code.delx.au - gnu-emacs/blob - lisp/arc-mode.el

   1 ;;; arc-mode.el --- simple editing of archives
   2
   3 ;; Copyright (C) 1995, 1997, 1998, 2001, 2002, 2003, 2004,
   4 ;;   2005, 2006, 2007 Free Software Foundation, Inc.
   5
   6 ;; Author: Morten Welinder <terra@gnu.org>
   7 ;; Keywords: archives msdog editing major-mode
   8 ;; Favourite-brand-of-beer: None, I hate beer.
   9
  10 ;; This file is part of GNU Emacs.
  11
  12 ;; GNU Emacs is free software; you can redistribute it and/or modify
  13 ;; it under the terms of the GNU General Public License as published by
  14 ;; the Free Software Foundation; either version 2, or (at your option)
  15 ;; any later version.
  16
  17 ;; GNU Emacs is distributed in the hope that it will be useful,
  18 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 ;; GNU General Public License for more details.
  21
  22 ;; You should have received a copy of the GNU General Public License
  23 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  24 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  25 ;; Boston, MA 02110-1301, USA.
  26
  27 ;;; Commentary:
  28
  29 ;; NAMING: "arc" is short for "archive" and does not refer specifically
  30 ;; to files whose name end in ".arc"
  31 ;;
  32 ;; This code does not decode any files internally, although it does
  33 ;; understand the directory level of the archives.  For this reason,
  34 ;; you should expect this code to need more fiddling than tar-mode.el
  35 ;; (although it at present has fewer bugs :-)  In particular, I have
  36 ;; not tested this under Ms-Dog myself.
  37 ;; -------------------------------------
  38 ;; INTERACTION: arc-mode.el should play together with
  39 ;;
  40 ;; * ange-ftp.el: Remote archives (i.e., ones that ange-ftp has brought
  41 ;;                to you) are handled by doing all updates on a local
  42 ;;                copy.  When you make changes to a remote file the
  43 ;;                changes will first take effect when the archive buffer
  44 ;;                is saved.  You will be warned about this.
  45 ;;
  46 ;; * dos-fns.el:  (Part of Emacs 19).  You get automatic ^M^J <--> ^J
  47 ;;                conversion.
  48 ;;
  49 ;; arc-mode.el does not work well with crypt++.el; for the archives as
  50 ;; such this could be fixed (but wouldn't be useful) by declaring such
  51 ;; archives to be "remote".  For the members this is a general Emacs
  52 ;; problem that 19.29's file formats may fix.
  53 ;; -------------------------------------
  54 ;; ARCHIVE TYPES: Currently only the archives below are handled, but the
  55 ;; structure for handling just about anything is in place.
  56 ;;
  57 ;;                        Arc     Lzh     Zip     Zoo
  58 ;;                        --------------------------------
  59 ;; View listing           Intern  Intern  Intern  Intern
  60 ;; Extract member         Y       Y       Y       Y
  61 ;; Save changed member    Y       Y       Y       Y
  62 ;; Add new member         N       N       N       N
  63 ;; Delete member          Y       Y       Y       Y
  64 ;; Rename member          Y       Y       N       N
  65 ;; Chmod                  -       Y       Y       -
  66 ;; Chown                  -       Y       -       -
  67 ;; Chgrp                  -       Y       -       -
  68 ;;
  69 ;; Special thanks to Bill Brodie <wbrodie@panix.com> for very useful tips
  70 ;; on the first released version of this package.
  71 ;;
  72 ;; This code is partly based on tar-mode.el from Emacs.
  73 ;; -------------------------------------
  74 ;; ARCHIVE STRUCTURES:
  75 ;; (This is mostly for myself.)
  76 ;;
  77 ;; ARC         A series of (header,file).  No interactions among members.
  78 ;;
  79 ;; LZH         A series of (header,file).  Headers are checksummed.  No
  80 ;;             interaction among members.
  81 ;;             Headers come in three flavours called level 0, 1 and 2 headers.
  82 ;;             Level 2 header is free of DOS specific restrictions and most
  83 ;;             prevalently used.  Also level 1 and 2 headers consist of base
  84 ;;             and extension headers.  For more details see
  85 ;;             http://homepage1.nifty.com/dangan/en/Content/Program/Java/jLHA/Notes/Notes.html
  86 ;;             http://www.osirusoft.com/joejared/lzhformat.html
  87 ;;
  88 ;; ZIP         A series of (lheader,fil) followed by a "central directory"
  89 ;;             which is a series of (cheader) followed by an end-of-
  90 ;;             central-dir record possibly followed by junk.  The e-o-c-d
  91 ;;             links to c-d.  cheaders link to lheaders which are basically
  92 ;;             cut-down versions of the cheaders.
  93 ;;
  94 ;; ZOO         An archive header followed by a series of (header,file).
  95 ;;             Each member header points to the next.  The archive is
  96 ;;             terminated by a bogus header with a zero next link.
  97 ;; -------------------------------------
  98 ;; HOOKS: `foo' means one of the supported archive types.
  99 ;;
 100 ;; archive-mode-hook
 101 ;; archive-foo-mode-hook
 102 ;; archive-extract-hooks
 103
 104 ;;; Code:
 105
 106 ;; -------------------------------------------------------------------------
 107 ;; Section: Configuration.
 108
 109 (defgroup archive nil
 110   "Simple editing of archives."
 111   :group 'data)
 112
 113 (defgroup archive-arc nil
 114   "ARC-specific options to archive."
 115   :group 'archive)
 116
 117 (defgroup archive-lzh nil
 118   "LZH-specific options to archive."
 119   :group 'archive)
 120
 121 (defgroup archive-zip nil
 122   "ZIP-specific options to archive."
 123   :group 'archive)
 124
 125 (defgroup archive-zoo nil
 126   "ZOO-specific options to archive."
 127   :group 'archive)
 128
 129 (defcustom archive-tmpdir
 130   ;; make-temp-name is safe here because we use this name
 131   ;; to create a directory.
 132   (make-temp-name
 133    (expand-file-name (if (eq system-type 'ms-dos) "ar" "archive.tmp")
 134                      temporary-file-directory))
 135   "Directory for temporary files made by `arc-mode.el'."
 136   :type 'directory
 137   :group 'archive)
 138
 139 (defcustom archive-remote-regexp "^/[^/:]*[^/:.]:"
 140   "*Regexp recognizing archive files names that are not local.
 141 A non-local file is one whose file name is not proper outside Emacs.
 142 A local copy of the archive will be used when updating."
 143   :type 'regexp
 144   :group 'archive)
 145
 146 (defcustom archive-extract-hooks nil
 147   "*Hooks to run when an archive member has been extracted."
 148   :type 'hook
 149   :group 'archive)
 150 ;; ------------------------------
 151 ;; Arc archive configuration
 152
 153 ;; We always go via a local file since there seems to be no reliable way
 154 ;; to extract to stdout without junk getting added.
 155 (defcustom archive-arc-extract
 156   '("arc" "x")
 157   "*Program and its options to run in order to extract an arc file member.
 158 Extraction should happen to the current directory.  Archive and member
 159 name will be added."
 160   :type '(list (string :tag "Program")
 161                 (repeat :tag "Options"
 162                         :inline t
 163                         (string :format "%v")))
 164   :group 'archive-arc)
 165
 166 (defcustom archive-arc-expunge
 167   '("arc" "d")
 168   "*Program and its options to run in order to delete arc file members.
 169 Archive and member names will be added."
 170   :type '(list (string :tag "Program")
 171                 (repeat :tag "Options"
 172                         :inline t
 173                         (string :format "%v")))
 174   :group 'archive-arc)
 175
 176 (defcustom archive-arc-write-file-member
 177   '("arc" "u")
 178   "*Program and its options to run in order to update an arc file member.
 179 Archive and member name will be added."
 180   :type '(list (string :tag "Program")
 181                 (repeat :tag "Options"
 182                         :inline t
 183                         (string :format "%v")))
 184   :group 'archive-arc)
 185 ;; ------------------------------
 186 ;; Lzh archive configuration
 187
 188 (defcustom archive-lzh-extract
 189   '("lha" "pq")
 190   "*Program and its options to run in order to extract an lzh file member.
 191 Extraction should happen to standard output.  Archive and member name will
 192 be added."
 193   :type '(list (string :tag "Program")
 194                 (repeat :tag "Options"
 195                         :inline t
 196                         (string :format "%v")))
 197   :group 'archive-lzh)
 198
 199 (defcustom archive-lzh-expunge
 200   '("lha" "d")
 201   "*Program and its options to run in order to delete lzh file members.
 202 Archive and member names will be added."
 203   :type '(list (string :tag "Program")
 204                 (repeat :tag "Options"
 205                         :inline t
 206                         (string :format "%v")))
 207   :group 'archive-lzh)
 208
 209 (defcustom archive-lzh-write-file-member
 210   '("lha" "a")
 211   "*Program and its options to run in order to update an lzh file member.
 212 Archive and member name will be added."
 213   :type '(list (string :tag "Program")
 214                 (repeat :tag "Options"
 215                         :inline t
 216                         (string :format "%v")))
 217   :group 'archive-lzh)
 218 ;; ------------------------------
 219 ;; Zip archive configuration
 220
 221 (defcustom archive-zip-extract
 222   (if (and (not (executable-find "unzip"))
 223            (executable-find "pkunzip"))
 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."
 229   :type '(list (string :tag "Program")
 230                 (repeat :tag "Options"
 231                         :inline t
 232                         (string :format "%v")))
 233   :group 'archive-zip)
 234
 235 ;; For several reasons the latter behaviour is not desirable in general.
 236 ;; (1) It uses more disk space.  (2) Error checking is worse or non-
 237 ;; existent.  (3) It tends to do funny things with other systems' file
 238 ;; names.
 239
 240 (defcustom archive-zip-expunge
 241   (if (and (not (executable-find "zip"))
 242            (executable-find "pkzip"))
 243       '("pkzip" "-d")
 244     '("zip" "-d" "-q"))
 245   "*Program and its options to run in order to delete zip file members.
