ucar.unidata.io

Class Swap

java.lang.Object

ucar.unidata.io.Swap

public class Swap
extends java.lang.Object

The Swap class provides static methods for swapping the bytes of chars, shorts, ints, longs, floats, and doubles.

Version:

$Id: Swap.java 64 2006-07-12 22:30:50Z edavis $

Author:

Kirk Waters, Russ Rew, 1998, added documentation

Constructor Summary

Constructors

Constructor and Description
Swap()

Method Summary

Methods

Modifier and Type	Method and Description
static byte[]	intToBytes(int v) Convert an int to an array of 4 bytes.
static byte[]	longToBytes(long v) Convert a long to an array of 8 bytes.
static byte[]	shortToBytes(short v) Convert a short to an array of 2 bytes.
static char	swapChar(byte[] b, int offset) Returns the char resulting from swapping 2 bytes at a specified offset in a byte array.
static double	swapDouble(byte[] b, int offset) Returns the double resulting from reversing 8 bytes at a specified offset in a byte array.
static double	swapDouble(double v) Returns the double resulting from reversing 8 bytes of a specified double.
static float	swapFloat(byte[] b, int offset) Returns the float resulting from reversing 4 bytes at a specified offset in a byte array.
static float	swapFloat(float v) Returns the float resulting from reversing 4 bytes of a specified float.
static int	swapInt(byte[] b, int offset) Returns the int resulting from reversing 4 bytes at a specified offset in a byte array.
static int	swapInt(int v) Returns the int resulting from reversing 4 bytes of a specified int.
static long	swapLong(byte[] b, int offset) Returns the long resulting from reversing 8 bytes at a specified offset in a byte array.
static long	swapLong(long l) Returns the long resulting from reversing 8 bytes of a specified long.
static short	swapShort(byte[] b, int offset) Returns the short resulting from swapping 2 bytes at a specified offset in a byte array.
static short	swapShort(short s) Returns the short resulting from swapping 2 bytes of a specified short.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Swap

public Swap()

Method Detail

swapShort

public static short swapShort(byte[] b,
              int offset)

Returns the short resulting from swapping 2 bytes at a specified offset in a byte array.

Parameters:

b - the byte array

offset - the offset of the first byte

Returns:

the short represented by the bytes b[offset+1], b[offset]

swapInt

public static int swapInt(byte[] b,
          int offset)

Returns the int resulting from reversing 4 bytes at a specified offset in a byte array.

Parameters:

b - the byte array

offset - the offset of the first byte

Returns:

the int represented by the bytes b[offset+3], b[offset+2], ..., b[offset]

swapLong

public static long swapLong(byte[] b,
            int offset)

Returns the long resulting from reversing 8 bytes at a specified offset in a byte array.

Parameters:

b - the byte array

offset - the offset of the first byte

Returns:

the long represented by the bytes b[offset+7], b[offset+6], ..., b[offset]

swapFloat

public static float swapFloat(byte[] b,
              int offset)

Returns the float resulting from reversing 4 bytes at a specified offset in a byte array.

Parameters:

b - the byte array

offset - the offset of the first byte

Returns:

the float represented by the bytes b[offset+3], b[offset+2], ..., b[offset]

swapDouble

public static double swapDouble(byte[] b,
                int offset)

Returns the double resulting from reversing 8 bytes at a specified offset in a byte array.

Parameters:

b - the byte array

offset - the offset of the first byte

Returns:

the double represented by the bytes b[offset+7], b[offset+6], ..., b[offset]

swapChar

public static char swapChar(byte[] b,
            int offset)

Returns the char resulting from swapping 2 bytes at a specified offset in a byte array.

Parameters:

b - the byte array

offset - the offset of the first byte

Returns:

the char represented by the bytes b[offset+1], b[offset]

swapShort

public static short swapShort(short s)

Returns the short resulting from swapping 2 bytes of a specified short.

Parameters:

s - input value for which byte reversal is desired

Returns:

the value represented by the bytes of s reversed

swapInt

public static int swapInt(int v)

Returns the int resulting from reversing 4 bytes of a specified int.

Parameters:

v - input value for which byte reversal is desired

Returns:

the value represented by the bytes of v reversed

swapLong

public static long swapLong(long l)

Returns the long resulting from reversing 8 bytes of a specified long.

Parameters:

l - input value for which byte reversal is desired

Returns:

the value represented by the bytes of l reversed

swapFloat

public static float swapFloat(float v)

Returns the float resulting from reversing 4 bytes of a specified float.

Parameters:

v - input value for which byte reversal is desired

Returns:

the value represented by the bytes of v reversed

swapDouble

public static double swapDouble(double v)

Returns the double resulting from reversing 8 bytes of a specified double.

Parameters:

v - input value for which byte reversal is desired

Returns:

the value represented by the bytes of v reversed

shortToBytes

public static byte[] shortToBytes(short v)

Convert a short to an array of 2 bytes.

Parameters:

v - input value

Returns:

the corresponding array of bytes

intToBytes

public static byte[] intToBytes(int v)

Convert an int to an array of 4 bytes.

Parameters:

v - input value

Returns:

the corresponding array of bytes

longToBytes

public static byte[] longToBytes(long v)

Convert a long to an array of 8 bytes.

Parameters:

v - input value

Returns:

the corresponding array of bytes