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;;; arc-mode.el --- simple editing of archives

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;; Copyright (C) 1995, 1997 Free Software Foundation, Inc.
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;; Author: Morten Welinder <terra@diku.dk>
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;; Keywords: archives msdog editing major-mode
;; Favourite-brand-of-beer: None, I hate beer.

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;; 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.
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;;; Commentary:
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;; 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.
;; -------------------------------------
;; HOOKS: `foo' means one the the supported archive types.
;;
;; archive-mode-hook
;; archive-foo-mode-hook
;; archive-extract-hooks

;;; Code:

;; -------------------------------------------------------------------------
;; Section: Configuration.

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(defgroup archive nil
  "Simple editing of archives."
  :group 'data)
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(defgroup archive-arc nil
  "ARC-specific options to archive."
  :group 'archive)

(defgroup archive-lzh nil
  "LZH-specific options to archive."
  :group 'archive)

(defgroup archive-zip nil
  "ZIP-specific options to archive."
  :group 'archive)

(defgroup archive-zoo nil
  "ZOO-specific options to archive."
  :group 'archive)

(defcustom archive-tmpdir
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  (expand-file-name
   (make-temp-name (if (eq system-type 'ms-dos) "ar" "archive.tmp"))
   (or (getenv "TMPDIR") (getenv "TMP") "/tmp"))
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  "*Directory for temporary files made by arc-mode.el"
  :type 'directory
  :group 'archive)
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(defcustom archive-remote-regexp "^/[^/:]*[^/:.]:"
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  "*Regexp recognizing archive files names that are not local.
A non-local file is one whose file name is not proper outside Emacs.
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A local copy of the archive will be used when updating."
  :type 'regexp
  :group 'archive)

(defcustom archive-extract-hooks nil
  "*Hooks to run when an archive member has been extracted."
  :type 'hook
  :group 'archive)
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;; ------------------------------
;; 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.
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(defcustom archive-arc-extract
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  '("arc" "x")
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  "*Program and its options to run in order to extract an arc file member.
Extraction should happen to the current directory.  Archive and member
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name will be added."
  :type '(list (string :tag "Program")
		(repeat :tag "Options"
			:inline t
			(string :format "%v")))
  :group 'archive-arc)

(defcustom archive-arc-expunge
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  '("arc" "d")
  "*Program and its options to run in order to delete arc file members.
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Archive and member names will be added."
  :type '(list (string :tag "Program")
		(repeat :tag "Options"
			:inline t
			(string :format "%v")))
  :group 'archive-arc)

(defcustom archive-arc-write-file-member
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  '("arc" "u")
  "*Program and its options to run in order to update an arc file member.
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Archive and member name will be added."
  :type '(list (string :tag "Program")
		(repeat :tag "Options"
			:inline t
			(string :format "%v")))
  :group 'archive-arc)
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;; ------------------------------
;; Lzh archive configuration

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(defcustom archive-lzh-extract
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  '("lha" "pq")
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  "*Program and its options to run in order to extract an lzh file member.
Extraction should happen to standard output.  Archive and member name will
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be added."
  :type '(list (string :tag "Program")
		(repeat :tag "Options"
			:inline t
			(string :format "%v")))
  :group 'archive-lzh)

(defcustom archive-lzh-expunge
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  '("lha" "d")
  "*Program and its options to run in order to delete lzh file members.
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Archive and member names will be added."
  :type '(list (string :tag "Program")
		(repeat :tag "Options"
			:inline t
			(string :format "%v")))
  :group 'archive-lzh)

(defcustom archive-lzh-write-file-member
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  '("lha" "a")
  "*Program and its options to run in order to update an lzh file member.
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Archive and member name will be added."
  :type '(list (string :tag "Program")
		(repeat :tag "Options"
			:inline t
			(string :format "%v")))
  :group 'archive-lzh)
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;; ------------------------------
;; Zip archive configuration

