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+;;; arc-mode.el --- simple editing of archives
+
+;;; Copyright (C) 1995 Free Software Foundation, Inc.
+
+;; Author: Morten Welinder (terra@diku.dk)
+;; Version: 0,31
+;; Keywords: archives msdog editing major-mode
+;; Favourite-brand-of-beer: None, I hate beer.
+
+;;; 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, 675 Mass Ave, Cambridge, MA 02139, USA.
+
+;;; Commentary:
+;;
+;; NAMING: "arc" is short for "archive" and does not refer specifically
+;; to files whose name end in ".arc"
+;;
+;; This code does not decode any files internally, although it does
+;; understand the directory level of the archives.  For this reason,
+;; you should expect this code to need more fiddling than tar-mode.el
+;; (although it at present has fewer bugs :-)  In particular, I have
+;; not tested this under Ms-Dog myself.
+;; -------------------------------------
+;; INTERACTION: arc-mode.el should play together with
+;;
+;; * ange-ftp.el: Remote archives (i.e., ones that ange-ftp has brought
+;;                to you) are handled by doing all updates on a local
+;;                copy.  When you make changes to a remote file the
+;;                changes will first take effect when the archive buffer
+;;                is saved.  You will be warned about this.
+;;
+;; * dos-fns.el:  (Part of Emacs 19).  You get automatic ^M^J <--> ^J
+;;                conversion.
+;;
+;; arc-mode.el does not work well with crypt++.el; for the archives as
+;; such this could be fixed (but wouldn't be useful) by declaring such
+;; archives to be "remote".  For the members this is a general Emacs
+;; problem that 19.29's file formats may fix.
+;; -------------------------------------
+;; ARCHIVE TYPES: Currently only the archives below are handled, but the
+;; structure for handling just about anything is in place.
+;;
+;;                        Arc     Lzh     Zip     Zoo
+;;                        --------------------------------
+;; View listing           Intern  Intern  Intern  Intern
+;; Extract member         Y       Y       Y       Y
+;; Save changed member    Y       Y       Y       Y
+;; Add new member         N       N       N       N
+;; Delete member          Y       Y       Y       Y
+;; Rename member          Y       Y       N       N
+;; Chmod                  -       Y       Y       -
+;; Chown                  -       Y       -       -
+;; Chgrp                  -       Y       -       -
+;;
+;; Special thanks to Bill Brodie <wbrodie@panix.com> for very useful tips
+;; on the first released version of this package.
+;;
+;; This code is partly based on tar-mode.el from Emacs.
+;; -------------------------------------
+;; ARCHIVE STRUCTURES:
+;; (This is mostly for myself.)
+;;
+;; ARC         A series of (header,file).  No interactions among members.
+;;
+;; LZH         A series of (header,file).  Headers are checksummed.  No
+;;             interaction among members.
+;;
+;; ZIP         A series of (lheader,fil) followed by a "central directory"
+;;             which is a series of (cheader) followed by an end-of-
+;;             central-dir record possibly followed by junk.  The e-o-c-d
+;;             links to c-d.  cheaders link to lheaders which are basically
+;;             cut-down versions of the cheaders.
+;;
+;; ZOO         An archive header followed by a series of (header,file).
+;;             Each member header points to the next.  The archive is
+;;             terminated by a bogus header with a zero next link.
+;; -------------------------------------
+;; SETUP: .emacs fodder:
+;;
+;; (setq auto-mode-alist
+;;       (cons '("\\.\\(arc\\|zip\\|lzh\\|zoo\\)\\'" . archive-mode)
+;;             auto-mode-alist))
+;; (autoload 'archive-mode "arc-mode" "Major mode for editing archives." t)
+;;
+;; Furthermore, for msdog, you need to make sure that the archives are loaded
+;; as binary files.  For arc/zip/pak/lzh/zoo this is the default.
+;; -------------------------------------
+;; HOOKS: `foo' means one the the supported archive types.
+;;
+;; archive-mode-hook
+;; archive-foo-mode-hook
+;; archive-extract-hooks
+
+;;; Code:
+
+;; -------------------------------------------------------------------------
+;; Section: Configuration.
+
+(defvar archive-dos-members t
+  "*If non-nil then recognize member files using ^M^J as line terminator
+and do The Right Thing.")
+
+(defvar archive-tmpdir
+  (expand-file-name
+   (make-temp-name (if (eq system-type 'ms-dos) "ar" "archive.tmp"))
+   (or (getenv "TMPDIR") (getenv "TMP") "/tmp"))
+  "*Directory for temporary files made by arc-mode.el")
+
+(defvar archive-remote-regexp "^/[^/:]*[^/:]:"
+  "*Regexp recognizing archive files names that are not local (i.e., are
+not proper file names outside Emacs).  A local copy a the archive will
+be used when updating.")
+
+(defvar archive-extract-hooks nil
+  "*Hooks to run when an archive member has been extracted.")
+;; ------------------------------
+;; Arc archive configuration
+
+;; We always go via a local file since there seems to be no reliable way
+;; to extract to stdout without junk getting added.
+(defvar archive-arc-extract
+  '("arc" "x")
+  "*Program and its options to run in order to extract an arc file member
+to the current directory.  Archive and member name will be added.")
+
+(defvar archive-arc-expunge
+  '("arc" "d")
+  "*Program and its options to run in order to delete arc file members.
+Archive and member names will be added.")
+
+(defvar archive-arc-write-file-member
+  '("arc" "u")
+  "*Program and its options to run in order to update an arc file member.
+Archive and member name will be added.")
+;; ------------------------------
+;; Lzh archive configuration
+
+(defvar archive-lzh-extract
+  '("lha" "pq")
+  "*Program and its options to run in order to extract an lzh file member
+to standard output.  Archive and member name will be added.")
+
+(defvar archive-lzh-expunge
+  '("lha" "d")
+  "*Program and its options to run in order to delete lzh file members.
+Archive and member names will be added.")
+
+(defvar archive-lzh-write-file-member
+  '("lha" "a")
+  "*Program and its options to run in order to update an lzh file member.
+Archive and member name will be added.")
+;; ------------------------------
+;; Zip archive configuration
+
+(defvar archive-zip-use-pkzip (memq system-type '(ms-dos windows-nt))
+  "*If non-nil then all zip options default to values suitable when using
+pkzip and pkunzip.  Only set to true for msdog systems!")
+
+(defvar archive-zip-extract
+  (if archive-zip-use-pkzip '("pkunzip" "-e") '("unzip" "-qq" "-c"))
+  "*Program and its options to run in order to extract a zip file member
+to standard output.  Archive and member name will be added.\n
+If `archive-zip-use-pkzip' is non-nil then this program is expected to
+extract to a file junking the directory part of the name.")
+
+;; For several reasons the latter behaviour is not desireable in general.
+;; (1) It uses more disk space.  (2) Error checking is worse or non-
+;; existent.  (3) It tends to do funny things with other systems' file
+;; names.
+
+(defvar archive-zip-expunge
+  (if archive-zip-use-pkzip '("pkzip" "-d") '("zip" "-d" "-q"))
+  "*Program and its options to run in order to delete zip file members.
+Archive and member names will be added.")
+
+(defvar archive-zip-update
+  (if archive-zip-use-pkzip '("pkzip" "-u") '("zip" "-q"))
+  "*Program and its options to run in order to update a zip file member.
+Options should ensure that specified directory will be put into the zip
+file.  Archive and member name will be added.")
