System.Net.WebConnection.ReadDone C# (CSharp) Method

		static void ReadDone (IAsyncResult result)
		{
			WebConnection cnc = (WebConnection) result.AsyncState;
			WebConnectionData data = cnc.Data;
			Stream ns = cnc.nstream;
			if (ns == null) {
				cnc.Close (true);
				return;
			}

			int nread = -1;
			try {
				nread = ns.EndRead (result);
			} catch (Exception e) {
				cnc.HandleError (WebExceptionStatus.ReceiveFailure, e, "ReadDone1");
				return;
			}

			if (nread == 0) {
				cnc.HandleError (WebExceptionStatus.ReceiveFailure, null, "ReadDone2");
				return;
			}

			if (nread < 0) {
				cnc.HandleError (WebExceptionStatus.ServerProtocolViolation, null, "ReadDone3");
				return;
			}

			int pos = -1;
			nread += cnc.position;
			if (cnc.readState == ReadState.None) { 
				Exception exc = null;
				try {
					pos = cnc.GetResponse (cnc.buffer, nread);
				} catch (Exception e) {
					exc = e;
				}

				if (exc != null) {
					cnc.HandleError (WebExceptionStatus.ServerProtocolViolation, exc, "ReadDone4");
					return;
				}
			}

			if (cnc.readState != ReadState.Content) {
				int est = nread * 2;
				int max = (est < cnc.buffer.Length) ? cnc.buffer.Length : est;
				byte [] newBuffer = new byte [max];
				Buffer.BlockCopy (cnc.buffer, 0, newBuffer, 0, nread);
				cnc.buffer = newBuffer;
				cnc.position = nread;
				cnc.readState = ReadState.None;
				InitRead (cnc);
				return;
			}

			cnc.position = 0;

			WebConnectionStream stream = new WebConnectionStream (cnc);

			string contentType = data.Headers ["Transfer-Encoding"];
			cnc.chunkedRead = (contentType != null && contentType.IndexOf ("chunked", StringComparison.OrdinalIgnoreCase) != -1);
			if (!cnc.chunkedRead) {
				stream.ReadBuffer = cnc.buffer;
				stream.ReadBufferOffset = pos;
				stream.ReadBufferSize = nread;
				stream.CheckResponseInBuffer ();
			} else if (cnc.chunkStream == null) {
				try {
					cnc.chunkStream = new ChunkStream (cnc.buffer, pos, nread, data.Headers);
				} catch (Exception e) {
					cnc.HandleError (WebExceptionStatus.ServerProtocolViolation, e, "ReadDone5");
					return;
				}
			} else {
				cnc.chunkStream.ResetBuffer ();
				try {
					cnc.chunkStream.Write (cnc.buffer, pos, nread);
				} catch (Exception e) {
					cnc.HandleError (WebExceptionStatus.ServerProtocolViolation, e, "ReadDone6");
					return;
				}
			}

			data.stream = stream;
			
			if (!ExpectContent (data.StatusCode) || data.request.Method == "HEAD")
				stream.ForceCompletion ();

			data.request.SetResponseData (data);
		}