[Feature Request]: zstd compression

[RScherzer]

Feature description

Hi,

not really a request but I wonder how I can specify (if possible) zstd compression method when creating a new archive or adding a file to an existing one. Opening, reading, extracting etc a zipfile with zstd compressed files works already fine (at least why quick tests show) but when I add a new file to such an archive, it automatically adds it as deflate. There is not zstd enum in BitCompressionMethod, so I wonder if this was simply forgotten or not supported at all.

Additional context

No response

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[rikyoz]

Hi!
As far as I know, and please correct me if I'm wrong, 7-Zip does not currently support creating archives using the zstd compression method.
It has recently added support for reading/extracting archives using the zstd compression method, and even .zst archives. And I'm going to add support for the .zst archive format, possibly in the next v4.0.10, since I've had the patch ready for quite some time and forgot to push it.
But to create such archives, or to use the zstd compression method in other archive formats like 7z or zip, we'll have to wait for 7-Zip to add support.

[RScherzer]

Oh yes, you're right. I guess I was confused by the fact that zstd is also some years old now and most likely I read about 7z forks who add the support. Let's cross fingers that it gets officially supported soon.