1 ;;; tar-mode.el --- simple editing of tar files from GNU emacs
3 ;;; Copyright (C) 1990, 1991, 1993, 1994 Free Software Foundation, Inc.
5 ;; Author: Jamie Zawinski <jwz@lucid.com>
6 ;; Created: 04 Apr 1990
7 ;; Version: 1.21bis (some cleanup by ESR)
10 ;;; This file is part of GNU Emacs.
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.
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.
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
24 ;;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
28 ;;; This package attempts to make dealing with Unix 'tar' archives easier.
29 ;;; When this code is loaded, visiting a file whose name ends in '.tar' will
30 ;;; cause the contents of that archive file to be displayed in a Dired-like
31 ;;; listing. It is then possible to use the customary Dired keybindings to
32 ;;; extract sub-files from that archive, either by reading them into their own
33 ;;; editor buffers, or by copying them directly to arbitrary files on disk.
34 ;;; It is also possible to delete sub-files from within the tar file and write
35 ;;; the modified archive back to disk, or to edit sub-files within the archive
36 ;;; and re-insert the modified files into the archive. See the documentation
37 ;;; string of tar-mode for more info.
39 ;;; This code now understands the extra fields that GNU tar adds to tar files.
41 ;;; This interacts correctly with "uncompress.el" in the Emacs library,
42 ;;; which you get with
44 ;;; (autoload 'uncompress-while-visiting "uncompress")
45 ;;; (setq auto-mode-alist (cons '("\\.Z$" . uncompress-while-visiting)
48 ;;; Do not attempt to use tar-mode.el with crypt.el, you will lose.
50 ;;; *************** TO DO ***************
52 ;;; o chmod should understand "a+x,og-w".
54 ;;; o It's not possible to add a NEW file to a tar archive; not that
55 ;;; important, but still...
57 ;;; o The code is less efficient that it could be - in a lot of places, I
58 ;;; pull a 512-character string out of the buffer and parse it, when I could
59 ;;; be parsing it in place, not garbaging a string. Should redo that.
61 ;;; o I'd like a command that searches for a string/regexp in every subfile
62 ;;; of an archive, where <esc> would leave you in a subfile-edit buffer.
63 ;;; (Like the Meta-R command of the Zmacs mail reader.)
65 ;;; o Sometimes (but not always) reverting the tar-file buffer does not
66 ;;; re-grind the listing, and you are staring at the binary tar data.
67 ;;; Typing 'g' again immediately after that will always revert and re-grind
68 ;;; it, though. I have no idea why this happens.
70 ;;; o Tar-mode interacts poorly with crypt.el and zcat.el because the tar
71 ;;; write-file-hook actually writes the file. Instead it should remove the
72 ;;; header (and conspire to put it back afterwards) so that other write-file
73 ;;; hooks which frob the buffer have a chance to do their dirty work. There
74 ;;; might be a problem if the tar write-file-hook does not come *first* on
77 ;;; o Block files, sparse files, continuation files, and the various header
78 ;;; types aren't editable. Actually I don't know that they work at all.
82 ;;; Why does tar-mode edit the file itself instead of using tar?
84 ;;; That means that you can edit tar files which you don't have room for
85 ;;; on your local disk.
87 ;;; I don't know about recent features in gnu tar, but old versions of tar
88 ;;; can't replace a file in the middle of a tar file with a new version.
89 ;;; Tar-mode can. I don't think tar can do things like chmod the subfiles.
90 ;;; An implementation which involved unpacking and repacking the file into
91 ;;; some scratch directory would be very wasteful, and wouldn't be able to
92 ;;; preserve the file owners.
96 (defvar tar-anal-blocksize
20
97 "*The blocksize of tar files written by Emacs, or nil, meaning don't care.
98 The blocksize of a tar file is not really the size of the blocks; rather, it is
99 the number of blocks written with one system call. When tarring to a tape,
100 this is the size of the *tape* blocks, but when writing to a file, it doesn't
101 matter much. The only noticeable difference is that if a tar file does not
102 have a blocksize of 20, tar will tell you that; all this really controls is
103 how many null padding bytes go on the end of the tar file.")
105 (defvar tar-update-datestamp nil
106 "*Non-nil means tar-mode should play fast and loose with sub-file datestamps.
107 If this is true, then editing and saving a tar file entry back into its
108 tar file will update its datestamp. If false, the datestamp is unchanged.
109 You may or may not want this - it is good in that you can tell when a file
110 in a tar archive has been changed, but it is bad for the same reason that
111 editing a file in the tar archive at all is bad - the changed version of
112 the file never exists on disk.")
114 (defvar tar-mode-show-date nil
115 "*Non-nil means Tar mode should show the date/time of each subfile.
116 This information is useful, but it takes screen space away from file names.")
118 (defvar tar-parse-info nil
)
119 (defvar tar-header-offset nil
)
120 (defvar tar-superior-buffer nil
)
121 (defvar tar-superior-descriptor nil
)
122 (defvar tar-subfile-mode nil
)
124 (put 'tar-parse-info
'permanent-local t
)
125 (put 'tar-header-offset
'permanent-local t
)
126 (put 'tar-superior-buffer
'permanent-local t
)
127 (put 'tar-superior-descriptor
'permanent-local t
)
129 ;;; First, duplicate some Common Lisp functions; I used to just (require 'cl)
130 ;;; but "cl.el" was messing some people up (also it's really big).
132 (defmacro tar-setf
(form val
)
133 "A mind-numbingly simple implementation of setf."
