Base64.cpp

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#include <string>
#include <vector>
 
#include <tdme/tdme.h>
#include <tdme/utilities/Base64.h>
 
using std::string;
using std::vector;
 
using tdme::utilities::Base64;
 
void Base64::encode(const string& decodedString, string& encodedString) {
    // see: https://stackoverflow.com/questions/180947/base64-decode-snippet-in-c/34571089#34571089
    string dictionary = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
    int val = 0, valb = -6;
    for (uint8_t c: decodedString) {
        val = (val << 8) + c;
        valb+= 8;
        while (valb >= 0) {
            encodedString.push_back(dictionary[(val >> valb) & 0x3F]);
            valb-= 6;
        }
    }
    if (valb > -6) encodedString.push_back(dictionary[((val << 8) >> (valb + 8)) & 0x3F]);
    while (encodedString.size() % 4) encodedString.push_back('=');
}
 
void Base64::encode(const vector<uint8_t>& decodedData, string& encodedString) {
    // see: https://stackoverflow.com/questions/180947/base64-decode-snippet-in-c/34571089#34571089
    string dictionary = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
    int val = 0, valb = -6;
    for (uint8_t c: decodedData) {
        val = (val << 8) + c;
        valb+= 8;
        while (valb >= 0) {
            encodedString.push_back(dictionary[(val >> valb) & 0x3F]);
            valb-= 6;
        }
    }
    if (valb > -6) encodedString.push_back(dictionary[((val << 8) >> (valb + 8)) & 0x3F]);
    while (encodedString.size() % 4) encodedString.push_back('=');
}
 
void Base64::decode(const string& encodedString, string& decodedString) {
    // see: https://stackoverflow.com/questions/180947/base64-decode-snippet-in-c/34571089#34571089
    string dictionary = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
    std::vector<int> T(256, -1);
    for (int i = 0; i < 64; i++) T[dictionary[i]] = i;
    int val = 0, valb = -8;
    for (uint8_t c: encodedString) {
        if (T[c] == -1) break;
        val = (val << 6) + T[c];
        valb+= 6;
        if (valb >= 0) {
            decodedString.push_back(char((val >> valb) & 0xFF));
            valb-= 8;
        }
    }
}
 
void Base64::decode(const string& encodedString, vector<uint8_t>& decodedData) {
    // see: https://stackoverflow.com/questions/180947/base64-decode-snippet-in-c/34571089#34571089
    string dictionary = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
    std::vector<int> T(256, -1);
    for (int i = 0; i < 64; i++) T[dictionary[i]] = i;
        int val = 0, valb = -8;
        for (uint8_t c: encodedString) {
            if (T[c] == -1) break;
            val = (val << 6) + T[c];
            valb+= 6;
            if (valb >= 0) {
                decodedData.push_back(char((val >> valb) & 0xFF));
            valb-= 8;
        }
    }
}