kc3-lang/libiconv/lib/big5hkscs2004.h

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• Hash : 91f96be0
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  Date : 2021-06-06T11:51:12
  

  Change the license of the library from LGPL 2.0 to LGPL 2.1.
  

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• lib/big5hkscs2004.h

• /*
   * Copyright (C) 1999-2002, 2006, 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/>.
   */
  
  /*
   * BIG5-HKSCS:2004
   */
  
  /*
   * BIG5-HKSCS:2004 can be downloaded from
   *   http://www.info.gov.hk/digital21/eng/hkscs/download.html
   *   http://www.info.gov.hk/digital21/eng/hkscs/index.html
   *
   * It extends BIG5-HKSCS:2001 through 123 characters.
   *
   * It extends BIG5 (without the rows 0xC6..0xC7) through the ranges
   *
   *   0x{87..8D}{40..7E,A1..FE}      880 characters
   *   0x{8E..A0}{40..7E,A1..FE}     2898 characters
   *   0x{C6..C8}{40..7E,A1..FE}      359 characters
   *   0xF9{D6..FE}                    41 characters
   *   0x{FA..FE}{40..7E,A1..FE}      763 characters
   *
   * Note that some HKSCS characters are not contained in Unicode 3.2
   * and are therefore best represented as sequences of Unicode characters:
   *   0x8862  U+00CA U+0304  LATIN CAPITAL LETTER E WITH CIRCUMFLEX AND MACRON
   *   0x8864  U+00CA U+030C  LATIN CAPITAL LETTER E WITH CIRCUMFLEX AND CARON
   *   0x88A3  U+00EA U+0304  LATIN SMALL LETTER E WITH CIRCUMFLEX AND MACRON
   *   0x88A5  U+00EA U+030C  LATIN SMALL LETTER E WITH CIRCUMFLEX AND CARON
   */
  
  #include "hkscs2004.h"
  #include "flushwc.h"
  
  static int
  big5hkscs2004_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, size_t n)
  {
    ucs4_t last_wc = conv->istate;
    if (last_wc) {
      /* Output the buffered character. */
      conv->istate = 0;
      *pwc = last_wc;
      return 0; /* Don't advance the input pointer. */
    } else {
      unsigned char c = *s;
      /* Code set 0 (ASCII) */
      if (c < 0x80)
        return ascii_mbtowc(conv,pwc,s,n);
      /* Code set 1 (BIG5 extended) */
      if (c >= 0xa1 && c < 0xff) {
        if (n < 2)
          return RET_TOOFEW(0);
        {
          unsigned char c2 = s[1];
          if ((c2 >= 0x40 && c2 < 0x7f) || (c2 >= 0xa1 && c2 < 0xff)) {
            if (!((c == 0xc6 && c2 >= 0xa1) || c == 0xc7)) {
              int ret = big5_mbtowc(conv,pwc,s,2);
              if (ret != RET_ILSEQ)
                return ret;
            }
          }
        }
      }
      {
        int ret = hkscs1999_mbtowc(conv,pwc,s,n);
        if (ret != RET_ILSEQ)
          return ret;
      }
      {
        int ret = hkscs2001_mbtowc(conv,pwc,s,n);
        if (ret != RET_ILSEQ)
          return ret;
      }
      {
        int ret = hkscs2004_mbtowc(conv,pwc,s,n);
        if (ret != RET_ILSEQ)
          return ret;
      }
      if (c == 0x88) {
        if (n < 2)
          return RET_TOOFEW(0);
        {
          unsigned char c2 = s[1];
          if (c2 == 0x62 || c2 == 0x64 || c2 == 0xa3 || c2 == 0xa5) {
            /* It's a composed character. */
            ucs4_t wc1 = ((c2 >> 3) << 2) + 0x009a; /* = 0x00ca or 0x00ea */
            ucs4_t wc2 = ((c2 & 6) << 2) + 0x02fc; /* = 0x0304 or 0x030c */
            /* We cannot output two Unicode characters at once. So,
               output the first character and buffer the second one. */
            *pwc = wc1;
            conv->istate = wc2;
            return 2;
          }
        }
      }
      return RET_ILSEQ;
    }
  }
  
  #define big5hkscs2004_flushwc normal_flushwc
  
  static int
  big5hkscs2004_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, size_t n)
  {
    int count = 0;
    unsigned char last = conv->ostate;
  
    if (last) {
      /* last is = 0x66 or = 0xa7. */
      if (wc == 0x0304 || wc == 0x030c) {
        /* Output the combined character. */
        if (n >= 2) {
          r[0] = 0x88;
          r[1] = last + ((wc & 24) >> 2) - 4; /* = 0x62 or 0x64 or 0xa3 or 0xa5 */
          conv->ostate = 0;
          return 2;
        } else
          return RET_TOOSMALL;
      }
  
      /* Output the buffered character. */
      if (n < 2)
        return RET_TOOSMALL;
      r[0] = 0x88;
      r[1] = last;
      r += 2;
      count = 2;
    }
  
    /* Code set 0 (ASCII) */
    if (wc < 0x0080) {
      /* Plain ASCII character. */
      if (n > count) {
        r[0] = (unsigned char) wc;
        conv->ostate = 0;
        return count+1;
      } else
        return RET_TOOSMALL;
    } else {
      unsigned char buf[2];
      int ret;
  
      /* Code set 1 (BIG5 extended) */
      ret = big5_wctomb(conv,buf,wc,2);
      if (ret != RET_ILUNI) {
        if (ret != 2) abort();
        if (!((buf[0] == 0xc6 && buf[1] >= 0xa1) || buf[0] == 0xc7)) {
          if (n >= count+2) {
            r[0] = buf[0];
            r[1] = buf[1];
            conv->ostate = 0;
            return count+2;
          } else
            return RET_TOOSMALL;
        }
      }
      ret = hkscs1999_wctomb(conv,buf,wc,2);
      if (ret != RET_ILUNI) {
        if (ret != 2) abort();
        if ((wc & ~0x0020) == 0x00ca) {
          /* A possible first character of a multi-character sequence. We have to
             buffer it. */
          if (!(buf[0] == 0x88 && (buf[1] == 0x66 || buf[1] == 0xa7))) abort();
          conv->ostate = buf[1]; /* = 0x66 or = 0xa7 */
          return count+0;
        }
        if (n >= count+2) {
          r[0] = buf[0];
          r[1] = buf[1];
          conv->ostate = 0;
          return count+2;
        } else
          return RET_TOOSMALL;
      }
      ret = hkscs2001_wctomb(conv,buf,wc,2);
      if (ret != RET_ILUNI) {
        if (ret != 2) abort();
        if (n >= count+2) {
          r[0] = buf[0];
          r[1] = buf[1];
          conv->ostate = 0;
          return count+2;
        } else
          return RET_TOOSMALL;
      }
      ret = hkscs2004_wctomb(conv,buf,wc,2);
      if (ret != RET_ILUNI) {
        if (ret != 2) abort();
        if (n >= count+2) {
          r[0] = buf[0];
          r[1] = buf[1];
          conv->ostate = 0;
          return count+2;
        } else
          return RET_TOOSMALL;
      }
      return RET_ILUNI;
    }
  }
  
  static int
  big5hkscs2004_reset (conv_t conv, unsigned char *r, size_t n)
  {
    unsigned char last = conv->ostate;
  
    if (last) {
      if (n < 2)
        return RET_TOOSMALL;
      r[0] = 0x88;
      r[1] = last;
      /* conv->ostate = 0; will be done by the caller */
      return 2;
    } else
      return 0;
  }
  

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