#755 XZ compression support added

[kazimirm]

This is the proposed changes to resolve issue #755 to add support for xz compression with default compression level. Recognizing the need for enhanced compression options, these changes aim to provide better compression.

Key points of this merge request:

• Introduced xz compression support with the default compression level.
• Ensured backward compatibility to avoid breaking existing functionality.
• Added relevant tests to validate the new feature.

These changes were implemented conservatively to maintain stability, though there is potential for further refinement.

Please review the proposed changes. Feedback is welcome, and feel free to merge if everything looks good.

Thank you!

[alxdlv]

@ceki can you review the PR?

CC @kazimirm

[ceki]

Why is xz better than the existing zip or gz compressions?

[alxdlv]

@ceki XZ compression offers much higher compression ratio and efficiency than default compression of gz or zip

# ls -lAh
total 24M
-rw-r----- 1 user user 20M Oct  3 00:00 test.log
-rw-r--r-- 1 user user 3.6M Oct  3 00:00 archived.zip
-rw-r--r-- 1 user user 3.3M Oct  3 00:01 archived.gz
-rw-r----- 1 user user 626K Oct  3 00:03 archived.xz

Also XZ iz designed to handle large files more effectively than traditional GZIP/ZIP formats.

[psih0z]

Hi, @ceki do you have any plans to add this functionality? It is really needed.

[artyomlao]

@ceki
Hi! May I ask when .xz support can be completed?

[ceki]

The PR requires the xz library to be on the classpath. This not something that we can impose on the unsuspecting users.