lisp/arc-mode.el

   1 ;;; arc-mode.el --- simple editing of archives
   2
   3 ;; Copyright (C) 1995, 1997, 1998, 2003, 2005 Free Software Foundation, Inc.
   4
   5 ;; Author: Morten Welinder <terra@gnu.org>
   6 ;; Keywords: archives msdog editing major-mode
   7 ;; Favourite-brand-of-beer: None, I hate beer.
   8
   9 ;; This file is part of GNU Emacs.
  10
  11 ;; GNU Emacs is free software; you can redistribute it and/or modify
  12 ;; it under the terms of the GNU General Public License as published by
  13 ;; the Free Software Foundation; either version 2, or (at your option)
  14 ;; any later version.
  15
  16 ;; GNU Emacs is distributed in the hope that it will be useful,
  17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 ;; GNU General Public License for more details.
  20
  21 ;; You should have received a copy of the GNU General Public License
  22 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  23 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  24 ;; Boston, MA 02111-1307, USA.
  25
  26 ;;; Commentary:
  27
  28 ;; NAMING: "arc" is short for "archive" and does not refer specifically
  29 ;; to files whose name end in ".arc"
  30 ;;
  31 ;; This code does not decode any files internally, although it does
  32 ;; understand the directory level of the archives.  For this reason,
  33 ;; you should expect this code to need more fiddling than tar-mode.el
  34 ;; (although it at present has fewer bugs :-)  In particular, I have
  35 ;; not tested this under Ms-Dog myself.
  36 ;; -------------------------------------
  37 ;; INTERACTION: arc-mode.el should play together with
  38 ;;
  39 ;; * ange-ftp.el: Remote archives (i.e., ones that ange-ftp has brought
  40 ;;                to you) are handled by doing all updates on a local
  41 ;;                copy.  When you make changes to a remote file the
  42 ;;                changes will first take effect when the archive buffer
  43 ;;                is saved.  You will be warned about this.
  44 ;;
  45 ;; * dos-fns.el:  (Part of Emacs 19).  You get automatic ^M^J <--> ^J
  46 ;;                conversion.
  47 ;;
  48 ;; arc-mode.el does not work well with crypt++.el; for the archives as
  49 ;; such this could be fixed (but wouldn't be useful) by declaring such
  50 ;; archives to be "remote".  For the members this is a general Emacs
  51 ;; problem that 19.29's file formats may fix.
  52 ;; -------------------------------------
  53 ;; ARCHIVE TYPES: Currently only the archives below are handled, but the
  54 ;; structure for handling just about anything is in place.
  55 ;;
  56 ;;                        Arc     Lzh     Zip     Zoo
  57 ;;                        --------------------------------
  58 ;; View listing           Intern  Intern  Intern  Intern
  59 ;; Extract member         Y       Y       Y       Y
  60 ;; Save changed member    Y       Y       Y       Y
  61 ;; Add new member         N       N       N       N
  62 ;; Delete member          Y       Y       Y       Y
  63 ;; Rename member          Y       Y       N       N
  64 ;; Chmod                  -       Y       Y       -
  65 ;; Chown                  -       Y       -       -
  66 ;; Chgrp                  -       Y       -       -
  67 ;;
  68 ;; Special thanks to Bill Brodie <wbrodie@panix.com> for very useful tips
  69 ;; on the first released version of this package.
  70 ;;
  71 ;; This code is partly based on tar-mode.el from Emacs.
  72 ;; -------------------------------------
  73 ;; ARCHIVE STRUCTURES:
  74 ;; (This is mostly for myself.)
  75 ;;
  76 ;; ARC         A series of (header,file).  No interactions among members.
  77 ;;
  78 ;; LZH         A series of (header,file).  Headers are checksummed.  No
  79 ;;             interaction among members.
  80 ;;             Headers come in three flavours called level 0, 1 and 2 headers.
  81 ;;             Level 2 header is free of DOS specific restrictions and most
  82 ;;             prevalently used.  Also level 1 and 2 headers consist of base
  83 ;;             and extension headers.  For more details see
  84 ;;             http://homepage1.nifty.com/dangan/en/Content/Program/Java/jLHA/Notes/Notes.html
  85 ;;             http://www.osirusoft.com/joejared/lzhformat.html
  86 ;;
  87 ;; ZIP         A series of (lheader,fil) followed by a "central directory"
  88 ;;             which is a series of (cheader) followed by an end-of-
  89 ;;             central-dir record possibly followed by junk.  The e-o-c-d
  90 ;;             links to c-d.  cheaders link to lheaders which are basically
  91 ;;             cut-down versions of the cheaders.
  92 ;;
  93 ;; ZOO         An archive header followed by a series of (header,file).
  94 ;;             Each member header points to the next.  The archive is
  95 ;;             terminated by a bogus header with a zero next link.
  96 ;; -------------------------------------
  97 ;; HOOKS: `foo' means one of the supported archive types.
  98 ;;
  99 ;; archive-mode-hook
 100 ;; archive-foo-mode-hook
 101 ;; archive-extract-hooks
 102
 103 ;;; Code:
 104
 105 ;; -------------------------------------------------------------------------
 106 ;; Section: Configuration.
 107
 108 (defgroup archive nil
 109   "Simple editing of archives."
 110   :group 'data)
 111
 112 (defgroup archive-arc nil
 113   "ARC-specific options to archive."
 114   :group 'archive)
 115
 116 (defgroup archive-lzh nil
 117   "LZH-specific options to archive."
 118   :group 'archive)
 119
 120 (defgroup archive-zip nil
 121   "ZIP-specific options to archive."
 122   :group 'archive)
 123
 124 (defgroup archive-zoo nil
 125   "ZOO-specific options to archive."
 126   :group 'archive)
 127
 128 (defcustom archive-tmpdir
 129   ;; make-temp-name is safe here because we use this name
 130   ;; to create a directory.
 131   (make-temp-name
 132    (expand-file-name (if (eq system-type 'ms-dos) "ar" "archive.tmp")
 133                      temporary-file-directory))
 134   "*Directory for temporary files made by arc-mode.el"
 135   :type 'directory
 136   :group 'archive)
 137
 138 (defcustom archive-remote-regexp "^/[^/:]*[^/:.]:"
 139   "*Regexp recognizing archive files names that are not local.
 140 A non-local file is one whose file name is not proper outside Emacs.
 141 A local copy of the archive will be used when updating."
 142   :type 'regexp
 143   :group 'archive)
 144
 145 (defcustom archive-extract-hooks nil
 146   "*Hooks to run when an archive member has been extracted."
 147   :type 'hook
 148   :group 'archive)
 149 ;; ------------------------------
 150 ;; Arc archive configuration
 151
 152 ;; We always go via a local file since there seems to be no reliable way
 153 ;; to extract to stdout without junk getting added.
 154 (defcustom archive-arc-extract
 155   '("arc" "x")
 156   "*Program and its options to run in order to extract an arc file member.
 157 Extraction should happen to the current directory.  Archive and member
 158 name will be added."
 159   :type '(list (string :tag "Program")
 160                 (repeat :tag "Options"
 161                         :inline t
 162                         (string :format "%v")))
 163   :group 'archive-arc)
 164
 165 (defcustom archive-arc-expunge
 166   '("arc" "d")
 167   "*Program and its options to run in order to delete arc file members.
 168 Archive and member names will be added."
 169   :type '(list (string :tag "Program")
 170                 (repeat :tag "Options"
 171                         :inline t
 172                         (string :format "%v")))
 173   :group 'archive-arc)
 174
 175 (defcustom archive-arc-write-file-member
 176   '("arc" "u")
 177   "*Program and its options to run in order to update an arc file member.
 178 Archive and member name will be added."
 179   :type '(list (string :tag "Program")
 180                 (repeat :tag "Options"
 181                         :inline t
 182                         (string :format "%v")))
 183   :group 'archive-arc)
 184 ;; ------------------------------
 185 ;; Lzh archive configuration
 186
 187 (defcustom archive-lzh-extract
 188   '("lha" "pq")
 189   "*Program and its options to run in order to extract an lzh file member.
 190 Extraction should happen to standard output.  Archive and member name will
 191 be added."
 192   :type '(list (string :tag "Program")
 193                 (repeat :tag "Options"
 194                         :inline t
 195                         (string :format "%v")))
 196   :group 'archive-lzh)
 197
 198 (defcustom archive-lzh-expunge
 199   '("lha" "d")
 200   "*Program and its options to run in order to delete lzh file members.
 201 Archive and member names will be added."
 202   :type '(list (string :tag "Program")
 203                 (repeat :tag "Options"
 204                         :inline t
 205                         (string :format "%v")))
 206   :group 'archive-lzh)
 207
 208 (defcustom archive-lzh-write-file-member
 209   '("lha" "a")
 210   "*Program and its options to run in order to update an lzh file member.
 211 Archive and member name will be added."
 212   :type '(list (string :tag "Program")
 213                 (repeat :tag "Options"
 214                         :inline t
 215                         (string :format "%v")))
 216   :group 'archive-lzh)
 217 ;; ------------------------------
 218 ;; Zip archive configuration
 219
 220 (defcustom archive-zip-extract
 221   (if (locate-file "unzip" nil 'file-executable-p)
 222       '("unzip" "-qq" "-c")
 223     (if (locate-file "pkunzip" nil 'file-executable-p)
 224         '("pkunzip" "-e" "-o-")
 225       '("unzip" "-qq" "-c")))
 226   "*Program and its options to run in order to extract a zip file member.
 227 Extraction should happen to standard output.  Archive and member name will
 228 be added.  If `archive-zip-use-pkzip' is non-nil then this program is
 229 expected to extract to a file junking the directory part of the name."
 230   :type '(list (string :tag "Program")
 231                 (repeat :tag "Options"
 232                         :inline t
 233                         (string :format "%v")))
 234   :group 'archive-zip)
 235
 236 ;; For several reasons the latter behaviour is not desirable in general.
