/* * WideCharToMultiByte 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 WCHAR wine_compose( const WCHAR *str ) DECLSPEC_HIDDEN; /****************************************************************/ /* sbcs support */ /* check if 'ch' is an acceptable sbcs mapping for 'wch' */ static inline int is_valid_sbcs_mapping( const struct sbcs_table *table, int flags, WCHAR wch, unsigned char ch ) { if ((flags & WC_NO_BEST_FIT_CHARS) || ch == (unsigned char)table->info.def_char) return (table->cp2uni[ch] == wch); return 1; } /* query necessary dst length for src string */ static int get_length_sbcs( const struct sbcs_table *table, int flags, const WCHAR *src, unsigned int srclen, int *used ) { const unsigned char * const uni2cp_low = table->uni2cp_low; const unsigned short * const uni2cp_high = table->uni2cp_high; int ret, tmp; WCHAR composed; if (!used) used = &tmp; /* avoid checking on every char */ *used = 0; for (ret = 0; srclen; ret++, src++, srclen--) { WCHAR wch = *src; unsigned char ch; if ((flags & WC_COMPOSITECHECK) && (srclen > 1) && (composed = wine_compose(src))) { /* now check if we can use the composed char */ ch = uni2cp_low[uni2cp_high[composed >> 8] + (composed & 0xff)]; if (is_valid_sbcs_mapping( table, flags, composed, ch )) { /* we have a good mapping, use it */ src++; srclen--; continue; } /* no mapping for the composed char, check the other flags */ if (flags & WC_DEFAULTCHAR) /* use the default char instead */ { *used = 1; src++; /* skip the non-spacing char */ srclen--; continue; } if (flags & WC_DISCARDNS) /* skip the second char of the composition */ { src++; srclen--; } /* WC_SEPCHARS is the default */ } if (!*used) { ch = uni2cp_low[uni2cp_high[wch >> 8] + (wch & 0xff)]; *used = !is_valid_sbcs_mapping( table, flags, wch, ch ); } } return ret; } /* wcstombs for single-byte code page */ static inline int wcstombs_sbcs( const struct sbcs_table *table, const WCHAR *src, unsigned int srclen, char *dst, unsigned int dstlen ) { const unsigned char * const uni2cp_low = table->uni2cp_low; const unsigned short * const uni2cp_high = table->uni2cp_high; int ret = srclen; if (dstlen < srclen) { /* buffer too small: fill it up to dstlen and return error */ srclen = dstlen; ret = -1; } while (srclen >= 16) { dst[0] = uni2cp_low[uni2cp_high[src[0] >> 8] + (src[0] & 0xff)]; dst[1] = uni2cp_low[uni2cp_high[src[1] >> 8] + (src[1] & 0xff)]; dst[2] = uni2cp_low[uni2cp_high[src[2] >> 8] + (src[2] & 0xff)]; dst[3] = uni2cp_low[uni2cp_high[src[3] >> 8] + (src[3] & 0xff)]; dst[4] = uni2cp_low[uni2cp_high[src[4] >> 8] + (src[4] & 0xff)]; dst[5] = uni2cp_low[uni2cp_high[src[5] >> 8] + (src[5] & 0xff)]; dst[6] = uni2cp_low[uni2cp_high[src[6] >> 8] + (src[6] & 0xff)]; dst[7] = uni2cp_low[uni2cp_high[src[7] >> 8] + (src[7] & 0xff)]; dst[8] = uni2cp_low[uni2cp_high[src[8] >> 8] + (src[8] & 0xff)]; dst[9] = uni2cp_low[uni2cp_high[src[9] >> 8] + (src[9] & 0xff)]; dst[10] = uni2cp_low[uni2cp_high[src[10] >> 8] + (src[10] & 0xff)]; dst[11] = uni2cp_low[uni2cp_high[src[11] >> 8] + (src[11] & 0xff)]; dst[12] = uni2cp_low[uni2cp_high[src[12] >> 8] + (src[12] & 0xff)]; dst[13] = uni2cp_low[uni2cp_high[src[13] >> 8] + (src[13] & 0xff)]; dst[14] = uni2cp_low[uni2cp_high[src[14] >> 8] + (src[14] & 0xff)]; dst[15] = uni2cp_low[uni2cp_high[src[15] >> 8] + (src[15] & 0xff)]; src += 16; dst += 16; srclen -= 16; } /* now handle remaining characters */ src += srclen; dst += srclen; switch(srclen) { case 15: dst[-15] = uni2cp_low[uni2cp_high[src[-15] >> 8] + (src[-15] & 0xff)]; case 14: dst[-14] = uni2cp_low[uni2cp_high[src[-14] >> 8] + (src[-14] & 0xff)]; case 13: dst[-13] = uni2cp_low[uni2cp_high[src[-13] >> 8] + (src[-13] & 0xff)]; case 12: dst[-12] = uni2cp_low[uni2cp_high[src[-12] >> 8] + (src[-12] & 0xff)]; case 11: dst[-11] = uni2cp_low[uni2cp_high[src[-11] >> 8] + (src[-11] & 0xff)]; case 10: dst[-10] = uni2cp_low[uni2cp_high[src[-10] >> 8] + (src[-10] & 0xff)]; case 9: dst[-9] = uni2cp_low[uni2cp_high[src[-9] >> 