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be010748 RS |
1 | ;;; jka-compr.el --- reading/writing/loading compressed files |
2 | ||
c90f2757 | 3 | ;; Copyright (C) 1993, 1994, 1995, 1997, 1999, 2000, 2001, 2002, 2003, |
409cc4a3 | 4 | ;; 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc. |
acd622cc RS |
5 | |
6 | ;; Author: jka@ece.cmu.edu (Jay K. Adams) | |
4228277d | 7 | ;; Maintainer: FSF |
acd622cc RS |
8 | ;; Keywords: data |
9 | ||
f4454a14 RS |
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 | |
b4aa6026 | 14 | ;; the Free Software Foundation; either version 3, or (at your option) |
f4454a14 RS |
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 | |
b578f267 | 23 | ;; along with GNU Emacs; see the file COPYING. If not, write to the |
086add15 LK |
24 | ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
25 | ;; Boston, MA 02110-1301, USA. | |
f4454a14 | 26 | |
55535639 | 27 | ;;; Commentary: |
acd622cc | 28 | |
b578f267 EN |
29 | ;; This package implements low-level support for reading, writing, |
30 | ;; and loading compressed files. It hooks into the low-level file | |
31 | ;; I/O functions (including write-region and insert-file-contents) so | |
32 | ;; that they automatically compress or uncompress a file if the file | |
33 | ;; appears to need it (based on the extension of the file name). | |
34 | ;; Packages like Rmail, VM, GNUS, and Info should be able to work | |
35 | ;; with compressed files without modification. | |
36 | ||
37 | ||
38 | ;; INSTRUCTIONS: | |
39 | ;; | |
7391213d MB |
40 | ;; To use jka-compr, invoke the command `auto-compression-mode' (which |
41 | ;; see), or customize the variable of the same name. Its operation | |
42 | ;; should be transparent to the user (except for messages appearing when | |
43 | ;; a file is being compressed or uncompressed). | |
b578f267 EN |
44 | ;; |
45 | ;; The variable, jka-compr-compression-info-list can be used to | |
46 | ;; customize jka-compr to work with other compression programs. | |
47 | ;; The default value of this variable allows jka-compr to work with | |
48 | ;; Unix compress and gzip. | |
49 | ;; | |
b578f267 | 50 | ;; If you don't want messages about compressing and decompressing |
04b5376f JB |
51 | ;; to show up in the echo area, you can set the compress-msg and |
52 | ;; decompress-msg fields of the jka-compr-compression-info-list to | |
b578f267 EN |
53 | ;; nil. |
54 | ||
55 | ||
56 | ;; APPLICATION NOTES: | |
57 | ;; | |
58 | ;; crypt++ | |
5f320490 | 59 | ;; jka-compr can coexist with crypt++ if you take all the decompression |
b578f267 EN |
60 | ;; entries out of the crypt-encoding-list. Clearly problems will arise if |
61 | ;; you have two programs trying to compress/decompress files. jka-compr | |
62 | ;; will not "work with" crypt++ in the following sense: you won't be able to | |
63 | ;; decode encrypted compressed files--that is, files that have been | |
64 | ;; compressed then encrypted (in that order). Theoretically, crypt++ and | |
65 | ;; jka-compr could properly handle a file that has been encrypted then | |
66 | ;; compressed, but there is little point in trying to compress an encrypted | |
67 | ;; file. | |
68 | ;; | |
69 | ||
70 | ||
71 | ;; ACKNOWLEDGMENTS | |
f1180544 | 72 | ;; |
b578f267 | 73 | ;; jka-compr is a V19 adaptation of jka-compr for V18 of Emacs. Many people |
f1180544 | 74 | ;; have made helpful suggestions, reported bugs, and even fixed bugs in |
b578f267 EN |
75 | ;; jka-compr. I recall the following people as being particularly helpful. |
76 | ;; | |
