busybox/archival/bbunzip.c

/* vi: set sw=4 ts=4: */
/*
 *  Common code for gunzip-like applets
 *
 *  Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
 */
#include "libbb.h"
#include "unarchive.h"

enum {
	OPT_STDOUT     = 1 << 0,
	OPT_FORCE      = 1 << 1,
	/* only some decompressors: */
	OPT_VERBOSE    = 1 << 2,
	OPT_DECOMPRESS = 1 << 3,
	OPT_TEST       = 1 << 4,
};

static
int open_to_or_warn(int to_fd, const char *filename, int flags, int mode)
{
	int fd = open3_or_warn(filename, flags, mode);
	if (fd < 0) {
		return 1;
	}
	xmove_fd(fd, to_fd);
	return 0;
}

char* FAST_FUNC append_ext(char *filename, const char *expected_ext)
{
	return xasprintf("%s.%s", filename, expected_ext);
}

int FAST_FUNC bbunpack(char **argv,
	IF_DESKTOP(long long) int FAST_FUNC (*unpacker)(unpack_info_t *info),
	char* FAST_FUNC (*make_new_name)(char *filename, const char *expected_ext),
	const char *expected_ext
)
{
	struct stat stat_buf;
	IF_DESKTOP(long long) int status;
	char *filename, *new_name;
	smallint exitcode = 0;
	unpack_info_t info;

	do {
		/* NB: new_name is *maybe* malloc'ed! */
		new_name = NULL;
		filename = *argv; /* can be NULL - 'streaming' bunzip2 */

		if (filename && LONE_DASH(filename))
			filename = NULL;

		/* Open src */
		if (filename) {
			if (stat(filename, &stat_buf) != 0) {
				bb_simple_perror_msg(filename);
 err:
				exitcode = 1;
				goto free_name;
			}
			if (open_to_or_warn(STDIN_FILENO, filename, O_RDONLY, 0))
				goto err;
		}

		/* Special cases: test, stdout */
		if (option_mask32 & (OPT_STDOUT|OPT_TEST)) {
			if (option_mask32 & OPT_TEST)
				if (open_to_or_warn(STDOUT_FILENO, bb_dev_null, O_WRONLY, 0))
					goto err;
			filename = NULL;
		}

		/* Open dst if we are going to unpack to file */
		if (filename) {
			new_name = make_new_name(filename, expected_ext);
			if (!new_name) {
				bb_error_msg("%s: unknown suffix - ignored", filename);
				goto err;
			}

			/* -f: overwrite existing output files */
			if (option_mask32 & OPT_FORCE) {
				unlink(new_name);
			}

			/* O_EXCL: "real" bunzip2 doesn't overwrite files */
			/* GNU gunzip does not bail out, but goes to next file */
			if (open_to_or_warn(STDOUT_FILENO, new_name, O_WRONLY | O_CREAT | O_EXCL,
					stat_buf.st_mode))
				goto err;
		}

		/* Check that the input is sane */
		if (isatty(STDIN_FILENO) && (option_mask32 & OPT_FORCE) == 0) {
			bb_error_msg_and_die("compressed data not read from terminal, "
					"use -f to force it");
		}

		/* memset(&info, 0, sizeof(info)); */
		info.mtime = 0; /* so far it has one member only */
		status = unpacker(&info);
		if (status < 0)
			exitcode = 1;
		xclose(STDOUT_FILENO); /* with error check! */

		if (filename) {
			char *del = new_name;
			if (status >= 0) {
				/* TODO: restore other things? */
				if (info.mtime) {
					struct timeval times[2];

					times[1].tv_sec = times[0].tv_sec = info.mtime;
					times[1].tv_usec = times[0].tv_usec = 0;
					/* Note: we closed it first.
					 * On some systems calling utimes
					 * then closing resets the mtime
					 * back to current time. */
					utimes(new_name, times); /* ignoring errors */
				}

				/* Delete _compressed_ file */
				del = filename;
				/* restore extension (unless tgz -> tar case) */
				if (new_name == filename)
					filename[strlen(filename)] = '.';
			}
			xunlink(del);

