d2tweaks-rnd2k/vendor/D2Template/D2Template.cpp

#define _D2VARS_H

#include "D2Template.h"
#include "D2TemplatePatch.h"

extern DWORD DLLBASE_BNCLIENT = 0;
extern DWORD DLLBASE_D2CLIENT = 0;
extern DWORD DLLBASE_D2CMP = 0;
extern DWORD DLLBASE_D2COMMON = 0;
extern DWORD DLLBASE_D2DDRAW = 0;
extern DWORD DLLBASE_D2DIRECT3D = 0;
extern DWORD DLLBASE_D2GAME = 0;
extern DWORD DLLBASE_D2GDI = 0;
extern DWORD DLLBASE_D2GFX = 0;
extern DWORD DLLBASE_D2GLIDE = 0;
extern DWORD DLLBASE_D2LANG = 0;
extern DWORD DLLBASE_D2LAUNCH = 0;
extern DWORD DLLBASE_D2MCPCLIENT = 0;
extern DWORD DLLBASE_D2MULTI = 0;
extern DWORD DLLBASE_D2NET = 0;
extern DWORD DLLBASE_D2SOUND = 0;
extern DWORD DLLBASE_D2WIN = 0;
extern DWORD DLLBASE_FOG = 0;
extern DWORD DLLBASE_STORM = 0;
extern DWORD DLLBASE_IJL11 = 0;
extern DWORD DLLBASE_BINKW32 = 0;
extern DWORD DLLBASE_SMACKW32 = 0;
extern DWORD DLLBASE_UTILITY = 0;
extern DWORD DLLBASE_PLUGY = 0;
extern DWORD DLLBASE_D2EXPRES = 0;
extern DWORD DLLBASE_SGD2FREERES = 0;

void __fastcall D2TEMPLATE_FatalError(char* szMessage)
{
	MessageBoxA(NULL, szMessage, "", MB_OK | MB_ICONERROR);
	TerminateProcess(GetCurrentProcess(), -1);
}

BOOL __fastcall D2TEMPLATE_ApplyPatch(const DLLPatchStrc* hPatch)
{
	void* hGame = GetCurrentProcess();

	while (hPatch->nDLL != D2DLL_INVALID)
	{
		int nReturn = 0;
		int nDLL = hPatch->nDLL;
		if (nDLL < 0 || nDLL >= D2DLL_INVALID) return FALSE;

		DWORD dwAddress = hPatch->dwAddress;
		if (!dwAddress) return FALSE;

		DWORD dwBaseAddress = gptDllFiles[nDLL].dwAddress;
		if (!dwBaseAddress) return FALSE;

		dwAddress += dwBaseAddress;

		DWORD dwData = hPatch->dwData;
		if (hPatch->bRelative)
		{
			dwData = dwData - (dwAddress + sizeof(dwData));
		}

		void* hAddress = (void*)dwAddress;
		DWORD dwOldPage;

		if (hPatch->nPatchSize > 0)
		{
			BYTE Buffer[1024] = { 0 };

			for (size_t i = 0; i < hPatch->nPatchSize; i++)
				Buffer[i] = (BYTE)dwData;

			VirtualProtect(hAddress, hPatch->nPatchSize, PAGE_EXECUTE_READWRITE, &dwOldPage);
			nReturn = WriteProcessMemory(hGame, hAddress, &Buffer, hPatch->nPatchSize, 0);
			VirtualProtect(hAddress, hPatch->nPatchSize, dwOldPage, 0);
		}

		else
		{
			VirtualProtect(hAddress, sizeof(dwData), PAGE_EXECUTE_READWRITE, &dwOldPage);
			nReturn = WriteProcessMemory(hGame, hAddress, &dwData, sizeof(dwData), 0);
			VirtualProtect(hAddress, sizeof(dwData), dwOldPage, 0);
		}

		if (nReturn == 0) return FALSE;

		hPatch++;
	}

	return TRUE;
}

BOOL __fastcall D2TEMPLATE_LoadModules()
{
	for (int i = 0; i < D2DLL_INVALID; i++)
	{
		DLLBaseStrc* hDllFile = &gptDllFiles[i];

		void* hModule = GetModuleHandleA(hDllFile->szName);

