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path: root/archival/bbunzip.c (plain)
blob: 7d5402e8d83a54efdb40ac8349d0d3b780f19579
1/* vi: set sw=4 ts=4: */
2/*
3 * Common code for gunzip-like applets
4 *
5 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
6 */
7#include "libbb.h"
8#include "bb_archive.h"
9
10/* lzop_main() uses bbunpack(), need this: */
11//kbuild:lib-$(CONFIG_LZOP) += bbunzip.o
12
13/* Note: must be kept in sync with archival/lzop.c */
14enum {
15 OPT_STDOUT = 1 << 0,
16 OPT_FORCE = 1 << 1,
17 /* only some decompressors: */
18 OPT_VERBOSE = 1 << 2,
19 OPT_QUIET = 1 << 3,
20 OPT_DECOMPRESS = 1 << 4,
21 OPT_TEST = 1 << 5,
22 SEAMLESS_MAGIC = (1 << 31) * SEAMLESS_COMPRESSION,
23};
24
25static
26int open_to_or_warn(int to_fd, const char *filename, int flags, int mode)
27{
28 int fd = open3_or_warn(filename, flags, mode);
29 if (fd < 0) {
30 return 1;
31 }
32 xmove_fd(fd, to_fd);
33 return 0;
34}
35
36char* FAST_FUNC append_ext(char *filename, const char *expected_ext)
37{
38 return xasprintf("%s.%s", filename, expected_ext);
39}
40
41int FAST_FUNC bbunpack(char **argv,
42 IF_DESKTOP(long long) int FAST_FUNC (*unpacker)(transformer_state_t *xstate),
43 char* FAST_FUNC (*make_new_name)(char *filename, const char *expected_ext),
44 const char *expected_ext
45)
46{
47 struct stat stat_buf;
48 IF_DESKTOP(long long) int status = 0;
49 char *filename, *new_name;
50 smallint exitcode = 0;
51 transformer_state_t xstate;
52
53 do {
54 /* NB: new_name is *maybe* malloc'ed! */
55 new_name = NULL;
56 filename = *argv; /* can be NULL - 'streaming' bunzip2 */
57
58 if (filename && LONE_DASH(filename))
59 filename = NULL;
60
61 /* Open src */
62 if (filename) {
63 if (!(option_mask32 & SEAMLESS_MAGIC)) {
64 if (stat(filename, &stat_buf) != 0) {
65 err_name:
66 bb_simple_perror_msg(filename);
67 err:
68 exitcode = 1;
69 goto free_name;
70 }
71 if (open_to_or_warn(STDIN_FILENO, filename, O_RDONLY, 0))
72 goto err;
73 } else {
74 /* "clever zcat" with FILE */
75 /* fail_if_not_compressed because zcat refuses uncompressed input */
76 int fd = open_zipped(filename, /*fail_if_not_compressed:*/ 1);
77 if (fd < 0)
78 goto err_name;
79 xmove_fd(fd, STDIN_FILENO);
80 }
81 } else
82 if (option_mask32 & SEAMLESS_MAGIC) {
83 /* "clever zcat" on stdin */
84 if (setup_unzip_on_fd(STDIN_FILENO, /*fail_if_not_compressed*/ 1))
85 goto err;
86 }
87
88 /* Special cases: test, stdout */
89 if (option_mask32 & (OPT_STDOUT|OPT_TEST)) {
90 if (option_mask32 & OPT_TEST)
91 if (open_to_or_warn(STDOUT_FILENO, bb_dev_null, O_WRONLY, 0))
92 xfunc_die();
93 filename = NULL;
94 }
95
96 /* Open dst if we are going to unpack to file */
97 if (filename) {
98 new_name = make_new_name(filename, expected_ext);
99 if (!new_name) {
100 bb_error_msg("%s: unknown suffix - ignored", filename);
101 goto err;
102 }
103
104 /* -f: overwrite existing output files */
105 if (option_mask32 & OPT_FORCE) {
106 unlink(new_name);
107 }
108
109 /* O_EXCL: "real" bunzip2 doesn't overwrite files */
110 /* GNU gunzip does not bail out, but goes to next file */
111 if (open_to_or_warn(STDOUT_FILENO, new_name, O_WRONLY | O_CREAT | O_EXCL,
112 stat_buf.st_mode))
113 goto err;
