+++ /dev/null
-;;; mel-b.el: Base64 encoder/decoder for GNU Emacs
-
-;; Copyright (C) 1992,1995,1996,1997,1998 Free Software Foundation, Inc.
-
-;; Author: ENAMI Tsugutomo <enami@sys.ptg.sony.co.jp>
-;; MORIOKA Tomohiko <morioka@jaist.ac.jp>
-;; Created: 1995/6/24
-;; 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)
-
-
-;;; @ variables
-;;;
-
-(defvar base64-external-encoder '("mmencode")
- "*list of base64 encoder program name and its arguments.")
-
-(defvar base64-external-decoder '("mmencode" "-u")
- "*list of base64 decoder program name and its arguments.")
-
-(defvar base64-external-decoder-option-to-specify-file '("-o")
- "*list of options of base64 decoder program to specify file.")
-
-(defvar base64-internal-encoding-limit 1000
- "*limit size to use internal base64 encoder.
-If size of input to encode is larger than this limit,
-external encoder is called.")
-
-(defvar base64-internal-decoding-limit 1000
- "*limit size to use internal base64 decoder.
-If size of input to decode is larger than this limit,
-external decoder is called.")
-
-
-;;; @ internal base64 decoder/encoder
-;;; based on base64 decoder by Enami Tsugutomo
-
-;;; @@ convert from/to base64 char
-;;;
-
-(defun base64-num-to-char (n)
- (cond ((eq n nil) ?=)
- ((< n 26) (+ ?A n))
- ((< n 52) (+ ?a (- n 26)))
- ((< n 62) (+ ?0 (- n 52)))
- ((= n 62) ?+)
- ((= n 63) ?/)
- (t (error "not a base64 integer %d" n))))
-
-(defun base64-char-to-num (c)
- (cond ((and (<= ?A c) (<= c ?Z)) (- c ?A))
- ((and (<= ?a c) (<= c ?z)) (+ (- c ?a) 26))
- ((and (<= ?0 c) (<= c ?9)) (+ (- c ?0) 52))
- ((= c ?+) 62)
- ((= c ?/) 63)
- ((= c ?=) nil)
- (t (error "not a base64 character %c" c))))
-
-
-;;; @@ encode/decode one base64 unit
-;;;
-
-(defun base64-encode-1 (pack)
- (let ((a (car pack))
- (b (nth 1 pack))
- (c (nth 2 pack)))
- (concat
- (char-to-string (base64-num-to-char (ash a -2)))
- (if b
- (concat
- (char-to-string
- (base64-num-to-char (logior (ash (logand a 3) 4) (ash b -4))))
- (if c
- (concat
- (char-to-string
- (base64-num-to-char (logior (ash (logand b 15) 2) (ash c -6))))
- (char-to-string (base64-num-to-char (logand c 63)))
- )
- (concat (char-to-string
- (base64-num-to-char (ash (logand b 15) 2))) "=")
- ))
- (concat (char-to-string
- (base64-num-to-char (ash (logand a 3) 4))) "==")
- ))))
-
-(defun base64-decode-unit (a b &optional c d)
- (condition-case err
- (concat
- (char-to-string (logior (ash (base64-char-to-num a) 2)
- (ash (setq b (base64-char-to-num b)) -4)))
- (if (and c (setq c (base64-char-to-num c)))
- (concat (char-to-string
- (logior (ash (logand b 15) 4) (ash c -2)))
- (if (and d (setq d (base64-char-to-num d)))
- (char-to-string (logior (ash (logand c 3) 6) d))
- ))))
- (error (message (nth 1 err))
- "")))
-
-
-;;; @@ base64 encoder/decoder for string
-;;;
-
-(defun base64-encode-string (string)
- "Encode STRING to base64, and return the result."
