1 ;;; mm-bodies.el --- Functions for decoding MIME things
2 ;; Copyright (C) 1998 Free Software Foundation, Inc.
4 ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
5 ;; MORIOKA Tomohiko <morioka@jaist.ac.jp>
6 ;; This file is part of GNU Emacs.
8 ;; GNU Emacs is free software; you can redistribute it and/or modify
9 ;; it under the terms of the GNU General Public License as published by
10 ;; the Free Software Foundation; either version 2, or (at your option)
13 ;; GNU Emacs is distributed in the hope that it will be useful,
14 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
15 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 ;; GNU General Public License for more details.
18 ;; You should have received a copy of the GNU General Public License
19 ;; along with GNU Emacs; see the file COPYING. If not, write to the
20 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
21 ;; Boston, MA 02111-1307, USA.
28 (or (fboundp 'base64-decode-region)
36 ;; 8bit treatment gets any char except: 0x32 - 0x7f, CR, LF, TAB, BEL,
37 ;; BS, vertical TAB, form feed, and ^_
38 (defvar mm-8bit-char-regexp "[^\x20-\x7f\r\n\t\x7\x8\xb\xc\x1f]")
40 (defun mm-encode-body ()
42 Should be called narrowed to the body that is to be encoded.
43 If there is more than one non-ASCII MULE charset, then list of found
44 MULE charsets are returned.
45 If successful, the MIME charset is returned.
46 If no encoding was done, nil is returned."
47 (if (not (featurep 'mule))
48 ;; In the non-Mule case, we search for non-ASCII chars and
49 ;; return the value of `mm-default-charset' if any are found.
51 (goto-char (point-min))
52 (if (re-search-forward "[^\x0-\x7f]" nil t)
54 ;; The logic in `mml-generate-mime-1' confirms that it's OK
55 ;; to return nil here.
58 (goto-char (point-min))
60 (delq 'ascii (mm-find-charset-region (point-min) (point-max))))
67 ((> (length charsets) 1)
72 (mm-mime-charset (car charsets) (point-min) (point-max)))
76 (not (mm-coding-system-equal
77 mime-charset buffer-file-coding-system)))
79 (if (eq (char-charset (char-after)) 'ascii)
82 (narrow-to-region start (point))
83 (mm-encode-coding-region start (point) mime-charset)
84 (goto-char (point-max)))
87 (setq start (point))))
90 (mm-encode-coding-region start (point) mime-charset)
94 (defun mm-body-encoding ()
95 "Return the encoding of the current buffer."
96 (cond ((not (featurep 'mule))
98 (goto-char (point-min))
99 (re-search-forward mm-8bit-char-regexp nil t))
104 (if (and (null (delq 'ascii (find-charset-region (point-min) (point-max))))
105 ;;!!!The following is necessary because the function
106 ;;!!!above seems to return the wrong result under
107 ;;!!!Emacs 20.3. Sometimes.
109 (goto-char (point-min))
110 (skip-chars-forward "\0-\177")
116 ;;; Functions for decoding
119 (defun mm-decode-content-transfer-encoding (encoding &optional type)
121 ((eq encoding 'quoted-printable)
122 (quoted-printable-decode-region (point-min) (point-max)))
123 ((eq encoding 'base64)
126 (base64-decode-region (point-min) (point-max))
128 (when (equal type "text/plain")
129 (goto-char (point-min))
130 (while (search-forward "\r\n" nil t)
131 (replace-match "\n" t t)))))
132 ((memq encoding '(7bit 8bit binary))
136 ((eq encoding 'x-uuencode)
138 (uudecode-decode-region (point-min) (point-max))
140 ((eq encoding 'x-binhex)
142 (binhex-decode-region (point-min) (point-max))
144 ((functionp encoding)
146 (funcall encoding (point-min) (point-max))
149 (message "Unknown encoding %s; defaulting to 8bit" encoding))))
151 (defun mm-decode-body (charset &optional encoding type)
152 "Decode the current article that has been encoded with ENCODING.
153 The characters in CHARSET should then be decoded."
154 (setq charset (or charset rfc2047-default-charset))
157 (mm-decode-content-transfer-encoding encoding type))
158 (when (featurep 'mule)
161 (setq mule-charset (mm-charset-to-coding-system charset))
162 ;; buffer-file-coding-system
163 ;Article buffer is nil coding system
165 enable-multibyte-characters
166 (or (not (eq mule-charset 'ascii))
167 (setq mule-charset rfc2047-default-charset)))
168 (mm-decode-coding-region (point-min) (point-max) mule-charset))))))
172 ;; mm-bodies.el ends here