8] + (src[-9] & 0xff)]; case 8: dst[-8] = uni2cp_low[uni2cp_high[src[-8] >> 8] + (src[-8] & 0xff)]; case 7: dst[-7] = uni2cp_low[uni2cp_high[src[-7] >> 8] + (src[-7] & 0xff)]; case 6: dst[-6] = uni2cp_low[uni2cp_high[src[-6] >> 8] + (src[-6] & 0xff)]; case 5: dst[-5] = uni2cp_low[uni2cp_high[src[-5] >> 8] + (src[-5] & 0xff)]; case 4: dst[-4] = uni2cp_low[uni2cp_high[src[-4] >> 8] + (src[-4] & 0xff)]; case 3: dst[-3] = uni2cp_low[uni2cp_high[src[-3] >> 8] + (src[-3] & 0xff)]; case 2: dst[-2] = uni2cp_low[uni2cp_high[src[-2] >> 8] + (src[-2] & 0xff)]; case 1: dst[-1] = uni2cp_low[uni2cp_high[src[-1] >> 8] + (src[-1] & 0xff)]; case 0: break; } return ret; } /* slow version of wcstombs_sbcs that handles the various flags */ static int wcstombs_sbcs_slow( const struct sbcs_table *table, int flags, const WCHAR *src, unsigned int srclen, char *dst, unsigned int dstlen, const char *defchar, int *used ) { const unsigned char * const uni2cp_low = table->uni2cp_low; const unsigned short * const uni2cp_high = table->uni2cp_high; unsigned char def; unsigned int len; int tmp; WCHAR composed; if (!defchar) def = table->info.def_char & 0xff; else def = *defchar; if (!used) used = &tmp; /* avoid checking on every char */ *used = 0; for (len = dstlen; srclen && len; dst++, len--, src++, srclen--) { WCHAR wch = *src; if ((flags & WC_COMPOSITECHECK) && (srclen > 1) && (composed = wine_compose(src))) { /* now check if we can use the composed char */ *dst = uni2cp_low[uni2cp_high[composed >> 8] + (composed & 0xff)]; if (is_valid_sbcs_mapping( table, flags, composed, *dst )) { /* we have a good mapping, use it */ src++; srclen--; continue; } /* no mapping for the composed char, check the other flags */ if (flags & WC_DEFAULTCHAR) /* use the default char instead */ { *dst = def; *used = 1; src++; /* skip the non-spacing char */ srclen--; continue; } if (flags & WC_DISCARDNS) /* skip the second char of the composition */ { src++; srclen--; } /* WC_SEPCHARS is the default */ } *dst = uni2cp_low[uni2cp_high[wch >> 8] + (wch & 0xff)]; if (!is_valid_sbcs_mapping( table, flags, wch, *dst )) { *dst = def; *used = 1; } } if (srclen) return -1; /* overflow */ return dstlen - len; } /****************************************************************/ /* dbcs support */ /* check if 'ch' is an acceptable dbcs mapping for 'wch' */ static inline int is_valid_dbcs_mapping( const struct dbcs_table *table, int flags, WCHAR wch, unsigned short ch ) { if ((flags & WC_NO_BEST_FIT_CHARS) || ch == table->info.def_char) { /* check if char maps back to the same Unicode value */ if (ch & 0xff00) { unsigned char off = table->cp2uni_leadbytes[ch >> 8]; return (table->cp2uni[(off << 8) + (ch & 0xff)] == wch); } return (table->cp2uni[ch & 0xff] == wch); } return 1; } /* compute the default char for the dbcs case */ static inline WCHAR get_defchar_dbcs( const struct dbcs_table *table, const char *defchar ) { if (!defchar) return table->info.def_char; if (!defchar[1]) return (unsigned char)defchar[0]; return ((unsigned char)defchar[0] << 8) | (unsigned char)defchar[1]; } /* query necessary dst length for src string */ static int get_length_dbcs( const struct dbcs_table *table, int flags, const WCHAR *src, unsigned int srclen, const char *defchar, int *used ) { const unsigned short * const uni2cp_low = table->uni2cp_low; const unsigned short * const uni2cp_high = table->uni2cp_high; WCHAR defchar_value, composed; int len, tmp; if (!defchar && !used && !