Initial commit

Dalamud/Game/Internal/BaseAddressResolver.cs

@@ -0,0 +1,48 @@
+using System;
+using System.Runtime.InteropServices;
+
+namespace Dalamud.Game.Internal {
+    public abstract class BaseAddressResolver {
+        protected bool IsResolved { get; set; }
+        
+        public void Setup(SigScanner scanner) {
+            // Because C# don't allow to call virtual function while in ctor
+            // we have to do this shit :\
+            
+            if (IsResolved) {
+                return;
+            }
+            
+            if (scanner.Is32BitProcess) {
+                Setup32Bit(scanner);
+            } else {
+                Setup64Bit(scanner);
+            }
+            SetupInternal(scanner);
+            
+            IsResolved = true;
+        }
+        
+        protected virtual void Setup32Bit(SigScanner scanner) {
+            throw new NotSupportedException("32 bit version is not supported.");
+        }
+
+        protected virtual void Setup64Bit(SigScanner sig) {
+            throw new NotSupportedException("64 bit version is not supported.");
+        }
+
+        protected virtual void SetupInternal(SigScanner scanner) {
+            // Do nothing 
+        }
+
+        protected T GetVirtualFunction<T>(IntPtr address, int vtableOffset, int count) where T : class {
+            // Get vtable
+            var vtable = Marshal.ReadIntPtr(address, vtableOffset);
+            
+            // Get an address to the function
+            var functionAddress = Marshal.ReadIntPtr(vtable, IntPtr.Size * count);
+            
+            return Marshal.GetDelegateForFunctionPointer<T>(functionAddress);
+        }
+    }
+}