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;;; base64.el,v --- Base64 encoding functions
;; Author: Kyle E. Jones
;; Created: 1997/03/12 14:37:09
;; Version: 1.6
;; Keywords: extensions
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;; Copyright (C) 1997 Kyle E. Jones
;;;
;;; This file is not part of GNU Emacs, but the same permissions apply.
;;;
;;; GNU Emacs 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.
;;;
;;; GNU Emacs 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.
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(require 'poe)
;; For non-MULE
(if (not (fboundp 'char-int))
(fset 'char-int 'identity))
(defvar base64-alphabet
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/")
(defvar base64-decoder-program nil
"*Non-nil value should be a string that names a MIME base64 decoder.
The program should expect to read base64 data on its standard
input and write the converted data to its standard output.")
(defvar base64-decoder-switches nil
"*List of command line flags passed to the command named by
base64-decoder-program.")
(defvar base64-encoder-program nil
"*Non-nil value should be a string that names a MIME base64 encoder.
The program should expect arbitrary data on its standard
input and write base64 data to its standard output.")
(defvar base64-encoder-switches nil
"*List of command line flags passed to the command named by
base64-encoder-program.")
(defconst base64-alphabet-decoding-alist
'(
( ?A . 00) ( ?B . 01) ( ?C . 02) ( ?D . 03) ( ?E . 04) ( ?F . 05)
( ?G . 06) ( ?H . 07) ( ?I . 08) ( ?J . 09) ( ?K . 10) ( ?L . 11)
( ?M . 12) ( ?N . 13) ( ?O . 14) ( ?P . 15) ( ?Q . 16) ( ?R . 17)
( ?S . 18) ( ?T . 19) ( ?U . 20) ( ?V . 21) ( ?W . 22) ( ?X . 23)
( ?Y . 24) ( ?Z . 25) ( ?a . 26) ( ?b . 27) ( ?c . 28) ( ?d . 29)
( ?e . 30) ( ?f . 31) ( ?g . 32) ( ?h . 33) ( ?i . 34) ( ?j . 35)
( ?k . 36) ( ?l . 37) ( ?m . 38) ( ?n . 39) ( ?o . 40) ( ?p . 41)
( ?q . 42) ( ?r . 43) ( ?s . 44) ( ?t . 45) ( ?u . 46) ( ?v . 47)
( ?w . 48) ( ?x . 49) ( ?y . 50) ( ?z . 51) ( ?0 . 52) ( ?1 . 53)
( ?2 . 54) ( ?3 . 55) ( ?4 . 56) ( ?5 . 57) ( ?6 . 58) ( ?7 . 59)
( ?8 . 60) ( ?9 . 61) ( ?+ . 62) ( ?/ . 63)
))
(defvar base64-alphabet-decoding-vector
(let ((v (make-vector 123 nil))
(p base64-alphabet-decoding-alist))
(while p
(aset v (car (car p)) (cdr (car p)))
(setq p (cdr p)))
v))
(defvar base64-binary-coding-system 'binary)
(defun base64-run-command-on-region (start end output-buffer command
&rest arg-list)
(let ((tempfile nil) status errstring default-process-coding-system
(coding-system-for-write base64-binary-coding-system)
(coding-system-for-read base64-binary-coding-system))
(unwind-protect
(progn
(setq tempfile (make-temp-name "base64"))
(setq status
(apply 'call-process-region
start end command nil
(list output-buffer tempfile)
nil arg-list))
(cond ((equal status 0) t)
((zerop (save-excursion
(set-buffer (find-file-noselect tempfile))
(buffer-size)))
t)
(t (save-excursion
(set-buffer (find-file-noselect tempfile))
(setq errstring (buffer-string))
(kill-buffer nil)
(cons status errstring)))))
(ignore-errors
(delete-file tempfile)))))
(if (string-match "XEmacs" emacs-version)
(defalias 'base64-insert-char 'insert-char)
(defun base64-insert-char (char &optional count ignored buffer)
(if (or (null buffer) (eq buffer (current-buffer)))
(insert-char char count)
(with-current-buffer buffer
(insert-char char count))))
(setq base64-binary-coding-system 'raw-text))
(defun-maybe base64-decode-region (start end)
(interactive "r")
;;(message "Decoding base64...")
