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338 lines
10 KiB
C
338 lines
10 KiB
C
/*
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* UTF-8 support routines
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*
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* Copyright 2000 Alexandre Julliard
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include <string.h>
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#include "wine/unicode.h"
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extern WCHAR wine_compose( const WCHAR *str );
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/* number of following bytes in sequence based on first byte value (for bytes above 0x7f) */
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static const char utf8_length[128] =
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{
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0x80-0x8f */
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0x90-0x9f */
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0xa0-0xaf */
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0xb0-0xbf */
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0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* 0xc0-0xcf */
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1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* 0xd0-0xdf */
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2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, /* 0xe0-0xef */
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3,3,3,3,3,0,0,0,0,0,0,0,0,0,0,0 /* 0xf0-0xff */
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};
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/* first byte mask depending on UTF-8 sequence length */
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static const unsigned char utf8_mask[4] = { 0x7f, 0x1f, 0x0f, 0x07 };
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/* minimum Unicode value depending on UTF-8 sequence length */
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static const unsigned int utf8_minval[4] = { 0x0, 0x80, 0x800, 0x10000 };
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/* get the next char value taking surrogates into account */
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static inline unsigned int get_surrogate_value( const WCHAR *src, unsigned int srclen )
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{
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if (src[0] >= 0xd800 && src[0] <= 0xdfff) /* surrogate pair */
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{
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if (src[0] > 0xdbff || /* invalid high surrogate */
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srclen <= 1 || /* missing low surrogate */
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src[1] < 0xdc00 || src[1] > 0xdfff) /* invalid low surrogate */
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return 0;
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return 0x10000 + ((src[0] & 0x3ff) << 10) + (src[1] & 0x3ff);
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}
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return src[0];
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}
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/* query necessary dst length for src string */
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static inline int get_length_wcs_utf8( int flags, const WCHAR *src, unsigned int srclen )
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{
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int len;
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unsigned int val;
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for (len = 0; srclen; srclen--, src++)
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{
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if (*src < 0x80) /* 0x00-0x7f: 1 byte */
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{
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len++;
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continue;
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}
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if (*src < 0x800) /* 0x80-0x7ff: 2 bytes */
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{
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len += 2;
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continue;
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}
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if (!(val = get_surrogate_value( src, srclen )))
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{
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if (flags & WC_ERR_INVALID_CHARS) return -2;
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continue;
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}
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if (val < 0x10000) /* 0x800-0xffff: 3 bytes */
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len += 3;
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else /* 0x10000-0x10ffff: 4 bytes */
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{
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len += 4;
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src++;
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srclen--;
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}
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}
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return len;
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}
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/* wide char to UTF-8 string conversion */
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/* return -1 on dst buffer overflow, -2 on invalid input char */
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int wine_utf8_wcstombs( int flags, const WCHAR *src, int srclen, char *dst, int dstlen )
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{
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int len;
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if (!dstlen) return get_length_wcs_utf8( flags, src, srclen );
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for (len = dstlen; srclen; srclen--, src++)
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{
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WCHAR ch = *src;
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unsigned int val;
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if (ch < 0x80) /* 0x00-0x7f: 1 byte */
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{
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if (!len--) return -1; /* overflow */
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*dst++ = ch;
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continue;
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}
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if (ch < 0x800) /* 0x80-0x7ff: 2 bytes */
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{
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if ((len -= 2) < 0) return -1; /* overflow */
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dst[1] = 0x80 | (ch & 0x3f);
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ch >>= 6;
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dst[0] = 0xc0 | ch;
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dst += 2;
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continue;
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}
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if (!(val = get_surrogate_value( src, srclen )))
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{
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if (flags & WC_ERR_INVALID_CHARS) return -2;
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continue;
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}
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if (val < 0x10000) /* 0x800-0xffff: 3 bytes */
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{
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if ((len -= 3) < 0) return -1; /* overflow */
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dst[2] = 0x80 | (val & 0x3f);
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val >>= 6;
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dst[1] = 0x80 | (val & 0x3f);
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val >>= 6;
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dst[0] = 0xe0 | val;
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dst += 3;
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}
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else /* 0x10000-0x10ffff: 4 bytes */
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{
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if ((len -= 4) < 0) return -1; /* overflow */
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dst[3] = 0x80 | (val & 0x3f);
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val >>= 6;
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dst[2] = 0x80 | (val & 0x3f);
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val >>= 6;
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dst[1] = 0x80 | (val & 0x3f);
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val >>= 6;
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dst[0] = 0xf0 | val;
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dst += 4;
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src++;
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srclen--;
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}
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}
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return dstlen - len;
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}
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/* helper for the various utf8 mbstowcs functions */
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static inline unsigned int decode_utf8_char( unsigned char ch, const char **str, const char *strend )
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{
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unsigned int len = utf8_length[ch-0x80];
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unsigned int res = ch & utf8_mask[len];
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const char *end = *str + len;
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if (end > strend) return ~0;
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switch(len)
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{
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case 3:
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if ((ch = end[-3] ^ 0x80) >= 0x40) break;
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res = (res << 6) | ch;
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(*str)++;
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case 2:
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if ((ch = end[-2] ^ 0x80) >= 0x40) break;
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res = (res << 6) | ch;
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(*str)++;
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case 1:
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if ((ch = end[-1] ^ 0x80) >= 0x40) break;
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res = (res << 6) | ch;
