From b6fe83965ac3f7d760a11c3d99b512ce22c2cf96 Mon Sep 17 00:00:00 2001
From: Adam Frisby <adam@sinewavecompany.com>
Date: Fri, 2 Aug 2024 03:11:00 +1000
Subject: [PATCH] * Fixes a subtle bug with TextureEntryFace where the face
 bits is incorrect. This is because it only uses 32-bits, the official viewer
 uses 64-bits, and the overflow matters. * Adds a .Valid property to
 TextureEntryFace - sometimes it is not, and will throw exceptions if you
 actually try use anything in this class. At least have the ability to check
 first.

---
 LibreMetaverse/Primitives/TextureEntry.cs | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/LibreMetaverse/Primitives/TextureEntry.cs b/LibreMetaverse/Primitives/TextureEntry.cs
index 7f2605f5..5d34278b 100644
--- a/LibreMetaverse/Primitives/TextureEntry.cs
+++ b/LibreMetaverse/Primitives/TextureEntry.cs
@@ -212,6 +212,14 @@ namespace OpenMetaverse
 
             #region Properties
 
+            public bool Valid
+            {
+                get
+                {
+                    return DefaultTexture != null;
+                }
+            }
+
             /// <summary></summary>
             internal byte material
             {
@@ -721,18 +729,18 @@ namespace OpenMetaverse
                     return;
 
                 uint bitfieldSize = 0;
-                uint faceBits = 0;
+                UInt64 faceBits = 0;
                 int i = pos;
 
                 #region Texture
                 DefaultTexture.TextureID = new UUID(data, i);
                 i += 16;
-
+                
                 while (ReadFaceBitfield(data, ref i, ref faceBits, ref bitfieldSize))
                 {
                     UUID tmpUUID = new UUID(data, i);
                     i += 16;
-
+                    
                     for (uint face = 0, bit = 1; face < bitfieldSize; face++, bit <<= 1)
                     {
                         if ((faceBits & bit) != 0)
@@ -1198,7 +1206,7 @@ namespace OpenMetaverse
                     array[i] = uint.MaxValue;
             }
 
-            private bool ReadFaceBitfield(byte[] data, ref int pos, ref uint faceBits, ref uint bitfieldSize)
+            private bool ReadFaceBitfield(byte[] data, ref int pos, ref UInt64 faceBits, ref uint bitfieldSize)
             {
                 faceBits = 0;
                 bitfieldSize = 0;