AC_Internal-/hook.cpp at main · robwert77/AC_Internal- · GitHub

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#include "mem.h"
#include "hook.h"


uintptr_t FindDMAAddy(uintptr_t ptr, std::vector<unsigned int> offsets)
{
	uintptr_t addr = ptr;
	for (unsigned int i = 0; i < offsets.size(); ++i)
	{
		addr = *(uintptr_t*)addr;
		addr += offsets[i];
	}
	return addr;
}


bool Detour32(BYTE* src, BYTE* dst, const uintptr_t len)
{
	if (len < 5) return false;

	DWORD curProtection;
	VirtualProtect(src, len, PAGE_EXECUTE_READWRITE, &curProtection);

	uintptr_t relativeAdress = dst - src - 5;

	*src = 0xE9;

	*(uintptr_t*)(src + 1) = relativeAdress;

	VirtualProtect(src, len, curProtection, &curProtection);
	return true;
}
BYTE* TrampHook32(BYTE* src, BYTE* dst, const uintptr_t len)
{
	if (len < 5) return 0;

	BYTE* gateway = (BYTE*)VirtualAlloc(0, len, MEM_COMMIT | MEM_RESERVE, PAGE_EXECUTE_READWRITE);

	memcpy_s(gateway, len, src, len);

		uintptr_t gatewayRealtiveAddr = src - gateway - 5;

	*(gateway + len) = 0xE9;

	*(uintptr_t*)((uintptr_t)gateway + len + 1) = gatewayRealtiveAddr;

	Detour32(src, dst, len);


	return gateway;
}

Hook::Hook(BYTE* src, BYTE* dst, BYTE* PtrToGatewayFnPtr, uintptr_t len)
{
	this->src = src;
	this->dst = dst;
	this->len = len;
	this->PtrToGatewayFnPtr = PtrToGatewayFnPtr;

}
Hook::Hook(const char* exportName, const char* modName, BYTE* dst, BYTE* PtrToGatewayFnPtr, uintptr_t len)
{
	HMODULE hMod = GetModuleHandleA(modName);

	this->src = (BYTE*)GetProcAddress(hMod, exportName);

	this->dst = dst;
	this->len = len;
	this->PtrToGatewayFnPtr = PtrToGatewayFnPtr;
}

void Hook::Enable()
{
	memcpy(originalBytes, src, len);
	*(uintptr_t*)PtrToGatewayFnPtr = (uintptr_t)TrampHook32(src, dst, len);
	bStatus = true;
}
void Hook::Disable()
{
	mem::Patch(src, originalBytes, len);
	bStatus = false;
}
void Hook::Toggle()
{
	if (!bStatus) Enable();
	else Disable();
}