1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
|
/* $NetBSD: unicode.h,v 1.1.1.1 2007/03/06 00:10:39 dillo Exp $ */
/*-
* Copyright (c) 2007 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Dieter Baron.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* $FreeBSD$
*/
#include <sys/types.h>
#define UNICODE_DECOMPOSE 0x01
#define UNICODE_PRECOMPOSE 0x02
#define UNICODE_UTF8_LATIN1_FALLBACK 0x03
size_t utf8_to_utf16(uint16_t *, size_t, const char *, size_t, int, int *);
size_t utf16_to_utf8(char *, size_t, const uint16_t *, size_t, int, int *);
size_t
utf8_to_utf16(uint16_t *dst, size_t dst_len,
const char *src, size_t src_len,
int flags, int *errp)
{
const unsigned char *s;
size_t spos, dpos;
int error;
uint16_t c;
#define IS_CONT(c) (((c)&0xc0) == 0x80)
error = 0;
s = (const unsigned char *)src;
spos = dpos = 0;
while (spos<src_len) {
if (s[spos] < 0x80)
c = s[spos++];
else if ((flags & UNICODE_UTF8_LATIN1_FALLBACK)
&& (spos >= src_len || !IS_CONT(s[spos+1]))
&& s[spos]>=0xa0) {
/* not valid UTF-8, assume ISO 8859-1 */
c = s[spos++];
}
else if (s[spos] < 0xc0 || s[spos] >= 0xf5) {
/* continuation byte without lead byte
or lead byte for codepoint above 0x10ffff */
error++;
spos++;
continue;
}
else if (s[spos] < 0xe0) {
if (spos >= src_len || !IS_CONT(s[spos+1])) {
spos++;
error++;
continue;
}
c = ((s[spos] & 0x3f) << 6) | (s[spos+1] & 0x3f);
spos += 2;
if (c < 0x80) {
/* overlong encoding */
error++;
continue;
}
}
else if (s[spos] < 0xf0) {
if (spos >= src_len-2
|| !IS_CONT(s[spos+1]) || !IS_CONT(s[spos+2])) {
spos++;
error++;
continue;
}
c = ((s[spos] & 0x0f) << 12) | ((s[spos+1] & 0x3f) << 6)
| (s[spos+2] & 0x3f);
spos += 3;
if (c < 0x800 || (c & 0xdf00) == 0xd800 ) {
/* overlong encoding or encoded surrogate */
error++;
continue;
}
}
else {
uint32_t cc;
/* UTF-16 surrogate pair */
if (spos >= src_len-3 || !IS_CONT(s[spos+1])
|| !IS_CONT(s[spos+2]) || !IS_CONT(s[spos+3])) {
spos++;
error++;
continue;
}
cc = ((s[spos] & 0x03) << 18) | ((s[spos+1] & 0x3f) << 12)
| ((s[spos+2] & 0x3f) << 6) | (s[spos+3] & 0x3f);
spos += 4;
if (cc < 0x10000) {
/* overlong encoding */
error++;
continue;
}
if (dst && dpos < dst_len)
dst[dpos] = (0xd800 | ((cc-0x10000)>>10));
dpos++;
c = 0xdc00 | ((cc-0x10000) & 0x3ffff);
}
if (dst && dpos < dst_len)
dst[dpos] = c;
dpos++;
}
if (errp)
*errp = error;
return dpos;
#undef IS_CONT
}
size_t
utf16_to_utf8(char *dst, size_t dst_len,
const uint16_t *src, size_t src_len,
int flags, int *errp)
{
uint16_t spos, dpos;
int error;
#define CHECK_LENGTH(l) (dpos > dst_len-(l) ? dst=NULL : NULL)
#define ADD_BYTE(b) (dst ? dst[dpos] = (b) : 0, dpos++)
error = 0;
dpos = 0;
for (spos=0; spos<src_len; spos++) {
if (src[spos] < 0x80) {
CHECK_LENGTH(1);
ADD_BYTE(src[spos]);
}
else if (src[spos] < 0x800) {
CHECK_LENGTH(2);
ADD_BYTE(0xc0 | (src[spos]>>6));
ADD_BYTE(0x80 | (src[spos] & 0x3f));
}
else if ((src[spos] & 0xdc00) == 0xd800) {
uint32_t c;
/* first surrogate */
if (spos == src_len - 1 || (src[spos] & 0xdc00) != 0xdc00) {
/* no second surrogate present */
error++;
continue;
}
spos++;
CHECK_LENGTH(4);
c = (((src[spos]&0x3ff) << 10) | (src[spos+1]&0x3ff)) + 0x10000;
ADD_BYTE(0xf0 | (c>>18));
ADD_BYTE(0x80 | ((c>>12) & 0x3f));
ADD_BYTE(0x80 | ((c>>6) & 0x3f));
ADD_BYTE(0x80 | (c & 0x3f));
}
else if ((src[spos] & 0xdc00) == 0xdc00) {
/* second surrogate without preceding first surrogate */
error++;
}
else {
CHECK_LENGTH(3);
ADD_BYTE(0xe0 | src[spos]>>12);
ADD_BYTE(0x80 | ((src[spos]>>6) & 0x3f));
ADD_BYTE(0x80 | (src[spos] & 0x3f));
}
}
if (errp)
*errp = error;
return dpos;
#undef ADD_BYTE
#undef CHECK_LENGTH
}
|
