public override byte[] encodeControlInformation()
{
try
{
byte[] budtVersion = PacketUtil.encode(udtVersion);
byte[] bsocketType = PacketUtil.encode(socketType);
byte[] binitialSeqNo = PacketUtil.encode(initialSeqNo);
byte[] bpacketSize = PacketUtil.encode(packetSize);
byte[] bmaxFlowWndSize = PacketUtil.encode(maxFlowWndSize);
byte[] bconnectionType = PacketUtil.encode(connectionType);
byte[] bsocketID = PacketUtil.encode(socketID);
byte[] bvalue = new byte[budtVersion.Length + bsocketType.Length + binitialSeqNo.Length + bpacketSize.Length + bmaxFlowWndSize.Length + bconnectionType.Length + bsocketID.Length];
Array.Copy(budtVersion, 0, bvalue, 0, budtVersion.Length);
Array.Copy(bsocketType, 0, bvalue, budtVersion.Length, bsocketType.Length);
Array.Copy(binitialSeqNo, 0, bvalue, budtVersion.Length + bsocketType.Length, binitialSeqNo.Length);
Array.Copy(bpacketSize, 0, bvalue, budtVersion.Length + bsocketType.Length + binitialSeqNo.Length, bpacketSize.Length);
Array.Copy(bmaxFlowWndSize, 0, bvalue, budtVersion.Length + bsocketType.Length + binitialSeqNo.Length + bpacketSize.Length, bmaxFlowWndSize.Length);
Array.Copy(bconnectionType, 0, bvalue, budtVersion.Length + bsocketType.Length + binitialSeqNo.Length + bpacketSize.Length + bmaxFlowWndSize.Length, bconnectionType.Length);
Array.Copy(bsocketID, 0, bvalue, budtVersion.Length + bsocketType.Length + binitialSeqNo.Length + bpacketSize.Length + bmaxFlowWndSize.Length + bconnectionType.Length, bsocketID.Length);
return(bvalue);
}
catch (Exception e)
{
// can't happen
Log.Write(this.ToString(), "can't happen", e);
return(null);
}
}
/**
* add an interval of lost packet numbers
* @param firstSequenceNumber
* @param lastSequenceNumber
*/
public void addLossInfo(long firstSequenceNumber, long lastSequenceNumber)
{
//check if we really need an interval
if (lastSequenceNumber - firstSequenceNumber == 0)
{
addLossInfo(firstSequenceNumber);
return;
}
//else add an interval
byte[] enc1 = PacketUtil.encodeSetHighest(true, firstSequenceNumber);
byte[] enc2 = PacketUtil.encodeSetHighest(false, lastSequenceNumber);
try
{
for (int i = 0; i < enc1.Length; i++)
{
lossInfo.Add(enc1[i]);
}
for (int i = 0; i < enc2.Length; i++)
{
lossInfo.Add(enc2[i]);
}
}
catch (Exception ignore)
{
Log.Write(this.ToString(), ignore);
}
}
public override byte[] encodeControlInformation()
{
try
{
byte[] backNumber = PacketUtil.encode(ackNumber);
byte[] broundTripTime = PacketUtil.encode(roundTripTime);
byte[] broundTripTimeVariance = PacketUtil.encode(roundTripTimeVariance);
byte[] bbufferSize = PacketUtil.encode(bufferSize);
byte[] bpktArrivalSpeed = PacketUtil.encode(pktArrivalSpeed);
byte[] bestimatedLinkCapacity = PacketUtil.encode(estimatedLinkCapacity);
byte[] bvalue = new byte[backNumber.Length + broundTripTime.Length + broundTripTimeVariance.Length + bbufferSize.Length + bpktArrivalSpeed.Length + bestimatedLinkCapacity.Length];
Array.Copy(backNumber, 0, bvalue, 0, backNumber.Length);
Array.Copy(broundTripTime, 0, bvalue, backNumber.Length, broundTripTime.Length);
Array.Copy(broundTripTimeVariance, 0, bvalue, backNumber.Length + broundTripTime.Length, broundTripTimeVariance.Length);
Array.Copy(bbufferSize, 0, bvalue, backNumber.Length + broundTripTime.Length + broundTripTimeVariance.Length, bbufferSize.Length);
Array.Copy(bpktArrivalSpeed, 0, bvalue, backNumber.Length + broundTripTime.Length + broundTripTimeVariance.Length + bbufferSize.Length, bpktArrivalSpeed.Length);
Array.Copy(bestimatedLinkCapacity, 0, bvalue, backNumber.Length + broundTripTime.Length + broundTripTimeVariance.Length + bbufferSize.Length + bpktArrivalSpeed.Length, bestimatedLinkCapacity.Length);
return(bvalue);
}
catch (Exception e)
{
// can't happen
return(null);
}
}
/**
* create the right type of control packet based on the packet data
* @param packetData
* @return
*/
public static ControlPacket createControlPacket(byte[] encodedData, int length)
{
ControlPacket packet = null;
int pktType = PacketUtil.decodeType(encodedData, 0);
long additionalInfo = PacketUtil.decode(encodedData, 4);
long timeStamp = PacketUtil.decode(encodedData, 8);
long destID = PacketUtil.decode(encodedData, 12);