77 | ;; Jean-loup Gailly | |
78 | ;; David Hughes | |
79 | ;; Richard Pieri | |
80 | ;; Daniel Quinlan | |
81 | ;; Chris P. Ross | |
82 | ;; Rick Sladkey | |
83 | ;; | |
84 | ;; Andy Norman's ange-ftp was the inspiration for the original jka-compr for | |
85 | ;; Version 18 of Emacs. | |
86 | ;; | |
87 | ;; After I had made progress on the original jka-compr for V18, I learned of a | |
88 | ;; package written by Kazushi Jam Marukawa, called jam-zcat, that did exactly | |
89 | ;; what I was trying to do. I looked over the jam-zcat source code and | |
90 | ;; probably got some ideas from it. | |
91 | ;; | |
acd622cc RS |
92 | |
93 | ;;; Code: | |
94 | ||
f6cb7e0a SM |
95 | (require 'jka-cmpr-hook) |
96 | ||
bbf5eb28 | 97 | (defcustom jka-compr-shell "sh" |
acd622cc | 98 | "*Shell to be used for calling compression programs. |
04b5376f | 99 | NOTE: Not used in MS-DOS and Windows systems." |
bbf5eb28 RS |
100 | :type 'string |
101 | :group 'jka-compr) | |
acd622cc | 102 | |
f1180544 | 103 | (defvar jka-compr-use-shell |
eb915452 | 104 | (not (memq system-type '(ms-dos windows-nt)))) |
acd622cc | 105 | |
e073a356 | 106 | (defvar jka-compr-really-do-compress nil |
dd83d95a RS |
107 | "Non-nil in a buffer whose visited file was uncompressed on visiting it. |
108 | This means compress the data on writing the file, even if the | |
109 | data appears to be compressed already.") | |
110 | (make-variable-buffer-local 'jka-compr-really-do-compress) | |
e073a356 | 111 | (put 'jka-compr-really-do-compress 'permanent-local t) |
555235e6 | 112 | \f |
acd622cc RS |
113 | |
114 | (put 'compression-error 'error-conditions '(compression-error file-error error)) | |
115 | ||
116 | ||
30c78e11 | 117 | (defvar jka-compr-acceptable-retval-list '(0 2 141)) |
acd622cc RS |
118 | |
119 | ||
120 | (defun jka-compr-error (prog args infile message &optional errfile) | |
121 | ||
f6cb7e0a | 122 | (let ((errbuf (get-buffer-create " *jka-compr-error*"))) |
75e9c107 RS |
123 | (with-current-buffer errbuf |
124 | (widen) (erase-buffer) | |
125 | (insert (format "Error while executing \"%s %s < %s\"\n\n" | |
126 | prog | |
127 | (mapconcat 'identity args " ") | |
128 | infile)) | |
129 | ||
130 | (and errfile | |
131 | (insert-file-contents errfile))) | |
acd622cc RS |
132 | (display-buffer errbuf)) |
133 | ||
75e9c107 RS |
134 | (signal 'compression-error |
135 | (list "Opening input file" (format "error %s" message) infile))) | |
f1180544 JB |
136 | |
137 | ||
242d2673 RS |
138 | (defcustom jka-compr-dd-program "/bin/dd" |
139 | "How to invoke `dd'." | |
140 | :type 'string | |
141 | :group 'jka-compr) | |
acd622cc RS |
142 | |
143 | ||
dfe05fac | 144 | (defvar jka-compr-dd-blocksize 256) |
acd622cc RS |
145 | |
146 | ||
147 | (defun jka-compr-partial-uncompress (prog message args infile beg len) | |
148 | "Call program PROG with ARGS args taking input from INFILE. | |
149 | Fourth and fifth args, BEG and LEN, specify which part of the output | |
ee139ed3 | 150 | to keep: LEN chars starting BEG chars from the beginning." |
242d2673 RS |
151 | (let ((start (point)) |
152 | (prefix beg)) | |
153 | (if (and jka-compr-use-shell jka-compr-dd-program) | |
154 | ;; Put the uncompression output through dd | |
155 | ;; to discard the part we don't want. | |
156 | (let ((skip (/ beg jka-compr-dd-blocksize)) | |
157 | (err-file (jka-compr-make-temp-name)) | |
dc2cef77 CY |
158 | ;; call-process barfs if default-directory is inaccessible. |
159 | (default-directory | |
160 | (if (and default-directory | |
