xref: /PHP-7.1/ext/mbstring/oniguruma/enc/utf16_be.c (revision 9d6c59ee)
1 /**********************************************************************
2   utf16_be.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
utf16be_mbc_enc_len(const UChar * p)52 utf16be_mbc_enc_len(const UChar* p)
53 {
54   return EncLen_UTF16[*p];
55 }
56 
57 static int
utf16be_is_mbc_newline(const UChar * p,const UChar * end)58 utf16be_is_mbc_newline(const UChar* p, const UChar* end)
59 {
60   if (p + 1 < end) {
61     if (*(p+1) == 0x0a && *p == 0x00)
62       return 1;
63 #ifdef USE_UNICODE_ALL_LINE_TERMINATORS
64     if ((
65 #ifndef USE_CRNL_AS_LINE_TERMINATOR
66 	 *(p+1) == 0x0d ||
67 #endif
68 	 *(p+1) == 0x85) && *p == 0x00)
69       return 1;
70     if (*p == 0x20 && (*(p+1) == 0x29 || *(p+1) == 0x28))
71       return 1;
72 #endif
73   }
74   return 0;
75 }
76 
77 static OnigCodePoint
utf16be_mbc_to_code(const UChar * p,const UChar * end)78 utf16be_mbc_to_code(const UChar* p, const UChar* end)
79 {
80   OnigCodePoint code;
81 
82   if (UTF16_IS_SURROGATE_FIRST(*p)) {
83     if (end - p < 4) return 0;
84     code = ((((p[0] - 0xd8) << 2) + ((p[1] & 0xc0) >> 6) + 1) << 16)
85          + ((((p[1] & 0x3f) << 2) + (p[2] - 0xdc)) << 8)
86          + p[3];
87   }
88   else {
89     if (end - p < 2) return 0;
90     code = p[0] * 256 + p[1];
91   }
92   return code;
93 }
94 
95 static int
utf16be_code_to_mbclen(OnigCodePoint code)96 utf16be_code_to_mbclen(OnigCodePoint code)
97 {
98   return (code > 0xffff ? 4 : 2);
99 }
100 
101 static int
utf16be_code_to_mbc(OnigCodePoint code,UChar * buf)102 utf16be_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     *p++ = (plane >> 2) + 0xd8;
111     high = (code & 0xff00) >> 8;
112     *p++ = ((plane & 0x03) << 6) + (high >> 2);
113     *p++ = (high & 0x03) + 0xdc;
114     *p   = (UChar )(code & 0xff);
115     return 4;
116   }
117   else {
118     *p++ = (UChar )((code & 0xff00) >> 8);
119     *p++ = (UChar )(code & 0xff);
120     return 2;
121   }
122 }
123 
124 static int
utf16be_mbc_case_fold(OnigCaseFoldType flag,const UChar ** pp,const UChar * end,UChar * fold)125 utf16be_mbc_case_fold(OnigCaseFoldType flag,
126 		      const UChar** pp, const UChar* end, UChar* fold)
127 {
128   const UChar* p = *pp;
129 
130   if (ONIGENC_IS_ASCII_CODE(*(p+1)) && *p == 0) {
131     p++;
132 #ifdef USE_UNICODE_CASE_FOLD_TURKISH_AZERI
133     if ((flag & ONIGENC_CASE_FOLD_TURKISH_AZERI) != 0) {
134       if (*p == 0x49) {
135 	*fold++ = 0x01;
136 	*fold   = 0x31;
137 	(*pp) += 2;
138 	return 2;
139       }
140     }
141 #endif
142 
143     *fold++ = 0;
144     *fold   = ONIGENC_ASCII_CODE_TO_LOWER_CASE(*p);
145     *pp += 2;
146     return 2;
147   }
148   else
149     return onigenc_unicode_mbc_case_fold(ONIG_ENCODING_UTF16_BE, flag,
150 					 pp, end, fold);
151 }
152 
153 #if 0
154 static int
155 utf16be_is_mbc_ambiguous(OnigCaseFoldType flag, const UChar** pp, const UChar* end)
156 {
157   const UChar* p = *pp;
158 
159   (*pp) += EncLen_UTF16[*p];
160 
161   if (*p == 0) {
162     int c, v;
163 
164     p++;
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 
173     if ((v | BIT_CTYPE_LOWER) != 0) {
174       /* 0xaa, 0xb5, 0xba are lower case letter, but can't convert. */
175       if (c >= 0xaa && c <= 0xba)
176 	return FALSE;
177       else
178 	return TRUE;
179     }
180     return (v != 0 ? TRUE : FALSE);
181   }
182 
183   return FALSE;
184 }
185 #endif
186 
187 static UChar*
utf16be_left_adjust_char_head(const UChar * start,const UChar * s)188 utf16be_left_adjust_char_head(const UChar* start, const UChar* s)
189 {
190   if (s <= start) return (UChar* )s;
191 
192   if ((s - start) % 2 == 1) {
193     s--;
194   }
195 
196   if (UTF16_IS_SURROGATE_SECOND(*s) && s > start + 1)
197     s -= 2;
198 
199   return (UChar* )s;
200 }
201 
202 static int
utf16be_get_case_fold_codes_by_str(OnigCaseFoldType flag,const OnigUChar * p,const OnigUChar * end,OnigCaseFoldCodeItem items[])203 utf16be_get_case_fold_codes_by_str(OnigCaseFoldType flag,
204     const OnigUChar* p, const OnigUChar* end, OnigCaseFoldCodeItem items[])
205 {
206   return onigenc_unicode_get_case_fold_codes_by_str(ONIG_ENCODING_UTF16_BE,
207 						    flag, p, end, items);
208 }
209 
210 OnigEncodingType OnigEncodingUTF16_BE = {
211   utf16be_mbc_enc_len,
212   "UTF-16BE",   /* name */
213   4,            /* max byte length */
214   2,            /* min byte length */
215   utf16be_is_mbc_newline,
216   utf16be_mbc_to_code,
217   utf16be_code_to_mbclen,
218   utf16be_code_to_mbc,
219   utf16be_mbc_case_fold,
220   onigenc_unicode_apply_all_case_fold,
221   utf16be_get_case_fold_codes_by_str,
222   onigenc_unicode_property_name_to_ctype,
223   onigenc_unicode_is_code_ctype,
224   onigenc_utf16_32_get_ctype_code_range,
225   utf16be_left_adjust_char_head,
226   onigenc_always_false_is_allowed_reverse_match
227 };
228