src/libs/iconv/cns11643_4.h

   1 /*
   2  * Copyright (C) 1999-2001 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  * CNS 11643-1992 plane 4
  23  */
  24
  25 /*
  26  * The table has been split into two parts. Each part's entries fit it 16 bits.
  27  * But the combined table would need 17 bits per entry.
  28  */
  29 #include "cns11643_4a.h"
  30 #include "cns11643_4b.h"
  31
  32 static int
  33 cns11643_4_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
  34 {
  35   unsigned char c1 = s[0];
  36   if ((c1 >= 0x21 && c1 <= 0x6e)) {
  37     if (n >= 2) {
  38       unsigned char c2 = s[1];
  39       if (c2 >= 0x21 && c2 < 0x7f) {
  40         unsigned int i = 94 * (c1 - 0x21) + (c2 - 0x21);
  41         ucs4_t wc = 0xfffd;
  42         unsigned short swc;
  43         {
  44           if (i < 2914)
  45             swc = cns11643_4a_2uni_page21[i],
  46             wc = cns11643_4a_2uni_upages[swc>>8] | (swc & 0xff);
  47           else if (i < 7298)
  48             swc = cns11643_4b_2uni_page40[i-2914],
  49             wc = cns11643_4b_2uni_upages[swc>>8] | (swc & 0xff);
  50         }
  51         if (wc != 0xfffd) {
  52           *pwc = wc;
  53           return 2;
  54         }
  55       }
  56       return RET_ILSEQ;
  57     }
  58     return RET_TOOFEW(0);
  59   }
  60   return RET_ILSEQ;
  61 }