Language Java Nosugar Comms Code Byteswapper.java

// 
//	ByteSwapper class
//	part of the set of documents known as Java no sugar.
//	Copyright (c) 1996 Sunil Gupta, sunil@magnetic.demon.co.uk
//	placed into the public domain by the author
//
import java.io.*;

public class ByteSwapper extends Object
{
	public static long swapLong(long value)
	{
		long	lhs, rhs;
		long answer;
		
		rhs = (long) swapInt( loInt(value)) ;
		lhs = (long) swapInt( hiInt(value)) ;
		
		answer = (rhs * 0x100000000l ) + lhs;
		return  answer;
	}
	
	public static int swapInt(int value)
	{
		short lhs, rhs;
		
		rhs = swapShort( loWord(value)) ;
		lhs = swapShort( hiWord(value)) ;
		
		return  (rhs * 0x10000) + lhs;
	}

	public static short swapShort(short value)
	{
		int lhs, rhs, answer;
		
		rhs = (int) loByte(value);
		lhs = (int) hiByte(value);

		answer = (rhs * 0x100) + lhs;
		return (short)answer;
	}
	
	
	public static int loInt(long value)
	{
		long answer;
		
		answer = value & 0xFFFFFFFFl;
		return ( (int) answer);
	}

	public static int hiInt(long value)
	{
		long answer;
		
		answer = value >>> 32;
		
		return ( (int) answer);
	}
	
	public static short loWord(int value)
	{
		return  (short) (value & 0xFFFF);
	}

	public static short hiWord(int value)
	{
		return  (short) ( value >>> 16);
	}
	
	public static byte loByte(short value)
	{
		return (byte) (value & 0xFF); 
	}
	
	public static byte hiByte(short value)
	{
		return (byte) (value >>> 8);
	}

	//############################################################################
	// 			TESTING
	//############################################################################
	public static void main(String args[])
	{
		int swapped;
		
		
		//***************** test short swapping **********************
		swapped = swapShort((short)0x1234);
		if ( swapped == 0x3412 )
			System.out.println ("short byteswapping code is fine");
		else
		{
			System.out.println (
				"short byteswapping code is b******d\n" + 
				"\twanted: " + 0x3412 + "\n" +
				"\tgot   : " + swapped 
			);
		}

		//***************** test int swapping **********************
		swapped = swapInt(0x12345678);
		if ( swapped == 0x78563412 )
			System.out.println ("int byteswapping code is fine");
		else
		{
			System.out.println (
				"short byteswapping code is b******d\n" + 
				"\twanted: " + 0x78563412 + "\n" +
				"\tgot   : " + swapped 
			);
		}
	}
	
}

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