+
+(defvar archive-zip-update-case
+  (if archive-zip-use-pkzip archive-zip-update '("zip" "-q" "-k"))
+  "*Program and its options to run in order to update a case fiddled
+zip file member.  Options should ensure that specified directory will
+be put into the zip file.  Archive and member name will be added.")
+
+(defvar archive-zip-case-fiddle t
+  "*If non-nil then zip file members are mapped to lower case if created
+by a system that under single case file names.")
+;; ------------------------------
+;; Zoo archive configuration
+
+(defvar archive-zoo-extract
+  '("zoo" "xpq")
+  "*Program and its options to run in order to extract a zoo file member
+to standard output.  Archive and member name will be added.")
+
+(defvar archive-zoo-expunge
+  '("zoo" "DqPP")
+  "*Program and its options to run in order to delete zoo file members.
+Archive and member names will be added.")
+
+(defvar archive-zoo-write-file-member
+  '("zoo" "a")
+  "*Program and its options to run in order to update a zoo file member.
+Archive and member name will be added.")
+;; -------------------------------------------------------------------------
+;; Section: Variables
+
+(defvar archive-subtype nil "*Symbol describing archive type.")
+(defvar archive-file-list-start nil "*Position of first contents line.")
+(defvar archive-file-list-end nil "*Position just after last contents line.")
+(defvar archive-proper-file-start nil "*Position of real archive's start.")
+(defvar archive-read-only nil "*Non-nil if the archive is read-only on disk.")
+(defvar archive-remote nil "*Non-nil if the archive is outside file system.")
+(defvar archive-local-name nil "*Name of local copy of remote archive.")
+(defvar archive-mode-map nil "*Local keymap for archive mode listings.")
+(defvar archive-file-name-indent nil "*Column where file names start.")
+
+(defvar archive-alternate-display nil
+  "*Non-nil when alternate information is shown.")
+(make-variable-buffer-local 'archive-alternate-display)
+(put 'archive-alternate-display 'permanent-local t)
+
+(defvar archive-superior-buffer nil "*In archive members, points to archive.")
+(put 'archive-superior-buffer 'permanent-local t)
+
+(defvar archive-subfile-mode nil "*Non-nil in archive member buffers.")
+(make-variable-buffer-local 'archive-subfile-mode)
+(put 'archive-subfile-mode 'permanent-local t)
+
+;; buffer-file-type is a per-buffer variable in the msdog configuration
+(if (boundp 'buffer-file-type) nil
+  (defvar buffer-file-type nil
+    "*Nil for dos-style text file, non-nil otherwise.")
+  (make-variable-buffer-local 'buffer-file-type)
+  (put 'buffer-file-type 'permanent-local t)
+  (setq-default buffer-file-type nil))
+
+(defvar archive-subfile-dos nil
+  "Negation of `buffer-file-type' which see.")
+(make-variable-buffer-local 'archive-subfile-dos)
+(put 'archive-subfile-dos 'permanent-local t)
+
+(defvar archive-files nil "Vector of file descriptors.  Each descriptor is
+a vector of [ext-file-name int-file-name case-fiddled mode ...]")
+(make-variable-buffer-local 'archive-files)
+;; -------------------------------------------------------------------------
+;; Section: Support functions.
+
+(defsubst archive-name (suffix)
+  (intern (concat "archive-" (symbol-name archive-subtype) "-" suffix)))
+
+(defun archive-l-e (str &optional len)
+  "Convert little endian string/vector to integer.  Alternatively, first
+argument may be a buffer position in the current buffer in which case a
+second arguemnt, length, should be supplied."
+  (if (stringp str)
+      (setq len (length str))
+    (setq str (buffer-substring str (+ str len))))
+  (let ((result 0)
+        (i 0))
+    (while (< i len)
+      (setq i (1+ i)
+            result (+ (ash result 8) (aref str (- len i)))))
+    result))
+
+(defun archive-int-to-mode (mode)
+  "Turn an integer like 0700 (i.e., 448) into a mode string like -rwx------"
+  (let ((str (make-string 10 ?-)))
+    (or (zerop (logand 16384 mode)) (aset str 0 ?d))
+    (or (zerop (logand  8192 mode)) (aset str 0 ?c)) ; completeness
+    (or (zerop (logand   256 mode)) (aset str 1 ?r))
+    (or (zerop (logand   128 mode)) (aset str 2 ?w))
+    (or (zerop (logand    64 mode)) (aset str 3 ?x))
+    (or (zerop (logand    32 mode)) (aset str 4 ?r))
+    (or (zerop (logand    16 mode)) (aset str 5 ?w))
+    (or (zerop (logand     8 mode)) (aset str 6 ?x))
+    (or (zerop (logand     4 mode)) (aset str 7 ?r))
+    (or (zerop (logand     2 mode)) (aset str 8 ?w))
+    (or (zerop (logand     1 mode)) (aset str 9 ?x))
+    (or (zerop (logand  1024 mode)) (aset str 3 (if (zerop (logand 64 mode))
+                                                    ?S ?s)))
+    (or (zerop (logand  2048 mode)) (aset str 6 (if (zerop (logand  8 mode))
+                                                    ?S ?s)))
+    str))
+
+(defun archive-calc-mode (oldmode newmode &optional error)
+  "From the integer OLDMODE and the string NEWMODE calculate a new file
+mode.\n
+NEWMODE may be an octal number including a leading zero in which case it
+will become the new mode.\n
+NEWMODE may also be a relative specification like \"og-rwx\" in which case
+OLDMODE will be modified accordingly just like chmod(2) would have done.\n
+If optional third argument ERROR is non-nil an error will be signaled if
+the mode is invalid.  If ERROR is nil then nil will be returned."
+  (cond ((string-match "^0[0-7]*$" newmode)
+         (let ((result 0)
+               (len (length newmode))
+               (i 1))
+           (while (< i len)
+             (setq result (+ (lsh result 3) (aref newmode i) (- ?0))
+                   i (1+ i)))
+           (logior (logand oldmode 65024) result)))
+        ((string-match "^\\([agou]+\\)\\([---+=]\\)\\([rwxst]+\\)$" newmode)
+         (let ((who 0)
+               (result oldmode)
+               (op (aref newmode (match-beginning 2)))
+               (bits 0)
+               (i (match-beginning 3)))
+           (while (< i (match-end 3))
+             (let ((rwx (aref newmode i)))
+               (setq bits (logior bits (cond ((= rwx ?r)  292)
+                                             ((= rwx ?w)  146)
+                                             ((= rwx ?x)   73)
+                                             ((= rwx ?s) 3072)
+                                             ((= rwx ?t)  512)))
+                     i (1+ i))))
+           (while (< who (match-end 1))
+             (let* ((whoc (aref newmode who))
+                    (whomask (cond ((= whoc ?a) 4095)
+                                   ((= whoc ?u) 1472)
+                                   ((= whoc ?g) 2104)
+                                   ((= whoc ?o)    7))))
+               (if (= op ?=)
+                   (setq result (logand result (lognot whomask))))
+               (if (= op ?-)
+                   (setq result (logand result (lognot (logand whomask bits))))
+                 (setq result (logior result (logand whomask bits)))))
+             (setq who (1+ who)))
+           result))
+        (t
+         (if error
+             (error "Invalid mode specification: %s" newmode)))))
+
+(defun archive-dosdate (date)
+  "Stringify dos packed DATE record."
+  (let ((year (+ 1980 (logand (ash date -9) 127)))
+        (month (logand (ash date -5) 15))
+        (day (logand date 31)))
+    (if (or (> month 12) (< month 1))
+        ""
+      (format "%2d-%s-%d"
+              day
+              (aref ["Jan" "Feb" "Mar" "Apr" "May" "Jun"
+                     "Jul" "Aug" "Sep" "Oct" "Nov" "Dec"] (1- month))
+              year))))
+
+(defun archive-dostime (time)
+  "Stringify dos packed TIME record."
