IL2CPP: Change metadata and binary to derive from BinaryObjectStream

Il2CppInspector.Common/FileFormatStreams/UBReader.cs

@@ -0,0 +1,46 @@
+/*
+    Copyright 2017-2020 Katy Coe - http://www.djkaty.com - https://github.com/djkaty
+
+    All rights reserved.
+*/
+
+using System.IO;
+using NoisyCowStudios.Bin2Object;
+
+namespace Il2CppInspector
+{
+    internal class UBReader : FileFormatStream<UBReader>
+    {
+        private FatHeader header;
+
+        public override string DefaultFilename => "app";
+
+        protected override bool Init() {
+            // Fat headers are always big-endian regardless of architectures
+            Endianness = Endianness.Big;
+
+            header = ReadObject<FatHeader>();
+
+            if ((UB) header.Magic != UB.FAT_MAGIC)
+                return false;
+
+            NumImages = header.NumArch;
+            return true;
+        }
+
+        public override IFileFormatStream this[uint index] {
+            get {
+                Position = 0x8 + 0x14 * index; // sizeof(FatHeader), sizeof(FatArch)
+                Endianness = Endianness.Big;
+
+                var arch = ReadObject<FatArch>();
+
+                Position = arch.Offset;
+                Endianness = Endianness.Little;
+
+                using var s = new MemoryStream(ReadBytes((int) arch.Size));
+                return (IFileFormatStream) MachOReader32.Load(s, LoadOptions, OnStatusUpdate) ?? MachOReader64.Load(s, LoadOptions, OnStatusUpdate);
+            }
+        }
+    }
+}