diff --git a/CMakeLists.txt b/CMakeLists.txt index 2062f9aaf..e5e8a96cc 100644 --- a/CMakeLists.txt +++ b/CMakeLists.txt @@ -91,6 +91,11 @@ if (NOT LIBXML2_FOUND) MESSAGE(FATAL_ERROR "Could not find a usable libxml2 development environment!") endif() +INCLUDE (FindSnappy.cmake) +if (NOT SNAPPY_FOUND) + MESSAGE(FATAL_ERROR "Snappy not found please install snappy-devel for CentOS/RedHat or libsnappy-dev for Ubuntu/Debian") +endif() + FIND_PROGRAM(AWK_EXECUTABLE awk DOC "path to the awk executable") if(NOT AWK_EXECUTABLE) message(FATAL_ERROR "awk not found!") diff --git a/FindSnappy.cmake b/FindSnappy.cmake new file mode 100644 index 000000000..7ac14a271 --- /dev/null +++ b/FindSnappy.cmake @@ -0,0 +1,44 @@ +# - Try to find snappy headers and libraries. +# +# Usage of this module as follows: +# +# find_package(Snappy) +# +# Variables used by this module, they can change the default behaviour and need +# to be set before calling find_package: +# +# SNAPPY_ROOT_DIR Set this variable to the root installation of +# jemalloc if the module has problems finding +# the proper installation path. +# +# Variables defined by this module: +# +# SNAPPY_FOUND System has snappy libs/headers +# SNAPPY_LIBRARIES The snappy library/libraries +# SNAPPY_INCLUDE_DIR The location of snappy headers + +find_path(SNAPPY_ROOT_DIR + NAMES include/snappy.h +) + +find_library(SNAPPY_LIBRARIES + NAMES snappy + HINTS ${SNAPPY_ROOT_DIR}/lib +) + +find_path(SNAPPY_INCLUDE_DIR + NAMES snappy.h + HINTS ${JEMALLOC_ROOT_DIR}/include +) + +include(FindPackageHandleStandardArgs) +find_package_handle_standard_args(Snappy DEFAULT_MSG + SNAPPY_LIBRARIES + SNAPPY_INCLUDE_DIR +) + +mark_as_advanced( + SNAPPY_ROOT_DIR + SNAPPY_LIBRARIES + SNAPPY_INCLUDE_DIR +) diff --git a/utils/compress/CMakeLists.txt b/utils/compress/CMakeLists.txt index 543f6cff9..3d3e5be26 100644 --- a/utils/compress/CMakeLists.txt +++ b/utils/compress/CMakeLists.txt @@ -1,19 +1,18 @@ -include_directories( ${ENGINE_COMMON_INCLUDES} ) +include_directories( ${ENGINE_COMMON_INCLUDES} ${SNAPPY_INCLUDE_DIR} ) ########### next target ############### set(compress_LIB_SRCS idbcompress.cpp - snappy.cpp - snappy-sinksource.cpp - version1.cpp - snappy-stubs-internal.cpp) + version1.cpp) add_definitions(-DNDEBUG) add_library(compress SHARED ${compress_LIB_SRCS}) +target_link_libraries(compress ${SNAPPY_LIBRARIES}) + set_target_properties(compress PROPERTIES VERSION 1.0.0 SOVERSION 1) install(TARGETS compress DESTINATION ${ENGINE_LIBDIR} COMPONENT libs) diff --git a/utils/compress/snappy-config-win.h b/utils/compress/snappy-config-win.h deleted file mode 100644 index 34ed55051..000000000 --- a/utils/compress/snappy-config-win.h +++ /dev/null @@ -1,125 +0,0 @@ -/* config.h. Generated from config.h.in by configure. */ -/* config.h.in. Generated from configure.ac by autoheader. */ - -/* Define to 1 if the compiler supports __builtin_ctz and friends. */ -/* #undef HAVE_BUILTIN_CTZ 1 */ - -/* Define to 1 if the compiler supports __builtin_expect. */ -/* #define HAVE_BUILTIN_EXPECT 1 */ - -/* Define to 1 if you have the header file. */ -/* #undef HAVE_BYTESWAP_H 1 */ - -/* Define to 1 if you have the header file. */ -/* #undef HAVE_DLFCN_H 1 */ - -/* Use the gflags package for command-line parsing. */ -/* #undef HAVE_GFLAGS */ - -/* Defined when Google Test is available. */ -/* #undef HAVE_GTEST */ - -/* Define to 1 if you have the header file. */ -/* #undef HAVE_INTTYPES_H 1 */ - -/* Define to 1 if you have the `fastlz' library (-lfastlz). */ -/* #undef HAVE_LIBFASTLZ */ - -/* Define to 1 if you have the `lzf' library (-llzf). */ -/* #undef HAVE_LIBLZF */ - -/* Define to 1 if you have the `lzo2' library (-llzo2). */ -/* #undef HAVE_LIBLZO2 */ - -/* Define to 1 if you have the `quicklz' library (-lquicklz). */ -/* #undef HAVE_LIBQUICKLZ */ - -/* Define to 1 if you have the `z' library (-lz). */ -/* #undef HAVE_LIBZ 1 */ - -/* Define to 1 if you have the header file. */ -#define HAVE_MEMORY_H 1 - -/* Define to 1 if you have the header file. */ -#define HAVE_STDDEF_H 1 - -/* Define to 1 if you have the header file. */ -#define HAVE_STDINT_H 1 - -/* Define to 1 if you have the header file. */ -#define HAVE_STDLIB_H 1 - -/* Define to 1 if you have the header file. */ -#define HAVE_STRINGS_H 1 - -/* Define to 1 if you have the header file. */ -#define HAVE_STRING_H 1 - -/* Define to 1 if you have the header file. */ -/* #undef HAVE_SYS_BYTESWAP_H */ - -/* Define to 1 if you have the header file. */ -/* #undef HAVE_SYS_ENDIAN_H */ - -/* Define to 1 if you have the header file. */ -/* #undef HAVE_SYS_MMAN_H 1 */ - -/* Define to 1 if you have the header file. */ -/* #undef HAVE_SYS_RESOURCE_H 1 */ - -/* Define to 1 if you have the header file. */ -#define HAVE_SYS_STAT_H 1 - -/* Define to 1 if you have the header file. */ -#define HAVE_SYS_TIME_H 1 - -/* Define to 1 if you have the header file. */ -#define HAVE_SYS_TYPES_H 1 - -/* Define to 1 if you have the header file. */ -#define HAVE_UNISTD_H 1 - -/* Define to 1 if you have the header file. */ -#define HAVE_WINDOWS_H - -/* Define to the sub-directory in which libtool stores uninstalled libraries. - */ -#define LT_OBJDIR ".libs/" - -/* Name of package */ -#define PACKAGE "snappy" - -/* Define to the address where bug reports for this package should be sent. */ -#define PACKAGE_BUGREPORT "" - -/* Define to the full name of this package. */ -#define PACKAGE_NAME "snappy" - -/* Define to the full name and version of this package. */ -#define PACKAGE_STRING "snappy 1.1.1" - -/* Define to the one symbol short name of this package. */ -#define PACKAGE_TARNAME "snappy" - -/* Define to the version of this package. */ -#define PACKAGE_VERSION "1.1.1" - -/* Define to 1 if you have the ANSI C header files. */ -#define STDC_HEADERS 1 - -/* Version number of package */ -#define VERSION "1.1.1" - -/* Define WORDS_BIGENDIAN to 1 if your processor stores words with the most - significant byte first (like Motorola and SPARC, unlike Intel and VAX). */ -#if defined __BIG_ENDIAN__ -# define WORDS_BIGENDIAN 1 -#elif ! defined __LITTLE_ENDIAN__ -/* # undef WORDS_BIGENDIAN */ -#endif - -/* Define to `unsigned int' if does not define. */ -/* #undef size_t */ - -/* Define to `int' if does not define. */ -/* #undef ssize_t */ diff --git a/utils/compress/snappy-config.h b/utils/compress/snappy-config.h deleted file mode 100644 index ff7ab82eb..000000000 --- a/utils/compress/snappy-config.h +++ /dev/null @@ -1,125 +0,0 @@ -/* config.h. Generated from config.h.in by configure. */ -/* config.h.in. Generated from configure.ac by autoheader. */ - -/* Define to 1 if the compiler supports __builtin_ctz and friends. */ -#define HAVE_BUILTIN_CTZ 1 - -/* Define to 1 if the compiler supports __builtin_expect. */ -#define HAVE_BUILTIN_EXPECT 1 - -/* Define to 1 if you have the header file. */ -#define HAVE_BYTESWAP_H 1 - -/* Define to 1 if you have the header file. */ -#define HAVE_DLFCN_H 1 - -/* Use the gflags package for command-line parsing. */ -/* #undef HAVE_GFLAGS */ - -/* Defined when Google Test is available. */ -/* #undef HAVE_GTEST */ - -/* Define to 1 if you have the header file. */ -#define HAVE_INTTYPES_H 1 - -/* Define to 1 if you have the `fastlz' library (-lfastlz). */ -/* #undef HAVE_LIBFASTLZ */ - -/* Define to 1 if you have the `lzf' library (-llzf). */ -/* #undef HAVE_LIBLZF */ - -/* Define to 1 if you have the `lzo2' library (-llzo2). */ -/* #undef HAVE_LIBLZO2 */ - -/* Define to 1 if you have the `quicklz' library (-lquicklz). */ -/* #undef HAVE_LIBQUICKLZ */ - -/* Define to 1 if you have the `z' library (-lz). */ -#define HAVE_LIBZ 1 - -/* Define to 1 if you have the header file. */ -#define HAVE_MEMORY_H 1 - -/* Define to 1 if you have the header file. */ -#define HAVE_STDDEF_H 1 - -/* Define to 1 if you have the header file. */ -#define HAVE_STDINT_H 1 - -/* Define to 1 if you have the header file. */ -#define HAVE_STDLIB_H 1 - -/* Define to 1 if you have the header file. */ -#define HAVE_STRINGS_H 1 - -/* Define to 1 if you have the header file. */ -#define HAVE_STRING_H 1 - -/* Define to 1 if you have the header file. */ -/* #undef HAVE_SYS_BYTESWAP_H */ - -/* Define to 1 if you have the header file. */ -/* #undef HAVE_SYS_ENDIAN_H */ - -/* Define to 1 if you have the header file. */ -#define HAVE_SYS_MMAN_H 1 - -/* Define to 1 if you have the header file. */ -#define HAVE_SYS_RESOURCE_H 1 - -/* Define to 1 if you have the header file. */ -#define HAVE_SYS_STAT_H 1 - -/* Define to 1 if you have the header file. */ -#define HAVE_SYS_TIME_H 1 - -/* Define to 1 if you have the header file. */ -#define HAVE_SYS_TYPES_H 1 - -/* Define to 1 if you have the header file. */ -#define HAVE_UNISTD_H 1 - -/* Define to 1 if you have the header file. */ -/* #undef HAVE_WINDOWS_H */ - -/* Define to the sub-directory in which libtool stores uninstalled libraries. - */ -#define LT_OBJDIR ".libs/" - -/* Name of package */ -#define PACKAGE "snappy" - -/* Define to the address where bug reports for this package should be sent. */ -#define PACKAGE_BUGREPORT "" - -/* Define to the full name of this package. */ -#define PACKAGE_NAME "snappy" - -/* Define to the full name and version of this package. */ -#define PACKAGE_STRING "snappy 1.1.1" - -/* Define to the one symbol short name of this package. */ -#define PACKAGE_TARNAME "snappy" - -/* Define to the version of this package. */ -#define PACKAGE_VERSION "1.1.1" - -/* Define to 1 if you have the ANSI C header files. */ -#define STDC_HEADERS 1 - -/* Version number of package */ -#define VERSION "1.1.1" - -/* Define WORDS_BIGENDIAN to 1 if your processor stores words with the most - significant byte first (like Motorola and SPARC, unlike Intel and VAX). */ -#if defined __BIG_ENDIAN__ -# define WORDS_BIGENDIAN 1 -#elif ! defined __LITTLE_ENDIAN__ -/* # undef WORDS_BIGENDIAN */ -#endif - -/* Define to `unsigned int' if does not define. */ -/* #undef size_t */ - -/* Define to `int' if does not define. */ -/* #undef ssize_t */ diff --git a/utils/compress/snappy-internal.h b/utils/compress/snappy-internal.h deleted file mode 100644 index c99d33130..000000000 --- a/utils/compress/snappy-internal.h +++ /dev/null @@ -1,150 +0,0 @@ -// Copyright 2008 Google Inc. All Rights Reserved. -// -// 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. -// * Neither the name of Google Inc. nor the names of its -// contributors may be used to endorse or promote products derived from -// this software without specific prior written permission. -// -// 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. -// -// Internals shared between the Snappy implementation and its unittest. - -#ifndef UTIL_SNAPPY_SNAPPY_INTERNAL_H_ -#define UTIL_SNAPPY_SNAPPY_INTERNAL_H_ - -#include "snappy-stubs-internal.h" - -namespace