thodg/libiconv/lib/iso2022_jpms.h

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  Date : 2018-09-17T18:28:56
  

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• lib/iso2022_jpms.h

• /*
   * Copyright (C) 1999-2001, 2008, 2011-2012, 2016, 2018 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 Library General Public
   * License as published by the Free Software Foundation; either version 2
   * 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
   * Library General Public License for more details.
   *
   * You should have received a copy of the GNU Library General Public
   * License along with the GNU LIBICONV Library; see the file COPYING.LIB.
   * If not, see <https://www.gnu.org/licenses/>.
   */
  
  /*
   * ISO-2022-JP-MS
   * alias CP50221
   *
   * This is an extension of ISO-2022-JP-1 with larger character sets.
   * It uses ESC $ B and ESC $ ( D to denote *extensions* of JIS X 0208 and
   * JIS X 0212, respectively.  This violates the principles of ISO 2022,
   * where
   *   1. character sets to be used by ISO 2022 have to be registered at the
   *      ISO IR registry <https://www.itscj.ipsj.or.jp/ISO-IR/>,
   *   2. different character sets are designated by different escape
   *      sequences.
   * It's a typical instance of the "embrace and extend" strategy by Microsoft
   * <https://en.wikipedia.org/wiki/Embrace,_extend_and_extinguish>.
   */
  
  /*
   * Windows has three encodings CP50220, CP50221, CP50222.
   * The common parts are:
   *   - US-ASCII (0x00..0x7F)
   *   - JIS X 0208 extended by
   *       - one row (0x2D),
   *       - a private use area (rows 0x75..0x7E = U+E000..U+E3AB),
   *     enabled with ESC $ B, disabled with ESC ( B.
   *   - JIS X 0212 extended by
   *       - two rows (0x73..0x74),
   *       - a private use area (rows 0x75..0x7E = U+E3AC..U+E757),
   *     enabled with ESC $ ( D, disabled with ESC ( B.
   * They differ in the handling of JIS X 0201 characters (halfwidth Katakana)
   * in the conversion direction Unicode -> CP5022x:
   *   * CP50220 maps the halfwidth Katakana to fullwidth Katakana characters.
   *   * CP50221 contains the JIS X 0201 halfwidth Katakana characters,
   *     enabled with ESC ( I, disabled with ESC ( B.
   *   * CP50222 contains the JIS X 0201 halfwidth Katakana characters,
   *     enabled with ESC ( J 0x0E, disabled with ESC ( B.
   * In the conversion direction CP5022x -> Unicode, all three operate the same:
   *   - ESC ( I is supported and understood.
   *   - ESC ( J 0x0E is not accepted.  (Tested on Windows XP SP3.)
   * Conclusion:
   *   - CP50222 should not be used, because the multibyte sequence that it
   *     produces cannot be parsed by either of the three encodings.
   *   - CP50221 is preferrable to CP50220, because it can faithfully represent
   *     the halfwidth Katakana characters.
   * We therefore implement CP50221.  As an extension, in the mbtowc conversion
   * direction, we support also ESC ( J 0x0E, just in case.
   */
  
  #include "cp50221_0208_ext.h"
  #include "cp50221_0212_ext.h"
  
  #define ESC 0x1b
  #define SO  0x0e
  #define SI  0x0f
  
  /*
   * The state can be one of the following values.
   */
  #define STATE_ASCII             0  /* Esc ( B */
  #define STATE_JISX0201ROMAN     1  /* Esc ( J */ /* only in mbtowc direction */
  #define STATE_JISX0201KATAKANA  2  /* Esc ( I */
  #define STATE_JISX0208MS        3  /* Esc $ @ or Esc $ B */
  #define STATE_JISX0212MS        4  /* Esc $ ( D */
  
