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06b60517 | 1 | ;;; tar-mode.el --- simple editing of tar files from GNU Emacs |
aa73f29c | 2 | |
ab422c4d | 3 | ;; Copyright (C) 1990-1991, 1993-2013 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 | ||
eb3fa2cf | 12 | ;; GNU Emacs is free software: you can redistribute it and/or modify |
b578f267 | 13 | ;; it under the terms of the GNU General Public License as published by |
eb3fa2cf GM |
14 | ;; the Free Software Foundation, either version 3 of the License, or |
15 | ;; (at your option) any later version. | |
b578f267 EN |
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 | |
eb3fa2cf | 23 | ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. |
aa73f29c | 24 | |
22a89ee8 ER |
25 | ;;; Commentary: |
26 | ||
b578f267 EN |
27 | ;; This package attempts to make dealing with Unix 'tar' archives easier. |
28 | ;; When this code is loaded, visiting a file whose name ends in '.tar' will | |
29 | ;; cause the contents of that archive file to be displayed in a Dired-like | |
30 | ;; listing. It is then possible to use the customary Dired keybindings to | |
31 | ;; extract sub-files from that archive, either by reading them into their own | |
32 | ;; editor buffers, or by copying them directly to arbitrary files on disk. | |
33 | ;; It is also possible to delete sub-files from within the tar file and write | |
34 | ;; the modified archive back to disk, or to edit sub-files within the archive | |
35 | ;; and re-insert the modified files into the archive. See the documentation | |
36 | ;; string of tar-mode for more info. | |
37 | ||
38 | ;; This code now understands the extra fields that GNU tar adds to tar files. | |
39 | ||
40 | ;; This interacts correctly with "uncompress.el" in the Emacs library, | |
f1180544 | 41 | ;; which you get with |
b578f267 EN |
42 | ;; |
43 | ;; (autoload 'uncompress-while-visiting "uncompress") | |
44 | ;; (setq auto-mode-alist (cons '("\\.Z$" . uncompress-while-visiting) | |
45 | ;; auto-mode-alist)) | |
46 | ;; | |
47 | ;; Do not attempt to use tar-mode.el with crypt.el, you will lose. | |
48 | ||
f1180544 | 49 | ;; *************** TO DO *************** |
b578f267 EN |
50 | ;; |
51 | ;; o chmod should understand "a+x,og-w". | |
52 | ;; | |
f1180544 | 53 | ;; o It's not possible to add a NEW file to a tar archive; not that |
b578f267 EN |
54 | ;; important, but still... |
55 | ;; | |
56 | ;; o The code is less efficient that it could be - in a lot of places, I | |
57 | ;; pull a 512-character string out of the buffer and parse it, when I could | |
58 | ;; be parsing it in place, not garbaging a string. Should redo that. | |
59 | ;; | |
60 | ;; o I'd like a command that searches for a string/regexp in every subfile | |
61 | ;; of an archive, where <esc> would leave you in a subfile-edit buffer. | |
62 | ;; (Like the Meta-R command of the Zmacs mail reader.) | |
63 | ;; | |
f1180544 | 64 | ;; o Sometimes (but not always) reverting the tar-file buffer does not |
b578f267 EN |
65 | ;; re-grind the listing, and you are staring at the binary tar data. |
66 | ;; Typing 'g' again immediately after that will always revert and re-grind | |
67 | ;; it, though. I have no idea why this happens. | |
68 | ;; | |
69 | ;; o Tar-mode interacts poorly with crypt.el and zcat.el because the tar | |
70 | ;; write-file-hook actually writes the file. Instead it should remove the | |
71 | ;; header (and conspire to put it back afterwards) so that other write-file | |
72 | ;; hooks which frob the buffer have a chance to do their dirty work. There | |
73 | ;; might be a problem if the tar write-file-hook does not come *first* on | |
74 | ;; the list. | |
75 | ;; | |
f1180544 | 76 | ;; o Block files, sparse files, continuation files, and the various header |
b578f267 EN |
77 | ;; types aren't editable. Actually I don't know that they work at all. |
78 | ||
79 | ;; Rationale: | |
80 | ||
81 | ;; Why does tar-mode edit the file itself instead of using tar? | |
82 | ||
83 | ;; That means that you can edit tar files which you don't have room for | |
84 | ;; on your local disk. | |
85 | ||
86 | ;; I don't know about recent features in gnu tar, but old versions of tar | |
87 | ;; can't replace a file in the middle of a tar file with a new version. | |
88 | ;; Tar-mode can. I don't think tar can do things like chmod the subfiles. | |
89 | ;; An implementation which involved unpacking and repacking the file into | |
90 | ;; some scratch directory would be very wasteful, and wouldn't be able to | |
91 | ;; preserve the file owners. | |
ce210066 | 92 | |
f598e45e SM |
93 | ;;; Bugs: |
94 | ||
58d6a142 | 95 | ;; - Rename on ././@LongLink files |
f598e45e | 96 | ;; - Revert confirmation displays the raw data temporarily. |
f598e45e | 97 | |
22a89ee8 ER |
98 | ;;; Code: |
99 | ||
a464a6c7 | 100 | (eval-when-compile (require 'cl-lib)) |
f598e45e | 101 | |
b4dd2e66 SE |
102 | (defgroup tar nil |
103 | "Simple editing of tar files." | |
104 | :prefix "tar-" | |
105 | :group 'data) | |
106 | ||
107 | (defcustom tar-anal-blocksize 20 | |
8560523d | 108 | "The blocksize of tar files written by Emacs, or nil, meaning don't care. |
aa73f29c | 109 | The blocksize of a tar file is not really the size of the blocks; rather, it is |
f1180544 | 110 | the number of blocks written with one system call. When tarring to a tape, |
aa73f29c RS |
111 | this is the size of the *tape* blocks, but when writing to a file, it doesn't |
112 | matter much. The only noticeable difference is that if a tar file does not | |
113 | have a blocksize of 20, tar will tell you that; all this really controls is | |
b4dd2e66 SE |
114 | how many null padding bytes go on the end of the tar file." |
115 | :type '(choice integer (const nil)) | |
116 | :group 'tar) | |
aa73f29c | 117 | |
b4dd2e66 | 118 | (defcustom tar-update-datestamp nil |
8560523d | 119 | "Non-nil means Tar mode should play fast and loose with sub-file datestamps. |
30712209 | 120 | If this is true, then editing and saving a tar file entry back into its |
aa73f29c RS |
121 | tar file will update its datestamp. If false, the datestamp is unchanged. |
122 | You may or may not want this - it is good in that you can tell when a file | |
123 | in a tar archive has been changed, but it is bad for the same reason that | |
f1180544 | 124 | editing a file in the tar archive at all is bad - the changed version of |
b4dd2e66 SE |
125 | the file never exists on disk." |
126 | :type 'boolean | |
127 | :group 'tar) | |
aa73f29c | 128 | |
b4dd2e66 | 129 | (defcustom tar-mode-show-date nil |
8560523d | 130 | "Non-nil means Tar mode should show the date/time of each subfile. |
b4dd2e66 SE |
131 | This information is useful, but it takes screen space away from file names." |
132 | :type 'boolean | |
133 | :group 'tar) | |
30712209 | 134 | |
0f8becaa | 135 | (defvar tar-parse-info nil) |
d84b6108 GM |
136 | (defvar tar-superior-buffer nil |
137 | "Buffer containing the tar archive from which a member was extracted.") | |
138 | (defvar tar-superior-descriptor nil | |
139 | "Tar descriptor for a member extracted from an archive.") | |
d26e6665 | 140 | (defvar tar-file-name-coding-system nil) |
1c0b3743 | 141 | |
1c0b3743 RS |
142 | (put 'tar-superior-buffer 'permanent-local t) |
143 | (put 'tar-superior-descriptor 'permanent-local t) | |
f598e45e SM |
144 | |
145 | ;; The Tar data is made up of bytes and better manipulated as bytes | |
146 | ;; and can be very large, so insert/delete can be costly. The summary we | |
91af3942 | 147 | ;; want to display may contain non-ascii chars, of course, so we'd like it |
f598e45e SM |
148 | ;; to be multibyte. We used to keep both in the same buffer and switch |
149 | ;; from/to uni/multibyte. But this had several downsides: | |
150 | ;; - set-buffer-multibyte has an O(N^2) worst case that tends to be triggered | |
151 | ;; here, so it gets atrociously slow on large Tar files. | |
