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446 lines
16 KiB
C
446 lines
16 KiB
C
/*
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* WideCharToMultiByte implementation
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*
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* Copyright 2000 Alexandre Julliard
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <string.h>
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#include "winnls.h"
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#include "wine/unicode.h"
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/* search for a character in the unicode_compose_table; helper for compose() */
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static inline int binary_search( WCHAR ch, int low, int high )
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{
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extern const WCHAR unicode_compose_table[];
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while (low <= high)
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{
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int pos = (low + high) / 2;
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if (unicode_compose_table[2*pos] < ch)
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{
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low = pos + 1;
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continue;
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}
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if (unicode_compose_table[2*pos] > ch)
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{
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high = pos - 1;
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continue;
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}
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return pos;
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}
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return -1;
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}
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/* return the result of the composition of two Unicode chars, or 0 if none */
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static WCHAR compose( const WCHAR *str )
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{
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extern const WCHAR unicode_compose_table[];
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extern const unsigned int unicode_compose_table_size;
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int idx = 1, low = 0, high = unicode_compose_table_size - 1;
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for (;;)
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{
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int pos = binary_search( str[idx], low, high );
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if (pos == -1) return 0;
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if (!idx--) return unicode_compose_table[2*pos+1];
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low = unicode_compose_table[2*pos+1];
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high = unicode_compose_table[2*pos+3] - 1;
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}
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}
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/****************************************************************/
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/* sbcs support */
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/* check if 'ch' is an acceptable sbcs mapping for 'wch' */
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static inline int is_valid_sbcs_mapping( const struct sbcs_table *table, int flags,
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WCHAR wch, unsigned char ch )
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{
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if (flags & WC_NO_BEST_FIT_CHARS) return (table->cp2uni[ch] == wch);
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if (ch != (unsigned char)table->info.def_char) return 1;
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return (wch == table->info.def_unicode_char);
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}
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/* query necessary dst length for src string */
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static int get_length_sbcs( const struct sbcs_table *table, int flags,
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const WCHAR *src, unsigned int srclen, int *used )
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{
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const unsigned char * const uni2cp_low = table->uni2cp_low;
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const unsigned short * const uni2cp_high = table->uni2cp_high;
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int ret, tmp;
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WCHAR composed;
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if (!used) used = &tmp; /* avoid checking on every char */
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*used = 0;
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for (ret = 0; srclen; ret++, src++, srclen--)
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{
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WCHAR wch = *src;
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unsigned char ch;
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if ((flags & WC_COMPOSITECHECK) && (srclen > 1) && (composed = compose(src)))
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{
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/* now check if we can use the composed char */
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ch = uni2cp_low[uni2cp_high[composed >> 8] + (composed & 0xff)];
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if (is_valid_sbcs_mapping( table, flags, composed, ch ))
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{
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/* we have a good mapping, use it */
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src++;
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srclen--;
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continue;
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}
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/* no mapping for the composed char, check the other flags */
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if (flags & WC_DEFAULTCHAR) /* use the default char instead */
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{
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*used = 1;
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src++; /* skip the non-spacing char */
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srclen--;
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continue;
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}
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if (flags & WC_DISCARDNS) /* skip the second char of the composition */
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{
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src++;
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srclen--;
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}
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/* WC_SEPCHARS is the default */
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}
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if (!*used)
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{
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ch = uni2cp_low[uni2cp_high[wch >> 8] + (wch & 0xff)];
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*used = !is_valid_sbcs_mapping( table, flags, wch, ch );
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}
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}
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return ret;
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}
