Undo Obsidian's serialized I/O code (#26)

Main.cpp

@@ -45,6 +45,7 @@
 #include "FaceGenExporter.h"
 #include "ONAMFix.h"
 #include "SCOLConsistencyFix.h"
+#include "UnserializedIO.h"
 #include "Allocator/MemoryManager.hpp"
 #include "Allocator/BSMemory.hpp"
 
@@ -99,6 +100,8 @@ bool NVSEPlugin_Load(const NVSEInterface* nvse)
 
 	PrintReplacer::InitHooks();
 
+	UnserializedIO::InitHooks();
+
 	CreateLogFile();
 
 	_DMESSAGE("Geck Extender Base Address: %08X", GetModuleHandle("ZeGaryHax.dll"));

UnserializedIO.h

@@ -0,0 +1,37 @@
+#pragma once
+
+#include "SafeWrite.h"
+#include <xutil.h>
+
+namespace UnserializedIO 
+{
+	namespace ToReplace 
+	{
+		constexpr static UInt32 fseekAddr = 0x85207B;
+		constexpr static UInt32 freadAddr[] = { 0x851EE3, 0x85210F, 0x85212F };
+		constexpr static UInt32 fwriteAddr[] = { 0x851F2D, 0x8521E1 };
+	}
+
+	namespace FunctionsAddr 
+	{
+		constexpr static UInt32 fseek = 0xC63400;
+		constexpr static UInt32 fread = 0xC62A6D;
+		constexpr static UInt32 fwrite = 0xC62686;
+	}
+
+	// Undoes Obsidian's serialization of the I/O functions by replacing them with the original ones
+	// Technically we patched this in GECK.exe itself - this serves as a documentation
+	void InitHooks() 
+	{
+		// Remove the initializator for the serialized I/O functions
+		XUtil::PatchMemoryNop(0x8532CA, 5);
+
+		WriteRelCall(ToReplace::fseekAddr, FunctionsAddr::fseek);
+
+		for (UInt32 addr : ToReplace::freadAddr)
+			WriteRelCall(addr, FunctionsAddr::fread);
+
+		for (UInt32 addr : ToReplace::fwriteAddr)
+			WriteRelCall(addr, FunctionsAddr::fwrite);
+	}
+}

ZeGaryHax.vcxproj

@@ -313,6 +313,7 @@ copy "$(TargetDir)$(TargetName).pdb" "$(FalloutNVPath)\Data\NVSE\Plugins\$(Targe
       </SubType>
     </ClInclude>
     <ClInclude Include="UISpeedHooks.h" />
+    <ClInclude Include="UnserializedIO.h" />
     <ClInclude Include="xutil.h" />
     <ClInclude Include="DialogResizing.h" />
     <ClInclude Include="Main.h" />

ZeGaryHax.vcxproj.filters

@@ -201,6 +201,7 @@
       <Filter>libs</Filter>
     </ClInclude>
     <ClInclude Include="PrintReplacer.hpp" />
+    <ClInclude Include="UnserializedIO.h" />
     <ClInclude Include="Allocator\BSMemory.hpp">
       <Filter>allocator</Filter>
     </ClInclude>