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diff --git a/lisp/gnus/rfc2231.el b/lisp/gnus/rfc2231.el
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+;;; rfc2231.el --- Functions for decoding rfc2231 headers
+
+;; Copyright (C) 1998, 1999, 2000 Free Software Foundation, Inc.
+
+;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 2, or (at your option)
+;; any later version.
+
+;; GNU Emacs is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs; see the file COPYING.  If not, write to the
+;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
+
+;;; Commentary:
+
+;;; Code:
+
+(require 'ietf-drums)
+
+(defun rfc2231-get-value (ct attribute)
+  "Return the value of ATTRIBUTE from CT."
+  (cdr (assq attribute (cdr ct))))
+
+(defun rfc2231-parse-string (string)
+  "Parse STRING and return a list.
+The list will be on the form
+ `(name (attribute . value) (attribute . value)...)"
+  (with-temp-buffer
+    (let ((ttoken (ietf-drums-token-to-list ietf-drums-text-token))
+	  (stoken (ietf-drums-token-to-list ietf-drums-tspecials))
+	  (ntoken (ietf-drums-token-to-list "0-9"))
+	  (prev-value "")
+	  display-name mailbox c display-string parameters
+	  attribute value type subtype number encoded
+	  prev-attribute)
+      (ietf-drums-init (mail-header-remove-whitespace
+			(mail-header-remove-comments string)))
+      (let ((table (copy-syntax-table ietf-drums-syntax-table)))
+	(modify-syntax-entry ?\' "w" table)
+	;; The following isn't valid, but one should be liberal
+	;; in what one receives.
+	(modify-syntax-entry ?\: "w" table)
+	(set-syntax-table table))
+      (setq c (char-after))
+      (when (and (memq c ttoken)
+		 (not (memq c stoken)))
+	(setq type (downcase (buffer-substring
+			      (point) (progn (forward-sexp 1) (point)))))
+	;; Do the params
+	(while (not (eobp))
+	  (setq c (char-after))
+	  (unless (eq c ?\;)
+	    (error "Invalid header: %s" string))
+	  (forward-char 1)
+	  ;; If c in nil, then this is an invalid header, but
+	  ;; since elm generates invalid headers on this form,
+	  ;; we allow it.
+	  (when (setq c (char-after))
+	    (if (and (memq c ttoken)
+		     (not (memq c stoken)))
+		(setq attribute
+		      (intern
+		       (downcase
+			(buffer-substring
+			 (point) (progn (forward-sexp 1) (point))))))
+	      (error "Invalid header: %s" string))
+	    (setq c (char-after))
+	    (setq encoded nil)
+	    (when (eq c ?*)
+	      (forward-char 1)
+	      (setq c (char-after))
+	      (when (memq c ntoken)
+		(setq number
+		      (string-to-number
+		       (buffer-substring
+			(point) (progn (forward-sexp 1) (point)))))
+		(setq c (char-after))
+		(when (eq c ?*)
+		  (setq encoded t)
+		  (forward-char 1)
+		  (setq c (char-after)))))
+	    ;; See if we have any previous continuations.
+	    (when (and prev-attribute
+		       (not (eq prev-attribute attribute)))
+	      (push (cons prev-attribute prev-value) parameters)
+	      (setq prev-attribute nil
+		    prev-value ""))
+	    (unless (eq c ?=)
+	      (error "Invalid header: %s" string))
+	    (forward-char 1)
+	    (setq c (char-after))
+	    (cond
+	     ((eq c ?\")
+	      (setq value
+		    (buffer-substring (1+ (point))
+				      (progn (forward-sexp 1) (1- (point))))))
+	     ((and (memq c ttoken)
+		   (not (memq c stoken)))
+	      (setq value (buffer-substring
+			   (point) (progn (forward-sexp 1) (point)))))
+	     (t
+	      (error "Invalid header: %s" string)))
+	    (when encoded
+	      (setq value (rfc2231-decode-encoded-string value)))
+	    (if number
+		(setq prev-attribute attribute
+		      prev-value (concat prev-value value))
+	      (push (cons attribute value) parameters))))
+
+	;; Take care of any final continuations.
+	(when prev-attribute
+	  (push (cons prev-attribute prev-value) parameters))
+
+	(when type
+	  `(,type ,@(nreverse parameters)))))))
+
+(defun rfc2231-decode-encoded-string (string)
+  "Decode an RFC2231-encoded string.
+These look like \"us-ascii'en-us'This%20is%20%2A%2A%2Afun%2A%2A%2A\"."
+  (with-temp-buffer
+    (let ((elems (split-string string "'")))
+      ;; The encoded string may contain zero to two single-quote
+      ;; marks.  This should give us the encoded word stripped
+      ;; of any preceding values.
+      (insert (car (last elems)))
+      (goto-char (point-min))
+      (while (search-forward "%" nil t)
+	(insert
+	 (prog1
+	     (string-to-number (buffer-substring (point) (+ (point) 2)) 16)
+	   (delete-region (1- (point)) (+ (point) 2)))))
+      ;; Encode using the charset, if any.
+      (when (and (< (length elems) 1)
+		 (not (equal (intern (car elems)) 'us-ascii)))
+	(mm-decode-coding-region (point-min) (point-max)
+				 (intern (car elems))))
+      (buffer-string))))
+
+(defun rfc2231-encode-string (param value)
+  "Return and PARAM=VALUE string encoded according to RFC2231."
+  (let ((control (ietf-drums-token-to-list ietf-drums-no-ws-ctl-token))
+	(tspecial (ietf-drums-token-to-list ietf-drums-tspecials))
+	(special (ietf-drums-token-to-list "*'%\n\t"))
+	(ascii (ietf-drums-token-to-list ietf-drums-text-token))
+	(num -1)
+	spacep encodep charsetp charset broken)
+    (with-temp-buffer
+      (insert value)
+      (goto-char (point-min))
+      (while (not (eobp))
+	(cond
+	 ((or (memq (following-char) control)
+	      (memq (following-char) tspecial)
+	      (memq (following-char) special))
+	  (setq encodep t))
+	 ((eq (following-char) ? )
+	  (setq spacep t))
+	 ((not (memq (following-char) ascii))
+	  (setq charsetp t)))
+	(forward-char 1))
+      (when charsetp
+	(setq charset (mm-encode-body)))
+      (cond
+       ((or encodep charsetp)
+	(goto-char (point-min))
+	(while (not (eobp))
+	  (when (> (current-column) 60)
+	    (insert "\n")
+	    (setq broken t))
+	  (if (or (not (memq (following-char) ascii))
+		  (memq (following-char) control)
+		  (memq (following-char) tspecial)
+		  (memq (following-char) special)
+		  (eq (following-char) ? ))
+	      (progn
+		(insert "%" (format "%02x" (following-char)))
+		(delete-char 1))
+	    (forward-char 1)))
+	(goto-char (point-min))
+	(insert (or charset "ascii") "''")
+	(goto-char (point-min))
+	(if (not broken)
+	    (insert param "*=")
+	  (while (not (eobp))
+	    (insert param "*" (format "%d" (incf num)) "*=")
+	    (forward-line 1))))
+       (spacep
+	(goto-char (point-min))
+	(insert param "=\"")
+	(goto-char (point-max))
+	(insert "\""))
+       (t
+	(goto-char (point-min))
+	(insert param "=")))
+      (buffer-string))))
+
+(provide 'rfc2231)
+
+;;; rfc2231.el ends here