  static int
  iso2022_jpms_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, size_t n)
  {
    state_t state = conv->istate;
    int count = 0;
    unsigned char c;
    for (;;) {
      c = *s;
      if (c == ESC) {
        if (n < count+3)
          goto none;
        if (s[1] == '(') {
          if (s[2] == 'B') {
            state = STATE_ASCII;
            s += 3; count += 3;
            if (n < count+1)
              goto none;
            continue;
          }
          if (s[2] == 'I') {
            state = STATE_JISX0201KATAKANA;
            s += 3; count += 3;
            if (n < count+1)
              goto none;
            continue;
          }
          if (s[2] == 'J') {
            state = STATE_JISX0201ROMAN;
            s += 3; count += 3;
            if (n < count+1)
              goto none;
            continue;
          }
          goto ilseq;
        }
        if (s[1] == '$') {
          if (s[2] == '@' || s[2] == 'B') {
            /* We don't distinguish JIS X 0208-1978 and JIS X 0208-1983. */
            state = STATE_JISX0208MS;
            s += 3; count += 3;
            if (n < count+1)
              goto none;
            continue;
          }
          if (s[2] == '(') {
            if (n < count+4)
              goto none;
            if (s[3] == 'D') {
              state = STATE_JISX0212MS;
              s += 4; count += 4;
              if (n < count+1)
                goto none;
              continue;
            }
          }
          goto ilseq;
        }
        goto ilseq;
      }
      if (c == SO) {
        if (state == STATE_JISX0201ROMAN)
          state = STATE_JISX0201KATAKANA;
        s += 1; count += 1;
        if (n < count+1)
          goto none;
        continue;
      }
      if (c == SI) {
        if (state == STATE_JISX0201KATAKANA)
          state = STATE_JISX0201ROMAN;
        s += 1; count += 1;
        if (n < count+1)
          goto none;
        continue;
      }
      break;
    }
    switch (state) {
      case STATE_ASCII:
        if (c < 0x80) {
          int ret = ascii_mbtowc(conv,pwc,s,1);
          if (ret == RET_ILSEQ)
            goto ilseq;
          if (ret != 1) abort();
          conv->istate = state;
          return count+1;
        } else
          goto ilseq;
      case STATE_JISX0201ROMAN:
        if (c < 0x80) {
          int ret = jisx0201_mbtowc(conv,pwc,s,1);
          if (ret == RET_ILSEQ)
            goto ilseq;
          if (ret != 1) abort();
          conv->istate = state;
          return count+1;
        } else
          goto ilseq;
      case STATE_JISX0201KATAKANA:
        if (c < 0x80) {
          unsigned char buf = c+0x80;
          int ret = jisx0201_mbtowc(conv,pwc,&buf,1);
          if (ret == RET_ILSEQ)
            goto ilseq;
          if (ret != 1) abort();
          conv->istate = state;
          return count+1;
        } else
          goto ilseq;
      case STATE_JISX0208MS:
        if (n < count+2)
          goto none;
        if (s[0] < 0x80 && s[1] < 0x80) {
          int ret;
          if (s[0] < 0x75) {
            if (s[0] == 0x2d) {
              /* Extension of JIS X 0208.  */
              if (s[1] >= 0x21 && s[1] <= 0x79) {
                unsigned char i = (s[1] - 0x21) + 1;
                ret = cp50221_0208_ext_mbtowc(conv,pwc,&i,1);
                if (ret == 1)
                  ret = 2;
              } else
                ret = RET_ILSEQ;
            } else {
              /* JIS X 0208.  */
              ret = jisx0208_mbtowc(conv,pwc,s,2);
            }
          } else {
            /* Extension of JIS X 0208.
               0x{75..7E}{21..8E} maps to U+E000..U+E3AB.
               But some rows maps to characters present in CP932.  */
            if (s[0] <= 0x7e && (s[1] >= 0x21 && s[1] <= 0x7e)) {
              unsigned short wc = 0xfffd;
              if (s[0] >= 0x79 && s[0] <= 0x7c)
                wc = cp932ext_2uni_pageed[(s[0] - 0x79) * 94 + (s[1] - 0x21)];
              if (wc == 0xfffd)
                wc = (s[0] - 0x75) * 94 + (s[1] - 0x21) + 0xe000;
              *pwc = wc;
              ret = 2;
            } else
              ret = RET_ILSEQ;
          }
          if (ret == RET_ILSEQ)
            goto ilseq;
          if (ret != 2) abort();
          conv->istate = state;
          return count+2;
        } else
          goto ilseq;
      case STATE_JISX0212MS:
        if (n < count+2)
          goto none;
        if (s[0] < 0x80 && s[1] < 0x80) {
          int ret;
          if (s[0] < 0x73) {
            /* JIS X 0212.  */
            ret = jisx0212_mbtowc(conv,pwc,s,2);
          } else {
            if (s[0] < 0x75) {
              /* Extension of JIS X 0212.  */
              if (s[1] >= 0x21 && s[1] <= 0x7e) {
                unsigned char i = (s[0] - 0x73) * 94 + (s[1] - 0x21) + 1;
                ret = cp50221_0212_ext_mbtowc(conv,pwc,&i,1);
                if (ret == 1)
                  ret = 2;
              } else
                ret = RET_ILSEQ;
            } else {
              /* Extension of JIS X 0208.
                 0x{75..7E}{21..8E} maps to U+E3AC..U+E757.  */
              if (s[0] <= 0x7e && (s[1] >= 0x21 && s[1] <= 0x7e)) {
                *pwc = (s[0] - 0x75) * 94 + (s[1] - 0x21) + 0xe3ac;
                ret = 2;
              } else
                ret = RET_ILSEQ;
            }
          }
          if (ret == RET_ILSEQ)
            goto ilseq;
          if (ret != 2) abort();
          conv->istate = state;
          return count+2;
        } else
          goto ilseq;
      default: abort();
    }
  
  none:
    conv->istate = state;
    return RET_TOOFEW(count);
  
  ilseq:
    conv->istate = state;
    return RET_SHIFT_ILSEQ(count);
  }
  
  static int
  iso2022_jpms_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, size_t n)
  {
    state_t state = conv->ostate;
    unsigned char buf[2];
    int ret;
  