(flags & WC_COMPOSITECHECK)) { for (len = 0; srclen; srclen--, src++, len++) { if (uni2cp_low[uni2cp_high[*src >> 8] + (*src & 0xff)] & 0xff00) len++; } return len; } defchar_value = get_defchar_dbcs( table, defchar ); if (!used) used = &tmp; /* avoid checking on every char */ *used = 0; for (len = 0; srclen; len++, srclen--, src++) { unsigned short res; WCHAR wch = *src; if ((flags & WC_COMPOSITECHECK) && (srclen > 1) && (composed = wine_compose(src))) { /* now check if we can use the composed char */ res = uni2cp_low[uni2cp_high[composed >> 8] + (composed & 0xff)]; if (is_valid_dbcs_mapping( table, flags, composed, res )) { /* we have a good mapping for the composed char, use it */ if (res & 0xff00) len++; src++; srclen--; continue; } /* no mapping for the composed char, check the other flags */ if (flags & WC_DEFAULTCHAR) /* use the default char instead */ { if (defchar_value & 0xff00) len++; *used = 1; src++; /* skip the non-spacing char */ srclen--; continue; } if (flags & WC_DISCARDNS) /* skip the second char of the composition */ { src++; srclen--; } /* WC_SEPCHARS is the default */ } res = uni2cp_low[uni2cp_high[wch >> 8] + (wch & 0xff)]; if (!is_valid_dbcs_mapping( table, flags, wch, res )) { res = defchar_value; *used = 1; } if (res & 0xff00) len++; } return len; } /* wcstombs for double-byte code page */ static inline int wcstombs_dbcs( const struct dbcs_table *table, const WCHAR *src, unsigned int srclen, char *dst, unsigned int dstlen ) { const unsigned short * const uni2cp_low = table->uni2cp_low; const unsigned short * const uni2cp_high = table->uni2cp_high; int len; for (len = dstlen; srclen && len; len--, srclen--, src++) { unsigned short res = uni2cp_low[uni2cp_high[*src >> 8] + (*src & 0xff)]; if (res & 0xff00) { if (len == 1) break; /* do not output a partial char */ len--; *dst++ = res >> 8; } *dst++ = (char)res; } if (srclen) return -1; /* overflow */ return dstlen - len; } /* slow version of wcstombs_dbcs that handles the various flags */ static int wcstombs_dbcs_slow( const struct dbcs_table *table, int flags, const WCHAR *src, unsigned int srclen, char *dst, unsigned int dstlen, const char *defchar, int *used ) { const unsigned short * const uni2cp_low = table->uni2cp_low; const unsigned short * const uni2cp_high = table->uni2cp_high; WCHAR defchar_value = get_defchar_dbcs( table, defchar ); WCHAR composed; int len, tmp; if (!used) used = &tmp; /* avoid checking on every char */ *used = 0; for (len = dstlen; srclen && len; len--, srclen--, src++) { unsigned short res; WCHAR wch = *src; if ((flags & WC_COMPOSITECHECK) && (srclen > 1) && (composed = wine_compose(src))) { /* now check if we can use the composed char */ res = uni2cp_low[uni2cp_high[composed >> 8] + (composed & 0xff)]; if (is_valid_dbcs_mapping( table, flags, composed, res )) { /* we have a good mapping for the composed char, use it */ src++; srclen--; goto output_char; } /* no mapping for the composed char, check the other flags */ if (flags & WC_DEFAULTCHAR) /* use the default char instead */ { res = defchar_value; *used = 1; src++; /* skip the non-spacing char */ srclen--; goto output_char; } if (flags & WC_DISCARDNS) /* skip the second char of the composition */ { src++; srclen--; } /* WC_SEPCHARS is the default */ } res = uni2cp_low[uni2cp_high[wch >> 8] + (wch & 0xff)]; if (!is_valid_dbcs_mapping( table, flags, wch, res )) { res = defchar_value; *used = 1; } output_char: if (res & 0xff00) { if (len == 1) break; /* do not output a partial char */ len--; *dst++ = res >> 8; } *dst++ = (char)res; } if (srclen) return -1; /* overflow */ return dstlen - len; } /* wide char to multi byte string conversion */ /* return -1 on dst buffer overflow */ int wine_cp_wcstombs( const union cptable *table, int flags, const WCHAR *src, int srclen, char *dst, int dstlen, const char *defchar, int *used ) { if (table->info.char_size == 1) { if (flags || defchar || used) { if (!dstlen) return get_length_sbcs( &table->sbcs, flags, src, srclen, used ); return wcstombs_sbcs_slow( &table->sbcs, flags, src, srclen, dst, dstlen, defchar, used ); } if (!dstlen) return srclen; return wcstombs_sbcs( &table->sbcs, src, srclen, dst, dstlen ); } else /* mbcs */ { if (!dstlen) return get_length_dbcs( &table->dbcs, flags, src, srclen, defchar, used ); if (flags || defchar || used) return wcstombs_dbcs_slow( &table->dbcs, flags, src, srclen, dst, dstlen, defchar, used ); return wcstombs_dbcs( &table->dbcs, src, srclen, dst, dstlen ); } }