Question

I have a byte array that contains 6 bytes last 2 represents the port number while searching for a way two convert these last to bytes to a port number i have come across this snippet,

            int port = 0;
        port |= peerList[i+4] & 0xFF;
        port <<= 8;
        port |= peerList[i+5] & 0xFF;

it works but i need some clarification as to how it works?

Answer 1

  =======================
  |  byte 5  |  byte 6  |
  |----------|----------|
  | 01010101 | 01010101 |
  =======================

Basically, it takes byte #5, shift is 8 bits to the left resulting in 0101010100000000 and then uses the bitwise or operator to put the byte 6 in the place of zeros.