    /* Try ASCII. */
    ret = ascii_wctomb(conv,buf,wc,1);
    if (ret != RET_ILUNI) {
      if (ret != 1) abort();
      if (buf[0] < 0x80) {
        int count = (state == STATE_ASCII ? 1 : 4);
        if (n < count)
          return RET_TOOSMALL;
        if (state != STATE_ASCII) {
          r[0] = ESC;
          r[1] = '(';
          r[2] = 'B';
          r += 3;
          state = STATE_ASCII;
        }
        r[0] = buf[0];
        conv->ostate = state;
        return count;
      }
    }
  
    /* Try JIS X 0201-1976 Katakana. */
    ret = jisx0201_wctomb(conv,buf,wc,1);
    if (ret != RET_ILUNI) {
      if (ret != 1) abort();
      if (buf[0] >= 0x80) {
        int count = (state == STATE_JISX0201KATAKANA ? 1 : 4);
        if (n < count)
          return RET_TOOSMALL;
        if (state != STATE_JISX0201KATAKANA) {
          r[0] = ESC;
          r[1] = '(';
          r[2] = 'I';
          r += 3;
          state = STATE_JISX0201KATAKANA;
        }
        r[0] = buf[0]-0x80;
        conv->ostate = state;
        return count;
      }
    }
  
    /* Try JIS X 0208-1990, in place of JIS X 0208-1978 and JIS X 0208-1983,
       and the extensions mentioned above.  */
    if (wc >= 0xe000 && wc < 0xe3ac) {
      unsigned short i = wc - 0xe000;
      buf[0] = (i / 94) + 0x75;
      buf[1] = (i % 94) + 0x21;
      ret = 2;
    } else {
      ret = jisx0208_wctomb(conv,buf,wc,2);
      if (ret == RET_ILUNI) {
        /* Extension of JIS X 0208.  */
        unsigned char i;
        ret = cp50221_0208_ext_wctomb(conv,&i,wc,1);
        if (ret == 1) {
          buf[0] = 0x2d;
          buf[1] = i-1 + 0x21;
          ret = 2;
        } else if (wc == 0x663B) {
          buf[0] = 0x7a;
          buf[1] = 0x36;
          ret = 2;
        } else if (wc == 0xffe2) {
          buf[0] = 0x7c;
          buf[1] = 0x7b;
          ret = 2;
        } else if (wc == 0xffe4) {
          buf[0] = 0x7c;
          buf[1] = 0x7c;
          ret = 2;
        }
      }
    }
    if (ret != RET_ILUNI) {
      if (ret != 2) abort();
      if (buf[0] < 0x80 && buf[1] < 0x80) {
        int count = (state == STATE_JISX0208MS ? 2 : 5);
        if (n < count)
          return RET_TOOSMALL;
        if (state != STATE_JISX0208MS) {
          r[0] = ESC;
          r[1] = '$';
          r[2] = 'B';
          r += 3;
          state = STATE_JISX0208MS;
        }
        r[0] = buf[0];
        r[1] = buf[1];
        conv->ostate = state;
        return count;
      }
    }
  
    /* Try JIS X 0212-1990 and the extensions mentioned above. */
    if (wc >= 0xe3ac && wc < 0xe758) {
      unsigned short i = wc - 0xe3ac;
      buf[0] = (i / 94) + 0x75;
      buf[1] = (i % 94) + 0x21;
      ret = 2;
    } else {
      ret = jisx0212_wctomb(conv,buf,wc,2);
      if (ret == RET_ILUNI) {
        /* Extension of JIS X 0212.  */
        unsigned char i;
        ret = cp50221_0212_ext_wctomb(conv,&i,wc,1);
        if (ret == 1) {
          i -= 1;
          buf[0] = (i / 94) + 0x73;
          buf[1] = (i % 94) + 0x21;
          ret = 2;
        }
      }
    }
    if (ret != RET_ILUNI) {
      if (ret != 2) abort();
      if (buf[0] < 0x80 && buf[1] < 0x80) {
        int count = (state == STATE_JISX0212MS ? 2 : 6);
        if (n < count)
          return RET_TOOSMALL;
        if (state != STATE_JISX0212MS) {
          r[0] = ESC;
          r[1] = '$';
          r[2] = '(';
          r[3] = 'D';
          r += 4;
          state = STATE_JISX0212MS;
        }
        r[0] = buf[0];
        r[1] = buf[1];
        conv->ostate = state;
        return count;
      }
    }
  
    return RET_ILUNI;
  }
  
  static int
  iso2022_jpms_reset (conv_t conv, unsigned char *r, size_t n)
  {
    state_t state = conv->ostate;
    if (state != STATE_ASCII) {
      if (n < 3)
        return RET_TOOSMALL;
      r[0] = ESC;
      r[1] = '(';
      r[2] = 'B';
      /* conv->ostate = 0; will be done by the caller */
      return 3;
    } else
      return 0;
  }
  
  #undef STATE_JISX0212MS
  #undef STATE_JISX0208MS
  #undef STATE_JISX0201KATAKANA
  #undef STATE_JISX0201ROMAN
  #undef STATE_ASCII
  

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