+  (let ((hour (logand (ash time -11) 31))
+        (minute (logand (ash time -5) 53))
+        (second (* 2 (logand time 31)))) ; 2 seconds resolution
+    (format "%02d:%02d:%02d" hour minute second)))
+
+;;(defun archive-unixdate (low high)
+;;  "Stringify unix (LOW HIGH) date."
+;;  (let ((str (current-time-string (cons high low))))
+;;    (format "%s-%s-%s"
+;;          (substring str 8 9)
+;;          (substring str 4 7)
+;;          (substring str 20 24))))
+
+;;(defun archive-unixtime (low high)
+;;  "Stringify unix (LOW HIGH) time."
+;;  (let ((str (current-time-string (cons high low))))
+;;    (substring str 11 19)))
+
+(defun archive-get-lineno ()
+  (if (>= (point) archive-file-list-start)
+      (count-lines archive-file-list-start
+                   (save-excursion (beginning-of-line) (point)))
+    0))
+
+(defun archive-get-descr (&optional noerror)
+  "Return the descriptor vector for file at point.  Do not signal an error
+if optional second argument NOERROR is non-nil."
+  (let ((no (archive-get-lineno)))
+    (if (and (>= (point) archive-file-list-start)
+             (< no (length archive-files)))
+        (let ((item (aref archive-files no)))
+          (if (vectorp item)
+              item
+            (if (not noerror)
+                (error "Entry is not a regular member of the archive"))))
+      (if (not noerror)
+          (error "Line does not describe a member of the archive")))))
+;; -------------------------------------------------------------------------
+;; Section: the mode definition
+
+(defun archive-mode (&optional force)
+  "Major mode for viewing an archive file as a dired-like listing of its
+contents.  You can move around using the usual cursor motion commands.
+Letters no longer insert themselves.
+Type `e' to pull a file out of the archive and into its own buffer;
+or click mouse-2 on the file's line in the archive mode buffer.
+
+If you edit a sub-file of this archive (as with the `e' command) and
+save it, the contents of that buffer will be saved back into the
+archive.
+
+\\{archive-mode-map}"
+  ;; This is not interactive because you shouldn't be turning this
+  ;; mode on and off.  You can corrupt things that way.
+  (if (zerop (buffer-size))
+      ;; At present we cannot create archives from scratch
+      (funcall default-major-mode)
+    (if (and (not force) archive-files) nil
+      (let* ((type (archive-find-type))
+             (typename (copy-sequence (symbol-name type))))
+        (aset typename 0 (upcase (aref typename 0)))
+        (kill-all-local-variables)
+        (make-local-variable 'archive-subtype)
+        (setq archive-subtype type)
+
+        ;; Buffer contains treated image of file before the file contents
+        (make-local-variable 'revert-buffer-function)
+        (setq revert-buffer-function 'archive-mode-revert)
+        (auto-save-mode 0)
+        (make-local-variable 'local-write-file-hooks)
+        (add-hook 'local-write-file-hooks 'archive-write-file)
+
+        ;; Real file contents is binary
+        (make-local-variable 'require-final-newline)
+        (setq require-final-newline nil)
+        (make-local-variable 'enable-local-variables)
+        (setq enable-local-variables nil)
+        (setq buffer-file-type t)
+
+        (make-local-variable 'archive-read-only)
+        (setq archive-read-only (not (file-writable-p (buffer-file-name))))
+
+        ;; Should we use a local copy when accessing from outside Emacs?
+        (make-local-variable 'archive-local-name)
+        (make-local-variable 'archive-remote)
+        (setq archive-remote (string-match archive-remote-regexp
+                                           (buffer-file-name)))
+
+        (setq major-mode 'archive-mode)
+        (setq mode-name (concat typename "-Archive"))
+        ;; Run archive-foo-mode-hook and archive-mode-hook
+        (run-hooks (archive-name "mode-hook") 'archive-mode-hook)
+        (use-local-map archive-mode-map))
+
+      (make-local-variable 'archive-proper-file-start)
+      (make-local-variable 'archive-file-list-start)
+      (make-local-variable 'archive-file-list-end)
+      (make-local-variable 'archive-file-name-indent)
+      (archive-summarize)
+      (setq buffer-read-only t))))
+
+;; Archive mode is suitable only for specially formatted data.
+(put 'archive-mode 'mode-class 'special)
+;; -------------------------------------------------------------------------
+;; Section: Key maps
+
+(if archive-mode-map nil
+  (setq archive-mode-map (make-keymap))
+  (suppress-keymap archive-mode-map)
+  (define-key archive-mode-map " " 'archive-next-line)
+  (define-key archive-mode-map "a" 'archive-alternate-display)
+  ;;(define-key archive-mode-map "c" 'archive-copy)
+  (define-key archive-mode-map "d" 'archive-flag-deleted)
+  (define-key archive-mode-map "\C-d" 'archive-flag-deleted)
+  (define-key archive-mode-map "e" 'archive-extract)
+  (define-key archive-mode-map "f" 'archive-extract)
+  (define-key archive-mode-map "\C-m" 'archive-extract)
+  (define-key archive-mode-map [mouse-2] 'archive-mouse-extract)
+  (define-key archive-mode-map "g" 'revert-buffer)
+  (define-key archive-mode-map "h" 'describe-mode)
+  (define-key archive-mode-map "m" 'archive-mark)
+  (define-key archive-mode-map "n" 'archive-next-line)
+  (define-key archive-mode-map "\C-n" 'archive-next-line)
+  (define-key archive-mode-map [down] 'archive-next-line)
+  (define-key archive-mode-map "o" 'archive-extract-other-window)
+  (define-key archive-mode-map "p" 'archive-previous-line)
+  (define-key archive-mode-map "\C-p" 'archive-previous-line)
+  (define-key archive-mode-map [up] 'archive-previous-line)
+  (define-key archive-mode-map "r" 'archive-rename-entry)
+  (define-key archive-mode-map "u" 'archive-unflag)
+  (define-key archive-mode-map "\M-\C-?" 'archive-unmark-all-files)
+  (define-key archive-mode-map "v" 'archive-view)
+  (define-key archive-mode-map "x" 'archive-expunge)
+  (define-key archive-mode-map "\177" 'archive-unflag-backwards)
+  (define-key archive-mode-map "E" 'archive-extract-other-window)
+  (define-key archive-mode-map "M" 'archive-chmod-entry)
+  (define-key archive-mode-map "G" 'archive-chgrp-entry)
+  (define-key archive-mode-map "O" 'archive-chown-entry)
+  (substitute-key-definition 'undo 'archive-undo archive-mode-map global-map)
+
+  ;; Get rid of the Edit menu bar item to save space.
