Ruby  1.9.3p448(2013-06-27revision41675)
utf_32be.c
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1 /**********************************************************************
2  utf_32be.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
33 utf32be_mbc_enc_len(const UChar* p ARG_UNUSED, const OnigUChar* e ARG_UNUSED,
34  OnigEncoding enc ARG_UNUSED)
35 {
36  return 4;
37 }
38 
39 static int
40 utf32be_is_mbc_newline(const UChar* p, const UChar* end,
41  OnigEncoding enc ARG_UNUSED)
42 {
43  if (p + 3 < end) {
44  if (*(p+3) == 0x0a && *(p+2) == 0 && *(p+1) == 0 && *p == 0)
45  return 1;
46 #ifdef USE_UNICODE_ALL_LINE_TERMINATORS
47  if ((
48 #ifndef USE_CRNL_AS_LINE_TERMINATOR
49  *(p+3) == 0x0d ||
50 #endif
51  *(p+3) == 0x85)
52  && *(p+2) == 0 && *(p+1) == 0 && *p == 0x00)
53  return 1;
54  if (*(p+2) == 0x20 && (*(p+3) == 0x29 || *(p+3) == 0x28)
55  && *(p+1) == 0 && *p == 0)
56  return 1;
57 #endif
58  }
59  return 0;
60 }
61 
62 static OnigCodePoint
63 utf32be_mbc_to_code(const UChar* p, const UChar* end ARG_UNUSED,
64  OnigEncoding enc ARG_UNUSED)
65 {
66  return (OnigCodePoint )(((p[0] * 256 + p[1]) * 256 + p[2]) * 256 + p[3]);
67 }
68 
69 static int
71  OnigEncoding enc ARG_UNUSED)
72 {
73  return 4;
74 }
75 
76 static int
78  OnigEncoding enc ARG_UNUSED)
79 {
80  UChar* p = buf;
81 
82  *p++ = (UChar )((code & 0xff000000) >>24);
83  *p++ = (UChar )((code & 0xff0000) >>16);
84  *p++ = (UChar )((code & 0xff00) >> 8);
85  *p++ = (UChar ) (code & 0xff);
86  return 4;
87 }
88 
89 static int
91  const UChar** pp, const UChar* end, UChar* fold,
92  OnigEncoding enc)
93 {
94  const UChar* p = *pp;
95 
96  if (ONIGENC_IS_ASCII_CODE(*(p+3)) && *(p+2) == 0 && *(p+1) == 0 && *p == 0) {
97  *fold++ = 0;
98  *fold++ = 0;
99 
100 #ifdef USE_UNICODE_CASE_FOLD_TURKISH_AZERI
101  if ((flag & ONIGENC_CASE_FOLD_TURKISH_AZERI) != 0) {
102  if (*(p+3) == 0x49) {
103  *fold++ = 0x01;
104  *fold = 0x31;
105  (*pp) += 4;
106  return 4;
107  }
108  }
109 #endif
110 
111  *fold++ = 0;
112  *fold = ONIGENC_ASCII_CODE_TO_LOWER_CASE(*(p+3));
113  *pp += 4;
114  return 4;
115  }
116  else
117  return onigenc_unicode_mbc_case_fold(enc, flag, pp,
118  end, fold);
119 }
120 
121 #if 0
122 static int
123 utf32be_is_mbc_ambiguous(OnigCaseFoldType flag, const UChar** pp, const UChar* end)
124 {
125  const UChar* p = *pp;
126 
127  (*pp) += 4;
128 
129  if (*(p+2) == 0 && *(p+1) == 0 && *p == 0) {
130  int c, v;
131 
132  p += 3;
133  if (*p == 0xdf && (flag & INTERNAL_ONIGENC_CASE_FOLD_MULTI_CHAR) != 0) {
134  return TRUE;
135  }
136 
137  c = *p;
138  v = ONIGENC_IS_UNICODE_ISO_8859_1_BIT_CTYPE(c,
139  (BIT_CTYPE_UPPER | BIT_CTYPE_LOWER));
140  if ((v | BIT_CTYPE_LOWER) != 0) {
141  /* 0xaa, 0xb5, 0xba are lower case letter, but can't convert. */
142  if (c >= 0xaa && c <= 0xba)
143  return FALSE;
144  else
145  return TRUE;
146  }
147  return (v != 0 ? TRUE : FALSE);
148  }
149 
150  return FALSE;
151 }
152 #endif
153 
154 static UChar*
155 utf32be_left_adjust_char_head(const UChar* start, const UChar* s, const UChar* end,
156  OnigEncoding enc ARG_UNUSED)
157 {
158  ptrdiff_t rem;
159 
160  if (s <= start) return (UChar* )s;
161 
162  rem = (s - start) % 4;
163  return (UChar* )(s - rem);
164 }
165 
166 static int
168  const OnigUChar* p, const OnigUChar* end,
169  OnigCaseFoldCodeItem items[],
170  OnigEncoding enc)
171 {
173  flag, p, end, items);
174 }
175 
176 OnigEncodingDefine(utf_32be, UTF_32BE) = {
178  "UTF-32BE", /* name */
179  4, /* max byte length */
180  4, /* min byte length */
193 };
194 ENC_ALIAS("UCS-4BE", "UTF-32BE")
195 
196