114 }
115
116 /* Check that the input is sane */
117 if (!(option_mask32 & OPT_FORCE) && isatty(STDIN_FILENO)) {
118 bb_error_msg_and_die("compressed data not read from terminal, "
119 "use -f to force it");
120 }
121
122 if (!(option_mask32 & SEAMLESS_MAGIC)) {
123 init_transformer_state(&xstate);
124 xstate.signature_skipped = 0;
125 /*xstate.src_fd = STDIN_FILENO; - already is */
126 xstate.dst_fd = STDOUT_FILENO;
127 status = unpacker(&xstate);
128 if (status < 0)
129 exitcode = 1;
130 } else {
131 if (bb_copyfd_eof(STDIN_FILENO, STDOUT_FILENO) < 0)
132 /* Disk full, tty closed, etc. No point in continuing */
133 xfunc_die();
134 }
135
136 if (!(option_mask32 & OPT_STDOUT))
137 xclose(STDOUT_FILENO); /* with error check! */
138
139 if (filename) {
140 char *del = new_name;
141
142 if (status >= 0) {
143 unsigned new_name_len;
144
145 /* TODO: restore other things? */
146 if (xstate.mtime != 0) {
147 struct timeval times[2];
148
149 times[1].tv_sec = times[0].tv_sec = xstate.mtime;
150 times[1].tv_usec = times[0].tv_usec = 0;
151 /* Note: we closed it first.
152 * On some systems calling utimes
153 * then closing resets the mtime
154 * back to current time. */
155 utimes(new_name, times); /* ignoring errors */
156 }
157
158 if (ENABLE_DESKTOP)
159 new_name_len = strlen(new_name);
160 /* Restore source filename (unless tgz -> tar case) */
161 if (new_name == filename) {
162 new_name_len = strlen(filename);
163 filename[new_name_len] = '.';
164 }
165 /* Extreme bloat for gunzip compat */
166 /* Some users do want this info... */
167 if (ENABLE_DESKTOP && (option_mask32 & OPT_VERBOSE)) {
168 unsigned percent = status
169 ? ((uoff_t)stat_buf.st_size * 100u / (unsigned long long)status)
170 : 0;
171 fprintf(stderr, "%s: %u%% - replaced with %.*s\n",
172 filename,
173 100u - percent,
174 new_name_len, new_name
175 );
176 }
177 /* Delete _source_ file */
178 del = filename;
179 }
180 xunlink(del);
181 free_name:
182 if (new_name != filename)
183 free(new_name);
184 }
185 } while (*argv && *++argv);
186
187 if (option_mask32 & OPT_STDOUT)
188 xclose(STDOUT_FILENO); /* with error check! */
189
190 return exitcode;
191}
192
193#if ENABLE_UNCOMPRESS || ENABLE_BUNZIP2 || ENABLE_UNLZMA || ENABLE_UNXZ
194static
195char* FAST_FUNC make_new_name_generic(char *filename, const char *expected_ext)
196{
197 char *extension = strrchr(filename, '.');
198 if (!extension || strcmp(extension + 1, expected_ext) != 0) {
199 /* Mimic GNU gunzip - "real" bunzip2 tries to */
200 /* unpack file anyway, to file.out */
201 return NULL;
202 }
203 *extension = '\0';
204 return filename;
205}
206#endif
207
208
209/*
210 * Uncompress applet for busybox (c) 2002 Glenn McGrath
211 *
212 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
213 */
214//usage:#define uncompress_trivial_usage
215//usage: "[-cf] [FILE]..."
216//usage:#define uncompress_full_usage "\n\n"
217//usage: "Decompress .Z file[s]\n"
218//usage: "\n -c Write to stdout"
219//usage: "\n -f Overwrite"
220
221//config:config UNCOMPRESS
222//config: bool "uncompress"
223//config: default n # ancient
224//config: help
225//config: uncompress is used to decompress archives created by compress.
