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diff --git a/lisp/obsolete/uncompress.el b/lisp/obsolete/uncompress.el
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+;;; uncompress.el --- auto-decompression hook for visiting .Z files
+
+;; Copyright (C) 1992, 1994, 2001 Free Software Foundation, Inc.
+
+;; Maintainer: FSF
+;; Keywords: files
+
+;; 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 2, 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; see the file COPYING.  If not, write to the
+;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
+
+;;; Commentary:
+
+;; This package can be used to arrange for automatic uncompress of
+;; compressed files when they are visited.
+;; All that's necessary is to load it.  This can conveniently be done from
+;; your .emacs file.
+
+;; M-x auto-compression-mode is a more modern replacement for this package.
+
+;;; Code:
+
+;; When we are about to make a backup file,
+;; uncompress the file we visited
+;; so that making the backup can work properly.
+;; This is used as a write-file-hook.
+
+(defvar uncompress-program "gunzip"
+  "Program to use for uncompression.")
+
+(defun uncompress-backup-file ()
+  (and buffer-file-name make-backup-files (not buffer-backed-up)
+       (not (file-exists-p buffer-file-name))
+       (call-process uncompress-program nil nil nil buffer-file-name))
+  nil)
+
+(or (assoc "\\.Z$" auto-mode-alist)
+    (setq auto-mode-alist
+          (cons '("\\.Z$" . uncompress-while-visiting) auto-mode-alist)))
+(or (assoc "\\.gz$" auto-mode-alist)
+    (setq auto-mode-alist
+          (cons '("\\.gz$" . uncompress-while-visiting) auto-mode-alist)))
+(or (assoc "\\.tgz$" auto-mode-alist)
+    (setq auto-mode-alist
+          (cons '("\\.tgz$" . uncompress-while-visiting) auto-mode-alist)))
+
+(defun uncompress-while-visiting ()
+  "Temporary \"major mode\" used for .Z and .gz files, to uncompress them.
+It then selects a major mode from the uncompressed file name and contents."
+  (if (and (not (null buffer-file-name))
+           (string-match "\\.Z$" buffer-file-name))
+      (set-visited-file-name
+       (substring buffer-file-name 0 (match-beginning 0)))
+    (if (and (not (null buffer-file-name))
+             (string-match "\\.gz$" buffer-file-name))
+        (set-visited-file-name
+         (substring buffer-file-name 0 (match-beginning 0)))
+      (if (and (not (null buffer-file-name))
+               (string-match "\\.tgz$" buffer-file-name))
+          (set-visited-file-name
+           (concat (substring buffer-file-name 0 (match-beginning 0)) ".tar")))))
+  (message "Uncompressing...")
+  (let ((buffer-read-only nil)
+        (coding-system-for-write 'no-conversion)
+        (coding-system-for-read
+         (car (find-operation-coding-system
+               'insert-file-contents
+               buffer-file-name t))))
+    (shell-command-on-region (point-min) (point-max) uncompress-program t))
+  (goto-char (point-min))
+  (message "Uncompressing...done")
+  (set-buffer-modified-p nil)
+  (make-local-variable 'write-file-hooks)
+  (or (memq 'uncompress-backup-file write-file-hooks)
+      (setq write-file-hooks (cons 'uncompress-backup-file write-file-hooks)))
+  (normal-mode))
+
+(or (memq 'find-compressed-version find-file-not-found-hooks)
+    (setq find-file-not-found-hooks
+          (cons 'find-compressed-version find-file-not-found-hooks)))
+
+(defun find-compressed-version ()
+  "Hook to read and uncompress the compressed version of a file."
+  ;; Just pretend we had visited the compressed file,
+  ;; and uncompress-while-visiting will do the rest.
+  (let (name)
+    (if (file-exists-p (setq name (concat buffer-file-name ".Z")))
+        (setq buffer-file-name name)
+      (if (file-exists-p (setq name (concat buffer-file-name ".gz")))
+          (setq buffer-file-name name)))
+    (if (eq name buffer-file-name)
+        (progn
+          (insert-file-contents buffer-file-name t)
+          (goto-char (point-min))
+          ;; No need for this, because error won't be set to t
+          ;; if this function returns t.
+          ;; (setq error nil)
+          t))))
+
+(provide 'uncompress)
+
+;;; uncompress.el ends here