private void WriteData(WebSocketFragment fragment)
{
var fragmentData = fragment.GetBuffer();
try
{
_stream.BeginWrite(fragmentData, 0, fragmentData.Length, AsyncWriteHandler, _stream);
}
catch (Exception ex)
{
Debug.WriteLine("Error while starting write to network stream: {0}", ex);
}
}
public WebSocketFragmentRecievedEventArgs(WebSocketFragment fragment)
{
Fragment = fragment;
}
protected void SendPongFrame(WebSocketFragment fragment)
{
var pongFragment = new WebSocketFragment(true, OpCode.Pong, fragment.PayloadString);
SendFragment(pongFragment);
}
private void CheckForFrame()
{
if (_dataBuffer.Length == 0) return;
byte[] buffer = _dataBuffer.GetBuffer();
long dataLength = _dataBuffer.Length;
var fragmentStart = 0;
while (fragmentStart < dataLength)
{
if (_currentFragmentLength == 0)
{
if (dataLength >= 2)
{
_currentFragmentLength = 2;
var payloadLength = buffer[fragmentStart + 1] & 0x7F;
if (payloadLength <= 125)
{
_currentFragmentLength += payloadLength;
}
if (payloadLength == 126 && dataLength >= 4)
{
_currentFragmentLength += buffer[fragmentStart + 2] << 8 | buffer[fragmentStart + 3];
_currentFragmentLength += 2;
}
if (payloadLength == 127 && dataLength >= 10)
{
_currentFragmentLength +=
(buffer[fragmentStart + 2] << 56 |
buffer[fragmentStart + 3] << 48 |
buffer[fragmentStart + 4] << 40 |
buffer[fragmentStart + 5] << 32 |
buffer[fragmentStart + 6] << 24 |
buffer[fragmentStart + 7] << 16 |
buffer[fragmentStart + 8] << 8 |
buffer[fragmentStart + 9]);
_currentFragmentLength += 8;
}
if ((buffer[fragmentStart + 1] & 0x80) != 0) _currentFragmentLength += 4;
}
else
{
return;
}
}
if ((dataLength - fragmentStart) < _currentFragmentLength)
{
_dataBuffer = new MemoryStream();
_dataBuffer.Write(buffer, fragmentStart, (int)(dataLength - fragmentStart));
return;
}
var fragmentBuffer = new byte[_currentFragmentLength];
Array.Copy(buffer, fragmentStart, fragmentBuffer, 0, _currentFragmentLength);
var fragment = new WebSocketFragment(fragmentBuffer);
OnWebSocketFragmentRecieved(this, new WebSocketFragmentRecievedEventArgs(fragment));
fragmentStart += _currentFragmentLength;
if (fragmentStart == dataLength)
{
_dataBuffer = new MemoryStream();
_currentFragmentLength = 0;
return;
}
_currentFragmentLength = 0;
}
}
protected WebSocketFragment ConcatFragments()
{
var data = new MemoryStream();
foreach (var f in _fragmentsList)
{
var payload = f.PayloadBinary;
data.Write(payload, 0, payload.Length);
}
var firstFragment = _fragmentsList[0];
var fragment = new WebSocketFragment(true, firstFragment.OpCode, data.GetBuffer(), null, firstFragment.RSV1,
firstFragment.RSV2, firstFragment.RSV3);
_fragmentsList.Clear();
return fragment;
}
protected void CloseConnection(WebSocketFragment fragment)
{
SendFragment(fragment);
SendQueueEmpty += (s, e) => CloseNetworkStream();
}
public void SendText(string message)
{
var fragment = new WebSocketFragment(true, OpCode.TextFrame, message);
SendFragment(fragment);
}
public void SendFragment(WebSocketFragment fragment)
{
if (Status != WebSocketConnectionStatus.Open) throw new InvalidOperationException("Connection is not open");
WriteData(fragment);
}
public void CloseConnection(string reason)
{
var fragment = new WebSocketFragment(true, OpCode.ConnectionClose, reason);
SendFragment(fragment);
Status = WebSocketConnectionStatus.Closing;
OnClosing(this, new WebSocketConnectionStateChangeEventArgs { Connection = this });
}