org.apache.tomcat.util.buf
Class HexUtils

java.lang.Object
  org.apache.tomcat.util.buf.HexUtils

public final class HexUtils

extends java.lang.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.

Constructor Summary

HexUtils()

Method Summary

static java.lang.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(java.lang.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.

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

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(java.lang.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:

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

convert

public static java.lang.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:

java.lang.IllegalArgumentException - if an invalid hexadecimal digit is included