+++ /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)
-(require 'mime-def)
-
-
-;;; @ variables
-;;;
-
-(defgroup base64 nil
- "Base64 encoder/decoder"
- :group 'mime)
-
-(defcustom base64-external-encoder '("mmencode")
- "*list of base64 encoder program name and its arguments."
- :group 'base64
- :type '(cons (file :tag "Command")(repeat :tag "Arguments" string)))
-
-(defcustom base64-external-decoder '("mmencode" "-u")
- "*list of base64 decoder program name and its arguments."
- :group 'base64
- :type '(cons (file :tag "Command")(repeat :tag "Arguments" string)))
-
-(defcustom base64-external-decoder-option-to-specify-file '("-o")
- "*list of options of base64 decoder program to specify file."
- :group 'base64
- :type '(repeat :tag "Arguments" string))
-
-(defcustom 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."
- :group 'base64
- :type '(choice (const :tag "Always use internal encoder" nil)
- (integer :tag "Size")))
-
-(defcustom base64-internal-decoding-limit (if (and (featurep 'xemacs)
- (featurep 'mule))
- 1000
- 7600)
- "*limit size to use internal base64 decoder.
-If size of input to decode is larger than this limit,
-external decoder is called."
- :group 'base64
- :type '(choice (const :tag "Always use internal decoder" nil)
- (integer :tag "Size")))
-
-
-;;; @ internal base64 encoder
-;;; based on base64 decoder by Enami Tsugutomo
-
-(eval-and-compile
- (defconst base64-characters
- "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/")
- )
-
-(defmacro base64-num-to-char (n)
- `(aref base64-characters ,n))
-
-(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-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-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")
- )
- )))
-
-
-;;; @ internal base64 decoder
-;;;
-
-(defconst base64-numbers
- (eval-when-compile
- (let ((len (length base64-characters))
- (vec (make-vector 123 nil))
- (i 0))
- (while (< i len)
- (aset vec (aref base64-characters i) i)
- (setq i (1+ i)))
- vec)))
-
-(defmacro base64-char-to-num (c)
- `(aref base64-numbers ,c))
-
-(defsubst base64-internal-decode (string buffer)
- (let* ((len (length string))
- (i 0)
- (j 0)
- v1 v2 v3)
- (catch 'tag
- (while (< i len)
- (when (prog1 (setq v1 (base64-char-to-num (aref string i)))
- (setq i (1+ i)))
- (setq v2 (base64-char-to-num (aref string i))
- i (1+ i)
- v3 (base64-char-to-num (aref string i))
- i (1+ i))
- (aset buffer j (logior (lsh v1 2)(lsh v2 -4)))
- (setq j (1+ j))
- (if v3
- (let ((v4 (base64-char-to-num (aref string i))))
- (setq i (1+ i))
- (aset buffer j (logior (lsh (logand v2 15) 4)(lsh v3 -2)))
- (setq j (1+ j))
- (if v4
- (aset buffer (prog1 j (setq j (1+ j)))
- (logior (lsh (logand v3 3) 6) v4))
- (throw 'tag nil)
- ))
- (throw 'tag nil)
- ))))
- (substring buffer 0 j)
- ))
-
-(defun base64-internal-decode-string (string)
- (base64-internal-decode string (make-string (length string) 0)))
-
-;; (defsubst base64-decode-string! (string)
-;; (setq string (string-as-unibyte string))
-;; (base64-internal-decode string string))
-
-(defun base64-internal-decode-region (beg end)
- (save-excursion
- (let ((str (string-as-unibyte (buffer-substring beg end))))
- (delete-region beg end)
- (goto-char beg)
- (insert (base64-internal-decode str str)))))
-
-;; (defun base64-internal-decode-region2 (beg end)
-;; (save-excursion
-;; (let ((str (buffer-substring beg end)))
-;; (delete-region beg end)
-;; (goto-char beg)
-;; (insert (base64-decode-string! str)))))
-
-;; (defun base64-internal-decode-region3 (beg end)
-;; (save-excursion
-;; (let ((str (buffer-substring beg end)))
-;; (delete-region beg end)
-;; (goto-char beg)
-;; (insert (base64-internal-decode-string str)))))
-
-
-;;; @ external encoder/decoder
-;;;
-
-(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)))
-
-
-;;; @ application interfaces
-;;;
-
-(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)))
-
-
-(mel-define-method-function (mime-encode-string string (nil "base64"))
- 'base64-encode-string)
-(mel-define-method-function (mime-decode-string string (nil "base64"))
- 'base64-decode-string)
-(mel-define-method-function (mime-encode-region start end (nil "base64"))
- 'base64-encode-region)
-(mel-define-method-function (mime-decode-region start end (nil "base64"))
- 'base64-decode-region)
-
-(mel-define-method-function (encoded-text-encode-string string (nil "B"))
- 'base64-encode-string)
-
-(mel-define-method encoded-text-decode-string (string (nil "B"))
- (if (and (string-match B-encoded-text-regexp string)
- (string= string (match-string 0 string)))
- (base64-decode-string string)
- (error "Invalid encoded-text %s" string)))
-
-(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: ")))
- (if (and base64-internal-encoding-limit
- (> (nth 7 (file-attributes filename))
- base64-internal-encoding-limit))
- (apply (function call-process) (car base64-external-encoder)
- filename t nil (cdr base64-external-encoder))
- (insert
- (base64-encode-string
- (with-temp-buffer
- (set-buffer-multibyte nil)
- (insert-file-contents-as-binary filename)
- (buffer-string))))
- (or (bolp)
- (insert "\n"))
- ))
-
-(mel-define-method-function (mime-insert-encoded-file filename (nil "base64"))
- 'base64-insert-encoded-file)
-
-(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: ")))
- (if (and base64-internal-decoding-limit
- (> (- end start) base64-internal-decoding-limit))
- (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))))
- (let ((str (buffer-substring start end)))
- (with-temp-buffer
- (insert (base64-internal-decode-string str))
- (write-region-as-binary (point-min) (point-max) filename)
- ))))
-
-(mel-define-method-function
- (mime-write-decoded-region start end filename (nil "base64"))
- 'base64-write-decoded-region)
-
-
-;;; @ etc
-;;;
-
-(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.
projects / elisp / flim.git / commitdiff