Fixed some encoding errors.

BinaryFormat/Chunks/PROP.cs

@@ -463,6 +463,13 @@ namespace RobloxFiles.BinaryFormat.Chunks
                     readProperties(i =>
                     {
                         int instId = instIds[i];
+
+                        if (instId >= File.NumInstances)
+                        {
+                            RobloxFile.LogError($"Got out of bounds referent index in {ClassName}.{Name}!");
+                            return null;
+                        }
+
                         return instId >= 0 ? File.Instances[instId] : null;
                     });
 
@@ -1015,7 +1022,12 @@ namespace RobloxFiles.BinaryFormat.Chunks
                         if (prop.Value != null)
                         {
                             Instance value = prop.CastValue<Instance>();
-                            referent = int.Parse(value.Referent);
+
+                            if (value.IsDescendantOf(File))
+                            {
+                                string refValue = value.Referent;
+                                int.TryParse(refValue, out referent);
+                            }
                         }
 
                         InstanceIds.Add(referent);

Tokens/BinaryString.cs

@@ -22,6 +22,9 @@ namespace RobloxFiles.Tokens
 
         public void WriteProperty(Property prop, XmlDocument doc, XmlNode node)
         {
+            if (!prop.HasRawBuffer)
+                return;
+
             byte[] data = prop.RawBuffer;
             string value = Convert.ToBase64String(data);
             

Tree/Attributes.cs

@@ -158,10 +158,8 @@ namespace RobloxFiles
 
         internal void WriteString(string value)
         {
-            int length = value.Length;
-            Writer.Write(length);
-
             byte[] utf8 = Encoding.UTF8.GetBytes(value);
+            Writer.Write(utf8.Length);
             Writer.Write(utf8);
         }
 
@@ -239,6 +237,10 @@ namespace RobloxFiles
             }
         }
 
+        public Attributes() : base()
+        {
+        }
+
         internal Attributes(BinaryReader reader)
         {
             Initialize(reader);

Tree/Instance.cs

@@ -64,7 +64,7 @@ namespace RobloxFiles
         public HashSet<string> Tags { get; } = new HashSet<string>();
 
         /// <summary>The attributes defined for this Instance.</summary>
-        private Attributes AttributesImpl;
+        private Attributes AttributesImpl = new Attributes();
         
         /// <summary>The public readonly access point of the attributes on this Instance.</summary>
         public IReadOnlyDictionary<string, Attribute> Attributes => AttributesImpl;
@@ -161,7 +161,9 @@ namespace RobloxFiles
             if (key.Length > 100)
                 return false;
 
-            if (!Attribute.SupportsType<T>())
+            Type type = value.GetType();
+
+            if (!Attribute.SupportsType(type))
                 return false;
 
             var attr = new Attribute(value);
@@ -170,7 +172,6 @@ namespace RobloxFiles
             return true;
         }
 
-
         /// <summary>Returns true if this Instance is an ancestor to the provided Instance.</summary>
         /// <param name="descendant">The instance whose descendance will be tested against this Instance.</param>
         public bool IsAncestorOf(Instance descendant)