archival/bbunzip.c - codeaurora/busybox - Gitiles

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

 /* Note: must be kept in sync with archival/lzop.c */
 enum {
 	OPT_STDOUT     = 1 << 0,
 	OPT_FORCE      = 1 << 1,
 	/* only some decompressors: */
 	OPT_VERBOSE    = 1 << 2,
 	OPT_QUIET      = 1 << 3,
 	OPT_DECOMPRESS = 1 << 4,
 	OPT_TEST       = 1 << 5,
 	SEAMLESS_MAGIC = (1 << 31) * SEAMLESS_COMPRESSION,
 };

 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)(transformer_aux_data_t *aux),
 	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 = 0;
 	char *filename, *new_name;
 	smallint exitcode = 0;
 	transformer_aux_data_t aux;

 	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 (!(option_mask32 & SEAMLESS_MAGIC)) {
 				if (stat(filename, &stat_buf) != 0) {
  err_name:
 					bb_simple_perror_msg(filename);
  err:
 					exitcode = 1;
 					goto free_name;
 				}
 				if (open_to_or_warn(STDIN_FILENO, filename, O_RDONLY, 0))
 					goto err;
 			} else {
 				/* "clever zcat" with FILE */
 				int fd = open_zipped(filename);
 				if (fd < 0)
 					goto err_name;
 				xmove_fd(fd, STDIN_FILENO);
 			}
 		} else
 		if (option_mask32 & SEAMLESS_MAGIC) {
 			/* "clever zcat" on stdin */
 			if (setup_unzip_on_fd(STDIN_FILENO, /*fail_if_not_detected*/ 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))
 					xfunc_die();
 			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 (!(option_mask32 & OPT_FORCE) && isatty(STDIN_FILENO)) {
 			bb_error_msg_and_die("compressed data not read from terminal, "
 					"use -f to force it");
 		}

 		if (!(option_mask32 & SEAMLESS_MAGIC)) {
 			init_transformer_aux_data(&aux);
 			aux.check_signature = 1;
 			status = unpacker(&aux);
 			if (status < 0)
 				exitcode = 1;
 		} else {
 			if (bb_copyfd_eof(STDIN_FILENO, STDOUT_FILENO) < 0)
 				/* Disk full, tty closed, etc. No point in continuing */
 				xfunc_die();
 		}

 		if (!(option_mask32 & OPT_STDOUT))
 			xclose(STDOUT_FILENO); /* with error check! */

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

 					times[1].tv_sec = times[0].tv_sec = aux.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);

 	if (option_mask32 & OPT_STDOUT)
 		xclose(STDOUT_FILENO); /* with error check! */

 	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 source tree.
  */

 //usage:#define uncompress_trivial_usage
 //usage:       "[-cf] [FILE]..."
 //usage:#define uncompress_full_usage "\n\n"
 //usage:       "Decompress .Z file[s]\n"
 //usage:     "\n	-c	Write to stdout"
 //usage:     "\n	-f	Overwrite"

 #if ENABLE_UNCOMPRESS
 static
 IF_DESKTOP(long long) int FAST_FUNC unpack_uncompress(transformer_aux_data_t *aux)
 {
 	return unpack_Z_stream(aux, STDIN_FILENO, STDOUT_FILENO);
 }
 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 source tree.
  *
  * 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.
  */

 //usage:#define gunzip_trivial_usage
 //usage:       "[-cft] [FILE]..."
 //usage:#define gunzip_full_usage "\n\n"
 //usage:       "Decompress FILEs (or stdin)\n"
 //usage:     "\n	-c	Write to stdout"
 //usage:     "\n	-f	Force"
 //usage:     "\n	-t	Test file integrity"
 //usage:
 //usage:#define gunzip_example_usage
 //usage:       "$ ls -la /tmp/BusyBox*\n"
 //usage:       "-rw-rw-r--    1 andersen andersen   557009 Apr 11 10:55 /tmp/BusyBox-0.43.tar.gz\n"
 //usage:       "$ gunzip /tmp/BusyBox-0.43.tar.gz\n"
 //usage:       "$ ls -la /tmp/BusyBox*\n"
 //usage:       "-rw-rw-r--    1 andersen andersen  1761280 Apr 14 17:47 /tmp/BusyBox-0.43.tar\n"
 //usage:
 //usage:#define zcat_trivial_usage
 //usage:       "[FILE]..."
 //usage:#define zcat_full_usage "\n\n"
 //usage:       "Decompress to stdout"

 #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(transformer_aux_data_t *aux)
 {
 	return unpack_gz_stream(aux, STDIN_FILENO, STDOUT_FILENO);
 }
 /*
  * 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, "cfvqdtn");
 	argv += optind;

 	/* If called as zcat...
 	 * Normally, "zcat" is just "gunzip -c".
 	 * But if seamless magic is enabled, then we are much more clever.
 	 */
 	if (applet_name[1] == 'c')
 		option_mask32 |= OPT_STDOUT | SEAMLESS_MAGIC;