 237 ;; (1) It uses more disk space.  (2) Error checking is worse or non-
 238 ;; existent.  (3) It tends to do funny things with other systems' file
 239 ;; names.
 240
 241 (defcustom archive-zip-expunge
 242   (if (locate-file "zip" nil 'file-executable-p)
 243       '("zip" "-d" "-q")
 244     (if (locate-file "pkzip" nil 'file-executable-p)
 245          '("pkzip" "-d")
 246       '("zip" "-d" "-q")))
 247   "*Program and its options to run in order to delete zip file members.
 248 Archive and member names will be added."
 249   :type '(list (string :tag "Program")
 250                 (repeat :tag "Options"
 251                         :inline t
 252                         (string :format "%v")))
 253   :group 'archive-zip)
 254
 255 (defcustom archive-zip-update
 256   (if (locate-file "zip" nil 'file-executable-p)
 257       '("zip" "-q")
 258     (if (locate-file "pkzip" nil 'file-executable-p)
 259          '("pkzip" "-u" "-P")
 260       '("zip" "-q")))
 261   "*Program and its options to run in order to update a zip file member.
 262 Options should ensure that specified directory will be put into the zip
 263 file.  Archive and member name will be added."
 264   :type '(list (string :tag "Program")
 265                 (repeat :tag "Options"
 266                         :inline t
 267                         (string :format "%v")))
 268   :group 'archive-zip)
 269
 270 (defcustom archive-zip-update-case
 271   (if (locate-file "zip" nil 'file-executable-p)
 272       '("zip" "-q" "-k")
 273     (if (locate-file "pkzip" nil 'file-executable-p)
 274          '("pkzip" "-u" "-P")
 275       '("zip" "-q" "-k")))
 276   "*Program and its options to run in order to update a case fiddled zip member.
 277 Options should ensure that specified directory will be put into the zip file.
 278 Archive and member name will be added."
 279   :type '(list (string :tag "Program")
 280                 (repeat :tag "Options"
 281                         :inline t
 282                         (string :format "%v")))
 283   :group 'archive-zip)
 284
 285 (defcustom archive-zip-case-fiddle t
 286   "*If non-nil then zip file members may be down-cased.
 287 This case fiddling will only happen for members created by a system
 288 that uses caseless file names."
 289   :type 'boolean
 290   :group 'archive-zip)
 291 ;; ------------------------------
 292 ;; Zoo archive configuration
 293
 294 (defcustom archive-zoo-extract
 295   '("zoo" "xpq")
 296   "*Program and its options to run in order to extract a zoo file member.
 297 Extraction should happen to standard output.  Archive and member name will
 298 be added."
 299   :type '(list (string :tag "Program")
 300                 (repeat :tag "Options"
 301                         :inline t
 302                         (string :format "%v")))
 303   :group 'archive-zoo)
 304
 305 (defcustom archive-zoo-expunge
 306   '("zoo" "DqPP")
 307   "*Program and its options to run in order to delete zoo file members.
 308 Archive and member names will be added."
 309   :type '(list (string :tag "Program")
 310                 (repeat :tag "Options"
 311                         :inline t
 312                         (string :format "%v")))
 313   :group 'archive-zoo)
 314
 315 (defcustom archive-zoo-write-file-member
 316   '("zoo" "a")
 317   "*Program and its options to run in order to update a zoo file member.
 318 Archive and member name will be added."
 319   :type '(list (string :tag "Program")
 320                 (repeat :tag "Options"
 321                         :inline t
 322                         (string :format "%v")))
 323   :group 'archive-zoo)
 324 ;; -------------------------------------------------------------------------
 325 ;; Section: Variables
 326
 327 (defvar archive-subtype nil "Symbol describing archive type.")
 328 (defvar archive-file-list-start nil "Position of first contents line.")
 329 (defvar archive-file-list-end nil "Position just after last contents line.")
 330 (defvar archive-proper-file-start nil "Position of real archive's start.")
 331 (defvar archive-read-only nil "Non-nil if the archive is read-only on disk.")
 332 (defvar archive-local-name nil "Name of local copy of remote archive.")
 333 (defvar archive-mode-map
 334   (let ((map (make-keymap)))
 335     (suppress-keymap map)
 336     (define-key map " " 'archive-next-line)
 337     (define-key map "a" 'archive-alternate-display)
 338     ;;(define-key map "c" 'archive-copy)
 339     (define-key map "d" 'archive-flag-deleted)
 340     (define-key map "\C-d" 'archive-flag-deleted)
 341     (define-key map "e" 'archive-extract)
 342     (define-key map "f" 'archive-extract)
 343     (define-key map "\C-m" 'archive-extract)
 344     (define-key map "g" 'revert-buffer)
 345     (define-key map "h" 'describe-mode)
 346     (define-key map "m" 'archive-mark)
 347     (define-key map "n" 'archive-next-line)
 348     (define-key map "\C-n" 'archive-next-line)
 349     (define-key map [down] 'archive-next-line)
 350     (define-key map "o" 'archive-extract-other-window)
 351     (define-key map "p" 'archive-previous-line)
 352     (define-key map "q" 'quit-window)
 353     (define-key map "\C-p" 'archive-previous-line)
 354     (define-key map [up] 'archive-previous-line)
 355     (define-key map "r" 'archive-rename-entry)
 356     (define-key map "u" 'archive-unflag)
 357     (define-key map "\M-\C-?" 'archive-unmark-all-files)
 358     (define-key map "v" 'archive-view)
 359     (define-key map "x" 'archive-expunge)
 360     (define-key map "\177" 'archive-unflag-backwards)
 361     (define-key map "E" 'archive-extract-other-window)
 362     (define-key map "M" 'archive-chmod-entry)
 363     (define-key map "G" 'archive-chgrp-entry)
 364     (define-key map "O" 'archive-chown-entry)
 365
 366     (if (fboundp 'command-remapping)
 367         (progn
 368           (define-key map [remap advertised-undo] 'archive-undo)
 369           (define-key map [remap undo] 'archive-undo))
 370       (substitute-key-definition 'advertised-undo 'archive-undo map global-map)
 371       (substitute-key-definition 'undo 'archive-undo map global-map))
 372
 373     (define-key map
 374       (if (featurep 'xemacs) 'button2 [mouse-2]) 'archive-mouse-extract)
 375
 376     (if (featurep 'xemacs)
 377         ()                              ; out of luck
 378
 379       (define-key map [menu-bar immediate]
 380         (cons "Immediate" (make-sparse-keymap "Immediate")))
 381       (define-key map [menu-bar immediate alternate]
 382         '(menu-item "Alternate Display" archive-alternate-display
 383           :enable (boundp (archive-name "alternate-display"))
 384           :help "Toggle alternate file info display"))
 385       (define-key map [menu-bar immediate view]
 386         '(menu-item "View This File" archive-view
 387           :help "Display file at cursor in View Mode"))
 388       (define-key map [menu-bar immediate display]
 389         '(menu-item "Display in Other Window" archive-display-other-window
 390           :help "Display file at cursor in another window"))
 391       (define-key map [menu-bar immediate find-file-other-window]
 392         '(menu-item "Find in Other Window" archive-extract-other-window
 393           :help "Edit file at cursor in another window"))
 394       (define-key map [menu-bar immediate find-file]
 395         '(menu-item "Find This File" archive-extract
 396           :help "Extract file at cursor and edit it"))
 397
 398       (define-key map [menu-bar mark]
 399         (cons "Mark" (make-sparse-keymap "Mark")))
 400       (define-key map [menu-bar mark unmark-all]
 401         '(menu-item "Unmark All" archive-unmark-all-files
 402           :help "Unmark all marked files"))
 403       (define-key map [menu-bar mark deletion]
 404         '(menu-item "Flag" archive-flag-deleted
 405           :help "Flag file at cursor for deletion"))
 406       (define-key map [menu-bar mark unmark]
 407         '(menu-item "Unflag" archive-unflag
 408           :help "Unmark file at cursor"))
 409       (define-key map [menu-bar mark mark]
 410         '(menu-item "Mark" archive-mark
 411           :help "Mark file at cursor"))
 412
 413       (define-key map [menu-bar operate]
 414         (cons "Operate" (make-sparse-keymap "Operate")))
 415       (define-key map [menu-bar operate chown]
 416         '(menu-item "Change Owner..." archive-chown-entry
 417           :enable (fboundp (archive-name "chown-entry"))
 418           :help "Change owner of marked files"))
 419       (define-key map [menu-bar operate chgrp]
 420         '(menu-item "Change Group..." archive-chgrp-entry
 421           :enable (fboundp (archive-name "chgrp-entry"))
 422           :help "Change group ownership of marked files"))
 423       (define-key map [menu-bar operate chmod]
 424         '(menu-item "Change Mode..." archive-chmod-entry
 425           :enable (fboundp (archive-name "chmod-entry"))
 426           :help "Change mode (permissions) of marked files"))
 427       (define-key map [menu-bar operate rename]
 428         '(menu-item "Rename to..." archive-rename-entry
 429           :enable (fboundp (archive-name "rename-entry"))
 430           :help "Rename marked files"))
 431       ;;(define-key map [menu-bar operate copy]
 432       ;;  '(menu-item "Copy to..." archive-copy))
 433       (define-key map [menu-bar operate expunge]
 434         '(menu-item "Expunge Marked Files" archive-expunge
 435           :help "Delete all flagged files from archive"))
 436       map))
 437   "Local keymap for archive mode listings.")
 438 (defvar archive-file-name-indent nil "Column where file names start.")
 439
 440 (defvar archive-remote nil "Non-nil if the archive is outside file system.")
 441 (make-variable-buffer-local 'archive-remote)
 442 (put 'archive-remote 'permanent-local t)
 443
 444 (defvar archive-member-coding-system nil "Coding-system of archive member.")
 445 (make-variable-buffer-local 'archive-member-coding-system)
 446
 447 (defvar archive-alternate-display nil
 448   "Non-nil when alternate information is shown.")
