text: /**********************************************************************
    euc_jp.c -  Oniguruma (regular expression library)
  **********************************************************************/
  /*-
   * Copyright (c) 2002-2018  K.Kosako  <sndgk393 AT ybb DOT ne DOT jp>
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   */
  
  #include "regint.h"
  
  #define eucjp_islead(c)    ((UChar )((c) - 0xa1) > 0xfe - 0xa1)
  
  static const int EncLen_EUCJP[] = {
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 3,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
    2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
    2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
    2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
    2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
    2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1
  };
  
  static int
  mbc_enc_len(const UChar* p)
  {
    return EncLen_EUCJP[*p];
  }
  
  static int
  is_valid_mbc_string(const UChar* p, const UChar* end)
  {
    while (p < end) {
      if (*p < 0x80) {
        p++;
      }
      else if (*p > 0xa0) {
        if (*p == 0xff) return FALSE;
        p++;
        if (p >= end) return FALSE;
        if (*p < 0xa1 || *p == 0xff) return FALSE;
        p++;
      }
      else if (*p == 0x8e) {
        p++;
        if (p >= end) return FALSE;
        if (*p < 0xa1 || *p > 0xdf) return FALSE;
        p++;
      }
      else if (*p == 0x8f) {
        p++;
        if (p >= end) return FALSE;
        if (*p < 0xa1 || *p == 0xff) return FALSE;
        p++;
        if (p >= end) return FALSE;
        if (*p < 0xa1 || *p == 0xff) return FALSE;
        p++;
      }
      else
        return FALSE;
    }
  
    return TRUE;
  }
  
  static OnigCodePoint
  mbc_to_code(const UChar* p, const UChar* end)
  {
    int c, i, len;
    OnigCodePoint n;
  
    len = enclen(ONIG_ENCODING_EUC_JP, p);
    n = (OnigCodePoint )*p++;
    if (len == 1) return n;
  
    for (i = 1; i < len; i++) {
      if (p >= end) break;
      c = *p++;
      n <<= 8;  n += c;
    }
    return n;
  }
  
  static int
  code_to_mbclen(OnigCodePoint code)
  {
    if (ONIGENC_IS_CODE_ASCII(code)) return 1;
    else if ((code & 0xff0000) != 0) return 3;
    else if ((code &   0xff00) != 0) return 2;
    else
      return ONIGERR_INVALID_CODE_POINT_VALUE;
  }
  
  #if 0
  static int
  code_to_mbc_first(OnigCodePoint code)
  {
    int first;
  
    if ((code & 0xff0000) != 0) {
      first = (code >> 16) & 0xff;
    }
    else if ((code & 0xff00) != 0) {
      first = (code >> 8) & 0xff;
    }
    else {
      return (int )code;
    }
    return first;
  }
  #endif
  
  static int
  code_to_mbc(OnigCodePoint code, UChar *buf)
  {
    UChar *p = buf;
  
    if ((code & 0xff0000) != 0) *p++ = (UChar )(((code >> 16) & 0xff));
    if ((code &   0xff00) != 0) *p++ = (UChar )(((code >>  8) & 0xff));
    *p++ = (UChar )(code & 0xff);
  
  #if 1
    if (enclen(ONIG_ENCODING_EUC_JP, buf) != (p - buf))
      return ONIGERR_INVALID_CODE_POINT_VALUE;
  #endif
    return (int )(p - buf);
  }
  
  static int
  mbc_case_fold(OnigCaseFoldType flag ARG_UNUSED,
                const UChar** pp, const UChar* end ARG_UNUSED, UChar* lower)
  {
    int len;
    const UChar* p = *pp;
  
    if (ONIGENC_IS_MBC_ASCII(p)) {
      *lower = ONIGENC_ASCII_CODE_TO_LOWER_CASE(*p);
      (*pp)++;
      return 1;
    }
    else {
      int i;
  
      len = enclen(ONIG_ENCODING_EUC_JP, p);
      for (i = 0; i < len; i++) {
        *lower++ = *p++;
      }
      (*pp) += len;
      return len; /* return byte length of converted char to lower */
    }
  }
  