+  (define-key archive-mode-map [menu-bar edit] 'undefined)
+
+  (define-key archive-mode-map [menu-bar immediate]
+    (cons "Immediate" (make-sparse-keymap "Immediate")))
+  (define-key archive-mode-map [menu-bar immediate alternate]
+    '("Alternate Display" . archive-alternate-display))
+  (put 'archive-alternate-display 'menu-enable
+       '(boundp (archive-name "alternate-display")))
+  (define-key archive-mode-map [menu-bar immediate view]
+    '("View This File" . archive-view))
+  (define-key archive-mode-map [menu-bar immediate display]
+    '("Display in Other Window" . archive-display-other-window))
+  (define-key archive-mode-map [menu-bar immediate find-file-other-window]
+    '("Find in Other Window" . archive-extract-other-window))
+  (define-key archive-mode-map [menu-bar immediate find-file]
+    '("Find This File" . archive-extract))
+
+  (define-key archive-mode-map [menu-bar mark]
+    (cons "Mark" (make-sparse-keymap "Mark")))
+  (define-key archive-mode-map [menu-bar mark unmark-all]
+    '("Unmark All" . archive-unmark-all-files))
+  (define-key archive-mode-map [menu-bar mark deletion]
+    '("Flag" . archive-flag-deleted))
+  (define-key archive-mode-map [menu-bar mark unmark]
+    '("Unflag" . archive-unflag))
+  (define-key archive-mode-map [menu-bar mark mark]
+    '("Mark" . archive-mark))
+
+  (define-key archive-mode-map [menu-bar operate]
+    (cons "Operate" (make-sparse-keymap "Operate")))
+  (define-key archive-mode-map [menu-bar operate chown]
+    '("Change Owner..." . archive-chown-entry))
+  (put 'archive-chown-entry 'menu-enable
+       '(fboundp (archive-name "chown-entry")))
+  (define-key archive-mode-map [menu-bar operate chgrp]
+    '("Change Group..." . archive-chgrp-entry))
+  (put 'archive-chgrp-entry 'menu-enable
+       '(fboundp (archive-name "chgrp-entry")))
+  (define-key archive-mode-map [menu-bar operate chmod]
+    '("Change Mode..." . archive-chmod-entry))
+  (put 'archive-chmod-entry 'menu-enable
+       '(fboundp (archive-name "chmod-entry")))
+  (define-key archive-mode-map [menu-bar operate rename]
+    '("Rename to..." . archive-rename-entry))
+  (put 'archive-rename-entry 'menu-enable
+       '(fboundp (archive-name "rename-entry")))
+  ;;(define-key archive-mode-map [menu-bar operate copy]
+  ;;  '("Copy to..." . archive-copy))
+  (define-key archive-mode-map [menu-bar operate expunge]
+    '("Expunge Marked Files" . archive-expunge))
+  )
+
+(let* ((item1 '(archive-subfile-mode " Archive"))
+       (item2 '(archive-subfile-dos " Dos"))
+       (items (if (memq system-type '(ms-dos windows-nt))
+                  (list item1) ; msdog has its own indicator
+                (list item1 item2))))
+  (or (member item1 minor-mode-alist)
+      (setq minor-mode-alist (append items minor-mode-alist))))
+;; -------------------------------------------------------------------------
+(defun archive-find-type ()
+  (widen)
+  (goto-char (point-min))
+  ;; The funny [] here make it unlikely that the .elc file will be treated
+  ;; as an archive by other software.
+  (let (case-fold-search)
+    (cond ((looking-at "[P]K\003\004") 'zip)
+          ((looking-at "..-l[hz][0-9]-") 'lzh)
+          ((looking-at "....................[\334]\247\304\375") 'zoo)
+          ((and (looking-at "\C-z")     ; signature too simple, IMHO
+                (string-match "\\.[aA][rR][cC]$"
+                              (or buffer-file-name (buffer-name))))
+           'arc)
+          (t (error "Buffer format not recognized.")))))
+;; -------------------------------------------------------------------------
+(defun archive-summarize ()
+  "Parse the contents of the archive file in the current buffer.
+Place a dired-like listing on the front;
+then narrow to it, so that only that listing
+is visible (and the real data of the buffer is hidden)."
+  (widen)
+  (let (buffer-read-only)
+    (message "Parsing archive file...")
+    (buffer-disable-undo (current-buffer))
+    (setq archive-files (funcall (archive-name "summarize")))
+    (message "Parsing archive file...done.")
+    (setq archive-proper-file-start (point-marker))
+    (narrow-to-region (point-min) (point))
+    (set-buffer-modified-p nil)
+    (buffer-enable-undo))
+  (goto-char archive-file-list-start)
+  (archive-next-line 0))
+
+(defun archive-resummarize ()
+  "Recreate the contents listing of an archive."
+  (let ((modified (buffer-modified-p))
+        (no (archive-get-lineno))
+        buffer-read-only)
+    (widen)
+    (delete-region (point-min) archive-proper-file-start)
+    (archive-summarize)
+    (set-buffer-modified-p modified)
+    (goto-char archive-file-list-start)
+    (archive-next-line no)))
+
+(defun archive-summarize-files (files)
+  "Insert a desciption of a list of files annotated with proper mouse face"
+  (setq archive-file-list-start (point-marker))
+  (setq archive-file-name-indent (if files (aref (car files) 1) 0))
+  ;; We don't want to do an insert for each element since that takes too
+  ;; long when the archive -- which has to be moved in memory -- is large.
+  (insert
+   (apply
+    (function concat)
+    (mapcar
+     (lambda (fil)
+       ;; Using `concat' here copies the text also, so we can add
+       ;; properties without problems.
+       (let ((text (concat (aref fil 0) "\n")))
+         (put-text-property (aref fil 1) (aref fil 2)
+                            'mouse-face 'highlight
+                            text)
+         text))
+     files)))
+  (setq archive-file-list-end (point-marker)))
+
+(defun archive-alternate-display ()
+  "Toggle alternative display.  To avoid very long lines some archive mode
+don't show all information.  This function changes the set of information
+shown for each files."
+  (interactive)
+  (setq archive-alternate-display (not archive-alternate-display))
+  (archive-resummarize))
+;; -------------------------------------------------------------------------
+;; Section: Local archive copy handling
+
+(defun archive-maybe-copy (archive)
+  (if archive-remote
+      (let ((start (point-max)))
+        (setq archive-local-name (expand-file-name
+                                  (file-name-nondirectory archive)
+                                  archive-tmpdir))
+        (make-directory archive-tmpdir t)
+        (save-restriction
+          (widen)
+          (write-region start (point-max) archive-local-name nil 'nomessage))
+        archive-local-name)
+    (if (buffer-modified-p) (save-buffer))
+    archive))
+
+(defun archive-maybe-update (unchanged)
+  (if archive-remote
+      (let ((name archive-local-name)
+            (modified (buffer-modified-p))
+            buffer-read-only)
+        (if unchanged nil
+          (erase-buffer)
+          (insert-file-contents name)
+          (archive-mode t))
+        (archive-delete-local name)
+        (if (not unchanged)
+            (message "Archive file must be saved for changes to take effect"))
+        (set-buffer-modified-p (or modified (not unchanged))))))
+
+(defun archive-delete-local (name)
+  "Delete (robust) the file NAME and its parents up to and including the
+value of `archive-tmpdir'."
+  (let ((again t)
+        (top (directory-file-name (file-name-as-directory archive-tmpdir))))
+    (condition-case nil
+        (delete-file name)
+      (error nil))
+    (while again
+      (setq name (directory-file-name (file-name-directory name)))
+      (condition-case nil
+          (delete-directory name)
+        (error nil))
+      (if (string= name top) (setq again nil)))))
+;; -------------------------------------------------------------------------
+;; Section: Member extraction
+
+(defun archive-mouse-extract (event)
+  "Extract a file whose name you click on."
+  (interactive "e")
+  (save-excursion
+    (set-buffer (window-buffer (posn-window (event-end event))))
+    (save-excursion
+      (goto-char (posn-point (event-end event)))
+      ;; Just make sure this doesn't get an error.