snappy { -namespace internal { - -class WorkingMemory { - public: - WorkingMemory() : large_table_(NULL) { } - ~WorkingMemory() { delete[] large_table_; } - - // Allocates and clears a hash table using memory in "*this", - // stores the number of buckets in "*table_size" and returns a pointer to - // the base of the hash table. - uint16* GetHashTable(size_t input_size, int* table_size); - - private: - uint16 small_table_[1<<10]; // 2KB - uint16* large_table_; // Allocated only when needed - - DISALLOW_COPY_AND_ASSIGN(WorkingMemory); -}; - -// Flat array compression that does not emit the "uncompressed length" -// prefix. Compresses "input" string to the "*op" buffer. -// -// REQUIRES: "input_length <= kBlockSize" -// REQUIRES: "op" points to an array of memory that is at least -// "MaxCompressedLength(input_length)" in size. -// REQUIRES: All elements in "table[0..table_size-1]" are initialized to zero. -// REQUIRES: "table_size" is a power of two -// -// Returns an "end" pointer into "op" buffer. -// "end - op" is the compressed size of "input". -char* CompressFragment(const char* input, - size_t input_length, - char* op, - uint16* table, - const int table_size); - -// Return the largest n such that -// -// s1[0,n-1] == s2[0,n-1] -// and n <= (s2_limit - s2). -// -// Does not read *s2_limit or beyond. -// Does not read *(s1 + (s2_limit - s2)) or beyond. -// Requires that s2_limit >= s2. -// -// Separate implementation for x86_64, for speed. Uses the fact that -// x86_64 is little endian. -#if defined(ARCH_K8) -static inline int FindMatchLength(const char* s1, - const char* s2, - const char* s2_limit) { - assert(s2_limit >= s2); - int matched = 0; - - // Find out how long the match is. We loop over the data 64 bits at a - // time until we find a 64-bit block that doesn't match; then we find - // the first non-matching bit and use that to calculate the total - // length of the match. - while (PREDICT_TRUE(s2 <= s2_limit - 8)) { - if (PREDICT_FALSE(UNALIGNED_LOAD64(s2) == UNALIGNED_LOAD64(s1 + matched))) { - s2 += 8; - matched += 8; - } else { - // On current (mid-2008) Opteron models there is a 3% more - // efficient code sequence to find the first non-matching byte. - // However, what follows is ~10% better on Intel Core 2 and newer, - // and we expect AMD's bsf instruction to improve. - uint64 x = UNALIGNED_LOAD64(s2) ^ UNALIGNED_LOAD64(s1 + matched); - int matching_bits = Bits::FindLSBSetNonZero64(x); - matched += matching_bits >> 3; - return matched; - } - } - while (PREDICT_TRUE(s2 < s2_limit)) { - if (PREDICT_TRUE(s1[matched] == *s2)) { - ++s2; - ++matched; - } else { - return matched; - } - } - return matched; -} -#else -static inline int FindMatchLength(const char* s1, - const char* s2, - const char* s2_limit) { - // Implementation based on the x86-64 version, above. - assert(s2_limit >= s2); - int matched = 0; - - while (s2 <= s2_limit - 4 && - UNALIGNED_LOAD32(s2) == UNALIGNED_LOAD32(s1 + matched)) { - s2 += 4; - matched += 4; - } - if (LittleEndian::IsLittleEndian() && s2 <= s2_limit - 4) { - uint32 x = UNALIGNED_LOAD32(s2) ^ UNALIGNED_LOAD32(s1 + matched); - int matching_bits = Bits::FindLSBSetNonZero(x); - matched += matching_bits >> 3; - } else { - while ((s2 < s2_limit) && (s1[matched] == *s2)) { - ++s2; - ++matched; - } - } - return matched; -} -#endif - -} // end namespace internal -} // end namespace snappy - -#endif // UTIL_SNAPPY_SNAPPY_INTERNAL_H_ diff --git a/utils/compress/snappy-sinksource.cpp b/utils/compress/snappy-sinksource.cpp deleted file mode 100644 index 5844552cb..000000000 --- a/utils/compress/snappy-sinksource.cpp +++ /dev/null @@ -1,71 +0,0 @@ -// Copyright 2011 Google Inc. All Rights Reserved. -// -// 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. -// * Neither the name of Google Inc. nor the names of its -// contributors may be used to endorse or promote products derived from -// this software without specific prior written permission. -// -// 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. - -#include - -#include "snappy-sinksource.h" - -namespace snappy { - -Source::~Source() { } - -Sink::~Sink() { } - -char* Sink::GetAppendBuffer(size_t length, char* scratch) { - return scratch; -} - -ByteArraySource::~ByteArraySource() { } - -size_t ByteArraySource::Available() const { return left_; } - -const char* ByteArraySource::Peek(size_t* len) { - *len = left_; - return ptr_; -} - -void ByteArraySource::Skip(size_t n) { - left_ -= n; - ptr_ += n; -} - -UncheckedByteArraySink::~UncheckedByteArraySink() { } - -void UncheckedByteArraySink::Append(const char* data, size_t n) { - // Do no copying if the caller filled in the result of GetAppendBuffer() - if (data != dest_) { - memcpy(dest_, data, n); - } - dest_ += n; -} - -char* UncheckedByteArraySink::GetAppendBuffer(size_t len, char* scratch) { - return dest_; -} - -} diff --git a/utils/compress/snappy-sinksource.h b/utils/compress/snappy-sinksource.h deleted file mode 100644 index faabfa1e6..000000000 --- a/utils/compress/snappy-sinksource.h +++ /dev/null @@ -1,137 +0,0 @@ -// Copyright 2011 Google Inc. All Rights Reserved. -// -// 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. -// * Neither the name of Google Inc. nor the names of its -// contributors may be used to endorse or promote products derived from -// this software without specific prior written permission. -// -// 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. - -#ifndef UTIL_SNAPPY_SNAPPY_SINKSOURCE_H_ -#define UTIL_SNAPPY_SNAPPY_SINKSOURCE_H_ - -#include - - -namespace snappy { - -// A Sink is an interface that consumes a sequence of bytes. -class Sink { - public: - Sink() { } - virtual ~Sink(); - - // Append "bytes[0,n-1]" to this. - virtual void Append(const char* bytes, size_t n) = 0; - - // Returns a writable buffer of the specified length for appending. - // May return a pointer to the caller-owned scratch buffer which - // must have at least the indicated length. The returned buffer is - // only valid until the next operation on this Sink. - // - // After writing at most "length" bytes, call Append() with the - // pointer returned from this function and the number of bytes - // written. Many Append() implementations will avoid copying - // bytes if this function returned an internal buffer. - // - // If a non-scratch buffer is returned, the caller may only pass a - // prefix of it to Append(). That is, it is not correct to pass an - // interior pointer of the returned array to Append(). - // - // The default implementation always returns the scratch buffer. - virtual char* GetAppendBuffer(size_t length, char* scratch); - - - private: - // No copying - Sink(const Sink&); - void operator=(const Sink&); -}; - -// A Source is an interface that yields a sequence of bytes -class Source { - public: - Source() { } - virtual ~Source(); - - // Return the number of bytes left to read from the source - virtual size_t Available() const = 0; - - // Peek at the next flat region of the source. Does not reposition - // the source. The returned region is empty iff Available()==0. - // - // Returns a pointer to the beginning of the region and store its - // length in *len. - // - // The returned region is valid until the next call to Skip() or - // until this object is destroyed, whichever occurs first. - // - // The returned region may be larger than Available() (for example - // if this ByteSource is a view on a substring of a larger source). - // The caller is responsible for ensuring that it only reads the - // Available() bytes. - virtual const char* Peek(size_t* len) = 0; - - // Skip the next n bytes. Invalidates any buffer returned by - // a previous call to Peek(). - // REQUIRES: Available() >= n - virtual void Skip(size_t n) = 0; - - private: - // No copying - Source(const Source&); - void operator=(const Source&); -}; - -// A Source implementation that yields the contents of a flat array -class ByteArraySource : public Source { - public: - ByteArraySource(const char* p, size_t n) : ptr_(p), left_(n) { } - virtual ~ByteArraySource(); - virtual size_t Available() const; - virtual const char* Peek(size_t* len); - virtual void Skip(size_t n); - private: - const char* ptr_; - size_t left_; -}; - -// A Sink implementation that writes to a flat array without any bound checks. -class UncheckedByteArraySink : public Sink { - public: - explicit UncheckedByteArraySink(char* dest) : dest_(dest) { } - virtual ~UncheckedByteArraySink(); - virtual void Append(const char* data, size_t n); - virtual char* GetAppendBuffer(size_t len, char* scratch); - - // Return the current output pointer so that a caller can see how - // many bytes were produced. - // Note: this is not a Sink method. - char* CurrentDestination() const { return dest_; } - private: - char* dest_; -}; - - -} - -#endif // UTIL_SNAPPY_SNAPPY_SINKSOURCE_H_ diff --git a/utils/compress/snappy-stubs-internal.cpp b/utils/compress/snappy-stubs-internal.cpp deleted file mode 100644 index 6ed334371..000000000 --- a/utils/compress/snappy-stubs-internal.cpp +++ /dev/null @@ -1,42 +0,0 @@ -// Copyright 2011 Google Inc. All Rights Reserved. -// -// 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. -// * Neither the name of Google Inc. nor the names of its -// contributors may be used to endorse or promote products derived from -// this software without specific prior written permission. -// -// 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. - -#include -#include - -#include "snappy-stubs-internal.h" - -namespace snappy { - -void Varint::Append32(string* s, uint32 value) { - char buf[Varint::kMax32]; - const char* p = Varint::Encode32(buf, value); - s->append(buf, p - buf); -} - -} // namespace snappy diff --git a/utils/compress/snappy-stubs-internal.h b/utils/compress/snappy-stubs-internal.h deleted file mode 100644 index 6d047d97c..000000000 --- a/utils/compress/snappy-stubs-internal.h +++ /dev/null @@ -1,494 +0,0 @@ -// Copyright 2011 Google Inc. All Rights Reserved. -// -// 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. -// * Neither the name of Google Inc. nor the names of its -// contributors may be used to endorse or promote products derived from -// this software without specific prior written permission. -// -// 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. -// -// Various stubs for the open-source version of Snappy. - -#ifndef UTIL_SNAPPY_OPENSOURCE_SNAPPY_STUBS_INTERNAL_H_ -#define UTIL_SNAPPY_OPENSOURCE_SNAPPY_STUBS_INTERNAL_H_ - -#ifdef _MSC_VER -#include -#include "snappy-config-win.h" -#else -#include "snappy-config.h" -#endif - -#include - -#include -#include -#include - -#ifdef HAVE_SYS_MMAN_H -#include -#endif - -#include "snappy-stubs-public.h" - -#if defined(__x86_64__) - -// Enable 64-bit optimized versions of some routines. -#define ARCH_K8 1 - -#endif - -// Needed by OS X, among others. -#ifndef MAP_ANONYMOUS -#define MAP_ANONYMOUS MAP_ANON -#endif - -// Pull in std::min, std::ostream, and the likes. This is safe because this -// header file is never used from any public header files. -using namespace std; - -// The size of an array, if known at compile-time. -// Will give unexpected results if used on a pointer. -// We undefine it first, since some compilers already have a definition. -#ifdef ARRAYSIZE -#undef ARRAYSIZE -#endif -#define ARRAYSIZE(a) (sizeof(a) / sizeof(*(a))) - -// Static prediction hints. -#ifdef HAVE_BUILTIN_EXPECT -#define PREDICT_FALSE(x) (__builtin_expect(x, 0)) -#define PREDICT_TRUE(x) (__builtin_expect(!!