#if 0 /* Currently buggy - wrong name: "a.gz: 261% - replaced with a.gz" */
			/* Extreme bloat for gunzip compat */
			if (ENABLE_DESKTOP && (option_mask32 & OPT_VERBOSE) && status >= 0) {
				fprintf(stderr, "%s: %u%% - replaced with %s\n",
					filename, (unsigned)(stat_buf.st_size*100 / (status+1)), new_name);
			}
#endif

 free_name:
			if (new_name != filename)
				free(new_name);
		}
	} while (*argv && *++argv);

	return exitcode;
}

#if ENABLE_UNCOMPRESS || ENABLE_BUNZIP2 || ENABLE_UNLZMA || ENABLE_UNXZ
static
char* FAST_FUNC make_new_name_generic(char *filename, const char *expected_ext)
{
	char *extension = strrchr(filename, '.');
	if (!extension || strcmp(extension + 1, expected_ext) != 0) {
		/* Mimic GNU gunzip - "real" bunzip2 tries to */
		/* unpack file anyway, to file.out */
		return NULL;
	}
	*extension = '\0';
	return filename;
}
#endif


/*
 * Uncompress applet for busybox (c) 2002 Glenn McGrath
 *
 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
 */
#if ENABLE_UNCOMPRESS
static
IF_DESKTOP(long long) int FAST_FUNC unpack_uncompress(unpack_info_t *info UNUSED_PARAM)
{
	IF_DESKTOP(long long) int status = -1;

	if ((xread_char(STDIN_FILENO) != 0x1f) || (xread_char(STDIN_FILENO) != 0x9d)) {
		bb_error_msg("invalid magic");
	} else {
		status = unpack_Z_stream(STDIN_FILENO, STDOUT_FILENO);
	}
	return status;
}
int uncompress_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int uncompress_main(int argc UNUSED_PARAM, char **argv)
{
	getopt32(argv, "cf");
	argv += optind;

	return bbunpack(argv, unpack_uncompress, make_new_name_generic, "Z");
}
#endif


/*
 * Gzip implementation for busybox
 *
 * Based on GNU gzip v1.2.4 Copyright (C) 1992-1993 Jean-loup Gailly.
 *
 * Originally adjusted for busybox by Sven Rudolph <sr1@inf.tu-dresden.de>
 * based on gzip sources
 *
 * Adjusted further by Erik Andersen <andersen@codepoet.org> to support files as
 * well as stdin/stdout, and to generally behave itself wrt command line
 * handling.
 *
 * General cleanup to better adhere to the style guide and make use of standard
 * busybox functions by Glenn McGrath
 *
 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
 *
 * gzip (GNU zip) -- compress files with zip algorithm and 'compress' interface
 * Copyright (C) 1992-1993 Jean-loup Gailly
 * The unzip code was written and put in the public domain by Mark Adler.
 * Portions of the lzw code are derived from the public domain 'compress'
 * written by Spencer Thomas, Joe Orost, James Woods, Jim McKie, Steve Davies,
 * Ken Turkowski, Dave Mack and Peter Jannesen.
 *
 * See the license_msg below and the file COPYING for the software license.
 * See the file algorithm.doc for the compression algorithms and file formats.
 */
#if ENABLE_GUNZIP
static
char* FAST_FUNC make_new_name_gunzip(char *filename, const char *expected_ext UNUSED_PARAM)
{
	char *extension = strrchr(filename, '.');

	if (!extension)
		return NULL;

	extension++;
	if (strcmp(extension, "tgz" + 1) == 0
#if ENABLE_FEATURE_SEAMLESS_Z
	 || (extension[0] == 'Z' && extension[1] == '\0')
#endif
	) {
		extension[-1] = '\0';
	} else if (strcmp(extension, "tgz") == 0) {
		filename = xstrdup(filename);
		extension = strrchr(filename, '.');
		extension[2] = 'a';
		extension[3] = 'r';
	} else {
		return NULL;
	}
	return filename;
}
static
IF_DESKTOP(long long) int FAST_FUNC unpack_gunzip(unpack_info_t *info)
{
	IF_DESKTOP(long long) int status = -1;

