Offsets for 64-bit MachO V1

Author: AlexKnauth

src/game_engine/unity/mono.rs

@@ -867,7 +867,26 @@ impl Offsets {
             },
             #[cfg(feature = "std")]
             (true, BinaryFormat::MachO) => match version {
-                Version::V1 => panic!("MachO V1 not supported"),
+                Version::V1 => &Self {
+                    monoassembly_aname: 0x10,
+                    monoassembly_image: 0x58, // matches 64-bit PE V1
+                    monoimage_class_cache: 0x3D0, // matches 64-bit PE V1
+                    monointernalhashtable_table: 0x20,
+                    monointernalhashtable_size: 0x18,
+                    monoclassdef_next_class_cache: 0xF8, // 0x8 less than 64-bit PE V1
+                    monoclassdef_klass: 0x0,
+                    monoclass_name: 0x40, // 0x8 less than 64-bit PE V1
+                    monoclass_fields: 0xA0, // 0x8 less than 64-bit PE V1
+                    monoclassdef_field_count: 0x8C, // 0x8 less than 64-bit PE V1
+                    monoclass_runtime_info: 0xF0, // 0x8 less than 64-bit PE V1
+                    monoclass_vtable_size: 0x18, // MonoVtable.data
+                    monoclass_parent: 0x28, // 0x8 less than 64-bit PE V1
+                    monoclassfield_name: 0x8,
+                    monoclassfield_offset: 0x18,
+                    monoclassruntimeinfo_domain_vtables: 0x8,
+                    monovtable_vtable: 0x0, // UNUSED for V1
+                    monoclassfieldalignment: 0x20,
+                },
                 // 64-bit MachO V2 matches Unity2019_4_2020_3_x64_MachO_Offsets from
                 // https://github.com/hackf5/unityspy/blob/master/src/HackF5.UnitySpy/Offsets/MonoLibraryOffsets.cs#L86
                 Version::V2 => &Self {