/// <summary>
/// Called when the <see cref="PacketReceived"/> event is raised.
/// </summary>
/// <remarks>
/// When overriding this method in a derived class, call the base implementation after your logic.
/// </remarks>
/// <param name="sender">The sender of the event.</param>
/// <param name="args">The packet data that was received.</param>
/// <exception cref="ArgumentNullException">Thrown if <paramref name="args"/> is <see langword="null"/>.</exception>
protected virtual void OnDataArrived(object sender, DataArrivedEventArgs args)
{
Guard.NotNull(() => args, args);
byte[] data = args.Data;
int position = 0, remaining = data.Length;
while (PacketBuffer.FreeSpace == 0)
{
byte[] rawData = PacketBuffer.ExtractAndReset(0);
if (rawData.Length > 0)
{
Crypto.Decrypt(rawData);
var incomingPacketArgs = new PacketReceivedEventArgs(rawData);
OnPacketReceived(incomingPacketArgs);
}
if (remaining == 0)
{
break;
}
int bufferred;
int headerRemaining = HeaderBuffer.FreeSpace;
if (headerRemaining > 0)
{
bufferred = HeaderBuffer.AppendFill(data, position, headerRemaining);
// For the confused: if we didn't fill the header, it
// means the data array didn't have enough elements.
// We move on.
if (bufferred < headerRemaining)
{
break;
}
position += bufferred;
remaining -= bufferred;
}
byte[] header = HeaderBuffer.ExtractAndReset(4);
int length;
if (!Crypto.TryGetLength(header, out length))
{
Close(@"Could not decode packet length.");
return;
}
PacketBuffer.Reset(length);
bufferred = PacketBuffer.AppendFill(data, position, remaining);
position += bufferred;
remaining -= bufferred;
}
}