	/* do the decompression, and cleanup */
	if (xread_char(STDIN_FILENO) == 0x1f) {
		unsigned char magic2;

		magic2 = xread_char(STDIN_FILENO);
		if (ENABLE_FEATURE_SEAMLESS_Z && magic2 == 0x9d) {
			status = unpack_Z_stream(STDIN_FILENO, STDOUT_FILENO);
		} else if (magic2 == 0x8b) {
			status = unpack_gz_stream_with_info(STDIN_FILENO, STDOUT_FILENO, info);
		} else {
			goto bad_magic;
		}
		if (status < 0) {
			bb_error_msg("error inflating");
		}
	} else {
 bad_magic:
		bb_error_msg("invalid magic");
		/* status is still == -1 */
	}
	return status;
}
/*
 * Linux kernel build uses gzip -d -n. We accept and ignore it.
 * Man page says:
 * -n --no-name
 * gzip: do not save the original file name and time stamp.
 * (The original name is always saved if the name had to be truncated.)
 * gunzip: do not restore the original file name/time even if present
 * (remove only the gzip suffix from the compressed file name).
 * This option is the default when decompressing.
 * -N --name
 * gzip: always save the original file name and time stamp (this is the default)
 * gunzip: restore the original file name and time stamp if present.
 */
int gunzip_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int gunzip_main(int argc UNUSED_PARAM, char **argv)
{
	getopt32(argv, "cfvdtn");
	argv += optind;
	/* if called as zcat */
	if (applet_name[1] == 'c')
		option_mask32 |= OPT_STDOUT;

	return bbunpack(argv, unpack_gunzip, make_new_name_gunzip, /*unused:*/ NULL);
}
#endif


/*
 * Modified for busybox by Glenn McGrath
 * Added support output to stdout by Thomas Lundquist <thomasez@zelow.no>
 *
 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
 */
//usage:#define bunzip2_trivial_usage
//usage:       "[OPTIONS] [FILE]..."
//usage:#define bunzip2_full_usage "\n\n"
//usage:       "Decompress FILEs (or stdin)\n"
//usage:     "\nOptions:"
//usage:     "\n	-c	Write to stdout"
//usage:     "\n	-f	Force"
//usage:#define bzcat_trivial_usage
//usage:       "FILE"
//usage:#define bzcat_full_usage "\n\n"
//usage:       "Decompress to stdout"
//applet:IF_BUNZIP2(APPLET(bunzip2, _BB_DIR_USR_BIN, _BB_SUID_DROP))
//applet:IF_BUNZIP2(APPLET_ODDNAME(bzcat, bunzip2, _BB_DIR_USR_BIN, _BB_SUID_DROP, bzcat))
#if ENABLE_BUNZIP2
static
IF_DESKTOP(long long) int FAST_FUNC unpack_bunzip2(unpack_info_t *info UNUSED_PARAM)
{
	return unpack_bz2_stream_prime(STDIN_FILENO, STDOUT_FILENO);
}
int bunzip2_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int bunzip2_main(int argc UNUSED_PARAM, char **argv)
{
	getopt32(argv, "cfvdt");
	argv += optind;
	if (applet_name[2] == 'c') /* bzcat */
		option_mask32 |= OPT_STDOUT;

	return bbunpack(argv, unpack_bunzip2, make_new_name_generic, "bz2");
}
#endif


/*
 * Small lzma deflate implementation.
 * Copyright (C) 2006  Aurelien Jacobs <aurel@gnuage.org>
 *
 * Based on bunzip.c from busybox
 *
 * Licensed under GPL v2, see file LICENSE in this tarball for details.
 */
#if ENABLE_UNLZMA
static
IF_DESKTOP(long long) int FAST_FUNC unpack_unlzma(unpack_info_t *info UNUSED_PARAM)
{
	return unpack_lzma_stream(STDIN_FILENO, STDOUT_FILENO);
}
int unlzma_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int unlzma_main(int argc UNUSED_PARAM, char **argv)
{
	IF_LZMA(int opts =) getopt32(argv, "cfvdt");
# if ENABLE_LZMA
	/* lzma without -d or -t? */
	if (applet_name[2] == 'm' && !(opts & (OPT_DECOMPRESS|OPT_TEST)))
		bb_show_usage();
# endif
	/* lzcat? */
	if (applet_name[2] == 'c')
		option_mask32 |= OPT_STDOUT;

	argv += optind;
	return bbunpack(argv, unpack_unlzma, make_new_name_generic, "lzma");
}
#endif