161 | (file-accessible-directory-p default-directory)) | |
162 | default-directory | |
163 | (file-name-directory infile))) | |
242d2673 RS |
164 | count) |
165 | ;; Update PREFIX based on the text that we won't read in. | |
166 | (setq prefix (- beg (* skip jka-compr-dd-blocksize)) | |
167 | count (and len (1+ (/ (+ len prefix) jka-compr-dd-blocksize)))) | |
168 | (unwind-protect | |
169 | (or (memq (call-process | |
170 | jka-compr-shell infile t nil "-c" | |
171 | (format | |
152e2693 | 172 | "%s %s 2> %s | %s bs=%d skip=%d %s 2> %s" |
242d2673 RS |
173 | prog |
174 | (mapconcat 'identity args " ") | |
175 | err-file | |
176 | jka-compr-dd-program | |
177 | jka-compr-dd-blocksize | |
178 | skip | |
179 | ;; dd seems to be unreliable about | |
180 | ;; providing the last block. So, always | |
181 | ;; read one more than you think you need. | |
152e2693 EZ |
182 | (if count (format "count=%d" (1+ count)) "") |
183 | null-device)) | |
242d2673 RS |
184 | jka-compr-acceptable-retval-list) |
185 | (jka-compr-error prog args infile message err-file)) | |
186 | (jka-compr-delete-temp-file err-file))) | |
187 | ;; Run the uncompression program directly. | |
188 | ;; We get the whole file and must delete what we don't want. | |
189 | (jka-compr-call-process prog message infile t nil args)) | |
acd622cc | 190 | |
ee139ed3 | 191 | ;; Delete the stuff after what we want, if there is any. |
acd622cc | 192 | (and |
dfe05fac | 193 | len |
ee139ed3 | 194 | (< (+ start prefix len) (point)) |
dfe05fac | 195 | (delete-region (+ start prefix len) (point))) |
acd622cc | 196 | |
ee139ed3 | 197 | ;; Delete the stuff before what we want. |
acd622cc RS |
198 | (delete-region start (+ start prefix)))) |
199 | ||
200 | ||
201 | (defun jka-compr-call-process (prog message infile output temp args) | |
dc2cef77 CY |
202 | ;; call-process barfs if default-directory is inaccessible. |
203 | (let ((default-directory | |
204 | (if (and default-directory | |
205 | (file-accessible-directory-p default-directory)) | |
206 | default-directory | |
207 | (file-name-directory infile)))) | |
208 | (if jka-compr-use-shell | |
209 | (let ((err-file (jka-compr-make-temp-name)) | |
210 | (coding-system-for-read (or coding-system-for-read 'undecided)) | |
211 | (coding-system-for-write 'no-conversion)) | |
212 | (unwind-protect | |
213 | (or (memq | |
214 | (call-process jka-compr-shell infile | |
215 | (if (stringp output) nil output) | |
216 | nil | |
217 | "-c" | |
218 | (format "%s %s 2> %s %s" | |
219 | prog | |
220 | (mapconcat 'identity args " ") | |
221 | err-file | |
222 | (if (stringp output) | |
223 | (concat "> " output) | |
224 | ""))) | |
225 | jka-compr-acceptable-retval-list) | |
226 | (jka-compr-error prog args infile message err-file)) | |
227 | (jka-compr-delete-temp-file err-file))) | |
228 | (or (eq 0 | |
229 | (apply 'call-process | |
230 | prog infile (if (stringp output) temp output) | |
231 | nil args)) | |
232 | (jka-compr-error prog args infile message)) | |
233 | (and (stringp output) | |
234 | (with-current-buffer temp | |
235 | (write-region (point-min) (point-max) output) | |
236 | (erase-buffer)))))) | |
acd622cc RS |
237 | |
238 | ||
f6cb7e0a SM |
239 | ;; Support for temp files. Much of this was inspired if not lifted |
240 | ;; from ange-ftp. | |
acd622cc | 241 | |
bbf5eb28 | 242 | (defcustom jka-compr-temp-name-template |
11757e2f | 243 | (expand-file-name "jka-com" temporary-file-directory) |
362b539a | 244 | "Prefix added to all temp files created by jka-compr. |
bbf5eb28 RS |
245 | There should be no more than seven characters after the final `/'." |
