| 1 | ;;; -*- coding: iso-2022-7bit; -*- |
| 2 | ;;; tramp-uu.el --- uuencode in Lisp |
| 3 | |
| 4 | ;; Copyright (C) 2002, 2003, 2004, 2005 Free Software Foundation, Inc. |
| 5 | |
| 6 | ;; Author: Kai Gro\e,A_\e(Bjohann <kai.grossjohann@gmx.net> |
| 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., 51 Franklin Street, Fifth Floor, |
| 22 | ;; Boston, MA 02110-1301, 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) |
| 40 | (setq i (1+ i)))) |
| 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. Not counted for length. |
| 67 | (progn (insert "`") (setq len (1- len))) |
| 68 | (insert (tramp-uu-byte-to-uu-char (tramp-uu-b64-char-to-byte c))) |
| 69 | (setq i (1+ i))) |
| 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) |
| 90 | |
| 91 | ;;; arch-tag: 7153f2c6-8be5-4cd2-8c06-0fbcf5190ef6 |
| 92 | ;;; tramp-uu.el ends here |