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faacf17cc1
called sqlite_stat3 that will hopefully facilitate better query planning decisions. FossilOrigin-Name: 52e1d7e8ddd4bb5ef3a9d00fd2d719a8a784f807
561 lines
18 KiB
C
561 lines
18 KiB
C
/*
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** 2004 April 13
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**
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** The author disclaims copyright to this source code. In place of
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** a legal notice, here is a blessing:
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**
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** May you do good and not evil.
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** May you find forgiveness for yourself and forgive others.
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** May you share freely, never taking more than you give.
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**
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*************************************************************************
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** This file contains routines used to translate between UTF-8,
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** UTF-16, UTF-16BE, and UTF-16LE.
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**
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** Notes on UTF-8:
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**
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** Byte-0 Byte-1 Byte-2 Byte-3 Value
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** 0xxxxxxx 00000000 00000000 0xxxxxxx
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** 110yyyyy 10xxxxxx 00000000 00000yyy yyxxxxxx
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** 1110zzzz 10yyyyyy 10xxxxxx 00000000 zzzzyyyy yyxxxxxx
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** 11110uuu 10uuzzzz 10yyyyyy 10xxxxxx 000uuuuu zzzzyyyy yyxxxxxx
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**
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**
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** Notes on UTF-16: (with wwww+1==uuuuu)
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**
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** Word-0 Word-1 Value
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** 110110ww wwzzzzyy 110111yy yyxxxxxx 000uuuuu zzzzyyyy yyxxxxxx
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** zzzzyyyy yyxxxxxx 00000000 zzzzyyyy yyxxxxxx
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**
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**
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** BOM or Byte Order Mark:
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** 0xff 0xfe little-endian utf-16 follows
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** 0xfe 0xff big-endian utf-16 follows
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**
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*/
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#include "sqliteInt.h"
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#include <assert.h>
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#include "vdbeInt.h"
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#ifndef SQLITE_AMALGAMATION
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/*
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** The following constant value is used by the SQLITE_BIGENDIAN and
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** SQLITE_LITTLEENDIAN macros.
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*/
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const int sqlite3one = 1;
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#endif /* SQLITE_AMALGAMATION */
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/*
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** This lookup table is used to help decode the first byte of
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** a multi-byte UTF8 character.
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*/
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static const unsigned char sqlite3Utf8Trans1[] = {
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0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
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0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
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0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
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0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
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0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
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0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
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0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
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0x00, 0x01, 0x02, 0x03, 0x00, 0x01, 0x00, 0x00,
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};
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#define WRITE_UTF8(zOut, c) { \
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if( c<0x00080 ){ \
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*zOut++ = (u8)(c&0xFF); \
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} \
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else if( c<0x00800 ){ \
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*zOut++ = 0xC0 + (u8)((c>>6)&0x1F); \
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*zOut++ = 0x80 + (u8)(c & 0x3F); \
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} \
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else if( c<0x10000 ){ \
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*zOut++ = 0xE0 + (u8)((c>>12)&0x0F); \
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*zOut++ = 0x80 + (u8)((c>>6) & 0x3F); \
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*zOut++ = 0x80 + (u8)(c & 0x3F); \
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}else{ \
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*zOut++ = 0xF0 + (u8)((c>>18) & 0x07); \
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*zOut++ = 0x80 + (u8)((c>>12) & 0x3F); \
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*zOut++ = 0x80 + (u8)((c>>6) & 0x3F); \
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*zOut++ = 0x80 + (u8)(c & 0x3F); \
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} \
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}
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#define WRITE_UTF16LE(zOut, c) { \
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if( c<=0xFFFF ){ \
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*zOut++ = (u8)(c&0x00FF); \
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*zOut++ = (u8)((c>>8)&0x00FF); \
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}else{ \
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*zOut++ = (u8)(((c>>10)&0x003F) + (((c-0x10000)>>10)&0x00C0)); \
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*zOut++ = (u8)(0x00D8 + (((c-0x10000)>>18)&0x03)); \
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*zOut++ = (u8)(c&0x00FF); \
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*zOut++ = (u8)(0x00DC + ((c>>8)&0x03)); \
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} \
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}
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#define WRITE_UTF16BE(zOut, c) { \
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if( c<=0xFFFF ){ \
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*zOut++ = (u8)((c>>8)&0x00FF); \
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*zOut++ = (u8)(c&0x00FF); \
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}else{ \
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*zOut++ = (u8)(0x00D8 + (((c-0x10000)>>18)&0x03)); \
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*zOut++ = (u8)(((c>>10)&0x003F) + (((c-0x10000)>>10)&0x00C0)); \
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*zOut++ = (u8)(0x00DC + ((c>>8)&0x03)); \
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*zOut++ = (u8)(c&0x00FF); \
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} \
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}
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#define READ_UTF16LE(zIn, TERM, c){ \
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c = (*zIn++); \
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c += ((*zIn++)<<8); \
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if( c>=0xD800 && c<0xE000 && TERM ){ \
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int c2 = (*zIn++); \
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c2 += ((*zIn++)<<8); \
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c = (c2&0x03FF) + ((c&0x003F)<<10) + (((c&0x03C0)+0x0040)<<10); \
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} \
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}
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#define READ_UTF16BE(zIn, TERM, c){ \
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c = ((*zIn++)<<8); \
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c += (*zIn++); \
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if( c>=0xD800 && c<0xE000 && TERM ){ \
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int c2 = ((*zIn++)<<8); \
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c2 += (*zIn++); \
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c = (c2&0x03FF) + ((c&0x003F)<<10) + (((c&0x03C0)+0x0040)<<10); \
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} \
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}
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/*
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** Translate a single UTF-8 character. Return the unicode value.