(x), 1)) -#else -#define PREDICT_FALSE(x) x -#define PREDICT_TRUE(x) x -#endif - -// This is only used for recomputing the tag byte table used during -// decompression; for simplicity we just remove it from the open-source -// version (anyone who wants to regenerate it can just do the call -// themselves within main()). -#define DEFINE_bool(flag_name, default_value, description) \ - bool FLAGS_ ## flag_name = default_value -#define DECLARE_bool(flag_name) \ - extern bool FLAGS_ ## flag_name - -namespace snappy { - -static const uint32 kuint32max = static_cast(0xFFFFFFFF); -static const int64 kint64max = static_cast(0x7FFFFFFFFFFFFFFFLL); - -// Potentially unaligned loads and stores. - -// x86 and PowerPC can simply do these loads and stores native. - -#if defined(__i386__) || defined(__x86_64__) || defined(__powerpc__) - -#define UNALIGNED_LOAD16(_p) (*reinterpret_cast(_p)) -#define UNALIGNED_LOAD32(_p) (*reinterpret_cast(_p)) -#define UNALIGNED_LOAD64(_p) (*reinterpret_cast(_p)) - -#define UNALIGNED_STORE16(_p, _val) (*reinterpret_cast(_p) = (_val)) -#define UNALIGNED_STORE32(_p, _val) (*reinterpret_cast(_p) = (_val)) -#define UNALIGNED_STORE64(_p, _val) (*reinterpret_cast(_p) = (_val)) - -// ARMv7 and newer support native unaligned accesses, but only of 16-bit -// and 32-bit values (not 64-bit); older versions either raise a fatal signal, -// do an unaligned read and rotate the words around a bit, or do the reads very -// slowly (trip through kernel mode). There's no simple #define that says just -// “ARMv7 or higher”, so we have to filter away all ARMv5 and ARMv6 -// sub-architectures. -// -// This is a mess, but there's not much we can do about it. - -#elif defined(__arm__) && \ - !defined(__ARM_ARCH_4__) && \ - !defined(__ARM_ARCH_4T__) && \ - !defined(__ARM_ARCH_5__) && \ - !defined(__ARM_ARCH_5T__) && \ - !defined(__ARM_ARCH_5TE__) && \ - !defined(__ARM_ARCH_5TEJ__) && \ - !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 UNALIGNED_LOAD16(_p) (*reinterpret_cast(_p)) -#define UNALIGNED_LOAD32(_p) (*reinterpret_cast(_p)) - -#define UNALIGNED_STORE16(_p, _val) (*reinterpret_cast(_p) = (_val)) -#define UNALIGNED_STORE32(_p, _val) (*reinterpret_cast(_p) = (_val)) - -// TODO(user): NEON supports unaligned 64-bit loads and stores. -// See if that would be more efficient on platforms supporting it, -// at least for copies. - -inline uint64 UNALIGNED_LOAD64(const void *p) { - uint64 t; - memcpy(&t, p, sizeof t); - return t; -} - -inline void UNALIGNED_STORE64(void *p, uint64 v) { - memcpy(p, &v, sizeof v); -} - -#else - -// These functions are provided for architectures that don't support -// unaligned loads and stores. - -inline uint16 UNALIGNED_LOAD16(const void *p) { - uint16 t; - memcpy(&t, p, sizeof t); - return t; -} - -inline uint32 UNALIGNED_LOAD32(const void *p) { - uint32 t; - memcpy(&t, p, sizeof t); - return t; -} - -inline uint64 UNALIGNED_LOAD64(const void *p) { - uint64 t; - memcpy(&t, p, sizeof t); - return t; -} - -inline void UNALIGNED_STORE16(void *p, uint16 v) { - memcpy(p, &v, sizeof v); -} - -inline void UNALIGNED_STORE32(void *p, uint32 v) { - memcpy(p, &v, sizeof v); -} - -inline void UNALIGNED_STORE64(void *p, uint64 v) { - memcpy(p, &v, sizeof v); -} - -#endif - -// This can be more efficient than UNALIGNED_LOAD64 + UNALIGNED_STORE64 -// on some platforms, in particular ARM. -inline void UnalignedCopy64(const void *src, void *dst) { - if (sizeof(void *) == 8) { - UNALIGNED_STORE64(dst, UNALIGNED_LOAD64(src)); - } else { - const char *src_char = reinterpret_cast(src); - char *dst_char = reinterpret_cast(dst); - - UNALIGNED_STORE32(dst_char, UNALIGNED_LOAD32(src_char)); - UNALIGNED_STORE32(dst_char + 4, UNALIGNED_LOAD32(src_char + 4)); - } -} - -// The following guarantees declaration of the byte swap functions. -#ifdef WORDS_BIGENDIAN - -#ifdef HAVE_SYS_BYTEORDER_H -#include -#endif - -#ifdef HAVE_SYS_ENDIAN_H -#include -#endif - -#ifdef _MSC_VER -#include -#define bswap_16(x) _byteswap_ushort(x) -#define bswap_32(x) _byteswap_ulong(x) -#define bswap_64(x) _byteswap_uint64(x) - -#elif defined(__APPLE__) -// Mac OS X / Darwin features -#include -#define bswap_16(x) OSSwapInt16(x) -#define bswap_32(x) OSSwapInt32(x) -#define bswap_64(x) OSSwapInt64(x) - -#elif defined(HAVE_BYTESWAP_H) -#include - -#elif defined(bswap32) -// FreeBSD defines bswap{16,32,64} in (already #included). -#define bswap_16(x) bswap16(x) -#define bswap_32(x) bswap32(x) -#define bswap_64(x) bswap64(x) - -#elif defined(BSWAP_64) -// Solaris 10 defines BSWAP_{16,32,64} in (already #included). -#define bswap_16(x) BSWAP_16(x) -#define bswap_32(x) BSWAP_32(x) -#define bswap_64(x) BSWAP_64(x) - -#else - -inline uint16 bswap_16(uint16 x) { - return (x << 8) | (x >> 8); -} - -inline uint32 bswap_32(uint32 x) { - x = ((x & 0xff00ff00UL) >> 8) | ((x & 0x00ff00ffUL) << 8); - return (x >> 16) | (x << 16); -} - -inline uint64 bswap_64(uint64 x) { - x = ((x & 0xff00ff00ff00ff00ULL) >> 8) | ((x & 0x00ff00ff00ff00ffULL) << 8); - x = ((x & 0xffff0000ffff0000ULL) >> 16) | ((x & 0x0000ffff0000ffffULL) << 16); - return (x >> 32) | (x << 32); -} - -#endif - -#endif // WORDS_BIGENDIAN - -// Convert to little-endian storage, opposite of network format. -// Convert x from host to little endian: x = LittleEndian.FromHost(x); -// convert x from little endian to host: x = LittleEndian.ToHost(x); -// -// Store values into unaligned memory converting to little endian order: -// LittleEndian.Store16(p, x); -// -// Load unaligned values stored in little endian converting to host order: -// x = LittleEndian.Load16(p); -class LittleEndian { - public: - // Conversion functions. -#ifdef WORDS_BIGENDIAN - - static uint16 FromHost16(uint16 x) { return bswap_16(x); } - static uint16 ToHost16(uint16 x) { return bswap_16(x); } - - static uint32 FromHost32(uint32 x) { return bswap_32(x); } - static uint32 ToHost32(uint32 x) { return bswap_32(x); } - - static bool IsLittleEndian() { return false; } - -#else // !defined(WORDS_BIGENDIAN) - - static uint16 FromHost16(uint16 x) { return x; } - static uint16 ToHost16(uint16 x) { return x; } - - static uint32 FromHost32(uint32 x) { return x; } - static uint32 ToHost32(uint32 x) { return x; } - - static bool IsLittleEndian() { return true; } - -#endif // !defined(WORDS_BIGENDIAN) - - // Functions to do unaligned loads and stores in little-endian order. - static uint16 Load16(const void *p) { - return ToHost16(UNALIGNED_LOAD16(p)); - } - - static void Store16(void *p, uint16 v) { - UNALIGNED_STORE16(p, FromHost16(v)); - } - - static uint32 Load32(const void *p) { - return ToHost32(UNALIGNED_LOAD32(p)); - } - - static void Store32(void *p, uint32 v) { - UNALIGNED_STORE32(p, FromHost32(v)); - } -}; - -// Some bit-manipulation functions. -class Bits { - public: - // Return floor(log2(n)) for positive integer n. Returns -1 iff n == 0. - static int Log2Floor(uint32 n); - - // Return the first set least / most significant bit, 0-indexed. Returns an - // undefined value if n == 0. FindLSBSetNonZero() is similar to ffs() except - // that it's 0-indexed. - static int FindLSBSetNonZero(uint32 n); - static int FindLSBSetNonZero64(uint64 n); - - private: - DISALLOW_COPY_AND_ASSIGN(Bits); -}; - -#ifdef HAVE_BUILTIN_CTZ - -inline int Bits::Log2Floor(uint32 n) { - return n == 0 ? -1 : 31 ^ __builtin_clz(n); -} - -inline int Bits::FindLSBSetNonZero(uint32 n) { - return __builtin_ctz(n); -} - -inline int Bits::FindLSBSetNonZero64(uint64 n) { - return __builtin_ctzll(n); -} - -#else // Portable versions. - -inline int Bits::Log2Floor(uint32 n) { - if (n == 0) - return -1; - int log = 0; - uint32 value = n; - for (int i = 4; i >= 0; --i) { - int shift = (1 << i); - uint32 x = value >> shift; - if (x != 0) { - value = x; - log += shift; - } - } - assert(value == 1); - return log; -} - -inline int Bits::FindLSBSetNonZero(uint32 n) { - int rc = 31; - for (int i = 4, shift = 1 << 4; i >= 0; --i) { - const uint32 x = n << shift; - if (x != 0) { - n = x; - rc -= shift; - } - shift >>= 1; - } - return rc; -} - -// FindLSBSetNonZero64() is defined in terms of FindLSBSetNonZero(). -inline int Bits::FindLSBSetNonZero64(uint64 n) { - const uint32 bottombits = static_cast(n); - if (bottombits == 0) { - // Bottom bits are zero, so scan in top bits - return 32 + FindLSBSetNonZero(static_cast(n >> 32)); - } else { - return FindLSBSetNonZero(bottombits); - } -} - -#endif // End portable versions. - -// Variable-length integer encoding. -class Varint { - public: - // Maximum lengths of varint encoding of uint32. - static const int kMax32 = 5; - - // Attempts to parse a varint32 from a prefix of the bytes in [ptr,limit-1]. - // Never reads a character at or beyond limit. If a valid/terminated varint32 - // was found in the range, stores it in *OUTPUT and returns a pointer just - // past the last byte of the varint32. Else returns NULL. On success, - // "result <= limit". - static const char* Parse32WithLimit(const char* ptr, const char* limit, - uint32* OUTPUT); - - // REQUIRES "ptr" points to a buffer of length sufficient to hold "v". - // EFFECTS Encodes "v" into "ptr" and returns a pointer to the - // byte just past the last encoded byte. - static char* Encode32(char* ptr, uint32 v); - - // EFFECTS Appends the varint representation of "value" to "*s". - static void Append32(string* s, uint32 value); -}; - -inline const char* Varint::Parse32WithLimit(const char* p, - const char* l, - uint32* OUTPUT) { - const unsigned char* ptr = reinterpret_cast(p); - const unsigned char* limit = reinterpret_cast(l); - uint32 b, result; - if (ptr >= limit) return NULL; - b = *(ptr++); result = b & 127; if (b < 128) goto done; - if (ptr >= limit) return NULL; - b = *(ptr++); result |= (b & 127) << 7; if (b < 128) goto done; - if (ptr >= limit) return NULL; - b = *(ptr++); result |= (b & 127) << 14; if (b < 128) goto done; - if (ptr >= limit) return NULL; - b = *(ptr++); result |= (b & 127) << 21; if (b < 128) goto done; - if (ptr >= limit) return NULL; - b = *(ptr++); result |= (b & 127) << 28; if (b < 16) goto done; - return NULL; // Value is too long to be a varint32 - done: - *OUTPUT = result; - return reinterpret_cast(ptr); -} - -inline char* Varint::Encode32(char* sptr, uint32 v) { - // Operate on characters as unsigneds - unsigned char* ptr = reinterpret_cast(sptr); - static const int B = 128; - if (v < (1<<7)) { - *(ptr++) = v; - } else if (v < (1<<14)) { - *(ptr++) = v | B; - *(ptr++) = v>>7; - } else if (v < (1<<21)) { - *(ptr++) = v | B; - *(ptr++) = (v>>7) | B; - *(ptr++) = v>>14; - } else if (v < (1<<28)) { - *(ptr++) = v | B; - *(ptr++) = (v>>7) | B; - *(ptr++) = (v>>14) | B; - *(ptr++) = v>>21; - } else { - *(ptr++) = v | B; - *(ptr++) = (v>>7) | B; - *(ptr++) = (v>>14) | B; - *(ptr++) = (v>>21) | B; - *(ptr++) = v>>28; - } - return reinterpret_cast(ptr); -} - -// If you know the internal layout of the std::string in use, you can -// replace this function with one that resizes the string without -// filling the new space with zeros (if applicable) -- -// it will be non-portable but faster. -inline void STLStringResizeUninitialized(string* s, size_t new_size) { - s->resize(new_size); -} - -// Return a mutable char* pointing to a string's internal buffer, -// which may not be null-terminated. Writing through this pointer will -// modify the string. -// -// string_as_array(&str)[i] is valid for 0 <= i < str.size() until the -// next call to a string method that invalidates iterators. -// -// As of 2006-04, there is no standard-blessed way of getting a -// mutable reference to a string's internal buffer. However, issue 530 -// (http://www.open-std.org/JTC1/SC22/WG21/docs/lwg-defects.html#530) -// proposes this as the method. It will officially be part of the standard -// for C++0x. This should already work on all current implementations. -inline char* string_as_array(string* str) { - return str->empty() ? NULL : &*str->begin(); -} - -} // namespace snappy - -#endif // UTIL_SNAPPY_OPENSOURCE_SNAPPY_STUBS_INTERNAL_H_ diff --git a/utils/compress/snappy-stubs-public.h b/utils/compress/snappy-stubs-public.h deleted file mode 100644 index ecda43987..000000000 --- a/utils/compress/snappy-stubs-public.h +++ /dev/null @@ -1,98 +0,0 @@ -// Copyright 2011 Google Inc. All Rights Reserved. -// Author: sesse@google.com (Steinar H. Gunderson) -// -// 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. -// * Neither the name of Google Inc. nor the names of its -// contributors may be used to endorse or promote products derived from -// this software without specific prior written permission. -// -// 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. -// -// Various type stubs for the open-source version of Snappy. -// -// This file cannot include config.h, as it is included from snappy.h, -// which is a public header. Instead, snappy-stubs-public.h is generated by -// from snappy-stubs-public.h.in at configure time. - -#ifndef UTIL_SNAPPY_OPENSOURCE_SNAPPY_STUBS_PUBLIC_H_ -#define UTIL_SNAPPY_OPENSOURCE_SNAPPY_STUBS_PUBLIC_H_ - -#if 1 -#include -#endif - -#if 1 -#include -#endif - -#if 0 -#include -#endif - -#define SNAPPY_MAJOR 1 -#define SNAPPY_MINOR 1 -#define SNAPPY_PATCHLEVEL 1 -#define SNAPPY_VERSION \ - ((SNAPPY_MAJOR << 16) | (SNAPPY_MINOR << 8) | SNAPPY_PATCHLEVEL) - -#include - -namespace snappy { - -#if 1 -typedef int8_t int8; -typedef uint8_t uint8; -typedef int16_t int16; -typedef uint16_t uint16; -typedef int32_t int32; -typedef uint32_t uint32; -typedef int64_t int64; -typedef uint64_t uint64; -#else -typedef signed char int8; -typedef unsigned char uint8; -typedef short int16; -typedef unsigned short uint16; -typedef int int32; -typedef unsigned int uint32; -typedef long long int64; -typedef unsigned long long uint64; -#endif - -typedef std::string string; - -#define DISALLOW_COPY_AND_ASSIGN(TypeName) \ - TypeName(const TypeName&); \ - void operator=(const TypeName&) - -#if !0 -// Windows does not have an iovec type, yet the concept is universally useful. -// It is simple to define it ourselves, so we put it inside our own namespace. -struct iovec { - void* iov_base; - size_t iov_len; -}; -#endif - -} // namespace snappy - -#endif // UTIL_SNAPPY_OPENSOURCE_SNAPPY_STUBS_PUBLIC_H_ diff --git a/utils/compress/snappy.cpp b/utils/compress/snappy.cpp deleted file mode 100644 index 1072f92dd..000000000 --- a/utils/compress/snappy.cpp +++ /dev/null @@ -1,1306 +0,0 @@ -// Copyright 2005 Google Inc. All Rights Reserved. -// -// 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. -// * Neither the name of Google Inc. nor the names of its -// contributors may be used to endorse or promote products derived from -// this software without specific prior written permission. -// -// 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. - -#include "snappy.h" -#include "snappy-internal.h" -#include "snappy-sinksource.h" - -#include - -#include -#include -#include - - -namespace snappy { - -// Any hash function will produce a valid compressed bitstream, but a good -// hash function reduces the number of collisions and thus yields better -// compression for compressible input, and more speed for incompressible -// input. Of course, it doesn't hurt if the hash function is reasonably fast -// either, as it gets called a lot. -static inline uint32 HashBytes(uint32 bytes, int shift) { - uint32 kMul = 0x1e35a7bd; - return (bytes * kMul) >> shift; -} -static inline uint32 Hash(const char* p, int shift) { - return HashBytes(UNALIGNED_LOAD32(p), shift); -} - -size_t MaxCompressedLength(size_t source_len) { - // Compressed data can be defined as: - // compressed := item* literal* - // item := literal* copy - // - // The trailing literal sequence has a space blowup of at most 62/60 - // since a literal of length 60 needs one tag byte + one extra byte - // for length information. - // - // Item blowup is trickier to measure. Suppose the "copy" op copies - // 4 bytes of data. Because of a special check in the encoding code, - // we produce a 4-byte copy only if the offset is < 65536. Therefore - // the copy op takes 3 bytes to encode, and this type of item leads - // to at most the 62/60 blowup for representing literals. - // - // Suppose the "copy" op copies 5 bytes of data. If the offset is big - // enough, it will take 5 bytes to encode the copy op. Therefore the - // worst case here is a one-byte literal followed by a five-byte copy. - // I.e., 6 bytes of input turn into 7 bytes of "compressed" data. - // - // This last factor dominates the blowup, so the final estimate is: - return 32 + source_len + source_len/6; -} - -enum { - LITERAL = 0, - COPY_1_BYTE_OFFSET = 1, // 3 bit length + 3 bits of offset in opcode - COPY_2_BYTE_OFFSET = 2, - COPY_4_BYTE_OFFSET = 3 -}; -static const int kMaximumTagLength = 5; // COPY_4_BYTE_OFFSET plus the actual offset. - -// Copy "len" bytes from "src" to "op", one byte at a time. Used for -// handling COPY operations where the input and output regions may -// overlap. For example, suppose: -// src == "ab" -// op == src + 2 -// len == 20 -// After IncrementalCopy(src, op, len), the result will have -// eleven copies of "ab" -// ababababababababababab -// Note that this does not match the semantics of either memcpy() -// or memmove(). -static inline void IncrementalCopy(const char* src, char* op, ssize_t len) { - assert(len > 0); - do { - *op++ = *src++; - } while (--len > 0); -} - -// Equivalent to IncrementalCopy except that it can write up to ten extra -// bytes after the end of the copy, and that it is faster. -// -// The main part of this loop is a simple copy of eight bytes at a time until -// we've copied (at least) the requested amount of bytes. However, if op and -// src are less than eight bytes apart (indicating a repeating pattern of -// length < 8), we first need to expand the pattern in order to get the correct -// results. For instance, if the buffer looks like this, with the eight-byte -// and patterns marked as intervals: -// -// abxxxxxxxxxxxx -// [------] src -// [------] op -// -// a single eight-byte copy from to will repeat the pattern once, -// after which we can move two bytes without moving : -// -// ababxxxxxxxxxx -// [------] src -// [------] op -// -// and repeat the exercise until the two no longer overlap. -// -// This allows us to do very well in the special case of one single byte -// repeated many times, without taking a big hit for more general cases. -// -// The worst case of extra writing past the end of the match occurs when -// op - src == 1 and len == 1; the last copy will read from byte positions -// [0..7] and write to [4..11], whereas it was only supposed to write to -// position 1. Thus, ten excess bytes. - -namespace { - -const int kMaxIncrementCopyOverflow = 10; - -inline void IncrementalCopyFastPath(const char* src, char* op, ssize_t len) { - while (op - src < 8) { - UnalignedCopy64(src, op); - len -= op - src; - op += op - src; - } - while (len > 0) { - UnalignedCopy64(src, op); - src += 8; - op += 8; - len -= 8; - } -} - -} // namespace - -static inline char* EmitLiteral(char* op, - const char* literal, - int len, - bool allow_fast_path) { - int n = len - 1; // Zero-length literals are disallowed - if (n < 60) { - // Fits in tag byte - *op++ = LITERAL | (n << 2); - - // The vast majority of copies are below 16 bytes, for which a - // call to memcpy is overkill. This fast path can sometimes - // copy up to 15 bytes too much, but that is okay in the - // main loop, since we have a bit to go on for both sides: - // - // - The input will always have kInputMarginBytes = 15 extra - // available bytes, as long as we're in the main loop, and - // if not, allow_fast_path = false. - // - The output will always have 32 spare bytes (see - // MaxCompressedLength). - if (allow_fast_path && len <= 16) { - UnalignedCopy64(literal, op); - UnalignedCopy64(literal + 8, op + 8); - return op + len; - } - } else { - // Encode in upcoming bytes - char* base = op; - int count = 0; - op++; - while (n > 0) { - *op++ = n & 0xff; - n >>= 8; - count++; - } - assert(count >= 1); - assert(count <= 4); - *base = LITERAL | ((59+count) << 2); - } - memcpy(op, literal, len); - return op + len; -} - -static inline char* EmitCopyLessThan64(char* op, size_t offset, int len) { - assert(len <= 64); - assert(len >= 4); - assert(offset < 65536); - - if ((len < 12) && (offset < 2048)) { - size_t len_minus_4 = len - 4; - assert(len_minus_4 < 8); // Must fit in 3 bits - *op++ = COPY_1_BYTE_OFFSET + ((len_minus_4) << 2) + ((offset >> 8) << 5); - *op++ = offset & 0xff; - } else { - *op++ = COPY_2_BYTE_OFFSET + ((len-1) << 2); - LittleEndian::Store16(op, offset); - op += 2; - } - return op; -} - -static inline char* EmitCopy(char* op, size_t offset, int len) { - // Emit 64 byte copies but