marko10_000
/
wine-wine
forked from Mirrors/wine-wine
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

libwine: Added support for Unicode surrogates in utf-8 conversions. 

Also make the conversions more strict against invalid input data.
oldstable
Alexandre Julliard 2007-03-14 15:58:56 +01:00
parent a79b26284a
commit 62c3d3d620
1 changed files with 113 additions and 60 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

173
libs/wine/utf8.c
View File

@ -29,30 +29,60 @@ static const char utf8_length[128] =
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0x90-0x9f */
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0xa0-0xaf */
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0xb0-0xbf */
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* 0xc0-0xcf */
0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* 0xc0-0xcf */
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* 0xd0-0xdf */
2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, /* 0xe0-0xef */
3,3,3,3,3,3,3,3,4,4,4,4,5,5,0,0 /* 0xf0-0xff */
3,3,3,3,3,0,0,0,0,0,0,0,0,0,0,0 /* 0xf0-0xff */
};
/* first byte mask depending on UTF-8 sequence length */
static const unsigned char utf8_mask[6] = { 0x7f, 0x1f, 0x0f, 0x07, 0x03, 0x01 };
static const unsigned char utf8_mask[4] = { 0x7f, 0x1f, 0x0f, 0x07 };
/* minimum Unicode value depending on UTF-8 sequence length */
static const unsigned int utf8_minval[6] = { 0x0, 0x80, 0x800, 0x10000, 0x200000, 0x4000000 };
static const unsigned int utf8_minval[4] = { 0x0, 0x80, 0x800, 0x10000 };
/* get the next char value taking surrogates into account */
static inline unsigned int get_surrogate_value( const WCHAR *src, unsigned int srclen )
{
if (src[0] >= 0xd800 && src[0] <= 0xdfff) /* surrogate pair */
{
if (src[0] > 0xdbff || /* invalid high surrogate */
srclen <= 1 || /* missing low surrogate */
src[1] < 0xdc00 || src[1] > 0xdfff) /* invalid low surrogate */
return 0;
return 0x10000 + ((src[0] & 0x3ff) << 10) + (src[1] & 0x3ff);
}
return src[0];
}
/* query necessary dst length for src string */
inline static int get_length_wcs_utf8( const WCHAR *src, unsigned int srclen )
static inline int get_length_wcs_utf8( int flags, const WCHAR *src, unsigned int srclen )
{
int len;
for (len = 0; srclen; srclen--, src++, len++)
unsigned int val;
for (len = 0; srclen; srclen--, src++)
{
if (*src >= 0x80)
if (*src < 0x80) /* 0x00-0x7f: 1 byte */
{
len++;
if (*src >= 0x800) len++;
continue;
}
if (*src < 0x800) /* 0x80-0x7ff: 2 bytes */
{
len += 2;
continue;
}
if (!(val = get_surrogate_value( src, srclen )))
{
if (flags & WC_ERR_INVALID_CHARS) return -2;
continue;
}
if (val < 0x10000) /* 0x800-0xffff: 3 bytes */
len += 3;
else /* 0x10000-0x10ffff: 4 bytes */
len += 4;
}
return len;
}
@ -63,11 +93,12 @@ int wine_utf8_wcstombs( int flags, const WCHAR *src, int srclen, char *dst, int
{
int len;
if (!dstlen) return get_length_wcs_utf8( src, srclen );
if (!dstlen) return get_length_wcs_utf8( flags, src, srclen );
for (len = dstlen; srclen; srclen--, src++)
{
WCHAR ch = *src;
unsigned int val;
if (ch < 0x80) /* 0x00-0x7f: 1 byte */
{
@ -86,53 +117,80 @@ int wine_utf8_wcstombs( int flags, const WCHAR *src, int srclen, char *dst, int
continue;
}
/* 0x800-0xffff: 3 bytes */
if (!(val = get_surrogate_value( src, srclen )))
{
if (flags & WC_ERR_INVALID_CHARS) return -2;
continue;
}
if ((len -= 3) < 0) return -1; /* overflow */
dst[2] = 0x80 | (ch & 0x3f);
ch >>= 6;
dst[1] = 0x80 | (ch & 0x3f);
ch >>= 6;
dst[0] = 0xe0 | ch;
dst += 3;
if (val < 0x10000) /* 0x800-0xffff: 3 bytes */
{
if ((len -= 3) < 0) return -1; /* overflow */
