Class SnapPacket.SnapHeader

java.lang.Object

org.pcap4j.packet.AbstractPacket.AbstractHeader

org.pcap4j.packet.SnapPacket.SnapHeader

All Implemented Interfaces:

Serializable, Packet.Header

Enclosing class:

SnapPacket

public static final class SnapPacket.SnapHeader
extends AbstractPacket.AbstractHeader

SNAP (Subnetwork Access Protocol) Header

  0                           7
+---+---+---+---+---+---+---+---+
|                               |
+                               +
|            OUI                |
+                               +
|                               |
+---+---+---+---+---+---+---+---+
|                               |
+        Protocol ID            +
|                               |
+---+---+---+---+---+---+---+---+

Since:

pcap4j 1.6.5

See Also:

• IEEE 802
• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
private final Oui	oui
private static final int	OUI_OFFSET
private static final int	OUI_SIZE
private static final int	PROTOCOL_ID_OFFSET
private static final int	PROTOCOL_ID_SIZE
private final EtherType	protocolId
private static final long	serialVersionUID
private static final int	SNAP_HEADER_SIZE

Constructor Summary

Constructors

Modifier	Constructor	Description
private	SnapHeader(byte[] rawData, int offset, int length)
private	SnapHeader(SnapPacket.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.
boolean	equals(Object obj)	Indicates whether some other object is "equal to" this one using return values of getRawData().
Oui	getOui()
EtherType	getProtocolId()
protected List<byte[]>	getRawFields()	Returns a list of byte arrays which represents this header's fields.
int	length()	Returns the header length in bytes.

Methods inherited from class AbstractPacket.AbstractHeader

buildHexString, buildRawData, calcLength, getRawData, hashCode, toHexString, toString

Methods inherited from class Object

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

Field Details

serialVersionUID

private static final long serialVersionUID

See Also:

• Constant Field Values

OUI_OFFSET

private static final int OUI_OFFSET

See Also:

• Constant Field Values

OUI_SIZE

private static final int OUI_SIZE

See Also:

• Constant Field Values

PROTOCOL_ID_OFFSET

private static final int PROTOCOL_ID_OFFSET

See Also:

• Constant Field Values

PROTOCOL_ID_SIZE

private static final int PROTOCOL_ID_SIZE

See Also:

• Constant Field Values

SNAP_HEADER_SIZE

private static final int SNAP_HEADER_SIZE

See Also:

• Constant Field Values

oui

private final Oui oui

protocolId

private final EtherType protocolId

Constructor Details

SnapHeader

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

Throws:

IllegalRawDataException

SnapHeader

private SnapHeader(SnapPacket.Builder builder)

Method Details

getOui

public Oui getOui()

Returns:

oui

getProtocolId

public EtherType getProtocolId()

Returns:

protocolId

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

length

public int length()

Description copied from class: AbstractPacket.AbstractHeader

Returns the header length in bytes. This method calls calcLength() and caches the return value when it is called for the first time, and then, this method returns the cached value from the second time.

Specified by:

length in interface Packet.Header

Overrides:

length in class AbstractPacket.AbstractHeader

Returns:

the length of the byte stream of the header represented by this object in bytes

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