thodg/libiconv/lib/iso2022_cnext.h

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  Date : 2001-03-20T20:30:41
  

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• lib/iso2022_cnext.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-CN-EXT
   */
  
  /* Specification: RFC 1922 */
  
  #define ESC 0x1b
  #define SO  0x0e
  #define SI  0x0f
  
  /*
   * The state is composed of one of the following values
   */
  #define STATE_ASCII          0
  #define STATE_TWOBYTE        1
  /*
   * and one of the following values, << 8
   */
  #define STATE2_NONE                   0
  #define STATE2_DESIGNATED_GB2312      1
  #define STATE2_DESIGNATED_CNS11643_1  2
  #define STATE2_DESIGNATED_ISO_IR_165  3
  /*
   * and one of the following values, << 16
   */
  #define STATE3_NONE                   0
  #define STATE3_DESIGNATED_CNS11643_2  1
  /*
   * and one of the following values, << 24
   */
  #define STATE4_NONE                   0
  #define STATE4_DESIGNATED_CNS11643_3  1
  #define STATE4_DESIGNATED_CNS11643_4  2
  #define STATE4_DESIGNATED_CNS11643_5  3
  #define STATE4_DESIGNATED_CNS11643_6  4
  #define STATE4_DESIGNATED_CNS11643_7  5
  
  #define SPLIT_STATE \
    unsigned int state1 = state & 0xff, state2 = (state >> 8) & 0xff, state3 = (state >> 16) & 0xff, state4 = state >> 24
  #define COMBINE_STATE \
    state = (state4 << 24) | (state3 << 16) | (state2 << 8) | state1
  
  static int
  iso2022_cn_ext_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
  {
    state_t state = conv->istate;
    SPLIT_STATE;
    int count = 0;
    unsigned char c;
    for (;;) {
      c = *s;
      if (c == ESC) {
        if (n < count+4)
          goto none;
        if (s[1] == '$') {
          if (s[2] == ')') {
            if (s[3] == 'A') {
              state2 = STATE2_DESIGNATED_GB2312;
              s += 4; count += 4;
              if (n < count+1)
                goto none;
              continue;
            }
            if (s[3] == 'G') {
              state2 = STATE2_DESIGNATED_CNS11643_1;
              s += 4; count += 4;
              if (n < count+1)
                goto none;
              continue;
            }
            if (s[3] == 'E') {
              state2 = STATE2_DESIGNATED_ISO_IR_165;
              s += 4; count += 4;
              if (n < count+1)
                goto none;
              continue;
            }
          }
          if (s[2] == '*') {
            if (s[3] == 'H') {
              state3 = STATE3_DESIGNATED_CNS11643_2;
              s += 4; count += 4;
              if (n < count+1)
                goto none;
              continue;
            }
          }
          if (s[2] == '+') {
            if (s[3] == 'I') {
              state4 = STATE4_DESIGNATED_CNS11643_3;
              s += 4; count += 4;
              if (n < count+1)
                goto none;
              continue;
            }
            if (s[3] == 'J') {
              state4 = STATE4_DESIGNATED_CNS11643_4;
              s += 4; count += 4;
              if (n < count+1)
                goto none;
              continue;
            }
            if (s[3] == 'K') {
              state4 = STATE4_DESIGNATED_CNS11643_5;
              s += 4; count += 4;
              if (n < count+1)
                goto none;
              continue;
            }
            if (s[3] == 'L') {
              state4 = STATE4_DESIGNATED_CNS11643_6;
              s += 4; count += 4;
              if (n < count+1)
                goto none;
              continue;
            }
            if (s[3] == 'M') {
              state4 = STATE4_DESIGNATED_CNS11643_7;
              s += 4; count += 4;
              if (n < count+1)
                goto none;
              continue;
            }
          }
        }
        if (s[1] == 'N') {
          switch (state3) {
            case STATE3_NONE:
              return RET_ILSEQ;
            case STATE3_DESIGNATED_CNS11643_2:
              if (s[2] < 0x80 && s[3] < 0x80) {
                int ret = cns11643_2_mbtowc(conv,pwc,s+2,2);
                if (ret == RET_ILSEQ)
                  return RET_ILSEQ;
                if (ret != 2) abort();
                COMBINE_STATE;
                conv->istate = state;
                return count+4;
              } else
                return RET_ILSEQ;
            default: abort();
          }
        }
        if (s[1] == 'O') {
          switch (state4) {
            case STATE4_NONE:
              return RET_ILSEQ;
            case STATE4_DESIGNATED_CNS11643_3:
              if (s[2] < 0x80 && s[3] < 0x80) {
                int ret = cns11643_3_mbtowc(conv,pwc,s+2,2);
                if (ret == RET_ILSEQ)
                  return RET_ILSEQ;
                if (ret != 2) abort();
                COMBINE_STATE;
                conv->istate = state;
                return count+4;
              } else
                return RET_ILSEQ;
            case STATE4_DESIGNATED_CNS11643_4:
              if (s[2] < 0x80 && s[3] < 0x80) {
                /* We don't have a CNS 11643-4 to Unicode table yet. */
                return RET_ILSEQ;
              } else
                return RET_ILSEQ;
            case STATE4_DESIGNATED_CNS11643_5:
              if (s[2] < 0x80 && s[3] < 0x80) {
                /* We don't have a CNS 11643-5 to Unicode table yet. */
                return RET_ILSEQ;
              } else
                return RET_ILSEQ;
            case STATE4_DESIGNATED_CNS11643_6:
              if (s[2] < 0x80 && s[3] < 0x80) {
                /* We don't have a CNS 11643-6 to Unicode table yet. */
                return RET_ILSEQ;
              } else
                return RET_ILSEQ;
            case STATE4_DESIGNATED_CNS11643_7:
              if (s[2] < 0x80 && s[3] < 0x80) {
                /* We don't have a CNS 11643-7 to Unicode table yet. */
                return RET_ILSEQ;
              } else
                return RET_ILSEQ;
            default: abort();
          }
        }
        return RET_ILSEQ;
      }
      if (c == SO) {
        if (state2 != STATE2_DESIGNATED_GB2312 && state2 != STATE2_DESIGNATED_CNS11643_1 && state2 != STATE2_DESIGNATED_ISO_IR_165)
          return RET_ILSEQ;
        state1 = STATE_TWOBYTE;
        s++; count++;
        if (n < count+1)
          goto none;
        continue;
      }
      if (c == SI) {
        state1 = STATE_ASCII;
        s++; count++;
        if (n < count+1)
          goto none;
        continue;
      }
      break;
    }
    switch (state1) {
      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();
          if (*pwc == 0x000a || *pwc == 0x000d) {
            state2 = STATE2_NONE; state3 = STATE3_NONE; state4 = STATE3_NONE;
          }
          COMBINE_STATE;
          conv->istate = state;
          return count+1;
        } else
          return RET_ILSEQ;
      case STATE_TWOBYTE:
        if (n < count+2)
          goto none;
        if (s[0] < 0x80 && s[1] < 0x80) {
          int ret;
          switch (state2) {
            case STATE2_NONE:
              return RET_ILSEQ;
            case STATE2_DESIGNATED_GB2312:
              ret = gb2312_mbtowc(conv,pwc,s,2); break;
            case STATE2_DESIGNATED_CNS11643_1:
              ret = cns11643_1_mbtowc(conv,pwc,s,2); break;
            case STATE2_DESIGNATED_ISO_IR_165:
              ret = isoir165_mbtowc(conv,pwc,s,2); break;
            default: abort();
          }
          if (ret == RET_ILSEQ)
            return RET_ILSEQ;
          if (ret != 2) abort();
          COMBINE_STATE;
          conv->istate = state;
          return count+2;
        } else
          return RET_ILSEQ;
      default: abort();
    }
  
