ReceiveTempSMS
/
Sweden-Number
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

libwine: Abstract part of the utf8 char decoding to a separate function.

This commit is contained in:
Alexandre Julliard 2008-02-15 12:06:42 +01:00
parent 70c4b66781
commit dbefd038ac
1 changed files with 41 additions and 54 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

85
libs/wine/utf8.c
View File

@ -155,10 +155,38 @@ int wine_utf8_wcstombs( int flags, const WCHAR *src, int srclen, char *dst, int
return dstlen - len; return dstlen - len;
} }
/* helper for the various utf8 mbstowcs functions */
static inline unsigned int decode_utf8_char( unsigned char ch, const char **str, const char *strend )
{
unsigned int len = utf8_length[ch-0x80];
unsigned int res = ch & utf8_mask[len];
const char *end = *str + len;
if (end > strend) return ~0;
switch(len)
{
case 3:
if ((ch = end[-3] ^ 0x80) >= 0x40) break;
res = (res << 6) | ch;
(*str)++;
case 2:
if ((ch = end[-2] ^ 0x80) >= 0x40) break;
res = (res << 6) | ch;
(*str)++;
case 1:
if ((ch = end[-1] ^ 0x80) >= 0x40) break;
res = (res << 6) | ch;
(*str)++;
if (res < utf8_minval[len]) break;
return res;
}
return ~0;
}
/* query necessary dst length for src string */ /* query necessary dst length for src string */
static inline int get_length_mbs_utf8( int flags, const char *src, int srclen ) static inline int get_length_mbs_utf8( int flags, const char *src, int srclen )
{ {
int len, ret = 0; int ret = 0;
unsigned int res; unsigned int res;
const char *srcend = src + srclen; const char *srcend = src + srclen;
@ -170,32 +198,12 @@ static inline int get_length_mbs_utf8( int flags, const char *src, int srclen )
ret++; ret++;
continue; continue;
} }
len = utf8_length[ch-0x80]; if ((res = decode_utf8_char( ch, &src, srcend )) <= 0x10ffff)
if (src + len > srcend) goto bad;
res = ch & utf8_mask[len];
switch(len)
{ {
case 3:
if ((ch = *src ^ 0x80) >= 0x40) goto bad;
res = (res << 6) | ch;
src++;
case 2:
if ((ch = *src ^ 0x80) >= 0x40) goto bad;
res = (res << 6) | ch;
src++;
case 1:
if ((ch = *src ^ 0x80) >= 0x40) goto bad;
res = (res << 6) | ch;
src++;
if (res < utf8_minval[len]) goto bad;
if (res > 0x10ffff) goto bad;
if (res > 0xffff) ret++; if (res > 0xffff) ret++;
ret++; ret++;
continue;
} }
bad: else if (flags & MB_ERR_INVALID_CHARS) return -2; /* bad char */
if (flags & MB_ERR_INVALID_CHARS) return -2; /* bad char */
/* otherwise ignore it */ /* otherwise ignore it */
} }
return ret; return ret;
@ -205,7 +213,6 @@ static inline int get_length_mbs_utf8( int flags, const char *src, int srclen )
/* return -1 on dst buffer overflow, -2 on invalid input char */ /* return -1 on dst buffer overflow, -2 on invalid input char */
int wine_utf8_mbstowcs( int flags, const char *src, int srclen, WCHAR *dst, int dstlen ) int wine_utf8_mbstowcs( int flags, const char *src, int srclen, WCHAR *dst, int dstlen )
{ {
int len;
unsigned int res; unsigned int res;
const char *srcend = src + srclen; const char *srcend = src + srclen;
WCHAR *dstend = dst + dstlen; WCHAR *dstend = dst + dstlen;
@ -220,38 +227,18 @@ int wine_utf8_mbstowcs( int flags, const char *src, int srclen, WCHAR *dst, int
*dst++ = ch; *dst++ = ch;
continue; continue;
} }
len = utf8_length[ch-0x80]; if ((res = decode_utf8_char( ch, &src, srcend )) <= 0xffff)
if (src + len > srcend) goto bad;
res = ch & utf8_mask[len];
switch(len)
{ {
case 3: *dst++ = res;
if ((ch = *src ^ 0x80) >= 0x40) goto bad; }
res = (res << 6) | ch; else if (res <= 0x10ffff) /* we need surrogates */
src++;
case 2:
if ((ch = *src ^ 0x80) >= 0x40) goto bad;
res = (res << 6) | ch;
src++;
case 1:
if ((ch = *src ^ 0x80) >= 0x40) goto bad;
res = (res << 6) | ch;
src++;
if (res < utf8_minval[len]) goto bad;
if (res > 0x10ffff) goto bad;
if (res <= 0xffff) *dst++ = res;
else /* we need surrogates */
{ {
if (dst == dstend - 1) return -1; /* overflow */ if (dst == dstend - 1) return -1; /* overflow */
res -= 0x10000; res -= 0x10000;
*dst++ = 0xd800 | (res >> 10); *dst++ = 0xd800 | (res >> 10);
*dst++ = 0xdc00 | (res & 0x3ff); *dst++ = 0xdc00 | (res & 0x3ff);
} }
continue; else if (flags & MB_ERR_INVALID_CHARS) return -2; /* bad char */
}
bad:
if (flags & MB_ERR_INVALID_CHARS) return -2; /* bad char */
/* otherwise ignore it */ /* otherwise ignore it */
} }
if (src < srcend) return -1; /* overflow */ if (src < srcend) return -1; /* overflow */