thodg/libiconv/src/iso2022_jp2.h

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• Hash : 3af9cd39
  Author :
  Date : 1999-12-31T12:50:49
  

  Import from libiconv-0.3.
  

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• src/iso2022_jp2.h

• 
  /*
   * ISO-2022-JP-2
   */
  
  /* Specification: RFC 1554 */
  /* ESC '(' 'I' for JISX0201 Katakana is an extension not found in RFC 1554 or
     CJK.INF, but implemented in glibc-2.1 and qt-2.0. */
  
  #define ESC 0x1b
  
  /*
   * The state is composed of one of the following values
   */
  #define STATE_ASCII             0
  #define STATE_JISX0201ROMAN     1
  #define STATE_JISX0201KATAKANA  2
  #define STATE_JISX0208          3
  #define STATE_JISX0212          4
  #define STATE_GB2312            5
  #define STATE_KSC5601           6
  /*
   * and one of the following values, << 8
   */
  #define STATE_G2_NONE           0
  #define STATE_G2_ISO8859_1      1
  #define STATE_G2_ISO8859_7      2
  
  #define SPLIT_STATE \
    unsigned int state1 = state & 0xff, state2 = state >> 8
  #define COMBINE_STATE \
    state = (state2 << 8) | state1
  
  static int
  iso2022_jp2_mbtowc (conv_t conv, wchar_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+3)
          goto none;
        if (s[1] == '(') {
          if (s[2] == 'B') {
            state1 = STATE_ASCII;
            s += 3; count += 3;
            if (n < count+1)
              goto none;
            continue;
          }
          if (s[2] == 'J') {
            state1 = STATE_JISX0201ROMAN;
            s += 3; count += 3;
            if (n < count+1)
              goto none;
            continue;
          }
          if (s[2] == 'I') {
            state1 = STATE_JISX0201KATAKANA;
            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. */
            state1 = STATE_JISX0208;
            s += 3; count += 3;
            if (n < count+1)
              goto none;
            continue;
          }
          if (s[2] == 'A') {
            state1 = STATE_GB2312;
            s += 3; count += 3;
            if (n < count+1)
              goto none;
            continue;
          }
          if (s[2] == '(') {
            if (n < count+4)
              goto none;
            if (s[3] == 'D') {
              state1 = STATE_JISX0212;
              s += 4; count += 4;
              if (n < count+1)
                goto none;
              continue;
            }
            if (s[3] == 'C') {
              state1 = STATE_KSC5601;
              s += 4; count += 4;
              if (n < count+1)
                goto none;
              continue;
            }
            return RET_ILSEQ;
          }
          return RET_ILSEQ;
        }
        if (s[1] == '.') {
          if (n < count+3)
            goto none;
          if (s[2] == 'A') {
            state2 = STATE_G2_ISO8859_1;
            s += 3; count += 3;
            if (n < count+1)
              goto none;
            continue;
          }
          if (s[2] == 'F') {
            state2 = STATE_G2_ISO8859_7;
            s += 3; count += 3;
            if (n < count+1)
              goto none;
            continue;
          }
          return RET_ILSEQ;
        }
        if (s[1] == 'N') {
          switch (state2) {
            case STATE_G2_NONE:
              return RET_ILSEQ;
            case STATE_G2_ISO8859_1:
              if (s[2] < 0x80) {
                unsigned char buf = s[2]+0x80;
                int ret = iso8859_1_mbtowc(conv,pwc,&buf,1);
                if (ret == RET_ILSEQ)
                  return RET_ILSEQ;
                if (ret != 1) abort();
                COMBINE_STATE;
                conv->istate = state;
                return count+3;
              } else
                return RET_ILSEQ;
            case STATE_G2_ISO8859_7:
              if (s[2] < 0x80) {
                unsigned char buf = s[2]+0x80;
                int ret = iso8859_7_mbtowc(conv,pwc,&buf,1);
                if (ret == RET_ILSEQ)
                  return RET_ILSEQ;
                if (ret != 1) abort();
                COMBINE_STATE;
                conv->istate = state;
                return count+3;
              } else
                return RET_ILSEQ;
            default: abort();
          }
        }
        return RET_ILSEQ;
      }
      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 = STATE_G2_NONE;
          COMBINE_STATE;
          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();
          if (*pwc == 0x000a || *pwc == 0x000d)
            state2 = STATE_G2_NONE;
          COMBINE_STATE;
          conv->istate = state;
          return count+1;
        } else
          return RET_ILSEQ;
      case STATE_JISX0201KATAKANA:
        if (c < 0x80) {
          unsigned char buf = c+0x80;
          int ret = jisx0201_mbtowc(conv,pwc,&buf,1);
          if (ret == RET_ILSEQ)
            return RET_ILSEQ;
          if (ret != 1) abort();
          COMBINE_STATE;
          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();
          COMBINE_STATE;
          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();
          COMBINE_STATE;
          conv->istate = state;
          return count+2;
        } else
          return RET_ILSEQ;
      case STATE_GB2312:
        if (n < count+2)
          goto none;
        if (s[0] < 0x80 && s[1] < 0x80) {
          int ret = gb2312_mbtowc(conv,pwc,s,2);
          if (ret == RET_ILSEQ)
            return RET_ILSEQ;
          if (ret != 2) abort();
          COMBINE_STATE;
          conv->istate = state;
          return count+2;
        } else
          return RET_ILSEQ;
      case STATE_KSC5601:
        if (n < count+2)
          goto none;
        if (s[0] < 0x80 && s[1] < 0x80) {
          int ret = ksc5601_mbtowc(conv,pwc,s,2);
          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_jp2_wctomb (conv_t conv, unsigned char *r, wchar_t wc, int n)
  {
    state_t state = conv->ostate;
    SPLIT_STATE;
    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 = (state1 == STATE_ASCII ? 1 : 4);
        if (n < count)
          return RET_TOOSMALL;
        if (state1 != STATE_ASCII) {
          r[0] = ESC;
          r[1] = '(';
          r[2] = 'B';
          r += 3;
          state1 = STATE_ASCII;
        }
        r[0] = buf[0];
        if (wc == 0x000a || wc == 0x000d)
          state2 = STATE_G2_NONE;
        COMBINE_STATE;
        conv->ostate = state;
        return count;
      }
    }
  
