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c88ab9ce | 1 | ;;; tar-mode.el --- simple editing of tar files from GNU emacs |
aa73f29c | 2 | |
b578f267 | 3 | ;; Copyright (C) 1990, 1991, 1993, 1994, 1995 Free Software Foundation, Inc. |
eea8d4ef | 4 | |
22a89ee8 | 5 | ;; Author: Jamie Zawinski <jwz@lucid.com> |
54138c9d | 6 | ;; Maintainer: FSF |
e5167999 | 7 | ;; Created: 04 Apr 1990 |
d7b4d18f | 8 | ;; Keywords: unix |
aa73f29c | 9 | |
b578f267 EN |
10 | ;; This file is part of GNU Emacs. |
11 | ||
12 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
13 | ;; it under the terms of the GNU General Public License as published by | |
14 | ;; the Free Software Foundation; either version 2, or (at your option) | |
15 | ;; any later version. | |
16 | ||
17 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
18 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | ;; GNU General Public License for more details. | |
21 | ||
22 | ;; You should have received a copy of the GNU General Public License | |
23 | ;; along with GNU Emacs; see the file COPYING. If not, write to the | |
24 | ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
25 | ;; Boston, MA 02111-1307, USA. | |
aa73f29c | 26 | |
22a89ee8 ER |
27 | ;;; Commentary: |
28 | ||
b578f267 EN |
29 | ;; This package attempts to make dealing with Unix 'tar' archives easier. |
30 | ;; When this code is loaded, visiting a file whose name ends in '.tar' will | |
31 | ;; cause the contents of that archive file to be displayed in a Dired-like | |
32 | ;; listing. It is then possible to use the customary Dired keybindings to | |
33 | ;; extract sub-files from that archive, either by reading them into their own | |
34 | ;; editor buffers, or by copying them directly to arbitrary files on disk. | |
35 | ;; It is also possible to delete sub-files from within the tar file and write | |
36 | ;; the modified archive back to disk, or to edit sub-files within the archive | |
37 | ;; and re-insert the modified files into the archive. See the documentation | |
38 | ;; string of tar-mode for more info. | |
39 | ||
40 | ;; This code now understands the extra fields that GNU tar adds to tar files. | |
41 | ||
42 | ;; This interacts correctly with "uncompress.el" in the Emacs library, | |
43 | ;; which you get with | |
44 | ;; | |
45 | ;; (autoload 'uncompress-while-visiting "uncompress") | |
46 | ;; (setq auto-mode-alist (cons '("\\.Z$" . uncompress-while-visiting) | |
47 | ;; auto-mode-alist)) | |
48 | ;; | |
49 | ;; Do not attempt to use tar-mode.el with crypt.el, you will lose. | |
50 | ||
51 | ;; *************** TO DO *************** | |
52 | ;; | |
53 | ;; o chmod should understand "a+x,og-w". | |
54 | ;; | |
55 | ;; o It's not possible to add a NEW file to a tar archive; not that | |
56 | ;; important, but still... | |
57 | ;; | |
58 | ;; o The code is less efficient that it could be - in a lot of places, I | |
59 | ;; pull a 512-character string out of the buffer and parse it, when I could | |
60 | ;; be parsing it in place, not garbaging a string. Should redo that. | |
61 | ;; | |
62 | ;; o I'd like a command that searches for a string/regexp in every subfile | |
63 | ;; of an archive, where <esc> would leave you in a subfile-edit buffer. | |
64 | ;; (Like the Meta-R command of the Zmacs mail reader.) | |
65 | ;; | |
66 | ;; o Sometimes (but not always) reverting the tar-file buffer does not | |
67 | ;; re-grind the listing, and you are staring at the binary tar data. | |
68 | ;; Typing 'g' again immediately after that will always revert and re-grind | |
69 | ;; it, though. I have no idea why this happens. | |
70 | ;; | |
71 | ;; o Tar-mode interacts poorly with crypt.el and zcat.el because the tar | |
72 | ;; write-file-hook actually writes the file. Instead it should remove the | |
73 | ;; header (and conspire to put it back afterwards) so that other write-file | |
74 | ;; hooks which frob the buffer have a chance to do their dirty work. There | |
75 | ;; might be a problem if the tar write-file-hook does not come *first* on | |
76 | ;; the list. | |
77 | ;; | |
78 | ;; o Block files, sparse files, continuation files, and the various header | |
79 | ;; types aren't editable. Actually I don't know that they work at all. | |
80 | ||
81 | ;; Rationale: | |
82 | ||
83 | ;; Why does tar-mode edit the file itself instead of using tar? | |
84 | ||
85 | ;; That means that you can edit tar files which you don't have room for | |
86 | ;; on your local disk. | |
87 | ||
88 | ;; I don't know about recent features in gnu tar, but old versions of tar | |
89 | ;; can't replace a file in the middle of a tar file with a new version. | |
90 | ;; Tar-mode can. I don't think tar can do things like chmod the subfiles. | |
91 | ;; An implementation which involved unpacking and repacking the file into | |
92 | ;; some scratch directory would be very wasteful, and wouldn't be able to | |
93 | ;; preserve the file owners. | |
ce210066 | 94 | |
22a89ee8 ER |
95 | ;;; Code: |
96 | ||
b4dd2e66 SE |
97 | (defgroup tar nil |
98 | "Simple editing of tar files." | |
99 | :prefix "tar-" | |
100 | :group 'data) | |
101 | ||
102 | (defcustom tar-anal-blocksize 20 | |
aa73f29c RS |
103 | "*The blocksize of tar files written by Emacs, or nil, meaning don't care. |
104 | The blocksize of a tar file is not really the size of the blocks; rather, it is | |
105 | the number of blocks written with one system call. When tarring to a tape, | |
106 | this is the size of the *tape* blocks, but when writing to a file, it doesn't | |
107 | matter much. The only noticeable difference is that if a tar file does not | |
108 | have a blocksize of 20, tar will tell you that; all this really controls is | |
b4dd2e66 SE |
109 | how many null padding bytes go on the end of the tar file." |
110 | :type '(choice integer (const nil)) | |
111 | :group 'tar) | |
aa73f29c | 112 | |
b4dd2e66 | 113 | (defcustom tar-update-datestamp nil |
678b159e | 114 | "*Non-nil means Tar mode should play fast and loose with sub-file datestamps. |
30712209 | 115 | If this is true, then editing and saving a tar file entry back into its |
aa73f29c RS |
116 | tar file will update its datestamp. If false, the datestamp is unchanged. |
117 | You may or may not want this - it is good in that you can tell when a file | |
118 | in a tar archive has been changed, but it is bad for the same reason that | |
119 | editing a file in the tar archive at all is bad - the changed version of | |
b4dd2e66 SE |
120 | the file never exists on disk." |
121 | :type 'boolean | |
122 | :group 'tar) | |
aa73f29c | 123 | |
b4dd2e66 | 124 | (defcustom tar-mode-show-date nil |
30712209 | 125 | "*Non-nil means Tar mode should show the date/time of each subfile. |
b4dd2e66 SE |
126 | This information is useful, but it takes screen space away from file names." |
127 | :type 'boolean | |
128 | :group 'tar) | |
30712209 | 129 | |
0f8becaa | 130 | (defvar tar-parse-info nil) |
1b33e237 | 131 | ;; Be sure that this variable holds byte position, not char position. |
0f8becaa ER |
132 | (defvar tar-header-offset nil) |
133 | (defvar tar-superior-buffer nil) | |
134 | (defvar tar-superior-descriptor nil) | |
135 | (defvar tar-subfile-mode nil) | |
1c0b3743 RS |
136 | |
137 | (put 'tar-parse-info 'permanent-local t) | |
138 | (put 'tar-header-offset 'permanent-local t) | |
139 | (put 'tar-superior-buffer 'permanent-local t) | |
140 | (put 'tar-superior-descriptor 'permanent-local t) | |
aa73f29c RS |
141 | \f |
142 | ;;; First, duplicate some Common Lisp functions; I used to just (require 'cl) | |
143 | ;;; but "cl.el" was messing some people up (also it's really big). | |
144 | ||
145 | (defmacro tar-setf (form val) | |
146 | "A mind-numbingly simple implementation of setf." | |
147 | (let ((mform (macroexpand form (and (boundp 'byte-compile-macro-environment) | |
148 | byte-compile-macro-environment)))) | |
149 | (cond ((symbolp mform) (list 'setq mform val)) | |
150 | ((not (consp mform)) (error "can't setf %s" form)) | |
