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c88ab9ce | 1 | ;;; tar-mode.el --- simple editing of tar files from GNU emacs |
aa73f29c | 2 | |
0d30b337 | 3 | ;; Copyright (C) 1990, 1991, 1993, 1994, 1995, 1996, 1997, 1998, 1999, |
409cc4a3 | 4 | ;; 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc. |
eea8d4ef | 5 | |
22a89ee8 | 6 | ;; Author: Jamie Zawinski <jwz@lucid.com> |
54138c9d | 7 | ;; Maintainer: FSF |
e5167999 | 8 | ;; Created: 04 Apr 1990 |
d7b4d18f | 9 | ;; Keywords: unix |
aa73f29c | 10 | |
b578f267 EN |
11 | ;; This file is part of GNU Emacs. |
12 | ||
13 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
14 | ;; it under the terms of the GNU General Public License as published by | |
b4aa6026 | 15 | ;; the Free Software Foundation; either version 3, or (at your option) |
b578f267 EN |
16 | ;; any later version. |
17 | ||
18 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
19 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
20 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
21 | ;; GNU General Public License for more details. | |
22 | ||
23 | ;; You should have received a copy of the GNU General Public License | |
24 | ;; along with GNU Emacs; see the file COPYING. If not, write to the | |
086add15 LK |
25 | ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
26 | ;; Boston, MA 02110-1301, USA. | |
aa73f29c | 27 | |
22a89ee8 ER |
28 | ;;; Commentary: |
29 | ||
b578f267 EN |
30 | ;; This package attempts to make dealing with Unix 'tar' archives easier. |
31 | ;; When this code is loaded, visiting a file whose name ends in '.tar' will | |
32 | ;; cause the contents of that archive file to be displayed in a Dired-like | |
33 | ;; listing. It is then possible to use the customary Dired keybindings to | |
34 | ;; extract sub-files from that archive, either by reading them into their own | |
35 | ;; editor buffers, or by copying them directly to arbitrary files on disk. | |
36 | ;; It is also possible to delete sub-files from within the tar file and write | |
37 | ;; the modified archive back to disk, or to edit sub-files within the archive | |
38 | ;; and re-insert the modified files into the archive. See the documentation | |
39 | ;; string of tar-mode for more info. | |
40 | ||
41 | ;; This code now understands the extra fields that GNU tar adds to tar files. | |
42 | ||
43 | ;; This interacts correctly with "uncompress.el" in the Emacs library, | |
f1180544 | 44 | ;; which you get with |
b578f267 EN |
45 | ;; |
46 | ;; (autoload 'uncompress-while-visiting "uncompress") | |
47 | ;; (setq auto-mode-alist (cons '("\\.Z$" . uncompress-while-visiting) | |
48 | ;; auto-mode-alist)) | |
49 | ;; | |
50 | ;; Do not attempt to use tar-mode.el with crypt.el, you will lose. | |
51 | ||
f1180544 | 52 | ;; *************** TO DO *************** |
b578f267 EN |
53 | ;; |
54 | ;; o chmod should understand "a+x,og-w". | |
55 | ;; | |
f1180544 | 56 | ;; o It's not possible to add a NEW file to a tar archive; not that |
b578f267 EN |
57 | ;; important, but still... |
58 | ;; | |
59 | ;; o The code is less efficient that it could be - in a lot of places, I | |
60 | ;; pull a 512-character string out of the buffer and parse it, when I could | |
61 | ;; be parsing it in place, not garbaging a string. Should redo that. | |
62 | ;; | |
63 | ;; o I'd like a command that searches for a string/regexp in every subfile | |
64 | ;; of an archive, where <esc> would leave you in a subfile-edit buffer. | |
65 | ;; (Like the Meta-R command of the Zmacs mail reader.) | |
66 | ;; | |
f1180544 | 67 | ;; o Sometimes (but not always) reverting the tar-file buffer does not |
b578f267 EN |
68 | ;; re-grind the listing, and you are staring at the binary tar data. |
69 | ;; Typing 'g' again immediately after that will always revert and re-grind | |
70 | ;; it, though. I have no idea why this happens. | |
71 | ;; | |
72 | ;; o Tar-mode interacts poorly with crypt.el and zcat.el because the tar | |
73 | ;; write-file-hook actually writes the file. Instead it should remove the | |
74 | ;; header (and conspire to put it back afterwards) so that other write-file | |
75 | ;; hooks which frob the buffer have a chance to do their dirty work. There | |
76 | ;; might be a problem if the tar write-file-hook does not come *first* on | |
77 | ;; the list. | |
78 | ;; | |
f1180544 | 79 | ;; o Block files, sparse files, continuation files, and the various header |
b578f267 EN |
80 | ;; types aren't editable. Actually I don't know that they work at all. |
81 | ||
82 | ;; Rationale: | |
83 | ||
84 | ;; Why does tar-mode edit the file itself instead of using tar? | |
85 | ||
86 | ;; That means that you can edit tar files which you don't have room for | |
87 | ;; on your local disk. | |
88 | ||
89 | ;; I don't know about recent features in gnu tar, but old versions of tar | |
90 | ;; can't replace a file in the middle of a tar file with a new version. | |
91 | ;; Tar-mode can. I don't think tar can do things like chmod the subfiles. | |
92 | ;; An implementation which involved unpacking and repacking the file into | |
93 | ;; some scratch directory would be very wasteful, and wouldn't be able to | |
94 | ;; preserve the file owners. | |
ce210066 | 95 | |
22a89ee8 ER |
96 | ;;; Code: |
97 | ||
b4dd2e66 SE |
98 | (defgroup tar nil |
99 | "Simple editing of tar files." | |
100 | :prefix "tar-" | |
101 | :group 'data) | |
102 | ||
103 | (defcustom tar-anal-blocksize 20 | |
8560523d | 104 | "The blocksize of tar files written by Emacs, or nil, meaning don't care. |
aa73f29c | 105 | The blocksize of a tar file is not really the size of the blocks; rather, it is |
f1180544 | 106 | the number of blocks written with one system call. When tarring to a tape, |
aa73f29c RS |
107 | this is the size of the *tape* blocks, but when writing to a file, it doesn't |
108 | matter much. The only noticeable difference is that if a tar file does not | |
109 | have a blocksize of 20, tar will tell you that; all this really controls is | |
b4dd2e66 SE |
110 | how many null padding bytes go on the end of the tar file." |
111 | :type '(choice integer (const nil)) | |
112 | :group 'tar) | |
aa73f29c | 113 | |
b4dd2e66 | 114 | (defcustom tar-update-datestamp nil |
8560523d | 115 | "Non-nil means Tar mode should play fast and loose with sub-file datestamps. |
30712209 | 116 | If this is true, then editing and saving a tar file entry back into its |
aa73f29c RS |
117 | tar file will update its datestamp. If false, the datestamp is unchanged. |
118 | You may or may not want this - it is good in that you can tell when a file | |
119 | in a tar archive has been changed, but it is bad for the same reason that | |
f1180544 | 120 | editing a file in the tar archive at all is bad - the changed version of |
b4dd2e66 SE |
121 | the file never exists on disk." |
122 | :type 'boolean | |
123 | :group 'tar) | |
aa73f29c | 124 | |
b4dd2e66 | 125 | (defcustom tar-mode-show-date nil |
8560523d | 126 | "Non-nil means Tar mode should show the date/time of each subfile. |
b4dd2e66 SE |
127 | This information is useful, but it takes screen space away from file names." |
128 | :type 'boolean | |
129 | :group 'tar) | |
30712209 | 130 | |
0f8becaa | 131 | (defvar tar-parse-info nil) |
1b33e237 | 132 | ;; Be sure that this variable holds byte position, not char position. |
0f8becaa ER |
133 | (defvar tar-header-offset nil) |
134 | (defvar tar-superior-buffer nil) | |
135 | (defvar tar-superior-descriptor nil) | |
136 | (defvar tar-subfile-mode nil) | |
1c0b3743 RS |
137 | |
138 | (put 'tar-parse-info 'permanent-local t) | |
139 | (put 'tar-header-offset 'permanent-local t) | |
140 | (put 'tar-superior-buffer 'permanent-local t) | |
141 | (put 'tar-superior-descriptor 'permanent-local t) | |
aa73f29c | 142 | \f |
aa73f29c RS |
143 | (defmacro tar-setf (form val) |
144 | "A mind-numbingly simple implementation of setf." | |