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/* wcstombs for single-byte code page */
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static inline int wcstombs_sbcs( const struct sbcs_table *table,
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const WCHAR *src, unsigned int srclen,
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char *dst, unsigned int dstlen )
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{
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const unsigned char * const uni2cp_low = table->uni2cp_low;
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const unsigned short * const uni2cp_high = table->uni2cp_high;
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int ret = srclen;
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if (dstlen < srclen)
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{
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/* buffer too small: fill it up to dstlen and return error */
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srclen = dstlen;
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ret = -1;
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}
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for (;;)
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{
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switch(srclen)
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{
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default:
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case 16: dst[15] = uni2cp_low[uni2cp_high[src[15] >> 8] + (src[15] & 0xff)];
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case 15: dst[14] = uni2cp_low[uni2cp_high[src[14] >> 8] + (src[14] & 0xff)];
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case 14: dst[13] = uni2cp_low[uni2cp_high[src[13] >> 8] + (src[13] & 0xff)];
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case 13: dst[12] = uni2cp_low[uni2cp_high[src[12] >> 8] + (src[12] & 0xff)];
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case 12: dst[11] = uni2cp_low[uni2cp_high[src[11] >> 8] + (src[11] & 0xff)];
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case 11: dst[10] = uni2cp_low[uni2cp_high[src[10] >> 8] + (src[10] & 0xff)];
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case 10: dst[9] = uni2cp_low[uni2cp_high[src[9] >> 8] + (src[9] & 0xff)];
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case 9: dst[8] = uni2cp_low[uni2cp_high[src[8] >> 8] + (src[8] & 0xff)];
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case 8: dst[7] = uni2cp_low[uni2cp_high[src[7] >> 8] + (src[7] & 0xff)];
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case 7: dst[6] = uni2cp_low[uni2cp_high[src[6] >> 8] + (src[6] & 0xff)];
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case 6: dst[5] = uni2cp_low[uni2cp_high[src[5] >> 8] + (src[5] & 0xff)];
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case 5: dst[4] = uni2cp_low[uni2cp_high[src[4] >> 8] + (src[4] & 0xff)];
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case 4: dst[3] = uni2cp_low[uni2cp_high[src[3] >> 8] + (src[3] & 0xff)];
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case 3: dst[2] = uni2cp_low[uni2cp_high[src[2] >> 8] + (src[2] & 0xff)];
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case 2: dst[1] = uni2cp_low[uni2cp_high[src[1] >> 8] + (src[1] & 0xff)];
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case 1: dst[0] = uni2cp_low[uni2cp_high[src[0] >> 8] + (src[0] & 0xff)];
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case 0: break;
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}
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if (srclen < 16) return ret;
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dst += 16;
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src += 16;
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srclen -= 16;
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}
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}
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/* slow version of wcstombs_sbcs that handles the various flags */
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static int wcstombs_sbcs_slow( const struct sbcs_table *table, int flags,
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const WCHAR *src, unsigned int srclen,
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char *dst, unsigned int dstlen,
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const char *defchar, int *used )
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{
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const unsigned char * const uni2cp_low = table->uni2cp_low;
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const unsigned short * const uni2cp_high = table->uni2cp_high;
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const unsigned char table_default = table->info.def_char & 0xff;
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unsigned int len;
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int tmp;
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WCHAR composed;
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if (!defchar) defchar = &table_default;
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if (!used) used = &tmp; /* avoid checking on every char */
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*used = 0;
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for (len = dstlen; srclen && len; dst++, len--, src++, srclen--)
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{
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WCHAR wch = *src;
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if ((flags & WC_COMPOSITECHECK) && (srclen > 1) && (composed = compose(src)))
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{
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/* now check if we can use the composed char */
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*dst = uni2cp_low[uni2cp_high[composed >> 8] + (composed & 0xff)];
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if (is_valid_sbcs_mapping( table, flags, composed, *dst ))
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{
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/* we have a good mapping, use it */
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src++;
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srclen--;
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continue;
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}
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/* no mapping for the composed char, check the other flags */
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if (flags & WC_DEFAULTCHAR) /* use the default char instead */
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{
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*dst = *defchar;
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*used = 1;
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src++; /* skip the non-spacing char */
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srclen--;
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continue;
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}
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if (flags & WC_DISCARDNS) /* skip the second char of the composition */
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{
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src++;
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srclen--;
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}
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/* WC_SEPCHARS is the default */
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}
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*dst = uni2cp_low[uni2cp_high[wch >> 8] + (wch & 0xff)];
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if (!is_valid_sbcs_mapping( table, flags, wch, *dst ))
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{
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*dst = *defchar;
