GNU bug report logs - #52477
27.1; .crx and .crx3 are zip files

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Michael Albinus <michael.albinus <at> gmx.de>
Cc: trentbuck <at> gmail.com, 52477 <at> debbugs.gnu.org, stefan <at> marxist.se
Subject: bug#52477: 27.1; .crx and .crx3 are zip files
Date: Thu, 16 Dec 2021 11:22:08 +0200

> From: Michael Albinus <michael.albinus <at> gmx.de>
> Date: Thu, 16 Dec 2021 09:56:57 +0100
> Cc: "Trent W. Buck" <trentbuck <at> gmail.com>, 52477 <at> debbugs.gnu.org
> 
> > The first couple of bytes of that files is "Cr24", while a normal zip
> > file starts with "PK".
> 
> Yes, and that's why libarchive(3) doesn't handle it. Sadly, I cannot add
> it to tramp-archive.el, therefore.
> 
> But there's no reason to prevent it from adding to arc-mode.el and/or
> dired-aux.el.

If the file doesn't follow the PKZip spec in the initial signature,
who knows what else in that spec doesn't it follow?  The ZIP spec has
a lot of special rules and formatting requirements, so if a file
doesn't follow them, how can we support it without knowing its exact
format specification?

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