System.ServiceModel.Http2Protocol.Http2Protocol.ReceiveData C# (CSharp) Method

        private byte[] ReceiveData()
        {
            byte[] frameHeader = new byte[8];

            if (!FillBuffer(frameHeader, 0))
            {
                if (this.OnError != null)
                {
                    var connWasLostEx = new Exception("Connection was lost!");
                    this.OnError(this, new ProtocolErrorEventArgs(connWasLostEx));
                }
            }
            byte[] frameBytes = new byte[0];

            int frameLenInBytes = 8 + BinaryHelper.Int32FromBytes(new ArraySegment<byte>(frameHeader, 5, 3));
            frameBytes = new byte[frameLenInBytes];
            Buffer.BlockCopy(frameHeader, 0, frameBytes, 0, frameHeader.Length);

            if (!FillBuffer(frameBytes, 8))
            {
                if (this.OnError != null)
                {
                    var connWasLostEx = new Exception("Connection was lost!");
                    this.OnError(this, new ProtocolErrorEventArgs(connWasLostEx));
                }
            }
            return frameBytes;
        }