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.
14 /* gunzip and bunzip2 only: */
21 int open_to_or_warn(int to_fd, const char *filename, int flags, int mode)
23 int fd = open3_or_warn(filename, flags, mode);
31 int FAST_FUNC bbunpack(char **argv,
32 char* (*make_new_name)(char *filename),
33 USE_DESKTOP(long long) int (*unpacker)(void)
37 USE_DESKTOP(long long) int status;
38 char *filename, *new_name;
39 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");
100 char *del = new_name;
102 /* TODO: restore user/group/times here? */
103 /* Delete _compressed_ file */
105 /* restore extension (unless tgz -> tar case) */
106 if (new_name == filename)
107 filename[strlen(filename)] = '.';
111 #if 0 /* Currently buggy - wrong name: "a.gz: 261% - replaced with a.gz" */
112 /* Extreme bloat for gunzip compat */
113 if (ENABLE_DESKTOP && (option_mask32 & OPT_VERBOSE) && status >= 0) {
114 fprintf(stderr, "%s: %u%% - replaced with %s\n",
115 filename, (unsigned)(stat_buf.st_size*100 / (status+1)), new_name);
120 if (new_name != filename)
123 } while (*argv && *++argv);
128 #if ENABLE_BUNZIP2 || ENABLE_UNLZMA || ENABLE_UNCOMPRESS
131 char* make_new_name_generic(char *filename, const char *expected_ext)
133 char *extension = strrchr(filename, '.');
134 if (!extension || strcmp(extension + 1, expected_ext) != 0) {
135 /* Mimic GNU gunzip - "real" bunzip2 tries to */
136 /* unpack file anyway, to file.out */
147 * Modified for busybox by Glenn McGrath
148 * Added support output to stdout by Thomas Lundquist <thomasez@zelow.no>
150 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
156 char* make_new_name_bunzip2(char *filename)
158 return make_new_name_generic(filename, "bz2");
162 USE_DESKTOP(long long) int unpack_bunzip2(void)
164 return unpack_bz2_stream_prime(STDIN_FILENO, STDOUT_FILENO);
167 int bunzip2_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
168 int bunzip2_main(int argc UNUSED_PARAM, char **argv)
170 getopt32(argv, "cfvdt");
172 if (applet_name[2] == 'c')
173 option_mask32 |= OPT_STDOUT;
175 return bbunpack(argv, make_new_name_bunzip2, unpack_bunzip2);
182 * Gzip implementation for busybox
184 * Based on GNU gzip v1.2.4 Copyright (C) 1992-1993 Jean-loup Gailly.
186 * Originally adjusted for busybox by Sven Rudolph <sr1@inf.tu-dresden.de>
187 * based on gzip sources
189 * Adjusted further by Erik Andersen <andersen@codepoet.org> to support files as
190 * well as stdin/stdout, and to generally behave itself wrt command line
193 * General cleanup to better adhere to the style guide and make use of standard
194 * busybox functions by Glenn McGrath
196 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
198 * gzip (GNU zip) -- compress files with zip algorithm and 'compress' interface
199 * Copyright (C) 1992-1993 Jean-loup Gailly
200 * The unzip code was written and put in the public domain by Mark Adler.
201 * Portions of the lzw code are derived from the public domain 'compress'
202 * written by Spencer Thomas, Joe Orost, James Woods, Jim McKie, Steve Davies,
203 * Ken Turkowski, Dave Mack and Peter Jannesen.
205 * See the license_msg below and the file COPYING for the software license.
206 * See the file algorithm.doc for the compression algorithms and file formats.
212 char* make_new_name_gunzip(char *filename)
214 char *extension = strrchr(filename, '.');
220 if (strcmp(extension, "tgz" + 1) == 0
221 #if ENABLE_FEATURE_SEAMLESS_Z
222 || (extension[0] == 'Z' && extension[1] == '\0')
225 extension[-1] = '\0';
226 } else if (strcmp(extension, "tgz") == 0) {
227 filename = xstrdup(filename);
228 extension = strrchr(filename, '.');
238 USE_DESKTOP(long long) int unpack_gunzip(void)
240 USE_DESKTOP(long long) int status = -1;
242 /* do the decompression, and cleanup */
243 if (xread_char(STDIN_FILENO) == 0x1f) {
244 unsigned char magic2;
246 magic2 = xread_char(STDIN_FILENO);
247 if (ENABLE_FEATURE_SEAMLESS_Z && magic2 == 0x9d) {
248 status = unpack_Z_stream(STDIN_FILENO, STDOUT_FILENO);
249 } else if (magic2 == 0x8b) {
250 status = unpack_gz_stream(STDIN_FILENO, STDOUT_FILENO);
255 bb_error_msg("error inflating");
259 bb_error_msg("invalid magic");
260 /* status is still == -1 */
266 * Linux kernel build uses gzip -d -n. We accept and ignore it.
269 * gzip: do not save the original file name and time stamp.
270 * (The original name is always saved if the name had to be truncated.)
271 * gunzip: do not restore the original file name/time even if present
272 * (remove only the gzip suffix from the compressed file name).
273 * This option is the default when decompressing.
275 * gzip: always save the original file name and time stamp (this is the default)
276 * gunzip: restore the original file name and time stamp if present.
279 int gunzip_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
280 int gunzip_main(int argc UNUSED_PARAM, char **argv)
282 getopt32(argv, "cfvdtn");
284 /* if called as zcat */
285 if (applet_name[1] == 'c')
286 option_mask32 |= OPT_STDOUT;
288 return bbunpack(argv, make_new_name_gunzip, unpack_gunzip);
295 * Small lzma deflate implementation.
296 * Copyright (C) 2006 Aurelien Jacobs <aurel@gnuage.org>
298 * Based on bunzip.c from busybox
300 * Licensed under GPL v2, see file LICENSE in this tarball for details.
306 char* make_new_name_unlzma(char *filename)
308 return make_new_name_generic(filename, "lzma");
312 USE_DESKTOP(long long) int unpack_unlzma(void)
314 return unpack_lzma_stream(STDIN_FILENO, STDOUT_FILENO);
317 int unlzma_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
318 int unlzma_main(int argc UNUSED_PARAM, char **argv)
320 getopt32(argv, "cf");
323 if (applet_name[4] == 'c')
324 option_mask32 |= OPT_STDOUT;
326 return bbunpack(argv, make_new_name_unlzma, unpack_unlzma);
333 * Uncompress applet for busybox (c) 2002 Glenn McGrath
335 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
338 #if ENABLE_UNCOMPRESS
341 char* make_new_name_uncompress(char *filename)
343 return make_new_name_generic(filename, "Z");
347 USE_DESKTOP(long long) int unpack_uncompress(void)
349 USE_DESKTOP(long long) int status = -1;
351 if ((xread_char(STDIN_FILENO) != 0x1f) || (xread_char(STDIN_FILENO) != 0x9d)) {
352 bb_error_msg("invalid magic");
354 status = unpack_Z_stream(STDIN_FILENO, STDOUT_FILENO);
359 int uncompress_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
360 int uncompress_main(int argc UNUSED_PARAM, char **argv)
362 getopt32(argv, "cf");
365 return bbunpack(argv, make_new_name_uncompress, unpack_uncompress);