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

   1 /*
   2  * Copyright (C) 1999-2001, 2005, 2008 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  * GBK
  23  */
  24
  25 /*
  26  * GBK, as described in Ken Lunde's book, is an extension of GB 2312-1980
  27  * (shifted by adding 0x8080 to the range 0xA1A1..0xFEFE, as used in EUC-CN).
  28  * It adds the following ranges:
  29  *
  30  * (part of GBK/1)  0xA2A1-0xA2AA  Small Roman numerals
  31  * GBK/3   0x{81-A0}{40-7E,80-FE}  6080 new characters, all in Unicode
  32  * GBK/4   0x{AA-FE}{40-7E,80-A0}  8160 new characters, 8080 in Unicode
  33  * GBK/5   0x{A8-A9}{40-7E,80-A0}  166 new characters, 153 in Unicode
  34  *
  35  * Furthermore, all four tables I have looked at
  36  *   - the CP936 table by Microsoft, found on ftp.unicode.org in 1999,
  37  *   - the GBK table by Sun, investigated on a Solaris 2.7 machine,
  38  *   - the GBK tables by CWEX, found in the Big5+ package,
  39  *   - the GB18030 standard (second printing),
  40  * agree in the following extensions. (Ken Lunde must have overlooked these
  41  * differences between GB2312 and GBK. Also, the CWEX tables have additional
  42  * differences.)
  43  *
  44  * 1. Some characters in the GB2312 range are defined differently:
  45  *
  46  *     code    GB2312                         GBK
  47  *    0xA1A4   0x30FB # KATAKANA MIDDLE DOT   0x00B7 # MIDDLE DOT
  48  *    0xA1AA   0x2015 # HORIZONTAL BAR        0x2014 # EM DASH
  49  *
  50  * 2. 19 characters added in the range 0xA6E0-0xA6F5.
  51  *
  52  * 3. 4 characters added in the range 0xA8BB-0xA8C0.
  53  *
  54  * CP936 as of 1999 was identical to GBK. However, since 1999, Microsoft has
  55  * added new mappings to CP936...
  56  */
  57
  58 #include "gbkext1.h"
  59 #include "gbkext2.h"
  60 #include "gbkext_inv.h"
  61 #include "cp936ext.h"
  62
  63 static int
  64 gbk_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
  65 {
  66   unsigned char c = *s;
  67
  68   if (c >= 0x81 && c < 0xff) {
  69     if (n < 2)
  70       return RET_TOOFEW(0);
  71     if (c >= 0xa1 && c <= 0xf7) {
  72       unsigned char c2 = s[1];
  73       if (c == 0xa1) {
  74         if (c2 == 0xa4) {
  75           *pwc = 0x00b7;
  76           return 2;
  77         }
  78         if (c2 == 0xaa) {
  79           *pwc = 0x2014;
  80           return 2;
  81         }
  82       }
  83       if (c2 >= 0xa1 && c2 < 0xff) {
  84         unsigned char buf[2];
  85         int ret;
  86         buf[0] = c-0x80; buf[1] = c2-0x80;
  87         ret = gb2312_mbtowc(conv,pwc,buf,2);
  88         if (ret != RET_ILSEQ)
  89           return ret;
  90         buf[0] = c; buf[1] = c2;
  91         ret = cp936ext_mbtowc(conv,pwc,buf,2);
  92         if (ret != RET_ILSEQ)
  93           return ret;
  94       }
  95     }
  96     if (c >= 0x81 && c <= 0xa0)
  97       return gbkext1_mbtowc(conv,pwc,s,2);
  98     if (c >= 0xa8 && c <= 0xfe)
  99       return gbkext2_mbtowc(conv,pwc,s,2);
 100     if (c == 0xa2) {
 101       unsigned char c2 = s[1];
 102       if (c2 >= 0xa1 && c2 <= 0xaa) {
 103         *pwc = 0x2170+(c2-0xa1);
 104         return 2;
 105       }
 106     }
 107   }
 108   return RET_ILSEQ;
 109 }
 110
 111 static int
 112 gbk_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
 113 {
 114   unsigned char buf[2];
 115   int ret;
 116
 117   if (wc != 0x30fb && wc != 0x2015) {
 118     ret = gb2312_wctomb(conv,buf,wc,2);
 119     if (ret != RET_ILUNI) {
 120       if (ret != 2) abort();
 121       if (n < 2)
 122         return RET_TOOSMALL;
 123       r[0] = buf[0]+0x80;
 124       r[1] = buf[1]+0x80;
 125       return 2;
 126     }
 127   }
 128   ret = gbkext_inv_wctomb(conv,buf,wc,2);
 129   if (ret != RET_ILUNI) {
 130     if (ret != 2) abort();
 131     if (n < 2)
 132       return RET_TOOSMALL;
 133     r[0] = buf[0];
 134     r[1] = buf[1];
 135     return 2;
 136   }
 137   if (wc >= 0x2170 && wc <= 0x2179) {
 138     if (n < 2)
 139       return RET_TOOSMALL;
 140     r[0] = 0xa2;
 141     r[1] = 0xa1 + (wc-0x2170);
 142     return 2;
 143   }
 144   ret = cp936ext_wctomb(conv,buf,wc,2);
 145   if (ret != RET_ILUNI) {
 146     if (ret != 2) abort();
 147     if (n < 2)
 148       return RET_TOOSMALL;
 149     r[0] = buf[0];
 150     r[1] = buf[1];
 151     return 2;
 152   }
 153   if (wc == 0x00b7) {
 154     if (n < 2)
 155       return RET_TOOSMALL;
 156     r[0] = 0xa1;
 157     r[1] = 0xa4;
 158     return 2;
 159   }
 160   if (wc == 0x2014) {
 161     if (n < 2)
 162       return RET_TOOSMALL;
 163     r[0] = 0xa1;
 164     r[1] = 0xaa;
 165     return 2;
 166   }
 167
 168   return RET_ILUNI;
 169 }