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(defcustom archive-zip-use-pkzip (memq system-type '(ms-dos windows-nt))
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  "*If non-nil then pkzip option are used instead of zip options.
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Only set to true for msdog systems!"
  :type 'boolean
  :group 'archive-zip)
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(defcustom archive-zip-extract
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  (if archive-zip-use-pkzip '("pkunzip" "-e" "-o-") '("unzip" "-qq" "-c"))
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  "*Program and its options to run in order to extract a zip file member.
Extraction should happen to standard output.  Archive and member name will
be added.  If `archive-zip-use-pkzip' is non-nil then this program is
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expected to extract to a file junking the directory part of the name."
  :type '(list (string :tag "Program")
		(repeat :tag "Options"
			:inline t
			(string :format "%v")))
  :group 'archive-zip)
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;; For several reasons the latter behaviour is not desirable in general.
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;; (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.

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(defcustom archive-zip-expunge
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  (if archive-zip-use-pkzip '("pkzip" "-d") '("zip" "-d" "-q"))
  "*Program and its options to run in order to delete zip file members.
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Archive and member names will be added."
  :type '(list (string :tag "Program")
		(repeat :tag "Options"
			:inline t
			(string :format "%v")))
  :group 'archive-zip)

(defcustom archive-zip-update
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  (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
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file.  Archive and member name will be added."
  :type '(list (string :tag "Program")
		(repeat :tag "Options"
			:inline t
			(string :format "%v")))
  :group 'archive-zip)

(defcustom archive-zip-update-case
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  (if archive-zip-use-pkzip archive-zip-update '("zip" "-q" "-k"))
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  "*Program and its options to run in order to update a case fiddled zip member.
Options should ensure that specified directory will be put into the zip file.
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Archive and member name will be added."
  :type '(list (string :tag "Program")
		(repeat :tag "Options"
			:inline t
			(string :format "%v")))
  :group 'archive-zip)

(defcustom archive-zip-case-fiddle t
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  "*If non-nil then zip file members are case fiddled.
Case fiddling will only happen for members created by a system that
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uses caseless file names."
  :type 'boolean
  :group 'archive-zip)
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;; ------------------------------
;; Zoo archive configuration

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(defcustom archive-zoo-extract
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  '("zoo" "xpq")
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  "*Program and its options to run in order to extract a zoo file member.
Extraction should happen to standard output.  Archive and member name will
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be added."
  :type '(list (string :tag "Program")
		(repeat :tag "Options"
			:inline t
			(string :format "%v")))
  :group 'archive-zoo)

(defcustom archive-zoo-expunge
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  '("zoo" "DqPP")
  "*Program and its options to run in order to delete zoo file members.
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Archive and member names will be added."
  :type '(list (string :tag "Program")
		(repeat :tag "Options"
			:inline t
			(string :format "%v")))
  :group 'archive-zoo)

(defcustom archive-zoo-write-file-member
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  '("zoo" "a")
  "*Program and its options to run in order to update a zoo file member.
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Archive and member name will be added."
  :type '(list (string :tag "Program")
		(repeat :tag "Options"
			:inline t
			(string :format "%v")))
  :group 'archive-zoo)
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;; -------------------------------------------------------------------------
;; 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)

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(defvar archive-files nil
  "Vector of file descriptors.
Each descriptor is a vector of the form
 [EXT-FILE-NAME INT-FILE-NAME CASE-FIDDLED MODE ...]")
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(make-variable-buffer-local 'archive-files)
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(defvar archive-lemacs
  (string-match "\\(Lucid\\|Xemacs\\)" emacs-version)
  "*Non-nil when running under under Lucid Emacs or Xemacs.")
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;; -------------------------------------------------------------------------
;; Section: Support functions.