 246 Archive and member names will be added."
 247   :type '(list (string :tag "Program")
 248                 (repeat :tag "Options"
 249                         :inline t
 250                         (string :format "%v")))
 251   :group 'archive-zip)
 252
 253 (defcustom archive-zip-update
 254   (if (and (not (executable-find "zip"))
 255            (executable-find "pkzip"))
 256       '("pkzip" "-u" "-P")
 257     '("zip" "-q"))
 258   "*Program and its options to run in order to update a zip file member.
 259 Options should ensure that specified directory will be put into the zip
 260 file.  Archive and member name will be added."
 261   :type '(list (string :tag "Program")
 262                 (repeat :tag "Options"
 263                         :inline t
 264                         (string :format "%v")))
 265   :group 'archive-zip)
 266
 267 (defcustom archive-zip-update-case
 268   (if (and (not (executable-find "zip"))
 269            (executable-find "pkzip"))
 270       '("pkzip" "-u" "-P")
 271     '("zip" "-q" "-k"))
 272   "*Program and its options to run in order to update a case fiddled zip member.
 273 Options should ensure that specified directory will be put into the zip file.
 274 Archive and member name will be added."
 275   :type '(list (string :tag "Program")
 276                 (repeat :tag "Options"
 277                         :inline t
 278                         (string :format "%v")))
 279   :group 'archive-zip)
 280
 281 (defcustom archive-zip-case-fiddle t
 282   "*If non-nil then zip file members may be down-cased.
 283 This case fiddling will only happen for members created by a system
 284 that uses caseless file names."
 285   :type 'boolean
 286   :group 'archive-zip)
 287 ;; ------------------------------
 288 ;; Zoo archive configuration
 289
 290 (defcustom archive-zoo-extract
 291   '("zoo" "xpq")
 292   "*Program and its options to run in order to extract a zoo file member.
 293 Extraction should happen to standard output.  Archive and member name will
 294 be added."
 295   :type '(list (string :tag "Program")
 296                 (repeat :tag "Options"
 297                         :inline t
 298                         (string :format "%v")))
 299   :group 'archive-zoo)
 300
 301 (defcustom archive-zoo-expunge
 302   '("zoo" "DqPP")
 303   "*Program and its options to run in order to delete zoo file members.
 304 Archive and member names will be added."
 305   :type '(list (string :tag "Program")
 306                 (repeat :tag "Options"
 307                         :inline t
 308                         (string :format "%v")))
 309   :group 'archive-zoo)
 310
 311 (defcustom archive-zoo-write-file-member
 312   '("zoo" "a")
 313   "*Program and its options to run in order to update a zoo file member.
 314 Archive and member name will be added."
 315   :type '(list (string :tag "Program")
 316                 (repeat :tag "Options"
 317                         :inline t
 318                         (string :format "%v")))
 319   :group 'archive-zoo)
 320 ;; -------------------------------------------------------------------------
 321 ;; Section: Variables
 322
 323 (defvar archive-subtype nil "Symbol describing archive type.")
 324 (defvar archive-file-list-start nil "Position of first contents line.")
 325 (defvar archive-file-list-end nil "Position just after last contents line.")
 326 (defvar archive-proper-file-start nil "Position of real archive's start.")
 327 (defvar archive-read-only nil "Non-nil if the archive is read-only on disk.")
 328 (defvar archive-local-name nil "Name of local copy of remote archive.")
 329 (defvar archive-mode-map
 330   (let ((map (make-keymap)))
 331     (suppress-keymap map)
 332     (define-key map " " 'archive-next-line)
 333     (define-key map "a" 'archive-alternate-display)
 334     ;;(define-key map "c" 'archive-copy)
 335     (define-key map "d" 'archive-flag-deleted)
 336     (define-key map "\C-d" 'archive-flag-deleted)
 337     (define-key map "e" 'archive-extract)
 338     (define-key map "f" 'archive-extract)
 339     (define-key map "\C-m" 'archive-extract)
 340     (define-key map "g" 'revert-buffer)
 341     (define-key map "h" 'describe-mode)
 342     (define-key map "m" 'archive-mark)
 343     (define-key map "n" 'archive-next-line)
 344     (define-key map "\C-n" 'archive-next-line)
 345     (define-key map [down] 'archive-next-line)
 346     (define-key map "o" 'archive-extract-other-window)
 347     (define-key map "p" 'archive-previous-line)
 348     (define-key map "q" 'quit-window)
 349     (define-key map "\C-p" 'archive-previous-line)
 350     (define-key map [up] 'archive-previous-line)
 351     (define-key map "r" 'archive-rename-entry)
 352     (define-key map "u" 'archive-unflag)
 353     (define-key map "\M-\C-?" 'archive-unmark-all-files)
 354     (define-key map "v" 'archive-view)
 355     (define-key map "x" 'archive-expunge)
 356     (define-key map "\177" 'archive-unflag-backwards)
 357     (define-key map "E" 'archive-extract-other-window)
 358     (define-key map "M" 'archive-chmod-entry)
 359     (define-key map "G" 'archive-chgrp-entry)
 360     (define-key map "O" 'archive-chown-entry)
 361
 362     (if (fboundp 'command-remapping)
 363         (progn
 364           (define-key map [remap advertised-undo] 'archive-undo)
 365           (define-key map [remap undo] 'archive-undo))
 366       (substitute-key-definition 'advertised-undo 'archive-undo map global-map)
 367       (substitute-key-definition 'undo 'archive-undo map global-map))
 368
 369     (define-key map
 370       (if (featurep 'xemacs) 'button2 [mouse-2]) 'archive-extract)
 371
 372     (if (featurep 'xemacs)
 373         ()                              ; out of luck
 374
 375       (define-key map [menu-bar immediate]
 376         (cons "Immediate" (make-sparse-keymap "Immediate")))
 377       (define-key map [menu-bar immediate alternate]
 378         '(menu-item "Alternate Display" archive-alternate-display
 379           :enable (boundp (archive-name "alternate-display"))
 380           :help "Toggle alternate file info display"))
 381       (define-key map [menu-bar immediate view]
 382         '(menu-item "View This File" archive-view
 383           :help "Display file at cursor in View Mode"))
 384       (define-key map [menu-bar immediate display]
 385         '(menu-item "Display in Other Window" archive-display-other-window
 386           :help "Display file at cursor in another window"))
 387       (define-key map [menu-bar immediate find-file-other-window]
 388         '(menu-item "Find in Other Window" archive-extract-other-window
 389           :help "Edit file at cursor in another window"))
 390       (define-key map [menu-bar immediate find-file]
 391         '(menu-item "Find This File" archive-extract
 392           :help "Extract file at cursor and edit it"))
 393
 394       (define-key map [menu-bar mark]
 395         (cons "Mark" (make-sparse-keymap "Mark")))
 396       (define-key map [menu-bar mark unmark-all]
 397         '(menu-item "Unmark All" archive-unmark-all-files
 398           :help "Unmark all marked files"))
 399       (define-key map [menu-bar mark deletion]
 400         '(menu-item "Flag" archive-flag-deleted
 401           :help "Flag file at cursor for deletion"))
 402       (define-key map [menu-bar mark unmark]
 403         '(menu-item "Unflag" archive-unflag
 404           :help "Unmark file at cursor"))
 405       (define-key map [menu-bar mark mark]
 406         '(menu-item "Mark" archive-mark
 407           :help "Mark file at cursor"))
 408
 409       (define-key map [menu-bar operate]
 410         (cons "Operate" (make-sparse-keymap "Operate")))
 411       (define-key map [menu-bar operate chown]
 412         '(menu-item "Change Owner..." archive-chown-entry
 413           :enable (fboundp (archive-name "chown-entry"))
 414           :help "Change owner of marked files"))
 415       (define-key map [menu-bar operate chgrp]
 416         '(menu-item "Change Group..." archive-chgrp-entry
 417           :enable (fboundp (archive-name "chgrp-entry"))
 418           :help "Change group ownership of marked files"))
 419       (define-key map [menu-bar operate chmod]
 420         '(menu-item "Change Mode..." archive-chmod-entry
 421           :enable (fboundp (archive-name "chmod-entry"))
 422           :help "Change mode (permissions) of marked files"))
 423       (define-key map [menu-bar operate rename]
 424         '(menu-item "Rename to..." archive-rename-entry
 425           :enable (fboundp (archive-name "rename-entry"))
 426           :help "Rename marked files"))
 427       ;;(define-key map [menu-bar operate copy]
 428       ;;  '(menu-item "Copy to..." archive-copy))
 429       (define-key map [menu-bar operate expunge]
 430         '(menu-item "Expunge Marked Files" archive-expunge
 431           :help "Delete all flagged files from archive"))
 432       map))
 433   "Local keymap for archive mode listings.")
 434 (defvar archive-file-name-indent nil "Column where file names start.")
 435
 436 (defvar archive-remote nil "Non-nil if the archive is outside file system.")
 437 (make-variable-buffer-local 'archive-remote)
 438 (put 'archive-remote 'permanent-local t)
 439
 440 (defvar archive-member-coding-system nil "Coding-system of archive member.")
 441 (make-variable-buffer-local 'archive-member-coding-system)
 442
 443 (defvar archive-alternate-display nil
 444   "Non-nil when alternate information is shown.")
 445 (make-variable-buffer-local 'archive-alternate-display)
 446 (put 'archive-alternate-display 'permanent-local t)
 447
 448 (defvar archive-superior-buffer nil "In archive members, points to archive.")
 449 (put 'archive-superior-buffer 'permanent-local t)
 450
 451 (defvar archive-subfile-mode nil "Non-nil in archive member buffers.")
 452 (make-variable-buffer-local 'archive-subfile-mode)
 453 (put 'archive-subfile-mode 'permanent-local t)
 454
 455 (defvar archive-file-name-coding-system nil)
 456 (make-variable-buffer-local 'archive-file-name-coding-system)
 457 (put 'archive-file-name-coding-system 'permanent-local t)
 458
 459 (defvar archive-files nil
 460   "Vector of file descriptors.
