsigned nbFinalizeSamples = (unsigned)(ctx->nbTrainSamples * ctx->accelParams.finalize / 100); + selection = COVER_selectDict(dict + tail, dictBufferCapacity, dictBufferCapacity - tail, + ctx->samples, ctx->samplesSizes, nbFinalizeSamples, ctx->nbTrainSamples, ctx->nbSamples, parameters, ctx->offsets, + totalCompressedSize); + + if (COVER_dictSelectionIsError(selection)) { + DISPLAYLEVEL(1, "Failed to select dictionary\n"); + goto _cleanup; + } + } +_cleanup: + free(dict); + COVER_best_finish(data->best, parameters, selection); + free(data); + free(segmentFreqs); + COVER_dictSelectionFree(selection); + free(freqs); +} + + +static void +FASTCOVER_convertToCoverParams(ZDICT_fastCover_params_t fastCoverParams, + ZDICT_cover_params_t* coverParams) +{ + coverParams->k = fastCoverParams.k; + coverParams->d = fastCoverParams.d; + coverParams->steps = fastCoverParams.steps; + coverParams->nbThreads = fastCoverParams.nbThreads; + coverParams->splitPoint = fastCoverParams.splitPoint; + coverParams->zParams = fastCoverParams.zParams; + coverParams->shrinkDict = fastCoverParams.shrinkDict; +} + + +static void +FASTCOVER_convertToFastCoverParams(ZDICT_cover_params_t coverParams, + ZDICT_fastCover_params_t* fastCoverParams, + unsigned f, unsigned accel) +{ + fastCoverParams->k = coverParams.k; + fastCoverParams->d = coverParams.d; + fastCoverParams->steps = coverParams.steps; + fastCoverParams->nbThreads = coverParams.nbThreads; + fastCoverParams->splitPoint = coverParams.splitPoint; + fastCoverParams->f = f; + fastCoverParams->accel = accel; + fastCoverParams->zParams = coverParams.zParams; + fastCoverParams->shrinkDict = coverParams.shrinkDict; +} + + +ZDICTLIB_API size_t +ZDICT_trainFromBuffer_fastCover(void* dictBuffer, size_t dictBufferCapacity, + const void* samplesBuffer, + const size_t* samplesSizes, unsigned nbSamples, + ZDICT_fastCover_params_t parameters) +{ + BYTE* const dict = (BYTE*)dictBuffer; + FASTCOVER_ctx_t ctx; + ZDICT_cover_params_t coverParams; + FASTCOVER_accel_t accelParams; + /* Initialize global data */ + g_displayLevel = parameters.zParams.notificationLevel; + /* Assign splitPoint and f if not provided */ + parameters.splitPoint = 1.0; + parameters.f = parameters.f == 0 ? DEFAULT_F : parameters.f; + parameters.accel = parameters.accel == 0 ? DEFAULT_ACCEL : parameters.accel; + /* Convert to cover parameter */ + memset(&coverParams, 0 , sizeof(coverParams)); + FASTCOVER_convertToCoverParams(parameters, &coverParams); + /* Checks */ + if (!FASTCOVER_checkParameters(coverParams, dictBufferCapacity, parameters.f, + parameters.accel)) { + DISPLAYLEVEL(1, "FASTCOVER parameters incorrect\n"); + return ERROR(parameter_outOfBound); + } + if (nbSamples == 0) { + DISPLAYLEVEL(1, "FASTCOVER must have at least one input file\n"); + return ERROR(srcSize_wrong); + } + if (dictBufferCapacity < ZDICT_DICTSIZE_MIN) { + DISPLAYLEVEL(1, "dictBufferCapacity must be at least %u\n", + ZDICT_DICTSIZE_MIN); + return ERROR(dstSize_tooSmall); + } + /* Assign corresponding FASTCOVER_accel_t to accelParams*/ + accelParams = FASTCOVER_defaultAccelParameters[parameters.accel]; + /* Initialize context */ + { + size_t const initVal = FASTCOVER_ctx_init(&ctx, samplesBuffer, samplesSizes, nbSamples, + coverParams.d, parameters.splitPoint, parameters.f, + accelParams); + if (ZSTD_isError(initVal)) { + DISPLAYLEVEL(1, "Failed to initialize context\n"); + return initVal; + } + } + COVER_warnOnSmallCorpus(dictBufferCapacity, ctx.nbDmers, g_displayLevel); + /* Build the dictionary */ + DISPLAYLEVEL(2, "Building dictionary\n"); + { + /* Initialize array to keep track of frequency of dmer within activeSegment */ + U16* segmentFreqs = (U16 *)calloc(((U64)1 << parameters.f), sizeof(U16)); + const size_t tail = FASTCOVER_buildDictionary(&ctx, ctx.freqs, dictBuffer, + dictBufferCapacity, coverParams, segmentFreqs); + const unsigned nbFinalizeSamples = (unsigned)(ctx.nbTrainSamples * ctx.accelParams.finalize / 100); + const size_t dictionarySize = ZDICT_finalizeDictionary( + dict, dictBufferCapacity, dict + tail, dictBufferCapacity - tail, + samplesBuffer, samplesSizes, nbFinalizeSamples, coverParams.zParams); + if (!ZSTD_isError(dictionarySize)) { + DISPLAYLEVEL(2, "Constructed dictionary of size %u\n", + (unsigned)dictionarySize); + } + FASTCOVER_ctx_destroy(&ctx); + free(segmentFreqs); + return dictionarySize; + } +} + + +ZDICTLIB_API size_t +ZDICT_optimizeTrainFromBuffer_fastCover( + void* dictBuffer, size_t dictBufferCapacity, + const void* samplesBuffer, + const size_t* samplesSizes, unsigned nbSamples, + ZDICT_fastCover_params_t* parameters) +{ + ZDICT_cover_params_t coverParams; + FASTCOVER_accel_t accelParams; + /* constants */ + const unsigned nbThreads = parameters->nbThreads; + const double splitPoint = + parameters->splitPoint <= 0.0 ? FASTCOVER_DEFAULT_SPLITPOINT : parameters->splitPoint; + const unsigned kMinD = parameters->d == 0 ? 6 : parameters->d; + const unsigned kMaxD = parameters->d == 0 ? 8 : parameters->d; + const unsigned kMinK = parameters->k == 0 ? 50 : parameters->k; + const unsigned kMaxK = parameters->k == 0 ? 2000 : parameters->k; + const unsigned kSteps = parameters->steps == 0 ? 40 : parameters->steps; + const unsigned kStepSize = MAX((kMaxK - kMinK) / kSteps, 1); + const unsigned kIterations = + (1 + (kMaxD - kMinD) / 2) * (1 + (kMaxK - kMinK) / kStepSize); + const unsigned f = parameters->f == 0 ? DEFAULT_F : parameters->f; + const unsigned accel = parameters->accel == 0 ? DEFAULT_ACCEL : parameters->accel; + const unsigned shrinkDict = 0; + /* Local variables */ + const int displayLevel = parameters->zParams.notificationLevel; + unsigned iteration = 1; + unsigned d; + unsigned k; + COVER_best_t best; + POOL_ctx *pool = NULL; + int warned = 0; + /* Checks */ + if (splitPoint <= 0 || splitPoint > 1) { + LOCALDISPLAYLEVEL(displayLevel, 1, "Incorrect splitPoint\n"); + return ERROR(parameter_outOfBound); + } + if (accel == 0 || accel > FASTCOVER_MAX_ACCEL) { + LOCALDISPLAYLEVEL(displayLevel, 1, "Incorrect accel\n"); + return ERROR(parameter_outOfBound); + } + if (kMinK < kMaxD || kMaxK < kMinK) { + LOCALDISPLAYLEVEL(displayLevel, 1, "Incorrect k\n"); + return ERROR(parameter_outOfBound); + } + if (nbSamples == 0) { + LOCALDISPLAYLEVEL(displayLevel, 1, "FASTCOVER must have at least one input file\n"); + return ERROR(srcSize_wrong); + } + if (dictBufferCapacity < ZDICT_DICTSIZE_MIN) { + LOCALDISPLAYLEVEL(displayLevel, 1, "dictBufferCapacity must be at least %u\n", + ZDICT_DICTSIZE_MIN); + return ERROR(dstSize_tooSmall); + } + if (nbThreads > 1) { + pool = POOL_create(nbThreads, 1); + if (!pool) { + return ERROR(memory_allocation); + } + } + /* Initialization */ + COVER_best_init(&best); + memset(&coverParams, 0 , sizeof(coverParams)); + FASTCOVER_convertToCoverParams(*parameters, &coverParams); + accelParams = FASTCOVER_defaultAccelParameters[accel]; + /* Turn down global display level to clean up display at level 2 and below */ + g_displayLevel = displayLevel == 0 ? 0 : displayLevel - 1; + /* Loop through d first because each new value needs a new context */ + LOCALDISPLAYLEVEL(displayLevel, 2, "Trying %u different sets of parameters\n", + kIterations); + for (d = kMinD; d <= kMaxD; d += 2) { + /* Initialize the context for this value of d */ + FASTCOVER_ctx_t ctx; + LOCALDISPLAYLEVEL(displayLevel, 3, "d=%u\n", d); + { + size_t const initVal = FASTCOVER_ctx_init(&ctx, samplesBuffer, samplesSizes, nbSamples, d, splitPoint, f, accelParams); + if (ZSTD_isError(initVal)) { + LOCALDISPLAYLEVEL(displayLevel, 1, "Failed to initialize context\n"); + COVER_best_destroy(&best); + POOL_free(pool); + return initVal; + } + } + if (!warned) { + COVER_warnOnSmallCorpus(dictBufferCapacity, ctx.nbDmers, displayLevel); + warned = 1; + } + /* Loop through k reusing the same context */ + for (k = kMinK; k <= kMaxK; k += kStepSize) { + /* Prepare the arguments */ + FASTCOVER_tryParameters_data_t *data = (FASTCOVER_tryParameters_data_t *)malloc( + sizeof(FASTCOVER_tryParameters_data_t)); + LOCALDISPLAYLEVEL(displayLevel, 3, "k=%u\n", k); + if (!data) { + LOCALDISPLAYLEVEL(displayLevel, 1, "Failed to allocate parameters\n"); + COVER_best_destroy(&best); + FASTCOVER_ctx_destroy(&ctx); + POOL_free(pool); + return ERROR(memory_allocation); + } + data->ctx = &ctx; + data->best = &best; + data->dictBufferCapacity = dictBufferCapacity; + data->parameters = coverParams; + data->parameters.k = k; + data->parameters.d = d; + data->parameters.splitPoint = splitPoint; + data->parameters.steps = kSteps; + data->parameters.shrinkDict = shrinkDict; + data->parameters.zParams.notificationLevel = g_displayLevel; + /* Check the parameters */ + if (!FASTCOVER_checkParameters(data->parameters, dictBufferCapacity, + data->ctx->f, accel)) { + DISPLAYLEVEL(1, "FASTCOVER parameters incorrect\n"); + free(data); + continue; + } + /* Call the function and pass ownership of data to it */ + COVER_best_start(&best); + if (pool) { + POOL_add(pool, &FASTCOVER_tryParameters, data); + } else { + FASTCOVER_tryParameters(data); + } + /* Print status */ + LOCALDISPLAYUPDATE(displayLevel, 2, "\r%u%% ", + (unsigned)((iteration * 100) / kIterations)); + ++iteration; + } + COVER_best_wait(&best); + FASTCOVER_ctx_destroy(&ctx); + } + LOCALDISPLAYLEVEL(displayLevel, 2, "\r%79s\r", ""); + /* Fill the output buffer and parameters with output of the best parameters */ + { + const size_t dictSize = best.dictSize; + if (ZSTD_isError(best.compressedSize)) { + const size_t compressedSize = best.compressedSize; + COVER_best_destroy(&best); + POOL_free(pool); + return compressedSize; + } + FASTCOVER_convertToFastCoverParams(best.parameters, parameters, f, accel); + memcpy(dictBuffer, best.dict, dictSize); + COVER_best_destroy(&best); + POOL_free(pool); + return dictSize; + } + +} diff --git a/external/zstd/lib/dictBuilder/zdict.c b/external/zstd/lib/dictBuilder/zdict.c new file mode 100644 index 00000000..459cbe4d --- /dev/null +++ b/external/zstd/lib/dictBuilder/zdict.c @@ -0,0 +1,1134 @@ +/* + * Copyright (c) Yann Collet, Facebook, Inc. + * All rights reserved. + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. + */ + + +/*-************************************** +* Tuning parameters +****************************************/ +#define MINRATIO 4 /* minimum nb of apparition to be selected in dictionary */ +#define ZDICT_MAX_SAMPLES_SIZE (2000U << 20) +#define ZDICT_MIN_SAMPLES_SIZE (ZDICT_CONTENTSIZE_MIN * MINRATIO) + + +/*-************************************** +* Compiler Options +****************************************/ +/* Unix Large Files support (>4GB) */ +#define _FILE_OFFSET_BITS 64 +#if (defined(__sun__) && (!defined(__LP64__))) /* Sun Solaris 32-bits requires specific definitions */ +# ifndef _LARGEFILE_SOURCE +# define _LARGEFILE_SOURCE +# endif +#elif ! defined(__LP64__) /* No point defining Large file for 64 bit */ +# ifndef _LARGEFILE64_SOURCE +# define _LARGEFILE64_SOURCE +# endif +#endif + + +/*-************************************* +* Dependencies +***************************************/ +#include /* malloc, free */ +#include /* memset */ +#include /* fprintf, fopen, ftello64 */ +#include /* clock */ + +#ifndef ZDICT_STATIC_LINKING_ONLY +# define ZDICT_STATIC_LINKING_ONLY +#endif +#define HUF_STATIC_LINKING_ONLY + +#include "../common/mem.h" /* read */ +#include "../common/fse.h" /* FSE_normalizeCount, FSE_writeNCount */ +#include "../common/huf.h" /* HUF_buildCTable, HUF_writeCTable */ +#include "../common/zstd_internal.h" /* includes zstd.h */ +#include "../common/xxhash.h" /* XXH64 */ +#include "../compress/zstd_compress_internal.h" /* ZSTD_loadCEntropy() */ +#include "../zdict.h" +#include "divsufsort.h" + + +/*-************************************* +* Constants +***************************************/ +#define KB *(1 <<10) +#define MB *(1 <<20) +#define GB *(1U<<30) + +#define DICTLISTSIZE_DEFAULT 10000 + +#define NOISELENGTH 32 + +static const U32 g_selectivity_default = 9; + + +/*-************************************* +* Console display +***************************************/ +#undef DISPLAY +#define DISPLAY(...) { fprintf(stderr, __VA_ARGS__); fflush( stderr ); } +#undef DISPLAYLEVEL +#define DISPLAYLEVEL(l, ...) if (notificationLevel>=l) { DISPLAY(__VA_ARGS__); } /* 0 : no display; 1: errors; 2: default; 3: details; 4: debug */ + +static clock_t ZDICT_clockSpan(clock_t nPrevious) { return clock() - nPrevious; } + +static void ZDICT_printHex(const void* ptr, size_t length) +{ + const BYTE* const b = (const BYTE*)ptr; + size_t u; + for (u=0; u126) c = '.'; /* non-printable char */ + DISPLAY("%c", c); + } +} + + +/*-******************************************************** +* Helper functions +**********************************************************/ +unsigned ZDICT_isError(size_t errorCode) { return ERR_isError(errorCode); } + +const char* ZDICT_getErrorName(size_t errorCode) { return ERR_getErrorName(errorCode); } + +unsigned ZDICT_getDictID(const void* dictBuffer, size_t dictSize) +{ + if (dictSize < 8) return 0; + if (MEM_readLE32(dictBuffer) != ZSTD_MAGIC_DICTIONARY) return 0; + return MEM_readLE32((const char*)dictBuffer + 4); +} + +size_t ZDICT_getDictHeaderSize(const void* dictBuffer, size_t dictSize) +{ + size_t headerSize; + if (dictSize <= 8 || MEM_readLE32(dictBuffer) != ZSTD_MAGIC_DICTIONARY) return ERROR(dictionary_corrupted); + + { ZSTD_compressedBlockState_t* bs = (ZSTD_compressedBlockState_t*)malloc(sizeof(ZSTD_compressedBlockState_t)); + U32* wksp = (U32*)malloc(HUF_WORKSPACE_SIZE); + if (!bs || !wksp) { + headerSize = ERROR(memory_allocation); + } else { + ZSTD_reset_compressedBlockState(bs); + headerSize = ZSTD_loadCEntropy(bs, wksp, dictBuffer, dictSize); + } + + free(bs); + free(wksp); + } + + return headerSize; +} + +/*-******************************************************** +* Dictionary training functions +**********************************************************/ +static unsigned ZDICT_NbCommonBytes (size_t val) +{ + if (MEM_isLittleEndian()) { + if (MEM_64bits()) { +# if defined(_MSC_VER) && defined(_WIN64) + unsigned long r = 0; + _BitScanForward64( &r, (U64)val ); + return (unsigned)(r>>3); +# elif defined(__GNUC__) && (__GNUC__ >= 3) + return (__builtin_ctzll((U64)val) >> 3); +# else + static const int DeBruijnBytePos[64] = { 0, 0, 0, 0, 0, 1, 1, 2, 0, 3, 1, 3, 1, 4, 2, 7, 0, 2, 3, 6, 1, 5, 3, 5, 1, 3, 4, 4, 2, 5, 6, 7, 7, 0, 1, 2, 3, 3, 4, 6, 2, 6, 5, 5, 3, 4, 5, 6, 7, 1, 2, 4, 6, 4, 4, 5, 7, 2, 6, 5, 7, 6, 7, 7 }; + return DeBruijnBytePos[((U64)((val & -(long long)val) * 0x0218A392CDABBD3FULL)) >> 58]; +# endif + } else { /* 32 bits */ +# if defined(_MSC_VER) + unsigned long r=0; + _BitScanForward( &r, (U32)val ); + return (unsigned)(r>>3); +# elif defined(__GNUC__) && (__GNUC__ >= 3) + return (__builtin_ctz((U32)val) >> 3); +# else + static const int DeBruijnBytePos[32] = { 0, 0, 3, 0, 3, 1, 3, 0, 3, 2, 2, 1, 3, 2, 0, 1, 3, 3, 1, 2, 2, 2, 2, 0, 3, 1, 2, 0, 1, 0, 1, 1 }; + return DeBruijnBytePos[((U32)((val & -(S32)val) * 0x077CB531U)) >> 27]; +# endif + } + } else { /* Big Endian CPU */ + if (MEM_64bits()) { +# if defined(_MSC_VER) && defined(_WIN64) + unsigned long r = 0; + _BitScanReverse64( &r, val ); + return (unsigned)(r>>3); +# elif defined(__GNUC__) && (__GNUC__ >= 3) + return (__builtin_clzll(val) >> 3); +# else + unsigned r; + const unsigned n32 = sizeof(size_t)*4; /* calculate this way due to compiler complaining in 32-bits mode */ + if (!(val>>n32)) { r=4; } else { r=0; val>>=n32; } + if (!(val>>16)) { r+=2; val>>=8; } else { val>>=24; } + r += (!val); + return r; +# endif + } else { /* 32 bits */ +# if defined(_MSC_VER) + unsigned long r = 0; + _BitScanReverse( &r, (unsigned long)val ); + return (unsigned)(r>>3); +# elif defined(__GNUC__) && (__GNUC__ >= 3) + return (__builtin_clz((U32)val) >> 3); +# else + unsigned r; + if (!(val>>16)) { r=2; val>>=8; } else { r=0; val>>=24; } + r += (!val); + return r; +# endif + } } +} + + +/*! ZDICT_count() : + Count the nb of common bytes between 2 pointers. + Note : this function presumes end of buffer followed by noisy guard band. +*/ +static size_t ZDICT_count(const void* pIn, const void* pMatch) +{ + const char* const pStart = (const char*)pIn; + for (;;) { + size_t const diff = MEM_readST(pMatch) ^ MEM_readST(pIn); + if (!diff) { + pIn = (const char*)pIn+sizeof(size_t); + pMatch = (const char*)pMatch+sizeof(size_t); + continue; + } + pIn = (const char*)pIn+ZDICT_NbCommonBytes(diff); + return (size_t)((const char*)pIn - pStart); + } +} + + +typedef struct { + U32 pos; + U32 length; + U32 savings; +} dictItem; + +static void ZDICT_initDictItem(dictItem* d) +{ + d->pos = 1; + d->length = 0; + d->savings = (U32)(-1); +} + + +#define LLIMIT 64 /* heuristic determined experimentally */ +#define MINMATCHLENGTH 7 /* heuristic determined experimentally */ +static dictItem ZDICT_analyzePos( + BYTE* doneMarks, + const int* suffix, U32 start, + const void* buffer, U32 minRatio, U32 notificationLevel) +{ + U32 lengthList[LLIMIT] = {0}; + U32 cumulLength[LLIMIT] = {0}; + U32 savings[LLIMIT] = {0}; + const BYTE* b = (const BYTE*)buffer; + size_t maxLength = LLIMIT; + size_t pos = suffix[start]; + U32 end = start; + dictItem solution; + + /* init */ + memset(&solution, 0, sizeof(solution)); + doneMarks[pos] = 1; + + /* trivial repetition cases */ + if ( (MEM_read16(b+pos+0) == MEM_read16(b+pos+2)) + ||(MEM_read16(b+pos+1) == MEM_read16(b+pos+3)) + ||(MEM_read16(b+pos+2) == MEM_read16(b+pos+4)) ) { + /* skip and mark segment */ + U16 const pattern16 = MEM_read16(b+pos+4); + U32 u, patternEnd = 6; + while (MEM_read16(b+pos+patternEnd) == pattern16) patternEnd+=2 ; + if (b[pos+patternEnd] == b[pos+patternEnd-1]) patternEnd++; + for (u=1; u= MINMATCHLENGTH); + } + + /* look backward */ + { size_t length; + do { + length = ZDICT_count(b + pos, b + *(suffix+start-1)); + if (length >=MINMATCHLENGTH) start--; + } while(length >= MINMATCHLENGTH); + } + + /* exit if not found a minimum nb of repetitions */ + if (end-start < minRatio) { + U32 idx; + for(idx=start; idx= %i at pos %7u ", (unsigned)(end-start), MINMATCHLENGTH, (unsigned)pos); + DISPLAYLEVEL(4, "\n"); + + for (mml = MINMATCHLENGTH ; ; mml++) { + BYTE currentChar = 0; + U32 currentCount = 0; + U32 currentID = refinedStart; + U32 id; + U32 selectedCount = 0; + U32 selectedID = currentID; + for (id =refinedStart; id < refinedEnd; id++) { + if (b[suffix[id] + mml] != currentChar) { + if (currentCount > selectedCount) { + selectedCount = currentCount; + selectedID = currentID; + } + currentID = id; + currentChar = b[ suffix[id] + mml]; + currentCount = 0; + } + currentCount ++; + } + if (currentCount > selectedCount) { /* for last */ + selectedCount = currentCount; + selectedID = currentID; + } + + if (selectedCount < minRatio) + break; + refinedStart = selectedID; + refinedEnd = refinedStart + selectedCount; + } + + /* evaluate gain based on new dict */ + start = refinedStart; + pos = suffix[refinedStart]; + end = start; + memset(lengthList, 0, sizeof(lengthList)); + + /* look forward */ + { size_t length; + do { + end++; + length = ZDICT_count(b + pos, b + suffix[end]); + if (length >= LLIMIT) length = LLIMIT-1; + lengthList[length]++; + } while (length >=MINMATCHLENGTH); + } + + /* look backward */ + { size_t length = MINMATCHLENGTH; + while ((length >= MINMATCHLENGTH) & (start > 0)) { + length = ZDICT_count(b + pos, b + suffix[start - 1]); + if (length >= LLIMIT) length = LLIMIT - 1; + lengthList[length]++; + if (length >= MINMATCHLENGTH) start--; + } + } + + /* largest useful length */ + memset(cumulLength, 0, sizeof(cumulLength)); + cumulLength[maxLength-1] = lengthList[maxLength-1]; + for (i=(int)(maxLength-2); i>=0; i--) + cumulLength[i] = cumulLength[i+1] + lengthList[i]; + + for (i=LLIMIT-1; i>=MINMATCHLENGTH; i--) if (cumulLength[i]>=minRatio) break; + maxLength = i; + + /* reduce maxLength in case of final into repetitive data */ + { U32 l = (U32)maxLength; + BYTE const c = b[pos + maxLength-1]; + while (b[pos+l-2]==c) l--; + maxLength = l; + } + if (maxLength < MINMATCHLENGTH) return solution; /* skip : no long-enough solution */ + + /* calculate savings */ + savings[5] = 0; + for (i=MINMATCHLENGTH; i<=(int)maxLength; i++) + savings[i] = savings[i-1] + (lengthList[i] * (i-3)); + + DISPLAYLEVEL(4, "Selected dict at position %u, of length %u : saves %u (ratio: %.2f) \n", + (unsigned)pos, (unsigned)maxLength, (unsigned)savings[maxLength], (double)savings[maxLength] / maxLength); + + solution.pos = (U32)pos; + solution.length = (U32)maxLength; + solution.savings = savings[maxLength]; + + /* mark positions done */ + { U32 id; + for (id=start; id solution.length) length = solution.length; + } + pEnd = (U32)(testedPos + length); + for (p=testedPos; ppos; + const U32 eltEnd = elt.pos + elt.length; + const char* const buf = (const char*) buffer; + + /* tail overlap */ + U32 u; for (u=1; u elt.pos) && (table[u].pos <= eltEnd)) { /* overlap, existing > new */ + /* append */ + U32 const addedLength = table[u].pos - elt.pos; + table[u].length += addedLength; + table[u].pos = elt.pos; + table[u].savings += elt.savings * addedLength / elt.length; /* rough approx */ + table[u].savings += elt.length / 8; /* rough approx bonus */ + elt = table[u]; + /* sort : improve rank */ + while ((u>1) && (table[u-1].savings < elt.savings)) + table[u] = table[u-1], u--; + table[u] = elt; + return u; + } } + + /* front overlap */ + for (u=1; u= elt.pos) && (table[u].pos < elt.pos)) { /* overlap, existing < new */ + /* append */ + int const addedLength = (int)eltEnd - (table[u].pos + table[u].length); + table[u].savings += elt.length / 8; /* rough approx bonus */ + if (addedLength > 0) { /* otherwise, elt fully included into existing */ + table[u].length += addedLength; + table[u].savings += elt.savings * addedLength / elt.length; /* rough approx */ + } + /* sort : improve rank */ + elt = table[u]; + while ((u>1) && (table[u-1].savings < elt.savings)) + table[u] = table[u-1], u--; + table[u] = elt; + return u; + } + + if (MEM_read64(buf + table[u].pos) == MEM_read64(buf + elt.pos + 1)) { + if (isIncluded(buf + table[u].pos, buf + elt.pos + 1, table[u].length)) { + size_t const addedLength = MAX( (int)elt.length - (int)table[u].length , 1 ); + table[u].pos = elt.pos; + table[u].savings += (U32)(elt.savings * addedLength / elt.length); + table[u].length = MIN(elt.length, table[u].length + 1); + return u; + } + } + } + + return 0; +} + + +static void ZDICT_removeDictItem(dictItem* table, U32 id) +{ + /* convention : table[0].pos stores nb of elts */ + U32 const max = table[0].pos; + U32 u; + if (!id) return; /* protection, should never happen */ + for (u=id; upos--; +} + + +static void ZDICT_insertDictItem(dictItem* table, U32 maxSize, dictItem elt, const void* buffer) +{ + /* merge if possible */ + U32 mergeId = ZDICT_tryMerge(table, elt, 0, buffer); + if (mergeId) { + U32 newMerge = 1; + while (newMerge) { + newMerge = ZDICT_tryMerge(table, table[mergeId], mergeId, buffer); + if (newMerge) ZDICT_removeDictItem(table, mergeId); + mergeId = newMerge; + } + return; + } + + /* insert */ + { U32 current; + U32 nextElt = table->pos; + if (nextElt >= maxSize) nextElt = maxSize-1; + current = nextElt-1; + while (table[current].savings < elt.savings) { + table[current+1] = table[current]; + current--; + } + table[current+1] = elt; + table->pos = nextElt+1; + } +} + + +static U32 ZDICT_dictSize(const dictItem* dictList) +{ + U32 u, dictSize = 0; + for (u=1; u=l) { \ + if (ZDICT_clockSpan(displayClock) > refreshRate) \ + { displayClock = clock(); DISPLAY(__VA_ARGS__); \ + if (notificationLevel>=4) fflush(stderr); } } + + /* init */ + DISPLAYLEVEL(2, "\r%70s\r", ""); /* clean display line */ + if (!suffix0 || !reverseSuffix || !doneMarks || !filePos) { + result = ERROR(memory_allocation); + goto _cleanup; + } + if (minRatio < MINRATIO) minRatio = MINRATIO; + memset(doneMarks, 0, bufferSize+16); + + /* limit sample set size (divsufsort limitation)*/ + if (bufferSize > ZDICT_MAX_SAMPLES_SIZE) DISPLAYLEVEL(3, "sample set too large : reduced to %u MB ...