/**********************************************************************

  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,

  0, 0

};