145 | (let ((mform (macroexpand form (and (boundp 'byte-compile-macro-environment) | |
146 | byte-compile-macro-environment)))) | |
147 | (cond ((symbolp mform) (list 'setq mform val)) | |
148 | ((not (consp mform)) (error "can't setf %s" form)) | |
149 | ((eq (car mform) 'aref) | |
150 | (list 'aset (nth 1 mform) (nth 2 mform) val)) | |
151 | ((eq (car mform) 'car) | |
152 | (list 'setcar (nth 1 mform) val)) | |
153 | ((eq (car mform) 'cdr) | |
154 | (list 'setcdr (nth 1 mform) val)) | |
155 | (t (error "don't know how to setf %s" form))))) | |
aa73f29c RS |
156 | \f |
157 | ;;; down to business. | |
158 | ||
159 | (defmacro make-tar-header (name mode uid git size date ck lt ln | |
160 | magic uname gname devmaj devmin) | |
161 | (list 'vector name mode uid git size date ck lt ln | |
162 | magic uname gname devmaj devmin)) | |
163 | ||
164 | (defmacro tar-header-name (x) (list 'aref x 0)) | |
165 | (defmacro tar-header-mode (x) (list 'aref x 1)) | |
166 | (defmacro tar-header-uid (x) (list 'aref x 2)) | |
167 | (defmacro tar-header-gid (x) (list 'aref x 3)) | |
168 | (defmacro tar-header-size (x) (list 'aref x 4)) | |
169 | (defmacro tar-header-date (x) (list 'aref x 5)) | |
170 | (defmacro tar-header-checksum (x) (list 'aref x 6)) | |
171 | (defmacro tar-header-link-type (x) (list 'aref x 7)) | |
172 | (defmacro tar-header-link-name (x) (list 'aref x 8)) | |
173 | (defmacro tar-header-magic (x) (list 'aref x 9)) | |
174 | (defmacro tar-header-uname (x) (list 'aref x 10)) | |
175 | (defmacro tar-header-gname (x) (list 'aref x 11)) | |
176 | (defmacro tar-header-dmaj (x) (list 'aref x 12)) | |
177 | (defmacro tar-header-dmin (x) (list 'aref x 13)) | |
178 | ||
179 | (defmacro make-tar-desc (data-start tokens) | |
180 | (list 'cons data-start tokens)) | |
181 | ||
182 | (defmacro tar-desc-data-start (x) (list 'car x)) | |
183 | (defmacro tar-desc-tokens (x) (list 'cdr x)) | |
184 | ||
185 | (defconst tar-name-offset 0) | |
186 | (defconst tar-mode-offset (+ tar-name-offset 100)) | |
187 | (defconst tar-uid-offset (+ tar-mode-offset 8)) | |
188 | (defconst tar-gid-offset (+ tar-uid-offset 8)) | |
189 | (defconst tar-size-offset (+ tar-gid-offset 8)) | |
190 | (defconst tar-time-offset (+ tar-size-offset 12)) | |
191 | (defconst tar-chk-offset (+ tar-time-offset 12)) | |
192 | (defconst tar-linkp-offset (+ tar-chk-offset 8)) | |
193 | (defconst tar-link-offset (+ tar-linkp-offset 1)) | |
194 | ;;; GNU-tar specific slots. | |
195 | (defconst tar-magic-offset (+ tar-link-offset 100)) | |
196 | (defconst tar-uname-offset (+ tar-magic-offset 8)) | |
197 | (defconst tar-gname-offset (+ tar-uname-offset 32)) | |
198 | (defconst tar-dmaj-offset (+ tar-gname-offset 32)) | |
199 | (defconst tar-dmin-offset (+ tar-dmaj-offset 8)) | |
200 | (defconst tar-end-offset (+ tar-dmin-offset 8)) | |
201 | ||
1bc28099 | 202 | (defun tar-header-block-tokenize (string) |
e865c5ce | 203 | "Return a `tar-header' structure. |
f1180544 | 204 | This is a list of name, mode, uid, gid, size, |
e865c5ce | 205 | write-date, checksum, link-type, and link-name." |
aa73f29c RS |
206 | (cond ((< (length string) 512) nil) |
207 | (;(some 'plusp string) ; <-- oops, massive cycle hog! | |
208 | (or (not (= 0 (aref string 0))) ; This will do. | |
209 | (not (= 0 (aref string 101)))) | |
210 | (let* ((name-end (1- tar-mode-offset)) | |
211 | (link-end (1- tar-magic-offset)) | |
212 | (uname-end (1- tar-gname-offset)) | |
213 | (gname-end (1- tar-dmaj-offset)) | |
214 | (link-p (aref string tar-linkp-offset)) | |
215 | (magic-str (substring string tar-magic-offset (1- tar-uname-offset))) | |
216 | (uname-valid-p (or (string= "ustar " magic-str) (string= "GNUtar " magic-str))) | |
5342b2c7 | 217 | name linkname |
aa73f29c | 218 | (nulsexp "[^\000]*\000")) |
d710de41 RS |
219 | (when (string-match nulsexp string tar-name-offset) |
220 | (setq name-end (min name-end (1- (match-end 0))))) | |
221 | (when (string-match nulsexp string tar-link-offset) | |
222 | (setq link-end (min link-end (1- (match-end 0))))) | |
223 | (when (string-match nulsexp string tar-uname-offset) | |
224 | (setq uname-end (min uname-end (1- (match-end 0))))) | |
225 | (when (string-match nulsexp string tar-gname-offset) | |
226 | (setq gname-end (min gname-end (1- (match-end 0))))) | |
aa73f29c RS |
227 | (setq name (substring string tar-name-offset name-end) |
228 | link-p (if (or (= link-p 0) (= link-p ?0)) | |
229 | nil | |
230 | (- link-p ?0))) | |
1b33e237 KH |
231 | (setq linkname (substring string tar-link-offset link-end)) |
232 | (if default-enable-multibyte-characters | |
233 | (setq name | |
8560523d SM |
234 | (decode-coding-string name |
235 | (or file-name-coding-system | |
236 | default-file-name-coding-system | |
237 | 'undecided)) | |
1b33e237 | 238 | linkname |
8560523d SM |
239 | (decode-coding-string linkname |
240 | (or file-name-coding-system | |
241 | default-file-name-coding-system | |
242 | 'undecided)))) | |
243 | (if (and (null link-p) (string-match "/\\'" name)) (setq link-p 5)) ; directory | |
aa73f29c RS |
244 | (make-tar-header |
245 | name | |
248d750a KH |
246 | (tar-parse-octal-integer string tar-mode-offset tar-uid-offset) |
247 | (tar-parse-octal-integer string tar-uid-offset tar-gid-offset) | |
248 | (tar-parse-octal-integer string tar-gid-offset tar-size-offset) | |
249 | (tar-parse-octal-integer string tar-size-offset tar-time-offset) | |
250 | (tar-parse-octal-long-integer string tar-time-offset tar-chk-offset) | |
251 | (tar-parse-octal-integer string tar-chk-offset tar-linkp-offset) | |
aa73f29c | 252 | link-p |
1b33e237 | 253 | linkname |
aa73f29c RS |
254 | uname-valid-p |
255 | (and uname-valid-p (substring string tar-uname-offset uname-end)) | |
256 | (and uname-valid-p (substring string tar-gname-offset gname-end)) | |
248d750a KH |
257 | (tar-parse-octal-integer string tar-dmaj-offset tar-dmin-offset) |
258 | (tar-parse-octal-integer string tar-dmin-offset tar-end-offset) | |
aa73f29c RS |
259 | ))) |
260 | (t 'empty-tar-block))) | |
261 | ||
262 | ||
263 | (defun tar-parse-octal-integer (string &optional start end) | |
aa73f29c RS |
264 | (if (null start) (setq start 0)) |
265 | (if (null end) (setq end (length string))) | |
266 | (if (= (aref string start) 0) | |
267 | 0 | |
268 | (let ((n 0)) | |
269 | (while (< start end) | |
270 | (setq n (if (< (aref string start) ?0) n | |
30712209 | 271 | (+ (* n 8) (- (aref string start) ?0))) |
aa73f29c RS |
272 | start (1+ start))) |
273 | n))) | |
274 | ||
30712209 RS |
275 | (defun tar-parse-octal-long-integer (string &optional start end) |
276 | (if (null start) (setq start 0)) | |
277 | (if (null end) (setq end (length string))) | |
278 | (if (= (aref string start) 0) | |
806cba9c | 279 | (list 0 0) |
30712209 RS |
280 | (let ((lo 0) |
281 | (hi 0)) | |
282 | (while (< start end) | |
283 | (if (>= (aref string start) ?0) | |
284 | (setq lo (+ (* lo 8) (- (aref string start) ?0)) | |
285 | hi (+ (* hi 8) (ash lo -16)) | |
286 | lo (logand lo 65535))) | |
287 | (setq start (1+ start))) | |
288 | (list hi lo)))) | |
289 | ||
aa73f29c | 290 | (defun tar-parse-octal-integer-safe (string) |
8560523d SM |
291 | (if (zerop (length string)) (error "empty string")) |
292 | (mapc (lambda (c) | |
293 | (if (or (< c ?0) (> c ?7)) | |
294 | (error "`%c' is not an octal digit" c))) | |
295 | string) | |
aa73f29c RS |
296 | (tar-parse-octal-integer string)) |
297 | ||
298 | ||
1bc28099 | 299 | (defun tar-header-block-checksum (string) |
e865c5ce | 300 | "Compute and return a tar-acceptable checksum for this block." |
aa73f29c RS |
301 | (let* ((chk-field-start tar-chk-offset) |
302 | (chk-field-end (+ chk-field-start 8)) | |
303 | (sum 0) | |
304 | (i 0)) | |
305 | ;; Add up all of the characters except the ones in the checksum field. | |
306 | ;; Add that field as if it were filled with spaces. | |
307 | (while (< i chk-field-start) | |
308 | (setq sum (+ sum (aref string i)) | |
309 | i (1+ i))) | |