\n", (unsigned)(ZDICT_MAX_SAMPLES_SIZE>>20)); + while (bufferSize > ZDICT_MAX_SAMPLES_SIZE) bufferSize -= fileSizes[--nbFiles]; + + /* sort */ + DISPLAYLEVEL(2, "sorting %u files of total size %u MB ...\n", nbFiles, (unsigned)(bufferSize>>20)); + { int const divSuftSortResult = divsufsort((const unsigned char*)buffer, suffix, (int)bufferSize, 0); + if (divSuftSortResult != 0) { result = ERROR(GENERIC); goto _cleanup; } + } + suffix[bufferSize] = (int)bufferSize; /* leads into noise */ + suffix0[0] = (int)bufferSize; /* leads into noise */ + /* build reverse suffix sort */ + { size_t pos; + for (pos=0; pos < bufferSize; pos++) + reverseSuffix[suffix[pos]] = (U32)pos; + /* note filePos tracks borders between samples. + It's not used at this stage, but planned to become useful in a later update */ + filePos[0] = 0; + for (pos=1; pos> 21); + } +} + + +typedef struct +{ + ZSTD_CDict* dict; /* dictionary */ + ZSTD_CCtx* zc; /* working context */ + void* workPlace; /* must be ZSTD_BLOCKSIZE_MAX allocated */ +} EStats_ress_t; + +#define MAXREPOFFSET 1024 + +static void ZDICT_countEStats(EStats_ress_t esr, const ZSTD_parameters* params, + unsigned* countLit, unsigned* offsetcodeCount, unsigned* matchlengthCount, unsigned* litlengthCount, U32* repOffsets, + const void* src, size_t srcSize, + U32 notificationLevel) +{ + size_t const blockSizeMax = MIN (ZSTD_BLOCKSIZE_MAX, 1 << params->cParams.windowLog); + size_t cSize; + + if (srcSize > blockSizeMax) srcSize = blockSizeMax; /* protection vs large samples */ + { size_t const errorCode = ZSTD_compressBegin_usingCDict(esr.zc, esr.dict); + if (ZSTD_isError(errorCode)) { DISPLAYLEVEL(1, "warning : ZSTD_compressBegin_usingCDict failed \n"); return; } + + } + cSize = ZSTD_compressBlock(esr.zc, esr.workPlace, ZSTD_BLOCKSIZE_MAX, src, srcSize); + if (ZSTD_isError(cSize)) { DISPLAYLEVEL(3, "warning : could not compress sample size %u \n", (unsigned)srcSize); return; } + + if (cSize) { /* if == 0; block is not compressible */ + const seqStore_t* const seqStorePtr = ZSTD_getSeqStore(esr.zc); + + /* literals stats */ + { const BYTE* bytePtr; + for(bytePtr = seqStorePtr->litStart; bytePtr < seqStorePtr->lit; bytePtr++) + countLit[*bytePtr]++; + } + + /* seqStats */ + { U32 const nbSeq = (U32)(seqStorePtr->sequences - seqStorePtr->sequencesStart); + ZSTD_seqToCodes(seqStorePtr); + + { const BYTE* codePtr = seqStorePtr->ofCode; + U32 u; + for (u=0; umlCode; + U32 u; + for (u=0; ullCode; + U32 u; + for (u=0; u= 2) { /* rep offsets */ + const seqDef* const seq = seqStorePtr->sequencesStart; + U32 offset1 = seq[0].offset - 3; + U32 offset2 = seq[1].offset - 3; + if (offset1 >= MAXREPOFFSET) offset1 = 0; + if (offset2 >= MAXREPOFFSET) offset2 = 0; + repOffsets[offset1] += 3; + repOffsets[offset2] += 1; + } } } +} + +static size_t ZDICT_totalSampleSize(const size_t* fileSizes, unsigned nbFiles) +{ + size_t total=0; + unsigned u; + for (u=0; u0; u--) { + offsetCount_t tmp; + if (table[u-1].count >= table[u].count) break; + tmp = table[u-1]; + table[u-1] = table[u]; + table[u] = tmp; + } +} + +/* ZDICT_flatLit() : + * rewrite `countLit` to contain a mostly flat but still compressible distribution of literals. + * necessary to avoid generating a non-compressible distribution that HUF_writeCTable() cannot encode. + */ +static void ZDICT_flatLit(unsigned* countLit) +{ + int u; + for (u=1; u<256; u++) countLit[u] = 2; + countLit[0] = 4; + countLit[253] = 1; + countLit[254] = 1; +} + +#define OFFCODE_MAX 30 /* only applicable to first block */ +static size_t ZDICT_analyzeEntropy(void* dstBuffer, size_t maxDstSize, + int compressionLevel, + const void* srcBuffer, const size_t* fileSizes, unsigned nbFiles, + const void* dictBuffer, size_t dictBufferSize, + unsigned notificationLevel) +{ + unsigned countLit[256]; + HUF_CREATE_STATIC_CTABLE(hufTable, 255); + unsigned offcodeCount[OFFCODE_MAX+1]; + short offcodeNCount[OFFCODE_MAX+1]; + U32 offcodeMax = ZSTD_highbit32((U32)(dictBufferSize + 128 KB)); + unsigned matchLengthCount[MaxML+1]; + short matchLengthNCount[MaxML+1]; + unsigned litLengthCount[MaxLL+1]; + short litLengthNCount[MaxLL+1]; + U32 repOffset[MAXREPOFFSET]; + offsetCount_t bestRepOffset[ZSTD_REP_NUM+1]; + EStats_ress_t esr = { NULL, NULL, NULL }; + ZSTD_parameters params; + U32 u, huffLog = 11, Offlog = OffFSELog, mlLog = MLFSELog, llLog = LLFSELog, total; + size_t pos = 0, errorCode; + size_t eSize = 0; + size_t const totalSrcSize = ZDICT_totalSampleSize(fileSizes, nbFiles); + size_t const averageSampleSize = totalSrcSize / (nbFiles + !nbFiles); + BYTE* dstPtr = (BYTE*)dstBuffer; + + /* init */ + DEBUGLOG(4, "ZDICT_analyzeEntropy"); + if (offcodeMax>OFFCODE_MAX) { eSize = ERROR(dictionaryCreation_failed); goto _cleanup; } /* too large dictionary */ + for (u=0; u<256; u++) countLit[u] = 1; /* any character must be described */ + for (u=0; u<=offcodeMax; u++) offcodeCount[u] = 1; + for (u=0; u<=MaxML; u++) matchLengthCount[u] = 1; + for (u=0; u<=MaxLL; u++) litLengthCount[u] = 1; + memset(repOffset, 0, sizeof(repOffset)); + repOffset[1] = repOffset[4] = repOffset[8] = 1; + memset(bestRepOffset, 0, sizeof(bestRepOffset)); + if (compressionLevel==0) compressionLevel = ZSTD_CLEVEL_DEFAULT; + params = ZSTD_getParams(compressionLevel, averageSampleSize, dictBufferSize); + + esr.dict = ZSTD_createCDict_advanced(dictBuffer, dictBufferSize, ZSTD_dlm_byRef, ZSTD_dct_rawContent, params.cParams, ZSTD_defaultCMem); + esr.zc = ZSTD_createCCtx(); + esr.workPlace = malloc(ZSTD_BLOCKSIZE_MAX); + if (!esr.dict || !esr.zc || !esr.workPlace) { + eSize = ERROR(memory_allocation); + DISPLAYLEVEL(1, "Not enough memory \n"); + goto _cleanup; + } + + /* collect stats on all samples */ + for (u=0; u dictBufferCapacity) dictContentSize = dictBufferCapacity - hSize; + { size_t const dictSize = hSize + dictContentSize; + char* dictEnd = (char*)dictBuffer + dictSize; + memmove(dictEnd - dictContentSize, customDictContent, dictContentSize); + memcpy(dictBuffer, header, hSize); + return dictSize; + } +} + + +static size_t ZDICT_addEntropyTablesFromBuffer_advanced( + void* dictBuffer, size_t dictContentSize, size_t dictBufferCapacity, + const void* samplesBuffer, const size_t* samplesSizes, unsigned nbSamples, + ZDICT_params_t params) +{ + int const compressionLevel = (params.compressionLevel == 0) ? ZSTD_CLEVEL_DEFAULT : params.compressionLevel; + U32 const notificationLevel = params.notificationLevel; + size_t hSize = 8; + + /* calculate entropy tables */ + DISPLAYLEVEL(2, "\r%70s\r", ""); /* clean display line */ + DISPLAYLEVEL(2, "statistics ... \n"); + { size_t const eSize = ZDICT_analyzeEntropy((char*)dictBuffer+hSize, dictBufferCapacity-hSize, + compressionLevel, + samplesBuffer, samplesSizes, nbSamples, + (char*)dictBuffer + dictBufferCapacity - dictContentSize, dictContentSize, + notificationLevel); + if (ZDICT_isError(eSize)) return eSize; + hSize += eSize; + } + + /* add dictionary header (after entropy tables) */ + MEM_writeLE32(dictBuffer, ZSTD_MAGIC_DICTIONARY); + { U64 const randomID = XXH64((char*)dictBuffer + dictBufferCapacity - dictContentSize, dictContentSize, 0); + U32 const compliantID = (randomID % ((1U<<31)-32768)) + 32768; + U32 const dictID = params.dictID ? params.dictID : compliantID; + MEM_writeLE32((char*)dictBuffer+4, dictID); + } + + if (hSize + dictContentSize < dictBufferCapacity) + memmove((char*)dictBuffer + hSize, (char*)dictBuffer + dictBufferCapacity - dictContentSize, dictContentSize); + return MIN(dictBufferCapacity, hSize+dictContentSize); +} + +/*! ZDICT_trainFromBuffer_unsafe_legacy() : +* Warning : `samplesBuffer` must be followed by noisy guard band !!! +* @return : size of dictionary, or an error code which can be tested with ZDICT_isError() +*/ +static size_t ZDICT_trainFromBuffer_unsafe_legacy( + void* dictBuffer, size_t maxDictSize, + const void* samplesBuffer, const size_t* samplesSizes, unsigned nbSamples, + ZDICT_legacy_params_t params) +{ + U32 const dictListSize = MAX(MAX(DICTLISTSIZE_DEFAULT, nbSamples), (U32)(maxDictSize/16)); + dictItem* const dictList = (dictItem*)malloc(dictListSize * sizeof(*dictList)); + unsigned const selectivity = params.selectivityLevel == 0 ? g_selectivity_default : params.selectivityLevel; + unsigned const minRep = (selectivity > 30) ? MINRATIO : nbSamples >> selectivity; + size_t const targetDictSize = maxDictSize; + size_t const samplesBuffSize = ZDICT_totalSampleSize(samplesSizes, nbSamples); + size_t dictSize = 0; + U32 const notificationLevel = params.zParams.notificationLevel; + + /* checks */ + if (!dictList) return ERROR(memory_allocation); + if (maxDictSize < ZDICT_DICTSIZE_MIN) { free(dictList); return ERROR(dstSize_tooSmall); } /* requested dictionary size is too small */ + if (samplesBuffSize < ZDICT_MIN_SAMPLES_SIZE) { free(dictList); return ERROR(dictionaryCreation_failed); } /* not enough source to create dictionary */ + + /* init */ + ZDICT_initDictItem(dictList); + + /* build dictionary */ + ZDICT_trainBuffer_legacy(dictList, dictListSize, + samplesBuffer, samplesBuffSize, + samplesSizes, nbSamples, + minRep, notificationLevel); + + /* display best matches */ + if (params.zParams.notificationLevel>= 3) { + unsigned const nb = MIN(25, dictList[0].pos); + unsigned const dictContentSize = ZDICT_dictSize(dictList); + unsigned u; + DISPLAYLEVEL(3, "\n %u segments found, of total size %u \n", (unsigned)dictList[0].pos-1, dictContentSize); + DISPLAYLEVEL(3, "list %u best segments \n", nb-1); + for (u=1; u samplesBuffSize) || ((pos + length) > samplesBuffSize)) { + free(dictList); + return ERROR(GENERIC); /* should never happen */ + } + DISPLAYLEVEL(3, "%3u:%3u bytes at pos %8u, savings %7u bytes |", + u, length, pos, (unsigned)dictList[u].savings); + ZDICT_printHex((const char*)samplesBuffer+pos, printedLength); + DISPLAYLEVEL(3, "| \n"); + } } + + + /* create dictionary */ + { unsigned dictContentSize = ZDICT_dictSize(dictList); + if (dictContentSize < ZDICT_CONTENTSIZE_MIN) { free(dictList); return ERROR(dictionaryCreation_failed); } /* dictionary content too small */ + if (dictContentSize < targetDictSize/4) { + DISPLAYLEVEL(2, "! warning : selected content significantly smaller than requested (%u < %u) \n", dictContentSize, (unsigned)maxDictSize); + if (samplesBuffSize < 10 * targetDictSize) + DISPLAYLEVEL(2, "! consider increasing the number of samples (total size : %u MB)\n", (unsigned)(samplesBuffSize>>20)); + if (minRep > MINRATIO) { + DISPLAYLEVEL(2, "! consider increasing selectivity to produce larger dictionary (-s%u) \n", selectivity+1); + DISPLAYLEVEL(2, "! note : larger dictionaries are not necessarily better, test its efficiency on samples \n"); + } + } + + if ((dictContentSize > targetDictSize*3) && (nbSamples > 2*MINRATIO) && (selectivity>1)) { + unsigned proposedSelectivity = selectivity-1; + while ((nbSamples >> proposedSelectivity) <= MINRATIO) { proposedSelectivity--; } + DISPLAYLEVEL(2, "! note : calculated dictionary significantly larger than requested (%u > %u) \n", dictContentSize, (unsigned)maxDictSize); + DISPLAYLEVEL(2, "! consider increasing dictionary size, or produce denser dictionary (-s%u) \n", proposedSelectivity); + DISPLAYLEVEL(2, "! always test dictionary efficiency on real samples \n"); + } + + /* limit dictionary size */ + { U32 const max = dictList->pos; /* convention : nb of useful elts within dictList */ + U32 currentSize = 0; + U32 n; for (n=1; n targetDictSize) { currentSize -= dictList[n].length; break; } + } + dictList->pos = n; + dictContentSize = currentSize; + } + + /* build dict content */ + { U32 u; + BYTE* ptr = (BYTE*)dictBuffer + maxDictSize; + for (u=1; upos; u++) { + U32 l = dictList[u].length; + ptr -= l; + if (ptr<(BYTE*)dictBuffer) { free(dictList); return ERROR(GENERIC); } /* should not happen */ + memcpy(ptr, (const char*)samplesBuffer+dictList[u].pos, l); + } } + + dictSize = ZDICT_addEntropyTablesFromBuffer_advanced(dictBuffer, dictContentSize, maxDictSize, + samplesBuffer, samplesSizes, nbSamples, + params.zParams); + } + + /* clean up */ + free(dictList); + return dictSize; +} + + +/* ZDICT_trainFromBuffer_legacy() : + * issue : samplesBuffer need to be followed by a noisy guard band. + * work around : duplicate the buffer, and add the noise */ +size_t ZDICT_trainFromBuffer_legacy(void* dictBuffer, size_t dictBufferCapacity, + const void* samplesBuffer, const size_t* samplesSizes, unsigned nbSamples, + ZDICT_legacy_params_t params) +{ + size_t result; + void* newBuff; + size_t const sBuffSize = ZDICT_totalSampleSize(samplesSizes, nbSamples); + if (sBuffSize < ZDICT_MIN_SAMPLES_SIZE) return 0; /* not enough content => no dictionary */ + + newBuff = malloc(sBuffSize + NOISELENGTH); + if (!newBuff) return ERROR(memory_allocation); + + memcpy(newBuff, samplesBuffer, sBuffSize); + ZDICT_fillNoise((char*)newBuff + sBuffSize, NOISELENGTH); /* guard band, for end of buffer condition */ + + result = + ZDICT_trainFromBuffer_unsafe_legacy(dictBuffer, dictBufferCapacity, newBuff, + samplesSizes, nbSamples, params); + free(newBuff); + return result; +} + + +size_t ZDICT_trainFromBuffer(void* dictBuffer, size_t dictBufferCapacity, + const void* samplesBuffer, const size_t* samplesSizes, unsigned nbSamples) +{ + ZDICT_fastCover_params_t params; + DEBUGLOG(3, "ZDICT_trainFromBuffer"); + memset(¶ms, 0, sizeof(params)); + params.d = 8; + params.steps = 4; + /* Use default level since no compression level information is available */ + params.zParams.compressionLevel = ZSTD_CLEVEL_DEFAULT; +#if defined(DEBUGLEVEL) && (DEBUGLEVEL>=1) + params.zParams.notificationLevel = DEBUGLEVEL; +#endif + return ZDICT_optimizeTrainFromBuffer_fastCover(dictBuffer, dictBufferCapacity, + samplesBuffer, samplesSizes, nbSamples, + ¶ms); +} + +size_t ZDICT_addEntropyTablesFromBuffer(void* dictBuffer, size_t dictContentSize, size_t dictBufferCapacity, + const void* samplesBuffer, const size_t* samplesSizes, unsigned nbSamples) +{ + ZDICT_params_t params; + memset(¶ms, 0, sizeof(params)); + return ZDICT_addEntropyTablesFromBuffer_advanced(dictBuffer, dictContentSize, dictBufferCapacity, + samplesBuffer, samplesSizes, nbSamples, + params); +} diff --git a/external/zstd/lib/dll/example/Makefile b/external/zstd/lib/dll/example/Makefile new file mode 100644 index 00000000..03b034dd --- /dev/null +++ b/external/zstd/lib/dll/example/Makefile @@ -0,0 +1,48 @@ +# ################################################################ +# Copyright (c) Yann Collet, Facebook, Inc. +# All rights reserved. +# +# This source code is licensed under both the BSD-style license (found in the +# LICENSE file in the root directory of this source tree) and the GPLv2 (found +# in the COPYING file in the root directory of this source tree). +# You may select, at your option, one of the above-listed licenses. +# ################################################################ + +VOID := /dev/null +ZSTDDIR := ../include +LIBDIR := ../static +DLLDIR := ../dll + +CFLAGS ?= -O3 # can select custom flags. For example : CFLAGS="-O2 -g" make +CFLAGS += -Wall -Wextra -Wundef -Wcast-qual -Wcast-align -Wshadow -Wswitch-enum \ + -Wdeclaration-after-statement -Wstrict-prototypes \ + -Wpointer-arith -Wstrict-aliasing=1 +CFLAGS += $(MOREFLAGS) +CPPFLAGS:= -I$(ZSTDDIR) -DXXH_NAMESPACE=ZSTD_ +FLAGS := $(CFLAGS) $(CPPFLAGS) $(LDFLAGS) + + +# Define *.exe as extension for Windows systems +ifneq (,$(filter Windows%,$(OS))) +EXT =.exe +else +EXT = +endif + +.PHONY: default fullbench-dll fullbench-lib + + +default: all + +all: fullbench-dll fullbench-lib + + +fullbench-lib: fullbench.c datagen.c + $(CC) $(FLAGS) $^ -o $@$(EXT) $(LIBDIR)/libzstd_static.lib + +fullbench-dll: fullbench.c datagen.c + $(CC) $(FLAGS) $^ -o $@$(EXT) -DZSTD_DLL_IMPORT=1 $(DLLDIR)/libzstd.dll + +clean: + @$(RM) fullbench-dll$(EXT) fullbench-lib$(EXT) \ + @echo Cleaning completed diff --git a/external/zstd/lib/dll/example/README.md b/external/zstd/lib/dll/example/README.md new file mode 100644 index 00000000..9e30fd59 --- /dev/null +++ b/external/zstd/lib/dll/example/README.md @@ -0,0 +1,63 @@ +# ZSTD Windows binary package + +## The package contents + +- `zstd.exe` : Command Line Utility, supporting gzip-like arguments +- `dll\libzstd.dll` : The ZSTD dynamic library (DLL) +- `dll\libzstd.lib` : The import library of the ZSTD dynamic library (DLL) for Visual C++ +- `example\` : The example of usage of the ZSTD library +- `include\` : Header files required by the ZSTD library +- `static\libzstd_static.lib` : The static ZSTD library (LIB) + +## Usage of Command Line Interface + +Command Line Interface (CLI) supports gzip-like arguments. +By default CLI takes an input file and compresses it to an output file: + + Usage: zstd [arg] [input] [output] + +The full list of commands for CLI can be obtained with `-h` or `-H`. The ratio can +be improved with commands from `-3` to `-16` but higher levels also have slower +compression. CLI includes in-memory compression benchmark module with compression +levels starting from `-b` and ending with `-e` with iteration time of `-i` seconds. +CLI supports aggregation of parameters i.e. `-b1`, `-e18`, and `-i1` can be joined +into `-b1e18i1`. + +## The example of usage of static and dynamic ZSTD libraries with gcc/MinGW + +Use `cd example` and `make` to build `fullbench-dll` and `fullbench-lib`. +`fullbench-dll` uses a dynamic ZSTD library from the `dll` directory. +`fullbench-lib` uses a static ZSTD library from the `lib` directory. + +## Using ZSTD DLL with gcc/MinGW + +The header files from `include\` and the dynamic library `dll\libzstd.dll` +are required to compile a project using gcc/MinGW. +The dynamic library has to be added to linking options. +It means that if a project that uses ZSTD consists of a single `test-dll.c` +file it should be linked with `dll\libzstd.dll`. For example: + + gcc $(CFLAGS) -Iinclude\ test-dll.c -o test-dll dll\libzstd.dll + +The compiled executable will require ZSTD DLL which is available at `dll\libzstd.dll`. + +## The example of usage of static and dynamic ZSTD libraries with Visual C++ + +Open `example\fullbench-dll.sln` to compile `fullbench-dll` that uses a +dynamic ZSTD library from the `dll` directory. The solution works with Visual C++ +2010 or newer. When one will open the solution with Visual C++ newer than 2010 +then the solution will upgraded to the current version. + +## Using ZSTD DLL with Visual C++ + +The header files from `include\` and the import library `dll\libzstd.lib` +are required to compile a project using Visual C++. + +1. The path to header files should be added to `Additional Include Directories` that can + be found in project properties `C/C++` then `General`. +2. The import library has to be added to `Additional Dependencies` that can + be found in project properties `Linker` then `Input`. + If one will provide only the name `libzstd.lib` without a full path to the library + the directory has to be added to `Linker\General\Additional Library Directories`. + +The compiled executable will require ZSTD DLL which is available at `dll\libzstd.dll`. diff --git a/external/zstd/lib/dll/example/build_package.bat b/external/zstd/lib/dll/example/build_package.bat new file mode 100644 index 00000000..8baabc7b --- /dev/null +++ b/external/zstd/lib/dll/example/build_package.bat @@ -0,0 +1,20 @@ +@ECHO OFF +MKDIR bin\dll bin\static bin\example bin\include +COPY tests\fullbench.c bin\example\ +COPY programs\datagen.c bin\example\ +COPY programs\datagen.h bin\example\ +COPY programs\util.h bin\example\ +COPY programs\platform.h bin\example\ +COPY lib\common\mem.h bin\example\ +COPY lib\common\zstd_internal.h bin\example\ +COPY lib\common\error_private.h bin\example\ +COPY lib\common\xxhash.h bin\example\ +COPY lib\libzstd.a bin\static\libzstd_static.lib +COPY lib\dll\libzstd.* bin\dll\ +COPY lib\dll\example\Makefile bin\example\ +COPY lib\dll\example\fullbench-dll.