Annotation of embedaddon/php/ext/mbstring/oniguruma/enc/utf16_be.c, revision 1.1.1.1
1.1 misho 1: /**********************************************************************
2: utf16_be.c - Oniguruma (regular expression library)
3: **********************************************************************/
4: /*-
5: * Copyright (c) 2002-2006 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: #define UTF16_IS_SURROGATE_FIRST(c) (c >= 0xd8 && c <= 0xdb)
33: #define UTF16_IS_SURROGATE_SECOND(c) (c >= 0xdc && c <= 0xdf)
34:
35: static const int EncLen_UTF16[] = {
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, 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, 2,
49: 2, 2, 2, 2, 2, 2, 2, 2, 4, 4, 4, 4, 2, 2, 2, 2,
50: 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
51: 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2
52: };
53:
54: static int
55: utf16be_mbc_enc_len(const UChar* p)
56: {
57: return EncLen_UTF16[*p];
58: }
59:
60: static int
61: utf16be_is_mbc_newline(const UChar* p, const UChar* end)
62: {
63: if (p + 1 < end) {
64: if (*(p+1) == 0x0a && *p == 0x00)
65: return 1;
66: #ifdef USE_UNICODE_ALL_LINE_TERMINATORS
67: if ((*(p+1) == 0x0d || *(p+1) == 0x85) && *p == 0x00)
68: return 1;
69: if (*p == 0x20 && (*(p+1) == 0x29 || *(p+1) == 0x28))
70: return 1;
71: #endif
72: }
73: return 0;
74: }
75:
76: static OnigCodePoint
77: utf16be_mbc_to_code(const UChar* p, const UChar* end)
78: {
79: OnigCodePoint code;
80:
81: if (UTF16_IS_SURROGATE_FIRST(*p)) {
82: code = ((((p[0] - 0xd8) << 2) + ((p[1] & 0xc0) >> 6) + 1) << 16)
83: + ((((p[1] & 0x3f) << 2) + (p[2] - 0xdc)) << 8)
84: + p[3];
85: }
86: else {
87: code = p[0] * 256 + p[1];
88: }
89: return code;
90: }
91:
92: static int
93: utf16be_code_to_mbclen(OnigCodePoint code)
94: {
95: return (code > 0xffff ? 4 : 2);
96: }
97:
98: static int
99: utf16be_code_to_mbc(OnigCodePoint code, UChar *buf)
100: {
101: UChar* p = buf;
102:
103: if (code > 0xffff) {
104: unsigned int plane, high;
105:
106: plane = code >> 16;
107: *p++ = (plane >> 2) + 0xd8;
108: high = (code & 0xff00) >> 8;
109: *p++ = ((plane & 0x03) << 6) + (high >> 2);
110: *p++ = (high & 0x02) + 0xdc;
111: *p = (UChar )(code & 0xff);
112: return 4;
113: }
114: else {
115: *p++ = (UChar )((code & 0xff00) >> 8);
116: *p++ = (UChar )(code & 0xff);
117: return 2;
118: }
119: }
120:
121: static int
122: utf16be_mbc_to_normalize(OnigAmbigType flag, const UChar** pp, const UChar* end,
123: UChar* lower)
124: {
125: const UChar* p = *pp;
126:
127: if (*p == 0) {
128: p++;
129: *lower++ = '\0';
130: if (((flag & ONIGENC_AMBIGUOUS_MATCH_ASCII_CASE) != 0 &&
131: ONIGENC_IS_MBC_ASCII(p)) ||
132: ((flag & ONIGENC_AMBIGUOUS_MATCH_NONASCII_CASE) != 0 &&
133: !ONIGENC_IS_MBC_ASCII(p))) {
134: *lower = ONIGENC_ISO_8859_1_TO_LOWER_CASE(*p);
135: }
136: else {
137: *lower = *p;
138: }
139:
140: (*pp) += 2;
141: return 2; /* return byte length of converted char to lower */
142: }
143: else {
144: int len;
145: len = EncLen_UTF16[*p];
146: if (lower != p) {
147: int i;
148: for (i = 0; i < len; i++) {
149: *lower++ = *p++;
150: }
151: }
152: (*pp) += len;
153: return len; /* return byte length of converted char to lower */
154: }
155: }
156:
157: static int
158: utf16be_is_mbc_ambiguous(OnigAmbigType flag, const UChar** pp, const UChar* end)
159: {
160: const UChar* p = *pp;
161:
162: (*pp) += EncLen_UTF16[*p];
163:
164: if (*p == 0) {
165: int c, v;
166:
167: p++;
168: if (((flag & ONIGENC_AMBIGUOUS_MATCH_ASCII_CASE) != 0 &&
169: ONIGENC_IS_MBC_ASCII(p)) ||
170: ((flag & ONIGENC_AMBIGUOUS_MATCH_NONASCII_CASE) != 0 &&
171: !ONIGENC_IS_MBC_ASCII(p))) {
172: c = *p;
173: v = ONIGENC_IS_UNICODE_ISO_8859_1_CTYPE(c,
174: (ONIGENC_CTYPE_UPPER | ONIGENC_CTYPE_LOWER));
175:
176: if ((v | ONIGENC_CTYPE_LOWER) != 0) {
177: /* 0xaa, 0xb5, 0xba are lower case letter, but can't convert. */
178: if (c >= 0xaa && c <= 0xba)
179: return FALSE;
180: else
181: return TRUE;
182: }
183: return (v != 0 ? TRUE : FALSE);
184: }
185: }
186:
187: return FALSE;
188: }
189:
190: static UChar*
191: utf16be_left_adjust_char_head(const UChar* start, const UChar* s)
192: {
193: if (s <= start) return (UChar* )s;
194:
195: if ((s - start) % 2 == 1) {
196: s--;
197: }
198:
199: if (UTF16_IS_SURROGATE_SECOND(*s) && s > start + 1)
200: s -= 2;
201:
202: return (UChar* )s;
203: }
204:
205: OnigEncodingType OnigEncodingUTF16_BE = {
206: utf16be_mbc_enc_len,
207: "UTF-16BE", /* name */
208: 4, /* max byte length */
209: 2, /* min byte length */
210: (ONIGENC_AMBIGUOUS_MATCH_ASCII_CASE |
211: ONIGENC_AMBIGUOUS_MATCH_NONASCII_CASE ),
212: {
213: (OnigCodePoint )'\\' /* esc */
214: , (OnigCodePoint )ONIG_INEFFECTIVE_META_CHAR /* anychar '.' */
215: , (OnigCodePoint )ONIG_INEFFECTIVE_META_CHAR /* anytime '*' */
216: , (OnigCodePoint )ONIG_INEFFECTIVE_META_CHAR /* zero or one time '?' */
217: , (OnigCodePoint )ONIG_INEFFECTIVE_META_CHAR /* one or more time '+' */
218: , (OnigCodePoint )ONIG_INEFFECTIVE_META_CHAR /* anychar anytime */
219: },
220: utf16be_is_mbc_newline,
221: utf16be_mbc_to_code,
222: utf16be_code_to_mbclen,
223: utf16be_code_to_mbc,
224: utf16be_mbc_to_normalize,
225: utf16be_is_mbc_ambiguous,
226: onigenc_iso_8859_1_get_all_pair_ambig_codes,
227: onigenc_ess_tsett_get_all_comp_ambig_codes,
228: onigenc_unicode_is_code_ctype,
229: onigenc_unicode_get_ctype_code_range,
230: utf16be_left_adjust_char_head,
231: onigenc_always_false_is_allowed_reverse_match
232: };
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