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*used = 1;
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}
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}
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if (srclen) return -1; /* overflow */
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return dstlen - len;
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}
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/****************************************************************/
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/* dbcs support */
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/* check if 'ch' is an acceptable dbcs mapping for 'wch' */
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static inline int is_valid_dbcs_mapping( const struct dbcs_table *table, int flags,
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WCHAR wch, unsigned short ch )
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{
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if (ch == table->info.def_char && wch != table->info.def_unicode_char) return 0;
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if (flags & WC_NO_BEST_FIT_CHARS)
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{
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/* check if char maps back to the same Unicode value */
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if (ch & 0xff00)
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{
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unsigned char off = table->cp2uni_leadbytes[ch >> 8];
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return (table->cp2uni[(off << 8) + (ch & 0xff)] == wch);
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}
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return (table->cp2uni[ch & 0xff] == wch);
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}
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return 1;
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}
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/* query necessary dst length for src string */
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static int get_length_dbcs( const struct dbcs_table *table, int flags,
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const WCHAR *src, unsigned int srclen,
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const char *defchar, int *used )
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{
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const unsigned short * const uni2cp_low = table->uni2cp_low;
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const unsigned short * const uni2cp_high = table->uni2cp_high;
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WCHAR defchar_value = table->info.def_char;
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WCHAR composed;
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int len, tmp;
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if (!defchar && !used && !(flags & WC_COMPOSITECHECK))
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{
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for (len = 0; srclen; srclen--, src++, len++)
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{
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if (uni2cp_low[uni2cp_high[*src >> 8] + (*src & 0xff)] & 0xff00) len++;
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}
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return len;
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}
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if (defchar) defchar_value = defchar[1] ? ((defchar[0] << 8) | defchar[1]) : defchar[0];
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if (!used) used = &tmp; /* avoid checking on every char */
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*used = 0;
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for (len = 0; srclen; len++, srclen--, src++)
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{
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unsigned short res;
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WCHAR wch = *src;
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if ((flags & WC_COMPOSITECHECK) && (srclen > 1) && (composed = compose(src)))
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{
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/* now check if we can use the composed char */
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res = uni2cp_low[uni2cp_high[composed >> 8] + (composed & 0xff)];
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if (is_valid_dbcs_mapping( table, flags, composed, res ))
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{
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/* we have a good mapping for the composed char, use it */
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if (res & 0xff00) len++;
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src++;
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srclen--;
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continue;
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}
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/* no mapping for the composed char, check the other flags */
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if (flags & WC_DEFAULTCHAR) /* use the default char instead */
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{
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if (defchar_value & 0xff00) len++;
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*used = 1;
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src++; /* skip the non-spacing char */
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srclen--;
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continue;
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}
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if (flags & WC_DISCARDNS) /* skip the second char of the composition */
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{
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src++;
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srclen--;
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}
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/* WC_SEPCHARS is the default */
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}
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res = uni2cp_low[uni2cp_high[wch >> 8] + (wch & 0xff)];
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if (!is_valid_dbcs_mapping( table, flags, wch, res ))
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{
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res = defchar_value;
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*used = 1;
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}
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if (res & 0xff00) len++;
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}
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return len;
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}
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/* wcstombs for double-byte code page */
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static inline int wcstombs_dbcs( const struct dbcs_table *table,
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const WCHAR *src, unsigned int srclen,
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char *dst, unsigned int dstlen )
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{
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const unsigned short * const uni2cp_low = table->uni2cp_low;
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const unsigned short * const uni2cp_high = table->uni2cp_high;
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int len;
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for (len = dstlen; srclen && len; len--, srclen--, src++)
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{
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unsigned short res = uni2cp_low[uni2cp_high[*src >> 8] + (*src & 0xff)];
