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libiconv

    1: /*
    2:  * Copyright (C) 2001, 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:  * DEC-HANYU
   23:  */
   24: 
   25: static int
   26: dec_hanyu_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
   27: {
   28:   unsigned char c = *s;
   29:   /* Code set 0 (ASCII) */
   30:   if (c < 0x80)
   31:     return ascii_mbtowc(conv,pwc,s,n);
   32:   /* Code set 1 (CNS 11643-1992 Plane 1),
   33:      Code set 2 (CNS 11643-1992 Plane 2),
   34:      Code set 3 (CNS 11643-1992 Plane 3) */
   35:   if (c >= 0xa1 && c < 0xff) {
   36:     if (n < 2)
   37:       return RET_TOOFEW(0);
   38:     {
   39:       unsigned char c2 = s[1];
   40:       if (c == 0xc2 && c2 == 0xcb) {
   41:         if (n < 4)
   42:           return RET_TOOFEW(0);
   43:         if (s[2] >= 0xa1 && s[2] < 0xff && s[3] >= 0xa1 && s[3] < 0xff) {
   44:           unsigned char buf[2];
   45:           int ret;
   46:           buf[0] = s[2]-0x80; buf[1] = s[3]-0x80;
   47:           ret = cns11643_3_mbtowc(conv,pwc,buf,2);
   48:           if (ret != RET_ILSEQ) {
   49:             if (ret != 2) abort();
   50:             return 4;
   51:           }
   52:         }
   53:       } else if (c2 >= 0xa1 && c2 < 0xff) {
   54:         if (c != 0xc2 || c2 < 0xc2) {
   55:           unsigned char buf[2];
   56:           buf[0] = c-0x80; buf[1] = c2-0x80;
   57:           return cns11643_1_mbtowc(conv,pwc,buf,2);
   58:         }
   59:       } else if (c2 >= 0x21 && c2 < 0x7f) {
   60:         unsigned char buf[2];
   61:         buf[0] = c-0x80; buf[1] = c2;
   62:         return cns11643_2_mbtowc(conv,pwc,buf,2);
   63:       }
   64:     }
   65:   }
   66:   return RET_ILSEQ;
   67: }
   68: 
   69: static int
   70: dec_hanyu_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
   71: {
   72:   unsigned char buf[3];
   73:   int ret;
   74: 
   75:   /* Code set 0 (ASCII) */
   76:   ret = ascii_wctomb(conv,r,wc,n);
   77:   if (ret != RET_ILUNI)
   78:     return ret;
   79: 
   80:   ret = cns11643_wctomb(conv,buf,wc,3);
   81:   if (ret != RET_ILUNI) {
   82:     if (ret != 3) abort();
   83: 
   84:     /* Code set 1 (CNS 11643-1992 Plane 1) */
   85:     if (buf[0] == 1 && (buf[1] != 0x42 || buf[2] < 0x42)) {
   86:       if (n < 2)
   87:         return RET_TOOSMALL;
   88:       r[0] = buf[1]+0x80;
   89:       r[1] = buf[2]+0x80;
   90:       return 2;
   91:     }
   92: 
   93:     /* Code set 2 (CNS 11643-1992 Plane 2) */
   94:     if (buf[0] == 2) {
   95:       if (n < 2)
   96:         return RET_TOOSMALL;
   97:       r[0] = buf[1]+0x80;
   98:       r[1] = buf[2];
   99:       return 2;
  100:     }
  101: 
  102:     /* Code set 3 (CNS 11643-1992 Plane 3) */
  103:     if (buf[0] == 3) {
  104:       if (n < 4)
  105:         return RET_TOOSMALL;
  106:       r[0] = 0xc2;
  107:       r[1] = 0xcb;
  108:       r[2] = buf[1]+0x80;
  109:       r[3] = buf[2]+0x80;
  110:       return 4;
  111:     }
  112:   }
  113: 
  114:   return RET_ILUNI;
  115: }