134 (let ((mform (macroexpand form
(and (boundp 'byte-compile-macro-environment
)
135 byte-compile-macro-environment
))))
136 (cond ((symbolp mform
) (list 'setq mform val
))
137 ((not (consp mform
)) (error "can't setf %s" form
))
138 ((eq (car mform
) 'aref
)
139 (list 'aset
(nth 1 mform
) (nth 2 mform
) val
))
140 ((eq (car mform
) 'car
)
141 (list 'setcar
(nth 1 mform
) val
))
142 ((eq (car mform
) 'cdr
)
143 (list 'setcdr
(nth 1 mform
) val
))
144 (t (error "don't know how to setf %s" form
)))))
146 (defmacro tar-dolist
(control &rest body
)
147 "syntax: (dolist (var-name list-expr &optional return-value) &body body)"
148 (let ((var (car control
))
149 (init (car (cdr control
)))
150 (val (car (cdr (cdr control
)))))
151 (list 'let
(list (list '_dolist_iterator_ init
))
152 (list 'while
'_dolist_iterator_
154 (cons (list (list var
'(car _dolist_iterator_
)))
156 (list (list 'setq
'_dolist_iterator_
157 (list 'cdr
'_dolist_iterator_
)))))))
160 (defmacro tar-dotimes
(control &rest body
)
161 "syntax: (dolist (var-name count-expr &optional return-value) &body body)"
162 (let ((var (car control
))
163 (n (car (cdr control
)))
164 (val (car (cdr (cdr control
)))))
165 (list 'let
(list (list '_dotimes_end_ n
)
168 (cons (list '< var
'_dotimes_end_
)
170 (list (list 'setq var
(list '1+ var
))))))
174 ;;; down to business.
176 (defmacro make-tar-header
(name mode uid git size date ck lt ln
177 magic uname gname devmaj devmin
)
178 (list 'vector name mode uid git size date ck lt ln
179 magic uname gname devmaj devmin
))
181 (defmacro tar-header-name
(x) (list 'aref x
0))
182 (defmacro tar-header-mode
(x) (list 'aref x
1))
183 (defmacro tar-header-uid
(x) (list 'aref x
2))
184 (defmacro tar-header-gid
(x) (list 'aref x
3))
185 (defmacro tar-header-size
(x) (list 'aref x
4))
186 (defmacro tar-header-date
(x) (list 'aref x
5))
187 (defmacro tar-header-checksum
(x) (list 'aref x
6))
188 (defmacro tar-header-link-type
(x) (list 'aref x
7))
189 (defmacro tar-header-link-name
(x) (list 'aref x
8))
190 (defmacro tar-header-magic
(x) (list 'aref x
9))
191 (defmacro tar-header-uname
(x) (list 'aref x
10))
192 (defmacro tar-header-gname
(x) (list 'aref x
11))
193 (defmacro tar-header-dmaj
(x) (list 'aref x
12))
194 (defmacro tar-header-dmin
(x) (list 'aref x
13))
196 (defmacro make-tar-desc
(data-start tokens
)
197 (list 'cons data-start tokens
))
199 (defmacro tar-desc-data-start
(x) (list 'car x
))
200 (defmacro tar-desc-tokens
(x) (list 'cdr x
))
202 (defconst tar-name-offset
0)
203 (defconst tar-mode-offset
(+ tar-name-offset
100))
204 (defconst tar-uid-offset
(+ tar-mode-offset
8))
205 (defconst tar-gid-offset
(+ tar-uid-offset
8))
206 (defconst tar-size-offset
(+ tar-gid-offset
8))
207 (defconst tar-time-offset
(+ tar-size-offset
12))
208 (defconst tar-chk-offset
(+ tar-time-offset
12))
209 (defconst tar-linkp-offset
(+ tar-chk-offset
8))
210 (defconst tar-link-offset
(+ tar-linkp-offset
1))
211 ;;; GNU-tar specific slots.
212 (defconst tar-magic-offset
(+ tar-link-offset
100))
213 (defconst tar-uname-offset
(+ tar-magic-offset
8))
214 (defconst tar-gname-offset
(+ tar-uname-offset
32))
215 (defconst tar-dmaj-offset
(+ tar-gname-offset
32))
216 (defconst tar-dmin-offset
(+ tar-dmaj-offset
8))
217 (defconst tar-end-offset
(+ tar-dmin-offset
8))
219 (defun tar-header-block-tokenize (string)
220 "Return a `tar-header' structure.
221 This is a list of name, mode, uid, gid, size,
222 write-date, checksum, link-type, and link-name."
223 (cond ((< (length string
) 512) nil
)
224 (;(some 'plusp string) ; <-- oops, massive cycle hog!
225 (or (not (= 0 (aref string
0))) ; This will do.
226 (not (= 0 (aref string
101))))
227 (let* ((name-end (1- tar-mode-offset
))
228 (link-end (1- tar-magic-offset
))
229 (uname-end (1- tar-gname-offset
))
230 (gname-end (1- tar-dmaj-offset
))
231 (link-p (aref string tar-linkp-offset
))
232 (magic-str (substring string tar-magic-offset
(1- tar-uname-offset
)))
233 (uname-valid-p (or (string= "ustar " magic-str
) (string= "GNUtar " magic-str
)))
235 (nulsexp "[^\000]*\000"))
236 (and (string-match nulsexp string tar-name-offset
) (setq name-end
(min name-end
(1- (match-end 0)))))
237 (and (string-match nulsexp string tar-link-offset
) (setq link-end
(min link-end
(1- (match-end 0)))))
238 (and (string-match nulsexp string tar-uname-offset
) (setq uname-end
(min uname-end
(1- (match-end 0)))))
239 (and (string-match nulsexp string tar-gname-offset
) (setq gname-end
(min gname-end
(1- (match-end 0)))))
240 (setq name
(substring string tar-name-offset name-end
)
241 link-p
(if (or (= link-p
0) (= link-p ?
0))
244 (if (and (null link-p
) (string-match "/$" name
)) (setq link-p
5)) ; directory
247 (tar-parse-octal-integer string tar-mode-offset
(1- tar-uid-offset
))
248 (tar-parse-octal-integer string tar-uid-offset
(1- tar-gid-offset
))
249 (tar-parse-octal-integer string tar-gid-offset
(1- tar-size-offset
))
250 (tar-parse-octal-integer string tar-size-offset
(1- tar-time-offset
))
251 (tar-parse-octal-long-integer string tar-time-offset
(1- tar-chk-offset
))
252 (tar-parse-octal-integer string tar-chk-offset
(1- tar-linkp-offset
))
254 (substring string tar-link-offset link-end
)
256 (and uname-valid-p
(substring string tar-uname-offset uname-end
))
257 (and uname-valid-p
(substring string tar-gname-offset gname-end
))
258 (tar-parse-octal-integer string tar-dmaj-offset
(1- tar-dmin-offset
))
259 (tar-parse-octal-integer string tar-dmin-offset
(1- tar-end-offset
))
261 (t 'empty-tar-block
)))
264 (defun tar-parse-octal-integer (string &optional start end
)
265 (if (null start
) (setq start
0))
266 (if (null end
) (setq end
(length string
)))
267 (if (= (aref string start
) 0)
271 (setq n
(if (< (aref string start
) ?
