lib/dec_hanyu.h

   1 /*
   2  * Copyright (C) 2001, 2005, 2016 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 Lesser General Public
   7  * License as published by the Free Software Foundation; either version 2.1
   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  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with the GNU LIBICONV Library; see the file COPYING.LIB.
  17  * If not, see <https://www.gnu.org/licenses/>.
  18  */
  19
  20 /*
  21  * DEC-HANYU
  22  */
  23
  24 static int
  25 dec_hanyu_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, size_t n)
  26 {
  27   unsigned char c = *s;
  28   /* Code set 0 (ASCII) */
  29   if (c < 0x80)
  30     return ascii_mbtowc(conv,pwc,s,n);
  31   /* Code set 1 (CNS 11643-1992 Plane 1),
  32      Code set 2 (CNS 11643-1992 Plane 2),
  33      Code set 3 (CNS 11643-1992 Plane 3) */
  34   if (c >= 0xa1 && c < 0xff) {
  35     if (n < 2)
  36       return RET_TOOFEW(0);
  37     {
  38       unsigned char c2 = s[1];
  39       if (c == 0xc2 && c2 == 0xcb) {
  40         if (n < 4)
  41           return RET_TOOFEW(0);
  42         if (s[2] >= 0xa1 && s[2] < 0xff && s[3] >= 0xa1 && s[3] < 0xff) {
  43           unsigned char buf[2];
  44           int ret;
  45           buf[0] = s[2]-0x80; buf[1] = s[3]-0x80;
  46           ret = cns11643_3_mbtowc(conv,pwc,buf,2);
  47           if (ret != RET_ILSEQ) {
  48             if (ret != 2) abort();
  49             return 4;
  50           }
  51         }
  52       } else if (c2 >= 0xa1 && c2 < 0xff) {
  53         if (c != 0xc2 || c2 < 0xc2) {
  54           unsigned char buf[2];
  55           buf[0] = c-0x80; buf[1] = c2-0x80;
  56           return cns11643_1_mbtowc(conv,pwc,buf,2);
  57         }
  58       } else if (c2 >= 0x21 && c2 < 0x7f) {
  59         unsigned char buf[2];
  60         buf[0] = c-0x80; buf[1] = c2;
  61         return cns11643_2_mbtowc(conv,pwc,buf,2);
  62       }
  63     }
  64   }
  65   return RET_ILSEQ;
  66 }
  67
  68 static int
  69 dec_hanyu_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, size_t n)
  70 {
  71   unsigned char buf[3];
  72   int ret;
  73
  74   /* Code set 0 (ASCII) */
  75   ret = ascii_wctomb(conv,r,wc,n);
  76   if (ret != RET_ILUNI)
  77     return ret;
  78
  79   ret = cns11643_wctomb(conv,buf,wc,3);
  80   if (ret != RET_ILUNI) {
  81     if (ret != 3) abort();
  82
  83     /* Code set 1 (CNS 11643-1992 Plane 1) */
  84     if (buf[0] == 1 && (buf[1] != 0x42 || buf[2] < 0x42)) {
  85       if (n < 2)
  86         return RET_TOOSMALL;
  87       r[0] = buf[1]+0x80;
  88       r[1] = buf[2]+0x80;
  89       return 2;
  90     }
  91
  92     /* Code set 2 (CNS 11643-1992 Plane 2) */
  93     if (buf[0] == 2) {
  94       if (n < 2)
  95         return RET_TOOSMALL;
  96       r[0] = buf[1]+0x80;
  97       r[1] = buf[2];
  98       return 2;
  99     }
 100
 101     /* Code set 3 (CNS 11643-1992 Plane 3) */
 102     if (buf[0] == 3) {
 103       if (n < 4)
 104         return RET_TOOSMALL;
 105       r[0] = 0xc2;
 106       r[1] = 0xcb;
 107       r[2] = buf[1]+0x80;
 108       r[3] = buf[2]+0x80;
 109       return 4;
 110     }
 111   }
 112
 113   return RET_ILUNI;
 114 }