    /* Try ISO-8859-1. */
    ret = iso8859_1_wctomb(conv,buf,wc,1);
    if (ret != RET_ILSEQ) {
      if (ret != 1) abort();
      if (buf[0] >= 0x80) {
        int count = (state2 == STATE_G2_ISO8859_1 ? 3 : 6);
        if (n < count)
          return RET_TOOSMALL;
        if (state2 != STATE_G2_ISO8859_1) {
          r[0] = ESC;
          r[1] = '.';
          r[2] = 'A';
          r += 3;
          state2 = STATE_G2_ISO8859_1;
        }
        r[0] = ESC;
        r[1] = 'N';
        r[2] = buf[0]-0x80;
        COMBINE_STATE;
        conv->ostate = state;
        return count;
      }
    }
  
    /* Try ISO-8859-7. */
    ret = iso8859_7_wctomb(conv,buf,wc,1);
    if (ret != RET_ILSEQ) {
      if (ret != 1) abort();
      if (buf[0] >= 0x80) {
        int count = (state2 == STATE_G2_ISO8859_7 ? 3 : 6);
        if (n < count)
          return RET_TOOSMALL;
        if (state2 != STATE_G2_ISO8859_7) {
          r[0] = ESC;
          r[1] = '.';
          r[2] = 'F';
          r += 3;
          state2 = STATE_G2_ISO8859_7;
        }
        r[0] = ESC;
        r[1] = 'N';
        r[2] = buf[0]-0x80;
        COMBINE_STATE;
        conv->ostate = state;
        return count;
      }
    }
  