byte[] controlInformation = new byte[length - 16];
Array.Copy(encodedData, 16, controlInformation, 0, controlInformation.Length);
//TYPE 0000:0
if ((int)ControlPacket.ControlPacketType.CONNECTION_HANDSHAKE == pktType)
{
packet = new ConnectionHandshake(controlInformation);
}
//TYPE 0001:1
else if ((int)ControlPacket.ControlPacketType.KEEP_ALIVE == pktType)
{
packet = new KeepAlive();
}
//TYPE 0010:2
else if ((int)ControlPacket.ControlPacketType.ACK == pktType)
{
packet = new Acknowledgement(additionalInfo, controlInformation);
}
//TYPE 0011:3
else if ((int)ControlPacket.ControlPacketType.NAK == pktType)
{
packet = new NegativeAcknowledgement(controlInformation);
}
//TYPE 0101:5
else if ((int)ControlPacket.ControlPacketType.SHUTDOWN == pktType)
{
packet = new Shutdown();
}
//TYPE 0110:6
else if ((int)ControlPacket.ControlPacketType.ACK2 == pktType)
{
packet = new Acknowledgment2(additionalInfo, controlInformation);
}
//TYPE 0111:7
else if ((int)ControlPacket.ControlPacketType.MESSAGE_DROP_REQUEST == pktType)
{
packet = new MessageDropRequest(controlInformation);
}
//TYPE 1111:8
else if ((int)ControlPacket.ControlPacketType.USER_DEFINED == pktType)
{
packet = new UserDefined(controlInformation);
}
if (packet != null)
{
packet.setTimeStamp(timeStamp);
packet.setDestinationID(destID);
}
return(packet);
}
/**
* return the header according to specification p.5
* @return
*/
byte[] getHeader()
{
byte[] res = new byte[16];
Array.Copy(PacketUtil.encodeControlPacketType(controlPacketType), 0, res, 0, 4);
Array.Copy(PacketUtil.encode(getAdditionalInfo()), 0, res, 4, 4);
Array.Copy(PacketUtil.encode(timeStamp), 0, res, 8, 4);
Array.Copy(PacketUtil.encode(destinationID), 0, res, 12, 4);
return(res);
}
private void decode(byte[] encodedData, int length)
{
packetSequenceNumber = PacketUtil.decode(encodedData, 0);
messageNumber = PacketUtil.decode(encodedData, 4);
timeStamp = PacketUtil.decode(encodedData, 8);
destinationID = PacketUtil.decode(encodedData, 12);
data = new byte[length - 16];
Array.Copy(encodedData, 16, data, 0, data.Length);
}
/**
* complete header+data packet for transmission
*/
public byte[] getEncoded()
{
//header.length is 16
byte[] result = new byte[16 + data.Length];
Array.Copy(PacketUtil.encode(packetSequenceNumber), 0, result, 0, 4);
Array.Copy(PacketUtil.encode(messageNumber), 0, result, 4, 4);
Array.Copy(PacketUtil.encode(timeStamp), 0, result, 8, 4);
Array.Copy(PacketUtil.encode(destinationID), 0, result, 12, 4);
Array.Copy(data, 0, result, 16, data.Length);
return(result);
}
void decode(byte[] data)
{
udtVersion = PacketUtil.decode(data, 0);
socketType = PacketUtil.decode(data, 4);
initialSeqNo = PacketUtil.decode(data, 8);
packetSize = PacketUtil.decode(data, 12);
maxFlowWndSize = PacketUtil.decode(data, 16);
connectionType = PacketUtil.decode(data, 20);
socketID = PacketUtil.decode(data, 24);
if (data.Length > 28)
{
cookie = PacketUtil.decode(data, 28);
}
}
/**
* add a single lost packet number
* @param singleSequenceNumber
*/
public void addLossInfo(long singleSequenceNumber)
{
byte[] enc = PacketUtil.encodeSetHighest(false, singleSequenceNumber);
try
{
for (int i = 0; i < enc.Length; i++)
{
lossInfo.Add(enc[i]);
}
}
catch (Exception ignore)
{
Log.Write(this.ToString(), ignore);
}
}
void decodeControlInformation(byte[] data)
{
ackNumber = PacketUtil.decode(data, 0);
if (data.Length > 4)
{
roundTripTime = PacketUtil.decode(data, 4);
roundTripTimeVariance = PacketUtil.decode(data, 8);
bufferSize = PacketUtil.decode(data, 12);
}
if (data.Length > 16)
{
pktArrivalSpeed = PacketUtil.decode(data, 16);
estimatedLinkCapacity = PacketUtil.decode(data, 20);
}
}
public override byte[] encodeControlInformation()
{
try
{
byte[] bmsgFirstSeqNo = PacketUtil.encode(msgFirstSeqNo);
byte[] bmsgLastSeqNo = PacketUtil.encode(msgLastSeqNo);
byte[] bos = new byte[bmsgFirstSeqNo.Length + bmsgLastSeqNo.Length];
Array.Copy(bmsgFirstSeqNo, 0, bos, 0, bmsgFirstSeqNo.Length);
Array.Copy(bmsgLastSeqNo, 0, bos, bmsgFirstSeqNo.Length, bmsgLastSeqNo.Length);
return(bos);
}
catch (Exception e)
{
// can't happen
return(null);
}
}
void decode(byte[] data)
{
msgFirstSeqNo = PacketUtil.decode(data, 0);
msgLastSeqNo = PacketUtil.decode(data, 4);
}