151 | ((eq (car mform) 'aref) | |
152 | (list 'aset (nth 1 mform) (nth 2 mform) val)) | |
153 | ((eq (car mform) 'car) | |
154 | (list 'setcar (nth 1 mform) val)) | |
155 | ((eq (car mform) 'cdr) | |
156 | (list 'setcdr (nth 1 mform) val)) | |
157 | (t (error "don't know how to setf %s" form))))) | |
158 | ||
159 | (defmacro tar-dolist (control &rest body) | |
160 | "syntax: (dolist (var-name list-expr &optional return-value) &body body)" | |
161 | (let ((var (car control)) | |
162 | (init (car (cdr control))) | |
163 | (val (car (cdr (cdr control))))) | |
164 | (list 'let (list (list '_dolist_iterator_ init)) | |
165 | (list 'while '_dolist_iterator_ | |
166 | (cons 'let | |
167 | (cons (list (list var '(car _dolist_iterator_))) | |
168 | (append body | |
169 | (list (list 'setq '_dolist_iterator_ | |
170 | (list 'cdr '_dolist_iterator_))))))) | |
171 | val))) | |
172 | ||
173 | (defmacro tar-dotimes (control &rest body) | |
174 | "syntax: (dolist (var-name count-expr &optional return-value) &body body)" | |
175 | (let ((var (car control)) | |
176 | (n (car (cdr control))) | |
177 | (val (car (cdr (cdr control))))) | |
178 | (list 'let (list (list '_dotimes_end_ n) | |
179 | (list var 0)) | |
180 | (cons 'while | |
181 | (cons (list '< var '_dotimes_end_) | |
182 | (append body | |
183 | (list (list 'setq var (list '1+ var)))))) | |
184 | val))) | |
185 | ||
186 | \f | |
187 | ;;; down to business. | |
188 | ||
189 | (defmacro make-tar-header (name mode uid git size date ck lt ln | |
190 | magic uname gname devmaj devmin) | |
191 | (list 'vector name mode uid git size date ck lt ln | |
192 | magic uname gname devmaj devmin)) | |
193 | ||
194 | (defmacro tar-header-name (x) (list 'aref x 0)) | |
195 | (defmacro tar-header-mode (x) (list 'aref x 1)) | |
196 | (defmacro tar-header-uid (x) (list 'aref x 2)) | |
197 | (defmacro tar-header-gid (x) (list 'aref x 3)) | |
198 | (defmacro tar-header-size (x) (list 'aref x 4)) | |
199 | (defmacro tar-header-date (x) (list 'aref x 5)) | |
200 | (defmacro tar-header-checksum (x) (list 'aref x 6)) | |
201 | (defmacro tar-header-link-type (x) (list 'aref x 7)) | |
202 | (defmacro tar-header-link-name (x) (list 'aref x 8)) | |
203 | (defmacro tar-header-magic (x) (list 'aref x 9)) | |
204 | (defmacro tar-header-uname (x) (list 'aref x 10)) | |
205 | (defmacro tar-header-gname (x) (list 'aref x 11)) | |
206 | (defmacro tar-header-dmaj (x) (list 'aref x 12)) | |
207 | (defmacro tar-header-dmin (x) (list 'aref x 13)) | |
208 | ||
209 | (defmacro make-tar-desc (data-start tokens) | |
210 | (list 'cons data-start tokens)) | |
211 | ||
212 | (defmacro tar-desc-data-start (x) (list 'car x)) | |
213 | (defmacro tar-desc-tokens (x) (list 'cdr x)) | |
214 | ||
215 | (defconst tar-name-offset 0) | |
216 | (defconst tar-mode-offset (+ tar-name-offset 100)) | |
217 | (defconst tar-uid-offset (+ tar-mode-offset 8)) | |
218 | (defconst tar-gid-offset (+ tar-uid-offset 8)) | |
219 | (defconst tar-size-offset (+ tar-gid-offset 8)) | |
220 | (defconst tar-time-offset (+ tar-size-offset 12)) | |
221 | (defconst tar-chk-offset (+ tar-time-offset 12)) | |
222 | (defconst tar-linkp-offset (+ tar-chk-offset 8)) | |
223 | (defconst tar-link-offset (+ tar-linkp-offset 1)) | |
224 | ;;; GNU-tar specific slots. | |
225 | (defconst tar-magic-offset (+ tar-link-offset 100)) | |
226 | (defconst tar-uname-offset (+ tar-magic-offset 8)) | |
227 | (defconst tar-gname-offset (+ tar-uname-offset 32)) | |
228 | (defconst tar-dmaj-offset (+ tar-gname-offset 32)) | |
229 | (defconst tar-dmin-offset (+ tar-dmaj-offset 8)) | |
230 | (defconst tar-end-offset (+ tar-dmin-offset 8)) | |
231 | ||
1bc28099 | 232 | (defun tar-header-block-tokenize (string) |
e865c5ce RS |
233 | "Return a `tar-header' structure. |
234 | This is a list of name, mode, uid, gid, size, | |
235 | write-date, checksum, link-type, and link-name." | |
aa73f29c RS |
236 | (cond ((< (length string) 512) nil) |
237 | (;(some 'plusp string) ; <-- oops, massive cycle hog! | |
238 | (or (not (= 0 (aref string 0))) ; This will do. | |
239 | (not (= 0 (aref string 101)))) | |
240 | (let* ((name-end (1- tar-mode-offset)) | |
241 | (link-end (1- tar-magic-offset)) | |
242 | (uname-end (1- tar-gname-offset)) | |
243 | (gname-end (1- tar-dmaj-offset)) | |
244 | (link-p (aref string tar-linkp-offset)) | |
245 | (magic-str (substring string tar-magic-offset (1- tar-uname-offset))) | |
246 | (uname-valid-p (or (string= "ustar " magic-str) (string= "GNUtar " magic-str))) | |
247 | name | |
248 | (nulsexp "[^\000]*\000")) | |
249 | (and (string-match nulsexp string tar-name-offset) (setq name-end (min name-end (1- (match-end 0))))) | |
250 | (and (string-match nulsexp string tar-link-offset) (setq link-end (min link-end (1- (match-end 0))))) | |
251 | (and (string-match nulsexp string tar-uname-offset) (setq uname-end (min uname-end (1- (match-end 0))))) | |
252 | (and (string-match nulsexp string tar-gname-offset) (setq gname-end (min gname-end (1- (match-end 0))))) | |
253 | (setq name (substring string tar-name-offset name-end) | |
254 | link-p (if (or (= link-p 0) (= link-p ?0)) | |
255 | nil | |
256 | (- link-p ?0))) | |
1b33e237 KH |
257 | (setq linkname (substring string tar-link-offset link-end)) |
258 | (if default-enable-multibyte-characters | |
259 | (setq name | |
260 | (decode-coding-string name (or file-name-coding-system | |
261 | 'undecided)) | |
262 | linkname | |
263 | (decode-coding-string linkname (or file-name-coding-system | |
264 | 'undecided)))) | |
aa73f29c RS |
265 | (if (and (null link-p) (string-match "/$" name)) (setq link-p 5)) ; directory |
266 | (make-tar-header | |
267 | name | |
268 | (tar-parse-octal-integer string tar-mode-offset (1- tar-uid-offset)) | |
269 | (tar-parse-octal-integer string tar-uid-offset (1- tar-gid-offset)) | |
270 | (tar-parse-octal-integer string tar-gid-offset (1- tar-size-offset)) | |
271 | (tar-parse-octal-integer string tar-size-offset (1- tar-time-offset)) | |
30712209 | 272 | (tar-parse-octal-long-integer string tar-time-offset (1- tar-chk-offset)) |
aa73f29c RS |
273 | (tar-parse-octal-integer string tar-chk-offset (1- tar-linkp-offset)) |
274 | link-p | |
1b33e237 | 275 | linkname |
aa73f29c RS |
276 | uname-valid-p |
277 | (and uname-valid-p (substring string tar-uname-offset uname-end)) | |
278 | (and uname-valid-p (substring string tar-gname-offset gname-end)) | |
279 | (tar-parse-octal-integer string tar-dmaj-offset (1- tar-dmin-offset)) | |
280 | (tar-parse-octal-integer string tar-dmin-offset (1- tar-end-offset)) | |
281 | ))) | |
282 | (t 'empty-tar-block))) | |
283 | ||
284 | ||
285 | (defun tar-parse-octal-integer (string &optional start end) | |
aa73f29c RS |
286 | (if (null start) (setq start 0)) |
287 | (if (null end) (setq end (length string))) | |
288 | (if (= (aref string start) 0) | |
289 | 0 | |
290 | (let ((n 0)) | |
291 | (while (< start end) | |
292 | (setq n (if (< (aref string start) ?0) n | |
30712209 | 293 | (+ (* n 8) (- (aref string start) ?0))) |
aa73f29c RS |
294 | start (1+ start))) |
295 | n))) | |
296 | ||
30712209 RS |
297 | (defun tar-parse-octal-long-integer (string &optional start end) |
298 | (if (null start) (setq start 0)) | |
299 | (if (null end) (setq end (length string))) | |
300 | (if (= (aref string start) 0) | |
806cba9c | 301 | (list 0 0) |
30712209 RS |
302 | (let ((lo 0) |
303 | (hi 0)) | |
304 | (while (< start end) | |
305 | (if (>= (aref string start) ?0) | |
306 | (setq lo (+ (* lo 8) (- (aref string start) ?0)) | |
307 | hi (+ (* hi 8) (ash lo -16)) | |
308 | lo (logand lo 65535))) | |
309 | (setq start (1+ start))) | |
310 | (list hi lo)))) | |
311 | ||
aa73f29c RS |
312 | (defun tar-parse-octal-integer-safe (string) |
313 | (let ((L (length string))) | |
314 | (if (= L 0) (error "empty string")) | |
315 | (tar-dotimes (i L) | |
316 | (if (or (< (aref string i) ?0) | |
317 | (> (aref string i) ?7)) | |
678b159e | 318 | (error "`%c' is not an octal digit")))) |
