kc3-lang/libiconv/lib/shift_jisx0213.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/shift_jisx0213.h

• /*
   * Copyright (C) 1999-2002 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/>.
   */
  
  /*
   * SHIFT_JISX0213
   */
  
  /* The structure of Shift_JISX0213 is as follows:
  
     0x00..0x7F: ISO646-JP, an ASCII variant
  
     0x{A1..DF}: JISX0201 Katakana.
  
     0x{81..9F,E0..EF}{40..7E,80..FC}: JISX0213 plane 1.
  
     0x{F0..FC}{40..7E,80..FC}: JISX0213 plane 2, with irregular row mapping.
  
     Note that some JISX0213 characters are not contained in Unicode 3.2
     and are therefore best represented as sequences of Unicode characters.
  */
  
  #include "jisx0213.h"
  #include "flushwc.h"
  
  static int
  shift_jisx0213_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;
      if (c < 0x80) {
        /* Plain ISO646-JP character. */
        if (c == 0x5c)
          *pwc = (ucs4_t) 0x00a5;
        else if (c == 0x7e)
          *pwc = (ucs4_t) 0x203e;
        else
          *pwc = (ucs4_t) c;
        return 1;
      } else if (c >= 0xa1 && c <= 0xdf) {
        *pwc = c + 0xfec0;
        return 1;
      } else {
        if ((c >= 0x81 && c <= 0x9f) || (c >= 0xe0 && c <= 0xfc)) {
          /* Two byte character. */
          if (n >= 2) {
            unsigned char c2 = s[1];
            if ((c2 >= 0x40 && c2 <= 0x7e) || (c2 >= 0x80 && c2 <= 0xfc)) {
              unsigned int c1;
              ucs4_t wc;
              /* Convert to row and column. */
              if (c < 0xe0)
                c -= 0x81;
              else
                c -= 0xc1;
              if (c2 < 0x80)
                c2 -= 0x40;
              else
                c2 -= 0x41;
              /* Now 0 <= c <= 0x3b, 0 <= c2 <= 0xbb. */
              c1 = 2 * c;
              if (c2 >= 0x5e)
                c2 -= 0x5e, c1++;
              c2 += 0x21;
              if (c1 >= 0x5e) {
                /* Handling of JISX 0213 plane 2 rows. */
                if (c1 >= 0x67)
                  c1 += 230;
                else if (c1 >= 0x63 || c1 == 0x5f)
                  c1 += 168;
                else
                  c1 += 162;
              }
              wc = jisx0213_to_ucs4(0x121+c1,c2);
              if (wc) {
                if (wc < 0x80) {
                  /* It's a combining character. */
                  ucs4_t wc1 = jisx0213_to_ucs_combining[wc - 1][0];
                  ucs4_t wc2 = jisx0213_to_ucs_combining[wc - 1][1];
                  /* We cannot output two Unicode characters at once. So,
                     output the first character and buffer the second one. */
                  *pwc = wc1;
                  conv->istate = wc2;
                } else
                  *pwc = wc;
                return 2;
              }
            }
          } else
            return RET_TOOFEW(0);
        }
        return RET_ILSEQ;
      }
    }
  }
  
