Subj : WxCenter/SixelGallery/ImageMagick question
To   : Codefenix
From : Digital Man
Date : Tue May 06 2025 01:59 pm

 Re: WxCenter/SixelGallery/ImageMagick question
 By: Codefenix to Nightfox on Tue May 06 2025 08:18 am

> I find I get too many errors trying to extract anything from standard .ZIP
> files using the built-in archive functionality. Sometimes it works, but
> often it fails for some reason like "unsupported compression method" or
> something similar. I would normally assume it's how I'm how I'm trying to
> use it, but the usage seems straightforward and doesn't seem to leave a lot
> of room for error.

The built-in archive support in SBBS (exposed via the JS "Archive" class) uses libarchive (https://www.libarchive.org/) which uses zlib for ZIP file support.  zlib only supports the "deflate" compresson method. It does not support the ancient PKWARE "implode" compression method. So if you have very old ZIP files, yes, they can't be extracted using libarchive today.
https://github.com/libarchive/libarchive/issues/2365
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