Differential D3728 Diff 16678 ps/trunk/source/lib/file/vfs/vfs_populate.cpp

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ps/trunk/source/lib/file/vfs/vfs_populate.cpp

/* Copyright (C) 2020 Wildfire Games.		/* Copyright (C) 2021 Wildfire Games.
*		*
* Permission is hereby granted, free of charge, to any person obtaining		* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the		* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including		* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,		* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to		* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to		* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:		* the following conditions:
▲ Show 20 Lines • Show All 153 Lines • ▼ Show 20 Lines	Status vfs_Populate(VfsDirectory* directory)
RETURN_STATUS_IF_ERR(helper.AddEntries());		RETURN_STATUS_IF_ERR(helper.AddEntries());

return INFO::OK;		return INFO::OK;
}		}


Status vfs_Attach(VfsDirectory* directory, const PRealDirectory& realDirectory)		Status vfs_Attach(VfsDirectory* directory, const PRealDirectory& realDirectory)
{		{
		PRealDirectory existingRealDir = directory->AssociatedDirectory();

		// Don't allow replacing the real directory by a lower-priority one.
		if (!existingRealDir \|\| existingRealDir->Priority() < realDirectory->Priority())
		{
		// This ordering is peculiar but useful, as it "defers" the population call.
		// If there is already a real directory, we will replace it (and lose track of it),
		// so we'll populate it right away, but the 'new' real directory can wait until we access it.
RETURN_STATUS_IF_ERR(vfs_Populate(directory));		RETURN_STATUS_IF_ERR(vfs_Populate(directory));
directory->SetAssociatedDirectory(realDirectory);		directory->SetAssociatedDirectory(realDirectory);
return INFO::OK;		return INFO::OK;
}		}
		// We are attaching a lower-priority real directory.
		// Because of deferred population, we need to immediately populate this new directory.
		bool shouldPop = directory->ShouldPopulate();
		// This sets "should populate" to true, so the vfs_Populate call below immediately populates.
		directory->SetAssociatedDirectory(realDirectory);
		RETURN_STATUS_IF_ERR(vfs_Populate(directory));
		// Reset to the higher priority realDirectory, which resets ShouldPopulate to true.
		directory->SetAssociatedDirectory(existingRealDir);
		// Avoid un-necessary repopulation by clearing the flag.
		if (!shouldPop)
		directory->ShouldPopulate();

		return INFO::OK;
		}