152 | ;; - need to widen/narrow the buffer to show/hide the raw data, and need to | |
153 | ;; maintain a tar-header-offset that keeps track of the boundary between | |
154 | ;; the two. | |
155 | ;; - can't use markers because they're not preserved by set-buffer-multibyte. | |
156 | ;; So instead, we now keep the two pieces of data in separate buffers, and | |
157 | ;; use the new buffer-swap-text primitive when we need to change which data | |
158 | ;; is associated with "the" buffer. | |
159 | (defvar tar-data-buffer nil "Buffer that holds the actual raw tar bytes.") | |
160 | (make-variable-buffer-local 'tar-data-buffer) | |
161 | ||
19eb68d0 SM |
162 | (defvar tar-data-swapped nil |
163 | "If non-nil, `tar-data-buffer' indeed holds raw tar bytes.") | |
164 | (make-variable-buffer-local 'tar-data-swapped) | |
165 | ||
f598e45e SM |
166 | (defun tar-data-swapped-p () |
167 | "Return non-nil if the tar-data is in `tar-data-buffer'." | |
19eb68d0 SM |
168 | (and (buffer-live-p tar-data-buffer) |
169 | ;; Sanity check to try and make sure tar-data-swapped tracks the swap | |
170 | ;; state correctly: the raw data is expected to be always larger than | |
171 | ;; the summary. | |
172 | (progn | |
a464a6c7 | 173 | (cl-assert (or (= (buffer-size tar-data-buffer) (buffer-size)) |
4062011e SM |
174 | (eq tar-data-swapped |
175 | (> (buffer-size tar-data-buffer) (buffer-size))))) | |
19eb68d0 | 176 | tar-data-swapped))) |
d3a36099 AS |
177 | |
178 | (defun tar-swap-data () | |
179 | "Swap buffer contents between current buffer and `tar-data-buffer'. | |
180 | Preserve the modified states of the buffers and set `buffer-swapped-with'." | |
181 | (let ((data-buffer-modified-p (buffer-modified-p tar-data-buffer)) | |
182 | (current-buffer-modified-p (buffer-modified-p))) | |
183 | (buffer-swap-text tar-data-buffer) | |
19eb68d0 SM |
184 | (setq tar-data-swapped (not tar-data-swapped)) |
185 | (restore-buffer-modified-p data-buffer-modified-p) | |
d3a36099 | 186 | (with-current-buffer tar-data-buffer |
19eb68d0 | 187 | (restore-buffer-modified-p current-buffer-modified-p)))) |
aa73f29c | 188 | \f |
aa73f29c RS |
189 | ;;; down to business. |
190 | ||
a464a6c7 | 191 | (cl-defstruct (tar-header |
61bb55d0 SM |
192 | (:constructor nil) |
193 | (:type vector) | |
194 | :named | |
195 | (:constructor | |
196 | make-tar-header (data-start name mode uid gid size date checksum | |
197 | link-type link-name magic uname gname dmaj dmin))) | |
198 | data-start name mode uid gid size date checksum link-type link-name | |
58d6a142 SM |
199 | magic uname gname dmaj dmin |
200 | ;; Start of the header can be nil (meaning it's 512 bytes before data-start) | |
201 | ;; or a marker (in case the header uses LongLink thingies). | |
202 | header-start) | |
aa73f29c RS |
203 | |
204 | (defconst tar-name-offset 0) | |
205 | (defconst tar-mode-offset (+ tar-name-offset 100)) | |
206 | (defconst tar-uid-offset (+ tar-mode-offset 8)) | |
207 | (defconst tar-gid-offset (+ tar-uid-offset 8)) | |
208 | (defconst tar-size-offset (+ tar-gid-offset 8)) | |
209 | (defconst tar-time-offset (+ tar-size-offset 12)) | |
210 | (defconst tar-chk-offset (+ tar-time-offset 12)) | |
211 | (defconst tar-linkp-offset (+ tar-chk-offset 8)) | |
212 | (defconst tar-link-offset (+ tar-linkp-offset 1)) | |
213 | ;;; GNU-tar specific slots. | |
214 | (defconst tar-magic-offset (+ tar-link-offset 100)) | |
215 | (defconst tar-uname-offset (+ tar-magic-offset 8)) | |
216 | (defconst tar-gname-offset (+ tar-uname-offset 32)) | |
217 | (defconst tar-dmaj-offset (+ tar-gname-offset 32)) | |
218 | (defconst tar-dmin-offset (+ tar-dmaj-offset 8)) | |
034e32b0 JL |
219 | (defconst tar-prefix-offset (+ tar-dmin-offset 8)) |
220 | (defconst tar-end-offset (+ tar-prefix-offset 155)) | |
aa73f29c | 221 | |
61bb55d0 SM |
222 | (defun tar-roundup-512 (s) |
223 | "Round S up to the next multiple of 512." | |
224 | (ash (ash (+ s 511) -9) 9)) | |
abef340a | 225 | |
d3a36099 | 226 | (defun tar-header-block-tokenize (pos coding) |
e865c5ce | 227 | "Return a `tar-header' structure. |
f1180544 | 228 | This is a list of name, mode, uid, gid, size, |
e865c5ce | 229 | write-date, checksum, link-type, and link-name." |
dc4e3ccc | 230 | (if (> (+ pos 512) (point-max)) (error "Malformed Tar header")) |
a464a6c7 SM |
231 | (cl-assert (zerop (mod (- pos (point-min)) 512))) |
232 | (cl-assert (not enable-multibyte-characters)) | |
61bb55d0 SM |
233 | (let ((string (buffer-substring pos (setq pos (+ pos 512))))) |
234 | (when ;(some 'plusp string) ; <-- oops, massive cycle hog! | |
235 | (or (not (= 0 (aref string 0))) ; This will do. | |
236 | (not (= 0 (aref string 101)))) | |
237 | (let* ((name-end tar-mode-offset) | |
238 | (link-end (1- tar-magic-offset)) | |
239 | (uname-end (1- tar-gname-offset)) | |
240 | (gname-end (1- tar-dmaj-offset)) | |
241 | (link-p (aref string tar-linkp-offset)) | |
242 | (magic-str (substring string tar-magic-offset | |
64ac1266 SM |
243 | ;; The magic string is actually 6bytes |
244 | ;; of magic string plus 2bytes of version | |
245 | ;; which we here ignore. | |
246 | (- tar-uname-offset 2))) | |
247 | ;; The magic string is "ustar\0" for POSIX format, and | |
248 | ;; "ustar " for GNU Tar's format. | |
249 | (uname-valid-p (car (member magic-str '("ustar " "ustar\0")))) | |
61bb55d0 SM |
250 | name linkname |
251 | (nulsexp "[^\000]*\000")) | |
252 | (when (string-match nulsexp string tar-name-offset) | |
253 | (setq name-end (min name-end (1- (match-end 0))))) | |
254 | (when (string-match nulsexp string tar-link-offset) | |
255 | (setq link-end (min link-end (1- (match-end 0))))) | |
256 | (when (string-match nulsexp string tar-uname-offset) | |
257 | (setq uname-end (min uname-end (1- (match-end 0))))) | |
258 | (when (string-match nulsexp string tar-gname-offset) | |
259 | (setq gname-end (min gname-end (1- (match-end 0))))) | |
260 | (setq name (substring string tar-name-offset name-end) | |
261 | link-p (if (or (= link-p 0) (= link-p ?0)) | |
262 | nil | |
263 | (- link-p ?0))) | |
264 | (setq linkname (substring string tar-link-offset link-end)) | |
64ac1266 | 265 | (when (and (equal uname-valid-p "ustar\0") |
61bb55d0 SM |
266 | (string-match nulsexp string tar-prefix-offset) |
267 | (> (match-end 0) (1+ tar-prefix-offset))) | |
268 | (setq name (concat (substring string tar-prefix-offset | |
269 | (1- (match-end 0))) | |
270 | "/" name))) | |
597e2240 | 271 | (if (default-value 'enable-multibyte-characters) |
61bb55d0 | 272 | (setq name |
d3a36099 | 273 | (decode-coding-string name coding) |
61bb55d0 | 274 | linkname |
d3a36099 | 275 | (decode-coding-string linkname coding))) |
61bb55d0 SM |
276 | (if (and (null link-p) (string-match "/\\'" name)) |
277 | (setq link-p 5)) ; directory | |
278 | ||
279 | (if (and (equal name "././@LongLink") | |
e66f4dfb SM |
280 | ;; Supposedly @LongLink is only used for GNUTAR |
281 | ;; format (i.e. "ustar ") but some POSIX Tar files | |
282 | ;; (with "ustar\0") have been seen using it as well. | |
283 | (member magic-str '("ustar " "ustar\0"))) | |
61bb55d0 SM |
284 | ;; This is a GNU Tar long-file-name header. |
285 | (let* ((size (tar-parse-octal-integer | |
286 | string tar-size-offset tar-time-offset)) | |
287 | ;; -1 so as to strip the terminating 0 byte. | |
abef340a | 288 | (name (decode-coding-string |
fd057fd2 | 289 | (buffer-substring pos (+ pos size -1)) coding)) |
61bb55d0 | 290 | (descriptor (tar-header-block-tokenize |
19eb68d0 SM |
291 | (+ pos (tar-roundup-512 size)) |
292 | coding))) | |
61bb55d0 SM |
293 | (cond |
294 | ((eq link-p (- ?L ?0)) ;GNUTYPE_LONGNAME. | |
295 | (setf (tar-header-name descriptor) name)) | |
296 | ((eq link-p (- ?K ?0)) ;GNUTYPE_LONGLINK. | |
297 | (setf (tar-header-link-name descriptor) name)) | |
298 | (t | |
299 | (message "Unrecognized GNU Tar @LongLink format"))) | |
58d6a142 SM |
300 | (setf (tar-header-header-start descriptor) |