* bin\example\ +COPY lib\dll\example\README.md bin\ +COPY lib\zstd.h bin\include\ +COPY lib\common\zstd_errors.h bin\include\ +COPY lib\dictBuilder\zdict.h bin\include\ +COPY programs\zstd.exe bin\zstd.exe diff --git a/external/zstd/lib/dll/example/fullbench-dll.sln b/external/zstd/lib/dll/example/fullbench-dll.sln new file mode 100644 index 00000000..72e302e7 --- /dev/null +++ b/external/zstd/lib/dll/example/fullbench-dll.sln @@ -0,0 +1,25 @@ +Microsoft Visual Studio Solution File, Format Version 12.00 +# Visual Studio Express 2012 for Windows Desktop +Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "fullbench-dll", "fullbench-dll.vcxproj", "{13992FD2-077E-4954-B065-A428198201A9}" +EndProject +Global + GlobalSection(SolutionConfigurationPlatforms) = preSolution + Debug|Win32 = Debug|Win32 + Debug|x64 = Debug|x64 + Release|Win32 = Release|Win32 + Release|x64 = Release|x64 + EndGlobalSection + GlobalSection(ProjectConfigurationPlatforms) = postSolution + {13992FD2-077E-4954-B065-A428198201A9}.Debug|Win32.ActiveCfg = Debug|Win32 + {13992FD2-077E-4954-B065-A428198201A9}.Debug|Win32.Build.0 = Debug|Win32 + {13992FD2-077E-4954-B065-A428198201A9}.Debug|x64.ActiveCfg = Debug|x64 + {13992FD2-077E-4954-B065-A428198201A9}.Debug|x64.Build.0 = Debug|x64 + {13992FD2-077E-4954-B065-A428198201A9}.Release|Win32.ActiveCfg = Release|Win32 + {13992FD2-077E-4954-B065-A428198201A9}.Release|Win32.Build.0 = Release|Win32 + {13992FD2-077E-4954-B065-A428198201A9}.Release|x64.ActiveCfg = Release|x64 + {13992FD2-077E-4954-B065-A428198201A9}.Release|x64.Build.0 = Release|x64 + EndGlobalSection + GlobalSection(SolutionProperties) = preSolution + HideSolutionNode = FALSE + EndGlobalSection +EndGlobal diff --git a/external/zstd/lib/dll/example/fullbench-dll.vcxproj b/external/zstd/lib/dll/example/fullbench-dll.vcxproj new file mode 100644 index 00000000..44bbaf78 --- /dev/null +++ b/external/zstd/lib/dll/example/fullbench-dll.vcxproj @@ -0,0 +1,181 @@ + + + + + Debug + Win32 + + + Debug + x64 + + + Release + Win32 + + + Release + x64 + + + + {00000000-1CC8-4FD7-9281-6B8DBB9D3DF8} + Win32Proj + fullbench-dll + $(SolutionDir)bin\$(Platform)_$(Configuration)\ + $(SolutionDir)bin\obj\$(RootNamespace)_$(Platform)_$(Configuration)\ + + + + Application + true + MultiByte + + + Application + true + MultiByte + + + Application + false + true + MultiByte + + + Application + false + true + MultiByte + + + + + + + + + + + + + + + + + + + true + $(IncludePath);$(SolutionDir)..\..\lib;$(SolutionDir)..\..\programs;$(SolutionDir)..\..\lib\legacy;$(SolutionDir)..\..\lib\common;$(UniversalCRT_IncludePath); + false + + + true + $(IncludePath);$(SolutionDir)..\..\lib;$(SolutionDir)..\..\programs;$(SolutionDir)..\..\lib\legacy;$(SolutionDir)..\..\lib\common;$(UniversalCRT_IncludePath); + false + + + false + $(IncludePath);$(SolutionDir)..\..\lib;$(SolutionDir)..\..\programs;$(SolutionDir)..\..\lib\legacy;$(SolutionDir)..\..\lib\common;$(UniversalCRT_IncludePath); + false + + + false + $(IncludePath);$(SolutionDir)..\..\lib;$(SolutionDir)..\..\programs;$(SolutionDir)..\..\lib\legacy;$(SolutionDir)..\..\lib\common;$(UniversalCRT_IncludePath); + false + + + + + + Level4 + Disabled + WIN32;_DEBUG;_CONSOLE;ZSTD_DLL_IMPORT=1;%(PreprocessorDefinitions) + true + false + ..\include + + + Console + true + $(SolutionDir)..\dll;%(AdditionalLibraryDirectories) + libzstd.lib;%(AdditionalDependencies) + false + + + + + + + Level4 + Disabled + WIN32;_DEBUG;_CONSOLE;ZSTD_DLL_IMPORT=1;%(PreprocessorDefinitions) + true + false + ..\include + + + Console + true + $(SolutionDir)..\dll;%(AdditionalLibraryDirectories) + libzstd.lib;%(AdditionalDependencies) + + + + + Level4 + + + MaxSpeed + true + true + WIN32;_DEBUG;_CONSOLE;ZSTD_DLL_IMPORT=1;%(PreprocessorDefinitions) + false + ..\include + false + MultiThreaded + + + Console + true + true + true + $(SolutionDir)..\dll;%(AdditionalLibraryDirectories) + libzstd.lib;%(AdditionalDependencies) + false + + + + + Level4 + + + MaxSpeed + true + true + WIN32;_DEBUG;_CONSOLE;ZSTD_DLL_IMPORT=1;%(PreprocessorDefinitions) + false + false + ..\include + MultiThreaded + + + Console + true + true + true + $(SolutionDir)..\dll;%(AdditionalLibraryDirectories) + libzstd.lib;%(AdditionalDependencies) + + + + + + + + + + + + + \ No newline at end of file diff --git a/external/zstd/lib/legacy/zstd_legacy.h b/external/zstd/lib/legacy/zstd_legacy.h new file mode 100644 index 00000000..a6f1174b --- /dev/null +++ b/external/zstd/lib/legacy/zstd_legacy.h @@ -0,0 +1,415 @@ +/* + * Copyright (c) Yann Collet, Facebook, Inc. + * All rights reserved. + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. + */ + +#ifndef ZSTD_LEGACY_H +#define ZSTD_LEGACY_H + +#if defined (__cplusplus) +extern "C" { +#endif + +/* ************************************* +* Includes +***************************************/ +#include "../common/mem.h" /* MEM_STATIC */ +#include "../common/error_private.h" /* ERROR */ +#include "../common/zstd_internal.h" /* ZSTD_inBuffer, ZSTD_outBuffer, ZSTD_frameSizeInfo */ + +#if !defined (ZSTD_LEGACY_SUPPORT) || (ZSTD_LEGACY_SUPPORT == 0) +# undef ZSTD_LEGACY_SUPPORT +# define ZSTD_LEGACY_SUPPORT 8 +#endif + +#if (ZSTD_LEGACY_SUPPORT <= 1) +# include "zstd_v01.h" +#endif +#if (ZSTD_LEGACY_SUPPORT <= 2) +# include "zstd_v02.h" +#endif +#if (ZSTD_LEGACY_SUPPORT <= 3) +# include "zstd_v03.h" +#endif +#if (ZSTD_LEGACY_SUPPORT <= 4) +# include "zstd_v04.h" +#endif +#if (ZSTD_LEGACY_SUPPORT <= 5) +# include "zstd_v05.h" +#endif +#if (ZSTD_LEGACY_SUPPORT <= 6) +# include "zstd_v06.h" +#endif +#if (ZSTD_LEGACY_SUPPORT <= 7) +# include "zstd_v07.h" +#endif + +/** ZSTD_isLegacy() : + @return : > 0 if supported by legacy decoder. 0 otherwise. + return value is the version. +*/ +MEM_STATIC unsigned ZSTD_isLegacy(const void* src, size_t srcSize) +{ + U32 magicNumberLE; + if (srcSize<4) return 0; + magicNumberLE = MEM_readLE32(src); + switch(magicNumberLE) + { +#if (ZSTD_LEGACY_SUPPORT <= 1) + case ZSTDv01_magicNumberLE:return 1; +#endif +#if (ZSTD_LEGACY_SUPPORT <= 2) + case ZSTDv02_magicNumber : return 2; +#endif +#if (ZSTD_LEGACY_SUPPORT <= 3) + case ZSTDv03_magicNumber : return 3; +#endif +#if (ZSTD_LEGACY_SUPPORT <= 4) + case ZSTDv04_magicNumber : return 4; +#endif +#if (ZSTD_LEGACY_SUPPORT <= 5) + case ZSTDv05_MAGICNUMBER : return 5; +#endif +#if (ZSTD_LEGACY_SUPPORT <= 6) + case ZSTDv06_MAGICNUMBER : return 6; +#endif +#if (ZSTD_LEGACY_SUPPORT <= 7) + case ZSTDv07_MAGICNUMBER : return 7; +#endif + default : return 0; + } +} + + +MEM_STATIC unsigned long long ZSTD_getDecompressedSize_legacy(const void* src, size_t srcSize) +{ + U32 const version = ZSTD_isLegacy(src, srcSize); + if (version < 5) return 0; /* no decompressed size in frame header, or not a legacy format */ +#if (ZSTD_LEGACY_SUPPORT <= 5) + if (version==5) { + ZSTDv05_parameters fParams; + size_t const frResult = ZSTDv05_getFrameParams(&fParams, src, srcSize); + if (frResult != 0) return 0; + return fParams.srcSize; + } +#endif +#if (ZSTD_LEGACY_SUPPORT <= 6) + if (version==6) { + ZSTDv06_frameParams fParams; + size_t const frResult = ZSTDv06_getFrameParams(&fParams, src, srcSize); + if (frResult != 0) return 0; + return fParams.frameContentSize; + } +#endif +#if (ZSTD_LEGACY_SUPPORT <= 7) + if (version==7) { + ZSTDv07_frameParams fParams; + size_t const frResult = ZSTDv07_getFrameParams(&fParams, src, srcSize); + if (frResult != 0) return 0; + return fParams.frameContentSize; + } +#endif + return 0; /* should not be possible */ +} + + +MEM_STATIC size_t ZSTD_decompressLegacy( + void* dst, size_t dstCapacity, + const void* src, size_t compressedSize, + const void* dict,size_t dictSize) +{ + U32 const version = ZSTD_isLegacy(src, compressedSize); + (void)dst; (void)dstCapacity; (void)dict; (void)dictSize; /* unused when ZSTD_LEGACY_SUPPORT >= 8 */ + switch(version) + { +#if (ZSTD_LEGACY_SUPPORT <= 1) + case 1 : + return ZSTDv01_decompress(dst, dstCapacity, src, compressedSize); +#endif +#if (ZSTD_LEGACY_SUPPORT <= 2) + case 2 : + return ZSTDv02_decompress(dst, dstCapacity, src, compressedSize); +#endif +#if (ZSTD_LEGACY_SUPPORT <= 3) + case 3 : + return ZSTDv03_decompress(dst, dstCapacity, src, compressedSize); +#endif +#if (ZSTD_LEGACY_SUPPORT <= 4) + case 4 : + return ZSTDv04_decompress(dst, dstCapacity, src, compressedSize); +#endif +#if (ZSTD_LEGACY_SUPPORT <= 5) + case 5 : + { size_t result; + ZSTDv05_DCtx* const zd = ZSTDv05_createDCtx(); + if (zd==NULL) return ERROR(memory_allocation); + result = ZSTDv05_decompress_usingDict(zd, dst, dstCapacity, src, compressedSize, dict, dictSize); + ZSTDv05_freeDCtx(zd); + return result; + } +#endif +#if (ZSTD_LEGACY_SUPPORT <= 6) + case 6 : + { size_t result; + ZSTDv06_DCtx* const zd = ZSTDv06_createDCtx(); + if (zd==NULL) return ERROR(memory_allocation); + result = ZSTDv06_decompress_usingDict(zd, dst, dstCapacity, src, compressedSize, dict, dictSize); + ZSTDv06_freeDCtx(zd); + return result; + } +#endif +#if (ZSTD_LEGACY_SUPPORT <= 7) + case 7 : + { size_t result; + ZSTDv07_DCtx* const zd = ZSTDv07_createDCtx(); + if (zd==NULL) return ERROR(memory_allocation); + result = ZSTDv07_decompress_usingDict(zd, dst, dstCapacity, src, compressedSize, dict, dictSize); + ZSTDv07_freeDCtx(zd); + return result; + } +#endif + default : + return ERROR(prefix_unknown); + } +} + +MEM_STATIC ZSTD_frameSizeInfo ZSTD_findFrameSizeInfoLegacy(const void *src, size_t srcSize) +{ + ZSTD_frameSizeInfo frameSizeInfo; + U32 const version = ZSTD_isLegacy(src, srcSize); + switch(version) + { +#if (ZSTD_LEGACY_SUPPORT <= 1) + case 1 : + ZSTDv01_findFrameSizeInfoLegacy(src, srcSize, + &frameSizeInfo.compressedSize, + &frameSizeInfo.decompressedBound); + break; +#endif +#if (ZSTD_LEGACY_SUPPORT <= 2) + case 2 : + ZSTDv02_findFrameSizeInfoLegacy(src, srcSize, + &frameSizeInfo.compressedSize, + &frameSizeInfo.decompressedBound); + break; +#endif +#if (ZSTD_LEGACY_SUPPORT <= 3) + case 3 : + ZSTDv03_findFrameSizeInfoLegacy(src, srcSize, + &frameSizeInfo.compressedSize, + &frameSizeInfo.decompressedBound); + break; +#endif +#if (ZSTD_LEGACY_SUPPORT <= 4) + case 4 : + ZSTDv04_findFrameSizeInfoLegacy(src, srcSize, + &frameSizeInfo.compressedSize, + &frameSizeInfo.decompressedBound); + break; +#endif +#if (ZSTD_LEGACY_SUPPORT <= 5) + case 5 : + ZSTDv05_findFrameSizeInfoLegacy(src, srcSize, + &frameSizeInfo.compressedSize, + &frameSizeInfo.decompressedBound); + break; +#endif +#if (ZSTD_LEGACY_SUPPORT <= 6) + case 6 : + ZSTDv06_findFrameSizeInfoLegacy(src, srcSize, + &frameSizeInfo.compressedSize, + &frameSizeInfo.decompressedBound); + break; +#endif +#if (ZSTD_LEGACY_SUPPORT <= 7) + case 7 : + ZSTDv07_findFrameSizeInfoLegacy(src, srcSize, + &frameSizeInfo.compressedSize, + &frameSizeInfo.decompressedBound); + break; +#endif + default : + frameSizeInfo.compressedSize = ERROR(prefix_unknown); + frameSizeInfo.decompressedBound = ZSTD_CONTENTSIZE_ERROR; + break; + } + if (!ZSTD_isError(frameSizeInfo.compressedSize) && frameSizeInfo.compressedSize > srcSize) { + frameSizeInfo.compressedSize = ERROR(srcSize_wrong); + frameSizeInfo.decompressedBound = ZSTD_CONTENTSIZE_ERROR; + } + return frameSizeInfo; +} + +MEM_STATIC size_t ZSTD_findFrameCompressedSizeLegacy(const void *src, size_t srcSize) +{ + ZSTD_frameSizeInfo frameSizeInfo = ZSTD_findFrameSizeInfoLegacy(src, srcSize); + return frameSizeInfo.compressedSize; +} + +MEM_STATIC size_t ZSTD_freeLegacyStreamContext(void* legacyContext, U32 version) +{ + switch(version) + { + default : + case 1 : + case 2 : + case 3 : + (void)legacyContext; + return ERROR(version_unsupported); +#if (ZSTD_LEGACY_SUPPORT <= 4) + case 4 : return ZBUFFv04_freeDCtx((ZBUFFv04_DCtx*)legacyContext); +#endif +#if (ZSTD_LEGACY_SUPPORT <= 5) + case 5 : return ZBUFFv05_freeDCtx((ZBUFFv05_DCtx*)legacyContext); +#endif +#if (ZSTD_LEGACY_SUPPORT <= 6) + case 6 : return ZBUFFv06_freeDCtx((ZBUFFv06_DCtx*)legacyContext); +#endif +#if (ZSTD_LEGACY_SUPPORT <= 7) + case 7 : return ZBUFFv07_freeDCtx((ZBUFFv07_DCtx*)legacyContext); +#endif + } +} + + +MEM_STATIC size_t ZSTD_initLegacyStream(void** legacyContext, U32 prevVersion, U32 newVersion, + const void* dict, size_t dictSize) +{ + DEBUGLOG(5, "ZSTD_initLegacyStream for v0.%u", newVersion); + if (prevVersion != newVersion) ZSTD_freeLegacyStreamContext(*legacyContext, prevVersion); + switch(newVersion) + { + default : + case 1 : + case 2 : + case 3 : + (void)dict; (void)dictSize; + return 0; +#if (ZSTD_LEGACY_SUPPORT <= 4) + case 4 : + { + ZBUFFv04_DCtx* dctx = (prevVersion != newVersion) ? ZBUFFv04_createDCtx() : (ZBUFFv04_DCtx*)*legacyContext; + if (dctx==NULL) return ERROR(memory_allocation); + ZBUFFv04_decompressInit(dctx); + ZBUFFv04_decompressWithDictionary(dctx, dict, dictSize); + *legacyContext = dctx; + return 0; + } +#endif +#if (ZSTD_LEGACY_SUPPORT <= 5) + case 5 : + { + ZBUFFv05_DCtx* dctx = (prevVersion != newVersion) ? ZBUFFv05_createDCtx() : (ZBUFFv05_DCtx*)*legacyContext; + if (dctx==NULL) return ERROR(memory_allocation); + ZBUFFv05_decompressInitDictionary(dctx, dict, dictSize); + *legacyContext = dctx; + return 0; + } +#endif +#if (ZSTD_LEGACY_SUPPORT <= 6) + case 6 : + { + ZBUFFv06_DCtx* dctx = (prevVersion != newVersion) ? ZBUFFv06_createDCtx() : (ZBUFFv06_DCtx*)*legacyContext; + if (dctx==NULL) return ERROR(memory_allocation); + ZBUFFv06_decompressInitDictionary(dctx, dict, dictSize); + *legacyContext = dctx; + return 0; + } +#endif +#if (ZSTD_LEGACY_SUPPORT <= 7) + case 7 : + { + ZBUFFv07_DCtx* dctx = (prevVersion != newVersion) ? ZBUFFv07_createDCtx() : (ZBUFFv07_DCtx*)*legacyContext; + if (dctx==NULL) return ERROR(memory_allocation); + ZBUFFv07_decompressInitDictionary(dctx, dict, dictSize); + *legacyContext = dctx; + return 0; + } +#endif + } +} + + + +MEM_STATIC size_t ZSTD_decompressLegacyStream(void* legacyContext, U32 version, + ZSTD_outBuffer* output, ZSTD_inBuffer* input) +{ + DEBUGLOG(5, "ZSTD_decompressLegacyStream for v0.%u", version); + switch(version) + { + default : + case 1 : + case 2 : + case 3 : + (void)legacyContext; (void)output; (void)input; + return ERROR(version_unsupported); +#if (ZSTD_LEGACY_SUPPORT <= 4) + case 4 : + { + ZBUFFv04_DCtx* dctx = (ZBUFFv04_DCtx*) legacyContext; + const void* src = (const char*)input->src + input->pos; + size_t readSize = input->size - input->pos; + void* dst = (char*)output->dst + output->pos; + size_t decodedSize = output->size - output->pos; + size_t const hintSize = ZBUFFv04_decompressContinue(dctx, dst, &decodedSize, src, &readSize); + output->pos += decodedSize; + input->pos += readSize; + return hintSize; + } +#endif +#if (ZSTD_LEGACY_SUPPORT <= 5) + case 5 : + { + ZBUFFv05_DCtx* dctx = (ZBUFFv05_DCtx*) legacyContext; + const void* src = (const char*)input->src + input->pos; + size_t readSize = input->size - input->pos; + void* dst = (char*)output->dst + output->pos; + size_t decodedSize = output->size - output->pos; + size_t const hintSize = ZBUFFv05_decompressContinue(dctx, dst, &decodedSize, src, &readSize); + output->pos += decodedSize; + input->pos += readSize; + return hintSize; + } +#endif +#if (ZSTD_LEGACY_SUPPORT <= 6) + case 6 : + { + ZBUFFv06_DCtx* dctx = (ZBUFFv06_DCtx*) legacyContext; + const void* src = (const char*)input->src + input->pos; + size_t readSize = input->size - input->pos; + void* dst = (char*)output->dst + output->pos; + size_t decodedSize = output->size - output->pos; + size_t const hintSize = ZBUFFv06_decompressContinue(dctx, dst, &decodedSize, src, &readSize); + output->pos += decodedSize; + input->pos += readSize; + return hintSize; + } +#endif +#if (ZSTD_LEGACY_SUPPORT <= 7) + case 7 : + { + ZBUFFv07_DCtx* dctx = (ZBUFFv07_DCtx*) legacyContext; + const void* src = (const char*)input->src + input->pos; + size_t readSize = input->size - input->pos; + void* dst = (char*)output->dst + output->pos; + size_t decodedSize = output->size - output->pos; + size_t const hintSize = ZBUFFv07_decompressContinue(dctx, dst, &decodedSize, src, &readSize); + output->pos += decodedSize; + input->pos += readSize; + return hintSize; + } +#endif + } +} + + +#if defined (__cplusplus) +} +#endif + +#endif /* ZSTD_LEGACY_H */ diff --git a/external/zstd/lib/legacy/zstd_v01.c b/external/zstd/lib/legacy/zstd_v01.c new file mode 100644 index 00000000..7ab55479 --- /dev/null +++ b/external/zstd/lib/legacy/zstd_v01.c @@ -0,0 +1,2162 @@ +/* + * Copyright (c) Yann Collet, Facebook, Inc. + * All rights reserved. + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. + */ + + +/****************************************** +* Includes +******************************************/ +#include /* size_t, ptrdiff_t */ +#include "zstd_v01.h" +#include "../common/error_private.h" + + +/****************************************** +* Static allocation +******************************************/ +/* You can statically allocate FSE CTable/DTable as a table of unsigned using below macro */ +#define FSE_DTABLE_SIZE_U32(maxTableLog) (1 + (1<2^N Bytes (examples : 10 -> 1KB; 12 -> 4KB ; 16 -> 64KB; 20 -> 1MB; etc.) +* Increasing memory usage improves compression ratio +* Reduced memory usage can improve speed, due to cache effect +* Recommended max value is 14, for 16KB, which nicely fits into Intel x86 L1 cache */ +#define FSE_MAX_MEMORY_USAGE 14 +#define FSE_DEFAULT_MEMORY_USAGE 13 + +/* FSE_MAX_SYMBOL_VALUE : +* Maximum symbol value authorized. +* Required for proper stack allocation */ +#define FSE_MAX_SYMBOL_VALUE 255 + + +/**************************************************************** +* template functions type & suffix +****************************************************************/ +#define FSE_FUNCTION_TYPE BYTE +#define FSE_FUNCTION_EXTENSION + + +/**************************************************************** +* Byte symbol type +****************************************************************/ +typedef struct +{ + unsigned short newState; + unsigned char symbol; + unsigned char nbBits; +} FSE_decode_t; /* size == U32 */ + + + +/**************************************************************** +* Compiler specifics +****************************************************************/ +#ifdef _MSC_VER /* Visual Studio */ +# define FORCE_INLINE static __forceinline +# include /* For Visual 2005 */ +# pragma warning(disable : 4127) /* disable: C4127: conditional expression is constant */ +# pragma warning(disable : 4214) /* disable: C4214: non-int bitfields */ +#else +# define GCC_VERSION (__GNUC__ * 100 + __GNUC_MINOR__) +# if defined (__cplusplus) || defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L /* C99 */ +# ifdef __GNUC__ +# define FORCE_INLINE static inline __attribute__((always_inline)) +# else +# define FORCE_INLINE static inline +# endif +# else +# define FORCE_INLINE static +# endif /* __STDC_VERSION__ */ +#endif + + +/**************************************************************** +* Includes +****************************************************************/ +#include /* malloc, free, qsort */ +#include /* memcpy, memset */ +#include /* printf (debug) */ + + +#ifndef MEM_ACCESS_MODULE +#define MEM_ACCESS_MODULE +/**************************************************************** +* Basic Types +*****************************************************************/ +#if defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L /* C99 */ +# include +typedef uint8_t BYTE; +typedef uint16_t U16; +typedef int16_t S16; +typedef uint32_t U32; +typedef int32_t S32; +typedef uint64_t U64; +typedef int64_t S64; +#else +typedef unsigned char BYTE; +typedef unsigned short U16; +typedef signed short S16; +typedef unsigned int U32; +typedef signed int S32; +typedef unsigned long long U64; +typedef signed long long S64; +#endif + +#endif /* MEM_ACCESS_MODULE */ + +/**************************************************************** +* Memory I/O +*****************************************************************/ +/* FSE_FORCE_MEMORY_ACCESS + * By default, access to unaligned memory is controlled by `memcpy()`, which is safe and portable. + * Unfortunately, on some target/compiler combinations, the generated assembly is sub-optimal. + * The below switch allow to select different access method for improved performance. + * Method 0 (default) : use `memcpy()`. Safe and portable. + * Method 1 : `__packed` statement. It depends on compiler extension (ie, not portable). + * This method is safe if your compiler supports it, and *generally* as fast or faster than `memcpy`. + * Method 2 : direct access. This method is portable but violate C standard. + * It can generate buggy code on targets generating assembly depending on alignment. + * But in some circumstances, it's the only known way to get the most performance (ie GCC + ARMv6) + * See http://fastcompression.blogspot.fr/2015/08/accessing-unaligned-memory.html for details. + * Prefer these methods in priority order (0 > 1 > 2) + */ +#ifndef FSE_FORCE_MEMORY_ACCESS /* can be defined externally, on command line for example */ +# if defined(__GNUC__) && ( defined(__ARM_ARCH_6__) || defined(__ARM_ARCH_6J__) || defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6Z__) || defined(__ARM_ARCH_6ZK__) || defined(__ARM_ARCH_6T2__) ) +# define FSE_FORCE_MEMORY_ACCESS 2 +# elif (defined(__INTEL_COMPILER) && !defined(WIN32)) || \ + (defined(__GNUC__) && ( defined(__ARM_ARCH_7__) || defined(__ARM_ARCH_7A__) || defined(__ARM_ARCH_7R__) || defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7S__) )) +# define FSE_FORCE_MEMORY_ACCESS 1 +# endif +#endif + + +static unsigned FSE_32bits(void) +{ + return sizeof(void*)==4; +} + +static unsigned FSE_isLittleEndian(void) +{ + const union { U32 i; BYTE c[4]; } one = { 1 }; /* don't use static : performance detrimental */ + return one.c[0]; +} + +#if defined(FSE_FORCE_MEMORY_ACCESS) && (FSE_FORCE_MEMORY_ACCESS==2) + +static U16 FSE_read16(const void* memPtr) { return *(const U16*) memPtr; } +static U32 FSE_read32(const void* memPtr) { return *(const U32*) memPtr; } +static U64 FSE_read64(const void* memPtr) { return *(const U64*) memPtr; } + +#elif defined(FSE_FORCE_MEMORY_ACCESS) && (FSE_FORCE_MEMORY_ACCESS==1) + +/* __pack instructions are safer, but compiler specific, hence potentially problematic for some compilers */ +/* currently only defined for gcc and icc */ +typedef union { U16 u16; U32 u32; U64 u64; } __attribute__((packed)) unalign; + +static U16 FSE_read16(const void* ptr) { return ((const unalign*)ptr)->u16; } +static U32 FSE_read32(const void* ptr) { return ((const unalign*)ptr)->u32; } +static U64 FSE_read64(const void* ptr) { return ((const unalign*)ptr)->u64; } + +#else + +static U16 FSE_read16(const void* memPtr) +{ + U16 val; memcpy(&val, memPtr, sizeof(val)); return val; +} + +static U32 FSE_read32(const void* memPtr) +{ + U32 val; memcpy(&val, memPtr, sizeof(val)); return val; +} + +static U64 FSE_read64(const void* memPtr) +{ + U64 val; memcpy(&val, memPtr, sizeof(val)); return val; +} + +#endif /* FSE_FORCE_MEMORY_ACCESS */ + +static U16 FSE_readLE16(const void* memPtr) +{ + if (FSE_isLittleEndian()) + return FSE_read16(memPtr); + else + { + const BYTE* p = (const BYTE*)memPtr; + return (U16)(p[0] + (p[1]<<8)); + } +} + +static U32 FSE_readLE32(const void* memPtr) +{ + if (FSE_isLittleEndian()) + return FSE_read32(memPtr); + else + { + const BYTE* p = (const BYTE*)memPtr; + return (U32)((U32)p[0] + ((U32)p[1]<<8) + ((U32)p[2]<<16) + ((U32)p[3]<<24)); + } +} + + +static U64 FSE_readLE64(const void* memPtr) +{ + if (FSE_isLittleEndian()) + return FSE_read64(memPtr); + else + { + const BYTE* p = (const BYTE*)memPtr; + return (U64)((U64)p[0] + ((U64)p[1]<<8) + ((U64)p[2]<<16) + ((U64)p[3]<<24) + + ((U64)p[4]<<32) + ((U64)p[5]<<40) + ((U64)p[6]<<48) + ((U64)p[7]<<56)); + } +} + +static size_t FSE_readLEST(const void* memPtr) +{ + if (FSE_32bits()) + return (size_t)FSE_readLE32(memPtr); + else + return (size_t)FSE_readLE64(memPtr); +} + + + +/**************************************************************** +* Constants +*****************************************************************/ +#define FSE_MAX_TABLELOG (FSE_MAX_MEMORY_USAGE-2) +#define FSE_MAX_TABLESIZE (1U< FSE_TABLELOG_ABSOLUTE_MAX +#error "FSE_MAX_TABLELOG > FSE_TABLELOG_ABSOLUTE_MAX is not supported" +#endif + + +/**************************************************************** +* Error Management +****************************************************************/ +#define FSE_STATIC_ASSERT(c) { enum { FSE_static_assert = 1/(int)(!!