#if ENABLE_UNXZ
static
IF_DESKTOP(long long) int FAST_FUNC unpack_unxz(unpack_info_t *info UNUSED_PARAM)
{
	struct {
		uint32_t v1;
		uint16_t v2;
	} magic;
	xread(STDIN_FILENO, &magic, 6);
	if (magic.v1 != XZ_MAGIC1a || magic.v2 != XZ_MAGIC2a) {
		bb_error_msg("invalid magic");
		return -1;
	}
	return unpack_xz_stream(STDIN_FILENO, STDOUT_FILENO);
}
int unxz_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int unxz_main(int argc UNUSED_PARAM, char **argv)
{
	IF_XZ(int opts =) getopt32(argv, "cfvdt");
# if ENABLE_XZ
	/* xz without -d or -t? */
	if (applet_name[2] == '\0' && !(opts & (OPT_DECOMPRESS|OPT_TEST)))
		bb_show_usage();
# endif
	/* xzcat? */
	if (applet_name[2] == 'c')
		option_mask32 |= OPT_STDOUT;

	argv += optind;
	return bbunpack(argv, unpack_unxz, make_new_name_generic, "xz");
}
#endif
1	niro	816	/* 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 tarball for details.
6			*/
7			#include "libbb.h"
8			#include "unarchive.h"
9
10			enum {
11	niro	1123	OPT_STDOUT = 1 << 0,
12			OPT_FORCE = 1 << 1,
13			/* only some decompressors: */
14			OPT_VERBOSE = 1 << 2,
15			OPT_DECOMPRESS = 1 << 3,
16			OPT_TEST = 1 << 4,
17	niro	816	};
18
19			static
20			int open_to_or_warn(int to_fd, const char *filename, int flags, int mode)
21			{
22			int fd = open3_or_warn(filename, flags, mode);
23			if (fd < 0) {
24			return 1;
25			}
26			xmove_fd(fd, to_fd);
27			return 0;
28			}
29
30	niro	1123	char* FAST_FUNC append_ext(char filename, const char expected_ext)
31			{
32			return xasprintf("%s.%s", filename, expected_ext);
33			}
34
35	niro	816	int FAST_FUNC bbunpack(char **argv,
36	niro	1123	IF_DESKTOP(long long) int FAST_FUNC (unpacker)(unpack_info_t info),
37			char* FAST_FUNC (make_new_name)(char filename, const char *expected_ext),
38			const char *expected_ext
39	niro	816	)
40			{
41			struct stat stat_buf;
42	niro	984	IF_DESKTOP(long long) int status;
43	niro	816	char filename, new_name;
44			smallint exitcode = 0;
45			unpack_info_t info;
46
47			do {
48			/* NB: new_name is maybe malloc'ed! */
49			new_name = NULL;
50			filename = argv; / can be NULL - 'streaming' bunzip2 */
51
52			if (filename && LONE_DASH(filename))
53			filename = NULL;
54
55			/* Open src */
56			if (filename) {
57			if (stat(filename, &stat_buf) != 0) {
58			bb_simple_perror_msg(filename);
59			err:
60			exitcode = 1;
61			goto free_name;
62			}
63			if (open_to_or_warn(STDIN_FILENO, filename, O_RDONLY, 0))
64			goto err;
65			}
66
67			/* Special cases: test, stdout */
68			if (option_mask32 & (OPT_STDOUT\|OPT_TEST)) {
69			if (option_mask32 & OPT_TEST)
70			if (open_to_or_warn(STDOUT_FILENO, bb_dev_null, O_WRONLY, 0))
71			goto err;
72			filename = NULL;
73			}
74
75			/* Open dst if we are going to unpack to file */
76			if (filename) {
77	niro	1123	new_name = make_new_name(filename, expected_ext);
78	niro	816	if (!new_name) {
79			bb_error_msg("%s: unknown suffix - ignored", filename);
80			goto err;
81			}
82
83			/* -f: overwrite existing output files */
84			if (option_mask32 & OPT_FORCE) {
85			unlink(new_name);
86			}
87
88			/* O_EXCL: "real" bunzip2 doesn't overwrite files */
89			/* GNU gunzip does not bail out, but goes to next file */
90			if (open_to_or_warn(STDOUT_FILENO, new_name, O_WRONLY \| O_CREAT \| O_EXCL,
91			stat_buf.st_mode))
92			goto err;
93			}
94
95			/* Check that the input is sane */
96			if (isatty(STDIN_FILENO) && (option_mask32 & OPT_FORCE) == 0) {
97			bb_error_msg_and_die("compressed data not read from terminal, "
98			"use -f to force it");
