1 #include "yaml-cpp/binary.h"
2
3 namespace YODA_YAML {
4 static const char encoding[] =
5 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
6
EncodeBase64(const unsigned char * data,std::size_t size)7 std::string EncodeBase64(const unsigned char *data, std::size_t size) {
8 const char PAD = '=';
9
10 std::string ret;
11 ret.resize(4 * size / 3 + 3);
12 char *out = &ret[0];
13
14 std::size_t chunks = size / 3;
15 std::size_t remainder = size % 3;
16
17 for (std::size_t i = 0; i < chunks; i++, data += 3) {
18 *out++ = encoding[data[0] >> 2];
19 *out++ = encoding[((data[0] & 0x3) << 4) | (data[1] >> 4)];
20 *out++ = encoding[((data[1] & 0xf) << 2) | (data[2] >> 6)];
21 *out++ = encoding[data[2] & 0x3f];
22 }
23
24 switch (remainder) {
25 case 0:
26 break;
27 case 1:
28 *out++ = encoding[data[0] >> 2];
29 *out++ = encoding[((data[0] & 0x3) << 4)];
30 *out++ = PAD;
31 *out++ = PAD;
32 break;
33 case 2:
34 *out++ = encoding[data[0] >> 2];
35 *out++ = encoding[((data[0] & 0x3) << 4) | (data[1] >> 4)];
36 *out++ = encoding[((data[1] & 0xf) << 2)];
37 *out++ = PAD;
38 break;
39 }
40
41 ret.resize(out - &ret[0]);
42 return ret;
43 }
44
45 static const unsigned char decoding[] = {
46 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
47 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
48 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 62, 255,
49 255, 255, 63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 255, 255,
50 255, 0, 255, 255, 255, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
51 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24,
52 25, 255, 255, 255, 255, 255, 255, 26, 27, 28, 29, 30, 31, 32, 33,
53 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48,
54 49, 50, 51, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
55 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
56 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
57 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
58 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
59 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
60 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
61 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
62 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
63 255,
64 };
65
DecodeBase64(const std::string & input)66 std::vector<unsigned char> DecodeBase64(const std::string &input) {
67 typedef std::vector<unsigned char> ret_type;
68 if (input.empty())
69 return ret_type();
70
71 ret_type ret(3 * input.size() / 4 + 1);
72 unsigned char *out = &ret[0];
73
74 unsigned value = 0;
75 for (std::size_t i = 0; i < input.size(); i++) {
76 unsigned char d = decoding[static_cast<unsigned>(input[i])];
77 if (d == 255)
78 return ret_type();
79
80 value = (value << 6) | d;
81 if (i % 4 == 3) {
82 *out++ = value >> 16;
83 if (i > 0 && input[i - 1] != '=')
84 *out++ = value >> 8;
85 if (input[i] != '=')
86 *out++ = value;
87 }
88 }
89
90 ret.resize(out - &ret[0]);
91 return ret;
92 }
93 }
94