 449 (make-variable-buffer-local 'archive-alternate-display)
 450 (put 'archive-alternate-display 'permanent-local t)
 451
 452 (defvar archive-superior-buffer nil "In archive members, points to archive.")
 453 (put 'archive-superior-buffer 'permanent-local t)
 454
 455 (defvar archive-subfile-mode nil "Non-nil in archive member buffers.")
 456 (make-variable-buffer-local 'archive-subfile-mode)
 457 (put 'archive-subfile-mode 'permanent-local t)
 458
 459 (defvar archive-file-name-coding-system nil)
 460 (make-variable-buffer-local 'archive-file-name-coding-system)
 461 (put 'archive-file-name-coding-system 'permanent-local t)
 462
 463 (defvar archive-files nil
 464   "Vector of file descriptors.
 465 Each descriptor is a vector of the form
 466  [EXT-FILE-NAME INT-FILE-NAME CASE-FIDDLED MODE ...]")
 467 (make-variable-buffer-local 'archive-files)
 468
 469 ;; -------------------------------------------------------------------------
 470 ;; Section: Support functions.
 471
 472 (eval-when-compile
 473   (defsubst byte-after (pos)
 474     "Like char-after but an eight-bit char is converted to unibyte."
 475     (multibyte-char-to-unibyte (char-after pos)))
 476   (defsubst insert-unibyte (&rest args)
 477     "Like insert but don't make unibyte string and eight-bit char multibyte."
 478     (dolist (elt args)
 479       (if (integerp elt)
 480           (insert (if (< elt 128) elt (decode-char 'eight-bit elt)))
 481         (insert (string-to-multibyte elt)))))
 482   )
 483
 484 (defsubst archive-name (suffix)
 485   (intern (concat "archive-" (symbol-name archive-subtype) "-" suffix)))
 486
 487 (defun archive-l-e (str &optional len)
 488   "Convert little endian string/vector to integer.
 489 Alternatively, first argument may be a buffer position in the current buffer
 490 in which case a second argument, length, should be supplied."
 491   (if (stringp str)
 492       (setq len (length str))
 493     (setq str (buffer-substring str (+ str len))))
 494   (setq str (string-as-unibyte str))
 495   (let ((result 0)
 496         (i 0))
 497     (while (< i len)
 498       (setq i (1+ i)
 499             result (+ (ash result 8) (aref str (- len i)))))
 500     result))
 501
 502 (defun archive-int-to-mode (mode)
 503   "Turn an integer like 0700 (i.e., 448) into a mode string like -rwx------."
 504   ;; FIXME: merge with tar-grind-file-mode.
 505   (string
 506     (if (zerop (logand  8192 mode))
 507         (if (zerop (logand 16384 mode)) ?- ?d)
 508       ?c) ; completeness
 509     (if (zerop (logand   256 mode)) ?- ?r)
 510     (if (zerop (logand   128 mode)) ?- ?w)
 511     (if (zerop (logand    64 mode))
 512         (if (zerop (logand  1024 mode)) ?- ?S)
 513       (if (zerop (logand  1024 mode)) ?x ?s))
 514     (if (zerop (logand    32 mode)) ?- ?r)
 515     (if (zerop (logand    16 mode)) ?- ?w)
 516     (if (zerop (logand     8 mode))
 517         (if (zerop (logand  2048 mode)) ?- ?S)
 518       (if (zerop (logand  2048 mode)) ?x ?s))
 519     (if (zerop (logand     4 mode)) ?- ?r)
 520     (if (zerop (logand     2 mode)) ?- ?w)
 521     (if (zerop (logand     1 mode)) ?- ?x)))
 522
 523 (defun archive-calc-mode (oldmode newmode &optional error)
 524   "From the integer OLDMODE and the string NEWMODE calculate a new file mode.
 525 NEWMODE may be an octal number including a leading zero in which case it
 526 will become the new mode.\n
 527 NEWMODE may also be a relative specification like \"og-rwx\" in which case
 528 OLDMODE will be modified accordingly just like chmod(2) would have done.\n
 529 If optional third argument ERROR is non-nil an error will be signaled if
 530 the mode is invalid.  If ERROR is nil then nil will be returned."
 531   (cond ((string-match "^0[0-7]*$" newmode)
 532          (let ((result 0)
 533                (len (length newmode))
 534                (i 1))
 535            (while (< i len)
 536              (setq result (+ (lsh result 3) (aref newmode i) (- ?0))
 537                    i (1+ i)))
 538            (logior (logand oldmode 65024) result)))
 539         ((string-match "^\\([agou]+\\)\\([---+=]\\)\\([rwxst]+\\)$" newmode)
 540          (let ((who 0)
 541                (result oldmode)
 542                (op (aref newmode (match-beginning 2)))
 543                (bits 0)
 544                (i (match-beginning 3)))
 545            (while (< i (match-end 3))
 546              (let ((rwx (aref newmode i)))
 547                (setq bits (logior bits (cond ((= rwx ?r)  292)
 548                                              ((= rwx ?w)  146)
 549                                              ((= rwx ?x)   73)
 550                                              ((= rwx ?s) 3072)
 551                                              ((= rwx ?t)  512)))
 552                      i (1+ i))))
 553            (while (< who (match-end 1))
 554              (let* ((whoc (aref newmode who))
 555                     (whomask (cond ((= whoc ?a) 4095)
 556                                    ((= whoc ?u) 1472)
 557                                    ((= whoc ?g) 2104)
 558                                    ((= whoc ?o)    7))))
 559                (if (= op ?=)
 560                    (setq result (logand result (lognot whomask))))
 561                (if (= op ?-)
 562                    (setq result (logand result (lognot (logand whomask bits))))
 563                  (setq result (logior result (logand whomask bits)))))
 564              (setq who (1+ who)))
 565            result))
 566         (t
 567          (if error
 568              (error "Invalid mode specification: %s" newmode)))))
 569
 570 (defun archive-dosdate (date)
 571   "Stringify dos packed DATE record."
 572   (let ((year (+ 1980 (logand (ash date -9) 127)))
 573         (month (logand (ash date -5) 15))
 574         (day (logand date 31)))
 575     (if (or (> month 12) (< month 1))
 576         ""
 577       (format "%2d-%s-%d"
 578               day
 579               (aref ["Jan" "Feb" "Mar" "Apr" "May" "Jun"
 580                      "Jul" "Aug" "Sep" "Oct" "Nov" "Dec"] (1- month))
 581               year))))
 582
 583 (defun archive-dostime (time)
 584   "Stringify dos packed TIME record."
 585   (let ((hour (logand (ash time -11) 31))
 586         (minute (logand (ash time -5) 63))
 587         (second (* 2 (logand time 31)))) ; 2 seconds resolution
 588     (format "%02d:%02d:%02d" hour minute second)))
 589
 590 (defun archive-unixdate (low high)
 591   "Stringify unix (LOW HIGH) date."
 592   (let ((str (current-time-string (cons high low))))
 593     (format "%s-%s-%s"
 594             (substring str 8 10)
 595             (substring str 4 7)
 596             (substring str 20 24))))
 597
 598 (defun archive-unixtime (low high)
 599   "Stringify unix (LOW HIGH) time."
 600   (let ((str (current-time-string (cons high low))))
 601     (substring str 11 19)))
 602
 603 (defun archive-get-lineno ()
 604   (if (>= (point) archive-file-list-start)
 605       (count-lines archive-file-list-start
 606                    (save-excursion (beginning-of-line) (point)))
 607     0))
 608
 609 (defun archive-get-descr (&optional noerror)
 610   "Return the descriptor vector for file at point.
 611 Does not signal an error if optional second argument NOERROR is non-nil."
 612   (let ((no (archive-get-lineno)))
 613     (if (and (>= (point) archive-file-list-start)
 614              (< no (length archive-files)))
 615         (let ((item (aref archive-files no)))
 616           (if (vectorp item)
 617               item
 618             (if (not noerror)
 619                 (error "Entry is not a regular member of the archive"))))
 620       (if (not noerror)
 621           (error "Line does not describe a member of the archive")))))
 622 ;; -------------------------------------------------------------------------
 623 ;; Section: the mode definition
 624
 625 ;;;###autoload
 626 (defun archive-mode (&optional force)
 627   "Major mode for viewing an archive file in a dired-like way.
 628 You can move around using the usual cursor motion commands.
 629 Letters no longer insert themselves.
 630 Type `e' to pull a file out of the archive and into its own buffer;
 631 or click mouse-2 on the file's line in the archive mode buffer.
 632
 633 If you edit a sub-file of this archive (as with the `e' command) and
 634 save it, the contents of that buffer will be saved back into the
 635 archive.
 636
 637 \\{archive-mode-map}"
 638   ;; This is not interactive because you shouldn't be turning this
 639   ;; mode on and off.  You can corrupt things that way.
 640   (if (zerop (buffer-size))
 641       ;; At present we cannot create archives from scratch
 642       (funcall default-major-mode)
 643     (if (and (not force) archive-files) nil
 644       (let* ((type (archive-find-type))
 645              (typename (capitalize (symbol-name type))))
 646         (kill-all-local-variables)
 647         (make-local-variable 'archive-subtype)
 648         (setq archive-subtype type)
 649
 650         ;; Buffer contains treated image of file before the file contents
 651         (make-local-variable 'revert-buffer-function)
 652         (setq revert-buffer-function 'archive-mode-revert)
 653         (auto-save-mode 0)
 654
 655         ;; Remote archives are not written by a hook.
 656         (if archive-remote nil
 657           (make-local-variable 'write-contents-hooks)
 658           (add-hook 'write-contents-hooks 'archive-write-file))
 659
 660         (make-local-variable 'require-final-newline)
 661         (setq require-final-newline nil)
 662         (make-local-variable 'local-enable-local-variables)
 663         (setq local-enable-local-variables nil)
 664
 665         ;; Prevent loss of data when saving the file.
 666         (make-local-variable 'file-precious-flag)
 667         (setq file-precious-flag t)
 668
 669         (make-local-variable 'archive-read-only)
 670         ;; Archives which are inside other archives and whose
 671         ;; names are invalid for this OS, can't be written.
