From 35c82a31db2c58462e752551794ff03a5eafdeee Mon Sep 17 00:00:00 2001
From: John Hurliman
Date: Fri, 2 Apr 2010 16:25:14 -0700
Subject: Don't append ACKs to zerocoded packets. Although this should fine in
 theory, I'm seeing the viewer ignore or fail to parse ACKs appended to our
 zerocoded packets. This should cut down on viewer->sim resend traffic

---
 .../Region/ClientStack/LindenUDP/LLUDPServer.cs    | 35 ++++++++++++----------
 1 file changed, 20 insertions(+), 15 deletions(-)

diff --git a/OpenSim/Region/ClientStack/LindenUDP/LLUDPServer.cs b/OpenSim/Region/ClientStack/LindenUDP/LLUDPServer.cs
index 850474d..41e41e4 100644
--- a/OpenSim/Region/ClientStack/LindenUDP/LLUDPServer.cs
+++ b/OpenSim/Region/ClientStack/LindenUDP/LLUDPServer.cs
@@ -513,6 +513,7 @@ namespace OpenSim.Region.ClientStack.LindenUDP
             byte flags = buffer.Data[0];
             bool isResend = (flags & Helpers.MSG_RESENT) != 0;
             bool isReliable = (flags & Helpers.MSG_RELIABLE) != 0;
+            bool isZerocoded = (flags & Helpers.MSG_ZEROCODED) != 0;
             LLUDPClient udpClient = outgoingPacket.Client;
 
             if (!udpClient.IsConnected)
@@ -522,23 +523,27 @@ namespace OpenSim.Region.ClientStack.LindenUDP
 
             int dataLength = buffer.DataLength;
 
-            // Keep appending ACKs until there is no room left in the buffer or there are
-            // no more ACKs to append
-            uint ackCount = 0;
-            uint ack;
-            while (dataLength + 5 < buffer.Data.Length && udpClient.PendingAcks.Dequeue(out ack))
+            // NOTE: I'm seeing problems with some viewers when ACKs are appended to zerocoded packets so I've disabled that here
+            if (!isZerocoded)
             {
-                Utils.UIntToBytesBig(ack, buffer.Data, dataLength);
-                dataLength += 4;
-                ++ackCount;
-            }
+                // Keep appending ACKs until there is no room left in the buffer or there are
+                // no more ACKs to append
+                uint ackCount = 0;
+                uint ack;
+                while (dataLength + 5 < buffer.Data.Length && udpClient.PendingAcks.Dequeue(out ack))
+                {
+                    Utils.UIntToBytesBig(ack, buffer.Data, dataLength);
+                    dataLength += 4;
+                    ++ackCount;
+                }
 
-            if (ackCount > 0)
-            {
-                // Set the last byte of the packet equal to the number of appended ACKs
-                buffer.Data[dataLength++] = (byte)ackCount;
-                // Set the appended ACKs flag on this packet
-                buffer.Data[0] = (byte)(buffer.Data[0] | Helpers.MSG_APPENDED_ACKS);
+                if (ackCount > 0)
+                {
+                    // Set the last byte of the packet equal to the number of appended ACKs
+                    buffer.Data[dataLength++] = (byte)ackCount;
+                    // Set the appended ACKs flag on this packet
+                    buffer.Data[0] = (byte)(buffer.Data[0] | Helpers.MSG_APPENDED_ACKS);
+                }
             }
 
             buffer.DataLength = dataLength;
-- 
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