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Werner Koch
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ec8c9d9494
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236
complus/utf8.c
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236
complus/utf8.c
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/*
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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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* Taken from WINE, so the usual WINE copyright applies:
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <windows.h>
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#include <ole2.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 utf8_wcstombs( const WCHAR *src, int srclen, char *dst, int dstlen )
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{
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char *orig_dst = dst;
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if (!dstlen) return get_length_wcs_utf8( src, srclen );
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for (; 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 dst - orig_dst;
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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 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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int
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bstrtoutf8 ( BSTR src, char *dst, size_t dstlen )
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{
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size_t srclen, needed;
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int n;
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srclen = src? SysStringLen (src): 0;
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needed = srclen? (utf8_wcstombs (src, srclen, NULL, 0) + 1) : 1;
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if (!dst || !dstlen)
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return needed;
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if (dstlen < needed)
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return -1;
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if (srclen) {
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n = utf8_wcstombs (src, srclen, dst, dstlen);
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if (n < 0)
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return -1;
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}
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else
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n = 0;
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dst[n] = 0;
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return n;
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}
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