Class RadiotapPacket.RadiotapHeader

java.lang.Object

org.pcap4j.packet.AbstractPacket.AbstractHeader

org.pcap4j.packet.RadiotapPacket.RadiotapHeader

All Implemented Interfaces:

Serializable, Packet.Header

Enclosing class:

RadiotapPacket

public static final class RadiotapPacket.RadiotapHeader
extends AbstractPacket.AbstractHeader

Radiotap Header + Extended presence masks + Radiotap fields

struct ieee80211_radiotap_header {
        u_int8_t        it_version; // currently, this is always 0
        u_int8_t        it_pad;     // currently unused, just for for the alignment
        u_int16_t       it_len;     // entire length
        u_int32_t       it_present; // presence mask
} __attribute__((__packed__));

Since:

pcap4j 1.6.5

See Also:

• Radiotap
• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
private final List<RadiotapPacket.RadiotapData>	dataFields
private final short	length
private static final int	LENGTH_OFFSET
private static final int	LENGTH_SIZE
private static final int	MIN_RADIOTAP_HEADER_SIZE
private final byte	pad
private static final int	PAD_OFFSET
private static final int	PAD_SIZE
private static final int	PRESENT_OFFSET
private static final int	PRESENT_SIZE
private final List<RadiotapPresentBitmask>	presentBitmasks
private static final long	serialVersionUID
private final byte	version
private static final int	VERSION_OFFSET
private static final int	VERSION_SIZE

Constructor Summary

Constructors

Modifier	Constructor	Description
private	RadiotapHeader(byte[] rawData, int offset, int length)
private	RadiotapHeader(RadiotapPacket.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.
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().
ArrayList<RadiotapPacket.RadiotapData>	getDataFields()
short	getLength()
int	getLengthAsInt()
byte	getPad()
ArrayList<RadiotapPresentBitmask>	getPresentBitmasks()
protected List<byte[]>	getRawFields()	Returns a list of byte arrays which represents this header's fields.
byte	getVersion()
int	getVersionAsInt()

Methods inherited from class AbstractPacket.AbstractHeader

buildHexString, buildRawData, getRawData, hashCode, length, 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

VERSION_OFFSET

private static final int VERSION_OFFSET

See Also:

• Constant Field Values

VERSION_SIZE

private static final int VERSION_SIZE

See Also:

• Constant Field Values

PAD_OFFSET

private static final int PAD_OFFSET

See Also:

• Constant Field Values

PAD_SIZE

private static final int PAD_SIZE

See Also:

• Constant Field Values

LENGTH_OFFSET

private static final int LENGTH_OFFSET

See Also:

• Constant Field Values

LENGTH_SIZE

private static final int LENGTH_SIZE

See Also:

• Constant Field Values

PRESENT_OFFSET

private static final int PRESENT_OFFSET

See Also:

• Constant Field Values

PRESENT_SIZE

private static final int PRESENT_SIZE

See Also:

• Constant Field Values

MIN_RADIOTAP_HEADER_SIZE

private static final int MIN_RADIOTAP_HEADER_SIZE

See Also:

• Constant Field Values

version

private final byte version

pad

private final byte pad

length

private final short length

presentBitmasks

private final List<RadiotapPresentBitmask> presentBitmasks

dataFields

private final List<RadiotapPacket.RadiotapData> dataFields

Constructor Details

RadiotapHeader

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

Throws:

IllegalRawDataException

RadiotapHeader

private RadiotapHeader(RadiotapPacket.Builder builder)

Method Details

getVersion

public byte getVersion()

Returns:

version

getVersionAsInt

public int getVersionAsInt()

Returns:

version

getPad

public byte getPad()

Returns:

pad

getLength

public short getLength()

Returns:

length

getLengthAsInt

public int getLengthAsInt()

Returns:

length

getPresentBitmasks

public ArrayList<RadiotapPresentBitmask> getPresentBitmasks()

Returns:

presentBitmasks

getDataFields

public ArrayList<RadiotapPacket.RadiotapData> getDataFields()

Returns:

dataFields

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

public 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