feat: add hook helpers (#44)

CommonLibSF/include/SFSE/SFSE.h

@@ -8,4 +8,5 @@
 #include "SFSE/Interfaces.h"
 #include "SFSE/Logger.h"
 #include "SFSE/Trampoline.h"
+#include "SFSE/Utilities.h"
 #include "SFSE/Version.h"

CommonLibSF/include/SFSE/Utilities.h

@@ -0,0 +1,39 @@
+#pragma once
+
+#include "REL/Relocation.h"
+#include "SFSE/API.h"
+
+namespace SFSE
+{
+	namespace stl
+	{
+		template <class T, std::size_t Size = 5>
+		constexpr void write_thunk_call() noexcept
+		{
+			SFSE::AllocTrampoline(14);
+			auto& trampoline = SFSE::GetTrampoline();
+			T::func = trampoline.write_call<Size>(T::address, T::Thunk);
+		}
+
+		template <class To, class From>
+		constexpr void write_vfunc() noexcept
+		{
+			REL::Relocation<std::uintptr_t> vtbl{ To::VTABLE[0] };
+			From::func = vtbl.write_vfunc(From::idx, From::Thunk);
+		}
+
+		template <class To, class From>
+		constexpr void write_vfunc(const std::size_t a_vtable_idx) noexcept
+		{
+			REL::Relocation<std::uintptr_t> vtbl{ To::VTABLE[a_vtable_idx] };
+			From::func = vtbl.write_vfunc(From::idx, From::Thunk);
+		}
+
+		template <class T>
+		constexpr void write_vfunc(const REL::Offset a_offset) noexcept
+		{
+			REL::Relocation<std::uintptr_t> vtbl{ a_offset };
+			T::func = vtbl.write_vfunc(T::idx, T::Thunk);
+		}
+	} // namespace stl
+} // namespace SFSE