1 /**********************************************************************
2 big5.c - Oniguruma (regular expression library)
3 **********************************************************************/
4 /*-
5 * Copyright (c) 2002-2019 K.Kosako
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_BIG5[] = {
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
big5_mbc_enc_len(const UChar * p)52 big5_mbc_enc_len(const UChar* p)
53 {
54 return EncLen_BIG5[*p];
55 }
56
57 static int
big5_code_to_mbclen(OnigCodePoint code)58 big5_code_to_mbclen(OnigCodePoint code)
59 {
60 if ((code & (~0xffff)) != 0) return ONIGERR_INVALID_CODE_POINT_VALUE;
61 if ((code & 0xff00) != 0) return 2;
62 if (EncLen_BIG5[(int )(code & 0xff)] == 1) return 1;
63
64 return ONIGERR_INVALID_CODE_POINT_VALUE;
65 }
66
67 static int
is_valid_mbc_string(const UChar * p,const UChar * end)68 is_valid_mbc_string(const UChar* p, const UChar* end)
69 {
70 while (p < end) {
71 if (*p < 0x80) {
72 p++;
73 }
74 else if (*p < 0xa1) {
75 return FALSE;
76 }
77 else if (*p < 0xff) {
78 p++;
79 if (p >= end) return FALSE;
80 if (*p < 0x40) return FALSE;
81 if (*p > 0x7e && *p < 0xa1) return FALSE;
82 if (*p == 0xff) return FALSE;
83 p++;
84 }
85 else
86 return FALSE;
87 }
88
89 return TRUE;
90 }
91
92 static OnigCodePoint
big5_mbc_to_code(const UChar * p,const UChar * end)93 big5_mbc_to_code(const UChar* p, const UChar* end)
94 {
95 return onigenc_mbn_mbc_to_code(ONIG_ENCODING_BIG5, p, end);
96 }
97
98 static int
big5_code_to_mbc(OnigCodePoint code,UChar * buf)99 big5_code_to_mbc(OnigCodePoint code, UChar *buf)
100 {
101 return onigenc_mb2_code_to_mbc(ONIG_ENCODING_BIG5, code, buf);
102 }
103
104 static int
big5_mbc_case_fold(OnigCaseFoldType flag,const UChar ** pp,const UChar * end,UChar * lower)105 big5_mbc_case_fold(OnigCaseFoldType flag, const UChar** pp, const UChar* end,
106 UChar* lower)
107 {
108 return onigenc_mbn_mbc_case_fold(ONIG_ENCODING_BIG5, flag,
109 pp, end, lower);
110 }
111
112 static int
big5_is_code_ctype(OnigCodePoint code,unsigned int ctype)113 big5_is_code_ctype(OnigCodePoint code, unsigned int ctype)
114 {
115 return onigenc_mb2_is_code_ctype(ONIG_ENCODING_BIG5, code, ctype);
116 }
117
118 static const char BIG5_CAN_BE_TRAIL_TABLE[256] = {
119 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
120 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
121 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
122 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
123 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
124 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
125 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
126 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0,
127 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
128 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
129 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
130 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
131 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
132 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
133 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
134 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0
135 };
136
137 #define BIG5_ISMB_FIRST(byte) (EncLen_BIG5[byte] > 1)
138 #define BIG5_ISMB_TRAIL(byte) BIG5_CAN_BE_TRAIL_TABLE[(byte)]
139
140 static UChar*
big5_left_adjust_char_head(const UChar * start,const UChar * s)141 big5_left_adjust_char_head(const UChar* start, const UChar* s)
142 {
143 const UChar *p;
144 int len;
145
146 if (s <= start) return (UChar* )s;
147 p = s;
148
149 if (BIG5_ISMB_TRAIL(*p)) {
150 while (p > start) {
151 if (! BIG5_ISMB_FIRST(*--p)) {
152 p++;
153 break;
154 }
155 }
156 }
157 len = enclen(ONIG_ENCODING_BIG5, p);
158 if (p + len > s) return (UChar* )p;
159 p += len;
160 return (UChar* )(p + ((s - p) & ~1));
161 }
162
163 static int
big5_is_allowed_reverse_match(const UChar * s,const UChar * end ARG_UNUSED)164 big5_is_allowed_reverse_match(const UChar* s, const UChar* end ARG_UNUSED)
165 {
166 const UChar c = *s;
167
168 return (BIG5_ISMB_TRAIL(c) ? FALSE : TRUE);
169 }
170
171 OnigEncodingType OnigEncodingBIG5 = {
172 big5_mbc_enc_len,
173 "Big5", /* name */
174 2, /* max enc length */
175 1, /* min enc length */
176 onigenc_is_mbc_newline_0x0a,
177 big5_mbc_to_code,
178 big5_code_to_mbclen,
179 big5_code_to_mbc,
180 big5_mbc_case_fold,
181 onigenc_ascii_apply_all_case_fold,
182 onigenc_ascii_get_case_fold_codes_by_str,
183 onigenc_minimum_property_name_to_ctype,
184 big5_is_code_ctype,
185 onigenc_not_support_get_ctype_code_range,
186 big5_left_adjust_char_head,
187 big5_is_allowed_reverse_match,
188 NULL, /* init */
189 NULL, /* is_initialized */
190 is_valid_mbc_string,
191 ENC_FLAG_ASCII_COMPATIBLE|ENC_FLAG_SKIP_OFFSET_1,
192 0, 0
193 };
194