aa73f29c RS |
319 | (tar-parse-octal-integer string)) |
320 | ||
321 | ||
1bc28099 | 322 | (defun tar-header-block-checksum (string) |
e865c5ce | 323 | "Compute and return a tar-acceptable checksum for this block." |
aa73f29c RS |
324 | (let* ((chk-field-start tar-chk-offset) |
325 | (chk-field-end (+ chk-field-start 8)) | |
326 | (sum 0) | |
327 | (i 0)) | |
328 | ;; Add up all of the characters except the ones in the checksum field. | |
329 | ;; Add that field as if it were filled with spaces. | |
330 | (while (< i chk-field-start) | |
331 | (setq sum (+ sum (aref string i)) | |
332 | i (1+ i))) | |
333 | (setq i chk-field-end) | |
334 | (while (< i 512) | |
335 | (setq sum (+ sum (aref string i)) | |
336 | i (1+ i))) | |
337 | (+ sum (* 32 8)))) | |
338 | ||
1bc28099 | 339 | (defun tar-header-block-check-checksum (hblock desired-checksum file-name) |
aa73f29c | 340 | "Beep and print a warning if the checksum doesn't match." |
1bc28099 | 341 | (if (not (= desired-checksum (tar-header-block-checksum hblock))) |
aa73f29c RS |
342 | (progn (beep) (message "Invalid checksum for file %s!" file-name)))) |
343 | ||
1bc28099 | 344 | (defun tar-header-block-recompute-checksum (hblock) |
aa73f29c | 345 | "Modifies the given string to have a valid checksum field." |
1bc28099 | 346 | (let* ((chk (tar-header-block-checksum hblock)) |
aa73f29c RS |
347 | (chk-string (format "%6o" chk)) |
348 | (l (length chk-string))) | |
349 | (aset hblock 154 0) | |
350 | (aset hblock 155 32) | |
351 | (tar-dotimes (i l) (aset hblock (- 153 i) (aref chk-string (- l i 1))))) | |
352 | hblock) | |
353 | ||
30712209 RS |
354 | (defun tar-clip-time-string (time) |
355 | (let ((str (current-time-string time))) | |
356 | (concat (substring str 4 16) (substring str 19 24)))) | |
aa73f29c RS |
357 | |
358 | (defun tar-grind-file-mode (mode string start) | |
6a06ace6 RS |
359 | "Store `-rw--r--r--' indicating MODE into STRING beginning at START. |
360 | MODE should be an integer which is a file mode value." | |
aa73f29c RS |
361 | (aset string start (if (zerop (logand 256 mode)) ?- ?r)) |
362 | (aset string (+ start 1) (if (zerop (logand 128 mode)) ?- ?w)) | |
363 | (aset string (+ start 2) (if (zerop (logand 64 mode)) ?- ?x)) | |
364 | (aset string (+ start 3) (if (zerop (logand 32 mode)) ?- ?r)) | |
365 | (aset string (+ start 4) (if (zerop (logand 16 mode)) ?- ?w)) | |
366 | (aset string (+ start 5) (if (zerop (logand 8 mode)) ?- ?x)) | |
367 | (aset string (+ start 6) (if (zerop (logand 4 mode)) ?- ?r)) | |
368 | (aset string (+ start 7) (if (zerop (logand 2 mode)) ?- ?w)) | |
369 | (aset string (+ start 8) (if (zerop (logand 1 mode)) ?- ?x)) | |
370 | (if (zerop (logand 1024 mode)) nil (aset string (+ start 2) ?s)) | |
371 | (if (zerop (logand 2048 mode)) nil (aset string (+ start 5) ?s)) | |
372 | string) | |
373 | ||
1bc28099 | 374 | (defun tar-header-block-summarize (tar-hblock &optional mod-p) |
e865c5ce | 375 | "Returns a line similar to the output of `tar -vtf'." |
aa73f29c RS |
376 | (let ((name (tar-header-name tar-hblock)) |
377 | (mode (tar-header-mode tar-hblock)) | |
378 | (uid (tar-header-uid tar-hblock)) | |
379 | (gid (tar-header-gid tar-hblock)) | |
380 | (uname (tar-header-uname tar-hblock)) | |
381 | (gname (tar-header-gname tar-hblock)) | |
382 | (size (tar-header-size tar-hblock)) | |
383 | (time (tar-header-date tar-hblock)) | |
384 | (ck (tar-header-checksum tar-hblock)) | |
385 | (link-p (tar-header-link-type tar-hblock)) | |
386 | (link-name (tar-header-link-name tar-hblock)) | |
387 | ) | |
388 | (let* ((left 11) | |
389 | (namew 8) | |
390 | (groupw 8) | |
391 | (sizew 8) | |
30712209 | 392 | (datew (if tar-mode-show-date 18 0)) |
aa73f29c RS |
393 | (slash (1- (+ left namew))) |
394 | (lastdigit (+ slash groupw sizew)) | |
30712209 RS |
395 | (datestart (+ lastdigit 2)) |
396 | (namestart (+ datestart datew)) | |
1b33e237 KH |
397 | (multibyte (or (multibyte-string-p name) |
398 | (multibyte-string-p link-name))) | |
399 | ;; If multibyte, we can't use optimized method of aset, | |
400 | ;; instead we must use concat. | |
401 | (string (make-string (if multibyte | |
402 | namestart | |
403 | (+ namestart | |
404 | (length name) | |
405 | (if link-p (+ 5 (length link-name)) 0))) | |
406 | 32)) | |
aa73f29c RS |
407 | (type (tar-header-link-type tar-hblock))) |
408 | (aset string 0 (if mod-p ?* ? )) | |
409 | (aset string 1 | |
410 | (cond ((or (eq type nil) (eq type 0)) ?-) | |
411 | ((eq type 1) ?l) ; link | |
412 | ((eq type 2) ?s) ; symlink | |
413 | ((eq type 3) ?c) ; char special | |
414 | ((eq type 4) ?b) ; block special | |
415 | ((eq type 5) ?d) ; directory | |
416 | ((eq type 6) ?p) ; FIFO/pipe | |
417 | ((eq type 20) ?*) ; directory listing | |
418 | ((eq type 29) ?M) ; multivolume continuation | |
419 | ((eq type 35) ?S) ; sparse | |
420 | ((eq type 38) ?V) ; volume header | |
421 | )) | |
422 | (tar-grind-file-mode mode string 2) | |
423 | (setq uid (if (= 0 (length uname)) (int-to-string uid) uname)) | |
424 | (setq gid (if (= 0 (length gname)) (int-to-string gid) gname)) | |
425 | (setq size (int-to-string size)) | |
30712209 | 426 | (setq time (tar-clip-time-string time)) |
aa73f29c RS |
427 | (tar-dotimes (i (min (1- namew) (length uid))) (aset string (- slash i) (aref uid (- (length uid) i 1)))) |
428 | (aset string (1+ slash) ?/) | |
429 | (tar-dotimes (i (min (1- groupw) (length gid))) (aset string (+ (+ slash 2) i) (aref gid i))) | |
430 | (tar-dotimes (i (min sizew (length size))) (aset string (- lastdigit i) (aref size (- (length size) i 1)))) | |
30712209 RS |
431 | (if tar-mode-show-date |
432 | (tar-dotimes (i (length time)) (aset string (+ datestart i) (aref time i)))) | |
1b33e237 KH |
433 | (if multibyte |
434 | (setq string (concat string name)) | |
435 | (tar-dotimes (i (length name)) (aset string (+ namestart i) (aref name i)))) | |
aa73f29c | 436 | (if (or (eq link-p 1) (eq link-p 2)) |
1b33e237 KH |
437 | (if multibyte |
438 | (setq string (concat string | |
439 | (if (= link-p 1) " ==> " " --> ") | |
440 | link-name)) | |
aa73f29c RS |
441 | (tar-dotimes (i 3) (aset string (+ namestart 1 (length name) i) (aref (if (= link-p 1) "==>" "-->") i))) |
442 | (tar-dotimes (i (length link-name)) (aset string (+ namestart 5 (length name) i) (aref link-name i))))) | |
84258c5d KH |
443 | (put-text-property namestart (length string) |
444 | 'mouse-face 'highlight string) | |
aa73f29c RS |
445 | string))) |
446 | ||
447 | ||
448 | (defun tar-summarize-buffer () | |
e865c5ce RS |
449 | "Parse the contents of the tar file in the current buffer. |
450 | Place a dired-like listing on the front; | |
451 | then narrow to it, so that only that listing | |
aa73f29c | 452 | is visible (and the real data of the buffer is hidden)." |
1b33e237 | 453 | (set-buffer-multibyte nil) |
67501c01 | 454 | (message "Parsing tar file...") |
aa73f29c RS |
455 | (let* ((result '()) |
456 | (pos 1) | |
457 | (bs (max 1 (- (buffer-size) 1024))) ; always 2+ empty blocks at end. | |
458 | (bs100 (max 1 (/ bs 100))) | |
7bfcceab KH |
459 | tokens) |
460 | (while (and (<= (+ pos 512) (point-max)) | |
461 | (not (eq 'empty-tar-block | |
462 | (setq tokens | |
463 | (tar-header-block-tokenize | |
464 | (buffer-substring pos (+ pos 512))))))) | |
1b15043e | 465 | (setq pos (+ pos 512)) |
7bfcceab | 466 | (message "Parsing tar file...%d%%" |
1b15043e KH |
467 | ;(/ (* pos 100) bs) ; this gets round-off lossage |
468 | (/ pos bs100) ; this doesn't | |
469 | ) | |
7bfcceab KH |
470 | (if (eq (tar-header-link-type tokens) 20) |
471 | ;; Foo. There's an extra empty block after these. | |
472 | (setq pos (+ pos 512))) | |
473 | (let ((size (tar-header-size tokens))) | |
474 | (if (< size 0) | |
475 | (error "%s has size %s - corrupted" | |
476 | (tar-header-name tokens) size)) | |
477 | ; | |
478 | ; This is just too slow. Don't really need it anyway.... | |
479 | ;(tar-header-block-check-checksum | |