310 | (setq i chk-field-end) | |
311 | (while (< i 512) | |
312 | (setq sum (+ sum (aref string i)) | |
313 | i (1+ i))) | |
314 | (+ sum (* 32 8)))) | |
315 | ||
1bc28099 | 316 | (defun tar-header-block-check-checksum (hblock desired-checksum file-name) |
aa73f29c | 317 | "Beep and print a warning if the checksum doesn't match." |
1bc28099 | 318 | (if (not (= desired-checksum (tar-header-block-checksum hblock))) |
aa73f29c RS |
319 | (progn (beep) (message "Invalid checksum for file %s!" file-name)))) |
320 | ||
30712209 RS |
321 | (defun tar-clip-time-string (time) |
322 | (let ((str (current-time-string time))) | |
139f2b7c | 323 | (concat " " (substring str 4 16) (substring str 19 24)))) |
aa73f29c | 324 | |
139f2b7c SM |
325 | (defun tar-grind-file-mode (mode) |
326 | "Construct a `-rw--r--r--' string indicating MODE. | |
6a06ace6 | 327 | MODE should be an integer which is a file mode value." |
139f2b7c SM |
328 | (string |
329 | (if (zerop (logand 256 mode)) ?- ?r) | |
330 | (if (zerop (logand 128 mode)) ?- ?w) | |
331 | (if (zerop (logand 1024 mode)) (if (zerop (logand 64 mode)) ?- ?x) ?s) | |
332 | (if (zerop (logand 32 mode)) ?- ?r) | |
333 | (if (zerop (logand 16 mode)) ?- ?w) | |
334 | (if (zerop (logand 2048 mode)) (if (zerop (logand 8 mode)) ?- ?x) ?s) | |
335 | (if (zerop (logand 4 mode)) ?- ?r) | |
336 | (if (zerop (logand 2 mode)) ?- ?w) | |
337 | (if (zerop (logand 1 mode)) ?- ?x))) | |
aa73f29c | 338 | |
1bc28099 | 339 | (defun tar-header-block-summarize (tar-hblock &optional mod-p) |
139f2b7c | 340 | "Return a line similar to the output of `tar -vtf'." |
aa73f29c RS |
341 | (let ((name (tar-header-name tar-hblock)) |
342 | (mode (tar-header-mode tar-hblock)) | |
343 | (uid (tar-header-uid tar-hblock)) | |
344 | (gid (tar-header-gid tar-hblock)) | |
345 | (uname (tar-header-uname tar-hblock)) | |
346 | (gname (tar-header-gname tar-hblock)) | |
347 | (size (tar-header-size tar-hblock)) | |
348 | (time (tar-header-date tar-hblock)) | |
8560523d | 349 | ;; (ck (tar-header-checksum tar-hblock)) |
139f2b7c SM |
350 | (type (tar-header-link-type tar-hblock)) |
351 | (link-name (tar-header-link-name tar-hblock))) | |
352 | (format "%c%c%s%8s/%-8s%7s%s %s%s" | |
353 | (if mod-p ?* ? ) | |
aa73f29c | 354 | (cond ((or (eq type nil) (eq type 0)) ?-) |
6ee30a2a RS |
355 | ((eq type 1) ?h) ; link |
356 | ((eq type 2) ?l) ; symlink | |
139f2b7c SM |
357 | ((eq type 3) ?c) ; char special |
358 | ((eq type 4) ?b) ; block special | |
359 | ((eq type 5) ?d) ; directory | |
360 | ((eq type 6) ?p) ; FIFO/pipe | |
361 | ((eq type 20) ?*) ; directory listing | |
f9580781 | 362 | ((eq type 28) ?L) ; next has longname |
139f2b7c SM |
363 | ((eq type 29) ?M) ; multivolume continuation |
364 | ((eq type 35) ?S) ; sparse | |
365 | ((eq type 38) ?V) ; volume header | |
2bff30c4 | 366 | ((eq type 55) ?H) ; extended pax header |
e5d56b61 | 367 | (t ?\s) |
139f2b7c SM |
368 | ) |
369 | (tar-grind-file-mode mode) | |
370 | (if (= 0 (length uname)) uid uname) | |
371 | (if (= 0 (length gname)) gid gname) | |
372 | size | |
373 | (if tar-mode-show-date (tar-clip-time-string time) "") | |
a28eaf2c EZ |
374 | (propertize name |
375 | 'mouse-face 'highlight | |
376 | 'help-echo "mouse-2: extract this file into a buffer") | |
139f2b7c SM |
377 | (if (or (eq type 1) (eq type 2)) |
378 | (concat (if (= type 1) " ==> " " --> ") link-name) | |
379 | "")))) | |
aa73f29c | 380 | |
27129192 | 381 | (defun tar-untar-buffer () |
643415c4 | 382 | "Extract all archive members in the tar-file into the current directory." |
27129192 RS |
383 | (interactive) |
384 | (let ((multibyte enable-multibyte-characters)) | |
385 | (unwind-protect | |
386 | (save-restriction | |
387 | (widen) | |
388 | (set-buffer-multibyte nil) | |
389 | (dolist (descriptor tar-parse-info) | |
390 | (let* ((tokens (tar-desc-tokens descriptor)) | |
391 | (name (tar-header-name tokens)) | |
392 | (dir (file-name-directory name)) | |
643415c4 SM |
393 | (start (+ (tar-desc-data-start descriptor) |
394 | (- tar-header-offset (point-min)))) | |
27129192 | 395 | (end (+ start (tar-header-size tokens)))) |
76bf6666 RS |
396 | (unless (file-directory-p name) |
397 | (message "Extracting %s" name) | |
398 | (if (and dir (not (file-exists-p dir))) | |
399 | (make-directory dir t)) | |
643415c4 SM |
400 | (unless (file-directory-p name) |
401 | (write-region start end name)) | |
76bf6666 | 402 | (set-file-modes name (tar-header-mode tokens)))))) |
27129192 RS |
403 | (set-buffer-multibyte multibyte)))) |
404 | ||
aa73f29c | 405 | (defun tar-summarize-buffer () |
e865c5ce RS |
406 | "Parse the contents of the tar file in the current buffer. |
407 | Place a dired-like listing on the front; | |
408 | then narrow to it, so that only that listing | |
aa73f29c | 409 | is visible (and the real data of the buffer is hidden)." |
8560523d SM |
410 | (let ((modified (buffer-modified-p))) |
411 | (set-buffer-multibyte nil) | |
412 | (let* ((result '()) | |
413 | (pos (point-min)) | |
414 | (progress-reporter | |
415 | (make-progress-reporter "Parsing tar file..." | |
416 | (point-min) (max 1 (- (buffer-size) 1024)))) | |
417 | tokens) | |
418 | (while (and (<= (+ pos 512) (point-max)) | |
419 | (not (eq 'empty-tar-block | |
420 | (setq tokens | |
421 | (tar-header-block-tokenize | |
422 | (buffer-substring pos (+ pos 512))))))) | |
423 | (setq pos (+ pos 512)) | |
a0fefe57 SM |
424 | (when (equal (tar-header-name tokens) "././@LongLink") |
425 | ;; This is a GNU Tar long-file-name header. | |
426 | (let* ((size (tar-header-size tokens)) | |
427 | ;; -1 so as to strip the terminating 0 byte. | |
428 | (name (buffer-substring pos (+ pos size -1)))) | |
429 | (setq pos (+ pos (ash (ash (+ 511 size) -9) 9))) | |
430 | (setq tokens (tar-header-block-tokenize | |
431 | (buffer-substring pos (+ pos 512)))) | |
432 | (tar-setf (tar-header-name tokens) name) | |
433 | (setq pos (+ pos 512)))) | |
8560523d | 434 | (progress-reporter-update progress-reporter pos) |
2bff30c4 | 435 | (if (memq (tar-header-link-type tokens) '(20 55)) |
8560523d SM |
436 | ;; Foo. There's an extra empty block after these. |
437 | (setq pos (+ pos 512))) | |
438 | (let ((size (tar-header-size tokens))) | |
439 | (if (< size 0) | |
440 | (error "%s has size %s - corrupted" | |
441 | (tar-header-name tokens) size)) | |
a0fefe57 SM |
442 | ;; |
443 | ;; This is just too slow. Don't really need it anyway.... | |
444 | ;;(tar-header-block-check-checksum | |
445 | ;; hblock (tar-header-block-checksum hblock) | |
446 | ;; (tar-header-name tokens)) | |
8560523d SM |
447 | |
448 | (push (make-tar-desc pos tokens) result) | |
449 | ||
450 | (and (null (tar-header-link-type tokens)) | |
451 | (> size 0) | |
a0fefe57 SM |
452 | ;; Round up to a multiple of 512. |
453 | (setq pos (+ pos (ash (ash (+ 511 size) -9) 9)))))) | |
8560523d SM |
454 | (make-local-variable 'tar-parse-info) |
455 | (setq tar-parse-info (nreverse result)) | |
456 | ;; A tar file should end with a block or two of nulls, | |
457 | ;; but let's not get a fatal error if it doesn't. | |
458 | (if (eq tokens 'empty-tar-block) | |
459 | (progress-reporter-done progress-reporter) | |
460 | (message "Warning: premature EOF parsing tar file"))) | |
461 | (set-buffer-multibyte default-enable-multibyte-characters) | |
aa73f29c | 462 | (goto-char (point-min)) |
8560523d | 463 | (let ((inhibit-read-only t)) |
a728aa90 RS |
464 | ;; Collect summary lines and insert them all at once since tar files |
465 | ;; can be pretty big. | |
8560523d SM |
466 | (let ((total-summaries |
467 | (mapconcat | |
468 | (lambda (tar-desc) | |
469 | (tar-header-block-summarize (tar-desc-tokens tar-desc))) | |
470 | tar-parse-info | |
471 | "\n"))) | |
472 | (insert total-summaries "\n")) | |
473 | (narrow-to-region (point-min) (point)) | |
474 | (set (make-local-variable 'tar-header-offset) (position-bytes (point))) | |
475 | (goto-char (point-min)) | |
