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libiconv

    1: /*
    2:  * Copyright (C) 1999-2001, 2005, 2007 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:  * CP949 is EUC-KR, extended with UHC (Unified Hangul Code).
   23:  *
   24:  * Some variants of CP949 (in JDK, Windows-2000, ICU) also add:
   25:  *
   26:  * 2. Private area mappings:
   27:  *
   28:  *        code           Unicode
   29:  *    0xC9{A1..FE}   U+E000..U+E05D
   30:  *    0xFE{A1..FE}   U+E05E..U+E0BB
   31:  *
   32:  * We add them too because, although there are backward compatibility problems
   33:  * when a character from a private area is moved to an official Unicode code
   34:  * point, they are useful for some people in practice.
   35:  */
   36: 
   37: #include "uhc_1.h"
   38: #include "uhc_2.h"
   39: 
   40: static int
   41: cp949_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
   42: {
   43:   unsigned char c = *s;
   44:   /* Code set 0 (ASCII) */
   45:   if (c < 0x80)
   46:     return ascii_mbtowc(conv,pwc,s,n);
   47:   /* UHC part 1 */
   48:   if (c >= 0x81 && c <= 0xa0)
   49:     return uhc_1_mbtowc(conv,pwc,s,n);
   50:   if (c >= 0xa1 && c < 0xff) {
   51:     if (n < 2)
   52:       return RET_TOOFEW(0);
   53:     {
   54:       unsigned char c2 = s[1];
   55:       if (c2 < 0xa1)
   56:         /* UHC part 2 */
   57:         return uhc_2_mbtowc(conv,pwc,s,n);
   58:       else if (c2 < 0xff && !(c == 0xa2 && c2 == 0xe8)) {
   59:         /* Code set 1 (KS C 5601-1992, now KS X 1001:1998) */
   60:         unsigned char buf[2];
   61:         int ret;
   62:         buf[0] = c-0x80; buf[1] = c2-0x80;
   63:         ret = ksc5601_mbtowc(conv,pwc,buf,2);
   64:         if (ret != RET_ILSEQ)
   65:           return ret;
   66:         /* User-defined characters */
   67:         if (c == 0xc9) {
   68:           *pwc = 0xe000 + (c2 - 0xa1);
   69:           return 2;
   70:         }
   71:         if (c == 0xfe) {
   72:           *pwc = 0xe05e + (c2 - 0xa1);
   73:           return 2;
   74:         }
   75:       }
   76:     }
   77:   }
   78:   return RET_ILSEQ;
   79: }
   80: 
   81: static int
   82: cp949_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
   83: {
   84:   unsigned char buf[2];
   85:   int ret;
   86: 
   87:   /* Code set 0 (ASCII) */
   88:   ret = ascii_wctomb(conv,r,wc,n);
   89:   if (ret != RET_ILUNI)
   90:     return ret;
   91: 
   92:   /* Code set 1 (KS C 5601-1992, now KS X 1001:1998) */
   93:   if (wc != 0x327e) {
   94:     ret = ksc5601_wctomb(conv,buf,wc,2);
   95:     if (ret != RET_ILUNI) {
   96:       if (ret != 2) abort();
   97:       if (n < 2)
   98:         return RET_TOOSMALL;
   99:       r[0] = buf[0]+0x80;
  100:       r[1] = buf[1]+0x80;
  101:       return 2;
  102:     }
  103:   }
  104: 
  105:   /* UHC */
  106:   if (wc >= 0xac00 && wc < 0xd7a4) {
  107:     if (wc < 0xc8a5)
  108:       return uhc_1_wctomb(conv,r,wc,n);
  109:     else
  110:       return uhc_2_wctomb(conv,r,wc,n);
  111:   }
  112: 
  113:   /* User-defined characters */
  114:   if (wc >= 0xe000 && wc < 0xe0bc) {
  115:     if (n < 2)
  116:       return RET_TOOSMALL;
  117:     if (wc < 0xe05e) {
  118:       r[0] = 0xc9;
  119:       r[1] = wc - 0xe000 + 0xa1;
  120:     } else {
  121:       r[0] = 0xfe;
  122:       r[1] = wc - 0xe05e + 0xa1;
  123:     }
  124:     return 2;
  125:   }
  126: 
  127:   return RET_ILUNI;
  128: }