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
|
/***
This file is part of PulseAudio.
Copyright 2008 Colin Guthrie
PulseAudio is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published
by the Free Software Foundation; either version 2.1 of the License,
or (at your option) any later version.
PulseAudio 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 Lesser General Public License
along with PulseAudio; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
USA.
***/
/*
This file was originally inspired by a file developed by
Kungliga Tekniska H�gskolan
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdlib.h>
#include <string.h>
#include <pulse/xmalloc.h>
#include "base64.h"
static const char base64_chars[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
static int pos(char c)
{
if (c >= 'A' && c <= 'Z') return c - 'A' + 0;
if (c >= 'a' && c <= 'z') return c - 'a' + 26;
if (c >= '0' && c <= '9') return c - '0' + 52;
if (c == '+') return 62;
if (c == '/') return 63;
return -1;
}
int pa_base64_encode(const void *data, int size, char **str)
{
char *s, *p;
int i;
int c;
const unsigned char *q;
p = s = pa_xnew(char, size * 4 / 3 + 4);
q = (const unsigned char *) data;
i = 0;
for (i = 0; i < size;) {
c = q[i++];
c *= 256;
if (i < size)
c += q[i];
i++;
c *= 256;
if (i < size)
c += q[i];
i++;
p[0] = base64_chars[(c & 0x00fc0000) >> 18];
p[1] = base64_chars[(c & 0x0003f000) >> 12];
p[2] = base64_chars[(c & 0x00000fc0) >> 6];
p[3] = base64_chars[(c & 0x0000003f) >> 0];
if (i > size)
p[3] = '=';
if (i > size + 1)
p[2] = '=';
p += 4;
}
*p = 0;
*str = s;
return strlen(s);
}
#define DECODE_ERROR 0xffffffff
static unsigned int token_decode(const char *token)
{
int i;
unsigned int val = 0;
int marker = 0;
if (strlen(token) < 4)
return DECODE_ERROR;
for (i = 0; i < 4; i++) {
val *= 64;
if (token[i] == '=')
marker++;
else if (marker > 0)
return DECODE_ERROR;
else {
int lpos = pos(token[i]);
if (lpos < 0)
return DECODE_ERROR;
val += lpos;
}
}
if (marker > 2)
return DECODE_ERROR;
return (marker << 24) | val;
}
int pa_base64_decode(const char *str, void *data)
{
const char *p;
unsigned char *q;
q = data;
for (p = str; *p && (*p == '=' || strchr(base64_chars, *p)); p += 4) {
unsigned int val = token_decode(p);
unsigned int marker = (val >> 24) & 0xff;
if (val == DECODE_ERROR)
return -1;
*q++ = (val >> 16) & 0xff;
if (marker < 2)
*q++ = (val >> 8) & 0xff;
if (marker < 1)
*q++ = val & 0xff;
}
return q - (unsigned char *) data;
}
|