(defsubst archive-name (suffix)
  (intern (concat "archive-" (symbol-name archive-subtype) "-" suffix)))

(defun archive-l-e (str &optional len)
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  "Convert little endian string/vector to integer.
Alternatively, first argument may be a buffer position in the current buffer
in which case a second argument, length, should be supplied."
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  (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)
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  "From the integer OLDMODE and the string NEWMODE calculate a new file mode.
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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)
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  "Return the descriptor vector for file at point.
Does not signal an error if optional second argument NOERROR is non-nil."
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  (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

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;;;###autoload
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(defun archive-mode (&optional force)
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  "Major mode for viewing an archive file in a dired-like way.
You can move around using the usual cursor motion commands.
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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)
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	(make-local-variable 'write-contents-hooks)
	(add-hook 'write-contents-hooks 'archive-write-file)
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	;; 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)

	(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 "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)
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  (if archive-lemacs
      (progn
	;; Not a nice "solution" but it'll have to do
	(define-key archive-mode-map "\C-xu" 'archive-undo)
	(define-key archive-mode-map "\C-_" 'archive-undo))
    (substitute-key-definition 'undo 'archive-undo
			       archive-mode-map global-map))

  (define-key archive-mode-map
    (if archive-lemacs 'button2 [mouse-2]) 'archive-mouse-extract)

  (if archive-lemacs
      ()				; out of luck
    ;; 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))
  ))
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(let* ((item1 '(archive-subfile-mode " Archive"))
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       (items (list item1)))
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  (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)
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	  ((looking-at "..-l[hz][0-9ds]-") 'lzh)
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	  ((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)
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  "Insert a description of a list of files annotated with proper mouse face."
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  (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
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     (function 
      (lambda (fil)
	;; Using `concat' here copies the text also, so we can add
	;; properties without problems.
	(let ((text (concat (aref fil 0) "\n")))
	  (if archive-lemacs
	      ()			; out of luck
	    (put-text-property (aref fil 1) (aref fil 2)
			       'mouse-face 'highlight
			       text))
	  text)))
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     files)))
  (setq archive-file-list-end (point-marker)))

