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bug#44307: 27.1; UTF-8 parts transferred as 8bit in multipart messages f
From: |
Alexandre Duret-Lutz |
Subject: |
bug#44307: 27.1; UTF-8 parts transferred as 8bit in multipart messages fail to decode |
Date: |
Tue, 05 Jan 2021 11:00:58 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/27.1 (gnu/linux) |
Alexandre Duret-Lutz <adl@lrde.epita.fr> writes:
> In my case the (mm-handle-buffer handle) is multibyte. This
> multibyteness was preserved by mm-copy-to-buffer while creating the
> handle buffer, but a did not check the original source of it, since the
> comment above the macro suggests that having multibyte parts is OK.
I think I understand why the bug cannot be reproduced using nndoc in
emacs 28. The following patch, which fixes the unibyteness of the nndoc
buffer is not part of emacs 27:
commit 9d0385d7c7adc810dfd06321b783593b7afb3d58
Author: Lars Ingebrigtsen <larsi@gnus.org>
Date: Fri Aug 21 15:36:45 2020 +0200
Fix problem with 8bit content-transfer-encoding in nndoc mbox files
* lisp/gnus/nndoc.el (nndoc-possibly-change-buffer): If we're
reading an mbox file, it may contain messages that use
content-transfer-encoding 8bit, which means that we have to treat
the file as a sequence of byte (bug#42951). This avoids
double-decoding -- once by Emacs when inserting the mbox into the
buffer, and once by Gnus when displaying the articles.
So when mm-with-part process the MIME parts of the problematic message
read from the nndoc group, it receives a multibyte buffer in Emacs 27
but a unibyte buffer in Emacs 28.
However the issue is not restricted to nndoc.
With both emacs 27 & 28 I'm still having the original issue with mail
read using nnmaildir. So maybe nnmaildir deserves a similar fix?
I'm not quite sure where that would go. nnmaildir-request-article?
In any way I'm currently running Gnus with the following change:
--- a/lisp/gnus/mm-decode.el
+++ b/lisp/gnus/mm-decode.el
@@ -1264,8 +1264,8 @@ mm-with-part
(when (and (mm-handle-buffer handle)
(buffer-name (mm-handle-buffer handle)))
(with-temp-buffer
- (mm-disable-multibyte)
(insert-buffer-substring (mm-handle-buffer handle))
+ (mm-disable-multibyte)
(mm-decode-content-transfer-encoding
(mm-handle-encoding handle)
(mm-handle-media-type handle))
and that seems to solve my problem in both version of Emacs, and in both
nndoc or nnmaildir.
--
Alexandre Duret-Lutz
- bug#44307: 27.1; UTF-8 parts transferred as 8bit in multipart messages fail to decode, Alexandre Duret-Lutz, 2021/01/02
- bug#44307: 27.1; UTF-8 parts transferred as 8bit in multipart messages fail to decode, Alexandre Duret-Lutz, 2021/01/04
- bug#44307: 27.1; UTF-8 parts transferred as 8bit in multipart messages fail to decode,
Alexandre Duret-Lutz <=
- bug#44307: 27.1; UTF-8 parts transferred as 8bit in multipart messages fail to decode, Lars Ingebrigtsen, 2021/01/05
- bug#44307: 27.1; UTF-8 parts transferred as 8bit in multipart messages fail to decode, Alexandre Duret-Lutz, 2021/01/05
- bug#44307: 27.1; UTF-8 parts transferred as 8bit in multipart messages fail to decode, Lars Ingebrigtsen, 2021/01/07
- bug#44307: 27.1; UTF-8 parts transferred as 8bit in multipart messages fail to decode, Alexandre Duret-Lutz, 2021/01/07
- bug#44307: 27.1; UTF-8 parts transferred as 8bit in multipart messages fail to decode, Lars Ingebrigtsen, 2021/01/07
- bug#44307: 27.1; UTF-8 parts transferred as 8bit in multipart messages fail to decode, Alexandre Duret-Lutz, 2021/01/07
- bug#44307: 27.1; UTF-8 parts transferred as 8bit in multipart messages fail to decode, Lars Ingebrigtsen, 2021/01/10