 461 Each descriptor is a vector of the form
 462  [EXT-FILE-NAME INT-FILE-NAME CASE-FIDDLED MODE ...]")
 463 (make-variable-buffer-local 'archive-files)
 464
 465 ;; -------------------------------------------------------------------------
 466 ;; Section: Support functions.
 467
 468 (eval-when-compile
 469   (defsubst byte-after (pos)
 470     "Like char-after but an eight-bit char is converted to unibyte."
 471     (multibyte-char-to-unibyte (char-after pos)))
 472   (defsubst insert-unibyte (&rest args)
 473     "Like insert but don't make unibyte string and eight-bit char multibyte."
 474     (dolist (elt args)
 475       (if (integerp elt)
 476           (insert (if (< elt 128) elt (decode-char 'eight-bit elt)))
 477         (insert (string-to-multibyte elt)))))
 478   )
 479
 480 (defsubst archive-name (suffix)
 481   (intern (concat "archive-" (symbol-name archive-subtype) "-" suffix)))
 482
 483 (defun archive-l-e (str &optional len float)
 484   "Convert little endian string/vector STR to integer.
 485 Alternatively, STR may be a buffer position in the current buffer
 486 in which case a second argument, length LEN, should be supplied.
 487 FLOAT, if non-nil, means generate and return a float instead of an integer
 488 \(use this for numbers that can overflow the Emacs integer)."
 489   (if (stringp str)
 490       (setq len (length str))
 491     (setq str (buffer-substring str (+ str len))))
 492   (setq str (string-as-unibyte str))
 493   (let ((result 0)
 494         (i 0))
 495     (while (< i len)
 496       (setq i (1+ i)
 497             result (+ (if float (* result 256.0) (ash result 8))
 498                       (aref str (- len i)))))
 499     result))
 500
 501 (defun archive-int-to-mode (mode)
 502   "Turn an integer like 0700 (i.e., 448) into a mode string like -rwx------."
 503   ;; FIXME: merge with tar-grind-file-mode.
 504   (string
 505     (if (zerop (logand  8192 mode))
 506         (if (zerop (logand 16384 mode)) ?- ?d)
 507       ?c) ; completeness
 508     (if (zerop (logand   256 mode)) ?- ?r)
 509     (if (zerop (logand   128 mode)) ?- ?w)
 510     (if (zerop (logand    64 mode))
 511         (if (zerop (logand  1024 mode)) ?- ?S)
 512       (if (zerop (logand  1024 mode)) ?x ?s))
 513     (if (zerop (logand    32 mode)) ?- ?r)
 514     (if (zerop (logand    16 mode)) ?- ?w)
 515     (if (zerop (logand     8 mode))
 516         (if (zerop (logand  2048 mode)) ?- ?S)
 517       (if (zerop (logand  2048 mode)) ?x ?s))
 518     (if (zerop (logand     4 mode)) ?- ?r)
 519     (if (zerop (logand     2 mode)) ?- ?w)
 520     (if (zerop (logand     1 mode)) ?- ?x)))
 521
 522 (defun archive-calc-mode (oldmode newmode &optional error)
 523   "From the integer OLDMODE and the string NEWMODE calculate a new file mode.
 524 NEWMODE may be an octal number including a leading zero in which case it
 525 will become the new mode.\n
 526 NEWMODE may also be a relative specification like \"og-rwx\" in which case
 527 OLDMODE will be modified accordingly just like chmod(2) would have done.\n
 528 If optional third argument ERROR is non-nil an error will be signaled if
 529 the mode is invalid.  If ERROR is nil then nil will be returned."
 530   (cond ((string-match "^0[0-7]*$" newmode)
 531          (let ((result 0)
 532                (len (length newmode))
 533                (i 1))
 534            (while (< i len)
 535              (setq result (+ (lsh result 3) (aref newmode i) (- ?0))
 536                    i (1+ i)))
 537            (logior (logand oldmode 65024) result)))
 538         ((string-match "^\\([agou]+\\)\\([---+=]\\)\\([rwxst]+\\)$" newmode)
 539          (let ((who 0)
 540                (result oldmode)
 541                (op (aref newmode (match-beginning 2)))
 542                (bits 0)
 543                (i (match-beginning 3)))
 544            (while (< i (match-end 3))
 545              (let ((rwx (aref newmode i)))
 546                (setq bits (logior bits (cond ((= rwx ?r)  292)
 547                                              ((= rwx ?w)  146)
 548                                              ((= rwx ?x)   73)
 549                                              ((= rwx ?s) 3072)
 550                                              ((= rwx ?t)  512)))
 551                      i (1+ i))))
 552            (while (< who (match-end 1))
 553              (let* ((whoc (aref newmode who))
 554                     (whomask (cond ((= whoc ?a) 4095)
 555                                    ((= whoc ?u) 1472)
 556                                    ((= whoc ?g) 2104)
 557                                    ((= whoc ?o)    7))))
 558                (if (= op ?=)
 559                    (setq result (logand result (lognot whomask))))
 560                (if (= op ?-)
 561                    (setq result (logand result (lognot (logand whomask bits))))
 562                  (setq result (logior result (logand whomask bits)))))
 563              (setq who (1+ who)))
 564            result))
 565         (t
 566          (if error
 567              (error "Invalid mode specification: %s" newmode)))))
 568
 569 (defun archive-dosdate (date)
 570   "Stringify dos packed DATE record."
 571   (let ((year (+ 1980 (logand (ash date -9) 127)))
 572         (month (logand (ash date -5) 15))
 573         (day (logand date 31)))
 574     (if (or (> month 12) (< month 1))
 575         ""
 576       (format "%2d-%s-%d"
 577               day
 578               (aref ["Jan" "Feb" "Mar" "Apr" "May" "Jun"
 579                      "Jul" "Aug" "Sep" "Oct" "Nov" "Dec"] (1- month))
 580               year))))
 581
 582 (defun archive-dostime (time)
 583   "Stringify dos packed TIME record."
 584   (let ((hour (logand (ash time -11) 31))
 585         (minute (logand (ash time -5) 63))
 586         (second (* 2 (logand time 31)))) ; 2 seconds resolution
 587     (format "%02d:%02d:%02d" hour minute second)))
 588
 589 (defun archive-unixdate (low high)
 590   "Stringify Unix (LOW HIGH) date."
 591   (let ((str (current-time-string (cons high low))))
 592     (format "%s-%s-%s"
 593             (substring str 8 10)
 594             (substring str 4 7)
 595             (substring str 20 24))))
 596
 597 (defun archive-unixtime (low high)
 598   "Stringify Unix (LOW HIGH) time."
 599   (let ((str (current-time-string (cons high low))))
 600     (substring str 11 19)))
 601
 602 (defun archive-get-lineno ()
 603   (if (>= (point) archive-file-list-start)
 604       (count-lines archive-file-list-start
 605                    (save-excursion (beginning-of-line) (point)))
 606     0))
 607
 608 (defun archive-get-descr (&optional noerror)
 609   "Return the descriptor vector for file at point.
 610 Does not signal an error if optional argument NOERROR is non-nil."
 611   (let ((no (archive-get-lineno)))
 612     (if (and (>= (point) archive-file-list-start)
 613              (< no (length archive-files)))
 614         (let ((item (aref archive-files no)))
 615           (if (vectorp item)
 616               item
 617             (if (not noerror)
 618                 (error "Entry is not a regular member of the archive"))))
 619       (if (not noerror)
 620           (error "Line does not describe a member of the archive")))))
 621 ;; -------------------------------------------------------------------------
 622 ;; Section: the mode definition
 623
 624 ;;;###autoload
 625 (defun archive-mode (&optional force)
 626   "Major mode for viewing an archive file in a dired-like way.
 627 You can move around using the usual cursor motion commands.
 628 Letters no longer insert themselves.
 629 Type `e' to pull a file out of the archive and into its own buffer;
 630 or click mouse-2 on the file's line in the archive mode buffer.
 631
 632 If you edit a sub-file of this archive (as with the `e' command) and
 633 save it, the contents of that buffer will be saved back into the
 634 archive.
 635
 636 \\{archive-mode-map}"
 637   ;; This is not interactive because you shouldn't be turning this
 638   ;; mode on and off.  You can corrupt things that way.
 639   (if (zerop (buffer-size))
 640       ;; At present we cannot create archives from scratch
 641       (funcall default-major-mode)
 642     (if (and (not force) archive-files) nil
 643       (let* ((type (archive-find-type))
 644              (typename (capitalize (symbol-name type))))
 645         (kill-all-local-variables)
 646         (make-local-variable 'archive-subtype)
 647         (setq archive-subtype type)
 648
 649         ;; Buffer contains treated image of file before the file contents
 650         (make-local-variable 'revert-buffer-function)
 651         (setq revert-buffer-function 'archive-mode-revert)
 652         (auto-save-mode 0)
 653
 654         ;; Remote archives are not written by a hook.
 655         (if archive-remote nil
 656           (add-hook 'write-contents-functions 'archive-write-file nil t))
 657
 658         (make-local-variable 'require-final-newline)
 659         (setq require-final-newline nil)
 660         (make-local-variable 'local-enable-local-variables)
 661         (setq local-enable-local-variables nil)
 662
 663         ;; Prevent loss of data when saving the file.
 664         (make-local-variable 'file-precious-flag)
 665         (setq file-precious-flag t)
 666
 667         (make-local-variable 'archive-read-only)
 668         ;; Archives which are inside other archives and whose
 669         ;; names are invalid for this OS, can't be written.
 670         (setq archive-read-only
 671               (or (not (file-writable-p (buffer-file-name)))
 672                   (and archive-subfile-mode
 673                        (string-match file-name-invalid-regexp
 674                                      (aref archive-subfile-mode 0)))))
 675
 676         ;; Should we use a local copy when accessing from outside Emacs?
