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
|
/* the Music Player Daemon (MPD)
* Copyright (C) 2003-2007 by Warren Dukes (warren.dukes@gmail.com)
* This project's homepage is: http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "utf8.h"
#include "utils.h"
#include "os_compat.h"
char *latin1_to_utf8(char *dest, const char *in_latin1)
{
unsigned char *cp = (unsigned char *)dest;
const unsigned char *latin1 = (const unsigned char *)in_latin1;
while (*latin1) {
if (*latin1 < 128)
*(cp++) = *latin1;
else {
if (*latin1 < 192) {
*(cp++) = 194;
*(cp++) = *latin1;
} else {
*(cp++) = 195;
*(cp++) = (*latin1) - 64;
}
}
++latin1;
}
*cp = '\0';
return dest;
}
char *latin1StrToUtf8Dup(const char *latin1)
{
/* utf8 should have at most two char's per latin1 char */
char *ret = xmalloc(strlen(latin1) * 2 + 1);
ret = latin1_to_utf8(ret, latin1);
return ((ret) ? xrealloc(ret, strlen((char *)ret) + 1) : NULL);
}
static char utf8_to_latin1_char(const char *inUtf8)
{
unsigned char c = 0;
const unsigned char *utf8 = (const unsigned char *)inUtf8;
if (utf8[0] < 128)
return utf8[0];
else if (utf8[0] == 195)
c += 64;
else if (utf8[0] != 194)
return '?';
return (char)(c + utf8[1]);
}
static unsigned int validateUtf8Char(const char *inUtf8Char, size_t length)
{
const unsigned char *utf8Char = (const unsigned char *)inUtf8Char;
assert(length > 0);
if (utf8Char[0] < 0x80)
return 1;
if (utf8Char[0] >= 0xC0 && utf8Char[0] <= 0xFD) {
unsigned int count = 1;
char t = 1 << 5;
unsigned int i;
while (count < 6 && (t & utf8Char[0])) {
t = (t >> 1);
count++;
}
if (count > 5 || (size_t)count > length)
return 0;
for (i = 1; i <= count; i++) {
if (utf8Char[i] < 0x80 || utf8Char[i] > 0xBF)
return 0;
}
return count + 1;
} else
return 0;
}
int validUtf8String(const char *string, size_t length)
{
unsigned int ret;
while (length > 0) {
ret = validateUtf8Char(string, length);
assert((size_t)ret <= length);
if (0 == ret)
return 0;
string += ret;
length -= ret;
}
return 1;
}
char *utf8StrToLatin1Dup(const char *utf8)
{
/* utf8 should have at most two char's per latin1 char */
char *ret = xmalloc(strlen(utf8) + 1);
char *cp = ret;
unsigned int count;
size_t len = 0;
while (*utf8) {
count = validateUtf8Char(utf8, INT_MAX);
if (!count) {
free(ret);
return NULL;
}
*(cp++) = utf8_to_latin1_char(utf8);
utf8 += count;
len++;
}
*cp = '\0';
return xrealloc(ret, len + 1);
}
char *utf8_to_latin1(char *dest, const char *utf8)
{
char *cp = dest;
unsigned int count;
size_t len = 0;
while (*utf8) {
count = validateUtf8Char(utf8, INT_MAX);
if (count) {
*(cp++) = utf8_to_latin1_char(utf8);
utf8 += count;
len++;
} else
return NULL;
}
*cp = '\0';
return dest;
}
|
