private void TryProcessMessage(MqttConnection connection, SocketAsyncEventArgs receiveSendEventArgs)
{
var lastProcessedByteByCompleteMessage = -1;
var remainingBytesToProcess = connection.PreviouslyReceivedBytes + receiveSendEventArgs.BytesTransferred;
var bufferOffset = connection.ReceiveSocketOffset;
while (remainingBytesToProcess > 0)
{
try
{
var messageType = GetMessageType(
receiveSendEventArgs.Buffer,
ref bufferOffset,
ref remainingBytesToProcess);
var payloadLength = GetPayloadLength(
receiveSendEventArgs.Buffer,
ref bufferOffset,
ref remainingBytesToProcess);
if (payloadLength <= remainingBytesToProcess)
{
var rawMessage = rawMessageFactory.CreateRawMessageWithData(
connection,
messageType,
receiveSendEventArgs.Buffer,
bufferOffset,
payloadLength);
connection.EnqueueRawMessage(rawMessage);
bufferOffset += payloadLength;
remainingBytesToProcess -= payloadLength;
lastProcessedByteByCompleteMessage = bufferOffset - connection.ReceiveSocketOffset;
}
else
{
throw new AggregateException();
}
}
catch (AggregateException)
{
var totalUnprocessedBytes = connection.PreviouslyReceivedBytes
+ receiveSendEventArgs.BytesTransferred
- lastProcessedByteByCompleteMessage;
if (lastProcessedByteByCompleteMessage > 0)
{
Buffer.BlockCopy(
receiveSendEventArgs.Buffer,
connection.ReceiveSocketOffset + lastProcessedByteByCompleteMessage,
receiveSendEventArgs.Buffer,
connection.ReceiveSocketOffset,
totalUnprocessedBytes);
}
receiveSendEventArgs.SetBuffer(
connection.ReceiveSocketOffset + totalUnprocessedBytes,
connection.ReceiveSocketBufferSize - totalUnprocessedBytes);
connection.PreviouslyReceivedBytes = totalUnprocessedBytes;
return;
}
}
receiveSendEventArgs.SetBuffer(connection.ReceiveSocketOffset, connection.ReceiveSocketBufferSize);
}