bug#65299: 29.1; ZIP archived WEBP images can not be displayed correctly

bug#65299: 29.1; ZIP archived WEBP images can not be displayed correctly

[awrhygty]

Opening a entry for a WEBP image in a ZIP archive,
the subfile buffer is multibyte and the image is not displayed or
displayed collapsed.


In GNU Emacs 29.1 (build 2, x86_64-w64-mingw32) of 2023-08-02 built on
 AVALON
Windowing system distributor 'Microsoft Corp.', version 10.0.19045
System Description: Microsoft Windows 10 Pro (v10.0.2009.19045.3324)

Configured using:
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bug#65299: 29.1; ZIP archived WEBP images can not be displayed correctly

[Eli Zaretskii]

> From: awrhygty@outlook.com
> Date: Tue, 15 Aug 2023 13:02:43 +0900
> 
> 
> Opening a entry for a WEBP image in a ZIP archive,
> the subfile buffer is multibyte and the image is not displayed or
> displayed collapsed.

You need to say

  C-x RET c no-conversion RET RET

to open such files from a zip archive.

Determining the right coding system when opening files from ZIP
archives is a tricky issue, and frequently needs forcing a certain
encoding manually.  I don't know how to do better in general, what
with all the possible sources of the files and their encodings.  A Zip
archive can include files from Unix systems or from Windows, and we
unzip by running the 'unzip' program.  So the usual defaults for
guessing the encoding don't really work.

bug#65299: 29.1; ZIP archived WEBP images can not be displayed correctly

[awrhygty]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: awrhygty@outlook.com
>> Date: Tue, 15 Aug 2023 13:02:43 +0900
>> 
>> 
>> Opening a entry for a WEBP image in a ZIP archive,
>> the subfile buffer is multibyte and the image is not displayed or
>> displayed collapsed.
>
> You need to say
>
>   C-x RET c no-conversion RET RET
>
> to open such files from a zip archive.
>
> Determining the right coding system when opening files from ZIP
> archives is a tricky issue, and frequently needs forcing a certain
> encoding manually.  I don't know how to do better in general, what
> with all the possible sources of the files and their encodings.  A Zip
> archive can include files from Unix systems or from Windows, and we
> unzip by running the 'unzip' program.  So the usual defaults for
> guessing the encoding don't really work.

At least modifying 'auto-coding-alist takes effect.

bug#65299: 29.1; ZIP archived WEBP images can not be displayed correctly

[Eli Zaretskii]

> From: awrhygty@outlook.com
> Cc: 65299@debbugs.gnu.org
> Date: Tue, 15 Aug 2023 22:05:36 +0900
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > You need to say
> >
> >   C-x RET c no-conversion RET RET
> >
> > to open such files from a zip archive.
> >
> > Determining the right coding system when opening files from ZIP
> > archives is a tricky issue, and frequently needs forcing a certain
> > encoding manually.  I don't know how to do better in general, what
> > with all the possible sources of the files and their encodings.  A Zip
> > archive can include files from Unix systems or from Windows, and we
> > unzip by running the 'unzip' program.  So the usual defaults for
> > guessing the encoding don't really work.
> 
> At least modifying 'auto-coding-alist takes effect.

OK, but that cannot be done by default, since the right encoding is
not known in advance.

bug#65299: 29.1; ZIP archived WEBP images can not be displayed correctly

[Stefan Kangas]

Eli Zaretskii <eliz@gnu.org> writes:

> > From: awrhygty@outlook.com
> > Cc: 65299@debbugs.gnu.org
> > Date: Tue, 15 Aug 2023 22:05:36 +0900
> >
> > Eli Zaretskii <eliz@gnu.org> writes:
> >
> > > You need to say
> > >
> > >   C-x RET c no-conversion RET RET
> > >
> > > to open such files from a zip archive.
> > >
> > > Determining the right coding system when opening files from ZIP
> > > archives is a tricky issue, and frequently needs forcing a certain
> > > encoding manually.  I don't know how to do better in general, what
> > > with all the possible sources of the files and their encodings.  A Zip
> > > archive can include files from Unix systems or from Windows, and we
> > > unzip by running the 'unzip' program.  So the usual defaults for
> > > guessing the encoding don't really work.
> >
> > At least modifying 'auto-coding-alist takes effect.
>
> OK, but that cannot be done by default, since the right encoding is
> not known in advance.

So is this a wontfix, then?

bug#65299: 29.1; ZIP archived WEBP images can not be displayed correctly

[Eli Zaretskii]

> From: Stefan Kangas <stefankangas@gmail.com>
> Date: Fri, 1 Sep 2023 22:24:40 +0200
> Cc: awrhygty@outlook.com, 65299@debbugs.gnu.org
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > > From: awrhygty@outlook.com
> > > Cc: 65299@debbugs.gnu.org
> > > Date: Tue, 15 Aug 2023 22:05:36 +0900
> > >
> > > Eli Zaretskii <eliz@gnu.org> writes:
> > >
> > > > You need to say
> > > >
> > > >   C-x RET c no-conversion RET RET
> > > >
> > > > to open such files from a zip archive.
> > > >
> > > > Determining the right coding system when opening files from ZIP
> > > > archives is a tricky issue, and frequently needs forcing a certain
> > > > encoding manually.  I don't know how to do better in general, what
> > > > with all the possible sources of the files and their encodings.  A Zip
> > > > archive can include files from Unix systems or from Windows, and we
> > > > unzip by running the 'unzip' program.  So the usual defaults for
> > > > guessing the encoding don't really work.
> > >
> > > At least modifying 'auto-coding-alist takes effect.
> >
> > OK, but that cannot be done by default, since the right encoding is
> > not known in advance.
> 
> So is this a wontfix, then?

I guess so, yes.

bug#65299: 29.1; ZIP archived WEBP images can not be displayed correctly

[Stefan Kangas]

tags 65299 wontfix
close 65299
thanks

Eli Zaretskii <eliz@gnu.org> writes:

>> So is this a wontfix, then?
>
> I guess so, yes.

Thanks, closed as wontfix.