GNU bug report logs - #74624
29.4.50; Gnus cannot parse some filenames(UTF8) in an attachment

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Konstantin <reich-cv <at> yandex.ru>
Subject: bug#74624: closed (Re: bug#74624: 29.4.50; Gnus cannot parse some
 filenames(UTF8) in an attachment)
Date: Sun, 01 Dec 2024 08:18:02 +0000

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Your bug report

#74624: 29.4.50; Gnus cannot parse some filenames(UTF8) in an attachment

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 74624 <at> debbugs.gnu.org.

-- 
74624: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=74624
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Konstantin <reich-cv <at> yandex.ru>
Cc: 74624-done <at> debbugs.gnu.org, visuweshm <at> gmail.com
Subject: Re: bug#74624: 29.4.50; Gnus cannot parse some filenames(UTF8) in
 an attachment
Date: Sun, 01 Dec 2024 10:17:33 +0200

> From: Konstantin <reich-cv <at> yandex.ru>
> Cc: Eli Zaretskii <eliz <at> gnu.org>,  74624 <at> debbugs.gnu.org
> Date: Sun, 01 Dec 2024 10:52:30 +0300
> 
> 
> Visuwesh <visuweshm <at> gmail.com> writes:
> 
> > The decoding of the filename in the Content-Disposition header is done
> > in mm-dissect-buffer by calling mail-header-parse-content-disposition.
> > Specifically, rfc2231-parse-string.  The following patch fixes the issue
> > on my end:
> >
> > diff --git a/lisp/mail/rfc2231.el b/lisp/mail/rfc2231.el
> > index 33324cafb5b..632e270a922 100644
> > --- a/lisp/mail/rfc2231.el
> > +++ b/lisp/mail/rfc2231.el
> > @@ -193,7 +193,7 @@ rfc2231-parse-string
> >  		     (push (list attribute value encoded) cparams))
> >  		    ;; Repetition of a part; do nothing.
> >  		    ((and elem
> > -			  (null number))
> > +			  (null part))
> >  		     )
> >  		    ;; Concatenate continuation parts.
> >  		    (t
> >
> > NUMBER is the variable used during the parsing portion of the function
> > in the big condition-case form above the cl-loop form which the patch
> > modifies.  In the header below
> >
> >     Content-Disposition: attachment;
> >       filename*0*=UTF-8''%D0%9E%D0%B1%D0%B7%D0%BE%D1%80%202024%20%28%D0%BD%D0;
> >       filename*1*=%B0%20.docx;
> >       size=10
> >
> > the function first parses filename*0* and here NUMBER is 0, then
> > filename*1* and here NUMBER is 1.  By the time it finishes parsing size,
> > NUMBER is set to nil.  The loop should use the value of NUMBER pushed to
> > PARAMETERS as the 3rd element (referred to as `part' by the cl-loop
> > form) instead of whatever value NUMBER happened to be when we parsed the
> > last element.
> 
> Thank you,
> 
> indeed the patch fixes this bug.

Thanks, installed on the emacs-30 branch, and closing the bug.

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From: Konstantin <reich-cv <at> yandex.ru>
To: bug-gnu-emacs <at> gnu.org
Subject: 29.4.50; Gnus cannot parse some filenames(UTF8) in an attachment
Date: Sat, 30 Nov 2024 18:59:25 +0300

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From time to time i get emails with attachments from my colleges, which they send from
"Roundcube" web-interface. 

Often, i cannot open these attachments by =RET=(gnus-article-press-button)
or save them =o=(gnus-mime-save-part) with correct name.
(interestingly =X-m=(gnus-summary-save-parts) works correctly)

The reason is gnus cannot parse correctly some attached filenames.

The example of such attachment (I took it from gnus-summary-show-raw-article)

 --=_d38c0abddd645077f401d42fa430d9d5
Content-Transfer-Encoding: base64
Content-Type: application/vnd.openxmlformats-officedocument.wordprocessingml.document;
 name="=?UTF-8?Q?=D0=9E=D0=B1=D0=B7=D0=BE=D1=80_2024_=28=D0=BD=D0=B0_=2Ed?=
 =?UTF-8?Q?ocx?="
Content-Disposition: attachment;
 filename*0*=UTF-8''%D0%9E%D0%B1%D0%B7%D0%BE%D1%80%202024%20%28%D0%BD%D0;
 filename*1*=%B0%20.docx;
 size=10

c2Rmc2FmYXNmCg==
--=_d38c0abddd645077f401d42fa430d9d5--

I have tried to examine the reason. As i see it,  
gnus-data for such attachment is formed incorrectly:

(#<buffer  *mm*-480444>
     ("application/vnd.openxmlformats-officedocument.word..."
     (name . "Обзор 2024 (на .docx"))
     base64 nil
     ("attachment" (size . "10")
     (filename . "Обзор 2024 (н\320")) nil nil nil)

One can see that the filename is broken.
It should be "Обзор 2024 (на .docx" just like the name.

I have attached the example of the mail(one can open it with nndoc)


Please, could you fix this bug.

[mail.test (application/octet-stream, attachment)]

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