public static WebSocketMessage FromStream(WebSocketMessage msg, Stream stream)
{
byte[] header_proto = stream.ReadSafe(2);
byte fin_rsv = (byte)((header_proto[0] & 0xF0) >> 4);
byte opcode = (byte)(header_proto[0] & 0x0F);
bool mask = (header_proto[1] & 0x80) == 0x80;
ulong length = (ulong)(header_proto[1] & 0x7F);
msg.Final = (fin_rsv & 0x08) == 0x08;
msg.Opcode = (Opcode)opcode;
msg.Masked = mask;
if (fin_rsv != 0x08)
{
Log.Warn("Invalid fin_rsv!");
Log.Debug("\tfin and rsv: {0}", Convert.ToString(fin_rsv, 2));
Log.Debug("\topcode: {0}", opcode);
Log.Debug("\tmask: {0}", mask ? 1 : 0);
Log.Debug("\tlength: {0}", length);
return(null);
}
#if EXTENDED_WEBSOCKET_DEBUG
Log.Debug("Incoming packet:");
Log.Debug("\tfin and rsv: {0}", Convert.ToString(fin_rsv, 2));
Log.Debug("\topcode: {0}", opcode);
Log.Debug("\tmask: {0}", mask ? 1 : 0);
Log.Debug("\tlength: {0}", length); * /
#endif
if (length == 126)
{
length = BitConverter.ToUInt16(stream.ReadSafe(2, true), 0);
#if EXTENDED_WEBSOCKET_DEBUG
Log.Debug("Extended packet length(0-2^16): {0}", length);
#endif
}
else if (length == 127)
{
length = BitConverter.ToUInt64(stream.ReadSafe(8, true), 0);
#if EXTENDED_WEBSOCKET_DEBUG
Log.Debug("Extended packet length(0-2^64): {0}", length);
#endif
}
byte[] mask_key = new byte[4];
if (mask)
{
mask_key = stream.ReadSafe(4);
#if EXTENDED_WEBSOCKET_DEBUG
Log.Debug("Mask key is {0}", BitConverter.ToString(mask_key).Replace("-", "").ToLower());
#endif
}
msg.Mask = mask_key;
if (length == 0)
{
msg.Payload = new byte[0];
return(msg);
}
byte[] buf = stream.ReadSafe((uint)length);
if (mask)
{
buf = DecodeMask(buf, mask_key);
}
msg.Payload = buf;
return(msg);
}
public static WebSocketMessage FromStream(Stream stream)
{
WebSocketMessage ret = new WebSocketMessage();
return(FromStream(ret, stream));
}
public void SendText(string data)
{
Send(WebSocketMessage.Create(Encoding.UTF8.GetBytes(data), Opcode.Text, MaskOutgoing));
}
public void SendPing()
{
Send(WebSocketMessage.Create(new byte[0], Opcode.Ping, MaskOutgoing));
}
public void SendBinary(byte[] data)
{
Send(WebSocketMessage.SerializeInPlace(true, MaskOutgoing, Opcode.Binary, data, new byte[4]));
}
public void Send(WebSocketMessage message)
{
byte[] buf = message.Serialize();
Send(buf);
}
private void ReceiveLoop()
{
WebSocketMessage message = new WebSocketMessage();
while (Client.Connected && !Closed)
{
try
{
var result = WebSocketMessage.FromStream(message, NetworkStream);
if (result == null)
{
Close();
return;
}
if (message.Final)
{
if (FragmentStart != null)
{
if (message.Opcode != Opcode.Continuation)
{
// control message
}
else
{
FragmentBuffer.Write(message.Payload, 0, message.Payload.Length);
if (OnDataReceived != null)
{
OnDataReceived(this, FragmentStart, FragmentBuffer.ToArray());
}
ReceiveQueue.Enqueue(FragmentBuffer.ToArray());
FragmentStart = null;
FragmentBuffer.SetLength(0);
}
}
else
{
switch (message.Opcode)
{
case Opcode.Binary:
case Opcode.Text:
ReceiveQueue.Enqueue(message.Payload);
if (OnDataReceived != null)
{
OnDataReceived(this, message, message.Payload);
}
break;
case Opcode.Ping:
Send(WebSocketMessage.Create(message.Payload, Opcode.Pong, MaskOutgoing));
Log.Debug("Received ping");
break;
case Opcode.Pong:
Log.Debug("Received pong");
break;
case Opcode.Close:
Send(WebSocketMessage.Create(new byte[0], Opcode.Close, MaskOutgoing));
Close();
Log.Debug("Received WebSocket close, disconnected");
return;
}
}
}
else
{
if (FragmentStart == null)
{
// start receiving a fragment
FragmentStart = message;
FragmentBuffer.SetLength(0);
FragmentBuffer.Write(message.Payload, 0, message.Payload.Length);
}
else
{
if (message.Opcode != Opcode.Continuation)
{
// illegal
}
else
{
FragmentBuffer.Write(message.Payload, 0, message.Payload.Length);
}
}
}
}
catch (Exception ex)
{
Log.Error(ex);
Close();
}
}
}