make sure to keep at least four bytes reserved - while (len >= 68) { - op = EmitCopyLessThan64(op, offset, 64); - len -= 64; - } - - // Emit an extra 60 byte copy if have too much data to fit in one copy - if (len > 64) { - op = EmitCopyLessThan64(op, offset, 60); - len -= 60; - } - - // Emit remainder - op = EmitCopyLessThan64(op, offset, len); - return op; -} - - -bool GetUncompressedLength(const char* start, size_t n, size_t* result) { - uint32 v = 0; - const char* limit = start + n; - if (Varint::Parse32WithLimit(start, limit, &v) != NULL) { - *result = v; - return true; - } else { - return false; - } -} - -namespace internal { -uint16* WorkingMemory::GetHashTable(size_t input_size, int* table_size) { - // Use smaller hash table when input.size() is smaller, since we - // fill the table, incurring O(hash table size) overhead for - // compression, and if the input is short, we won't need that - // many hash table entries anyway. - assert(kMaxHashTableSize >= 256); - size_t htsize = 256; - while (htsize < kMaxHashTableSize && htsize < input_size) { - htsize <<= 1; - } - - uint16* table; - if (htsize <= ARRAYSIZE(small_table_)) { - table = small_table_; - } else { - if (large_table_ == NULL) { - large_table_ = new uint16[kMaxHashTableSize]; - } - table = large_table_; - } - - *table_size = htsize; - memset(table, 0, htsize * sizeof(*table)); - return table; -} -} // end namespace internal - -// For 0 <= offset <= 4, GetUint32AtOffset(GetEightBytesAt(p), offset) will -// equal UNALIGNED_LOAD32(p + offset). Motivation: On x86-64 hardware we have -// empirically found that overlapping loads such as -// UNALIGNED_LOAD32(p) ... UNALIGNED_LOAD32(p+1) ... UNALIGNED_LOAD32(p+2) -// are slower than UNALIGNED_LOAD64(p) followed by shifts and casts to uint32. -// -// We have different versions for 64- and 32-bit; ideally we would avoid the -// two functions and just inline the UNALIGNED_LOAD64 call into -// GetUint32AtOffset, but GCC (at least not as of 4.6) is seemingly not clever -// enough to avoid loading the value multiple times then. For 64-bit, the load -// is done when GetEightBytesAt() is called, whereas for 32-bit, the load is -// done at GetUint32AtOffset() time. - -#ifdef ARCH_K8 - -typedef uint64 EightBytesReference; - -static inline EightBytesReference GetEightBytesAt(const char* ptr) { - return UNALIGNED_LOAD64(ptr); -} - -static inline uint32 GetUint32AtOffset(uint64 v, int offset) { - assert(offset >= 0); - assert(offset <= 4); - return v >> (LittleEndian::IsLittleEndian() ? 8 * offset : 32 - 8 * offset); -} - -#else - -typedef const char* EightBytesReference; - -static inline EightBytesReference GetEightBytesAt(const char* ptr) { - return ptr; -} - -static inline uint32 GetUint32AtOffset(const char* v, int offset) { - assert(offset >= 0); - assert(offset <= 4); - return UNALIGNED_LOAD32(v + offset); -} - -#endif - -// Flat array compression that does not emit the "uncompressed length" -// prefix. Compresses "input" string to the "*op" buffer. -// -// REQUIRES: "input" is at most "kBlockSize" bytes long. -// REQUIRES: "op" points to an array of memory that is at least -// "MaxCompressedLength(input.size())" in size. -// REQUIRES: All elements in "table[0..table_size-1]" are initialized to zero. -// REQUIRES: "table_size" is a power of two -// -// Returns an "end" pointer into "op" buffer. -// "end - op" is the compressed size of "input". -namespace internal { -char* CompressFragment(const char* input, - size_t input_size, - char* op, - uint16* table, - const int table_size) { - // "ip" is the input pointer, and "op" is the output pointer. - const char* ip = input; - assert(input_size <= kBlockSize); - assert((table_size & (table_size - 1)) == 0); // table must be power of two - const int shift = 32 - Bits::Log2Floor(table_size); - assert(static_cast(kuint32max >> shift) == table_size - 1); - const char* ip_end = input + input_size; - const char* base_ip = ip; - // Bytes in [next_emit, ip) will be emitted as literal bytes. Or - // [next_emit, ip_end) after the main loop. - const char* next_emit = ip; - - const size_t kInputMarginBytes = 15; - if (PREDICT_TRUE(input_size >= kInputMarginBytes)) { - const char* ip_limit = input + input_size - kInputMarginBytes; - - for (uint32 next_hash = Hash(++ip, shift); ; ) { - assert(next_emit < ip); - // The body of this loop calls EmitLiteral once and then EmitCopy one or - // more times. (The exception is that when we're close to exhausting - // the input we goto emit_remainder.) - // - // In the first iteration of this loop we're just starting, so - // there's nothing to copy, so calling EmitLiteral once is - // necessary. And we only start a new iteration when the - // current iteration has determined that a call to EmitLiteral will - // precede the next call to EmitCopy (if any). - // - // Step 1: Scan forward in the input looking for a 4-byte-long match. - // If we get close to exhausting the input then goto emit_remainder. - // - // Heuristic match skipping: If 32 bytes are scanned with no matches - // found, start looking only at every other byte. If 32 more bytes are - // scanned, look at every third byte, etc.. When a match is found, - // immediately go back to looking at every byte. This is a small loss - // (~5% performance, ~0.1% density) for compressible data due to more - // bookkeeping, but for non-compressible data (such as JPEG) it's a huge - // win since the compressor quickly "realizes" the data is incompressible - // and doesn't bother looking for matches everywhere. - // - // The "skip" variable keeps track of how many bytes there are since the - // last match; dividing it by 32 (ie. right-shifting by five) gives the - // number of bytes to move ahead for each iteration. - uint32 skip = 32; - - const char* next_ip = ip; - const char* candidate; - do { - ip = next_ip; - uint32 hash = next_hash; - assert(hash == Hash(ip, shift)); - uint32 bytes_between_hash_lookups = skip++ >> 5; - next_ip = ip + bytes_between_hash_lookups; - if (PREDICT_FALSE(next_ip > ip_limit)) { - goto emit_remainder; - } - next_hash = Hash(next_ip, shift); - candidate = base_ip + table[hash]; - assert(candidate >= base_ip); - assert(candidate < ip); - - table[hash] = ip - base_ip; - } while (PREDICT_TRUE(UNALIGNED_LOAD32(ip) != - UNALIGNED_LOAD32(candidate))); - - // Step 2: A 4-byte match has been found. We'll later see if more - // than 4 bytes match. But, prior to the match, input - // bytes [next_emit, ip) are unmatched. Emit them as "literal bytes." - assert(next_emit + 16 <= ip_end); - op = EmitLiteral(op, next_emit, ip - next_emit, true); - - // Step 3: Call EmitCopy, and then see if another EmitCopy could - // be our next move. Repeat until we find no match for the - // input immediately after what was consumed by the last EmitCopy call. - // - // If we exit this loop normally then we need to call EmitLiteral next, - // though we don't yet know how big the literal will be. We handle that - // by proceeding to the next iteration of the main loop. We also can exit - // this loop via goto if we get close to exhausting the input. - EightBytesReference input_bytes; - uint32 candidate_bytes = 0; - - do { - // We have a 4-byte match at ip, and no need to emit any - // "literal bytes" prior to ip. - const char* base = ip; - int matched = 4 + FindMatchLength(candidate + 4, ip + 4, ip_end); - ip += matched; - size_t offset = base - candidate; - assert(0 == memcmp(base, candidate, matched)); - op = EmitCopy(op, offset, matched); - // We could immediately start working at ip now, but to improve - // compression we first update table[Hash(ip - 1, ...)]. - const char* insert_tail = ip - 1; - next_emit = ip; - if (PREDICT_FALSE(ip >= ip_limit)) { - goto emit_remainder; - } - input_bytes = GetEightBytesAt(insert_tail); - uint32 prev_hash = HashBytes(GetUint32AtOffset(input_bytes, 0), shift); - table[prev_hash] = ip - base_ip - 1; - uint32 cur_hash = HashBytes(GetUint32AtOffset(input_bytes, 1), shift); - candidate = base_ip + table[cur_hash]; - candidate_bytes = UNALIGNED_LOAD32(candidate); - table[cur_hash] = ip - base_ip; - } while (GetUint32AtOffset(input_bytes, 1) == candidate_bytes); - - next_hash = HashBytes(GetUint32AtOffset(input_bytes, 2), shift); - ++ip; - } - } - - emit_remainder: - // Emit the remaining bytes as a literal - if (next_emit < ip_end) { - op = EmitLiteral(op, next_emit, ip_end - next_emit, false); - } - - return op; -} -} // end namespace internal - -// Signature of output types needed by decompression code. -// The decompression code is templatized on a type that obeys this -// signature so that we do not pay virtual function call overhead in -// the middle of a tight decompression loop. -// -// class DecompressionWriter { -// public: -// // Called before decompression -// void SetExpectedLength(size_t length); -// -// // Called after decompression -// bool CheckLength() const; -// -// // Called repeatedly during decompression -// bool Append(const char* ip, size_t length); -// bool AppendFromSelf(uint32 offset, size_t length); -// -// // The rules for how TryFastAppend differs from Append are somewhat -// // convoluted: -// // -// // - TryFastAppend is allowed to decline (return false) at any -// // time, for any reason -- just "return false" would be -// // a perfectly legal implementation of TryFastAppend. -// // The intention is for TryFastAppend to allow a fast path -// // in the common case of a small append. -// // - TryFastAppend is allowed to read up to bytes -// // from the input buffer, whereas Append is allowed to read -// // . However, if it returns true, it must leave -// // at least five (kMaximumTagLength) bytes in the input buffer -// // afterwards, so that there is always enough space to read the -// // next tag without checking for a refill. -// // - TryFastAppend must always return decline (return false) -// // if is 61 or more, as in this case the literal length is not -// // decoded fully. In practice, this should not be a big problem, -// // as it is unlikely that one would implement a fast path accepting -// // this much data. -// // -// bool TryFastAppend(const char* ip, size_t available, size_t length); -// }; - -// ----------------------------------------------------------------------- -// Lookup table for decompression code. Generated by ComputeTable() below. -// ----------------------------------------------------------------------- - -// Mapping from i in range [0,4] to a mask to extract the bottom 8*i bits -static const uint32 wordmask[] = { - 0u, 0xffu, 0xffffu, 0xffffffu, 0xffffffffu -}; - -// Data stored per entry in lookup table: -// Range Bits-used Description -// ------------------------------------ -// 1..64 0..7 Literal/copy length encoded in opcode byte -// 0..7 