com.sun.tv.net

Class GenericPacket

java.lang.Object

com.sun.tv.net.Packet

com.sun.tv.net.GenericPacket

public class GenericPacket
extends Packet

This class implements a general purpose network packet buffer mechanism. GenericPackets can be used for any packet processing at any protocol layer, for input or output. They are not tied to any particular hardware device. This makes GenericPackets suitable for protocols that require packets to exist beyond the scope of the ProtocolStack.lock. This is opposed to LancePackets, which are one-shot only and must not be held between context switches. GenericPackets do pay a price for their flexibility, however. There is usually one or two more copies involved and perhaps a little bit more bookkeeping in terms of internal data structures. sritchie -- Apr 96 notes The implementation is as simple as possible right now. All packet buffers are allocated fresh from the heap by new() -- there is no free list of buffers as in the old MBuf scheme. This may change as the users of GenericPacket increase and performance becomes a concern.

Field Summary

Fields inherited from class com.sun.tv.net.Packet

dst_ip, hdr_offset, length, next, prev, src_ip, src_port

Method Summary

Methods

Modifier and Type	Method and Description
int	cksum(int offset, int len)
Packet	copy()
static GenericPacket	get(int hlen, int dlen)
int	getByte(int off)
byte[]	getByteArray()
void	getBytes(int src_offset, byte[] dst, int dst_offset, int len)
long	getEthAddr(int off)
int	getInt(int off)
int	getShort(int off)
void	putByte(int d, int off)
void	putBytes(byte[] src, int src_offset, int dst_offset, int len)
void	putBytes(Packet pkt, int src_offset, int dst_offset, int len)
void	putEthAddr(long d, int off)
void	putInt(int d, int off)
void	putShort(int d, int off)
void	recycle()

Methods inherited from class com.sun.tv.net.Packet

dataLength, getHeaderOffset, length, setDataLength, setHeaderOffset, setLength, shiftHeader

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

get

public static GenericPacket get(int hlen,
                int dlen)

recycle

public void recycle()

Specified by:

recycle in class Packet

getByteArray

public byte[] getByteArray()

copy

public Packet copy()

Specified by:

copy in class Packet

cksum

public int cksum(int offset,
        int len)

Specified by:

cksum in class Packet

getEthAddr

public long getEthAddr(int off)

Specified by:

getEthAddr in class Packet

getInt

public int getInt(int off)

Specified by:

getInt in class Packet

getShort

public int getShort(int off)

Specified by:

getShort in class Packet

getByte

public int getByte(int off)

Specified by:

getByte in class Packet

getBytes

public void getBytes(int src_offset,
            byte[] dst,
            int dst_offset,
            int len)

Specified by:

getBytes in class Packet

putEthAddr

public void putEthAddr(long d,
              int off)

Specified by:

putEthAddr in class Packet

putInt

public void putInt(int d,
          int off)

Specified by:

putInt in class Packet

putShort

public void putShort(int d,
            int off)

Specified by:

putShort in class Packet

putByte

public void putByte(int d,
           int off)

Specified by:

putByte in class Packet

putBytes

public void putBytes(byte[] src,
            int src_offset,
            int dst_offset,
            int len)

Specified by:

putBytes in class Packet

putBytes

public void putBytes(Packet pkt,
            int src_offset,
            int dst_offset,
            int len)

Specified by:

putBytes in class Packet