From 757785ef98ed6f5ea949ca5b7a9c16fd131ccd39 Mon Sep 17 00:00:00 2001 From: morioka Date: Sat, 22 Feb 1997 16:29:38 +0000 Subject: [PATCH] *** empty log message *** --- eword-decode.el | 267 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 267 insertions(+) create mode 100644 eword-decode.el diff --git a/eword-decode.el b/eword-decode.el new file mode 100644 index 0000000..aa26905 --- /dev/null +++ b/eword-decode.el @@ -0,0 +1,267 @@ +;;; eword-decode.el --- RFC 2047 based encoded-word decoder for GNU Emacs + +;; Copyright (C) 1995,1996,1997 Free Software Foundation, Inc. + +;; Author: ENAMI Tsugutomo +;; MORIOKA Tomohiko +;; Maintainer: MORIOKA Tomohiko +;; 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 -- 1.7.10.4