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reactos/sdk/tools/unicode/mbtowc.c

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/*
* MultiByteToWideChar implementation
*
* Copyright 2000 Alexandre Julliard
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <string.h>
#include "wine/unicode.h"
extern unsigned int wine_decompose( WCHAR ch, WCHAR *dst, unsigned int dstlen );
/* check the code whether it is in Unicode Private Use Area (PUA). */
/* MB_ERR_INVALID_CHARS raises an error converting from 1-byte character to PUA. */
static inline int is_private_use_area_char(WCHAR code)
{
return (code >= 0xe000 && code <= 0xf8ff);
}
/* check src string for invalid chars; return non-zero if invalid char found */
static inline int check_invalid_chars_sbcs( const struct sbcs_table *table, int flags,
const unsigned char *src, unsigned int srclen )
{
const WCHAR * const cp2uni = (flags & MB_USEGLYPHCHARS) ? table->cp2uni_glyphs : table->cp2uni;
const WCHAR def_unicode_char = table->info.def_unicode_char;
const unsigned char def_char = table->uni2cp_low[table->uni2cp_high[def_unicode_char >> 8]
+ (def_unicode_char & 0xff)];
while (srclen)
{
if ((cp2uni[*src] == def_unicode_char && *src != def_char) ||
is_private_use_area_char(cp2uni[*src])) break;
src++;
srclen--;
}
return srclen;
}
/* mbstowcs for single-byte code page */
/* all lengths are in characters, not bytes */
static inline int mbstowcs_sbcs( const struct sbcs_table *table, int flags,
const unsigned char *src, unsigned int srclen,
WCHAR *dst, unsigned int dstlen )
{
const WCHAR * const cp2uni = (flags & MB_USEGLYPHCHARS) ? table->cp2uni_glyphs : table->cp2uni;
int ret = srclen;
if (dstlen < srclen)
{
/* buffer too small: fill it up to dstlen and return error */
srclen = dstlen;
ret = -1;
}
for (;;)
{
switch(srclen)
{
default:
case 16: dst[15] = cp2uni[src[15]];
case 15: dst[14] = cp2uni[src[14]];
case 14: dst[13] = cp2uni[src[13]];
case 13: dst[12] = cp2uni[src[12]];
case 12: dst[11] = cp2uni[src[11]];
case 11: dst[10] = cp2uni[src[10]];
case 10: dst[9] = cp2uni[src[9]];
case 9: dst[8] = cp2uni[src[8]];
case 8: dst[7] = cp2uni[src[7]];
case 7: dst[6] = cp2uni[src[6]];
case 6: dst[5] = cp2uni[src[5]];
case 5: dst[4] = cp2uni[src[4]];
case 4: dst[3] = cp2uni[src[3]];
case 3: dst[2] = cp2uni[src[2]];
case 2: dst[1] = cp2uni[src[1]];
case 1: dst[0] = cp2uni[src[0]];
case 0: break;
}
if (srclen < 16) return ret;
dst += 16;
src += 16;
srclen -= 16;
}
}
/* mbstowcs for single-byte code page with char decomposition */
static int mbstowcs_sbcs_decompose( const struct sbcs_table *table, int flags,
const unsigned char *src, unsigned int srclen,
WCHAR *dst, unsigned int dstlen )
{
const WCHAR * const cp2uni = (flags & MB_USEGLYPHCHARS) ? table->cp2uni_glyphs : table->cp2uni;
unsigned int len;
if (!dstlen) /* compute length */
{
WCHAR dummy[4]; /* no decomposition is larger than 4 chars */
for (len = 0; srclen; srclen--, src++)
len += wine_decompose( cp2uni[*src], dummy, 4 );
return len;
}
for (len = dstlen; srclen && len; srclen--, src++)
{
unsigned int res = wine_decompose( cp2uni[*src], dst, len );
if (!res) break;
len -= res;
dst += res;
}
if (srclen) return -1; /* overflow */
return dstlen - len;
}
/* query necessary dst length for src string */
static inline int get_length_dbcs( const struct dbcs_table *table,
const unsigned char *src, unsigned int srclen )
{
const unsigned char * const cp2uni_lb = table->cp2uni_leadbytes;
int len;
for (len = 0; srclen; srclen--, src++, len++)
{
if (cp2uni_lb[*src] && srclen > 1 && src[1])
{
src++;
srclen--;
}
}
return len;
}