301 | (copy-marker (- pos 512) t)) | |
61bb55d0 | 302 | descriptor) |
abef340a | 303 | |
61bb55d0 SM |
304 | (make-tar-header |
305 | (copy-marker pos nil) | |
306 | name | |
307 | (tar-parse-octal-integer string tar-mode-offset tar-uid-offset) | |
308 | (tar-parse-octal-integer string tar-uid-offset tar-gid-offset) | |
309 | (tar-parse-octal-integer string tar-gid-offset tar-size-offset) | |
310 | (tar-parse-octal-integer string tar-size-offset tar-time-offset) | |
311 | (tar-parse-octal-long-integer string tar-time-offset tar-chk-offset) | |
312 | (tar-parse-octal-integer string tar-chk-offset tar-linkp-offset) | |
313 | link-p | |
314 | linkname | |
315 | uname-valid-p | |
4062011e SM |
316 | (when uname-valid-p |
317 | (decode-coding-string | |
318 | (substring string tar-uname-offset uname-end) coding)) | |
319 | (when uname-valid-p | |
320 | (decode-coding-string | |
321 | (substring string tar-gname-offset gname-end) coding)) | |
61bb55d0 SM |
322 | (tar-parse-octal-integer string tar-dmaj-offset tar-dmin-offset) |
323 | (tar-parse-octal-integer string tar-dmin-offset tar-prefix-offset) | |
324 | )))))) | |
aa73f29c | 325 | |
58d6a142 SM |
326 | ;; Pseudo-field. |
327 | (defun tar-header-data-end (descriptor) | |
328 | (let* ((data-start (tar-header-data-start descriptor)) | |
329 | (link-type (tar-header-link-type descriptor)) | |
31e54db0 AS |
330 | (size (tar-header-size descriptor))) |
331 | (+ data-start | |
332 | ;; Ignore size for files of type 1-6 | |
333 | (if (and (not (memq link-type '(1 2 3 4 5 6))) (> size 0)) | |
58d6a142 SM |
334 | (tar-roundup-512 size) |
335 | 0)))) | |
aa73f29c RS |
336 | |
337 | (defun tar-parse-octal-integer (string &optional start end) | |
aa73f29c RS |
338 | (if (null start) (setq start 0)) |
339 | (if (null end) (setq end (length string))) | |
340 | (if (= (aref string start) 0) | |
341 | 0 | |
342 | (let ((n 0)) | |
343 | (while (< start end) | |
344 | (setq n (if (< (aref string start) ?0) n | |
30712209 | 345 | (+ (* n 8) (- (aref string start) ?0))) |
aa73f29c RS |
346 | start (1+ start))) |
347 | n))) | |
348 | ||
30712209 RS |
349 | (defun tar-parse-octal-long-integer (string &optional start end) |
350 | (if (null start) (setq start 0)) | |
351 | (if (null end) (setq end (length string))) | |
352 | (if (= (aref string start) 0) | |
806cba9c | 353 | (list 0 0) |
30712209 RS |
354 | (let ((lo 0) |
355 | (hi 0)) | |
356 | (while (< start end) | |
357 | (if (>= (aref string start) ?0) | |
358 | (setq lo (+ (* lo 8) (- (aref string start) ?0)) | |
359 | hi (+ (* hi 8) (ash lo -16)) | |
360 | lo (logand lo 65535))) | |
361 | (setq start (1+ start))) | |
362 | (list hi lo)))) | |
363 | ||
aa73f29c | 364 | (defun tar-parse-octal-integer-safe (string) |
8560523d SM |
365 | (if (zerop (length string)) (error "empty string")) |
366 | (mapc (lambda (c) | |
367 | (if (or (< c ?0) (> c ?7)) | |
368 | (error "`%c' is not an octal digit" c))) | |
369 | string) | |
aa73f29c RS |
370 | (tar-parse-octal-integer string)) |
371 | ||
372 | ||
1bc28099 | 373 | (defun tar-header-block-checksum (string) |
e865c5ce | 374 | "Compute and return a tar-acceptable checksum for this block." |
a464a6c7 | 375 | (cl-assert (not (multibyte-string-p string))) |
aa73f29c RS |
376 | (let* ((chk-field-start tar-chk-offset) |
377 | (chk-field-end (+ chk-field-start 8)) | |
378 | (sum 0) | |
379 | (i 0)) | |
380 | ;; Add up all of the characters except the ones in the checksum field. | |
381 | ;; Add that field as if it were filled with spaces. | |
382 | (while (< i chk-field-start) | |
383 | (setq sum (+ sum (aref string i)) | |
384 | i (1+ i))) | |
385 | (setq i chk-field-end) | |
386 | (while (< i 512) | |
387 | (setq sum (+ sum (aref string i)) | |
388 | i (1+ i))) | |
389 | (+ sum (* 32 8)))) | |
390 | ||
1bc28099 | 391 | (defun tar-header-block-check-checksum (hblock desired-checksum file-name) |
aa73f29c | 392 | "Beep and print a warning if the checksum doesn't match." |
1bc28099 | 393 | (if (not (= desired-checksum (tar-header-block-checksum hblock))) |
aa73f29c RS |
394 | (progn (beep) (message "Invalid checksum for file %s!" file-name)))) |
395 | ||
30712209 RS |
396 | (defun tar-clip-time-string (time) |
397 | (let ((str (current-time-string time))) | |
0bfcf5c5 | 398 | (concat " " (substring str 4 16) (format-time-string " %Y" time)))) |
aa73f29c | 399 | |
139f2b7c SM |
400 | (defun tar-grind-file-mode (mode) |
401 | "Construct a `-rw--r--r--' string indicating MODE. | |
6a06ace6 | 402 | MODE should be an integer which is a file mode value." |
139f2b7c SM |
403 | (string |
404 | (if (zerop (logand 256 mode)) ?- ?r) | |
405 | (if (zerop (logand 128 mode)) ?- ?w) | |
7e1361d9 UM |
406 | (if (zerop (logand 2048 mode)) |
407 | (if (zerop (logand 64 mode)) ?- ?x) | |
408 | (if (zerop (logand 64 mode)) ?S ?s)) | |
139f2b7c SM |
409 | (if (zerop (logand 32 mode)) ?- ?r) |
410 | (if (zerop (logand 16 mode)) ?- ?w) | |
7e1361d9 UM |
411 | (if (zerop (logand 1024 mode)) |
412 | (if (zerop (logand 8 mode)) ?- ?x) | |
413 | (if (zerop (logand 8 mode)) ?S ?s)) | |
139f2b7c SM |
414 | (if (zerop (logand 4 mode)) ?- ?r) |
415 | (if (zerop (logand 2 mode)) ?- ?w) | |
7e1361d9 UM |
416 | (if (zerop (logand 512 mode)) |
417 | (if (zerop (logand 1 mode)) ?- ?x) | |
418 | (if (zerop (logand 1 mode)) ?T ?t)))) | |
aa73f29c | 419 | |
1bc28099 | 420 | (defun tar-header-block-summarize (tar-hblock &optional mod-p) |
139f2b7c | 421 | "Return a line similar to the output of `tar -vtf'." |
aa73f29c RS |
422 | (let ((name (tar-header-name tar-hblock)) |
423 | (mode (tar-header-mode tar-hblock)) | |
424 | (uid (tar-header-uid tar-hblock)) | |
425 | (gid (tar-header-gid tar-hblock)) | |
426 | (uname (tar-header-uname tar-hblock)) | |
427 | (gname (tar-header-gname tar-hblock)) | |
428 | (size (tar-header-size tar-hblock)) | |
429 | (time (tar-header-date tar-hblock)) | |
8560523d | 430 | ;; (ck (tar-header-checksum tar-hblock)) |
139f2b7c SM |
431 | (type (tar-header-link-type tar-hblock)) |
432 | (link-name (tar-header-link-name tar-hblock))) | |
32d956a8 | 433 | (format "%c%c%s %7s/%-7s %7s%s %s%s" |
139f2b7c | 434 | (if mod-p ?* ? ) |
aa73f29c | 435 | (cond ((or (eq type nil) (eq type 0)) ?-) |
6ee30a2a RS |
436 | ((eq type 1) ?h) ; link |
437 | ((eq type 2) ?l) ; symlink | |
139f2b7c SM |
438 | ((eq type 3) ?c) ; char special |
439 | ((eq type 4) ?b) ; block special | |
440 | ((eq type 5) ?d) ; directory | |
441 | ((eq type 6) ?p) ; FIFO/pipe | |
442 | ((eq type 20) ?*) ; directory listing | |
f9580781 | 443 | ((eq type 28) ?L) ; next has longname |
139f2b7c SM |
444 | ((eq type 29) ?M) ; multivolume continuation |
445 | ((eq type 35) ?S) ; sparse | |
446 | ((eq type 38) ?V) ; volume header | |
31e54db0 AS |
447 | ((eq type 55) ?H) ; pax global extended header |
448 | ((eq type 72) ?X) ; pax extended header | |
e5d56b61 | 449 | (t ?\s) |
139f2b7c SM |
450 | ) |
451 | (tar-grind-file-mode mode) | |
452 | (if (= 0 (length uname)) uid uname) | |
453 | (if (= 0 (length gname)) gid gname) | |
454 | size | |
455 | (if tar-mode-show-date (tar-clip-time-string time) "") | |
a28eaf2c EZ |
456 | (propertize name |
457 | 'mouse-face 'highlight | |
458 | 'help-echo "mouse-2: extract this file into a buffer") | |
139f2b7c SM |
459 | (if (or (eq type 1) (eq type 2)) |
460 | (concat (if (= type 1) " ==> " " --> ") link-name) | |
461 | "")))) | |
aa73f29c | 462 | |
27129192 | 463 | (defun tar-untar-buffer () |
643415c4 | 464 | "Extract all archive members in the tar-file into the current directory." |
27129192 | 465 | (interactive) |
f598e45e SM |
466 | ;; FIXME: make it work even if we're not in tar-mode. |
467 | (let ((descriptors tar-parse-info)) ;Read the var in its buffer. | |
468 | (with-current-buffer | |
469 | (if (tar-data-swapped-p) tar-data-buffer (current-buffer)) | |
470 | (set-buffer-multibyte nil) ;Hopefully, a no-op. | |