+      (archive-get-descr)))
+  (select-window (posn-window (event-end event)))
+  (goto-char (posn-point (event-end event)))
+  (archive-extract))
+
+(defun archive-extract (&optional other-window-p)
+  "In archive mode, extract this entry of the archive into its own buffer."
+  (interactive)
+  (let* ((view-p (eq other-window-p 'view))
+         (descr (archive-get-descr))
+         (ename (aref descr 0))
+         (iname (aref descr 1))
+         (archive-buffer (current-buffer))
+         (arcdir default-directory)
+         (archive (buffer-file-name))
+         (arcname (file-name-nondirectory archive))
+         (bufname (concat (file-name-nondirectory iname) " (" arcname ")"))
+         (extractor (archive-name "extract"))
+         (read-only-p (or archive-read-only view-p))
+         (buffer (get-buffer bufname))
+         (just-created nil))
+      (if buffer
+          nil
+        (setq archive (archive-maybe-copy archive))
+        (setq buffer (get-buffer-create bufname))
+        (setq just-created t)
+        (save-excursion
+          (set-buffer buffer)
+          (setq buffer-file-name
+                (expand-file-name (concat arcname ":" iname)))
+          (setq buffer-file-truename
+                (abbreviate-file-name buffer-file-name))
+          ;; Set the default-directory to the dir of the superior buffer.
+          (setq default-directory arcdir)
+          (make-local-variable 'archive-superior-buffer)
+          (setq archive-superior-buffer archive-buffer)
+          (make-local-variable 'local-write-file-hooks)
+          (add-hook 'local-write-file-hooks 'archive-write-file-member)
+          (setq archive-subfile-mode descr)
+          (setq archive-subfile-dos nil
+                buffer-file-type t)
+          (if (fboundp extractor)
+              (funcall extractor archive ename)
+            (archive-*-extract archive ename (symbol-value extractor)))
+          (if archive-dos-members (archive-check-dos))
+          (goto-char (point-min))
+          (rename-buffer bufname)
+          (setq buffer-read-only read-only-p)
+          (setq buffer-undo-list nil)
+          (set-buffer-modified-p nil)
+          (setq buffer-saved-size (buffer-size))
+          (normal-mode)
+          ;; Just in case an archive occurs inside another archive.
+          (if (eq major-mode 'archive-mode)
+              (setq archive-remote t))
+          (run-hooks 'archive-extract-hooks))
+        (archive-maybe-update t))
+      (if view-p
+          (progn
+            (view-buffer buffer)
+            (and just-created (setq view-exit-action 'kill-buffer)))
+        (if (eq other-window-p 'display)
+            (display-buffer buffer)
+          (if other-window-p
+              (switch-to-buffer-other-window buffer)
+            (switch-to-buffer buffer))))))
+
+(defun archive-*-extract (archive name command)
+  (let* ((default-directory (file-name-as-directory archive-tmpdir))
+         (tmpfile (expand-file-name (file-name-nondirectory name)
+                                    default-directory)))
+    (make-directory (directory-file-name default-directory) t)
+    (apply 'call-process
+           (car command)
+           nil
+           nil
+           nil
+           (append (cdr command) (list archive name)))
+    (insert-file-contents tmpfile)
+    (archive-delete-local tmpfile)))
+
+(defun archive-extract-by-stdout (archive name command)
+  (let ((binary-process-output t)) ; for Ms-Dos
+    (apply 'call-process
+           (car command)
+           nil
+           t
+           nil
+           (append (cdr command) (list archive name)))))
+
+(defun archive-extract-other-window ()
+  "In archive mode, find this member in another window."
+  (interactive)
+  (archive-extract t))
+
+(defun archive-display-other-window ()
+  "In archive mode, display this member in another window."
+  (interactive)
+  (archive-extract 'display))
+
+(defun archive-view ()
+  "In archive mode, view the member on this line."
+  (interactive)
+  (archive-extract 'view))
+
+(defun archive-add-new-member (arcbuf name)
+  "Add the file in the current buffer to the archive in ARCBUF naming it
+NAME."
+  (interactive
+   (list (get-buffer
+          (read-buffer "Buffer containing archive: "
+                       ;; Find first archive buffer and suggest that
+                       (let ((bufs (buffer-list)))
+                         (while (and bufs (not (eq (save-excursion
+                                                     (set-buffer (car bufs))
+                                                     major-mode)
+                                                   'archive-mode)))
+                           (setq bufs (cdr bufs)))
+                         (if bufs
+                             (car bufs)
+                           (error "There are no archive buffers")))
+                       t))
+         (read-string "File name in archive: "
+                      (if buffer-file-name
+                          (file-name-nondirectory buffer-file-name)
+                        ""))))
+  (save-excursion
+    (set-buffer arcbuf)
+    (or (eq major-mode 'archive-mode)
+        (error "Buffer is not an archive buffer"))
+    (if archive-read-only
+        (error "Archive is read-only")))
+  (if (eq arcbuf (current-buffer))
+      (error "An archive buffer cannot be added to itself"))
+  (if (string= name "")
+      (error "Archive members may not be given empty names"))
+  (let ((func (save-excursion (set-buffer arcbuf)
+                              (archive-name "add-new-member")))
+        (membuf (current-buffer)))
+    (if (fboundp func)
+        (save-excursion
+          (set-buffer arcbuf)
+          (funcall func buffer-file-name membuf name))
+      (error "Adding a new member is not supported for this archive type"))))
+;; -------------------------------------------------------------------------
+;; Section: IO stuff
+
+(defun archive-check-dos (&optional force)
+  "*If this looks like a buffer with ^M^J as line terminator then remove
+those ^Ms and set archive-subfile-dos."
+  (save-restriction
+    (widen)
+    (save-excursion
+      (goto-char (point-min))
+      (setq archive-subfile-dos
+            (or force (not (search-forward-regexp "[^\r]\n" nil t))))
+      (setq buffer-file-type (not archive-subfile-dos))
+      (if archive-subfile-dos
+          (let ((modified (buffer-modified-p)))
+            (buffer-disable-undo (current-buffer))
+            (goto-char (point-min))
+            (while (search-forward "\r\n" nil t)
+              (replace-match "\n"))
+            (buffer-enable-undo)
+            (set-buffer-modified-p modified))))))
+
+(defun archive-write-file-member ()
+  (if archive-subfile-dos
+      (save-restriction
+        (widen)
+        (save-excursion
+          (goto-char (point-min))
+          ;; We don't want our ^M^J <--> ^J changes to show in the undo list
+          (let ((undo-list buffer-undo-list))
+            (unwind-protect
+                (progn
+                  (setq buffer-undo-list t)
+                  (while (search-forward "\n" nil t)
+                    (replace-match "\r\n"))
+                  (setq archive-subfile-dos nil)
+                  (setq buffer-file-type t)
+                  ;; OK, we're now have explicit ^M^Js -- save and re-unixfy
+                  (archive-write-file-member))
+              (progn
+                (archive-check-dos t)
+                (setq buffer-undo-list undo-list))))
+          t))
+    (save-excursion
+      (save-restriction
+        (message "Updating archive...")
