L2SP::L2SP()
{
	dwProcessID = GetCurrentProcessId();
	L2Server = OpenProcess(PROCESS_ALL_ACCESS | PROCESS_VM_READ | PROCESS_VM_WRITE, false, dwProcessID);

	if (!L2Server)
	{
		MessageBox(NULL, "Unable to open L2Server's Process! Please restart the server.", "Error", MB_OK);
		ExitProcess(1);
	}
}

L2SP *L2SP::Instance()
{
	static L2SP Ex;

	return &Ex;
}

void L2SP::WriteMemory(DWORD *pAddress, LPCVOID pData, BYTE length)
{
	if(!L2Server)
	{
		dwProcessID = GetCurrentProcessId();
		L2Server = OpenProcess(PROCESS_ALL_ACCESS | PROCESS_VM_READ | PROCESS_VM_WRITE, false, dwProcessID);
		if (!L2Server)
		{
			MessageBox(NULL, "Unable to open L2Server's Process! Please restart the server.", "Error", MB_OK);	
			ExitProcess(1);
		}
	}

	

	DWORD dwOldProtect = NULL;
	SIZE_T bWritten = NULL;
	if (!VirtualProtect((LPVOID)(pAddress), length, PAGE_EXECUTE_READWRITE, &dwOldProtect))
	{
		//error
	}

	if (!WriteProcessMemory(L2Server, (LPVOID)(pAddress), (LPCVOID)pData, length, &bWritten))
	{
		//error
		return;
	}

	if (!VirtualProtect((LPVOID)(pAddress), length, dwOldProtect, &dwOldProtect))
	{
		//error
	}
}

void L2SP::WriteHook(BYTE opcode, BYTE *pAddress, DWORD *pFunction, BYTE bNops)
{
	WriteMemory((DWORD *)(pAddress), (LPCVOID)&opcode, 1);
	DWORD pFuncAddress = (DWORD)pFunction - (DWORD)(pAddress+5);
	WriteMemory((DWORD *)(pAddress + 1), (LPCVOID)(&pFuncAddress), sizeof(pFuncAddress));
	while (bNops != 0)
	{
		int i = 6;
		WriteMemory((DWORD *)(pAddress + i), (LPCVOID)&NOP, 1);
		++i;
		--bNops;
	}
}

static const BYTE CALL = 0xE8;
L2SP::Instance()->WriteHook(CALL, (BYTE*)ADR_LOADDATA_HOOK, (DWORD*)Hooks::LoadDataHook, 0);