private ServerPacketFragment CreateServerFragment(ushort index)
{
packetLog.DebugFormat("Creating ServerFragment for index {0}", index);
if (index >= Count)
{
throw new ArgumentOutOfRangeException("index", index, "Passed index is greater then computed count");
}
var position = index * PacketFragment.MaxFragmentDataSize;
if (position > DataLength)
{
throw new ArgumentOutOfRangeException("index", index, "Passed index computes to invalid position size");
}
if (DataRemaining <= 0)
{
throw new InvalidOperationException("There is no data remaining");
}
var dataToSend = DataLength - position;
if (dataToSend > PacketFragment.MaxFragmentDataSize)
{
dataToSend = PacketFragment.MaxFragmentDataSize;
}
if (DataRemaining < dataToSend)
{
throw new InvalidOperationException("More data to send then data remaining!");
}
// Read data starting at position reading dataToSend bytes
Message.Data.Seek(position, SeekOrigin.Begin);
byte[] data = new byte[dataToSend];
Message.Data.Read(data, 0, dataToSend);
// Build ServerPacketFragment structure
ServerPacketFragment fragment = new ServerPacketFragment(data);
fragment.Header.Sequence = Sequence;
fragment.Header.Id = 0x80000000;
fragment.Header.Count = Count;
fragment.Header.Index = index;
fragment.Header.Queue = (ushort)Message.Group;
DataRemaining -= dataToSend;
packetLog.DebugFormat("Done creating ServerFragment for index {0}. After reading {1} DataRemaining {2}", index, dataToSend, DataRemaining);
return(fragment);
}
/// <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.
/// </summary>
/// <param name="bundle"></param>
private void SendBundle(NetworkBundle bundle, GameMessageGroup group)
{
packetLog.DebugFormat("[{0}] Sending Bundle", session.LoggingIdentifier);
bool writeOptionalHeaders = true;
List <MessageFragment> fragments = new List <MessageFragment>();
// Pull all messages out and create MessageFragment objects
while (bundle.HasMoreMessages)
{
var message = bundle.Dequeue();
var fragment = new MessageFragment(message, ConnectionData.FragmentSequence++);
fragments.Add(fragment);
}
packetLog.DebugFormat("[{0}] Bundle Fragment Count: {1}", session.LoggingIdentifier, fragments.Count);
// Loop through while we have fragements
while (fragments.Count > 0 || writeOptionalHeaders)
{
ServerPacket packet = new ServerPacket();
PacketHeader packetHeader = packet.Header;
if (fragments.Count > 0)
{
packetHeader.Flags |= PacketHeaderFlags.BlobFragments;
}
if (bundle.EncryptedChecksum)
{
packetHeader.Flags |= PacketHeaderFlags.EncryptedChecksum;
}
int availableSpace = ServerPacket.MaxPacketSize;
// Pull first message and see if it is a large one
var firstMessage = fragments.FirstOrDefault();
if (firstMessage != null)
{
// If a large message send only this one, filling the whole packet
if (firstMessage.DataRemaining >= availableSpace)
{
packetLog.DebugFormat("[{0}] Sending large fragment", session.LoggingIdentifier);
ServerPacketFragment spf = firstMessage.GetNextFragment();
packet.Fragments.Add(spf);
availableSpace -= spf.Length;
if (firstMessage.DataRemaining <= 0)
{
fragments.Remove(firstMessage);
}
}
// Otherwise we'll write any optional headers and process any small messages that will fit
else
{
if (writeOptionalHeaders)
{
writeOptionalHeaders = false;
WriteOptionalHeaders(bundle, packet);
if (packet.Data != null)
{
availableSpace -= (int)packet.Data.Length;
}
}
// Create a list to remove completed messages after iterator
List <MessageFragment> removeList = new List <MessageFragment>();
foreach (MessageFragment fragment in fragments)
{
// Is this a large fragment and does it have a tail that needs sending?
if (!fragment.TailSent && availableSpace >= fragment.TailSize)
{
packetLog.DebugFormat("[{0}] Sending tail fragment", session.LoggingIdentifier);
ServerPacketFragment spf = fragment.GetTailFragment();
packet.Fragments.Add(spf);
availableSpace -= spf.Length;
}
// Otherwise will this message fit in the remaining space?
else if (availableSpace >= fragment.NextSize)
{
packetLog.DebugFormat("[{0}] Sending small message", session.LoggingIdentifier);
ServerPacketFragment spf = fragment.GetNextFragment();
packet.Fragments.Add(spf);
availableSpace -= spf.Length;
}
// If message is out of data, set to remove it
if (fragment.DataRemaining <= 0)
{
removeList.Add(fragment);
}
}
// Remove all completed messages
fragments.RemoveAll(x => removeList.Contains(x));
}
}
// If no messages, write optional headers
else
{
packetLog.DebugFormat("[{0}] No messages, just sending optional headers", session.LoggingIdentifier);
if (writeOptionalHeaders)
{
writeOptionalHeaders = false;
WriteOptionalHeaders(bundle, packet);
if (packet.Data != null)
{
availableSpace -= (int)packet.Data.Length;
}
}
}
EnqueueSend(packet);
}
}