480 | ; hblock (tar-header-block-checksum hblock) | |
481 | ; (tar-header-name tokens)) | |
482 | ||
483 | (setq result (cons (make-tar-desc pos tokens) result)) | |
484 | ||
485 | (and (null (tar-header-link-type tokens)) | |
486 | (> size 0) | |
487 | (setq pos | |
488 | (+ pos 512 (ash (ash (1- size) -9) 9)) ; this works | |
489 | ;(+ pos (+ size (- 512 (rem (1- size) 512)))) ; this doesn't | |
490 | )))) | |
aa73f29c | 491 | (make-local-variable 'tar-parse-info) |
7bfcceab KH |
492 | (setq tar-parse-info (nreverse result)) |
493 | ;; A tar file should end with a block or two of nulls, | |
494 | ;; but let's not get a fatal error if it doesn't. | |
495 | (if (eq tokens 'empty-tar-block) | |
624204f0 | 496 | (message "Parsing tar file...done") |
7bfcceab | 497 | (message "Warning: premature EOF parsing tar file"))) |
aa73f29c RS |
498 | (save-excursion |
499 | (goto-char (point-min)) | |
a728aa90 RS |
500 | (let ((buffer-read-only nil) |
501 | (summaries nil)) | |
502 | ;; Collect summary lines and insert them all at once since tar files | |
503 | ;; can be pretty big. | |
624204f0 | 504 | (tar-dolist (tar-desc (reverse tar-parse-info)) |
a728aa90 RS |
505 | (setq summaries |
506 | (cons (tar-header-block-summarize (tar-desc-tokens tar-desc)) | |
507 | (cons "\n" | |
508 | summaries)))) | |
1b33e237 KH |
509 | (let ((total-summaries (apply 'concat summaries))) |
510 | (if (multibyte-string-p total-summaries) | |
511 | (set-buffer-multibyte t)) | |
512 | (insert total-summaries)) | |
aa73f29c RS |
513 | (make-local-variable 'tar-header-offset) |
514 | (setq tar-header-offset (point)) | |
515 | (narrow-to-region 1 tar-header-offset) | |
1b33e237 KH |
516 | (if enable-multibyte-characters |
517 | (setq tar-header-offset (position-bytes tar-header-offset))) | |
7bfcceab | 518 | (set-buffer-modified-p nil)))) |
e865c5ce | 519 | \f |
439fa06f | 520 | (defvar tar-mode-map nil "*Local keymap for Tar mode listings.") |
aa73f29c RS |
521 | |
522 | (if tar-mode-map | |
523 | nil | |
524 | (setq tar-mode-map (make-keymap)) | |
525 | (suppress-keymap tar-mode-map) | |
526 | (define-key tar-mode-map " " 'tar-next-line) | |
92062a09 | 527 | (define-key tar-mode-map "C" 'tar-copy) |
aa73f29c RS |
528 | (define-key tar-mode-map "d" 'tar-flag-deleted) |
529 | (define-key tar-mode-map "\^D" 'tar-flag-deleted) | |
530 | (define-key tar-mode-map "e" 'tar-extract) | |
531 | (define-key tar-mode-map "f" 'tar-extract) | |
42269da5 | 532 | (define-key tar-mode-map "\C-m" 'tar-extract) |
439fa06f | 533 | (define-key tar-mode-map [mouse-2] 'tar-mouse-extract) |
aa73f29c RS |
534 | (define-key tar-mode-map "g" 'revert-buffer) |
535 | (define-key tar-mode-map "h" 'describe-mode) | |
536 | (define-key tar-mode-map "n" 'tar-next-line) | |
537 | (define-key tar-mode-map "\^N" 'tar-next-line) | |
b6445135 | 538 | (define-key tar-mode-map [down] 'tar-next-line) |
aa73f29c | 539 | (define-key tar-mode-map "o" 'tar-extract-other-window) |
aa73f29c | 540 | (define-key tar-mode-map "p" 'tar-previous-line) |
92062a09 | 541 | (define-key tar-mode-map "q" 'tar-quit) |
aa73f29c | 542 | (define-key tar-mode-map "\^P" 'tar-previous-line) |
b6445135 | 543 | (define-key tar-mode-map [up] 'tar-previous-line) |
92062a09 | 544 | (define-key tar-mode-map "R" 'tar-rename-entry) |
aa73f29c RS |
545 | (define-key tar-mode-map "u" 'tar-unflag) |
546 | (define-key tar-mode-map "v" 'tar-view) | |
547 | (define-key tar-mode-map "x" 'tar-expunge) | |
548 | (define-key tar-mode-map "\177" 'tar-unflag-backwards) | |
549 | (define-key tar-mode-map "E" 'tar-extract-other-window) | |
550 | (define-key tar-mode-map "M" 'tar-chmod-entry) | |
551 | (define-key tar-mode-map "G" 'tar-chgrp-entry) | |
552 | (define-key tar-mode-map "O" 'tar-chown-entry) | |
553 | ) | |
e865c5ce RS |
554 | \f |
555 | ;; Make menu bar items. | |
556 | ||
557 | ;; Get rid of the Edit menu bar item to save space. | |
558 | (define-key tar-mode-map [menu-bar edit] 'undefined) | |
559 | ||
560 | (define-key tar-mode-map [menu-bar immediate] | |
561 | (cons "Immediate" (make-sparse-keymap "Immediate"))) | |
562 | ||
563 | (define-key tar-mode-map [menu-bar immediate view] | |
564 | '("View This File" . tar-view)) | |
565 | (define-key tar-mode-map [menu-bar immediate display] | |
ddcb4671 | 566 | '("Display in Other Window" . tar-display-other-window)) |
e865c5ce RS |
567 | (define-key tar-mode-map [menu-bar immediate find-file-other-window] |
568 | '("Find in Other Window" . tar-extract-other-window)) | |
569 | (define-key tar-mode-map [menu-bar immediate find-file] | |
570 | '("Find This File" . tar-extract)) | |
571 | ||
572 | (define-key tar-mode-map [menu-bar mark] | |
573 | (cons "Mark" (make-sparse-keymap "Mark"))) | |
574 | ||
575 | (define-key tar-mode-map [menu-bar mark unmark-all] | |
576 | '("Unmark All" . tar-clear-modification-flags)) | |
577 | (define-key tar-mode-map [menu-bar mark deletion] | |
578 | '("Flag" . tar-flag-deleted)) | |
579 | (define-key tar-mode-map [menu-bar mark unmark] | |
580 | '("Unflag" . tar-unflag)) | |
581 | ||
582 | (define-key tar-mode-map [menu-bar operate] | |
583 | (cons "Operate" (make-sparse-keymap "Operate"))) | |
584 | ||
585 | (define-key tar-mode-map [menu-bar operate chown] | |
586 | '("Change Owner..." . tar-chown-entry)) | |
587 | (define-key tar-mode-map [menu-bar operate chgrp] | |
588 | '("Change Group..." . tar-chgrp-entry)) | |
589 | (define-key tar-mode-map [menu-bar operate chmod] | |
590 | '("Change Mode..." . tar-chmod-entry)) | |
591 | (define-key tar-mode-map [menu-bar operate rename] | |
592 | '("Rename to..." . tar-rename-entry)) | |
593 | (define-key tar-mode-map [menu-bar operate copy] | |
594 | '("Copy to..." . tar-copy)) | |
595 | (define-key tar-mode-map [menu-bar operate expunge] | |
9f1250c5 | 596 | '("Expunge Marked Files" . tar-expunge)) |
e865c5ce | 597 | \f |
aa73f29c RS |
598 | ;; tar mode is suitable only for specially formatted data. |
599 | (put 'tar-mode 'mode-class 'special) | |
600 | (put 'tar-subfile-mode 'mode-class 'special) | |
601 | ||
bdd53bbc | 602 | ;;;###autoload |
aa73f29c RS |
603 | (defun tar-mode () |
604 | "Major mode for viewing a tar file as a dired-like listing of its contents. | |
605 | You can move around using the usual cursor motion commands. | |
606 | Letters no longer insert themselves. | |
439fa06f RS |
607 | Type `e' to pull a file out of the tar file and into its own buffer; |
608 | or click mouse-2 on the file's line in the Tar mode buffer. | |
e865c5ce | 609 | Type `c' to copy an entry from the tar file into another file on disk. |
aa73f29c | 610 | |
e865c5ce RS |
611 | If you edit a sub-file of this archive (as with the `e' command) and |
612 | save it with Control-x Control-s, the contents of that buffer will be | |
aa73f29c RS |
613 | saved back into the tar-file buffer; in this way you can edit a file |
614 | inside of a tar archive without extracting it and re-archiving it. | |
615 | ||
e865c5ce | 616 | See also: variables `tar-update-datestamp' and `tar-anal-blocksize'. |
aa73f29c RS |
617 | \\{tar-mode-map}" |
618 | ;; this is not interactive because you shouldn't be turning this | |
619 | ;; mode on and off. You can corrupt things that way. | |
1c0b3743 RS |
620 | ;; rms: with permanent locals, it should now be possible to make this work |
621 | ;; interactively in some reasonable fashion. | |
622 | (kill-all-local-variables) | |
aa73f29c RS |
623 | (make-local-variable 'tar-header-offset) |
624 | (make-local-variable 'tar-parse-info) | |
625 | (make-local-variable 'require-final-newline) | |
626 | (setq require-final-newline nil) ; binary data, dude... | |
627 | (make-local-variable 'revert-buffer-function) | |
628 | (setq revert-buffer-function 'tar-mode-revert) | |
678b159e RS |
629 | (make-local-variable 'local-enable-local-variables) |
630 | (setq local-enable-local-variables nil) | |
67501c01 RS |
631 | (make-local-variable 'next-line-add-newlines) |
632 | (setq next-line-add-newlines nil) | |
b9ca3cdb RS |
