another serialization bug fixed

Author: Zweronz

Source/AssetRipper.Import/Structure/Assembly/Mono/MonoType.cs

@@ -85,10 +85,10 @@ private static Field MakeSerializableField(string name, TypeSignature typeSignat
 						fieldType = new MonoType(typeDefinition, typeCache);
 					}
 
-					return new Field(fieldType, arrayDepth, name);
+					return new Field(fieldType, arrayDepth, name, typeDefinition.IsStruct());
 
 				case CorLibTypeSignature corLibTypeSignature:
-					return new Field(SerializablePrimitiveType.GetOrCreate(corLibTypeSignature.ToPrimitiveType()), arrayDepth, name);
+					return new Field(SerializablePrimitiveType.GetOrCreate(corLibTypeSignature.ToPrimitiveType()), arrayDepth, name, corLibTypeSignature.IsStruct());
 
 				case SzArrayTypeSignature szArrayTypeSignature:
 					return MakeSerializableField(name, szArrayTypeSignature.BaseType, arrayDepth + 1, typeCache);
@@ -108,7 +108,7 @@ private static Field MakeSerializableField(string name, GenericInstanceTypeSigna
 				return MakeSerializableField(name, typeSignature.TypeArguments[0], arrayDepth + 1, typeCache);
 			}
 
-			return new(new MonoType(typeSignature, typeCache), arrayDepth, name);
+			return new(new MonoType(typeSignature, typeCache), arrayDepth, name, typeSignature.IsStruct());
 		}
 	}
 }

Source/AssetRipper.Import/Structure/Assembly/Serializable/SerializableField.cs

@@ -34,6 +34,11 @@ public void Read(ref EndianSpanReader reader, UnityVersion version, TransferInst
 				return;
 			}
 
+			if (version.IsLess(4, 5, 0) && etalon.IsStruct && !etalon.Type.IsEngineStruct())
+			{
+				return;
+			}
+
 			switch (etalon.Type.Type)
 			{
 				case PrimitiveType.Bool:
@@ -405,6 +410,11 @@ public YamlNode ExportYaml(IExportContainer container, in SerializableType.Field
 				return null;
 			}
 
+			if (container.Version.IsLess(4, 5, 0) && etalon.IsStruct && !etalon.Type.IsEngineStruct())
+			{
+				return null;
+			}
+
 			if (etalon.IsArray)
 			{
 				if (etalon.Type.Type == PrimitiveType.Complex)
@@ -528,6 +538,11 @@ internal void CopyValues(SerializableField source, UnityVersion version, int dep
 				return;
 			}
 
+			if (version.IsLess(4, 5, 0) && etalon.IsStruct && !etalon.Type.IsEngineStruct())
+			{
+				return;
+			}
+
 			if (etalon.IsArray)
 			{
 				PValue = default;

Source/AssetRipper.Import/Structure/Assembly/Serializable/SerializableType.cs

@@ -9,11 +9,12 @@ public abstract class SerializableType
 	{
 		public readonly struct Field
 		{
-			public Field(SerializableType type, int arrayDepth, string name)
+			public Field(SerializableType type, int arrayDepth, string name, bool isStruct = false)
 			{
 				Type = type;
 				ArrayDepth = arrayDepth;
 				Name = name;
+				IsStruct = isStruct;
 			}
 
 			public override string? ToString()
@@ -29,6 +30,7 @@ public Field(SerializableType type, int arrayDepth, string name)
 			public SerializableType Type { get; }
 			public int ArrayDepth { get; }
 			public bool IsArray => ArrayDepth > 0;
+			public bool IsStruct { get; }
 			public string Name { get; }
 		}