Zip file don't manage encrypted files

Problem/Motivation

Hi,

For my own needs, I've created a patch to change the way that this module add files to the final zip.
With encrypted files for example, we need to "call" them with their uri (not realpath on the server) and next manipulate them.

The idea here is to get file from their uri (so with their original stream) and copy them the temporary file system.
Next, we add these temporary files to the zip, close the zip and delete temporary directory that contain the files.

I'm not sure that is the best way to do that but it works.

Proposed resolution

Patch uploaded