99			}
100
101			/* memset(&info, 0, sizeof(info)); */
102			info.mtime = 0; /* so far it has one member only */
103			status = unpacker(&info);
104			if (status < 0)
105			exitcode = 1;
106	niro	984	xclose(STDOUT_FILENO); /* with error check! */
107	niro	816
108			if (filename) {
109			char *del = new_name;
110			if (status >= 0) {
111			/* TODO: restore other things? */
112			if (info.mtime) {
113	niro	984	struct timeval times[2];
114	niro	816
115	niro	984	times[1].tv_sec = times[0].tv_sec = info.mtime;
116			times[1].tv_usec = times[0].tv_usec = 0;
117			/* Note: we closed it first.
118			* On some systems calling utimes
119			* then closing resets the mtime
120			* back to current time. */
121			utimes(new_name, times); /* ignoring errors */
122	niro	816	}
123
124			/* Delete _compressed_ file */
125			del = filename;
126			/* restore extension (unless tgz -> tar case) */
127			if (new_name == filename)
128			filename[strlen(filename)] = '.';
129			}
130			xunlink(del);
131
132			#if 0 /* Currently buggy - wrong name: "a.gz: 261% - replaced with a.gz" */
133			/* Extreme bloat for gunzip compat */
134			if (ENABLE_DESKTOP && (option_mask32 & OPT_VERBOSE) && status >= 0) {
135			fprintf(stderr, "%s: %u%% - replaced with %s\n",
136			filename, (unsigned)(stat_buf.st_size*100 / (status+1)), new_name);
137			}
138			#endif
139
140			free_name:
141			if (new_name != filename)
142			free(new_name);
143			}
144			} while (argv && ++argv);
145
146			return exitcode;
147			}
148
149	niro	1123	#if ENABLE_UNCOMPRESS \|\| ENABLE_BUNZIP2 \|\| ENABLE_UNLZMA \|\| ENABLE_UNXZ
150	niro	816	static
151	niro	1123	char* FAST_FUNC make_new_name_generic(char filename, const char expected_ext)
152	niro	816	{
153			char *extension = strrchr(filename, '.');
154			if (!extension \|\| strcmp(extension + 1, expected_ext) != 0) {
155			/* Mimic GNU gunzip - "real" bunzip2 tries to */
156			/* unpack file anyway, to file.out */
157			return NULL;
158			}
159			*extension = '\0';
160			return filename;
161			}
162			#endif
163
164
165			/*
166	niro	1123	* Uncompress applet for busybox (c) 2002 Glenn McGrath
167	niro	816	*
168	niro	1123	* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
169	niro	816	*/
170	niro	1123	#if ENABLE_UNCOMPRESS
171	niro	816	static
172	niro	1123	IF_DESKTOP(long long) int FAST_FUNC unpack_uncompress(unpack_info_t *info UNUSED_PARAM)
173	niro	816	{
174	niro	1123	IF_DESKTOP(long long) int status = -1;
175	niro	816
176	niro	1123	if ((xread_char(STDIN_FILENO) != 0x1f) \|\| (xread_char(STDIN_FILENO) != 0x9d)) {
177			bb_error_msg("invalid magic");
178			} else {
179			status = unpack_Z_stream(STDIN_FILENO, STDOUT_FILENO);
180			}
181			return status;
182	niro	816	}
183	niro	1123	int uncompress_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
184			int uncompress_main(int argc UNUSED_PARAM, char **argv)
185	niro	816	{
186	niro	1123	getopt32(argv, "cf");
187	niro	816	argv += optind;
188
189	niro	1123	return bbunpack(argv, unpack_uncompress, make_new_name_generic, "Z");
190	niro	816	}
191			#endif
192
193
194			/*
195			* Gzip implementation for busybox
196			*
197			* Based on GNU gzip v1.2.4 Copyright (C) 1992-1993 Jean-loup Gailly.
198			*
199			* Originally adjusted for busybox by Sven Rudolph <sr1@inf.tu-dresden.de>
200			* based on gzip sources
201			*
202			* Adjusted further by Erik Andersen <andersen@codepoet.org> to support files as
203			* well as stdin/stdout, and to generally behave itself wrt command line
204			* handling.
205			*