 677         (make-local-variable 'archive-local-name)
 678
 679         ;; An archive can contain another archive whose name is invalid
 680         ;; on local filesystem.  Treat such archives as remote.
 681         (or archive-remote
 682             (setq archive-remote
 683                   (or (string-match archive-remote-regexp (buffer-file-name))
 684                       (string-match file-name-invalid-regexp
 685                                     (buffer-file-name)))))
 686
 687         (setq major-mode 'archive-mode)
 688         (setq mode-name (concat typename "-Archive"))
 689         ;; Run archive-foo-mode-hook and archive-mode-hook
 690         (run-mode-hooks (archive-name "mode-hook") 'archive-mode-hook)
 691         (use-local-map archive-mode-map))
 692
 693       (make-local-variable 'archive-proper-file-start)
 694       (make-local-variable 'archive-file-list-start)
 695       (make-local-variable 'archive-file-list-end)
 696       (make-local-variable 'archive-file-name-indent)
 697       (setq archive-file-name-coding-system
 698             (or file-name-coding-system
 699                 default-file-name-coding-system
 700                 locale-coding-system))
 701       (if default-enable-multibyte-characters
 702           (set-buffer-multibyte 'to))
 703       (archive-summarize nil)
 704       (setq buffer-read-only t))))
 705
 706 ;; Archive mode is suitable only for specially formatted data.
 707 (put 'archive-mode 'mode-class 'special)
 708
 709 (let ((item1 '(archive-subfile-mode " Archive")))
 710   (or (member item1 minor-mode-alist)
 711       (setq minor-mode-alist (cons item1 minor-mode-alist))))
 712 ;; -------------------------------------------------------------------------
 713 (defun archive-find-type ()
 714   (widen)
 715   (goto-char (point-min))
 716   ;; The funny [] here make it unlikely that the .elc file will be treated
 717   ;; as an archive by other software.
 718   (let (case-fold-search)
 719     (cond ((looking-at "[P]K\003\004") 'zip)
 720           ((looking-at "..-l[hz][0-9ds]-") 'lzh)
 721           ((looking-at "....................[\334]\247\304\375") 'zoo)
 722           ((and (looking-at "\C-z")     ; signature too simple, IMHO
 723                 (string-match "\\.[aA][rR][cC]$"
 724                               (or buffer-file-name (buffer-name))))
 725            'arc)
 726           (t (error "Buffer format not recognized")))))
 727 ;; -------------------------------------------------------------------------
 728 (defun archive-summarize (&optional shut-up)
 729   "Parse the contents of the archive file in the current buffer.
 730 Place a dired-like listing on the front;
 731 then narrow to it, so that only that listing
 732 is visible (and the real data of the buffer is hidden).
 733 Optional argument SHUT-UP, if non-nil, means don't print messages
 734 when parsing the archive."
 735   (widen)
 736   (let ((inhibit-read-only t))
 737     (or shut-up
 738         (message "Parsing archive file..."))
 739     (buffer-disable-undo (current-buffer))
 740     (setq archive-files (funcall (archive-name "summarize")))
 741     (or shut-up
 742         (message "Parsing archive file...done."))
 743     (setq archive-proper-file-start (point-marker))
 744     (narrow-to-region (point-min) (point))
 745     (set-buffer-modified-p nil)
 746     (buffer-enable-undo))
 747   (goto-char archive-file-list-start)
 748   (archive-next-line 0))
 749
 750 (defun archive-resummarize ()
 751   "Recreate the contents listing of an archive."
 752   (let ((modified (buffer-modified-p))
 753         (no (archive-get-lineno))
 754         (inhibit-read-only t))
 755     (widen)
 756     (delete-region (point-min) archive-proper-file-start)
 757     (archive-summarize t)
 758     (restore-buffer-modified-p modified)
 759     (goto-char archive-file-list-start)
 760     (archive-next-line no)))
 761
 762 (defun archive-summarize-files (files)
 763   "Insert a description of a list of files annotated with proper mouse face."
 764   (setq archive-file-list-start (point-marker))
 765   (setq archive-file-name-indent (if files (aref (car files) 1) 0))
 766   ;; We don't want to do an insert for each element since that takes too
 767   ;; long when the archive -- which has to be moved in memory -- is large.
 768   (insert
 769    (apply
 770     (function concat)
 771     (mapcar
 772      (lambda (fil)
 773        ;; Using `concat' here copies the text also, so we can add
 774        ;; properties without problems.
 775        (let ((text (concat (aref fil 0) "\n")))
 776          (if (featurep 'xemacs)
 777              ()                         ; out of luck
 778            (add-text-properties
 779             (aref fil 1) (aref fil 2)
 780             '(mouse-face highlight
 781               help-echo "mouse-2: extract this file into a buffer")
 782             text))
 783          text))
 784      files)))
 785   (setq archive-file-list-end (point-marker)))
 786
 787 (defun archive-alternate-display ()
 788   "Toggle alternative display.
 789 To avoid very long lines archive mode does not show all information.
 790 This function changes the set of information shown for each files."
 791   (interactive)
 792   (setq archive-alternate-display (not archive-alternate-display))
 793   (archive-resummarize))
 794 ;; -------------------------------------------------------------------------
 795 ;; Section: Local archive copy handling
 796
 797 (defun archive-unique-fname (fname dir)
 798   "Make sure a file FNAME can be created uniquely in directory DIR.
 799
 800 If FNAME can be uniquely created in DIR, it is returned unaltered.
 801 If FNAME is something our underlying filesystem can't grok, or if another
 802 file by that name already exists in DIR, a unique new name is generated
 803 using `make-temp-file', and the generated name is returned."
 804   (let ((fullname (expand-file-name fname dir))
 805         (alien (string-match file-name-invalid-regexp fname)))
 806     (if (or alien (file-exists-p fullname))
 807         (make-temp-file
 808          (expand-file-name
 809           (if (if (fboundp 'msdos-long-file-names)
 810                   (not (msdos-long-file-names)))
 811               "am"
 812             "arc-mode.")
 813           dir))
 814       fullname)))
 815
 816 (defun archive-maybe-copy (archive)
 817   (let ((coding-system-for-write 'no-conversion))
 818     (if archive-remote
 819         (let ((start (point-max))
 820               ;; Sometimes ARCHIVE is invalid while its actual name, as
 821               ;; recorded in its parent archive, is not.  For example, an
 822               ;; archive bar.zip inside another archive foo.zip gets a name
 823               ;; "foo.zip:bar.zip", which is invalid on DOS/Windows.
 824               ;; So use the actual name if available.
 825               (archive-name
 826                (or (and archive-subfile-mode (aref archive-subfile-mode 0))
 827                    archive)))
 828           (setq archive-local-name
 829                 (archive-unique-fname archive-name archive-tmpdir))
 830           ;; Maked sure all the leading directories in
 831           ;; archive-local-name exist under archive-tmpdir, so that
 832           ;; the directory structure recorded in the archive is
 833           ;; reconstructed in the temporary directory.
 834           (make-directory (file-name-directory archive-local-name) t)
 835           (save-restriction
 836             (widen)
 837             (write-region start (point-max) archive-local-name nil 'nomessage))
 838           archive-local-name)
 839       (if (buffer-modified-p) (save-buffer))
 840       archive)))
 841
 842 (defun archive-maybe-update (unchanged)
 843   (if archive-remote
 844       (let ((name archive-local-name)
 845             (modified (buffer-modified-p))
 846             (coding-system-for-read 'no-conversion)
 847             (lno (archive-get-lineno))
 848             (inhibit-read-only t))
 849         (if unchanged nil
 850           (setq archive-files nil)
 851           (erase-buffer)
 852           (insert-file-contents name)
 853           (archive-mode t)
 854           (goto-char archive-file-list-start)
 855           (archive-next-line lno))
 856         (archive-delete-local name)
 857         (if (not unchanged)
 858             (message
 859              "Buffer `%s' must be saved for changes to take effect"
 860              (buffer-name (current-buffer))))
 861         (set-buffer-modified-p (or modified (not unchanged))))))
 862
 863 (defun archive-delete-local (name)
 864   "Delete file NAME and its parents up to and including `archive-tmpdir'."
 865   (let ((again t)
 866         (top (directory-file-name (file-name-as-directory archive-tmpdir))))
 867     (condition-case nil
 868         (delete-file name)
 869       (error nil))
 870     (while again
 871       (setq name (directory-file-name (file-name-directory name)))
 872       (condition-case nil
 873           (delete-directory name)
 874         (error nil))
 875       (if (string= name top) (setq again nil)))))
 876 ;; -------------------------------------------------------------------------
 877 ;; Section: Member extraction
 878
 879 (defun archive-file-name-handler (op &rest args)
 880   (or (eq op 'file-exists-p)
 881       (let ((file-name-handler-alist nil))
 882         (apply op args))))
 883
 884 (defun archive-set-buffer-as-visiting-file (filename)
 885   "Set the current buffer as if it were visiting FILENAME."
 886   (save-excursion
 887     (goto-char (point-min))
 888     (let ((buffer-undo-list t)
 889           (coding
 890            (or coding-system-for-read
 891                (and set-auto-coding-function
 892                     (save-excursion
 893                       (funcall set-auto-coding-function
 894                                filename (- (point-max) (point-min)))))
 895                ;; dos-w32.el defines the function
 896                ;; find-buffer-file-type-coding-system for DOS/Windows
 897                ;; systems which preserves the coding-system of existing files.
 898                ;; (That function is called via file-coding-system-alist.)
 899                ;; Here, we want it to act as if the extracted file existed.
 900                ;; The following let-binding of file-name-handler-alist forces
 901                ;; find-file-not-found-set-buffer-file-coding-system to ignore
 902                ;; the file's name (see dos-w32.el).
