Package sg.dex.starfish.util

Class Hex

java.lang.Object

sg.dex.starfish.util.Hex

public class Hex
extends Object

Utility class for hexadecimal strings

Author:

Mike

Constructor Summary

Constructors

Constructor	Description
Hex()

Method Summary

Modifier and Type	Method	Description
static byte[]	toBytes(String hex)	Converts a hex string to a byte array.
static char	toChar(int value)	Converts an int value in the range 0..15 to a lowercase hexadecimal character
static String	toString(byte[] data)	Converts a byte array of length N to a hex string of length 2N
static String	toString(byte[] data, int offset, int length)	Converts a byte array of length N to a hex string of length 2N
static String	toString(int value)	Converts an int to its 8-character hex representation
static int	val(char c)	Gets the value of a single hex car e.g.

Methods inherited from class java.lang.Object

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

Constructor Detail

Hex

public Hex()

Method Detail

toChar

public static char toChar(int value)

Converts an int value in the range 0..15 to a lowercase hexadecimal character

Parameters:

value - Integer value to convert

Returns:

The lowercase hex character

Throws:

IllegalArgumentException - on invalid hex char

toBytes

public static byte[] toBytes(String hex)

Converts a hex string to a byte array. The hex string must have an even number of digits.

Parameters:

hex - String containing Hex digits

Returns:

The representation of the hex string as a byte array

Throws:

Error - on odd length hex string

val

public static int val(char c)

Gets the value of a single hex car e.g. val('c') => 12

Parameters:

c - Character to convert

Returns:

The int value of the hex char, in the range 0-15 inclusive

Throws:

Error - on invalid hex char

toString

public static String toString(byte[] data)

Converts a byte array of length N to a hex string of length 2N

Parameters:

data - Array of bytes

Returns:

The lowercase hex string generated

toString

public static String toString(byte[] data,
                              int offset,
                              int length)

Converts a byte array of length N to a hex string of length 2N

Parameters:

data - Array of bytes

offset - Offset into the byte array to start

length - Number of bytes from the byte array to convert to hex

Returns:

The lowercase hex string generated

toString

public static String toString(int value)

Converts an int to its 8-character hex representation

Parameters:

value - int to convert to hex

Returns:

hex representation