Module org.pcap4j.core

Package org.pcap4j.packet

Class LlcPacket.LlcHeader

java.lang.Object

org.pcap4j.packet.AbstractPacket.AbstractHeader

org.pcap4j.packet.LlcPacket.LlcHeader

All Implemented Interfaces:

Serializable, Packet.Header

Enclosing class:

LlcPacket

public static final class LlcPacket.LlcHeader
extends AbstractPacket.AbstractHeader

LLC (Logical Link Control) Header

   0                                                          15
 +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
 |           DSAP ( 8bits)       |       SSAP (8 bits)           |
 +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
 |                    Control (8 or 16 bits)                     |
 +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
 

Since:

pcap4j 1.6.5

See Also:

• IEEE 802.2
• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
private final LlcPacket.LlcControl	control
private static final int	CONTROL_OFFSET
private final LlcNumber	dsap
private static final int	DSAP_OFFSET
private static final int	DSAP_SIZE
private static final long	serialVersionUID
private final LlcNumber	ssap
private static final int	SSAP_OFFSET
private static final int	SSAP_SIZE

Constructor Summary

Constructors

Modifier	Constructor	Description
private	LlcHeader(byte[] rawData, int offset, int length)
private	LlcHeader(LlcPacket.Builder builder)

Method Summary

Modifier and Type	Method	Description
protected String	buildString()	This method builds the value toString() will return.
protected int	calcHashCode()	This method builds the value hashCode() will return using the byte array getRawData() returns.
protected int	calcLength()	This method calculates the value length() will return by adding up the lengths of byte arrays in the list getRawFields() returns.
boolean	equals(Object obj)	Indicates whether some other object is "equal to" this one using return values of getRawData().
LlcPacket.LlcControl	getControl()
LlcNumber	getDsap()
protected List<byte[]>	getRawFields()	Returns a list of byte arrays which represents this header's fields.
LlcNumber	getSsap()

Methods inherited from class org.pcap4j.packet.AbstractPacket.AbstractHeader

buildHexString, buildRawData, getRawData, hashCode, length, toHexString, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Details

serialVersionUID

private static final long serialVersionUID

See Also:

• Constant Field Values

DSAP_OFFSET

private static final int DSAP_OFFSET

See Also:

• Constant Field Values

DSAP_SIZE

private static final int DSAP_SIZE

See Also:

• Constant Field Values

SSAP_OFFSET

private static final int SSAP_OFFSET

See Also:

• Constant Field Values

SSAP_SIZE

private static final int SSAP_SIZE

See Also:

• Constant Field Values

CONTROL_OFFSET

private static final int CONTROL_OFFSET

See Also:

• Constant Field Values

dsap

private final LlcNumber dsap

ssap

private final LlcNumber ssap

control

private final LlcPacket.LlcControl control

Constructor Details

LlcHeader

private LlcHeader(byte[] rawData,
 int offset,
 int length)
           throws IllegalRawDataException

Throws:

IllegalRawDataException

LlcHeader

private LlcHeader(LlcPacket.Builder builder)

Method Details

getDsap

public LlcNumber getDsap()

Returns:

dsap

getSsap

public LlcNumber getSsap()

Returns:

ssap

getControl

public LlcPacket.LlcControl getControl()

Returns:

an instance of LlcControlInformation, LlcControlSupervisory or LlcControlUnnumbered.

getRawFields

protected List<byte[]> getRawFields()

Description copied from class: AbstractPacket.AbstractHeader

Returns a list of byte arrays which represents this header's fields. This method is called by calcLength() and buildRawData().

Specified by:

getRawFields in class AbstractPacket.AbstractHeader

Returns:

a list of byte arrays which represents this header's fields

calcLength

protected int calcLength()

Description copied from class: AbstractPacket.AbstractHeader

This method calculates the value length() will return by adding up the lengths of byte arrays in the list getRawFields() returns.

Overrides:

calcLength in class AbstractPacket.AbstractHeader

Returns:

a calculated length

buildString

protected String buildString()

Description copied from class: AbstractPacket.AbstractHeader

This method builds the value toString() will return.

Overrides:

buildString in class AbstractPacket.AbstractHeader

Returns:

a string representation of this object

equals

public boolean equals(Object obj)

Description copied from class: AbstractPacket.AbstractHeader

Indicates whether some other object is "equal to" this one using return values of getRawData(). This method should be overridden so that it does more strict comparisons more efficiently.

Overrides:

equals in class AbstractPacket.AbstractHeader

calcHashCode

protected int calcHashCode()

Description copied from class: AbstractPacket.AbstractHeader

This method builds the value hashCode() will return using the byte array getRawData() returns. This method may be better to be overridden for performance reason.

Overrides:

calcHashCode in class AbstractPacket.AbstractHeader

Returns:

a calculated hash code value for the object