[fpc-pascal] Don't understand Zipper.DoEndOfFile/UnZipper.DoEndOfFile

[Reinier Olislagers]

I've been working on documenting the Zipper/Unzipper classes:
packages\paszlib\src\zipper.pp
Now looking at the protected procedure TZipper/TUnzipper.DoEndOfFile

They apparently update compression percentage statistics and call a user
defined callback (if any, defined in OnEndOfFile)

I don't understand though by whom/if they are called? A grep through the
source code showed nothing referencing it.

Thanks,
Reinier