java.lang.Object
- org.pcap4j.packet.AbstractPacket.AbstractHeader
- - org.pcap4j.packet.TcpPacket.TcpHeader

All Implemented Interfaces:

java.io.Serializable, Packet.Header, TransportPacket.TransportHeader

Enclosing class:

TcpPacket
```
public static final class TcpPacket.TcpHeader
extends AbstractPacket.AbstractHeader
implements TransportPacket.TransportHeader
```
Since:

pcap4j 0.9.12

See Also:

Serialized Form

Field Summary

Fields
Modifier and Type	Field	Description
`private boolean`	`ack`
`private static int`	`ACKNOWLEDGMENT_NUMBER_OFFSET`
`private static int`	`ACKNOWLEDGMENT_NUMBER_SIZE`
`private int`	`acknowledgmentNumber`
`private short`	`checksum`
`private static int`	`CHECKSUM_OFFSET`
`private static int`	`CHECKSUM_SIZE`
`private static int`	`DATA_OFFSET_AND_RESERVED_AND_CONTROL_BITS_OFFSET`
`private static int`	`DATA_OFFSET_AND_RESERVED_AND_CONTROL_BITS_SIZE`
`private byte`	`dataOffset`
`private static int`	`DST_PORT_OFFSET`
`private static int`	`DST_PORT_SIZE`
`private TcpPort`	`dstPort`
`private boolean`	`fin`
`private static int`	`IPV4_PSEUDO_HEADER_SIZE`
`private static int`	`IPV6_PSEUDO_HEADER_SIZE`
`private static org.slf4j.Logger`	`logger`
`private static int`	`MIN_TCP_HEADER_SIZE`
`private java.util.List<TcpPacket.TcpOption>`	`options`
`private static int`	`OPTIONS_OFFSET`
`private byte[]`	`padding`
`private boolean`	`psh`
`private byte`	`reserved`
`private boolean`	`rst`
`private static int`	`SEQUENCE_NUMBER_OFFSET`
`private static int`	`SEQUENCE_NUMBER_SIZE`
`private int`	`sequenceNumber`
`private static long`	`serialVersionUID`
`private static int`	`SRC_PORT_OFFSET`
`private static int`	`SRC_PORT_SIZE`
`private TcpPort`	`srcPort`
`private boolean`	`syn`
`private boolean`	`urg`
`private static int`	`URGENT_POINTER_OFFSET`
`private static int`	`URGENT_POINTER_SIZE`
`private short`	`urgentPointer`
`private short`	`window`
`private static int`	`WINDOW_OFFSET`
`private static int`	`WINDOW_SIZE`

Constructor Summary

Constructors
Modifier	Constructor	Description
`private`	`TcpHeader(byte[] rawData, int offset, int length)`
`private`	`TcpHeader(TcpPacket.Builder builder, byte[] payload)`

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`private byte[]`	`buildRawData(boolean zeroInsteadOfChecksum)`
`protected java.lang.String`	`buildString()`	This method builds the value `toString()` will return.
`private short`	`calcChecksum(java.net.InetAddress srcAddr, java.net.InetAddress dstAddr, byte[] header, byte[] payload)`
`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(java.lang.Object obj)`	Indicates whether some other object is "equal to" this one using return values of `getRawData()`.
`boolean`	`getAck()`
`int`	`getAcknowledgmentNumber()`
`long`	`getAcknowledgmentNumberAsLong()`
`short`	`getChecksum()`
`byte`	`getDataOffset()`
`int`	`getDataOffsetAsInt()`
`TcpPort`	`getDstPort()`
`boolean`	`getFin()`
`java.util.List<TcpPacket.TcpOption>`	`getOptions()`
`byte[]`	`getPadding()`
`boolean`	`getPsh()`
`protected java.util.List<byte[]>`	`getRawFields()`	Returns a list of byte arrays which represents this header's fields.
`private java.util.List<byte[]>`	`getRawFields(boolean zeroInsteadOfChecksum)`
`byte`	`getReserved()`
`boolean`	`getRst()`
`int`	`getSequenceNumber()`
`long`	`getSequenceNumberAsLong()`
`TcpPort`	`getSrcPort()`
`boolean`	`getSyn()`
`boolean`	`getUrg()`
`short`	`getUrgentPointer()`
`int`	`getUrgentPointerAsInt()`
`short`	`getWindow()`
`int`	`getWindowAsInt()`
`private int`	`measureLengthWithoutPadding()`

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

Methods inherited from interface org.pcap4j.packet.Packet.Header
getRawData, length

- Field Detail
  - logger
```
private static final org.slf4j.Logger logger
```
  - serialVersionUID
```
private static final long serialVersionUID
```
    See Also:
    
