Question

I read byte[] from socket as Param_Code which includes ID.

byte[] cbuf = new byte[4];
socketReader.read(cbuf, 0, 4);
int Param_Code = byteArrayToIntBI(cbuf, 0);

public static int byteArrayToIntBI(byte[] b, int offset) {
        int value = 0;
        for (int i = 3; i > -1; i--) {
            int shift = (i) * 8;
            value += (b[i + offset] & 0x000000FF) << shift;
        }
    return value;
   }

• Option 1: Sometimes the Param_code corresponds only to the ID

• Option 2: Sometimes the Param_code corresponds to 0x40000000 + the ID

• Option 3: Sometimes the Param_code corresponds to 0x80000000 + the ID

My question is, How can i get ID from Param_code considering above options.

Answer 1

How about using ByteBuffer?

byte[] cbuf = new byte[4];
socketReader.read(cbuf, 0, 4);
ByteBuffer buffer = ByteBuffer.wrap(cbuf);
int Param_Code = buffer.getInt();