246 | :type 'string | |
247 | :group 'jka-compr) | |
acd622cc | 248 | |
acd622cc RS |
249 | (defun jka-compr-make-temp-name (&optional local-copy) |
250 | "This routine will return the name of a new file." | |
767d12f2 SM |
251 | (make-temp-file jka-compr-temp-name-template)) |
252 | ||
253 | (defalias 'jka-compr-delete-temp-file 'delete-file) | |
acd622cc RS |
254 | |
255 | ||
256 | (defun jka-compr-write-region (start end file &optional append visit) | |
acd622cc RS |
257 | (let* ((filename (expand-file-name file)) |
258 | (visit-file (if (stringp visit) (expand-file-name visit) filename)) | |
e073a356 RS |
259 | (info (jka-compr-get-compression-info visit-file)) |
260 | (magic (and info (jka-compr-info-file-magic-bytes info)))) | |
261 | ||
b6e8d238 RS |
262 | ;; If START is nil, use the whole buffer. |
263 | (if (null start) | |
264 | (setq start 1 end (1+ (buffer-size)))) | |
265 | ||
e073a356 RS |
266 | ;; If we uncompressed this file when visiting it, |
267 | ;; then recompress it when writing it | |
268 | ;; even if the contents look compressed already. | |
269 | (if (and jka-compr-really-do-compress | |
270 | (eq start 1) | |
271 | (eq end (1+ (buffer-size)))) | |
272 | (setq magic nil)) | |
273 | ||
274 | (if (and info | |
275 | ;; If the contents to be written out | |
276 | ;; are properly compressed already, | |
277 | ;; don't try to compress them over again. | |
278 | (not (and magic | |
279 | (equal (if (stringp start) | |
280 | (substring start 0 (min (length start) | |
281 | (length magic))) | |
282 | (buffer-substring start | |
283 | (min end | |
284 | (+ start (length magic))))) | |
285 | magic)))) | |
286 | (let ((can-append (jka-compr-info-can-append info)) | |
287 | (compress-program (jka-compr-info-compress-program info)) | |
288 | (compress-message (jka-compr-info-compress-message info)) | |
e073a356 | 289 | (compress-args (jka-compr-info-compress-args info)) |
e073a356 RS |
290 | (base-name (file-name-nondirectory visit-file)) |
291 | temp-file temp-buffer | |
292 | ;; we need to leave `last-coding-system-used' set to its | |
293 | ;; value after calling write-region the first time, so | |
294 | ;; that `basic-save-buffer' sees the right value. | |
295 | (coding-system-used last-coding-system-used)) | |
296 | ||
cc8b577e JL |
297 | (or compress-program |
298 | (error "No compression program defined")) | |
299 | ||
e073a356 RS |
300 | (setq temp-buffer (get-buffer-create " *jka-compr-wr-temp*")) |
301 | (with-current-buffer temp-buffer | |
302 | (widen) (erase-buffer)) | |
303 | ||
304 | (if (and append | |
305 | (not can-append) | |
306 | (file-exists-p filename)) | |
307 | ||
308 | (let* ((local-copy (file-local-copy filename)) | |
309 | (local-file (or local-copy filename))) | |
310 | ||
311 | (setq temp-file local-file)) | |
312 | ||
313 | (setq temp-file (jka-compr-make-temp-name))) | |
314 | ||
f1180544 | 315 | (and |
e073a356 RS |
316 | compress-message |
317 | (message "%s %s..." compress-message base-name)) | |
318 | ||
319 | (jka-compr-run-real-handler 'write-region | |
320 | (list start end temp-file t 'dont)) | |
321 | ;; save value used by the real write-region | |
322 | (setq coding-system-used last-coding-system-used) | |
323 | ||
324 | ;; Here we must read the output of compress program as is | |
325 | ;; without any code conversion. | |
326 | (let ((coding-system-for-read 'no-conversion)) | |
327 | (jka-compr-call-process compress-program | |
328 | (concat compress-message | |
329 | " " base-name) | |
330 | temp-file | |