  #define shift_jisx0213_flushwc normal_flushwc
  
  /* Composition tables for each of the relevant combining characters.  */
  static const struct { unsigned short base; unsigned short composed; } shift_jisx0213_comp_table_data[] = {
  #define shift_jisx0213_comp_table02e5_idx 0
  #define shift_jisx0213_comp_table02e5_len 1
    { 0x8684, 0x8685 }, /* 0x12B65 = 0x12B64 U+02E5 */
  #define shift_jisx0213_comp_table02e9_idx (shift_jisx0213_comp_table02e5_idx+shift_jisx0213_comp_table02e5_len)
  #define shift_jisx0213_comp_table02e9_len 1
    { 0x8680, 0x8686 }, /* 0x12B66 = 0x12B60 U+02E9 */
  #define shift_jisx0213_comp_table0300_idx (shift_jisx0213_comp_table02e9_idx+shift_jisx0213_comp_table02e9_len)
  #define shift_jisx0213_comp_table0300_len 5
    { 0x857b, 0x8663 }, /* 0x12B44 = 0x1295C U+0300 */
    { 0x8657, 0x8667 }, /* 0x12B48 = 0x12B38 U+0300 */
    { 0x8656, 0x8669 }, /* 0x12B4A = 0x12B37 U+0300 */
    { 0x864f, 0x866b }, /* 0x12B4C = 0x12B30 U+0300 */
    { 0x8662, 0x866d }, /* 0x12B4E = 0x12B43 U+0300 */
  #define shift_jisx0213_comp_table0301_idx (shift_jisx0213_comp_table0300_idx+shift_jisx0213_comp_table0300_len)
  #define shift_jisx0213_comp_table0301_len 4
    { 0x8657, 0x8668 }, /* 0x12B49 = 0x12B38 U+0301 */
    { 0x8656, 0x866a }, /* 0x12B4B = 0x12B37 U+0301 */
    { 0x864f, 0x866c }, /* 0x12B4D = 0x12B30 U+0301 */
    { 0x8662, 0x866e }, /* 0x12B4F = 0x12B43 U+0301 */
  #define shift_jisx0213_comp_table309a_idx (shift_jisx0213_comp_table0301_idx+shift_jisx0213_comp_table0301_len)
  #define shift_jisx0213_comp_table309a_len 14
    { 0x82a9, 0x82f5 }, /* 0x12477 = 0x1242B U+309A */
    { 0x82ab, 0x82f6 }, /* 0x12478 = 0x1242D U+309A */
    { 0x82ad, 0x82f7 }, /* 0x12479 = 0x1242F U+309A */
    { 0x82af, 0x82f8 }, /* 0x1247A = 0x12431 U+309A */
    { 0x82b1, 0x82f9 }, /* 0x1247B = 0x12433 U+309A */
    { 0x834a, 0x8397 }, /* 0x12577 = 0x1252B U+309A */
    { 0x834c, 0x8398 }, /* 0x12578 = 0x1252D U+309A */
    { 0x834e, 0x8399 }, /* 0x12579 = 0x1252F U+309A */
    { 0x8350, 0x839a }, /* 0x1257A = 0x12531 U+309A */
    { 0x8352, 0x839b }, /* 0x1257B = 0x12533 U+309A */
    { 0x835a, 0x839c }, /* 0x1257C = 0x1253B U+309A */
    { 0x8363, 0x839d }, /* 0x1257D = 0x12544 U+309A */
    { 0x8367, 0x839e }, /* 0x1257E = 0x12548 U+309A */
    { 0x83f3, 0x83f6 }, /* 0x12678 = 0x12675 U+309A */
  };
  
  static int
  shift_jisx0213_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, size_t n)
  {
    int count = 0;
    unsigned short lasttwo = conv->ostate;
  
    if (lasttwo) {
      /* Attempt to combine the last character with this one. */
      unsigned int idx;
      unsigned int len;
  
      if (wc == 0x02e5)
        idx = shift_jisx0213_comp_table02e5_idx,
        len = shift_jisx0213_comp_table02e5_len;
      else if (wc == 0x02e9)
        idx = shift_jisx0213_comp_table02e9_idx,
        len = shift_jisx0213_comp_table02e9_len;
      else if (wc == 0x0300)
        idx = shift_jisx0213_comp_table0300_idx,
        len = shift_jisx0213_comp_table0300_len;
      else if (wc == 0x0301)
        idx = shift_jisx0213_comp_table0301_idx,
        len = shift_jisx0213_comp_table0301_len;
      else if (wc == 0x309a)
        idx = shift_jisx0213_comp_table309a_idx,
        len = shift_jisx0213_comp_table309a_len;
      else
        goto not_combining;
  
