/// <summary>
/// Processes the packet within the context. Returns true whether the packet was processed or throttled.
/// </summary>
/// <param name="channel">The through which the packet is coming/going out.</param>
/// <param name="context">The packet context for this operation.</param>
/// <returns>True whether the packet was processed or throttled, false otherwise.</returns>
public static ProcessingState Process(Emitter.Connection channel, ProcessingContext context)
{
// Get the buffer
var buffer = context.Buffer;
if (buffer == null)
{
return(ProcessingState.Failure);
}
// Get the info
var pBuffer = buffer.AsBytePointer();
int length = buffer.Length;
// To close the connection cleanly, a frame consisting of just a 0xFF
// byte followed by a 0x00 byte is sent from one peer to ask that the
// other peer close the connection.
if (*pBuffer == 0xFF && *(pBuffer + 1) == 0x00)
{
// Trace a websocket event
NetTrace.WriteLine("Draft76 connection termination requested", channel, NetTraceCategory.WebSocket);
length = 0;
channel.Close();
return(ProcessingState.Stop);
}
if (*pBuffer != Start)
{
throw new WebSocketException("WebSocket frame is invalid.");
}
// Search for the next end byte
int endIndex = -1;
for (int i = 0; i < length; ++i)
{
if (*(pBuffer + i) == End)
{
endIndex = i;
break;
}
}
if (endIndex == -1)
{
// Trace a websocket event
NetTrace.WriteLine("Draft76 frame is not complete", channel, NetTraceCategory.WebSocket);
return(ProcessingState.InsufficientData);
}
if (endIndex > MaxSize)
{
throw new WebSocketException("WebSocket frame is too large.");
}
// Throttle the rest
context.Throttle(endIndex + 1);
// Decode the body
var decoded = context.BufferWrite(buffer.Array, buffer.Offset + 1, endIndex - 1);
context.SwitchBuffer(decoded);
// Trace a websocket event
NetTrace.WriteLine("Draft76 frame decoded", channel, NetTraceCategory.WebSocket);
return(ProcessingState.Success);
}