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571 lines
19 KiB
571 lines
19 KiB
/*
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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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** $Id: utf.c 548347 2006-06-05 10:53:00Z staniek $
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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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** Handling of malformed strings:
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**
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** SQLite accepts and processes malformed strings without an error wherever
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** possible. However this is not possible when converting between UTF-8 and
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** UTF-16.
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**
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** When converting malformed UTF-8 strings to UTF-16, one instance of the
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** replacement character U+FFFD for each byte that cannot be interpeted as
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** part of a valid unicode character.
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**
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** When converting malformed UTF-16 strings to UTF-8, one instance of the
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** replacement character U+FFFD for each pair of bytes that cannot be
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** interpeted as part of a valid unicode character.
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**
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** This file contains the following public routines:
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**
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** sqlite3VdbeMemTranslate() - Translate the encoding used by a Mem* string.
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** sqlite3VdbeMemHandleBom() - Handle byte-order-marks in UTF16 Mem* strings.
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** sqlite3utf16ByteLen() - Calculate byte-length of a void* UTF16 string.
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** sqlite3utf8CharLen() - Calculate char-length of a char* UTF8 string.
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** sqlite3utf8LikeCompare() - Do a LIKE match given two UTF8 char* strings.
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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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/*
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** This table maps from the first byte of a UTF-8 character to the number
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** of trailing bytes expected. A value '255' indicates that the table key
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** is not a legal first byte for a UTF-8 character.
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*/
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static const u8 xtra_utf8_bytes[256] = {
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/* 0xxxxxxx */
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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/* 10wwwwww */
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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/* 110yyyyy */
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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/* 1110zzzz */
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2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
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/* 11110yyy */
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3, 3, 3, 3, 3, 3, 3, 3, 255, 255, 255, 255, 255, 255, 255, 255,
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};
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/*
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** This table maps from the number of trailing bytes in a UTF-8 character
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** to an integer constant that is effectively calculated for each character
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** read by a naive implementation of a UTF-8 character reader. The code
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** in the READ_UTF8 macro explains things best.
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*/
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static const int xtra_utf8_bits[4] = {
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0,
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12416, /* (0xC0 << 6) + (0x80) */
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925824, /* (0xE0 << 12) + (0x80 << 6) + (0x80) */
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63447168 /* (0xF0 << 18) + (0x80 << 12) + (0x80 << 6) + 0x80 */
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};
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#define READ_UTF8(zIn, c) { \
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int xtra; \
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c = *(zIn)++; \
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xtra = xtra_utf8_bytes[c]; \
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switch( xtra ){ \
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case 255: c = (int)0xFFFD; break; \
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case 3: c = (c<<6) + *(zIn)++; \
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case 2: c = (c<<6) + *(zIn)++; \
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case 1: c = (c<<6) + *(zIn)++; \
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c -= xtra_utf8_bits[xtra]; \
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} \
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}
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int sqlite3ReadUtf8(const unsigned char *z){
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int c;
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READ_UTF8(z, c);
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return c;
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}
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#define SKIP_UTF8(zIn) { \
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zIn += (xtra_utf8_bytes[*(u8 *)zIn] + 1); \
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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++ = (c&0xFF); \
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} \
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else if( c<0x00800 ){ \
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*zOut++ = 0xC0 + ((c>>6)&0x1F); \
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*zOut++ = 0x80 + (c & 0x3F); \
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} \
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else if( c<0x10000 ){ \
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*zOut++ = 0xE0 + ((c>>12)&0x0F); \
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*zOut++ = 0x80 + ((c>>6) & 0x3F); \
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*zOut++ = 0x80 + (c & 0x3F); \
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}else{ \
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*zOut++ = 0xF0 + ((c>>18) & 0x07); \
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*zOut++ = 0x80 + ((c>>12) & 0x3F); \
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*zOut++ = 0x80 + ((c>>6) & 0x3F); \
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*zOut++ = 0x80 + (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++ = (c&0x00FF); \
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*zOut++ = ((c>>8)&0x00FF); \
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}else{ \
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*zOut++ = (((c>>10)&0x003F) + (((c-0x10000)>>10)&0x00C0)); \
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*zOut++ = (0x00D8 + (((c-0x10000)>>18)&0x03)); \
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*zOut++ = (c&0x00FF); \
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*zOut++ = (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++ = ((c>>8)&0x00FF); \
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*zOut++ = (c&0x00FF); \
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}else{ \
