private async Task <bool> OnPacketReceived()
{
BinaryDataReadEventHandler h = this.OnReceived;
if (!(h is null))
{
try
{
return(await h(this, this.packetBuffer, 0, this.packetSize));
}
catch (Exception ex)
{
Log.Critical(ex);
}
}
return(true);
}
internal void UdpDatagramReceived(object _, UdpDatagramEventArgs e)
{
if (this.encapsulatePackets)
{
LinkedList <KeyValuePair <ushort, byte[]> > LostPackets = null;
byte[] FirstPacket = null;
ushort FirstPacketNr = 0;
ushort PacketNr;
byte[] Packet;
byte[] Data = e.Data;
int Len = Data.Length;
int Pos = 0;
int PacketLen;
int Offset;
byte b;
lock (this.udpReceiveLock)
{
while (Pos < Len)
{
b = Data[Pos++];
PacketLen = (b & 127);
Offset = 7;
while (Pos < Len && (b & 128) != 0)
{
b = Data[Pos++];
PacketLen |= (b & 127) << Offset;
Offset += 7;
}
if (Pos + 2 > Len)
{
break;
}
PacketNr = Data[Pos++];
PacketNr |= (ushort)(Data[Pos++] << 8);
if (Pos + PacketLen > Len)
{
break;
}
Packet = new byte[PacketLen];
Array.Copy(Data, Pos, Packet, 0, PacketLen);
Pos += PacketLen;
if ((short)(PacketNr - this.lastReceivedPacket) > 0)
{
if (FirstPacket is null)
{
FirstPacket = Packet;
FirstPacketNr = PacketNr;
}
else
{
if (LostPackets is null)
{
LostPackets = new LinkedList <KeyValuePair <ushort, byte[]> >();
}
LostPackets.AddFirst(new KeyValuePair <ushort, byte[]>(PacketNr, Packet)); // Reverse order
}
}
}
if (FirstPacket != null)
{
this.lastReceivedPacket = FirstPacketNr;
}
}
BinaryDataReadEventHandler h = this.OnReceived;
if (h != null)
{
if (LostPackets != null)
{
foreach (KeyValuePair <ushort, byte[]> P in LostPackets)
{
try
{
h(this, P.Value, 0, P.Value.Length);
}
catch (Exception ex)
{
Events.Log.Critical(ex);
}
}
}
if (FirstPacket != null)
{
try
{
h(this, FirstPacket, 0, FirstPacket.Length);
}
catch (Exception ex)
{
Events.Log.Critical(ex);
}
}
}
}
else
{
byte[] Data = e.Data;
int Len = Data.Length;
byte[] Packet = new byte[Len];
Array.Copy(Data, 0, Packet, 0, Len);
BinaryDataReadEventHandler h = this.OnReceived;
if (h != null)
{
try
{
h(this, Packet, 0, Packet.Length);
}
catch (Exception ex)
{
Events.Log.Critical(ex);
}
}
}
}
