Annotation of embedaddon/php/ext/mbstring/oniguruma/enc/utf16_le.c, revision 1.1.1.1
1.1 misho 1: /**********************************************************************
2: utf16_le.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: utf16le_code_to_mbclen(OnigCodePoint code)
56: {
57: return (code > 0xffff ? 4 : 2);
58: }
59:
60: static int
61: utf16le_mbc_enc_len(const UChar* p)
62: {
63: return EncLen_UTF16[*(p+1)];
64: }
65:
66: static int
67: utf16le_is_mbc_newline(const UChar* p, const UChar* end)
68: {
69: if (p + 1 < end) {
70: if (*p == 0x0a && *(p+1) == 0x00)
71: return 1;
72: #ifdef USE_UNICODE_ALL_LINE_TERMINATORS
73: if ((*p == 0x0d || *p == 0x85) && *(p+1) == 0x00)
74: return 1;
75: if (*(p+1) == 0x20 && (*p == 0x29 || *p == 0x28))
76: return 1;
77: #endif
78: }
79: return 0;
80: }
81:
82: static OnigCodePoint
83: utf16le_mbc_to_code(const UChar* p, const UChar* end)
84: {
85: OnigCodePoint code;
86: UChar c0 = *p;
87: UChar c1 = *(p+1);
88:
89: if (UTF16_IS_SURROGATE_FIRST(c1)) {
90: code = ((((c1 - 0xd8) << 2) + ((c0 & 0xc0) >> 6) + 1) << 16)
91: + ((((c0 & 0x3f) << 2) + (p[3] - 0xdc)) << 8)
92: + p[2];
93: }
94: else {
95: code = c1 * 256 + p[0];
96: }
97: return code;
98: }
99:
100: static int
101: utf16le_code_to_mbc(OnigCodePoint code, UChar *buf)
102: {
103: UChar* p = buf;
104:
105: if (code > 0xffff) {
106: unsigned int plane, high;
107:
108: plane = code >> 16;
109: high = (code & 0xff00) >> 8;
110:
111: *p++ = ((plane & 0x03) << 6) + (high >> 2);
112: *p++ = (plane >> 2) + 0xd8;
113: *p++ = (UChar )(code & 0xff);
114: *p = (high & 0x02) + 0xdc;
115: return 4;
116: }
117: else {
118: *p++ = (UChar )(code & 0xff);
119: *p++ = (UChar )((code & 0xff00) >> 8);
120: return 2;
121: }
122: }
123:
124: static int
125: utf16le_mbc_to_normalize(OnigAmbigType flag, const UChar** pp, const UChar* end,
126: UChar* lower)
127: {
128: const UChar* p = *pp;
129:
130: if (*(p+1) == 0) {
131: *(lower+1) = '\0';
132: if (((flag & ONIGENC_AMBIGUOUS_MATCH_ASCII_CASE) != 0 &&
133: ONIGENC_IS_MBC_ASCII(p)) ||
134: ((flag & ONIGENC_AMBIGUOUS_MATCH_NONASCII_CASE) != 0 &&
135: !ONIGENC_IS_MBC_ASCII(p))) {
136: *lower = ONIGENC_ISO_8859_1_TO_LOWER_CASE(*p);
137: }
138: else {
139: *lower = *p;
140: }
141: (*pp) += 2;
142: return 2; /* return byte length of converted char to lower */
143: }
144: else {
145: int len = EncLen_UTF16[*(p+1)];
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: utf16le_is_mbc_ambiguous(OnigAmbigType flag, const UChar** pp, const UChar* end)
159: {
160: const UChar* p = *pp;
161:
162: (*pp) += EncLen_UTF16[*(p+1)];
163:
164: if (*(p+1) == 0) {
165: int c, v;
166:
167: if (((flag & ONIGENC_AMBIGUOUS_MATCH_ASCII_CASE) != 0 &&
168: ONIGENC_IS_MBC_ASCII(p)) ||
169: ((flag & ONIGENC_AMBIGUOUS_MATCH_NONASCII_CASE) != 0 &&
170: !ONIGENC_IS_MBC_ASCII(p))) {
171: c = *p;
172: v = ONIGENC_IS_UNICODE_ISO_8859_1_CTYPE(c,
173: (ONIGENC_CTYPE_UPPER | ONIGENC_CTYPE_LOWER));
174: if ((v | ONIGENC_CTYPE_LOWER) != 0) {
175: /* 0xaa, 0xb5, 0xba are lower case letter, but can't convert. */
176: if (c >= 0xaa && c <= 0xba)
177: return FALSE;
178: else
179: return TRUE;
180: }
181: return (v != 0 ? TRUE : FALSE);
182: }
183: }
184:
185: return FALSE;
186: }
187:
188: static UChar*
189: utf16le_left_adjust_char_head(const UChar* start, const UChar* s)
190: {
191: if (s <= start) return (UChar* )s;
192:
193: if ((s - start) % 2 == 1) {
194: s--;
195: }
196:
197: if (UTF16_IS_SURROGATE_SECOND(*(s+1)) && s > start + 1)
198: s -= 2;
199:
200: return (UChar* )s;
201: }
202:
203: OnigEncodingType OnigEncodingUTF16_LE = {
204: utf16le_mbc_enc_len,
205: "UTF-16LE", /* name */
206: 4, /* max byte length */
207: 2, /* min byte length */
208: (ONIGENC_AMBIGUOUS_MATCH_ASCII_CASE |
209: ONIGENC_AMBIGUOUS_MATCH_NONASCII_CASE ),
210: {
211: (OnigCodePoint )'\\' /* esc */
212: , (OnigCodePoint )ONIG_INEFFECTIVE_META_CHAR /* anychar '.' */
213: , (OnigCodePoint )ONIG_INEFFECTIVE_META_CHAR /* anytime '*' */
214: , (OnigCodePoint )ONIG_INEFFECTIVE_META_CHAR /* zero or one time '?' */
215: , (OnigCodePoint )ONIG_INEFFECTIVE_META_CHAR /* one or more time '+' */
216: , (OnigCodePoint )ONIG_INEFFECTIVE_META_CHAR /* anychar anytime */
217: },
218: utf16le_is_mbc_newline,
219: utf16le_mbc_to_code,
220: utf16le_code_to_mbclen,
221: utf16le_code_to_mbc,
222: utf16le_mbc_to_normalize,
223: utf16le_is_mbc_ambiguous,
224: onigenc_iso_8859_1_get_all_pair_ambig_codes,
225: onigenc_ess_tsett_get_all_comp_ambig_codes,
226: onigenc_unicode_is_code_ctype,
227: onigenc_unicode_get_ctype_code_range,
228: utf16le_left_adjust_char_head,
229: onigenc_always_false_is_allowed_reverse_match
230: };
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