;;; mel-b.el --- Base64 encoder/decoder using builtin base64 handlers

;; Copyright (C) 1998,1999,2000,2001 Free Software Foundation, Inc.

;; Author: Tanaka Akira <akr@m17n.org>
;; Created by modifying mel-b-ccl.el: 2001/2/6
;; Keywords: MIME, Base64

;; This file is part of FLIM (Faithful Library about Internet Message).

;; 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 this program; 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 'mime-def)

(defun base64-insert-encoded-file (filename)
  "Encode contents of file FILENAME to base64, and insert the result."
  (interactive "*fInsert encoded file: ")
  (save-excursion
    (save-restriction
      (narrow-to-region (point) (point))
      (let ((coding-system-for-read 'binary))
	(insert-file-contents filename))
      (base64-encode-region (point-min) (point-max)))))

(mel-define-method-function (mime-encode-string string (nil "base64"))
			    'base64-encode-string)
(mel-define-method-function (mime-encode-region start end (nil "base64"))
			    'base64-encode-region)
(mel-define-method-function (mime-insert-encoded-file filename (nil "base64"))
			    'base64-insert-encoded-file)
(mel-define-method-function (encoded-text-encode-string string (nil "B"))
			    'base64-encode-string)

(defun base64-write-decoded-region (start end filename)
  "Decode the region from START to END and write out to FILENAME."
  (interactive "*r\nFWrite decoded region to file: ")
  (let ((current (current-buffer))
	(multibyte enable-multibyte-characters))
    (with-temp-buffer
      (set-buffer-multibyte multibyte)
      (insert-buffer-substring current start end)
      (base64-decode-region (point-min) (point-max))
      (let ((coding-system-for-write 'binary))
	(write-region (point-min) (point-max) filename)))))

(mel-define-method-function (mime-decode-string string (nil "base64"))
			    'base64-ccl-decode-string)
(mel-define-method-function (mime-decode-region start end (nil "base64"))
			    'base64-ccl-decode-region)
(mel-define-method-function
 (mime-write-decoded-region start end filename (nil "base64"))
 'base64-write-decoded-region)

(mel-define-method encoded-text-decode-string (string (nil "B"))
  (if (string-match (eval-when-compile
		      (concat "\\`" B-encoded-text-regexp "\\'"))
		    string)
      (base64-decode-string string)
    (error "Invalid encoded-text %s" string)))


;;; @ end
;;;

(provide 'mel-b)

;;; mel-b.el ends here.