633 | ;; Prevent loss of data when saving the file. |
634 | (make-local-variable 'file-precious-flag) | |
635 | (setq file-precious-flag t) | |
aa73f29c RS |
636 | (setq major-mode 'tar-mode) |
637 | (setq mode-name "Tar") | |
638 | (use-local-map tar-mode-map) | |
639 | (auto-save-mode 0) | |
9a0341b2 KH |
640 | (make-local-variable 'write-contents-hooks) |
641 | (setq write-contents-hooks '(tar-mode-write-file)) | |
aa73f29c RS |
642 | (widen) |
643 | (if (and (boundp 'tar-header-offset) tar-header-offset) | |
1b33e237 | 644 | (narrow-to-region 1 (byte-to-position tar-header-offset)) |
47414bc1 RS |
645 | (tar-summarize-buffer) |
646 | (tar-next-line 0)) | |
aa73f29c RS |
647 | (run-hooks 'tar-mode-hook) |
648 | ) | |
649 | ||
650 | ||
651 | (defun tar-subfile-mode (p) | |
652 | "Minor mode for editing an element of a tar-file. | |
76605277 RS |
653 | This mode arranges for \"saving\" this buffer to write the data |
654 | into the tar-file buffer that it came from. The changes will actually | |
655 | appear on disk when you save the tar-file's buffer." | |
aa73f29c | 656 | (interactive "P") |
0f8becaa | 657 | (or (and (boundp 'tar-superior-buffer) tar-superior-buffer) |
e865c5ce | 658 | (error "This buffer is not an element of a tar file")) |
c09655bc RS |
659 | ;;; Don't do this, because it is redundant and wastes mode line space. |
660 | ;;; (or (assq 'tar-subfile-mode minor-mode-alist) | |
661 | ;;; (setq minor-mode-alist (append minor-mode-alist | |
662 | ;;; (list '(tar-subfile-mode " TarFile"))))) | |
aa73f29c RS |
663 | (make-local-variable 'tar-subfile-mode) |
664 | (setq tar-subfile-mode | |
665 | (if (null p) | |
666 | (not tar-subfile-mode) | |
667 | (> (prefix-numeric-value p) 0))) | |
668 | (cond (tar-subfile-mode | |
e865c5ce RS |
669 | (make-local-variable 'local-write-file-hooks) |
670 | (setq local-write-file-hooks '(tar-subfile-save-buffer)) | |
aa73f29c | 671 | ;; turn off auto-save. |
75238436 | 672 | (auto-save-mode -1) |
aa73f29c RS |
673 | (setq buffer-auto-save-file-name nil) |
674 | (run-hooks 'tar-subfile-mode-hook)) | |
e865c5ce RS |
675 | (t |
676 | (kill-local-variable 'local-write-file-hooks)))) | |
aa73f29c RS |
677 | |
678 | ||
e865c5ce | 679 | ;; Revert the buffer and recompute the dired-like listing. |
f6b0805a | 680 | (defun tar-mode-revert (&optional no-auto-save no-confirm) |
3742f39f RS |
681 | (let ((revert-buffer-function nil) |
682 | (old-offset tar-header-offset) | |
683 | success) | |
684 | (setq tar-header-offset nil) | |
685 | (unwind-protect | |
686 | (and (revert-buffer t no-confirm) | |
687 | (progn (widen) | |
688 | (setq success t) | |
689 | (tar-mode))) | |
690 | ;; If the revert was canceled, | |
691 | ;; put back the old value of tar-header-offset. | |
692 | (or success | |
693 | (setq tar-header-offset old-offset))))) | |
aa73f29c RS |
694 | |
695 | ||
696 | (defun tar-next-line (p) | |
697 | (interactive "p") | |
698 | (forward-line p) | |
30712209 | 699 | (if (eobp) nil (forward-char (if tar-mode-show-date 54 36)))) |
aa73f29c RS |
700 | |
701 | (defun tar-previous-line (p) | |
702 | (interactive "p") | |
703 | (tar-next-line (- p))) | |
704 | ||
705 | (defun tar-current-descriptor (&optional noerror) | |
e865c5ce | 706 | "Return the tar-descriptor of the current line, or signals an error." |
aa73f29c RS |
707 | ;; I wish lines had plists, like in ZMACS... |
708 | (or (nth (count-lines (point-min) | |
709 | (save-excursion (beginning-of-line) (point))) | |
710 | tar-parse-info) | |
711 | (if noerror | |
712 | nil | |
439fa06f | 713 | (error "This line does not describe a tar-file entry")))) |
aa73f29c | 714 | |
439fa06f RS |
715 | (defun tar-get-descriptor () |
716 | (let* ((descriptor (tar-current-descriptor)) | |
717 | (tokens (tar-desc-tokens descriptor)) | |
718 | (size (tar-header-size tokens)) | |
719 | (link-p (tar-header-link-type tokens))) | |
720 | (if link-p | |
721 | (error "This is a %s, not a real file" | |
722 | (cond ((eq link-p 5) "directory") | |
723 | ((eq link-p 20) "tar directory header") | |
724 | ((eq link-p 29) "multivolume-continuation") | |
725 | ((eq link-p 35) "sparse entry") | |
726 | ((eq link-p 38) "volume header") | |
727 | (t "link")))) | |
728 | (if (zerop size) (error "This is a zero-length file")) | |
729 | descriptor)) | |
730 | ||
731 | (defun tar-mouse-extract (event) | |
732 | "Extract a file whose tar directory line you click on." | |
733 | (interactive "e") | |
734 | (save-excursion | |
735 | (set-buffer (window-buffer (posn-window (event-end event)))) | |
736 | (save-excursion | |
737 | (goto-char (posn-point (event-end event))) | |
738 | ;; Just make sure this doesn't get an error. | |
739 | (tar-get-descriptor))) | |
740 | (select-window (posn-window (event-end event))) | |
741 | (goto-char (posn-point (event-end event))) | |
742 | (tar-extract)) | |
aa73f29c RS |
743 | |
744 | (defun tar-extract (&optional other-window-p) | |
628d6cef | 745 | "In Tar mode, extract this entry of the tar file into its own buffer." |
aa73f29c RS |
746 | (interactive) |
747 | (let* ((view-p (eq other-window-p 'view)) | |
439fa06f | 748 | (descriptor (tar-get-descriptor)) |
aa73f29c RS |
749 | (tokens (tar-desc-tokens descriptor)) |
750 | (name (tar-header-name tokens)) | |
751 | (size (tar-header-size tokens)) | |
aa73f29c RS |
752 | (start (+ (tar-desc-data-start descriptor) tar-header-offset -1)) |
753 | (end (+ start size))) | |
aa73f29c | 754 | (let* ((tar-buffer (current-buffer)) |
1b33e237 | 755 | (tar-buffer-multibyte enable-multibyte-characters) |
c09655bc | 756 | (tarname (file-name-nondirectory (buffer-file-name))) |
aa73f29c | 757 | (bufname (concat (file-name-nondirectory name) |
c09655bc RS |
758 | " (" |
759 | tarname | |
aa73f29c RS |
760 | ")")) |
761 | (read-only-p (or buffer-read-only view-p)) | |
762 | (buffer (get-buffer bufname)) | |
763 | (just-created nil)) | |
764 | (if buffer | |
765 | nil | |
766 | (setq buffer (get-buffer-create bufname)) | |
767 | (setq just-created t) | |
768 | (unwind-protect | |
769 | (progn | |
770 | (widen) | |
1b33e237 | 771 | (set-buffer-multibyte nil) |
aa73f29c RS |
772 | (save-excursion |
773 | (set-buffer buffer) | |
1b33e237 KH |
774 | (if enable-multibyte-characters |
775 | (progn | |
776 | ;; We must avoid unibyte->multibyte conversion. | |
777 | (set-buffer-multibyte nil) | |
778 | (insert-buffer-substring tar-buffer start end) | |
779 | (set-buffer-multibyte t)) | |
780 | (insert-buffer-substring tar-buffer start end)) | |
aa73f29c | 781 | (goto-char 0) |
1bc28099 | 782 | (setq buffer-file-name |
95160594 RS |
783 | ;; `:' is not allowed on Windows |
784 | (expand-file-name (concat tarname "!" name))) | |
fef5a0be RS |
785 | (setq buffer-file-truename |
786 | (abbreviate-file-name buffer-file-name)) | |
47414bc1 RS |
787 | ;; We need to mimic the parts of insert-file-contents |
788 | ;; which determine the coding-system and decode the text. | |
789 | (let ((coding | |
790 | (and set-auto-coding-function | |
32dcfa29 | 791 | (save-excursion |
47e1dcfe KH |
792 | (funcall set-auto-coding-function |
793 | name (point-max))))) | |
47414bc1 RS |
794 | (multibyte enable-multibyte-characters) |
795 | (detected (detect-coding-region | |
9e169221 | 796 | 1 (min 16384 (point-max)) t))) |
47414bc1 RS |
797 | (if coding |
798 | (or (numberp (coding-system-eol-type coding)) | |
799 | (setq coding (coding-system-change-eol-conversion | |
800 | coding | |
801 | (coding-system-eol-type detected)))) | |
802 | (setq coding | |
803 | (or (find-new-buffer-file-coding-system detected) | |
804 | (let ((file-coding | |
805 | (find-operation-coding-system | |
806 | 'insert-file-contents buffer-file-name))) | |
807 | (if (consp file-coding) | |
808 | (setq file-coding (car file-coding)) | |
809 | file-coding))))) | |
810 | (if (or (eq coding 'no-conversion) | |
811 | (eq (coding-system-type coding) 5)) | |
812 | (setq multibyte (set-buffer-multibyte nil))) | |
813 | (or multibyte | |
814 | (setq coding | |
