IPDecoder (nl.sidnlabs:pcap-lib 0.2.16 API)

java.lang.Object
- nl.sidnlabs.pcap.decoder.IPDecoder

```
public class IPDecoder
extends Object
```
Decode the IP header

Field Summary

Fields
Modifier and Type	Field	Description
`static int`	`IP_FLAGS`
`static int`	`IP_FRAGMENT_OFFSET`
`static int`	`IP_PROTOCOL_VERSION_4`
`static int`	`IP_PROTOCOL_VERSION_6`
`static int`	`IP_TOTAL_LEN_OFFSET`

Constructor Summary

Constructors
Constructor Description

IPDecoder(Decoder tcpReader, Decoder udpReader, ICMPDecoder icmpDecoder)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`clearCache(int ipFragmentTTL)`	Clear expired cache entries in order to avoid memory problems
`Packet`	`createPacket(byte[] packetData, int ipStart)`
`Packet`	`decode(byte[] packetData, int ipStart, long packetTimestampSecs, long packetTimestampMicros)`
`com.google.common.collect.Multimap<Datagram,DatagramPayload>`	`getDatagrams()`
`void`	`printStats()`
`byte[]`	`reassemble(Packet packet, byte[] packetData)`	Reassemble the IP packet is it is fragmented.
`void`	`setDatagrams(com.google.common.collect.Multimap<Datagram,DatagramPayload> datagrams)`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail
- IP_PROTOCOL_VERSION_4
```
public static final int IP_PROTOCOL_VERSION_4
```
  See Also:
  
  Constant Field Values
- IP_PROTOCOL_VERSION_6
```
public static final int IP_PROTOCOL_VERSION_6
```
  See Also:
  
  Constant Field Values
- IP_TOTAL_LEN_OFFSET
```
public static final int IP_TOTAL_LEN_OFFSET
```
  See Also:
  
  Constant Field Values
- IP_FLAGS
```
public static final int IP_FLAGS
```
  See Also:
  
  Constant Field Values
- IP_FRAGMENT_OFFSET
```
public static final int IP_FRAGMENT_OFFSET
```
  See Also:
  
  Constant Field Values

Constructor Detail

IPDecoder

public IPDecoder(Decoder tcpReader,
                 Decoder udpReader,
                 ICMPDecoder icmpDecoder)

Method Detail
- printStats
```
public void printStats()
```
- decode
```
public Packet decode(byte[] packetData,
                     int ipStart,
                     long packetTimestampSecs,
                     long packetTimestampMicros)
```
- createPacket
```
public Packet createPacket(byte[] packetData,
                           int ipStart)
```
- reassemble
```
public byte[] reassemble(Packet packet,
                         byte[] packetData)
```
  Reassemble the IP packet is it is fragmented. If it is not fragmented then the packetData bytes are returned as result. If the packet is fragmented and this packet is the final fragment then all the bytes from the fragments are concatenated and returned. if fragmented and current fragment is not yet the final fragment then an empty byte array is returned. the
  
  Parameters:
  
  packet - the current packet
  
  packetData - the payload of the current packet
  
  Returns:
  
  input, reassembled or no bytes
- getDatagrams
```
public com.google.common.collect.Multimap<Datagram,DatagramPayload> getDatagrams()
```
- setDatagrams
```
public void setDatagrams(com.google.common.collect.Multimap<Datagram,DatagramPayload> datagrams)
```
- clearCache
```
public void clearCache(int ipFragmentTTL)
```
  Clear expired cache entries in order to avoid memory problems
  
  Parameters:
  
  ipFragmentTTL - timeout for IP fragments