471 | (dolist (descriptor descriptors) | |
61bb55d0 SM |
472 | (let* ((name (tar-header-name descriptor)) |
473 | (dir (if (eq (tar-header-link-type descriptor) 5) | |
f598e45e SM |
474 | name |
475 | (file-name-directory name))) | |
61bb55d0 SM |
476 | (start (tar-header-data-start descriptor)) |
477 | (end (+ start (tar-header-size descriptor)))) | |
f598e45e SM |
478 | (unless (file-directory-p name) |
479 | (message "Extracting %s" name) | |
480 | (if (and dir (not (file-exists-p dir))) | |
481 | (make-directory dir t)) | |
482 | (unless (file-directory-p name) | |
36c9fa27 J |
483 | (let ((coding-system-for-write 'no-conversion)) |
484 | (write-region start end name))) | |
61bb55d0 | 485 | (set-file-modes name (tar-header-mode descriptor)))))))) |
27129192 | 486 | |
aa73f29c | 487 | (defun tar-summarize-buffer () |
61bb55d0 | 488 | "Parse the contents of the tar file in the current buffer." |
a464a6c7 | 489 | (cl-assert (tar-data-swapped-p)) |
f598e45e SM |
490 | (let* ((modified (buffer-modified-p)) |
491 | (result '()) | |
492 | (pos (point-min)) | |
d3a36099 | 493 | (coding tar-file-name-coding-system) |
f598e45e | 494 | (progress-reporter |
dd798c64 SM |
495 | (with-current-buffer tar-data-buffer |
496 | (make-progress-reporter "Parsing tar file..." | |
497 | (point-min) (point-max)))) | |
61bb55d0 | 498 | descriptor) |
f598e45e | 499 | (with-current-buffer tar-data-buffer |
dc4e3ccc | 500 | (while (and (< pos (point-max)) |
d3a36099 | 501 | (setq descriptor (tar-header-block-tokenize pos coding))) |
61bb55d0 | 502 | (let ((size (tar-header-size descriptor))) |
c40d3365 MB |
503 | (if (< size 0) |
504 | (error "%s has size %s - corrupted" | |
58d6a142 SM |
505 | (tar-header-name descriptor) size))) |
506 | ;; | |
507 | ;; This is just too slow. Don't really need it anyway.... | |
508 | ;;(tar-header-block-check-checksum | |
509 | ;; hblock (tar-header-block-checksum hblock) | |
510 | ;; (tar-header-name descriptor)) | |
abef340a | 511 | |
58d6a142 SM |
512 | (push descriptor result) |
513 | (setq pos (tar-header-data-end descriptor)) | |
514 | (progress-reporter-update progress-reporter pos))) | |
515 | ||
61bb55d0 | 516 | (set (make-local-variable 'tar-parse-info) (nreverse result)) |
f598e45e SM |
517 | ;; A tar file should end with a block or two of nulls, |
518 | ;; but let's not get a fatal error if it doesn't. | |
61bb55d0 | 519 | (if (null descriptor) |
f598e45e SM |
520 | (progress-reporter-done progress-reporter) |
521 | (message "Warning: premature EOF parsing tar file")) | |
aa73f29c | 522 | (goto-char (point-min)) |
4c478e6b JL |
523 | (let ((buffer-file-truename nil) ; avoid changing dir mtime by lock_file |
524 | (inhibit-read-only t) | |
c40d3365 | 525 | (total-summaries |
61bb55d0 | 526 | (mapconcat 'tar-header-block-summarize tar-parse-info "\n"))) |
4c478e6b JL |
527 | (insert total-summaries "\n") |
528 | (goto-char (point-min)) | |
529 | (restore-buffer-modified-p modified)))) | |
e865c5ce | 530 | \f |
b016851c SM |
531 | (defvar tar-mode-map |
532 | (let ((map (make-keymap))) | |
533 | (suppress-keymap map) | |
534 | (define-key map " " 'tar-next-line) | |
535 | (define-key map "C" 'tar-copy) | |
536 | (define-key map "d" 'tar-flag-deleted) | |
537 | (define-key map "\^D" 'tar-flag-deleted) | |
538 | (define-key map "e" 'tar-extract) | |
539 | (define-key map "f" 'tar-extract) | |
540 | (define-key map "\C-m" 'tar-extract) | |
541 | (define-key map [mouse-2] 'tar-mouse-extract) | |
542 | (define-key map "g" 'revert-buffer) | |
543 | (define-key map "n" 'tar-next-line) | |
544 | (define-key map "\^N" 'tar-next-line) | |
545 | (define-key map [down] 'tar-next-line) | |
546 | (define-key map "o" 'tar-extract-other-window) | |
547 | (define-key map "p" 'tar-previous-line) | |
548 | (define-key map "\^P" 'tar-previous-line) | |
549 | (define-key map [up] 'tar-previous-line) | |
550 | (define-key map "R" 'tar-rename-entry) | |
551 | (define-key map "u" 'tar-unflag) | |
552 | (define-key map "v" 'tar-view) | |
6b955486 | 553 | (define-key map "w" 'woman-tar-extract-file) |
b016851c SM |
554 | (define-key map "x" 'tar-expunge) |
555 | (define-key map "\177" 'tar-unflag-backwards) | |
556 | (define-key map "E" 'tar-extract-other-window) | |
557 | (define-key map "M" 'tar-chmod-entry) | |
558 | (define-key map "G" 'tar-chgrp-entry) | |
559 | (define-key map "O" 'tar-chown-entry) | |
560 | ;; Let mouse-1 follow the link. | |
561 | (define-key map [follow-link] 'mouse-face) | |
562 | ||
563 | ;; Make menu bar items. | |
564 | ||
565 | ;; Get rid of the Edit menu bar item to save space. | |
566 | (define-key map [menu-bar edit] 'undefined) | |
567 | ||
568 | (define-key map [menu-bar immediate] | |
569 | (cons "Immediate" (make-sparse-keymap "Immediate"))) | |
570 | ||
6b955486 GM |
571 | (define-key map [menu-bar immediate woman] |
572 | '("Read Man Page (WoMan)" . woman-tar-extract-file)) | |
b016851c SM |
573 | (define-key map [menu-bar immediate view] |
574 | '("View This File" . tar-view)) | |
575 | (define-key map [menu-bar immediate display] | |
576 | '("Display in Other Window" . tar-display-other-window)) | |
577 | (define-key map [menu-bar immediate find-file-other-window] | |
578 | '("Find in Other Window" . tar-extract-other-window)) | |
579 | (define-key map [menu-bar immediate find-file] | |
580 | '("Find This File" . tar-extract)) | |
581 | ||
582 | (define-key map [menu-bar mark] | |
583 | (cons "Mark" (make-sparse-keymap "Mark"))) | |
584 | ||
585 | (define-key map [menu-bar mark unmark-all] | |
586 | '("Unmark All" . tar-clear-modification-flags)) | |
587 | (define-key map [menu-bar mark deletion] | |
588 | '("Flag" . tar-flag-deleted)) | |
589 | (define-key map [menu-bar mark unmark] | |
590 | '("Unflag" . tar-unflag)) | |
591 | ||
592 | (define-key map [menu-bar operate] | |
593 | (cons "Operate" (make-sparse-keymap "Operate"))) | |
594 | ||
595 | (define-key map [menu-bar operate chown] | |
596 | '("Change Owner..." . tar-chown-entry)) | |
597 | (define-key map [menu-bar operate chgrp] | |
598 | '("Change Group..." . tar-chgrp-entry)) | |
599 | (define-key map [menu-bar operate chmod] | |
600 | '("Change Mode..." . tar-chmod-entry)) | |
601 | (define-key map [menu-bar operate rename] | |
602 | '("Rename to..." . tar-rename-entry)) | |
603 | (define-key map [menu-bar operate copy] | |
604 | '("Copy to..." . tar-copy)) | |
605 | (define-key map [menu-bar operate expunge] | |
606 | '("Expunge Marked Files" . tar-expunge)) | |
607 | \f | |
608 | map) | |
609 | "Local keymap for Tar mode listings.") | |
c40d3365 | 610 | |
b016851c | 611 | \f |
aa73f29c RS |
612 | ;; tar mode is suitable only for specially formatted data. |
613 | (put 'tar-mode 'mode-class 'special) | |
614 | (put 'tar-subfile-mode 'mode-class 'special) | |
615 | ||
f598e45e SM |
616 | (defun tar-change-major-mode-hook () |
617 | ;; Bring the actual Tar data back into the main buffer. | |
d3a36099 | 618 | (when (tar-data-swapped-p) (tar-swap-data)) |
f598e45e SM |
619 | ;; Throw away the summary. |
620 | (when (buffer-live-p tar-data-buffer) (kill-buffer tar-data-buffer))) | |
621 | ||
622 | (defun tar-mode-kill-buffer-hook () | |
623 | (if (buffer-live-p tar-data-buffer) (kill-buffer tar-data-buffer))) | |
624 | ||
bdd53bbc | 625 | ;;;###autoload |
abef340a | 626 | (define-derived-mode tar-mode special-mode "Tar" |
aa73f29c | 627 | "Major mode for viewing a tar file as a dired-like listing of its contents. |
f1180544 | 628 | You can move around using the usual cursor motion commands. |
aa73f29c | 629 | Letters no longer insert themselves. |
439fa06f RS |
630 | Type `e' to pull a file out of the tar file and into its own buffer; |
631 | or click mouse-2 on the file's line in the Tar mode buffer. | |
e865c5ce | 632 | Type `c' to copy an entry from the tar file into another file on disk. |
aa73f29c | 633 | |
f1180544 | 634 | If you edit a sub-file of this archive (as with the `e' command) and |
