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From: Katsumi Yamaoka <yamaoka@jpl.org>
Newsgroups: gmane.emacs.gnus.general
Subject: rfc2231 bug
Date: Tue, 18 Apr 2006 08:27:29 +0900
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Hi,

The most recent changes in rfc2231-parse-string cause a bug.
This is the test case:

(rfc2231-parse-string
 (concat "Content-Disposition: attachment;"
	 (rfc2231-encode-string
	  "filename"
	  "一二三四五六七八九零一二三四五六七八九零.pdf")))
 => ("content-disposition:attachment"
     (filename . "一二三四五六七八九零一二三四8^O;<7H,6eNm\e(B.pdf"))

It is because each segmented encoded text is decoded before
concatenating them.  I once fixed this problem as follows:

2004-12-21  Katsumi Yamaoka  <yamaoka@jpl.org>

	* rfc2231.el (rfc2231-parse-string): Decode encoded value after
	concatenating segments rather than before concatenating them.
	Suggested by ARISAWA Akihiro <ari@mbf.ocn.ne.jp>.