 	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 source tree.
  */
 //usage:#define bunzip2_trivial_usage
 //usage:       "[-cf] [FILE]..."
 //usage:#define bunzip2_full_usage "\n\n"
 //usage:       "Decompress FILEs (or stdin)\n"
 //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(transformer_aux_data_t *aux)
 {
 	return unpack_bz2_stream(aux, 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, "cfvqdt");
 	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 GPLv2, see file LICENSE in this source tree.
  */

 //usage:#define unlzma_trivial_usage
 //usage:       "[-cf] [FILE]..."
 //usage:#define unlzma_full_usage "\n\n"
 //usage:       "Decompress FILE (or stdin)\n"
 //usage:     "\n	-c	Write to stdout"
 //usage:     "\n	-f	Force"
 //usage:
 //usage:#define lzma_trivial_usage
 //usage:       "-d [-cf] [FILE]..."
 //usage:#define lzma_full_usage "\n\n"
 //usage:       "Decompress FILE (or stdin)\n"
 //usage:     "\n	-d	Decompress"
 //usage:     "\n	-c	Write to stdout"
 //usage:     "\n	-f	Force"
 //usage:
 //usage:#define lzcat_trivial_usage
 //usage:       "[FILE]..."
 //usage:#define lzcat_full_usage "\n\n"
 //usage:       "Decompress to stdout"
 //usage:
 //usage:#define unxz_trivial_usage
 //usage:       "[-cf] [FILE]..."
 //usage:#define unxz_full_usage "\n\n"
 //usage:       "Decompress FILE (or stdin)\n"
 //usage:     "\n	-c	Write to stdout"
 //usage:     "\n	-f	Force"
 //usage:
 //usage:#define xz_trivial_usage
 //usage:       "-d [-cf] [FILE]..."
 //usage:#define xz_full_usage "\n\n"
 //usage:       "Decompress FILE (or stdin)\n"
 //usage:     "\n	-d	Decompress"
 //usage:     "\n	-c	Write to stdout"
 //usage:     "\n	-f	Force"
 //usage:
 //usage:#define xzcat_trivial_usage
 //usage:       "[FILE]..."
 //usage:#define xzcat_full_usage "\n\n"
 //usage:       "Decompress to stdout"

 #if ENABLE_UNLZMA
 static
 IF_DESKTOP(long long) int FAST_FUNC unpack_unlzma(transformer_aux_data_t *aux)
 {
 	return unpack_lzma_stream(aux, 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, "cfvqdt");
 # 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(transformer_aux_data_t *aux)
 {
 	return unpack_xz_stream(aux, 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, "cfvqdt");
 # 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
	/* vi: set sw=4 ts=4: */
	/*
	* Common code for gunzip-like applets
	*
	* Licensed under GPLv2 or later, see file LICENSE in this source tree.
	*/
	#include "libbb.h"
	#include "bb_archive.h"

	/* Note: must be kept in sync with archival/lzop.c */
	enum {
	OPT_STDOUT = 1 << 0,
	OPT_FORCE = 1 << 1,
	/* only some decompressors: */
	OPT_VERBOSE = 1 << 2,
	OPT_QUIET = 1 << 3,
	OPT_DECOMPRESS = 1 << 4,
	OPT_TEST = 1 << 5,
	SEAMLESS_MAGIC = (1 << 31) * SEAMLESS_COMPRESSION,
	};

	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)(transformer_aux_data_t aux),
	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 = 0;
	char filename, new_name;
	smallint exitcode = 0;
	transformer_aux_data_t aux;

	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 (!(option_mask32 & SEAMLESS_MAGIC)) {
	if (stat(filename, &stat_buf) != 0) {
	err_name:
	bb_simple_perror_msg(filename);
	err:
	exitcode = 1;
	goto free_name;
	}
	if (open_to_or_warn(STDIN_FILENO, filename, O_RDONLY, 0))
	goto err;
	} else {
	/* "clever zcat" with FILE */
	int fd = open_zipped(filename);
	if (fd < 0)
	goto err_name;
	xmove_fd(fd, STDIN_FILENO);
	}
	} else
	if (option_mask32 & SEAMLESS_MAGIC) {
	/* "clever zcat" on stdin */
	if (setup_unzip_on_fd(STDIN_FILENO, /fail_if_not_detected/ 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))
	xfunc_die();
	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 (!(option_mask32 & OPT_FORCE) && isatty(STDIN_FILENO)) {
	bb_error_msg_and_die("compressed data not read from terminal, "
	"use -f to force it");
	}

	if (!(option_mask32 & SEAMLESS_MAGIC)) {
	init_transformer_aux_data(&aux);
	aux.check_signature = 1;
	status = unpacker(&aux);
	if (status < 0)
	exitcode = 1;
	} else {
	if (bb_copyfd_eof(STDIN_FILENO, STDOUT_FILENO) < 0)
	/* Disk full, tty closed, etc. No point in continuing */
	xfunc_die();
	}

	if (!(option_mask32 & OPT_STDOUT))
	xclose(STDOUT_FILENO); /* with error check! */