0) n
272 (+ (* n
8) (- (aref string start
) ?
0)))
276 (defun tar-parse-octal-long-integer (string &optional start end
)
277 (if (null start
) (setq start
0))
278 (if (null end
) (setq end
(length string
)))
279 (if (= (aref string start
) 0)
284 (if (>= (aref string start
) ?
0)
285 (setq lo
(+ (* lo
8) (- (aref string start
) ?
0))
286 hi
(+ (* hi
8) (ash lo -
16))
287 lo
(logand lo
65535)))
288 (setq start
(1+ start
)))
291 (defun tar-parse-octal-integer-safe (string)
292 (let ((L (length string
)))
293 (if (= L
0) (error "empty string"))
295 (if (or (< (aref string i
) ?
0)
296 (> (aref string i
) ?
7))
297 (error "'%c' is not an octal digit"))))
298 (tar-parse-octal-integer string
))
301 (defun tar-header-block-checksum (string)
302 "Compute and return a tar-acceptable checksum for this block."
303 (let* ((chk-field-start tar-chk-offset
)
304 (chk-field-end (+ chk-field-start
8))
307 ;; Add up all of the characters except the ones in the checksum field.
308 ;; Add that field as if it were filled with spaces.
309 (while (< i chk-field-start
)
310 (setq sum
(+ sum
(aref string i
))
312 (setq i chk-field-end
)
314 (setq sum
(+ sum
(aref string i
))
318 (defun tar-header-block-check-checksum (hblock desired-checksum file-name
)
319 "Beep and print a warning if the checksum doesn't match."
320 (if (not (= desired-checksum
(tar-header-block-checksum hblock
)))
321 (progn (beep) (message "Invalid checksum for file %s!" file-name
))))
323 (defun tar-header-block-recompute-checksum (hblock)
324 "Modifies the given string to have a valid checksum field."
325 (let* ((chk (tar-header-block-checksum hblock
))
326 (chk-string (format "%6o" chk
))
327 (l (length chk-string
)))
330 (tar-dotimes (i l
) (aset hblock
(- 153 i
) (aref chk-string
(- l i
1)))))
333 (defun tar-clip-time-string (time)
334 (let ((str (current-time-string time
)))
335 (concat (substring str
4 16) (substring str
19 24))))
337 (defun tar-grind-file-mode (mode string start
)
338 "Store `-rw--r--r--' indicating MODE into STRING beginning at START.
339 MODE should be an integer which is a file mode value."
340 (aset string start
(if (zerop (logand 256 mode
)) ?- ?r
))
341 (aset string
(+ start
1) (if (zerop (logand 128 mode
)) ?- ?w
))
342 (aset string
(+ start
2) (if (zerop (logand 64 mode
)) ?- ?x
))
343 (aset string
(+ start
3) (if (zerop (logand 32 mode
)) ?- ?r
))
344 (aset string
(+ start
4) (if (zerop (logand 16 mode
)) ?- ?w
))
345 (aset string
(+ start
5) (if (zerop (logand 8 mode
)) ?- ?x
))
346 (aset string
(+ start
6) (if (zerop (logand 4 mode
)) ?- ?r
))
347 (aset string
(+ start
7) (if (zerop (logand 2 mode
)) ?- ?w
))
348 (aset string
(+ start
8) (if (zerop (logand 1 mode
)) ?- ?x
))
349 (if (zerop (logand 1024 mode
)) nil
(aset string
(+ start
2) ?s
))
350 (if (zerop (logand 2048 mode
)) nil
(aset string
(+ start
5) ?s
))
353 (defun tar-header-block-summarize (tar-hblock &optional mod-p
)
354 "Returns a line similar to the output of `tar -vtf'."
355 (let ((name (tar-header-name tar-hblock
))
356 (mode (tar-header-mode tar-hblock
))
357 (uid (tar-header-uid tar-hblock
))
358 (gid (tar-header-gid tar-hblock
))
359 (uname (tar-header-uname tar-hblock
))
360 (gname (tar-header-gname tar-hblock
))
361 (size (tar-header-size tar-hblock
))
362 (time (tar-header-date tar-hblock
))
363 (ck (tar-header-checksum tar-hblock
))
364 (link-p (tar-header-link-type tar-hblock
))
365 (link-name (tar-header-link-name tar-hblock
))
371 (datew (if tar-mode-show-date
18 0))
372 (slash (1- (+ left namew
)))
373 (lastdigit (+ slash groupw sizew
))
374 (datestart (+ lastdigit
2))
375 (namestart (+ datestart datew
))
376 (string (make-string (+ namestart
(length name
) (if link-p
(+ 5 (length link-name
)) 0)) 32))
377 (type (tar-header-link-type tar-hblock
)))
378 (aset string
0 (if mod-p ?
* ?
))
380 (cond ((or (eq type nil
) (eq type
0)) ?-
)
381 ((eq type
1) ?l
) ; link
382 ((eq type
2) ?s
) ; symlink
383 ((eq type
3) ?c
) ; char special
384 ((eq type
4) ?b
) ; block special
385 ((eq type
5) ?d
) ; directory
386 ((eq type
6) ?p
) ; FIFO/pipe
387 ((eq type
20) ?
*) ; directory listing
388 ((eq type
29) ?M
) ; multivolume continuation
389 ((eq type
35) ?S
) ; sparse
390 ((eq type
38) ?V
) ; volume header
392 (tar-grind-file-mode mode string
2)
393 (setq uid
(if (= 0 (length uname
)) (int-to-string uid
) uname
))
394 (setq gid
(if (= 0 (length gname
)) (int-to-string gid
) gname
))
395 (setq size
(int-to-string size
))
396 (setq time
(tar-clip-time-string time
))
397 (tar-dotimes (i (min (1- namew
) (length uid
))) (aset string
(- slash i
) (aref uid
(- (length uid
) i
1))))
398 (aset string
(1+ slash
) ?