(c)) }; } /* use only *after* variable declarations */ + + +/**************************************************************** +* Complex types +****************************************************************/ +typedef struct +{ + int deltaFindState; + U32 deltaNbBits; +} FSE_symbolCompressionTransform; /* total 8 bytes */ + +typedef U32 DTable_max_t[FSE_DTABLE_SIZE_U32(FSE_MAX_TABLELOG)]; + +/**************************************************************** +* Internal functions +****************************************************************/ +FORCE_INLINE unsigned FSE_highbit32 (U32 val) +{ +# if defined(_MSC_VER) /* Visual */ + unsigned long r; + _BitScanReverse ( &r, val ); + return (unsigned) r; +# elif defined(__GNUC__) && (GCC_VERSION >= 304) /* GCC Intrinsic */ + return __builtin_clz (val) ^ 31; +# else /* Software version */ + static const unsigned DeBruijnClz[32] = { 0, 9, 1, 10, 13, 21, 2, 29, 11, 14, 16, 18, 22, 25, 3, 30, 8, 12, 20, 28, 15, 17, 24, 7, 19, 27, 23, 6, 26, 5, 4, 31 }; + U32 v = val; + unsigned r; + v |= v >> 1; + v |= v >> 2; + v |= v >> 4; + v |= v >> 8; + v |= v >> 16; + r = DeBruijnClz[ (U32) (v * 0x07C4ACDDU) >> 27]; + return r; +# endif +} + + +/**************************************************************** +* Templates +****************************************************************/ +/* + designed to be included + for type-specific functions (template emulation in C) + Objective is to write these functions only once, for improved maintenance +*/ + +/* safety checks */ +#ifndef FSE_FUNCTION_EXTENSION +# error "FSE_FUNCTION_EXTENSION must be defined" +#endif +#ifndef FSE_FUNCTION_TYPE +# error "FSE_FUNCTION_TYPE must be defined" +#endif + +/* Function names */ +#define FSE_CAT(X,Y) X##Y +#define FSE_FUNCTION_NAME(X,Y) FSE_CAT(X,Y) +#define FSE_TYPE_NAME(X,Y) FSE_CAT(X,Y) + + + +static U32 FSE_tableStep(U32 tableSize) { return (tableSize>>1) + (tableSize>>3) + 3; } + +#define FSE_DECODE_TYPE FSE_decode_t + + +typedef struct { + U16 tableLog; + U16 fastMode; +} FSE_DTableHeader; /* sizeof U32 */ + +static size_t FSE_buildDTable +(FSE_DTable* dt, const short* normalizedCounter, unsigned maxSymbolValue, unsigned tableLog) +{ + void* ptr = dt; + FSE_DTableHeader* const DTableH = (FSE_DTableHeader*)ptr; + FSE_DECODE_TYPE* const tableDecode = (FSE_DECODE_TYPE*)(ptr) + 1; /* because dt is unsigned, 32-bits aligned on 32-bits */ + const U32 tableSize = 1 << tableLog; + const U32 tableMask = tableSize-1; + const U32 step = FSE_tableStep(tableSize); + U16 symbolNext[FSE_MAX_SYMBOL_VALUE+1]; + U32 position = 0; + U32 highThreshold = tableSize-1; + const S16 largeLimit= (S16)(1 << (tableLog-1)); + U32 noLarge = 1; + U32 s; + + /* Sanity Checks */ + if (maxSymbolValue > FSE_MAX_SYMBOL_VALUE) return (size_t)-FSE_ERROR_maxSymbolValue_tooLarge; + if (tableLog > FSE_MAX_TABLELOG) return (size_t)-FSE_ERROR_tableLog_tooLarge; + + /* Init, lay down lowprob symbols */ + DTableH[0].tableLog = (U16)tableLog; + for (s=0; s<=maxSymbolValue; s++) + { + if (normalizedCounter[s]==-1) + { + tableDecode[highThreshold--].symbol = (FSE_FUNCTION_TYPE)s; + symbolNext[s] = 1; + } + else + { + if (normalizedCounter[s] >= largeLimit) noLarge=0; + symbolNext[s] = normalizedCounter[s]; + } + } + + /* Spread symbols */ + for (s=0; s<=maxSymbolValue; s++) + { + int i; + for (i=0; i highThreshold) position = (position + step) & tableMask; /* lowprob area */ + } + } + + if (position!=0) return (size_t)-FSE_ERROR_GENERIC; /* position must reach all cells once, otherwise normalizedCounter is incorrect */ + + /* Build Decoding table */ + { + U32 i; + for (i=0; ifastMode = (U16)noLarge; + return 0; +} + + +/****************************************** +* FSE byte symbol +******************************************/ +#ifndef FSE_COMMONDEFS_ONLY + +static unsigned FSE_isError(size_t code) { return (code > (size_t)(-FSE_ERROR_maxCode)); } + +static short FSE_abs(short a) +{ + return a<0? -a : a; +} + + +/**************************************************************** +* Header bitstream management +****************************************************************/ +static size_t FSE_readNCount (short* normalizedCounter, unsigned* maxSVPtr, unsigned* tableLogPtr, + const void* headerBuffer, size_t hbSize) +{ + const BYTE* const istart = (const BYTE*) headerBuffer; + const BYTE* const iend = istart + hbSize; + const BYTE* ip = istart; + int nbBits; + int remaining; + int threshold; + U32 bitStream; + int bitCount; + unsigned charnum = 0; + int previous0 = 0; + + if (hbSize < 4) return (size_t)-FSE_ERROR_srcSize_wrong; + bitStream = FSE_readLE32(ip); + nbBits = (bitStream & 0xF) + FSE_MIN_TABLELOG; /* extract tableLog */ + if (nbBits > FSE_TABLELOG_ABSOLUTE_MAX) return (size_t)-FSE_ERROR_tableLog_tooLarge; + bitStream >>= 4; + bitCount = 4; + *tableLogPtr = nbBits; + remaining = (1<1) && (charnum<=*maxSVPtr)) + { + if (previous0) + { + unsigned n0 = charnum; + while ((bitStream & 0xFFFF) == 0xFFFF) + { + n0+=24; + if (ip < iend-5) + { + ip+=2; + bitStream = FSE_readLE32(ip) >> bitCount; + } + else + { + bitStream >>= 16; + bitCount+=16; + } + } + while ((bitStream & 3) == 3) + { + n0+=3; + bitStream>>=2; + bitCount+=2; + } + n0 += bitStream & 3; + bitCount += 2; + if (n0 > *maxSVPtr) return (size_t)-FSE_ERROR_maxSymbolValue_tooSmall; + while (charnum < n0) normalizedCounter[charnum++] = 0; + if ((ip <= iend-7) || (ip + (bitCount>>3) <= iend-4)) + { + ip += bitCount>>3; + bitCount &= 7; + bitStream = FSE_readLE32(ip) >> bitCount; + } + else + bitStream >>= 2; + } + { + const short max = (short)((2*threshold-1)-remaining); + short count; + + if ((bitStream & (threshold-1)) < (U32)max) + { + count = (short)(bitStream & (threshold-1)); + bitCount += nbBits-1; + } + else + { + count = (short)(bitStream & (2*threshold-1)); + if (count >= threshold) count -= max; + bitCount += nbBits; + } + + count--; /* extra accuracy */ + remaining -= FSE_abs(count); + normalizedCounter[charnum++] = count; + previous0 = !count; + while (remaining < threshold) + { + nbBits--; + threshold >>= 1; + } + + { + if ((ip <= iend-7) || (ip + (bitCount>>3) <= iend-4)) + { + ip += bitCount>>3; + bitCount &= 7; + } + else + { + bitCount -= (int)(8 * (iend - 4 - ip)); + ip = iend - 4; + } + bitStream = FSE_readLE32(ip) >> (bitCount & 31); + } + } + } + if (remaining != 1) return (size_t)-FSE_ERROR_GENERIC; + *maxSVPtr = charnum-1; + + ip += (bitCount+7)>>3; + if ((size_t)(ip-istart) > hbSize) return (size_t)-FSE_ERROR_srcSize_wrong; + return ip-istart; +} + + +/********************************************************* +* Decompression (Byte symbols) +*********************************************************/ +static size_t FSE_buildDTable_rle (FSE_DTable* dt, BYTE symbolValue) +{ + void* ptr = dt; + FSE_DTableHeader* const DTableH = (FSE_DTableHeader*)ptr; + FSE_decode_t* const cell = (FSE_decode_t*)(ptr) + 1; /* because dt is unsigned */ + + DTableH->tableLog = 0; + DTableH->fastMode = 0; + + cell->newState = 0; + cell->symbol = symbolValue; + cell->nbBits = 0; + + return 0; +} + + +static size_t FSE_buildDTable_raw (FSE_DTable* dt, unsigned nbBits) +{ + void* ptr = dt; + FSE_DTableHeader* const DTableH = (FSE_DTableHeader*)ptr; + FSE_decode_t* const dinfo = (FSE_decode_t*)(ptr) + 1; /* because dt is unsigned */ + const unsigned tableSize = 1 << nbBits; + const unsigned tableMask = tableSize - 1; + const unsigned maxSymbolValue = tableMask; + unsigned s; + + /* Sanity checks */ + if (nbBits < 1) return (size_t)-FSE_ERROR_GENERIC; /* min size */ + + /* Build Decoding Table */ + DTableH->tableLog = (U16)nbBits; + DTableH->fastMode = 1; + for (s=0; s<=maxSymbolValue; s++) + { + dinfo[s].newState = 0; + dinfo[s].symbol = (BYTE)s; + dinfo[s].nbBits = (BYTE)nbBits; + } + + return 0; +} + + +/* FSE_initDStream + * Initialize a FSE_DStream_t. + * srcBuffer must point at the beginning of an FSE block. + * The function result is the size of the FSE_block (== srcSize). + * If srcSize is too small, the function will return an errorCode; + */ +static size_t FSE_initDStream(FSE_DStream_t* bitD, const void* srcBuffer, size_t srcSize) +{ + if (srcSize < 1) return (size_t)-FSE_ERROR_srcSize_wrong; + + if (srcSize >= sizeof(size_t)) + { + U32 contain32; + bitD->start = (const char*)srcBuffer; + bitD->ptr = (const char*)srcBuffer + srcSize - sizeof(size_t); + bitD->bitContainer = FSE_readLEST(bitD->ptr); + contain32 = ((const BYTE*)srcBuffer)[srcSize-1]; + if (contain32 == 0) return (size_t)-FSE_ERROR_GENERIC; /* stop bit not present */ + bitD->bitsConsumed = 8 - FSE_highbit32(contain32); + } + else + { + U32 contain32; + bitD->start = (const char*)srcBuffer; + bitD->ptr = bitD->start; + bitD->bitContainer = *(const BYTE*)(bitD->start); + switch(srcSize) + { + case 7: bitD->bitContainer += (size_t)(((const BYTE*)(bitD->start))[6]) << (sizeof(size_t)*8 - 16); + /* fallthrough */ + case 6: bitD->bitContainer += (size_t)(((const BYTE*)(bitD->start))[5]) << (sizeof(size_t)*8 - 24); + /* fallthrough */ + case 5: bitD->bitContainer += (size_t)(((const BYTE*)(bitD->start))[4]) << (sizeof(size_t)*8 - 32); + /* fallthrough */ + case 4: bitD->bitContainer += (size_t)(((const BYTE*)(bitD->start))[3]) << 24; + /* fallthrough */ + case 3: bitD->bitContainer += (size_t)(((const BYTE*)(bitD->start))[2]) << 16; + /* fallthrough */ + case 2: bitD->bitContainer += (size_t)(((const BYTE*)(bitD->start))[1]) << 8; + /* fallthrough */ + default:; + } + contain32 = ((const BYTE*)srcBuffer)[srcSize-1]; + if (contain32 == 0) return (size_t)-FSE_ERROR_GENERIC; /* stop bit not present */ + bitD->bitsConsumed = 8 - FSE_highbit32(contain32); + bitD->bitsConsumed += (U32)(sizeof(size_t) - srcSize)*8; + } + + return srcSize; +} + + +/*!FSE_lookBits + * Provides next n bits from the bitContainer. + * bitContainer is not modified (bits are still present for next read/look) + * On 32-bits, maxNbBits==25 + * On 64-bits, maxNbBits==57 + * return : value extracted. + */ +static size_t FSE_lookBits(FSE_DStream_t* bitD, U32 nbBits) +{ + const U32 bitMask = sizeof(bitD->bitContainer)*8 - 1; + return ((bitD->bitContainer << (bitD->bitsConsumed & bitMask)) >> 1) >> ((bitMask-nbBits) & bitMask); +} + +static size_t FSE_lookBitsFast(FSE_DStream_t* bitD, U32 nbBits) /* only if nbBits >= 1 !! */ +{ + const U32 bitMask = sizeof(bitD->bitContainer)*8 - 1; + return (bitD->bitContainer << (bitD->bitsConsumed & bitMask)) >> (((bitMask+1)-nbBits) & bitMask); +} + +static void FSE_skipBits(FSE_DStream_t* bitD, U32 nbBits) +{ + bitD->bitsConsumed += nbBits; +} + + +/*!FSE_readBits + * Read next n bits from the bitContainer. + * On 32-bits, don't read more than maxNbBits==25 + * On 64-bits, don't read more than maxNbBits==57 + * Use the fast variant *only* if n >= 1. + * return : value extracted. + */ +static size_t FSE_readBits(FSE_DStream_t* bitD, U32 nbBits) +{ + size_t value = FSE_lookBits(bitD, nbBits); + FSE_skipBits(bitD, nbBits); + return value; +} + +static size_t FSE_readBitsFast(FSE_DStream_t* bitD, U32 nbBits) /* only if nbBits >= 1 !! */ +{ + size_t value = FSE_lookBitsFast(bitD, nbBits); + FSE_skipBits(bitD, nbBits); + return value; +} + +static unsigned FSE_reloadDStream(FSE_DStream_t* bitD) +{ + if (bitD->bitsConsumed > (sizeof(bitD->bitContainer)*8)) /* should never happen */ + return FSE_DStream_tooFar; + + if (bitD->ptr >= bitD->start + sizeof(bitD->bitContainer)) + { + bitD->ptr -= bitD->bitsConsumed >> 3; + bitD->bitsConsumed &= 7; + bitD->bitContainer = FSE_readLEST(bitD->ptr); + return FSE_DStream_unfinished; + } + if (bitD->ptr == bitD->start) + { + if (bitD->bitsConsumed < sizeof(bitD->bitContainer)*8) return FSE_DStream_endOfBuffer; + return FSE_DStream_completed; + } + { + U32 nbBytes = bitD->bitsConsumed >> 3; + U32 result = FSE_DStream_unfinished; + if (bitD->ptr - nbBytes < bitD->start) + { + nbBytes = (U32)(bitD->ptr - bitD->start); /* ptr > start */ + result = FSE_DStream_endOfBuffer; + } + bitD->ptr -= nbBytes; + bitD->bitsConsumed -= nbBytes*8; + bitD->bitContainer = FSE_readLEST(bitD->ptr); /* reminder : srcSize > sizeof(bitD) */ + return result; + } +} + + +static void FSE_initDState(FSE_DState_t* DStatePtr, FSE_DStream_t* bitD, const FSE_DTable* dt) +{ + const void* ptr = dt; + const FSE_DTableHeader* const DTableH = (const FSE_DTableHeader*)ptr; + DStatePtr->state = FSE_readBits(bitD, DTableH->tableLog); + FSE_reloadDStream(bitD); + DStatePtr->table = dt + 1; +} + +static BYTE FSE_decodeSymbol(FSE_DState_t* DStatePtr, FSE_DStream_t* bitD) +{ + const FSE_decode_t DInfo = ((const FSE_decode_t*)(DStatePtr->table))[DStatePtr->state]; + const U32 nbBits = DInfo.nbBits; + BYTE symbol = DInfo.symbol; + size_t lowBits = FSE_readBits(bitD, nbBits); + + DStatePtr->state = DInfo.newState + lowBits; + return symbol; +} + +static BYTE FSE_decodeSymbolFast(FSE_DState_t* DStatePtr, FSE_DStream_t* bitD) +{ + const FSE_decode_t DInfo = ((const FSE_decode_t*)(DStatePtr->table))[DStatePtr->state]; + const U32 nbBits = DInfo.nbBits; + BYTE symbol = DInfo.symbol; + size_t lowBits = FSE_readBitsFast(bitD, nbBits); + + DStatePtr->state = DInfo.newState + lowBits; + return symbol; +} + +/* FSE_endOfDStream + Tells if bitD has reached end of bitStream or not */ + +static unsigned FSE_endOfDStream(const FSE_DStream_t* bitD) +{ + return ((bitD->ptr == bitD->start) && (bitD->bitsConsumed == sizeof(bitD->bitContainer)*8)); +} + +static unsigned FSE_endOfDState(const FSE_DState_t* DStatePtr) +{ + return DStatePtr->state == 0; +} + + +FORCE_INLINE size_t FSE_decompress_usingDTable_generic( + void* dst, size_t maxDstSize, + const void* cSrc, size_t cSrcSize, + const FSE_DTable* dt, const unsigned fast) +{ + BYTE* const ostart = (BYTE*) dst; + BYTE* op = ostart; + BYTE* const omax = op + maxDstSize; + BYTE* const olimit = omax-3; + + FSE_DStream_t bitD; + FSE_DState_t state1; + FSE_DState_t state2; + size_t errorCode; + + /* Init */ + errorCode = FSE_initDStream(&bitD, cSrc, cSrcSize); /* replaced last arg by maxCompressed Size */ + if (FSE_isError(errorCode)) return errorCode; + + FSE_initDState(&state1, &bitD, dt); + FSE_initDState(&state2, &bitD, dt); + +#define FSE_GETSYMBOL(statePtr) fast ? FSE_decodeSymbolFast(statePtr, &bitD) : FSE_decodeSymbol(statePtr, &bitD) + + /* 4 symbols per loop */ + for ( ; (FSE_reloadDStream(&bitD)==FSE_DStream_unfinished) && (op sizeof(bitD.bitContainer)*8) /* This test must be static */ + FSE_reloadDStream(&bitD); + + op[1] = FSE_GETSYMBOL(&state2); + + if (FSE_MAX_TABLELOG*4+7 > sizeof(bitD.bitContainer)*8) /* This test must be static */ + { if (FSE_reloadDStream(&bitD) > FSE_DStream_unfinished) { op+=2; break; } } + + op[2] = FSE_GETSYMBOL(&state1); + + if (FSE_MAX_TABLELOG*2+7 > sizeof(bitD.bitContainer)*8) /* This test must be static */ + FSE_reloadDStream(&bitD); + + op[3] = FSE_GETSYMBOL(&state2); + } + + /* tail */ + /* note : FSE_reloadDStream(&bitD) >= FSE_DStream_partiallyFilled; Ends at exactly FSE_DStream_completed */ + while (1) + { + if ( (FSE_reloadDStream(&bitD)>FSE_DStream_completed) || (op==omax) || (FSE_endOfDStream(&bitD) && (fast || FSE_endOfDState(&state1))) ) + break; + + *op++ = FSE_GETSYMBOL(&state1); + + if ( (FSE_reloadDStream(&bitD)>FSE_DStream_completed) || (op==omax) || (FSE_endOfDStream(&bitD) && (fast || FSE_endOfDState(&state2))) ) + break; + + *op++ = FSE_GETSYMBOL(&state2); + } + + /* end ? */ + if (FSE_endOfDStream(&bitD) && FSE_endOfDState(&state1) && FSE_endOfDState(&state2)) + return op-ostart; + + if (op==omax) return (size_t)-FSE_ERROR_dstSize_tooSmall; /* dst buffer is full, but cSrc unfinished */ + + return (size_t)-FSE_ERROR_corruptionDetected; +} + + +static size_t FSE_decompress_usingDTable(void* dst, size_t originalSize, + const void* cSrc, size_t cSrcSize, + const FSE_DTable* dt) +{ + FSE_DTableHeader DTableH; + memcpy(&DTableH, dt, sizeof(DTableH)); /* memcpy() into local variable, to avoid strict aliasing warning */ + + /* select fast mode (static) */ + if (DTableH.fastMode) return FSE_decompress_usingDTable_generic(dst, originalSize, cSrc, cSrcSize, dt, 1); + return FSE_decompress_usingDTable_generic(dst, originalSize, cSrc, cSrcSize, dt, 0); +} + + +static size_t FSE_decompress(void* dst, size_t maxDstSize, const void* cSrc, size_t cSrcSize) +{ + const BYTE* const istart = (const BYTE*)cSrc; + const BYTE* ip = istart; + short counting[FSE_MAX_SYMBOL_VALUE+1]; + DTable_max_t dt; /* Static analyzer seems unable to understand this table will be properly initialized later */ + unsigned tableLog; + unsigned maxSymbolValue = FSE_MAX_SYMBOL_VALUE; + size_t errorCode; + + if (cSrcSize<2) return (size_t)-FSE_ERROR_srcSize_wrong; /* too small input size */ + + /* normal FSE decoding mode */ + errorCode = FSE_readNCount (counting, &maxSymbolValue, &tableLog, istart, cSrcSize); + if (FSE_isError(errorCode)) return errorCode; + if (errorCode >= cSrcSize) return (size_t)-FSE_ERROR_srcSize_wrong; /* too small input size */ + ip += errorCode; + cSrcSize -= errorCode; + + errorCode = FSE_buildDTable (dt, counting, maxSymbolValue, tableLog); + if (FSE_isError(errorCode)) return errorCode; + + /* always return, even if it is an error code */ + return FSE_decompress_usingDTable (dst, maxDstSize, ip, cSrcSize, dt); +} + + + +/* ******************************************************* +* Huff0 : Huffman block compression +*********************************************************/ +#define HUF_MAX_SYMBOL_VALUE 255 +#define HUF_DEFAULT_TABLELOG 12 /* used by default, when not specified */ +#define HUF_MAX_TABLELOG 12 /* max possible tableLog; for allocation purpose; can be modified */ +#define HUF_ABSOLUTEMAX_TABLELOG 16 /* absolute limit of HUF_MAX_TABLELOG. Beyond that value, code does not work */ +#if (HUF_MAX_TABLELOG > HUF_ABSOLUTEMAX_TABLELOG) +# error "HUF_MAX_TABLELOG is too large !" +#endif + +typedef struct HUF_CElt_s { + U16 val; + BYTE nbBits; +} HUF_CElt ; + +typedef struct nodeElt_s { + U32 count; + U16 parent; + BYTE byte; + BYTE nbBits; +} nodeElt; + + +/* ******************************************************* +* Huff0 : Huffman block decompression +*********************************************************/ +typedef struct { + BYTE byte; + BYTE nbBits; +} HUF_DElt; + +static size_t HUF_readDTable (U16* DTable, const void* src, size_t srcSize) +{ + BYTE huffWeight[HUF_MAX_SYMBOL_VALUE + 1]; + U32 rankVal[HUF_ABSOLUTEMAX_TABLELOG + 1]; /* large enough for values from 0 to 16 */ + U32 weightTotal; + U32 maxBits; + const BYTE* ip = (const BYTE*) src; + size_t iSize; + size_t oSize; + U32 n; + U32 nextRankStart; + void* ptr = DTable+1; + HUF_DElt* const dt = (HUF_DElt*)ptr; + + if (!srcSize) return (size_t)-FSE_ERROR_srcSize_wrong; + iSize = ip[0]; + + FSE_STATIC_ASSERT(sizeof(HUF_DElt) == sizeof(U16)); /* if compilation fails here, assertion is false */ + //memset(huffWeight, 0, sizeof(huffWeight)); /* should not be necessary, but some analyzer complain ... */ + if (iSize >= 128) /* special header */ + { + if (iSize >= (242)) /* RLE */ + { + static int l[14] = { 1, 2, 3, 4, 7, 8, 15, 16, 31, 32, 63, 64, 127, 128 }; + oSize = l[iSize-242]; + memset(huffWeight, 1, sizeof(huffWeight)); + iSize = 0; + } + else /* Incompressible */ + { + oSize = iSize - 127; + iSize = ((oSize+1)/2); + if (iSize+1 > srcSize) return (size_t)-FSE_ERROR_srcSize_wrong; + ip += 1; + for (n=0; n> 4; + huffWeight[n+1] = ip[n/2] & 15; + } + } + } + else /* header compressed with FSE (normal case) */ + { + if (iSize+1 > srcSize) return (size_t)-FSE_ERROR_srcSize_wrong; + oSize = FSE_decompress(huffWeight, HUF_MAX_SYMBOL_VALUE, ip+1, iSize); /* max 255 values decoded, last one is implied */ + if (FSE_isError(oSize)) return oSize; + } + + /* collect weight stats */ + memset(rankVal, 0, sizeof(rankVal)); + weightTotal = 0; + for (n=0; n= HUF_ABSOLUTEMAX_TABLELOG) return (size_t)-FSE_ERROR_corruptionDetected; + rankVal[huffWeight[n]]++; + weightTotal += (1 << huffWeight[n]) >> 1; + } + if (weightTotal == 0) return (size_t)-FSE_ERROR_corruptionDetected; + + /* get last non-null symbol weight (implied, total must be 2^n) */ + maxBits = FSE_highbit32(weightTotal) + 1; + if (maxBits > DTable[0]) return (size_t)-FSE_ERROR_tableLog_tooLarge; /* DTable is too small */ + DTable[0] = (U16)maxBits; + { + U32 total = 1 << maxBits; + U32 rest = total - weightTotal; + U32 verif = 1 << FSE_highbit32(rest); + U32 lastWeight = FSE_highbit32(rest) + 1; + if (verif != rest) return (size_t)-FSE_ERROR_corruptionDetected; /* last value must be a clean power of 2 */ + huffWeight[oSize] = (BYTE)lastWeight; + rankVal[lastWeight]++; + } + + /* check tree construction validity */ + if ((rankVal[1] < 2) || (rankVal[1] & 1)) return (size_t)-FSE_ERROR_corruptionDetected; /* by construction : at least 2 elts of rank 1, must be even */ + + /* Prepare ranks */ + nextRankStart = 0; + for (n=1; n<=maxBits; n++) + { + U32 current = nextRankStart; + nextRankStart += (rankVal[n] << (n-1)); + rankVal[n] = current; + } + + /* fill DTable */ + for (n=0; n<=oSize; n++) + { + const U32 w = huffWeight[n]; + const U32 length = (1 << w) >> 1; + U32 i; + HUF_DElt D; + D.byte = (BYTE)n; D.nbBits = (BYTE)(maxBits + 1 - w); + for (i = rankVal[w]; i < rankVal[w] + length; i++) + dt[i] = D; + rankVal[w] += length; + } + + return iSize+1; +} + + +static BYTE HUF_decodeSymbol(FSE_DStream_t* Dstream, const HUF_DElt* dt, const U32 dtLog) +{ + const size_t val = FSE_lookBitsFast(Dstream, dtLog); /* note : dtLog >= 1 */ + const BYTE c = dt[val].byte; + FSE_skipBits(Dstream, dt[val].nbBits); + return c; +} + +static size_t HUF_decompress_usingDTable( /* -3% slower when non static */ + void* dst, size_t maxDstSize, + const void* cSrc, size_t cSrcSize, + const U16* DTable) +{ + if (cSrcSize < 6) return (size_t)-FSE_ERROR_srcSize_wrong; + { + BYTE* const ostart = (BYTE*) dst; + BYTE* op = ostart; + BYTE* const omax = op + maxDstSize; + BYTE* const olimit = maxDstSize < 15 ? op : omax-15; + + const void* ptr = DTable; + const HUF_DElt* const dt = (const HUF_DElt*)(ptr)+1; + const U32 dtLog = DTable[0]; + size_t errorCode; + U32 reloadStatus; + + /* Init */ + + const U16* jumpTable = (const U16*)cSrc; + const size_t length1 = FSE_readLE16(jumpTable); + const size_t length2 = FSE_readLE16(jumpTable+1); + const size_t length3 = FSE_readLE16(jumpTable+2); + const size_t length4 = cSrcSize - 6 - length1 - length2 - length3; /* check coherency !! */ + const char* const start1 = (const char*)(cSrc) + 6; + const char* const start2 = start1 + length1; + const char* const start3 = start2 + length2; + const char* const start4 = start3 + length3; + FSE_DStream_t bitD1, bitD2, bitD3, bitD4; + + if (length1+length2+length3+6 >= cSrcSize) return (size_t)-FSE_ERROR_srcSize_wrong; + + errorCode = FSE_initDStream(&bitD1, start1, length1); + if (FSE_isError(errorCode)) return errorCode; + errorCode = FSE_initDStream(&bitD2, start2, length2); + if (FSE_isError(errorCode)) return errorCode; + errorCode = FSE_initDStream(&bitD3, start3, length3); + if (FSE_isError(errorCode)) return errorCode; + errorCode = FSE_initDStream(&bitD4, start4, length4); + if (FSE_isError(errorCode)) return errorCode; + + reloadStatus=FSE_reloadDStream(&bitD2); + + /* 16 symbols per loop */ + for ( ; (reloadStatus12)) FSE_reloadDStream(&Dstream) + + #define HUF_DECODE_SYMBOL_2(n, Dstream) \ + op[n] = HUF_decodeSymbol(&Dstream, dt, dtLog); \ + if (FSE_32bits()) FSE_reloadDStream(&Dstream) + + HUF_DECODE_SYMBOL_1( 0, bitD1); + HUF_DECODE_SYMBOL_1( 1, bitD2); + HUF_DECODE_SYMBOL_1( 2, bitD3); + HUF_DECODE_SYMBOL_1( 3, bitD4); + HUF_DECODE_SYMBOL_2( 4, bitD1); + HUF_DECODE_SYMBOL_2( 5, bitD2); + HUF_DECODE_SYMBOL_2( 6, bitD3); + HUF_DECODE_SYMBOL_2( 7, bitD4); + HUF_DECODE_SYMBOL_1( 8, bitD1); + HUF_DECODE_SYMBOL_1( 9, bitD2); + HUF_DECODE_SYMBOL_1(10, bitD3); + HUF_DECODE_SYMBOL_1(11, bitD4); + HUF_DECODE_SYMBOL_0(12, bitD1); + HUF_DECODE_SYMBOL_0(13, bitD2); + HUF_DECODE_SYMBOL_0(14, bitD3); + HUF_DECODE_SYMBOL_0(15, bitD4); + } + + if (reloadStatus!