(defun archive-alternate-display ()
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  "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."
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  (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)
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  "Delete file NAME and its parents up to and including `archive-tmpdir'."
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  (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")
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  (mouse-set-point event)
  (switch-to-buffer
   (save-excursion
     (archive-extract)
     (current-buffer))))
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(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)
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;	  (if (boundp 'default-buffer-file-type)
;	      (setq buffer-file-type t))
	  (if (and
	       (null
		(if (fboundp extractor)
		    (funcall extractor archive ename)
		  (archive-*-extract archive ename (symbol-value extractor))))
	       just-created)
	      (progn
		(set-buffer-modified-p nil)
		(kill-buffer buffer))
	    (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)))
      (or (not (buffer-name buffer))
	  (progn
	    (if view-p
		(view-buffer buffer (and just-created '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)))))))
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(defun archive-*-extract (archive name command)
  (let* ((default-directory (file-name-as-directory archive-tmpdir))
	 (tmpfile (expand-file-name (file-name-nondirectory name)
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				    default-directory))
	 exit-status success)
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    (make-directory (directory-file-name default-directory) t)
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    (setq exit-status
	  (apply 'call-process
		 (car command)
		 nil
		 nil
		 nil
		 (append (cdr command) (list archive name))))
    (cond ((and (numberp exit-status) (= exit-status 0))
	   (if (not (file-exists-p tmpfile))
	       (ding (message "`%s': no such file or directory" tmpfile))
	     (insert-file-contents tmpfile)
	     (setq success t)))
	  ((numberp exit-status)
	   (ding
	    (message "`%s' exited with status %d" (car command) exit-status)))
	  ((stringp exit-status)
	   (ding (message "`%s' aborted: %s" (car command) exit-status)))
	  (t
	   (ding (message "`%s' failed" (car command)))))
    (archive-delete-local tmpfile)
    success))
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(defun archive-extract-by-stdout (archive name command)
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  ;; We need the coding system of the output of the extract program,
  ;; including the EOL encoding, be decoded dynamically, since what
  ;; the extract program outputs is the contents of some file.
  (let ((coding-system-for-read (or coding-system-for-read 'undecided))
	(inherit-process-coding-system t))
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    (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)
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  "Add current buffer to the archive in ARCBUF naming it NAME."
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  (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-write-file-member ()
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  (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)))
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(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)
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  "Change the protection bits associated with all marked or this member.
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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)
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    (while (progn (goto-char p) 
		  (looking-at "\\(.\\|\n\\)\\(.\\|\n\\)-l[hz][0-9ds]-"))
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      (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))
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	     (hdrlvl  (char-after (+ p 20)))
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	     (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))
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	     mode modestr uid gid text path prname
	     )
	(if (= hdrlvl 0)
	    (setq mode    (if (= creator ?U) (archive-l-e (+ p2 8) 2) ?\666)
		  uid     (if (= creator ?U) (archive-l-e (+ p2 10) 2))
		  gid     (if (= creator ?U) (archive-l-e (+ p2 12) 2)))
	  (if (= creator ?U)
	      (let* ((p3 (+ p2 3))
		     (hsize (archive-l-e p3 2))
		     (etype (char-after (+ p3 2))))
		(while (not (= hsize 0))
		  (cond
		   ((= etype 2) (let ((i (+ p3 3)))
				  (while (< i (+ p3 hsize))
				    (setq path (concat path
						       (if (= (char-after i)
							      255)
							   "/"
							 (char-to-string
							  (char-after i)))))
				    (setq i (1+ i)))))
		   ((= etype 80) (setq mode (archive-l-e (+ p3 3) 2)))
		   ((= etype 81) (progn (setq uid (archive-l-e (+ p3 3) 2))
					(setq gid (archive-l-e (+ p3 5) 2))))
		   )
		  (setq p3 (+ p3 hsize))
		  (setq hsize (archive-l-e p3 2))
		  (setq etype (char-after (+ p3 2)))))))
	(setq prname (if path (concat path ifnname) ifnname))
	(setq modestr (if mode (archive-int-to-mode mode) "??????????"))
	(setq text    (if archive-alternate-display
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			  (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)
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				ifnname)))
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        (setq maxlen (max maxlen fnlen)
	      totalsize (+ totalsize ucsize)
	      visual (cons (vector text
				   (- (length text) (length ifnname))
				   (length text))
			   visual)
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	      files (cons (vector prname ifnname fiddle mode (1- p))
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                          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.
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   (function (lambda (old) (archive-calc-mode old newmode t)))
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   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))
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             (fclen   (archive-l-e (+ p 32) 2))
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             (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)
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              p (+ p 46 fnlen exlen fclen))))
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    (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)))
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	     (dirtype (char-after (+ p 4)))
	     (lfnlen  (if (= dirtype 2) (char-after (+ p 56)) 0))
	     (ldirlen (if (= dirtype 2) (char-after (+ p 57)) 0))
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	     (fnlen   (or (string-match "\0" namefld) 13))
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	     (efnname (concat
		       (if (> ldirlen 0)
			   (concat (buffer-substring
				    (+ p 58 lfnlen) (+ p 58 lfnlen ldirlen -1))
				   "/")
			 "")
		       (if (> lfnlen 0)
			   (buffer-substring (+ p 58) (+ p 58 lfnlen -1))
			 (substring namefld 0 fnlen))))
	     (fiddle  (and (= lfnlen 0) (string= efnname (upcase efnname))))
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             (ifnname (if fiddle (downcase efnname) efnname))
             (text    (format "  %8d  %-11s  %-8s  %s"
                              ucsize
                              (archive-dosdate moddate)
                              (archive-dostime modtime)
                              ifnname)))
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        (setq maxlen (max maxlen (length ifnname))
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	      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.