Plugin System (#1590)

---------

Co-authored-by: Mihai Fufezan <fufexan@protonmail.com>

src/plugins/HookSystem.hpp

@@ -0,0 +1,48 @@
+#pragma once
+
+#include <string>
+#include <vector>
+#include <memory>
+
+#define HANDLE void*
+
+class CFunctionHook {
+  public:
+    CFunctionHook(HANDLE owner, void* source, void* destination);
+    ~CFunctionHook();
+
+    bool hook();
+    bool unhook();
+
+    CFunctionHook(const CFunctionHook&) = delete;
+    CFunctionHook(CFunctionHook&&)      = delete;
+    CFunctionHook& operator=(const CFunctionHook&) = delete;
+    CFunctionHook& operator=(CFunctionHook&&) = delete;
+
+    void*          m_pOriginal = nullptr;
+
+  private:
+    void*  m_pSource         = nullptr;
+    void*  m_pFunctionAddr   = nullptr;
+    void*  m_pTrampolineAddr = nullptr;
+    void*  m_pDestination    = nullptr;
+    size_t m_iHookLen        = 0;
+    size_t m_iTrampoLen      = 0;
+    HANDLE m_pOwner          = nullptr;
+    bool   m_bActive         = false;
+
+    friend class CHookSystem;
+};
+
+class CHookSystem {
+  public:
+    CFunctionHook* initHook(HANDLE handle, void* source, void* destination);
+    bool           removeHook(CFunctionHook* hook);
+
+    void           removeAllHooksFrom(HANDLE handle);
+
+  private:
+    std::vector<std::unique_ptr<CFunctionHook>> m_vHooks;
+};
+
+inline std::unique_ptr<CHookSystem> g_pFunctionHookSystem;