/)
399 (tar-dotimes (i (min (1- groupw
) (length gid
))) (aset string
(+ (+ slash
2) i
) (aref gid i
)))
400 (tar-dotimes (i (min sizew
(length size
))) (aset string
(- lastdigit i
) (aref size
(- (length size
) i
1))))
401 (if tar-mode-show-date
402 (tar-dotimes (i (length time
)) (aset string
(+ datestart i
) (aref time i
))))
403 (tar-dotimes (i (length name
)) (aset string
(+ namestart i
) (aref name i
)))
404 (if (or (eq link-p
1) (eq link-p
2))
406 (tar-dotimes (i 3) (aset string
(+ namestart
1 (length name
) i
) (aref (if (= link-p
1) "==>" "-->") i
)))
407 (tar-dotimes (i (length link-name
)) (aset string
(+ namestart
5 (length name
) i
) (aref link-name i
)))))
408 (put-text-property namestart
(length string
)
409 'mouse-face
'highlight string
)
413 (defun tar-summarize-buffer ()
414 "Parse the contents of the tar file in the current buffer.
415 Place a dired-like listing on the front;
416 then narrow to it, so that only that listing
417 is visible (and the real data of the buffer is hidden)."
418 (message "parsing tar file...")
421 (bs (max 1 (- (buffer-size) 1024))) ; always 2+ empty blocks at end.
422 (bs100 (max 1 (/ bs
100)))
424 (while (and (<= (+ pos
512) (point-max))
425 (not (eq 'empty-tar-block
427 (tar-header-block-tokenize
428 (buffer-substring pos
(+ pos
512)))))))
429 (setq pos
(+ pos
512))
430 (message "Parsing tar file...%d%%"
431 ;(/ (* pos 100) bs) ; this gets round-off lossage
432 (/ pos bs100
) ; this doesn't
434 (if (eq (tar-header-link-type tokens
) 20)
435 ;; Foo. There's an extra empty block after these.
436 (setq pos
(+ pos
512)))
437 (let ((size (tar-header-size tokens
)))
439 (error "%s has size %s - corrupted"
440 (tar-header-name tokens
) size
))
442 ; This is just too slow. Don't really need it anyway....
443 ;(tar-header-block-check-checksum
444 ; hblock (tar-header-block-checksum hblock)
445 ; (tar-header-name tokens))
447 (setq result
(cons (make-tar-desc pos tokens
) result
))
449 (and (null (tar-header-link-type tokens
))
452 (+ pos
512 (ash (ash (1- size
) -
9) 9)) ; this works
453 ;(+ pos (+ size (- 512 (rem (1- size) 512)))) ; this doesn't
455 (make-local-variable 'tar-parse-info
)
456 (setq tar-parse-info
(nreverse result
))
457 ;; A tar file should end with a block or two of nulls,
458 ;; but let's not get a fatal error if it doesn't.
459 (if (eq tokens
'empty-tar-block
)
460 (message "Parsing tar file...done.")
461 (message "Warning: premature EOF parsing tar file")))
463 (goto-char (point-min))
464 (let ((buffer-read-only nil
))
465 (tar-dolist (tar-desc tar-parse-info
)
467 (tar-header-block-summarize (tar-desc-tokens tar-desc
)))
468 (insert-string "\n"))
469 (make-local-variable 'tar-header-offset
)
470 (setq tar-header-offset
(point))
471 (narrow-to-region 1 tar-header-offset
)
472 (set-buffer-modified-p nil
))))
474 (defvar tar-mode-map nil
"*Local keymap for Tar mode listings.")
478 (setq tar-mode-map
(make-keymap))
479 (suppress-keymap tar-mode-map
)
480 (define-key tar-mode-map
" " 'tar-next-line
)
481 (define-key tar-mode-map
"c" 'tar-copy
)
482 (define-key tar-mode-map
"d" 'tar-flag-deleted
)
483 (define-key tar-mode-map
"\^D" 'tar-flag-deleted
)
484 (define-key tar-mode-map
"e" 'tar-extract
)
485 (define-key tar-mode-map
"f" 'tar-extract
)
486 (define-key tar-mode-map
"\C-m" 'tar-extract
)
487 (define-key tar-mode-map
[mouse-2
] 'tar-mouse-extract
)
488 (define-key tar-mode-map
"g" 'revert-buffer
)
489 (define-key tar-mode-map
"h" 'describe-mode
)
490 (define-key tar-mode-map
"n" 'tar-next-line
)
491 (define-key tar-mode-map
"\^N" 'tar-next-line
)
492 (define-key tar-mode-map
"o" 'tar-extract-other-window
)
493 (define-key tar-mode-map
"p" 'tar-previous-line
)
494 (define-key tar-mode-map
"\^P" 'tar-previous-line
)
495 (define-key tar-mode-map
"r" 'tar-rename-entry
)
496 (define-key tar-mode-map
"u" 'tar-unflag
)
497 (define-key tar-mode-map
"v" 'tar-view
)
498 (define-key tar-mode-map
"x" 'tar-expunge
)
499 (define-key tar-mode-map
"\177" 'tar-unflag-backwards
)
500 (define-key tar-mode-map
"E" 'tar-extract-other-window
)
501 (define-key tar-mode-map
"M" 'tar-chmod-entry
)
502 (define-key tar-mode-map
"G" 'tar-chgrp-entry
)
503 (define-key tar-mode-map
"O" 'tar-chown-entry
)
506 ;; Make menu bar items.
508 ;; Get rid of the Edit menu bar item to save space.