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**
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** During translation, assume that the byte that zTerm points
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** is a 0x00.
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**
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** Write a pointer to the next unread byte back into *pzNext.
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**
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** Notes On Invalid UTF-8:
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**
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** * This routine never allows a 7-bit character (0x00 through 0x7f) to
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** be encoded as a multi-byte character. Any multi-byte character that
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** attempts to encode a value between 0x00 and 0x7f is rendered as 0xfffd.
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**
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** * This routine never allows a UTF16 surrogate value to be encoded.
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** If a multi-byte character attempts to encode a value between
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** 0xd800 and 0xe000 then it is rendered as 0xfffd.
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**
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** * Bytes in the range of 0x80 through 0xbf which occur as the first
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** byte of a character are interpreted as single-byte characters
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** and rendered as themselves even though they are technically
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** invalid characters.
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**
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** * This routine accepts an infinite number of different UTF8 encodings
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** for unicode values 0x80 and greater. It do not change over-length
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** encodings to 0xfffd as some systems recommend.
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*/
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#define READ_UTF8(zIn, zTerm, c) \
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c = *(zIn++); \
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if( c>=0xc0 ){ \
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c = sqlite3Utf8Trans1[c-0xc0]; \
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while( zIn!=zTerm && (*zIn & 0xc0)==0x80 ){ \
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c = (c<<6) + (0x3f & *(zIn++)); \
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} \
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if( c<0x80 \
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|| (c&0xFFFFF800)==0xD800 \
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|| (c&0xFFFFFFFE)==0xFFFE ){ c = 0xFFFD; } \
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}
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u32 sqlite3Utf8Read(
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const unsigned char *zIn, /* First byte of UTF-8 character */
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const unsigned char **pzNext /* Write first byte past UTF-8 char here */
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){
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unsigned int c;
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/* Same as READ_UTF8() above but without the zTerm parameter.
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** For this routine, we assume the UTF8 string is always zero-terminated.
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*/
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c = *(zIn++);
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if( c>=0xc0 ){
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c = sqlite3Utf8Trans1[c-0xc0];
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while( (*zIn & 0xc0)==0x80 ){
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c = (c<<6) + (0x3f & *(zIn++));
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}
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if( c<0x80
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|| (c&0xFFFFF800)==0xD800
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|| (c&0xFFFFFFFE)==0xFFFE ){ c = 0xFFFD; }
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}
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*pzNext = zIn;
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return c;
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}
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/*
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** If the TRANSLATE_TRACE macro is defined, the value of each Mem is
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** printed on stderr on the way into and out of sqlite3VdbeMemTranslate().
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*/
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/* #define TRANSLATE_TRACE 1 */
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#ifndef SQLITE_OMIT_UTF16
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/*
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** This routine transforms the internal text encoding used by pMem to
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** desiredEnc. It is an error if the string is already of the desired
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** encoding, or if *pMem does not contain a string value.