226//config: Not much used anymore, replaced by gzip/gunzip.
227
228//applet:IF_UNCOMPRESS(APPLET(uncompress, BB_DIR_BIN, BB_SUID_DROP))
229//kbuild:lib-$(CONFIG_UNCOMPRESS) += bbunzip.o
230#if ENABLE_UNCOMPRESS
231int uncompress_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
232int uncompress_main(int argc UNUSED_PARAM, char **argv)
233{
234 getopt32(argv, "cf");
235 argv += optind;
236
237 return bbunpack(argv, unpack_Z_stream, make_new_name_generic, "Z");
238}
239#endif
240
241
242/*
243 * Gzip implementation for busybox
244 *
245 * Based on GNU gzip v1.2.4 Copyright (C) 1992-1993 Jean-loup Gailly.
246 *
247 * Originally adjusted for busybox by Sven Rudolph <sr1@inf.tu-dresden.de>
248 * based on gzip sources
249 *
250 * Adjusted further by Erik Andersen <andersen@codepoet.org> to support files as
251 * well as stdin/stdout, and to generally behave itself wrt command line
252 * handling.
253 *
254 * General cleanup to better adhere to the style guide and make use of standard
255 * busybox functions by Glenn McGrath
256 *
257 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
258 *
259 * gzip (GNU zip) -- compress files with zip algorithm and 'compress' interface
260 * Copyright (C) 1992-1993 Jean-loup Gailly
261 * The unzip code was written and put in the public domain by Mark Adler.
262 * Portions of the lzw code are derived from the public domain 'compress'
263 * written by Spencer Thomas, Joe Orost, James Woods, Jim McKie, Steve Davies,
264 * Ken Turkowski, Dave Mack and Peter Jannesen.
265 */
266//usage:#define gunzip_trivial_usage
267//usage: "[-cft] [FILE]..."
268//usage:#define gunzip_full_usage "\n\n"
269//usage: "Decompress FILEs (or stdin)\n"
270//usage: "\n -c Write to stdout"
271//usage: "\n -f Force"
272//usage: "\n -t Test file integrity"
273//usage:
274//usage:#define gunzip_example_usage
275//usage: "$ ls -la /tmp/BusyBox*\n"
276//usage: "-rw-rw-r-- 1 andersen andersen 557009 Apr 11 10:55 /tmp/BusyBox-0.43.tar.gz\n"
277//usage: "$ gunzip /tmp/BusyBox-0.43.tar.gz\n"
278//usage: "$ ls -la /tmp/BusyBox*\n"
279//usage: "-rw-rw-r-- 1 andersen andersen 1761280 Apr 14 17:47 /tmp/BusyBox-0.43.tar\n"
280//usage:
281//usage:#define zcat_trivial_usage
282//usage: "[FILE]..."
283//usage:#define zcat_full_usage "\n\n"
284//usage: "Decompress to stdout"
285
286//config:config GUNZIP
287//config: bool "gunzip"
288//config: default y
289//config: help
290//config: gunzip is used to decompress archives created by gzip.
291//config: You can use the `-t' option to test the integrity of
292//config: an archive, without decompressing it.
293//config:
294//config:config ZCAT
295//config: bool "zcat"
296//config: default y
297//config: help
298//config: Alias to "gunzip -c".
299//config:
300//config:config FEATURE_GUNZIP_LONG_OPTIONS
301//config: bool "Enable long options"
302//config: default y
303//config: depends on (GUNZIP || ZCAT) && LONG_OPTS
304//config: help
305//config: Enable use of long options.