509 (define-key tar-mode-map
[menu-bar edit
] 'undefined
)
511 (define-key tar-mode-map
[menu-bar immediate
]
512 (cons "Immediate" (make-sparse-keymap "Immediate")))
514 (define-key tar-mode-map
[menu-bar immediate view
]
515 '("View This File" . tar-view
))
516 (define-key tar-mode-map
[menu-bar immediate display
]
517 '("Display in Other Window" . tar-display-file
))
518 (define-key tar-mode-map
[menu-bar immediate find-file-other-window
]
519 '("Find in Other Window" . tar-extract-other-window
))
520 (define-key tar-mode-map
[menu-bar immediate find-file
]
521 '("Find This File" . tar-extract
))
523 (define-key tar-mode-map
[menu-bar mark
]
524 (cons "Mark" (make-sparse-keymap "Mark")))
526 (define-key tar-mode-map
[menu-bar mark unmark-all
]
527 '("Unmark All" . tar-clear-modification-flags
))
528 (define-key tar-mode-map
[menu-bar mark deletion
]
529 '("Flag" . tar-flag-deleted
))
530 (define-key tar-mode-map
[menu-bar mark unmark
]
531 '("Unflag" . tar-unflag
))
533 (define-key tar-mode-map
[menu-bar operate
]
534 (cons "Operate" (make-sparse-keymap "Operate")))
536 (define-key tar-mode-map
[menu-bar operate chown
]
537 '("Change Owner..." . tar-chown-entry
))
538 (define-key tar-mode-map
[menu-bar operate chgrp
]
539 '("Change Group..." . tar-chgrp-entry
))
540 (define-key tar-mode-map
[menu-bar operate chmod
]
541 '("Change Mode..." . tar-chmod-entry
))
542 (define-key tar-mode-map
[menu-bar operate rename
]
543 '("Rename to..." . tar-rename-entry
))
544 (define-key tar-mode-map
[menu-bar operate copy
]
545 '("Copy to..." . tar-copy
))
546 (define-key tar-mode-map
[menu-bar operate expunge
]
547 '("Expunge marked files" . tar-expunge
))
549 ;; tar mode is suitable only for specially formatted data.
550 (put 'tar-mode
'mode-class
'special
)
551 (put 'tar-subfile-mode
'mode-class
'special
)
555 "Major mode for viewing a tar file as a dired-like listing of its contents.
556 You can move around using the usual cursor motion commands.
557 Letters no longer insert themselves.
558 Type `e' to pull a file out of the tar file and into its own buffer;
559 or click mouse-2 on the file's line in the Tar mode buffer.
560 Type `c' to copy an entry from the tar file into another file on disk.
562 If you edit a sub-file of this archive (as with the `e' command) and
563 save it with Control-x Control-s, the contents of that buffer will be
564 saved back into the tar-file buffer; in this way you can edit a file
565 inside of a tar archive without extracting it and re-archiving it.
567 See also: variables `tar-update-datestamp' and `tar-anal-blocksize'.
569 ;; this is not interactive because you shouldn't be turning this
570 ;; mode on and off. You can corrupt things that way.
571 ;; rms: with permanent locals, it should now be possible to make this work
572 ;; interactively in some reasonable fashion.
573 (kill-all-local-variables)
574 (make-local-variable 'tar-header-offset
)
575 (make-local-variable 'tar-parse-info
)
576 (make-local-variable 'require-final-newline
)
577 (setq require-final-newline nil
) ; binary data, dude...
578 (make-local-variable 'revert-buffer-function
)
579 (setq revert-buffer-function
'tar-mode-revert
)
580 (make-local-variable 'enable-local-variables
)
581 (setq enable-local-variables nil
)
582 (setq major-mode
'tar-mode
)
583 (setq mode-name
"Tar")
584 (use-local-map tar-mode-map
)
587 (if (and (boundp 'tar-header-offset
) tar-header-offset
)
588 (narrow-to-region 1 tar-header-offset
)
589 (tar-summarize-buffer))
590 (run-hooks 'tar-mode-hook
)
594 ;; This should be converted to use a minor mode keymap.
596 (defun tar-subfile-mode (p)
597 "Minor mode for editing an element of a tar-file.
598 This mode redefines C-x C-s to save the current buffer back into its
599 associated tar-file buffer. You must save that buffer to actually
600 save your changes to disk."
602 (or (and (boundp 'tar-superior-buffer
) tar-superior-buffer
)
603 (error "This buffer is not an element of a tar file"))
604 ;;; Don't do this, because it is redundant and wastes mode line space.
605 ;;; (or (assq 'tar-subfile-mode minor-mode-alist)
606 ;;; (setq minor-mode-alist (append minor-mode-alist
607 ;;; (list '(tar-subfile-mode " TarFile")))))
608 (make-local-variable 'tar-subfile-mode
)
609 (setq tar-subfile-mode
611 (not tar-subfile-mode
)
612 (> (prefix-numeric-value p
) 0)))
613 (cond (tar-subfile-mode
614 (make-local-variable 'local-write-file-hooks
)
615 (setq local-write-file-hooks
'(tar-subfile-save-buffer))
616 ;; turn off auto-save.
618 (setq buffer-auto-save-file-name nil
)
619 (run-hooks 'tar-subfile-mode-hook
))
621 (kill-local-variable 'local-write-file-hooks
))))
624 ;; Revert the buffer and recompute the dired-like listing.
625 (defun tar-mode-revert (&optional no-autosave no-confirm
)
626 (setq tar-header-offset nil
)
627 (let ((revert-buffer-function nil
))
628 (revert-buffer t no-confirm
)
633 (defun tar-next-line (p)
636 (if (eobp) nil
(forward-char (if tar-mode-show-date
54 36))))
638 (defun tar-previous-line (p)
640 (tar-next-line (- p
)))
642 (defun tar-current-descriptor (&optional noerror
)
643 "Return the tar-descriptor of the current line, or signals an error."
644 ;; I wish lines had plists, like in ZMACS...
645 (or (nth (count-lines (point-min)
646 (save-excursion (beginning-of-line) (point)))
650 (error "This line does not describe a tar-file entry"))))
652 (defun tar-get-descriptor ()
653 (let* ((descriptor (tar-current-descriptor))
654 (tokens (tar-desc-tokens descriptor
))
655 (size (tar-header-size tokens
))
656 (link-p (tar-header-link-type tokens
)))
658 (error "This is a %s, not a real file"
659 (cond ((eq link-p
5) "directory")
660 ((eq link-p
20) "tar directory header")
661 ((eq link-p
29) "multivolume-continuation")
662 ((eq link-p
35) "sparse entry")
663 ((eq link-p
38) "volume header")
665 (if (zerop size
) (error "This is a zero-length file"))
668 (defun tar-mouse-extract (event)
669 "Extract a file whose tar directory line you click on."
672 (set-buffer (window-buffer (posn-window (event-end event
))))
674 (goto-char (posn-point (event-end event
)))
675 ;; Just make sure this doesn't get an error.
676 (tar-get-descriptor)))
677 (select-window (posn-window (event-end event
)))
678 (goto-char (posn-point (event-end event
)))
681 (defun tar-extract (&optional other-window-p
)
682 "In Tar mode, extract this entry of the tar file into its own buffer."
