1 /* vi: set sw=4 ts=4: */
3 * Common code for gunzip-like applets
5 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
13 /* only some decompressors: */
15 OPT_DECOMPRESS = 1 << 3,
20 int open_to_or_warn(int to_fd, const char *filename, int flags, int mode)
22 int fd = open3_or_warn(filename, flags, mode);
30 int FAST_FUNC bbunpack(char **argv,
31 char* (*make_new_name)(char *filename),
32 IF_DESKTOP(long long) int (*unpacker)(unpack_info_t *info)
36 IF_DESKTOP(long long) int status;
37 char *filename, *new_name;
38 smallint exitcode = 0;
42 /* NB: new_name is *maybe* malloc'ed! */
44 filename = *argv; /* can be NULL - 'streaming' bunzip2 */
46 if (filename && LONE_DASH(filename))
51 if (stat(filename, &stat_buf) != 0) {
52 bb_simple_perror_msg(filename);
57 if (open_to_or_warn(STDIN_FILENO, filename, O_RDONLY, 0))
61 /* Special cases: test, stdout */
62 if (option_mask32 & (OPT_STDOUT|OPT_TEST)) {
63 if (option_mask32 & OPT_TEST)
64 if (open_to_or_warn(STDOUT_FILENO, bb_dev_null, O_WRONLY, 0))
69 /* Open dst if we are going to unpack to file */
71 new_name = make_new_name(filename);
73 bb_error_msg("%s: unknown suffix - ignored", filename);
77 /* -f: overwrite existing output files */
78 if (option_mask32 & OPT_FORCE) {
82 /* O_EXCL: "real" bunzip2 doesn't overwrite files */
83 /* GNU gunzip does not bail out, but goes to next file */
84 if (open_to_or_warn(STDOUT_FILENO, new_name, O_WRONLY | O_CREAT | O_EXCL,
89 /* Check that the input is sane */
90 if (isatty(STDIN_FILENO) && (option_mask32 & OPT_FORCE) == 0) {
91 bb_error_msg_and_die("compressed data not read from terminal, "
92 "use -f to force it");
95 /* memset(&info, 0, sizeof(info)); */
96 info.mtime = 0; /* so far it has one member only */
97 status = unpacker(&info);
100 xclose(STDOUT_FILENO); /* with error check! */
103 char *del = new_name;
105 /* TODO: restore other things? */
107 struct timeval times[2];
109 times[1].tv_sec = times[0].tv_sec = info.mtime;
110 times[1].tv_usec = times[0].tv_usec = 0;
111 /* Note: we closed it first.
112 * On some systems calling utimes
113 * then closing resets the mtime
114 * back to current time. */
115 utimes(new_name, times); /* ignoring errors */
118 /* Delete _compressed_ file */
120 /* restore extension (unless tgz -> tar case) */
121 if (new_name == filename)
122 filename[strlen(filename)] = '.';
126 #if 0 /* Currently buggy - wrong name: "a.gz: 261% - replaced with a.gz" */
127 /* Extreme bloat for gunzip compat */
128 if (ENABLE_DESKTOP && (option_mask32 & OPT_VERBOSE) && status >= 0) {
129 fprintf(stderr, "%s: %u%% - replaced with %s\n",
130 filename, (unsigned)(stat_buf.st_size*100 / (status+1)), new_name);
135 if (new_name != filename)
138 } while (*argv && *++argv);
143 #if ENABLE_UNCOMPRESS || ENABLE_BUNZIP2 || ENABLE_UNLZMA || ENABLE_UNXZ
145 char* make_new_name_generic(char *filename, const char *expected_ext)
147 char *extension = strrchr(filename, '.');
148 if (!extension || strcmp(extension + 1, expected_ext) != 0) {
149 /* Mimic GNU gunzip - "real" bunzip2 tries to */
150 /* unpack file anyway, to file.out */
160 * Uncompress applet for busybox (c) 2002 Glenn McGrath
162 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
164 #if ENABLE_UNCOMPRESS
166 char* make_new_name_uncompress(char *filename)
168 return make_new_name_generic(filename, "Z");
171 IF_DESKTOP(long long) int unpack_uncompress(unpack_info_t *info UNUSED_PARAM)
173 IF_DESKTOP(long long) int status = -1;
175 if ((xread_char(STDIN_FILENO) != 0x1f) || (xread_char(STDIN_FILENO) != 0x9d)) {
176 bb_error_msg("invalid magic");
178 status = unpack_Z_stream(STDIN_FILENO, STDOUT_FILENO);
182 int uncompress_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
183 int uncompress_main(int argc UNUSED_PARAM, char **argv)
185 getopt32(argv, "cf");
188 return bbunpack(argv, make_new_name_uncompress, unpack_uncompress);
194 * Gzip implementation for busybox
196 * Based on GNU gzip v1.2.4 Copyright (C) 1992-1993 Jean-loup Gailly.
198 * Originally adjusted for busybox by Sven Rudolph <sr1@inf.tu-dresden.de>
199 * based on gzip sources
201 * Adjusted further by Erik Andersen <andersen@codepoet.org> to support files as
202 * well as stdin/stdout, and to generally behave itself wrt command line
205 * General cleanup to better adhere to the style guide and make use of standard
206 * busybox functions by Glenn McGrath
208 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
210 * gzip (GNU zip) -- compress files with zip algorithm and 'compress' interface
211 * Copyright (C) 1992-1993 Jean-loup Gailly
212 * The unzip code was written and put in the public domain by Mark Adler.
