org.cryptacular.codec

Class HexDecoder

java.lang.Object

org.cryptacular.codec.HexDecoder

All Implemented Interfaces:

Decoder

public class HexDecoder
extends java.lang.Object
implements Decoder

Stateful hexadecimal character-to-byte decoder.

Field Summary

Fields

Modifier and Type	Field and Description
private int	count Number of encoded characters processed.
private static byte[]	DECODING_TABLE Hex character decoding table.

Constructor Summary

Constructors

Constructor and Description
HexDecoder()

Method Summary

Modifier and Type	Method and Description
void	decode(java.nio.CharBuffer input, java.nio.ByteBuffer output) Decodes characters in input buffer into bytes placed in the output buffer.
void	finalize(java.nio.ByteBuffer output) Performs final output decoding (e.g.
private static byte	lookup(char c) Looks up the byte that corresponds to the given character.
int	outputSize(int inputSize) Expected number of bytes in the output buffer for an input buffer of the given size.

Methods inherited from class java.lang.Object

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

Field Detail

DECODING_TABLE

private static final byte[] DECODING_TABLE

Hex character decoding table.

count

private int count

Number of encoded characters processed.

Constructor Detail

HexDecoder

public HexDecoder()

Method Detail

decode

public void decode(java.nio.CharBuffer input,
                   java.nio.ByteBuffer output)
            throws EncodingException

Description copied from interface: Decoder

Decodes characters in input buffer into bytes placed in the output buffer. This method may be called multiple times, followed by Decoder.finalize(ByteBuffer). after all input bytes have been provided.

Specified by:

decode in interface Decoder

Parameters:

input - Input character buffer.

output - Output byte buffer.

Throws:

EncodingException - on decoding errors.

finalize

public void finalize(java.nio.ByteBuffer output)
              throws EncodingException

Description copied from interface: Decoder

Performs final output decoding (e.g. padding) after all input characters have been provided.

Specified by:

finalize in interface Decoder

Parameters:

output - Output byte buffer.

Throws:

EncodingException - on decoding errors.

outputSize

public int outputSize(int inputSize)

Description copied from interface: Decoder

Expected number of bytes in the output buffer for an input buffer of the given size.

Specified by:

outputSize in interface Decoder

Parameters:

inputSize - Size of input buffer in characters.

Returns:

Minimum byte buffer size required to store all decoded characters in input buffer.

lookup

private static byte lookup(char c)

Looks up the byte that corresponds to the given character.

Parameters:

c - Encoded character.

Returns:

Decoded byte.