/**
* 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);
}
public override bool equals(Object obj)
{
if (this == obj)
{
return(true);
}
if (!base.equals(obj))
{
return(false);
}
if (this.GetType() != obj.GetType())
{
return(false);
}
NegativeAcknowledgement other = (NegativeAcknowledgement)obj;
List <int> thisLost = null;
List <int> otherLost = null;
//compare the loss info
if (lostSequenceNumbers != null)
{
thisLost = lostSequenceNumbers;
}
else
{
if (lossInfo.Count > 0)
{
byte[] loss = new byte[lossInfo.Count];
for (int i = 0; i < lossInfo.Count; i++)
{
loss[i] = lossInfo[i];
}
thisLost = decode(loss);
}
}
if (other.lostSequenceNumbers != null)
{
otherLost = other.lostSequenceNumbers;
}
else
{
if (other.lossInfo.Count > 0)
{
byte[] loss = new byte[other.lossInfo.Count];
for (int i = 0; i < other.lossInfo.Count; i++)
{
loss[i] = other.lossInfo[i];
}
otherLost = other.decode(loss);
}
}
if (!thisLost.Equals(otherLost))
{
return(false);
}
return(true);
}