// IntBytesConverter.java
//
// Informatics 102 Winter 2010
// Assignment #4
//
// This class can be used to convert an int to an array of four bytes and
// back again.

public class IntBytesConverter
{
	public static byte[] convertIntToBytes(int i)
	{
		return new byte[] {
			(byte) (i >>> 24), (byte) (i >>> 16),
			(byte) (i >>> 8), (byte) i
		};
	}
	
	
	public static int convertBytesToInt(byte[] b)
	{
		if (b == null || b.length != 4)
		{
			throw new IllegalArgumentException(
				"Argument must be an array of four bytes");
		}
		
		return (b[0] << 24) + ((b[1] & 0xFF) << 16)
			+ ((b[2] & 0xFF) << 8) + (b[3] & 0xFF);
	}
}