1 ;;; mel.el : a MIME encoding/decoding library
3 ;; Copyright (C) 1995,1996,1997,1998 Free Software Foundation, Inc.
5 ;; Author: MORIOKA Tomohiko <morioka@jaist.ac.jp>
7 ;; Keywords: MIME, Base64, Quoted-Printable, uuencode, gzip64
9 ;; This file is part of FLIM (Faithful Library about Internet Message).
11 ;; This program is free software; you can redistribute it and/or
12 ;; modify it under the terms of the GNU General Public License as
13 ;; published by the Free Software Foundation; either version 2, or (at
14 ;; your option) any later version.
16 ;; This program is distributed in the hope that it will be useful, but
17 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 ;; General Public License for more details.
21 ;; You should have received a copy of the GNU General Public License
22 ;; along with GNU Emacs; see the file COPYING. If not, write to the
23 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
24 ;; Boston, MA 02111-1307, USA.
31 (defcustom mime-encoding-list
32 '("7bit" "8bit" "binary" "base64" "quoted-printable")
33 "List of Content-Transfer-Encoding. Each encoding must be string."
35 :type '(repeat string))
37 (defun mime-encoding-list (&optional service)
38 "Return list of Content-Transfer-Encoding.
39 If SERVICE is specified, it returns available list of
40 Content-Transfer-Encoding for it."
43 (mapatoms (lambda (sym)
45 (setq dest (cons (symbol-name sym) dest)))
47 (symbol-value (intern (format "%s-obarray" service))))
48 (let ((rest mel-encoding-module-alist)
50 (while (setq pair (car rest))
51 (let ((key (car pair)))
54 (setq dest (cons key dest))))
55 (setq rest (cdr rest)))
60 (defun mime-encoding-alist (&optional service)
61 "Return table of Content-Transfer-Encoding for completion."
62 (mapcar #'list (mime-encoding-list service))
65 (defsubst mel-use-module (name encodings)
67 (while (setq encoding (car encodings))
68 (set-alist 'mel-encoding-module-alist
70 (cons name (cdr (assoc encoding mel-encoding-module-alist))))
71 (setq encodings (cdr encodings))
74 (defsubst mel-find-function (service encoding)
75 (mel-find-function-from-obarray
76 (symbol-value (intern (format "%s-obarray" service))) encoding))
79 ;;; @ setting for modules
82 (defvar mel-ccl-module (featurep 'mule))
84 (defvar mel-b-ccl-module
88 (module-installed-p 'mel-b-ccl)
91 (defvar mel-q-ccl-module
95 (module-installed-p 'mel-q-ccl)
98 (mel-use-module 'mel-b '("base64" "B"))
99 (mel-use-module 'mel-q '("quoted-printable" "Q"))
100 (mel-use-module 'mel-g '("x-gzip64"))
101 (mel-use-module 'mel-u '("x-uue" "x-uuencode"))
104 (mel-use-module 'mel-b-ccl '("base64" "B"))
108 (mel-use-module 'mel-q-ccl '("quoted-printable" "Q"))
112 (mel-use-module 'mel-b-dl '("base64" "B"))
115 (mel-define-backend "7bit")
116 (mel-define-method-function (mime-encode-string string (nil "7bit"))
118 (mel-define-method-function (mime-decode-string string (nil "7bit"))
120 (mel-define-method mime-encode-region (start end (nil "7bit")))
121 (mel-define-method mime-decode-region (start end (nil "7bit")))
122 (mel-define-method-function (mime-insert-encoded-file filename (nil "7bit"))
123 'insert-file-contents-as-binary)
124 (mel-define-method-function (mime-write-decoded-region
125 start end filename (nil "7bit"))
126 'write-region-as-binary)
128 (mel-define-backend "8bit" ("7bit"))
130 (mel-define-backend "binary" ("8bit"))
137 (defun mime-encode-region (start end encoding)
138 "Encode region START to END of current buffer using ENCODING.
139 ENCODING must be string."
141 (list (region-beginning) (region-end)
142 (completing-read "encoding: "
143 (mime-encoding-alist)
145 (funcall (mel-find-function 'mime-encode-region encoding) start end)
150 (defun mime-decode-region (start end encoding)
151 "Decode region START to END of current buffer using ENCODING.
152 ENCODING must be string."
154 (list (region-beginning) (region-end)
155 (completing-read "encoding: "
156 (mime-encoding-alist 'mime-decode-region)
158 (funcall (mel-find-function 'mime-decode-region encoding)
166 (defun mime-decode-string (string encoding)
167 "Decode STRING using ENCODING.
168 ENCODING must be string. If ENCODING is found in
169 `mime-string-decoding-method-alist' as its key, this function decodes
170 the STRING by its value."
171 (funcall (mel-find-function 'mime-decode-string encoding)
175 (mel-define-service encoded-text-encode-string (string encoding)
176 "Encode STRING as encoded-text using ENCODING.
177 ENCODING must be string.")
179 (mel-define-service encoded-text-decode-string (string encoding)
180 "Decode STRING as encoded-text using ENCODING.
181 ENCODING must be string.")
183 (defun base64-encoded-length (string)
184 (* (/ (+ (length string) 2) 3) 4))
186 (defsubst Q-encoding-printable-char-p (chr mode)
187 (and (not (memq chr '(?= ?? ?_)))
188 (<= ?\ chr)(<= chr ?~)
189 (cond ((eq mode 'text) t)
191 (not (memq chr '(?\( ?\) ?\\)))
194 (string-match "[A-Za-z0-9!*+/=_---]" (char-to-string chr))
197 (defun Q-encoded-text-length (string &optional mode)
198 (let ((l 0)(i 0)(len (length string)) chr)
200 (setq chr (elt string i))
201 (if (Q-encoding-printable-char-p chr mode)
213 (defun mime-insert-encoded-file (filename encoding)
214 "Insert file FILENAME encoded by ENCODING format."
216 (list (read-file-name "Insert encoded file: ")
217 (completing-read "encoding: "
218 (mime-encoding-alist)
220 (funcall (mel-find-function 'mime-insert-encoded-file encoding)
225 (defun mime-write-decoded-region (start end filename encoding)
226 "Decode and write current region encoded by ENCODING into FILENAME.
227 START and END are buffer positions."
229 (list (region-beginning) (region-end)
230 (read-file-name "Write decoded region to file: ")
231 (completing-read "encoding: "
232 (mime-encoding-alist 'mime-write-decoded-region)
234 (funcall (mel-find-function 'mime-write-decoded-region encoding)
243 ;;; mel.el ends here.