331 | temp-buffer | |
332 | nil | |
333 | compress-args)) | |
334 | ||
335 | (with-current-buffer temp-buffer | |
336 | (let ((coding-system-for-write 'no-conversion)) | |
337 | (if (memq system-type '(ms-dos windows-nt)) | |
338 | (setq buffer-file-type t) ) | |
339 | (jka-compr-run-real-handler 'write-region | |
340 | (list (point-min) (point-max) | |
341 | filename | |
342 | (and append can-append) 'dont)) | |
343 | (erase-buffer)) ) | |
344 | ||
345 | (jka-compr-delete-temp-file temp-file) | |
acd622cc | 346 | |
e073a356 RS |
347 | (and |
348 | compress-message | |
349 | (message "%s %s...done" compress-message base-name)) | |
350 | ||
351 | (cond | |
352 | ((eq visit t) | |
353 | (setq buffer-file-name filename) | |
354 | (setq jka-compr-really-do-compress t) | |
355 | (set-visited-file-modtime)) | |
356 | ((stringp visit) | |
357 | (setq buffer-file-name visit) | |
358 | (let ((buffer-file-name filename)) | |
359 | (set-visited-file-modtime)))) | |
360 | ||
361 | (and (or (eq visit t) | |
362 | (eq visit nil) | |
363 | (stringp visit)) | |
364 | (message "Wrote %s" visit-file)) | |
365 | ||
366 | ;; ensure `last-coding-system-used' has an appropriate value | |
367 | (setq last-coding-system-used coding-system-used) | |
368 | ||
369 | nil) | |
f1180544 | 370 | |
e073a356 RS |
371 | (jka-compr-run-real-handler 'write-region |
372 | (list start end filename append visit))))) | |
acd622cc RS |
373 | |
374 | ||
54b2aa5c | 375 | (defun jka-compr-insert-file-contents (file &optional visit beg end replace) |
acd622cc RS |
376 | (barf-if-buffer-read-only) |
377 | ||
378 | (and (or beg end) | |
379 | visit | |
380 | (error "Attempt to visit less than an entire file")) | |
381 | ||
382 | (let* ((filename (expand-file-name file)) | |
383 | (info (jka-compr-get-compression-info filename))) | |
384 | ||
82fb0b42 SM |
385 | (if (not info) |
386 | ||
387 | (jka-compr-run-real-handler 'insert-file-contents | |
388 | (list file visit beg end replace)) | |
389 | ||
390 | (let ((uncompress-message (jka-compr-info-uncompress-message info)) | |
391 | (uncompress-program (jka-compr-info-uncompress-program info)) | |
392 | (uncompress-args (jka-compr-info-uncompress-args info)) | |
393 | (base-name (file-name-nondirectory filename)) | |
394 | (notfound nil) | |
395 | (local-copy | |
396 | (jka-compr-run-real-handler 'file-local-copy (list filename))) | |
397 | local-file | |
398 | size start) | |
399 | ||
400 | (setq local-file (or local-copy filename)) | |
401 | ||
402 | (and | |
403 | visit | |
404 | (setq buffer-file-name filename)) | |
405 | ||
406 | (unwind-protect ; to make sure local-copy gets deleted | |
407 | ||
408 | (progn | |
409 | ||
410 | (and | |
411 | uncompress-message | |
412 | (message "%s %s..." uncompress-message base-name)) | |
413 | ||
414 | (condition-case error-code | |
415 | ||
416 | (let ((coding-system-for-read 'no-conversion)) | |
417 | (if replace | |
418 | (goto-char (point-min))) | |
419 | (setq start (point)) | |
420 | (if (or beg end) | |
421 | (jka-compr-partial-uncompress uncompress-program | |
422 | (concat uncompress-message | |
423 | " " base-name) | |
424 | uncompress-args | |
425 | local-file | |
426 | (or beg 0) | |
427 | (if (and beg end) | |
428 | (- end beg) | |
429 | end)) | |
430 | ;; If visiting, bind off buffer-file-name so that | |
431 | ;; file-locking will not ask whether we should | |
432 | ;; really edit the buffer. | |
433 | (let ((buffer-file-name | |
434 | (if visit nil buffer-file-name))) | |
435 | (jka-compr-call-process uncompress-program | |
