org.glassfish.grizzly.http.util
Class HexUtils

java.lang.Object
  org.glassfish.grizzly.http.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. Code from Ajp11, from Apache's JServ.

Author:

Craig R. McClanahan

Field Summary

static int[]	DEC Table for HEX to DEC byte translation.
static byte[]	HEX Table for DEC to HEX byte translation.
static boolean[]	IS_HEX_DIGIT Table "isHexDigit".

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 int	hexDigit2Dec(byte hexDigit)
static int	hexDigit2Dec(int hexDigit)
static boolean	isHexDigit(byte c)
static boolean	isHexDigit(int c)

Methods inherited from class java.lang.Object

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

Field Detail

IS_HEX_DIGIT

public static final boolean[] IS_HEX_DIGIT

Table "isHexDigit".

DEC

public static final int[] DEC

Table for HEX to DEC byte translation.

HEX

public static final byte[] HEX

Table for DEC to HEX byte translation.

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 boolean isHexDigit(byte c)

isHexDigit

public static boolean isHexDigit(int c)

hexDigit2Dec

public static int hexDigit2Dec(byte hexDigit)

hexDigit2Dec

public static int hexDigit2Dec(int hexDigit)