xref: /PHP-5.6/ext/mbstring/oniguruma/enc/euc_kr.c (revision fe92d64a)
1 /**********************************************************************
2   euc_kr.c -  Oniguruma (regular expression library)
3 **********************************************************************/
4 /*-
5  * Copyright (c) 2002-2007  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_EUCKR[] = {
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, 1, 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
euckr_mbc_enc_len(const UChar * p)52 euckr_mbc_enc_len(const UChar* p)
53 {
54   return EncLen_EUCKR[*p];
55 }
56 
57 static OnigCodePoint
euckr_mbc_to_code(const UChar * p,const UChar * end)58 euckr_mbc_to_code(const UChar* p, const UChar* end)
59 {
60   return onigenc_mbn_mbc_to_code(ONIG_ENCODING_EUC_KR, p, end);
61 }
62 
63 static int
euckr_code_to_mbc(OnigCodePoint code,UChar * buf)64 euckr_code_to_mbc(OnigCodePoint code, UChar *buf)
65 {
66   return onigenc_mb2_code_to_mbc(ONIG_ENCODING_EUC_KR, code, buf);
67 }
68 
69 static int
euckr_mbc_case_fold(OnigCaseFoldType flag,const UChar ** pp,const UChar * end,UChar * lower)70 euckr_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_KR, flag,
74                                    pp, end, lower);
75 }
76 
77 #if 0
78 static int
79 euckr_is_mbc_ambiguous(OnigCaseFoldType flag,
80 		       const UChar** pp, const UChar* end)
81 {
82   return onigenc_mbn_is_mbc_ambiguous(ONIG_ENCODING_EUC_KR, flag, pp, end);
83 }
84 #endif
85 
86 static int
euckr_is_code_ctype(OnigCodePoint code,unsigned int ctype)87 euckr_is_code_ctype(OnigCodePoint code, unsigned int ctype)
88 {
89   return onigenc_mb2_is_code_ctype(ONIG_ENCODING_EUC_KR, code, ctype);
90 }
91 
92 #define euckr_islead(c)    ((c) < 0xa1 || (c) == 0xff)
93 
94 static UChar*
euckr_left_adjust_char_head(const UChar * start,const UChar * s)95 euckr_left_adjust_char_head(const UChar* start, const UChar* s)
96 {
97   /* Assumed in this encoding,
98      mb-trail bytes don't mix with single bytes.
99   */
100   const UChar *p;
101   int len;
102 
103   if (s <= start) return (UChar* )s;
104   p = s;
105 
106   while (!euckr_islead(*p) && p > start) p--;
107   len = enclen(ONIG_ENCODING_EUC_KR, p);
108   if (p + len > s) return (UChar* )p;
109   p += len;
110   return (UChar* )(p + ((s - p) & ~1));
111 }
112 
113 static int
euckr_is_allowed_reverse_match(const UChar * s,const UChar * end ARG_UNUSED)114 euckr_is_allowed_reverse_match(const UChar* s, const UChar* end ARG_UNUSED)
115 {
116   const UChar c = *s;
117   if (c <= 0x7e) return TRUE;
118   else           return FALSE;
119 }
120 
121 OnigEncodingType OnigEncodingEUC_KR = {
122   euckr_mbc_enc_len,
123   "EUC-KR",   /* name */
124   2,          /* max enc length */
125   1,          /* min enc length */
126   onigenc_is_mbc_newline_0x0a,
127   euckr_mbc_to_code,
128   onigenc_mb2_code_to_mbclen,
129   euckr_code_to_mbc,
130   euckr_mbc_case_fold,
131   onigenc_ascii_apply_all_case_fold,
132   onigenc_ascii_get_case_fold_codes_by_str,
133   onigenc_minimum_property_name_to_ctype,
134   euckr_is_code_ctype,
135   onigenc_not_support_get_ctype_code_range,
136   euckr_left_adjust_char_head,
137   euckr_is_allowed_reverse_match
138 };
139 
140 /* Same with OnigEncodingEUC_KR except the name */
141 OnigEncodingType OnigEncodingEUC_CN = {
142   euckr_mbc_enc_len,
143   "EUC-CN",   /* name */
144   2,          /* max enc length */
145   1,          /* min enc length */
146   onigenc_is_mbc_newline_0x0a,
147   euckr_mbc_to_code,
148   onigenc_mb2_code_to_mbclen,
149   euckr_code_to_mbc,
150   euckr_mbc_case_fold,
151   onigenc_ascii_apply_all_case_fold,
152   onigenc_ascii_get_case_fold_codes_by_str,
153   onigenc_minimum_property_name_to_ctype,
154   euckr_is_code_ctype,
155   onigenc_not_support_get_ctype_code_range,
156   euckr_left_adjust_char_head,
157   euckr_is_allowed_reverse_match
158 };
159