thodg/libiconv/lib/iso2022_jp1.h

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• Hash : ce4e3740
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  Date : 2001-03-20T20:30:41
  

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• lib/iso2022_jp1.h

• /*
   * Copyright (C) 1999-2000 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, write to the Free Software Foundation, Inc., 59 Temple Place -
   * Suite 330, Boston, MA 02111-1307, USA.
   */
  
  /*
   * ISO-2022-JP-1
   */
  
  /* Specification: RFC 2237 */
  
  #define ESC 0x1b
  
  /*
   * The state can be one of the following values.
   */
  #define STATE_ASCII          0
  #define STATE_JISX0201ROMAN  1
  #define STATE_JISX0208       2
  #define STATE_JISX0212       3
  
  static int
  iso2022_jp1_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int 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] == 'J') {
            state = STATE_JISX0201ROMAN;
            s += 3; count += 3;
            if (n < count+1)
              goto none;
            continue;
          }
          return RET_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_JISX0208;
            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_JISX0212;
              s += 4; count += 4;
              if (n < count+1)
                goto none;
              continue;
            }
          }
          return RET_ILSEQ;
        }
        return RET_ILSEQ;
      }
      break;
    }
    switch (state) {
      case STATE_ASCII:
        if (c < 0x80) {
          int ret = ascii_mbtowc(conv,pwc,s,1);
          if (ret == RET_ILSEQ)
            return RET_ILSEQ;
          if (ret != 1) abort();
          conv->istate = state;
          return count+1;
        } else
          return RET_ILSEQ;
      case STATE_JISX0201ROMAN:
        if (c < 0x80) {
          int ret = jisx0201_mbtowc(conv,pwc,s,1);
          if (ret == RET_ILSEQ)
            return RET_ILSEQ;
          if (ret != 1) abort();
          conv->istate = state;
          return count+1;
        } else
          return RET_ILSEQ;
      case STATE_JISX0208:
        if (n < count+2)
          goto none;
        if (s[0] < 0x80 && s[1] < 0x80) {
          int ret = jisx0208_mbtowc(conv,pwc,s,2);
          if (ret == RET_ILSEQ)
            return RET_ILSEQ;
          if (ret != 2) abort();
          conv->istate = state;
          return count+2;
        } else
          return RET_ILSEQ;
      case STATE_JISX0212:
        if (n < count+2)
          goto none;
        if (s[0] < 0x80 && s[1] < 0x80) {
          int ret = jisx0212_mbtowc(conv,pwc,s,2);
          if (ret == RET_ILSEQ)
            return RET_ILSEQ;
          if (ret != 2) abort();
          conv->istate = state;
          return count+2;
        } else
          return RET_ILSEQ;
      default: abort();
    }
  
  none:
    conv->istate = state;
    return RET_TOOFEW(count);
  }
  
  static int
  iso2022_jp1_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
  {
    state_t state = conv->ostate;
    unsigned char buf[2];
    int ret;
  
    /* Try ASCII. */
    ret = ascii_wctomb(conv,buf,wc,1);
    if (ret != RET_ILSEQ) {
      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 Roman. */
    ret = jisx0201_wctomb(conv,buf,wc,1);
    if (ret != RET_ILSEQ) {
      if (ret != 1) abort();
      if (buf[0] < 0x80) {
        int count = (state == STATE_JISX0201ROMAN ? 1 : 4);
        if (n < count)
          return RET_TOOSMALL;
        if (state != STATE_JISX0201ROMAN) {
          r[0] = ESC;
          r[1] = '(';
          r[2] = 'J';
          r += 3;
          state = STATE_JISX0201ROMAN;
        }
        r[0] = buf[0];
        conv->ostate = state;
        return count;
      }
    }
  
    /* Try JIS X 0208-1990 in place of JIS X 0208-1978 and JIS X 0208-1983. */
    ret = jisx0208_wctomb(conv,buf,wc,2);
    if (ret != RET_ILSEQ) {
      if (ret != 2) abort();
      if (buf[0] < 0x80 && buf[1] < 0x80) {
        int count = (state == STATE_JISX0208 ? 2 : 5);
        if (n < count)
          return RET_TOOSMALL;
        if (state != STATE_JISX0208) {
          r[0] = ESC;
          r[1] = '$';
          r[2] = 'B';
          r += 3;
          state = STATE_JISX0208;
        }
        r[0] = buf[0];
        r[1] = buf[1];
        conv->ostate = state;
        return count;
      }
    }
  
    /* Try JIS X 0212-1990. */
    ret = jisx0212_wctomb(conv,buf,wc,2);
    if (ret != RET_ILSEQ) {
      if (ret != 2) abort();
      if (buf[0] < 0x80 && buf[1] < 0x80) {
        int count = (state == STATE_JISX0212 ? 2 : 6);
        if (n < count)
          return RET_TOOSMALL;
        if (state != STATE_JISX0212) {
          r[0] = ESC;
          r[1] = '$';
          r[2] = '(';
          r[3] = 'D';
          r += 4;
          state = STATE_JISX0212;
        }
        r[0] = buf[0];
        r[1] = buf[1];
        conv->ostate = state;
        return count;
      }
    }
  
    return RET_ILSEQ;
  }
  
  static int
  iso2022_jp1_reset (conv_t conv, unsigned char *r, int 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_JISX0212
  #undef STATE_JISX0208
  #undef STATE_JISX0201ROMAN
  #undef STATE_ASCII
  

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