org.apache.directory.shared.asn1.ber
Class Asn1Decoder

java.lang.Object
  org.apache.directory.shared.asn1.ber.Asn1Decoder

All Implemented Interfaces:

ITLVBerDecoderMBean

public class Asn1Decoder
extends java.lang.Object
implements ITLVBerDecoderMBean

A BER TLV Tag component decoder. This decoder instanciate a Tag. The tag won't be implementations should not copy the handle to the Tag object delivered but should copy the data if they need it over the long term.

Version:

$Rev: 725712 $, $Date: 2008-12-11 16:32:04 +0100 (Jeu, 11 déc 2008) $

Author:

Apache Directory Project

Constructor Summary

Asn1Decoder()
A public constructor of an Asn1 Decoder.

Method Summary

void	allowIndefiniteLength() Allow indefinite length.
void	decode(java.nio.ByteBuffer stream, IAsn1Container container) The decoder main function.
void	disallowIndefiniteLength() Disallow indefinite length.
int	getMaxLengthLength() Get the length's Length.
int	getMaxTagLength() Get the maximum Tag's length
boolean	isIndefiniteLengthAllowed() Tells if indefinite length form could be used for Length
void	setMaxLengthLength(int maxLengthLength) Set the maximul length for a Length
void	setMaxTagLength(int maxTagLength) Set the maximum Tag length

Methods inherited from class java.lang.Object

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

Constructor Detail

Asn1Decoder

public Asn1Decoder()

A public constructor of an Asn1 Decoder.

Method Detail

decode

public void decode(java.nio.ByteBuffer stream,
                   IAsn1Container container)
            throws DecoderException

The decoder main function. This is where we read bytes from the stream and go through the automaton. It's an inifnite loop which stop when no more bytes are to be read. It can occurs if the ByteBuffer is exhausted or if the PDU has been fully decoded.

Parameters:

stream - The ByteBuffer containing the PDU to decode

container - The container that store the state, the result and other elements.

Throws:

DecoderException - Thrown if anything went wrong!

getMaxLengthLength

public int getMaxLengthLength()

Get the length's Length.

Specified by:

getMaxLengthLength in interface ITLVBerDecoderMBean

Returns:

Returns the length's Length.

getMaxTagLength

public int getMaxTagLength()

Get the maximum Tag's length

Specified by:

getMaxTagLength in interface ITLVBerDecoderMBean

Returns:

Returns the maximum tag Length.

disallowIndefiniteLength

public void disallowIndefiniteLength()

Disallow indefinite length.

Specified by:

disallowIndefiniteLength in interface ITLVBerDecoderMBean

allowIndefiniteLength

public void allowIndefiniteLength()

Allow indefinite length.

Specified by:

allowIndefiniteLength in interface ITLVBerDecoderMBean

isIndefiniteLengthAllowed

public boolean isIndefiniteLengthAllowed()

Tells if indefinite length form could be used for Length

Specified by:

isIndefiniteLengthAllowed in interface ITLVBerDecoderMBean

Returns:

Returns true if the current decoder support indefinite length

setMaxLengthLength

public void setMaxLengthLength(int maxLengthLength)
                        throws DecoderException

Set the maximul length for a Length

Specified by:

setMaxLengthLength in interface ITLVBerDecoderMBean

Parameters:

maxLengthLength - The lengthLength to set.

Throws:

DecoderException - Thrown if the indefinite length is allowed or if the length's Length is above 126 bytes

setMaxTagLength

public void setMaxTagLength(int maxTagLength)

Set the maximum Tag length

Specified by:

setMaxTagLength in interface ITLVBerDecoderMBean

Parameters:

maxTagLength - The tagLength to set.