206			* General cleanup to better adhere to the style guide and make use of standard
207			* busybox functions by Glenn McGrath
208			*
209			* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
210			*
211			* gzip (GNU zip) -- compress files with zip algorithm and 'compress' interface
212			* Copyright (C) 1992-1993 Jean-loup Gailly
213			* The unzip code was written and put in the public domain by Mark Adler.
214			* Portions of the lzw code are derived from the public domain 'compress'
215			* written by Spencer Thomas, Joe Orost, James Woods, Jim McKie, Steve Davies,
216			* Ken Turkowski, Dave Mack and Peter Jannesen.
217			*
218			* See the license_msg below and the file COPYING for the software license.
219			* See the file algorithm.doc for the compression algorithms and file formats.
220			*/
221			#if ENABLE_GUNZIP
222			static
223	niro	1123	char* FAST_FUNC make_new_name_gunzip(char filename, const char expected_ext UNUSED_PARAM)
224	niro	816	{
225			char *extension = strrchr(filename, '.');
226
227			if (!extension)
228			return NULL;
229
230			extension++;
231			if (strcmp(extension, "tgz" + 1) == 0
232			#if ENABLE_FEATURE_SEAMLESS_Z
233			\|\| (extension[0] == 'Z' && extension[1] == '\0')
234			#endif
235			) {
236			extension[-1] = '\0';
237			} else if (strcmp(extension, "tgz") == 0) {
238			filename = xstrdup(filename);
239			extension = strrchr(filename, '.');
240			extension[2] = 'a';
241			extension[3] = 'r';
242			} else {
243			return NULL;
244			}
245			return filename;
246			}
247			static
248	niro	1123	IF_DESKTOP(long long) int FAST_FUNC unpack_gunzip(unpack_info_t *info)
249	niro	816	{
250	niro	984	IF_DESKTOP(long long) int status = -1;
251	niro	816
252			/* do the decompression, and cleanup */
253			if (xread_char(STDIN_FILENO) == 0x1f) {
254			unsigned char magic2;
255
256			magic2 = xread_char(STDIN_FILENO);
257			if (ENABLE_FEATURE_SEAMLESS_Z && magic2 == 0x9d) {
258			status = unpack_Z_stream(STDIN_FILENO, STDOUT_FILENO);
259			} else if (magic2 == 0x8b) {
260			status = unpack_gz_stream_with_info(STDIN_FILENO, STDOUT_FILENO, info);
261			} else {
262			goto bad_magic;
263			}
264			if (status < 0) {
265			bb_error_msg("error inflating");
266			}
267			} else {
268			bad_magic:
269			bb_error_msg("invalid magic");
270			/* status is still == -1 */
271			}
272			return status;
273			}
274			/*
275			* Linux kernel build uses gzip -d -n. We accept and ignore it.
276			* Man page says:
277			* -n --no-name
278			* gzip: do not save the original file name and time stamp.
279			* (The original name is always saved if the name had to be truncated.)
280			* gunzip: do not restore the original file name/time even if present
281			* (remove only the gzip suffix from the compressed file name).
282			* This option is the default when decompressing.
283			* -N --name
284			* gzip: always save the original file name and time stamp (this is the default)
285			* gunzip: restore the original file name and time stamp if present.
286			*/
287			int gunzip_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
288			int gunzip_main(int argc UNUSED_PARAM, char **argv)
289			{
290			getopt32(argv, "cfvdtn");
291			argv += optind;
292			/* if called as zcat */
293			if (applet_name[1] == 'c')
294			option_mask32 \|= OPT_STDOUT;
295
296	niro	1123	return bbunpack(argv, unpack_gunzip, make_new_name_gunzip, /unused:/ NULL);
297	niro	816	}
298	niro	1123	#endif
299	niro	816
300	niro	1123
301			/*
302			* Modified for busybox by Glenn McGrath
