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libiconv 1.16

    1: /*
    2:  * Copyright (C) 1999-2001, 2005, 2008, 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 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, see <https://www.gnu.org/licenses/>.
   18:  */
   19: 
   20: /*
   21:  * GBK
   22:  */
   23: 
   24: /*
   25:  * GBK, as described in Ken Lunde's book, is an extension of GB 2312-1980
   26:  * (shifted by adding 0x8080 to the range 0xA1A1..0xFEFE, as used in EUC-CN).
   27:  * It adds the following ranges:
   28:  *
   29:  * (part of GBK/1)  0xA2A1-0xA2AA  Small Roman numerals
   30:  * GBK/3   0x{81-A0}{40-7E,80-FE}  6080 new characters, all in Unicode
   31:  * GBK/4   0x{AA-FE}{40-7E,80-A0}  8160 new characters, 8080 in Unicode
   32:  * GBK/5   0x{A8-A9}{40-7E,80-A0}  166 new characters, 153 in Unicode
   33:  *
   34:  * Furthermore, all four tables I have looked at
   35:  *   - the CP936 table by Microsoft, found on ftp.unicode.org in 1999,
   36:  *   - the GBK table by Sun, investigated on a Solaris 2.7 machine,
   37:  *   - the GBK tables by CWEX, found in the Big5+ package,
   38:  *   - the GB18030 standard (second printing),
   39:  * agree in the following extensions. (Ken Lunde must have overlooked these
   40:  * differences between GB2312 and GBK. Also, the CWEX tables have additional
   41:  * differences.)
   42:  *
   43:  * 1. Some characters in the GB2312 range are defined differently:
   44:  *
   45:  *     code    GB2312                         GBK
   46:  *    0xA1A4   0x30FB # KATAKANA MIDDLE DOT   0x00B7 # MIDDLE DOT
   47:  *    0xA1AA   0x2015 # HORIZONTAL BAR        0x2014 # EM DASH
   48:  *
   49:  * 2. 19 characters added in the range 0xA6E0-0xA6F5.
   50:  *
   51:  * 3. 4 characters added in the range 0xA8BB-0xA8C0.
   52:  *
   53:  * CP936 as of 1999 was identical to GBK. However, since 1999, Microsoft has
   54:  * added new mappings to CP936...
   55:  */
   56: 
   57: #include "gbkext1.h"
   58: #include "gbkext2.h"
   59: #include "gbkext_inv.h"
   60: #include "cp936ext.h"
   61: 
   62: static int
   63: gbk_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, size_t n)
   64: {
   65:   unsigned char c = *s;
   66: 
   67:   if (c >= 0x81 && c < 0xff) {
   68:     if (n < 2)
   69:       return RET_TOOFEW(0);
   70:     if (c >= 0xa1 && c <= 0xf7) {
   71:       unsigned char c2 = s[1];
   72:       if (c == 0xa1) {
   73:         if (c2 == 0xa4) {
   74:           *pwc = 0x00b7;
   75:           return 2;
   76:         }
   77:         if (c2 == 0xaa) {
   78:           *pwc = 0x2014;
   79:           return 2;
   80:         }
   81:       }
   82:       if (c2 >= 0xa1 && c2 < 0xff) {
   83:         unsigned char buf[2];
   84:         int ret;
   85:         buf[0] = c-0x80; buf[1] = c2-0x80;
   86:         ret = gb2312_mbtowc(conv,pwc,buf,2);
   87:         if (ret != RET_ILSEQ)
   88:           return ret;
   89:         buf[0] = c; buf[1] = c2;
   90:         ret = cp936ext_mbtowc(conv,pwc,buf,2);
   91:         if (ret != RET_ILSEQ)
   92:           return ret;
   93:       }
   94:     }
   95:     if (c >= 0x81 && c <= 0xa0)
   96:       return gbkext1_mbtowc(conv,pwc,s,2);
   97:     if (c >= 0xa8 && c <= 0xfe)
   98:       return gbkext2_mbtowc(conv,pwc,s,2);
   99:     if (c == 0xa2) {
  100:       unsigned char c2 = s[1];
  101:       if (c2 >= 0xa1 && c2 <= 0xaa) {
  102:         *pwc = 0x2170+(c2-0xa1);
  103:         return 2;
  104:       }
  105:     }
  106:   }
  107:   return RET_ILSEQ;
  108: }
  109: 
  110: static int
  111: gbk_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, size_t n)
  112: {
  113:   unsigned char buf[2];
  114:   int ret;
  115: 
  116:   if (wc != 0x30fb && wc != 0x2015) {
  117:     ret = gb2312_wctomb(conv,buf,wc,2);
  118:     if (ret != RET_ILUNI) {
  119:       if (ret != 2) abort();
  120:       if (n < 2)
  121:         return RET_TOOSMALL;
  122:       r[0] = buf[0]+0x80;
  123:       r[1] = buf[1]+0x80;
  124:       return 2;
  125:     }
  126:   }
  127:   ret = gbkext_inv_wctomb(conv,buf,wc,2);
  128:   if (ret != RET_ILUNI) {
  129:     if (ret != 2) abort();
  130:     if (n < 2)
  131:       return RET_TOOSMALL;
  132:     r[0] = buf[0];
  133:     r[1] = buf[1];
  134:     return 2;
  135:   }
  136:   if (wc >= 0x2170 && wc <= 0x2179) {
  137:     if (n < 2)
  138:       return RET_TOOSMALL;
  139:     r[0] = 0xa2;
  140:     r[1] = 0xa1 + (wc-0x2170);
  141:     return 2;
  142:   }
  143:   ret = cp936ext_wctomb(conv,buf,wc,2);
  144:   if (ret != RET_ILUNI) {
  145:     if (ret != 2) abort();
  146:     if (n < 2)
  147:       return RET_TOOSMALL;
  148:     r[0] = buf[0];
  149:     r[1] = buf[1];
  150:     return 2;
  151:   }
  152:   if (wc == 0x00b7) {
  153:     if (n < 2)
  154:       return RET_TOOSMALL;
  155:     r[0] = 0xa1;
  156:     r[1] = 0xa4;
  157:     return 2;
  158:   }
  159:   if (wc == 0x2014) {
  160:     if (n < 2)
  161:       return RET_TOOSMALL;
  162:     r[0] = 0xa1;
  163:     r[1] = 0xaa;
  164:     return 2;
  165:   }
  166: 
  167:   return RET_ILUNI;
  168: }