476 | (restore-buffer-modified-p modified)))) | |
e865c5ce | 477 | \f |
8560523d SM |
478 | (defvar tar-mode-map |
479 | (let ((map (make-keymap))) | |
480 | (suppress-keymap map) | |
481 | (define-key map " " 'tar-next-line) | |
482 | (define-key map "C" 'tar-copy) | |
483 | (define-key map "d" 'tar-flag-deleted) | |
484 | (define-key map "\^D" 'tar-flag-deleted) | |
485 | (define-key map "e" 'tar-extract) | |
486 | (define-key map "f" 'tar-extract) | |
487 | (define-key map "\C-m" 'tar-extract) | |
488 | (define-key map [mouse-2] 'tar-mouse-extract) | |
489 | (define-key map "g" 'revert-buffer) | |
490 | (define-key map "h" 'describe-mode) | |
491 | (define-key map "n" 'tar-next-line) | |
492 | (define-key map "\^N" 'tar-next-line) | |
493 | (define-key map [down] 'tar-next-line) | |
494 | (define-key map "o" 'tar-extract-other-window) | |
495 | (define-key map "p" 'tar-previous-line) | |
496 | (define-key map "q" 'quit-window) | |
497 | (define-key map "\^P" 'tar-previous-line) | |
498 | (define-key map [up] 'tar-previous-line) | |
499 | (define-key map "R" 'tar-rename-entry) | |
500 | (define-key map "u" 'tar-unflag) | |
501 | (define-key map "v" 'tar-view) | |
502 | (define-key map "x" 'tar-expunge) | |
503 | (define-key map "\177" 'tar-unflag-backwards) | |
504 | (define-key map "E" 'tar-extract-other-window) | |
505 | (define-key map "M" 'tar-chmod-entry) | |
506 | (define-key map "G" 'tar-chgrp-entry) | |
507 | (define-key map "O" 'tar-chown-entry) | |
508 | ||
509 | ;; Make menu bar items. | |
510 | ||
511 | ;; Get rid of the Edit menu bar item to save space. | |
512 | (define-key map [menu-bar edit] 'undefined) | |
513 | ||
514 | (define-key map [menu-bar immediate] | |
515 | (cons "Immediate" (make-sparse-keymap "Immediate"))) | |
516 | ||
517 | (define-key map [menu-bar immediate view] | |
518 | '("View This File" . tar-view)) | |
519 | (define-key map [menu-bar immediate display] | |
520 | '("Display in Other Window" . tar-display-other-window)) | |
521 | (define-key map [menu-bar immediate find-file-other-window] | |
522 | '("Find in Other Window" . tar-extract-other-window)) | |
523 | (define-key map [menu-bar immediate find-file] | |
524 | '("Find This File" . tar-extract)) | |
525 | ||
526 | (define-key map [menu-bar mark] | |
527 | (cons "Mark" (make-sparse-keymap "Mark"))) | |
528 | ||
529 | (define-key map [menu-bar mark unmark-all] | |
530 | '("Unmark All" . tar-clear-modification-flags)) | |
531 | (define-key map [menu-bar mark deletion] | |
532 | '("Flag" . tar-flag-deleted)) | |
533 | (define-key map [menu-bar mark unmark] | |
534 | '("Unflag" . tar-unflag)) | |
535 | ||
536 | (define-key map [menu-bar operate] | |
537 | (cons "Operate" (make-sparse-keymap "Operate"))) | |
538 | ||
539 | (define-key map [menu-bar operate chown] | |
540 | '("Change Owner..." . tar-chown-entry)) | |
541 | (define-key map [menu-bar operate chgrp] | |
542 | '("Change Group..." . tar-chgrp-entry)) | |
543 | (define-key map [menu-bar operate chmod] | |
544 | '("Change Mode..." . tar-chmod-entry)) | |
545 | (define-key map [menu-bar operate rename] | |
546 | '("Rename to..." . tar-rename-entry)) | |
547 | (define-key map [menu-bar operate copy] | |
548 | '("Copy to..." . tar-copy)) | |
549 | (define-key map [menu-bar operate expunge] | |
550 | '("Expunge Marked Files" . tar-expunge)) | |
551 | ||
552 | map) | |
553 | "Local keymap for Tar mode listings.") | |
554 | ||
e865c5ce | 555 | \f |
aa73f29c RS |
556 | ;; tar mode is suitable only for specially formatted data. |
557 | (put 'tar-mode 'mode-class 'special) | |
558 | (put 'tar-subfile-mode 'mode-class 'special) | |
559 | ||
bdd53bbc | 560 | ;;;###autoload |
a91c76d6 | 561 | (define-derived-mode tar-mode nil "Tar" |
aa73f29c | 562 | "Major mode for viewing a tar file as a dired-like listing of its contents. |
f1180544 | 563 | You can move around using the usual cursor motion commands. |
aa73f29c | 564 | Letters no longer insert themselves. |
439fa06f RS |
565 | Type `e' to pull a file out of the tar file and into its own buffer; |
566 | or click mouse-2 on the file's line in the Tar mode buffer. | |
e865c5ce | 567 | Type `c' to copy an entry from the tar file into another file on disk. |
aa73f29c | 568 | |
f1180544 | 569 | If you edit a sub-file of this archive (as with the `e' command) and |
8560523d | 570 | save it with \\[save-buffer], the contents of that buffer will be |
f1180544 | 571 | saved back into the tar-file buffer; in this way you can edit a file |
aa73f29c RS |
572 | inside of a tar archive without extracting it and re-archiving it. |
573 | ||
e865c5ce | 574 | See also: variables `tar-update-datestamp' and `tar-anal-blocksize'. |
aa73f29c RS |
575 | \\{tar-mode-map}" |
576 | ;; this is not interactive because you shouldn't be turning this | |
577 | ;; mode on and off. You can corrupt things that way. | |
1c0b3743 RS |
578 | ;; rms: with permanent locals, it should now be possible to make this work |
579 | ;; interactively in some reasonable fashion. | |
aa73f29c RS |
580 | (make-local-variable 'tar-header-offset) |
581 | (make-local-variable 'tar-parse-info) | |
a91c76d6 SM |
582 | (set (make-local-variable 'require-final-newline) nil) ; binary data, dude... |
583 | (set (make-local-variable 'revert-buffer-function) 'tar-mode-revert) | |
584 | (set (make-local-variable 'local-enable-local-variables) nil) | |
585 | (set (make-local-variable 'next-line-add-newlines) nil) | |
b9ca3cdb | 586 | ;; Prevent loss of data when saving the file. |
a91c76d6 | 587 | (set (make-local-variable 'file-precious-flag) t) |
aa73f29c | 588 | (auto-save-mode 0) |
bea824fd | 589 | (set (make-local-variable 'write-contents-functions) '(tar-mode-write-file)) |
03b00795 | 590 | (buffer-disable-undo) |
aa73f29c RS |
591 | (widen) |
592 | (if (and (boundp 'tar-header-offset) tar-header-offset) | |
643415c4 | 593 | (narrow-to-region (point-min) (byte-to-position tar-header-offset)) |
a91c76d6 SM |
594 | (tar-summarize-buffer) |
595 | (tar-next-line 0))) | |
aa73f29c RS |
596 | |
597 | ||
598 | (defun tar-subfile-mode (p) | |
599 | "Minor mode for editing an element of a tar-file. | |
76605277 RS |
600 | This mode arranges for \"saving\" this buffer to write the data |
601 | into the tar-file buffer that it came from. The changes will actually | |
602 | appear on disk when you save the tar-file's buffer." | |
aa73f29c | 603 | (interactive "P") |
0f8becaa | 604 | (or (and (boundp 'tar-superior-buffer) tar-superior-buffer) |
e865c5ce | 605 | (error "This buffer is not an element of a tar file")) |
643415c4 SM |
606 | ;; Don't do this, because it is redundant and wastes mode line space. |
607 | ;; (or (assq 'tar-subfile-mode minor-mode-alist) | |
608 | ;; (setq minor-mode-alist (append minor-mode-alist | |
609 | ;; (list '(tar-subfile-mode " TarFile"))))) | |
aa73f29c RS |
610 | (make-local-variable 'tar-subfile-mode) |
611 | (setq tar-subfile-mode | |
612 | (if (null p) | |
613 | (not tar-subfile-mode) | |
614 | (> (prefix-numeric-value p) 0))) | |
615 | (cond (tar-subfile-mode | |
76bf6666 | 616 | (add-hook 'write-file-functions 'tar-subfile-save-buffer nil t) |
aa73f29c | 617 | ;; turn off auto-save. |
75238436 | 618 | (auto-save-mode -1) |
aa73f29c RS |
619 | (setq buffer-auto-save-file-name nil) |
620 | (run-hooks 'tar-subfile-mode-hook)) | |
e865c5ce | 621 | (t |
76bf6666 | 622 | (remove-hook 'write-file-functions 'tar-subfile-save-buffer t)))) |
aa73f29c RS |
623 | |
624 | ||
e865c5ce | 625 | ;; Revert the buffer and recompute the dired-like listing. |
f6b0805a | 626 | (defun tar-mode-revert (&optional no-auto-save no-confirm) |
3742f39f RS |
627 | (let ((revert-buffer-function nil) |
628 | (old-offset tar-header-offset) | |
629 | success) | |
630 | (setq tar-header-offset nil) | |
631 | (unwind-protect | |
632 | (and (revert-buffer t no-confirm) | |
633 | (progn (widen) | |
634 | (setq success t) | |
635 | (tar-mode))) | |
636 | ;; If the revert was canceled, | |
