Mega Code Archive
Utility for byte swapping of all java data types
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/*
* (C) 2004 - Geotechnical Software Services
*
* This code is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This code is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, write to the Free
* Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
* MA 02111-1307, USA.
*/
//package no.geosoft.cc.util;
/**
* Utility class for doing byte swapping (i.e. conversion between
* little-endian and big-endian representations) of different data types.
* Byte swapping is typically used when data is read from a stream
* delivered by a system of different endian type as the present one.
*
* @author <a href="mailto:jacob.dreyer@geosoft.no">Jacob Dreyer</a>
*/
public class ByteSwapper
{
/**
* Byte swap a single short value.
*
* @param value Value to byte swap.
* @return Byte swapped representation.
*/
public static short swap (short value)
{
int b1 = value & 0xff;
int b2 = (value >> 8) & 0xff;
return (short) (b1 << 8 | b2 << 0);
}
/**
* Byte swap a single int value.
*
* @param value Value to byte swap.
* @return Byte swapped representation.
*/
public static int swap (int value)
{
int b1 = (value >> 0) & 0xff;
int b2 = (value >> 8) & 0xff;
int b3 = (value >> 16) & 0xff;
int b4 = (value >> 24) & 0xff;
return b1 << 24 | b2 << 16 | b3 << 8 | b4 << 0;
}
/**
* Byte swap a single long value.
*
* @param value Value to byte swap.
* @return Byte swapped representation.
*/
public static long swap (long value)
{
long b1 = (value >> 0) & 0xff;
long b2 = (value >> 8) & 0xff;
long b3 = (value >> 16) & 0xff;
long b4 = (value >> 24) & 0xff;
long b5 = (value >> 32) & 0xff;
long b6 = (value >> 40) & 0xff;
long b7 = (value >> 48) & 0xff;
long b8 = (value >> 56) & 0xff;
return b1 << 56 | b2 << 48 | b3 << 40 | b4 << 32 |
b5 << 24 | b6 << 16 | b7 << 8 | b8 << 0;
}
/**
* Byte swap a single float value.
*
* @param value Value to byte swap.
* @return Byte swapped representation.
*/
public static float swap (float value)
{
int intValue = Float.floatToIntBits (value);
intValue = swap (intValue);
return Float.intBitsToFloat (intValue);
}
/**
* Byte swap a single double value.
*
* @param value Value to byte swap.
* @return Byte swapped representation.
*/
public static double swap (double value)
{
long longValue = Double.doubleToLongBits (value);
longValue = swap (longValue);
return Double.longBitsToDouble (longValue);
}
/**
* Byte swap an array of shorts. The result of the swapping
* is put back into the specified array.
*
* @param array Array of values to swap
*/
public static void swap (short[] array)
{
for (int i = 0; i < array.length; i++)
array[i] = swap (array[i]);
}
/**
* Byte swap an array of ints. The result of the swapping
* is put back into the specified array.
*
* @param array Array of values to swap
*/
public static void swap (int[] array)
{
for (int i = 0; i < array.length; i++)
array[i] = swap (array[i]);
}
/**
* Byte swap an array of longs. The result of the swapping
* is put back into the specified array.
*
* @param array Array of values to swap
*/
public static void swap (long[] array)
{
for (int i = 0; i < array.length; i++)
array[i] = swap (array[i]);
}
/**
* Byte swap an array of floats. The result of the swapping
* is put back into the specified array.
*
* @param array Array of values to swap
*/
public static void swap (float[] array)
{
for (int i = 0; i < array.length; i++)
array[i] = swap (array[i]);
}
/**
* Byte swap an array of doubles. The result of the swapping
* is put back into the specified array.
*
* @param array Array of values to swap
*/
public static void swap (double[] array)
{
for (int i = 0; i < array.length; i++)
array[i] = swap (array[i]);
}
}
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