GNU bug report logs - #1174
23.0.60; Some UTF-8 mails displaying wrongly in Emacs 23

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From: Reiner Steib <reinersteib+gmane <at> imap.cc>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: Simon Josefsson <simon <at> josefsson.org>,
        Frank Schmitt <ich <at> frank-schmitt.net>, James Cloos <cloos <at> jhcloos.com>,
        ding <at> gnus.org, 1174 <at> debbugs.gnu.org,
        Clemens Schueller <cs.usenet.nospam <at> aon.at>
Subject: bug#1174: 23.0.60; Some UTF-8 mails displaying wrongly in Emacs 23
Date: Sun, 30 Nov 2008 14:12:02 +0100

On Sat, Nov 29 2008, Stefan Monnier wrote:

>> Stefan, what are the "accidental emacs-mule-valid byte sequences"
>> that trigger this problem?  It would be good if someone could send
>> me a problematic article. [2]
>
> In Emacs-22, the problem was more difficult to trigger: you had to
> receive an email whose undecoded text contained emacs-mule escape
> sequences, which is rather uncommon.  With Emacs-23, it's a lot more
> common since the internal encoding has changed to a variant of utf-8:
> an 8bit body using utf-8 will see its content unwillingly decoded during
> nnimap-demule which leads to the bugs we've seen recently.

Could you send me an article demonstrating the problem?

> I'm pretty sure that string-as-multibyte is wrong here in general.
> Maybe the problem is that nnimap-demule is used blindly in different
> contexts where some need string-to-multibyte and some need
> string-as-multibyte.  E.g. maybe Simon's problem was linked to imap
> groups with non-ASCII chars in their names, rather than in the
> message bodies.

I'm not familiar with the IMAP code, but AFAICS, `nnimap-demule' is
only used when getting headers or body:

| nnimap.el:611:	      headers (nnimap-demule

(defun nnimap-retrieve-headers-progress ()
  "Hook to insert NOV line for current article into `nntp-server-buffer'."

| nnimap.el:951:	 (nnimap-demule

(defun nnimap-callback (article gnus-callback buffer)
  (when (eq article (imap-current-message))
    (remove-hook 'imap-fetch-data-hook
		 (nnimap-make-callback article gnus-callback buffer))
    (with-current-buffer buffer
      (insert
       (with-current-buffer nnimap-server-buffer
	 (nnimap-demule
	  (if (imap-capability 'IMAP4rev1)
	      ;; xxx don't just use car? alist doesn't contain
	      ;; anything else now, but it might...
	      (nth 2 (car (imap-message-get article 'BODYDETAIL)))
	    (imap-message-get article 'RFC822)))))
      (nnheader-ms-strip-cr)
      (funcall gnus-callback t))))

| nnimap.el:977:		(insert (nnimap-demule (if detail

(defun nnimap-request-article-part (article part prop &optional
					    group server to-buffer detail)

Bye, Reiner.
-- 
       ,,,
      (o o)
---ooO-(_)-Ooo---  |  PGP key available  |  http://rsteib.home.pages.de/

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