637 | ;; put back the old value of tar-header-offset. | |
638 | (or success | |
639 | (setq tar-header-offset old-offset))))) | |
aa73f29c RS |
640 | |
641 | ||
210f943e PJ |
642 | (defun tar-next-line (arg) |
643 | "Move cursor vertically down ARG lines and to the start of the filename." | |
aa73f29c | 644 | (interactive "p") |
210f943e | 645 | (forward-line arg) |
30712209 | 646 | (if (eobp) nil (forward-char (if tar-mode-show-date 54 36)))) |
aa73f29c | 647 | |
210f943e PJ |
648 | (defun tar-previous-line (arg) |
649 | "Move cursor vertically up ARG lines and to the start of the filename." | |
aa73f29c | 650 | (interactive "p") |
210f943e | 651 | (tar-next-line (- arg))) |
aa73f29c RS |
652 | |
653 | (defun tar-current-descriptor (&optional noerror) | |
e865c5ce | 654 | "Return the tar-descriptor of the current line, or signals an error." |
aa73f29c RS |
655 | ;; I wish lines had plists, like in ZMACS... |
656 | (or (nth (count-lines (point-min) | |
657 | (save-excursion (beginning-of-line) (point))) | |
658 | tar-parse-info) | |
659 | (if noerror | |
660 | nil | |
439fa06f | 661 | (error "This line does not describe a tar-file entry")))) |
aa73f29c | 662 | |
439fa06f RS |
663 | (defun tar-get-descriptor () |
664 | (let* ((descriptor (tar-current-descriptor)) | |
665 | (tokens (tar-desc-tokens descriptor)) | |
666 | (size (tar-header-size tokens)) | |
667 | (link-p (tar-header-link-type tokens))) | |
668 | (if link-p | |
2bff30c4 CY |
669 | (error "This is %s, not a real file" |
670 | (cond ((eq link-p 5) "a directory") | |
671 | ((eq link-p 20) "a tar directory header") | |
672 | ((eq link-p 28) "a next has longname") | |
673 | ((eq link-p 29) "a multivolume-continuation") | |
674 | ((eq link-p 35) "a sparse entry") | |
675 | ((eq link-p 38) "a volume header") | |
676 | ((eq link-p 55) "an extended pax header") | |
677 | (t "a link")))) | |
f09bbd93 | 678 | (if (zerop size) (message "This is a zero-length file")) |
439fa06f RS |
679 | descriptor)) |
680 | ||
681 | (defun tar-mouse-extract (event) | |
682 | "Extract a file whose tar directory line you click on." | |
683 | (interactive "e") | |
684 | (save-excursion | |
685 | (set-buffer (window-buffer (posn-window (event-end event)))) | |
686 | (save-excursion | |
687 | (goto-char (posn-point (event-end event))) | |
688 | ;; Just make sure this doesn't get an error. | |
689 | (tar-get-descriptor))) | |
690 | (select-window (posn-window (event-end event))) | |
691 | (goto-char (posn-point (event-end event))) | |
692 | (tar-extract)) | |
aa73f29c | 693 | |
db2ccbc2 EZ |
694 | (defun tar-file-name-handler (op &rest args) |
695 | "Helper function for `tar-extract'." | |
696 | (or (eq op 'file-exists-p) | |
697 | (let ((file-name-handler-alist nil)) | |
698 | (apply op args)))) | |
699 | ||
aa73f29c | 700 | (defun tar-extract (&optional other-window-p) |
628d6cef | 701 | "In Tar mode, extract this entry of the tar file into its own buffer." |
aa73f29c RS |
702 | (interactive) |
703 | (let* ((view-p (eq other-window-p 'view)) | |
439fa06f | 704 | (descriptor (tar-get-descriptor)) |
aa73f29c RS |
705 | (tokens (tar-desc-tokens descriptor)) |
706 | (name (tar-header-name tokens)) | |
707 | (size (tar-header-size tokens)) | |
643415c4 SM |
708 | (start (+ (tar-desc-data-start descriptor) |
709 | (- tar-header-offset (point-min)))) | |
aa73f29c | 710 | (end (+ start size))) |
aa73f29c | 711 | (let* ((tar-buffer (current-buffer)) |
1b33e237 | 712 | (tar-buffer-multibyte enable-multibyte-characters) |
38c6e0c7 | 713 | (tarname (buffer-name)) |
e8421604 GM |
714 | (bufname (concat (file-name-nondirectory name) |
715 | " (" | |
6da7ea56 | 716 | tarname |
e8421604 | 717 | ")")) |
aa73f29c | 718 | (read-only-p (or buffer-read-only view-p)) |
38c6e0c7 AS |
719 | (new-buffer-file-name (expand-file-name |
720 | ;; `:' is not allowed on Windows | |
e8421604 GM |
721 | (concat tarname "!" name))) |
722 | (buffer (get-file-buffer new-buffer-file-name)) | |
723 | (just-created nil)) | |
724 | (unless buffer | |
38c6e0c7 AS |
725 | (setq buffer (generate-new-buffer bufname)) |
726 | (setq bufname (buffer-name buffer)) | |
aa73f29c RS |
727 | (setq just-created t) |
728 | (unwind-protect | |
729 | (progn | |
730 | (widen) | |
1b33e237 | 731 | (set-buffer-multibyte nil) |
aa73f29c RS |
732 | (save-excursion |
733 | (set-buffer buffer) | |
5b0102e2 RS |
734 | (let ((buffer-undo-list t)) |
735 | (if enable-multibyte-characters | |
736 | (progn | |
737 | ;; We must avoid unibyte->multibyte conversion. | |
738 | (set-buffer-multibyte nil) | |
739 | (insert-buffer-substring tar-buffer start end) | |
740 | (set-buffer-multibyte t)) | |
741 | (insert-buffer-substring tar-buffer start end)) | |
742 | (goto-char (point-min)) | |
743 | (setq buffer-file-name new-buffer-file-name) | |
744 | (setq buffer-file-truename | |
745 | (abbreviate-file-name buffer-file-name)) | |
746 | ;; We need to mimic the parts of insert-file-contents | |
747 | ;; which determine the coding-system and decode the text. | |
748 | (let ((coding | |
749 | (or coding-system-for-read | |
750 | (and set-auto-coding-function | |
751 | (save-excursion | |
752 | (funcall set-auto-coding-function | |
39925f56 | 753 | name (- (point-max) (point))))) |
db2ccbc2 EZ |
754 | ;; The following binding causes |
755 | ;; find-buffer-file-type-coding-system | |
756 | ;; (defined on dos-w32.el) to act as if | |
757 | ;; the file being extracted existed, so | |
758 | ;; that the file's contents' encoding and | |
759 | ;; EOL format are auto-detected. | |
760 | (let ((file-name-handler-alist | |
761 | (if (featurep 'dos-w32) | |
762 | '(("" . tar-file-name-handler)) | |
763 | file-name-handler-alist))) | |
764 | (car (find-operation-coding-system | |
765 | 'insert-file-contents | |
766 | (cons name (current-buffer)) t))))) | |
5b0102e2 RS |
767 | (multibyte enable-multibyte-characters) |
768 | (detected (detect-coding-region | |
769 | (point-min) | |
770 | (min (+ (point-min) 16384) (point-max)) t))) | |
771 | (if coding | |
772 | (or (numberp (coding-system-eol-type coding)) | |
773 | (vectorp (coding-system-eol-type detected)) | |
774 | (setq coding (coding-system-change-eol-conversion | |
775 | coding | |
776 | (coding-system-eol-type detected)))) | |
47414bc1 | 777 | (setq coding |
39925f56 | 778 | (find-new-buffer-file-coding-system detected))) |
5b0102e2 RS |
779 | (if (or (eq coding 'no-conversion) |
780 | (eq (coding-system-type coding) 5)) | |
781 | (setq multibyte (set-buffer-multibyte nil))) | |
782 | (or multibyte | |
783 | (setq coding | |
784 | (coding-system-change-text-conversion | |
785 | coding 'raw-text))) | |
786 | (decode-coding-region (point-min) (point-max) coding) | |
db2ccbc2 EZ |
787 | ;; Force buffer-file-coding-system to what |
788 | ;; decode-coding-region actually used. | |
789 | (set-buffer-file-coding-system last-coding-system-used t)) | |
5b0102e2 RS |
790 | ;; Set the default-directory to the dir of the |
791 | ;; superior buffer. | |
792 | (setq default-directory | |
793 | (save-excursion | |
794 | (set-buffer tar-buffer) | |
795 | default-directory)) | |
796 | (normal-mode) ; pick a mode. | |
797 | (rename-buffer bufname) | |
798 | (make-local-variable 'tar-superior-buffer) | |
799 | (make-local-variable 'tar-superior-descriptor) | |
800 | (setq tar-superior-buffer tar-buffer) | |
801 | (setq tar-superior-descriptor descriptor) | |
802 | (setq buffer-read-only read-only-p) | |
803 | (set-buffer-modified-p nil)) | |
76605277 | 804 | (tar-subfile-mode 1)) |
aa73f29c | 805 | (set-buffer tar-buffer)) |
643415c4 | 806 | (narrow-to-region (point-min) tar-header-offset) |
1b33e237 | 807 | (set-buffer-multibyte tar-buffer-multibyte))) |
aa73f29c | 808 | (if view-p |
3eb37b08 | 809 | (view-buffer buffer (and just-created 'kill-buffer)) |
e865c5ce RS |
810 | (if (eq other-window-p 'display) |
811 | (display-buffer buffer) | |
812 | (if other-window-p | |