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*/
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int sqlite3VdbeMemTranslate(Mem *pMem, u8 desiredEnc){
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int len; /* Maximum length of output string in bytes */
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unsigned char *zOut; /* Output buffer */
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unsigned char *zIn; /* Input iterator */
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unsigned char *zTerm; /* End of input */
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unsigned char *z; /* Output iterator */
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unsigned int c;
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assert( pMem->db==0 || sqlite3_mutex_held(pMem->db->mutex) );
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assert( pMem->flags&MEM_Str );
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assert( pMem->enc!=desiredEnc );
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assert( pMem->enc!=0 );
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assert( pMem->n>=0 );
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#if defined(TRANSLATE_TRACE) && defined(SQLITE_DEBUG)
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{
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char zBuf[100];
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sqlite3VdbeMemPrettyPrint(pMem, zBuf);
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fprintf(stderr, "INPUT: %s\n", zBuf);
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}
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#endif
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/* If the translation is between UTF-16 little and big endian, then
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** all that is required is to swap the byte order. This case is handled
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** differently from the others.
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*/
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if( pMem->enc!=SQLITE_UTF8 && desiredEnc!=SQLITE_UTF8 ){
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u8 temp;
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int rc;
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rc = sqlite3VdbeMemMakeWriteable(pMem);
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if( rc!=SQLITE_OK ){
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assert( rc==SQLITE_NOMEM );
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return SQLITE_NOMEM;
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}
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zIn = (u8*)pMem->z;
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zTerm = &zIn[pMem->n&~1];
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while( zIn<zTerm ){
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temp = *zIn;
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*zIn = *(zIn+1);
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zIn++;
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*zIn++ = temp;
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}
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pMem->enc = desiredEnc;
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goto translate_out;
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}
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/* Set len to the maximum number of bytes required in the output buffer. */
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if( desiredEnc==SQLITE_UTF8 ){
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/* When converting from UTF-16, the maximum growth results from
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** translating a 2-byte character to a 4-byte UTF-8 character.
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** A single byte is required for the output string
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** nul-terminator.
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*/
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pMem->n &= ~1;
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len = pMem->n * 2 + 1;
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}else{
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/* When converting from UTF-8 to UTF-16 the maximum growth is caused
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** when a 1-byte UTF-8 character is translated into a 2-byte UTF-16
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** character. Two bytes are required in the output buffer for the
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** nul-terminator.
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*/
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len = pMem->n * 2 + 2;
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}
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/* Set zIn to point at the start of the input buffer and zTerm to point 1
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** byte past the end.
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**
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** Variable zOut is set to point at the output buffer, space obtained
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** from sqlite3_malloc().
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*/
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zIn = (u8*)pMem->z;
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zTerm = &zIn[pMem->n];
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zOut = sqlite3DbMallocRaw(pMem->db, len);
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if( !zOut ){
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return SQLITE_NOMEM;
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}
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z = zOut;
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if( pMem->enc==SQLITE_UTF8 ){
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if( desiredEnc==SQLITE_UTF16LE ){
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/* UTF-8 -> UTF-16 Little-endian */
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while( zIn<zTerm ){
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/* c = sqlite3Utf8Read(zIn, zTerm, (const u8**)&zIn); */
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READ_UTF8(zIn, zTerm, c);
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WRITE_UTF16LE(z, c);
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}
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}else{
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assert( desiredEnc==SQLITE_UTF16BE );
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/* UTF-8 -> UTF-16 Big-endian */
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while( zIn<zTerm ){
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/* c = sqlite3Utf8Read(zIn, zTerm, (const u8**)&zIn); */
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READ_UTF8(zIn, zTerm, c);
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WRITE_UTF16BE(z, c);
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}
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}
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pMem->n = (int)(z - zOut);
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*z++ = 0;
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}else{
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assert( desiredEnc==SQLITE_UTF8 );
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if( pMem->enc==SQLITE_UTF16LE ){
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/* UTF-16 Little-endian -> UTF-8 */
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while( zIn<zTerm ){
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READ_UTF16LE(zIn, zIn<zTerm, c);
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WRITE_UTF8(z, c);
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}
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}else{
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/* UTF-16 Big-endian -> UTF-8 */
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while( zIn<zTerm ){
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READ_UTF16BE(zIn, zIn<zTerm, c);
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WRITE_UTF8(z, c);
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}
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}
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pMem->n = (int)(z - zOut);
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}
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*z = 0;
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assert( (pMem->n+(desiredEnc==SQLITE_UTF8?1:2))<=len );
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sqlite3VdbeMemRelease(pMem);
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pMem->flags &= ~(MEM_Static|MEM_Dyn|MEM_Ephem);
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pMem->enc = desiredEnc;
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pMem->flags |= (MEM_Term|MEM_Dyn);
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pMem->z = (char*)zOut;
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pMem->zMalloc = pMem->z;
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translate_out:
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#if defined(TRANSLATE_TRACE) && defined(SQLITE_DEBUG)
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{
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char zBuf[100];
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sqlite3VdbeMemPrettyPrint(pMem, zBuf);
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fprintf(stderr, "OUTPUT: %s\n", zBuf);
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}
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#endif
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return SQLITE_OK;
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}
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/*
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** This routine checks for a byte-order mark at the beginning of the
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** UTF-16 string stored in *pMem. If one is present, it is removed and
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** the encoding of the Mem adjusted. This routine does not do any
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** byte-swapping, it just sets Mem.enc appropriately.
