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-dl-encode-string 'encode-base64-string)
39 (defalias 'base64-dl-decode-string 'decode-base64-string)
41 (defun base64-dl-encode-region (start end)
42 "Encode current region by base64.
43 START and END are buffer positions."
45 (let ((str (buffer-substring start end)))
46 (delete-region start end)
47 (insert (encode-base64-string str))
53 (defun base64-dl-decode-region (start end)
54 "Decode current region by base64.
55 START and END are buffer positions."
57 (let ((str (buffer-substring start end)))
58 (delete-region start end)
60 (insert (decode-base64-string str))
61 (error (message (nth 1 err)))
64 (defalias 'base64-encode-string 'encode-base64-string)
65 (defalias 'base64-decode-string 'decode-base64-string)
66 (defalias 'base64-encode-region 'base64-dl-encode-region)
67 (defalias 'base64-decode-region 'base64-dl-decode-region)
70 ;;; @ base64 encoder/decoder for file
73 (defvar base64-external-encoder '("mmencode")
74 "*list of base64 encoder program name and its arguments.")
76 (defvar base64-external-decoder '("mmencode" "-u")
77 "*list of base64 decoder program name and its arguments.")
79 (defvar base64-external-decoder-option-to-specify-file '("-o")
80 "*list of options of base64 decoder program to specify file.")
82 (defun base64-insert-encoded-file (filename)
83 "Encode contents of file FILENAME to base64, and insert the result.
84 It calls external base64 encoder specified by
85 `base64-external-encoder'. So you must install the program (maybe
86 mmencode included in metamail or XEmacs package)."
87 (interactive (list (read-file-name "Insert encoded file: ")))
88 (apply (function call-process) (car base64-external-encoder)
89 filename t nil (cdr base64-external-encoder))
92 (defun base64-write-decoded-region (start end filename)
93 "Decode and write current region encoded by base64 into FILENAME.
94 START and END are buffer positions."
96 (list (region-beginning) (region-end)
97 (read-file-name "Write decoded region to file: ")))
99 (apply (function call-process-region)
100 start end (car base64-external-decoder)
102 (append (cdr base64-external-decoder)
103 base64-external-decoder-option-to-specify-file
111 (defun base64-encoded-length (string)
112 (let ((len (length string)))
114 (if (= (mod len 3) 0) 0 1)
124 ;;; mel-dl.el ends here.