--- /dev/null
+;;; eword-decode.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)
+;; Renamed: 1997/02/22 from tm-ew-d.el
+;; Version: $Revision: 0.0 $
+;; Keywords: encoded-word, MIME, multilingual, header, mail, news
+
+;; This file is part of SEMI (SEMI is Emacs MIME Interfaces).
+
+;; 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 'mime-def)
+(require 'tl-str)
+
+
+;;; @ version
+;;;
+
+(defconst eword-decode-RCS-ID
+ "$Id: eword-decode.el,v 0.0 1997-02-22 16:29:38 morioka Exp $")
+(defconst eword-decode-version (get-version-string eword-decode-RCS-ID))
+
+
+;;; @ MIME encoded-word definition
+;;;
+
+(defconst eword-encoded-text-regexp "[!->@-~]+")
+(defconst eword-encoded-word-regexp
+ (concat (regexp-quote "=?")
+ "\\("
+ eword-charset-regexp
+ "\\)"
+ (regexp-quote "?")
+ "\\(B\\|Q\\)"
+ (regexp-quote "?")
+ "\\("
+ eword-encoded-text-regexp
+ "\\)"
+ (regexp-quote "?=")))
+
+
+;;; @ for string
+;;;
+
+(defun eword-decode-string (string &optional must-unfold)
+ "Decode MIME encoded-words in STRING.
+
+STRING is unfolded before decoding.
+
+If an encoded-word is broken or your emacs implementation can not
+decode the charset included in it, it is not decoded.
+
+If MUST-UNFOLD is non-nil, it unfolds and eliminates line-breaks even
+if there are in decoded encoded-words (generated by bad manner MUA
+such as a version of Net$cape)."
+ (setq string (std11-unfold-string string))
+ (let ((dest "")(ew nil)
+ beg end)
+ (while (and (string-match eword-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]+$" (substring string 0 beg))
+ ))
+ (setq dest (concat dest (substring string 0 beg)))
+ )
+ )
+ (setq dest
+ (concat dest
+ (eword-decode-encoded-word
+ (substring string beg end) must-unfold)
+ ))
+ (setq string (substring string end))
+ (setq ew t)
+ )
+ (concat dest string)
+ ))
+
+
+;;; @ for region
+;;;
+
+(defun eword-decode-region (start end &optional unfolding must-unfold)
+ "Decode MIME encoded-words in region between START and END.
+
+If UNFOLDING is not nil, it unfolds before decoding.
+
+If MUST-UNFOLD is non-nil, it unfolds and eliminates line-breaks even
+if there are in decoded encoded-words (generated by bad manner MUA
+such as a version of Net$cape)."
+ (interactive "*r")
+ (save-excursion
+ (save-restriction
+ (narrow-to-region start end)
+ (if unfolding
+ (eword-decode-unfold)
+ )
+ (goto-char (point-min))
+ (while (re-search-forward (concat "\\(" eword-encoded-word-regexp "\\)"
+ "\\(\n?[ \t]\\)+"
+ "\\(" eword-encoded-word-regexp "\\)")
+ nil t)
+ (replace-match "\\1\\6")
+ (goto-char (point-min))
+ )
+ (let (charset encoding text)
+ (while (re-search-forward eword-encoded-word-regexp nil t)
+ (insert (eword-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 eword-decode-message-header ()
+ "Decode MIME encoded-words in message header."
+ (interactive "*")
+ (save-excursion
+ (save-restriction
+ (narrow-to-region (goto-char (point-min))
+ (progn (re-search-forward "^$" nil t) (point)))
+ (eword-decode-region (point-min) (point-max) t)
+ )))
+
+(defun eword-decode-unfold ()
+ (goto-char (point-min))
+ (let (field beg end)
+ (while (re-search-forward std11-field-head-regexp nil t)
+ (setq beg (match-beginning 0)
+ end (std11-field-end))
+ (setq field (buffer-substring beg end))
+ (if (string-match eword-encoded-word-regexp field)
+ (save-restriction
+ (narrow-to-region (goto-char beg) end)
+ (while (re-search-forward "\n\\([ \t]\\)" nil t)
+ (replace-match (match-string 1))
+ )
+ (goto-char (point-max))
+ ))
+ )))
+
+
+;;; @ encoded-word decoder
+;;;
+
+(defun eword-decode-encoded-word (word &optional must-unfold)
+ "Decode WORD if it is an encoded-word.
+
+If your emacs implementation can not decode the charset of WORD, it
+returns WORD. Similarly the encoded-word is broken, it returns WORD.
+
+If MUST-UNFOLD is non-nil, it unfolds and eliminates line-breaks even
+if there are in decoded encoded-word (generated by bad manner MUA such
+as a version of Net$cape)."
+ (or (if (string-match eword-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
+ (eword-decode-encoded-text charset encoding text must-unfold)
+ (error
+ (and (tl:add-text-properties 0 (length word)
+ (and tm:warning-face
+ (list 'face tm:warning-face))
+ word)
+ word)))
+ ))
+ word))
+
+
+;;; @ encoded-text decoder
+;;;
+
+(defun eword-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)."
+ (let ((cs (mime-charset-to-coding-system charset)))
+ (if cs
+ (let ((dest
+ (cond
+ ((string-equal "B" encoding)
+ (if (and (string-match eword-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 eword-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 'eword-decode)
+
+;;; eword-decode.el ends here
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