+        (widen)
+        (let ((writer  (save-excursion (set-buffer archive-superior-buffer)
+                                       (archive-name "write-file-member")))
+              (archive (save-excursion (set-buffer archive-superior-buffer)
+                                       (buffer-file-name))))
+          (if (fboundp writer)
+              (funcall writer archive archive-subfile-mode)
+            (archive-*-write-file-member archive
+                                         archive-subfile-mode
+                                         (symbol-value writer))))
+        (set-buffer-modified-p nil)
+        (message "Updating archive...done")
+        (set-buffer archive-superior-buffer)
+        (revert-buffer)
+        t))))
+
+(defun archive-*-write-file-member (archive descr command)
+  (let* ((ename (aref descr 0))
+         (tmpfile (expand-file-name ename archive-tmpdir))
+         (top (directory-file-name (file-name-as-directory archive-tmpdir)))
+         (default-directory (file-name-as-directory top)))
+    (unwind-protect
+        (progn
+          (make-directory (file-name-directory tmpfile) t)
+          (write-region (point-min) (point-max) tmpfile nil 'nomessage)
+          (if (aref descr 3)
+              ;; Set the file modes, but make sure we can read it.
+              (set-file-modes tmpfile (logior ?\400 (aref descr 3))))
+          (let ((exitcode (apply 'call-process
+                                 (car command)
+                                 nil
+                                 nil
+                                 nil
+                                 (append (cdr command) (list archive ename)))))
+            (if (equal exitcode 0)
+                nil
+              (error "Updating was unsuccessful (%S)" exitcode))))
+      (archive-delete-local tmpfile))))
+
+(defun archive-write-file ()
+  (save-excursion
+    (write-region archive-proper-file-start (point-max) buffer-file-name nil t)
+    (set-buffer-modified-p nil)
+    t))
+;; -------------------------------------------------------------------------
+;; Section: Marking and unmarking.
+
+(defun archive-flag-deleted (p &optional type)
+  "In archive mode, mark this member to be deleted from the archive.
+With a prefix argument, mark that many files."
+  (interactive "p")
+  (or type (setq type ?D))
+  (beginning-of-line)
+  (let ((sign (if (>= p 0) +1 -1))
+        (modified (buffer-modified-p))
+        buffer-read-only)
+    (while (not (zerop p))
+      (if (archive-get-descr t)
+          (progn
+            (delete-char 1)
+            (insert type)))
+      (forward-line sign)
+      (setq p (- p sign)))
+    (set-buffer-modified-p modified))
+  (archive-next-line 0))
+
+(defun archive-unflag (p)
+  "In archive mode, un-mark this member if it is marked to be deleted.
+With a prefix argument, un-mark that many files forward."
+  (interactive "p")
+  (archive-flag-deleted p ? ))
+
+(defun archive-unflag-backwards (p)
+  "In archive mode, un-mark this member if it is marked to be deleted.
+With a prefix argument, un-mark that many members backward."
+  (interactive "p")
+  (archive-flag-deleted (- p) ? ))
+
+(defun archive-unmark-all-files ()
+  "Remove all marks."
+  (interactive)
+  (let ((modified (buffer-modified-p))
+        buffer-read-only)
+    (save-excursion
+      (goto-char archive-file-list-start)
+      (while (< (point) archive-file-list-end)
+        (or (= (following-char) ? )
+            (progn (delete-char 1) (insert ? )))
+        (forward-line 1)))
+    (set-buffer-modified-p modified)))
+
+(defun archive-mark (p)
+  "In archive mode, mark this member for group operations.
+With a prefix argument, mark that many members.
+Use \\[archive-unmark-all-files] to remove all marks."
+  (interactive "p")
+  (archive-flag-deleted p ?*))
+
+(defun archive-get-marked (mark &optional default)
+  (let (files)
+    (save-excursion
+      (goto-char archive-file-list-start)
+      (while (< (point) archive-file-list-end)
+        (if (= (following-char) mark)
+            (setq files (cons (archive-get-descr) files)))
+        (forward-line 1)))
+    (or (nreverse files)
+        (and default
+             (list (archive-get-descr))))))
+;; -------------------------------------------------------------------------
+;; Section: Operate
+
+(defun archive-next-line (p)
+  (interactive "p")
+  (forward-line p)
+  (or (eobp)
+      (forward-char archive-file-name-indent)))
+
+(defun archive-previous-line (p)
+  (interactive "p")
+  (archive-next-line (- p)))
+
+(defun archive-chmod-entry (new-mode)
+  "Change the protection bits associated with all marked or this member
+in the archive.\n\
+The new protection bits can either be specified as an octal number or
+as a relative change like \"g+rw\" as for chmod(2)"
+  (interactive "sNew mode (octal or relative): ")
+  (if archive-read-only (error "Archive is read-only"))
+  (let ((func (archive-name "chmod-entry")))
+    (if (fboundp func)
+        (progn
+          (funcall func new-mode (archive-get-marked ?* t))
+          (archive-resummarize))
+      (error "Setting mode bits is not supported for this archive type"))))
+
+(defun archive-chown-entry (new-uid)
+  "Change the owner of all marked or this member."
+  (interactive "nNew uid: ")
+  (if archive-read-only (error "Archive is read-only"))
+  (let ((func (archive-name "chown-entry")))
+    (if (fboundp func)
+        (progn
+          (funcall func new-uid (archive-get-marked ?* t))
+          (archive-resummarize))
+      (error "Setting owner is not supported for this archive type"))))
+
+(defun archive-chgrp-entry (new-gid)
+  "Change the group of all marked or this member."
+  (interactive "nNew gid: ")
+  (if archive-read-only (error "Archive is read-only"))
+  (let ((func (archive-name "chgrp-entry")))
+    (if (fboundp func)
+        (progn
+          (funcall func new-gid (archive-get-marked ?* t))
+          (archive-resummarize))
+      (error "Setting group is not supported for this archive type"))))
+
+(defun archive-expunge ()
+  "Do the flagged deletions."
+  (interactive)
+  (let (files)
+    (save-excursion
+      (goto-char archive-file-list-start)
+      (while (< (point) archive-file-list-end)
+        (if (= (following-char) ?D)
+            (setq files (cons (aref (archive-get-descr) 0) files)))
+        (forward-line 1)))
+    (setq files (nreverse files))
+    (and files
+         (or (not archive-read-only)
+             (error "Archive is read-only"))
+         (or (yes-or-no-p (format "Really delete %d member%s? "
+                                  (length files)
+                                  (if (null (cdr files)) "" "s")))
+             (error "Operation aborted"))
+         (let ((archive (archive-maybe-copy (buffer-file-name)))
+               (expunger (archive-name "expunge")))
+           (if (fboundp expunger)
+               (funcall expunger archive files)
+             (archive-*-expunge archive files (symbol-value expunger)))
+           (archive-maybe-update nil)
+           (if archive-remote
+               (archive-resummarize)
+             (revert-buffer))))))
+
+(defun archive-*-expunge (archive files command)
+  (apply 'call-process
+         (car command)
+         nil
+         nil
+         nil
+         (append (cdr command) (cons archive files))))
+
+(defun archive-rename-entry (newname)
+  "Change the name associated with this entry in the tar file."
+  (interactive "sNew name: ")
+  (if archive-read-only (error "Archive is read-only"))
+  (if (string= newname "")
+      (error "Archive members may not be given empty names"))
+  (let ((func (archive-name "rename-entry"))
+        (descr (archive-get-descr)))
+    (if (fboundp func)
+        (progn
+          (funcall func (buffer-file-name) newname descr)
+          (archive-resummarize))
+      (error "Renaming is not supported for this archive type"))))
+
+;; Revert the buffer and recompute the dired-like listing.
+(defun archive-mode-revert (&optional no-autosave no-confirm)
+  (let ((no (archive-get-lineno)))
+    (setq archive-files nil)
+    (let ((revert-buffer-function nil))
+      (revert-buffer t t))
+    (archive-mode)
+    (goto-char archive-file-list-start)
+    (archive-next-line no)))
+
+(defun archive-undo ()
+  "Undo in an archive buffer.
