99 lines
2.6 KiB
C++
99 lines
2.6 KiB
C++
#pragma once
|
|
|
|
#include <variant>
|
|
#include <functional>
|
|
#include <type_traits>
|
|
|
|
// Virtual Function Information
|
|
template <typename T>
|
|
class __Function;
|
|
template <typename T>
|
|
class __VirtualFunctionInfo {
|
|
__VirtualFunctionInfo(T *addr_, void *parent_);
|
|
[[nodiscard]] bool can_overwrite() const;
|
|
T *const addr;
|
|
void *const parent;
|
|
friend class __Function<std::remove_pointer_t<T>>;
|
|
};
|
|
|
|
// Thunks
|
|
typedef void *(*thunk_enabler_t)(void *target, void *thunk);
|
|
void enable_all_thunks(const thunk_enabler_t &thunk_enabler);
|
|
|
|
// Function Information
|
|
template <typename Ret, typename... Args>
|
|
class __Function<Ret(Args...)> {
|
|
public:
|
|
// Types
|
|
using ptr_type = Ret (*)(Args...);
|
|
using type = std::function<Ret(Args...)>;
|
|
using overwrite_type = std::function<Ret(type, Args...)>;
|
|
|
|
// Normal Function
|
|
__Function(const char *name_, ptr_type func_, ptr_type thunk_);
|
|
// Virtual Function
|
|
__Function(const char *name_, ptr_type *func_, void *parent, ptr_type thunk_);
|
|
|
|
// Overwrite Function
|
|
[[nodiscard]] bool overwrite(overwrite_type target) {
|
|
// Check If Enabled
|
|
if (!enabled) {
|
|
return false;
|
|
}
|
|
// Overwrite
|
|
type original = get_thunk_target();
|
|
thunk_target = [original, target](Args... args) {
|
|
return target(original, args...);
|
|
};
|
|
return true;
|
|
}
|
|
|
|
// Getters
|
|
[[nodiscard]] ptr_type get_backup() const {
|
|
return backup;
|
|
}
|
|
[[nodiscard]] ptr_type get() const {
|
|
if (!enabled) {
|
|
return nullptr;
|
|
} else if (is_virtual) {
|
|
return *get_vtable_addr();
|
|
} else {
|
|
return std::get<ptr_type>(func);
|
|
}
|
|
}
|
|
[[nodiscard]] ptr_type *get_vtable_addr() const {
|
|
if (is_virtual) {
|
|
return std::get<__VirtualFunctionInfo<ptr_type>>(func).addr;
|
|
} else {
|
|
return nullptr;
|
|
}
|
|
}
|
|
[[nodiscard]] const char *get_name() const {
|
|
return name;
|
|
}
|
|
[[nodiscard]] type get_thunk_target() const {
|
|
if (thunk_target) {
|
|
return thunk_target;
|
|
} else {
|
|
return get_backup();
|
|
}
|
|
}
|
|
|
|
private:
|
|
// Current Function
|
|
const bool is_virtual;
|
|
std::variant<ptr_type, __VirtualFunctionInfo<ptr_type>> func;
|
|
|
|
// State
|
|
const bool enabled;
|
|
const char *const name;
|
|
|
|
// Backup Of Original Function Pointer
|
|
const ptr_type backup;
|
|
|
|
// Thunk
|
|
const ptr_type thunk;
|
|
type thunk_target;
|
|
void enable_thunk(const thunk_enabler_t &thunk_enabler);
|
|
friend void enable_all_thunks(const thunk_enabler_t &);
|
|
}; |