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 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);
76 /* O_EXCL: "real" bunzip2 doesn't overwrite files */
77 /* GNU gunzip does not bail out, but goes to next file */
78 if (open_to_or_warn(STDOUT_FILENO, new_name, O_WRONLY | O_CREAT | O_EXCL,
83 /* Check that the input is sane */
84 if (isatty(STDIN_FILENO) && (option_mask32 & OPT_FORCE) == 0) {
85 bb_error_msg_and_die("compressed data not read from terminal, "
86 "use -f to force it");
96 /* TODO: restore user/group/times here? */
97 /* Delete _compressed_ file */
99 /* restore extension (unless tgz -> tar case) */
100 if (new_name == filename)
101 filename[strlen(filename)] = '.';
105 #if 0 /* Currently buggy - wrong name: "a.gz: 261% - replaced with a.gz" */
106 /* Extreme bloat for gunzip compat */
107 if (ENABLE_DESKTOP && (option_mask32 & OPT_VERBOSE) && status >= 0) {
108 fprintf(stderr, "%s: %u%% - replaced with %s\n",
109 filename, (unsigned)(stat_buf.st_size*100 / (status+1)), new_name);
114 if (new_name != filename)
117 } while (*argv && *++argv);
122 #if ENABLE_BUNZIP2 || ENABLE_UNLZMA || ENABLE_UNCOMPRESS
125 char* make_new_name_generic(char *filename, const char *expected_ext)
127 char *extension = strrchr(filename, '.');
128 if (!extension || strcmp(extension + 1, expected_ext) != 0) {
129 /* Mimic GNU gunzip - "real" bunzip2 tries to */
130 /* unpack file anyway, to file.out */
141 * Modified for busybox by Glenn McGrath
142 * Added support output to stdout by Thomas Lundquist <thomasez@zelow.no>
144 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
150 char* make_new_name_bunzip2(char *filename)
152 return make_new_name_generic(filename, "bz2");
156 USE_DESKTOP(long long) int unpack_bunzip2(void)
158 return unpack_bz2_stream(STDIN_FILENO, STDOUT_FILENO);
161 int bunzip2_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
162 int bunzip2_main(int argc ATTRIBUTE_UNUSED, char **argv)
164 getopt32(argv, "cfvdt");
166 if (applet_name[2] == 'c')
167 option_mask32 |= OPT_STDOUT;
169 return bbunpack(argv, make_new_name_bunzip2, unpack_bunzip2);
176 * Gzip implementation for busybox
178 * Based on GNU gzip v1.2.4 Copyright (C) 1992-1993 Jean-loup Gailly.
180 * Originally adjusted for busybox by Sven Rudolph <sr1@inf.tu-dresden.de>
181 * based on gzip sources
183 * Adjusted further by Erik Andersen <andersen@codepoet.org> to support files as
184 * well as stdin/stdout, and to generally behave itself wrt command line
187 * General cleanup to better adhere to the style guide and make use of standard
188 * busybox functions by Glenn McGrath
190 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
192 * gzip (GNU zip) -- compress files with zip algorithm and 'compress' interface
193 * Copyright (C) 1992-1993 Jean-loup Gailly
194 * The unzip code was written and put in the public domain by Mark Adler.
195 * Portions of the lzw code are derived from the public domain 'compress'
196 * written by Spencer Thomas, Joe Orost, James Woods, Jim McKie, Steve Davies,
197 * Ken Turkowski, Dave Mack and Peter Jannesen.
199 * See the license_msg below and the file COPYING for the software license.
200 * See the file algorithm.doc for the compression algorithms and file formats.
206 char* make_new_name_gunzip(char *filename)
208 char *extension = strrchr(filename, '.');
214 if (strcmp(extension, "tgz" + 1) == 0
215 #if ENABLE_FEATURE_GUNZIP_UNCOMPRESS
216 || strcmp(extension, "Z") == 0
219 extension[-1] = '\0';
220 } else if (strcmp(extension, "tgz") == 0) {
221 filename = xstrdup(filename);
222 extension = strrchr(filename, '.');
232 USE_DESKTOP(long long) int unpack_gunzip(void)
234 USE_DESKTOP(long long) int status = -1;
236 /* do the decompression, and cleanup */
237 if (xread_char(STDIN_FILENO) == 0x1f) {
238 unsigned char magic2;
240 magic2 = xread_char(STDIN_FILENO);
241 if (ENABLE_FEATURE_GUNZIP_UNCOMPRESS && magic2 == 0x9d) {
242 status = uncompress(STDIN_FILENO, STDOUT_FILENO);
243 } else if (magic2 == 0x8b) {
244 status = unpack_gz_stream(STDIN_FILENO, STDOUT_FILENO);
249 bb_error_msg("error inflating");
253 bb_error_msg("invalid magic");
254 /* status is still == -1 */
260 * Linux kernel build uses gzip -d -n. We accept and ignore it.
263 * gzip: do not save the original file name and time stamp.
264 * (The original name is always saved if the name had to be truncated.)
265 * gunzip: do not restore the original file name/time even if present
266 * (remove only the gzip suffix from the compressed file name).
267 * This option is the default when decompressing.
269 * gzip: always save the original file name and time stamp (this is the default)
270 * gunzip: restore the original file name and time stamp if present.
273 int gunzip_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
274 int gunzip_main(int argc ATTRIBUTE_UNUSED, char **argv)
276 getopt32(argv, "cfvdtn");
278 /* if called as zcat */
279 if (applet_name[1] == 'c')
280 option_mask32 |= OPT_STDOUT;
282 return bbunpack(argv, make_new_name_gunzip, unpack_gunzip);
289 * Small lzma deflate implementation.
290 * Copyright (C) 2006 Aurelien Jacobs <aurel@gnuage.org>
292 * Based on bunzip.c from busybox
294 * Licensed under GPL v2, see file LICENSE in this tarball for details.
300 char* make_new_name_unlzma(char *filename)
302 return make_new_name_generic(filename, "lzma");
306 USE_DESKTOP(long long) int unpack_unlzma(void)
308 return unpack_lzma_stream(STDIN_FILENO, STDOUT_FILENO);
311 int unlzma_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
312 int unlzma_main(int argc ATTRIBUTE_UNUSED, char **argv)
314 getopt32(argv, "cf");
317 if (applet_name[4] == 'c')
318 option_mask32 |= OPT_STDOUT;
320 return bbunpack(argv, make_new_name_unlzma, unpack_unlzma);
327 * Uncompress applet for busybox (c) 2002 Glenn McGrath
329 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
332 #if ENABLE_UNCOMPRESS
335 char* make_new_name_uncompress(char *filename)
337 return make_new_name_generic(filename, "Z");
341 USE_DESKTOP(long long) int unpack_uncompress(void)
343 USE_DESKTOP(long long) int status = -1;
345 if ((xread_char(STDIN_FILENO) != 0x1f) || (xread_char(STDIN_FILENO) != 0x9d)) {
346 bb_error_msg("invalid magic");
348 status = uncompress(STDIN_FILENO, STDOUT_FILENO);
353 int uncompress_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
354 int uncompress_main(int argc ATTRIBUTE_UNUSED, char **argv)
356 getopt32(argv, "cf");
359 return bbunpack(argv, make_new_name_uncompress, unpack_uncompress);