open archive per level

Hi,

i'm programming a graphical user interface for restoring Dar backups.

To list the archive content I'm using the dynamic archive content
listing option like described in chapter 7 of your API tutorial.
Thank you for that, it's working really well. 
But it seams like the "read" constructor reads the whole catalogue.
Is it possible to change that behavior in a way
that the catalogue gets read per level?
That would really boost the performance.

Kind regards
Tobias


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