cppBitOperationExamples

#include <iostream>

char* encodecode(char* str, char key)
{
    char* start{ str };

    while (*str)
    {
        *str ^= key; //*str = *str ^ key
        ++str;
    }

    return start;
}

uint8_t maskLength(uint8_t mask)
{
    uint8_t maskLength{ 0 };
    uint8_t maskShift{ mask };

    while (maskShift)
    {
        maskShift <<= 1; // maskShift = maskShift << 1
        ++maskLength;
    }
    return maskLength;
}

int main()
{
    //uint8_t byteA{ 0b01010101 };
    //uint8_t byteB{ 0b10011110 };
    //uint8_t byteRes{ 0 };

    //// 0b01010101
    //// 0b10011110
    ////
    //// 0b11001010
    //// 0b10011110
    ////
    //// 0b01010101
    //// 0b01010101

    //byteRes = byteA ^ byteB;
    //
    //std::cout << +byteA << '\n';
    //std::cout << +byteRes << '\n';

    //byteRes = byteRes ^ byteB;
    //std::cout << +byteRes << '\n';


    //char str[]{ "Some top secret message about this summer! :(" };

    //std::cout << "Original str:\n";
    //std::cout << str << '\n';
    //std::cout << "\nEncoded str:\n";
    //std::cout << encodecode(str, 'G') << '\n';
    //std::cout << "\nDecoded str:\n";
    //std::cout << encodecode(str, 'q') << '\n';

    // 192.168.[00001 010].2/21
    // 192.168.10.2/21
    //
    // 255.255.255.0

    uint8_t ipA{ 0b10100001 };
    uint8_t ipB{ 0b10100101 };
    uint8_t ipC{ 0b11100001 };
    uint8_t ipD{ 0b11101101 };

    uint8_t mask{ 0b11110000 };

    // mask
    // 0b11110000
    // 0b00001111

    // ipA
    // 0b10100001
    // 0b00001111
    // 0b00000001



    std::cout << +maskLength(mask) << '\n';

    uint8_t netA = ipA >> maskLength(mask);
    uint8_t hostA = ipA & (~mask);

    uint8_t netB = ipB >> maskLength(mask);
    uint8_t hostB = ipB & (~mask);

    uint8_t netC = ipC >> maskLength(mask);
    uint8_t hostC = ipC & (~mask);

    uint8_t netD = ipD >> maskLength(mask);
    uint8_t hostD = ipD & (~mask);

    std::cout << +ipA << ' ' << +netA << ' ' << +hostA << '\n';
    std::cout << +ipB << ' ' << +netB << ' ' << +hostB << '\n';
    std::cout << +ipC << ' ' << +netC << ' ' << +hostC << '\n';
    std::cout << +ipD << ' ' << +netD << ' ' << +hostD << '\n';

}