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
|
#include "yaml-cpp/binary.h"
namespace YAML {
static const char encoding[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
std::string EncodeBase64(const unsigned char *data, std::size_t size) {
const char PAD = '=';
std::string ret;
ret.resize(4 * size / 3 + 3);
char *out = &ret[0];
std::size_t chunks = size / 3;
std::size_t remainder = size % 3;
for (std::size_t i = 0; i < chunks; i++, data += 3) {
*out++ = encoding[data[0] >> 2];
*out++ = encoding[((data[0] & 0x3) << 4) | (data[1] >> 4)];
*out++ = encoding[((data[1] & 0xf) << 2) | (data[2] >> 6)];
*out++ = encoding[data[2] & 0x3f];
}
switch (remainder) {
case 0:
break;
case 1:
*out++ = encoding[data[0] >> 2];
*out++ = encoding[((data[0] & 0x3) << 4)];
*out++ = PAD;
*out++ = PAD;
break;
case 2:
*out++ = encoding[data[0] >> 2];
*out++ = encoding[((data[0] & 0x3) << 4) | (data[1] >> 4)];
*out++ = encoding[((data[1] & 0xf) << 2)];
*out++ = PAD;
break;
}
ret.resize(out - &ret[0]);
return ret;
}
static const unsigned char decoding[] = {
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 62, 255,
255, 255, 63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 255, 255,
255, 0, 255, 255, 255, 0, 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, 255, 255, 255, 255, 255, 255, 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, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255,
};
std::vector<unsigned char> DecodeBase64(const std::string &input) {
typedef std::vector<unsigned char> ret_type;
if (input.empty())
return ret_type();
ret_type ret(3 * input.size() / 4 + 1);
unsigned char *out = &ret[0];
unsigned value = 0;
for (std::size_t i = 0; i < input.size(); i++) {
unsigned char d = decoding[static_cast<unsigned>(input[i])];
if (d == 255)
return ret_type();
value = (value << 6) | d;
if (i % 4 == 3) {
*out++ = value >> 16;
if (i > 0 && input[i - 1] != '=')
*out++ = value >> 8;
if (input[i] != '=')
*out++ = value;
}
}
ret.resize(out - &ret[0]);
return ret;
}
}
|
