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#include "base64.h"
#include <vector>
#include <stdexcept>
namespace dictzip {
std::size_t base64_decode(const std::string& encoded) {
std::vector<std::int8_t> map(256,-1);
for ( int i = 0; i < 64; ++i ) {
map["ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"[i]] = i;
}
std::size_t value = 0;
for ( std::uint8_t c : encoded ) {
if ( map[c] == -1 ) {
throw std::invalid_argument("Invalid character in BASE64 string.");
} else {
value *= 64;
value += map[c];
}
}
return value;
}
}
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