kc3-lang/libiconv/lib/gbk.h

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• Author : Bruno Haible
  Date : 2021-06-06 11:51:12
  Hash : 91f96be0
  Message : Change the license of the library from LGPL 2.0 to LGPL 2.1.

• lib/gbk.h

• /*
   * Copyright (C) 1999-2001, 2005, 2008, 2016 Free Software Foundation, Inc.
   * This file is part of the GNU LIBICONV Library.
   *
   * The GNU LIBICONV Library is free software; you can redistribute it
   * and/or modify it under the terms of the GNU Lesser General Public
   * License as published by the Free Software Foundation; either version 2.1
   * of the License, or (at your option) any later version.
   *
   * The GNU LIBICONV Library is distributed in the hope that it will be
   * useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   * Lesser General Public License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with the GNU LIBICONV Library; see the file COPYING.LIB.
   * If not, see <https://www.gnu.org/licenses/>.
   */
  
  /*
   * GBK
   */
  
  /*
   * GBK, as described in Ken Lunde's book, is an extension of GB 2312-1980
   * (shifted by adding 0x8080 to the range 0xA1A1..0xFEFE, as used in EUC-CN).
   * It adds the following ranges:
   *
   * (part of GBK/1)  0xA2A1-0xA2AA  Small Roman numerals
   * GBK/3   0x{81-A0}{40-7E,80-FE}  6080 new characters, all in Unicode
   * GBK/4   0x{AA-FE}{40-7E,80-A0}  8160 new characters, 8080 in Unicode
   * GBK/5   0x{A8-A9}{40-7E,80-A0}  166 new characters, 153 in Unicode
   *
   * Furthermore, all four tables I have looked at
   *   - the CP936 table by Microsoft, found on ftp.unicode.org in 1999,
   *   - the GBK table by Sun, investigated on a Solaris 2.7 machine,
   *   - the GBK tables by CWEX, found in the Big5+ package,
   *   - the GB18030 standard (second printing),
   * agree in the following extensions. (Ken Lunde must have overlooked these
   * differences between GB2312 and GBK. Also, the CWEX tables have additional
   * differences.)
   *
   * 1. Some characters in the GB2312 range are defined differently:
   *
   *     code    GB2312                         GBK
   *    0xA1A4   0x30FB # KATAKANA MIDDLE DOT   0x00B7 # MIDDLE DOT
   *    0xA1AA   0x2015 # HORIZONTAL BAR        0x2014 # EM DASH
   *
   * 2. 19 characters added in the range 0xA6E0-0xA6F5.
   *
   * 3. 4 characters added in the range 0xA8BB-0xA8C0.
   *
   * CP936 as of 1999 was identical to GBK. However, since 1999, Microsoft has
   * added new mappings to CP936...
   */
  
  #include "gbkext1.h"
  #include "gbkext2.h"
  #include "gbkext_inv.h"
  #include "cp936ext.h"
  
  static int
  gbk_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, size_t n)
  {
    unsigned char c = *s;
  
    if (c >= 0x81 && c < 0xff) {
      if (n < 2)
        return RET_TOOFEW(0);
      if (c >= 0xa1 && c <= 0xf7) {
        unsigned char c2 = s[1];
        if (c == 0xa1) {
          if (c2 == 0xa4) {
            *pwc = 0x00b7;
            return 2;
          }
          if (c2 == 0xaa) {
            *pwc = 0x2014;
            return 2;
          }
        }
        if (c2 >= 0xa1 && c2 < 0xff) {
          unsigned char buf[2];
          int ret;
          buf[0] = c-0x80; buf[1] = c2-0x80;
          ret = gb2312_mbtowc(conv,pwc,buf,2);
          if (ret != RET_ILSEQ)
            return ret;
          buf[0] = c; buf[1] = c2;
          ret = cp936ext_mbtowc(conv,pwc,buf,2);
          if (ret != RET_ILSEQ)
            return ret;
        }
      }
      if (c >= 0x81 && c <= 0xa0)
        return gbkext1_mbtowc(conv,pwc,s,2);
      if (c >= 0xa8 && c <= 0xfe)
        return gbkext2_mbtowc(conv,pwc,s,2);
      if (c == 0xa2) {
        unsigned char c2 = s[1];
        if (c2 >= 0xa1 && c2 <= 0xaa) {
          *pwc = 0x2170+(c2-0xa1);
          return 2;
        }
      }
    }
    return RET_ILSEQ;
  }
  
  static int
  gbk_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, size_t n)
  {
    unsigned char buf[2];
    int ret;
  
    if (wc != 0x30fb && wc != 0x2015) {
      ret = gb2312_wctomb(conv,buf,wc,2);
      if (ret != RET_ILUNI) {
        if (ret != 2) abort();
        if (n < 2)
          return RET_TOOSMALL;
        r[0] = buf[0]+0x80;
        r[1] = buf[1]+0x80;
        return 2;
      }
    }
    ret = gbkext_inv_wctomb(conv,buf,wc,2);
    if (ret != RET_ILUNI) {
      if (ret != 2) abort();
      if (n < 2)
        return RET_TOOSMALL;
      r[0] = buf[0];
      r[1] = buf[1];
      return 2;
    }
    if (wc >= 0x2170 && wc <= 0x2179) {
      if (n < 2)
        return RET_TOOSMALL;
      r[0] = 0xa2;
      r[1] = 0xa1 + (wc-0x2170);
      return 2;
    }
    ret = cp936ext_wctomb(conv,buf,wc,2);
    if (ret != RET_ILUNI) {
      if (ret != 2) abort();
      if (n < 2)
        return RET_TOOSMALL;
      r[0] = buf[0];
      r[1] = buf[1];
      return 2;
    }
    if (wc == 0x00b7) {
      if (n < 2)
        return RET_TOOSMALL;
      r[0] = 0xa1;
      r[1] = 0xa4;
      return 2;
    }
    if (wc == 0x2014) {
      if (n < 2)
        return RET_TOOSMALL;
      r[0] = 0xa1;
      r[1] = 0xaa;
      return 2;
    }
  
    return RET_ILUNI;
  }