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
|
// This file is part of BOINC.
// http://boinc.berkeley.edu
// Copyright (C) 2008 University of California
//
// BOINC 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 3 of the License, or (at your option) any later version.
//
// BOINC 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 Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with BOINC. If not, see <http://www.gnu.org/licenses/>.
#if defined(_WIN32) && !defined(__STDWX_H__)
#include "boinc_win.h"
#elif defined(_WIN32) && defined(__STDWX_H__)
#include "stdwx.h"
#else
#include "config.h"
#endif
#ifdef _USING_FCGI_
#include "boinc_fcgi.h"
#endif
#include "base64.h"
using std::string;
// Table of characters coding the 64 values.
static char base64_value_to_char[64] =
{
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', // 0- 9
'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', // 10-19
'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', // 20-29
'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', // 30-39
'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', // 40-49
'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7', // 50-59
'8', '9', '+', '/' // 60-63
};
// Table of base64 values for first 128 characters.
static short base64_char_to_value[128] =
{
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 0- 9
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 10- 19
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 20- 29
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 30- 39
-1, -1, -1, 62, -1, -1, -1, 63, 52, 53, // 40- 49
54, 55, 56, 57, 58, 59, 60, 61, -1, -1, // 50- 59
-1, -1, -1, -1, -1, 0, 1, 2, 3, 4, // 60- 69
5, 6, 7, 8, 9, 10, 11, 12, 13, 14, // 70- 79
15, 16, 17, 18, 19, 20, 21, 22, 23, 24, // 80- 89
25, -1, -1, -1, -1, -1, -1, 26, 27, 28, // 90- 99
29, 30, 31, 32, 33, 34, 35, 36, 37, 38, // 100-109
39, 40, 41, 42, 43, 44, 45, 46, 47, 48, // 110-119
49, 50, 51, -1, -1, -1, -1, -1 // 120-127
};
/* The following diagram shows the logical steps by which three octets
get transformed into four base64 characters.
.--------. .--------. .--------.
|aaaaaabb| |bbbbcccc| |ccdddddd|
`--------' `--------' `--------'
6 2 4 4 2 6
.--------+--------+--------+--------.
|00aaaaaa|00bbbbbb|00cccccc|00dddddd|
`--------+--------+--------+--------'
.--------+--------+--------+--------.
|AAAAAAAA|BBBBBBBB|CCCCCCCC|DDDDDDDD|
`--------+--------+--------+--------'
The octets are divided into 6 bit chunks, which are then encoded into
base64 characters. */
string r_base64_encode (const char* from, size_t length)
{
string result;
result.reserve(length + length/3 + 1);
size_t i = 0;
int c;
unsigned int value;
while (i < length)
{
c = from[i++];
// Process first byte of a triplet.
result += base64_value_to_char[0x3f & c >> 2];
value = (0x03 & c) << 4;
// Process second byte of a triplet.
if (i == length)
{
result += base64_value_to_char[value];
result += '=';
result += '=';
break;
}
c = from[i++];
result += base64_value_to_char[value | (0x0f & c >> 4)];
value = (0x0f & c) << 2;
// Process third byte of a triplet.
if (i == length)
{
result += base64_value_to_char[value];
result += '=';
break;
}
c = from[i++];
result += base64_value_to_char[value | (0x03 & c >> 6)];
result += base64_value_to_char[0x3f & c];
}
return result;
}
#define IS_ASCII(Character) \
((Character) < 128)
#define IS_BASE64(Character) \
(IS_ASCII (Character) && base64_char_to_value[Character] >= 0)
#define IS_BASE64_IGNORABLE(Character) \
((Character) == ' ' || (Character) == '\t' || (Character) == '\n' \
|| (Character) == '\f' || (Character) == '\r')
#define READ_QUADRUPLET_BYTE() \
do { \
if (i == length) return result; \
c = from[i++]; \
} \
while (IS_BASE64_IGNORABLE (c))
string r_base64_decode (const char* from, size_t length)
{
size_t i = 0;
string result;
unsigned char c;
unsigned long value;
while (true)
{
// Process first byte of a quadruplet.
READ_QUADRUPLET_BYTE();
if (!IS_BASE64 (c))
throw InvalidBase64Exception();
value = base64_char_to_value[c] << 18;
// Process second byte of a quadruplet.
READ_QUADRUPLET_BYTE();
if (!IS_BASE64 (c))
throw InvalidBase64Exception();
value |= base64_char_to_value[c] << 12;
c = (unsigned char) (value >> 16);
result += c;
// Process third byte of a quadruplet.
READ_QUADRUPLET_BYTE();
if (c == '=')
{
READ_QUADRUPLET_BYTE();
if (c != '=')
throw InvalidBase64Exception();
continue;
}
if (!IS_BASE64 (c))
throw InvalidBase64Exception();
value |= base64_char_to_value[c] << 6;
c = (unsigned char) (0xff & value >> 8);
result += c;
// Process fourth byte of a quadruplet.
READ_QUADRUPLET_BYTE();
if (c == '=')
continue;
if (!IS_BASE64 (c))
throw InvalidBase64Exception();
value |= base64_char_to_value[c];
c = (unsigned char) (0xff & value);
result += c;
}
}
|