  none:
    COMBINE_STATE;
    conv->istate = state;
    return RET_TOOFEW(count);
  }
  
  static int
  iso2022_cn_ext_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
  {
    state_t state = conv->ostate;
    SPLIT_STATE;
    unsigned char buf[3];
    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 = (state1 == STATE_ASCII ? 1 : 2);
        if (n < count)
          return RET_TOOSMALL;
        if (state1 != STATE_ASCII) {
          r[0] = SI;
          r += 1;
          state1 = STATE_ASCII;
        }
        r[0] = buf[0];
        if (wc == 0x000a || wc == 0x000d) {
          state2 = STATE2_NONE; state3 = STATE3_NONE; state4 = STATE3_NONE;
        }
        COMBINE_STATE;
        conv->ostate = state;
        return count;
      }
    }
  
    /* Try GB 2312-1980. */
    ret = gb2312_wctomb(conv,buf,wc,2);
    if (ret != RET_ILSEQ) {
      if (ret != 2) abort();
      if (buf[0] < 0x80 && buf[1] < 0x80) {
        int count = (state2 == STATE2_DESIGNATED_GB2312 ? 0 : 4) + (state1 == STATE_TWOBYTE ? 0 : 1) + 2;
        if (n < count)
          return RET_TOOSMALL;
        if (state2 != STATE2_DESIGNATED_GB2312) {
          r[0] = ESC;
          r[1] = '$';
          r[2] = ')';
          r[3] = 'A';
          r += 4;
          state2 = STATE2_DESIGNATED_GB2312;
        }
        if (state1 != STATE_TWOBYTE) {
          r[0] = SO;
          r += 1;
          state1 = STATE_TWOBYTE;
        }
        r[0] = buf[0];
        r[1] = buf[1];
        COMBINE_STATE;
        conv->ostate = state;
        return count;
      }
    }
  
    ret = cns11643_wctomb(conv,buf,wc,3);
    if (ret != RET_ILSEQ) {
      if (ret != 3) abort();
  