8560523d | 635 | save it with \\[save-buffer], the contents of that buffer will be |
f1180544 | 636 | saved back into the tar-file buffer; in this way you can edit a file |
aa73f29c RS |
637 | inside of a tar archive without extracting it and re-archiving it. |
638 | ||
e865c5ce | 639 | See also: variables `tar-update-datestamp' and `tar-anal-blocksize'. |
aa73f29c | 640 | \\{tar-mode-map}" |
6f09f6ed AH |
641 | (and buffer-file-name |
642 | (file-writable-p buffer-file-name) | |
643 | (setq buffer-read-only nil)) ; undo what `special-mode' did | |
aa73f29c | 644 | (make-local-variable 'tar-parse-info) |
a91c76d6 | 645 | (set (make-local-variable 'require-final-newline) nil) ; binary data, dude... |
a91c76d6 SM |
646 | (set (make-local-variable 'local-enable-local-variables) nil) |
647 | (set (make-local-variable 'next-line-add-newlines) nil) | |
d26e6665 KH |
648 | (set (make-local-variable 'tar-file-name-coding-system) |
649 | (or file-name-coding-system | |
650 | default-file-name-coding-system | |
651 | locale-coding-system)) | |
b9ca3cdb | 652 | ;; Prevent loss of data when saving the file. |
a91c76d6 | 653 | (set (make-local-variable 'file-precious-flag) t) |
03b00795 | 654 | (buffer-disable-undo) |
aa73f29c | 655 | (widen) |
f598e45e SM |
656 | ;; Now move the Tar data into an auxiliary buffer, so we can use the main |
657 | ;; buffer for the summary. | |
a464a6c7 | 658 | (cl-assert (not (tar-data-swapped-p))) |
f598e45e | 659 | (set (make-local-variable 'revert-buffer-function) 'tar-mode-revert) |
3006c8dc SM |
660 | ;; We started using write-contents-functions, but this hook is not |
661 | ;; used during auto-save, so we now use | |
662 | ;; write-region-annotate-functions which hooks at a lower-level. | |
663 | (add-hook 'write-region-annotate-functions 'tar-write-region-annotate nil t) | |
f598e45e SM |
664 | (add-hook 'kill-buffer-hook 'tar-mode-kill-buffer-hook nil t) |
665 | (add-hook 'change-major-mode-hook 'tar-change-major-mode-hook nil t) | |
666 | ;; Tar data is made of bytes, not chars. | |
58d6a142 | 667 | (set-buffer-multibyte nil) ;Hopefully a no-op. |
f598e45e SM |
668 | (set (make-local-variable 'tar-data-buffer) |
669 | (generate-new-buffer (format " *tar-data %s*" | |
670 | (file-name-nondirectory | |
671 | (or buffer-file-name (buffer-name)))))) | |
dc4e3ccc SM |
672 | (condition-case err |
673 | (progn | |
674 | (tar-swap-data) | |
675 | (tar-summarize-buffer) | |
676 | (tar-next-line 0)) | |
677 | (error | |
678 | ;; If summarizing caused an error, then maybe the buffer doesn't contain | |
679 | ;; tar data. Rather than show a mysterious empty buffer, let's | |
680 | ;; revert to fundamental-mode. | |
681 | (fundamental-mode) | |
682 | (signal (car err) (cdr err))))) | |
aa73f29c | 683 | |
6b955486 GM |
684 | (autoload 'woman-tar-extract-file "woman" |
685 | "In tar mode, run the WoMan man-page browser on this file." t) | |
aa73f29c | 686 | |
56eb0904 | 687 | (define-minor-mode tar-subfile-mode |
aa73f29c | 688 | "Minor mode for editing an element of a tar-file. |
e1ac4066 GM |
689 | With a prefix argument ARG, enable the mode if ARG is positive, |
690 | and disable it otherwise. If called from Lisp, enable the mode | |
691 | if ARG is omitted or nil. This mode arranges for \"saving\" this | |
692 | buffer to write the data into the tar-file buffer that it came | |
693 | from. The changes will actually appear on disk when you save the | |
694 | tar-file's buffer." | |
56eb0904 SM |
695 | ;; Don't do this, because it is redundant and wastes mode line space. |
696 | ;; :lighter " TarFile" | |
697 | nil nil nil | |
0f8becaa | 698 | (or (and (boundp 'tar-superior-buffer) tar-superior-buffer) |
e865c5ce | 699 | (error "This buffer is not an element of a tar file")) |
aa73f29c | 700 | (cond (tar-subfile-mode |
76bf6666 | 701 | (add-hook 'write-file-functions 'tar-subfile-save-buffer nil t) |
aa73f29c | 702 | ;; turn off auto-save. |
75238436 | 703 | (auto-save-mode -1) |
56eb0904 | 704 | (setq buffer-auto-save-file-name nil)) |
e865c5ce | 705 | (t |
76bf6666 | 706 | (remove-hook 'write-file-functions 'tar-subfile-save-buffer t)))) |
aa73f29c RS |
707 | |
708 | ||
e865c5ce | 709 | ;; Revert the buffer and recompute the dired-like listing. |
f6b0805a | 710 | (defun tar-mode-revert (&optional no-auto-save no-confirm) |
f598e45e SM |
711 | (unwind-protect |
712 | (let ((revert-buffer-function nil)) | |
d3a36099 | 713 | (if (tar-data-swapped-p) (tar-swap-data)) |
f598e45e SM |
714 | ;; FIXME: If we ask for confirmation, the user will be temporarily |
715 | ;; looking at the raw data. | |
716 | (revert-buffer no-auto-save no-confirm 'preserve-modes) | |
f598e45e | 717 | ;; Recompute the summary. |
d3a36099 | 718 | (if (buffer-live-p tar-data-buffer) (kill-buffer tar-data-buffer)) |
f598e45e | 719 | (tar-mode)) |
d3a36099 | 720 | (unless (tar-data-swapped-p) (tar-swap-data)))) |
aa73f29c RS |
721 | |
722 | ||
210f943e PJ |
723 | (defun tar-next-line (arg) |
724 | "Move cursor vertically down ARG lines and to the start of the filename." | |
aa73f29c | 725 | (interactive "p") |
210f943e | 726 | (forward-line arg) |
58d6a142 | 727 | (goto-char (or (next-single-property-change (point) 'mouse-face) (point)))) |
aa73f29c | 728 | |
210f943e PJ |
729 | (defun tar-previous-line (arg) |
730 | "Move cursor vertically up ARG lines and to the start of the filename." | |
aa73f29c | 731 | (interactive "p") |
210f943e | 732 | (tar-next-line (- arg))) |
aa73f29c RS |
733 | |
734 | (defun tar-current-descriptor (&optional noerror) | |
e865c5ce | 735 | "Return the tar-descriptor of the current line, or signals an error." |
aa73f29c | 736 | ;; I wish lines had plists, like in ZMACS... |
f598e45e | 737 | (or (nth (count-lines (point-min) (line-beginning-position)) |
aa73f29c RS |
738 | tar-parse-info) |
739 | (if noerror | |
740 | nil | |
439fa06f | 741 | (error "This line does not describe a tar-file entry")))) |
aa73f29c | 742 | |
fd846ab4 SM |
743 | (defun tar--check-descriptor (descriptor) |
744 | (let ((link-p (tar-header-link-type descriptor))) | |
439fa06f | 745 | (if link-p |
bf65c664 CY |
746 | (error "This is %s, not a real file" |
747 | (cond ((eq link-p 5) "a directory") | |
748 | ((eq link-p 20) "a tar directory header") | |
749 | ((eq link-p 28) "a next has longname") | |
750 | ((eq link-p 29) "a multivolume-continuation") | |
751 | ((eq link-p 35) "a sparse entry") | |
752 | ((eq link-p 38) "a volume header") | |
31e54db0 AS |
753 | ((eq link-p 55) "a pax global extended header") |
754 | ((eq link-p 72) "a pax extended header") | |
fd846ab4 SM |
755 | (t "a link")))))) |
756 | ||
757 | (defun tar-get-descriptor () | |
758 | (let* ((descriptor (tar-current-descriptor)) | |
759 | (size (tar-header-size descriptor))) | |
760 | (tar--check-descriptor descriptor) | |
f09bbd93 | 761 | (if (zerop size) (message "This is a zero-length file")) |
439fa06f RS |
762 | descriptor)) |
763 | ||
fd846ab4 SM |
764 | (defun tar-get-file-descriptor (file) |
765 | ;; Used by package.el. | |
766 | (let ((desc ())) | |
767 | (dolist (hdr tar-parse-info) | |
768 | (when (equal file (tar-header-name hdr)) | |
769 | (setq desc hdr))) | |
770 | (tar--check-descriptor desc) | |
771 | desc)) | |
772 | ||
439fa06f RS |
773 | (defun tar-mouse-extract (event) |
774 | "Extract a file whose tar directory line you click on." | |
775 | (interactive "e") | |
53ad7bee | 776 | (with-current-buffer (window-buffer (posn-window (event-end event))) |
439fa06f RS |
777 | (save-excursion |
778 | (goto-char (posn-point (event-end event))) | |
779 | ;; Just make sure this doesn't get an error. | |
780 | (tar-get-descriptor))) | |
781 | (select-window (posn-window (event-end event))) | |
782 | (goto-char (posn-point (event-end event))) | |
783 | (tar-extract)) | |
aa73f29c | 784 | |
07e7a05a EZ |
785 | (defun tar-file-name-handler (op &rest args) |
786 | "Helper function for `tar-extract'." | |