=FSE_DStream_completed) /* not complete : some bitStream might be FSE_DStream_unfinished */ + return (size_t)-FSE_ERROR_corruptionDetected; + + /* tail */ + { + /* bitTail = bitD1; */ /* *much* slower : -20% !??! */ + FSE_DStream_t bitTail; + bitTail.ptr = bitD1.ptr; + bitTail.bitsConsumed = bitD1.bitsConsumed; + bitTail.bitContainer = bitD1.bitContainer; /* required in case of FSE_DStream_endOfBuffer */ + bitTail.start = start1; + for ( ; (FSE_reloadDStream(&bitTail) < FSE_DStream_completed) && (op= cSrcSize) return (size_t)-FSE_ERROR_srcSize_wrong; + ip += errorCode; + cSrcSize -= errorCode; + + return HUF_decompress_usingDTable (dst, maxDstSize, ip, cSrcSize, DTable); +} + + +#endif /* FSE_COMMONDEFS_ONLY */ + +/* + zstd - standard compression library + Copyright (C) 2014-2015, Yann Collet. + + BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions are + met: + * Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + * Redistributions in binary form must reproduce the above + copyright notice, this list of conditions and the following disclaimer + in the documentation and/or other materials provided with the + distribution. + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + + You can contact the author at : + - zstd source repository : https://github.com/Cyan4973/zstd + - ztsd public forum : https://groups.google.com/forum/#!forum/lz4c +*/ + +/**************************************************************** +* Tuning parameters +*****************************************************************/ +/* MEMORY_USAGE : +* Memory usage formula : N->2^N Bytes (examples : 10 -> 1KB; 12 -> 4KB ; 16 -> 64KB; 20 -> 1MB; etc.) +* Increasing memory usage improves compression ratio +* Reduced memory usage can improve speed, due to cache effect */ +#define ZSTD_MEMORY_USAGE 17 + + +/************************************** + CPU Feature Detection +**************************************/ +/* + * Automated efficient unaligned memory access detection + * Based on known hardware architectures + * This list will be updated thanks to feedbacks + */ +#if defined(CPU_HAS_EFFICIENT_UNALIGNED_MEMORY_ACCESS) \ + || defined(__ARM_FEATURE_UNALIGNED) \ + || defined(__i386__) || defined(__x86_64__) \ + || defined(_M_IX86) || defined(_M_X64) \ + || defined(__ARM_ARCH_7__) || defined(__ARM_ARCH_8__) \ + || (defined(_M_ARM) && (_M_ARM >= 7)) +# define ZSTD_UNALIGNED_ACCESS 1 +#else +# define ZSTD_UNALIGNED_ACCESS 0 +#endif + + +/******************************************************** +* Includes +*********************************************************/ +#include /* calloc */ +#include /* memcpy, memmove */ +#include /* debug : printf */ + + +/******************************************************** +* Compiler specifics +*********************************************************/ +#ifdef __AVX2__ +# include /* AVX2 intrinsics */ +#endif + +#ifdef _MSC_VER /* Visual Studio */ +# include /* For Visual 2005 */ +# pragma warning(disable : 4127) /* disable: C4127: conditional expression is constant */ +# pragma warning(disable : 4324) /* disable: C4324: padded structure */ +#endif + + +#ifndef MEM_ACCESS_MODULE +#define MEM_ACCESS_MODULE +/******************************************************** +* Basic Types +*********************************************************/ +#if defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L /* C99 */ +# if defined(_AIX) +# include +# else +# include /* intptr_t */ +# endif +typedef uint8_t BYTE; +typedef uint16_t U16; +typedef int16_t S16; +typedef uint32_t U32; +typedef int32_t S32; +typedef uint64_t U64; +#else +typedef unsigned char BYTE; +typedef unsigned short U16; +typedef signed short S16; +typedef unsigned int U32; +typedef signed int S32; +typedef unsigned long long U64; +#endif + +#endif /* MEM_ACCESS_MODULE */ + + +/******************************************************** +* Constants +*********************************************************/ +static const U32 ZSTD_magicNumber = 0xFD2FB51E; /* 3rd version : seqNb header */ + +#define HASH_LOG (ZSTD_MEMORY_USAGE - 2) +#define HASH_TABLESIZE (1 << HASH_LOG) +#define HASH_MASK (HASH_TABLESIZE - 1) + +#define KNUTH 2654435761 + +#define BIT7 128 +#define BIT6 64 +#define BIT5 32 +#define BIT4 16 + +#define KB *(1 <<10) +#define MB *(1 <<20) +#define GB *(1U<<30) + +#define BLOCKSIZE (128 KB) /* define, for static allocation */ + +#define WORKPLACESIZE (BLOCKSIZE*3) +#define MINMATCH 4 +#define MLbits 7 +#define LLbits 6 +#define Offbits 5 +#define MaxML ((1<>3]; +#else + U32 hashTable[HASH_TABLESIZE]; +#endif + BYTE buffer[WORKPLACESIZE]; +} cctxi_t; + + + + +/************************************** +* Error Management +**************************************/ +/* published entry point */ +unsigned ZSTDv01_isError(size_t code) { return ERR_isError(code); } + + +/************************************** +* Tool functions +**************************************/ +#define ZSTD_VERSION_MAJOR 0 /* for breaking interface changes */ +#define ZSTD_VERSION_MINOR 1 /* for new (non-breaking) interface capabilities */ +#define ZSTD_VERSION_RELEASE 3 /* for tweaks, bug-fixes, or development */ +#define ZSTD_VERSION_NUMBER (ZSTD_VERSION_MAJOR *100*100 + ZSTD_VERSION_MINOR *100 + ZSTD_VERSION_RELEASE) + +/************************************************************** +* Decompression code +**************************************************************/ + +static size_t ZSTDv01_getcBlockSize(const void* src, size_t srcSize, blockProperties_t* bpPtr) +{ + const BYTE* const in = (const BYTE* const)src; + BYTE headerFlags; + U32 cSize; + + if (srcSize < 3) return ERROR(srcSize_wrong); + + headerFlags = *in; + cSize = in[2] + (in[1]<<8) + ((in[0] & 7)<<16); + + bpPtr->blockType = (blockType_t)(headerFlags >> 6); + bpPtr->origSize = (bpPtr->blockType == bt_rle) ? cSize : 0; + + if (bpPtr->blockType == bt_end) return 0; + if (bpPtr->blockType == bt_rle) return 1; + return cSize; +} + + +static size_t ZSTD_copyUncompressedBlock(void* dst, size_t maxDstSize, const void* src, size_t srcSize) +{ + if (srcSize > maxDstSize) return ERROR(dstSize_tooSmall); + if (srcSize > 0) { + memcpy(dst, src, srcSize); + } + return srcSize; +} + + +static size_t ZSTD_decompressLiterals(void* ctx, + void* dst, size_t maxDstSize, + const void* src, size_t srcSize) +{ + BYTE* op = (BYTE*)dst; + BYTE* const oend = op + maxDstSize; + const BYTE* ip = (const BYTE*)src; + size_t errorCode; + size_t litSize; + + /* check : minimum 2, for litSize, +1, for content */ + if (srcSize <= 3) return ERROR(corruption_detected); + + litSize = ip[1] + (ip[0]<<8); + litSize += ((ip[-3] >> 3) & 7) << 16; /* mmmmh.... */ + op = oend - litSize; + + (void)ctx; + if (litSize > maxDstSize) return ERROR(dstSize_tooSmall); + errorCode = HUF_decompress(op, litSize, ip+2, srcSize-2); + if (FSE_isError(errorCode)) return ERROR(GENERIC); + return litSize; +} + + +static size_t ZSTDv01_decodeLiteralsBlock(void* ctx, + void* dst, size_t maxDstSize, + const BYTE** litStart, size_t* litSize, + const void* src, size_t srcSize) +{ + const BYTE* const istart = (const BYTE* const)src; + const BYTE* ip = istart; + BYTE* const ostart = (BYTE* const)dst; + BYTE* const oend = ostart + maxDstSize; + blockProperties_t litbp; + + size_t litcSize = ZSTDv01_getcBlockSize(src, srcSize, &litbp); + if (ZSTDv01_isError(litcSize)) return litcSize; + if (litcSize > srcSize - ZSTD_blockHeaderSize) return ERROR(srcSize_wrong); + ip += ZSTD_blockHeaderSize; + + switch(litbp.blockType) + { + case bt_raw: + *litStart = ip; + ip += litcSize; + *litSize = litcSize; + break; + case bt_rle: + { + size_t rleSize = litbp.origSize; + if (rleSize>maxDstSize) return ERROR(dstSize_tooSmall); + if (!srcSize) return ERROR(srcSize_wrong); + if (rleSize > 0) { + memset(oend - rleSize, *ip, rleSize); + } + *litStart = oend - rleSize; + *litSize = rleSize; + ip++; + break; + } + case bt_compressed: + { + size_t decodedLitSize = ZSTD_decompressLiterals(ctx, dst, maxDstSize, ip, litcSize); + if (ZSTDv01_isError(decodedLitSize)) return decodedLitSize; + *litStart = oend - decodedLitSize; + *litSize = decodedLitSize; + ip += litcSize; + break; + } + case bt_end: + default: + return ERROR(GENERIC); + } + + return ip-istart; +} + + +static size_t ZSTDv01_decodeSeqHeaders(int* nbSeq, const BYTE** dumpsPtr, size_t* dumpsLengthPtr, + FSE_DTable* DTableLL, FSE_DTable* DTableML, FSE_DTable* DTableOffb, + const void* src, size_t srcSize) +{ + const BYTE* const istart = (const BYTE* const)src; + const BYTE* ip = istart; + const BYTE* const iend = istart + srcSize; + U32 LLtype, Offtype, MLtype; + U32 LLlog, Offlog, MLlog; + size_t dumpsLength; + + /* check */ + if (srcSize < 5) return ERROR(srcSize_wrong); + + /* SeqHead */ + *nbSeq = ZSTD_readLE16(ip); ip+=2; + LLtype = *ip >> 6; + Offtype = (*ip >> 4) & 3; + MLtype = (*ip >> 2) & 3; + if (*ip & 2) + { + dumpsLength = ip[2]; + dumpsLength += ip[1] << 8; + ip += 3; + } + else + { + dumpsLength = ip[1]; + dumpsLength += (ip[0] & 1) << 8; + ip += 2; + } + *dumpsPtr = ip; + ip += dumpsLength; + *dumpsLengthPtr = dumpsLength; + + /* check */ + if (ip > iend-3) return ERROR(srcSize_wrong); /* min : all 3 are "raw", hence no header, but at least xxLog bits per type */ + + /* sequences */ + { + S16 norm[MaxML+1]; /* assumption : MaxML >= MaxLL and MaxOff */ + size_t headerSize; + + /* Build DTables */ + switch(LLtype) + { + case bt_rle : + LLlog = 0; + FSE_buildDTable_rle(DTableLL, *ip++); break; + case bt_raw : + LLlog = LLbits; + FSE_buildDTable_raw(DTableLL, LLbits); break; + default : + { U32 max = MaxLL; + headerSize = FSE_readNCount(norm, &max, &LLlog, ip, iend-ip); + if (FSE_isError(headerSize)) return ERROR(GENERIC); + if (LLlog > LLFSELog) return ERROR(corruption_detected); + ip += headerSize; + FSE_buildDTable(DTableLL, norm, max, LLlog); + } } + + switch(Offtype) + { + case bt_rle : + Offlog = 0; + if (ip > iend-2) return ERROR(srcSize_wrong); /* min : "raw", hence no header, but at least xxLog bits */ + FSE_buildDTable_rle(DTableOffb, *ip++); break; + case bt_raw : + Offlog = Offbits; + FSE_buildDTable_raw(DTableOffb, Offbits); break; + default : + { U32 max = MaxOff; + headerSize = FSE_readNCount(norm, &max, &Offlog, ip, iend-ip); + if (FSE_isError(headerSize)) return ERROR(GENERIC); + if (Offlog > OffFSELog) return ERROR(corruption_detected); + ip += headerSize; + FSE_buildDTable(DTableOffb, norm, max, Offlog); + } } + + switch(MLtype) + { + case bt_rle : + MLlog = 0; + if (ip > iend-2) return ERROR(srcSize_wrong); /* min : "raw", hence no header, but at least xxLog bits */ + FSE_buildDTable_rle(DTableML, *ip++); break; + case bt_raw : + MLlog = MLbits; + FSE_buildDTable_raw(DTableML, MLbits); break; + default : + { U32 max = MaxML; + headerSize = FSE_readNCount(norm, &max, &MLlog, ip, iend-ip); + if (FSE_isError(headerSize)) return ERROR(GENERIC); + if (MLlog > MLFSELog) return ERROR(corruption_detected); + ip += headerSize; + FSE_buildDTable(DTableML, norm, max, MLlog); + } } } + + return ip-istart; +} + + +typedef struct { + size_t litLength; + size_t offset; + size_t matchLength; +} seq_t; + +typedef struct { + FSE_DStream_t DStream; + FSE_DState_t stateLL; + FSE_DState_t stateOffb; + FSE_DState_t stateML; + size_t prevOffset; + const BYTE* dumps; + const BYTE* dumpsEnd; +} seqState_t; + + +static void ZSTD_decodeSequence(seq_t* seq, seqState_t* seqState) +{ + size_t litLength; + size_t prevOffset; + size_t offset; + size_t matchLength; + const BYTE* dumps = seqState->dumps; + const BYTE* const de = seqState->dumpsEnd; + + /* Literal length */ + litLength = FSE_decodeSymbol(&(seqState->stateLL), &(seqState->DStream)); + prevOffset = litLength ? seq->offset : seqState->prevOffset; + seqState->prevOffset = seq->offset; + if (litLength == MaxLL) + { + const U32 add = dumpsstateOffb), &(seqState->DStream)); + if (ZSTD_32bits()) FSE_reloadDStream(&(seqState->DStream)); + nbBits = offsetCode - 1; + if (offsetCode==0) nbBits = 0; /* cmove */ + offset = ((size_t)1 << (nbBits & ((sizeof(offset)*8)-1))) + FSE_readBits(&(seqState->DStream), nbBits); + if (ZSTD_32bits()) FSE_reloadDStream(&(seqState->DStream)); + if (offsetCode==0) offset = prevOffset; + } + + /* MatchLength */ + matchLength = FSE_decodeSymbol(&(seqState->stateML), &(seqState->DStream)); + if (matchLength == MaxML) + { + const U32 add = dumpslitLength = litLength; + seq->offset = offset; + seq->matchLength = matchLength; + seqState->dumps = dumps; +} + + +static size_t ZSTD_execSequence(BYTE* op, + seq_t sequence, + const BYTE** litPtr, const BYTE* const litLimit, + BYTE* const base, BYTE* const oend) +{ + static const int dec32table[] = {0, 1, 2, 1, 4, 4, 4, 4}; /* added */ + static const int dec64table[] = {8, 8, 8, 7, 8, 9,10,11}; /* subtracted */ + const BYTE* const ostart = op; + const size_t litLength = sequence.litLength; + BYTE* const endMatch = op + litLength + sequence.matchLength; /* risk : address space overflow (32-bits) */ + const BYTE* const litEnd = *litPtr + litLength; + + /* check */ + if (endMatch > oend) return ERROR(dstSize_tooSmall); /* overwrite beyond dst buffer */ + if (litEnd > litLimit) return ERROR(corruption_detected); + if (sequence.matchLength > (size_t)(*litPtr-op)) return ERROR(dstSize_tooSmall); /* overwrite literal segment */ + + /* copy Literals */ + if (((size_t)(*litPtr - op) < 8) || ((size_t)(oend-litEnd) < 8) || (op+litLength > oend-8)) + memmove(op, *litPtr, litLength); /* overwrite risk */ + else + ZSTD_wildcopy(op, *litPtr, litLength); + op += litLength; + *litPtr = litEnd; /* update for next sequence */ + + /* check : last match must be at a minimum distance of 8 from end of dest buffer */ + if (oend-op < 8) return ERROR(dstSize_tooSmall); + + /* copy Match */ + { + const U32 overlapRisk = (((size_t)(litEnd - endMatch)) < 12); + const BYTE* match = op - sequence.offset; /* possible underflow at op - offset ? */ + size_t qutt = 12; + U64 saved[2]; + + /* check */ + if (match < base) return ERROR(corruption_detected); + if (sequence.offset > (size_t)base) return ERROR(corruption_detected); + + /* save beginning of literal sequence, in case of write overlap */ + if (overlapRisk) + { + if ((endMatch + qutt) > oend) qutt = oend-endMatch; + memcpy(saved, endMatch, qutt); + } + + if (sequence.offset < 8) + { + const int dec64 = dec64table[sequence.offset]; + op[0] = match[0]; + op[1] = match[1]; + op[2] = match[2]; + op[3] = match[3]; + match += dec32table[sequence.offset]; + ZSTD_copy4(op+4, match); + match -= dec64; + } else { ZSTD_copy8(op, match); } + op += 8; match += 8; + + if (endMatch > oend-(16-MINMATCH)) + { + if (op < oend-8) + { + ZSTD_wildcopy(op, match, (oend-8) - op); + match += (oend-8) - op; + op = oend-8; + } + while (opLLTable; + U32* DTableML = dctx->MLTable; + U32* DTableOffb = dctx->OffTable; + BYTE* const base = (BYTE*) (dctx->base); + + /* Build Decoding Tables */ + errorCode = ZSTDv01_decodeSeqHeaders(&nbSeq, &dumps, &dumpsLength, + DTableLL, DTableML, DTableOffb, + ip, iend-ip); + if (ZSTDv01_isError(errorCode)) return errorCode; + ip += errorCode; + + /* Regen sequences */ + { + seq_t sequence; + seqState_t seqState; + + memset(&sequence, 0, sizeof(sequence)); + seqState.dumps = dumps; + seqState.dumpsEnd = dumps + dumpsLength; + seqState.prevOffset = 1; + errorCode = FSE_initDStream(&(seqState.DStream), ip, iend-ip); + if (FSE_isError(errorCode)) return ERROR(corruption_detected); + FSE_initDState(&(seqState.stateLL), &(seqState.DStream), DTableLL); + FSE_initDState(&(seqState.stateOffb), &(seqState.DStream), DTableOffb); + FSE_initDState(&(seqState.stateML), &(seqState.DStream), DTableML); + + for ( ; (FSE_reloadDStream(&(seqState.DStream)) <= FSE_DStream_completed) && (nbSeq>0) ; ) + { + size_t oneSeqSize; + nbSeq--; + ZSTD_decodeSequence(&sequence, &seqState); + oneSeqSize = ZSTD_execSequence(op, sequence, &litPtr, litEnd, base, oend); + if (ZSTDv01_isError(oneSeqSize)) return oneSeqSize; + op += oneSeqSize; + } + + /* check if reached exact end */ + if ( !FSE_endOfDStream(&(seqState.DStream)) ) return ERROR(corruption_detected); /* requested too much : data is corrupted */ + if (nbSeq<0) return ERROR(corruption_detected); /* requested too many sequences : data is corrupted */ + + /* last literal segment */ + { + size_t lastLLSize = litEnd - litPtr; + if (op+lastLLSize > oend) return ERROR(dstSize_tooSmall); + if (lastLLSize > 0) { + if (op != litPtr) memmove(op, litPtr, lastLLSize); + op += lastLLSize; + } + } + } + + return op-ostart; +} + + +static size_t ZSTD_decompressBlock( + void* ctx, + void* dst, size_t maxDstSize, + const void* src, size_t srcSize) +{ + /* blockType == blockCompressed, srcSize is trusted */ + const BYTE* ip = (const BYTE*)src; + const BYTE* litPtr = NULL; + size_t litSize = 0; + size_t errorCode; + + /* Decode literals sub-block */ + errorCode = ZSTDv01_decodeLiteralsBlock(ctx, dst, maxDstSize, &litPtr, &litSize, src, srcSize); + if (ZSTDv01_isError(errorCode)) return errorCode; + ip += errorCode; + srcSize -= errorCode; + + return ZSTD_decompressSequences(ctx, dst, maxDstSize, ip, srcSize, litPtr, litSize); +} + + +size_t ZSTDv01_decompressDCtx(void* ctx, void* dst, size_t maxDstSize, const void* src, size_t srcSize) +{ + const BYTE* ip = (const BYTE*)src; + const BYTE* iend = ip + srcSize; + BYTE* const ostart = (BYTE* const)dst; + BYTE* op = ostart; + BYTE* const oend = ostart + maxDstSize; + size_t remainingSize = srcSize; + U32 magicNumber; + size_t errorCode=0; + blockProperties_t blockProperties; + + /* Frame Header */ + if (srcSize < ZSTD_frameHeaderSize+ZSTD_blockHeaderSize) return ERROR(srcSize_wrong); + magicNumber = ZSTD_readBE32(src); + if (magicNumber != ZSTD_magicNumber) return ERROR(prefix_unknown); + ip += ZSTD_frameHeaderSize; remainingSize -= ZSTD_frameHeaderSize; + + /* Loop on each block */ + while (1) + { + size_t blockSize = ZSTDv01_getcBlockSize(ip, iend-ip, &blockProperties); + if (ZSTDv01_isError(blockSize)) return blockSize; + + ip += ZSTD_blockHeaderSize; + remainingSize -= ZSTD_blockHeaderSize; + if (blockSize > remainingSize) return ERROR(srcSize_wrong); + + switch(blockProperties.blockType) + { + case bt_compressed: + errorCode = ZSTD_decompressBlock(ctx, op, oend-op, ip, blockSize); + break; + case bt_raw : + errorCode = ZSTD_copyUncompressedBlock(op, oend-op, ip, blockSize); + break; + case bt_rle : + return ERROR(GENERIC); /* not yet supported */ + break; + case bt_end : + /* end of frame */ + if (remainingSize) return ERROR(srcSize_wrong); + break; + default: + return ERROR(GENERIC); + } + if (blockSize == 0) break; /* bt_end */ + + if (ZSTDv01_isError(errorCode)) return errorCode; + op += errorCode; + ip += blockSize; + remainingSize -= blockSize; + } + + return op-ostart; +} + +size_t ZSTDv01_decompress(void* dst, size_t maxDstSize, const void* src, size_t srcSize) +{ + dctx_t ctx; + ctx.base = dst; + return ZSTDv01_decompressDCtx(&ctx, dst, maxDstSize, src, srcSize); +} + +/* ZSTD_errorFrameSizeInfoLegacy() : + assumes `cSize` and `dBound` are _not_ NULL */ +static void ZSTD_errorFrameSizeInfoLegacy(size_t* cSize, unsigned long long* dBound, size_t ret) +{ + *cSize = ret; + *dBound = ZSTD_CONTENTSIZE_ERROR; +} + +void ZSTDv01_findFrameSizeInfoLegacy(const void *src, size_t srcSize, size_t* cSize, unsigned long long* dBound) +{ + const BYTE* ip = (const BYTE*)src; + size_t remainingSize = srcSize; + size_t nbBlocks = 0; + U32 magicNumber; + blockProperties_t blockProperties; + + /* Frame Header */ + if (srcSize < ZSTD_frameHeaderSize+ZSTD_blockHeaderSize) { + ZSTD_errorFrameSizeInfoLegacy(cSize, dBound, ERROR(srcSize_wrong)); + return; + } + magicNumber = ZSTD_readBE32(src); + if (magicNumber != ZSTD_magicNumber) { + ZSTD_errorFrameSizeInfoLegacy(cSize, dBound, ERROR(prefix_unknown)); + return; + } + ip += ZSTD_frameHeaderSize; remainingSize -= ZSTD_frameHeaderSize; + + /* Loop on each block */ + while (1) + { + size_t blockSize = ZSTDv01_getcBlockSize(ip, remainingSize, &blockProperties); + if (ZSTDv01_isError(blockSize)) { + ZSTD_errorFrameSizeInfoLegacy(cSize, dBound, blockSize); + return; + } + + ip += ZSTD_blockHeaderSize; + remainingSize -= ZSTD_blockHeaderSize; + if (blockSize > remainingSize) { + ZSTD_errorFrameSizeInfoLegacy(cSize, dBound, ERROR(srcSize_wrong)); + return; + } + + if (blockSize == 0) break; /* bt_end */ + + ip += blockSize; + remainingSize -= blockSize; + nbBlocks++; + } + + *cSize = ip - (const BYTE*)src; + *dBound = nbBlocks * BLOCKSIZE; +} + +/******************************* +* Streaming Decompression API +*******************************/ + +size_t ZSTDv01_resetDCtx(ZSTDv01_Dctx* dctx) +{ + dctx->expected = ZSTD_frameHeaderSize; + dctx->phase = 0; + dctx->previousDstEnd = NULL; + dctx->base = NULL; + return 0; +} + +ZSTDv01_Dctx* ZSTDv01_createDCtx(void) +{ + ZSTDv01_Dctx* dctx = (ZSTDv01_Dctx*)malloc(sizeof(ZSTDv01_Dctx)); + if (dctx==NULL) return NULL; + ZSTDv01_resetDCtx(dctx); + return dctx; +} + +size_t ZSTDv01_freeDCtx(ZSTDv01_Dctx* dctx) +{ + free(dctx); + return 0; +} + +size_t ZSTDv01_nextSrcSizeToDecompress(ZSTDv01_Dctx* dctx) +{ + return ((dctx_t*)dctx)->expected; +} + +size_t ZSTDv01_decompressContinue(ZSTDv01_Dctx* dctx, void* dst, size_t maxDstSize, const void* src, size_t srcSize) +{ + dctx_t* ctx = (dctx_t*)dctx; + + /* Sanity check */ + if (srcSize != ctx->expected) return ERROR(srcSize_wrong); + if (dst != ctx->previousDstEnd) /* not contiguous */ + ctx->base = dst; + + /* Decompress : frame header */ + if (ctx->phase == 0) + { + /* Check frame magic header */ + U32 magicNumber = ZSTD_readBE32(src); + if (magicNumber != ZSTD_magicNumber) return ERROR(prefix_unknown); + ctx->phase = 1; + ctx->expected = ZSTD_blockHeaderSize; + return 0; + } + + /* Decompress : block header */ + if (ctx->phase == 1) + { + blockProperties_t bp; + size_t blockSize = ZSTDv01_getcBlockSize(src, ZSTD_blockHeaderSize, &bp); + if (ZSTDv01_isError(blockSize)) return blockSize; + if (bp.blockType == bt_end) + { + ctx->expected = 0; + ctx->phase = 0; + } + else + { + ctx->expected = blockSize; + ctx->bType = bp.blockType; + ctx->phase = 2; + } + + return 0; + } + + /* Decompress : block content */ + { + size_t rSize; + switch(ctx->bType) + { + case bt_compressed: + rSize = ZSTD_decompressBlock(ctx, dst, maxDstSize, src, srcSize); + break; + case bt_raw : + rSize = ZSTD_copyUncompressedBlock(dst, maxDstSize, src, srcSize); + break; + case bt_rle : + return ERROR(GENERIC); /* not yet handled */ + break; + case bt_end : /* should never happen (filtered at phase 1) */ + rSize = 0; + break; + default: + return ERROR(GENERIC); + } + ctx->phase = 1; + ctx->expected = ZSTD_blockHeaderSize; + ctx->previousDstEnd = (void*)( ((char*)dst) + rSize); + return rSize; + } + +} diff --git a/external/zstd/lib/legacy/zstd_v01.h b/external/zstd/lib/legacy/zstd_v01.h new file mode 100644 index 00000000..f777eb6e --- /dev/null +++ b/external/zstd/lib/legacy/zstd_v01.h @@ -0,0 +1,94 @@ +/* + * Copyright (c) Yann Collet, Facebook, Inc. + * All rights reserved. + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. + */ + +#ifndef ZSTD_V01_H_28739879432 +#define ZSTD_V01_H_28739879432 + +#if defined (__cplusplus) +extern "C" { +#endif + +/* ************************************* +* Includes +***************************************/ +#include /* size_t */ + + +/* ************************************* +* Simple one-step function +***************************************/ +/** +ZSTDv01_decompress() : decompress ZSTD frames compliant with v0.1.x format + compressedSize : is the exact source size + maxOriginalSize : is the size of the 'dst' buffer, which must be already allocated. + It must be equal or larger than originalSize, otherwise decompression will fail. + return : the number of bytes decompressed into destination buffer (originalSize) + or an errorCode if it fails (which can be tested using ZSTDv01_isError()) +*/ +size_t ZSTDv01_decompress( void* dst, size_t maxOriginalSize, + const void* src, size_t compressedSize); + + /** + ZSTDv01_findFrameSizeInfoLegacy() : get the source length and decompressed bound of a ZSTD frame compliant with v0.1.x format + srcSize : The size of the 'src' buffer, at least as large as the frame pointed to by 'src' + cSize (output parameter) : the number of bytes that would be read to decompress this frame + or an error code if it fails (which can be tested using ZSTDv01_isError()) + dBound (output parameter) : an upper-bound for the decompressed size of the data in the frame + or ZSTD_CONTENTSIZE_ERROR if an error occurs + + note : assumes `cSize` and `dBound` are _not_ NULL. + */ +void ZSTDv01_findFrameSizeInfoLegacy(const void *src, size_t srcSize, + size_t* cSize, unsigned long long* dBound); + +/** +ZSTDv01_isError() : tells if the result of ZSTDv01_decompress() is an error +*/ +unsigned ZSTDv01_isError(size_t code); + + +/* ************************************* +* Advanced functions +***************************************/ +typedef struct ZSTDv01_Dctx_s ZSTDv01_Dctx; +ZSTDv01_Dctx* ZSTDv01_createDCtx(void); +size_t ZSTDv01_freeDCtx(ZSTDv01_Dctx* dctx); + +size_t ZSTDv01_decompressDCtx(void* ctx, + void* dst, size_t maxOriginalSize, + const void* src, size_t compressedSize); + +/* ************************************* +* Streaming functions +***************************************/ +size_t ZSTDv01_resetDCtx(ZSTDv01_Dctx* dctx); + +size_t ZSTDv01_nextSrcSizeToDecompress(ZSTDv01_Dctx* dctx); +size_t ZSTDv01_decompressContinue(ZSTDv01_Dctx* dctx, void* dst, size_t maxDstSize, const void* src, size_t srcSize); +/** + Use above functions alternatively. + ZSTD_nextSrcSizeToDecompress() tells how much bytes to provide as 'srcSize' to ZSTD_decompressContinue(). + ZSTD_decompressContinue() will use previous data blocks to improve compression if they are located prior to current block. + Result is the number of bytes regenerated within 'dst'. + It can be zero, which is not an error; it just means ZSTD_decompressContinue() has decoded some header. +*/ + +/* ************************************* +* Prefix - version detection +***************************************/ +#define ZSTDv01_magicNumber 0xFD2FB51E /* Big Endian version */ +#define ZSTDv01_magicNumberLE 0x1EB52FFD /* Little Endian version */ + + +#if defined (__cplusplus) +} +#endif + +#endif /* ZSTD_V01_H_28739879432 */ diff --git a/external/zstd/lib/legacy/zstd_v02.c b/external/zstd/lib/legacy/zstd_v02.c new file mode 100644 index 00000000..89fdc716 --- /dev/null +++ b/external/zstd/lib/legacy/zstd_v02.c @@ -0,0 +1,3522 @@ +/* + * Copyright (c) Yann Collet, Facebook, Inc. + * All rights reserved. + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. + */ + + +#include /* size_t, ptrdiff_t */ +#include "zstd_v02.h" +#include "../common/error_private.h" + + +/****************************************** +* Compiler-specific +******************************************/ +#if defined(_MSC_VER) /* Visual Studio */ +# include /* _byteswap_ulong */ +# include /* _byteswap_* */ +#endif + + +/* ****************************************************************** + mem.h + low-level memory access routines + Copyright (C) 2013-2015, Yann Collet. + + BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions are + met: + + * Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + * Redistributions in binary form must reproduce the above + copyright notice, this list of conditions and the following disclaimer + in the documentation and/or other materials provided with the + distribution. + + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + + You can contact the author at : + - FSE source repository : https://github.com/Cyan4973/FiniteStateEntropy + - Public forum : https://groups.google.com/forum/#!forum/lz4c +****************************************************************** */ +#ifndef MEM_H_MODULE +#define MEM_H_MODULE + +#if defined (__cplusplus) +extern "C" { +#endif + +/****************************************** +* Includes +******************************************/ +#include /* size_t, ptrdiff_t */ +#include /* memcpy */ + + +/****************************************** +* Compiler-specific +******************************************/ +#if defined(__GNUC__) +# define MEM_STATIC static __attribute__((unused)) +#elif defined (__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */) +# define MEM_STATIC static inline +#elif defined(_MSC_VER) +# define MEM_STATIC static __inline +#else +# define MEM_STATIC static /* this version may generate warnings for unused static functions; disable the relevant warning */ +#endif + + +/**************************************************************** +* Basic Types +*****************************************************************/ +#if defined (__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */) +# if defined(_AIX) +# include +# else +# include /* intptr_t */ +# endif + typedef uint8_t BYTE; + typedef uint16_t U16; + typedef int16_t S16; + typedef uint32_t U32; + typedef int32_t S32; + typedef uint64_t U64; + typedef int64_t S64; +#else + typedef unsigned char BYTE; + typedef unsigned short U16; + typedef signed short S16; + typedef unsigned int U32; + typedef signed int S32; + typedef unsigned long long U64; + typedef signed long long S64; +#endif + + +/**************************************************************** +* Memory I/O +*****************************************************************/ +/* MEM_FORCE_MEMORY_ACCESS + * By default, access to unaligned memory is controlled by `memcpy()`, which is safe and portable. + * Unfortunately, on some target/compiler combinations, the generated assembly is sub-optimal. + * The below switch allow to select different access method for improved performance. + * Method 0 (default) : use `memcpy()`. Safe and portable. + * Method 1 : `__packed` statement. It depends on compiler extension (ie, not portable). + * This method is safe if your compiler supports it, and *generally* as fast or faster than `memcpy`. + * Method 2 : direct access. This method is portable but violate C standard. + * It can generate buggy code on targets generating assembly depending on alignment. + * But in some circumstances, it's the only known way to get the most performance (ie GCC + ARMv6) + * See http://fastcompression.blogspot.fr/2015/08/accessing-unaligned-memory.html for details. + * Prefer these methods in priority order (0 > 1 > 2) + */ +#ifndef MEM_FORCE_MEMORY_ACCESS /* can be defined externally, on command line for example */ +# if defined(__GNUC__) && ( defined(__ARM_ARCH_6__) || defined(__ARM_ARCH_6J__) || defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6Z__) || defined(__ARM_ARCH_6ZK__) || defined(__ARM_ARCH_6T2__) ) +# define MEM_FORCE_MEMORY_ACCESS 2 +# elif (defined(__INTEL_COMPILER) && !defined(WIN32)) || \ + (defined(__GNUC__) && ( defined(__ARM_ARCH_7__) || defined(__ARM_ARCH_7A__) || defined(__ARM_ARCH_7R__) || defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7S__) )) +# define MEM_FORCE_MEMORY_ACCESS 1 +# endif +#endif + +MEM_STATIC unsigned MEM_32bits(void) { return sizeof(void*)==4; } +MEM_STATIC unsigned MEM_64bits(void) { return sizeof(void*)==8; } + +MEM_STATIC unsigned MEM_isLittleEndian(void) +{ + const union { U32 u; BYTE c[4]; } one = { 1 }; /* don't use static : performance detrimental */ + return one.c[0]; +} + +#if defined(MEM_FORCE_MEMORY_ACCESS) && (MEM_FORCE_MEMORY_ACCESS==2) + +/* violates C standard on structure alignment. +Only use if no other choice to achieve best performance on target platform */ +MEM_STATIC U16 MEM_read16(const void* memPtr) { return *(const U16*) memPtr; } +MEM_STATIC U32 MEM_read32(const void* memPtr) { return *(const U32*) memPtr; } +MEM_STATIC U64 MEM_read64(const void* memPtr) { return *(const U64*) memPtr; } + +MEM_STATIC void MEM_write16(void* memPtr, U16 value) { *(U16*)memPtr = value; } + +#elif defined(MEM_FORCE_MEMORY_ACCESS) && (MEM_FORCE_MEMORY_ACCESS==1) + +/* __pack instructions are safer, but compiler specific, hence potentially problematic for some compilers */ +/* currently only defined for gcc and icc */ +typedef union { U16 u16; U32 u32; U64 u64; } __attribute__((packed)) unalign; + +MEM_STATIC U16 MEM_read16(const void* ptr) { return ((const unalign*)ptr)->u16; } +MEM_STATIC U32 MEM_read32(const void* ptr) { return ((const unalign*)ptr)->u32; } +MEM_STATIC U64 MEM_read64(const void* ptr) { return ((const unalign*)ptr)->u64; } + +MEM_STATIC void MEM_write16(void* memPtr, U16 value) { ((unalign*)memPtr)->u16 = value; } + +#else + +/* default method, safe and standard. + can sometimes prove slower */ + +MEM_STATIC U16 MEM_read16(const void* memPtr) +{ + U16 val; memcpy(&val, memPtr, sizeof(val)); return val; +} + +MEM_STATIC U32 MEM_read32(const void* memPtr) +{ + U32 val; memcpy(&val, memPtr, sizeof(val)); return val; +} + +MEM_STATIC U64 MEM_read64(const void* memPtr) +{ + U64 val; memcpy(&val, memPtr, sizeof(val)); return val; +} + +MEM_STATIC void MEM_write16(void* memPtr, U16 value) +{ + memcpy(memPtr, &value, sizeof(value)); +} + +#endif /* MEM_FORCE_MEMORY_ACCESS */ + + +MEM_STATIC U16 MEM_readLE16(const void* memPtr) +{ + if (MEM_isLittleEndian()) + return MEM_read16(memPtr); + else + { + const BYTE* p = (const BYTE*)memPtr; + return (U16)(p[0] + (p[1]<<8)); + } +} + +MEM_STATIC void MEM_writeLE16(void* memPtr, U16 val) +{ + if (MEM_isLittleEndian()) + { + MEM_write16(memPtr, val); + } + else + { + BYTE* p = (BYTE*)memPtr; + p[0] = (BYTE)val; + p[1] = (BYTE)(val>>8); + } +} + +MEM_STATIC U32 MEM_readLE24(const void* memPtr) +{ + return MEM_readLE16(memPtr) + (((const BYTE*)memPtr)[2] << 16); +} + +MEM_STATIC U32 MEM_readLE32(const void* memPtr) +{ + if (MEM_isLittleEndian()) + return MEM_read32(memPtr); + else + { + const BYTE* p = (const BYTE*)memPtr; + return (U32)((U32)p[0] + ((U32)p[1]<<8) + ((U32)p[2]<<16) + ((U32)p[3]<<24)); + } +} + + +MEM_STATIC U64 MEM_readLE64(const void* memPtr) +{ + if (MEM_isLittleEndian()) + return MEM_read64(memPtr); + else + { + const BYTE* p = (const BYTE*)memPtr; + return (U64)((U64)p[0] + ((U64)p[1]<<8) + ((U64)p[2]<<16) + ((U64)p[3]<<24) + + ((U64)p[4]<<32) + ((U64)p[5]<<40) + ((U64)p[6]<<48) + ((U64)p[7]<<56)); + } +} + + +MEM_STATIC size_t MEM_readLEST(const void* memPtr) +{ + if (MEM_32bits()) + return (size_t)MEM_readLE32(memPtr); + else + return (size_t)MEM_readLE64(memPtr); +} + +#if defined (__cplusplus) +} +#endif + +#endif /* MEM_H_MODULE */ + + +/* ****************************************************************** + bitstream + Part of NewGen Entropy library + header file (to include) + Copyright (C) 2013-2015, Yann Collet. + + BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions are + met: + + * Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + * Redistributions in binary form must reproduce the above + copyright notice, this list of conditions and the following disclaimer + in the documentation and/or other materials provided with the + distribution. + + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + + You can contact the author at : + - Source repository : https://github.com/Cyan4973/FiniteStateEntropy + - Public forum : https://groups.google.com/forum/#!forum/lz4c +****************************************************************** */ +#ifndef BITSTREAM_H_MODULE +#define BITSTREAM_H_MODULE + +#if defined (__cplusplus) +extern "C" { +#endif + + +/* +* This API consists of small unitary functions, which highly benefit from being inlined. +* Since link-time-optimization is not available for all compilers, +* these functions are defined into a .h to be included. +*/ + + +/********************************************** +* bitStream decompression API (read backward) +**********************************************/ +typedef struct +{ + size_t bitContainer; + unsigned bitsConsumed; + const char* ptr; + const char* start; +} BIT_DStream_t; + +typedef enum { BIT_DStream_unfinished = 0, + BIT_DStream_endOfBuffer = 1, + BIT_DStream_completed = 2, + BIT_DStream_overflow = 3 } BIT_DStream_status; /* result of BIT_reloadDStream() */ + /* 1,2,4,8 would be better for bitmap combinations, but slows down performance a bit ... :( */ + +MEM_STATIC size_t BIT_initDStream(BIT_DStream_t* bitD, const void* srcBuffer, size_t srcSize); +MEM_STATIC size_t BIT_readBits(BIT_DStream_t* bitD, unsigned nbBits); +MEM_STATIC BIT_DStream_status BIT_reloadDStream(BIT_DStream_t* bitD); +MEM_STATIC unsigned BIT_endOfDStream(const BIT_DStream_t* bitD); + + +/****************************************** +* unsafe API +******************************************/ +MEM_STATIC size_t BIT_readBitsFast(BIT_DStream_t* bitD, unsigned nbBits); +/* faster, but works only if nbBits >= 1 */ + + + +/**************************************************************** +* Helper functions +****************************************************************/ +MEM_STATIC unsigned BIT_highbit32 (U32 val) +{ +# if defined(_MSC_VER) /* Visual */ + unsigned long r=0; + _BitScanReverse ( &r, val ); + return (unsigned) r; +# elif defined(__GNUC__) && (__GNUC__ >= 3) /* Use GCC Intrinsic */ + return __builtin_clz (val) ^ 31; +# else /* Software version */ + static const unsigned DeBruijnClz[32] = { 0, 9, 1, 10, 13, 21, 2, 29, 11, 14, 16, 18, 22, 25, 3, 30, 8, 12, 20, 28, 15, 17, 24, 7, 19, 27, 23, 6, 26, 5, 4, 31 }; + U32 v = val; + unsigned r; + v |= v >> 1; + v |= v >> 2; + v |= v >> 4; + v |= v >> 8; + v |= v >> 16; + r = DeBruijnClz[ (U32) (v * 0x07C4ACDDU) >> 27]; + return r; +# endif +} + + + +/********************************************************** +* bitStream decoding +**********************************************************/ + +/*!BIT_initDStream +* Initialize a BIT_DStream_t. +* @bitD : a pointer to an already allocated BIT_DStream_t structure +* @srcBuffer must point at the beginning of a bitStream +* @srcSize must be the exact size of the bitStream +* @result : size of stream (== srcSize) or an errorCode if a problem is detected +*/ +MEM_STATIC size_t BIT_initDStream(BIT_DStream_t* bitD, const void* srcBuffer, size_t srcSize) +{ + if (srcSize < 1) { memset(bitD, 0, sizeof(*bitD)); return ERROR(srcSize_wrong); } + + if (srcSize >= sizeof(size_t)) /* normal case */ + { + U32 contain32; + bitD->start = (const char*)srcBuffer; + bitD->ptr = (const char*)srcBuffer + srcSize - sizeof(size_t); + bitD->bitContainer = MEM_readLEST(bitD->ptr); + contain32 = ((const BYTE*)srcBuffer)[srcSize-1]; + if (contain32 == 0) return ERROR(GENERIC); /* endMark not present */ + bitD->bitsConsumed = 8 - BIT_highbit32(contain32); + } + else + { + U32 contain32; + bitD->start = (const char*)srcBuffer; + bitD->ptr = bitD->start; + bitD->bitContainer = *(const BYTE*)(bitD->start); + switch(srcSize) + { + case 7: bitD->bitContainer += (size_t)(((const BYTE*)(bitD->start))[6]) << (sizeof(size_t)*8 - 16); + /* fallthrough */ + case 6: bitD->bitContainer += (size_t)(((const BYTE*)(bitD->start))[5]) << (sizeof(size_t)*8 - 24); + /* fallthrough */ + case 5: bitD->bitContainer += (size_t)(((const BYTE*)(bitD->start))[4]) << (sizeof(size_t)*8 - 32); + /* fallthrough */ + case 4: bitD->bitContainer += (size_t)(((const BYTE*)(bitD->start))[3]) << 24; + /* fallthrough */ + case 3: bitD->bitContainer += (size_t)(((const BYTE*)(bitD->start))[2]) << 16; + /* fallthrough */ + case 2: bitD->bitContainer += (size_t)(((const BYTE*)(bitD->start))[1]) << 8; + /* fallthrough */ + default:; + } + contain32 = ((const BYTE*)srcBuffer)[srcSize-1]; + if (contain32 == 0) return ERROR(GENERIC); /* endMark not present */ + bitD->bitsConsumed = 8 - BIT_highbit32(contain32); + bitD->bitsConsumed += (U32)(sizeof(size_t) - srcSize)*8; + } + + return srcSize; +} + +MEM_STATIC size_t BIT_lookBits(BIT_DStream_t* bitD, U32 nbBits) +{ + const U32 bitMask = sizeof(bitD->bitContainer)*8 - 1; + return ((bitD->bitContainer << (bitD->bitsConsumed & bitMask)) >> 1) >> ((bitMask-nbBits) & bitMask); +} + +/*! BIT_lookBitsFast : +* unsafe version; only works only if nbBits >= 1 */ +MEM_STATIC size_t BIT_lookBitsFast(BIT_DStream_t* bitD, U32 nbBits) +{ + const U32 bitMask = sizeof(bitD->bitContainer)*8 - 1; + return (bitD->bitContainer << (bitD->bitsConsumed & bitMask)) >> (((bitMask+1)-nbBits) & bitMask); +} + +MEM_STATIC void BIT_skipBits(BIT_DStream_t* bitD, U32 nbBits) +{ + bitD->bitsConsumed += nbBits; +} + +MEM_STATIC size_t BIT_readBits(BIT_DStream_t* bitD, U32 nbBits) +{ + size_t value = BIT_lookBits(bitD, nbBits); + BIT_skipBits(bitD, nbBits); + return value; +} + +/*!BIT_readBitsFast : +* unsafe version; only works only if nbBits >= 1 */ +MEM_STATIC size_t BIT_readBitsFast(BIT_DStream_t* bitD, U32 nbBits) +{ + size_t value = BIT_lookBitsFast(bitD, nbBits); + BIT_skipBits(bitD, nbBits); + return value; +} + +MEM_STATIC BIT_DStream_status BIT_reloadDStream(BIT_DStream_t* bitD) +{ + if (bitD->bitsConsumed > (sizeof(bitD->bitContainer)*8)) /* should never happen */ + return BIT_DStream_overflow; + + if (bitD->ptr >= bitD->start + sizeof(bitD->bitContainer)) + { + bitD->ptr -= bitD->bitsConsumed >> 3; + bitD->bitsConsumed &= 7; + bitD->bitContainer = MEM_readLEST(bitD->ptr); + return BIT_DStream_unfinished; + } + if (bitD->ptr == bitD->start) + { + if (bitD->bitsConsumed < sizeof(bitD->bitContainer)*8) return BIT_DStream_endOfBuffer; + return BIT_DStream_completed; + } + { + U32 nbBytes = bitD->bitsConsumed >> 3; + BIT_DStream_status result = BIT_DStream_unfinished; + if (bitD->ptr - nbBytes < bitD->start) + { + nbBytes = (U32)(bitD->ptr - bitD->start); /* ptr > start */ + result = BIT_DStream_endOfBuffer; + } + bitD->ptr -= nbBytes; + bitD->bitsConsumed -= nbBytes*8; + bitD->bitContainer = MEM_readLEST(bitD->ptr); /* reminder : srcSize > sizeof(bitD) */ + return result; + } +} + +/*! BIT_endOfDStream +* @return Tells if DStream has reached its exact end +*/ +MEM_STATIC unsigned BIT_endOfDStream(const BIT_DStream_t* DStream) +{ + return ((DStream->ptr == DStream->start) && (DStream->bitsConsumed == sizeof(DStream->bitContainer)*8)); +} + +#if defined (__cplusplus) +} +#endif + +#endif /* BITSTREAM_H_MODULE */ +/* ****************************************************************** + Error codes and messages + Copyright (C) 2013-2015, Yann Collet + + BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions are + met: + + * Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + * Redistributions in binary form must reproduce the above + copyright notice, this list of conditions and the following disclaimer + in the documentation and/or other materials provided with the + distribution. + + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + + You can contact