813 | (switch-to-buffer-other-window buffer) | |
814 | (switch-to-buffer buffer))))))) | |
aa73f29c RS |
815 | |
816 | ||
817 | (defun tar-extract-other-window () | |
8560523d | 818 | "In Tar mode, find this entry of the tar file in another window." |
aa73f29c RS |
819 | (interactive) |
820 | (tar-extract t)) | |
821 | ||
e865c5ce | 822 | (defun tar-display-other-window () |
8560523d | 823 | "In Tar mode, display this entry of the tar file in another window." |
e865c5ce RS |
824 | (interactive) |
825 | (tar-extract 'display)) | |
826 | ||
aa73f29c | 827 | (defun tar-view () |
8560523d | 828 | "In Tar mode, view the tar file entry on this line." |
aa73f29c RS |
829 | (interactive) |
830 | (tar-extract 'view)) | |
831 | ||
832 | ||
833 | (defun tar-read-file-name (&optional prompt) | |
e865c5ce | 834 | "Read a file name with this line's entry as the default." |
aa73f29c RS |
835 | (or prompt (setq prompt "Copy to: ")) |
836 | (let* ((default-file (expand-file-name | |
837 | (tar-header-name (tar-desc-tokens | |
838 | (tar-current-descriptor))))) | |
839 | (target (expand-file-name | |
840 | (read-file-name prompt | |
841 | (file-name-directory default-file) | |
842 | default-file nil)))) | |
843 | (if (or (string= "" (file-name-nondirectory target)) | |
844 | (file-directory-p target)) | |
845 | (setq target (concat (if (string-match "/$" target) | |
846 | (substring target 0 (1- (match-end 0))) | |
847 | target) | |
848 | "/" | |
849 | (file-name-nondirectory default-file)))) | |
850 | target)) | |
851 | ||
852 | ||
853 | (defun tar-copy (&optional to-file) | |
8560523d | 854 | "In Tar mode, extract this entry of the tar file into a file on disk. |
aa73f29c RS |
855 | If TO-FILE is not supplied, it is prompted for, defaulting to the name of |
856 | the current tar-entry." | |
857 | (interactive (list (tar-read-file-name))) | |
439fa06f | 858 | (let* ((descriptor (tar-get-descriptor)) |
aa73f29c RS |
859 | (tokens (tar-desc-tokens descriptor)) |
860 | (name (tar-header-name tokens)) | |
861 | (size (tar-header-size tokens)) | |
643415c4 SM |
862 | (start (+ (tar-desc-data-start descriptor) |
863 | (- tar-header-offset (point-min)))) | |
d4ec0200 | 864 | (end (+ start size)) |
1b33e237 | 865 | (multibyte enable-multibyte-characters) |
d4ec0200 RS |
866 | (inhibit-file-name-handlers inhibit-file-name-handlers) |
867 | (inhibit-file-name-operation inhibit-file-name-operation)) | |
6a608e8e KH |
868 | (save-restriction |
869 | (widen) | |
d4ec0200 RS |
870 | ;; Inhibit compressing a subfile again if *both* name and |
871 | ;; to-file are handled by jka-compr | |
872 | (if (and (eq (find-file-name-handler name 'write-region) 'jka-compr-handler) | |
873 | (eq (find-file-name-handler to-file 'write-region) 'jka-compr-handler)) | |
874 | (setq inhibit-file-name-handlers | |
875 | (cons 'jka-compr-handler | |
876 | (and (eq inhibit-file-name-operation 'write-region) | |
877 | inhibit-file-name-handlers)) | |
878 | inhibit-file-name-operation 'write-region)) | |
1b33e237 KH |
879 | (unwind-protect |
880 | (let ((coding-system-for-write 'no-conversion)) | |
881 | (set-buffer-multibyte nil) | |
5ee42746 | 882 | (write-region start end to-file nil nil nil t)) |
1b33e237 | 883 | (set-buffer-multibyte multibyte))) |
6a608e8e | 884 | (message "Copied tar entry %s to %s" name to-file))) |
aa73f29c RS |
885 | |
886 | (defun tar-flag-deleted (p &optional unflag) | |
8560523d | 887 | "In Tar mode, mark this sub-file to be deleted from the tar file. |
aa73f29c RS |
888 | With a prefix argument, mark that many files." |
889 | (interactive "p") | |
890 | (beginning-of-line) | |
8560523d | 891 | (dotimes (i (abs p)) |
aa73f29c RS |
892 | (if (tar-current-descriptor unflag) ; barf if we're not on an entry-line. |
893 | (progn | |
894 | (delete-char 1) | |
895 | (insert (if unflag " " "D")))) | |
896 | (forward-line (if (< p 0) -1 1))) | |
897 | (if (eobp) nil (forward-char 36))) | |
898 | ||
899 | (defun tar-unflag (p) | |
8560523d | 900 | "In Tar mode, un-mark this sub-file if it is marked to be deleted. |
aa73f29c RS |
901 | With a prefix argument, un-mark that many files forward." |
902 | (interactive "p") | |
903 | (tar-flag-deleted p t)) | |
904 | ||
905 | (defun tar-unflag-backwards (p) | |
8560523d | 906 | "In Tar mode, un-mark this sub-file if it is marked to be deleted. |
aa73f29c RS |
907 | With a prefix argument, un-mark that many files backward." |
908 | (interactive "p") | |
909 | (tar-flag-deleted (- p) t)) | |
910 | ||
911 | ||
1b33e237 | 912 | ;; When this function is called, it is sure that the buffer is unibyte. |
aa73f29c RS |
913 | (defun tar-expunge-internal () |
914 | "Expunge the tar-entry specified by the current line." | |
915 | (let* ((descriptor (tar-current-descriptor)) | |
916 | (tokens (tar-desc-tokens descriptor)) | |
8560523d | 917 | ;; (line (tar-desc-data-start descriptor)) |
aa73f29c RS |
918 | (name (tar-header-name tokens)) |
919 | (size (tar-header-size tokens)) | |
920 | (link-p (tar-header-link-type tokens)) | |
921 | (start (tar-desc-data-start descriptor)) | |
922 | (following-descs (cdr (memq descriptor tar-parse-info)))) | |
923 | (if link-p (setq size 0)) ; size lies for hard-links. | |
924 | ;; | |
925 | ;; delete the current line... | |
926 | (beginning-of-line) | |
927 | (let ((line-start (point))) | |
928 | (end-of-line) (forward-char) | |
8560523d SM |
929 | ;; decrement the header-pointer to be in sync... |
930 | (setq tar-header-offset (- tar-header-offset (- (point) line-start))) | |
931 | (delete-region line-start (point))) | |
aa73f29c RS |
932 | ;; |
933 | ;; delete the data pointer... | |
934 | (setq tar-parse-info (delq descriptor tar-parse-info)) | |
935 | ;; | |
936 | ;; delete the data from inside the file... | |
937 | (widen) | |
8560523d | 938 | (let* ((data-start (+ start (- tar-header-offset (point-min)) -512)) |
aa73f29c RS |
939 | (data-end (+ data-start 512 (ash (ash (+ size 511) -9) 9)))) |
940 | (delete-region data-start data-end) | |
941 | ;; | |
942 | ;; and finally, decrement the start-pointers of all following | |
943 | ;; entries in the archive. This is a pig when deleting a bunch | |
944 | ;; of files at once - we could optimize this to only do the | |
945 | ;; iteration over the files that remain, or only iterate up to | |
946 | ;; the next file to be deleted. | |
947 | (let ((data-length (- data-end data-start))) | |
048d06bd | 948 | (dolist (desc following-descs) |
aa73f29c RS |
949 | (tar-setf (tar-desc-data-start desc) |
950 | (- (tar-desc-data-start desc) data-length)))) | |
951 | )) | |
643415c4 | 952 | (narrow-to-region (point-min) tar-header-offset)) |
aa73f29c RS |
953 | |
954 | ||
955 | (defun tar-expunge (&optional noconfirm) | |
8560523d | 956 | "In Tar mode, delete all the archived files flagged for deletion. |
aa73f29c RS |
957 | This does not modify the disk image; you must save the tar file itself |
958 | for this to be permanent." | |
959 | (interactive) | |
960 | (if (or noconfirm | |
67501c01 | 961 | (y-or-n-p "Expunge files marked for deletion? ")) |
1b33e237 KH |
962 | (let ((n 0) |
963 | (multibyte enable-multibyte-characters)) | |
aa73f29c | 964 | (save-excursion |
8560523d SM |
965 | (widen) |
966 | (set-buffer-multibyte nil) | |
cb33a0ce | 967 | (goto-char (point-min)) |
aa73f29c RS |
968 | (while (not (eobp)) |
969 | (if (looking-at "D") | |
970 | (progn (tar-expunge-internal) | |
971 | (setq n (1+ n))) | |
972 | (forward-line 1))) | |
973 | ;; after doing the deletions, add any padding that may be necessary. | |
974 | (tar-pad-to-blocksize) | |
8560523d SM |
975 | (widen) |
976 | (set-buffer-multibyte multibyte) | |
643415c4 | 977 | (narrow-to-region (point-min) tar-header-offset)) |
aa73f29c | 978 | (if (zerop n) |
67501c01 RS |
979 | (message "Nothing to expunge.") |
980 | (message "%s files expunged. Be sure to save this buffer." n))))) | |
aa73f29c RS |
981 | |
982 | ||
983 | (defun tar-clear-modification-flags () | |
