42 lines
1.1 KiB
C++
42 lines
1.1 KiB
C++
#include "b64ed.hpp"
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#include <vector>
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// Custom base64 encoding/decoding tables
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static const std::string custom_base64_chars =
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"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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"abcdefghijklmnopqrstuvwxyz"
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"0123456789+_";
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std::string base64_encode(const std::string &in) {
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std::string out;
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int val = 0, valb = -6;
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for (unsigned char c : in) {
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val = (val << 8) + c;
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valb += 8;
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while (valb >= 0) {
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out.push_back(custom_base64_chars[(val >> valb) & 0x3F]);
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valb -= 6;
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}
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}
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if (valb > -6) out.push_back(custom_base64_chars[((val << 8) >> (valb + 8)) & 0x3F]);
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while (out.size() % 4) out.push_back('=');
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return out;
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}
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std::string base64_decode(const std::string &in) {
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std::vector<int> T(256, -1);
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for (int i = 0; i < 64; i++) T[custom_base64_chars[i]] = i;
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std::string out;
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int val = 0, valb = -8;
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for (unsigned char c : in) {
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if (T[c] == -1) break;
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val = (val << 6) + T[c];
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valb += 6;
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if (valb >= 0) {
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out.push_back(char((val >> valb) & 0xFF));
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valb -= 8;
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}
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}
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return out;
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} |