Question

I need to read and write signed and unsigned integers with a SeekableByteChannel in little endian format. This may seem silly, but I cannot find something in the JDK. Have I missed something or am I expected to roll this on my own? This would be no problem, but I don’t feel like reinventing the wheel today. 🙂

Answer 1

Sounds like a work for the ByteBuffer.

Somewhat like

public static void main(String[] args) {
    byte[] payload = toArray(-1991249);
    int number = fromArray(payload);
    System.out.println(number);
}

public static  int fromArray(byte[] payload){
    ByteBuffer buffer = ByteBuffer.wrap(payload);
    buffer.order(ByteOrder.LITTLE_ENDIAN);
    return buffer.getInt();
}

public static byte[] toArray(int value){
    ByteBuffer buffer = ByteBuffer.allocate(4);
    buffer.order(ByteOrder.LITTLE_ENDIAN);
    buffer.putInt(value);
    return buffer.array();
}