303			* Added support output to stdout by Thomas Lundquist <thomasez@zelow.no>
304			*
305			* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
306			*/
307			//usage:#define bunzip2_trivial_usage
308			//usage: "[OPTIONS] [FILE]..."
309			//usage:#define bunzip2_full_usage "\n\n"
310			//usage: "Decompress FILEs (or stdin)\n"
311			//usage: "\nOptions:"
312			//usage: "\n -c Write to stdout"
313			//usage: "\n -f Force"
314			//usage:#define bzcat_trivial_usage
315			//usage: "FILE"
316			//usage:#define bzcat_full_usage "\n\n"
317			//usage: "Decompress to stdout"
318			//applet:IF_BUNZIP2(APPLET(bunzip2, _BB_DIR_USR_BIN, _BB_SUID_DROP))
319			//applet:IF_BUNZIP2(APPLET_ODDNAME(bzcat, bunzip2, _BB_DIR_USR_BIN, _BB_SUID_DROP, bzcat))
320			#if ENABLE_BUNZIP2
321			static
322			IF_DESKTOP(long long) int FAST_FUNC unpack_bunzip2(unpack_info_t *info UNUSED_PARAM)
323			{
324			return unpack_bz2_stream_prime(STDIN_FILENO, STDOUT_FILENO);
325			}
326			int bunzip2_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
327			int bunzip2_main(int argc UNUSED_PARAM, char **argv)
328			{
329			getopt32(argv, "cfvdt");
330			argv += optind;
331			if (applet_name[2] == 'c') /* bzcat */
332			option_mask32 \|= OPT_STDOUT;
333
334			return bbunpack(argv, unpack_bunzip2, make_new_name_generic, "bz2");
335			}
336	niro	816	#endif
337
338
339			/*
340			* Small lzma deflate implementation.
341			* Copyright (C) 2006 Aurelien Jacobs <aurel@gnuage.org>
342			*
343			* Based on bunzip.c from busybox
344			*
345			* Licensed under GPL v2, see file LICENSE in this tarball for details.
346			*/
347			#if ENABLE_UNLZMA
348			static
349	niro	1123	IF_DESKTOP(long long) int FAST_FUNC unpack_unlzma(unpack_info_t *info UNUSED_PARAM)
350	niro	816	{
351			return unpack_lzma_stream(STDIN_FILENO, STDOUT_FILENO);
352			}
353			int unlzma_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
354			int unlzma_main(int argc UNUSED_PARAM, char **argv)
355			{
356	niro	1123	IF_LZMA(int opts =) getopt32(argv, "cfvdt");
357			# if ENABLE_LZMA
358			/* lzma without -d or -t? */
359			if (applet_name[2] == 'm' && !(opts & (OPT_DECOMPRESS\|OPT_TEST)))
360			bb_show_usage();
361			# endif
362			/* lzcat? */
363			if (applet_name[2] == 'c')
364	niro	816	option_mask32 \|= OPT_STDOUT;
365
366	niro	1123	argv += optind;
367			return bbunpack(argv, unpack_unlzma, make_new_name_generic, "lzma");
368	niro	816	}
369			#endif
370
371
372	niro	1123	#if ENABLE_UNXZ
373	niro	816	static
374	niro	1123	IF_DESKTOP(long long) int FAST_FUNC unpack_unxz(unpack_info_t *info UNUSED_PARAM)
375	niro	816	{
376	niro	1123	struct {
377			uint32_t v1;
378			uint16_t v2;
379			} magic;
380			xread(STDIN_FILENO, &magic, 6);
381			if (magic.v1 != XZ_MAGIC1a \|\| magic.v2 != XZ_MAGIC2a) {
382	niro	816	bb_error_msg("invalid magic");
383	niro	1123	return -1;
384	niro	816	}
385	niro	1123	return unpack_xz_stream(STDIN_FILENO, STDOUT_FILENO);
386	niro	816	}
387	niro	1123	int unxz_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
388			int unxz_main(int argc UNUSED_PARAM, char **argv)
389			{
390			IF_XZ(int opts =) getopt32(argv, "cfvdt");
391			# if ENABLE_XZ
392			/* xz without -d or -t? */
393			if (applet_name[2] == '\0' && !(opts & (OPT_DECOMPRESS\|OPT_TEST)))
394			bb_show_usage();
395			# endif
396			/* xzcat? */
397			if (applet_name[2] == 'c')
398			option_mask32 \|= OPT_STDOUT;
399	niro	816
400			argv += optind;
401	niro	1123	return bbunpack(argv, unpack_unxz, make_new_name_generic, "xz");
402	niro	816	}
403			#endif