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Support legacy ZIP compression methods (for decompression at least)

From Rob Swindell@VERT to GitLab issue in main/sbbs on Tue May 6 17:20:22 2025

open https://gitlab.synchro.net/main/sbbs/-/issues/928

libarchive and zlib don't support legacy (pre-DEFLATED) ZIP compression methods. But it can be done:

https://www.hanshq.net/zip2.html
https://github.com/jsummers/oldunzip/

This would allow the extraction and viewing or subsequent download of archived files from legacy ZIP files.

Whether this is done as a patch to zlib or libarchive or something internal to sbbs, it seems totally doable.

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� Synchronet � Vertrauen � Home of Synchronet � [vert/cvs/bbs].synchro.net

From Nigel Reed@VERT to GitLab note in main/sbbs on Tue May 6 23:30:06 2025

https://gitlab.synchro.net/main/sbbs/-/issues/928#note_7201

It looks like the libarchive team would be willing to consider implementing implode/explode if someone were to submit it so maybe that's the place for it?

https://github.com/libarchive/libarchive/issues/2365

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� Synchronet � Vertrauen � Home of Synchronet � [vert/cvs/bbs].synchro.net

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