Add zstd support

[dprotti]

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• [ ] Bug
• [ ] Question
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Describe your issue:

QArchive is a wrapper around libarchive, a library which already supports zstandard compression algorithm. However QArchive does not include zstd among its QArchiveFormats. In our company we use zstd extensively so would be great to be able to use QArchive to handle this data format.

[antony-jr]

I've been working on this in the past days. The compression and extraction works but the memory based compression and extraction is not working well. I think there is some callbacks which I need to properly implement. (notably the archive_read_skip callback). Since some callbacks are crucial for different types of archives.

[dprotti]

Thank you very much for your work on this! I'll be happy once this work completes, and for sure many users of your library. Zstd is a great algorithm so would be very valuable to have it available on QArchive.

[moyamartin]

Hi Antony-jr, I am also interested in this issue. Are there any updates on this?

[antony-jr]

@moyamartin Yeah, almost complete. Only one test is failing in memory based extraction for zstd (I might be doing something wrong). Take a look at the progress in this new branch -> https://github.com/antony-jr/QArchive/tree/zstd

[moyamartin]

Thanks for implementing and closing this ticket. Do you plan to have a new release soon?

[antony-jr]

Yes. After a little bit of nitpicks.

[moyamartin]

Thanks @antony-jr let me know when you have a new release so I can update the dependency! Have a nice week

[antony-jr]

Thanks @antony-jr let me know when you have a new release so I can update the dependency! Have a nice week

@moyamartin The latest release now has zstd support.

[dprotti]

@antony-jr thank you very much for your work on this! We'll be integrating this new version soon to our systems and let you know how it goes.