From dda58af124d6a57b6e8ed3c1bbecbba8a2f67431 Mon Sep 17 00:00:00 2001
From: Katy Coe <djkaty@start.no>
Date: Tue, 22 Oct 2019 23:41:18 +0200
Subject: [PATCH] Add Mach-O relocation processing stub

---
 .../FileFormatReaders/FormatLayouts/MachO.cs      | 14 +++++++++++++-
 Il2CppInspector/FileFormatReaders/MachOReader.cs  | 15 ++++++++++++++-
 2 files changed, 27 insertions(+), 2 deletions(-)

diff --git a/Il2CppInspector/FileFormatReaders/FormatLayouts/MachO.cs b/Il2CppInspector/FileFormatReaders/FormatLayouts/MachO.cs
index cac1106..f177024 100644
--- a/Il2CppInspector/FileFormatReaders/FormatLayouts/MachO.cs
+++ b/Il2CppInspector/FileFormatReaders/FormatLayouts/MachO.cs
@@ -75,7 +75,7 @@ namespace Il2CppInspector
         public uint ImageOffset;
         public uint Align;
         public uint ImageRelocOffset;
-        public uint NumRelocEntries;
+        public int NumRelocEntries;
         public uint Flags;
         public uint Reserved1;
         public TWord Reserved2;
@@ -104,4 +104,16 @@ namespace Il2CppInspector
         public ushort n_desc;
         public TWord n_value;
     }
+
+    internal class MachO_relocation_info
+    {
+        public int r_address;
+        public uint r_data;
+
+        public uint r_symbolnum => r_data & 0x00ffffff;
+        public bool r_pcrel => ((r_data >> 24) & 1) == 1;
+        public uint r_length => (r_data >> 25) & 3;
+        public bool r_extern => ((r_data >> 27) & 1) == 1;
+        public uint r_type => r_data >> 28;
+    }
 }
diff --git a/Il2CppInspector/FileFormatReaders/MachOReader.cs b/Il2CppInspector/FileFormatReaders/MachOReader.cs
index b7881e1..826ead9 100644
--- a/Il2CppInspector/FileFormatReaders/MachOReader.cs
+++ b/Il2CppInspector/FileFormatReaders/MachOReader.cs
@@ -129,7 +129,20 @@ namespace Il2CppInspector
             }
 
             // Must find LC_FUNCTION_STARTS load command
-            return (funcTab != null);
+            if (funcTab == null)
+                return false;
+
+            // Process relocations
+            foreach (var section in sections) {
+                var rels = ReadArray<MachO_relocation_info>(section.ImageRelocOffset, section.NumRelocEntries);
+
+                // TODO: Implement
+                if (rels.Any()) {
+                    Console.WriteLine("Mach-O file contains relocations (feature not yet implemented)");
+                    break;
+                }
+            }
+            return true;
         }
 
         public override uint[] GetFunctionTable() {