System.Net.WebSockets.WebSocketBuffer.ConvertCloseBuffer C# (CSharp) Method

        internal void ConvertCloseBuffer(WebSocketProtocolComponent.Action action,
            Interop.WebSocket.Buffer buffer,
            out WebSocketCloseStatus closeStatus,
            out string reason)
        {
            ThrowIfDisposed();
            IntPtr bufferData;
            uint bufferLength;
            closeStatus = (WebSocketCloseStatus)buffer.CloseStatus.CloseStatus;

            UnwrapWebSocketBuffer(buffer, WebSocketProtocolComponent.BufferType.Close, out bufferData, out bufferLength);

            if (bufferData == IntPtr.Zero)
            {
                reason = null;
            }
            else
            {
                ArraySegment<byte> reasonBlob;
                if (this.IsNativeBuffer(bufferData, bufferLength))
                {
                    reasonBlob = new ArraySegment<byte>(_internalBuffer.Array,
                        this.GetOffset(bufferData),
                        (int)bufferLength);
                }
                else
                {
                    Debug.Assert(false, "'buffer' MUST reference a memory segment within the pinned InternalBuffer.");
                    // Indicates a violation in the contract with native Websocket.dll and could indicate 
                    // memory corruption because the internal buffer is shared between managed and native code
                    throw new AccessViolationException();
                }

                // No need to wrap DecoderFallbackException for invalid UTF8 chacters, because
                // Encoding.UTF8 will not throw but replace invalid characters instead.
                reason = Encoding.UTF8.GetString(reasonBlob.Array, reasonBlob.Offset, reasonBlob.Count);
            }
        }