		//if (!hModule)
		//{
		//	hModule = LoadLibraryA(hDllFile->szName);
		//}

		hDllFile->dwAddress = (DWORD)hModule;
	}

	DLLBASE_BNCLIENT = (DWORD)GetModuleHandleA("Bnclient.dll");
	DLLBASE_D2CLIENT = (DWORD)GetModuleHandleA("D2Client.dll");
	DLLBASE_D2CMP = (DWORD)GetModuleHandleA("D2CMP.dll");
	DLLBASE_D2COMMON = (DWORD)GetModuleHandleA("D2Common.dll");
	DLLBASE_D2DDRAW = (DWORD)GetModuleHandleA("D2DDraw.dll");
	DLLBASE_D2DIRECT3D = (DWORD)GetModuleHandleA("D2Direct3D.dll");
	DLLBASE_D2GAME = (DWORD)GetModuleHandleA("D2Game.dll");
	DLLBASE_D2GDI = (DWORD)GetModuleHandleA("D2Gdi.dll");
	DLLBASE_D2GFX = (DWORD)GetModuleHandleA("D2Gfx.dll");
	DLLBASE_D2GLIDE = (DWORD)GetModuleHandleA("D2Glide.dll");
	DLLBASE_D2LANG = (DWORD)GetModuleHandleA("D2Lang.dll");
	DLLBASE_D2LAUNCH = (DWORD)GetModuleHandleA("D2Launch.dll");
	DLLBASE_D2MCPCLIENT = (DWORD)GetModuleHandleA("D2MCPClient.dll");
	DLLBASE_D2MULTI = (DWORD)GetModuleHandleA("D2Multi.dll");
	DLLBASE_D2NET = (DWORD)GetModuleHandleA("D2Net.dll");
	DLLBASE_D2SOUND = (DWORD)GetModuleHandleA("D2Sound.dll");
	DLLBASE_D2WIN = (DWORD)GetModuleHandleA("D2Win.dll");
	DLLBASE_FOG = (DWORD)GetModuleHandleA("Fog.dll");
	DLLBASE_STORM = (DWORD)GetModuleHandleA("Storm.dll");
	DLLBASE_IJL11 = (DWORD)GetModuleHandleA("ijl11.dll");
	DLLBASE_BINKW32 = (DWORD)GetModuleHandleA("binkw32.dll");
	DLLBASE_SMACKW32 = (DWORD)GetModuleHandleA("SmackW32.dll");
	DLLBASE_UTILITY = (DWORD)GetModuleHandleA("Utility.dll");
	DLLBASE_PLUGY = (DWORD)GetModuleHandleA("Plugy.dll");
	DLLBASE_D2EXPRES = (DWORD)GetModuleHandleA("d2expres.dll");
	DLLBASE_SGD2FREERES = (DWORD)GetModuleHandleA("SGD2FreeRes.dll");

	return TRUE;
}

int __fastcall D2TEMPLATE_GetDebugPrivilege()
{
	void* hToken;
	LUID luid;
	TOKEN_PRIVILEGES tokenPrivileges;

	if (OpenProcessToken(GetCurrentProcess(), TOKEN_ALL_ACCESS, &hToken) == 0)
	{
		D2TEMPLATE_FatalError("OpenProcessToken Failed");
		return 0;
	}

	if (LookupPrivilegeValue(0, SE_DEBUG_NAME, &luid) == 0)
	{
		D2TEMPLATE_FatalError("LookupPrivilegeValue Failed");
		CloseHandle(hToken);
		return 0;
	}

	tokenPrivileges.PrivilegeCount = 1;
	tokenPrivileges.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
	tokenPrivileges.Privileges[0].Luid = luid;
	if (AdjustTokenPrivileges(hToken, 0, &tokenPrivileges, sizeof(tokenPrivileges), 0, 0) == 0)
	{
		D2TEMPLATE_FatalError("AdjustTokenPrivileges Failed");
		CloseHandle(hToken);
		return 0;
	}

	CloseHandle(hToken);
	return 1;
}

DWORD __fastcall GetDllOffset(char* ModuleName, DWORD BaseAddress, int Offset)
{
	if (!BaseAddress)
		BaseAddress = (DWORD)LoadLibraryA(GetModuleExt(ModuleName));

	if (Offset < 0)
		return (DWORD)GetProcAddress((HMODULE)BaseAddress, (LPCSTR)(-Offset));

	return BaseAddress + Offset;
}

char* __fastcall GetModuleExt(char* ModuleName)
{
	char DLLExt[] = ".dll";
	char DLLName[32] = { 0 };
	strcpy(DLLName, ModuleName);
	return strcat(DLLName, DLLExt);
}

int __fastcall D2TEMPLATE_Init()
{
	//D2TEMPLATE_GetDebugPrivilege();

	if (!D2TEMPLATE_LoadModules())
	{
		D2TEMPLATE_FatalError("Failed to load modules");
		return 0;
	}

	return 1;
}