1 /**********************************************************************
2 utf16_le.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_UTF16[] = {
33 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
34 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
35 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
36 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
37 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
38 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
39 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
40 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
41 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
42 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
43 2, 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, 4, 4, 4, 4, 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, 2
49 };
50
51 static int
utf16le_code_to_mbclen(OnigCodePoint code)52 utf16le_code_to_mbclen(OnigCodePoint code)
53 {
54 return (code > 0xffff ? 4 : 2);
55 }
56
57 static int
utf16le_mbc_enc_len(const UChar * p)58 utf16le_mbc_enc_len(const UChar* p)
59 {
60 return EncLen_UTF16[*(p+1)];
61 }
62
63 static int
utf16le_is_mbc_newline(const UChar * p,const UChar * end)64 utf16le_is_mbc_newline(const UChar* p, const UChar* end)
65 {
66 if (p + 1 < end) {
67 if (*p == 0x0a && *(p+1) == 0x00)
68 return 1;
69 #ifdef USE_UNICODE_ALL_LINE_TERMINATORS
70 if ((
71 #ifndef USE_CRNL_AS_LINE_TERMINATOR
72 *p == 0x0d ||
73 #endif
74 *p == 0x85) && *(p+1) == 0x00)
75 return 1;
76 if (*(p+1) == 0x20 && (*p == 0x29 || *p == 0x28))
77 return 1;
78 #endif
79 }
80 return 0;
81 }
82
83 static OnigCodePoint
utf16le_mbc_to_code(const UChar * p,const UChar * end ARG_UNUSED)84 utf16le_mbc_to_code(const UChar* p, const UChar* end ARG_UNUSED)
85 {
86 OnigCodePoint code;
87 UChar c0 = *p;
88 UChar c1 = *(p+1);
89
90 if (UTF16_IS_SURROGATE_FIRST(c1)) {
91 code = ((((c1 - 0xd8) << 2) + ((c0 & 0xc0) >> 6) + 1) << 16)
92 + ((((c0 & 0x3f) << 2) + (p[3] - 0xdc)) << 8)
93 + p[2];
94 }
95 else {
96 code = c1 * 256 + p[0];
97 }
98 return code;
99 }
100
101 static int
utf16le_code_to_mbc(OnigCodePoint code,UChar * buf)102 utf16le_code_to_mbc(OnigCodePoint code, UChar *buf)
103 {
104 UChar* p = buf;
105
106 if (code > 0xffff) {
107 unsigned int plane, high;
108
109 plane = (code >> 16) - 1;
110 high = (code & 0xff00) >> 8;
111
112 *p++ = ((plane & 0x03) << 6) + (high >> 2);
113 *p++ = (plane >> 2) + 0xd8;
114 *p++ = (UChar )(code & 0xff);
115 *p = (high & 0x03) + 0xdc;
116 return 4;
117 }
118 else {
119 *p++ = (UChar )(code & 0xff);
120 *p++ = (UChar )((code & 0xff00) >> 8);
121 return 2;
122 }
123 }
124
125 static int
utf16le_mbc_case_fold(OnigCaseFoldType flag,const UChar ** pp,const UChar * end,UChar * fold)126 utf16le_mbc_case_fold(OnigCaseFoldType flag,
127 const UChar** pp, const UChar* end, UChar* fold)
128 {
129 const UChar* p = *pp;
130
131 if (ONIGENC_IS_ASCII_CODE(*p) && *(p+1) == 0) {
132 #ifdef USE_UNICODE_CASE_FOLD_TURKISH_AZERI
133 if ((flag & ONIGENC_CASE_FOLD_TURKISH_AZERI) != 0) {
134 if (*p == 0x49) {
135 *fold++ = 0x31;
136 *fold = 0x01;
137 (*pp) += 2;
138 return 2;
139 }
140 }
141 #endif
142
143 *fold++ = ONIGENC_ASCII_CODE_TO_LOWER_CASE(*p);
144 *fold = 0;
145 *pp += 2;
146 return 2;
147 }
148 else
149 return onigenc_unicode_mbc_case_fold(ONIG_ENCODING_UTF16_LE, flag, pp, end,
150 fold);
151 }
152
153 #if 0
154 static int
155 utf16le_is_mbc_ambiguous(OnigCaseFoldType flag, const UChar** pp,
156 const UChar* end)
157 {
158 const UChar* p = *pp;
159
160 (*pp) += EncLen_UTF16[*(p+1)];
161
162 if (*(p+1) == 0) {
163 int c, v;
164
165 if (*p == 0xdf && (flag & INTERNAL_ONIGENC_CASE_FOLD_MULTI_CHAR) != 0) {
166 return TRUE;
167 }
168
169 c = *p;
170 v = ONIGENC_IS_UNICODE_ISO_8859_1_BIT_CTYPE(c,
171 (BIT_CTYPE_UPPER | BIT_CTYPE_LOWER));
172 if ((v | BIT_CTYPE_LOWER) != 0) {
173 /* 0xaa, 0xb5, 0xba are lower case letter, but can't convert. */
174 if (c >= 0xaa && c <= 0xba)
175 return FALSE;
176 else
177 return TRUE;
178 }
179 return (v != 0 ? TRUE : FALSE);
180 }
181
182 return FALSE;
183 }
184 #endif
185
186 static UChar*
utf16le_left_adjust_char_head(const UChar * start,const UChar * s)187 utf16le_left_adjust_char_head(const UChar* start, const UChar* s)
188 {
189 if (s <= start) return (UChar* )s;
190
191 if ((s - start) % 2 == 1) {
192 s--;
193 }
194
195 if (UTF16_IS_SURROGATE_SECOND(*(s+1)) && s > start + 1)
196 s -= 2;
197
198 return (UChar* )s;
199 }
200
201 static int
utf16le_get_case_fold_codes_by_str(OnigCaseFoldType flag,const OnigUChar * p,const OnigUChar * end,OnigCaseFoldCodeItem items[])202 utf16le_get_case_fold_codes_by_str(OnigCaseFoldType flag,
203 const OnigUChar* p, const OnigUChar* end, OnigCaseFoldCodeItem items[])
204 {
205 return onigenc_unicode_get_case_fold_codes_by_str(ONIG_ENCODING_UTF16_LE,
206 flag, p, end, items);
207 }
208
209 OnigEncodingType OnigEncodingUTF16_LE = {
210 utf16le_mbc_enc_len,
211 "UTF-16LE", /* name */
212 4, /* max byte length */
213 2, /* min byte length */
214 utf16le_is_mbc_newline,
215 utf16le_mbc_to_code,
216 utf16le_code_to_mbclen,
217 utf16le_code_to_mbc,
218 utf16le_mbc_case_fold,
219 onigenc_unicode_apply_all_case_fold,
220 utf16le_get_case_fold_codes_by_str,
221 onigenc_unicode_property_name_to_ctype,
222 onigenc_unicode_is_code_ctype,
223 onigenc_utf16_32_get_ctype_code_range,
224 utf16le_left_adjust_char_head,
225 onigenc_always_false_is_allowed_reverse_match
226 };
227
