xref: /PHP-5.5/ext/mbstring/oniguruma/enc/utf32_le.c (revision 6284ef11)
1 /**********************************************************************
2   utf32_le.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 int
utf32le_mbc_enc_len(const UChar * p ARG_UNUSED)33 utf32le_mbc_enc_len(const UChar* p ARG_UNUSED)
34 {
35   return 4;
36 }
37 
38 static int
utf32le_is_mbc_newline(const UChar * p,const UChar * end)39 utf32le_is_mbc_newline(const UChar* p, const UChar* end)
40 {
41   if (p + 3 < end) {
42     if (*p == 0x0a && *(p+1) == 0 && *(p+2) == 0 && *(p+3) == 0)
43       return 1;
44 #ifdef USE_UNICODE_ALL_LINE_TERMINATORS
45     if ((
46 #ifndef USE_CRNL_AS_LINE_TERMINATOR
47 	 *p == 0x0d ||
48 #endif
49 	 *p == 0x85)
50 	&& *(p+1) == 0x00 && (p+2) == 0x00 && *(p+3) == 0x00)
51       return 1;
52     if (*(p+1) == 0x20 && (*p == 0x29 || *p == 0x28)
53 	&& *(p+2) == 0x00 && *(p+3) == 0x00)
54       return 1;
55 #endif
56   }
57   return 0;
58 }
59 
60 static OnigCodePoint
utf32le_mbc_to_code(const UChar * p,const UChar * end ARG_UNUSED)61 utf32le_mbc_to_code(const UChar* p, const UChar* end ARG_UNUSED)
62 {
63   return (OnigCodePoint )(((p[3] * 256 + p[2]) * 256 + p[1]) * 256 + p[0]);
64 }
65 
66 static int
utf32le_code_to_mbclen(OnigCodePoint code ARG_UNUSED)67 utf32le_code_to_mbclen(OnigCodePoint code ARG_UNUSED)
68 {
69   return 4;
70 }
71 
72 static int
utf32le_code_to_mbc(OnigCodePoint code,UChar * buf)73 utf32le_code_to_mbc(OnigCodePoint code, UChar *buf)
74 {
75   UChar* p = buf;
76 
77   *p++ = (UChar ) (code & 0xff);
78   *p++ = (UChar )((code & 0xff00)     >> 8);
79   *p++ = (UChar )((code & 0xff0000)   >>16);
80   *p++ = (UChar )((code & 0xff000000) >>24);
81   return 4;
82 }
83 
84 static int
utf32le_mbc_case_fold(OnigCaseFoldType flag,const UChar ** pp,const UChar * end,UChar * fold)85 utf32le_mbc_case_fold(OnigCaseFoldType flag,
86 		      const UChar** pp, const UChar* end, UChar* fold)
87 {
88   const UChar* p = *pp;
89 
90   if (ONIGENC_IS_ASCII_CODE(*p) && *(p+1) == 0 && *(p+2) == 0 && *(p+3) == 0) {
91 #ifdef USE_UNICODE_CASE_FOLD_TURKISH_AZERI
92     if ((flag & ONIGENC_CASE_FOLD_TURKISH_AZERI) != 0) {
93       if (*p == 0x49) {
94 	*fold++ = 0x31;
95 	*fold++ = 0x01;
96       }
97     }
98     else {
99 #endif
100       *fold++ = ONIGENC_ASCII_CODE_TO_LOWER_CASE(*p);
101       *fold++ = 0;
102 #ifdef USE_UNICODE_CASE_FOLD_TURKISH_AZERI
103     }
104 #endif
105 
106     *fold++ = 0;
107     *fold   = 0;
108     *pp += 4;
109     return 4;
110   }
111   else
112     return onigenc_unicode_mbc_case_fold(ONIG_ENCODING_UTF32_LE, flag, pp, end,
113 					 fold);
114 }
115 
116 #if 0
117 static int
118 utf32le_is_mbc_ambiguous(OnigCaseFoldType flag, const UChar** pp, const UChar* end)
119 {
120   const UChar* p = *pp;
121 
122   (*pp) += 4;
123 
124   if (*(p+1) == 0 && *(p+2) == 0 && *(p+3) == 0) {
125     int c, v;
126 
127     if (*p == 0xdf && (flag & INTERNAL_ONIGENC_CASE_FOLD_MULTI_CHAR) != 0) {
128       return TRUE;
129     }
130 
131     c = *p;
132     v = ONIGENC_IS_UNICODE_ISO_8859_1_BIT_CTYPE(c,
133                        (BIT_CTYPE_UPPER | BIT_CTYPE_LOWER));
134     if ((v | BIT_CTYPE_LOWER) != 0) {
135       /* 0xaa, 0xb5, 0xba are lower case letter, but can't convert. */
136       if (c >= 0xaa && c <= 0xba)
137 	return FALSE;
138       else
139 	return TRUE;
140     }
141     return (v != 0 ? TRUE : FALSE);
142   }
143 
144   return FALSE;
145 }
146 #endif
147 
148 static UChar*
utf32le_left_adjust_char_head(const UChar * start,const UChar * s)149 utf32le_left_adjust_char_head(const UChar* start, const UChar* s)
150 {
151   int rem;
152 
153   if (s <= start) return (UChar* )s;
154 
155   rem = (s - start) % 4;
156   return (UChar* )(s - rem);
157 }
158 
159 static int
utf32le_get_case_fold_codes_by_str(OnigCaseFoldType flag,const OnigUChar * p,const OnigUChar * end,OnigCaseFoldCodeItem items[])160 utf32le_get_case_fold_codes_by_str(OnigCaseFoldType flag,
161     const OnigUChar* p, const OnigUChar* end, OnigCaseFoldCodeItem items[])
162 {
163   return onigenc_unicode_get_case_fold_codes_by_str(ONIG_ENCODING_UTF32_LE,
164 						    flag, p, end, items);
165 }
166 
167 OnigEncodingType OnigEncodingUTF32_LE = {
168   utf32le_mbc_enc_len,
169   "UTF-32LE",   /* name */
170   4,            /* max byte length */
171   4,            /* min byte length */
172   utf32le_is_mbc_newline,
173   utf32le_mbc_to_code,
174   utf32le_code_to_mbclen,
175   utf32le_code_to_mbc,
176   utf32le_mbc_case_fold,
177   onigenc_unicode_apply_all_case_fold,
178   utf32le_get_case_fold_codes_by_str,
179   onigenc_unicode_property_name_to_ctype,
180   onigenc_unicode_is_code_ctype,
181   onigenc_utf16_32_get_ctype_code_range,
182   utf32le_left_adjust_char_head,
183   onigenc_always_false_is_allowed_reverse_match
184 };
185