97 lines
3.0 KiB
EmacsLisp
97 lines
3.0 KiB
EmacsLisp
;;; tramp-uu.el --- uuencode in Lisp -*- lexical-binding:t -*-
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;; Copyright (C) 2002-2024 Free Software Foundation, Inc.
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;; Author: Kai Großjohann <kai.grossjohann@gmx.net>
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;; Maintainer: Michael Albinus <michael.albinus@gmx.de>
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;; Keywords: comm, terminals
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;; Package: tramp
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;; An implementation of "uuencode" in Lisp. Uses the function
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;; base64-encode-region which is built-in to modern Emacs.
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;;; Code:
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(defconst tramp-uu-b64-alphabet
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"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
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"Mapping from base64-encoded character to the byte it represents.")
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(defconst tramp-uu-b64-char-to-byte
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(let ((i 0))
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(mapcar (lambda (c)
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(prog1
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(cons c i)
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(setq i (1+ i))))
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tramp-uu-b64-alphabet))
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"Alist of mapping from base64 character to its byte.")
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(defun tramp-uu-byte-to-uu-char (byte)
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"Return the character encoding BYTE."
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(if (zerop byte) ?` (+ byte 32)))
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(defun tramp-uu-b64-char-to-byte (char)
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"Return the byte that is encoded as CHAR."
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(cdr (assq char tramp-uu-b64-char-to-byte)))
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;;;###tramp-autoload
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(defun tramp-uuencode-region (beg end)
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"UU-encode the region between BEG and END."
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;; First we base64 encode the region, then we transmogrify that into
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;; uu encoding.
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(let ((len (base64-encode-region beg end t))
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i c)
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(save-excursion
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(goto-char beg)
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(setq i 0)
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(while (< i len)
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(setq c (char-after (point)))
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(delete-char 1)
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(if (equal c ?=)
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;; "=" means padding. Insert "`" instead. Not counted for length.
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(progn (insert "`") (setq len (1- len)))
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(insert (tramp-uu-byte-to-uu-char (tramp-uu-b64-char-to-byte c)))
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(setq i (1+ i)))
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;; Every 60 characters, add "M" at beginning of line (as
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;; length byte) and insert a newline.
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(when (zerop (% i 60))
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(save-excursion
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(beginning-of-line)
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(insert (char-to-string (+ 32 (/ (* 3 60) 4)))))
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(insert "\n")))
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;; If there is something leftover, we compute the length byte
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;; for that stuff and insert it and a trailing newline.
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(unless (zerop (% i 60))
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(save-excursion
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(beginning-of-line)
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(insert (char-to-string (+ 32 (% (- end beg) 45)))))
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(insert "\n"))
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;; Why is there always a "`" line at the end?
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(insert "`\nend\n")
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(goto-char beg)
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(insert "begin 600 xxx\n"))))
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(add-hook 'tramp-unload-hook
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(lambda ()
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(unload-feature 'tramp-uu 'force)))
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(provide 'tramp-uu)
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;;; tramp-uu.el ends here
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