tar archive encodes file-names wrongly

[individual-it]

Describe the bug

file-names with non-latin characters are not displayed correctly with some tar tools

Steps to reproduce

Steps to reproduce the behavior:

1. create a folder
2. upload a file into the folder that contains non-latin in the file-name
3. download the complete folder using the archiver endpoint. Make sure Windows NT is not send in the User-Agent header. So on Windows the user-agent need to be faked or use curl
4. this should give a .tar file as download, if you are given a .zip file the user-agent header contains the string Windows NT
5. inspect the tar archive on Windows or unpack the archive using php:

   <?php
   $archive = new PharData('file.tar');
   $archive->extractTo('/tmp/test');
   

Expected behavior

file-names should contain all non-latin characters

Actual behavior

This works fine with Linux tar command, but not with any Windows tool I tried or PHP
Instead I get all non-latin characters removed from the file-names and an additional folder called PaxHeaders.0, this folder contains text files, where the content is the correct name of the actual file

PaxHeaders.0: 27 path=my_data/öäü.txt

Additional context

This is ether a problem in how the tar files are constructed in ocis or some widely used library for clients has an issue

[kulmann]

I think this belongs into the cs3org/reva repo where the archiver is implemented.

[individual-it]

moved to cs3org/reva#2255