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;;; tm-ew-d.el --- RFC 2047 based encoded-word decoder for GNU Emacs
;; Copyright (C) 1995,1996,1997 Free Software Foundation, Inc.
;; Author: ENAMI Tsugutomo <enami@sys.ptg.sony.co.jp>
;; MORIOKA Tomohiko <morioka@jaist.ac.jp>
;; Maintainer: MORIOKA Tomohiko <morioka@jaist.ac.jp>
;; Created: 1995/10/03
;; Original: 1992/07/20 ENAMI Tsugutomo's `mime.el'.
;; Renamed: 1993/06/03 to tiny-mime.el.
;; Renamed: 1995/10/03 from tiny-mime.el. (split off encoder)
;; Version: $Revision: 7.40 $
;; Keywords: encoded-word, MIME, multilingual, header, mail, news
;; This file is part of tm (Tools for MIME).
;; This program 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.
;; This program 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.
;;; Code:
(require 'emu)
(require 'std11)
(require 'mel)
(require 'tm-def)
(require 'tl-str)
;;; @ version
;;;
(defconst tm-ew-d/RCS-ID
"$Id: tm-ew-d.el,v 7.40 1997/03/06 17:53:51 morioka Exp $")
(defconst mime/eword-decoder-version (get-version-string tm-ew-d/RCS-ID))
;;; @ MIME encoded-word definition
;;;
(defconst mime/encoded-text-regexp "[!->@-~]+")
(defconst mime/encoded-word-regexp (concat (regexp-quote "=?")
"\\("
mime/charset-regexp
"\\)"
(regexp-quote "?")
"\\(B\\|Q\\)"
(regexp-quote "?")
"\\("
mime/encoded-text-regexp
"\\)"
(regexp-quote "?=")))
;;; @ for string
;;;
(defun mime-eword/decode-string (string &optional must-unfold)
"Decode MIME encoded-words in STRING.
STRING is unfolded before decoding.
If an encoded-word is broken or your emacs implementation can not
decode the charset included in it, it is not decoded.
If MUST-UNFOLD is non-nil, it unfolds and eliminates line-breaks even
if there are in decoded encoded-words (generated by bad manner MUA
such as a version of Net$cape). [tm-ew-d.el]"
(setq string (std11-unfold-string string))
(let ((dest "")(ew nil)
beg end)
(while (and (string-match mime/encoded-word-regexp string)
(setq beg (match-beginning 0)
end (match-end 0))
)
(if (> beg 0)
(if (not
(and (eq ew t)
(string-match "^[ \t]+$" (substring string 0 beg))
))
(setq dest (concat dest (substring string 0 beg)))
)
)
(setq dest
(concat dest
(mime/decode-encoded-word
(substring string beg end) must-unfold)
))
(setq string (substring string end))
(setq ew t)
)
(concat dest string)
))
;;; @ for region
;;;
(defun mime-eword/decode-region (start end &optional unfolding must-unfold)
"Decode MIME encoded-words in region between START and END.
If UNFOLDING is not nil, it unfolds before decoding.
If MUST-UNFOLD is non-nil, it unfolds and eliminates line-breaks even
if there are in decoded encoded-words (generated by bad manner MUA
such as a version of Net$cape). [tm-ew-d.el]"
(interactive "*r")
(save-excursion
(save-restriction
(narrow-to-region start end)
(if unfolding
(mime/unfolding)
)
(goto-char (point-min))
(while (re-search-forward (concat "\\(" mime/encoded-word-regexp "\\)"
"\\(\n?[ \t]\\)+"
"\\(" mime/encoded-word-regexp "\\)")
nil t)
(replace-match "\\1\\6")
(goto-char (point-min))
)
(let (charset encoding text)
(while (re-search-forward mime/encoded-word-regexp nil t)
(insert (mime/decode-encoded-word
(prog1
(buffer-substring (match-beginning 0) (match-end 0))
(delete-region (match-beginning 0) (match-end 0))
) must-unfold))
))
)))
;;; @ for message header
;;;
(defun mime/decode-message-header ()
"Decode MIME encoded-words in message header. [tm-ew-d.el]"
(interactive "*")
(save-excursion
(save-restriction
(narrow-to-region (goto-char (point-min))
(progn (re-search-forward "^$" nil t) (point)))
(mime-eword/decode-region (point-min) (point-max) t)
)))
(defun mime/unfolding ()
(goto-char (point-min))
(let (field beg end)
(while (re-search-forward std11-field-head-regexp nil t)
(setq beg (match-beginning 0)
end (std11-field-end))
(setq field (buffer-substring beg end))
(if (string-match mime/encoded-word-regexp field)
(save-restriction
(narrow-to-region (goto-char beg) end)
(while (re-search-forward "\n\\([ \t]\\)" nil t)
(replace-match
(match-string 1))
)
(goto-char (point-max))
))
)))
;;; @ encoded-word decoder
;;;
(defun mime/decode-encoded-word (word &optional must-unfold)
"Decode WORD if it is an encoded-word.
If your emacs implementation can not decode the charset of WORD, it
returns WORD. Similarly the encoded-word is broken, it returns WORD.
If MUST-UNFOLD is non-nil, it unfolds and eliminates line-breaks even
if there are in decoded encoded-word (generated by bad manner MUA such
as a version of Net$cape). [tm-ew-d.el]"
(or (if (string-match mime/encoded-word-regexp word)
(let ((charset
(substring word (match-beginning 1) (match-end 1))
)
(encoding
(upcase
(substring word (match-beginning 2) (match-end 2))
))
(text
(substring word (match-beginning 3) (match-end 3))
))
(condition-case err
(mime/decode-encoded-text charset encoding text must-unfold)
(error
(and (add-text-properties 0 (length word)
(and tm:warning-face
(list 'face tm:warning-face))
word)
word)))
))
word))
;;; @ encoded-text decoder
;;;
(defun mime/decode-encoded-text (charset encoding string &optional must-unfold)
"Decode STRING as an encoded-text.
If your emacs implementation can not decode CHARSET, it returns nil.
If ENCODING is not \"B\" or \"Q\", it occurs error.
So you should write error-handling code if you don't want break by errors.
If MUST-UNFOLD is non-nil, it unfolds and eliminates line-breaks even
if there are in decoded encoded-text (generated by bad manner MUA such
as a version of Net$cape). [tm-ew-d.el]"
(let ((cs (mime-charset-to-coding-system charset)))
(if cs
(let ((dest
(cond
((string-equal "B" encoding)
(if (and (string-match mime/B-encoded-text-regexp string)
(string-equal string (match-string 0 string)))
(base64-decode-string string)
(error "Invalid encoded-text %s" string)))
((string-equal "Q" encoding)
(if (and (string-match mime/Q-encoded-text-regexp string)
(string-equal string (match-string 0 string)))
(q-encoding-decode-string string)
(error "Invalid encoded-text %s" string)))
(t
(error "Invalid encoding %s" encoding)
)))
)
(if dest
(progn
(setq dest (decode-coding-string dest cs))
(if must-unfold
(mapconcat (function
(lambda (chr)
(cond
((eq chr ?\n) "")
((eq chr ?\t) " ")
(t (char-to-string chr)))
))
(std11-unfold-string dest)
"")
dest)
))))))
;;; @ end
;;;
(provide 'tm-ew-d)
;;; tm-ew-d.el ends here
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