/// <summary>
/// Creates a serialized request packet (DtmPacket)
/// </summary>
private MemoryStream CreateRequest(DtmPacketFlags Message, short State)
{
MemoryStream ret = new DtmPacketStruct(Message, 0, 0, State).ToStream();
ret.Seek(0, SeekOrigin.Begin);
return(ret);
}
private void Transmit(DtmPacketFlags PacketType, short PacketFlag, long OptionFlag = 0, MemoryStream Payload = null)
{
lock (_sndLock)
{
long pldLen = Payload == null ? 0 : Payload.Length;
// create a new packet: packet flag, payload size, sequence, and state flag
MemoryStream pktStm = new DtmPacketStruct(PacketType, pldLen, _sndSequence, PacketFlag, OptionFlag).ToStream();
// add payload
if (Payload != null)
{
// copy to output
pktStm.Seek(0, SeekOrigin.End);
Payload.WriteTo(pktStm);
pktStm.Seek(0, SeekOrigin.Begin);
}
// store in the file packet buffer
_sndBuffer.Push(_sndSequence, pktStm);
// increment file send counter
_sndSequence++;
// transmit to remote client
if (_clientSocket.IsConnected)
{
try
{
_clientSocket.SendAsync(pktStm);
}
catch (CryptoSocketException ce)
{
SocketException se = ce.InnerException as SocketException;
if (se.SocketErrorCode == SocketError.WouldBlock ||
se.SocketErrorCode == SocketError.IOPending ||
se.SocketErrorCode == SocketError.NoBufferSpaceAvailable)
{
// buffer is full, throttle down
Throttle(pktStm);
}
else
{
// possible connection dropped, alert app
if (SessionError != null)
{
DtmErrorArgs args = new DtmErrorArgs(ce, DtmErrorSeverityFlags.Connection);
SessionError(this, args);
}
}
}
catch (Exception ex)
{
// possible connection dropped, alert app
if (SessionError != null)
{
DtmErrorArgs args = new DtmErrorArgs(ex, DtmErrorSeverityFlags.Connection);
SessionError(this, args);
}
}
// notify app
if (PacketSent != null)
{
PacketSent(this, new DtmPacketArgs((short)DtmTransferFlags.DataChunk, pldLen));
}
}
}
}