the author at : + - Source repository : https://github.com/Cyan4973/FiniteStateEntropy + - Public forum : https://groups.google.com/forum/#!forum/lz4c +****************************************************************** */ +#ifndef ERROR_H_MODULE +#define ERROR_H_MODULE + +#if defined (__cplusplus) +extern "C" { +#endif + + +/****************************************** +* Compiler-specific +******************************************/ +#if defined (__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */) +# define ERR_STATIC static inline +#elif defined(_MSC_VER) +# define ERR_STATIC static __inline +#elif defined(__GNUC__) +# define ERR_STATIC static __attribute__((unused)) +#else +# define ERR_STATIC static /* this version may generate warnings for unused static functions; disable the relevant warning */ +#endif + + +/****************************************** +* Error Management +******************************************/ +#define PREFIX(name) ZSTD_error_##name + +#define ERROR(name) (size_t)-PREFIX(name) + +#define ERROR_LIST(ITEM) \ + ITEM(PREFIX(No_Error)) ITEM(PREFIX(GENERIC)) \ + ITEM(PREFIX(dstSize_tooSmall)) ITEM(PREFIX(srcSize_wrong)) \ + ITEM(PREFIX(prefix_unknown)) ITEM(PREFIX(corruption_detected)) \ + ITEM(PREFIX(tableLog_tooLarge)) ITEM(PREFIX(maxSymbolValue_tooLarge)) ITEM(PREFIX(maxSymbolValue_tooSmall)) \ + ITEM(PREFIX(maxCode)) + +#define ERROR_GENERATE_ENUM(ENUM) ENUM, +typedef enum { ERROR_LIST(ERROR_GENERATE_ENUM) } ERR_codes; /* enum is exposed, to detect & handle specific errors; compare function result to -enum value */ + +#define ERROR_CONVERTTOSTRING(STRING) #STRING, +#define ERROR_GENERATE_STRING(EXPR) ERROR_CONVERTTOSTRING(EXPR) +static const char* ERR_strings[] = { ERROR_LIST(ERROR_GENERATE_STRING) }; + +ERR_STATIC unsigned ERR_isError(size_t code) { return (code > ERROR(maxCode)); } + +ERR_STATIC const char* ERR_getErrorName(size_t code) +{ + static const char* codeError = "Unspecified error code"; + if (ERR_isError(code)) return ERR_strings[-(int)(code)]; + return codeError; +} + + +#if defined (__cplusplus) +} +#endif + +#endif /* ERROR_H_MODULE */ +/* +Constructor and Destructor of type FSE_CTable + Note that its size depends on 'tableLog' and 'maxSymbolValue' */ +typedef unsigned FSE_CTable; /* don't allocate that. It's just a way to be more restrictive than void* */ +typedef unsigned FSE_DTable; /* don't allocate that. It's just a way to be more restrictive than void* */ + + +/* ****************************************************************** + FSE : Finite State Entropy coder + header file for static linking (only) + Copyright (C) 2013-2015, Yann Collet + + BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions are + met: + + * Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + * Redistributions in binary form must reproduce the above + copyright notice, this list of conditions and the following disclaimer + in the documentation and/or other materials provided with the + distribution. + + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + + You can contact the author at : + - Source repository : https://github.com/Cyan4973/FiniteStateEntropy + - Public forum : https://groups.google.com/forum/#!forum/lz4c +****************************************************************** */ +#if defined (__cplusplus) +extern "C" { +#endif + + +/****************************************** +* Static allocation +******************************************/ +/* FSE buffer bounds */ +#define FSE_NCOUNTBOUND 512 +#define FSE_BLOCKBOUND(size) (size + (size>>7)) +#define FSE_COMPRESSBOUND(size) (FSE_NCOUNTBOUND + FSE_BLOCKBOUND(size)) /* Macro version, useful for static allocation */ + +/* You can statically allocate FSE CTable/DTable as a table of unsigned using below macro */ +#define FSE_CTABLE_SIZE_U32(maxTableLog, maxSymbolValue) (1 + (1<<(maxTableLog-1)) + ((maxSymbolValue+1)*2)) +#define FSE_DTABLE_SIZE_U32(maxTableLog) (1 + (1<= 1 (otherwise, result will be corrupted) */ + + +/****************************************** +* Implementation of inline functions +******************************************/ + +/* decompression */ + +typedef struct { + U16 tableLog; + U16 fastMode; +} FSE_DTableHeader; /* sizeof U32 */ + +typedef struct +{ + unsigned short newState; + unsigned char symbol; + unsigned char nbBits; +} FSE_decode_t; /* size == U32 */ + +MEM_STATIC void FSE_initDState(FSE_DState_t* DStatePtr, BIT_DStream_t* bitD, const FSE_DTable* dt) +{ + FSE_DTableHeader DTableH; + memcpy(&DTableH, dt, sizeof(DTableH)); + DStatePtr->state = BIT_readBits(bitD, DTableH.tableLog); + BIT_reloadDStream(bitD); + DStatePtr->table = dt + 1; +} + +MEM_STATIC BYTE FSE_decodeSymbol(FSE_DState_t* DStatePtr, BIT_DStream_t* bitD) +{ + const FSE_decode_t DInfo = ((const FSE_decode_t*)(DStatePtr->table))[DStatePtr->state]; + const U32 nbBits = DInfo.nbBits; + BYTE symbol = DInfo.symbol; + size_t lowBits = BIT_readBits(bitD, nbBits); + + DStatePtr->state = DInfo.newState + lowBits; + return symbol; +} + +MEM_STATIC BYTE FSE_decodeSymbolFast(FSE_DState_t* DStatePtr, BIT_DStream_t* bitD) +{ + const FSE_decode_t DInfo = ((const FSE_decode_t*)(DStatePtr->table))[DStatePtr->state]; + const U32 nbBits = DInfo.nbBits; + BYTE symbol = DInfo.symbol; + size_t lowBits = BIT_readBitsFast(bitD, nbBits); + + DStatePtr->state = DInfo.newState + lowBits; + return symbol; +} + +MEM_STATIC unsigned FSE_endOfDState(const FSE_DState_t* DStatePtr) +{ + return DStatePtr->state == 0; +} + + +#if defined (__cplusplus) +} +#endif +/* ****************************************************************** + Huff0 : Huffman coder, part of New Generation Entropy library + header file for static linking (only) + Copyright (C) 2013-2015, Yann Collet + + BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions are + met: + + * Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + * Redistributions in binary form must reproduce the above + copyright notice, this list of conditions and the following disclaimer + in the documentation and/or other materials provided with the + distribution. + + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + + You can contact the author at : + - Source repository : https://github.com/Cyan4973/FiniteStateEntropy + - Public forum : https://groups.google.com/forum/#!forum/lz4c +****************************************************************** */ + +#if defined (__cplusplus) +extern "C" { +#endif + +/****************************************** +* Static allocation macros +******************************************/ +/* Huff0 buffer bounds */ +#define HUF_CTABLEBOUND 129 +#define HUF_BLOCKBOUND(size) (size + (size>>8) + 8) /* only true if incompressible pre-filtered with fast heuristic */ +#define HUF_COMPRESSBOUND(size) (HUF_CTABLEBOUND + HUF_BLOCKBOUND(size)) /* Macro version, useful for static allocation */ + +/* static allocation of Huff0's DTable */ +#define HUF_DTABLE_SIZE(maxTableLog) (1 + (1< /* size_t */ + + +/* ************************************* +* Version +***************************************/ +#define ZSTD_VERSION_MAJOR 0 /* for breaking interface changes */ +#define ZSTD_VERSION_MINOR 2 /* for new (non-breaking) interface capabilities */ +#define ZSTD_VERSION_RELEASE 2 /* for tweaks, bug-fixes, or development */ +#define ZSTD_VERSION_NUMBER (ZSTD_VERSION_MAJOR *100*100 + ZSTD_VERSION_MINOR *100 + ZSTD_VERSION_RELEASE) + + +/* ************************************* +* Advanced functions +***************************************/ +typedef struct ZSTD_CCtx_s ZSTD_CCtx; /* incomplete type */ + +#if defined (__cplusplus) +} +#endif +/* + zstd - standard compression library + Header File for static linking only + Copyright (C) 2014-2015, Yann Collet. + + BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions are + met: + * Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + * Redistributions in binary form must reproduce the above + copyright notice, this list of conditions and the following disclaimer + in the documentation and/or other materials provided with the + distribution. + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + + You can contact the author at : + - zstd source repository : https://github.com/Cyan4973/zstd + - ztsd public forum : https://groups.google.com/forum/#!forum/lz4c +*/ + +/* The objects defined into this file should be considered experimental. + * They are not labelled stable, as their prototype may change in the future. + * You can use them for tests, provide feedback, or if you can endure risk of future changes. + */ + +#if defined (__cplusplus) +extern "C" { +#endif + +/* ************************************* +* Streaming functions +***************************************/ + +typedef struct ZSTD_DCtx_s ZSTD_DCtx; + +/* + Use above functions alternatively. + ZSTD_nextSrcSizeToDecompress() tells how much bytes to provide as 'srcSize' to ZSTD_decompressContinue(). + ZSTD_decompressContinue() will use previous data blocks to improve compression if they are located prior to current block. + Result is the number of bytes regenerated within 'dst'. + It can be zero, which is not an error; it just means ZSTD_decompressContinue() has decoded some header. +*/ + +/* ************************************* +* Prefix - version detection +***************************************/ +#define ZSTD_magicNumber 0xFD2FB522 /* v0.2 (current)*/ + + +#if defined (__cplusplus) +} +#endif +/* ****************************************************************** + FSE : Finite State Entropy coder + Copyright (C) 2013-2015, Yann Collet. + + BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions are + met: + + * Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + * Redistributions in binary form must reproduce the above + copyright notice, this list of conditions and the following disclaimer + in the documentation and/or other materials provided with the + distribution. + + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + + You can contact the author at : + - FSE source repository : https://github.com/Cyan4973/FiniteStateEntropy + - Public forum : https://groups.google.com/forum/#!forum/lz4c +****************************************************************** */ + +#ifndef FSE_COMMONDEFS_ONLY + +/**************************************************************** +* Tuning parameters +****************************************************************/ +/* MEMORY_USAGE : +* Memory usage formula : N->2^N Bytes (examples : 10 -> 1KB; 12 -> 4KB ; 16 -> 64KB; 20 -> 1MB; etc.) +* Increasing memory usage improves compression ratio +* Reduced memory usage can improve speed, due to cache effect +* Recommended max value is 14, for 16KB, which nicely fits into Intel x86 L1 cache */ +#define FSE_MAX_MEMORY_USAGE 14 +#define FSE_DEFAULT_MEMORY_USAGE 13 + +/* FSE_MAX_SYMBOL_VALUE : +* Maximum symbol value authorized. +* Required for proper stack allocation */ +#define FSE_MAX_SYMBOL_VALUE 255 + + +/**************************************************************** +* template functions type & suffix +****************************************************************/ +#define FSE_FUNCTION_TYPE BYTE +#define FSE_FUNCTION_EXTENSION + + +/**************************************************************** +* Byte symbol type +****************************************************************/ +#endif /* !FSE_COMMONDEFS_ONLY */ + + +/**************************************************************** +* Compiler specifics +****************************************************************/ +#ifdef _MSC_VER /* Visual Studio */ +# define FORCE_INLINE static __forceinline +# include /* For Visual 2005 */ +# pragma warning(disable : 4127) /* disable: C4127: conditional expression is constant */ +# pragma warning(disable : 4214) /* disable: C4214: non-int bitfields */ +#else +# if defined (__cplusplus) || defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L /* C99 */ +# ifdef __GNUC__ +# define FORCE_INLINE static inline __attribute__((always_inline)) +# else +# define FORCE_INLINE static inline +# endif +# else +# define FORCE_INLINE static +# endif /* __STDC_VERSION__ */ +#endif + + +/**************************************************************** +* Includes +****************************************************************/ +#include /* malloc, free, qsort */ +#include /* memcpy, memset */ +#include /* printf (debug) */ + +/**************************************************************** +* Constants +*****************************************************************/ +#define FSE_MAX_TABLELOG (FSE_MAX_MEMORY_USAGE-2) +#define FSE_MAX_TABLESIZE (1U< FSE_TABLELOG_ABSOLUTE_MAX +#error "FSE_MAX_TABLELOG > FSE_TABLELOG_ABSOLUTE_MAX is not supported" +#endif + + +/**************************************************************** +* Error Management +****************************************************************/ +#define FSE_STATIC_ASSERT(c) { enum { FSE_static_assert = 1/(int)(!!(c)) }; } /* use only *after* variable declarations */ + + +/**************************************************************** +* Complex types +****************************************************************/ +typedef U32 DTable_max_t[FSE_DTABLE_SIZE_U32(FSE_MAX_TABLELOG)]; + + +/**************************************************************** +* Templates +****************************************************************/ +/* + designed to be included + for type-specific functions (template emulation in C) + Objective is to write these functions only once, for improved maintenance +*/ + +/* safety checks */ +#ifndef FSE_FUNCTION_EXTENSION +# error "FSE_FUNCTION_EXTENSION must be defined" +#endif +#ifndef FSE_FUNCTION_TYPE +# error "FSE_FUNCTION_TYPE must be defined" +#endif + +/* Function names */ +#define FSE_CAT(X,Y) X##Y +#define FSE_FUNCTION_NAME(X,Y) FSE_CAT(X,Y) +#define FSE_TYPE_NAME(X,Y) FSE_CAT(X,Y) + + +/* Function templates */ + +#define FSE_DECODE_TYPE FSE_decode_t + +static U32 FSE_tableStep(U32 tableSize) { return (tableSize>>1) + (tableSize>>3) + 3; } + +static size_t FSE_buildDTable +(FSE_DTable* dt, const short* normalizedCounter, unsigned maxSymbolValue, unsigned tableLog) +{ + void* ptr = dt+1; + FSE_DECODE_TYPE* const tableDecode = (FSE_DECODE_TYPE*)ptr; + FSE_DTableHeader DTableH; + const U32 tableSize = 1 << tableLog; + const U32 tableMask = tableSize-1; + const U32 step = FSE_tableStep(tableSize); + U16 symbolNext[FSE_MAX_SYMBOL_VALUE+1]; + U32 position = 0; + U32 highThreshold = tableSize-1; + const S16 largeLimit= (S16)(1 << (tableLog-1)); + U32 noLarge = 1; + U32 s; + + /* Sanity Checks */ + if (maxSymbolValue > FSE_MAX_SYMBOL_VALUE) return ERROR(maxSymbolValue_tooLarge); + if (tableLog > FSE_MAX_TABLELOG) return ERROR(tableLog_tooLarge); + + /* Init, lay down lowprob symbols */ + DTableH.tableLog = (U16)tableLog; + for (s=0; s<=maxSymbolValue; s++) + { + if (normalizedCounter[s]==-1) + { + tableDecode[highThreshold--].symbol = (FSE_FUNCTION_TYPE)s; + symbolNext[s] = 1; + } + else + { + if (normalizedCounter[s] >= largeLimit) noLarge=0; + symbolNext[s] = normalizedCounter[s]; + } + } + + /* Spread symbols */ + for (s=0; s<=maxSymbolValue; s++) + { + int i; + for (i=0; i highThreshold) position = (position + step) & tableMask; /* lowprob area */ + } + } + + if (position!=0) return ERROR(GENERIC); /* position must reach all cells once, otherwise normalizedCounter is incorrect */ + + /* Build Decoding table */ + { + U32 i; + for (i=0; i FSE_TABLELOG_ABSOLUTE_MAX) return ERROR(tableLog_tooLarge); + bitStream >>= 4; + bitCount = 4; + *tableLogPtr = nbBits; + remaining = (1<1) && (charnum<=*maxSVPtr)) + { + if (previous0) + { + unsigned n0 = charnum; + while ((bitStream & 0xFFFF) == 0xFFFF) + { + n0+=24; + if (ip < iend-5) + { + ip+=2; + bitStream = MEM_readLE32(ip) >> bitCount; + } + else + { + bitStream >>= 16; + bitCount+=16; + } + } + while ((bitStream & 3) == 3) + { + n0+=3; + bitStream>>=2; + bitCount+=2; + } + n0 += bitStream & 3; + bitCount += 2; + if (n0 > *maxSVPtr) return ERROR(maxSymbolValue_tooSmall); + while (charnum < n0) normalizedCounter[charnum++] = 0; + if ((ip <= iend-7) || (ip + (bitCount>>3) <= iend-4)) + { + ip += bitCount>>3; + bitCount &= 7; + bitStream = MEM_readLE32(ip) >> bitCount; + } + else + bitStream >>= 2; + } + { + const short max = (short)((2*threshold-1)-remaining); + short count; + + if ((bitStream & (threshold-1)) < (U32)max) + { + count = (short)(bitStream & (threshold-1)); + bitCount += nbBits-1; + } + else + { + count = (short)(bitStream & (2*threshold-1)); + if (count >= threshold) count -= max; + bitCount += nbBits; + } + + count--; /* extra accuracy */ + remaining -= FSE_abs(count); + normalizedCounter[charnum++] = count; + previous0 = !count; + while (remaining < threshold) + { + nbBits--; + threshold >>= 1; + } + + { + if ((ip <= iend-7) || (ip + (bitCount>>3) <= iend-4)) + { + ip += bitCount>>3; + bitCount &= 7; + } + else + { + bitCount -= (int)(8 * (iend - 4 - ip)); + ip = iend - 4; + } + bitStream = MEM_readLE32(ip) >> (bitCount & 31); + } + } + } + if (remaining != 1) return ERROR(GENERIC); + *maxSVPtr = charnum-1; + + ip += (bitCount+7)>>3; + if ((size_t)(ip-istart) > hbSize) return ERROR(srcSize_wrong); + return ip-istart; +} + + +/********************************************************* +* Decompression (Byte symbols) +*********************************************************/ +static size_t FSE_buildDTable_rle (FSE_DTable* dt, BYTE symbolValue) +{ + void* ptr = dt; + FSE_DTableHeader* const DTableH = (FSE_DTableHeader*)ptr; + FSE_decode_t* const cell = (FSE_decode_t*)(ptr) + 1; /* because dt is unsigned */ + + DTableH->tableLog = 0; + DTableH->fastMode = 0; + + cell->newState = 0; + cell->symbol = symbolValue; + cell->nbBits = 0; + + return 0; +} + + +static size_t FSE_buildDTable_raw (FSE_DTable* dt, unsigned nbBits) +{ + void* ptr = dt; + FSE_DTableHeader* const DTableH = (FSE_DTableHeader*)ptr; + FSE_decode_t* const dinfo = (FSE_decode_t*)(ptr) + 1; /* because dt is unsigned */ + const unsigned tableSize = 1 << nbBits; + const unsigned tableMask = tableSize - 1; + const unsigned maxSymbolValue = tableMask; + unsigned s; + + /* Sanity checks */ + if (nbBits < 1) return ERROR(GENERIC); /* min size */ + + /* Build Decoding Table */ + DTableH->tableLog = (U16)nbBits; + DTableH->fastMode = 1; + for (s=0; s<=maxSymbolValue; s++) + { + dinfo[s].newState = 0; + dinfo[s].symbol = (BYTE)s; + dinfo[s].nbBits = (BYTE)nbBits; + } + + return 0; +} + +FORCE_INLINE size_t FSE_decompress_usingDTable_generic( + void* dst, size_t maxDstSize, + const void* cSrc, size_t cSrcSize, + const FSE_DTable* dt, const unsigned fast) +{ + BYTE* const ostart = (BYTE*) dst; + BYTE* op = ostart; + BYTE* const omax = op + maxDstSize; + BYTE* const olimit = omax-3; + + BIT_DStream_t bitD; + FSE_DState_t state1; + FSE_DState_t state2; + size_t errorCode; + + /* Init */ + errorCode = BIT_initDStream(&bitD, cSrc, cSrcSize); /* replaced last arg by maxCompressed Size */ + if (FSE_isError(errorCode)) return errorCode; + + FSE_initDState(&state1, &bitD, dt); + FSE_initDState(&state2, &bitD, dt); + +#define FSE_GETSYMBOL(statePtr) fast ? FSE_decodeSymbolFast(statePtr, &bitD) : FSE_decodeSymbol(statePtr, &bitD) + + /* 4 symbols per loop */ + for ( ; (BIT_reloadDStream(&bitD)==BIT_DStream_unfinished) && (op sizeof(bitD.bitContainer)*8) /* This test must be static */ + BIT_reloadDStream(&bitD); + + op[1] = FSE_GETSYMBOL(&state2); + + if (FSE_MAX_TABLELOG*4+7 > sizeof(bitD.bitContainer)*8) /* This test must be static */ + { if (BIT_reloadDStream(&bitD) > BIT_DStream_unfinished) { op+=2; break; } } + + op[2] = FSE_GETSYMBOL(&state1); + + if (FSE_MAX_TABLELOG*2+7 > sizeof(bitD.bitContainer)*8) /* This test must be static */ + BIT_reloadDStream(&bitD); + + op[3] = FSE_GETSYMBOL(&state2); + } + + /* tail */ + /* note : BIT_reloadDStream(&bitD) >= FSE_DStream_partiallyFilled; Ends at exactly BIT_DStream_completed */ + while (1) + { + if ( (BIT_reloadDStream(&bitD)>BIT_DStream_completed) || (op==omax) || (BIT_endOfDStream(&bitD) && (fast || FSE_endOfDState(&state1))) ) + break; + + *op++ = FSE_GETSYMBOL(&state1); + + if ( (BIT_reloadDStream(&bitD)>BIT_DStream_completed) || (op==omax) || (BIT_endOfDStream(&bitD) && (fast || FSE_endOfDState(&state2))) ) + break; + + *op++ = FSE_GETSYMBOL(&state2); + } + + /* end ? */ + if (BIT_endOfDStream(&bitD) && FSE_endOfDState(&state1) && FSE_endOfDState(&state2)) + return op-ostart; + + if (op==omax) return ERROR(dstSize_tooSmall); /* dst buffer is full, but cSrc unfinished */ + + return ERROR(corruption_detected); +} + + +static size_t FSE_decompress_usingDTable(void* dst, size_t originalSize, + const void* cSrc, size_t cSrcSize, + const FSE_DTable* dt) +{ + FSE_DTableHeader DTableH; + memcpy(&DTableH, dt, sizeof(DTableH)); + + /* select fast mode (static) */ + if (DTableH.fastMode) return FSE_decompress_usingDTable_generic(dst, originalSize, cSrc, cSrcSize, dt, 1); + return FSE_decompress_usingDTable_generic(dst, originalSize, cSrc, cSrcSize, dt, 0); +} + + +static size_t FSE_decompress(void* dst, size_t maxDstSize, const void* cSrc, size_t cSrcSize) +{ + const BYTE* const istart = (const BYTE*)cSrc; + const BYTE* ip = istart; + short counting[FSE_MAX_SYMBOL_VALUE+1]; + DTable_max_t dt; /* Static analyzer seems unable to understand this table will be properly initialized later */ + unsigned tableLog; + unsigned maxSymbolValue = FSE_MAX_SYMBOL_VALUE; + size_t errorCode; + + if (cSrcSize<2) return ERROR(srcSize_wrong); /* too small input size */ + + /* normal FSE decoding mode */ + errorCode = FSE_readNCount (counting, &maxSymbolValue, &tableLog, istart, cSrcSize); + if (FSE_isError(errorCode)) return errorCode; + if (errorCode >= cSrcSize) return ERROR(srcSize_wrong); /* too small input size */ + ip += errorCode; + cSrcSize -= errorCode; + + errorCode = FSE_buildDTable (dt, counting, maxSymbolValue, tableLog); + if (FSE_isError(errorCode)) return errorCode; + + /* always return, even if it is an error code */ + return FSE_decompress_usingDTable (dst, maxDstSize, ip, cSrcSize, dt); +} + + + +#endif /* FSE_COMMONDEFS_ONLY */ +/* ****************************************************************** + Huff0 : Huffman coder, part of New Generation Entropy library + Copyright (C) 2013-2015, Yann Collet. + + BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions are + met: + + * Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + * Redistributions in binary form must reproduce the above + copyright notice, this list of conditions and the following disclaimer + in the documentation and/or other materials provided with the + distribution. + + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + + You can contact the author at : + - FSE+Huff0 source repository : https://github.com/Cyan4973/FiniteStateEntropy + - Public forum : https://groups.google.com/forum/#!forum/lz4c +****************************************************************** */ + +/**************************************************************** +* Compiler specifics +****************************************************************/ +#if defined (__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */) +/* inline is defined */ +#elif defined(_MSC_VER) +# define inline __inline +#else +# define inline /* disable inline */ +#endif + + +#ifdef _MSC_VER /* Visual Studio */ +# pragma warning(disable : 4127) /* disable: C4127: conditional expression is constant */ +#endif + + +/**************************************************************** +* Includes +****************************************************************/ +#include /* malloc, free, qsort */ +#include /* memcpy, memset */ +#include /* printf (debug) */ + +/**************************************************************** +* Error Management +****************************************************************/ +#define HUF_STATIC_ASSERT(c) { enum { HUF_static_assert = 1/(int)(!!