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| #include "yaml-cpp/binary.h"
|
| #include <cctype>
|
| 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) {
| using ret_type = std::vector<unsigned char>;
| 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, cnt = 0; i < input.size(); i++) {
| if (std::isspace(static_cast<unsigned char>(input[i]))) {
| // skip newlines
| continue;
| }
| unsigned char d = decoding[static_cast<unsigned char>(input[i])];
| if (d == 255)
| return ret_type();
|
| value = (value << 6) | d;
| if (cnt % 4 == 3) {
| *out++ = value >> 16;
| if (i > 0 && input[i - 1] != '=')
| *out++ = value >> 8;
| if (input[i] != '=')
| *out++ = value;
| }
| ++cnt;
| }
|
| ret.resize(out - &ret[0]);
| return ret;
| }
| } // namespace YAML
|
|
