mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-11-30 08:09:04 +00:00
97 lines
3.0 KiB
EmacsLisp
97 lines
3.0 KiB
EmacsLisp
;;; tramp-uu.el --- uuencode in Lisp -*- lexical-binding:t -*-
|
|
|
|
;; Copyright (C) 2002-2022 Free Software Foundation, Inc.
|
|
|
|
;; Author: Kai Großjohann <kai.grossjohann@gmx.net>
|
|
;; Maintainer: Michael Albinus <michael.albinus@gmx.de>
|
|
;; Keywords: comm, terminals
|
|
;; Package: tramp
|
|
|
|
;; This file is part of GNU Emacs.
|
|
|
|
;; 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 3 of the License, 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. If not, see <https://www.gnu.org/licenses/>.
|
|
|
|
;;; Commentary:
|
|
|
|
;; An implementation of "uuencode" in Lisp. Uses the function
|
|
;; base64-encode-region which is built-in to modern Emacsen.
|
|
|
|
;;; Code:
|
|
|
|
(defconst tramp-uu-b64-alphabet
|
|
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
|
|
"Mapping from base64-encoded character to the byte it represents.")
|
|
|
|
(defconst 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)))
|
|
|
|
;;;###tramp-autoload
|
|
(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))
|
|
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"))))
|
|
|
|
(add-hook 'tramp-unload-hook
|
|
(lambda ()
|
|
(unload-feature 'tramp-uu 'force)))
|
|
|
|
(provide 'tramp-uu)
|
|
|
|
;;; tramp-uu.el ends here
|