/* check src string for invalid chars; return non-zero if invalid char found */
static inline int check_invalid_chars_dbcs( const struct dbcs_table *table,
const unsigned char *src, unsigned int srclen )
{
const WCHAR * const cp2uni = table->cp2uni;
const unsigned char * const cp2uni_lb = table->cp2uni_leadbytes;
const WCHAR def_unicode_char = table->info.def_unicode_char;
const unsigned short def_char = table->uni2cp_low[table->uni2cp_high[def_unicode_char >> 8]
+ (def_unicode_char & 0xff)];
while (srclen)
{
unsigned char off = cp2uni_lb[*src];
if (off) /* multi-byte char */
{
if (srclen == 1) break; /* partial char, error */
if (cp2uni[(off << 8) + src[1]] == def_unicode_char &&
((src[0] << 8) | src[1]) != def_char) break;
src++;
srclen--;
}
else if ((cp2uni[*src] == def_unicode_char && *src != def_char) ||
is_private_use_area_char(cp2uni[*src])) break;
src++;
srclen--;
}
return srclen;
}
/* mbstowcs for double-byte code page */
/* all lengths are in characters, not bytes */
static inline int mbstowcs_dbcs( const struct dbcs_table *table,
const unsigned char *src, unsigned int srclen,
WCHAR *dst, unsigned int dstlen )
{
const WCHAR * const cp2uni = table->cp2uni;
const unsigned char * const cp2uni_lb = table->cp2uni_leadbytes;
unsigned int len;
if (!dstlen) return get_length_dbcs( table, src, srclen );
for (len = dstlen; srclen && len; len--, srclen--, src++, dst++)
{
unsigned char off = cp2uni_lb[*src];
if (off && srclen > 1 && src[1])
{
src++;
srclen--;
*dst = cp2uni[(off << 8) + *src];
}
else *dst = cp2uni[*src];
}
if (srclen) return -1; /* overflow */
return dstlen - len;
}
/* mbstowcs for double-byte code page with character decomposition */
static int mbstowcs_dbcs_decompose( const struct dbcs_table *table,
const unsigned char *src, unsigned int srclen,
WCHAR *dst, unsigned int dstlen )
{
const WCHAR * const cp2uni = table->cp2uni;
const unsigned char * const cp2uni_lb = table->cp2uni_leadbytes;
unsigned int len, res;
WCHAR ch;
if (!dstlen) /* compute length */
{
WCHAR dummy[4]; /* no decomposition is larger than 4 chars */
for (len = 0; srclen; srclen--, src++)
{
unsigned char off = cp2uni_lb[*src];
if (off && srclen > 1 && src[1])
{
src++;
srclen--;
ch = cp2uni[(off << 8) + *src];
}
else ch = cp2uni[*src];
len += wine_decompose( ch, dummy, 4 );
}
return len;
}
for (len = dstlen; srclen && len; srclen--, src++)
{
unsigned char off = cp2uni_lb[*src];
if (off && srclen > 1 && src[1])
{
src++;
srclen--;
ch = cp2uni[(off << 8) + *src];
}
else ch = cp2uni[*src];
if (!(res = wine_decompose( ch, dst, len ))) break;
dst += res;
len -= res;
}
if (srclen) return -1; /* overflow */
return dstlen - len;
}
/* return -1 on dst buffer overflow, -2 on invalid input char */
int wine_cp_mbstowcs( const union cptable *table, int flags,
const char *s, int srclen,
WCHAR *dst, int dstlen )
{
const unsigned char *src = (const unsigned char*) s;
if (table->info.char_size == 1)
{
if (flags & MB_ERR_INVALID_CHARS)
{
if (check_invalid_chars_sbcs( &table->sbcs, flags, src, srclen )) return -2;
}
if (!(flags & MB_COMPOSITE))
{
if (!dstlen) return srclen;
return mbstowcs_sbcs( &table->sbcs, flags, src, srclen, dst, dstlen );
}
return mbstowcs_sbcs_decompose( &table->sbcs, flags, src, srclen, dst, dstlen );
}
else /* mbcs */
{
if (flags & MB_ERR_INVALID_CHARS)
{
if (check_invalid_chars_dbcs( &table->dbcs, src, srclen )) return -2;
}
if (!(flags & MB_COMPOSITE))
return mbstowcs_dbcs( &table->dbcs, src, srclen, dst, dstlen );
else
return mbstowcs_dbcs_decompose( &table->dbcs, src, srclen, dst, dstlen );
}
}
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