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if (res & 0xff00)
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{
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if (len == 1) break; /* do not output a partial char */
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len--;
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*dst++ = res >> 8;
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}
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*dst++ = (char)res;
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}
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if (srclen) return -1; /* overflow */
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return dstlen - len;
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}
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/* slow version of wcstombs_dbcs that handles the various flags */
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static int wcstombs_dbcs_slow( const struct dbcs_table *table, int flags,
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const WCHAR *src, unsigned int srclen,
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char *dst, unsigned int dstlen,
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const char *defchar, int *used )
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{
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const unsigned short * const uni2cp_low = table->uni2cp_low;
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const unsigned short * const uni2cp_high = table->uni2cp_high;
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WCHAR defchar_value = table->info.def_char;
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WCHAR composed;
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int len, tmp;
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if (defchar) defchar_value = defchar[1] ? ((defchar[0] << 8) | defchar[1]) : defchar[0];
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if (!used) used = &tmp; /* avoid checking on every char */
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*used = 0;
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for (len = dstlen; srclen && len; len--, srclen--, src++)
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{
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unsigned short res;
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WCHAR wch = *src;
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if ((flags & WC_COMPOSITECHECK) && (srclen > 1) && (composed = compose(src)))
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{
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/* now check if we can use the composed char */
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res = uni2cp_low[uni2cp_high[composed >> 8] + (composed & 0xff)];
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if (is_valid_dbcs_mapping( table, flags, composed, res ))
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{
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/* we have a good mapping for the composed char, use it */
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src++;
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srclen--;
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goto output_char;
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}
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/* no mapping for the composed char, check the other flags */
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if (flags & WC_DEFAULTCHAR) /* use the default char instead */
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{
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res = defchar_value;
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*used = 1;
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src++; /* skip the non-spacing char */
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srclen--;
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goto output_char;
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}
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if (flags & WC_DISCARDNS) /* skip the second char of the composition */
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{
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src++;
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srclen--;
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}
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/* WC_SEPCHARS is the default */
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}
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res = uni2cp_low[uni2cp_high[wch >> 8] + (wch & 0xff)];
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if (!is_valid_dbcs_mapping( table, flags, wch, res ))
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{
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res = defchar_value;
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*used = 1;
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}
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output_char:
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if (res & 0xff00)
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{
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if (len == 1) break; /* do not output a partial char */
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len--;
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*dst++ = res >> 8;
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}
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*dst++ = (char)res;
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}
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if (srclen) return -1; /* overflow */
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return dstlen - len;
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}
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/* wide char to multi byte string conversion */
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/* return -1 on dst buffer overflow */
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int cp_wcstombs( const union cptable *table, int flags,
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const WCHAR *src, int srclen,
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char *dst, int dstlen, const char *defchar, int *used )
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{
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if (table->info.char_size == 1)
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{
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if (flags || defchar || used)
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{
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if (!dstlen) return get_length_sbcs( &table->sbcs, flags, src, srclen, used );
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return wcstombs_sbcs_slow( &table->sbcs, flags, src, srclen,
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dst, dstlen, defchar, used );
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}
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if (!dstlen) return srclen;
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return wcstombs_sbcs( &table->sbcs, src, srclen, dst, dstlen );
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}
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else /* mbcs */
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{
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if (!dstlen) return get_length_dbcs( &table->dbcs, flags, src, srclen, defchar, used );
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if (flags || defchar || used)
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return wcstombs_dbcs_slow( &table->dbcs, flags, src, srclen,
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dst, dstlen, defchar, used );
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return wcstombs_dbcs( &table->dbcs, src, srclen, dst, dstlen );
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}
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}
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