dst[2] = 0x80 | (val & 0x3f);
val >>= 6;
dst[1] = 0x80 | (val & 0x3f);
val >>= 6;
dst[0] = 0xe0 | val;
dst += 3;
}
else /* 0x10000-0x10ffff: 4 bytes */
{
if ((len -= 4) < 0) return -1; /* overflow */
dst[3] = 0x80 | (val & 0x3f);
val >>= 6;
dst[2] = 0x80 | (val & 0x3f);
val >>= 6;
dst[1] = 0x80 | (val & 0x3f);
val >>= 6;
dst[0] = 0xf0 | val;
dst += 4;
}
}
return dstlen - len;
}
/* query necessary dst length for src string */
inline static int get_length_mbs_utf8( const unsigned char *src, int srclen )
inline static int get_length_mbs_utf8( int flags, const char *src, int srclen )
{
int ret;
const unsigned char *srcend = src + srclen;
int len, ret = 0;
unsigned int res;
const char *srcend = src + srclen;
for (ret = 0; src < srcend; ret++)
while (src < srcend)
{
unsigned char ch = *src++;
if (ch < 0xc0) continue;
switch(utf8_length[ch-0x80])
if (ch < 0x80) /* special fast case for 7-bit ASCII */
{
ret++;
continue;
}
len = utf8_length[ch-0x80];
if (src + len > srcend) goto bad;
res = ch & utf8_mask[len];
switch(len)
{
case 5:
if (src >= srcend) return ret; /* ignore partial char */
if ((ch = *src ^ 0x80) >= 0x40) continue;
src++;
case 4:
if (src >= srcend) return ret; /* ignore partial char */
if ((ch = *src ^ 0x80) >= 0x40) continue;
src++;
case 3:
if (src >= srcend) return ret; /* ignore partial char */
if ((ch = *src ^ 0x80) >= 0x40) continue;
if ((ch = *src ^ 0x80) >= 0x40) goto bad;
res = (res << 6) | ch;
src++;
case 2:
if (src >= srcend) return ret; /* ignore partial char */
if ((ch = *src ^ 0x80) >= 0x40) continue;
if ((ch = *src ^ 0x80) >= 0x40) goto bad;
res = (res << 6) | ch;
src++;
case 1:
if (src >= srcend) return ret; /* ignore partial char */
if ((ch = *src ^ 0x80) >= 0x40) continue;
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 */
/* otherwise ignore it */
}
return ret;
}
@ -141,60 +199,55 @@ inline static int get_length_mbs_utf8( const unsigned 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, count;
int len;
unsigned int res;
const char *srcend = src + srclen;
WCHAR *dstend = dst + dstlen;
if (!dstlen) return get_length_mbs_utf8( (const unsigned char*)src, srclen );
if (!dstlen) return get_length_mbs_utf8( flags, src, srclen );
for (count = dstlen; count && (src < srcend); count--, dst++)
while ((dst < dstend) && (src < srcend))
{
unsigned char ch = *src++;
if (ch < 0x80) /* special fast case for 7-bit ASCII */
{
*dst = ch;
*dst++ = ch;
continue;
}
len = utf8_length[ch-0x80];
if (src + len > srcend) goto bad;
res = ch & utf8_mask[len];
switch(len)
{
case 5:
if (src >= srcend) goto done; /* ignore partial char */
if ((ch = *src ^ 0x80) >= 0x40) goto bad;
res = (res << 6) | ch;
src++;
case 4:
if (src >= srcend) goto done; /* ignore partial char */
if ((ch = *src ^ 0x80) >= 0x40) goto bad;
res = (res << 6) | ch;
src++;
case 3:
if (src >= srcend) goto done; /* ignore partial char */
if ((ch = *src ^ 0x80) >= 0x40) goto bad;
res = (res << 6) | ch;
src++;
case 2:
if (src >= srcend) goto done; /* ignore partial char */
if ((ch = *src ^ 0x80) >= 0x40) goto bad;
res = (res << 6) | ch;
src++;
case 1:
if (src >= srcend) goto done; /* ignore partial char */
if ((ch = *src ^ 0x80) >= 0x40) goto bad;
res = (res << 6) | ch;
src++;
if (res < utf8_minval[len]) goto bad;
if (res >= 0x10000) goto bad; /* FIXME: maybe we should do surrogates here */
*dst = res;
if (res > 0x10ffff) goto bad;
if (res <= 0xffff) *dst++ = res;
else /* 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 */
*dst = (WCHAR)'?';
/* otherwise ignore it */
}
if (src < srcend) return -1; /* overflow */
done:
return dstlen - count;
return dstlen - (dstend - dst);
}