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

	times[1].tv_sec = times[0].tv_sec = aux.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);

	if (option_mask32 & OPT_STDOUT)
	xclose(STDOUT_FILENO); /* with error check! */

	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 source tree.
	*/

	//usage:#define uncompress_trivial_usage
	//usage: "[-cf] [FILE]..."
	//usage:#define uncompress_full_usage "\n\n"
	//usage: "Decompress .Z file[s]\n"
	//usage: "\n -c Write to stdout"
	//usage: "\n -f Overwrite"

	#if ENABLE_UNCOMPRESS
	static
	IF_DESKTOP(long long) int FAST_FUNC unpack_uncompress(transformer_aux_data_t *aux)
	{
	return unpack_Z_stream(aux, STDIN_FILENO, STDOUT_FILENO);
	}
	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 source tree.
	*
	* 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.
	*/

	//usage:#define gunzip_trivial_usage
	//usage: "[-cft] [FILE]..."
	//usage:#define gunzip_full_usage "\n\n"
	//usage: "Decompress FILEs (or stdin)\n"
	//usage: "\n -c Write to stdout"
	//usage: "\n -f Force"
	//usage: "\n -t Test file integrity"
	//usage:
	//usage:#define gunzip_example_usage
	//usage: "$ ls -la /tmp/BusyBox*\n"
	//usage: "-rw-rw-r-- 1 andersen andersen 557009 Apr 11 10:55 /tmp/BusyBox-0.43.tar.gz\n"
	//usage: "$ gunzip /tmp/BusyBox-0.43.tar.gz\n"
	//usage: "$ ls -la /tmp/BusyBox*\n"
	//usage: "-rw-rw-r-- 1 andersen andersen 1761280 Apr 14 17:47 /tmp/BusyBox-0.43.tar\n"
	//usage:
	//usage:#define zcat_trivial_usage
	//usage: "[FILE]..."
	//usage:#define zcat_full_usage "\n\n"
	//usage: "Decompress to stdout"

	#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(transformer_aux_data_t *aux)
	{
	return unpack_gz_stream(aux, STDIN_FILENO, STDOUT_FILENO);
	}
	/*
	* 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, "cfvqdtn");
	argv += optind;

	/* If called as zcat...
	* Normally, "zcat" is just "gunzip -c".
	* But if seamless magic is enabled, then we are much more clever.
	*/
	if (applet_name[1] == 'c')
	option_mask32 \|= OPT_STDOUT \| SEAMLESS_MAGIC;

	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 source tree.
	*/
	//usage:#define bunzip2_trivial_usage
	//usage: "[-cf] [FILE]..."
	//usage:#define bunzip2_full_usage "\n\n"
	//usage: "Decompress FILEs (or stdin)\n"
	//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(transformer_aux_data_t *aux)
	{
	return unpack_bz2_stream(aux, 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, "cfvqdt");
	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 GPLv2, see file LICENSE in this source tree.
	*/

	//usage:#define unlzma_trivial_usage
	//usage: "[-cf] [FILE]..."
	//usage:#define unlzma_full_usage "\n\n"
	//usage: "Decompress FILE (or stdin)\n"
	//usage: "\n -c Write to stdout"
	//usage: "\n -f Force"
	//usage:
	//usage:#define lzma_trivial_usage
	//usage: "-d [-cf] [FILE]..."
	//usage:#define lzma_full_usage "\n\n"
	//usage: "Decompress FILE (or stdin)\n"
	//usage: "\n -d Decompress"
	//usage: "\n -c Write to stdout"
	//usage: "\n -f Force"
	//usage:
	//usage:#define lzcat_trivial_usage
	//usage: "[FILE]..."
	//usage:#define lzcat_full_usage "\n\n"
	//usage: "Decompress to stdout"
	//usage:
	//usage:#define unxz_trivial_usage
	//usage: "[-cf] [FILE]..."
	//usage:#define unxz_full_usage "\n\n"
	//usage: "Decompress FILE (or stdin)\n"
	//usage: "\n -c Write to stdout"
	//usage: "\n -f Force"
	//usage:
	//usage:#define xz_trivial_usage
	//usage: "-d [-cf] [FILE]..."
	//usage:#define xz_full_usage "\n\n"
	//usage: "Decompress FILE (or stdin)\n"
	//usage: "\n -d Decompress"
	//usage: "\n -c Write to stdout"
	//usage: "\n -f Force"
	//usage:
	//usage:#define xzcat_trivial_usage
	//usage: "[FILE]..."
	//usage:#define xzcat_full_usage "\n\n"
	//usage: "Decompress to stdout"

	#if ENABLE_UNLZMA
	static
	IF_DESKTOP(long long) int FAST_FUNC unpack_unlzma(transformer_aux_data_t *aux)
	{
	return unpack_lzma_stream(aux, 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, "cfvqdt");
	# 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(transformer_aux_data_t *aux)
	{
	return unpack_xz_stream(aux, 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, "cfvqdt");
	# 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