cryptix.util.core

Class ArrayUtil

java.lang.Object

cryptix.util.core.ArrayUtil

public class ArrayUtil
extends java.lang.Object

Static methods for converting between arrays of various types, for clearing all or part of a byte array, and for comparing two byte arrays.

Copyright © 1997 Systemics Ltd on behalf of the Cryptix Development Team.
All rights reserved.

$Revision: 1.6 $

Since:

Cryptix 2.2.2

Author:

Raif Naffah, David Hopwood, Ian Brown

Method Summary

Modifier and Type	Method and Description
static boolean	areEqual(byte[] a, byte[] b) Compares two byte arrays for equality.
static boolean	areEqual(int[] a, int[] b) Compares two int arrays for equality.
static void	clear(byte[] buf) Clears a byte array to all-zeroes.
static void	clear(byte[] buf, int offset, int length) Clears length bytes of a byte array to zeroes, starting at offset.
static int	compared(byte[] a, byte[] b, boolean msbFirst)
static boolean	isText(byte[] buffer)
static byte[]	toBytes(int n) Returns a 4-byte array built from an int.
static byte[]	toBytes(short[] array)
static byte[]	toBytes(short[] array, int offset, int length) Returns a byte array built from a short array.
static int	toInt(short s0, short s1) Returns an int built from two shorts.
static short	toShort(byte b0, byte b1) Returns a short built from two bytes.
static short[]	toShorts(byte[] array)
static short[]	toShorts(byte[] array, int offset, int length) Returns a short array built from a byte array.

Methods inherited from class java.lang.Object

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

Method Detail

clear

public static void clear(byte[] buf)

Clears a byte array to all-zeroes.

clear

public static void clear(byte[] buf,
                         int offset,
                         int length)

Clears length bytes of a byte array to zeroes, starting at offset.

toInt

public static int toInt(short s0,
                        short s1)

Returns an int built from two shorts.

Parameters:

s0 - the least significant short

s1 - the most significant short

toShort

public static short toShort(byte b0,
                            byte b1)

Returns a short built from two bytes.

Parameters:

b0 - the least significant byte

b1 - the most significant byte

toBytes

public static byte[] toBytes(int n)

Returns a 4-byte array built from an int. The int's MSB is first (big-endian order).

toBytes

public static byte[] toBytes(short[] array,
                             int offset,
                             int length)

Returns a byte array built from a short array. Each short is broken into 2 bytes with the short's MSB first (big-endian order).

If offset and length are omitted, the whole array is used.

toBytes

public static byte[] toBytes(short[] array)

toShorts

public static short[] toShorts(byte[] array,
                               int offset,
                               int length)

Returns a short array built from a byte array. Each 2 bytes form a short with the first byte as the short's MSB (big-endian order).

If offset and length are omitted, the whole array is used.

toShorts

public static short[] toShorts(byte[] array)

areEqual

public static boolean areEqual(byte[] a,
                               byte[] b)

Compares two byte arrays for equality.

Returns:

true if the arrays have identical contents

areEqual

public static boolean areEqual(int[] a,
                               int[] b)

Compares two int arrays for equality.

Returns:

true if the arrays have identical contents

compared

public static int compared(byte[] a,
                           byte[] b,
                           boolean msbFirst)

isText

public static boolean isText(byte[] buffer)

Returns:

true If the data in the byte array consists of just text.