Reverse engineer 'CAppSystemGroup' class

Partially reverse engineered.

r5dev/public/appframework/IAppSystemGroup.cpp

@@ -12,16 +12,24 @@
 //-----------------------------------------------------------------------------
 // Purpose: Initialize plugin system
 //-----------------------------------------------------------------------------
-void CAppSystemGroup::Destroy(CAppSystemGroup* pModAppSystemGroup)
+void CAppSystemGroup::S_Destroy(CAppSystemGroup* pModAppSystemGroup)
 {
 	CAppSystemGroup_Destroy(pModAppSystemGroup);
 }
 
+//-----------------------------------------------------------------------------
+// Returns the stage at which the app system group ran into an error
+//-----------------------------------------------------------------------------
+CAppSystemGroup::AppSystemGroupStage_t CAppSystemGroup::GetCurrentStage() const
+{
+	return m_nCurrentStage;
+}
+
 void VAppSystemGroup::Attach(void) const
 {
-	DetourAttach(&CAppSystemGroup_Destroy, &CAppSystemGroup::Destroy);
+	DetourAttach(&CAppSystemGroup_Destroy, &CAppSystemGroup::S_Destroy);
 }
 void VAppSystemGroup::Detach(void) const
 {
-	DetourDetach(&CAppSystemGroup_Destroy, &CAppSystemGroup::Destroy);
+	DetourDetach(&CAppSystemGroup_Destroy, &CAppSystemGroup::S_Destroy);
 }

r5dev/public/appframework/IAppSystemGroup.h

@@ -1,13 +1,96 @@
 #ifndef APPSYSTEMGROUP_H
 #define APPSYSTEMGROUP_H
 
-class CAppSystemGroup
+#include "public/interface.h"
+#include "tier1/utlvector.h"
+#include "filesystem/filesystem.h"
+
+//-----------------------------------------------------------------------------
+// NOTE: The following methods must be implemented in your application
+// although they can be empty implementations if you like...
+//-----------------------------------------------------------------------------
+abstract_class IAppSystemGroup
 {
 public:
-	static void Destroy(CAppSystemGroup* pAppSystemGroup);
+	virtual ~IAppSystemGroup() {}
+
+	// An installed application creation function, you should tell the group
+	// the DLLs and the singleton interfaces you want to instantiate.
+	// Return false if there's any problems and the app will abort
+	virtual bool Create() = 0;
+
+	// Allow the application to do some work after AppSystems are connected but 
+	// they are all Initialized.
+	// Return false if there's any problems and the app will abort
+	virtual bool PreInit() = 0;
+
+	// Allow the application to do some work after AppSystems are initialized but 
+	// before main is run
+	// Return false if there's any problems and the app will abort
+	virtual bool PostInit() = 0;
+
+	// Main loop implemented by the application
+	virtual int Main() = 0;
+
+	// Allow the application to do some work after all AppSystems are shut down
+	virtual void PreShutdown() = 0;
+
+	// Allow the application to do some work after all AppSystems are shut down
+	virtual void PostShutdown() = 0;
+
+	// Call an installed application destroy function, occurring after all modules
+	// are unloaded
+	virtual void Destroy() = 0;
+};
+
+//-----------------------------------------------------------------------------
+// This class represents a group of app systems that all have the same lifetime
+// that need to be connected/initialized, etc. in a well-defined order
+//-----------------------------------------------------------------------------
+class CAppSystemGroup : public IAppSystemGroup
+{
+public:
+	// Used to determine where we exited out from the system
+	enum AppSystemGroupStage_t
+	{
+		CREATION = 0,
+		DEPENDENCIES,
+		CONNECTION,
+		PREINITIALIZATION,
+		INITIALIZATION,
+		POSTINITIALIZATION,
+		RUNNING,
+		PRESHUTDOWN,
+		SHUTDOWN,
+		POSTSHUTDOWN,
+		DISCONNECTION,
+		DESTRUCTION,
+
+		APPSYSTEM_GROUP_STAGE_COUNT,
+		NONE,	// This means no error
+	};
+
+	// Detour statics.
+	static void S_Destroy(CAppSystemGroup* pAppSystemGroup);
+
+	// Returns the stage at which the app system group ran into an error
+	AppSystemGroupStage_t GetCurrentStage() const;
+
+private:
+	struct Module_t
+	{
+		void /*CSysModule*/* m_pModule;
+		CreateInterfaceFn m_Factory;
+		char* m_pModuleName;
+	};
 
 protected:
-	char pad[0xA8];
+	CUtlVector<Module_t> m_Modules;
+	CUtlVector<IAppSystem*> m_Systems;
+	CUtlVector<CreateInterfaceFn> m_NonAppSystemFactories;
+	char m_Pad[56]; // <-- unknown
+	AppSystemGroupStage_t m_nCurrentStage;
+	CFileSystem_Stdio* m_pFileSystem;
 };
 
 inline CMemory p_CAppSystemGroup_Destroy;