/**
* 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)ControlPacketType.CONNECTION_HANDSHAKE == pktType)
{
packet = new ConnectionHandshake(controlInformation);
}
//TYPE 0001:1
else if ((int)ControlPacketType.KEEP_ALIVE == pktType)
{
packet = new KeepAlive();
}
//TYPE 0010:2
else if ((int)ControlPacketType.ACK == pktType)
{
packet = new Acknowledgement(additionalInfo, controlInformation);
}
//TYPE 0011:3
else if ((int)ControlPacketType.NAK == pktType)
{
packet = new NegativeAcknowledgement(controlInformation);
}
//TYPE 0101:5
else if ((int)ControlPacketType.SHUTDOWN == pktType)
{
packet = new Shutdown();
}
//TYPE 0110:6
else if ((int)ControlPacketType.ACK2 == pktType)
{
packet = new Acknowledgment2(additionalInfo, controlInformation);
}
//TYPE 0111:7
else if ((int)ControlPacketType.MESSAGE_DROP_REQUEST == pktType)
{
packet = new MessageDropRequest(controlInformation);
}
//TYPE 1111:8
else if ((int)ControlPacketType.USER_DEFINED == pktType)
{
packet = new UserDefined(controlInformation);
}
if (packet != null)
{
packet.TimeStamp = timeStamp;
packet.DestinationID = destID;
}
return(packet);
}