  static UChar*
  left_adjust_char_head(const UChar* start, const UChar* s)
  {
    /* In this encoding
       mb-trail bytes doesn't mix with single bytes.
    */
    const UChar *p;
    int len;
  
    if (s <= start) return (UChar* )s;
    p = s;
  
    while (!eucjp_islead(*p) && p > start) p--;
    len = enclen(ONIG_ENCODING_EUC_JP, p);
    if (p + len > s) return (UChar* )p;
    p += len;
    return (UChar* )(p + ((s - p) & ~1));
  }
  
  static int
  is_allowed_reverse_match(const UChar* s, const UChar* end ARG_UNUSED)
  {
    const UChar c = *s;
    if (c <= 0x7e || c == 0x8e || c == 0x8f)
      return TRUE;
    else
      return FALSE;
  }
  
  
  static const OnigCodePoint CR_Hiragana[] = {
    1,
    0xa4a1, 0xa4f3
  }; /* CR_Hiragana */
  
  static const OnigCodePoint CR_Katakana[] = {
    3,
    0xa5a1, 0xa5f6,
    0xaaa6, 0xaaaf,
    0xaab1, 0xaadd
  }; /* CR_Katakana */
  
  static const OnigCodePoint* PropertyList[] = {
    CR_Hiragana,
    CR_Katakana
  };
  
  static int
  property_name_to_ctype(OnigEncoding enc, UChar* p, UChar* end)
  {
    struct PropertyNameCtype* pc;
    int len = (int )(end - p);
    char q[32];
  
    if (len < sizeof(q) - 1) {
      xmemcpy(q, p, (size_t )len);
      q[len] = '\0';
      pc = onigenc_euc_jp_lookup_property_name(q, len);
      if (pc != 0)
        return pc->ctype;
    }
  
    return ONIGERR_INVALID_CHAR_PROPERTY_NAME;
  }
  
  static int
  is_code_ctype(OnigCodePoint code, unsigned int ctype)
  {
    if (ctype <= ONIGENC_MAX_STD_CTYPE) {
      if (code < 128)
        return ONIGENC_IS_ASCII_CODE_CTYPE(code, ctype);
      else {
        if (CTYPE_IS_WORD_GRAPH_PRINT(ctype)) {
          return (code_to_mbclen(code) > 1 ? TRUE : FALSE);
        }
      }
    }
    else {
      ctype -= (ONIGENC_MAX_STD_CTYPE + 1);
      if (ctype >= (unsigned int )(sizeof(PropertyList)/sizeof(PropertyList[0])))
        return ONIGERR_TYPE_BUG;
  
      return onig_is_in_code_range((UChar* )PropertyList[ctype], code);
    }
  
    return FALSE;
  }
  
  static int
  get_ctype_code_range(OnigCtype ctype, OnigCodePoint* sb_out,
                       const OnigCodePoint* ranges[])
  {
    if (ctype <= ONIGENC_MAX_STD_CTYPE) {
      return ONIG_NO_SUPPORT_CONFIG;
    }
    else {
      *sb_out = 0x80;
  
      ctype -= (ONIGENC_MAX_STD_CTYPE + 1);
      if (ctype >= (OnigCtype )sizeof(PropertyList)/sizeof(PropertyList[0]))
        return ONIGERR_TYPE_BUG;
  
      *ranges = PropertyList[ctype];
      return 0;
    }
  }
  
  
  OnigEncodingType OnigEncodingEUC_JP = {
    mbc_enc_len,
    "EUC-JP",   /* name */
    3,          /* max enc length */
    1,          /* min enc length */
    onigenc_is_mbc_newline_0x0a,
    mbc_to_code,
    code_to_mbclen,
    code_to_mbc,
    mbc_case_fold,
    onigenc_ascii_apply_all_case_fold,
    onigenc_ascii_get_case_fold_codes_by_str,
    property_name_to_ctype,
    is_code_ctype,
    get_ctype_code_range,
    left_adjust_char_head,
    is_allowed_reverse_match,
    NULL, /* init */
    NULL, /* is_initialized */
    is_valid_mbc_string,
    ENC_FLAG_ASCII_COMPATIBLE|ENC_FLAG_SKIP_OFFSET_1_OR_0,
    0, 0
  };
  