      /* Try CNS 11643-1992 Plane 1. */
      if (buf[0] == 0 && buf[1] < 0x80 && buf[2] < 0x80) {
        int count = (state2 == STATE2_DESIGNATED_CNS11643_1 ? 0 : 4) + (state1 == STATE_TWOBYTE ? 0 : 1) + 2;
        if (n < count)
          return RET_TOOSMALL;
        if (state2 != STATE2_DESIGNATED_CNS11643_1) {
          r[0] = ESC;
          r[1] = '$';
          r[2] = ')';
          r[3] = 'G';
          r += 4;
          state2 = STATE2_DESIGNATED_CNS11643_1;
        }
        if (state1 != STATE_TWOBYTE) {
          r[0] = SO;
          r += 1;
          state1 = STATE_TWOBYTE;
        }
        r[0] = buf[1];
        r[1] = buf[2];
        COMBINE_STATE;
        conv->ostate = state;
        return count;
      }
  
      /* Try CNS 11643-1992 Plane 2. */
      if (buf[0] == 1 && buf[1] < 0x80 && buf[2] < 0x80) {
        int count = (state3 == STATE3_DESIGNATED_CNS11643_2 ? 0 : 4) + 4;
        if (n < count)
          return RET_TOOSMALL;
        if (state3 != STATE3_DESIGNATED_CNS11643_2) {
          r[0] = ESC;
          r[1] = '$';
          r[2] = '*';
          r[3] = 'H';
          r += 4;
          state3 = STATE3_DESIGNATED_CNS11643_2;
        }
        r[0] = ESC;
        r[1] = 'N';
        r[2] = buf[1];
        r[3] = buf[2];
        COMBINE_STATE;
        conv->ostate = state;
        return count;
      }
  
      /* Try CNS 11643-1992 Plane 3. */
      if (buf[0] == 2 && buf[1] < 0x80 && buf[2] < 0x80) {
        int count = (state4 == STATE4_DESIGNATED_CNS11643_3 ? 0 : 4) + 4;
        if (n < count)
          return RET_TOOSMALL;
        if (state4 != STATE4_DESIGNATED_CNS11643_3) {
          r[0] = ESC;
          r[1] = '$';
          r[2] = '+';
          r[3] = 'I';
          r += 4;
          state4 = STATE4_DESIGNATED_CNS11643_3;
        }
        r[0] = ESC;
        r[1] = 'O';
        r[2] = buf[1];
        r[3] = buf[2];
        COMBINE_STATE;
        conv->ostate = state;
        return count;
      }
  
      /* No table for CNS 11643-1992 Plane 4 yet. */
  
      /* No table for CNS 11643-1992 Plane 5 yet. */
  
      /* No table for CNS 11643-1992 Plane 6 yet. */
  
      /* No table for CNS 11643-1992 Plane 7 yet. */
  
    }
  
    /* Try ISO-IR-165. */
    ret = isoir165_wctomb(conv,buf,wc,2);
    if (ret != RET_ILSEQ) {
      if (ret != 2) abort();
      if (buf[0] < 0x80 && buf[1] < 0x80) {
        int count = (state2 == STATE2_DESIGNATED_ISO_IR_165 ? 0 : 4) + (state1 == STATE_TWOBYTE ? 0 : 1) + 2;
        if (n < count)
          return RET_TOOSMALL;
        if (state2 != STATE2_DESIGNATED_ISO_IR_165) {
          r[0] = ESC;
          r[1] = '$';
          r[2] = ')';
          r[3] = 'E';
          r += 4;
          state2 = STATE2_DESIGNATED_ISO_IR_165;
        }
        if (state1 != STATE_TWOBYTE) {
          r[0] = SO;
          r += 1;
          state1 = STATE_TWOBYTE;
        }
        r[0] = buf[0];
        r[1] = buf[1];
        COMBINE_STATE;
        conv->ostate = state;
        return count;
      }
    }
  
    return RET_ILSEQ;
  }
  
  static int
  iso2022_cn_ext_reset (conv_t conv, unsigned char *r, int n)
  {
    state_t state = conv->ostate;
    SPLIT_STATE;
    (void)state2;
    (void)state3;
    (void)state4;
    if (state1 != STATE_ASCII) {
      if (n < 1)
        return RET_TOOSMALL;
      r[0] = SI;
      /* conv->ostate = 0; will be done by the caller */
      return 1;
    } else
      return 0;
  }
  
  #undef COMBINE_STATE
  #undef SPLIT_STATE
  #undef STATE4_DESIGNATED_CNS11643_7
  #undef STATE4_DESIGNATED_CNS11643_6
  #undef STATE4_DESIGNATED_CNS11643_5
  #undef STATE4_DESIGNATED_CNS11643_4
  #undef STATE4_DESIGNATED_CNS11643_3
  #undef STATE4_NONE
  #undef STATE3_DESIGNATED_CNS11643_2
  #undef STATE3_NONE
  #undef STATE2_DESIGNATED_ISO_IR_165
  #undef STATE2_DESIGNATED_CNS11643_1
  #undef STATE2_DESIGNATED_GB2312
  #undef STATE2_NONE
  #undef STATE_TWOBYTE
  #undef STATE_ASCII
  

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