1 /* vi: set sw=4 ts=4: */
3 * Gzip implementation for busybox
5 * Based on GNU gzip v1.2.4 Copyright (C) 1992-1993 Jean-loup Gailly.
7 * Originally adjusted for busybox by Sven Rudolph <sr1@inf.tu-dresden.de>
8 * based on gzip sources
10 * Adjusted further by Erik Andersen <andersee@debian.org> to support files as
11 * well as stdin/stdout, and to generally behave itself wrt command line
14 * General cleanup to better adhere to the style guide and make use of standard
15 * busybox functions by Glenn McGrath <bug1@optushome.com.au>
17 * This program is free software; you can redistribute it and/or modify
18 * it under the terms of the GNU General Public License as published by
19 * the Free Software Foundation; either version 2 of the License, or
20 * (at your option) any later version.
22 * This program is distributed in the hope that it will be useful,
23 * but WITHOUT ANY WARRANTY; without even the implied warranty of
24 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
25 * General Public License for more details.
27 * You should have received a copy of the GNU General Public License
28 * along with this program; if not, write to the Free Software
29 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
32 * gzip (GNU zip) -- compress files with zip algorithm and 'compress' interface
33 * Copyright (C) 1992-1993 Jean-loup Gailly
34 * The unzip code was written and put in the public domain by Mark Adler.
35 * Portions of the lzw code are derived from the public domain 'compress'
36 * written by Spencer Thomas, Joe Orost, James Woods, Jim McKie, Steve Davies,
37 * Ken Turkowski, Dave Mack and Peter Jannesen.
39 * See the license_msg below and the file COPYING for the software license.
40 * See the file algorithm.doc for the compression algorithms and file formats.
44 static char *license_msg[] = {
45 " Copyright (C) 1992-1993 Jean-loup Gailly",
46 " This program is free software; you can redistribute it and/or modify",
47 " it under the terms of the GNU General Public License as published by",
48 " the Free Software Foundation; either version 2, or (at your option)",
49 " any later version.",
51 " This program is distributed in the hope that it will be useful,",
52 " but WITHOUT ANY WARRANTY; without even the implied warranty of",
53 " MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the",
54 " GNU General Public License for more details.",
56 " You should have received a copy of the GNU General Public License",
57 " along with this program; if not, write to the Free Software",
58 " Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.",
69 const char gunzip_to_stdout = 1;
70 const char gunzip_force = 2;
71 const char gunzip_test = 4;
73 extern int gunzip_main(int argc, char **argv)
75 char status = EXIT_SUCCESS;
79 /* if called as zcat */
80 if (strcmp(applet_name, "zcat") == 0) {
81 flags |= gunzip_to_stdout;
84 while ((opt = getopt(argc, argv, "ctfhd")) != -1) {
87 flags |= gunzip_to_stdout;
90 flags |= gunzip_force;
95 case 'd': /* Used to convert gzip to gunzip. */
98 show_usage(); /* exit's inside usage */
103 FILE *in_file, *out_file;
104 struct stat stat_buf;
105 const char *old_path = argv[optind];
106 const char *delete_path = NULL;
107 char *new_path = NULL;
111 if (old_path == NULL || strcmp(old_path, "-") == 0) {
113 flags |= gunzip_to_stdout;
115 in_file = wfopen(old_path, "r");
116 if (in_file == NULL) {
117 status = EXIT_FAILURE;
121 /* Get the time stamp on the input file. */
122 if (stat(old_path, &stat_buf) < 0) {
123 error_msg_and_die("Couldn't stat file %s", old_path);
127 /* Check that the input is sane. */
128 if (isatty(fileno(in_file)) && ((flags & gunzip_force) == 0)) {
130 ("compressed data not read from terminal. Use -f to force it.");
133 /* Set output filename and number */
134 if (flags & gunzip_test) {
135 out_file = xfopen("/dev/null", "w"); /* why does test use filenum 2 ? */
136 } else if (flags & gunzip_to_stdout) {
141 new_path = xstrdup(old_path);
143 extension = strrchr(new_path, '.');
144 if (extension && (strcmp(extension, ".gz") == 0)) {
146 } else if (extension && (strcmp(extension, ".tgz") == 0)) {
150 error_msg_and_die("Invalid extension");
153 /* Open output file */
154 out_file = xfopen(new_path, "w");
156 /* Set permissions on the file */
157 chmod(old_path, stat_buf.st_mode);
159 /* If unzip succeeds remove the old file */
160 delete_path = old_path;
163 /* do the decompression, and cleanup */
164 if ((unzip(in_file, out_file) != 0) && (new_path)) {
165 /* Unzip failed, remove new path instead of old path */
166 delete_path = new_path;
169 if (out_file != stdout) {
172 if (in_file != stdin) {
176 /* delete_path will be NULL if in test mode or from stdin */
177 if (delete_path && (unlink(delete_path) == -1)) {
178 error_msg_and_die("Couldn't remove %s", delete_path);
183 } while (optind < argc);