mirror of https://github.com/axmolengine/axmol.git
101 lines
3.2 KiB
C++
101 lines
3.2 KiB
C++
#include "yaml-cpp/binary.h"
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#include <cctype>
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namespace YAML {
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static const char encoding[] =
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"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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std::string EncodeBase64(const unsigned char *data, std::size_t size) {
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const char PAD = '=';
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std::string ret;
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ret.resize(4 * size / 3 + 3);
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char *out = &ret[0];
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std::size_t chunks = size / 3;
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std::size_t remainder = size % 3;
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for (std::size_t i = 0; i < chunks; i++, data += 3) {
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*out++ = encoding[data[0] >> 2];
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*out++ = encoding[((data[0] & 0x3) << 4) | (data[1] >> 4)];
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*out++ = encoding[((data[1] & 0xf) << 2) | (data[2] >> 6)];
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*out++ = encoding[data[2] & 0x3f];
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}
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switch (remainder) {
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case 0:
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break;
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case 1:
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*out++ = encoding[data[0] >> 2];
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*out++ = encoding[((data[0] & 0x3) << 4)];
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*out++ = PAD;
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*out++ = PAD;
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break;
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case 2:
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*out++ = encoding[data[0] >> 2];
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*out++ = encoding[((data[0] & 0x3) << 4) | (data[1] >> 4)];
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*out++ = encoding[((data[1] & 0xf) << 2)];
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*out++ = PAD;
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break;
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}
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ret.resize(out - &ret[0]);
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return ret;
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}
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static const unsigned char decoding[] = {
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 62, 255,
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255, 255, 63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 255, 255,
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255, 0, 255, 255, 255, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
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10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24,
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25, 255, 255, 255, 255, 255, 255, 26, 27, 28, 29, 30, 31, 32, 33,
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34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48,
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49, 50, 51, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255,
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};
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std::vector<unsigned char> DecodeBase64(const std::string &input) {
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using ret_type = std::vector<unsigned char>;
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if (input.empty())
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return ret_type();
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ret_type ret(3 * input.size() / 4 + 1);
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unsigned char *out = &ret[0];
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unsigned value = 0;
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for (std::size_t i = 0, cnt = 0; i < input.size(); i++) {
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if (std::isspace(input[i])) {
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// skip newlines
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continue;
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}
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unsigned char d = decoding[static_cast<unsigned>(input[i])];
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if (d == 255)
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return ret_type();
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value = (value << 6) | d;
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if (cnt % 4 == 3) {
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*out++ = value >> 16;
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if (i > 0 && input[i - 1] != '=')
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*out++ = value >> 8;
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if (input[i] != '=')
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*out++ = value;
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}
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++cnt;
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}
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ret.resize(out - &ret[0]);
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return ret;
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}
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} // namespace YAML
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