787 | (or (eq op 'file-exists-p) | |
788 | (let ((file-name-handler-alist nil)) | |
789 | (apply op args)))) | |
790 | ||
fd846ab4 SM |
791 | (defun tar--extract (descriptor) |
792 | "Extract this entry of the tar file into its own buffer." | |
793 | (let* ((name (tar-header-name descriptor)) | |
794 | (size (tar-header-size descriptor)) | |
795 | (start (tar-header-data-start descriptor)) | |
796 | (end (+ start size)) | |
797 | (tarname (buffer-name)) | |
798 | (bufname (concat (file-name-nondirectory name) | |
799 | " (" | |
800 | tarname | |
801 | ")")) | |
802 | (buffer (generate-new-buffer bufname))) | |
803 | (with-current-buffer buffer | |
804 | (setq buffer-undo-list t)) | |
805 | (with-current-buffer tar-data-buffer | |
806 | (let (coding) | |
807 | (narrow-to-region start end) | |
808 | (goto-char start) | |
809 | (setq coding (or coding-system-for-read | |
810 | (and set-auto-coding-function | |
811 | (funcall set-auto-coding-function | |
812 | name (- end start))) | |
813 | ;; The following binding causes | |
814 | ;; find-buffer-file-type-coding-system | |
815 | ;; (defined on dos-w32.el) to act as if | |
816 | ;; the file being extracted existed, so | |
817 | ;; that the file's contents' encoding and | |
818 | ;; EOL format are auto-detected. | |
819 | (let ((file-name-handler-alist | |
820 | '(("" . tar-file-name-handler)))) | |
821 | (car (find-operation-coding-system | |
822 | 'insert-file-contents | |
823 | (cons name (current-buffer)) t))))) | |
824 | (if (or (not coding) | |
825 | (eq (coding-system-type coding) 'undecided)) | |
826 | (setq coding (detect-coding-region start end t))) | |
827 | (if (and (default-value 'enable-multibyte-characters) | |
828 | (coding-system-get coding :for-unibyte)) | |
829 | (with-current-buffer buffer | |
830 | (set-buffer-multibyte nil))) | |
831 | (widen) | |
832 | (decode-coding-region start end coding buffer))) | |
833 | buffer)) | |
834 | ||
aa73f29c | 835 | (defun tar-extract (&optional other-window-p) |
628d6cef | 836 | "In Tar mode, extract this entry of the tar file into its own buffer." |
aa73f29c RS |
837 | (interactive) |
838 | (let* ((view-p (eq other-window-p 'view)) | |
439fa06f | 839 | (descriptor (tar-get-descriptor)) |
61bb55d0 | 840 | (name (tar-header-name descriptor)) |
fd846ab4 SM |
841 | (tar-buffer (current-buffer)) |
842 | (tarname (buffer-name)) | |
843 | (read-only-p (or buffer-read-only view-p)) | |
844 | (new-buffer-file-name (expand-file-name | |
845 | ;; `:' is not allowed on Windows | |
846 | (concat tarname "!" | |
847 | (if (string-match "/" name) | |
848 | name | |
849 | ;; Make sure `name' contains a / | |
850 | ;; so set-auto-mode doesn't try | |
851 | ;; to look at `tarname' for hints. | |
852 | (concat "./" name))))) | |
853 | (buffer (get-file-buffer new-buffer-file-name)) | |
854 | (just-created nil)) | |
855 | (unless buffer | |
856 | (setq buffer (tar--extract descriptor)) | |
857 | (setq just-created t) | |
858 | (with-current-buffer buffer | |
859 | (goto-char (point-min)) | |
860 | (setq buffer-file-name new-buffer-file-name) | |
861 | (setq buffer-file-truename | |
862 | (abbreviate-file-name buffer-file-name)) | |
863 | ;; Force buffer-file-coding-system to what | |
864 | ;; decode-coding-region actually used. | |
865 | (set-buffer-file-coding-system last-coding-system-used t) | |
866 | ;; Set the default-directory to the dir of the | |
867 | ;; superior buffer. | |
868 | (setq default-directory | |
869 | (with-current-buffer tar-buffer | |
870 | default-directory)) | |
871 | (set-buffer-modified-p nil) | |
872 | (setq buffer-undo-list t) | |
873 | (normal-mode) ; pick a mode. | |
874 | (set (make-local-variable 'tar-superior-buffer) tar-buffer) | |
875 | (set (make-local-variable 'tar-superior-descriptor) descriptor) | |
876 | (setq buffer-read-only read-only-p) | |
877 | (tar-subfile-mode 1))) | |
878 | (cond | |
879 | (view-p | |
880 | (view-buffer buffer (and just-created 'kill-buffer-if-not-modified))) | |
881 | ((eq other-window-p 'display) (display-buffer buffer)) | |
882 | (other-window-p (switch-to-buffer-other-window buffer)) | |
883 | (t (switch-to-buffer buffer))))) | |
aa73f29c RS |
884 | |
885 | ||
886 | (defun tar-extract-other-window () | |
8560523d | 887 | "In Tar mode, find this entry of the tar file in another window." |
aa73f29c RS |
888 | (interactive) |
889 | (tar-extract t)) | |
890 | ||
e865c5ce | 891 | (defun tar-display-other-window () |
8560523d | 892 | "In Tar mode, display this entry of the tar file in another window." |
e865c5ce RS |
893 | (interactive) |
894 | (tar-extract 'display)) | |
895 | ||
aa73f29c | 896 | (defun tar-view () |
8560523d | 897 | "In Tar mode, view the tar file entry on this line." |
aa73f29c RS |
898 | (interactive) |
899 | (tar-extract 'view)) | |
900 | ||
901 | ||
902 | (defun tar-read-file-name (&optional prompt) | |
e865c5ce | 903 | "Read a file name with this line's entry as the default." |
aa73f29c RS |
904 | (or prompt (setq prompt "Copy to: ")) |
905 | (let* ((default-file (expand-file-name | |
61bb55d0 | 906 | (tar-header-name (tar-current-descriptor)))) |
aa73f29c RS |
907 | (target (expand-file-name |
908 | (read-file-name prompt | |
909 | (file-name-directory default-file) | |
910 | default-file nil)))) | |
911 | (if (or (string= "" (file-name-nondirectory target)) | |
912 | (file-directory-p target)) | |
913 | (setq target (concat (if (string-match "/$" target) | |
914 | (substring target 0 (1- (match-end 0))) | |
915 | target) | |
916 | "/" | |
917 | (file-name-nondirectory default-file)))) | |
918 | target)) | |
919 | ||
920 | ||
921 | (defun tar-copy (&optional to-file) | |
8560523d | 922 | "In Tar mode, extract this entry of the tar file into a file on disk. |
aa73f29c RS |
923 | If TO-FILE is not supplied, it is prompted for, defaulting to the name of |
924 | the current tar-entry." | |
925 | (interactive (list (tar-read-file-name))) | |
439fa06f | 926 | (let* ((descriptor (tar-get-descriptor)) |
61bb55d0 SM |
927 | (name (tar-header-name descriptor)) |
928 | (size (tar-header-size descriptor)) | |
929 | (start (tar-header-data-start descriptor)) | |
d4ec0200 RS |
930 | (end (+ start size)) |
931 | (inhibit-file-name-handlers inhibit-file-name-handlers) | |
932 | (inhibit-file-name-operation inhibit-file-name-operation)) | |
6960d7b9 CY |
933 | (with-current-buffer |
934 | (if (tar-data-swapped-p) tar-data-buffer (current-buffer)) | |
d4ec0200 RS |
935 | ;; Inhibit compressing a subfile again if *both* name and |
936 | ;; to-file are handled by jka-compr | |
6960d7b9 CY |
937 | (if (and (eq (find-file-name-handler name 'write-region) |
938 | 'jka-compr-handler) | |
939 | (eq (find-file-name-handler to-file 'write-region) | |
940 | 'jka-compr-handler)) | |
d4ec0200 RS |
941 | (setq inhibit-file-name-handlers |
942 | (cons 'jka-compr-handler | |
943 | (and (eq inhibit-file-name-operation 'write-region) | |
944 | inhibit-file-name-handlers)) | |
945 | inhibit-file-name-operation 'write-region)) | |
d26e6665 KH |
946 | (let ((coding-system-for-write 'no-conversion)) |
947 | (write-region start end to-file nil nil nil t))) | |
6a608e8e | 948 | (message "Copied tar entry %s to %s" name to-file))) |
aa73f29c RS |
949 | |
950 | (defun tar-flag-deleted (p &optional unflag) | |
8560523d | 951 | "In Tar mode, mark this sub-file to be deleted from the tar file. |
aa73f29c RS |
952 | With a prefix argument, mark that many files." |
953 | (interactive "p") | |
954 | (beginning-of-line) | |
8560523d | 955 | (dotimes (i (abs p)) |
aa73f29c RS |
956 | (if (tar-current-descriptor unflag) ; barf if we're not on an entry-line. |
957 | (progn | |
958 | (delete-char 1) | |
959 | (insert (if unflag " " "D")))) | |
960 | (forward-line (if (< p 0) -1 1))) | |
961 | (if (eobp) nil (forward-char 36))) | |
962 | ||
963 | (defun tar-unflag (p) | |
8560523d | 964 | "In Tar mode, un-mark this sub-file if it is marked to be deleted. |
