202 lines
6.2 KiB
C
202 lines
6.2 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <string.h>
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#include "winnls.h"
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#include "wine/unicode.h"
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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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1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* 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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3,3,3,3,3,3,3,3,4,4,4,4,5,5,0,0 /* 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[6] = { 0x7f, 0x1f, 0x0f, 0x07, 0x03, 0x01 };
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/* minimum Unicode value depending on UTF-8 sequence length */
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static const unsigned int utf8_minval[6] = { 0x0, 0x80, 0x800, 0x10000, 0x200000, 0x4000000 };
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/* query necessary dst length for src string */
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inline static int get_length_wcs_utf8( const WCHAR *src, unsigned int srclen )
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{
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int len;
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for (len = 0; srclen; srclen--, src++, len++)
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{
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if (*src >= 0x80)
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{
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len++;
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if (*src >= 0x800) len++;
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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 */
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int wine_utf8_wcstombs( const WCHAR *src, int srclen, char *dst, int dstlen )
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{
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int ret = srclen;
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if (!dstlen) return get_length_wcs_utf8( src, srclen );
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for (ret = srclen; srclen; srclen--, src++)
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{
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WCHAR ch = *src;
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if (ch < 0x80) /* 0x00-0x7f: 1 byte */
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{
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if (!dstlen--) 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 ((dstlen -= 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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/* 0x800-0xffff: 3 bytes */
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if ((dstlen -= 3) < 0) return -1; /* overflow */
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dst[2] = 0x80 | (ch & 0x3f);
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ch >>= 6;
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dst[1] = 0x80 | (ch & 0x3f);
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ch >>= 6;
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dst[0] = 0xe0 | ch;
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dst += 3;
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}
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return ret;
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}
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/* query necessary dst length for src string */
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inline static int get_length_mbs_utf8( const unsigned char *src, int srclen )
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{
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int ret;
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const unsigned char *srcend = src + srclen;
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for (ret = 0; src < srcend; ret++)
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{
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unsigned char ch = *src++;
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if (ch < 0xc0) continue;
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switch(utf8_length[ch-0x80])
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{
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case 5:
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if (src >= srcend) return ret; /* ignore partial char */
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if ((ch = *src ^ 0x80) >= 0x40) continue;
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src++;
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case 4:
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if (src >= srcend) return ret; /* ignore partial char */
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if ((ch = *src ^ 0x80) >= 0x40) continue;
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src++;
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case 3:
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if (src >= srcend) return ret; /* ignore partial char */
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if ((ch = *src ^ 0x80) >= 0x40) continue;
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src++;
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case 2:
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if (src >= srcend) return ret; /* ignore partial char */
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if ((ch = *src ^ 0x80) >= 0x40) continue;
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src++;
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case 1:
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if (src >= srcend) return ret; /* ignore partial char */
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if ((ch = *src ^ 0x80) >= 0x40) continue;
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src++;
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}
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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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int len, count;
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unsigned int res;
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const char *srcend = src + srclen;
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if (!dstlen) return get_length_mbs_utf8( src, srclen );
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for (count = dstlen; count && (src < srcend); count--, dst++)
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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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len = utf8_length[ch-0x80];
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res = ch & utf8_mask[len];
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switch(len)
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{
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case 5:
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if (src >= srcend) goto done; /* ignore partial char */
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if ((ch = *src ^ 0x80) >= 0x40) goto bad;
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res = (res << 6) | ch;
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src++;
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case 4:
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if (src >= srcend) goto done; /* ignore partial char */
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if ((ch = *src ^ 0x80) >= 0x40) goto bad;
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res = (res << 6) | ch;
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src++;
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case 3:
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if (src >= srcend) goto done; /* ignore partial char */
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if ((ch = *src ^ 0x80) >= 0x40) goto bad;
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res = (res << 6) | ch;
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src++;
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case 2:
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if (src >= srcend) goto done; /* ignore partial char */
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if ((ch = *src ^ 0x80) >= 0x40) goto bad;
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res = (res << 6) | ch;
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src++;
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case 1:
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if (src >= srcend) goto done; /* ignore partial char */
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if ((ch = *src ^ 0x80) >= 0x40) goto bad;
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res = (res << 6) | ch;
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src++;
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if (res < utf8_minval[len]) goto bad;
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if (res >= 0x10000) goto bad; /* FIXME: maybe we should do surrogates here */
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*dst = res;
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continue;
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}
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bad:
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if (flags & MB_ERR_INVALID_CHARS) return -2; /* bad char */
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*dst = (WCHAR)'?';
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}
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if (src < srcend) return -1; /* overflow */
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done:
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return dstlen - count;
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}
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