text: /**********************************************************************
    utf16_be.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"  /* for USE_CALLOUT */
  
  
  static int
  init(void)
  {
  #ifdef USE_CALLOUT
  
      int id;
      OnigEncoding enc;
      char* name;
      unsigned int args[4];
      OnigValue opts[4];
  
      enc = ONIG_ENCODING_UTF16_BE;
  
      name = "\000F\000A\000I\000L\000\000";            BC0_P(name, fail);
      name = "\000M\000I\000S\000M\000A\000T\000C\000H\000\000"; BC0_P(name, mismatch);
  
      name = "\000M\000A\000X\000\000";
      args[0] = ONIG_TYPE_TAG | ONIG_TYPE_LONG;
      args[1] = ONIG_TYPE_CHAR;
      opts[0].c = 'X';
      BC_B_O(name, max, 2, args, 1, opts);
  
      name = "\000E\000R\000R\000O\000R\000\000";
      args[0] = ONIG_TYPE_LONG; opts[0].l = ONIG_ABORT;
      BC_P_O(name, error, 1, args, 1, opts);
  
      name = "\000C\000O\000U\000N\000T\000\000";
      args[0] = ONIG_TYPE_CHAR; opts[0].c = '>';
      BC_B_O(name, count, 1, args, 1, opts);
  
      name = "\000T\000O\000T\000A\000L\000_\000C\000O\000U\000N\000T\000\000";
      args[0] = ONIG_TYPE_CHAR; opts[0].c = '>';
      BC_B_O(name, total_count, 1, args, 1, opts);
  
      name = "\000C\000M\000P\000\000";
      args[0] = ONIG_TYPE_TAG | ONIG_TYPE_LONG;
      args[1] = ONIG_TYPE_STRING;
      args[2] = ONIG_TYPE_TAG | ONIG_TYPE_LONG;
      BC_P(name, cmp, 3, args);
  
  #endif /* USE_CALLOUT */
  
    return ONIG_NORMAL;
  }
  
  static const int EncLen_UTF16[] = {
    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, 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, 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, 4, 4, 4, 4, 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
  };
  
  static int
  utf16be_mbc_enc_len(const UChar* p)
  {
    return EncLen_UTF16[*p];
  }
  
  static int
  is_valid_mbc_string(const UChar* s, const UChar* end)
  {
    return onigenc_length_check_is_valid_mbc_string(ONIG_ENCODING_UTF16_BE, s, end);
  }
  
  static int
  utf16be_is_mbc_newline(const UChar* p, const UChar* end)
  {
    if (p + 1 < end) {
      if (*(p+1) == 0x0a && *p == 0x00)
        return 1;
  #ifdef USE_UNICODE_ALL_LINE_TERMINATORS
      if ((
  #ifndef USE_CRNL_AS_LINE_TERMINATOR
           *(p+1) == 0x0d ||
  #endif
           *(p+1) == 0x85) && *p == 0x00)
        return 1;
  
      if (*p == 0x20 && (*(p+1) == 0x29 || *(p+1) == 0x28))
        return 1;
  #endif
    }
    return 0;
  }
  
  static OnigCodePoint
  utf16be_mbc_to_code(const UChar* p, const UChar* end ARG_UNUSED)
  {
    OnigCodePoint code;
  
    if (UTF16_IS_SURROGATE_FIRST(*p)) {
      code = ((((p[0] - 0xd8) << 2) + ((p[1] & 0xc0) >> 6) + 1) << 16)
           + ((((p[1] & 0x3f) << 2) + (p[2] - 0xdc)) << 8)
           + p[3];
    }
    else {
      code = p[0] * 256 + p[1];
    }
    return code;
  }
  
  static int
  utf16be_code_to_mbclen(OnigCodePoint code)
  {
    return (code > 0xffff ? 4 : 2);
  }
  
  static int
  utf16be_code_to_mbc(OnigCodePoint code, UChar *buf)
  {
    UChar* p = buf;
  
    if (code > 0xffff) {
      unsigned int plane, high;
  