+This doesn't recover lost files, it just undoes changes in the buffer itself."
+  (interactive)
+  (let (buffer-read-only)
+    (undo)))
+;; -------------------------------------------------------------------------
+;; Section: Arc Archives
+
+(defun archive-arc-summarize ()
+  (let ((p 1)
+        (totalsize 0)
+        (maxlen 8)
+        files
+        visual)
+    (while (and (< (+ p 29) (point-max))
+                (= (char-after p) ?\C-z)
+                (> (char-after (1+ p)) 0))
+      (let* ((namefld (buffer-substring (+ p 2) (+ p 2 13)))
+             (fnlen   (or (string-match "\0" namefld) 13))
+             (efnname (substring namefld 0 fnlen))
+             (csize   (archive-l-e (+ p 15) 4))
+             (moddate (archive-l-e (+ p 19) 2))
+             (modtime (archive-l-e (+ p 21) 2))
+             (ucsize  (archive-l-e (+ p 25) 4))
+             (fiddle  (string= efnname (upcase efnname)))
+             (ifnname (if fiddle (downcase efnname) efnname))
+             (text    (format "  %8d  %-11s  %-8s  %s"
+                              ucsize
+                              (archive-dosdate moddate)
+                              (archive-dostime modtime)
+                              ifnname)))
+        (setq maxlen (max maxlen fnlen)
+              totalsize (+ totalsize ucsize)
+              visual (cons (vector text
+                                   (- (length text) (length ifnname))
+                                   (length text))
+                           visual)
+              files (cons (vector efnname ifnname fiddle nil (1- p))
+                          files)
+              p (+ p 29 csize))))
+    (goto-char (point-min))
+    (let ((dash (concat "- --------  -----------  --------  "
+                        (make-string maxlen ?-)
+                        "\n")))
+      (insert "M   Length  Date         Time      File\n"
+              dash)
+      (archive-summarize-files (nreverse visual))
+      (insert dash
+              (format "  %8d                         %d file%s"
+                      totalsize
+                      (length files)
+                      (if (= 1 (length files)) "" "s"))
+              "\n"))
+    (apply 'vector (nreverse files))))
+
+(defun archive-arc-rename-entry (archive newname descr)
+  (if (string-match "[:\\\\/]" newname)
+      (error "File names in arc files may not contain a path"))
+  (if (> (length newname) 12)
+      (error "File names in arc files are limited to 12 characters"))
+  (let ((name (concat newname (substring "\0\0\0\0\0\0\0\0\0\0\0\0\0"
+                                         (length newname))))
+        buffer-read-only)
+    (save-restriction
+      (save-excursion
+        (widen)
+        (goto-char (+ archive-proper-file-start (aref descr 4) 2))
+        (delete-char 13)
+        (insert name)))))
+;; -------------------------------------------------------------------------
+;; Section: Lzh Archives
+
+(defun archive-lzh-summarize ()
+  (let ((p 1)
+        (totalsize 0)
+        (maxlen 8)
+        files
+        visual)
+    (while (progn (goto-char p) (looking-at "..-l[hz][0-9]-"))
+      (let* ((hsize   (char-after p))
+             (csize   (archive-l-e (+ p 7) 4))
+             (ucsize  (archive-l-e (+ p 11) 4))
+             (modtime (archive-l-e (+ p 15) 2))
+             (moddate (archive-l-e (+ p 17) 2))
+             (fnlen   (char-after (+ p 21)))
+             (efnname (buffer-substring (+ p 22) (+ p 22 fnlen)))
+             (fiddle  (string= efnname (upcase efnname)))
+             (ifnname (if fiddle (downcase efnname) efnname))
+             (p2      (+ p 22 fnlen))
+             (creator (if (>= (- hsize fnlen) 24) (char-after (+ p2 2)) 0))
+             (mode    (if (= creator ?U) (archive-l-e (+ p2 8) 2) ?\666))
+             (modestr (if mode (archive-int-to-mode mode) "??????????"))
+             (uid     (if (= creator ?U) (archive-l-e (+ p2 10) 2)))
+             (gid     (if (= creator ?U) (archive-l-e (+ p2 12) 2)))
+             (text    (if archive-alternate-display
+                          (format "  %8d  %5S  %5S  %s"
+                                  ucsize
+                                  (or uid "?")
+                                  (or gid "?")
+                                  ifnname)
+                        (format "  %10s  %8d  %-11s  %-8s  %s"
+                                modestr
+                                ucsize
+                                (archive-dosdate moddate)
+                                (archive-dostime modtime)
+                                ifnname))))
+        (setq maxlen (max maxlen fnlen)
+              totalsize (+ totalsize ucsize)
+              visual (cons (vector text
+                                   (- (length text) (length ifnname))
+                                   (length text))
+                           visual)
+              files (cons (vector efnname ifnname fiddle mode (1- p))
+                          files)
+              p (+ p hsize 2 csize))))
+    (goto-char (point-min))
+    (let ((dash (concat (if archive-alternate-display
+                            "- --------  -----  -----  "
+                          "- ----------  --------  -----------  --------  ")
+                        (make-string maxlen ?-)
+                        "\n"))
+          (header (if archive-alternate-display
+                       "M   Length    Uid    Gid  File\n"
+                    "M   Filemode    Length  Date         Time      File\n"))
+          (sumline (if archive-alternate-display
+                       "  %8d                %d file%s"
+                     "              %8d                         %d file%s")))
+      (insert header dash)
+      (archive-summarize-files (nreverse visual))
+      (insert dash
+              (format sumline
+                      totalsize
+                      (length files)
+                      (if (= 1 (length files)) "" "s"))
+              "\n"))
+    (apply 'vector (nreverse files))))
+
+(defconst archive-lzh-alternate-display t)
+
+(defun archive-lzh-extract (archive name)
+  (archive-extract-by-stdout archive name archive-lzh-extract))
+
+(defun archive-lzh-resum (p count)
+  (let ((sum 0))
+    (while (> count 0)
+      (setq count (1- count)
+            sum (+ sum (char-after p))
+            p (1+ p)))
+    (logand sum 255)))
+
+(defun archive-lzh-rename-entry (archive newname descr)
+  (save-restriction
+    (save-excursion
+      (widen)
+      (let* ((p        (+ archive-proper-file-start (aref descr 4)))
+             (oldhsize (char-after p))
+             (oldfnlen (char-after (+ p 21)))
+             (newfnlen (length newname))
+             (newhsize (+ oldhsize newfnlen (- oldfnlen)))
+             buffer-read-only)
+        (if (> newhsize 255)
+            (error "The file name is too long"))
+        (goto-char (+ p 21))
+        (delete-char (1+ oldfnlen))
+        (insert newfnlen newname)
+        (goto-char p)
+        (delete-char 2)
+        (insert newhsize (archive-lzh-resum p newhsize))))))
+
+(defun archive-lzh-ogm (newval files errtxt ofs)
+  (save-restriction
+    (save-excursion
+      (widen)
+      (while files
+        (let* ((fil (car files))
+               (p (+ archive-proper-file-start (aref fil 4)))
+               (hsize   (char-after p))
+               (fnlen   (char-after (+ p 21)))
+               (p2      (+ p 22 fnlen))
+               (creator (if (>= (- hsize fnlen) 24) (char-after (+ p2 2)) 0))
+               buffer-read-only)
+          (if (= creator ?U)
+              (progn
+                (or (numberp newval)
+                    (setq newval (funcall newval (archive-l-e (+ p2 ofs) 2))))
+                (goto-char (+ p2 ofs))
+                (delete-char 2)
+                (insert (logand newval 255) (lsh newval -8))
+                (goto-char (1+ p))
+                (delete-char 1)
+                (insert (archive-lzh-resum (1+ p) hsize)))
+            (message "Member %s does not have %s field"
+                     (aref fil 1) errtxt)))
+        (setq files (cdr files))))))
+
+(defun archive-lzh-chown-entry (newuid files)
+  (archive-lzh-ogm newuid files "an uid" 10))
+
+(defun archive-lzh-chgrp-entry (newgid files)
+  (archive-lzh-ogm newgid files "a gid" 12))
+
+(defun archive-lzh-chmod-entry (newmode files)
+  (archive-lzh-ogm
+   ;; This should work even though newmode will be dynamically accessed.