306
307//applet:IF_GUNZIP(APPLET(gunzip, BB_DIR_BIN, BB_SUID_DROP))
308//applet:IF_ZCAT(APPLET_ODDNAME(zcat, gunzip, BB_DIR_BIN, BB_SUID_DROP, zcat))
309//kbuild:lib-$(CONFIG_GUNZIP) += bbunzip.o
310//kbuild:lib-$(CONFIG_ZCAT) += bbunzip.o
311#if ENABLE_GUNZIP || ENABLE_ZCAT
312static
313char* FAST_FUNC make_new_name_gunzip(char *filename, const char *expected_ext UNUSED_PARAM)
314{
315 char *extension = strrchr(filename, '.');
316
317 if (!extension)
318 return NULL;
319
320 extension++;
321 if (strcmp(extension, "tgz" + 1) == 0
322#if ENABLE_FEATURE_SEAMLESS_Z
323 || (extension[0] == 'Z' && extension[1] == '\0')
324#endif
325 ) {
326 extension[-1] = '\0';
327 } else if (strcmp(extension, "tgz") == 0) {
328 filename = xstrdup(filename);
329 extension = strrchr(filename, '.');
330 extension[2] = 'a';
331 extension[3] = 'r';
332 } else {
333 return NULL;
334 }
335 return filename;
336}
337
338#if ENABLE_FEATURE_GUNZIP_LONG_OPTIONS
339static const char gunzip_longopts[] ALIGN1 =
340 "stdout\0" No_argument "c"
341 "to-stdout\0" No_argument "c"
342 "force\0" No_argument "f"
343 "test\0" No_argument "t"
344 "no-name\0" No_argument "n"
345 ;
346#endif
347
348/*
349 * Linux kernel build uses gzip -d -n. We accept and ignore it.
350 * Man page says:
351 * -n --no-name
352 * gzip: do not save the original file name and time stamp.
353 * (The original name is always saved if the name had to be truncated.)
354 * gunzip: do not restore the original file name/time even if present
355 * (remove only the gzip suffix from the compressed file name).
356 * This option is the default when decompressing.
357 * -N --name
358 * gzip: always save the original file name and time stamp (this is the default)
359 * gunzip: restore the original file name and time stamp if present.
360 */
361int gunzip_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
362int gunzip_main(int argc UNUSED_PARAM, char **argv)
363{
364#if ENABLE_FEATURE_GUNZIP_LONG_OPTIONS
365 applet_long_options = gunzip_longopts;
366#endif
367 getopt32(argv, "cfvqdtn");
368 argv += optind;
369
370 /* If called as zcat...
371 * Normally, "zcat" is just "gunzip -c".
372 * But if seamless magic is enabled, then we are much more clever.
373 */
374 if (ENABLE_ZCAT && applet_name[1] == 'c')
375 option_mask32 |= OPT_STDOUT | SEAMLESS_MAGIC;
376
377 return bbunpack(argv, unpack_gz_stream, make_new_name_gunzip, /*unused:*/ NULL);
378}
379#endif
380
381
382/*
383 * Modified for busybox by Glenn McGrath
384 * Added support output to stdout by Thomas Lundquist <thomasez@zelow.no>
385 *
386 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
387 */
388//usage:#define bunzip2_trivial_usage
389//usage: "[-cf] [FILE]..."
390//usage:#define bunzip2_full_usage "\n\n"
391//usage: "Decompress FILEs (or stdin)\n"
392//usage: "\n -c Write to stdout"
393//usage: "\n -f Force"
394//usage:#define bzcat_trivial_usage
395//usage: "[FILE]..."
396//usage:#define bzcat_full_usage "\n\n"
397//usage: "Decompress to stdout"
398
399//config:config BUNZIP2
400//config: bool "bunzip2"
401//config: default y
402//config: help
403//config: bunzip2 is a compression utility using the Burrows-Wheeler block
404//config: sorting text compression algorithm, and Huffman coding. Compression
405//config: is generally considerably better than that achieved by more
406//config: conventional LZ77/LZ78-based compressors, and approaches the
407//config: performance of the PPM family of statistical compressors.
408//config:
409//config: Unless you have a specific application which requires bunzip2, you
410//config: should probably say N here.
411//config:
412//config:config BZCAT
413//config: bool "bzcat"
414//config: default y
415//config: help
416//config: Alias to "bunzip2 -c".