    Constant Field Values
  - SRC_PORT_OFFSET
```
private static final int SRC_PORT_OFFSET
```
    See Also:
    
    Constant Field Values
  - SRC_PORT_SIZE
```
private static final int SRC_PORT_SIZE
```
    See Also:
    
    Constant Field Values
  - DST_PORT_OFFSET
```
private static final int DST_PORT_OFFSET
```
    See Also:
    
    Constant Field Values
  - DST_PORT_SIZE
```
private static final int DST_PORT_SIZE
```
    See Also:
    
    Constant Field Values
  - SEQUENCE_NUMBER_OFFSET
```
private static final int SEQUENCE_NUMBER_OFFSET
```
    See Also:
    
    Constant Field Values
  - SEQUENCE_NUMBER_SIZE
```
private static final int SEQUENCE_NUMBER_SIZE
```
    See Also:
    
    Constant Field Values
  - ACKNOWLEDGMENT_NUMBER_OFFSET
```
private static final int ACKNOWLEDGMENT_NUMBER_OFFSET
```
    See Also:
    
    Constant Field Values
  - ACKNOWLEDGMENT_NUMBER_SIZE
```
private static final int ACKNOWLEDGMENT_NUMBER_SIZE
```
    See Also:
    
    Constant Field Values
  - DATA_OFFSET_AND_RESERVED_AND_CONTROL_BITS_OFFSET
```
private static final int DATA_OFFSET_AND_RESERVED_AND_CONTROL_BITS_OFFSET
```
    See Also:
    
    Constant Field Values
  - DATA_OFFSET_AND_RESERVED_AND_CONTROL_BITS_SIZE
```
private static final int DATA_OFFSET_AND_RESERVED_AND_CONTROL_BITS_SIZE
```
    See Also:
    
    Constant Field Values
  - WINDOW_OFFSET
```
private static final int WINDOW_OFFSET
```
    See Also:
    
    Constant Field Values
  - WINDOW_SIZE
```
private static final int WINDOW_SIZE
```
    See Also:
    
    Constant Field Values
  - CHECKSUM_OFFSET
```
private static final int CHECKSUM_OFFSET
```
    See Also:
    
    Constant Field Values
  - CHECKSUM_SIZE
```
private static final int CHECKSUM_SIZE
```
    See Also:
    
    Constant Field Values
  - URGENT_POINTER_OFFSET
```
private static final int URGENT_POINTER_OFFSET
```
    See Also:
    
    Constant Field Values
  - URGENT_POINTER_SIZE
```
private static final int URGENT_POINTER_SIZE
```
    See Also:
    
    Constant Field Values
  - OPTIONS_OFFSET
```
private static final int OPTIONS_OFFSET
```
    See Also:
    
    Constant Field Values
  - MIN_TCP_HEADER_SIZE
```
private static final int MIN_TCP_HEADER_SIZE
```
    See Also:
    
    Constant Field Values
  - IPV4_PSEUDO_HEADER_SIZE
```
private static final int IPV4_PSEUDO_HEADER_SIZE
```
    See Also:
    
    Constant Field Values
  - IPV6_PSEUDO_HEADER_SIZE
```
private static final int IPV6_PSEUDO_HEADER_SIZE
```
    See Also:
    
    Constant Field Values
  - srcPort
```
private final TcpPort srcPort
```
  - dstPort
```
private final TcpPort dstPort
```
  - sequenceNumber
```
private final int sequenceNumber
```
  - acknowledgmentNumber
```
private final int acknowledgmentNumber
```
  - dataOffset
```
private final byte dataOffset
```
  - reserved
```
private final byte reserved
```
  - urg
```
private final boolean urg
```
  - ack
```
private final boolean ack
```
  - psh
```
private final boolean psh
```
  - rst
```
private final boolean rst
```
  - syn
```
private final boolean syn
```
  - fin
```
private final boolean fin
```
  - window
```
private final short window
```
  - checksum
```
private final short checksum
```
  - urgentPointer
```
private final short urgentPointer
```
  - options
```
private final java.util.List<TcpPacket.TcpOption> options
```
  - padding
```
private final byte[] padding
```
- Constructor Detail
  - TcpHeader
```
private TcpHeader(byte[] rawData,
                  int offset,
                  int length)
           throws IllegalRawDataException
```
    Throws:
    
    IllegalRawDataException
  - TcpHeader
```
private TcpHeader(TcpPacket.Builder builder,
                  byte[] payload)
```
- Method Detail
  - calcChecksum
```
private short calcChecksum(java.net.InetAddress srcAddr,
                           java.net.InetAddress dstAddr,
                           byte[] header,
                           byte[] payload)
```
  - getSrcPort
```
public TcpPort getSrcPort()
```
    Specified by:
    
    getSrcPort in interface TransportPacket.TransportHeader
    
    Returns:
    
