From ff149ae197c1092a9a98ea84a2363fa967490857 Mon Sep 17 00:00:00 2001
From: diva <diva@metaverseink.com>
Date: Sun, 1 Feb 2009 00:59:42 +0000
Subject: [PATCH] Check for the 4096 limitation in dynamic region hyperlinks.

---
 .../Modules/World/WorldMap/MapSearchModule.cs | 49 ++++++++++++++++---
 1 file changed, 43 insertions(+), 6 deletions(-)

diff --git a/OpenSim/Region/Environment/Modules/World/WorldMap/MapSearchModule.cs b/OpenSim/Region/Environment/Modules/World/WorldMap/MapSearchModule.cs
index cb0509209e..7346d92eeb 100644
--- a/OpenSim/Region/Environment/Modules/World/WorldMap/MapSearchModule.cs
+++ b/OpenSim/Region/Environment/Modules/World/WorldMap/MapSearchModule.cs
@@ -110,7 +110,7 @@ namespace OpenSim.Region.Environment.Modules.World.WorldMap
                 if (mapName.Contains(".") && mapName.Contains(":"))
                 {
                     // It probably is a domain name. Try to link to it.
-                    TryLinkRegion(mapName, regionInfos);
+                    TryLinkRegion(remoteClient, mapName, regionInfos);
                 }
             }
 
@@ -154,7 +154,7 @@ namespace OpenSim.Region.Environment.Modules.World.WorldMap
             return (m_scene.SceneGridService is HGSceneCommunicationService);
         }
 
-        private void TryLinkRegion(string mapName, List<RegionInfo> regionInfos)
+        private void TryLinkRegion(IClientAPI client, string mapName, List<RegionInfo> regionInfos)
         {
             string host = "127.0.0.1";
             string portstr;
@@ -183,7 +183,7 @@ namespace OpenSim.Region.Environment.Modules.World.WorldMap
             {
                 uint xloc = (uint)(random.Next(0, Int16.MaxValue));
                 RegionInfo regInfo;
-                bool success = TryCreateLink(xloc, 0, port, host, out regInfo);
+                bool success = TryCreateLink(client, xloc, 0, port, host, out regInfo);
                 if (success)
                 {
                     regInfo.RegionName = mapName;
@@ -192,7 +192,7 @@ namespace OpenSim.Region.Environment.Modules.World.WorldMap
             }
         }
 
-        private bool TryCreateLink(uint xloc, uint yloc, uint externalPort, string externalHostName, out RegionInfo regInfo)
+        private bool TryCreateLink(IClientAPI client, uint xloc, uint yloc, uint externalPort, string externalHostName, out RegionInfo regInfo)
         {
             m_log.DebugFormat("[HGrid]: Dynamic link to {0}:{1}, in {2}-{3}", externalHostName, externalPort, xloc, yloc);
 
@@ -219,14 +219,51 @@ namespace OpenSim.Region.Environment.Modules.World.WorldMap
             }
             catch (Exception e)
             {
-                m_log.Warn("[HGrid] Unable to dynamically link region: " + e);
+                m_log.Warn("[HGrid] Unable to dynamically link region: " + e.Message);
+                return false;
+            }
+
+            if (!Check4096(client, regInfo))
+            {
                 return false;
             }
 
             m_log.Debug("[HGrid] Dynamic link region succeeded");
-
             return true;
         }
 
+        /// <summary>
+        /// Cope with this viewer limitation.
+        /// </summary>
+        /// <param name="regInfo"></param>
+        /// <returns></returns>
+        private bool Check4096(IClientAPI client, RegionInfo regInfo)
+        {
+            ulong realHandle;
+            if (UInt64.TryParse(regInfo.regionSecret, out realHandle))
+            {
+                uint x, y;
+                Utils.LongToUInts(realHandle, out x, out y);
+                x = x / Constants.RegionSize;
+                y = y / Constants.RegionSize;
+
+                if ((Math.Abs((int)m_scene.RegionInfo.RegionLocX - (int)x) >= 4096) ||
+                    (Math.Abs((int)m_scene.RegionInfo.RegionLocY - (int)y) >= 4096))
+                {
+                    m_scene.CommsManager.GridService.RegisterRegion(regInfo);
+                    m_log.Debug("[HGrid]: Region deregistered.");
+                    client.SendAlertMessage("Region is too far (" + x + ", " + y + ")");
+                    return false;
+                }
+                return true;
+            }
+            else
+            {
+                m_scene.CommsManager.GridService.RegisterRegion(regInfo);
+                m_log.Debug("[HGrid]: Gnomes. Region deregistered.");
+                return false;
+            }
+        }
+
     }
 }