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*zOut++ = (0x00D8 + (((c-0x10000)>>18)&0x03)); \
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*zOut++ = (((c>>10)&0x003F) + (((c-0x10000)>>10)&0x00C0)); \
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*zOut++ = (0x00DC + ((c>>8)&0x03)); \
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*zOut++ = (c&0x00FF); \
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} \
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}
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#define READ_UTF16LE(zIn, c){ \
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c = (*zIn++); \
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c += ((*zIn++)<<8); \
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if( c>=0xD800 && c<=0xE000 ){ \
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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, c){ \
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c = ((*zIn++)<<8); \
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c += (*zIn++); \
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if( c>=0xD800 && c<=0xE000 ){ \
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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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#define SKIP_UTF16BE(zIn){ \
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if( *zIn>=0xD8 && (*zIn<0xE0 || (*zIn==0xE0 && *(zIn+1)==0x00)) ){ \
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zIn += 4; \
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}else{ \
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zIn += 2; \
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} \
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}
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#define SKIP_UTF16LE(zIn){ \
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zIn++; \
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if( *zIn>=0xD8 && (*zIn<0xE0 || (*zIn==0xE0 && *(zIn-1)==0x00)) ){ \
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zIn += 3; \
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}else{ \
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zIn += 1; \
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} \
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}
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#define RSKIP_UTF16LE(zIn){ \
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if( *zIn>=0xD8 && (*zIn<0xE0 || (*zIn==0xE0 && *(zIn-1)==0x00)) ){ \
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zIn -= 4; \
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}else{ \
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zIn -= 2; \
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} \
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}
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#define RSKIP_UTF16BE(zIn){ \
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zIn--; \
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if( *zIn>=0xD8 && (*zIn<0xE0 || (*zIn==0xE0 && *(zIn+1)==0x00)) ){ \
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zIn -= 3; \
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}else{ \
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zIn -= 1; \
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} \
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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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unsigned char zShort[NBFS]; /* Temporary short output buffer */
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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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int c;
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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, 100);
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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 = pMem->z;
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zTerm = &zIn[pMem->n];
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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 3-byte UTF-8 character (i.e.
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** code-point 0xFFFC). A single byte is required for the output string
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** nul-terminator.
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*/
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len = (pMem->n/2) * 3 + 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. This may be space
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** obtained from malloc(), or Mem.zShort, if it large enough and not in
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** use, or the zShort array on the stack (see above).
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*/
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zIn = pMem->z;
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zTerm = &zIn[pMem->n];
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if( len>NBFS ){
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zOut = sqliteMallocRaw(len);
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if( !zOut ) return SQLITE_NOMEM;
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}else{
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zOut = zShort;
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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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READ_UTF8(zIn, 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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READ_UTF8(zIn, c);
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WRITE_UTF16BE(z, c);
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}
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}
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pMem->n = 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, c);
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WRITE_UTF8(z, c);
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}
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}else{
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/* UTF-16 Little-endian -> UTF-8 */
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while( zIn<zTerm ){
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READ_UTF16BE(zIn, c);
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WRITE_UTF8(z, c);
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}
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}
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pMem->n = 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|MEM_Short);
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pMem->enc = desiredEnc;
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if( zOut==zShort ){
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memcpy(pMem->zShort, zOut, len);
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zOut = pMem->zShort;
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pMem->flags |= (MEM_Term|MEM_Short);
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}else{
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pMem->flags |= (MEM_Term|MEM_Dyn);
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}
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pMem->z = zOut;
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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, 100);
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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
|
|
** the encoding of the Mem adjusted. This routine does not do any
|
|
** byte-swapping, it just sets Mem.enc appropriately.
|
|
**
|
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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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int sqlite3VdbeMemHandleBom(Mem *pMem){
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|
int rc = SQLITE_OK;
|
|
u8 bom = 0;
|
|
|
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if( pMem->n<0 || pMem->n>1 ){
|
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u8 b1 = *(u8 *)pMem->z;
|
|
u8 b2 = *(((u8 *)pMem->z) + 1);
|
|
if( b1==0xFE && b2==0xFF ){
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bom = SQLITE_UTF16BE;
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}
|
|
if( b1==0xFF && b2==0xFE ){
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bom = SQLITE_UTF16LE;