e865c5ce | 984 | "Remove the stars at the beginning of each line." |
a7e5e8cb | 985 | (interactive) |
aa73f29c | 986 | (save-excursion |
cb33a0ce | 987 | (goto-char (point-min)) |
1b33e237 | 988 | (while (< (position-bytes (point)) tar-header-offset) |
e5d56b61 | 989 | (if (not (eq (following-char) ?\s)) |
aa73f29c RS |
990 | (progn (delete-char 1) (insert " "))) |
991 | (forward-line 1)))) | |
992 | ||
993 | ||
994 | (defun tar-chown-entry (new-uid) | |
8560523d | 995 | "Change the user-id associated with this entry in the tar file. |
aa73f29c RS |
996 | If this tar file was written by GNU tar, then you will be able to edit |
997 | the user id as a string; otherwise, you must edit it as a number. | |
998 | You can force editing as a number by calling this with a prefix arg. | |
999 | This does not modify the disk image; you must save the tar file itself | |
1000 | for this to be permanent." | |
1001 | (interactive (list | |
1002 | (let ((tokens (tar-desc-tokens (tar-current-descriptor)))) | |
1003 | (if (or current-prefix-arg | |
1004 | (not (tar-header-magic tokens))) | |
1005 | (let (n) | |
1006 | (while (not (numberp (setq n (read-minibuffer | |
1007 | "New UID number: " | |
1008 | (format "%s" (tar-header-uid tokens))))))) | |
1009 | n) | |
1010 | (read-string "New UID string: " (tar-header-uname tokens)))))) | |
1011 | (cond ((stringp new-uid) | |
1012 | (tar-setf (tar-header-uname (tar-desc-tokens (tar-current-descriptor))) | |
1013 | new-uid) | |
1014 | (tar-alter-one-field tar-uname-offset (concat new-uid "\000"))) | |
1015 | (t | |
1016 | (tar-setf (tar-header-uid (tar-desc-tokens (tar-current-descriptor))) | |
1017 | new-uid) | |
1018 | (tar-alter-one-field tar-uid-offset | |
1019 | (concat (substring (format "%6o" new-uid) 0 6) "\000 "))))) | |
1020 | ||
1021 | ||
1022 | (defun tar-chgrp-entry (new-gid) | |
8560523d | 1023 | "Change the group-id associated with this entry in the tar file. |
aa73f29c RS |
1024 | If this tar file was written by GNU tar, then you will be able to edit |
1025 | the group id as a string; otherwise, you must edit it as a number. | |
1026 | You can force editing as a number by calling this with a prefix arg. | |
1027 | This does not modify the disk image; you must save the tar file itself | |
1028 | for this to be permanent." | |
1029 | (interactive (list | |
1030 | (let ((tokens (tar-desc-tokens (tar-current-descriptor)))) | |
1031 | (if (or current-prefix-arg | |
1032 | (not (tar-header-magic tokens))) | |
1033 | (let (n) | |
1034 | (while (not (numberp (setq n (read-minibuffer | |
1035 | "New GID number: " | |
1036 | (format "%s" (tar-header-gid tokens))))))) | |
1037 | n) | |
1038 | (read-string "New GID string: " (tar-header-gname tokens)))))) | |
1039 | (cond ((stringp new-gid) | |
1040 | (tar-setf (tar-header-gname (tar-desc-tokens (tar-current-descriptor))) | |
1041 | new-gid) | |
1042 | (tar-alter-one-field tar-gname-offset | |
1043 | (concat new-gid "\000"))) | |
1044 | (t | |
1045 | (tar-setf (tar-header-gid (tar-desc-tokens (tar-current-descriptor))) | |
1046 | new-gid) | |
1047 | (tar-alter-one-field tar-gid-offset | |
1048 | (concat (substring (format "%6o" new-gid) 0 6) "\000 "))))) | |
1049 | ||
1050 | (defun tar-rename-entry (new-name) | |
8560523d | 1051 | "Change the name associated with this entry in the tar file. |
aa73f29c RS |
1052 | This does not modify the disk image; you must save the tar file itself |
1053 | for this to be permanent." | |
1054 | (interactive | |
1055 | (list (read-string "New name: " | |
1056 | (tar-header-name (tar-desc-tokens (tar-current-descriptor)))))) | |
439fa06f RS |
1057 | (if (string= "" new-name) (error "zero length name")) |
1058 | (if (> (length new-name) 98) (error "name too long")) | |
aa73f29c RS |
1059 | (tar-setf (tar-header-name (tar-desc-tokens (tar-current-descriptor))) |
1060 | new-name) | |
8560523d SM |
1061 | (if (multibyte-string-p new-name) |
1062 | (setq new-name (encode-coding-string new-name | |
1063 | (or file-name-coding-system | |
1064 | default-file-name-coding-system)))) | |
aa73f29c RS |
1065 | (tar-alter-one-field 0 |
1066 | (substring (concat new-name (make-string 99 0)) 0 99))) | |
1067 | ||
1068 | ||
1069 | (defun tar-chmod-entry (new-mode) | |
8560523d | 1070 | "Change the protection bits associated with this entry in the tar file. |
aa73f29c RS |
1071 | This does not modify the disk image; you must save the tar file itself |
1072 | for this to be permanent." | |
1073 | (interactive (list (tar-parse-octal-integer-safe | |
1074 | (read-string "New protection (octal): ")))) | |
1075 | (tar-setf (tar-header-mode (tar-desc-tokens (tar-current-descriptor))) | |
1076 | new-mode) | |
1077 | (tar-alter-one-field tar-mode-offset | |
1078 | (concat (substring (format "%6o" new-mode) 0 6) "\000 "))) | |
1079 | ||
1080 | ||
1081 | (defun tar-alter-one-field (data-position new-data-string) | |
1082 | (let* ((descriptor (tar-current-descriptor)) | |
1b33e237 KH |
1083 | (tokens (tar-desc-tokens descriptor)) |
1084 | (multibyte enable-multibyte-characters)) | |
aa73f29c RS |
1085 | (unwind-protect |
1086 | (save-excursion | |
1087 | ;; | |
1088 | ;; update the header-line. | |
1089 | (beginning-of-line) | |
1090 | (let ((p (point))) | |
1091 | (forward-line 1) | |
1092 | (delete-region p (point)) | |
1bc28099 | 1093 | (insert (tar-header-block-summarize tokens) "\n") |
1b33e237 | 1094 | (setq tar-header-offset (position-bytes (point-max)))) |
f1180544 | 1095 | |
aa73f29c | 1096 | (widen) |
1b33e237 | 1097 | (set-buffer-multibyte nil) |
8560523d SM |
1098 | (let* ((start (+ (tar-desc-data-start descriptor) |
1099 | (- tar-header-offset (point-min)) | |
1100 | -512))) | |
aa73f29c RS |
1101 | ;; |
1102 | ;; delete the old field and insert a new one. | |
1103 | (goto-char (+ start data-position)) | |
1104 | (delete-region (point) (+ (point) (length new-data-string))) ; <-- | |
1105 | (insert new-data-string) ; <-- | |
1106 | ;; | |
1107 | ;; compute a new checksum and insert it. | |
1bc28099 | 1108 | (let ((chk (tar-header-block-checksum |
aa73f29c RS |
1109 | (buffer-substring start (+ start 512))))) |
1110 | (goto-char (+ start tar-chk-offset)) | |
1111 | (delete-region (point) (+ (point) 8)) | |
1112 | (insert (format "%6o" chk)) | |
1113 | (insert 0) | |
1114 | (insert ? ) | |
1115 | (tar-setf (tar-header-checksum tokens) chk) | |
1116 | ;; | |
1117 | ;; ok, make sure we didn't botch it. | |
d246db94 | 1118 | (tar-header-block-check-checksum |
aa73f29c RS |
1119 | (buffer-substring start (+ start 512)) |
1120 | chk (tar-header-name tokens)) | |
1121 | ))) | |
643415c4 | 1122 | (narrow-to-region (point-min) tar-header-offset) |
1b33e237 | 1123 | (set-buffer-multibyte multibyte) |
47414bc1 | 1124 | (tar-next-line 0)))) |
aa73f29c RS |
1125 | |
1126 | ||
3d7fc2fb ER |
1127 | (defun tar-octal-time (timeval) |
1128 | ;; Format a timestamp as 11 octal digits. Ghod, I hope this works... | |
1129 | (let ((hibits (car timeval)) (lobits (car (cdr timeval)))) | |
516f7fca EZ |
1130 | (format "%05o%01o%05o" |
1131 | (lsh hibits -2) | |
1132 | (logior (lsh (logand 3 hibits) 1) | |
1133 | (if (> (logand lobits 32768) 0) 1 0)) | |
1134 | (logand 32767 lobits) | |
1135 | ))) | |
3d7fc2fb | 1136 | |
aa73f29c | 1137 | (defun tar-subfile-save-buffer () |
e865c5ce RS |
1138 | "In tar subfile mode, save this buffer into its parent tar-file buffer. |
1139 | This doesn't write anything to disk; you must save the parent tar-file buffer | |
aa73f29c RS |
1140 | to make your changes permanent." |
1141 | (interactive) | |
0f8becaa | 1142 | (if (not (and (boundp 'tar-superior-buffer) tar-superior-buffer)) |
439fa06f | 1143 | (error "This buffer has no superior tar file buffer")) |
0f8becaa | 1144 | (if (not (and (boundp 'tar-superior-descriptor) tar-superior-descriptor)) |
439fa06f | 1145 | (error "This buffer doesn't have an index into its superior tar file!")) |
aa73f29c RS |