436 | (concat uncompress-message | |
437 | " " base-name) | |
438 | local-file | |
439 | t | |
440 | nil | |
441 | uncompress-args))) | |
442 | (setq size (- (point) start)) | |
443 | (if replace | |
444 | (delete-region (point) (point-max))) | |
445 | (goto-char start)) | |
446 | (error | |
447 | ;; If the file we wanted to uncompress does not exist, | |
448 | ;; handle that according to VISIT as `insert-file-contents' | |
449 | ;; would, maybe signaling the same error it normally would. | |
450 | (if (and (eq (car error-code) 'file-error) | |
451 | (eq (nth 3 error-code) local-file)) | |
452 | (if visit | |
453 | (setq notfound error-code) | |
454 | (signal 'file-error | |
455 | (cons "Opening input file" | |
456 | (nthcdr 2 error-code)))) | |
457 | ;; If the uncompression program can't be found, | |
458 | ;; signal that as a non-file error | |
459 | ;; so that find-file-noselect-1 won't handle it. | |
460 | (if (and (eq (car error-code) 'file-error) | |
461 | (equal (cadr error-code) "Searching for program")) | |
462 | (error "Uncompression program `%s' not found" | |
463 | (nth 3 error-code))) | |
464 | (signal (car error-code) (cdr error-code)))))) | |
465 | ||
466 | (and | |
467 | local-copy | |
468 | (file-exists-p local-copy) | |
469 | (delete-file local-copy))) | |
470 | ||
471 | (unless notfound | |
472 | (decode-coding-inserted-region | |
473 | (point) (+ (point) size) | |
474 | (jka-compr-byte-compiler-base-file-name file) | |
475 | visit beg end replace)) | |
476 | ||
477 | (and | |
478 | visit | |
479 | (progn | |
480 | (unlock-buffer) | |
481 | (setq buffer-file-name filename) | |
482 | (setq jka-compr-really-do-compress t) | |
483 | (set-visited-file-modtime))) | |
484 | ||
485 | (and | |
486 | uncompress-message | |
487 | (message "%s %s...done" uncompress-message base-name)) | |
488 | ||
489 | (and | |
490 | visit | |
491 | notfound | |
492 | (signal 'file-error | |
493 | (cons "Opening input file" (nth 2 notfound)))) | |
494 | ||
495 | ;; This is done in insert-file-contents after we return. | |
496 | ;; That is a little weird, but better to go along with it now | |
497 | ;; than to change it now. | |
498 | ||
499 | ;; ;; Run the functions that insert-file-contents would. | |
500 | ;; (let ((p after-insert-file-functions) | |
501 | ;; (insval size)) | |
502 | ;; (while p | |
503 | ;; (setq insval (funcall (car p) size)) | |
504 | ;; (if insval | |
505 | ;; (progn | |
506 | ;; (or (integerp insval) | |
507 | ;; (signal 'wrong-type-argument | |
508 | ;; (list 'integerp insval))) | |
509 | ;; (setq size insval))) | |
510 | ;; (setq p (cdr p)))) | |
511 | ||
512 | (or (jka-compr-info-compress-program info) | |
513 | (message "You can't save this buffer because compression program is not defined")) | |
514 | ||
515 | (list filename size))))) | |
acd622cc RS |
516 | |
517 | ||
518 | (defun jka-compr-file-local-copy (file) | |
acd622cc RS |
519 | (let* ((filename (expand-file-name file)) |
520 | (info (jka-compr-get-compression-info filename))) | |
521 | ||
522 | (if info | |
523 | ||
524 | (let ((uncompress-message (jka-compr-info-uncompress-message info)) | |
525 | (uncompress-program (jka-compr-info-uncompress-program info)) | |
526 | (uncompress-args (jka-compr-info-uncompress-args info)) | |
527 | (base-name (file-name-nondirectory filename)) | |
8fb1a583 RS |
528 | (local-copy |
529 | (jka-compr-run-real-handler 'file-local-copy (list filename))) | |
acd622cc | 530 | (temp-file (jka-compr-make-temp-name t)) |
30c78e11 | 531 | (temp-buffer (get-buffer-create " *jka-compr-flc-temp*")) |