417
418//applet:IF_BUNZIP2(APPLET(bunzip2, BB_DIR_USR_BIN, BB_SUID_DROP))
419//applet:IF_BZCAT(APPLET_ODDNAME(bzcat, bunzip2, BB_DIR_USR_BIN, BB_SUID_DROP, bzcat))
420//kbuild:lib-$(CONFIG_BUNZIP2) += bbunzip.o
421//kbuild:lib-$(CONFIG_BZCAT) += bbunzip.o
422#if ENABLE_BUNZIP2 || ENABLE_BZCAT
423int bunzip2_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
424int bunzip2_main(int argc UNUSED_PARAM, char **argv)
425{
426 getopt32(argv, "cfvqdt");
427 argv += optind;
428 if (ENABLE_BZCAT && applet_name[2] == 'c') /* bzcat */
429 option_mask32 |= OPT_STDOUT;
430
431 return bbunpack(argv, unpack_bz2_stream, make_new_name_generic, "bz2");
432}
433#endif
434
435
436/*
437 * Small lzma deflate implementation.
438 * Copyright (C) 2006 Aurelien Jacobs <aurel@gnuage.org>
439 *
440 * Based on bunzip.c from busybox
441 *
442 * Licensed under GPLv2, see file LICENSE in this source tree.
443 */
444//usage:#define unlzma_trivial_usage
445//usage: "[-cf] [FILE]..."
446//usage:#define unlzma_full_usage "\n\n"
447//usage: "Decompress FILE (or stdin)\n"
448//usage: "\n -c Write to stdout"
449//usage: "\n -f Force"
450//usage:
451//usage:#define lzma_trivial_usage
452//usage: "-d [-cf] [FILE]..."
453//usage:#define lzma_full_usage "\n\n"
454//usage: "Decompress FILE (or stdin)\n"
455//usage: "\n -d Decompress"
456//usage: "\n -c Write to stdout"
457//usage: "\n -f Force"
458//usage:
459//usage:#define lzcat_trivial_usage
460//usage: "[FILE]..."
461//usage:#define lzcat_full_usage "\n\n"
462//usage: "Decompress to stdout"
463//usage:
464//usage:#define unxz_trivial_usage
465//usage: "[-cf] [FILE]..."
466//usage:#define unxz_full_usage "\n\n"
467//usage: "Decompress FILE (or stdin)\n"
468//usage: "\n -c Write to stdout"
469//usage: "\n -f Force"
470//usage:
471//usage:#define xz_trivial_usage
472//usage: "-d [-cf] [FILE]..."
473//usage:#define xz_full_usage "\n\n"
474//usage: "Decompress FILE (or stdin)\n"
475//usage: "\n -d Decompress"
476//usage: "\n -c Write to stdout"
477//usage: "\n -f Force"
478//usage:
479//usage:#define xzcat_trivial_usage
480//usage: "[FILE]..."
481//usage:#define xzcat_full_usage "\n\n"
482//usage: "Decompress to stdout"
483
484//config:config UNLZMA
485//config: bool "unlzma"
486//config: default y
487//config: help
488//config: unlzma is a compression utility using the Lempel-Ziv-Markov chain
489//config: compression algorithm, and range coding. Compression
490//config: is generally considerably better than that achieved by the bzip2
491//config: compressors.
492//config:
493//config: The BusyBox unlzma applet is limited to decompression only.
494//config: On an x86 system, this applet adds about 4K.
495//config:
496//config:config LZCAT
497//config: bool "lzcat"
498//config: default y
499//config: help
500//config: unlzma is a compression utility using the Lempel-Ziv-Markov chain
501//config: compression algorithm, and range coding. Compression
502//config: is generally considerably better than that achieved by the bzip2
503//config: compressors.
504//config:
505//config: The BusyBox unlzma applet is limited to decompression only.
506//config: On an x86 system, this applet adds about 4K.
507//config:
508//config:config LZMA
509//config: bool "lzma -d"
510//config: default y
511//config: help
512//config: Enable this option if you want commands like "lzma -d" to work.