    Source port
  - getDstPort
```
public TcpPort getDstPort()
```
    Specified by:
    
    getDstPort in interface TransportPacket.TransportHeader
    
    Returns:
    
    Destination port
  - getSequenceNumber
```
public int getSequenceNumber()
```
    Returns:
    
    sequenceNumber
  - getSequenceNumberAsLong
```
public long getSequenceNumberAsLong()
```
    Returns:
    
    sequenceNumber
  - getAcknowledgmentNumber
```
public int getAcknowledgmentNumber()
```
    Returns:
    
    acknowledgmentNumber
  - getAcknowledgmentNumberAsLong
```
public long getAcknowledgmentNumberAsLong()
```
    Returns:
    
    acknowledgmentNumber
  - getDataOffset
```
public byte getDataOffset()
```
    Returns:
    
    dataOffset
  - getDataOffsetAsInt
```
public int getDataOffsetAsInt()
```
    Returns:
    
    dataOffset
  - getReserved
```
public byte getReserved()
```
    Returns:
    
    reserved
  - getUrg
```
public boolean getUrg()
```
    Returns:
    
    urg
  - getAck
```
public boolean getAck()
```
    Returns:
    
    ack
  - getPsh
```
public boolean getPsh()
```
    Returns:
    
    psh
  - getRst
```
public boolean getRst()
```
    Returns:
    
    rst
  - getSyn
```
public boolean getSyn()
```
    Returns:
    
    syn
  - getFin
```
public boolean getFin()
```
    Returns:
    
    fin
  - getWindow
```
public short getWindow()
```
    Returns:
    
    window
  - getWindowAsInt
```
public int getWindowAsInt()
```
    Returns:
    
    window
  - getChecksum
```
public short getChecksum()
```
    Returns:
    
    checksum
  - getUrgentPointer
```
public short getUrgentPointer()
```
    Returns:
    
    urgentPointer
  - getUrgentPointerAsInt
```
public int getUrgentPointerAsInt()
```
    Returns:
    
    urgentPointer
  - getOptions
```
public java.util.List<TcpPacket.TcpOption> getOptions()
```
    Returns:
    
    options
  - getPadding
```
public byte[] getPadding()
```
    Returns:
    
    padding
  - getRawFields
```
protected java.util.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
  - getRawFields
```
private java.util.List<byte[]> getRawFields(boolean zeroInsteadOfChecksum)
```
  - buildRawData
```
private byte[] buildRawData(boolean zeroInsteadOfChecksum)
```
  - measureLengthWithoutPadding
```
private int measureLengthWithoutPadding()
```
  - 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 java.lang.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(java.lang.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

Class TcpPacket.TcpHeader

Field Summary

Constructor Summary

Method Summary

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

Methods inherited from class java.lang.Object

Methods inherited from interface org.pcap4j.packet.Packet.Header

Field Detail

logger

serialVersionUID

SRC_PORT_OFFSET

SRC_PORT_SIZE

DST_PORT_OFFSET

DST_PORT_SIZE

SEQUENCE_NUMBER_OFFSET

SEQUENCE_NUMBER_SIZE

ACKNOWLEDGMENT_NUMBER_OFFSET

ACKNOWLEDGMENT_NUMBER_SIZE

DATA_OFFSET_AND_RESERVED_AND_CONTROL_BITS_OFFSET

DATA_OFFSET_AND_RESERVED_AND_CONTROL_BITS_SIZE

WINDOW_OFFSET

WINDOW_SIZE

CHECKSUM_OFFSET

CHECKSUM_SIZE

URGENT_POINTER_OFFSET

URGENT_POINTER_SIZE

OPTIONS_OFFSET

MIN_TCP_HEADER_SIZE

IPV4_PSEUDO_HEADER_SIZE

IPV6_PSEUDO_HEADER_SIZE

srcPort

dstPort

sequenceNumber

acknowledgmentNumber

dataOffset

reserved

urg

ack

psh

rst

syn

fin

window

checksum

urgentPointer

options

padding

Constructor Detail

TcpHeader

TcpHeader

Method Detail

calcChecksum

getSrcPort

getDstPort

getSequenceNumber

getSequenceNumberAsLong

getAcknowledgmentNumber

getAcknowledgmentNumberAsLong

getDataOffset

getDataOffsetAsInt

getReserved

getUrg

getAck

getPsh

getRst

getSyn

getFin

getWindow

getWindowAsInt

getChecksum

getUrgentPointer

getUrgentPointerAsInt

getOptions

getPadding

getRawFields

getRawFields

buildRawData

measureLengthWithoutPadding

calcLength

buildString