Blame src/euc_tw.c

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/**********************************************************************
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  euc_tw.c -  Oniguruma (regular expression library)
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**********************************************************************/
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/*-
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 * Copyright (c) 2002-2018  K.Kosako  <sndgk393 AT ybb DOT ne DOT jp>
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 * 1. Redistributions of source code must retain the above copyright
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 *    notice, this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *    notice, this list of conditions and the following disclaimer in the
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 *    documentation and/or other materials provided with the distribution.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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 * SUCH DAMAGE.
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 */
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#include "regenc.h"
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static const int EncLen_EUCTW[] = {
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  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 4, 1,
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  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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  1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
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  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
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  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
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  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
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  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
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  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1
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};
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static int
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euctw_mbc_enc_len(const UChar* p)
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{
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  return EncLen_EUCTW[*p];
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}
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static int
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is_valid_mbc_string(const UChar* p, const UChar* end)
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{
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  while (p < end) {
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    if (*p < 0x80) {
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      p++;
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    }
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    else if (*p < 0xa1) {
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      if (*p == 0x8e) {
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	p++;
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	if (p >= end) return FALSE;
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	if (*p < 0xa1 || *p > 0xb0) return FALSE;
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	p++;
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	if (p >= end) return FALSE;
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	if (*p < 0xa1 || *p == 0xff)
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	  return FALSE;
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	p++;
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	if (p >= end) return FALSE;
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	if (*p < 0xa1 || *p == 0xff)
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	  return FALSE;
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	p++;
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      }
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      else
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	return FALSE;
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    }
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    else if (*p < 0xff) {
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      p++;
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      if (p >= end) return FALSE;
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      if (*p < 0xa1 || *p == 0xff)
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	return FALSE;
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      p++;
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    }
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    else
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      return FALSE;
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  }
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  return TRUE;
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}
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static OnigCodePoint
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euctw_mbc_to_code(const UChar* p, const UChar* end)
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{
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  return onigenc_mbn_mbc_to_code(ONIG_ENCODING_EUC_TW, p, end);
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}
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static int
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euctw_code_to_mbc(OnigCodePoint code, UChar *buf)
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{
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  return onigenc_mb4_code_to_mbc(ONIG_ENCODING_EUC_TW, code, buf);
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}
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static int
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euctw_mbc_case_fold(OnigCaseFoldType flag, const UChar** pp, const UChar* end,
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                    UChar* lower)
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{
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  return onigenc_mbn_mbc_case_fold(ONIG_ENCODING_EUC_TW, flag,
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                                   pp, end, lower);
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}
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static int
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euctw_is_code_ctype(OnigCodePoint code, unsigned int ctype)
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{
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  return onigenc_mb4_is_code_ctype(ONIG_ENCODING_EUC_TW, code, ctype);
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}
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#define euctw_islead(c)    ((UChar )((c) - 0xa1) > 0xfe - 0xa1)
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static UChar*
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euctw_left_adjust_char_head(const UChar* start, const UChar* s)
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{
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  /* Assumed in this encoding,
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     mb-trail bytes don't mix with single bytes.
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  */
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  const UChar *p;
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  int len;
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  if (s <= start) return (UChar* )s;
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  p = s;
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  while (!euctw_islead(*p) && p > start) p--;
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  len = enclen(ONIG_ENCODING_EUC_TW, p);
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  if (p + len > s) return (UChar* )p;
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  p += len;
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  return (UChar* )(p + ((s - p) & ~1));
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}
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static int
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euctw_is_allowed_reverse_match(const UChar* s, const UChar* end ARG_UNUSED)
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{
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  const UChar c = *s;
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  if (c <= 0x7e) return TRUE;
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  else           return FALSE;
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}
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OnigEncodingType OnigEncodingEUC_TW = {
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  euctw_mbc_enc_len,
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  "EUC-TW",   /* name */
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  4,          /* max enc length */
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  1,          /* min enc length */
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  onigenc_is_mbc_newline_0x0a,
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  euctw_mbc_to_code,
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  onigenc_mb4_code_to_mbclen,
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  euctw_code_to_mbc,
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  euctw_mbc_case_fold,
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  onigenc_ascii_apply_all_case_fold,
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  onigenc_ascii_get_case_fold_codes_by_str,
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  onigenc_minimum_property_name_to_ctype,
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  euctw_is_code_ctype,
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  onigenc_not_support_get_ctype_code_range,
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  euctw_left_adjust_char_head,
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  euctw_is_allowed_reverse_match,
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  NULL, /* init */
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  NULL, /* is_initialized */
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  is_valid_mbc_string,
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  ENC_FLAG_ASCII_COMPATIBLE,
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  0, 0
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};