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|
}
|
|
}
|
|
|
|
if( bom ){
|
|
/* This function is called as soon as a string is stored in a Mem*,
|
|
** from within sqlite3VdbeMemSetStr(). At that point it is not possible
|
|
** for the string to be stored in Mem.zShort, or for it to be stored
|
|
** in dynamic memory with no destructor.
|
|
*/
|
|
assert( !(pMem->flags&MEM_Short) );
|
|
assert( !(pMem->flags&MEM_Dyn) || pMem->xDel );
|
|
if( pMem->flags & MEM_Dyn ){
|
|
void (*xDel)(void*) = pMem->xDel;
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char *z = pMem->z;
|
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pMem->z = 0;
|
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pMem->xDel = 0;
|
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rc = sqlite3VdbeMemSetStr(pMem, &z[2], pMem->n-2, bom, SQLITE_TRANSIENT);
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xDel(z);
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}else{
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rc = sqlite3VdbeMemSetStr(pMem, &pMem->z[2], pMem->n-2, bom,
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SQLITE_TRANSIENT);
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}
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}
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return rc;
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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,
|
|
** return the number of unicode characters in pZ up to (but not including)
|
|
** the first 0x00 byte. If nByte is not less than zero, return the
|
|
** 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 *z, int nByte){
|
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int r = 0;
|
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const char *zTerm;
|
|
if( nByte>=0 ){
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zTerm = &z[nByte];
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|
}else{
|
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zTerm = (const char *)(-1);
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|
}
|
|
assert( z<=zTerm );
|
|
while( *z!=0 && z<zTerm ){
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SKIP_UTF8(z);
|
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r++;
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}
|
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return r;
|
|
}
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#ifndef SQLITE_OMIT_UTF16
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/*
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** pZ is a UTF-16 encoded unicode string. If nChar is less than zero,
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** return the number of bytes up to (but not including), the first pair
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** of consecutive 0x00 bytes in pZ. If nChar is not less than zero,
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** then return the number of bytes in the first nChar unicode characters
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** in pZ (or up until the first pair of 0x00 bytes, whichever comes first).
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*/
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int sqlite3utf16ByteLen(const void *zIn, int nChar){
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int c = 1;
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char const *z = zIn;
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int n = 0;
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if( SQLITE_UTF16NATIVE==SQLITE_UTF16BE ){
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while( c && ((nChar<0) || n<nChar) ){
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READ_UTF16BE(z, c);
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n++;
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}
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}else{
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while( c && ((nChar<0) || n<nChar) ){
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READ_UTF16LE(z, c);
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n++;
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}
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}
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return (z-(char const *)zIn)-((c==0)?2:0);
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}
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/*
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** UTF-16 implementation of the substr()
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*/
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void sqlite3utf16Substr(
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sqlite3_context *context,
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int argc,
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sqlite3_value **argv
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){
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int y, z;
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unsigned char const *zStr;
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unsigned char const *zStrEnd;
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unsigned char const *zStart;
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unsigned char const *zEnd;
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int i;
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zStr = (unsigned char const *)sqlite3_value_text16(argv[0]);
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zStrEnd = &zStr[sqlite3_value_bytes16(argv[0])];
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y = sqlite3_value_int(argv[1]);
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z = sqlite3_value_int(argv[2]);
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if( y>0 ){
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y = y-1;
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zStart = zStr;
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if( SQLITE_UTF16BE==SQLITE_UTF16NATIVE ){
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for(i=0; i<y && zStart<zStrEnd; i++) SKIP_UTF16BE(zStart);
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}else{
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for(i=0; i<y && zStart<zStrEnd; i++) SKIP_UTF16LE(zStart);
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}
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}else{
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zStart = zStrEnd;
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if( SQLITE_UTF16BE==SQLITE_UTF16NATIVE ){
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for(i=y; i<0 && zStart>zStr; i++) RSKIP_UTF16BE(zStart);
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}else{
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for(i=y; i<0 && zStart>zStr; i++) RSKIP_UTF16LE(zStart);
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}
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for(; i<0; i++) z -= 1;
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}
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zEnd = zStart;
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if( SQLITE_UTF16BE==SQLITE_UTF16NATIVE ){
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for(i=0; i<z && zEnd<zStrEnd; i++) SKIP_UTF16BE(zEnd);
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}else{
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for(i=0; i<z && zEnd<zStrEnd; i++) SKIP_UTF16LE(zEnd);
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}
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sqlite3_result_text16(context, zStart, zEnd-zStart, SQLITE_TRANSIENT);
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}
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#if defined(SQLITE_TEST)
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/*
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** This routine is called from the TCL test function "translate_selftest".
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** It checks that the primitives for serializing and deserializing
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** characters in each encoding are inverses of each other.
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*/
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void sqlite3utfSelfTest(){
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int i;
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unsigned char zBuf[20];
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unsigned char *z;
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int n;
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int c;
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for(i=0; i<0x00110000; i++){
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z = zBuf;
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WRITE_UTF8(z, i);
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n = z-zBuf;
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z = zBuf;
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READ_UTF8(z, c);
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assert( c==i );
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assert( (z-zBuf)==n );
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}
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for(i=0; i<0x00110000; i++){
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if( i>=0xD800 && i<=0xE000 ) continue;
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z = zBuf;
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WRITE_UTF16LE(z, i);
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n = z-zBuf;
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z = zBuf;
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READ_UTF16LE(z, c);
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assert( c==i );
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assert( (z-zBuf)==n );
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}
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for(i=0; i<0x00110000; i++){
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if( i>=0xD800 && i<=0xE000 ) continue;
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z = zBuf;
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WRITE_UTF16BE(z, i);
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n = z-zBuf;
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z = zBuf;
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READ_UTF16BE(z, c);
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assert( c==i );
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assert( (z-zBuf)==n );
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}
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}
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#endif /* SQLITE_TEST */
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#endif /* SQLITE_OMIT_UTF16 */
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