 903                (let ((file-name-handler-alist
 904                       '(("" . archive-file-name-handler))))
 905                  (car (find-operation-coding-system
 906                        'insert-file-contents
 907                        (cons filename (current-buffer)) t))))))
 908       (if (and (not coding-system-for-read)
 909                (not enable-multibyte-characters))
 910           (setq coding
 911                 (coding-system-change-text-conversion coding 'raw-text)))
 912       (if (and coding
 913                (not (eq coding 'no-conversion)))
 914           (decode-coding-region (point-min) (point-max) coding)
 915         (setq last-coding-system-used coding))
 916       (set-buffer-modified-p nil)
 917       (kill-local-variable 'buffer-file-coding-system)
 918       (after-insert-file-set-coding (- (point-max) (point-min))))))
 919
 920 (define-obsolete-function-alias 'archive-mouse-extract 'archive-extract "22.1")
 921
 922 (defun archive-extract (&optional other-window-p event)
 923   "In archive mode, extract this entry of the archive into its own buffer."
 924   (interactive (list nil last-input-event))
 925   (if event (posn-set-point (event-end event)))
 926   (let* ((view-p (eq other-window-p 'view))
 927          (descr (archive-get-descr))
 928          (ename (aref descr 0))
 929          (iname (aref descr 1))
 930          (archive-buffer (current-buffer))
 931          (arcdir default-directory)
 932          (archive (buffer-file-name))
 933          (arcname (file-name-nondirectory archive))
 934          (bufname (concat (file-name-nondirectory iname) " (" arcname ")"))
 935          (extractor (archive-name "extract"))
 936          ;; Members with file names which aren't valid for the
 937          ;; underlying filesystem, are treated as read-only.
 938          (read-only-p (or archive-read-only
 939                           view-p
 940                           (string-match file-name-invalid-regexp ename)))
 941          (arcfilename (expand-file-name (concat arcname ":" iname)))
 942          (buffer (get-buffer bufname))
 943          (just-created nil)
 944          (file-name-coding archive-file-name-coding-system))
 945       (if (and buffer
 946                (string= (buffer-file-name buffer) arcfilename))
 947           nil
 948         (setq archive (archive-maybe-copy archive))
 949         (setq bufname (generate-new-buffer-name bufname))
 950         (setq buffer (get-buffer-create bufname))
 951         (setq just-created t)
 952         (with-current-buffer buffer
 953           (setq buffer-file-name arcfilename)
 954           (setq buffer-file-truename
 955                 (abbreviate-file-name buffer-file-name))
 956           ;; Set the default-directory to the dir of the superior buffer.
 957           (setq default-directory arcdir)
 958           (make-local-variable 'archive-superior-buffer)
 959           (setq archive-superior-buffer archive-buffer)
 960           (add-hook 'write-file-functions 'archive-write-file-member nil t)
 961           (setq archive-subfile-mode descr)
 962           (setq archive-file-name-coding-system file-name-coding)
 963           (if (and
 964                (null
 965                 (let (;; We may have to encode file name arguement for
 966                       ;; external programs.
 967                       (coding-system-for-write
 968                        (and enable-multibyte-characters
 969                             archive-file-name-coding-system))
 970                       ;; We read an archive member by no-conversion at
 971                       ;; first, then decode appropriately by calling
 972                       ;; archive-set-buffer-as-visiting-file later.
 973                       (coding-system-for-read 'no-conversion))
 974                   (condition-case err
 975                       (if (fboundp extractor)
 976                           (funcall extractor archive ename)
 977                         (archive-*-extract archive ename
 978                                            (symbol-value extractor)))
 979                     (error
 980                      (ding (message "%s" (error-message-string err)))
 981                      nil))))
 982                just-created)
 983               (progn
 984                 (set-buffer-modified-p nil)
 985                 (kill-buffer buffer))
 986             (archive-set-buffer-as-visiting-file ename)
 987             (goto-char (point-min))
 988             (rename-buffer bufname)
 989             (setq buffer-read-only read-only-p)
 990             (setq buffer-undo-list nil)
 991             (set-buffer-modified-p nil)
 992             (setq buffer-saved-size (buffer-size))
 993             (normal-mode)
 994             ;; Just in case an archive occurs inside another archive.
 995             (when (derived-mode-p 'archive-mode)
 996               (setq archive-remote t)
 997               (if read-only-p (setq archive-read-only t))
 998               ;; We will write out the archive ourselves if it is
 999               ;; part of another archive.
1000               (remove-hook 'write-contents-functions 'archive-write-file t))
1001             (run-hooks 'archive-extract-hooks)
1002             (if archive-read-only
1003                 (message "Note: altering this archive is not implemented."))))
1004         (archive-maybe-update t))
1005       (or (not (buffer-name buffer))
1006           (cond
1007            (view-p (view-buffer buffer (and just-created 'kill-buffer)))
1008            ((eq other-window-p 'display) (display-buffer buffer))
1009            (other-window-p (switch-to-buffer-other-window buffer))
1010            (t (switch-to-buffer buffer))))))
1011
1012 (defun archive-*-extract (archive name command)
1013   (let* ((default-directory (file-name-as-directory archive-tmpdir))
1014          (tmpfile (expand-file-name (file-name-nondirectory name)
1015                                     default-directory))
1016          exit-status success)
1017     (make-directory (directory-file-name default-directory) t)
1018     (setq exit-status
1019           (apply 'call-process
1020                  (car command)
1021                  nil
1022                  nil
1023                  nil
1024                  (append (cdr command) (list archive name))))
1025     (cond ((and (numberp exit-status) (= exit-status 0))
1026            (if (not (file-exists-p tmpfile))
1027                (ding (message "`%s': no such file or directory" tmpfile))
1028              (insert-file-contents tmpfile)
1029              (setq success t)))
1030           ((numberp exit-status)
1031            (ding
1032             (message "`%s' exited with status %d" (car command) exit-status)))
1033           ((stringp exit-status)
1034            (ding (message "`%s' aborted: %s" (car command) exit-status)))
1035           (t
1036            (ding (message "`%s' failed" (car command)))))
1037     (archive-delete-local tmpfile)
1038     success))
1039
1040 (defun archive-extract-by-stdout (archive name command)
1041   (apply 'call-process
1042          (car command)
1043          nil
1044          t
1045          nil
1046          (append (cdr command) (list archive name))))
1047
1048 (defun archive-extract-other-window ()
1049   "In archive mode, find this member in another window."
1050   (interactive)
1051   (archive-extract t))
1052
1053 (defun archive-display-other-window ()
1054   "In archive mode, display this member in another window."
1055   (interactive)
1056   (archive-extract 'display))
1057
1058 (defun archive-view ()
1059   "In archive mode, view the member on this line."
1060   (interactive)
1061   (archive-extract 'view))
1062
1063 (defun archive-add-new-member (arcbuf name)
1064   "Add current buffer to the archive in ARCBUF naming it NAME."
1065   (interactive
1066    (list (get-buffer
1067           (read-buffer "Buffer containing archive: "
1068                        ;; Find first archive buffer and suggest that
1069                        (let ((bufs (buffer-list)))
1070                          (while (and bufs
1071                                      (not (with-current-buffer (car bufs)
1072                                             (derived-mode-p 'archive-mode))))
1073                            (setq bufs (cdr bufs)))
1074                          (if bufs
1075                              (car bufs)
1076                            (error "There are no archive buffers")))
1077                        t))
1078          (read-string "File name in archive: "
1079                       (if buffer-file-name
1080                           (file-name-nondirectory buffer-file-name)
1081                         ""))))
1082   (with-current-buffer arcbuf
1083     (or (eq major-mode 'archive-mode)
1084         (error "Buffer is not an archive buffer"))
1085     (if archive-read-only
1086         (error "Archive is read-only")))
1087   (if (eq arcbuf (current-buffer))
1088       (error "An archive buffer cannot be added to itself"))
1089   (if (string= name "")
1090       (error "Archive members may not be given empty names"))
1091   (let ((func (with-current-buffer arcbuf
1092                 (archive-name "add-new-member")))
1093         (membuf (current-buffer)))
1094     (if (fboundp func)
1095         (with-current-buffer arcbuf
1096           (funcall func buffer-file-name membuf name))
1097       (error "Adding a new member is not supported for this archive type"))))
1098 ;; -------------------------------------------------------------------------
1099 ;; Section: IO stuff
1100
1101 (defun archive-write-file-member ()
1102   (save-excursion
1103     (save-restriction
1104       (message "Updating archive...")
1105       (widen)
1106       (let ((writer  (with-current-buffer archive-superior-buffer
1107                        (archive-name "write-file-member")))
1108             (archive (with-current-buffer archive-superior-buffer
1109                        (archive-maybe-copy (buffer-file-name)))))
1110         (if (fboundp writer)
1111             (funcall writer archive archive-subfile-mode)
1112           (archive-*-write-file-member archive
1113                                        archive-subfile-mode
1114                                        (symbol-value writer)))
1115         (set-buffer-modified-p nil)
1116         (message "Updating archive...done"))
1117       (set-buffer archive-superior-buffer)
1118       (if (not archive-remote) (revert-buffer) (archive-maybe-update nil))))
1119   ;; Restore the value of last-coding-system-used, so that basic-save-buffer
1120   ;; won't reset the coding-system of this archive member.
1121   (if (local-variable-p 'archive-member-coding-system)
1122       (setq last-coding-system-used archive-member-coding-system))
1123   t)
1124
1125 (defun archive-*-write-file-member (archive descr command)
1126   (let* ((ename (aref descr 0))
1127          (tmpfile (expand-file-name ename archive-tmpdir))
1128          (top (directory-file-name (file-name-as-directory archive-tmpdir)))
1129          (default-directory (file-name-as-directory top)))
1130     (unwind-protect
1131         (progn
1132           (make-directory (file-name-directory tmpfile) t)
1133           ;; If the member is itself an archive, write it without
1134           ;; the dired-like listing we created.
1135           (if (eq major-mode 'archive-mode)
1136               (archive-write-file tmpfile)
1137             (write-region (point-min) (point-max) tmpfile nil 'nomessage))
1138           ;; basic-save-buffer needs last-coding-system-used to have
1139           ;; the value used to write the file, so save it before any
1140           ;; further processing clobbers it (we restore it in
1141           ;; archive-write-file-member, above).
