void Base64Encoding()

in common.cpp [533:588]

• 55 lines of code
• 7 McCabe index (conditional complexity)

void Base64Encoding(std::istream& is, std::ostream& os, char makeupChar, const char *alphabet)
{
    int out[4];
    int remain = 0;
    while (!is.eof())
    {
        int byte1 = is.get();
        if (byte1 < 0)
        {
            break;
        }
        int byte2 = is.get();
        int byte3;
        if (byte2 < 0)
        {
            byte2 = 0;
            byte3 = 0;
            remain = 1;
        }
        else
        {
            byte3 = is.get();
            if (byte3 < 0)
            {
                byte3 = 0;
                remain = 2;
            }
        }
        out[0] = static_cast<unsigned>(byte1) >> 2;
        out[1] = ((byte1 & 0x03) << 4) + (static_cast<unsigned>(byte2) >> 4);
        out[2] = ((byte2 & 0x0F) << 2) + (static_cast<unsigned>(byte3) >> 6);
        out[3] = byte3 & 0x3F;

        if (remain == 1)
        {
            os.put(out[0] = alphabet[out[0]]);
            os.put(out[1] = alphabet[out[1]]);
            os.put(makeupChar);
            os.put(makeupChar);
        }
        else if (remain == 2)
        {
            os.put(out[0] = alphabet[out[0]]);
            os.put(out[1] = alphabet[out[1]]);
            os.put(out[2] = alphabet[out[2]]);
            os.put(makeupChar);
        }
        else
        {
            os.put(out[0] = alphabet[out[0]]);
            os.put(out[1] = alphabet[out[1]]);
            os.put(out[2] = alphabet[out[2]]);
            os.put(out[3] = alphabet[out[3]]);
        }
    }
}