684 (let* ((view-p (eq other-window-p
'view
))
685 (descriptor (tar-get-descriptor))
686 (tokens (tar-desc-tokens descriptor
))
687 (name (tar-header-name tokens
))
688 (size (tar-header-size tokens
))
689 (start (+ (tar-desc-data-start descriptor
) tar-header-offset -
1))
690 (end (+ start size
)))
691 (let* ((tar-buffer (current-buffer))
692 (tarname (file-name-nondirectory (buffer-file-name)))
693 (bufname (concat (file-name-nondirectory name
)
697 (read-only-p (or buffer-read-only view-p
))
698 (buffer (get-buffer bufname
))
702 (setq buffer
(get-buffer-create bufname
))
703 (setq just-created t
)
709 (insert-buffer-substring tar-buffer start end
)
711 (setq buffer-file-name
712 (expand-file-name (concat tarname
":" name
)))
713 (setq buffer-file-truename
714 (abbreviate-file-name buffer-file-name
))
715 ;; Set the default-directory to the dir of the
717 (setq default-directory
719 (set-buffer tar-buffer
)
721 (normal-mode) ; pick a mode.
722 (rename-buffer bufname
)
723 (make-local-variable 'tar-superior-buffer
)
724 (make-local-variable 'tar-superior-descriptor
)
725 (setq tar-superior-buffer tar-buffer
)
726 (setq tar-superior-descriptor descriptor
)
728 (setq buffer-read-only read-only-p
)
729 (set-buffer-modified-p nil
))
730 (set-buffer tar-buffer
))
731 (narrow-to-region 1 tar-header-offset
)))
736 (setq view-exit-action
'kill-buffer
)))
737 (if (eq other-window-p
'display
)
738 (display-buffer buffer
)
740 (switch-to-buffer-other-window buffer
)
741 (switch-to-buffer buffer
)))))))
744 (defun tar-extract-other-window ()
745 "*In Tar mode, find this entry of the tar file in another window."
749 (defun tar-display-other-window ()
750 "*In Tar mode, display this entry of the tar file in another window."
752 (tar-extract 'display
))
755 "*In Tar mode, view the tar file entry on this line."
760 (defun tar-read-file-name (&optional prompt
)
761 "Read a file name with this line's entry as the default."
762 (or prompt
(setq prompt
"Copy to: "))
763 (let* ((default-file (expand-file-name
764 (tar-header-name (tar-desc-tokens
765 (tar-current-descriptor)))))
766 (target (expand-file-name
767 (read-file-name prompt
768 (file-name-directory default-file
)
770 (if (or (string= "" (file-name-nondirectory target
))
771 (file-directory-p target
))
772 (setq target
(concat (if (string-match "/$" target
)
773 (substring target
0 (1- (match-end 0)))
776 (file-name-nondirectory default-file
))))
780 (defun tar-copy (&optional to-file
)
781 "*In Tar mode, extract this entry of the tar file into a file on disk.
782 If TO-FILE is not supplied, it is prompted for, defaulting to the name of
783 the current tar-entry."
784 (interactive (list (tar-read-file-name)))
785 (let* ((descriptor (tar-get-descriptor))
786 (tokens (tar-desc-tokens descriptor
))
787 (name (tar-header-name tokens
))
788 (size (tar-header-size tokens
))
789 (start (+ (tar-desc-data-start descriptor
) tar-header-offset -
1))
790 (end (+ start size
)))
793 (write-region start end to-file
))
794 (message "Copied tar entry %s to %s" name to-file
)))
796 (defun tar-flag-deleted (p &optional unflag
)
797 "*In Tar mode, mark this sub-file to be deleted from the tar file.
798 With a prefix argument, mark that many files."
801 (tar-dotimes (i (if (< p
0) (- p
) p
))
802 (if (tar-current-descriptor unflag
) ; barf if we're not on an entry-line.
805 (insert (if unflag
" " "D"))))
806 (forward-line (if (< p
0) -
1 1)))
807 (if (eobp) nil
(forward-char 36)))
809 (defun tar-unflag (p)
810 "*In Tar mode, un-mark this sub-file if it is marked to be deleted.
811 With a prefix argument, un-mark that many files forward."
813 (tar-flag-deleted p t
))
815 (defun tar-unflag-backwards (p)
816 "*In Tar mode, un-mark this sub-file if it is marked to be deleted.
817 With a prefix argument, un-mark that many files backward."
819 (tar-flag-deleted (- p
) t
))
822 (defun tar-expunge-internal ()
823 "Expunge the tar-entry specified by the current line."
824 (let* ((descriptor (tar-current-descriptor))
825 (tokens (tar-desc-tokens descriptor
))
826 (line (tar-desc-data-start descriptor
))
827 (name (tar-header-name tokens
))
828 (size (tar-header-size tokens
))
829 (link-p (tar-header-link-type tokens
))
830 (start (tar-desc-data-start descriptor
))
831 (following-descs (cdr (memq descriptor tar-parse-info
))))
832 (if link-p
(setq size
0)) ; size lies for hard-links.
834 ;; delete the current line...
836 (let ((line-start (point)))
837 (end-of-line) (forward-char)
838 (let ((line-len (- (point) line-start
)))
839 (delete-region line-start
(point))
841 ;; decrement the header-pointer to be in synch...
842 (setq tar-header-offset
(- tar-header-offset line-len
))))
844 ;; delete the data pointer...
845 (setq tar-parse-info
(delq descriptor tar-parse-info
))
847 ;; delete the data from inside the file...
849 (let* ((data-start (+ start tar-header-offset -
513))
850 (data-end (+ data-start
512 (ash (ash (+ size
511) -
9) 9))))
851 (delete-region data-start data-end
)
853 ;; and finally, decrement the start-pointers of all following
854 ;; entries in the archive. This is a pig when deleting a bunch
855 ;; of files at once - we could optimize this to only do the
856 ;; iteration over the files that remain, or only iterate up to
857 ;; the next file to be deleted.
858 (let ((data-length (- data-end data-start
)))
859 (tar-dolist (desc following-descs
)
860 (tar-setf (tar-desc-data-start desc
)
861 (- (tar-desc-data-start desc
) data-length
))))
863 (narrow-to-region 1 tar-header-offset
))
866 (defun tar-expunge (&optional noconfirm
)
867 "*In Tar mode, delete all the archived files flagged for deletion.