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(*str)++;
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if (res < utf8_minval[len]) break;
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return res;
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}
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return ~0;
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}
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/* query necessary dst length for src string with composition */
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static inline int get_length_mbs_utf8_compose( int flags, const char *src, int srclen )
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{
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int ret = 0;
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unsigned int res;
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WCHAR composed[2];
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const char *srcend = src + srclen;
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composed[0] = 0;
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while (src < srcend)
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{
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unsigned char ch = *src++;
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if (ch < 0x80) /* special fast case for 7-bit ASCII */
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{
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composed[0] = ch;
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ret++;
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continue;
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}
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if ((res = decode_utf8_char( ch, &src, srcend )) <= 0xffff)
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{
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if (composed[0])
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{
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composed[1] = res;
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if ((composed[0] = wine_compose( composed ))) continue;
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}
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composed[0] = res;
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ret++;
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}
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else if (res <= 0x10ffff)
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{
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ret += 2;
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composed[0] = 0; /* no composition for surrogates */
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}
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else if (flags & MB_ERR_INVALID_CHARS) return -2; /* bad char */
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/* otherwise ignore it */
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}
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return ret;
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}
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/* UTF-8 to wide char string conversion with composition */
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/* return -1 on dst buffer overflow, -2 on invalid input char */
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static int utf8_mbstowcs_compose( int flags, const char *src, int srclen, WCHAR *dst, int dstlen )
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{
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unsigned int res;
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const char *srcend = src + srclen;
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WCHAR composed[2];
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WCHAR *dstend = dst + dstlen;
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if (!dstlen) return get_length_mbs_utf8_compose( flags, src, srclen );
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composed[0] = 0;
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while (src < srcend)
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{
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unsigned char ch = *src++;
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if (ch < 0x80) /* special fast case for 7-bit ASCII */
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{
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if (dst >= dstend) return -1; /* overflow */
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*dst++ = composed[0] = ch;
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continue;
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}
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if ((res = decode_utf8_char( ch, &src, srcend )) <= 0xffff)
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{
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if (composed[0])
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{
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composed[1] = res;
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if ((composed[0] = wine_compose( composed )))
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{
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dst[-1] = composed[0];
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continue;
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}
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}
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if (dst >= dstend) return -1; /* overflow */
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*dst++ = composed[0] = res;
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}
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else if (res <= 0x10ffff) /* we need surrogates */
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{
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if (dst >= dstend - 1) return -1; /* overflow */
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res -= 0x10000;
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*dst++ = 0xd800 | (res >> 10);
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*dst++ = 0xdc00 | (res & 0x3ff);
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composed[0] = 0; /* no composition for surrogates */
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}
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else if (flags & MB_ERR_INVALID_CHARS) return -2; /* bad char */
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/* otherwise ignore it */
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}
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return dstlen - (dstend - dst);
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}
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/* query necessary dst length for src string */
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static inline int get_length_mbs_utf8( int flags, const char *src, int srclen )
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{
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int ret = 0;
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unsigned int res;
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const char *srcend = src + srclen;
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while (src < srcend)
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{
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unsigned char ch = *src++;
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if (ch < 0x80) /* special fast case for 7-bit ASCII */
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{
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ret++;
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continue;
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}
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if ((res = decode_utf8_char( ch, &src, srcend )) <= 0x10ffff)
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{
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if (res > 0xffff) ret++;
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ret++;
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}
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else if (flags & MB_ERR_INVALID_CHARS) return -2; /* bad char */
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/* otherwise ignore it */
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}
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return ret;
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}
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/* UTF-8 to wide char string conversion */
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/* return -1 on dst buffer overflow, -2 on invalid input char */
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int wine_utf8_mbstowcs( int flags, const char *src, int srclen, WCHAR *dst, int dstlen )
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{
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unsigned int res;
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const char *srcend = src + srclen;
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WCHAR *dstend = dst + dstlen;
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if (flags & MB_COMPOSITE) return utf8_mbstowcs_compose( flags, src, srclen, dst, dstlen );
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if (!dstlen) return get_length_mbs_utf8( flags, src, srclen );
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while ((dst < dstend) && (src < srcend))
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{
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unsigned char ch = *src++;
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if (ch < 0x80) /* special fast case for 7-bit ASCII */
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{
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*dst++ = ch;
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continue;
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}
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if ((res = decode_utf8_char( ch, &src, srcend )) <= 0xffff)
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{
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*dst++ = res;
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}
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else if (res <= 0x10ffff) /* we need surrogates */
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{
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if (dst == dstend - 1) return -1; /* overflow */
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res -= 0x10000;
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*dst++ = 0xd800 | (res >> 10);
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*dst++ = 0xdc00 | (res & 0x3ff);
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}
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else if (flags & MB_ERR_INVALID_CHARS) return -2; /* bad char */
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/* otherwise ignore it */
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}
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if (src < srcend) return -1; /* overflow */
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return dstlen - (dstend - dst);
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}
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