Fix for fragmented messages and ReliableOrdered

Lidgren.Network/NetConnection.Reliability.cs

@@ -233,7 +233,7 @@ namespace Lidgren.Network
 			}
 		}
 
-		private void ExpectedReliableSequenceArrived(int reliableSlot)
+		private void ExpectedReliableSequenceArrived(int reliableSlot, bool isFragment)
 		{
 			NetBitVector received = m_reliableReceived[reliableSlot];
 
@@ -275,8 +275,11 @@ namespace Lidgren.Network
 								// Found withheld message due for delivery
 								m_owner.LogVerbose("Releasing withheld message " + wm);
 
-								// AcceptMessage
-								m_owner.ReleaseMessage(wm);
+								//Console.WriteLine("Releasing withheld message " + wm);
+
+								// Accept, unless a fragment
+								if (wm.m_fragmentationInfo == null)
+									m_owner.ReleaseMessage(wm);
 
 								foundWithheld = true;
 								withheldList.Remove(wm);
@@ -290,7 +293,13 @@ namespace Lidgren.Network
 						}
 					}
 					if (!foundWithheld)
-						throw new NetException("Failed to find withheld message!");
+					{
+						// probably a fragment; we don't withhold those - advance anyway
+						//Console.WriteLine("Withheld #" + nextExpected + " not found; probably a fragment!");
+						//received[(nextExpected + (NetConstants.NumSequenceNumbers / 2)) % NetConstants.NumSequenceNumbers] = false; // reset for next pass
+						//nextExpected = (nextExpected + 1) % NetConstants.NumSequenceNumbers;
+						throw new NetException("Withheld message not found!");
+					}
 				}
 			}
 

Lidgren.Network/NetConnection.cs

@@ -233,7 +233,7 @@ namespace Lidgren.Network
 
 					ptr = msg.Encode(now, buffer, ptr, this);
 					numIncludedMessages++;
-					
+
 					// room to piggyback some acks?
 					if (m_acknowledgesToSend.Count > 0)
 					{
@@ -339,7 +339,7 @@ namespace Lidgren.Network
 					// Expected sequence number
 					AcceptMessage(mtp, isFragment, channelSequenceNumber, ptr, payloadLengthBits);
 
-					ExpectedReliableSequenceArrived(reliableSlot);
+					ExpectedReliableSequenceArrived(reliableSlot, isFragment);
 					return;
 				}
 
@@ -404,7 +404,7 @@ namespace Lidgren.Network
 				im.m_senderEndpoint = m_remoteEndpoint;
 
 				m_owner.LogVerbose("Withholding " + im + " (waiting for " + m_nextExpectedReliableSequence[reliableSlot] + ")");
-				
+
 				wmList.Add(im);
 
 				return;
@@ -498,7 +498,10 @@ namespace Lidgren.Network
 
 			Buffer.BlockCopy(m_owner.m_receiveBuffer, ptr, im.m_data, offset, payloadLength);
 
-			im.m_bitLength = (8 * (offset + payloadLength));
+			// only enlarge message length if this is latest fragment received
+			int newBitLength = (8 * (offset + payloadLength));
+			if (newBitLength > im.m_bitLength)
+				im.m_bitLength = newBitLength;
 
 			info.Received[nr] = true;
 			info.TotalReceived++;
@@ -567,7 +570,7 @@ namespace Lidgren.Network
 				throw new NetException("Message has already been sent!");
 
 			NetException.Assert(sequenceChannel >= 0 && sequenceChannel < NetConstants.NetChannelsPerDeliveryMethod, "Sequence channel must be between 0 and NetConstants.NetChannelsPerDeliveryMethod (" + NetConstants.NetChannelsPerDeliveryMethod + ")");
-	
+
 			msg.m_type = (NetMessageType)((int)method + sequenceChannel);
 			EnqueueOutgoingMessage(msg);
 		}
@@ -602,7 +605,7 @@ namespace Lidgren.Network
 
 			int numFragments = (msgLen + mtu - 1) / mtu;
 
-			for(int i=0;i<numFragments;i++)
+			for (int i = 0; i < numFragments; i++)
 			{
 				int flen = (i == numFragments - 1 ? (msgLen - (mtu * (numFragments - 1))) : mtu);
 
@@ -684,4 +687,4 @@ namespace Lidgren.Network
 			return "[NetConnection to " + m_remoteEndpoint + " Status: " + m_visibleStatus + "]";
 		}
 	}
-}
+}

Lidgren.Network/NetIncomingMessage.Write.cs

@@ -438,7 +438,17 @@ namespace Lidgren.Network
 			}
 
 			byte[] bytes = Encoding.UTF8.GetBytes(source);
-			InternalEnsureBufferSize(m_bitLength + (bytes.Length > 127 ? 2 * 8 : 1 * 8) + (bytes.Length * 8));
+
+			// determine number of bytes to store length
+			int lenBytesNeeded = 1;
+			uint num1 = (uint)bytes.Length;
+			while (num1 >= 0x80)
+			{
+				num1 = num1 >> 7;
+				lenBytesNeeded++;
+			}
+			InternalEnsureBufferSize(m_bitLength + ((bytes.Length + lenBytesNeeded) * 8));
+
 			WriteVariableUInt32((uint)bytes.Length);
 			Write(bytes);
 		}

Lidgren.Network/NetPeer.Internal.cs

@@ -49,6 +49,8 @@ namespace Lidgren.Network
 		{
 			NetException.Assert(msg.m_status != NetIncomingMessageReleaseStatus.ReleasedToApplication, "Message released to application twice!");
 
+			NetException.Assert(msg.m_fragmentationInfo == null, "Fragment released to application!");
+
 			msg.m_status = NetIncomingMessageReleaseStatus.ReleasedToApplication;
 			m_releasedIncomingMessages.Enqueue(msg);
 			if (m_messageReceivedEvent != null)