aa73f29c RS |
965 | With a prefix argument, un-mark that many files forward." |
966 | (interactive "p") | |
967 | (tar-flag-deleted p t)) | |
968 | ||
969 | (defun tar-unflag-backwards (p) | |
8560523d | 970 | "In Tar mode, un-mark this sub-file if it is marked to be deleted. |
aa73f29c RS |
971 | With a prefix argument, un-mark that many files backward." |
972 | (interactive "p") | |
973 | (tar-flag-deleted (- p) t)) | |
974 | ||
975 | ||
976 | (defun tar-expunge-internal () | |
977 | "Expunge the tar-entry specified by the current line." | |
58d6a142 | 978 | (let ((descriptor (tar-current-descriptor))) |
aa73f29c RS |
979 | ;; |
980 | ;; delete the current line... | |
f598e45e | 981 | (delete-region (line-beginning-position) (line-beginning-position 2)) |
aa73f29c RS |
982 | ;; |
983 | ;; delete the data pointer... | |
984 | (setq tar-parse-info (delq descriptor tar-parse-info)) | |
985 | ;; | |
986 | ;; delete the data from inside the file... | |
58d6a142 SM |
987 | (with-current-buffer tar-data-buffer |
988 | (delete-region (or (tar-header-header-start descriptor) | |
989 | (- (tar-header-data-start descriptor) 512)) | |
990 | (tar-header-data-end descriptor))))) | |
aa73f29c RS |
991 | |
992 | ||
993 | (defun tar-expunge (&optional noconfirm) | |
8560523d | 994 | "In Tar mode, delete all the archived files flagged for deletion. |
aa73f29c RS |
995 | This does not modify the disk image; you must save the tar file itself |
996 | for this to be permanent." | |
997 | (interactive) | |
998 | (if (or noconfirm | |
67501c01 | 999 | (y-or-n-p "Expunge files marked for deletion? ")) |
d26e6665 | 1000 | (let ((n 0)) |
aa73f29c | 1001 | (save-excursion |
cb33a0ce | 1002 | (goto-char (point-min)) |
aa73f29c RS |
1003 | (while (not (eobp)) |
1004 | (if (looking-at "D") | |
1005 | (progn (tar-expunge-internal) | |
1006 | (setq n (1+ n))) | |
1007 | (forward-line 1))) | |
1008 | ;; after doing the deletions, add any padding that may be necessary. | |
f598e45e | 1009 | (tar-pad-to-blocksize)) |
aa73f29c | 1010 | (if (zerop n) |
67501c01 RS |
1011 | (message "Nothing to expunge.") |
1012 | (message "%s files expunged. Be sure to save this buffer." n))))) | |
aa73f29c RS |
1013 | |
1014 | ||
1015 | (defun tar-clear-modification-flags () | |
e865c5ce | 1016 | "Remove the stars at the beginning of each line." |
a7e5e8cb | 1017 | (interactive) |
aa73f29c | 1018 | (save-excursion |
cb33a0ce | 1019 | (goto-char (point-min)) |
f598e45e | 1020 | (while (not (eobp)) |
e5d56b61 | 1021 | (if (not (eq (following-char) ?\s)) |
aa73f29c RS |
1022 | (progn (delete-char 1) (insert " "))) |
1023 | (forward-line 1)))) | |
1024 | ||
1025 | ||
1026 | (defun tar-chown-entry (new-uid) | |
8560523d | 1027 | "Change the user-id associated with this entry in the tar file. |
aa73f29c RS |
1028 | If this tar file was written by GNU tar, then you will be able to edit |
1029 | the user id as a string; otherwise, you must edit it as a number. | |
1030 | You can force editing as a number by calling this with a prefix arg. | |
1031 | This does not modify the disk image; you must save the tar file itself | |
1032 | for this to be permanent." | |
61bb55d0 SM |
1033 | (interactive |
1034 | (list | |
1035 | (let ((descriptor (tar-current-descriptor))) | |
1036 | (if (or current-prefix-arg | |
1037 | (not (tar-header-magic descriptor))) | |
1038 | (read-number | |
1039 | "New UID number: " | |
1040 | (format "%s" (tar-header-uid descriptor))) | |
1041 | (read-string "New UID string: " (tar-header-uname descriptor)))))) | |
aa73f29c | 1042 | (cond ((stringp new-uid) |
61bb55d0 | 1043 | (setf (tar-header-uname (tar-current-descriptor)) new-uid) |
4062011e SM |
1044 | (tar-alter-one-field tar-uname-offset |
1045 | (concat (encode-coding-string | |
1046 | new-uid tar-file-name-coding-system) | |
1047 | "\000"))) | |
aa73f29c | 1048 | (t |
61bb55d0 | 1049 | (setf (tar-header-uid (tar-current-descriptor)) new-uid) |
aa73f29c RS |
1050 | (tar-alter-one-field tar-uid-offset |
1051 | (concat (substring (format "%6o" new-uid) 0 6) "\000 "))))) | |
1052 | ||
1053 | ||
1054 | (defun tar-chgrp-entry (new-gid) | |
8560523d | 1055 | "Change the group-id associated with this entry in the tar file. |
aa73f29c RS |
1056 | If this tar file was written by GNU tar, then you will be able to edit |
1057 | the group id as a string; otherwise, you must edit it as a number. | |
1058 | You can force editing as a number by calling this with a prefix arg. | |
1059 | This does not modify the disk image; you must save the tar file itself | |
1060 | for this to be permanent." | |
61bb55d0 SM |
1061 | (interactive |
1062 | (list | |
1063 | (let ((descriptor (tar-current-descriptor))) | |
1064 | (if (or current-prefix-arg | |
1065 | (not (tar-header-magic descriptor))) | |
1066 | (read-number | |
1067 | "New GID number: " | |
1068 | (format "%s" (tar-header-gid descriptor))) | |
1069 | (read-string "New GID string: " (tar-header-gname descriptor)))))) | |
aa73f29c | 1070 | (cond ((stringp new-gid) |
61bb55d0 | 1071 | (setf (tar-header-gname (tar-current-descriptor)) new-gid) |
aa73f29c | 1072 | (tar-alter-one-field tar-gname-offset |
4062011e SM |
1073 | (concat (encode-coding-string |
1074 | new-gid tar-file-name-coding-system) | |
1075 | "\000"))) | |
aa73f29c | 1076 | (t |
61bb55d0 | 1077 | (setf (tar-header-gid (tar-current-descriptor)) new-gid) |
aa73f29c RS |
1078 | (tar-alter-one-field tar-gid-offset |
1079 | (concat (substring (format "%6o" new-gid) 0 6) "\000 "))))) | |
1080 | ||
1081 | (defun tar-rename-entry (new-name) | |
8560523d | 1082 | "Change the name associated with this entry in the tar file. |
aa73f29c RS |
1083 | This does not modify the disk image; you must save the tar file itself |
1084 | for this to be permanent." | |
1085 | (interactive | |
1086 | (list (read-string "New name: " | |
61bb55d0 | 1087 | (tar-header-name (tar-current-descriptor))))) |
439fa06f | 1088 | (if (string= "" new-name) (error "zero length name")) |
d26e6665 | 1089 | (let ((encoded-new-name (encode-coding-string new-name |
58d6a142 SM |
1090 | tar-file-name-coding-system)) |
1091 | (descriptor (tar-current-descriptor)) | |
1092 | (prefix nil)) | |
1093 | (when (tar-header-header-start descriptor) | |
1094 | ;; FIXME: Make it work for ././@LongLink. | |
1095 | (error "Rename with @LongLink format is not implemented")) | |
1096 | ||
1097 | (when (and (> (length encoded-new-name) 98) | |
1098 | (string-match "/" encoded-new-name | |
1099 | (- (length encoded-new-name) 99)) | |
1100 | (< (match-beginning 0) 155)) | |
b6388cc9 SM |
1101 | (unless (equal (tar-header-magic descriptor) "ustar\0") |
1102 | (tar-alter-one-field tar-magic-offset (concat "ustar\0" "00"))) | |
58d6a142 SM |
1103 | (setq prefix (substring encoded-new-name 0 (match-beginning 0))) |
1104 | (setq encoded-new-name (substring encoded-new-name (match-end 0)))) | |
1105 | ||
d26e6665 | 1106 | (if (> (length encoded-new-name) 98) (error "name too long")) |
58d6a142 | 1107 | (setf (tar-header-name descriptor) new-name) |
d26e6665 | 1108 | (tar-alter-one-field 0 |
58d6a142 SM |
1109 | (substring (concat encoded-new-name (make-string 99 0)) 0 99)) |
1110 | (if prefix | |
1111 | (tar-alter-one-field tar-prefix-offset | |
1112 | (substring (concat prefix (make-string 155 0)) 0 155))))) | |
aa73f29c RS |
1113 | |
1114 | ||
1115 | (defun tar-chmod-entry (new-mode) | |
c40d3365 | 1116 | "Change the protection bits associated with this entry in the tar file. |
aa73f29c RS |
1117 | This does not modify the disk image; you must save the tar file itself |
1118 | for this to be permanent." | |
1119 | (interactive (list (tar-parse-octal-integer-safe | |
1120 | (read-string "New protection (octal): ")))) | |
61bb55d0 | 1121 | (setf (tar-header-mode (tar-current-descriptor)) new-mode) |
aa73f29c RS |
1122 | (tar-alter-one-field tar-mode-offset |
1123 | (concat (substring (format "%6o" new-mode) 0 6) "\000 "))) | |
