1 ;;; mel-dl.el: Base64 encoder/decoder using DL module
3 ;; Copyright (C) 1998 Free Software Foundation, Inc.
5 ;; Author: MORIOKA Tomohiko <morioka@jaist.ac.jp>
6 ;; Keywords: MIME, Base64
8 ;; This file is part of MEL (MIME Encoding Library).
10 ;; This program is free software; you can redistribute it and/or
11 ;; modify it under the terms of the GNU General Public License as
12 ;; published by the Free Software Foundation; either version 2, or (at
13 ;; your option) any later version.
15 ;; This program is distributed in the hope that it will be useful, but
16 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 ;; General Public License for more details.
20 ;; You should have received a copy of the GNU General Public License
21 ;; along with GNU Emacs; see the file COPYING. If not, write to the
22 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
23 ;; Boston, MA 02111-1307, USA.
29 (defvar base64-dl-module
30 (expand-file-name "base64.so" exec-directory))
32 (defvar base64-dl-handle
33 (and (file-exists-p base64-dl-module)
34 (dynamic-link base64-dl-module)))
36 (dynamic-call "emacs_base64_init" base64-dl-handle)
38 (defalias 'base64-encode-string 'encode-base64-string)
39 (defalias 'base64-decode-string 'decode-base64-string)
41 (defun base64-encode-region (start end)
42 "Encode current region by base64.
43 START and END are buffer positions."
47 (narrow-to-region start end)
48 (let ((str (buffer-substring start end)))
49 (delete-region start end)
50 (insert (encode-base64-string str))
57 (defun base64-decode-region (start end)
58 "Decode current region by base64.
59 START and END are buffer positions."
63 (narrow-to-region start end)
64 (goto-char (point-min))
65 (while (looking-at ".*\n")
69 (buffer-substring (match-beginning 0) (1- (match-end 0))))
74 (replace-match "")))))
75 (if (looking-at ".*$")
79 (buffer-substring (match-beginning 0) (match-end 0)))
89 ;;; @ base64 encoder/decoder for file
92 (defvar base64-external-encoder '("mmencode")
93 "*list of base64 encoder program name and its arguments.")
95 (defvar base64-external-decoder '("mmencode" "-u")
96 "*list of base64 decoder program name and its arguments.")
98 (defvar base64-external-decoder-option-to-specify-file '("-o")
99 "*list of options of base64 decoder program to specify file.")
101 (defun base64-insert-encoded-file (filename)
102 "Encode contents of file FILENAME to base64, and insert the result.
103 It calls external base64 encoder specified by
104 `base64-external-encoder'. So you must install the program (maybe
105 mmencode included in metamail or XEmacs package)."
106 (interactive (list (read-file-name "Insert encoded file: ")))
107 (apply (function call-process) (car base64-external-encoder)
108 filename t nil (cdr base64-external-encoder))
111 (defun base64-write-decoded-region (start end filename)
112 "Decode and write current region encoded by base64 into FILENAME.
113 START and END are buffer positions."
115 (list (region-beginning) (region-end)
116 (read-file-name "Write decoded region to file: ")))
118 (apply (function call-process-region)
119 start end (car base64-external-decoder)
121 (append (cdr base64-external-decoder)
122 base64-external-decoder-option-to-specify-file
130 (defun base64-encoded-length (string)
131 (let ((len (length string)))
133 (if (= (mod len 3) 0) 0 1)
143 ;;; mel-dl.el ends here.