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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
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85
libs/wine/utf8.c
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@ -155,10 +155,38 @@ int wine_utf8_wcstombs( int flags, const WCHAR *src, int srclen, char *dst, int
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 */
static inline int get_length_mbs_utf8( int flags, const char *src, int srclen )
{
int len, ret = 0;
int ret = 0;
unsigned int res;
const char *srcend = src + srclen;
@ -170,32 +198,12 @@ static inline int get_length_mbs_utf8( int flags, const char *src, int srclen )
ret++;
continue;
}
len = utf8_length[ch-0x80];
if (src + len > srcend) goto bad;
res = ch & utf8_mask[len];
switch(len)
if ((res = decode_utf8_char( ch, &src, srcend )) <= 0x10ffff)
{
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++;
ret++;
continue;
}
bad:
if (flags & MB_ERR_INVALID_CHARS) return -2; /* bad char */
else if (flags & MB_ERR_INVALID_CHARS) return -2; /* bad char */
/* otherwise ignore it */
}
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 */
int wine_utf8_mbstowcs( int flags, const char *src, int srclen, WCHAR *dst, int dstlen )
{
int len;
unsigned int res;
const char *srcend = src + srclen;
WCHAR *dstend = dst + dstlen;
@ -220,38 +227,18 @@ int wine_utf8_mbstowcs( int flags, const char *src, int srclen, WCHAR *dst, int
*dst++ = ch;
continue;
}
len = utf8_length[ch-0x80];
if (src + len > srcend) goto bad;
res = ch & utf8_mask[len];
switch(len)
if ((res = decode_utf8_char( ch, &src, srcend )) <= 0xffff)
{
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) *dst++ = res;
else /* we need surrogates */
*dst++ = res;
}
else if (res <= 0x10ffff) /* we need surrogates */
{
if (dst == dstend - 1) return -1; /* overflow */
res -= 0x10000;
*dst++ = 0xd800 | (res >> 10);
*dst++ = 0xdc00 | (res & 0x3ff);
}
continue;
}
bad:
if (flags & MB_ERR_INVALID_CHARS) return -2; /* bad char */
else if (flags & MB_ERR_INVALID_CHARS) return -2; /* bad char */
/* otherwise ignore it */
}
if (src < srcend) return -1; /* overflow */