mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-11-24 07:20:37 +00:00
93 lines
3.0 KiB
EmacsLisp
93 lines
3.0 KiB
EmacsLisp
;;; -*- coding: iso-2022-7bit; -*-
|
||
;;; tramp-uu.el --- uuencode in Lisp
|
||
|
||
;; Copyright (C) 2002, 2004 Free Software Foundation, Inc.
|
||
|
||
;; Author: Kai Gro,A_(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. Not counted for length.
|
||
(progn (insert "`") (setq len (1- len)))
|
||
(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
|