(c)) }; } /* use only *after* variable declarations */ + + +/****************************************** +* Helper functions +******************************************/ +static unsigned HUF_isError(size_t code) { return ERR_isError(code); } + +#define HUF_ABSOLUTEMAX_TABLELOG 16 /* absolute limit of HUF_MAX_TABLELOG. Beyond that value, code does not work */ +#define HUF_MAX_TABLELOG 12 /* max configured tableLog (for static allocation); can be modified up to HUF_ABSOLUTEMAX_TABLELOG */ +#define HUF_DEFAULT_TABLELOG HUF_MAX_TABLELOG /* tableLog by default, when not specified */ +#define HUF_MAX_SYMBOL_VALUE 255 +#if (HUF_MAX_TABLELOG > HUF_ABSOLUTEMAX_TABLELOG) +# error "HUF_MAX_TABLELOG is too large !" +#endif + + + +/********************************************************* +* Huff0 : Huffman block decompression +*********************************************************/ +typedef struct { BYTE byte; BYTE nbBits; } HUF_DEltX2; /* single-symbol decoding */ + +typedef struct { U16 sequence; BYTE nbBits; BYTE length; } HUF_DEltX4; /* double-symbols decoding */ + +typedef struct { BYTE symbol; BYTE weight; } sortedSymbol_t; + +/*! HUF_readStats + Read compact Huffman tree, saved by HUF_writeCTable + @huffWeight : destination buffer + @return : size read from `src` +*/ +static size_t HUF_readStats(BYTE* huffWeight, size_t hwSize, U32* rankStats, + U32* nbSymbolsPtr, U32* tableLogPtr, + const void* src, size_t srcSize) +{ + U32 weightTotal; + U32 tableLog; + const BYTE* ip = (const BYTE*) src; + size_t iSize; + size_t oSize; + U32 n; + + if (!srcSize) return ERROR(srcSize_wrong); + iSize = ip[0]; + //memset(huffWeight, 0, hwSize); /* is not necessary, even though some analyzer complain ... */ + + if (iSize >= 128) /* special header */ + { + if (iSize >= (242)) /* RLE */ + { + static int l[14] = { 1, 2, 3, 4, 7, 8, 15, 16, 31, 32, 63, 64, 127, 128 }; + oSize = l[iSize-242]; + memset(huffWeight, 1, hwSize); + iSize = 0; + } + else /* Incompressible */ + { + oSize = iSize - 127; + iSize = ((oSize+1)/2); + if (iSize+1 > srcSize) return ERROR(srcSize_wrong); + if (oSize >= hwSize) return ERROR(corruption_detected); + ip += 1; + for (n=0; n> 4; + huffWeight[n+1] = ip[n/2] & 15; + } + } + } + else /* header compressed with FSE (normal case) */ + { + if (iSize+1 > srcSize) return ERROR(srcSize_wrong); + oSize = FSE_decompress(huffWeight, hwSize-1, ip+1, iSize); /* max (hwSize-1) values decoded, as last one is implied */ + if (FSE_isError(oSize)) return oSize; + } + + /* collect weight stats */ + memset(rankStats, 0, (HUF_ABSOLUTEMAX_TABLELOG + 1) * sizeof(U32)); + weightTotal = 0; + for (n=0; n= HUF_ABSOLUTEMAX_TABLELOG) return ERROR(corruption_detected); + rankStats[huffWeight[n]]++; + weightTotal += (1 << huffWeight[n]) >> 1; + } + if (weightTotal == 0) return ERROR(corruption_detected); + + /* get last non-null symbol weight (implied, total must be 2^n) */ + tableLog = BIT_highbit32(weightTotal) + 1; + if (tableLog > HUF_ABSOLUTEMAX_TABLELOG) return ERROR(corruption_detected); + { + U32 total = 1 << tableLog; + U32 rest = total - weightTotal; + U32 verif = 1 << BIT_highbit32(rest); + U32 lastWeight = BIT_highbit32(rest) + 1; + if (verif != rest) return ERROR(corruption_detected); /* last value must be a clean power of 2 */ + huffWeight[oSize] = (BYTE)lastWeight; + rankStats[lastWeight]++; + } + + /* check tree construction validity */ + if ((rankStats[1] < 2) || (rankStats[1] & 1)) return ERROR(corruption_detected); /* by construction : at least 2 elts of rank 1, must be even */ + + /* results */ + *nbSymbolsPtr = (U32)(oSize+1); + *tableLogPtr = tableLog; + return iSize+1; +} + + +/**************************/ +/* single-symbol decoding */ +/**************************/ + +static size_t HUF_readDTableX2 (U16* DTable, const void* src, size_t srcSize) +{ + BYTE huffWeight[HUF_MAX_SYMBOL_VALUE + 1]; + U32 rankVal[HUF_ABSOLUTEMAX_TABLELOG + 1]; /* large enough for values from 0 to 16 */ + U32 tableLog = 0; + const BYTE* ip = (const BYTE*) src; + size_t iSize = ip[0]; + U32 nbSymbols = 0; + U32 n; + U32 nextRankStart; + void* ptr = DTable+1; + HUF_DEltX2* const dt = (HUF_DEltX2*)ptr; + + HUF_STATIC_ASSERT(sizeof(HUF_DEltX2) == sizeof(U16)); /* if compilation fails here, assertion is false */ + //memset(huffWeight, 0, sizeof(huffWeight)); /* is not necessary, even though some analyzer complain ... */ + + iSize = HUF_readStats(huffWeight, HUF_MAX_SYMBOL_VALUE + 1, rankVal, &nbSymbols, &tableLog, src, srcSize); + if (HUF_isError(iSize)) return iSize; + + /* check result */ + if (tableLog > DTable[0]) return ERROR(tableLog_tooLarge); /* DTable is too small */ + DTable[0] = (U16)tableLog; /* maybe should separate sizeof DTable, as allocated, from used size of DTable, in case of DTable re-use */ + + /* Prepare ranks */ + nextRankStart = 0; + for (n=1; n<=tableLog; n++) + { + U32 current = nextRankStart; + nextRankStart += (rankVal[n] << (n-1)); + rankVal[n] = current; + } + + /* fill DTable */ + for (n=0; n> 1; + U32 i; + HUF_DEltX2 D; + D.byte = (BYTE)n; D.nbBits = (BYTE)(tableLog + 1 - w); + for (i = rankVal[w]; i < rankVal[w] + length; i++) + dt[i] = D; + rankVal[w] += length; + } + + return iSize; +} + +static BYTE HUF_decodeSymbolX2(BIT_DStream_t* Dstream, const HUF_DEltX2* dt, const U32 dtLog) +{ + const size_t val = BIT_lookBitsFast(Dstream, dtLog); /* note : dtLog >= 1 */ + const BYTE c = dt[val].byte; + BIT_skipBits(Dstream, dt[val].nbBits); + return c; +} + +#define HUF_DECODE_SYMBOLX2_0(ptr, DStreamPtr) \ + *ptr++ = HUF_decodeSymbolX2(DStreamPtr, dt, dtLog) + +#define HUF_DECODE_SYMBOLX2_1(ptr, DStreamPtr) \ + if (MEM_64bits() || (HUF_MAX_TABLELOG<=12)) \ + HUF_DECODE_SYMBOLX2_0(ptr, DStreamPtr) + +#define HUF_DECODE_SYMBOLX2_2(ptr, DStreamPtr) \ + if (MEM_64bits()) \ + HUF_DECODE_SYMBOLX2_0(ptr, DStreamPtr) + +static inline size_t HUF_decodeStreamX2(BYTE* p, BIT_DStream_t* const bitDPtr, BYTE* const pEnd, const HUF_DEltX2* const dt, const U32 dtLog) +{ + BYTE* const pStart = p; + + /* up to 4 symbols at a time */ + while ((BIT_reloadDStream(bitDPtr) == BIT_DStream_unfinished) && (p <= pEnd-4)) + { + HUF_DECODE_SYMBOLX2_2(p, bitDPtr); + HUF_DECODE_SYMBOLX2_1(p, bitDPtr); + HUF_DECODE_SYMBOLX2_2(p, bitDPtr); + HUF_DECODE_SYMBOLX2_0(p, bitDPtr); + } + + /* closer to the end */ + while ((BIT_reloadDStream(bitDPtr) == BIT_DStream_unfinished) && (p < pEnd)) + HUF_DECODE_SYMBOLX2_0(p, bitDPtr); + + /* no more data to retrieve from bitstream, hence no need to reload */ + while (p < pEnd) + HUF_DECODE_SYMBOLX2_0(p, bitDPtr); + + return pEnd-pStart; +} + + +static size_t HUF_decompress4X2_usingDTable( + void* dst, size_t dstSize, + const void* cSrc, size_t cSrcSize, + const U16* DTable) +{ + if (cSrcSize < 10) return ERROR(corruption_detected); /* strict minimum : jump table + 1 byte per stream */ + + { + const BYTE* const istart = (const BYTE*) cSrc; + BYTE* const ostart = (BYTE*) dst; + BYTE* const oend = ostart + dstSize; + + const void* ptr = DTable; + const HUF_DEltX2* const dt = ((const HUF_DEltX2*)ptr) +1; + const U32 dtLog = DTable[0]; + size_t errorCode; + + /* Init */ + BIT_DStream_t bitD1; + BIT_DStream_t bitD2; + BIT_DStream_t bitD3; + BIT_DStream_t bitD4; + const size_t length1 = MEM_readLE16(istart); + const size_t length2 = MEM_readLE16(istart+2); + const size_t length3 = MEM_readLE16(istart+4); + size_t length4; + const BYTE* const istart1 = istart + 6; /* jumpTable */ + const BYTE* const istart2 = istart1 + length1; + const BYTE* const istart3 = istart2 + length2; + const BYTE* const istart4 = istart3 + length3; + const size_t segmentSize = (dstSize+3) / 4; + BYTE* const opStart2 = ostart + segmentSize; + BYTE* const opStart3 = opStart2 + segmentSize; + BYTE* const opStart4 = opStart3 + segmentSize; + BYTE* op1 = ostart; + BYTE* op2 = opStart2; + BYTE* op3 = opStart3; + BYTE* op4 = opStart4; + U32 endSignal; + + length4 = cSrcSize - (length1 + length2 + length3 + 6); + if (length4 > cSrcSize) return ERROR(corruption_detected); /* overflow */ + errorCode = BIT_initDStream(&bitD1, istart1, length1); + if (HUF_isError(errorCode)) return errorCode; + errorCode = BIT_initDStream(&bitD2, istart2, length2); + if (HUF_isError(errorCode)) return errorCode; + errorCode = BIT_initDStream(&bitD3, istart3, length3); + if (HUF_isError(errorCode)) return errorCode; + errorCode = BIT_initDStream(&bitD4, istart4, length4); + if (HUF_isError(errorCode)) return errorCode; + + /* 16-32 symbols per loop (4-8 symbols per stream) */ + endSignal = BIT_reloadDStream(&bitD1) | BIT_reloadDStream(&bitD2) | BIT_reloadDStream(&bitD3) | BIT_reloadDStream(&bitD4); + for ( ; (endSignal==BIT_DStream_unfinished) && (op4<(oend-7)) ; ) + { + HUF_DECODE_SYMBOLX2_2(op1, &bitD1); + HUF_DECODE_SYMBOLX2_2(op2, &bitD2); + HUF_DECODE_SYMBOLX2_2(op3, &bitD3); + HUF_DECODE_SYMBOLX2_2(op4, &bitD4); + HUF_DECODE_SYMBOLX2_1(op1, &bitD1); + HUF_DECODE_SYMBOLX2_1(op2, &bitD2); + HUF_DECODE_SYMBOLX2_1(op3, &bitD3); + HUF_DECODE_SYMBOLX2_1(op4, &bitD4); + HUF_DECODE_SYMBOLX2_2(op1, &bitD1); + HUF_DECODE_SYMBOLX2_2(op2, &bitD2); + HUF_DECODE_SYMBOLX2_2(op3, &bitD3); + HUF_DECODE_SYMBOLX2_2(op4, &bitD4); + HUF_DECODE_SYMBOLX2_0(op1, &bitD1); + HUF_DECODE_SYMBOLX2_0(op2, &bitD2); + HUF_DECODE_SYMBOLX2_0(op3, &bitD3); + HUF_DECODE_SYMBOLX2_0(op4, &bitD4); + + endSignal = BIT_reloadDStream(&bitD1) | BIT_reloadDStream(&bitD2) | BIT_reloadDStream(&bitD3) | BIT_reloadDStream(&bitD4); + } + + /* check corruption */ + if (op1 > opStart2) return ERROR(corruption_detected); + if (op2 > opStart3) return ERROR(corruption_detected); + if (op3 > opStart4) return ERROR(corruption_detected); + /* note : op4 supposed already verified within main loop */ + + /* finish bitStreams one by one */ + HUF_decodeStreamX2(op1, &bitD1, opStart2, dt, dtLog); + HUF_decodeStreamX2(op2, &bitD2, opStart3, dt, dtLog); + HUF_decodeStreamX2(op3, &bitD3, opStart4, dt, dtLog); + HUF_decodeStreamX2(op4, &bitD4, oend, dt, dtLog); + + /* check */ + endSignal = BIT_endOfDStream(&bitD1) & BIT_endOfDStream(&bitD2) & BIT_endOfDStream(&bitD3) & BIT_endOfDStream(&bitD4); + if (!endSignal) return ERROR(corruption_detected); + + /* decoded size */ + return dstSize; + } +} + + +static size_t HUF_decompress4X2 (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize) +{ + HUF_CREATE_STATIC_DTABLEX2(DTable, HUF_MAX_TABLELOG); + const BYTE* ip = (const BYTE*) cSrc; + size_t errorCode; + + errorCode = HUF_readDTableX2 (DTable, cSrc, cSrcSize); + if (HUF_isError(errorCode)) return errorCode; + if (errorCode >= cSrcSize) return ERROR(srcSize_wrong); + ip += errorCode; + cSrcSize -= errorCode; + + return HUF_decompress4X2_usingDTable (dst, dstSize, ip, cSrcSize, DTable); +} + + +/***************************/ +/* double-symbols decoding */ +/***************************/ + +static void HUF_fillDTableX4Level2(HUF_DEltX4* DTable, U32 sizeLog, const U32 consumed, + const U32* rankValOrigin, const int minWeight, + const sortedSymbol_t* sortedSymbols, const U32 sortedListSize, + U32 nbBitsBaseline, U16 baseSeq) +{ + HUF_DEltX4 DElt; + U32 rankVal[HUF_ABSOLUTEMAX_TABLELOG + 1]; + U32 s; + + /* get pre-calculated rankVal */ + memcpy(rankVal, rankValOrigin, sizeof(rankVal)); + + /* fill skipped values */ + if (minWeight>1) + { + U32 i, skipSize = rankVal[minWeight]; + MEM_writeLE16(&(DElt.sequence), baseSeq); + DElt.nbBits = (BYTE)(consumed); + DElt.length = 1; + for (i = 0; i < skipSize; i++) + DTable[i] = DElt; + } + + /* fill DTable */ + for (s=0; s= 1 */ + + rankVal[weight] += length; + } +} + +typedef U32 rankVal_t[HUF_ABSOLUTEMAX_TABLELOG][HUF_ABSOLUTEMAX_TABLELOG + 1]; + +static void HUF_fillDTableX4(HUF_DEltX4* DTable, const U32 targetLog, + const sortedSymbol_t* sortedList, const U32 sortedListSize, + const U32* rankStart, rankVal_t rankValOrigin, const U32 maxWeight, + const U32 nbBitsBaseline) +{ + U32 rankVal[HUF_ABSOLUTEMAX_TABLELOG + 1]; + const int scaleLog = nbBitsBaseline - targetLog; /* note : targetLog >= srcLog, hence scaleLog <= 1 */ + const U32 minBits = nbBitsBaseline - maxWeight; + U32 s; + + memcpy(rankVal, rankValOrigin, sizeof(rankVal)); + + /* fill DTable */ + for (s=0; s= minBits) /* enough room for a second symbol */ + { + U32 sortedRank; + int minWeight = nbBits + scaleLog; + if (minWeight < 1) minWeight = 1; + sortedRank = rankStart[minWeight]; + HUF_fillDTableX4Level2(DTable+start, targetLog-nbBits, nbBits, + rankValOrigin[nbBits], minWeight, + sortedList+sortedRank, sortedListSize-sortedRank, + nbBitsBaseline, symbol); + } + else + { + U32 i; + const U32 end = start + length; + HUF_DEltX4 DElt; + + MEM_writeLE16(&(DElt.sequence), symbol); + DElt.nbBits = (BYTE)(nbBits); + DElt.length = 1; + for (i = start; i < end; i++) + DTable[i] = DElt; + } + rankVal[weight] += length; + } +} + +static size_t HUF_readDTableX4 (U32* DTable, const void* src, size_t srcSize) +{ + BYTE weightList[HUF_MAX_SYMBOL_VALUE + 1]; + sortedSymbol_t sortedSymbol[HUF_MAX_SYMBOL_VALUE + 1]; + U32 rankStats[HUF_ABSOLUTEMAX_TABLELOG + 1] = { 0 }; + U32 rankStart0[HUF_ABSOLUTEMAX_TABLELOG + 2] = { 0 }; + U32* const rankStart = rankStart0+1; + rankVal_t rankVal; + U32 tableLog, maxW, sizeOfSort, nbSymbols; + const U32 memLog = DTable[0]; + const BYTE* ip = (const BYTE*) src; + size_t iSize = ip[0]; + void* ptr = DTable; + HUF_DEltX4* const dt = ((HUF_DEltX4*)ptr) + 1; + + HUF_STATIC_ASSERT(sizeof(HUF_DEltX4) == sizeof(U32)); /* if compilation fails here, assertion is false */ + if (memLog > HUF_ABSOLUTEMAX_TABLELOG) return ERROR(tableLog_tooLarge); + //memset(weightList, 0, sizeof(weightList)); /* is not necessary, even though some analyzer complain ... */ + + iSize = HUF_readStats(weightList, HUF_MAX_SYMBOL_VALUE + 1, rankStats, &nbSymbols, &tableLog, src, srcSize); + if (HUF_isError(iSize)) return iSize; + + /* check result */ + if (tableLog > memLog) return ERROR(tableLog_tooLarge); /* DTable can't fit code depth */ + + /* find maxWeight */ + for (maxW = tableLog; rankStats[maxW]==0; maxW--) + {if (!maxW) return ERROR(GENERIC); } /* necessarily finds a solution before maxW==0 */ + + /* Get start index of each weight */ + { + U32 w, nextRankStart = 0; + for (w=1; w<=maxW; w++) + { + U32 current = nextRankStart; + nextRankStart += rankStats[w]; + rankStart[w] = current; + } + rankStart[0] = nextRankStart; /* put all 0w symbols at the end of sorted list*/ + sizeOfSort = nextRankStart; + } + + /* sort symbols by weight */ + { + U32 s; + for (s=0; s> consumed; + } + } + } + + HUF_fillDTableX4(dt, memLog, + sortedSymbol, sizeOfSort, + rankStart0, rankVal, maxW, + tableLog+1); + + return iSize; +} + + +static U32 HUF_decodeSymbolX4(void* op, BIT_DStream_t* DStream, const HUF_DEltX4* dt, const U32 dtLog) +{ + const size_t val = BIT_lookBitsFast(DStream, dtLog); /* note : dtLog >= 1 */ + memcpy(op, dt+val, 2); + BIT_skipBits(DStream, dt[val].nbBits); + return dt[val].length; +} + +static U32 HUF_decodeLastSymbolX4(void* op, BIT_DStream_t* DStream, const HUF_DEltX4* dt, const U32 dtLog) +{ + const size_t val = BIT_lookBitsFast(DStream, dtLog); /* note : dtLog >= 1 */ + memcpy(op, dt+val, 1); + if (dt[val].length==1) BIT_skipBits(DStream, dt[val].nbBits); + else + { + if (DStream->bitsConsumed < (sizeof(DStream->bitContainer)*8)) + { + BIT_skipBits(DStream, dt[val].nbBits); + if (DStream->bitsConsumed > (sizeof(DStream->bitContainer)*8)) + DStream->bitsConsumed = (sizeof(DStream->bitContainer)*8); /* ugly hack; works only because it's the last symbol. Note : can't easily extract nbBits from just this symbol */ + } + } + return 1; +} + + +#define HUF_DECODE_SYMBOLX4_0(ptr, DStreamPtr) \ + ptr += HUF_decodeSymbolX4(ptr, DStreamPtr, dt, dtLog) + +#define HUF_DECODE_SYMBOLX4_1(ptr, DStreamPtr) \ + if (MEM_64bits() || (HUF_MAX_TABLELOG<=12)) \ + ptr += HUF_decodeSymbolX4(ptr, DStreamPtr, dt, dtLog) + +#define HUF_DECODE_SYMBOLX4_2(ptr, DStreamPtr) \ + if (MEM_64bits()) \ + ptr += HUF_decodeSymbolX4(ptr, DStreamPtr, dt, dtLog) + +static inline size_t HUF_decodeStreamX4(BYTE* p, BIT_DStream_t* bitDPtr, BYTE* const pEnd, const HUF_DEltX4* const dt, const U32 dtLog) +{ + BYTE* const pStart = p; + + /* up to 8 symbols at a time */ + while ((BIT_reloadDStream(bitDPtr) == BIT_DStream_unfinished) && (p < pEnd-7)) + { + HUF_DECODE_SYMBOLX4_2(p, bitDPtr); + HUF_DECODE_SYMBOLX4_1(p, bitDPtr); + HUF_DECODE_SYMBOLX4_2(p, bitDPtr); + HUF_DECODE_SYMBOLX4_0(p, bitDPtr); + } + + /* closer to the end */ + while ((BIT_reloadDStream(bitDPtr) == BIT_DStream_unfinished) && (p <= pEnd-2)) + HUF_DECODE_SYMBOLX4_0(p, bitDPtr); + + while (p <= pEnd-2) + HUF_DECODE_SYMBOLX4_0(p, bitDPtr); /* no need to reload : reached the end of DStream */ + + if (p < pEnd) + p += HUF_decodeLastSymbolX4(p, bitDPtr, dt, dtLog); + + return p-pStart; +} + + + +static size_t HUF_decompress4X4_usingDTable( + void* dst, size_t dstSize, + const void* cSrc, size_t cSrcSize, + const U32* DTable) +{ + if (cSrcSize < 10) return ERROR(corruption_detected); /* strict minimum : jump table + 1 byte per stream */ + + { + const BYTE* const istart = (const BYTE*) cSrc; + BYTE* const ostart = (BYTE*) dst; + BYTE* const oend = ostart + dstSize; + + const void* ptr = DTable; + const HUF_DEltX4* const dt = ((const HUF_DEltX4*)ptr) +1; + const U32 dtLog = DTable[0]; + size_t errorCode; + + /* Init */ + BIT_DStream_t bitD1; + BIT_DStream_t bitD2; + BIT_DStream_t bitD3; + BIT_DStream_t bitD4; + const size_t length1 = MEM_readLE16(istart); + const size_t length2 = MEM_readLE16(istart+2); + const size_t length3 = MEM_readLE16(istart+4); + size_t length4; + const BYTE* const istart1 = istart + 6; /* jumpTable */ + const BYTE* const istart2 = istart1 + length1; + const BYTE* const istart3 = istart2 + length2; + const BYTE* const istart4 = istart3 + length3; + const size_t segmentSize = (dstSize+3) / 4; + BYTE* const opStart2 = ostart + segmentSize; + BYTE* const opStart3 = opStart2 + segmentSize; + BYTE* const opStart4 = opStart3 + segmentSize; + BYTE* op1 = ostart; + BYTE* op2 = opStart2; + BYTE* op3 = opStart3; + BYTE* op4 = opStart4; + U32 endSignal; + + length4 = cSrcSize - (length1 + length2 + length3 + 6); + if (length4 > cSrcSize) return ERROR(corruption_detected); /* overflow */ + errorCode = BIT_initDStream(&bitD1, istart1, length1); + if (HUF_isError(errorCode)) return errorCode; + errorCode = BIT_initDStream(&bitD2, istart2, length2); + if (HUF_isError(errorCode)) return errorCode; + errorCode = BIT_initDStream(&bitD3, istart3, length3); + if (HUF_isError(errorCode)) return errorCode; + errorCode = BIT_initDStream(&bitD4, istart4, length4); + if (HUF_isError(errorCode)) return errorCode; + + /* 16-32 symbols per loop (4-8 symbols per stream) */ + endSignal = BIT_reloadDStream(&bitD1) | BIT_reloadDStream(&bitD2) | BIT_reloadDStream(&bitD3) | BIT_reloadDStream(&bitD4); + for ( ; (endSignal==BIT_DStream_unfinished) && (op4<(oend-7)) ; ) + { + HUF_DECODE_SYMBOLX4_2(op1, &bitD1); + HUF_DECODE_SYMBOLX4_2(op2, &bitD2); + HUF_DECODE_SYMBOLX4_2(op3, &bitD3); + HUF_DECODE_SYMBOLX4_2(op4, &bitD4); + HUF_DECODE_SYMBOLX4_1(op1, &bitD1); + HUF_DECODE_SYMBOLX4_1(op2, &bitD2); + HUF_DECODE_SYMBOLX4_1(op3, &bitD3); + HUF_DECODE_SYMBOLX4_1(op4, &bitD4); + HUF_DECODE_SYMBOLX4_2(op1, &bitD1); + HUF_DECODE_SYMBOLX4_2(op2, &bitD2); + HUF_DECODE_SYMBOLX4_2(op3, &bitD3); + HUF_DECODE_SYMBOLX4_2(op4, &bitD4); + HUF_DECODE_SYMBOLX4_0(op1, &bitD1); + HUF_DECODE_SYMBOLX4_0(op2, &bitD2); + HUF_DECODE_SYMBOLX4_0(op3, &bitD3); + HUF_DECODE_SYMBOLX4_0(op4, &bitD4); + + endSignal = BIT_reloadDStream(&bitD1) | BIT_reloadDStream(&bitD2) | BIT_reloadDStream(&bitD3) | BIT_reloadDStream(&bitD4); + } + + /* check corruption */ + if (op1 > opStart2) return ERROR(corruption_detected); + if (op2 > opStart3) return ERROR(corruption_detected); + if (op3 > opStart4) return ERROR(corruption_detected); + /* note : op4 supposed already verified within main loop */ + + /* finish bitStreams one by one */ + HUF_decodeStreamX4(op1, &bitD1, opStart2, dt, dtLog); + HUF_decodeStreamX4(op2, &bitD2, opStart3, dt, dtLog); + HUF_decodeStreamX4(op3, &bitD3, opStart4, dt, dtLog); + HUF_decodeStreamX4(op4, &bitD4, oend, dt, dtLog); + + /* check */ + endSignal = BIT_endOfDStream(&bitD1) & BIT_endOfDStream(&bitD2) & BIT_endOfDStream(&bitD3) & BIT_endOfDStream(&bitD4); + if (!endSignal) return ERROR(corruption_detected); + + /* decoded size */ + return dstSize; + } +} + + +static size_t HUF_decompress4X4 (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize) +{ + HUF_CREATE_STATIC_DTABLEX4(DTable, HUF_MAX_TABLELOG); + const BYTE* ip = (const BYTE*) cSrc; + + size_t hSize = HUF_readDTableX4 (DTable, cSrc, cSrcSize); + if (HUF_isError(hSize)) return hSize; + if (hSize >= cSrcSize) return ERROR(srcSize_wrong); + ip += hSize; + cSrcSize -= hSize; + + return HUF_decompress4X4_usingDTable (dst, dstSize, ip, cSrcSize, DTable); +} + + +/**********************************/ +/* quad-symbol decoding */ +/**********************************/ +typedef struct { BYTE nbBits; BYTE nbBytes; } HUF_DDescX6; +typedef union { BYTE byte[4]; U32 sequence; } HUF_DSeqX6; + +/* recursive, up to level 3; may benefit from