More documentation added in the FillObject method.

BlendFile/Reader.cs

@@ -56,19 +56,21 @@ public class Reader {
 
     private void FillObject(Kaitai.BlendFile.FileBlock block, ref object obj, FieldInfo[] fieldMetadata, int startOffset = 0) {
         foreach (var field in fieldMetadata) {
+            //Get the DNAFieldAttribute of the current field
             var attrib = field.GetCustomAttribute<DNAFieldAttribute>();
-            if (attrib == null) continue;
-                
+            if (attrib == null) continue; //should never happen, but means a field has no metadata
+            //Calculate the offset from where the data of the field starts.
+            //Because the order of the fields is not guaranteed we need to compute it each time
             int offset = fieldMetadata.Where(f => f.GetCustomAttribute<DNAFieldAttribute>()!.OriginalIndex < attrib.OriginalIndex)
                 .Sum(f => f.GetCustomAttribute<DNAFieldAttribute>()!.Size) + startOffset;
+            
             int size = attrib.Size;
-                
             var data = new byte[size];
             Array.Copy((byte[])block.Body, offset, data, 0, size);
-                
+            //Convert the data to the correct type
             object? value = ConvertFieldData(data, attrib.OriginalType);
-            if(value == null) continue;
-                
+            if(value == null) continue; //should never happen, but means the data could not be converted
+            //Additionally... some fields might not be nullable so it's better to not assign the value and leave the default one.
             field.SetValue(obj, value);
         }
     }