1146 | (save-excursion |
1147 | (let ((subfile (current-buffer)) | |
1b33e237 | 1148 | (subfile-multibyte enable-multibyte-characters) |
47414bc1 | 1149 | (coding buffer-file-coding-system) |
1b33e237 KH |
1150 | (descriptor tar-superior-descriptor) |
1151 | subfile-size) | |
1152 | ;; We must make the current buffer unibyte temporarily to avoid | |
f38cec78 | 1153 | ;; multibyte->unibyte conversion in `insert-buffer-substring'. |
1b33e237 KH |
1154 | (set-buffer-multibyte nil) |
1155 | (setq subfile-size (buffer-size)) | |
0f8becaa | 1156 | (set-buffer tar-superior-buffer) |
aa73f29c RS |
1157 | (let* ((tokens (tar-desc-tokens descriptor)) |
1158 | (start (tar-desc-data-start descriptor)) | |
1159 | (name (tar-header-name tokens)) | |
1160 | (size (tar-header-size tokens)) | |
1161 | (size-pad (ash (ash (+ size 511) -9) 9)) | |
1162 | (head (memq descriptor tar-parse-info)) | |
1b33e237 KH |
1163 | (following-descs (cdr head)) |
1164 | (tar-buffer-multibyte enable-multibyte-characters)) | |
aa73f29c RS |
1165 | (if (not head) |
1166 | (error "Can't find this tar file entry in its parent tar file!")) | |
1167 | (unwind-protect | |
1168 | (save-excursion | |
1169 | (widen) | |
1b33e237 | 1170 | (set-buffer-multibyte nil) |
aa73f29c | 1171 | ;; delete the old data... |
643415c4 | 1172 | (let* ((data-start (+ start (- tar-header-offset (point-min)))) |
aa73f29c RS |
1173 | (data-end (+ data-start (ash (ash (+ size 511) -9) 9)))) |
1174 | (delete-region data-start data-end) | |
1175 | ;; insert the new data... | |
1176 | (goto-char data-start) | |
f38cec78 | 1177 | (insert-buffer-substring subfile) |
47414bc1 RS |
1178 | (setq subfile-size |
1179 | (encode-coding-region | |
1180 | data-start (+ data-start subfile-size) coding)) | |
aa73f29c RS |
1181 | ;; |
1182 | ;; pad the new data out to a multiple of 512... | |
1183 | (let ((subfile-size-pad (ash (ash (+ subfile-size 511) -9) 9))) | |
1184 | (goto-char (+ data-start subfile-size)) | |
1185 | (insert (make-string (- subfile-size-pad subfile-size) 0)) | |
1186 | ;; | |
1187 | ;; update the data pointer of this and all following files... | |
1188 | (tar-setf (tar-header-size tokens) subfile-size) | |
1189 | (let ((difference (- subfile-size-pad size-pad))) | |
048d06bd | 1190 | (dolist (desc following-descs) |
aa73f29c RS |
1191 | (tar-setf (tar-desc-data-start desc) |
1192 | (+ (tar-desc-data-start desc) difference)))) | |
1193 | ;; | |
1194 | ;; Update the size field in the header block. | |
1195 | (let ((header-start (- data-start 512))) | |
1196 | (goto-char (+ header-start tar-size-offset)) | |
1197 | (delete-region (point) (+ (point) 12)) | |
1198 | (insert (format "%11o" subfile-size)) | |
1199 | (insert ? ) | |
1200 | ;; | |
1201 | ;; Maybe update the datestamp. | |
1202 | (if (not tar-update-datestamp) | |
1203 | nil | |
1204 | (goto-char (+ header-start tar-time-offset)) | |
1205 | (delete-region (point) (+ (point) 12)) | |
3d7fc2fb | 1206 | (insert (tar-octal-time (current-time))) |
aa73f29c RS |
1207 | (insert ? )) |
1208 | ;; | |
1209 | ;; compute a new checksum and insert it. | |
1bc28099 | 1210 | (let ((chk (tar-header-block-checksum |
aa73f29c RS |
1211 | (buffer-substring header-start data-start)))) |
1212 | (goto-char (+ header-start tar-chk-offset)) | |
1213 | (delete-region (point) (+ (point) 8)) | |
1214 | (insert (format "%6o" chk)) | |
1215 | (insert 0) | |
1216 | (insert ? ) | |
1217 | (tar-setf (tar-header-checksum tokens) chk))) | |
1218 | ;; | |
1219 | ;; alter the descriptor-line... | |
1220 | ;; | |
1221 | (let ((position (- (length tar-parse-info) (length head)))) | |
cb33a0ce | 1222 | (goto-char (point-min)) |
aa73f29c RS |
1223 | (next-line position) |
1224 | (beginning-of-line) | |
1225 | (let ((p (point)) | |
97590737 | 1226 | after |
aa73f29c RS |
1227 | (m (set-marker (make-marker) tar-header-offset))) |
1228 | (forward-line 1) | |
97590737 RS |
1229 | (setq after (point)) |
1230 | ;; Insert the new text after the old, before deleting, | |
1231 | ;; to preserve the window start. | |
1b33e237 | 1232 | (let ((line (tar-header-block-summarize tokens t))) |
8560523d | 1233 | (insert-before-markers (string-as-unibyte line) "\n")) |
97590737 | 1234 | (delete-region p after) |
aa73f29c RS |
1235 | (setq tar-header-offset (marker-position m))) |
1236 | ))) | |
1237 | ;; after doing the insertion, add any final padding that may be necessary. | |
1238 | (tar-pad-to-blocksize)) | |
643415c4 | 1239 | (narrow-to-region (point-min) tar-header-offset) |
1b33e237 | 1240 | (set-buffer-multibyte tar-buffer-multibyte))) |
aa73f29c | 1241 | (set-buffer-modified-p t) ; mark the tar file as modified |
47414bc1 | 1242 | (tar-next-line 0) |
aa73f29c | 1243 | (set-buffer subfile) |
1b33e237 KH |
1244 | ;; Restore the buffer multibyteness. |
1245 | (set-buffer-multibyte subfile-multibyte) | |
aa73f29c | 1246 | (set-buffer-modified-p nil) ; mark the tar subfile as unmodified |
67501c01 | 1247 | (message "Saved into tar-buffer `%s'. Be sure to save that buffer!" |
0f8becaa | 1248 | (buffer-name tar-superior-buffer)) |
47414bc1 RS |
1249 | ;; Prevent basic-save-buffer from changing our coding-system. |
1250 | (setq last-coding-system-used buffer-file-coding-system) | |
e865c5ce RS |
1251 | ;; Prevent ordinary saving from happening. |
1252 | t))) | |
aa73f29c RS |
1253 | |
1254 | ||
1b33e237 | 1255 | ;; When this function is called, it is sure that the buffer is unibyte. |
aa73f29c RS |
1256 | (defun tar-pad-to-blocksize () |
1257 | "If we are being anal about tar file blocksizes, fix up the current buffer. | |
1258 | Leaves the region wide." | |
1259 | (if (null tar-anal-blocksize) | |
1260 | nil | |
1261 | (widen) | |
1262 | (let* ((last-desc (nth (1- (length tar-parse-info)) tar-parse-info)) | |
1263 | (start (tar-desc-data-start last-desc)) | |
1264 | (tokens (tar-desc-tokens last-desc)) | |
1265 | (link-p (tar-header-link-type tokens)) | |
1266 | (size (if link-p 0 (tar-header-size tokens))) | |
1267 | (data-end (+ start size)) | |
1268 | (bbytes (ash tar-anal-blocksize 9)) | |
8560523d | 1269 | (pad-to (+ bbytes (* bbytes (/ (- data-end (point-min)) bbytes)))) |
628d6cef | 1270 | (inhibit-read-only t) ; ## |
aa73f29c RS |
1271 | ) |
1272 | ;; If the padding after the last data is too long, delete some; | |
1273 | ;; else insert some until we are padded out to the right number of blocks. | |
1274 | ;; | |
8560523d SM |
1275 | (let ((goal-end (+ (or tar-header-offset 0) pad-to))) |
1276 | (if (> (point-max) goal-end) | |
1277 | (delete-region goal-end (point-max)) | |
1278 | (goto-char (point-max)) | |
1279 | (insert (make-string (- goal-end (point-max)) ?\0))))))) | |
aa73f29c RS |
1280 | |
1281 | ||
439fa06f | 1282 | ;; Used in write-file-hook to write tar-files out correctly. |
67501c01 RS |
1283 | (defun tar-mode-write-file () |
1284 | (unwind-protect | |
1285 | (save-excursion | |
1286 | (widen) | |
1287 | ;; Doing this here confuses things - the region gets left too wide! | |
1288 | ;; I suppose this is run in a context where changing the buffer is bad. | |
1289 | ;; (tar-pad-to-blocksize) | |
4063eb1c DL |
1290 | ;; tar-header-offset turns out to be null for files fetched with W3, |
1291 | ;; at least. | |
1b33e237 | 1292 | (let ((coding-system-for-write 'no-conversion)) |
e63f0ff0 GM |
1293 | (write-region (if tar-header-offset |
1294 | (byte-to-position tar-header-offset) | |
1295 | (point-min)) | |
1b33e237 KH |
1296 | (point-max) |
1297 | buffer-file-name nil t)) | |
87aed91b RS |
1298 | (tar-clear-modification-flags) |
1299 | (set-buffer-modified-p nil)) | |
643415c4 | 1300 | (narrow-to-region (point-min) (byte-to-position tar-header-offset))) |
23bdfc9a | 1301 | ;; Return t because we've written the file. |
67501c01 | 1302 | t) |
aa73f29c | 1303 | \f |
aa73f29c RS |
1304 | (provide 'tar-mode) |
1305 | ||
8560523d | 1306 | ;; arch-tag: 8a585a4a-340e-42c2-89e7-d3b1013a4b78 |
c88ab9ce | 1307 | ;;; tar-mode.el ends here |