thodg/libiconv/lib/iso2022_cn.h

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• Hash : 91f96be0
  Author :
  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/iso2022_cn.h

• /*
   * Copyright (C) 1999-2001, 2008, 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/>.
   */
  
  /*
   * ISO-2022-CN
   */
  
  /* 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
  /*
   * and one of the following values, << 16
   */
  #define STATE3_NONE                   0
  #define STATE3_DESIGNATED_CNS11643_2  1
  
  #define SPLIT_STATE \
    unsigned int state1 = state & 0xff, state2 = (state >> 8) & 0xff, state3 = state >> 16
  #define COMBINE_STATE \
    state = (state3 << 16) | (state2 << 8) | state1
  
  static int
  iso2022_cn_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, size_t 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[2] == '*') {
            if (s[3] == 'H') {
              state3 = STATE3_DESIGNATED_CNS11643_2;
              s += 4; count += 4;
              if (n < count+1)
                goto none;
              continue;
            }
          }
        }
        if (s[1] == 'N') {
          switch (state3) {
            case STATE3_NONE:
              goto 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)
                  goto ilseq;
                if (ret != 2) abort();
                COMBINE_STATE;
                conv->istate = state;
                return count+4;
              } else
                goto ilseq;
            default: abort();
          }
        }
        goto ilseq;
      }
      if (c == SO) {
        if (state2 != STATE2_DESIGNATED_GB2312 && state2 != STATE2_DESIGNATED_CNS11643_1)
          goto 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)
            goto ilseq;
          if (ret != 1) abort();
          if (*pwc == 0x000a || *pwc == 0x000d) {
            state2 = STATE2_NONE; state3 = STATE3_NONE;
          }
          COMBINE_STATE;
          conv->istate = state;
          return count+1;
        } else
          goto ilseq;
      case STATE_TWOBYTE:
        if (n < count+2)
          goto none;
        if (s[0] < 0x80 && s[1] < 0x80) {
          int ret;
          switch (state2) {
            case STATE2_NONE:
              goto 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;
            default: abort();
          }
          if (ret == RET_ILSEQ)
            goto ilseq;
          if (ret != 2) abort();
          COMBINE_STATE;
          conv->istate = state;
          return count+2;
        } else
          goto ilseq;
      default: abort();
    }
  
  none:
    COMBINE_STATE;
    conv->istate = state;
    return RET_TOOFEW(count);
  
  ilseq:
    COMBINE_STATE;
    conv->istate = state;
    return RET_SHIFT_ILSEQ(count);
  }
  
  static int
  iso2022_cn_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, size_t n)
  {
    state_t state = conv->ostate;
    SPLIT_STATE;
    unsigned char buf[3];
    int ret;
  
    /* There is no need to handle Unicode 3.1 tag characters and to look for
       "zh-CN" or "zh-TW" tags, because GB2312 and CNS11643 are disjoint. */
  
    /* Try ASCII. */
    ret = ascii_wctomb(conv,buf,wc,1);
    if (ret != RET_ILUNI) {
      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;
        }
        COMBINE_STATE;
        conv->ostate = state;
        return count;
      }
    }
  
    /* Try GB 2312-1980. */
    ret = gb2312_wctomb(conv,buf,wc,2);
    if (ret != RET_ILUNI) {
      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_ILUNI) {
      if (ret != 3) abort();
  
      /* Try CNS 11643-1992 Plane 1. */
      if (buf[0] == 1 && 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] == 2 && 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;
      }
    }
  
    return RET_ILUNI;
  }
  
  static int
  iso2022_cn_reset (conv_t conv, unsigned char *r, size_t n)
  {
    state_t state = conv->ostate;
    SPLIT_STATE;
    (void)state2;
    (void)state3;
    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 STATE3_DESIGNATED_CNS11643_2
  #undef STATE3_NONE
  #undef STATE2_DESIGNATED_CNS11643_1
  #undef STATE2_DESIGNATED_GB2312
  #undef STATE2_NONE
  #undef STATE_TWOBYTE
  #undef STATE_ASCII
  

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