1 ;;; mm-encode.el --- Functions for encoding 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.
30 (defvar mm-content-transfer-encoding-defaults
31 '(("text/.*" quoted-printable)
32 ("application/emacs-lisp" 8bit)
34 "Alist of regexps that match MIME types and their encodings.")
36 (defun mm-insert-rfc822-headers (charset encoding)
37 "Insert text/plain headers with CHARSET and ENCODING."
38 (insert "MIME-Version: 1.0\n")
39 (insert "Content-Type: text/plain; charset="
40 (mail-quote-string (downcase (symbol-name charset))) "\n")
41 (insert "Content-Transfer-Encoding: "
42 (downcase (symbol-name encoding)) "\n"))
44 (defun mm-insert-multipart-headers ()
45 "Insert multipart/mixed headers."
46 (let ((boundary "=-=-="))
47 (insert "MIME-Version: 1.0\n")
48 (insert (format "Content-Type: multipart/mixed; boundary=\"%s\"\n"
52 (defun mm-default-file-encoding (file)
53 "Return a default encoding for FILE."
54 (if (not (string-match "\\.[^.]+$" file))
55 "application/octet-stream"
56 (mailcap-extension-to-mime (match-string 0 file))))
58 (defun mm-encode-content-transfer-encoding (encoding &optional type)
60 ((eq encoding 'quoted-printable)
61 (quoted-printable-encode-region (point-min) (point-max)))
62 ((eq encoding 'base64)
63 (when (equal type "text/plain")
64 (goto-char (point-min))
65 (while (search-forward "\n" nil t)
66 (replace-match "\r\n" t t)))
68 (base64-encode-region (point-min) (point-max))
70 ((memq encoding '(7bit 8bit binary))
74 ;;((eq encoding 'x-uuencode)
76 ;; (uudecode-encode-region (point-min) (point-max))
80 (funcall encoding (point-min) (point-max))
83 (message "Unknown encoding %s; defaulting to 8bit" encoding))))
85 (defun mm-encode-buffer (type)
86 "Encode the buffer which contains data of TYPE.
87 The encoding used is returned."
88 (let* ((mime-type (if (stringp type) type (car type)))
91 (cadr (assq 'encoding type)))
92 (mm-content-transfer-encoding mime-type))))
93 (mm-encode-content-transfer-encoding encoding mime-type)
96 (defun mm-insert-headers (type encoding &optional file)
97 "Insert headers for TYPE."
98 (insert "Content-Type: " type)
100 (insert ";\n\tname=\"" (file-name-nondirectory file) "\""))
102 (insert (format "Content-Transfer-Encoding: %s\n" encoding))
103 (insert "Content-Disposition: inline")
105 (insert ";\n\tfilename=\"" (file-name-nondirectory file) "\""))
109 (defun mm-content-transfer-encoding (type)
110 "Return a CTE suitable for TYPE."
111 (let ((rules mm-content-transfer-encoding-defaults))
114 (when (string-match (caar rules) type)
115 (throw 'found (cadar rules)))
120 ;;; mm-encode.el ends here