868 This does not modify the disk image; you must save the tar file itself
869 for this to be permanent."
872 (y-or-n-p "expunge files marked for deletion? "))
878 (progn (tar-expunge-internal)
881 ;; after doing the deletions, add any padding that may be necessary.
882 (tar-pad-to-blocksize)
883 (narrow-to-region 1 tar-header-offset
)
886 (message "nothing to expunge.")
887 (message "%s expunged. Be sure to save this buffer." n
)))))
890 (defun tar-clear-modification-flags ()
891 "Remove the stars at the beginning of each line."
894 (while (< (point) tar-header-offset
)
896 (progn (delete-char 1) (insert " ")))
900 (defun tar-chown-entry (new-uid)
901 "*Change the user-id associated with this entry in the tar file.
902 If this tar file was written by GNU tar, then you will be able to edit
903 the user id as a string; otherwise, you must edit it as a number.
904 You can force editing as a number by calling this with a prefix arg.
905 This does not modify the disk image; you must save the tar file itself
906 for this to be permanent."
908 (let ((tokens (tar-desc-tokens (tar-current-descriptor))))
909 (if (or current-prefix-arg
910 (not (tar-header-magic tokens
)))
912 (while (not (numberp (setq n
(read-minibuffer
914 (format "%s" (tar-header-uid tokens
)))))))
916 (read-string "New UID string: " (tar-header-uname tokens
))))))
917 (cond ((stringp new-uid
)
918 (tar-setf (tar-header-uname (tar-desc-tokens (tar-current-descriptor)))
920 (tar-alter-one-field tar-uname-offset
(concat new-uid
"\000")))
922 (tar-setf (tar-header-uid (tar-desc-tokens (tar-current-descriptor)))
924 (tar-alter-one-field tar-uid-offset
925 (concat (substring (format "%6o" new-uid
) 0 6) "\000 ")))))
928 (defun tar-chgrp-entry (new-gid)
929 "*Change the group-id associated with this entry in the tar file.
930 If this tar file was written by GNU tar, then you will be able to edit
931 the group id as a string; otherwise, you must edit it as a number.
932 You can force editing as a number by calling this with a prefix arg.
933 This does not modify the disk image; you must save the tar file itself
934 for this to be permanent."
936 (let ((tokens (tar-desc-tokens (tar-current-descriptor))))
937 (if (or current-prefix-arg
938 (not (tar-header-magic tokens
)))
940 (while (not (numberp (setq n
(read-minibuffer
942 (format "%s" (tar-header-gid tokens
)))))))
944 (read-string "New GID string: " (tar-header-gname tokens
))))))
945 (cond ((stringp new-gid
)
946 (tar-setf (tar-header-gname (tar-desc-tokens (tar-current-descriptor)))
948 (tar-alter-one-field tar-gname-offset
949 (concat new-gid
"\000")))
951 (tar-setf (tar-header-gid (tar-desc-tokens (tar-current-descriptor)))
953 (tar-alter-one-field tar-gid-offset
954 (concat (substring (format "%6o" new-gid
) 0 6) "\000 ")))))
956 (defun tar-rename-entry (new-name)
957 "*Change the name associated with this entry in the tar file.
958 This does not modify the disk image; you must save the tar file itself
959 for this to be permanent."
961 (list (read-string "New name: "
962 (tar-header-name (tar-desc-tokens (tar-current-descriptor))))))
963 (if (string= "" new-name
) (error "zero length name"))
964 (if (> (length new-name
) 98) (error "name too long"))
965 (tar-setf (tar-header-name (tar-desc-tokens (tar-current-descriptor)))
967 (tar-alter-one-field 0
968 (substring (concat new-name
(make-string 99 0)) 0 99)))
971 (defun tar-chmod-entry (new-mode)
972 "*Change the protection bits associated with this entry in the tar file.
973 This does not modify the disk image; you must save the tar file itself
974 for this to be permanent."
975 (interactive (list (tar-parse-octal-integer-safe
976 (read-string "New protection (octal): "))))
977 (tar-setf (tar-header-mode (tar-desc-tokens (tar-current-descriptor)))
979 (tar-alter-one-field tar-mode-offset
980 (concat (substring (format "%6o" new-mode
) 0 6) "\000 ")))
983 (defun tar-alter-one-field (data-position new-data-string
)
984 (let* ((descriptor (tar-current-descriptor))
985 (tokens (tar-desc-tokens descriptor
)))
989 ;; update the header-line.
993 (delete-region p
(point))
994 (insert (tar-header-block-summarize tokens
) "\n")
995 (setq tar-header-offset
(point-max)))
998 (let* ((start (+ (tar-desc-data-start descriptor
) tar-header-offset -
513)))
1000 ;; delete the old field and insert a new one.
1001 (goto-char (+ start data-position
))
1002 (delete-region (point) (+ (point) (length new-data-string
))) ; <--
1003 (insert new-data-string
) ; <--
1005 ;; compute a new checksum and insert it.
1006 (let ((chk (tar-header-block-checksum
1007 (buffer-substring start
(+ start
512)))))
1008 (goto-char (+ start tar-chk-offset
))
1009 (delete-region (point) (+ (point) 8))
1010 (insert (format "%6o" chk
))
1013 (tar-setf (tar-header-checksum tokens
) chk
)
1015 ;; ok, make sure we didn't botch it.
1016 (tar-header-block-check-checksum
1017 (buffer-substring start
(+ start
512))
1018 chk
(tar-header-name tokens
))
1020 (narrow-to-region 1 tar-header-offset
))))
1023 (defun tar-octal-time (timeval)
1024 ;; Format a timestamp as 11 octal digits. Ghod, I hope this works...
1025 (let ((hibits (car timeval
)) (lobits (car (cdr timeval
))))
1026 (insert (format "%05o%01o%05o"
1028 (logior (lsh (logand 3 hibits
) 1) (> (logand lobits
32768) 0))
1029 (logand 32767 lobits
)
1032 (defun tar-subfile-save-buffer ()
1033 "In tar subfile mode, save this buffer into its parent tar-file buffer.
1034 This doesn't write anything to disk; you must save the parent tar-file buffer
1035 to make your changes permanent."
