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
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
|
/* Pango
* utils.c:
*
* Copyright (C) 1999 Red Hat Software
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "utils.h"
#include <iconv.h>
#include <errno.h>
#include <unicode.h>
gboolean
_pango_utf8_iterate (const char *cur, const char **next, GUChar4 *wc_out)
{
const guchar *p = (guchar *)cur;
guchar c = *p;
GUChar4 wc;
gint length;
if ((c & 0x80) == 0)
{
length = 1;
wc = c;
}
else if ((c & 0xc0) == 0x80)
{
return FALSE;
}
else if ((c & 0xe0) == 0xc0)
{
length = 2;
wc = c & 0x1f;
}
else if ((c & 0xf0) == 0xe0)
{
length = 3;
wc = c & 0x0f;
}
else
return FALSE;
p++;
while (--length > 0)
{
if (*p == 0) /* Incomplete character */
{
if (next)
*next = cur;
if (wc_out)
*wc_out = 0;
return TRUE;
}
if ((*p & 0xc0) != 0x80)
return FALSE;
wc <<= 6;
wc |= (*p) & 0x3f;
p++;
}
if (wc_out)
*wc_out = wc;
if (next)
*next = (const char *)p;
return TRUE;
}
int
_pango_utf8_len (const char *str, int limit)
{
const char *cur = str;
const char *next;
int len = 0;
while (*cur)
{
if (!_pango_utf8_iterate (cur, &next, NULL))
return -1;
if (cur == next)
break;
if (limit >= 0 && (next - str) > limit)
return len;
cur = next;
len++;
}
return len;
}
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
#define UCS2_CHARSET "UNICODELITTLE"
#else
#define UCS2_CHARSET "UNICODE"
#endif
GUChar2 *
_pango_utf8_to_ucs2 (const char *str, int len)
{
iconv_t cd;
char *outbuf, *result;
const char *inbuf;
size_t inbytesleft;
size_t outbytesleft;
gint outlen;
gint count;
cd = iconv_open (UCS2_CHARSET, "UTF-8");
if (cd == (iconv_t)-1)
g_error ("No converter from UTF-8 to " UCS2_CHARSET);
if (len < 0)
len = strlen (str);
outlen = unicode_strlen (str, len) * sizeof(GUChar2);
result = g_malloc (outlen);
inbuf = str;
inbytesleft = len;
outbuf = result;
outbytesleft = outlen;
count = iconv (cd, &inbuf, &inbytesleft, &outbuf, &outbytesleft);
if (count < 0 && (errno != E2BIG))
{
g_free (result);
result = NULL;
}
iconv_close (cd);
return (GUChar2 *)result;
}
GUChar4 *
_pango_utf8_to_ucs4 (const char *str, int len)
{
GUChar4 *result;
int n_chars, i;
const char *p;
n_chars = unicode_strlen (str, len);
result = g_new (GUChar4, n_chars);
p = str;
for (i=0; i < n_chars; i++)
p = unicode_get_utf8 (p, &result[i]);
return result;
}
/**
* _pango_guchar4_to_utf8:
* @ch: a ISO10646 character code
* @out: output buffer, must have at least 6 bytes of space.
*
* Convert a single character to utf8
*
* Return value: number of bytes written
**/
int
_pango_guchar4_to_utf8 (GUChar4 c, char *outbuf)
{
size_t len = 0;
int first;
int i;
if (c < 0x80)
{
first = 0;
len = 1;
}
else if (c < 0x800)
{
first = 0xc0;
len = 2;
}
else if (c < 0x10000)
{
first = 0xe0;
len = 3;
}
else if (c < 0x200000)
{
first = 0xf0;
len = 4;
}
else if (c < 0x4000000)
{
first = 0xf8;
len = 5;
}
else
{
first = 0xfc;
len = 6;
}
for (i = len - 1; i > 0; --i)
{
outbuf[i] = (c & 0x3f) | 0x80;
c >>= 6;
}
outbuf[0] = c | first;
return len;
}
|