1142           (setq archive-member-coding-system last-coding-system-used)
1143           (if (aref descr 3)
1144               ;; Set the file modes, but make sure we can read it.
1145               (set-file-modes tmpfile (logior ?\400 (aref descr 3))))
1146           (setq ename
1147                 (encode-coding-string ename archive-file-name-coding-system))
1148           (let* ((coding-system-for-write 'no-conversion)
1149                  (exitcode (apply 'call-process
1150                                   (car command)
1151                                   nil
1152                                   nil
1153                                   nil
1154                                   (append (cdr command)
1155                                           (list archive ename)))))
1156             (if (equal exitcode 0)
1157                 nil
1158               (error "Updating was unsuccessful (%S)" exitcode))))
1159       (archive-delete-local tmpfile))))
1160
1161 (defun archive-write-file (&optional file)
1162   (save-excursion
1163     (let ((coding-system-for-write 'no-conversion))
1164       (write-region archive-proper-file-start (point-max)
1165                     (or file buffer-file-name) nil t)
1166       (set-buffer-modified-p nil))
1167     t))
1168 ;; -------------------------------------------------------------------------
1169 ;; Section: Marking and unmarking.
1170
1171 (defun archive-flag-deleted (p &optional type)
1172   "In archive mode, mark this member to be deleted from the archive.
1173 With a prefix argument, mark that many files."
1174   (interactive "p")
1175   (or type (setq type ?D))
1176   (beginning-of-line)
1177   (let ((sign (if (>= p 0) +1 -1))
1178         (modified (buffer-modified-p))
1179         (inhibit-read-only t))
1180     (while (not (zerop p))
1181       (if (archive-get-descr t)
1182           (progn
1183             (delete-char 1)
1184             (insert type)))
1185       (forward-line sign)
1186       (setq p (- p sign)))
1187     (restore-buffer-modified-p modified))
1188   (archive-next-line 0))
1189
1190 (defun archive-unflag (p)
1191   "In archive mode, un-mark this member if it is marked to be deleted.
1192 With a prefix argument, un-mark that many files forward."
1193   (interactive "p")
1194   (archive-flag-deleted p ?\s))
1195
1196 (defun archive-unflag-backwards (p)
1197   "In archive mode, un-mark this member if it is marked to be deleted.
1198 With a prefix argument, un-mark that many members backward."
1199   (interactive "p")
1200   (archive-flag-deleted (- p) ?\s))
1201
1202 (defun archive-unmark-all-files ()
1203   "Remove all marks."
1204   (interactive)
1205   (let ((modified (buffer-modified-p))
1206         (inhibit-read-only t))
1207     (save-excursion
1208       (goto-char archive-file-list-start)
1209       (while (< (point) archive-file-list-end)
1210         (or (= (following-char) ?\s)
1211             (progn (delete-char 1) (insert ?\s)))
1212         (forward-line 1)))
1213     (restore-buffer-modified-p modified)))
1214
1215 (defun archive-mark (p)
1216   "In archive mode, mark this member for group operations.
1217 With a prefix argument, mark that many members.
1218 Use \\[archive-unmark-all-files] to remove all marks."
1219   (interactive "p")
1220   (archive-flag-deleted p ?*))
1221
1222 (defun archive-get-marked (mark &optional default)
1223   (let (files)
1224     (save-excursion
1225       (goto-char archive-file-list-start)
1226       (while (< (point) archive-file-list-end)
1227         (if (= (following-char) mark)
1228             (setq files (cons (archive-get-descr) files)))
1229         (forward-line 1)))
1230     (or (nreverse files)
1231         (and default
1232              (list (archive-get-descr))))))
1233 ;; -------------------------------------------------------------------------
1234 ;; Section: Operate
1235
1236 (defun archive-next-line (p)
1237   (interactive "p")
1238   (forward-line p)
1239   (or (eobp)
1240       (forward-char archive-file-name-indent)))
1241
1242 (defun archive-previous-line (p)
1243   (interactive "p")
1244   (archive-next-line (- p)))
1245
1246 (defun archive-chmod-entry (new-mode)
1247   "Change the protection bits associated with all marked or this member.
1248 The new protection bits can either be specified as an octal number or
1249 as a relative change like \"g+rw\" as for chmod(2)."
1250   (interactive "sNew mode (octal or relative): ")
1251   (if archive-read-only (error "Archive is read-only"))
1252   (let ((func (archive-name "chmod-entry")))
1253     (if (fboundp func)
1254         (progn
1255           (funcall func new-mode (archive-get-marked ?* t))
1256           (archive-resummarize))
1257       (error "Setting mode bits is not supported for this archive type"))))
1258
1259 (defun archive-chown-entry (new-uid)
1260   "Change the owner of all marked or this member."
1261   (interactive "nNew uid: ")
1262   (if archive-read-only (error "Archive is read-only"))
1263   (let ((func (archive-name "chown-entry")))
1264     (if (fboundp func)
1265         (progn
1266           (funcall func new-uid (archive-get-marked ?* t))
1267           (archive-resummarize))
1268       (error "Setting owner is not supported for this archive type"))))
1269
1270 (defun archive-chgrp-entry (new-gid)
1271   "Change the group of all marked or this member."
1272   (interactive "nNew gid: ")
1273   (if archive-read-only (error "Archive is read-only"))
1274   (let ((func (archive-name "chgrp-entry")))
1275     (if (fboundp func)
1276         (progn
1277           (funcall func new-gid (archive-get-marked ?* t))
1278           (archive-resummarize))
1279       (error "Setting group is not supported for this archive type"))))
1280
1281 (defun archive-expunge ()
1282   "Do the flagged deletions."
1283   (interactive)
1284   (let (files)
1285     (save-excursion
1286       (goto-char archive-file-list-start)
1287       (while (< (point) archive-file-list-end)
1288         (if (= (following-char) ?D)
1289             (setq files (cons (aref (archive-get-descr) 0) files)))
1290         (forward-line 1)))
1291     (setq files (nreverse files))
1292     (and files
1293          (or (not archive-read-only)
1294              (error "Archive is read-only"))
1295          (or (yes-or-no-p (format "Really delete %d member%s? "
1296                                   (length files)
1297                                   (if (null (cdr files)) "" "s")))
1298              (error "Operation aborted"))
1299          (let ((archive (archive-maybe-copy (buffer-file-name)))
1300                (expunger (archive-name "expunge")))
1301            (if (fboundp expunger)
1302                (funcall expunger archive files)
1303              (archive-*-expunge archive files (symbol-value expunger)))
1304            (archive-maybe-update nil)
1305            (if archive-remote
1306                (archive-resummarize)
1307              (revert-buffer))))))
1308
1309 (defun archive-*-expunge (archive files command)
1310   (apply 'call-process
1311          (car command)
1312          nil
1313          nil
1314          nil
1315          (append (cdr command) (cons archive files))))
1316
1317 (defun archive-rename-entry (newname)
1318   "Change the name associated with this entry in the archive file."
1319   (interactive "sNew name: ")
1320   (if archive-read-only (error "Archive is read-only"))
1321   (if (string= newname "")
1322       (error "Archive members may not be given empty names"))
1323   (let ((func (archive-name "rename-entry"))
1324         (descr (archive-get-descr)))
1325     (if (fboundp func)
1326         (progn
1327           (funcall func
1328                    (encode-coding-string newname
1329                                          archive-file-name-coding-system)
1330                    descr)
1331           (archive-resummarize))
1332       (error "Renaming is not supported for this archive type"))))
1333
1334 ;; Revert the buffer and recompute the dired-like listing.
1335 (defun archive-mode-revert (&optional no-auto-save no-confirm)
1336   (let ((no (archive-get-lineno)))
1337     (setq archive-files nil)
1338     (let ((revert-buffer-function nil)
1339           (coding-system-for-read 'no-conversion))
1340       (revert-buffer t t))
1341     (archive-mode)
1342     (goto-char archive-file-list-start)
1343     (archive-next-line no)))
1344
1345 (defun archive-undo ()
1346   "Undo in an archive buffer.
1347 This doesn't recover lost files, it just undoes changes in the buffer itself."
1348   (interactive)
1349   (let ((inhibit-read-only t))
1350     (undo)))
1351 ;; -------------------------------------------------------------------------
1352 ;; Section: Arc Archives
1353
1354 (defun archive-arc-summarize ()
1355   (let ((p 1)
1356         (totalsize 0)
1357         (maxlen 8)
1358         files
1359         visual)
1360     (while (and (< (+ p 29) (point-max))
1361                 (= (byte-after p) ?\C-z)
1362                 (> (byte-after (1+ p)) 0))
1363       (let* ((namefld (buffer-substring (+ p 2) (+ p 2 13)))
1364              (fnlen   (or (string-match "\0" namefld) 13))
1365              (efnname (decode-coding-string (substring namefld 0 fnlen)
1366                                             archive-file-name-coding-system))
1367              ;; Convert to float to avoid overflow for very large files.
1368              (csize   (archive-l-e (+ p 15) 4 'float))
1369              (moddate (archive-l-e (+ p 19) 2))
1370              (modtime (archive-l-e (+ p 21) 2))
1371              (ucsize  (archive-l-e (+ p 25) 4 'float))
1372              (fiddle  (string= efnname (upcase efnname)))
1373              (ifnname (if fiddle (downcase efnname) efnname))
1374              (text    (format "  %8.0f  %-11s  %-8s  %s"
1375                               ucsize
1376                               (archive-dosdate moddate)
1377                               (archive-dostime modtime)
1378                               ifnname)))
1379         (setq maxlen (max maxlen fnlen)
1380               totalsize (+ totalsize ucsize)
1381               visual (cons (vector text
1382                                    (- (length text) (length ifnname))
1383                                    (length text))
1384                            visual)
1385               files (cons (vector efnname ifnname fiddle nil (1- p))
1386                           files)
1387               ;; p needs to stay an integer, since we use it in char-after
1388               ;; above.  Passing through `round' limits the compressed size
1389               ;; to most-positive-fixnum, but if the compressed size exceeds
1390               ;; that, we cannot visit the archive anyway.