acd622cc RS |
532 | local-file) |
533 | ||
534 | (setq local-file (or local-copy filename)) | |
535 | ||
536 | (unwind-protect | |
537 | ||
75e9c107 | 538 | (with-current-buffer temp-buffer |
f1180544 | 539 | |
acd622cc RS |
540 | (and |
541 | uncompress-message | |
542 | (message "%s %s..." uncompress-message base-name)) | |
f1180544 | 543 | |
baefb016 KH |
544 | ;; Here we must read the output of uncompress program |
545 | ;; and write it to TEMP-FILE without any code | |
546 | ;; conversion. An appropriate code conversion (if | |
547 | ;; necessary) is done by the later I/O operation | |
548 | ;; (e.g. load). | |
549 | (let ((coding-system-for-read 'no-conversion) | |
550 | (coding-system-for-write 'no-conversion)) | |
551 | ||
552 | (jka-compr-call-process uncompress-program | |
553 | (concat uncompress-message | |
554 | " " base-name) | |
555 | local-file | |
556 | t | |
557 | nil | |
558 | uncompress-args) | |
559 | ||
560 | (and | |
561 | uncompress-message | |
562 | (message "%s %s...done" uncompress-message base-name)) | |
563 | ||
564 | (write-region | |
565 | (point-min) (point-max) temp-file nil 'dont))) | |
acd622cc RS |
566 | |
567 | (and | |
568 | local-copy | |
569 | (file-exists-p local-copy) | |
570 | (delete-file local-copy)) | |
571 | ||
acd622cc RS |
572 | (kill-buffer temp-buffer)) |
573 | ||
574 | temp-file) | |
f1180544 | 575 | |
8fb1a583 | 576 | (jka-compr-run-real-handler 'file-local-copy (list filename))))) |
acd622cc RS |
577 | |
578 | ||
f6cb7e0a | 579 | ;; Support for loading compressed files. |
acd622cc RS |
580 | (defun jka-compr-load (file &optional noerror nomessage nosuffix) |
581 | "Documented as original." | |
582 | ||
583 | (let* ((local-copy (jka-compr-file-local-copy file)) | |
584 | (load-file (or local-copy file))) | |
585 | ||
586 | (unwind-protect | |
587 | ||
8fb1a583 RS |
588 | (let (inhibit-file-name-operation |
589 | inhibit-file-name-handlers) | |
acd622cc RS |
590 | (or nomessage |
591 | (message "Loading %s..." file)) | |
592 | ||
9b37d8a9 RS |
593 | (let ((load-force-doc-strings t)) |
594 | (load load-file noerror t t)) | |
acd622cc | 595 | (or nomessage |
e645e77b DL |
596 | (message "Loading %s...done." file)) |
597 | ;; Fix up the load history to point at the right library. | |
598 | (let ((l (assoc load-file load-history))) | |
599 | ;; Remove .gz and .elc?. | |
600 | (while (file-name-extension file) | |
601 | (setq file (file-name-sans-extension file))) | |
602 | (setcar l file))) | |
acd622cc | 603 | |
acd622cc RS |
604 | (jka-compr-delete-temp-file local-copy)) |
605 | ||
606 | t)) | |
3068998d RS |
607 | |
608 | (defun jka-compr-byte-compiler-base-file-name (file) | |
609 | (let ((info (jka-compr-get-compression-info file))) | |
610 | (if (and info (jka-compr-info-strip-extension info)) | |
611 | (save-match-data | |
612 | (substring file 0 (string-match (jka-compr-info-regexp info) file))) | |
613 | file))) | |
8fb1a583 RS |
614 | \f |
615 | (put 'write-region 'jka-compr 'jka-compr-write-region) | |
616 | (put 'insert-file-contents 'jka-compr 'jka-compr-insert-file-contents) | |
617 | (put 'file-local-copy 'jka-compr 'jka-compr-file-local-copy) | |
618 | (put 'load 'jka-compr 'jka-compr-load) | |
3068998d RS |
619 | (put 'byte-compiler-base-file-name 'jka-compr |
620 | 'jka-compr-byte-compiler-base-file-name) | |
acd622cc | 621 | |
0e2846fb | 622 | ;;;###autoload |
9fdf055b KH |
623 | (defvar jka-compr-inhibit nil |
624 | "Non-nil means inhibit automatic uncompression temporarily. | |
625 | Lisp programs can bind this to t to do that. | |