8..10 Copy offset encoded in opcode byte / 256 -// 0..4 11..13 Extra bytes after opcode -// -// We use eight bits for the length even though 7 would have sufficed -// because of efficiency reasons: -// (1) Extracting a byte is faster than a bit-field -// (2) It properly aligns copy offset so we do not need a <<8 -static const uint16 char_table[256] = { - 0x0001, 0x0804, 0x1001, 0x2001, 0x0002, 0x0805, 0x1002, 0x2002, - 0x0003, 0x0806, 0x1003, 0x2003, 0x0004, 0x0807, 0x1004, 0x2004, - 0x0005, 0x0808, 0x1005, 0x2005, 0x0006, 0x0809, 0x1006, 0x2006, - 0x0007, 0x080a, 0x1007, 0x2007, 0x0008, 0x080b, 0x1008, 0x2008, - 0x0009, 0x0904, 0x1009, 0x2009, 0x000a, 0x0905, 0x100a, 0x200a, - 0x000b, 0x0906, 0x100b, 0x200b, 0x000c, 0x0907, 0x100c, 0x200c, - 0x000d, 0x0908, 0x100d, 0x200d, 0x000e, 0x0909, 0x100e, 0x200e, - 0x000f, 0x090a, 0x100f, 0x200f, 0x0010, 0x090b, 0x1010, 0x2010, - 0x0011, 0x0a04, 0x1011, 0x2011, 0x0012, 0x0a05, 0x1012, 0x2012, - 0x0013, 0x0a06, 0x1013, 0x2013, 0x0014, 0x0a07, 0x1014, 0x2014, - 0x0015, 0x0a08, 0x1015, 0x2015, 0x0016, 0x0a09, 0x1016, 0x2016, - 0x0017, 0x0a0a, 0x1017, 0x2017, 0x0018, 0x0a0b, 0x1018, 0x2018, - 0x0019, 0x0b04, 0x1019, 0x2019, 0x001a, 0x0b05, 0x101a, 0x201a, - 0x001b, 0x0b06, 0x101b, 0x201b, 0x001c, 0x0b07, 0x101c, 0x201c, - 0x001d, 0x0b08, 0x101d, 0x201d, 0x001e, 0x0b09, 0x101e, 0x201e, - 0x001f, 0x0b0a, 0x101f, 0x201f, 0x0020, 0x0b0b, 0x1020, 0x2020, - 0x0021, 0x0c04, 0x1021, 0x2021, 0x0022, 0x0c05, 0x1022, 0x2022, - 0x0023, 0x0c06, 0x1023, 0x2023, 0x0024, 0x0c07, 0x1024, 0x2024, - 0x0025, 0x0c08, 0x1025, 0x2025, 0x0026, 0x0c09, 0x1026, 0x2026, - 0x0027, 0x0c0a, 0x1027, 0x2027, 0x0028, 0x0c0b, 0x1028, 0x2028, - 0x0029, 0x0d04, 0x1029, 0x2029, 0x002a, 0x0d05, 0x102a, 0x202a, - 0x002b, 0x0d06, 0x102b, 0x202b, 0x002c, 0x0d07, 0x102c, 0x202c, - 0x002d, 0x0d08, 0x102d, 0x202d, 0x002e, 0x0d09, 0x102e, 0x202e, - 0x002f, 0x0d0a, 0x102f, 0x202f, 0x0030, 0x0d0b, 0x1030, 0x2030, - 0x0031, 0x0e04, 0x1031, 0x2031, 0x0032, 0x0e05, 0x1032, 0x2032, - 0x0033, 0x0e06, 0x1033, 0x2033, 0x0034, 0x0e07, 0x1034, 0x2034, - 0x0035, 0x0e08, 0x1035, 0x2035, 0x0036, 0x0e09, 0x1036, 0x2036, - 0x0037, 0x0e0a, 0x1037, 0x2037, 0x0038, 0x0e0b, 0x1038, 0x2038, - 0x0039, 0x0f04, 0x1039, 0x2039, 0x003a, 0x0f05, 0x103a, 0x203a, - 0x003b, 0x0f06, 0x103b, 0x203b, 0x003c, 0x0f07, 0x103c, 0x203c, - 0x0801, 0x0f08, 0x103d, 0x203d, 0x1001, 0x0f09, 0x103e, 0x203e, - 0x1801, 0x0f0a, 0x103f, 0x203f, 0x2001, 0x0f0b, 0x1040, 0x2040 -}; - -// In debug mode, allow optional computation of the table at startup. -// Also, check that the decompression table is correct. -#ifndef NDEBUG -DEFINE_bool(snappy_dump_decompression_table, false, - "If true, we print the decompression table at startup."); - -static uint16 MakeEntry(unsigned int extra, - unsigned int len, - unsigned int copy_offset) { - // Check that all of the fields fit within the allocated space - assert(extra == (extra & 0x7)); // At most 3 bits - assert(copy_offset == (copy_offset & 0x7)); // At most 3 bits - assert(len == (len & 0x7f)); // At most 7 bits - return len | (copy_offset << 8) | (extra << 11); -} - -static void ComputeTable() { - uint16 dst[256]; - - // Place invalid entries in all places to detect missing initialization - int assigned = 0; - for (int i = 0; i < 256; i++) { - dst[i] = 0xffff; - } - - // Small LITERAL entries. We store (len-1) in the top 6 bits. - for (unsigned int len = 1; len <= 60; len++) { - dst[LITERAL | ((len-1) << 2)] = MakeEntry(0, len, 0); - assigned++; - } - - // Large LITERAL entries. We use 60..63 in the high 6 bits to - // encode the number of bytes of length info that follow the opcode. - for (unsigned int extra_bytes = 1; extra_bytes <= 4; extra_bytes++) { - // We set the length field in the lookup table to 1 because extra - // bytes encode len-1. - dst[LITERAL | ((extra_bytes+59) << 2)] = MakeEntry(extra_bytes, 1, 0); - assigned++; - } - - // COPY_1_BYTE_OFFSET. - // - // The tag byte in the compressed data stores len-4 in 3 bits, and - // offset/256 in 5 bits. offset%256 is stored in the next byte. - // - // This format is used for length in range [4..11] and offset in - // range [0..2047] - for (unsigned int len = 4; len < 12; len++) { - for (unsigned int offset = 0; offset < 2048; offset += 256) { - dst[COPY_1_BYTE_OFFSET | ((len-4)<<2) | ((offset>>8)<<5)] = - MakeEntry(1, len, offset>>8); - assigned++; - } - } - - // COPY_2_BYTE_OFFSET. - // Tag contains len-1 in top 6 bits, and offset in next two bytes. - for (unsigned int len = 1; len <= 64; len++) { - dst[COPY_2_BYTE_OFFSET | ((len-1)<<2)] = MakeEntry(2, len, 0); - assigned++; - } - - // COPY_4_BYTE_OFFSET. - // Tag contents len-1 in top 6 bits, and offset in next four bytes. - for (unsigned int len = 1; len <= 64; len++) { - dst[COPY_4_BYTE_OFFSET | ((len-1)<<2)] = MakeEntry(4, len, 0); - assigned++; - } - - // Check that each entry was initialized exactly once. - if (assigned != 256) { - fprintf(stderr, "ComputeTable: assigned only %d of 256\n", assigned); - abort(); - } - for (int i = 0; i < 256; i++) { - if (dst[i] == 0xffff) { - fprintf(stderr, "ComputeTable: did not assign byte %d\n", i); - abort(); - } - } - - if (FLAGS_snappy_dump_decompression_table) { - printf("static const uint16 char_table[256] = {\n "); - for (int i = 0; i < 256; i++) { - printf("0x%04x%s", - dst[i], - ((i == 255) ? "\n" : (((i%8) == 7) ? ",\n " : ", "))); - } - printf("};\n"); - } - - // Check that computed table matched recorded table - for (int i = 0; i < 256; i++) { - if (dst[i] != char_table[i]) { - fprintf(stderr, "ComputeTable: byte %d: computed (%x), expect (%x)\n", - i, static_cast(dst[i]), static_cast(char_table[i])); - abort(); - } - } -} -#endif /* !NDEBUG */ - -// Helper class for decompression -class SnappyDecompressor { - private: - Source* reader_; // Underlying source of bytes to decompress - const char* ip_; // Points to next buffered byte - const char* ip_limit_; // Points just past buffered bytes - uint32 peeked_; // Bytes peeked from reader (need to skip) - bool eof_; // Hit end of input without an error? - char scratch_[kMaximumTagLength]; // See RefillTag(). - - // Ensure that all of the tag metadata for the next tag is available - // in [ip_..ip_limit_-1]. Also ensures that [ip,ip+4] is readable even - // if (ip_limit_ - ip_ < 5). - // - // Returns true on success, false on error or end of input. - bool RefillTag(); - - public: - explicit SnappyDecompressor(Source* reader) - : reader_(reader), - ip_(NULL), - ip_limit_(NULL), - peeked_(0), - eof_(false) { - } - - ~SnappyDecompressor() { - // Advance past any bytes we peeked at from the reader - reader_->Skip(peeked_); - } - - // Returns true iff we have hit the end of the input without an error. - bool eof() const { - return eof_; - } - - // Read the uncompressed length stored at the start of the compressed data. - // On succcess, stores the length in *result and returns true. - // On failure, returns false. - bool ReadUncompressedLength(uint32* result) { - assert(ip_ == NULL); // Must not have read anything yet - // Length is encoded in 1..5 bytes - *result = 0; - uint32 shift = 0; - while (true) { - if (shift >= 32) return false; - size_t n; - const char* ip = reader_->Peek(&n); - if (n == 0) return false; - const unsigned char c = *(reinterpret_cast(ip)); - reader_->Skip(1); - *result |= static_cast(c & 0x7f) << shift; - if (c < 128) { - break; - } - shift += 7; - } - return true; - } - - // Process the next item found in the input. - // Returns true if successful, false on error or end of input. - template - void DecompressAllTags(Writer* writer) { - const char* ip = ip_; - - // We could have put this refill fragment only at the beginning of the loop. - // However, duplicating it at the end of each branch gives the compiler more - // scope to optimize the expression based on the local - // context, which overall increases speed. - #define MAYBE_REFILL() \ - if (ip_limit_ - ip < kMaximumTagLength) { \ - ip_ = ip; \ - if (!RefillTag()) return; \ - ip = ip_; \ - } - - MAYBE_REFILL(); - for ( ;; ) { - const unsigned char c = *(reinterpret_cast(ip++)); - - if ((c & 0x3) == LITERAL) { - size_t literal_length = (c >> 2) + 1u; - if (writer->TryFastAppend(ip, ip_limit_ - ip, literal_length)) { - assert(literal_length < 61); - ip += literal_length; - // NOTE(user): There is no MAYBE_REFILL() here, as TryFastAppend() - // will not return true unless there's already at least five spare - // bytes in addition to the literal. - continue; - } - if (PREDICT_FALSE(literal_length >= 61)) { - // Long literal. - const size_t literal_length_length = literal_length - 60; - literal_length = - (LittleEndian::Load32(ip) & wordmask[literal_length_length]) + 1; - ip += literal_length_length; - } - - size_t avail = ip_limit_ - ip; - while (avail < literal_length) { - if (!writer->Append(ip, avail)) return; - literal_length -= avail; - reader_->Skip(peeked_); - size_t n; - ip = reader_->Peek(&n); - avail = n; - peeked_ = avail; - if (avail == 0) return; // Premature end of input - ip_limit_ = ip + avail; - } - if (!writer->Append(ip, literal_length)) { - return; - } - ip += literal_length; - MAYBE_REFILL(); - } else { - const uint32 entry = char_table[c]; - const uint32 trailer = LittleEndian::Load32(ip) & wordmask[entry >> 11]; - const uint32 length = entry & 0xff; - ip += entry >> 11; - - // copy_offset/256 is encoded in bits 8..10. By just fetching - // those bits, we get copy_offset (since the bit-field starts at - // bit 8). - const uint32 copy_offset = entry & 0x700; - if (!writer->AppendFromSelf(copy_offset + trailer, length)) { - return; - } - MAYBE_REFILL(); - } - } - -#undef MAYBE_REFILL - } -}; - -bool SnappyDecompressor::RefillTag() { - const char* ip = ip_; - if (ip == ip_limit_) { - // Fetch a new fragment from the reader - reader_->Skip(peeked_); // All peeked bytes are used up - size_t n; - ip = reader_->Peek(&n); - peeked_ = n; - if (n == 0) { - eof_ = true; - return false; - } - ip_limit_ = ip + n; - } - - // Read the tag character - assert(ip < ip_limit_); - const unsigned char c = *(reinterpret_cast(ip)); - const uint32 entry = char_table[c]; - const uint32 needed = (entry >> 11) + 1; // +1 byte for 'c' - assert(needed <= sizeof(scratch_)); - - // Read more bytes from reader if needed - uint32 nbuf = ip_limit_ - ip; - if (nbuf < needed) { - // Stitch together bytes from ip and reader to form the word - // contents. We store the needed bytes in "scratch_". They - // will be consumed immediately by the caller since we do not - // read more than we need. - memmove(scratch_, ip, nbuf); - reader_->Skip(peeked_); // All peeked bytes are used up - peeked_ = 0; - while (nbuf < needed) { - size_t length; - const char* src = reader_->Peek(&length); - if (length == 