gd-gamesave-cryptor/Base64.hpp

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2020-05-04 17:54:23 +02:00
#pragma once
#include <string>
#include <vector>
typedef unsigned char uchar;
namespace base64 {
const std::string base64_chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
std::string Encode(const std::string &in)
{
std::string out;
int val = 0, valb = -6;
for (uchar c : in) {
val = (val << 8) + c;
valb += 8;
while (valb >= 0) {
out.push_back(base64_chars[(val >> valb) & 0x3F]);
valb -= 6;
}
}
if (valb > -6) out.push_back(base64_chars[((val << 8) >> (valb + 8)) & 0x3F]);
while (out.size() % 4) out.push_back('=');
return out;
}
std::string Decode(const std::string &in)
{
std::string out;
std::vector<int> T(256, -1);
for (int i = 0; i < 64; i++) T[base64_chars[i]] = i;
int val = 0, valb = -8;
for (uchar c : in) {
if (T[c] == -1) break;
val = (val << 6) + T[c];
valb += 6;
if (valb >= 0) {
out.push_back(char((val >> valb) & 0xFF));
valb -= 8;
}
}
return out;
}
}