release/src/router/libiconv/lib/dec_hanyu.h

   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 }