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**
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** The allocation (static, dynamic etc.) and encoding of the Mem may be
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** changed by this function.
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*/
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int sqlite3VdbeMemHandleBom(Mem *pMem){
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int rc = SQLITE_OK;
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u8 bom = 0;
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assert( pMem->n>=0 );
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if( pMem->n>1 ){
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u8 b1 = *(u8 *)pMem->z;
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u8 b2 = *(((u8 *)pMem->z) + 1);
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if( b1==0xFE && b2==0xFF ){
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bom = SQLITE_UTF16BE;
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}
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if( b1==0xFF && b2==0xFE ){
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bom = SQLITE_UTF16LE;
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}
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}
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if( bom ){
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rc = sqlite3VdbeMemMakeWriteable(pMem);
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if( rc==SQLITE_OK ){
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pMem->n -= 2;
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memmove(pMem->z, &pMem->z[2], pMem->n);
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pMem->z[pMem->n] = '\0';
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pMem->z[pMem->n+1] = '\0';
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pMem->flags |= MEM_Term;
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pMem->enc = bom;
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}
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}
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return rc;
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}
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#endif /* SQLITE_OMIT_UTF16 */
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/*
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** pZ is a UTF-8 encoded unicode string. If nByte is less than zero,
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** return the number of unicode characters in pZ up to (but not including)
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** the first 0x00 byte. If nByte is not less than zero, return the
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** number of unicode characters in the first nByte of pZ (or up to
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** the first 0x00, whichever comes first).
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*/
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int sqlite3Utf8CharLen(const char *zIn, int nByte){
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int r = 0;
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const u8 *z = (const u8*)zIn;
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const u8 *zTerm;
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if( nByte>=0 ){
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zTerm = &z[nByte];
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}else{
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zTerm = (const u8*)(-1);
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}
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assert( z<=zTerm );
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while( *z!=0 && z<zTerm ){
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SQLITE_SKIP_UTF8(z);
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r++;
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}
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return r;
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}
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/* This test function is not currently used by the automated test-suite.
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** Hence it is only available in debug builds.
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*/
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#if defined(SQLITE_TEST) && defined(SQLITE_DEBUG)
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/*
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** Translate UTF-8 to UTF-8.
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**
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** This has the effect of making sure that the string is well-formed
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** UTF-8. Miscoded characters are removed.
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**
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** The translation is done in-place and aborted if the output
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** overruns the input.
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*/
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int sqlite3Utf8To8(unsigned char *zIn){
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unsigned char *zOut = zIn;
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unsigned char *zStart = zIn;
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u32 c;
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while( zIn[0] && zOut<=zIn ){
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c = sqlite3Utf8Read(zIn, (const u8**)&zIn);
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if( c!=0xfffd ){
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WRITE_UTF8(zOut, c);
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}
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}
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*zOut = 0;
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return (int)(zOut - zStart);
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}
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#endif
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#ifndef SQLITE_OMIT_UTF16
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/*
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** Convert a UTF-16 string in the native encoding into a UTF-8 string.
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** Memory to hold the UTF-8 string is obtained from sqlite3_malloc and must
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** be freed by the calling function.
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**
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** NULL is returned if there is an allocation error.
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*/
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char *sqlite3Utf16to8(sqlite3 *db, const void *z, int nByte, u8 enc){
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Mem m;
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memset(&m, 0, sizeof(m));
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m.db = db;
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sqlite3VdbeMemSetStr(&m, z, nByte, enc, SQLITE_STATIC);
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sqlite3VdbeChangeEncoding(&m, SQLITE_UTF8);
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if( db->mallocFailed ){
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sqlite3VdbeMemRelease(&m);
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m.z = 0;
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}
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assert( (m.flags & MEM_Term)!=0 || db->mallocFailed );
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assert( (m.flags & MEM_Str)!=0 || db->mallocFailed );
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assert( (m.flags & MEM_Dyn)!=0 || db->mallocFailed );
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assert( m.z || db->mallocFailed );
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|
return m.z;