 672         (setq archive-read-only
 673               (or (not (file-writable-p (buffer-file-name)))
 674                   (and archive-subfile-mode
 675                        (string-match file-name-invalid-regexp
 676                                      (aref archive-subfile-mode 0)))))
 677
 678         ;; Should we use a local copy when accessing from outside Emacs?
 679         (make-local-variable 'archive-local-name)
 680
 681         ;; An archive can contain another archive whose name is invalid
 682         ;; on local filesystem.  Treat such archives as remote.
 683         (or archive-remote
 684             (setq archive-remote
 685                   (or (string-match archive-remote-regexp (buffer-file-name))
 686                       (string-match file-name-invalid-regexp
 687                                     (buffer-file-name)))))
 688
 689         (setq major-mode 'archive-mode)
 690         (setq mode-name (concat typename "-Archive"))
 691         ;; Run archive-foo-mode-hook and archive-mode-hook
 692         (run-hooks (archive-name "mode-hook") 'archive-mode-hook)
 693         (use-local-map archive-mode-map))
 694
 695       (make-local-variable 'archive-proper-file-start)
 696       (make-local-variable 'archive-file-list-start)
 697       (make-local-variable 'archive-file-list-end)
 698       (make-local-variable 'archive-file-name-indent)
 699       (setq archive-file-name-coding-system
 700             (or file-name-coding-system
 701                 default-file-name-coding-system
 702                 locale-coding-system))
 703       (if default-enable-multibyte-characters
 704           (set-buffer-multibyte 'to))
 705       (archive-summarize nil)
 706       (setq buffer-read-only t))))
 707
 708 ;; Archive mode is suitable only for specially formatted data.
 709 (put 'archive-mode 'mode-class 'special)
 710 ;; -------------------------------------------------------------------------
 711 ;; Section: Key maps
 712
 713 (let ((item1 '(archive-subfile-mode " Archive")))
 714   (or (member item1 minor-mode-alist)
 715       (setq minor-mode-alist (cons item1 minor-mode-alist))))
 716 ;; -------------------------------------------------------------------------
 717 (defun archive-find-type ()
 718   (widen)
 719   (goto-char (point-min))
 720   ;; The funny [] here make it unlikely that the .elc file will be treated
 721   ;; as an archive by other software.
 722   (let (case-fold-search)
 723     (cond ((looking-at "[P]K\003\004") 'zip)
 724           ((looking-at "..-l[hz][0-9ds]-") 'lzh)
 725           ((looking-at "....................[\334]\247\304\375") 'zoo)
 726           ((and (looking-at "\C-z")     ; signature too simple, IMHO
 727                 (string-match "\\.[aA][rR][cC]$"
 728                               (or buffer-file-name (buffer-name))))
 729            'arc)
 730           (t (error "Buffer format not recognized")))))
 731 ;; -------------------------------------------------------------------------
 732 (defun archive-summarize (&optional shut-up)
 733   "Parse the contents of the archive file in the current buffer.
 734 Place a dired-like listing on the front;
 735 then narrow to it, so that only that listing
 736 is visible (and the real data of the buffer is hidden).
 737 Optional argument SHUT-UP, if non-nil, means don't print messages
 738 when parsing the archive."
 739   (widen)
 740   (let (buffer-read-only)
 741     (or shut-up
 742         (message "Parsing archive file..."))
 743     (buffer-disable-undo (current-buffer))
 744     (setq archive-files (funcall (archive-name "summarize")))
 745     (or shut-up
 746         (message "Parsing archive file...done."))
 747     (setq archive-proper-file-start (point-marker))
 748     (narrow-to-region (point-min) (point))
 749     (set-buffer-modified-p nil)
 750     (buffer-enable-undo))
 751   (goto-char archive-file-list-start)
 752   (archive-next-line 0))
 753
 754 (defun archive-resummarize ()
 755   "Recreate the contents listing of an archive."
 756   (let ((modified (buffer-modified-p))
 757         (no (archive-get-lineno))
 758         buffer-read-only)
 759     (widen)
 760     (delete-region (point-min) archive-proper-file-start)
 761     (archive-summarize t)
 762     (set-buffer-modified-p modified)
 763     (goto-char archive-file-list-start)
 764     (archive-next-line no)))
 765
 766 (defun archive-summarize-files (files)
 767   "Insert a description of a list of files annotated with proper mouse face."
 768   (setq archive-file-list-start (point-marker))
 769   (setq archive-file-name-indent (if files (aref (car files) 1) 0))
 770   ;; We don't want to do an insert for each element since that takes too
 771   ;; long when the archive -- which has to be moved in memory -- is large.
 772   (insert
 773    (apply
 774     (function concat)
 775     (mapcar
 776      (function
 777       (lambda (fil)
 778         ;; Using `concat' here copies the text also, so we can add
 779         ;; properties without problems.
 780         (let ((text (concat (aref fil 0) "\n")))
 781           (if (featurep 'xemacs)
 782               ()                        ; out of luck
 783             (add-text-properties
 784              (aref fil 1) (aref fil 2)
 785              '(mouse-face highlight
 786                help-echo "mouse-2: extract this file into a buffer")
 787              text))
 788           text)))
 789      files)))
 790   (setq archive-file-list-end (point-marker)))
 791
 792 (defun archive-alternate-display ()
 793   "Toggle alternative display.
 794 To avoid very long lines some archive mode don't show all information.
 795 This function changes the set of information shown for each files."
 796   (interactive)
 797   (setq archive-alternate-display (not archive-alternate-display))
 798   (archive-resummarize))
 799 ;; -------------------------------------------------------------------------
 800 ;; Section: Local archive copy handling
 801
 802 (defun archive-unique-fname (fname dir)
 803   "Make sure a file FNAME can be created uniquely in directory DIR.
 804
 805 If FNAME can be uniquely created in DIR, it is returned unaltered.
 806 If FNAME is something our underlying filesystem can't grok, or if another
 807 file by that name already exists in DIR, a unique new name is generated
 808 using `make-temp-file', and the generated name is returned."
 809   (let ((fullname (expand-file-name fname dir))
 810         (alien (string-match file-name-invalid-regexp fname)))
 811     (if (or alien (file-exists-p fullname))
 812         (make-temp-file
 813          (expand-file-name
 814           (if (if (fboundp 'msdos-long-file-names)
 815                   (not (msdos-long-file-names)))
 816               "am"
 817             "arc-mode.")
 818           dir))
 819       fullname)))
 820
 821 (defun archive-maybe-copy (archive)
 822   (let ((coding-system-for-write 'no-conversion))
 823     (if archive-remote
 824         (let ((start (point-max))
 825               ;; Sometimes ARCHIVE is invalid while its actual name, as
 826               ;; recorded in its parent archive, is not.  For example, an
 827               ;; archive bar.zip inside another archive foo.zip gets a name
 828               ;; "foo.zip:bar.zip", which is invalid on DOS/Windows.
 829               ;; So use the actual name if available.
 830               (archive-name
 831                (or (and archive-subfile-mode (aref archive-subfile-mode 0))
 832                    archive)))
 833           (make-directory archive-tmpdir t)
 834           ;; If ARCHIVE includes leading directories, make sure they
 835           ;; exist under archive-tmpdir.
 836           (let ((arch-dir (file-name-directory archive)))
 837             (if arch-dir
 838                 (make-directory (concat
 839                                  (file-name-as-directory archive-tmpdir)
 840                                  arch-dir)
 841                                 t)))
 842           (setq archive-local-name
 843                 (archive-unique-fname archive-name archive-tmpdir))
 844           (save-restriction
 845             (widen)
 846             (write-region start (point-max) archive-local-name nil 'nomessage))
 847           archive-local-name)
 848       (if (buffer-modified-p) (save-buffer))
 849       archive)))
 850
 851 (defun archive-maybe-update (unchanged)
 852   (if archive-remote
 853       (let ((name archive-local-name)
 854             (modified (buffer-modified-p))
 855             (coding-system-for-read 'no-conversion)
 856             (lno (archive-get-lineno))
 857             buffer-read-only)
 858         (if unchanged nil
 859           (setq archive-files nil)
 860           (erase-buffer)
 861           (insert-file-contents name)
 862           (archive-mode t)
 863           (goto-char archive-file-list-start)
 864           (archive-next-line lno))
 865         (archive-delete-local name)
 866         (if (not unchanged)
 867             (message
 868              "Buffer `%s' must be saved for changes to take effect"
 869              (buffer-name (current-buffer))))
 870         (set-buffer-modified-p (or modified (not unchanged))))))
 871
 872 (defun archive-delete-local (name)
 873   "Delete file NAME and its parents up to and including `archive-tmpdir'."
 874   (let ((again t)
 875         (top (directory-file-name (file-name-as-directory archive-tmpdir))))
 876     (condition-case nil
 877         (delete-file name)
 878       (error nil))
 879     (while again
 880       (setq name (directory-file-name (file-name-directory name)))
 881       (condition-case nil
 882           (delete-directory name)
 883         (error nil))
 884       (if (string= name top) (setq again nil)))))
 885 ;; -------------------------------------------------------------------------
 886 ;; Section: Member extraction
 887
 888 (defun archive-file-name-handler (op &rest args)
 889   (or (eq op 'file-exists-p)
 890       (let ((file-name-handler-alist nil))
 891         (apply op args))))
 892
 893 (defun archive-set-buffer-as-visiting-file (filename)
 894   "Set the current buffer as if it were visiting FILENAME."
 895   (save-excursion
 896     (goto-char (point-min))
 897     (let ((coding
 898            (or coding-system-for-read
 899                (and set-auto-coding-function
 900                     (save-excursion
 901                       (funcall set-auto-coding-function
 902                                filename (- (point-max) (point-min)))))
 903                ;; dos-w32.el defines find-operation-coding-system for
 904                ;; DOS/Windows systems which preserves the coding-system
 905                ;; of existing files.  We want it to act here as if the
 906                ;; extracted file existed.
