mirror of
https://github.com/jbeder/yaml-cpp.git
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94 lines
3.4 KiB
C++
94 lines
3.4 KiB
C++
#include "yaml-cpp/binary.h"
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namespace YAML
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{
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static const char encoding[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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std::string EncodeBase64(const unsigned char *data, std::size_t size)
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{
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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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255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
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255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
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255,255,255,255,255,255,255,255,255,255,255, 62,255,255,255, 63,
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52, 53, 54, 55, 56, 57, 58, 59, 60, 61,255,255,255, 0,255,255,
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255, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
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15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25,255,255,255,255,255,
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255, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
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41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51,255,255,255,255,255,
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255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
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255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
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255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
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255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
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255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
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255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
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255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
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255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
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};
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std::vector<unsigned char> DecodeBase64(const std::string& input)
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{
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typedef std::vector<unsigned char> ret_type;
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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;i<input.size();i++) {
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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(i % 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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}
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ret.resize(out - &ret[0]);
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return ret;
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}
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}
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