      plane = (code >> 16) - 1;
      *p++ = (plane >> 2) + 0xd8;
      high = (code & 0xff00) >> 8;
      *p++ = ((plane & 0x03) << 6) + (high >> 2);
      *p++ = (high & 0x03) + 0xdc;
      *p   = (UChar )(code & 0xff);
      return 4;
    }
    else {
      *p++ = (UChar )((code & 0xff00) >> 8);
      *p++ = (UChar )(code & 0xff);
      return 2;
    }
  }
  
  static int
  utf16be_mbc_case_fold(OnigCaseFoldType flag,
  		      const UChar** pp, const UChar* end, UChar* fold)
  {
    const UChar* p = *pp;
  
    if (ONIGENC_IS_ASCII_CODE(*(p+1)) && *p == 0) {
      p++;
  #ifdef USE_UNICODE_CASE_FOLD_TURKISH_AZERI
      if ((flag & ONIGENC_CASE_FOLD_TURKISH_AZERI) != 0) {
        if (*p == 0x49) {
          *fold++ = 0x01;
          *fold   = 0x31;
          (*pp) += 2;
          return 2;
        }
      }
  #endif
  
      *fold++ = 0;
      *fold   = ONIGENC_ASCII_CODE_TO_LOWER_CASE(*p);
      *pp += 2;
      return 2;
    }
    else
      return onigenc_unicode_mbc_case_fold(ONIG_ENCODING_UTF16_BE, flag,
  					 pp, end, fold);
  }
  
  #if 0
  static int
  utf16be_is_mbc_ambiguous(OnigCaseFoldType flag, const UChar** pp, const UChar* end)
  {
    const UChar* p = *pp;
  
    (*pp) += EncLen_UTF16[*p];
  
    if (*p == 0) {
      int c, v;
  
      p++;
      if (*p == 0xdf && (flag & INTERNAL_ONIGENC_CASE_FOLD_MULTI_CHAR) != 0) {
        return TRUE;
      }
  
      c = *p;
      v = ONIGENC_IS_UNICODE_ISO_8859_1_BIT_CTYPE(c,
  		(BIT_CTYPE_UPPER | BIT_CTYPE_LOWER));
  
      if ((v | BIT_CTYPE_LOWER) != 0) {
        /* 0xaa, 0xb5, 0xba are lower case letter, but can't convert. */
        if (c >= 0xaa && c <= 0xba)
          return FALSE;
        else
          return TRUE;
      }
      return (v != 0 ? TRUE : FALSE);
    }
  
    return FALSE;
  }
  #endif
  
  static UChar*
  utf16be_left_adjust_char_head(const UChar* start, const UChar* s)
  {
    if (s <= start) return (UChar* )s;
  
    if ((s - start) % 2 == 1) {
      s--;
    }
  
    if (UTF16_IS_SURROGATE_SECOND(*s) && s > start + 1)
      s -= 2;
  
    return (UChar* )s;
  }
  
  static int
  utf16be_get_case_fold_codes_by_str(OnigCaseFoldType flag,
      const OnigUChar* p, const OnigUChar* end, OnigCaseFoldCodeItem items[])
  {
    return onigenc_unicode_get_case_fold_codes_by_str(ONIG_ENCODING_UTF16_BE,
  						    flag, p, end, items);
  }
  
  OnigEncodingType OnigEncodingUTF16_BE = {
    utf16be_mbc_enc_len,
    "UTF-16BE",   /* name */
    4,            /* max enc length */
    2,            /* min enc length */
    utf16be_is_mbc_newline,
    utf16be_mbc_to_code,
    utf16be_code_to_mbclen,
    utf16be_code_to_mbc,
    utf16be_mbc_case_fold,
    onigenc_unicode_apply_all_case_fold,
    utf16be_get_case_fold_codes_by_str,
    onigenc_unicode_property_name_to_ctype,
    onigenc_unicode_is_code_ctype,
    onigenc_utf16_32_get_ctype_code_range,
    utf16be_left_adjust_char_head,
    onigenc_always_false_is_allowed_reverse_match,
    init,
    0, /* is_initialized */
    is_valid_mbc_string,
    ENC_FLAG_UNICODE|ENC_FLAG_SKIP_OFFSET_2,
    0, 0
  };
  