1124 | ||
1125 | ||
58d6a142 SM |
1126 | (defun tar-alter-one-field (data-position new-data-string &optional descriptor) |
1127 | (unless descriptor (setq descriptor (tar-current-descriptor))) | |
1128 | ;; | |
1129 | ;; update the header-line. | |
1130 | (let ((col (current-column))) | |
1131 | (delete-region (line-beginning-position) | |
1132 | (prog2 (forward-line 1) | |
1133 | (point) | |
1134 | ;; Insert the new text after the old, before deleting, | |
1135 | ;; to preserve markers such as the window start. | |
1136 | (insert (tar-header-block-summarize descriptor) "\n"))) | |
1137 | (forward-line -1) (move-to-column col)) | |
f598e45e | 1138 | |
a464a6c7 | 1139 | (cl-assert (tar-data-swapped-p)) |
58d6a142 SM |
1140 | (with-current-buffer tar-data-buffer |
1141 | (let* ((start (- (tar-header-data-start descriptor) 512))) | |
f598e45e SM |
1142 | ;; |
1143 | ;; delete the old field and insert a new one. | |
1144 | (goto-char (+ start data-position)) | |
1145 | (delete-region (point) (+ (point) (length new-data-string))) ; <-- | |
a464a6c7 SM |
1146 | (cl-assert (not (or enable-multibyte-characters |
1147 | (multibyte-string-p new-data-string)))) | |
f598e45e SM |
1148 | (insert new-data-string) |
1149 | ;; | |
1150 | ;; compute a new checksum and insert it. | |
1151 | (let ((chk (tar-header-block-checksum | |
58d6a142 SM |
1152 | (buffer-substring start (+ start 512))))) |
1153 | (goto-char (+ start tar-chk-offset)) | |
1154 | (delete-region (point) (+ (point) 8)) | |
1155 | (insert (format "%6o\0 " chk)) | |
1156 | (setf (tar-header-checksum descriptor) chk) | |
1157 | ;; | |
1158 | ;; ok, make sure we didn't botch it. | |
1159 | (tar-header-block-check-checksum | |
1160 | (buffer-substring start (+ start 512)) | |
1161 | chk (tar-header-name descriptor)) | |
1162 | )))) | |
aa73f29c RS |
1163 | |
1164 | ||
3d7fc2fb ER |
1165 | (defun tar-octal-time (timeval) |
1166 | ;; Format a timestamp as 11 octal digits. Ghod, I hope this works... | |
1167 | (let ((hibits (car timeval)) (lobits (car (cdr timeval)))) | |
516f7fca EZ |
1168 | (format "%05o%01o%05o" |
1169 | (lsh hibits -2) | |
1170 | (logior (lsh (logand 3 hibits) 1) | |
1171 | (if (> (logand lobits 32768) 0) 1 0)) | |
1172 | (logand 32767 lobits) | |
1173 | ))) | |
3d7fc2fb | 1174 | |
aa73f29c | 1175 | (defun tar-subfile-save-buffer () |
e865c5ce RS |
1176 | "In tar subfile mode, save this buffer into its parent tar-file buffer. |
1177 | This doesn't write anything to disk; you must save the parent tar-file buffer | |
aa73f29c RS |
1178 | to make your changes permanent." |
1179 | (interactive) | |
0f8becaa | 1180 | (if (not (and (boundp 'tar-superior-buffer) tar-superior-buffer)) |
f598e45e | 1181 | (error "This buffer has no superior tar file buffer")) |
0f8becaa | 1182 | (if (not (and (boundp 'tar-superior-descriptor) tar-superior-descriptor)) |
f598e45e | 1183 | (error "This buffer doesn't have an index into its superior tar file!")) |
aa73f29c | 1184 | (let ((subfile (current-buffer)) |
f598e45e SM |
1185 | (coding buffer-file-coding-system) |
1186 | (descriptor tar-superior-descriptor) | |
1187 | subfile-size) | |
1188 | (with-current-buffer tar-superior-buffer | |
61bb55d0 | 1189 | (let* ((start (tar-header-data-start descriptor)) |
61bb55d0 | 1190 | (size (tar-header-size descriptor)) |
dd798c64 | 1191 | (head (memq descriptor tar-parse-info))) |
f598e45e SM |
1192 | (if (not head) |
1193 | (error "Can't find this tar file entry in its parent tar file!")) | |
1194 | (with-current-buffer tar-data-buffer | |
1195 | ;; delete the old data... | |
1196 | (let* ((data-start start) | |
61bb55d0 | 1197 | (data-end (+ data-start (tar-roundup-512 size)))) |
f598e45e SM |
1198 | (narrow-to-region data-start data-end) |
1199 | (delete-region (point-min) (point-max)) | |
1200 | ;; insert the new data... | |
1201 | (goto-char data-start) | |
1202 | (let ((dest (current-buffer))) | |
1203 | (with-current-buffer subfile | |
1204 | (save-restriction | |
1205 | (widen) | |
1206 | (encode-coding-region (point-min) (point-max) coding dest)))) | |
1207 | (setq subfile-size (- (point-max) (point-min))) | |
1208 | ;; | |
1209 | ;; pad the new data out to a multiple of 512... | |
61bb55d0 | 1210 | (let ((subfile-size-pad (tar-roundup-512 subfile-size))) |
f598e45e SM |
1211 | (goto-char (point-max)) |
1212 | (insert (make-string (- subfile-size-pad subfile-size) 0)) | |
1213 | ;; | |
61bb55d0 SM |
1214 | ;; update the data of this files... |
1215 | (setf (tar-header-size descriptor) subfile-size) | |
f598e45e SM |
1216 | ;; |
1217 | ;; Update the size field in the header block. | |
58d6a142 | 1218 | (widen)))) |
f598e45e | 1219 | ;; |
58d6a142 | 1220 | ;; alter the descriptor-line and header |
f598e45e SM |
1221 | ;; |
1222 | (let ((position (- (length tar-parse-info) (length head)))) | |
1223 | (goto-char (point-min)) | |
1224 | (forward-line position) | |
58d6a142 SM |
1225 | (tar-alter-one-field tar-size-offset (format "%11o " subfile-size)) |
1226 | ;; | |
1227 | ;; Maybe update the datestamp. | |
1228 | (when tar-update-datestamp | |
1229 | (tar-alter-one-field tar-time-offset | |
1230 | (concat (tar-octal-time (current-time)) " ")))) | |
f598e45e SM |
1231 | ;; After doing the insertion, add any necessary final padding. |
1232 | (tar-pad-to-blocksize)) | |
1233 | (set-buffer-modified-p t) ; mark the tar file as modified | |
1234 | (tar-next-line 0)) | |
1235 | (set-buffer-modified-p nil) ; mark the tar subfile as unmodified | |
67501c01 | 1236 | (message "Saved into tar-buffer `%s'. Be sure to save that buffer!" |
f598e45e | 1237 | (buffer-name tar-superior-buffer)) |
47414bc1 RS |
1238 | ;; Prevent basic-save-buffer from changing our coding-system. |
1239 | (setq last-coding-system-used buffer-file-coding-system) | |
e865c5ce | 1240 | ;; Prevent ordinary saving from happening. |
f598e45e | 1241 | t)) |
aa73f29c RS |
1242 | |
1243 | ||
1b33e237 | 1244 | ;; When this function is called, it is sure that the buffer is unibyte. |
aa73f29c RS |
1245 | (defun tar-pad-to-blocksize () |
1246 | "If we are being anal about tar file blocksizes, fix up the current buffer. | |
1247 | Leaves the region wide." | |
1248 | (if (null tar-anal-blocksize) | |
1249 | nil | |
aa73f29c | 1250 | (let* ((last-desc (nth (1- (length tar-parse-info)) tar-parse-info)) |
61bb55d0 SM |
1251 | (start (tar-header-data-start last-desc)) |
1252 | (link-p (tar-header-link-type last-desc)) | |
1253 | (size (if link-p 0 (tar-header-size last-desc))) | |
aa73f29c RS |
1254 | (data-end (+ start size)) |
1255 | (bbytes (ash tar-anal-blocksize 9)) | |
f598e45e | 1256 | (pad-to (+ bbytes (* bbytes (/ (- data-end (point-min)) bbytes))))) |
aa73f29c RS |
1257 | ;; If the padding after the last data is too long, delete some; |
1258 | ;; else insert some until we are padded out to the right number of blocks. | |
1259 | ;; | |
f598e45e SM |
1260 | (with-current-buffer tar-data-buffer |
1261 | (let ((goal-end (+ (point-min) pad-to))) | |
1262 | (if (> (point-max) goal-end) | |
1263 | (delete-region goal-end (point-max)) | |
1264 | (goto-char (point-max)) | |
1265 | (insert (make-string (- goal-end (point-max)) ?\0)))))))) | |
19eb68d0 SM |
1266 | |
1267 | ||
3006c8dc | 1268 | ;; Used in write-region-annotate-functions to write tar-files out correctly. |
06b60517 | 1269 | (defun tar-write-region-annotate (start _end) |
3006c8dc SM |
1270 | ;; When called from write-file (and auto-save), `start' is nil. |
1271 | ;; When called from M-x write-region, we assume the user wants to save | |
1272 | ;; (part of) the summary, not the tar data. | |
1273 | (unless (or start (not (tar-data-swapped-p))) | |
d00da9d7 | 1274 | (tar-clear-modification-flags) |
3006c8dc SM |
1275 | (set-buffer tar-data-buffer) |
1276 | nil)) | |
19eb68d0 | 1277 | |
aa73f29c RS |
1278 | (provide 'tar-mode) |
1279 | ||
c88ab9ce | 1280 | ;;; tar-mode.el ends here |