815 | (coding-system-change-text-conversion | |
816 | coding 'raw-text))) | |
817 | (decode-coding-region 1 (point-max) coding) | |
818 | (set-buffer-file-coding-system coding)) | |
fef5a0be RS |
819 | ;; Set the default-directory to the dir of the |
820 | ;; superior buffer. | |
821 | (setq default-directory | |
822 | (save-excursion | |
823 | (set-buffer tar-buffer) | |
824 | default-directory)) | |
aa73f29c | 825 | (normal-mode) ; pick a mode. |
aa73f29c | 826 | (rename-buffer bufname) |
0f8becaa ER |
827 | (make-local-variable 'tar-superior-buffer) |
828 | (make-local-variable 'tar-superior-descriptor) | |
829 | (setq tar-superior-buffer tar-buffer) | |
830 | (setq tar-superior-descriptor descriptor) | |
76605277 RS |
831 | (setq buffer-read-only read-only-p) |
832 | (set-buffer-modified-p nil) | |
833 | (tar-subfile-mode 1)) | |
aa73f29c | 834 | (set-buffer tar-buffer)) |
1b33e237 KH |
835 | (narrow-to-region 1 tar-header-offset) |
836 | (set-buffer-multibyte tar-buffer-multibyte))) | |
aa73f29c | 837 | (if view-p |
3eb37b08 | 838 | (view-buffer buffer (and just-created 'kill-buffer)) |
e865c5ce RS |
839 | (if (eq other-window-p 'display) |
840 | (display-buffer buffer) | |
841 | (if other-window-p | |
842 | (switch-to-buffer-other-window buffer) | |
843 | (switch-to-buffer buffer))))))) | |
aa73f29c RS |
844 | |
845 | ||
846 | (defun tar-extract-other-window () | |
e865c5ce | 847 | "*In Tar mode, find this entry of the tar file in another window." |
aa73f29c RS |
848 | (interactive) |
849 | (tar-extract t)) | |
850 | ||
e865c5ce RS |
851 | (defun tar-display-other-window () |
852 | "*In Tar mode, display this entry of the tar file in another window." | |
853 | (interactive) | |
854 | (tar-extract 'display)) | |
855 | ||
aa73f29c | 856 | (defun tar-view () |
e865c5ce | 857 | "*In Tar mode, view the tar file entry on this line." |
aa73f29c RS |
858 | (interactive) |
859 | (tar-extract 'view)) | |
860 | ||
861 | ||
862 | (defun tar-read-file-name (&optional prompt) | |
e865c5ce | 863 | "Read a file name with this line's entry as the default." |
aa73f29c RS |
864 | (or prompt (setq prompt "Copy to: ")) |
865 | (let* ((default-file (expand-file-name | |
866 | (tar-header-name (tar-desc-tokens | |
867 | (tar-current-descriptor))))) | |
868 | (target (expand-file-name | |
869 | (read-file-name prompt | |
870 | (file-name-directory default-file) | |
871 | default-file nil)))) | |
872 | (if (or (string= "" (file-name-nondirectory target)) | |
873 | (file-directory-p target)) | |
874 | (setq target (concat (if (string-match "/$" target) | |
875 | (substring target 0 (1- (match-end 0))) | |
876 | target) | |
877 | "/" | |
878 | (file-name-nondirectory default-file)))) | |
879 | target)) | |
880 | ||
881 | ||
882 | (defun tar-copy (&optional to-file) | |
e865c5ce | 883 | "*In Tar mode, extract this entry of the tar file into a file on disk. |
aa73f29c RS |
884 | If TO-FILE is not supplied, it is prompted for, defaulting to the name of |
885 | the current tar-entry." | |
886 | (interactive (list (tar-read-file-name))) | |
439fa06f | 887 | (let* ((descriptor (tar-get-descriptor)) |
aa73f29c RS |
888 | (tokens (tar-desc-tokens descriptor)) |
889 | (name (tar-header-name tokens)) | |
890 | (size (tar-header-size tokens)) | |
aa73f29c | 891 | (start (+ (tar-desc-data-start descriptor) tar-header-offset -1)) |
d4ec0200 | 892 | (end (+ start size)) |
1b33e237 | 893 | (multibyte enable-multibyte-characters) |
d4ec0200 RS |
894 | (inhibit-file-name-handlers inhibit-file-name-handlers) |
895 | (inhibit-file-name-operation inhibit-file-name-operation)) | |
6a608e8e KH |
896 | (save-restriction |
897 | (widen) | |
d4ec0200 RS |
898 | ;; Inhibit compressing a subfile again if *both* name and |
899 | ;; to-file are handled by jka-compr | |
900 | (if (and (eq (find-file-name-handler name 'write-region) 'jka-compr-handler) | |
901 | (eq (find-file-name-handler to-file 'write-region) 'jka-compr-handler)) | |
902 | (setq inhibit-file-name-handlers | |
903 | (cons 'jka-compr-handler | |
904 | (and (eq inhibit-file-name-operation 'write-region) | |
905 | inhibit-file-name-handlers)) | |
906 | inhibit-file-name-operation 'write-region)) | |
1b33e237 KH |
907 | (unwind-protect |
908 | (let ((coding-system-for-write 'no-conversion)) | |
909 | (set-buffer-multibyte nil) | |
910 | (write-region start end to-file)) | |
911 | (set-buffer-multibyte multibyte))) | |
6a608e8e | 912 | (message "Copied tar entry %s to %s" name to-file))) |
aa73f29c RS |
913 | |
914 | (defun tar-flag-deleted (p &optional unflag) | |
e865c5ce | 915 | "*In Tar mode, mark this sub-file to be deleted from the tar file. |
aa73f29c RS |
916 | With a prefix argument, mark that many files." |
917 | (interactive "p") | |
918 | (beginning-of-line) | |
919 | (tar-dotimes (i (if (< p 0) (- p) p)) | |
920 | (if (tar-current-descriptor unflag) ; barf if we're not on an entry-line. | |
921 | (progn | |
922 | (delete-char 1) | |
923 | (insert (if unflag " " "D")))) | |
924 | (forward-line (if (< p 0) -1 1))) | |
925 | (if (eobp) nil (forward-char 36))) | |
926 | ||
927 | (defun tar-unflag (p) | |
e865c5ce | 928 | "*In Tar mode, un-mark this sub-file if it is marked to be deleted. |
aa73f29c RS |
929 | With a prefix argument, un-mark that many files forward." |
930 | (interactive "p") | |
931 | (tar-flag-deleted p t)) | |
932 | ||
933 | (defun tar-unflag-backwards (p) | |
e865c5ce | 934 | "*In Tar mode, un-mark this sub-file if it is marked to be deleted. |
aa73f29c RS |
935 | With a prefix argument, un-mark that many files backward." |
936 | (interactive "p") | |
937 | (tar-flag-deleted (- p) t)) | |
938 | ||
939 | ||
1b33e237 | 940 | ;; When this function is called, it is sure that the buffer is unibyte. |
aa73f29c RS |
941 | (defun tar-expunge-internal () |
942 | "Expunge the tar-entry specified by the current line." | |
943 | (let* ((descriptor (tar-current-descriptor)) | |
944 | (tokens (tar-desc-tokens descriptor)) | |
945 | (line (tar-desc-data-start descriptor)) | |
946 | (name (tar-header-name tokens)) | |
947 | (size (tar-header-size tokens)) | |
948 | (link-p (tar-header-link-type tokens)) | |
949 | (start (tar-desc-data-start descriptor)) | |
950 | (following-descs (cdr (memq descriptor tar-parse-info)))) | |
951 | (if link-p (setq size 0)) ; size lies for hard-links. | |
952 | ;; | |
953 | ;; delete the current line... | |
954 | (beginning-of-line) | |
955 | (let ((line-start (point))) | |
956 | (end-of-line) (forward-char) | |
957 | (let ((line-len (- (point) line-start))) | |
958 | (delete-region line-start (point)) | |
959 | ;; | |
a7acbbe4 | 960 | ;; decrement the header-pointer to be in sync... |
aa73f29c RS |
961 | (setq tar-header-offset (- tar-header-offset line-len)))) |
962 | ;; | |
963 | ;; delete the data pointer... | |
964 | (setq tar-parse-info (delq descriptor tar-parse-info)) | |
965 | ;; | |
966 | ;; delete the data from inside the file... | |
967 | (widen) | |
968 | (let* ((data-start (+ start tar-header-offset -513)) | |
969 | (data-end (+ data-start 512 (ash (ash (+ size 511) -9) 9)))) | |
970 | (delete-region data-start data-end) | |
971 | ;; | |
972 | ;; and finally, decrement the start-pointers of all following | |
973 | ;; entries in the archive. This is a pig when deleting a bunch | |
974 | ;; of files at once - we could optimize this to only do the | |
975 | ;; iteration over the files that remain, or only iterate up to | |
976 | ;; the next file to be deleted. | |
977 | (let ((data-length (- data-end data-start))) | |
978 | (tar-dolist (desc following-descs) | |
979 | (tar-setf (tar-desc-data-start desc) | |
980 | (- (tar-desc-data-start desc) data-length)))) | |
981 | )) | |
982 | (narrow-to-region 1 tar-header-offset)) | |
983 | ||
984 | ||
985 | (defun tar-expunge (&optional noconfirm) | |
e865c5ce | 986 | "*In Tar mode, delete all the archived files flagged for deletion. |
aa73f29c RS |
987 | This does not modify the disk image; you must save the tar file itself |
