#include <Windows.h>


typedef void(__cdecl* tUiShowList) (int a1, int a2, int a3, int a4);
DWORD OFFuiShowList = 0x644240;

tUiShowList UiShowList = NULL;




void Func()
{
	//do stuff here
}

void UI_ShowList(int a1, int a2, int a3, int a4)
{
	__asm PUSHAD;
	Func();
	__asm POPAD;
	UiShowList(a1, a2, a3, a4);
}







void MakeJMP(BYTE *pAddress, DWORD dwJumpTo, DWORD dwLen)
{
	DWORD dwOldProtect, dwBkup, dwRelAddr;

	VirtualProtect(pAddress, dwLen, PAGE_EXECUTE_READWRITE, &dwOldProtect);
	dwRelAddr = (DWORD)(dwJumpTo - (DWORD)pAddress) - 5;
	*pAddress = 0xE9;

	*((DWORD *)(pAddress + 0x1)) = dwRelAddr;
	for (DWORD x = 0x5; x < dwLen; x++) *(pAddress + x) = 0x90;
	VirtualProtect(pAddress, dwLen, dwOldProtect, &dwBkup);

	return;
}

void *DetourFunction(BYTE *src, const BYTE *dst, const int len)
{
	BYTE *jmp = (BYTE*)malloc(len + 5);
	DWORD dwBack;

	VirtualProtect(src, len, PAGE_EXECUTE_READWRITE, &dwBack);
	memcpy(jmp, src, len);
	jmp += len;
	jmp[0] = 0xE9;
	*(DWORD*)(jmp + 1) = (DWORD)(src + len - jmp) - 5;
	src[0] = 0xE9;
	*(DWORD*)(src + 1) = (DWORD)(dst - src) - 5;
	for (int i = 5; i<len; i++)
		src[i] = 0x90;
	VirtualProtect(src, len, dwBack, &dwBack);
	return (jmp - len);
}



BOOL WINAPI DllMain(HMODULE hMod, DWORD dwReason, LPVOID lpReserved)
{
	if (dwReason == DLL_PROCESS_ATTACH)
	{
		UiShowList = (tUiShowList)DetourFunction((PBYTE)OFFuiShowList, (PBYTE)&UI_ShowList, 5);
	}

	else if (dwReason == DLL_PROCESS_DETACH)
	{
		//do nothing here lol
	}

	return TRUE;
}