1391               p (+ p 29 (round csize)))))
1392     (goto-char (point-min))
1393     (let ((dash (concat "- --------  -----------  --------  "
1394                         (make-string maxlen ?-)
1395                         "\n")))
1396       (insert "M   Length  Date         Time      File\n"
1397               dash)
1398       (archive-summarize-files (nreverse visual))
1399       (insert dash
1400               (format "  %8.0f                         %d file%s"
1401                       totalsize
1402                       (length files)
1403                       (if (= 1 (length files)) "" "s"))
1404               "\n"))
1405     (apply 'vector (nreverse files))))
1406
1407 (defun archive-arc-rename-entry (newname descr)
1408   (if (string-match "[:\\\\/]" newname)
1409       (error "File names in arc files must not contain a directory component"))
1410   (if (> (length newname) 12)
1411       (error "File names in arc files are limited to 12 characters"))
1412   (let ((name (concat newname (substring "\0\0\0\0\0\0\0\0\0\0\0\0\0"
1413                                          (length newname))))
1414         (inhibit-read-only t))
1415     (save-restriction
1416       (save-excursion
1417         (widen)
1418         (goto-char (+ archive-proper-file-start (aref descr 4) 2))
1419         (delete-char 13)
1420         (insert-unibyte name)))))
1421 ;; -------------------------------------------------------------------------
1422 ;; Section: Lzh Archives
1423
1424 (defun archive-lzh-summarize ()
1425   (let ((p 1)
1426         (totalsize 0)
1427         (maxlen 8)
1428         files
1429         visual)
1430     (while (progn (goto-char p)         ;beginning of a base header.
1431                   (looking-at "\\(.\\|\n\\)\\(.\\|\n\\)-l[hz][0-9ds]-"))
1432       (let* ((hsize   (byte-after p))   ;size of the base header (level 0 and 1)
1433              ;; Convert to float to avoid overflow for very large files.
1434              (csize   (archive-l-e (+ p 7) 4 'float)) ;size of a compressed file to follow (level 0 and 2),
1435                                         ;size of extended headers + the compressed file to follow (level 1).
1436              (ucsize  (archive-l-e (+ p 11) 4 'float))  ;size of an uncompressed file.
1437              (time1   (archive-l-e (+ p 15) 2)) ;date/time (MSDOS format in level 0, 1 headers
1438              (time2   (archive-l-e (+ p 17) 2)) ;and UNIX format in level 2 header.)
1439              (hdrlvl  (byte-after (+ p 20))) ;header level
1440              thsize             ;total header size (base + extensions)
1441              fnlen efnname fiddle ifnname width p2
1442              neh        ;beginning of next extension header (level 1 and 2)
1443              mode modestr uid gid text dir prname
1444              gname uname modtime moddate)
1445         (if (= hdrlvl 3) (error "can't handle lzh level 3 header type"))
1446         (when (or (= hdrlvl 0) (= hdrlvl 1))
1447           (setq fnlen   (byte-after (+ p 21))) ;filename length
1448           (setq efnname (let ((str (buffer-substring (+ p 22) (+ p 22 fnlen)))) ;filename from offset 22
1449                         (decode-coding-string
1450                          str archive-file-name-coding-system)))
1451           (setq p2      (+ p 22 fnlen))) ;
1452         (if (= hdrlvl 1)
1453             (setq neh (+ p2 3))         ;specific to level 1 header
1454           (if (= hdrlvl 2)
1455               (setq neh (+ p 24))))     ;specific to level 2 header
1456         (if neh         ;if level 1 or 2 we expect extension headers to follow
1457             (let* ((ehsize (archive-l-e neh 2)) ;size of the extension header
1458                    (etype (byte-after (+ neh 2)))) ;extension type
1459               (while (not (= ehsize 0))
1460                   (cond
1461                  ((= etype 1)   ;file name
1462                   (let ((i (+ neh 3)))
1463                     (while (< i (+ neh ehsize))
1464                       (setq efnname (concat efnname (char-to-string (byte-after i))))
1465                       (setq i (1+ i)))))
1466                  ((= etype 2)   ;directory name
1467                   (let ((i (+ neh 3)))
1468                     (while (< i (+ neh ehsize))
1469                                     (setq dir (concat dir
1470                                                        (if (= (byte-after i)
1471                                                               255)
1472                                                            "/"
1473                                                          (char-to-string
1474                                                           (char-after i)))))
1475                                     (setq i (1+ i)))))
1476                  ((= etype 80)          ;Unix file permission
1477                   (setq mode (archive-l-e (+ neh 3) 2)))
1478                  ((= etype 81)          ;UNIX file group/user ID
1479                   (progn (setq uid (archive-l-e (+ neh 3) 2))
1480                          (setq gid (archive-l-e (+ neh 5) 2))))
1481                  ((= etype 82)          ;UNIX file group name
1482                   (let ((i (+ neh 3)))
1483                     (while (< i (+ neh ehsize))
1484                       (setq gname (concat gname (char-to-string (char-after i))))
1485                       (setq i (1+ i)))))
1486                  ((= etype 83)          ;UNIX file user name
1487                   (let ((i (+ neh 3)))
1488                     (while (< i (+ neh ehsize))
1489                       (setq uname (concat uname (char-to-string (char-after i))))
1490                       (setq i (1+ i)))))
1491                    )
1492                 (setq neh (+ neh ehsize))
1493                 (setq ehsize (archive-l-e neh 2))
1494                 (setq etype (byte-after (+ neh 2))))
1495               ;;get total header size for level 1 and 2 headers
1496               (setq thsize (- neh p))))
1497         (if (= hdrlvl 0)  ;total header size
1498             (setq thsize hsize))
1499         (setq fiddle  (if efnname (string= efnname (upcase efnname))))
1500         (setq ifnname (if fiddle (downcase efnname) efnname))
1501         (setq prname (if dir (concat dir ifnname) ifnname))
1502         (setq width (if prname (string-width prname) 0))
1503         (setq modestr (if mode (archive-int-to-mode mode) "??????????"))
1504         (setq moddate (if (= hdrlvl 2)
1505                           (archive-unixdate time1 time2) ;level 2 header in UNIX format
1506                         (archive-dosdate time2))) ;level 0 and 1 header in DOS format
1507         (setq modtime (if (= hdrlvl 2)
1508                           (archive-unixtime time1 time2)
1509                         (archive-dostime time1)))
1510         (setq text    (if archive-alternate-display
1511                           (format "  %8.0f  %5S  %5S  %s"
1512                                   ucsize
1513                                   (or uid "?")
1514                                   (or gid "?")
1515                                   ifnname)
1516                         (format "  %10s  %8.0f  %-11s  %-8s  %s"
1517                                 modestr
1518                                 ucsize
1519                                 moddate
1520                                 modtime
1521                                 prname)))
1522         (setq maxlen (max maxlen width)
1523               totalsize (+ totalsize ucsize)
1524               visual (cons (vector text
1525                                    (- (length text) (length prname))
1526                                    (length text))
1527                            visual)
1528               files (cons (vector prname ifnname fiddle mode (1- p))
1529                           files))
1530         (cond ((= hdrlvl 1)
1531                ;; p needs to stay an integer, since we use it in goto-char
1532                ;; above.  Passing through `round' limits the compressed size
1533                ;; to most-positive-fixnum, but if the compressed size exceeds
1534                ;; that, we cannot visit the archive anyway.
1535                (setq p (+ p hsize 2 (round csize))))
1536               ((or (= hdrlvl 2) (= hdrlvl 0))
1537                (setq p (+ p thsize 2 (round csize)))))
1538         ))
1539     (goto-char (point-min))
1540     (let ((dash (concat (if archive-alternate-display
1541                             "- --------  -----  -----  "
1542                           "- ----------  --------  -----------  --------  ")
1543                         (make-string maxlen ?-)
1544                         "\n"))
1545           (header (if archive-alternate-display
1546                        "M   Length    Uid    Gid  File\n"
1547                     "M   Filemode    Length  Date         Time      File\n"))
1548           (sumline (if archive-alternate-display
1549                        "  %8.0f                %d file%s"
1550                      "              %8.0f                         %d file%s")))
1551       (insert header dash)
1552       (archive-summarize-files (nreverse visual))
1553       (insert dash
1554               (format sumline
1555                       totalsize
1556                       (length files)
1557                       (if (= 1 (length files)) "" "s"))
1558               "\n"))
1559     (apply 'vector (nreverse files))))
1560
1561 (defconst archive-lzh-alternate-display t)
1562
1563 (defun archive-lzh-extract (archive name)
1564   (archive-extract-by-stdout archive name archive-lzh-extract))
1565
1566 (defun archive-lzh-resum (p count)
1567   (let ((sum 0))
1568     (while (> count 0)
1569       (setq count (1- count)
1570             sum (+ sum (byte-after p))
1571             p (1+ p)))
1572     (logand sum 255)))
1573
1574 (defun archive-lzh-rename-entry (newname descr)
1575   (save-restriction
1576     (save-excursion
1577       (widen)
1578       (let* ((p        (+ archive-proper-file-start (aref descr 4)))
1579              (oldhsize (byte-after p))
1580              (oldfnlen (byte-after (+ p 21)))
1581              (newfnlen (length newname))
1582              (newhsize (+ oldhsize newfnlen (- oldfnlen)))
1583              (inhibit-read-only t))
1584         (if (> newhsize 255)
1585             (error "The file name is too long"))
1586         (goto-char (+ p 21))
1587         (delete-char (1+ oldfnlen))
1588         (insert-unibyte newfnlen newname)
1589         (goto-char p)
1590         (delete-char 2)
1591         (insert-unibyte newhsize (archive-lzh-resum p newhsize))))))
1592
1593 (defun archive-lzh-ogm (newval files errtxt ofs)
1594   (save-excursion
1595     (save-restriction
1596       (widen)
1597       (dolist (fil files)
1598         (let* ((p (+ archive-proper-file-start (aref fil 4)))
1599                (hsize   (byte-after p))
1600                (fnlen   (byte-after (+ p 21)))
1601                (p2      (+ p 22 fnlen))
1602                (creator (if (>= (- hsize fnlen) 24) (byte-after (+ p2 2)) 0))
1603                (inhibit-read-only t))
1604           (if (= creator ?U)
1605               (progn
1606                 (or (numberp newval)
1607                     (setq newval (funcall newval (archive-l-e (+ p2 ofs) 2))))
1608                 (goto-char (+ p2 ofs))
1609                 (delete-char 2)
1610                 (insert-unibyte (logand newval 255) (lsh newval -8))
1611                 (goto-char (1+ p))
1612                 (delete-char 1)
1613                 (insert-unibyte (archive-lzh-resum (1+ p) hsize)))
1614             (message "Member %s does not have %s field"
1615                      (aref fil 1) errtxt)))))))
1616
1617 (defun archive-lzh-chown-entry (newuid files)
1618   (archive-lzh-ogm newuid files "an uid" 10))
1619
1620 (defun archive-lzh-chgrp-entry (newgid files)
1621   (archive-lzh-ogm newgid files "a gid" 12))
1622
1623 (defun archive-lzh-chmod-entry (newmode files)
1624   (archive-lzh-ogm
1625    ;; This should work even though newmode will be dynamically accessed.