 907                (let ((file-name-handler-alist
 908                       '(("" . archive-file-name-handler))))
 909                  (car (find-operation-coding-system 'insert-file-contents
 910                                                     filename t))))))
 911       (if (and (not coding-system-for-read)
 912                (not enable-multibyte-characters))
 913           (setq coding
 914                 (coding-system-change-text-conversion coding 'raw-text)))
 915       (if (and coding
 916                (not (eq coding 'no-conversion)))
 917           (decode-coding-region (point-min) (point-max) coding)
 918         (setq last-coding-system-used coding))
 919       (set-buffer-modified-p nil)
 920       (kill-local-variable 'buffer-file-coding-system)
 921       (after-insert-file-set-coding (- (point-max) (point-min))))))
 922
 923 (defun archive-mouse-extract (event)
 924   "Extract a file whose name you click on."
 925   (interactive "e")
 926   (mouse-set-point event)
 927   (switch-to-buffer
 928    (save-excursion
 929      (archive-extract)
 930      (current-buffer))))
 931
 932 (defun archive-extract (&optional other-window-p)
 933   "In archive mode, extract this entry of the archive into its own buffer."
 934   (interactive)
 935   (let* ((view-p (eq other-window-p 'view))
 936          (descr (archive-get-descr))
 937          (ename (aref descr 0))
 938          (iname (aref descr 1))
 939          (archive-buffer (current-buffer))
 940          (arcdir default-directory)
 941          (archive (buffer-file-name))
 942          (arcname (file-name-nondirectory archive))
 943          (bufname (concat (file-name-nondirectory iname) " (" arcname ")"))
 944          (extractor (archive-name "extract"))
 945          ;; Members with file names which aren't valid for the
 946          ;; underlying filesystem, are treated as read-only.
 947          (read-only-p (or archive-read-only
 948                           view-p
 949                           (string-match file-name-invalid-regexp ename)))
 950          (buffer (get-buffer bufname))
 951          (just-created nil)
 952          (file-name-coding archive-file-name-coding-system))
 953       (if buffer
 954           nil
 955         (setq archive (archive-maybe-copy archive))
 956         (setq buffer (get-buffer-create bufname))
 957         (setq just-created t)
 958         (save-excursion
 959           (set-buffer buffer)
 960           (setq buffer-file-name
 961                 (expand-file-name (concat arcname ":" iname)))
 962           (setq buffer-file-truename
 963                 (abbreviate-file-name buffer-file-name))
 964           ;; Set the default-directory to the dir of the superior buffer.
 965           (setq default-directory arcdir)
 966           (make-local-variable 'archive-superior-buffer)
 967           (setq archive-superior-buffer archive-buffer)
 968           (make-local-variable 'local-write-file-hooks)
 969           (add-hook 'local-write-file-hooks 'archive-write-file-member)
 970           (setq archive-subfile-mode descr)
 971           (setq archive-file-name-coding-system file-name-coding)
 972           (if (and
 973                (null
 974                 (let (;; We may have to encode file name arguement for
 975                       ;; external programs.
 976                       (coding-system-for-write
 977                        (and enable-multibyte-characters
 978                             archive-file-name-coding-system))
 979                       ;; We read an archive member by no-conversion at
 980                       ;; first, then decode appropriately by calling
 981                       ;; archive-set-buffer-as-visiting-file later.
 982                       (coding-system-for-read 'no-conversion))
 983                   (condition-case err
 984                       (if (fboundp extractor)
 985                           (funcall extractor archive ename)
 986                         (archive-*-extract archive ename
 987                                            (symbol-value extractor)))
 988                     (error
 989                      (ding (message "%s" (error-message-string err)))
 990                      nil))))
 991                just-created)
 992               (progn
 993                 (set-buffer-modified-p nil)
 994                 (kill-buffer buffer))
 995             (archive-set-buffer-as-visiting-file ename)
 996             (goto-char (point-min))
 997             (rename-buffer bufname)
 998             (setq buffer-read-only read-only-p)
 999             (setq buffer-undo-list nil)
1000             (set-buffer-modified-p nil)
1001             (setq buffer-saved-size (buffer-size))
1002             (normal-mode)
1003             ;; Just in case an archive occurs inside another archive.
1004             (if (eq major-mode 'archive-mode)
1005                 (progn
1006                   (setq archive-remote t)
1007                   (if read-only-p (setq archive-read-only t))
1008                   ;; We will write out the archive ourselves if it is
1009                   ;; part of another archive.
1010                   (remove-hook 'write-contents-hooks 'archive-write-file t)))
1011             (run-hooks 'archive-extract-hooks)
1012             (if archive-read-only
1013                 (message "Note: altering this archive is not implemented."))))
1014         (archive-maybe-update t))
1015       (or (not (buffer-name buffer))
1016           (progn
1017             (if view-p
1018                 (view-buffer buffer (and just-created 'kill-buffer))
1019               (if (eq other-window-p 'display)
1020                   (display-buffer buffer)
1021                 (if other-window-p
1022                     (switch-to-buffer-other-window buffer)
1023                   (switch-to-buffer buffer))))))))
1024
1025 (defun archive-*-extract (archive name command)
1026   (let* ((default-directory (file-name-as-directory archive-tmpdir))
1027          (tmpfile (expand-file-name (file-name-nondirectory name)
1028                                     default-directory))
1029          exit-status success)
1030     (make-directory (directory-file-name default-directory) t)
1031     (setq exit-status
1032           (apply 'call-process
1033                  (car command)
1034                  nil
1035                  nil
1036                  nil
1037                  (append (cdr command) (list archive name))))
1038     (cond ((and (numberp exit-status) (= exit-status 0))
1039            (if (not (file-exists-p tmpfile))
1040                (ding (message "`%s': no such file or directory" tmpfile))
1041              (insert-file-contents tmpfile)
1042              (setq success t)))
1043           ((numberp exit-status)
1044            (ding
1045             (message "`%s' exited with status %d" (car command) exit-status)))
1046           ((stringp exit-status)
1047            (ding (message "`%s' aborted: %s" (car command) exit-status)))
1048           (t
1049            (ding (message "`%s' failed" (car command)))))
1050     (archive-delete-local tmpfile)
1051     success))
1052
1053 (defun archive-extract-by-stdout (archive name command)
1054   (apply 'call-process
1055          (car command)
1056          nil
1057          t
1058          nil
1059          (append (cdr command) (list archive name))))
1060
1061 (defun archive-extract-other-window ()
1062   "In archive mode, find this member in another window."
1063   (interactive)
1064   (archive-extract t))
1065
1066 (defun archive-display-other-window ()
1067   "In archive mode, display this member in another window."
1068   (interactive)
1069   (archive-extract 'display))
1070
1071 (defun archive-view ()
1072   "In archive mode, view the member on this line."
1073   (interactive)
1074   (archive-extract 'view))
1075
1076 (defun archive-add-new-member (arcbuf name)
1077   "Add current buffer to the archive in ARCBUF naming it NAME."
1078   (interactive
1079    (list (get-buffer
1080           (read-buffer "Buffer containing archive: "
1081                        ;; Find first archive buffer and suggest that
1082                        (let ((bufs (buffer-list)))
1083                          (while (and bufs (not (eq (save-excursion
1084                                                      (set-buffer (car bufs))
1085                                                      major-mode)
1086                                                    'archive-mode)))
1087                            (setq bufs (cdr bufs)))
1088                          (if bufs
1089                              (car bufs)
1090                            (error "There are no archive buffers")))
1091                        t))
1092          (read-string "File name in archive: "
1093                       (if buffer-file-name
1094                           (file-name-nondirectory buffer-file-name)
1095                         ""))))
1096   (save-excursion
1097     (set-buffer arcbuf)
1098     (or (eq major-mode 'archive-mode)
1099         (error "Buffer is not an archive buffer"))
1100     (if archive-read-only
1101         (error "Archive is read-only")))
1102   (if (eq arcbuf (current-buffer))
1103       (error "An archive buffer cannot be added to itself"))
1104   (if (string= name "")
1105       (error "Archive members may not be given empty names"))
1106   (let ((func (save-excursion (set-buffer arcbuf)
1107                               (archive-name "add-new-member")))
1108         (membuf (current-buffer)))
1109     (if (fboundp func)
1110         (save-excursion
1111           (set-buffer arcbuf)
1112           (funcall func buffer-file-name membuf name))
1113       (error "Adding a new member is not supported for this archive type"))))
1114 ;; -------------------------------------------------------------------------
1115 ;; Section: IO stuff
1116
1117 (defun archive-write-file-member ()
1118   (save-excursion
1119     (save-restriction
1120       (message "Updating archive...")
1121       (widen)
1122       (let ((writer  (save-excursion (set-buffer archive-superior-buffer)
1123                                      (archive-name "write-file-member")))
1124             (archive (save-excursion (set-buffer archive-superior-buffer)
1125                                      (archive-maybe-copy (buffer-file-name)))))
1126         (if (fboundp writer)
1127             (funcall writer archive archive-subfile-mode)
1128           (archive-*-write-file-member archive
1129                                        archive-subfile-mode
1130                                        (symbol-value writer)))
1131         (set-buffer-modified-p nil)
1132         (message "Updating archive...done"))
1133       (set-buffer archive-superior-buffer)
1134       (if (not archive-remote) (revert-buffer) (archive-maybe-update nil))))
1135   ;; Restore the value of last-coding-system-used, so that basic-save-buffer
1136   ;; won't reset the coding-system of this archive member.
1137   (if (local-variable-p 'archive-member-coding-system)
1138       (setq last-coding-system-used archive-member-coding-system))
1139   t)
1140
1141 (defun archive-*-write-file-member (archive descr command)
1142   (let* ((ename (aref descr 0))
1143          (tmpfile (expand-file-name ename archive-tmpdir))
1144          (top (directory-file-name (file-name-as-directory archive-tmpdir)))
1145          (default-directory (file-name-as-directory top)))
1146     (unwind-protect
1147         (progn
1148           (make-directory (file-name-directory tmpfile) t)
1149           ;; If the member is itself an archive, write it without
1150           ;; the dired-like listing we created.
