66 lines
1.8 KiB
C
66 lines
1.8 KiB
C
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#pragma once
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#include <cstdint>
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#include <cstddef>
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#include <cstring>
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#include <memory>
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class VMTHook {
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private:
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std::uintptr_t** baseclass = nullptr;
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std::unique_ptr<std::uintptr_t[]> current_vft = nullptr;
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std::uintptr_t* original_vft = nullptr;
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std::size_t total_functions = 0;
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public:
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VMTHook(void) = default;
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VMTHook(void* baseclass) {
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this->baseclass = static_cast<std::uintptr_t**>(baseclass);
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while (static_cast<std::uintptr_t*>(*this->baseclass)[this->total_functions])
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++this->total_functions;
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const std::size_t table_size = this->total_functions * sizeof(std::uintptr_t);
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this->original_vft = *this->baseclass;
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this->current_vft = std::make_unique<std::uintptr_t[]>(this->total_functions);
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std::memcpy(this->current_vft.get(), this->original_vft, table_size);
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*this->baseclass = this->current_vft.get();
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};
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~VMTHook() {
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*this->baseclass = this->original_vft;
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};
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inline void* GetOriginalFunction(std::size_t function_index) {
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return reinterpret_cast<void*>(this->original_vft[function_index]);
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}
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template <typename Function> inline const Function GetOriginalFunction(std::size_t function_index) {
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return reinterpret_cast<Function>(this->original_vft[function_index]);
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}
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inline bool HookFunction(void* new_function, const std::size_t function_index) {
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if (function_index > this->total_functions)
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return false;
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this->current_vft[function_index] = reinterpret_cast<std::uintptr_t>(new_function);
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return true;
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}
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inline bool UnhookFunction(const std::size_t function_index) {
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if (function_index > this->total_functions)
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return false;
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this->current_vft[function_index] = this->original_vft[function_index];
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return true;
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}
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inline std::size_t GetTotalFunctions() {
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return this->total_functions;
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}
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};
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