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+;;; mel-dl.el: Base64 encoder/decoder using DL module
+
+;; Copyright (C) 1998 Free Software Foundation, Inc.
+
+;; Author: MORIOKA Tomohiko <morioka@jaist.ac.jp>
+;; Version: $Id: mel-dl.el,v 1.1 1998-01-11 16:21:43 morioka Exp $
+;; Keywords: MIME, Base64
+
+;; This file is part of MEL (MIME Encoding Library).
+
+;; This program is free software; you can redistribute it and/or
+;; modify it under the terms of the GNU General Public License as
+;; published by the Free Software Foundation; either version 2, or (at
+;; your option) any later version.
+
+;; This program is distributed in the hope that it will be useful, but
+;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+;; General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs; see the file COPYING.  If not, write to the
+;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
+
+;;; Code:
+
+(require 'emu)
+
+(defvar base64-dl-module
+  (expand-file-name "base64.so" exec-directory))
+
+(defvar base64-dl-handle
+  (and (file-exists-p base64-dl-module)
+       (dynamic-link base64-dl-module)))
+
+(dynamic-call "emacs_base64_init" base64-dl-handle)
+
+(defalias 'base64-encode-string 'encode-base64-string)
+(defalias 'base64-decode-string 'decode-base64-string)
+
+(defun base64-encode-region (start end)
+  "Encode current region by base64.
+START and END are buffer positions."
+  (interactive "r")
+  (save-excursion
+    (save-restriction
+      (narrow-to-region start end)
+      (let ((str (buffer-substring start end)))
+       (delete-region start end)
+       (insert (encode-base64-string str))
+       )
+      (or (bolp)
+         (insert "\n")
+         )
+      )))
+
+(defun base64-decode-region (start end)
+  "Decode current region by base64.
+START and END are buffer positions."
+  (interactive "r")
+  (save-excursion
+    (save-restriction
+      (narrow-to-region start end)
+      (goto-char (point-min))
+      (while (looking-at ".*\n")
+       (condition-case err
+           (replace-match
+            (decode-base64-string
+             (buffer-substring (match-beginning 0) (1- (match-end 0))))
+            t t)
+         (error
+          (prog1
+              (message (nth 1 err))
+            (replace-match "")))))
+      (if (looking-at ".*$")
+         (condition-case err
+             (replace-match
+              (decode-base64-string
+               (buffer-substring (match-beginning 0) (match-end 0)))
+              t t)
+           (error
+            (prog1
+                (message (nth 1 err))
+              (replace-match "")))
+           ))
+      )))
+
+
+;;; @ base64 encoder/decoder for file
+;;;
+
+(defvar base64-external-encoder '("mmencode")
+  "*list of base64 encoder program name and its arguments.")
+
+(defun base64-insert-encoded-file (filename)
+  "Encode contents of file FILENAME to base64, and insert the result.
+It calls external base64 encoder specified by
+`base64-external-encoder'.  So you must install the program (maybe
+mmencode included in metamail or XEmacs package)."
+  (interactive (list (read-file-name "Insert encoded file: ")))
+  (apply (function call-process) (car base64-external-encoder)
+        filename t nil (cdr base64-external-encoder))
+  )
+
+
+;;; @ etc
+;;;
+
+(defun base64-encoded-length (string)
+  (let ((len (length string)))
+    (* (+ (/ len 3)
+         (if (= (mod len 3) 0) 0 1)
+         ) 4)
+    ))
+
+
+;;; @ end
+;;;
+
+(provide 'mel-dl)
+
+;;; mel-dl.el ends here.