    /* Try JIS X 0201-1976 Roman and Kana. */
    ret = jisx0201_wctomb(conv,buf,wc,1);
    if (ret != RET_ILSEQ) {
      if (ret != 1) abort();
      if (buf[0] < 0x80) {
        int count = (state1 == STATE_JISX0201ROMAN ? 1 : 4);
        if (n < count)
          return RET_TOOSMALL;
        if (state1 != STATE_JISX0201ROMAN) {
          r[0] = ESC;
          r[1] = '(';
          r[2] = 'J';
          r += 3;
          state1 = STATE_JISX0201ROMAN;
        }
        r[0] = buf[0];
        if (wc == 0x000a || wc == 0x000d)
          state2 = STATE_G2_NONE;
        COMBINE_STATE;
        conv->ostate = state;
        return count;
      } else {
        int count = (state1 == STATE_JISX0201KATAKANA ? 1 : 4);
        if (n < count)
          return RET_TOOSMALL;
        if (state1 != STATE_JISX0201KATAKANA) {
          r[0] = ESC;
          r[1] = '(';
          r[2] = 'I';
          r += 3;
          state1 = STATE_JISX0201KATAKANA;
        }
        r[0] = buf[0]-0x80;
        COMBINE_STATE;
        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 = (state1 == STATE_JISX0208 ? 2 : 5);
        if (n < count)
          return RET_TOOSMALL;
        if (state1 != STATE_JISX0208) {
          r[0] = ESC;
          r[1] = '$';
          r[2] = 'B';
          r += 3;
          state1 = STATE_JISX0208;
        }
        r[0] = buf[0];
        r[1] = buf[1];
        COMBINE_STATE;
        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 = (state1 == STATE_JISX0212 ? 2 : 6);
        if (n < count)
          return RET_TOOSMALL;
        if (state1 != STATE_JISX0212) {
          r[0] = ESC;
          r[1] = '$';
          r[2] = '(';
          r[3] = 'D';
          r += 4;
          state1 = STATE_JISX0212;
        }
        r[0] = buf[0];
        r[1] = buf[1];
        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 = (state1 == STATE_GB2312 ? 2 : 5);
        if (n < count)
          return RET_TOOSMALL;
        if (state1 != STATE_GB2312) {
          r[0] = ESC;
          r[1] = '$';
          r[2] = 'A';
          r += 3;
          state1 = STATE_GB2312;
        }
        r[0] = buf[0];
        r[1] = buf[1];
        COMBINE_STATE;
        conv->ostate = state;
        return count;
      }
    }
  
    /* Try KS C 5601-1992. */
    ret = ksc5601_wctomb(conv,buf,wc,2);
    if (ret != RET_ILSEQ) {
      if (ret != 2) abort();
      if (buf[0] < 0x80 && buf[1] < 0x80) {
        int count = (state1 == STATE_KSC5601 ? 2 : 6);
        if (n < count)
          return RET_TOOSMALL;
        if (state1 != STATE_KSC5601) {
          r[0] = ESC;
          r[1] = '$';
          r[2] = '(';
          r[3] = 'C';
          r += 4;
          state1 = STATE_KSC5601;
        }
        r[0] = buf[0];
        r[1] = buf[1];
        COMBINE_STATE;
        conv->ostate = state;
        return count;
      }
    }
  
    return RET_ILSEQ;
  }
  
  static int
  iso2022_jp2_reset (conv_t conv, unsigned char *r, int n)
  {
    state_t state = conv->ostate;
    SPLIT_STATE;
    (void)state2;
    if (state1 != 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 COMBINE_STATE
  #undef SPLIT_STATE
  #undef STATE_G2_ISO8859_7
  #undef STATE_G2_ISO8859_1
  #undef STATE_G2_NONE
  #undef STATE_KSC5601
  #undef STATE_GB2312
  #undef STATE_JISX0212
  #undef STATE_JISX0208
  #undef STATE_JISX0201KATAKANA
  #undef STATE_JISX0201ROMAN
  #undef STATE_ASCII
  

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