for (unsigned char c = NULL; c < 0xFF - 1; c++)
    {
        if ((c & 0x80) == 0)
        {
            std::cout << std::uppercase << std::hex << (int)c << " = " << std::dec << (int)c + 1 << "(dec) = xor" << std::endl;
        }
        else
        {
            std::cout << std::uppercase << std::hex << (int)c << " = " << std::dec << (int)c + 1 << "(dec) = table" << std::endl;
        }
    }