com.cafesoft.core.util
Class HexUtils

java.lang.Object
  com.cafesoft.core.util.HexUtils

public final class HexUtils
extends Object

Library of utility methods useful in dealing with converting byte arrays to and from strings of hexadecimal digits.

Field Summary

static int[]

DEC

Constructor Summary

HexUtils()

Method Summary

static String	convert(byte[] bytes) Convert a byte array into a printable format containing a String of hexadecimal digit characters (two per byte).
static byte[]	convert(String digits) Convert a String of hexadecimal digits into the corresponding byte array by encoding each two hexadecimal digits as a byte.
static int	convert2Int(byte[] hex) Convert 4 hex digits to an int, and return the number of converted bytes.
static boolean	isHexDigit(char ch) Determine if character is a valid hex digit or not.

Methods inherited from class java.lang.Object

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

Field Detail

DEC

public static final int[] DEC

Constructor Detail

HexUtils

public HexUtils()

Method Detail

convert

public static byte[] convert(String digits)

Convert a String of hexadecimal digits into the corresponding byte array by encoding each two hexadecimal digits as a byte.

Parameters:

digits - Hexadecimal digits representation

Throws:

IllegalArgumentException - if an invalid hexadecimal digit is found, or the input string contains an odd number of hexadecimal digits

convert

public static String convert(byte[] bytes)

Convert a byte array into a printable format containing a String of hexadecimal digit characters (two per byte).

Parameters:

bytes - Byte array representation

convert2Int

public static int convert2Int(byte[] hex)

Convert 4 hex digits to an int, and return the number of converted bytes.

Parameters:

hex - Byte array containing exactly four hexadecimal digits

Throws:

IllegalArgumentException - if an invalid hexadecimal digit is included

isHexDigit

public static final boolean isHexDigit(char ch)

Determine if character is a valid hex digit or not.

A valid hex digit satisfies the following requirements:

the character is a digit (0..9)

the character is a lowercase a,b,c,d,e,f

the character is a uppercase A,B,C,D,E,F

Parameters:

ch - the character to test

Returns:

return true if the character is a hex digit, false otherwise