1626    (lambda (old) (archive-calc-mode old newmode t))
1627    files "a unix-style mode" 8))
1628 ;; -------------------------------------------------------------------------
1629 ;; Section: Zip Archives
1630
1631 (defun archive-zip-summarize ()
1632   (goto-char (- (point-max) (- 22 18)))
1633   (search-backward-regexp "[P]K\005\006")
1634   (let ((p (+ (point-min) (archive-l-e (+ (point) 16) 4)))
1635         (maxlen 8)
1636         (totalsize 0)
1637         files
1638         visual)
1639     (while (string= "PK\001\002" (buffer-substring p (+ p 4)))
1640       (let* ((creator (byte-after (+ p 5)))
1641              ;; (method  (archive-l-e (+ p 10) 2))
1642              (modtime (archive-l-e (+ p 12) 2))
1643              (moddate (archive-l-e (+ p 14) 2))
1644              ;; Convert to float to avoid overflow for very large files.
1645              (ucsize  (archive-l-e (+ p 24) 4 'float))
1646              (fnlen   (archive-l-e (+ p 28) 2))
1647              (exlen   (archive-l-e (+ p 30) 2))
1648              (fclen   (archive-l-e (+ p 32) 2))
1649              (lheader (archive-l-e (+ p 42) 4))
1650              (efnname (let ((str (buffer-substring (+ p 46) (+ p 46 fnlen))))
1651                         (decode-coding-string
1652                          str archive-file-name-coding-system)))
1653              (isdir   (and (= ucsize 0)
1654                            (string= (file-name-nondirectory efnname) "")))
1655              (mode    (cond ((memq creator '(2 3)) ; Unix + VMS
1656                              (archive-l-e (+ p 40) 2))
1657                             ((memq creator '(0 5 6 7 10 11 15)) ; Dos etc.
1658                              (logior ?\444
1659                                      (if isdir (logior 16384 ?\111) 0)
1660                                      (if (zerop
1661                                           (logand 1 (byte-after (+ p 38))))
1662                                          ?\222 0)))
1663                             (t nil)))
1664              (modestr (if mode (archive-int-to-mode mode) "??????????"))
1665              (fiddle  (and archive-zip-case-fiddle
1666                            (not (not (memq creator '(0 2 4 5 9))))
1667                            (string= (upcase efnname) efnname)))
1668              (ifnname (if fiddle (downcase efnname) efnname))
1669              (width (string-width ifnname))
1670              (text    (format "  %10s  %8.0f  %-11s  %-8s  %s"
1671                               modestr
1672                               ucsize
1673                               (archive-dosdate moddate)
1674                               (archive-dostime modtime)
1675                               ifnname)))
1676         (setq maxlen (max maxlen width)
1677               totalsize (+ totalsize ucsize)
1678               visual (cons (vector text
1679                                    (- (length text) (length ifnname))
1680                                    (length text))
1681                            visual)
1682               files (cons (if isdir
1683                               nil
1684                             (vector efnname ifnname fiddle mode
1685                                     (list (1- p) lheader)))
1686                           files)
1687               p (+ p 46 fnlen exlen fclen))))
1688     (goto-char (point-min))
1689     (let ((dash (concat "- ----------  --------  -----------  --------  "
1690                         (make-string maxlen ?-)
1691                         "\n")))
1692       (insert "M Filemode      Length  Date         Time      File\n"
1693               dash)
1694       (archive-summarize-files (nreverse visual))
1695       (insert dash
1696               (format "              %8.0f                         %d file%s"
1697                       totalsize
1698                       (length files)
1699                       (if (= 1 (length files)) "" "s"))
1700               "\n"))
1701     (apply 'vector (nreverse files))))
1702
1703 (defun archive-zip-extract (archive name)
1704   (if (equal (car archive-zip-extract) "pkzip")
1705       (archive-*-extract archive name archive-zip-extract)
1706     (archive-extract-by-stdout archive name archive-zip-extract)))
1707
1708 (defun archive-zip-write-file-member (archive descr)
1709   (archive-*-write-file-member
1710    archive
1711    descr
1712    (if (aref descr 2) archive-zip-update-case archive-zip-update)))
1713
1714 (defun archive-zip-chmod-entry (newmode files)
1715   (save-restriction
1716     (save-excursion
1717       (widen)
1718       (dolist (fil files)
1719         (let* ((p (+ archive-proper-file-start (car (aref fil 4))))
1720                (creator (byte-after (+ p 5)))
1721                (oldmode (aref fil 3))
1722                (newval  (archive-calc-mode oldmode newmode t))
1723                (inhibit-read-only t))
1724           (cond ((memq creator '(2 3)) ; Unix + VMS
1725                  (goto-char (+ p 40))
1726                  (delete-char 2)
1727                  (insert-unibyte (logand newval 255) (lsh newval -8)))
1728                 ((memq creator '(0 5 6 7 10 11 15)) ; Dos etc.
1729                  (goto-char (+ p 38))
1730                  (insert-unibyte (logior (logand (byte-after (point)) 254)
1731                                          (logand (logxor 1 (lsh newval -7)) 1)))
1732                  (delete-char 1))
1733                 (t (message "Don't know how to change mode for this member"))))
1734         ))))
1735 ;; -------------------------------------------------------------------------
1736 ;; Section: Zoo Archives
1737
1738 (defun archive-zoo-summarize ()
1739   (let ((p (1+ (archive-l-e 25 4)))
1740         (maxlen 8)
1741         (totalsize 0)
1742         files
1743         visual)
1744     (while (and (string= "\334\247\304\375" (buffer-substring p (+ p 4)))
1745                 (> (archive-l-e (+ p 6) 4) 0))
1746       (let* ((next    (1+ (archive-l-e (+ p 6) 4)))
1747              (moddate (archive-l-e (+ p 14) 2))
1748              (modtime (archive-l-e (+ p 16) 2))
1749              ;; Convert to float to avoid overflow for very large files.
1750              (ucsize  (archive-l-e (+ p 20) 4 'float))
1751              (namefld (buffer-substring (+ p 38) (+ p 38 13)))
1752              (dirtype (byte-after (+ p 4)))
1753              (lfnlen  (if (= dirtype 2) (byte-after (+ p 56)) 0))
1754              (ldirlen (if (= dirtype 2) (byte-after (+ p 57)) 0))
1755              (fnlen   (or (string-match "\0" namefld) 13))
1756              (efnname (let ((str
1757                              (concat
1758                               (if (> ldirlen 0)
1759                                   (concat (buffer-substring
1760                                            (+ p 58 lfnlen)
1761                                            (+ p 58 lfnlen ldirlen -1))
1762                                           "/")
1763                                 "")
1764                               (if (> lfnlen 0)
1765                                   (buffer-substring (+ p 58)
1766                                                     (+ p 58 lfnlen -1))
1767                                 (substring namefld 0 fnlen)))))
1768                         (decode-coding-string
1769                          str archive-file-name-coding-system)))
1770              (fiddle  (and (= lfnlen 0) (string= efnname (upcase efnname))))
1771              (ifnname (if fiddle (downcase efnname) efnname))
1772              (width (string-width ifnname))
1773              (text    (format "  %8.0f  %-11s  %-8s  %s"
1774                               ucsize
1775                               (archive-dosdate moddate)
1776                               (archive-dostime modtime)
1777                               ifnname)))
1778         (setq maxlen (max maxlen width)
1779               totalsize (+ totalsize ucsize)
1780               visual (cons (vector text
1781                                    (- (length text) (length ifnname))
1782                                    (length text))
1783                            visual)
1784               files (cons (vector efnname ifnname fiddle nil (1- p))
1785                           files)
1786               p next)))
1787     (goto-char (point-min))
1788     (let ((dash (concat "- --------  -----------  --------  "
1789                         (make-string maxlen ?-)
1790                         "\n")))
1791       (insert "M   Length  Date         Time      File\n"
1792               dash)
1793       (archive-summarize-files (nreverse visual))
1794       (insert dash
1795               (format "  %8.0f                         %d file%s"
1796                       totalsize
1797                       (length files)
1798                       (if (= 1 (length files)) "" "s"))
1799               "\n"))
1800     (apply 'vector (nreverse files))))
1801
1802 (defun archive-zoo-extract (archive name)
1803   (archive-extract-by-stdout archive name archive-zoo-extract))
1804 ;; -------------------------------------------------------------------------
1805 ;; This line was a mistake; it is kept now for compatibility.
1806 ;; rms  15 Oct 98
1807 (provide 'archive-mode)
1808
1809 (provide 'arc-mode)
1810
1811 ;; arch-tag: e5966a01-35ec-4f27-8095-a043a79b457b
1812 ;;; arc-mode.el ends here