Microsoft.AspNetCore.WebSockets.Protocol.CommonWebSocket.SendPongReplyAsync C# (CSharp) Method

        private async Task SendPongReplyAsync(CancellationToken cancellationToken)
        {
            await _writeLock.WaitAsync(cancellationToken);
            try
            {
                if (State != WebSocketState.Open)
                {
                    // Output closed, discard the pong.
                    return;
                }

                ArraySegment<byte> dataSegment = new ArraySegment<byte>(_receiveBuffer, _receiveBufferOffset, (int)_frameBytesRemaining);
                if (_unmaskInput)
                {
                    // _frameInProgress.Masked == _unmaskInput already verified
                    Utilities.MaskInPlace(_frameInProgress.MaskKey, dataSegment);
                }

                int mask = GetNextMask();
                FrameHeader header = new FrameHeader(true, Constants.OpCodes.PongFrame, _maskOutput, mask, _frameBytesRemaining);
                if (_maskOutput)
                {
                    Utilities.MaskInPlace(mask, dataSegment);
                }

                ArraySegment<byte> headerSegment = header.Buffer;
                await _stream.WriteAsync(headerSegment.Array, headerSegment.Offset, headerSegment.Count, cancellationToken);
                await _stream.WriteAsync(dataSegment.Array, dataSegment.Offset, dataSegment.Count, cancellationToken);
            }
            finally
            {
                _writeLock.Release();
            }
        }