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Initial revision

    1: /*
    2:  * Copyright (C) 2005 Free Software Foundation, Inc.
    3:  * This file is part of the GNU LIBICONV Library.
    4:  *
    5:  * The GNU LIBICONV Library is free software; you can redistribute it
    6:  * and/or modify it under the terms of the GNU Library General Public
    7:  * License as published by the Free Software Foundation; either version 2
    8:  * of the License, or (at your option) any later version.
    9:  *
   10:  * The GNU LIBICONV Library is distributed in the hope that it will be
   11:  * useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
   12:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   13:  * Library General Public License for more details.
   14:  *
   15:  * You should have received a copy of the GNU Library General Public
   16:  * License along with the GNU LIBICONV Library; see the file COPYING.LIB.
   17:  * If not, write to the Free Software Foundation, Inc., 51 Franklin Street,
   18:  * Fifth Floor, Boston, MA 02110-1301, USA.
   19:  */
   20: 
   21: /*
   22:  * CP936
   23:  */
   24: 
   25: /*
   26:  * The IANA has CP936 as an alias of GBK. But GBK is an official Chinese
   27:  * specification, whereas CP936 is de-facto maintained by Microsoft. And,
   28:  * of course, Microsoft modified CP936 since 1999.
   29:  *
   30:  * The differences from GBK are:
   31:  *
   32:  * 1. A single character:
   33:  *
   34:  *    code   CP936.TXT
   35:  *    0x80   0x20AC # EURO SIGN
   36:  *
   37:  * Some variants of CP936 (in JDK, Windows-2000, ICU) also add:
   38:  *
   39:  * 2. Private area mappings:
   40:  *
   41:  *              code                 Unicode
   42:  *    0x{A1..A2}{40..7E,80..A0}  U+E4C6..U+E585
   43:  *    0x{AA..AF,F8..FE}{A1..FE}  U+E000..U+E4C5
   44:  *
   45:  * We add them too because, although there are backward compatibility problems
   46:  * when a character from a private area is moved to an official Unicode code
   47:  * point, they are useful for some people in practice.
   48:  */
   49: 
   50: static int
   51: cp936_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
   52: {
   53:   /* Try GBK first. */
   54:   {
   55:     int ret = ces_gbk_mbtowc(conv,pwc,s,n);
   56:     if (ret != RET_ILSEQ)
   57:       return ret;
   58:   }
   59:   /* Then handle the additional mappings. */
   60:   {
   61:     unsigned char c = *s;
   62:     if (c == 0x80) {
   63:       *pwc = 0x20ac;
   64:       return 1;
   65:     }
   66:     /* User-defined characters */
   67:     if (c >= 0xa1 && c <= 0xa2) {
   68:       if (n < 2)
   69:         return RET_TOOFEW(0);
   70:       {
   71:         unsigned char c2 = s[1];
   72:         if ((c2 >= 0x40 && c2 < 0x7f) || (c2 >= 0x80 && c2 < 0xa1)) {
   73:           *pwc = 0xe4c6 + 96 * (c - 0xa1) + (c2 - (c2 >= 0x80 ? 0x41 : 0x40));
   74:           return 2;
   75:         }
   76:       }
   77:     } else if ((c >= 0xaa && c < 0xb0) || (c >= 0xf8 && c < 0xff)) {
   78:       if (n < 2)
   79:         return RET_TOOFEW(0);
   80:       {
   81:         unsigned char c2 = s[1];
   82:         if (c2 >= 0xa1 && c2 < 0xff) {
   83:           *pwc = 0xe000 + 94 * (c - (c >= 0xf8 ? 0xf2 : 0xaa)) + (c2 - 0xa1);
   84:           return 2;
   85:         }
   86:       }
   87:     }
   88:   }
   89:   return RET_ILSEQ;
   90: }
   91: 
   92: static int
   93: cp936_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
   94: {
   95:   /* Try GBK first. */
   96:   {
   97:     int ret = ces_gbk_wctomb(conv,r,wc,n);
   98:     if (ret != RET_ILUNI)
   99:       return ret;
  100:   }
  101:   /* Then handle the additional mappings. */
  102:   if (wc >= 0xe000 && wc < 0xe586) {
  103:     /* User-defined characters */
  104:     if (n < 2)
  105:       return RET_TOOFEW(0);
  106:     if (wc < 0xe4c6) {
  107:       unsigned int i = wc - 0xe000;
  108:       unsigned int c1 = i / 94;
  109:       unsigned int c2 = i % 94;
  110:       r[0] = c1 + (c1 < 6 ? 0xaa : 0xf2);
  111:       r[1] = c2 + 0xa1;
  112:       return 2;
  113:     } else {
  114:       unsigned int i = wc - 0xe4c6;
  115:       unsigned int c1 = i / 96;
  116:       unsigned int c2 = i % 96;
  117:       r[0] = c1 + 0xa1;
  118:       r[1] = c2 + (c2 < 0x3f ? 0x40 : 0x41);
  119:       return 2;
  120:     }
  121:   } else if (wc == 0x20ac) {
  122:     r[0] = 0x80;
  123:     return 1;
  124:   }
  125:   return RET_ILUNI;
  126: }