1151           (if (eq major-mode 'archive-mode)
1152               (archive-write-file tmpfile)
1153             (write-region (point-min) (point-max) tmpfile nil 'nomessage))
1154           ;; basic-save-buffer needs last-coding-system-used to have
1155           ;; the value used to write the file, so save it before any
1156           ;; further processing clobbers it (we restore it in
1157           ;; archive-write-file-member, above).
1158           (setq archive-member-coding-system last-coding-system-used)
1159           (if (aref descr 3)
1160               ;; Set the file modes, but make sure we can read it.
1161               (set-file-modes tmpfile (logior ?\400 (aref descr 3))))
1162           (setq ename
1163                 (encode-coding-string ename archive-file-name-coding-system))
1164           (let* ((coding-system-for-write 'no-conversion)
1165                  (exitcode (apply 'call-process
1166                                   (car command)
1167                                   nil
1168                                   nil
1169                                   nil
1170                                   (append (cdr command)
1171                                           (list archive ename)))))
1172             (if (equal exitcode 0)
1173                 nil
1174               (error "Updating was unsuccessful (%S)" exitcode))))
1175       (archive-delete-local tmpfile))))
1176
1177 (defun archive-write-file (&optional file)
1178   (save-excursion
1179     (let ((coding-system-for-write 'no-conversion))
1180       (write-region archive-proper-file-start (point-max)
1181                     (or file buffer-file-name) nil t)
1182       (set-buffer-modified-p nil))
1183     t))
1184 ;; -------------------------------------------------------------------------
1185 ;; Section: Marking and unmarking.
1186
1187 (defun archive-flag-deleted (p &optional type)
1188   "In archive mode, mark this member to be deleted from the archive.
1189 With a prefix argument, mark that many files."
1190   (interactive "p")
1191   (or type (setq type ?D))
1192   (beginning-of-line)
1193   (let ((sign (if (>= p 0) +1 -1))
1194         (modified (buffer-modified-p))
1195         buffer-read-only)
1196     (while (not (zerop p))
1197       (if (archive-get-descr t)
1198           (progn
1199             (delete-char 1)
1200             (insert type)))
1201       (forward-line sign)
1202       (setq p (- p sign)))
1203     (set-buffer-modified-p modified))
1204   (archive-next-line 0))
1205
1206 (defun archive-unflag (p)
1207   "In archive mode, un-mark this member if it is marked to be deleted.
1208 With a prefix argument, un-mark that many files forward."
1209   (interactive "p")
1210   (archive-flag-deleted p ? ))
1211
1212 (defun archive-unflag-backwards (p)
1213   "In archive mode, un-mark this member if it is marked to be deleted.
1214 With a prefix argument, un-mark that many members backward."
1215   (interactive "p")
1216   (archive-flag-deleted (- p) ? ))
1217
1218 (defun archive-unmark-all-files ()
1219   "Remove all marks."
1220   (interactive)
1221   (let ((modified (buffer-modified-p))
1222         buffer-read-only)
1223     (save-excursion
1224       (goto-char archive-file-list-start)
1225       (while (< (point) archive-file-list-end)
1226         (or (= (following-char) ? )
1227             (progn (delete-char 1) (insert ? )))
1228         (forward-line 1)))
1229     (set-buffer-modified-p modified)))
1230
1231 (defun archive-mark (p)
1232   "In archive mode, mark this member for group operations.
1233 With a prefix argument, mark that many members.
1234 Use \\[archive-unmark-all-files] to remove all marks."
1235   (interactive "p")
1236   (archive-flag-deleted p ?*))
1237
1238 (defun archive-get-marked (mark &optional default)
1239   (let (files)
1240     (save-excursion
1241       (goto-char archive-file-list-start)
1242       (while (< (point) archive-file-list-end)
1243         (if (= (following-char) mark)
1244             (setq files (cons (archive-get-descr) files)))
1245         (forward-line 1)))
1246     (or (nreverse files)
1247         (and default
1248              (list (archive-get-descr))))))
1249 ;; -------------------------------------------------------------------------
1250 ;; Section: Operate
1251
1252 (defun archive-next-line (p)
1253   (interactive "p")
1254   (forward-line p)
1255   (or (eobp)
1256       (forward-char archive-file-name-indent)))
1257
1258 (defun archive-previous-line (p)
1259   (interactive "p")
1260   (archive-next-line (- p)))
1261
1262 (defun archive-chmod-entry (new-mode)
1263   "Change the protection bits associated with all marked or this member.
1264 The new protection bits can either be specified as an octal number or
1265 as a relative change like \"g+rw\" as for chmod(2)"
1266   (interactive "sNew mode (octal or relative): ")
1267   (if archive-read-only (error "Archive is read-only"))
1268   (let ((func (archive-name "chmod-entry")))
1269     (if (fboundp func)
1270         (progn
1271           (funcall func new-mode (archive-get-marked ?* t))
1272           (archive-resummarize))
1273       (error "Setting mode bits is not supported for this archive type"))))
1274
1275 (defun archive-chown-entry (new-uid)
1276   "Change the owner of all marked or this member."
1277   (interactive "nNew uid: ")
1278   (if archive-read-only (error "Archive is read-only"))
1279   (let ((func (archive-name "chown-entry")))
1280     (if (fboundp func)
1281         (progn
1282           (funcall func new-uid (archive-get-marked ?* t))
1283           (archive-resummarize))
1284       (error "Setting owner is not supported for this archive type"))))
1285
1286 (defun archive-chgrp-entry (new-gid)
1287   "Change the group of all marked or this member."
1288   (interactive "nNew gid: ")
1289   (if archive-read-only (error "Archive is read-only"))
1290   (let ((func (archive-name "chgrp-entry")))
1291     (if (fboundp func)
1292         (progn
1293           (funcall func new-gid (archive-get-marked ?* t))
1294           (archive-resummarize))
1295       (error "Setting group is not supported for this archive type"))))
1296
1297 (defun archive-expunge ()
1298   "Do the flagged deletions."
1299   (interactive)
1300   (let (files)
1301     (save-excursion
1302       (goto-char archive-file-list-start)
1303       (while (< (point) archive-file-list-end)
1304         (if (= (following-char) ?D)
1305             (setq files (cons (aref (archive-get-descr) 0) files)))
1306         (forward-line 1)))
1307     (setq files (nreverse files))
1308     (and files
1309          (or (not archive-read-only)
1310              (error "Archive is read-only"))
1311          (or (yes-or-no-p (format "Really delete %d member%s? "
1312                                   (length files)
1313                                   (if (null (cdr files)) "" "s")))
1314              (error "Operation aborted"))
1315          (let ((archive (archive-maybe-copy (buffer-file-name)))
1316                (expunger (archive-name "expunge")))
1317            (if (fboundp expunger)
1318                (funcall expunger archive files)
1319              (archive-*-expunge archive files (symbol-value expunger)))
1320            (archive-maybe-update nil)
1321            (if archive-remote
1322                (archive-resummarize)
1323              (revert-buffer))))))
1324
1325 (defun archive-*-expunge (archive files command)
1326   (apply 'call-process
1327          (car command)
1328          nil
1329          nil
1330          nil
1331          (append (cdr command) (cons archive files))))
1332
1333 (defun archive-rename-entry (newname)
1334   "Change the name associated with this entry in the tar file."
1335   (interactive "sNew name: ")
1336   (if archive-read-only (error "Archive is read-only"))
1337   (if (string= newname "")
1338       (error "Archive members may not be given empty names"))
1339   (let ((func (archive-name "rename-entry"))
1340         (descr (archive-get-descr)))
1341     (if (fboundp func)
1342         (progn
1343           (funcall func (buffer-file-name)
1344                    (encode-coding-string newname
1345                                          archive-file-name-coding-system)
1346                    descr)
1347           (archive-resummarize))
1348       (error "Renaming is not supported for this archive type"))))
1349
1350 ;; Revert the buffer and recompute the dired-like listing.
1351 (defun archive-mode-revert (&optional no-auto-save no-confirm)
1352   (let ((no (archive-get-lineno)))
1353     (setq archive-files nil)
1354     (let ((revert-buffer-function nil)
1355           (coding-system-for-read 'no-conversion))
1356       (revert-buffer t t))
1357     (archive-mode)
1358     (goto-char archive-file-list-start)
1359     (archive-next-line no)))
1360
1361 (defun archive-undo ()
1362   "Undo in an archive buffer.