0) return false; - uint32 to_add = min(needed - nbuf, length); - memcpy(scratch_ + nbuf, src, to_add); - nbuf += to_add; - reader_->Skip(to_add); - } - assert(nbuf == needed); - ip_ = scratch_; - ip_limit_ = scratch_ + needed; - } else if ((signed)nbuf < kMaximumTagLength) { - // Have enough bytes, but move into scratch_ so that we do not - // read past end of input - memmove(scratch_, ip, nbuf); - reader_->Skip(peeked_); // All peeked bytes are used up - peeked_ = 0; - ip_ = scratch_; - ip_limit_ = scratch_ + nbuf; - } else { - // Pass pointer to buffer returned by reader_. - ip_ = ip; - } - return true; -} - -template -static bool InternalUncompress(Source* r, Writer* writer) { - // Read the uncompressed length from the front of the compressed input - SnappyDecompressor decompressor(r); - uint32 uncompressed_len = 0; - if (!decompressor.ReadUncompressedLength(&uncompressed_len)) return false; - return InternalUncompressAllTags(&decompressor, writer, uncompressed_len); -} - -template -static bool InternalUncompressAllTags(SnappyDecompressor* decompressor, - Writer* writer, - uint32 uncompressed_len) { - writer->SetExpectedLength(uncompressed_len); - - // Process the entire input - decompressor->DecompressAllTags(writer); - return (decompressor->eof() && writer->CheckLength()); -} - -bool GetUncompressedLength(Source* source, uint32* result) { - SnappyDecompressor decompressor(source); - return decompressor.ReadUncompressedLength(result); -} - -size_t Compress(Source* reader, Sink* writer) { - size_t written = 0; - size_t N = reader->Available(); - char ulength[Varint::kMax32]; - char* p = Varint::Encode32(ulength, N); - writer->Append(ulength, p-ulength); - written += (p - ulength); - - internal::WorkingMemory wmem; - char* scratch = NULL; - char* scratch_output = NULL; - - while (N > 0) { - // Get next block to compress (without copying if possible) - size_t fragment_size; - const char* fragment = reader->Peek(&fragment_size); - assert(fragment_size != 0); // premature end of input - const size_t num_to_read = min(N, kBlockSize); - size_t bytes_read = fragment_size; - - size_t pending_advance = 0; - if (bytes_read >= num_to_read) { - // Buffer returned by reader is large enough - pending_advance = num_to_read; - fragment_size = num_to_read; - } else { - // Read into scratch buffer - if (scratch == NULL) { - // If this is the last iteration, we want to allocate N bytes - // of space, otherwise the max possible kBlockSize space. - // num_to_read contains exactly the correct value - scratch = new char[num_to_read]; - } - memcpy(scratch, fragment, bytes_read); - reader->Skip(bytes_read); - - while (bytes_read < num_to_read) { - fragment = reader->Peek(&fragment_size); - size_t n = min(fragment_size, num_to_read - bytes_read); - memcpy(scratch + bytes_read, fragment, n); - bytes_read += n; - reader->Skip(n); - } - assert(bytes_read == num_to_read); - fragment = scratch; - fragment_size = num_to_read; - } - assert(fragment_size == num_to_read); - - // Get encoding table for compression - int table_size; - uint16* table = wmem.GetHashTable(num_to_read, &table_size); - - // Compress input_fragment and append to dest - const int max_output = MaxCompressedLength(num_to_read); - - // Need a scratch buffer for the output, in case the byte sink doesn't - // have room for us directly. - if (scratch_output == NULL) { - scratch_output = new char[max_output]; - } else { - // Since we encode kBlockSize regions followed by a region - // which is <= kBlockSize in length, a previously allocated - // scratch_output[] region is big enough for this iteration. - } - char* dest = writer->GetAppendBuffer(max_output, scratch_output); - char* end = internal::CompressFragment(fragment, fragment_size, - dest, table, table_size); - writer->Append(dest, end - dest); - written += (end - dest); - - N -= num_to_read; - reader->Skip(pending_advance); - } - - delete[] scratch; - delete[] scratch_output; - - return written; -} - -// ----------------------------------------------------------------------- -// IOVec interfaces -// ----------------------------------------------------------------------- - -// A type that writes to an iovec. -// Note that this is not a "ByteSink", but a type that matches the -// Writer template argument to SnappyDecompressor::DecompressAllTags(). -class SnappyIOVecWriter { - private: - const struct iovec* output_iov_; - const size_t output_iov_count_; - - // We are currently writing into output_iov_[curr_iov_index_]. - int curr_iov_index_; - - // Bytes written to output_iov_[curr_iov_index_] so far. - size_t curr_iov_written_; - - // Total bytes decompressed into output_iov_ so far. - size_t total_written_; - - // Maximum number of bytes that will be decompressed into output_iov_. - size_t output_limit_; - - inline char* GetIOVecPointer(int index, size_t offset) { - return reinterpret_cast(output_iov_[index].iov_base) + - offset; - } - - public: - // Does not take ownership of iov. iov must be valid during the - // entire lifetime of the SnappyIOVecWriter. - inline SnappyIOVecWriter(const struct iovec* iov, size_t iov_count) - : output_iov_(iov), - output_iov_count_(iov_count), - curr_iov_index_(0), - curr_iov_written_(0), - total_written_(0), - output_limit_(-1) { - } - - inline void SetExpectedLength(size_t len) { - output_limit_ = len; - } - - inline bool CheckLength() const { - return total_written_ == output_limit_; - } - - inline bool Append(const char* ip, size_t len) { - if (total_written_ + len > output_limit_) { - return false; - } - - while (len > 0) { - assert(curr_iov_written_ <= output_iov_[curr_iov_index_].iov_len); - if (curr_iov_written_ >= output_iov_[curr_iov_index_].iov_len) { - // This iovec is full. Go to the next one. - if ((unsigned)curr_iov_index_ + 1 >= output_iov_count_) { - return false; - } - curr_iov_written_ = 0; - ++curr_iov_index_; - } - - const size_t to_write = std::min( - len, output_iov_[curr_iov_index_].iov_len - curr_iov_written_); - memcpy(GetIOVecPointer(curr_iov_index_, curr_iov_written_), - ip, - to_write); - curr_iov_written_ += to_write; - total_written_ += to_write; - ip += to_write; - len -= to_write; - } - - return true; - } - - inline bool TryFastAppend(const char* ip, size_t available, size_t len) { - const size_t space_left = output_limit_ - total_written_; - if (len <= 16 && available >= 16 + kMaximumTagLength && space_left >= 16 && - output_iov_[curr_iov_index_].iov_len - curr_iov_written_ >= 16) { - // Fast path, used for the majority (about 95%) of invocations. - char* ptr = GetIOVecPointer(curr_iov_index_, curr_iov_written_); - UnalignedCopy64(ip, ptr); - UnalignedCopy64(ip + 8, ptr + 8); - curr_iov_written_ += len; - total_written_ += len; - return true; - } - - return false; - } - - inline bool AppendFromSelf(size_t offset, size_t len) { - if (offset > total_written_ || offset == 0) { - return false; - } - const size_t space_left = output_limit_ - total_written_; - if (len > space_left) { - return false; - } - - // Locate the iovec from which we need to start the copy. - int from_iov_index = curr_iov_index_; - size_t from_iov_offset = curr_iov_written_; - while (offset > 0) { - if (from_iov_offset >= offset) { - from_iov_offset -= offset; - break; - } - - offset -= from_iov_offset; - --from_iov_index; - assert(from_iov_index >= 0); - from_iov_offset = output_iov_[from_iov_index].iov_len; - } - - // Copy bytes starting from the iovec pointed to by from_iov_index to - // the current iovec. - while (len > 0) { - assert(from_iov_index <= curr_iov_index_); - if (from_iov_index != curr_iov_index_) { - const size_t to_copy = std::min( - output_iov_[from_iov_index].iov_len - from_iov_offset, - len); - Append(GetIOVecPointer(from_iov_index, from_iov_offset), to_copy); - len -= to_copy; - if (len > 0) { - ++from_iov_index; - from_iov_offset = 0; - } - } else { - assert(curr_iov_written_ <= output_iov_[curr_iov_index_].iov_len); - size_t to_copy = std::min(output_iov_[curr_iov_index_].iov_len - - curr_iov_written_, - len); - if (to_copy == 0) { - // This iovec is full. Go to the next one. - if ((unsigned)curr_iov_index_ + 1 >= output_iov_count_) { - return false; - } - ++curr_iov_index_; - curr_iov_written_ = 0; - continue; - } - if (to_copy > len) { - to_copy = len; - } - IncrementalCopy(GetIOVecPointer(from_iov_index, from_iov_offset), - GetIOVecPointer(curr_iov_index_, curr_iov_written_), - to_copy); - curr_iov_written_ += to_copy; - from_iov_offset += to_copy; - total_written_ += to_copy; - len -= to_copy; - } - } - - return true; - } - -}; - -bool RawUncompressToIOVec(const char* compressed, size_t compressed_length, - const struct iovec* iov, size_t iov_cnt) { - ByteArraySource reader(compressed, compressed_length); - return RawUncompressToIOVec(&reader, iov, iov_cnt); -} - -bool RawUncompressToIOVec(Source* compressed, const struct iovec* iov, - size_t iov_cnt) { - SnappyIOVecWriter output(iov, iov_cnt); - return InternalUncompress(compressed, &output); -} - -// ----------------------------------------------------------------------- -// Flat array interfaces -// ----------------------------------------------------------------------- - -// A type that writes to a flat array. -// Note that this is not a "ByteSink", but a type that matches the -// Writer template argument to SnappyDecompressor::DecompressAllTags(). -class SnappyArrayWriter { - private: - char* base_; - char* op_; - char* op_limit_; - - public: - inline explicit SnappyArrayWriter(char* dst) - : base_(dst), - op_(dst) { - } - - inline void SetExpectedLength(size_t len) { - op_limit_ = op_ + len; - } - - inline bool CheckLength() const { - return op_ == op_limit_; - } - - inline bool Append(const char* ip, size_t len) { - char* op = op_; - const size_t space_left = op_limit_ - op; - if (space_left < len) { - return false; - } - memcpy(op, ip, len); - op_ = op + len; - return true; - } - - inline bool TryFastAppend(const char* ip, size_t available, size_t len) { - char* op = op_; - const size_t space_left = op_limit_ - op; - if (len <= 16 && available >= 16 + kMaximumTagLength && space_left >= 16) { - // Fast path, used for the majority (about 95%) of invocations. - UnalignedCopy64(ip, op); - UnalignedCopy64(ip + 8, op + 8); - op_ = op + len; - return true; - } else { - return false; - } - } - - inline bool AppendFromSelf(size_t offset, size_t len) { - char* op = op_; - const size_t space_left = op_limit_ - op; - - // Check if we try to append from before the start of the buffer. - // Normally this would just be a check for "produced < offset", - // but "produced <= offset - 1u" is equivalent for every case - // except the one where offset==0, where the right side will wrap around - // to a very big number. This is convenient, as offset==0 is another - // invalid case that we also want to catch, so that we do not go - // into an infinite loop. - assert(op >= base_); - size_t produced = op - base_; - if (produced <= offset - 1u) { - return false; - } - if (len <= 16 && offset >= 8 && space_left >= 16) { - // Fast path, used for the majority (70-80%) of dynamic invocations. - UnalignedCopy64(op - offset, op); - UnalignedCopy64(op - offset + 8, op + 8); - } else { - if (space_left >= len + kMaxIncrementCopyOverflow) { - IncrementalCopyFastPath(op - offset, op, len); - } else { - if (space_left < len) { - return false; - } - IncrementalCopy(op - offset, op, len); - } - } - - op_ = op + len; - return true; - } -}; - -bool RawUncompress(const char* compressed, size_t n, char* uncompressed) { - ByteArraySource reader(compressed, n); - return RawUncompress(&reader, uncompressed); -} - -bool RawUncompress(Source* compressed, char* uncompressed) { - SnappyArrayWriter output(uncompressed); - return InternalUncompress(compressed, &output); -} - -bool Uncompress(const char* compressed, size_t n, string* uncompressed) { - size_t ulength; - if (!GetUncompressedLength(compressed, n, &ulength)) { - return false; - } - // On 32-bit builds: max_size() < kuint32max. Check for that instead - // of crashing (e.g., consider externally specified compressed data). - if (ulength > uncompressed->max_size()) { - return false; - } - STLStringResizeUninitialized(uncompressed, ulength); - return RawUncompress(compressed, n, string_as_array(uncompressed)); -} - - -// A Writer that drops everything on the floor and just does validation -class SnappyDecompressionValidator { - private: - size_t expected_; - size_t produced_; - - public: - inline SnappyDecompressionValidator() : produced_(0) { } - inline void SetExpectedLength(size_t len) { - expected_ = len; - } - inline bool CheckLength() const { - return expected_ == produced_; - } - inline bool Append(const char* ip, size_t len) { - produced_ += len; - return produced_ <= expected_; - } - inline bool TryFastAppend(const char* ip, size_t available, size_t length) { - return false; - } - inline bool AppendFromSelf(size_t offset, size_t len) { - // See SnappyArrayWriter::AppendFromSelf for an explanation of - // the "offset - 1u" trick. - if (produced_ <= offset - 1u) return false; - produced_ += len; - return produced_ <= expected_; - } -}; - -bool IsValidCompressedBuffer(const char* compressed, size_t n) { - ByteArraySource reader(compressed, n); - SnappyDecompressionValidator writer; - return InternalUncompress(&reader, &writer); -} - -void RawCompress(const char* input, - size_t input_length, - char* compressed, - size_t* compressed_length) { - ByteArraySource reader(input, input_length); - UncheckedByteArraySink writer(compressed); - Compress(&reader, &writer); - - // Compute how many bytes were added - *compressed_length = (writer.CurrentDestination() - compressed); -} - -size_t Compress(const char* input, size_t input_length, string* compressed) { - // Pre-grow the buffer to the max length of the compressed output - compressed->resize(MaxCompressedLength(input_length)); - - size_t compressed_length; - RawCompress(input, input_length, string_as_array(compressed), - &compressed_length); - compressed->resize(compressed_length); - return compressed_length; -} - - -} // end namespace snappy - diff --git a/utils/compress/snappy.h b/utils/compress/snappy.h deleted file mode 100644 index e879e7949..000000000 --- a/utils/compress/snappy.h +++ /dev/null @@ -1,184 +0,0 @@ -// Copyright 2005 and onwards Google Inc. -// -// 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. -// * Neither the name of Google Inc. nor the names of its -// contributors may be used to endorse or promote products derived from -// this software without specific prior written permission. -// -// 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. -// -// A light-weight compression algorithm. It is designed for speed of -// compression and decompression, rather than for the utmost in space -// savings. -// -// For getting better compression ratios when you are compressing data -// with long repeated sequences or compressing data that is similar to -// other data, while still compressing fast, you might look at first -// using BMDiff and then compressing the output of BMDiff with -// Snappy. - -#ifndef UTIL_SNAPPY_SNAPPY_H__ -#define UTIL_SNAPPY_SNAPPY_H__ - -#include -#include - -#include "snappy-stubs-public.h" - -namespace snappy { - class Source; - class Sink; - - // ------------------------------------------------------------------------ - // Generic compression/decompression routines. - // ------------------------------------------------------------------------ - - // Compress the bytes read from "*source" and append to "*sink". Return the - // number of bytes written. - size_t Compress(Source* source, Sink* sink); - - // Find the uncompressed length of the given stream, as given by the header. - // Note that the true length could deviate from this; the stream could e.g. - // be truncated. - // - // Also note that this leaves "*source" in a state that is unsuitable for - // further operations, such as RawUncompress(). You will need to rewind - // or recreate the source yourself before attempting any further calls. - bool GetUncompressedLength(Source* source, uint32* result); - - // ------------------------------------------------------------------------ - // Higher-level string based routines (should be sufficient for most users) - // ------------------------------------------------------------------------ - - // Sets "*output" to the compressed version of "input[0,input_length-1]". - // Original contents of *output are lost. - // - // REQUIRES: "input[]" is not an alias of "*output". - size_t Compress(const char* input, size_t input_length, string* output); - - // Decompresses "compressed[0,compressed_length-1]" to "*uncompressed". - // Original contents of "*uncompressed" are lost. - // - // REQUIRES: "compressed[]" is not an alias of "*uncompressed". - // - // returns false if the message is corrupted and could not be decompressed - bool Uncompress(const char* compressed, size_t compressed_length, - string* uncompressed); - - - // ------------------------------------------------------------------------ - // Lower-level character array based routines. May be useful for - // efficiency reasons in certain circumstances. - // ------------------------------------------------------------------------ - - // REQUIRES: "compressed" must point to an area of memory that is at - // least "MaxCompressedLength(input_length)" bytes in length. - // - // Takes the data stored in "input[0..input_length]" and stores - // it in the array pointed to by "compressed". - // - // "*compressed_length" is set to the length of the compressed output. - // - // Example: - // char* output = new char[snappy::MaxCompressedLength(input_length)]; - // size_t output_length; - // RawCompress(input, input_length, output, &output_length); - // ... Process(output, output_length) ... - // delete [] output; - void RawCompress(const char* input, - size_t input_length, - char* compressed, - size_t* compressed_length); - - // Given data in "compressed[0..compressed_length-1]" generated by - // calling the Snappy::Compress routine, this routine - // stores the uncompressed data to - // uncompressed[0..GetUncompressedLength(compressed)-1] - // returns false if the message is corrupted and could not be decrypted - bool RawUncompress(const char* compressed, size_t compressed_length, - char* uncompressed); - - // Given data from the byte source 'compressed' generated by calling - // the Snappy::Compress routine, this routine stores the uncompressed - // data to - // uncompressed[0..GetUncompressedLength(compressed,compressed_length)-1] - // returns false if the message is corrupted and could not be decrypted - bool RawUncompress(Source* compressed, char* uncompressed); - - // Given data in "compressed[0..compressed_length-1]" generated by - // calling the Snappy::Compress routine, this routine - // stores the uncompressed data to the iovec "iov". The number of physical - // buffers in "iov" is given by iov_cnt and their cumulative size - // must be at least GetUncompressedLength(compressed). The individual buffers - // in "iov" must not overlap with each other. - // - // returns false if the message is corrupted and could not be decrypted - bool RawUncompressToIOVec(const char* compressed, size_t compressed_length, - const struct iovec* iov, size_t iov_cnt); - - // Given data from the byte source 'compressed' generated by calling - // the Snappy::Compress routine, this routine stores the uncompressed - // data to the iovec "iov". The number of physical - // buffers in "iov" is given by iov_cnt and their cumulative size - // must be at least GetUncompressedLength(compressed). The individual buffers - // in "iov" must not overlap with each other. - // - // returns false if the message is corrupted and could not be decrypted - bool RawUncompressToIOVec(Source* compressed, const struct iovec* iov, - size_t iov_cnt); - - // Returns the maximal size of the compressed representation of - // input data that is "source_bytes" bytes in length; - size_t MaxCompressedLength(size_t source_bytes); - - // REQUIRES: "compressed[]" was produced by RawCompress() or Compress() - // Returns true and stores the length of the uncompressed data in - // *result normally. Returns false on parsing error. - // This operation takes O(1) time. - bool GetUncompressedLength(const char* compressed, size_t compressed_length, - size_t* result); - - // Returns true iff the contents of "compressed[]" can be uncompressed - // successfully. Does not return the uncompressed data. Takes - // time proportional to compressed_length, but is usually at least - // a factor of four faster than actual decompression. - bool IsValidCompressedBuffer(const char* compressed, - size_t compressed_length); - - // The size of a compression block. Note that many parts of the compression - // code assumes that kBlockSize <= 65536; in particular, the hash table - // can only store 16-bit offsets, and EmitCopy() also assumes the offset - // is 65535 bytes or less. Note also that if you change this, it will - // affect the framing format (see framing_format.txt). - // - // Note that there might be older data around that is compressed with larger - // block sizes, so the decompression code should not rely on the - // non-existence of long backreferences. - static const int kBlockLog = 16; - static const size_t kBlockSize = 1 << kBlockLog; - - static const int kMaxHashTableBits = 14; - static const size_t kMaxHashTableSize = 1 << kMaxHashTableBits; -} // end namespace snappy - - -#endif // UTIL_SNAPPY_SNAPPY_H__