213 * Portions of the lzw code are derived from the public domain 'compress'
214 * written by Spencer Thomas, Joe Orost, James Woods, Jim McKie, Steve Davies,
215 * Ken Turkowski, Dave Mack and Peter Jannesen.
217 * See the license_msg below and the file COPYING for the software license.
218 * See the file algorithm.doc for the compression algorithms and file formats.
222 char* make_new_name_gunzip(char *filename)
224 char *extension = strrchr(filename, '.');
230 if (strcmp(extension, "tgz" + 1) == 0
231 #if ENABLE_FEATURE_SEAMLESS_Z
232 || (extension[0] == 'Z' && extension[1] == '\0')
235 extension[-1] = '\0';
236 } else if (strcmp(extension, "tgz") == 0) {
237 filename = xstrdup(filename);
238 extension = strrchr(filename, '.');
247 IF_DESKTOP(long long) int unpack_gunzip(unpack_info_t *info)
249 IF_DESKTOP(long long) int status = -1;
251 /* do the decompression, and cleanup */
252 if (xread_char(STDIN_FILENO) == 0x1f) {
253 unsigned char magic2;
255 magic2 = xread_char(STDIN_FILENO);
256 if (ENABLE_FEATURE_SEAMLESS_Z && magic2 == 0x9d) {
257 status = unpack_Z_stream(STDIN_FILENO, STDOUT_FILENO);
258 } else if (magic2 == 0x8b) {
259 status = unpack_gz_stream_with_info(STDIN_FILENO, STDOUT_FILENO, info);
264 bb_error_msg("error inflating");
268 bb_error_msg("invalid magic");
269 /* status is still == -1 */
274 * Linux kernel build uses gzip -d -n. We accept and ignore it.
277 * gzip: do not save the original file name and time stamp.
278 * (The original name is always saved if the name had to be truncated.)
279 * gunzip: do not restore the original file name/time even if present
280 * (remove only the gzip suffix from the compressed file name).
281 * This option is the default when decompressing.
283 * gzip: always save the original file name and time stamp (this is the default)
284 * gunzip: restore the original file name and time stamp if present.
286 int gunzip_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
287 int gunzip_main(int argc UNUSED_PARAM, char **argv)
289 getopt32(argv, "cfvdtn");
291 /* if called as zcat */
292 if (applet_name[1] == 'c')
293 option_mask32 |= OPT_STDOUT;
295 return bbunpack(argv, make_new_name_gunzip, unpack_gunzip);
301 * Modified for busybox by Glenn McGrath
302 * Added support output to stdout by Thomas Lundquist <thomasez@zelow.no>
304 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
308 char* make_new_name_bunzip2(char *filename)
310 return make_new_name_generic(filename, "bz2");
313 IF_DESKTOP(long long) int unpack_bunzip2(unpack_info_t *info UNUSED_PARAM)
315 return unpack_bz2_stream_prime(STDIN_FILENO, STDOUT_FILENO);
317 int bunzip2_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
318 int bunzip2_main(int argc UNUSED_PARAM, char **argv)
320 getopt32(argv, "cfvdt");
322 if (applet_name[2] == 'c') /* bzcat */
323 option_mask32 |= OPT_STDOUT;
325 return bbunpack(argv, make_new_name_bunzip2, unpack_bunzip2);
331 * Small lzma deflate implementation.
332 * Copyright (C) 2006 Aurelien Jacobs <aurel@gnuage.org>
334 * Based on bunzip.c from busybox
336 * Licensed under GPL v2, see file LICENSE in this tarball for details.
340 char* make_new_name_unlzma(char *filename)
342 return make_new_name_generic(filename, "lzma");
345 IF_DESKTOP(long long) int unpack_unlzma(unpack_info_t *info UNUSED_PARAM)
347 return unpack_lzma_stream(STDIN_FILENO, STDOUT_FILENO);
349 int unlzma_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
350 int unlzma_main(int argc UNUSED_PARAM, char **argv)
352 IF_LZMA(int opts =) getopt32(argv, "cfvdt");
354 /* lzma without -d or -t? */
355 if (applet_name[2] == 'm' && !(opts & (OPT_DECOMPRESS|OPT_TEST)))
359 if (applet_name[2] == 'c')
360 option_mask32 |= OPT_STDOUT;
363 return bbunpack(argv, make_new_name_unlzma, unpack_unlzma);
370 char* make_new_name_unxz(char *filename)
372 return make_new_name_generic(filename, "xz");
375 IF_DESKTOP(long long) int unpack_unxz(unpack_info_t *info UNUSED_PARAM)
377 return unpack_xz_stream_stdin();
379 int unxz_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
380 int unxz_main(int argc UNUSED_PARAM, char **argv)
382 int opts = getopt32(argv, "cfvdt");
384 /* xz without -d or -t? */
385 if (applet_name[2] == '\0' && !(opts & (OPT_DECOMPRESS|OPT_TEST)))
389 if (applet_name[2] == 'c')
390 option_mask32 |= OPT_STDOUT;
393 return bbunpack(argv, make_new_name_unxz, unpack_unxz);