1 files changed, 143 insertions, 0 deletions
diff --git a/BiomeVisualiser/WndProcThunk.h b/BiomeVisualiser/WndProcThunk.h
new file mode 100644
index 000000000..6f33b5c3f
--- /dev/null
+++ b/BiomeVisualiser/WndProcThunk.h
@@ -0,0 +1,143 @@
+
+// WndProcThunk.h
+
+// Interfaces to the CWndProcThunk class responsible for WNDPROC class-thunking
+// For details, see http://www.hackcraft.net/cpp/windowsThunk/thiscall/
+// Also available is a CDlgProcThunk class doing the same work for DIALOGPROC
+
+// MD: Made NX-compat by allocating the code structure using VirtualAlloc(..., PAGE_EXECUTE_READWRITE)
+
+
+
+
+
+// fwd:
+template <class W> class CWndProcThunk;
+
+
+
+
+
+#ifndef WNDPROCTHUNK_H_INCLUDED
+#define WNDPROCTHUNK_H_INCLUDED
+
+
+
+
+template<typename To, typename From> inline To union_cast(From fr) throw()
+{
+  union
+  {
+		From f;
+		To t;
+  } uc;
+  uc.f = fr;
+  return uc.t;
+} 
+
+
+
+
+
+#pragma warning(push)
+#pragma warning(disable : 4355)
+
+#if defined(_M_IX86)
+
+#pragma pack(push,1)
+
+template <class W> class CWndProcThunk
+{
+	typedef ::LRESULT (W::* WndProc)(::HWND, ::UINT, ::WPARAM, ::LPARAM);
+	typedef CWndProcThunk ThisClass;
+	
+	struct SCode
+	{
+		BYTE m_mov;           // mov ECX, m_this
+		W * m_this;           //
+		BYTE m_jmp;           // jmp m_relproc
+		ptrdiff_t m_relproc;  // relative jmp
+	};
+	
+	SCode * Code;
+	
+public:
+	ThisClass(WndProc proc, W * obj)
+	{
+		Code = (SCode *)VirtualAlloc(NULL, sizeof(SCode), MEM_COMMIT, PAGE_EXECUTE_READWRITE);
+		Code->m_mov = 0xB9,
+		Code->m_this = obj,
+		Code->m_jmp = 0xE9,
+		Code->m_relproc = union_cast<char *>(proc) - reinterpret_cast<char *>(Code) - sizeof(*Code);
+		::FlushInstructionCache(::GetCurrentProcess(), Code, sizeof(*Code));
+	}
+	
+	virtual ~CWndProcThunk()
+	{
+		VirtualFree(Code, sizeof(*Code), MEM_RELEASE);
+		Code = NULL;
+	}
+
+	operator ::WNDPROC() const {return reinterpret_cast<::WNDPROC>(Code); }
+	operator ::LONG_PTR() const {return reinterpret_cast<::LONG_PTR>(Code); }
+} ;
+
+
+
+
+
+template <class W> class CDlgProcThunk
+{
+	typedef ::BOOL (W::* DlgProc)(::HWND, ::UINT, ::WPARAM, ::LPARAM);
+	typedef CDlgProcThunk ThisClass;
+	
+	struct SCode
+	{
+		BYTE m_mov;           // mov ECX, m_this
+		W * m_this;           //
+		BYTE m_jmp;           // jmp m_relproc
+		ptrdiff_t m_relproc;  // relative jmp
+	};
+	
+	SCode * Code;
+	
+public:
+	CDlgProcThunk(DlgProc proc, W * obj)
+	{
+		Code = (SCode *)VirtualAlloc(NULL, sizeof(SCode), MEM_COMMIT, PAGE_EXECUTE_READWRITE);
+		Code->m_mov = 0xB9,
+		Code->m_this = obj,
+		Code->m_jmp = 0xE9,
+		Code->m_relproc = union_cast<char *>(proc) - reinterpret_cast<char *>(Code) - sizeof(*Code);
+		::FlushInstructionCache(::GetCurrentProcess(), Code, sizeof(*Code));
+	}
+	
+	virtual ~CDlgProcThunk()
+	{
+		VirtualFree(Code, sizeof(*Code), MEM_RELEASE);
+		Code = NULL;
+	}
+
+	operator ::DLGPROC() const {return reinterpret_cast<::DLGPROC>(Code); }
+	operator ::LONG_PTR() const {return reinterpret_cast<::LONG_PTR>(Code); }
+} ;
+
+
+
+
+
+	#pragma pack(pop)
+
+#else  // _M_IX86
+	#error Only X86 supported
+#endif
+
+
+
+
+
+#endif  // WNDPROCTHUNK_H_INCLUDED
+
+
+
+