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
|
/*
* Baltisot
* Copyright (C) 1999-2008 Nicolas "Pixel" Noble
*
* 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 <Base64.h>
static char cb64[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
static char lookup[] = {
// x0 x1 x2 x3 x4 x5 x6 x7 x8 x9 xA xB xC xD xE xF
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 1x
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 62, 0, 0, 0, 63, // 2x
52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 0, 0, 0, 0, 0, 0, // 3x
0, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, // 4x
15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 0, 0, 0, 0, 0, // 5x
0, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, // 6x
41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 0, 0, 0, 0, 0, // 7x
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 8x
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 9x
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // Ax
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // Bx
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // Cx
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // Dx
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // Ex
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // Fx
};
String Base64::encode_block(unsigned char in_tab[3], int len) {
char r[5];
r[0] = cb64[in_tab[0] >> 2];
r[1] = cb64[((in_tab[0] & 3) << 4) | ((in_tab[1] & 240) >> 4)];
r[2] = len > 1 ? cb64[((in_tab[1] & 15) << 2) | ((in_tab[2] & 192) >> 6)] : '=';
r[3] = len > 2 ? cb64[in_tab[2] & 63] : '=';
r[4] = 0;
return r;
}
String Base64::encode(const char * data, int stream_size) {
String encoded = "";
unsigned char in_tab[3];
int len, i, s_pos;
s_pos = 0;
while (stream_size > 0) {
in_tab[0] = 0;
in_tab[1] = 0;
in_tab[2] = 0;
len = stream_size >= 3 ? 3 : stream_size;
for (i = 0; i < len; i++) {
in_tab[i] = data[s_pos + i];
}
encoded += encode_block(in_tab, len);
s_pos += 3;
stream_size -= 3;
}
return encoded;
}
int Base64::stri(char x) {
return lookup[(unsigned char) x];
}
int Base64::decode_block(char s1, char s2, char s3, char s4, unsigned char * out_tab) {
int len, sb1, sb2, sb3, sb4;
len = s3 == '=' ? 1 : s4 == '=' ? 2 : 3;
s3 = (s3 == '=') || (s3 == 0) ? 'A' : s3;
s4 = (s4 == '=') || (s4 == 0) ? 'A' : s4;
sb1 = stri(s1);
sb2 = stri(s2);
sb3 = stri(s3);
sb4 = stri(s4);
out_tab[0] = (sb1 << 2) | (sb2 >> 4);
out_tab[1] = ((sb2 << 4) & 255) | (sb3 >> 2);
out_tab[2] = ((sb3 << 6) & 240) | sb4;
return len;
}
unsigned char * Base64::decode(const String & str_in, int * len_out) {
int s_len = str_in.strlen(), len = 0, i, j, t_len;
char s1, s2, s3, s4;
unsigned char t_out[3];
unsigned char * out = (unsigned char *) malloc(s_len * 3 / 4 + 4);
unsigned char * p = out;
for (i = 0; i < s_len; i += 4) {
s1 = str_in[i + 0];
s2 = str_in[i + 1];
s3 = str_in[i + 2];
s4 = str_in[i + 3];
t_len = decode_block(s1, s2, s3, s4, t_out);
for (j = 0; j < t_len; j++) {
*(p++) = t_out[j];
}
len += t_len;
}
if (len_out) {
*len_out = len;
}
return out;
}
|
