45 lines
1023 B
C++
45 lines
1023 B
C++
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#pragma once
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#include <string>
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#include <vector>
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typedef unsigned char uchar;
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namespace base64 {
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const std::string base64_chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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std::string Encode(const std::string &in)
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{
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std::string out;
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int val = 0, valb = -6;
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for (uchar 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(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(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 Decode(const std::string &in)
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{
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std::string out;
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std::vector<int> T(256, -1);
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for (int i = 0; i < 64; i++) T[base64_chars[i]] = i;
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int val = 0, valb = -8;
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for (uchar 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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}
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}
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