- (let ((len (length string))
- (b 0)(e 57)
- dest)
- (while (< e len)
- (setq dest
- (concat dest
- (mapconcat
- (function base64-encode-1)
- (pack-sequence (substring string b e) 3)
- "")
- "\n"))
- (setq b e
- e (+ e 57)
- )
- )
- (let* ((es (mapconcat
- (function base64-encode-1)
- (pack-sequence (substring string b) 3)
- ""))
- (m (mod (length es) 4))
- )
- (concat dest es (cond ((= m 3) "=")
- ((= m 2) "==")
- ))
- )))
-
-(defun base64-internal-decode-string (string)
- (let ((len (length string))
- (i 0)
- dest)
- (while (< i len)
- (let ((a (aref string i)))
- (setq i (1+ i))
- (unless (eq a ?\n)
- (let ((b (aref string i)))
- (setq i (1+ i))
- (cond
- ((eq b ?\n)
- ;; invalid
- )
- ((>= i len)
- (setq dest (concat dest (base64-decode-unit a b) ))
- )
- (t
- (let ((c (aref string i)))
- (setq i (1+ i))
- (cond
- ((eq c ?\n)
- (setq dest (concat dest (base64-decode-unit a b)))
- )
- ((>= i len)
- (setq dest (concat dest (base64-decode-unit a b c)))
- )
- (t
- (let ((d (aref string i)))
- (setq i (1+ i))
- (setq dest
- (concat dest
- (if (eq c ?\n)
- (base64-decode-unit a b c)
- (base64-decode-unit a b c d))))
- ))))))))))
- dest))
-
-
-;;; @ base64 encoder/decoder for region
-;;;
-
-(defun base64-internal-encode-region (beg end)
- (save-excursion
- (save-restriction
- (narrow-to-region beg end)
- (let ((str (buffer-substring beg end)))
- (delete-region beg end)
- (insert (base64-encode-string str))
- )
- (or (bolp)
- (insert "\n")
- )
- )))
-
-(defun base64-internal-decode-region (beg end)
- (save-excursion
- (let ((str (buffer-substring beg end)))
- (delete-region beg end)
- (goto-char beg)
- (insert (base64-internal-decode-string str)))))
-
-(defun base64-external-encode-region (beg end)
- (save-excursion
- (save-restriction
- (narrow-to-region beg end)
- (as-binary-process (apply (function call-process-region)
- beg end (car base64-external-encoder)
- t t nil (cdr base64-external-encoder))
- )
- ;; for OS/2
- ;; regularize line break code
- (goto-char (point-min))
- (while (re-search-forward "\r$" nil t)
- (replace-match "")
- )
- )))
-
-(defun base64-external-decode-region (beg end)
- (save-excursion
- (as-binary-process (apply (function call-process-region)
- beg end (car base64-external-decoder)
- t t nil (cdr base64-external-decoder))
- )))
-
-(defun base64-external-decode-string (string)
- (with-temp-buffer
- (insert string)
- (as-binary-process (apply (function call-process-region)
- (point-min) (point-max)
- (car base64-external-decoder)
- t t nil (cdr base64-external-decoder))
- )
- (buffer-string)))
-
-
-(defun base64-encode-region (start end)
- "Encode current region by base64.
-START and END are buffer positions.
-This function calls internal base64 encoder if size of region is
-smaller than `base64-internal-encoding-limit', otherwise it calls
-external base64 encoder specified by `base64-external-encoder'. In
-this case, you must install the program (maybe mmencode included in
-metamail or XEmacs package)."
- (interactive "r")
- (if (and base64-internal-encoding-limit
- (> (- end start) base64-internal-encoding-limit))
- (base64-external-encode-region start end)
- (base64-internal-encode-region start end)
- ))
-
-(defun base64-decode-region (start end)
- "Decode current region by base64.
-START and END are buffer positions.
-This function calls internal base64 decoder if size of region is
-smaller than `base64-internal-decoding-limit', otherwise it calls
-external base64 decoder specified by `base64-external-decoder'. In
-this case, you must install the program (maybe mmencode included in
-metamail or XEmacs package)."
- (interactive "r")
- (if (and base64-internal-decoding-limit
- (> (- end start) base64-internal-decoding-limit))
- (base64-external-decode-region start end)
- (base64-internal-decode-region start end)
- ))
-
-(defun base64-decode-string (string)
- "Decode STRING which is encoded in base64, and return the result.
-This function calls internal base64 decoder if size of STRING is
-smaller than `base64-internal-decoding-limit', otherwise it calls
-external base64 decoder specified by `base64-external-decoder'. In
-this case, you must install the program (maybe mmencode included in
-metamail or XEmacs package)."
- (interactive "r")
- (if (and base64-internal-decoding-limit
- (> (length string) base64-internal-decoding-limit))
- (base64-external-decode-string string)
- (base64-internal-decode-string string)
- ))
-
-
-;;; @ base64 encoder/decoder for file
-;;;
-
-(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))
- )
-
-(defun base64-write-decoded-region (start end filename)
- "Decode and write current region encoded by base64 into FILENAME.
-START and END are buffer positions."
- (interactive
- (list (region-beginning) (region-end)
- (read-file-name "Write decoded region to file: ")))
- (as-binary-process
- (apply (function call-process-region)
- start end (car base64-external-decoder)
- nil nil nil
- (append (cdr base64-external-decoder)
- base64-external-decoder-option-to-specify-file
- (list filename))
- )))
-
-
-;;; @ etc
-;;;
-
-(defun base64-encoded-length (string)
- (let ((len (length string)))
- (* (+ (/ len 3)
- (if (= (mod len 3) 0) 0 1)
- ) 4)
- ))
-
-(defun pack-sequence (seq size)
- "Split sequence SEQ into SIZE elements packs,
-and return list of packs. [mel-b; tl-seq function]"
- (let ((len (length seq)) (p 0) obj
- unit (i 0)
- dest)
- (while (< p len)
- (setq obj (elt seq p))
- (setq unit (cons obj unit))
- (setq i (1+ i))
- (if (= i size)
- (progn
- (setq dest (cons (reverse unit) dest))
- (setq unit nil)
- (setq i 0)
- ))
- (setq p (1+ p))
- )
- (if unit
- (setq dest (cons (reverse unit) dest))
- )
- (reverse dest)
- ))
-
-
-;;; @ end
-;;;
-
-(provide 'mel-b)
-
-;;; mel-b.el ends here.
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