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

  utf32_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 "regenc.h"

static int

utf32be_mbc_enc_len(const UChar* p ARG_UNUSED)

{

  return 4;

}

static int

is_valid_mbc_string(const UChar* s, const UChar* end)

{

  return onigenc_length_check_is_valid_mbc_string(ONIG_ENCODING_UTF32_BE, s, end);

}

static int

utf32be_is_mbc_newline(const UChar* p, const UChar* end)

{

  if (p + 3 < end) {

    if (*(p+3) == 0x0a && *(p+2) == 0 && *(p+1) == 0 && *p == 0)

      return 1;

#ifdef USE_UNICODE_ALL_LINE_TERMINATORS

    if ((

#ifndef USE_CRNL_AS_LINE_TERMINATOR

         *(p+3) == 0x0d ||

#endif

         *(p+3) == 0x85)

        && *(p+2) == 0 && *(p+1) == 0 && *p == 0x00)

      return 1;

    if (*(p+2) == 0x20 && (*(p+3) == 0x29 || *(p+3) == 0x28)

        && *(p+1) == 0 && *p == 0)

      return 1;

#endif

  }

  return 0;

}

static OnigCodePoint

utf32be_mbc_to_code(const UChar* p, const UChar* end ARG_UNUSED)

{

  return (OnigCodePoint )(((p[0] * 256 + p[1]) * 256 + p[2]) * 256 + p[3]);

}

static int

utf32be_code_to_mbclen(OnigCodePoint code ARG_UNUSED)

{

  return 4;

}

static int

utf32be_code_to_mbc(OnigCodePoint code, UChar *buf)

{

  UChar* p = buf;

  *p++ = (UChar )((code & 0xff000000) >>24);

  *p++ = (UChar )((code & 0xff0000)   >>16);

  *p++ = (UChar )((code & 0xff00)     >> 8);

  *p++ = (UChar ) (code & 0xff);

  return 4;

}

static int

utf32be_mbc_case_fold(OnigCaseFoldType flag,

		      const UChar** pp, const UChar* end, UChar* fold)

{

  const UChar* p = *pp;

  if (ONIGENC_IS_ASCII_CODE(*(p+3)) && *(p+2) == 0 && *(p+1) == 0 && *p == 0) {

    *fold++ = 0;

    *fold++ = 0;

#ifdef USE_UNICODE_CASE_FOLD_TURKISH_AZERI

    if ((flag & ONIGENC_CASE_FOLD_TURKISH_AZERI) != 0) {

      if (*(p+3) == 0x49) {

        *fold++ = 0x01;

        *fold   = 0x31;

        (*pp) += 4;

        return 4;

      }

    }

#endif

    *fold++ = 0;

    *fold   = ONIGENC_ASCII_CODE_TO_LOWER_CASE(*(p+3));

    *pp += 4;

    return 4;

  }

  else

    return onigenc_unicode_mbc_case_fold(ONIG_ENCODING_UTF32_BE, flag, pp, end,

					 fold);

}

#if 0

static int

utf32be_is_mbc_ambiguous(OnigCaseFoldType flag, const UChar** pp, const UChar* end)

{

  const UChar* p = *pp;

  (*pp) += 4;

  if (*(p+2) == 0 && *(p+1) == 0 && *p == 0) {

    int c, v;

    p += 3;

    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*

utf32be_left_adjust_char_head(const UChar* start, const UChar* s)

{

  int rem;

  if (s <= start) return (UChar* )s;

  rem = (s - start) % 4;

  return (UChar* )(s - rem);

}

static int

utf32be_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_UTF32_BE,

						    flag, p, end, items);

}

OnigEncodingType OnigEncodingUTF32_BE = {

  utf32be_mbc_enc_len,

  "UTF-32BE",   /* name */

  4,            /* max enc length */

  4,            /* min enc length */

  utf32be_is_mbc_newline,

  utf32be_mbc_to_code,

  utf32be_code_to_mbclen,

  utf32be_code_to_mbc,

  utf32be_mbc_case_fold,

  onigenc_unicode_apply_all_case_fold,

  utf32be_get_case_fold_codes_by_str,

  onigenc_unicode_property_name_to_ctype,

  onigenc_unicode_is_code_ctype,

  onigenc_utf16_32_get_ctype_code_range,

  utf32be_left_adjust_char_head,

  onigenc_always_false_is_allowed_reverse_match,

  NULL, /* init */

  NULL, /* is_initialized */

  is_valid_mbc_string,

  ENC_FLAG_UNICODE,

  0, 0

};