edu.harvard.deas.hyperenc.util
Class HexCoder

java.lang.Object
  edu.harvard.deas.hyperenc.util.HexCoder

public class HexCoder
extends Object

Converts byte sequences into hex strings.

Constructor Summary

HexCoder()

Method Summary

static byte[]	decode(String data) Decodes the hex string data and returns the corresponding bytes.
static String	encode(byte[] data) Encodes data as a hex string.

Methods inherited from class java.lang.Object

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

Constructor Detail

HexCoder

public HexCoder()

Method Detail

encode

public static String encode(byte[] data)

Encodes data as a hex string. data[0] comes first in the string, followed by the others in order. Each byte is encoded as specified by Integer.toHexString(int), except padded with a leading zero as necessary so that each byte is represented by two characters. The length of the string is thus exactly 2*data.length.

Parameters:

data - An array of bytes. May not be null.

Returns:

The hex encoding of data.

decode

public static byte[] decode(String data)

Decodes the hex string data and returns the corresponding bytes. The returned array has size data.length()/2; data must have even length, and only contain characters 0-9 and a-f.

Parameters:

data - A hex-encoded string.

Returns:

The byte array encoded by data.

Throws:

IllegalArgumentException - if data does not have even length, or if data contains an invalid character (one other than 0-9 or a-f)