1363 This doesn't recover lost files, it just undoes changes in the buffer itself."
1364   (interactive)
1365   (let (buffer-read-only)
1366     (undo)))
1367 ;; -------------------------------------------------------------------------
1368 ;; Section: Arc Archives
1369
1370 (defun archive-arc-summarize ()
1371   (let ((p 1)
1372         (totalsize 0)
1373         (maxlen 8)
1374         files
1375         visual)
1376     (while (and (< (+ p 29) (point-max))
1377                 (= (byte-after p) ?\C-z)
1378                 (> (byte-after (1+ p)) 0))
1379       (let* ((namefld (buffer-substring (+ p 2) (+ p 2 13)))
1380              (fnlen   (or (string-match "\0" namefld) 13))
1381              (efnname (decode-coding-string (substring namefld 0 fnlen)
1382                                             archive-file-name-coding-system))
1383              (csize   (archive-l-e (+ p 15) 4))
1384              (moddate (archive-l-e (+ p 19) 2))
1385              (modtime (archive-l-e (+ p 21) 2))
1386              (ucsize  (archive-l-e (+ p 25) 4))
1387              (fiddle  (string= efnname (upcase efnname)))
1388              (ifnname (if fiddle (downcase efnname) efnname))
1389              (text    (format "  %8d  %-11s  %-8s  %s"
1390                               ucsize
1391                               (archive-dosdate moddate)
1392                               (archive-dostime modtime)
1393                               ifnname)))
1394         (setq maxlen (max maxlen fnlen)
1395               totalsize (+ totalsize ucsize)
1396               visual (cons (vector text
1397                                    (- (length text) (length ifnname))
1398                                    (length text))
1399                            visual)
1400               files (cons (vector efnname ifnname fiddle nil (1- p))
1401                           files)
1402               p (+ p 29 csize))))
1403     (goto-char (point-min))
1404     (let ((dash (concat "- --------  -----------  --------  "
1405                         (make-string maxlen ?-)
1406                         "\n")))
1407       (insert "M   Length  Date         Time      File\n"
1408               dash)
1409       (archive-summarize-files (nreverse visual))
1410       (insert dash
1411               (format "  %8d                         %d file%s"
1412                       totalsize
1413                       (length files)
1414                       (if (= 1 (length files)) "" "s"))
1415               "\n"))
1416     (apply 'vector (nreverse files))))
1417
1418 (defun archive-arc-rename-entry (archive newname descr)
1419   (if (string-match "[:\\\\/]" newname)
1420       (error "File names in arc files must not contain a directory component"))
1421   (if (> (length newname) 12)
1422       (error "File names in arc files are limited to 12 characters"))
1423   (let ((name (concat newname (substring "\0\0\0\0\0\0\0\0\0\0\0\0\0"
1424                                          (length newname))))
1425         buffer-read-only)
1426     (save-restriction
1427       (save-excursion
1428         (widen)
1429         (goto-char (+ archive-proper-file-start (aref descr 4) 2))
1430         (delete-char 13)
1431         (insert-unibyte name)))))
1432 ;; -------------------------------------------------------------------------
1433 ;; Section: Lzh Archives
1434
1435 (defun archive-lzh-summarize ()
1436   (let ((p 1)
1437         (totalsize 0)
1438         (maxlen 8)
1439         files
1440         visual)
1441     (while (progn (goto-char p)         ;beginning of a base header.
1442                   (looking-at "\\(.\\|\n\\)\\(.\\|\n\\)-l[hz][0-9ds]-"))
1443       (let* ((hsize   (byte-after p))   ;size of the base header (level 0 and 1)
1444              (csize   (archive-l-e (+ p 7) 4)) ;size of a compressed file to follow (level 0 and 2),
1445                                         ;size of extended headers + the compressed file to follow (level 1).
1446              (ucsize  (archive-l-e (+ p 11) 4)) ;size of an uncompressed file.
1447              (time1   (archive-l-e (+ p 15) 2)) ;date/time (MSDOS format in level 0, 1 headers
1448              (time2   (archive-l-e (+ p 17) 2)) ;and UNIX format in level 2 header.)
1449              (hdrlvl  (byte-after (+ p 20))) ;header level
1450              thsize             ;total header size (base + extensions)
1451              fnlen efnname fiddle ifnname width p2 creator
1452              neh        ;beginning of next extension header (level 1 and 2)
1453              mode modestr uid gid text dir prname
1454              gname uname modtime moddate)
1455         (if (= hdrlvl 3) (error "can't handle lzh level 3 header type"))
1456         (when (or (= hdrlvl 0) (= hdrlvl 1))
1457           (setq fnlen   (byte-after (+ p 21))) ;filename length
1458           (setq efnname (let ((str (buffer-substring (+ p 22) (+ p 22 fnlen)))) ;filename from offset 22
1459                         (decode-coding-string
1460                          str archive-file-name-coding-system)))
1461           (setq p2      (+ p 22 fnlen))) ;
1462         (if (= hdrlvl 1)
1463             (progn              ;specific to level 1 header
1464               (setq creator (if (>= (- hsize fnlen) 24) (byte-after (+ p2 2)) 0))
1465               (setq neh (+ p2 3)))
1466           (if (= hdrlvl 2)
1467               (progn            ;specific to level 2 header
1468                 (setq creator (byte-after (+ p 23)) )
1469                 (setq neh (+ p 24)))))
1470         (if neh         ;if level 1 or 2 we expect extension headers to follow
1471             (let* ((ehsize (archive-l-e neh 2)) ;size of the extension header
1472                    (etype (byte-after (+ neh 2)))) ;extension type
1473               (while (not (= ehsize 0))
1474                   (cond
1475                  ((= etype 1)   ;file name
1476                   (let ((i (+ neh 3)))
1477                     (while (< i (+ neh ehsize))
1478                       (setq efnname (concat efnname (char-to-string (byte-after i))))
1479                       (setq i (1+ i)))))
1480                  ((= etype 2)   ;directory name
1481                   (let ((i (+ neh 3)))
1482                     (while (< i (+ neh ehsize))
1483                                     (setq dir (concat dir
1484                                                        (if (= (byte-after i)
1485                                                               255)
1486                                                            "/"
1487                                                          (char-to-string
1488                                                           (char-after i)))))
1489                                     (setq i (1+ i)))))
1490                  ((= etype 80)          ;Unix file permission
1491                   (setq mode (archive-l-e (+ neh 3) 2)))
1492                  ((= etype 81)          ;UNIX file group/user ID
1493                   (progn (setq uid (archive-l-e (+ neh 3) 2))
1494                          (setq gid (archive-l-e (+ neh 5) 2))))
1495                  ((= etype 82)          ;UNIX file group name
1496                   (let ((i (+ neh 3)))
1497                     (while (< i (+ neh ehsize))
1498                       (setq gname (concat gname (char-to-string (char-after i))))
1499                       (setq i (1+ i)))))
1500                  ((= etype 83)          ;UNIX file user name
1501                   (let ((i (+ neh 3)))
1502                     (while (< i (+ neh ehsize))
1503                       (setq uname (concat uname (char-to-string (char-after i))))
1504                       (setq i (1+ i)))))
1505                    )
1506                 (setq neh (+ neh ehsize))
1507                 (setq ehsize (archive-l-e neh 2))
1508                 (setq etype (byte-after (+ neh 2))))
1509               ;;get total header size for level 1 and 2 headers
1510               (setq thsize (- neh p))))
1511         (if (= hdrlvl 0)  ;total header size
1512             (setq thsize hsize))
1513         (setq fiddle  (if efnname (string= efnname (upcase efnname))))
1514         (setq ifnname (if fiddle (downcase efnname) efnname))
1515         (setq prname (if dir (concat dir ifnname) ifnname))
1516         (setq width (if prname (string-width prname) 0))
1517         (setq modestr (if mode (archive-int-to-mode mode) "??????????"))
1518         (setq moddate (if (= hdrlvl 2)
1519                           (archive-unixdate time1 time2) ;level 2 header in UNIX format
1520                         (archive-dosdate time2))) ;level 0 and 1 header in DOS format
1521         (setq modtime (if (= hdrlvl 2)
1522                           (archive-unixtime time1 time2)
1523                         (archive-dostime time1)))
1524         (setq text    (if archive-alternate-display
1525                           (format "  %8d  %5S  %5S  %s"
1526                                   ucsize
1527                                   (or uid "?")
1528                                   (or gid "?")
1529                                   ifnname)
1530                         (format "  %10s  %8d  %-11s  %-8s  %s"
1531                                 modestr
1532                                 ucsize
1533                                 moddate
1534                                 modtime
1535                                 prname)))
1536         (setq maxlen (max maxlen width)
1537               totalsize (+ totalsize ucsize)
1538               visual (cons (vector text
1539                                    (- (length text) (length prname))
1540                                    (length text))
1541                            visual)
1542               files (cons (vector prname ifnname fiddle mode (1- p))
1543                           files))
1544         (cond ((= hdrlvl 1)
1545                (setq p (+ p hsize 2 csize)))
1546               ((or (= hdrlvl 2) (= hdrlvl 0))
1547                (setq p (+ p thsize 2 csize))))
1548         ))
1549     (goto-char (point-min))
1550     (let ((dash (concat (if archive-alternate-display
1551                             "- --------  -----  -----  "
1552                           "- ----------  --------  -----------  --------  ")
1553                         (make-string maxlen ?-)
1554                         "\n"))
1555           (header (if archive-alternate-display
1556                        "M   Length    Uid    Gid  File\n"
1557                     "M   Filemode    Length  Date         Time      File\n"))
1558           (sumline (if archive-alternate-display
1559                        "  %8d                %d file%s"
1560                      "              %8d                         %d file%s")))
1561       (insert header dash)
1562       (archive-summarize-files (nreverse visual))
1563       (insert dash
1564               (format sumline
1565                       totalsize
1566                       (length files)
1567                       (if (= 1 (length files)) "" "s"))
1568               "\n"))
1569     (apply 'vector (nreverse files))))
1570
1571 (defconst archive-lzh-alternate-display t)
1572
1573 (defun archive-lzh-extract (archive name)
1574   (archive-extract-by-stdout archive name archive-lzh-extract))
1575
1576 (defun archive-lzh-resum (p count)
1577   (let ((sum 0))
1578     (while (> count 0)
1579       (setq count (1- count)
1580             sum (+ sum (byte-after p))
1581             p (1+ p)))
1582     (logand sum 255)))
1583
1584 (defun archive-lzh-rename-entry (archive newname descr)
1585   (save-restriction
1586     (save-excursion
1587       (widen)
1588       (let* ((p        (+ archive-proper-file-start (aref descr 4)))
1589              (oldhsize (byte-after p))
1590              (oldfnlen (byte-after (+ p 21)))
1591              (newfnlen (length newname))
1592              (newhsize (+ oldhsize newfnlen (- oldfnlen)))
1593              buffer-read-only)
1594         (if (> newhsize 255)
1595             (error "The file name is too long"))
1596         (goto-char (+ p 21))
1597         (delete-char (1+ oldfnlen))
1598         (insert-unibyte newfnlen newname)
1599         (goto-char p)
1600         (delete-char 2)
1601         (insert-unibyte newhsize (archive-lzh-resum p newhsize))))))
1602
1603 (defun archive-lzh-ogm (newval files errtxt ofs)
1604   (save-restriction
1605     (save-excursion
1606       (widen)
1607       (while files
1608         (let* ((fil (car files))
1609                (p (+ archive-proper-file-start (aref fil 4)))
1610                (hsize   (byte-after p))
1611                (fnlen   (byte-after (+ p 21)))
1612                (p2      (+ p 22 fnlen))
1613                (creator (if (>= (- hsize fnlen) 24) (byte-after (+ p2 2)) 0))
1614                buffer-read-only)
1615           (if (= creator ?U)
1616               (progn
1617                 (or (numberp newval)
1618                     (setq newval (funcall newval (archive-l-e (+ p2 ofs) 2))))
1619                 (goto-char (+ p2 ofs))
1620                 (delete-char 2)
1621                 (insert-unibyte (logand newval 255) (lsh newval -8))
1622                 (goto-char (1+ p))
1623                 (delete-char 1)
1624                 (insert-unibyte (archive-lzh-resum (1+ p) hsize)))
1625             (message "Member %s does not have %s field"
1626                      (aref fil 1) errtxt)))
1627         (setq files (cdr files))))))
1628
1629 (defun archive-lzh-chown-entry (newuid files)
1630   (archive-lzh-ogm newuid files "an uid" 10))
1631
1632 (defun archive-lzh-chgrp-entry (newgid files)
1633   (archive-lzh-ogm newgid files "a gid" 12))
1634
1635 (defun archive-lzh-chmod-entry (newmode files)
1636   (archive-lzh-ogm
1637    ;; This should work even though newmode will be dynamically accessed.
