[bpt/emacs.git] / lisp / net / tramp-uu.el

;;; -*- coding: iso-2022-7bit; -*-
;;; tramp-uu.el --- uuencode in Lisp

;; Copyright (C) 2002  Free Software Foundation, Inc.

;; Author: Kai Gro\e,A_\e(Bjohann <Kai.Grossjohann@CS.Uni-Dortmund.DE>
;; Keywords: comm, terminals

;; This file 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 file 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.

;;; Commentary:

;; An implementation of "uuencode" in Lisp.  Uses the function
;; base64-encode-region which is built-in to modern Emacsen.

;;; Code:

(defvar tramp-uu-b64-alphabet
  "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
  "Mapping from base64-encoded character to the byte it represents.")

(defvar tramp-uu-b64-char-to-byte
  (let ((i 0))
    (mapcar (lambda (c)
	      (prog1
		  (cons c i)
		(setq i (1+ i))))
	    tramp-uu-b64-alphabet))
  "Alist of mapping from base64 character to its byte.")

(defun tramp-uu-byte-to-uu-char (byte)
  "Return the character encoding BYTE."
  (if (zerop byte) ?` (+ byte 32)))

(defun tramp-uu-b64-char-to-byte (char)
  "Return the byte that is encoded as CHAR."
  (cdr (assq char tramp-uu-b64-char-to-byte)))

(defun tramp-uuencode-region (beg end)
  "UU-encode the region between BEG and END."
  ;; First we base64 encode the region, then we transmogrify that into
  ;; uu encoding.
  (let ((len (base64-encode-region beg end t))
	(padding 0)
	i c)
    (save-excursion
      (goto-char beg)
      (setq i 0)
      (while (< i len)
	(setq c (char-after (point)))
	(delete-char 1)
	(if (equal c ?=)
	    ;; "=" means padding.  Insert "`" instead.
	    (insert "`")
	  (insert (tramp-uu-byte-to-uu-char (tramp-uu-b64-char-to-byte c))))
	(setq i (1+ i))
	;; Every 60 characters, add "M" at beginning of line (as
	;; length byte) and insert a newline.
	(when (zerop (% i 60))
	  (save-excursion
	    (beginning-of-line)
	    (insert (char-to-string (+ 32 (/ (* 3 60) 4)))))
	  (insert "\n")))
      ;; If there is something leftover, we compute the length byte
      ;; for that stuff and insert it and a trailing newline.
      (unless (zerop (% i 60))
	(save-excursion
	  (beginning-of-line)
	  (insert (char-to-string (+ 32 (% (- end beg) 45)))))
	(insert "\n"))
      ;; Why is there always a "`" line at the end?
      (insert "`\nend\n")
      (goto-char beg)
      (insert "begin 600 xxx\n"))))

(provide 'tramp-uu)

;;; arch-tag: 7153f2c6-8be5-4cd2-8c06-0fbcf5190ef6
;;; tramp-uu.el ends here
Commit	Line	Data
ea9d1443	1	;;; -- coding: iso-2022-7bit; --
16674e4f KG	2	;;; tramp-uu.el --- uuencode in Lisp
	3
	4	;; Copyright (C) 2002 Free Software Foundation, Inc.
	5
ea9d1443	6	;; Author: Kai Gro\e,A_\e(Bjohann <Kai.Grossjohann@CS.Uni-Dortmund.DE>
16674e4f KG	7	;; Keywords: comm, terminals
	8
	9	;; This file is free software; you can redistribute it and/or modify
	10	;; it under the terms of the GNU General Public License as published by
	11	;; the Free Software Foundation; either version 2, or (at your option)
	12	;; any later version.
	13
	14	;; This file is distributed in the hope that it will be useful,
	15	;; but WITHOUT ANY WARRANTY; without even the implied warranty of
	16	;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	17	;; GNU General Public License for more details.
	18
	19	;; You should have received a copy of the GNU General Public License
	20	;; along with GNU Emacs; see the file COPYING. If not, write to
	21	;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
	22	;; Boston, MA 02111-1307, USA.
	23
	24	;;; Commentary:
	25
	26	;; An implementation of "uuencode" in Lisp. Uses the function
	27	;; base64-encode-region which is built-in to modern Emacsen.
	28
	29	;;; Code:
	30
	31	(defvar tramp-uu-b64-alphabet
	32	"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
	33	"Mapping from base64-encoded character to the byte it represents.")
	34
	35	(defvar tramp-uu-b64-char-to-byte
	36	(let ((i 0))
	37	(mapcar (lambda (c)
	38	(prog1
	39	(cons c i)
4007ba5b	40	(setq i (1+ i))))
16674e4f KG	41	tramp-uu-b64-alphabet))
	42	"Alist of mapping from base64 character to its byte.")
	43
	44	(defun tramp-uu-byte-to-uu-char (byte)
	45	"Return the character encoding BYTE."
	46	(if (zerop byte) ?` (+ byte 32)))
	47
	48	(defun tramp-uu-b64-char-to-byte (char)
	49	"Return the byte that is encoded as CHAR."
	50	(cdr (assq char tramp-uu-b64-char-to-byte)))
	51
	52	(defun tramp-uuencode-region (beg end)
	53	"UU-encode the region between BEG and END."
	54	;; First we base64 encode the region, then we transmogrify that into
	55	;; uu encoding.
	56	(let ((len (base64-encode-region beg end t))
	57	(padding 0)
	58	i c)
	59	(save-excursion
	60	(goto-char beg)
	61	(setq i 0)
	62	(while (< i len)
	63	(setq c (char-after (point)))
	64	(delete-char 1)
	65	(if (equal c ?=)
	66	;; "=" means padding. Insert "`" instead.
	67	(insert "`")
	68	(insert (tramp-uu-byte-to-uu-char (tramp-uu-b64-char-to-byte c))))
4007ba5b	69	(setq i (1+ i))
16674e4f KG	70	;; Every 60 characters, add "M" at beginning of line (as
	71	;; length byte) and insert a newline.
	72	(when (zerop (% i 60))
	73	(save-excursion
	74	(beginning-of-line)
	75	(insert (char-to-string (+ 32 (/ (* 3 60) 4)))))
	76	(insert "\n")))
	77	;; If there is something leftover, we compute the length byte
	78	;; for that stuff and insert it and a trailing newline.
	79	(unless (zerop (% i 60))
	80	(save-excursion
	81	(beginning-of-line)
	82	(insert (char-to-string (+ 32 (% (- end beg) 45)))))
	83	(insert "\n"))
	84	;; Why is there always a "`" line at the end?
	85	(insert "`\nend\n")
	86	(goto-char beg)
	87	(insert "begin 600 xxx\n"))))
	88
	89	(provide 'tramp-uu)
6b61353c KH	90
6b61353c KH	91	;;; arch-tag: 7153f2c6-8be5-4cd2-8c06-0fbcf5190ef6
16674e4f	92	;;; tramp-uu.el ends here