988 | for this to be permanent." | |
989 | (interactive) | |
990 | (if (or noconfirm | |
67501c01 | 991 | (y-or-n-p "Expunge files marked for deletion? ")) |
1b33e237 KH |
992 | (let ((n 0) |
993 | (multibyte enable-multibyte-characters)) | |
994 | (set-buffer-multibyte nil) | |
aa73f29c RS |
995 | (save-excursion |
996 | (goto-char 0) | |
997 | (while (not (eobp)) | |
998 | (if (looking-at "D") | |
999 | (progn (tar-expunge-internal) | |
1000 | (setq n (1+ n))) | |
1001 | (forward-line 1))) | |
1002 | ;; after doing the deletions, add any padding that may be necessary. | |
1003 | (tar-pad-to-blocksize) | |
1b33e237 KH |
1004 | (narrow-to-region 1 tar-header-offset)) |
1005 | (set-buffer-multibyte multibyte) | |
aa73f29c | 1006 | (if (zerop n) |
67501c01 RS |
1007 | (message "Nothing to expunge.") |
1008 | (message "%s files expunged. Be sure to save this buffer." n))))) | |
aa73f29c RS |
1009 | |
1010 | ||
1011 | (defun tar-clear-modification-flags () | |
e865c5ce | 1012 | "Remove the stars at the beginning of each line." |
a7e5e8cb | 1013 | (interactive) |
aa73f29c | 1014 | (save-excursion |
a7e5e8cb | 1015 | (goto-char 1) |
1b33e237 | 1016 | (while (< (position-bytes (point)) tar-header-offset) |
a7e5e8cb | 1017 | (if (not (eq (following-char) ?\ )) |
aa73f29c RS |
1018 | (progn (delete-char 1) (insert " "))) |
1019 | (forward-line 1)))) | |
1020 | ||
1021 | ||
1022 | (defun tar-chown-entry (new-uid) | |
1023 | "*Change the user-id associated with this entry in the tar file. | |
1024 | If this tar file was written by GNU tar, then you will be able to edit | |
1025 | the user 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 UID number: " | |
1036 | (format "%s" (tar-header-uid tokens))))))) | |
1037 | n) | |
1038 | (read-string "New UID string: " (tar-header-uname tokens)))))) | |
1039 | (cond ((stringp new-uid) | |
1040 | (tar-setf (tar-header-uname (tar-desc-tokens (tar-current-descriptor))) | |
1041 | new-uid) | |
1042 | (tar-alter-one-field tar-uname-offset (concat new-uid "\000"))) | |
1043 | (t | |
1044 | (tar-setf (tar-header-uid (tar-desc-tokens (tar-current-descriptor))) | |
1045 | new-uid) | |
1046 | (tar-alter-one-field tar-uid-offset | |
1047 | (concat (substring (format "%6o" new-uid) 0 6) "\000 "))))) | |
1048 | ||
1049 | ||
1050 | (defun tar-chgrp-entry (new-gid) | |
1051 | "*Change the group-id associated with this entry in the tar file. | |
1052 | If this tar file was written by GNU tar, then you will be able to edit | |
1053 | the group id as a string; otherwise, you must edit it as a number. | |
1054 | You can force editing as a number by calling this with a prefix arg. | |
1055 | This does not modify the disk image; you must save the tar file itself | |
1056 | for this to be permanent." | |
1057 | (interactive (list | |
1058 | (let ((tokens (tar-desc-tokens (tar-current-descriptor)))) | |
1059 | (if (or current-prefix-arg | |
1060 | (not (tar-header-magic tokens))) | |
1061 | (let (n) | |
1062 | (while (not (numberp (setq n (read-minibuffer | |
1063 | "New GID number: " | |
1064 | (format "%s" (tar-header-gid tokens))))))) | |
1065 | n) | |
1066 | (read-string "New GID string: " (tar-header-gname tokens)))))) | |
1067 | (cond ((stringp new-gid) | |
1068 | (tar-setf (tar-header-gname (tar-desc-tokens (tar-current-descriptor))) | |
1069 | new-gid) | |
1070 | (tar-alter-one-field tar-gname-offset | |
1071 | (concat new-gid "\000"))) | |
1072 | (t | |
1073 | (tar-setf (tar-header-gid (tar-desc-tokens (tar-current-descriptor))) | |
1074 | new-gid) | |
1075 | (tar-alter-one-field tar-gid-offset | |
1076 | (concat (substring (format "%6o" new-gid) 0 6) "\000 "))))) | |
1077 | ||
1078 | (defun tar-rename-entry (new-name) | |
1079 | "*Change the name associated with this entry in the tar file. | |
1080 | This does not modify the disk image; you must save the tar file itself | |
1081 | for this to be permanent." | |
1082 | (interactive | |
1083 | (list (read-string "New name: " | |
1084 | (tar-header-name (tar-desc-tokens (tar-current-descriptor)))))) | |
439fa06f RS |
1085 | (if (string= "" new-name) (error "zero length name")) |
1086 | (if (> (length new-name) 98) (error "name too long")) | |
aa73f29c RS |
1087 | (tar-setf (tar-header-name (tar-desc-tokens (tar-current-descriptor))) |
1088 | new-name) | |
1089 | (tar-alter-one-field 0 | |
1090 | (substring (concat new-name (make-string 99 0)) 0 99))) | |
1091 | ||
1092 | ||
1093 | (defun tar-chmod-entry (new-mode) | |
1094 | "*Change the protection bits associated with this entry in the tar file. | |
1095 | This does not modify the disk image; you must save the tar file itself | |
1096 | for this to be permanent." | |
1097 | (interactive (list (tar-parse-octal-integer-safe | |
1098 | (read-string "New protection (octal): ")))) | |
1099 | (tar-setf (tar-header-mode (tar-desc-tokens (tar-current-descriptor))) | |
1100 | new-mode) | |
1101 | (tar-alter-one-field tar-mode-offset | |
1102 | (concat (substring (format "%6o" new-mode) 0 6) "\000 "))) | |
1103 | ||
1104 | ||
1105 | (defun tar-alter-one-field (data-position new-data-string) | |
1106 | (let* ((descriptor (tar-current-descriptor)) | |
1b33e237 KH |
1107 | (tokens (tar-desc-tokens descriptor)) |
1108 | (multibyte enable-multibyte-characters)) | |
aa73f29c RS |
1109 | (unwind-protect |
1110 | (save-excursion | |
1111 | ;; | |
1112 | ;; update the header-line. | |
1113 | (beginning-of-line) | |
1114 | (let ((p (point))) | |
1115 | (forward-line 1) | |
1116 | (delete-region p (point)) | |
1bc28099 | 1117 | (insert (tar-header-block-summarize tokens) "\n") |
1b33e237 | 1118 | (setq tar-header-offset (position-bytes (point-max)))) |
aa73f29c RS |
1119 | |
1120 | (widen) | |
1b33e237 | 1121 | (set-buffer-multibyte nil) |
aa73f29c RS |
1122 | (let* ((start (+ (tar-desc-data-start descriptor) tar-header-offset -513))) |
1123 | ;; | |
1124 | ;; delete the old field and insert a new one. | |
1125 | (goto-char (+ start data-position)) | |
1126 | (delete-region (point) (+ (point) (length new-data-string))) ; <-- | |
1127 | (insert new-data-string) ; <-- | |
1128 | ;; | |
1129 | ;; compute a new checksum and insert it. | |
1bc28099 | 1130 | (let ((chk (tar-header-block-checksum |
aa73f29c RS |
1131 | (buffer-substring start (+ start 512))))) |
1132 | (goto-char (+ start tar-chk-offset)) | |
1133 | (delete-region (point) (+ (point) 8)) | |
1134 | (insert (format "%6o" chk)) | |
1135 | (insert 0) | |
1136 | (insert ? ) | |
1137 | (tar-setf (tar-header-checksum tokens) chk) | |
1138 | ;; | |
1139 | ;; ok, make sure we didn't botch it. | |
d246db94 | 1140 | (tar-header-block-check-checksum |
aa73f29c RS |
1141 | (buffer-substring start (+ start 512)) |
1142 | chk (tar-header-name tokens)) | |
1143 | ))) | |
47414bc1 | 1144 | (narrow-to-region 1 tar-header-offset) |
1b33e237 | 1145 | (set-buffer-multibyte multibyte) |
47414bc1 | 1146 | (tar-next-line 0)))) |
aa73f29c RS |
1147 | |
1148 | ||
3d7fc2fb ER |
1149 | (defun tar-octal-time (timeval) |
1150 | ;; Format a timestamp as 11 octal digits. Ghod, I hope this works... | |
1151 | (let ((hibits (car timeval)) (lobits (car (cdr timeval)))) | |
1152 | (insert (format "%05o%01o%05o" | |
1153 | (lsh hibits -2) | |
1154 | (logior (lsh (logand 3 hibits) 1) (> (logand lobits 32768) 0)) | |
1155 | (logand 32767 lobits) | |
1156 | )))) | |
1157 | ||
aa73f29c | 1158 | (defun tar-subfile-save-buffer () |
e865c5ce RS |
1159 | "In tar subfile mode, save this buffer into its parent tar-file buffer. |
1160 | This doesn't write anything to disk; you must save the parent tar-file buffer | |
aa73f29c RS |
1161 | to make your changes permanent." |
1162 | (interactive) | |
0f8becaa | 1163 | (if (not (and (boundp 'tar-superior-buffer) tar-superior-buffer)) |
439fa06f | 1164 | (error "This buffer has no superior tar file buffer")) |
0f8becaa | 1165 | (if (not (and (boundp 'tar-superior-descriptor) tar-superior-descriptor)) |
439fa06f | 1166 | (error "This buffer doesn't have an index into its superior tar file!")) |
