From 8060d132b943f183bc75cbbcfeaa0b8b9631bc5e Mon Sep 17 00:00:00 2001
From: UbitUmarov <ajlduarte@sapo.pt>
Date: Thu, 6 Feb 2020 19:16:23 +0000
Subject: [PATCH] mantis 8651: try to improve notecards HG sharing ( not
 tested)

---
 OpenSim/Framework/SLUtil.cs                   | 64 +++++++++++++++++++
 .../Region/Framework/Scenes/UuidGatherer.cs   | 18 +++++-
 2 files changed, 81 insertions(+), 1 deletion(-)

diff --git a/OpenSim/Framework/SLUtil.cs b/OpenSim/Framework/SLUtil.cs
index 0acb3b2ca0..da07f791e6 100644
--- a/OpenSim/Framework/SLUtil.cs
+++ b/OpenSim/Framework/SLUtil.cs
@@ -29,6 +29,7 @@ using OpenMetaverse;
 using System;
 using System.Collections.Generic;
 using System.Globalization;
+using System.Text.RegularExpressions;
 
 namespace OpenSim.Framework
 {
@@ -795,5 +796,68 @@ namespace OpenSim.Framework
             item.ID = UUID.Random();
             return item;
         }
+
+        public static List<UUID> GetEmbeddedAssetIDs(byte[] data)
+        {
+            if (data == null || data.Length < 60)
+                return null;
+
+            string note = Util.UTF8.GetString(data);
+            if (String.IsNullOrWhiteSpace(note))
+                return null;
+
+            // waste some time checking rigid versions
+            string tmpStr = note.Substring(0, 21);
+            if (!tmpStr.Equals("Linden text version 2"))
+                return null;
+
+            tmpStr = note.Substring(24, 25);
+            if (!tmpStr.Equals("LLEmbeddedItems version 1"))
+                return null;
+
+            tmpStr = note.Substring(52,5);
+            if (!tmpStr.Equals("count"))
+                return null;
+
+            int limit = note.Length - 57 - 2;
+            if (limit > 8)
+                limit = 8;
+
+            int indx = note.IndexOfAny(seps, 57, limit);
+            if(indx < 0)
+                return null;
+
+            if (!int.TryParse(note.Substring(57, indx - 57), out int count))
+                return null;
+
+            List<UUID> ids = new List<UUID>();
+            while(count > 0)
+            {
+                string valuestr;
+                UUID assetID = UUID.Zero;
+                indx = note.IndexOf('}'); // skip to end of permissions
+                indx = getField(note, indx, "asset_id", false, out valuestr);
+                if (indx < 0)
+                {
+                    indx = getField(note, indx, "shadow_id", false, out valuestr);
+                    if (indx < 0)
+                        return null;
+                    if (!UUID.TryParse(valuestr, out assetID))
+                        return null;
+                    assetID = deMoronize(assetID);
+                }
+                else
+                {
+                    if (!UUID.TryParse(valuestr, out assetID))
+                        return null;
+                }
+                ids.Add(assetID);
+                --count;
+            }
+
+            if(ids.Count == 0)
+                return null;
+            return ids;
+        }
     }
 }
diff --git a/OpenSim/Region/Framework/Scenes/UuidGatherer.cs b/OpenSim/Region/Framework/Scenes/UuidGatherer.cs
index d0c48b7f7e..3807c21813 100644
--- a/OpenSim/Region/Framework/Scenes/UuidGatherer.cs
+++ b/OpenSim/Region/Framework/Scenes/UuidGatherer.cs
@@ -364,7 +364,7 @@ namespace OpenSim.Region.Framework.Scenes
                 }
                 else if ((sbyte)AssetType.Notecard == assetType)
                 {
-                    RecordTextEmbeddedAssetUuids(assetBase);
+                    RecordNoteCardEmbeddedAssetUuids(assetBase);
                 }
                 else if ((sbyte)AssetType.LSLText == assetType)
                 {
@@ -546,6 +546,22 @@ namespace OpenSim.Region.Framework.Scenes
             }
         }
 
+        private void RecordNoteCardEmbeddedAssetUuids(AssetBase textAsset)
+        {
+            List<UUID> ids = SLUtil.GetEmbeddedAssetIDs(textAsset.Data);
+            if(ids == null)
+                return;
+
+            for(int i = 0; i < ids.Count; ++i)
+            {
+                if (ids[i] == UUID.Zero)
+                    continue;
+                if (!UncertainAssetsUUIDs.Contains(ids[i]))
+                    UncertainAssetsUUIDs.Add(ids[i]);
+                AddForInspection(ids[i]);
+            }
+        }
+
         /// <summary>
         /// Record the uuids referenced by the given wearable asset
         /// </summary>