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+;;; mule-caesar.el --- ROT 13-47 Caesar rotation utility
+
+;; Copyright (C) 1997,1998 Free Software Foundation, Inc.
+
+;; Author: MORIOKA Tomohiko <morioka@jaist.ac.jp>
+;; Keywords: ROT 13-47, caesar, mail, news, text/x-rot13-47
+
+;; This file is part of APEL (A Portable Emacs Library).
+
+;; This program 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 program 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.
+
+;;; Code:
+
+(defun mule-caesar-region (start end &optional stride-ascii)
+  "Caesar rotation of current region.
+Optional argument STRIDE-ASCII is rotation-size for Latin alphabet
+\(A-Z and a-z).  For non-ASCII text, ROT-N/2 will be performed in any
+case (N=charset-chars; 94 for 94 or 94x94 graphic character set; 96
+for 96 or 96x96 graphic character set)."
+  (interactive "r\nP")
+  (setq stride-ascii (if stride-ascii
+                        (mod stride-ascii 26)
+                      13))
+  (save-excursion
+    (save-restriction
+      (narrow-to-region start end)
+      (goto-char start)
+      (while (< (point)(point-max))
+       (let* ((chr (char-after (point))))
+         (cond ((and (<= ?A chr) (<= chr ?Z))
+                (setq chr (+ chr stride-ascii))
+                (if (> chr ?Z)
+                    (setq chr (- chr 26))
+                  )
+                (delete-char 1)
+                (insert chr)
+                )
+               ((and (<= ?a chr) (<= chr ?z))
+                (setq chr (+ chr stride-ascii))
+                (if (> chr ?z)
+                    (setq chr (- chr 26))
+                  )
+                (delete-char 1)
+                (insert chr)
+                )
+               ((<= chr ?\x9f)
+                (forward-char)
+                )
+               (t
+                (let* ((stride (lsh (charset-chars (char-charset chr)) -1))
+                       (ret (mapcar (function
+                                     (lambda (octet)
+                                       (if (< octet 80)
+                                           (+ octet stride)
+                                         (- octet stride)
+                                         )))
+                                    (cdr (split-char chr)))))
+                  (delete-char 1)
+                  (insert (make-char (char-charset chr)
+                                     (car ret)(car (cdr ret))))
+                  )))
+         )))))
+
+
+(require 'product)
+(product-provide (provide 'mule-caesar) (require 'apel-ver))
+
+;;; mule-caesar.el ends here