aa73f29c RS |
1167 | (save-excursion |
1168 | (let ((subfile (current-buffer)) | |
1b33e237 | 1169 | (subfile-multibyte enable-multibyte-characters) |
47414bc1 | 1170 | (coding buffer-file-coding-system) |
1b33e237 KH |
1171 | (descriptor tar-superior-descriptor) |
1172 | subfile-size) | |
1173 | ;; We must make the current buffer unibyte temporarily to avoid | |
1174 | ;; multibyte->unibyte conversion in `insert-buffer'. | |
1175 | (set-buffer-multibyte nil) | |
1176 | (setq subfile-size (buffer-size)) | |
0f8becaa | 1177 | (set-buffer tar-superior-buffer) |
aa73f29c RS |
1178 | (let* ((tokens (tar-desc-tokens descriptor)) |
1179 | (start (tar-desc-data-start descriptor)) | |
1180 | (name (tar-header-name tokens)) | |
1181 | (size (tar-header-size tokens)) | |
1182 | (size-pad (ash (ash (+ size 511) -9) 9)) | |
1183 | (head (memq descriptor tar-parse-info)) | |
1b33e237 KH |
1184 | (following-descs (cdr head)) |
1185 | (tar-buffer-multibyte enable-multibyte-characters)) | |
aa73f29c RS |
1186 | (if (not head) |
1187 | (error "Can't find this tar file entry in its parent tar file!")) | |
1188 | (unwind-protect | |
1189 | (save-excursion | |
1190 | (widen) | |
1b33e237 | 1191 | (set-buffer-multibyte nil) |
aa73f29c RS |
1192 | ;; delete the old data... |
1193 | (let* ((data-start (+ start tar-header-offset -1)) | |
1194 | (data-end (+ data-start (ash (ash (+ size 511) -9) 9)))) | |
1195 | (delete-region data-start data-end) | |
1196 | ;; insert the new data... | |
1197 | (goto-char data-start) | |
1198 | (insert-buffer subfile) | |
47414bc1 RS |
1199 | (setq subfile-size |
1200 | (encode-coding-region | |
1201 | data-start (+ data-start subfile-size) coding)) | |
aa73f29c RS |
1202 | ;; |
1203 | ;; pad the new data out to a multiple of 512... | |
1204 | (let ((subfile-size-pad (ash (ash (+ subfile-size 511) -9) 9))) | |
1205 | (goto-char (+ data-start subfile-size)) | |
1206 | (insert (make-string (- subfile-size-pad subfile-size) 0)) | |
1207 | ;; | |
1208 | ;; update the data pointer of this and all following files... | |
1209 | (tar-setf (tar-header-size tokens) subfile-size) | |
1210 | (let ((difference (- subfile-size-pad size-pad))) | |
1211 | (tar-dolist (desc following-descs) | |
1212 | (tar-setf (tar-desc-data-start desc) | |
1213 | (+ (tar-desc-data-start desc) difference)))) | |
1214 | ;; | |
1215 | ;; Update the size field in the header block. | |
1216 | (let ((header-start (- data-start 512))) | |
1217 | (goto-char (+ header-start tar-size-offset)) | |
1218 | (delete-region (point) (+ (point) 12)) | |
1219 | (insert (format "%11o" subfile-size)) | |
1220 | (insert ? ) | |
1221 | ;; | |
1222 | ;; Maybe update the datestamp. | |
1223 | (if (not tar-update-datestamp) | |
1224 | nil | |
1225 | (goto-char (+ header-start tar-time-offset)) | |
1226 | (delete-region (point) (+ (point) 12)) | |
3d7fc2fb | 1227 | (insert (tar-octal-time (current-time))) |
aa73f29c RS |
1228 | (insert ? )) |
1229 | ;; | |
1230 | ;; compute a new checksum and insert it. | |
1bc28099 | 1231 | (let ((chk (tar-header-block-checksum |
aa73f29c RS |
1232 | (buffer-substring header-start data-start)))) |
1233 | (goto-char (+ header-start tar-chk-offset)) | |
1234 | (delete-region (point) (+ (point) 8)) | |
1235 | (insert (format "%6o" chk)) | |
1236 | (insert 0) | |
1237 | (insert ? ) | |
1238 | (tar-setf (tar-header-checksum tokens) chk))) | |
1239 | ;; | |
1240 | ;; alter the descriptor-line... | |
1241 | ;; | |
1242 | (let ((position (- (length tar-parse-info) (length head)))) | |
1243 | (goto-char 1) | |
1244 | (next-line position) | |
1245 | (beginning-of-line) | |
1246 | (let ((p (point)) | |
97590737 | 1247 | after |
aa73f29c RS |
1248 | (m (set-marker (make-marker) tar-header-offset))) |
1249 | (forward-line 1) | |
97590737 RS |
1250 | (setq after (point)) |
1251 | ;; Insert the new text after the old, before deleting, | |
1252 | ;; to preserve the window start. | |
1b33e237 KH |
1253 | (let ((line (tar-header-block-summarize tokens t))) |
1254 | (if (multibyte-string-p line) | |
1255 | (insert-before-markers (string-as-unibyte line) "\n") | |
1256 | (insert-before-markers line "\n"))) | |
97590737 | 1257 | (delete-region p after) |
aa73f29c RS |
1258 | (setq tar-header-offset (marker-position m))) |
1259 | ))) | |
1260 | ;; after doing the insertion, add any final padding that may be necessary. | |
1261 | (tar-pad-to-blocksize)) | |
1b33e237 KH |
1262 | (narrow-to-region 1 tar-header-offset) |
1263 | (set-buffer-multibyte tar-buffer-multibyte))) | |
aa73f29c | 1264 | (set-buffer-modified-p t) ; mark the tar file as modified |
47414bc1 | 1265 | (tar-next-line 0) |
aa73f29c | 1266 | (set-buffer subfile) |
1b33e237 KH |
1267 | ;; Restore the buffer multibyteness. |
1268 | (set-buffer-multibyte subfile-multibyte) | |
aa73f29c | 1269 | (set-buffer-modified-p nil) ; mark the tar subfile as unmodified |
67501c01 | 1270 | (message "Saved into tar-buffer `%s'. Be sure to save that buffer!" |
0f8becaa | 1271 | (buffer-name tar-superior-buffer)) |
47414bc1 RS |
1272 | ;; Prevent basic-save-buffer from changing our coding-system. |
1273 | (setq last-coding-system-used buffer-file-coding-system) | |
e865c5ce RS |
1274 | ;; Prevent ordinary saving from happening. |
1275 | t))) | |
aa73f29c RS |
1276 | |
1277 | ||
1b33e237 | 1278 | ;; When this function is called, it is sure that the buffer is unibyte. |
aa73f29c RS |
1279 | (defun tar-pad-to-blocksize () |
1280 | "If we are being anal about tar file blocksizes, fix up the current buffer. | |
1281 | Leaves the region wide." | |
1282 | (if (null tar-anal-blocksize) | |
1283 | nil | |
1284 | (widen) | |
1285 | (let* ((last-desc (nth (1- (length tar-parse-info)) tar-parse-info)) | |
1286 | (start (tar-desc-data-start last-desc)) | |
1287 | (tokens (tar-desc-tokens last-desc)) | |
1288 | (link-p (tar-header-link-type tokens)) | |
1289 | (size (if link-p 0 (tar-header-size tokens))) | |
1290 | (data-end (+ start size)) | |
1291 | (bbytes (ash tar-anal-blocksize 9)) | |
1292 | (pad-to (+ bbytes (* bbytes (/ (1- data-end) bbytes)))) | |
628d6cef | 1293 | (inhibit-read-only t) ; ## |
aa73f29c RS |
1294 | ) |
1295 | ;; If the padding after the last data is too long, delete some; | |
1296 | ;; else insert some until we are padded out to the right number of blocks. | |
1297 | ;; | |
1298 | (goto-char (+ (or tar-header-offset 0) data-end)) | |
1299 | (if (> (1+ (buffer-size)) (+ (or tar-header-offset 0) pad-to)) | |
1300 | (delete-region (+ (or tar-header-offset 0) pad-to) (1+ (buffer-size))) | |
1301 | (insert (make-string (- (+ (or tar-header-offset 0) pad-to) | |
1302 | (1+ (buffer-size))) | |
1303 | 0))) | |
1304 | ))) | |
1305 | ||
1306 | ||
439fa06f | 1307 | ;; Used in write-file-hook to write tar-files out correctly. |
67501c01 RS |
1308 | (defun tar-mode-write-file () |
1309 | (unwind-protect | |
1310 | (save-excursion | |
1311 | (widen) | |
1312 | ;; Doing this here confuses things - the region gets left too wide! | |
1313 | ;; I suppose this is run in a context where changing the buffer is bad. | |
1314 | ;; (tar-pad-to-blocksize) | |
4063eb1c DL |
1315 | ;; tar-header-offset turns out to be null for files fetched with W3, |
1316 | ;; at least. | |
1b33e237 KH |
1317 | (let ((coding-system-for-write 'no-conversion)) |
1318 | (write-region (or (byte-to-position tar-header-offset) | |
1319 | (point-min)) | |
1320 | (point-max) | |
1321 | buffer-file-name nil t)) | |
87aed91b RS |
1322 | (tar-clear-modification-flags) |
1323 | (set-buffer-modified-p nil)) | |
1b33e237 | 1324 | (narrow-to-region 1 (byte-to-position tar-header-offset))) |
67501c01 RS |
1325 | ;; return T because we've written the file. |
1326 | t) | |
92062a09 KH |
1327 | |
1328 | (defun tar-quit () | |
1329 | "Kill the current tar buffer." | |
1330 | (interactive) | |
1331 | (kill-buffer nil)) | |
1332 | ||
aa73f29c | 1333 | \f |
aa73f29c RS |
1334 | (provide 'tar-mode) |
1335 | ||
c88ab9ce | 1336 | ;;; tar-mode.el ends here |