(let ((work-buffer nil)
(done nil)
(counter 0)
(bits 0)
(lim 0) inputpos
(non-data-chars (concat "^=" base64-alphabet)))
(unwind-protect
(save-excursion
(setq work-buffer (generate-new-buffer " *base64-work*"))
(buffer-disable-undo work-buffer)
(if base64-decoder-program
(let* ((binary-process-output t) ; any text already has CRLFs
(status (apply 'base64-run-command-on-region
start end work-buffer
base64-decoder-program
base64-decoder-switches)))
(if (not (eq status t))
(error "%s" (cdr status))))
(goto-char start)
(skip-chars-forward non-data-chars end)
(while (not done)
(setq inputpos (point))
(cond
((> (skip-chars-forward base64-alphabet end) 0)
(setq lim (point))
(while (< inputpos lim)
(setq bits (+ bits
(aref base64-alphabet-decoding-vector
(char-int (char-after inputpos)))))
(setq counter (1+ counter)
inputpos (1+ inputpos))
(cond ((= counter 4)
(base64-insert-char (lsh bits -16) 1 nil work-buffer)
(base64-insert-char (logand (lsh bits -8) 255) 1 nil
work-buffer)
(base64-insert-char (logand bits 255) 1 nil
work-buffer)
(setq bits 0 counter 0))
(t (setq bits (lsh bits 6)))))))
(cond
((= (point) end)
(if (not (zerop counter))
(error "at least %d bits missing at end of base64 encoding"
(* (- 4 counter) 6)))
(setq done t))
((eq (char-after (point)) ?=)
(setq done t)
(cond ((= counter 1)
(error "at least 2 bits missing at end of base64 encoding"))
((= counter 2)
(base64-insert-char (lsh bits -10) 1 nil work-buffer))
((= counter 3)
(base64-insert-char (lsh bits -16) 1 nil work-buffer)
(base64-insert-char (logand (lsh bits -8) 255)
1 nil work-buffer))
((= counter 0) t)))
(t (skip-chars-forward non-data-chars end)))))
(or (markerp end) (setq end (set-marker (make-marker) end)))
(goto-char start)
(insert-buffer-substring work-buffer)
(delete-region (point) end))
(and work-buffer (kill-buffer work-buffer))))
;;(message "Decoding base64... done")
)
(defun-maybe base64-encode-region (start end &optional no-line-break)
(interactive "r")
(message "Encoding base64...")
(let ((work-buffer nil)
(counter 0)
(cols 0)
(bits 0)
(alphabet base64-alphabet)
inputpos)
(unwind-protect
(save-excursion
(setq work-buffer (generate-new-buffer " *base64-work*"))
(buffer-disable-undo work-buffer)
(if base64-encoder-program
(let ((status (apply 'base64-run-command-on-region
start end work-buffer
base64-encoder-program
base64-encoder-switches)))
(if (not (eq status t))
(error "%s" (cdr status))))
(setq inputpos start)
(while (< inputpos end)
(setq bits (+ bits (char-int (char-after inputpos))))
(setq counter (1+ counter))
(cond ((= counter 3)
(base64-insert-char (aref alphabet (lsh bits -18)) 1 nil
work-buffer)
(base64-insert-char
(aref alphabet (logand (lsh bits -12) 63))
1 nil work-buffer)
(base64-insert-char
(aref alphabet (logand (lsh bits -6) 63))
1 nil work-buffer)
(base64-insert-char
(aref alphabet (logand bits 63))
1 nil work-buffer)
(setq cols (+ cols 4))
(cond ((and (= cols 72)
(not no-line-break))
(base64-insert-char ?\n 1 nil work-buffer)
(setq cols 0)))
(setq bits 0 counter 0))
(t (setq bits (lsh bits 8))))
(setq inputpos (1+ inputpos)))
;; write out any remaining bits with appropriate padding
(if (= counter 0)
nil
(setq bits (lsh bits (- 16 (* 8 counter))))
(base64-insert-char (aref alphabet (lsh bits -18)) 1 nil
work-buffer)
(base64-insert-char (aref alphabet (logand (lsh bits -12) 63))
1 nil work-buffer)
(if (= counter 1)
(base64-insert-char ?= 2 nil work-buffer)
(base64-insert-char (aref alphabet (logand (lsh bits -6) 63))
1 nil work-buffer)
(base64-insert-char ?= 1 nil work-buffer)))
(if (and (> cols 0)
(not no-line-break))
(base64-insert-char ?\n 1 nil work-buffer)))
(or (markerp end) (setq end (set-marker (make-marker) end)))
(goto-char start)
(insert-buffer-substring work-buffer)
(delete-region (point) end))
(and work-buffer (kill-buffer work-buffer))))
(message "Encoding base64... done"))
(defun base64-encode (string)
(save-excursion
(set-buffer (get-buffer-create " *base64-encode*"))
(erase-buffer)
(insert string)
(base64-encode-region (point-min) (point-max))
(skip-chars-backward " \t\r\n")
(delete-region (point-max) (point))
(prog1
(buffer-string)
(kill-buffer (current-buffer)))))
(defun base64-decode (string)
(save-excursion
(set-buffer (get-buffer-create " *base64-decode*"))
(erase-buffer)
(insert string)
(base64-decode-region (point-min) (point-max))
(goto-char (point-max))
(skip-chars-backward " \t\r\n")
(delete-region (point-max) (point))
(prog1
(buffer-string)
(kill-buffer (current-buffer)))))
(fset 'base64-decode-string 'base64-decode)
(provide 'base64)
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