1037 (if (not (and (boundp 'tar-superior-buffer
) tar-superior-buffer
))
1038 (error "This buffer has no superior tar file buffer"))
1039 (if (not (and (boundp 'tar-superior-descriptor
) tar-superior-descriptor
))
1040 (error "This buffer doesn't have an index into its superior tar file!"))
1042 (let ((subfile (current-buffer))
1043 (subfile-size (buffer-size))
1044 (descriptor tar-superior-descriptor
))
1045 (set-buffer tar-superior-buffer
)
1046 (let* ((tokens (tar-desc-tokens descriptor
))
1047 (start (tar-desc-data-start descriptor
))
1048 (name (tar-header-name tokens
))
1049 (size (tar-header-size tokens
))
1050 (size-pad (ash (ash (+ size
511) -
9) 9))
1051 (head (memq descriptor tar-parse-info
))
1052 (following-descs (cdr head
)))
1054 (error "Can't find this tar file entry in its parent tar file!"))
1058 ;; delete the old data...
1059 (let* ((data-start (+ start tar-header-offset -
1))
1060 (data-end (+ data-start
(ash (ash (+ size
511) -
9) 9))))
1061 (delete-region data-start data-end
)
1062 ;; insert the new data...
1063 (goto-char data-start
)
1064 (insert-buffer subfile
)
1066 ;; pad the new data out to a multiple of 512...
1067 (let ((subfile-size-pad (ash (ash (+ subfile-size
511) -
9) 9)))
1068 (goto-char (+ data-start subfile-size
))
1069 (insert (make-string (- subfile-size-pad subfile-size
) 0))
1071 ;; update the data pointer of this and all following files...
1072 (tar-setf (tar-header-size tokens
) subfile-size
)
1073 (let ((difference (- subfile-size-pad size-pad
)))
1074 (tar-dolist (desc following-descs
)
1075 (tar-setf (tar-desc-data-start desc
)
1076 (+ (tar-desc-data-start desc
) difference
))))
1078 ;; Update the size field in the header block.
1079 (let ((header-start (- data-start
512)))
1080 (goto-char (+ header-start tar-size-offset
))
1081 (delete-region (point) (+ (point) 12))
1082 (insert (format "%11o" subfile-size
))
1085 ;; Maybe update the datestamp.
1086 (if (not tar-update-datestamp
)
1088 (goto-char (+ header-start tar-time-offset
))
1089 (delete-region (point) (+ (point) 12))
1090 (insert (tar-octal-time (current-time)))
1093 ;; compute a new checksum and insert it.
1094 (let ((chk (tar-header-block-checksum
1095 (buffer-substring header-start data-start
))))
1096 (goto-char (+ header-start tar-chk-offset
))
1097 (delete-region (point) (+ (point) 8))
1098 (insert (format "%6o" chk
))
1101 (tar-setf (tar-header-checksum tokens
) chk
)))
1103 ;; alter the descriptor-line...
1105 (let ((position (- (length tar-parse-info
) (length head
))))
1107 (next-line position
)
1111 (m (set-marker (make-marker) tar-header-offset
)))
1113 (setq after
(point))
1114 ;; Insert the new text after the old, before deleting,
1115 ;; to preserve the window start.
1116 (insert-before-markers (tar-header-block-summarize tokens t
) "\n")
1117 (delete-region p after
)
1118 (setq tar-header-offset
(marker-position m
)))
1120 ;; after doing the insertion, add any final padding that may be necessary.
1121 (tar-pad-to-blocksize))
1122 (narrow-to-region 1 tar-header-offset
)))
1123 (set-buffer-modified-p t
) ; mark the tar file as modified
1124 (set-buffer subfile
)
1125 (set-buffer-modified-p nil
) ; mark the tar subfile as unmodified
1126 (message "saved into tar-buffer `%s' -- remember to save that buffer!"
1127 (buffer-name tar-superior-buffer
))
1128 ;; Prevent ordinary saving from happening.
1132 (defun tar-pad-to-blocksize ()
1133 "If we are being anal about tar file blocksizes, fix up the current buffer.
1134 Leaves the region wide."
1135 (if (null tar-anal-blocksize
)
1138 (let* ((last-desc (nth (1- (length tar-parse-info
)) tar-parse-info
))
1139 (start (tar-desc-data-start last-desc
))
1140 (tokens (tar-desc-tokens last-desc
))
1141 (link-p (tar-header-link-type tokens
))
1142 (size (if link-p
0 (tar-header-size tokens
)))
1143 (data-end (+ start size
))
1144 (bbytes (ash tar-anal-blocksize
9))
1145 (pad-to (+ bbytes
(* bbytes
(/ (1- data-end
) bbytes
))))
1146 (inhibit-read-only t
) ; ##
1148 ;; If the padding after the last data is too long, delete some;
1149 ;; else insert some until we are padded out to the right number of blocks.
1151 (goto-char (+ (or tar-header-offset
0) data-end
))
1152 (if (> (1+ (buffer-size)) (+ (or tar-header-offset
0) pad-to
))
1153 (delete-region (+ (or tar-header-offset
0) pad-to
) (1+ (buffer-size)))
1154 (insert (make-string (- (+ (or tar-header-offset
0) pad-to
)
1160 ;; Used in write-file-hook to write tar-files out correctly.
1161 (defun tar-mode-maybe-write-tar-file ()
1163 ;; If the current buffer is in Tar mode and has its header-offset set,
1164 ;; only write out the part of the file after the header-offset.
1166 (if (and (eq major-mode
'tar-mode
)
1167 (and (boundp 'tar-header-offset
) tar-header-offset
))
1170 (tar-clear-modification-flags)
1172 ;; Doing this here confuses things - the region gets left too wide!
1173 ;; I suppose this is run in a context where changing the buffer is bad.
1174 ;; (tar-pad-to-blocksize)
1175 (write-region tar-header-offset
(1+ (buffer-size)) buffer-file-name nil t
)
1176 ;; return T because we've written the file.
1178 (narrow-to-region 1 tar-header-offset
)
1180 ;; return NIL because we haven't.
1186 (or (memq 'tar-mode-maybe-write-tar-file write-file-hooks
)
1187 (setq write-file-hooks
1188 (cons 'tar-mode-maybe-write-tar-file write-file-hooks
)))
1192 ;;; tar-mode.el ends here