From: "Evgeny M. Zubok" <evgeny.zubok@tochka.ru>
Subject: Re: bug#8070: gnus damages attached file
Newsgroups: gnus.gnus-bug
Date: Sun, 20 Feb 2011 13:41:40 +0300
Organization: Gnus News User Services


I can confirm this strange behaviour. Gnus converts attachments from
8-bit coding system like cp1251 (viewing it as iso-8859-1 text) to
utf-8. It seems to occur only with files that have MIME supertype
"text". When I send README.doc with plain unibyte text in cp1251
simultaneously as "text/plain" (or "text/x-tex" for instance) and
"application/msword" (or "application/octet-stream") it received
differently:

as "text/plain", "text/x-tex", etc.

-rw-r--r-- 1 zubok zubok  9 Фев 20 12:56 README.doc
-rw------- 1 zubok zubok 17 Фев 20 12:58 README1.doc.received
                        ^^^
Raw mail:

Content-Type: text/plain; charset=utf-8
Content-Disposition: attachment; filename=README.doc
Content-Transfer-Encoding: base64


as "application/msword", "application/octet-stream"

-rw-r--r-- 1 zubok zubok 9 Фев 20 12:56 README.doc
-rw------- 1 zubok zubok 9 Фев 20 12:58 README2.doc.received
                        ^^^
Raw mail:

Content-Type: application/msword
Content-Disposition: attachment; filename=README.doc
Content-Transfer-Encoding: base64


Additional information
======================

Emacs 22.2.1, Gnus 5.11. Both from Debian.

The variable mm-coding-system-priorities is nil by default.

Relevant settings from ~/.emacs:

(set-language-environment 'utf-8)
(set-terminal-coding-system 'utf-8)
(set-keyboard-coding-system 'utf-8)
(set-selection-coding-system 'compound-text)
(setq x-select-request-type '(UTF8_STRING COMPOUND_TEXT TEXT STRING))

(codepage-setup 1251)
(codepage-setup 866)
(define-coding-system-alias 'ibm866 'cp866)
(define-coding-system-alias 'windows-1251 'cp1251)
(define-coding-system-alias 'koi8-u 'koi8-r)
(define-coding-system-alias 'utf8 'utf-8)

Locale settings:

$ locale
LANG=ru_RU.UTF-8
LC_CTYPE="ru_RU.UTF-8"
LC_NUMERIC="ru_RU.UTF-8"
LC_TIME="ru_RU.UTF-8"
LC_COLLATE="ru_RU.UTF-8"
LC_MONETARY="ru_RU.UTF-8"
LC_MESSAGES="ru_RU.UTF-8"
LC_PAPER="ru_RU.UTF-8"
LC_NAME="ru_RU.UTF-8"
LC_ADDRESS="ru_RU.UTF-8"
LC_TELEPHONE="ru_RU.UTF-8"
LC_MEASUREMENT="ru_RU.UTF-8"
LC_IDENTIFICATION="ru_RU.UTF-8"
LC_ALL=