public ServerPacketFragment(GameMessageOnChannel message)
{
Opcode = message.Opcode;
Data = message.Data;
Payload = new BinaryWriter(Data);
Header = new PacketFragmentHeader()
{
Group = (ushort)message.Channel
};
}
public ServerPacketFragment(ushort group, GameMessage message)
{
Opcode = message.Opcode;
Data = message.Data;
Payload = new BinaryWriter(Data);
Header = new PacketFragmentHeader()
{
Group = group
};
}
public ServerPacketFragment(ushort group, GameMessageOpcode opcode = GameMessageOpcode.None)
{
Opcode = opcode;
Data = new MemoryStream((int)MaxFragmentDataSize);
Payload = new BinaryWriter(Data);
Header = new PacketFragmentHeader()
{
Group = group
};
if (opcode != GameMessageOpcode.None)
{
Payload.Write((uint)opcode);
}
}
public ServerPacketFragment()
{
Header = new PacketFragmentHeader();
}
/// <summary>
/// This function handles turning a bundle of messages (representing all messages accrued in a timeslice),
/// into 1 or more packets, combining multiple messages into one packet or spliting large message across
/// several packets as needed.
///
/// 1 Create Packet
/// 2 If first packet for this bundle, fill any optional headers
/// 3 Append messages that will fit
/// 4 If we have more messages, create additional packets.
/// 5 If any packet is greater than the max packet size, split it across two fragments
/// </summary>
/// <param name="bundle"></param>
private void SendBundle(NetworkBundle bundle)
{
bool firstPacket = true;
MessageFragment carryOverMessage = null;
while (firstPacket || carryOverMessage != null || bundle.Messages.Count > 0)
{
ServerPacket packet = new ServerPacket();
PacketHeader packetHeader = packet.Header;
if (bundle.EncryptedChecksum)
{
packetHeader.Flags |= PacketHeaderFlags.EncryptedChecksum;
}
uint availableSpace = Packet.MaxPacketDataSize;
if (firstPacket)
{
firstPacket = false;
if (bundle.SendAck) //0x4000
{
packetHeader.Flags |= PacketHeaderFlags.AckSequence;
packet.BodyWriter.Write(lastReceivedSequence);
}
if (bundle.TimeSync) //0x1000000
{
packetHeader.Flags |= PacketHeaderFlags.TimeSynch;
packet.BodyWriter.Write(ConnectionData.ServerTime);
}
if (bundle.ClientTime != -1f) //0x4000000
{
packetHeader.Flags |= PacketHeaderFlags.EchoResponse;
packet.BodyWriter.Write(bundle.ClientTime);
packet.BodyWriter.Write((float)ConnectionData.ServerTime - bundle.ClientTime);
}
availableSpace -= (uint)packet.Data.Length;
}
if (carryOverMessage != null || bundle.Messages.Count > 0)
{
packetHeader.Flags |= PacketHeaderFlags.BlobFragments;
int fragmentCount = 0;
while (carryOverMessage != null || bundle.Messages.Count > 0)
{
MessageFragment currentMessageFragment;
if (carryOverMessage != null) // If we have a carryOverMessage, use that
{
currentMessageFragment = carryOverMessage;
carryOverMessage = null;
}
else // If we don't have a carryOverMessage, go ahead and dequeue next message from the bundle
{
currentMessageFragment = new MessageFragment(bundle.Messages.Dequeue());
}
var currentGameMessage = currentMessageFragment.message;
availableSpace -= PacketFragmentHeader.HeaderSize; // Account for fragment header
// Compute amount of data to send based on the total length and current position
uint dataToSend = (uint)currentGameMessage.Data.Length - currentMessageFragment.position;
if (dataToSend > availableSpace) // Message is too large to fit in packet
{
carryOverMessage = currentMessageFragment;
if (fragmentCount == 0) // If this is first message in packet, this is just a really large message, so proceed with splitting it
{
dataToSend = availableSpace;
}
else // Otherwise there are other messages already, so we'll break and come back and see if the message will fit
{
break;
}
}
if (currentMessageFragment.count == 0) // Compute number of fragments if we have not already
{
uint remainingData = (uint)currentGameMessage.Data.Length - dataToSend;
currentMessageFragment.count = (ushort)(Math.Ceiling((double)remainingData / PacketFragment.MaxFragmentDataSize) + 1);
}
// Set sequence, if new, pull next sequence from ConnectionData, if it is a carryOver, reuse that sequence
currentMessageFragment.sequence = currentMessageFragment.sequence == 0 ? ConnectionData.FragmentSequence++ : currentMessageFragment.sequence;
// Build ServerPacketFragment structure
ServerPacketFragment fragment = new ServerPacketFragment();
PacketFragmentHeader fragmentHeader = fragment.Header;
fragmentHeader.Sequence = currentMessageFragment.sequence;
fragmentHeader.Id = 0x80000000;
fragmentHeader.Count = currentMessageFragment.count;
fragmentHeader.Index = currentMessageFragment.index;
fragmentHeader.Group = (ushort)currentMessageFragment.message.Group;
// Read data starting at current position reading dataToSend bytes
currentGameMessage.Data.Seek(currentMessageFragment.position, SeekOrigin.Begin);
fragment.Content = new byte[dataToSend];
currentGameMessage.Data.Read(fragment.Content, 0, (int)dataToSend);
// Increment position and index
currentMessageFragment.position = currentMessageFragment.position + dataToSend;
currentMessageFragment.index++;
// Add fragment to packet
packet.AddFragment(fragment);
fragmentCount++;
// Deduct consumed space
availableSpace -= dataToSend;
// Smallest message I am aware of requires HeaderSize + 4 bytes, so if we have less space then that, go ahead and break
if (availableSpace <= PacketFragmentHeader.HeaderSize + 4)
{
break;
}
}
}
PacketQueue.Enqueue(packet);
}
}
/// <summary>
/// This function handles turning a bundle of messages (representing all messages accrued in a timeslice),
/// into 1 or more packets, combining multiple messages into one packet or spliting large message across
/// several packets as needed.