+   (lambda (old) (archive-calc-mode old newmode t))
+   files "a unix-style mode" 8))
+;; -------------------------------------------------------------------------
+;; Section: Zip Archives
+
+(defun archive-zip-summarize ()
+  (goto-char (- (point-max) (- 22 18)))
+  (search-backward-regexp "[P]K\005\006")
+  (let ((p (1+ (archive-l-e (+ (point) 16) 4)))
+        (maxlen 8)
+        (totalsize 0)
+        files
+        visual)
+    (while (string= "PK\001\002" (buffer-substring p (+ p 4)))
+      (let* ((creator (char-after (+ p 5)))
+             (method  (archive-l-e (+ p 10) 2))
+             (modtime (archive-l-e (+ p 12) 2))
+             (moddate (archive-l-e (+ p 14) 2))
+             (ucsize  (archive-l-e (+ p 24) 4))
+             (fnlen   (archive-l-e (+ p 28) 2))
+             (exlen   (archive-l-e (+ p 30) 2))
+             (lheader (archive-l-e (+ p 42) 4))
+             (efnname (buffer-substring (+ p 46) (+ p 46 fnlen)))
+             (isdir   (and (= ucsize 0)
+                           (string= (file-name-nondirectory efnname) "")))
+             (mode    (cond ((memq creator '(2 3)) ; Unix + VMS
+                             (archive-l-e (+ p 40) 2))
+                            ((memq creator '(0 5 6 7 10 11)) ; Dos etc.
+                             (logior ?\444
+                                     (if isdir (logior 16384 ?\111) 0)
+                                     (if (zerop
+                                          (logand 1 (char-after (+ p 38))))
+                                         ?\222 0)))
+                            (t nil)))
+             (modestr (if mode (archive-int-to-mode mode) "??????????"))
+             (fiddle  (and archive-zip-case-fiddle
+                           (not (not (memq creator '(0 2 4 5 9))))))
+             (ifnname (if fiddle (downcase efnname) efnname))
+             (text    (format "  %10s  %8d  %-11s  %-8s  %s"
+                              modestr
+                              ucsize
+                              (archive-dosdate moddate)
+                              (archive-dostime modtime)
+                              ifnname)))
+        (setq maxlen (max maxlen fnlen)
+              totalsize (+ totalsize ucsize)
+              visual (cons (vector text
+                                   (- (length text) (length ifnname))
+                                   (length text))
+                           visual)
+              files (cons (if isdir
+                              nil
+                            (vector efnname ifnname fiddle mode
+                                    (list (1- p) lheader)))
+                          files)
+              p (+ p 46 fnlen exlen))))
+    (goto-char (point-min))
+    (let ((dash (concat "- ----------  --------  -----------  --------  "
+                        (make-string maxlen ?-)
+                        "\n")))
+      (insert "M Filemode      Length  Date         Time      File\n"
+              dash)
+      (archive-summarize-files (nreverse visual))
+      (insert dash
+              (format "              %8d                         %d file%s"
+                      totalsize
+                      (length files)
+                      (if (= 1 (length files)) "" "s"))
+              "\n"))
+    (apply 'vector (nreverse files))))
+
+(defun archive-zip-extract (archive name)
+  (if archive-zip-use-pkzip
+      (archive-*-extract archive name archive-zip-extract)
+    (archive-extract-by-stdout archive name archive-zip-extract)))
+
+(defun archive-zip-write-file-member (archive descr)
+  (archive-*-write-file-member
+   archive
+   descr
+   (if (aref descr 2) archive-zip-update-case archive-zip-update)))
+
+(defun archive-zip-chmod-entry (newmode files)
+  (save-restriction
+    (save-excursion
+      (widen)
+      (while files
+        (let* ((fil (car files))
+               (p (+ archive-proper-file-start (car (aref fil 4))))
+               (creator (char-after (+ p 5)))
+               (oldmode (aref fil 3))
+               (newval  (archive-calc-mode oldmode newmode t))
+               buffer-read-only)
+          (cond ((memq creator '(2 3)) ; Unix + VMS
+                 (goto-char (+ p 40))
+                 (delete-char 2)
+                 (insert (logand newval 255) (lsh newval -8)))
+                ((memq creator '(0 5 6 7 10 11)) ; Dos etc.
+                 (goto-char (+ p 38))
+                 (insert (logior (logand (char-after (point)) 254)
+                                 (logand (logxor 1 (lsh newval -7)) 1)))
+                 (delete-char 1))
+                (t (message "Don't know how to change mode for this member"))))
+        (setq files (cdr files))))))
+;; -------------------------------------------------------------------------
+;; Section: Zoo Archives
+
+(defun archive-zoo-summarize ()
+  (let ((p (1+ (archive-l-e 25 4)))
+        (maxlen 8)
+        (totalsize 0)
+        files
+        visual)
+    (while (and (string= "\334\247\304\375" (buffer-substring p (+ p 4)))
+                (> (archive-l-e (+ p 6) 4) 0))
+      (let* ((next    (1+ (archive-l-e (+ p 6) 4)))
+             (moddate (archive-l-e (+ p 14) 2))
+             (modtime (archive-l-e (+ p 16) 2))
+             (ucsize  (archive-l-e (+ p 20) 4))
+             (namefld (buffer-substring (+ p 38) (+ p 38 13)))
+             (fnlen   (or (string-match "\0" namefld) 13))
+             (efnname (substring namefld 0 fnlen))
+             (fiddle  (string= efnname (upcase efnname)))
+             (ifnname (if fiddle (downcase efnname) efnname))
+             (text    (format "  %8d  %-11s  %-8s  %s"
+                              ucsize
+                              (archive-dosdate moddate)
+                              (archive-dostime modtime)
+                              ifnname)))
+        (setq maxlen (max maxlen fnlen)
+              totalsize (+ totalsize ucsize)
+              visual (cons (vector text
+                                   (- (length text) (length ifnname))
+                                   (length text))
+                           visual)
+              files (cons (vector efnname ifnname fiddle nil (1- p))
+                          files)
+              p next)))
+    (goto-char (point-min))
+    (let ((dash (concat "- --------  -----------  --------  "
+                        (make-string maxlen ?-)
+                        "\n")))
+      (insert "M   Length  Date         Time      File\n"
+              dash)
+      (archive-summarize-files (nreverse visual))
+      (insert dash
+              (format "  %8d                         %d file%s"
+                      totalsize
+                      (length files)
+                      (if (= 1 (length files)) "" "s"))
+              "\n"))
+    (apply 'vector (nreverse files))))
+
+(defun archive-zoo-extract (archive name)
+  (archive-extract-by-stdout archive name archive-zoo-extract))
+;; -------------------------------------------------------------------------
+(provide 'archive-mode)
+
+;; arc-mode.el ends here.