626 | It is not recommended to set this variable permanently to anything but nil.") | |
627 | ||
0e2846fb | 628 | ;;;###autoload |
acd622cc | 629 | (defun jka-compr-handler (operation &rest args) |
8fb1a583 RS |
630 | (save-match-data |
631 | (let ((jka-op (get operation 'jka-compr))) | |
9fdf055b | 632 | (if (and jka-op (not jka-compr-inhibit)) |
8fb1a583 RS |
633 | (apply jka-op args) |
634 | (jka-compr-run-real-handler operation args))))) | |
acd622cc | 635 | |
99bee6a4 RS |
636 | ;; If we are given an operation that we don't handle, |
637 | ;; call the Emacs primitive for that operation, | |
638 | ;; and manipulate the inhibit variables | |
639 | ;; to prevent the primitive from calling our handler again. | |
640 | (defun jka-compr-run-real-handler (operation args) | |
641 | (let ((inhibit-file-name-handlers | |
642 | (cons 'jka-compr-handler | |
643 | (and (eq inhibit-file-name-operation operation) | |
644 | inhibit-file-name-handlers))) | |
645 | (inhibit-file-name-operation operation)) | |
646 | (apply operation args))) | |
647 | ||
233c955d | 648 | ;;;###autoload |
acd622cc RS |
649 | (defun jka-compr-uninstall () |
650 | "Uninstall jka-compr. | |
99bee6a4 | 651 | This removes the entries in `file-name-handler-alist' and `auto-mode-alist' |
919a07bb RS |
652 | and `inhibit-first-line-modes-suffixes' that were added |
653 | by `jka-compr-installed'." | |
654 | ;; Delete from inhibit-first-line-modes-suffixes | |
655 | ;; what jka-compr-install added. | |
0c53638a | 656 | (mapc |
919a07bb RS |
657 | (function (lambda (x) |
658 | (and (jka-compr-info-strip-extension x) | |
659 | (setq inhibit-first-line-modes-suffixes | |
660 | (delete (jka-compr-info-regexp x) | |
661 | inhibit-first-line-modes-suffixes))))) | |
0c53638a | 662 | jka-compr-compression-info-list--internal) |
acd622cc RS |
663 | |
664 | (let* ((fnha (cons nil file-name-handler-alist)) | |
665 | (last fnha)) | |
666 | ||
667 | (while (cdr last) | |
668 | (if (eq (cdr (car (cdr last))) 'jka-compr-handler) | |
669 | (setcdr last (cdr (cdr last))) | |
670 | (setq last (cdr last)))) | |
671 | ||
672 | (setq file-name-handler-alist (cdr fnha))) | |
673 | ||
674 | (let* ((ama (cons nil auto-mode-alist)) | |
675 | (last ama) | |
676 | entry) | |
677 | ||
678 | (while (cdr last) | |
679 | (setq entry (car (cdr last))) | |
0c53638a | 680 | (if (or (member entry jka-compr-mode-alist-additions--internal) |
74b2c737 RS |
681 | (and (consp (cdr entry)) |
682 | (eq (nth 2 entry) 'jka-compr))) | |
acd622cc RS |
683 | (setcdr last (cdr (cdr last))) |
684 | (setq last (cdr last)))) | |
f1180544 | 685 | |
4eec33ae RS |
686 | (setq auto-mode-alist (cdr ama))) |
687 | ||
f6cb7e0a SM |
688 | (while jka-compr-added-to-file-coding-system-alist |
689 | (setq file-coding-system-alist | |
690 | (delq (car (member (pop jka-compr-added-to-file-coding-system-alist) | |
691 | file-coding-system-alist)) | |
692 | file-coding-system-alist))) | |
aab8a6e3 SM |
693 | |
694 | ;; Remove the suffixes that were added by jka-compr. | |
0c53638a LT |
695 | (dolist (suff jka-compr-load-suffixes--internal) |
696 | (setq load-file-rep-suffixes (delete suff load-file-rep-suffixes))) | |
697 | ||
698 | (setq jka-compr-compression-info-list--internal nil | |
699 | jka-compr-mode-alist-additions--internal nil | |
700 | jka-compr-load-suffixes--internal nil)) | |
acd622cc | 701 | |
acd622cc RS |
702 | (provide 'jka-compr) |
703 | ||
f6cb7e0a | 704 | ;; arch-tag: 3f15b630-e9a7-46c4-a22a-94afdde86ebc |
55535639 | 705 | ;;; jka-compr.el ends here |