|
|
}
|
|
|
|
/*
|
|
** Convert a UTF-8 string to the UTF-16 encoding specified by parameter
|
|
** enc. A pointer to the new string is returned, and the value of *pnOut
|
|
** is set to the length of the returned string in bytes. The call should
|
|
** arrange to call sqlite3DbFree() on the returned pointer when it is
|
|
** no longer required.
|
|
**
|
|
** If a malloc failure occurs, NULL is returned and the db.mallocFailed
|
|
** flag set.
|
|
*/
|
|
#ifdef SQLITE_ENABLE_STAT3
|
|
char *sqlite3Utf8to16(sqlite3 *db, u8 enc, char *z, int n, int *pnOut){
|
|
Mem m;
|
|
memset(&m, 0, sizeof(m));
|
|
m.db = db;
|
|
sqlite3VdbeMemSetStr(&m, z, n, SQLITE_UTF8, SQLITE_STATIC);
|
|
if( sqlite3VdbeMemTranslate(&m, enc) ){
|
|
assert( db->mallocFailed );
|
|
return 0;
|
|
}
|
|
assert( m.z==m.zMalloc );
|
|
*pnOut = m.n;
|
|
return m.z;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
** zIn is a UTF-16 encoded unicode string at least nChar characters long.
|
|
** Return the number of bytes in the first nChar unicode characters
|
|
** in pZ. nChar must be non-negative.
|
|
*/
|
|
int sqlite3Utf16ByteLen(const void *zIn, int nChar){
|
|
int c;
|
|
unsigned char const *z = zIn;
|
|
int n = 0;
|
|
|
|
if( SQLITE_UTF16NATIVE==SQLITE_UTF16BE ){
|
|
while( n<nChar ){
|
|
READ_UTF16BE(z, 1, c);
|
|
n++;
|
|
}
|
|
}else{
|
|
while( n<nChar ){
|
|
READ_UTF16LE(z, 1, c);
|
|
n++;
|
|
}
|
|
}
|
|
return (int)(z-(unsigned char const *)zIn);
|
|
}
|
|
|
|
#if defined(SQLITE_TEST)
|
|
/*
|
|
** This routine is called from the TCL test function "translate_selftest".
|
|
** It checks that the primitives for serializing and deserializing
|
|
** characters in each encoding are inverses of each other.
|
|
*/
|
|
void sqlite3UtfSelfTest(void){
|
|
unsigned int i, t;
|
|
unsigned char zBuf[20];
|
|
unsigned char *z;
|
|
int n;
|
|
unsigned int c;
|
|
|
|
for(i=0; i<0x00110000; i++){
|
|
z = zBuf;
|
|
WRITE_UTF8(z, i);
|
|
n = (int)(z-zBuf);
|
|
assert( n>0 && n<=4 );
|
|
z[0] = 0;
|
|
z = zBuf;
|
|
c = sqlite3Utf8Read(z, (const u8**)&z);
|
|
t = i;
|
|
if( i>=0xD800 && i<=0xDFFF ) t = 0xFFFD;
|
|
if( (i&0xFFFFFFFE)==0xFFFE ) t = 0xFFFD;
|
|
assert( c==t );
|
|
assert( (z-zBuf)==n );
|
|
}
|
|
for(i=0; i<0x00110000; i++){
|
|
if( i>=0xD800 && i<0xE000 ) continue;
|
|
z = zBuf;
|
|
WRITE_UTF16LE(z, i);
|
|
n = (int)(z-zBuf);
|
|
assert( n>0 && n<=4 );
|
|
z[0] = 0;
|
|
z = zBuf;
|
|
READ_UTF16LE(z, 1, c);
|
|
assert( c==i );
|
|
assert( (z-zBuf)==n );
|
|
}
|
|
for(i=0; i<0x00110000; i++){
|
|
if( i>=0xD800 && i<0xE000 ) continue;
|
|
z = zBuf;
|
|
WRITE_UTF16BE(z, i);
|
|
n = (int)(z-zBuf);
|
|
assert( n>0 && n<=4 );
|
|
z[0] = 0;
|
|
z = zBuf;
|
|
READ_UTF16BE(z, 1, c);
|
|
assert( c==i );
|
|
assert( (z-zBuf)==n );
|
|
}
|
|
}
|
|
#endif /* SQLITE_TEST */
|
|
#endif /* SQLITE_OMIT_UTF16 */
|