xref: /PHP-5.6/ext/mbstring/oniguruma/enc/euc_tw.c (revision fe92d64a)
1 /**********************************************************************
2   euc_tw.c -  Oniguruma (regular expression library)
3 **********************************************************************/
4 /*-
5  * Copyright (c) 2002-2008  K.Kosako  <sndgk393 AT ybb DOT ne DOT jp>
6  * All rights reserved.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice, this list of conditions and the following disclaimer.
13  * 2. Redistributions in binary form must reproduce the above copyright
14  *    notice, this list of conditions and the following disclaimer in the
15  *    documentation and/or other materials provided with the distribution.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27  * SUCH DAMAGE.
28  */
29 
30 #include "regenc.h"
31 
32 static const int EncLen_EUCTW[] = {
33   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
34   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
35   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
36   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
37   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
38   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
39   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
40   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
41   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 4, 1,
42   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
43   1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
44   2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
45   2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
46   2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
47   2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
48   2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1
49 };
50 
51 static int
euctw_mbc_enc_len(const UChar * p)52 euctw_mbc_enc_len(const UChar* p)
53 {
54   return EncLen_EUCTW[*p];
55 }
56 
57 static OnigCodePoint
euctw_mbc_to_code(const UChar * p,const UChar * end)58 euctw_mbc_to_code(const UChar* p, const UChar* end)
59 {
60   return onigenc_mbn_mbc_to_code(ONIG_ENCODING_EUC_TW, p, end);
61 }
62 
63 static int
euctw_code_to_mbc(OnigCodePoint code,UChar * buf)64 euctw_code_to_mbc(OnigCodePoint code, UChar *buf)
65 {
66   return onigenc_mb4_code_to_mbc(ONIG_ENCODING_EUC_TW, code, buf);
67 }
68 
69 static int
euctw_mbc_case_fold(OnigCaseFoldType flag,const UChar ** pp,const UChar * end,UChar * lower)70 euctw_mbc_case_fold(OnigCaseFoldType flag, const UChar** pp, const UChar* end,
71                     UChar* lower)
72 {
73   return onigenc_mbn_mbc_case_fold(ONIG_ENCODING_EUC_TW, flag,
74                                    pp, end, lower);
75 }
76 
77 static int
euctw_is_code_ctype(OnigCodePoint code,unsigned int ctype)78 euctw_is_code_ctype(OnigCodePoint code, unsigned int ctype)
79 {
80   return onigenc_mb4_is_code_ctype(ONIG_ENCODING_EUC_TW, code, ctype);
81 }
82 
83 #define euctw_islead(c)    ((UChar )((c) - 0xa1) > 0xfe - 0xa1)
84 
85 static UChar*
euctw_left_adjust_char_head(const UChar * start,const UChar * s)86 euctw_left_adjust_char_head(const UChar* start, const UChar* s)
87 {
88   /* Assumed in this encoding,
89      mb-trail bytes don't mix with single bytes.
90   */
91   const UChar *p;
92   int len;
93 
94   if (s <= start) return (UChar* )s;
95   p = s;
96 
97   while (!euctw_islead(*p) && p > start) p--;
98   len = enclen(ONIG_ENCODING_EUC_TW, p);
99   if (p + len > s) return (UChar* )p;
100   p += len;
101   return (UChar* )(p + ((s - p) & ~1));
102 }
103 
104 static int
euctw_is_allowed_reverse_match(const UChar * s,const UChar * end ARG_UNUSED)105 euctw_is_allowed_reverse_match(const UChar* s, const UChar* end ARG_UNUSED)
106 {
107   const UChar c = *s;
108   if (c <= 0x7e) return TRUE;
109   else           return FALSE;
110 }
111 
112 OnigEncodingType OnigEncodingEUC_TW = {
113   euctw_mbc_enc_len,
114   "EUC-TW",   /* name */
115   4,          /* max enc length */
116   1,          /* min enc length */
117   onigenc_is_mbc_newline_0x0a,
118   euctw_mbc_to_code,
119   onigenc_mb4_code_to_mbclen,
120   euctw_code_to_mbc,
121   euctw_mbc_case_fold,
122   onigenc_ascii_apply_all_case_fold,
123   onigenc_ascii_get_case_fold_codes_by_str,
124   onigenc_minimum_property_name_to_ctype,
125   euctw_is_code_ctype,
126   onigenc_not_support_get_ctype_code_range,
127   euctw_left_adjust_char_head,
128   euctw_is_allowed_reverse_match
129 };
130