      do
        if (shift_jisx0213_comp_table_data[idx].base == lasttwo)
          break;
      while (++idx, --len > 0);
  
      if (len > 0) {
        /* Output the combined character. */
        if (n >= 2) {
          lasttwo = shift_jisx0213_comp_table_data[idx].composed;
          r[0] = (lasttwo >> 8) & 0xff;
          r[1] = lasttwo & 0xff;
          conv->ostate = 0;
          return 2;
        } else
          return RET_TOOSMALL;
      }
  
    not_combining:
      /* Output the buffered character. */
      if (n < 2)
        return RET_TOOSMALL;
      r[0] = (lasttwo >> 8) & 0xff;
      r[1] = lasttwo & 0xff;
      r += 2;
      count = 2;
    }
  
    if (wc < 0x80 && wc != 0x5c && wc != 0x7e) {
      /* Plain ISO646-JP character. */
      if (n > count) {
        r[0] = (unsigned char) wc;
        conv->ostate = 0;
        return count+1;
      } else
        return RET_TOOSMALL;
    } else if (wc == 0x00a5) {
      if (n > count) {
        r[0] = 0x5c;
        conv->ostate = 0;
        return count+1;
      } else
        return RET_TOOSMALL;
    } else if (wc == 0x203e) {
      if (n > count) {
        r[0] = 0x7e;
        conv->ostate = 0;
        return count+1;
      } else
        return RET_TOOSMALL;
    } else if (wc >= 0xff61 && wc <= 0xff9f) {
      /* Half-width katakana. */
      if (n > count) {
        r[0] = wc - 0xfec0;
        conv->ostate = 0;
        return count+1;
      } else
        return RET_TOOSMALL;
    } else {
      unsigned int s1, s2;
      unsigned short jch = ucs4_to_jisx0213(wc);
      if (jch != 0) {
        /* Convert it to shifted representation. */
        s1 = jch >> 8;
        s2 = jch & 0x7f;
        s1 -= 0x21;
        s2 -= 0x21;
        if (s1 >= 0x5e) {
          /* Handling of JISX 0213 plane 2 rows. */
          if (s1 >= 0xcd) /* rows 0x26E..0x27E */
            s1 -= 102;
          else if (s1 >= 0x8b || s1 == 0x87) /* rows 0x228, 0x22C..0x22F */
            s1 -= 40;
          else /* rows 0x221, 0x223..0x225 */
            s1 -= 34;
          /* Now 0x5e <= s1 <= 0x77. */
        }
        if (s1 & 1)
          s2 += 0x5e;
        s1 = s1 >> 1;
        if (s1 < 0x1f)
          s1 += 0x81;
        else
          s1 += 0xc1;
        if (s2 < 0x3f)
          s2 += 0x40;
        else
          s2 += 0x41;
        if (jch & 0x0080) {
          /* A possible match in comp_table_data. We have to buffer it. */
          /* We know it's a JISX 0213 plane 1 character. */
          if (jch & 0x8000) abort();
          conv->ostate = (s1 << 8) | s2;
          return count+0;
        }
        /* Output the shifted representation. */
        if (n >= count+2) {
          r[0] = s1;
          r[1] = s2;
          conv->ostate = 0;
          return count+2;
        } else
          return RET_TOOSMALL;
      }
      return RET_ILUNI;
    }
  }
  
  static int
  shift_jisx0213_reset (conv_t conv, unsigned char *r, size_t n)
  {
    state_t lasttwo = conv->ostate;
  
    if (lasttwo) {
      if (n < 2)
        return RET_TOOSMALL;
      r[0] = (lasttwo >> 8) & 0xff;
      r[1] = lasttwo & 0xff;
      /* conv->ostate = 0; will be done by the caller */
      return 2;
    } else
      return 0;
  }
  

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