513//config: IOW: you'll get lzma applet, but it will always require -d option.
514//config:
515//config:config FEATURE_LZMA_FAST
516//config: bool "Optimize unlzma for speed"
517//config: default n
518//config: depends on UNLZMA || LZCAT || LZMA
519//config: help
520//config: This option reduces decompression time by about 25% at the cost of
521//config: a 1K bigger binary.
522
523//applet:IF_UNLZMA(APPLET(unlzma, BB_DIR_USR_BIN, BB_SUID_DROP))
524//applet:IF_LZCAT(APPLET_ODDNAME(lzcat, unlzma, BB_DIR_USR_BIN, BB_SUID_DROP, lzcat))
525//applet:IF_LZMA(APPLET_ODDNAME(lzma, unlzma, BB_DIR_USR_BIN, BB_SUID_DROP, lzma))
526//kbuild:lib-$(CONFIG_UNLZMA) += bbunzip.o
527//kbuild:lib-$(CONFIG_LZCAT) += bbunzip.o
528//kbuild:lib-$(CONFIG_LZMA) += bbunzip.o
529#if ENABLE_UNLZMA || ENABLE_LZCAT || ENABLE_LZMA
530int unlzma_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
531int unlzma_main(int argc UNUSED_PARAM, char **argv)
532{
533 IF_LZMA(int opts =) getopt32(argv, "cfvqdt");
534# if ENABLE_LZMA
535 /* lzma without -d or -t? */
536 if (applet_name[2] == 'm' && !(opts & (OPT_DECOMPRESS|OPT_TEST)))
537 bb_show_usage();
538# endif
539 /* lzcat? */
540 if (ENABLE_LZCAT && applet_name[2] == 'c')
541 option_mask32 |= OPT_STDOUT;
542
543 argv += optind;
544 return bbunpack(argv, unpack_lzma_stream, make_new_name_generic, "lzma");
545}
546#endif
547
548
549//config:config UNXZ
550//config: bool "unxz"
551//config: default y
552//config: help
553//config: unxz is a unlzma successor.
554//config:
555//config:config XZCAT
556//config: bool "xzcat"
557//config: default y
558//config: help
559//config: Alias to "unxz -c".
560//config:
561//config:config XZ
562//config: bool "xz -d"
563//config: default y
564//config: help
565//config: Enable this option if you want commands like "xz -d" to work.
566//config: IOW: you'll get xz applet, but it will always require -d option.
567
568//applet:IF_UNXZ(APPLET(unxz, BB_DIR_USR_BIN, BB_SUID_DROP))
569//applet:IF_XZCAT(APPLET_ODDNAME(xzcat, unxz, BB_DIR_USR_BIN, BB_SUID_DROP, xzcat))
570//applet:IF_XZ(APPLET_ODDNAME(xz, unxz, BB_DIR_USR_BIN, BB_SUID_DROP, xz))
571//kbuild:lib-$(CONFIG_UNXZ) += bbunzip.o
572//kbuild:lib-$(CONFIG_XZCAT) += bbunzip.o
573//kbuild:lib-$(CONFIG_XZ) += bbunzip.o
574#if ENABLE_UNXZ || ENABLE_XZCAT || ENABLE_XZ
575int unxz_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
576int unxz_main(int argc UNUSED_PARAM, char **argv)
577{
578 IF_XZ(int opts =) getopt32(argv, "cfvqdt");
579# if ENABLE_XZ
580 /* xz without -d or -t? */
581 if (applet_name[2] == '\0' && !(opts & (OPT_DECOMPRESS|OPT_TEST)))
582 bb_show_usage();
583# endif
584 /* xzcat? */
585 if (ENABLE_XZCAT && applet_name[2] == 'c')
586 option_mask32 |= OPT_STDOUT;
587
588 argv += optind;
589 return bbunpack(argv, unpack_xz_stream, make_new_name_generic, "xz");
590}
591#endif
592
generated by cgit at 2024-05-16 01:28:41 (GMT)