1638    (function (lambda (old) (archive-calc-mode old newmode t)))
1639    files "a unix-style mode" 8))
1640 ;; -------------------------------------------------------------------------
1641 ;; Section: Zip Archives
1642
1643 (defun archive-zip-summarize ()
1644   (goto-char (- (point-max) (- 22 18)))
1645   (search-backward-regexp "[P]K\005\006")
1646   (let ((p (+ (point-min) (archive-l-e (+ (point) 16) 4)))
1647         (maxlen 8)
1648         (totalsize 0)
1649         files
1650         visual)
1651     (while (string= "PK\001\002" (buffer-substring p (+ p 4)))
1652       (let* ((creator (byte-after (+ p 5)))
1653              (method  (archive-l-e (+ p 10) 2))
1654              (modtime (archive-l-e (+ p 12) 2))
1655              (moddate (archive-l-e (+ p 14) 2))
1656              (ucsize  (archive-l-e (+ p 24) 4))
1657              (fnlen   (archive-l-e (+ p 28) 2))
1658              (exlen   (archive-l-e (+ p 30) 2))
1659              (fclen   (archive-l-e (+ p 32) 2))
1660              (lheader (archive-l-e (+ p 42) 4))
1661              (efnname (let ((str (buffer-substring (+ p 46) (+ p 46 fnlen))))
1662                         (decode-coding-string
1663                          str archive-file-name-coding-system)))
1664              (isdir   (and (= ucsize 0)
1665                            (string= (file-name-nondirectory efnname) "")))
1666              (mode    (cond ((memq creator '(2 3)) ; Unix + VMS
1667                              (archive-l-e (+ p 40) 2))
1668                             ((memq creator '(0 5 6 7 10 11 15)) ; Dos etc.
1669                              (logior ?\444
1670                                      (if isdir (logior 16384 ?\111) 0)
1671                                      (if (zerop
1672                                           (logand 1 (byte-after (+ p 38))))
1673                                          ?\222 0)))
1674                             (t nil)))
1675              (modestr (if mode (archive-int-to-mode mode) "??????????"))
1676              (fiddle  (and archive-zip-case-fiddle
1677                            (not (not (memq creator '(0 2 4 5 9))))
1678                            (string= (upcase efnname) efnname)))
1679              (ifnname (if fiddle (downcase efnname) efnname))
1680              (width (string-width ifnname))
1681              (text    (format "  %10s  %8d  %-11s  %-8s  %s"
1682                               modestr
1683                               ucsize
1684                               (archive-dosdate moddate)
1685                               (archive-dostime modtime)
1686                               ifnname)))
1687         (setq maxlen (max maxlen width)
1688               totalsize (+ totalsize ucsize)
1689               visual (cons (vector text
1690                                    (- (length text) (length ifnname))
1691                                    (length text))
1692                            visual)
1693               files (cons (if isdir
1694                               nil
1695                             (vector efnname ifnname fiddle mode
1696                                     (list (1- p) lheader)))
1697                           files)
1698               p (+ p 46 fnlen exlen fclen))))
1699     (goto-char (point-min))
1700     (let ((dash (concat "- ----------  --------  -----------  --------  "
1701                         (make-string maxlen ?-)
1702                         "\n")))
1703       (insert "M Filemode      Length  Date         Time      File\n"
1704               dash)
1705       (archive-summarize-files (nreverse visual))
1706       (insert dash
1707               (format "              %8d                         %d file%s"
1708                       totalsize
1709                       (length files)
1710                       (if (= 1 (length files)) "" "s"))
1711               "\n"))
1712     (apply 'vector (nreverse files))))
1713
1714 (defun archive-zip-extract (archive name)
1715   (if (equal (car archive-zip-extract) "pkzip")
1716       (archive-*-extract archive name archive-zip-extract)
1717     (archive-extract-by-stdout archive name archive-zip-extract)))
1718
1719 (defun archive-zip-write-file-member (archive descr)
1720   (archive-*-write-file-member
1721    archive
1722    descr
1723    (if (aref descr 2) archive-zip-update-case archive-zip-update)))
1724
1725 (defun archive-zip-chmod-entry (newmode files)
1726   (save-restriction
1727     (save-excursion
1728       (widen)
1729       (while files
1730         (let* ((fil (car files))
1731                (p (+ archive-proper-file-start (car (aref fil 4))))
1732                (creator (byte-after (+ p 5)))
1733                (oldmode (aref fil 3))
1734                (newval  (archive-calc-mode oldmode newmode t))
1735                buffer-read-only)
1736           (cond ((memq creator '(2 3)) ; Unix + VMS
1737                  (goto-char (+ p 40))
1738                  (delete-char 2)
1739                  (insert-unibyte (logand newval 255) (lsh newval -8)))
1740                 ((memq creator '(0 5 6 7 10 11 15)) ; Dos etc.
1741                  (goto-char (+ p 38))
1742                  (insert-unibyte (logior (logand (byte-after (point)) 254)
1743                                          (logand (logxor 1 (lsh newval -7)) 1)))
1744                  (delete-char 1))
1745                 (t (message "Don't know how to change mode for this member"))))
1746         (setq files (cdr files))))))
1747 ;; -------------------------------------------------------------------------
1748 ;; Section: Zoo Archives
1749
1750 (defun archive-zoo-summarize ()
1751   (let ((p (1+ (archive-l-e 25 4)))
1752         (maxlen 8)
1753         (totalsize 0)
1754         files
1755         visual)
1756     (while (and (string= "\334\247\304\375" (buffer-substring p (+ p 4)))
1757                 (> (archive-l-e (+ p 6) 4) 0))
1758       (let* ((next    (1+ (archive-l-e (+ p 6) 4)))
1759              (moddate (archive-l-e (+ p 14) 2))
1760              (modtime (archive-l-e (+ p 16) 2))
1761              (ucsize  (archive-l-e (+ p 20) 4))
1762              (namefld (buffer-substring (+ p 38) (+ p 38 13)))
1763              (dirtype (byte-after (+ p 4)))
1764              (lfnlen  (if (= dirtype 2) (byte-after (+ p 56)) 0))
1765              (ldirlen (if (= dirtype 2) (byte-after (+ p 57)) 0))
1766              (fnlen   (or (string-match "\0" namefld) 13))
1767              (efnname (let ((str
1768                              (concat
1769                               (if (> ldirlen 0)
1770                                   (concat (buffer-substring
1771                                            (+ p 58 lfnlen)
1772                                            (+ p 58 lfnlen ldirlen -1))
1773                                           "/")
1774                                 "")
1775                               (if (> lfnlen 0)
1776                                   (buffer-substring (+ p 58)
1777                                                     (+ p 58 lfnlen -1))
1778                                 (substring namefld 0 fnlen)))))
1779                         (decode-coding-string
1780                          str archive-file-name-coding-system)))
1781              (fiddle  (and (= lfnlen 0) (string= efnname (upcase efnname))))
1782              (ifnname (if fiddle (downcase efnname) efnname))
1783              (width (string-width ifnname))
1784              (text    (format "  %8d  %-11s  %-8s  %s"
1785                               ucsize
1786                               (archive-dosdate moddate)
1787                               (archive-dostime modtime)
1788                               ifnname)))
1789         (setq maxlen (max maxlen width)
1790               totalsize (+ totalsize ucsize)
1791               visual (cons (vector text
1792                                    (- (length text) (length ifnname))
1793                                    (length text))
1794                            visual)
1795               files (cons (vector efnname ifnname fiddle nil (1- p))
1796                           files)
1797               p next)))
1798     (goto-char (point-min))
1799     (let ((dash (concat "- --------  -----------  --------  "
1800                         (make-string maxlen ?-)
1801                         "\n")))
1802       (insert "M   Length  Date         Time      File\n"
1803               dash)
1804       (archive-summarize-files (nreverse visual))
1805       (insert dash
1806               (format "  %8d                         %d file%s"
1807                       totalsize
1808                       (length files)
1809                       (if (= 1 (length files)) "" "s"))
1810               "\n"))
1811     (apply 'vector (nreverse files))))
1812
1813 (defun archive-zoo-extract (archive name)
1814   (archive-extract-by-stdout archive name archive-zoo-extract))
1815 ;; -------------------------------------------------------------------------
1816 ;; This line was a mistake; it is kept now for compatibility.
1817 ;; rms  15 Oct 98
1818 (provide 'archive-mode)
1819
1820 (provide 'arc-mode)
1821
1822 ;; arch-tag: e5966a01-35ec-4f27-8095-a043a79b457b
1823 ;;; arc-mode.el ends here