///
/// 1 Create Packet
/// 2 If first packet for this bundle, fill any optional headers
/// 3 Append fragments that will fit
/// 3.1 Check each fragment to see if it is a partial fit
/// 4 If we have a partial message remaining or more messages, create additional packets.
/// </summary>
/// <param name="bundle"></param>
private void SendBundle(NetworkBundle bundle)
{
bool firstPacket = true;
MessageFragment carryOverMessage = null;
while (firstPacket || carryOverMessage != null || bundle.Messages.Count > 0)
{
ServerPacket packet = new ServerPacket();
PacketHeader packetHeader = packet.Header;
if (bundle.encryptedChecksum)
{
packetHeader.Flags |= PacketHeaderFlags.EncryptedChecksum;
}
uint availableSpace = Packet.MaxPacketDataSize;
if (firstPacket)
{
firstPacket = false;
if (bundle.SendAck) //0x4000
{
packetHeader.Flags |= PacketHeaderFlags.AckSequence;
packet.BodyWriter.Write(lastReceivedSequence);
}
if (bundle.TimeSync) //0x1000000
{
packetHeader.Flags |= PacketHeaderFlags.TimeSynch;
packet.BodyWriter.Write(ConnectionData.ServerTime);
}
if (bundle.ClientTime != -1f) //0x4000000
{
packetHeader.Flags |= PacketHeaderFlags.EchoResponse;
packet.BodyWriter.Write(bundle.ClientTime);
packet.BodyWriter.Write((float)ConnectionData.ServerTime - bundle.ClientTime);
}
availableSpace -= (uint)packet.Data.Length;
}
if (carryOverMessage != null || bundle.Messages.Count > 0)
{
packetHeader.Flags |= PacketHeaderFlags.BlobFragments;
while (carryOverMessage != null || bundle.Messages.Count > 0)
{
if (availableSpace <= PacketFragmentHeader.HeaderSize + 4)
{
break;
}
MessageFragment currentMessageFragment;
if (carryOverMessage != null)
{
currentMessageFragment = carryOverMessage;
carryOverMessage = null;
currentMessageFragment.index++;
}
else
{
currentMessageFragment = new MessageFragment(bundle.Messages.Dequeue());
}
var currentGameMessage = currentMessageFragment.message;
ServerPacketFragment fragment = new ServerPacketFragment();
PacketFragmentHeader fragmentHeader = fragment.Header;
availableSpace -= PacketFragmentHeader.HeaderSize;
currentMessageFragment.sequence = currentMessageFragment.sequence == 0 ? ConnectionData.FragmentSequence++ : currentMessageFragment.sequence;
uint dataToSend = (uint)currentGameMessage.Data.Length - currentMessageFragment.position;
if (dataToSend > availableSpace)
{
dataToSend = availableSpace;
carryOverMessage = currentMessageFragment;
}
if (currentMessageFragment.count == 0)
{
uint remainingData = (uint)currentGameMessage.Data.Length - dataToSend;
currentMessageFragment.count = (ushort)(Math.Ceiling((double)remainingData / PacketFragment.MaxFragmentDataSize) + 1);
}
fragmentHeader.Sequence = currentMessageFragment.sequence;
fragmentHeader.Id = 0x80000000;
fragmentHeader.Count = currentMessageFragment.count;
fragmentHeader.Index = currentMessageFragment.index;
fragmentHeader.Group = (ushort)currentMessageFragment.message.Group;
currentGameMessage.Data.Seek(currentMessageFragment.position, SeekOrigin.Begin);
fragment.Content = new byte[dataToSend];
currentGameMessage.Data.Read(fragment.Content, 0, (int)dataToSend);
currentMessageFragment.position = currentMessageFragment.position + dataToSend;
availableSpace -= dataToSend;
packet.AddFragment(fragment);
//break;
}
}
PacketQueue.Enqueue(packet);
}
}
public ClientPacketFragment(BinaryReader payload)
{
Header = new PacketFragmentHeader(payload);
Data = new MemoryStream(payload.ReadBytes((int)(Header.Size - PacketFragmentHeader.HeaderSize)));
Payload = new BinaryReader(Data);
}
public ServerPacketFragment(byte[] data)
{
Header = new PacketFragmentHeader();
Data = data;
}
public ClientPacketFragment(BinaryReader payload)
{
Header = new PacketFragmentHeader(payload);
Data = payload.ReadBytes((int)(Header.Size - PacketFragmentHeader.HeaderSize));
}