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 <andersen@lineo.com>, <andersee@debian.org>
11 * to support files as well as stdin/stdout, and to generally behave itself wrt
12 * command line handling.
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.",
68 #define BB_DECLARE_EXTERN
69 #define bb_need_memory_exhausted
70 #define bb_need_name_too_long
73 extern int gunzip_main(int argc, char **argv)
75 FILE *in_file, *out_file;
80 char *delete_file_name = NULL;
82 const int gunzip_to_stdout = 1;
83 const int gunzip_force = 2;
84 const int gunzip_test = 4;
88 int delete_old_file = FALSE;
90 /* if called as zcat */
91 if (strcmp(applet_name, "zcat") == 0)
92 flags |= gunzip_to_stdout;
94 while ((opt = getopt(argc, argv, "ctfhd")) != -1) {
97 flags |= gunzip_to_stdout;
100 flags |= gunzip_force;
103 flags |= gunzip_test;
105 case 'd': /* Used to convert gzip to gunzip. */
109 show_usage(); /* exit's inside usage */
113 /* Set input filename and number */
114 if (argv[optind] == NULL) {
115 flags |= gunzip_to_stdout;
118 if_name = strdup(argv[optind]);
119 /* Open input file */
120 in_file = xfopen(if_name, "r");
122 /* Get the time stamp on the input file. */
123 if (stat(if_name, &stat_buf) < 0) {
124 error_msg_and_die("Couldn't stat file %s", if_name);
128 /* Check that the input is sane. */
129 if (isatty(fileno(in_file)) && (flags & gunzip_force) == 0)
130 error_msg_and_die("compressed data not read from terminal. Use -f to force it.");
132 /* Set output filename and number */
133 if (flags & gunzip_test) {
134 out_file = xfopen("/dev/null", "w"); /* why does test use filenum 2 ? */
135 } else if (flags & gunzip_to_stdout) {
139 int length = strlen(if_name);
141 delete_old_file = TRUE;
142 extension = strrchr(if_name, '.');
143 if (extension && strcmp(extension, ".gz") == 0) {
145 } else if (extension && strcmp(extension, ".tgz") == 0) {
148 error_msg_and_die("Invalid extension");
150 of_name = (char *) xcalloc(sizeof(char), length + 1);
151 strncpy(of_name, if_name, length);
153 /* Open output file */
154 out_file = xfopen(of_name, "w");
156 /* Set permissions on the file */
157 chmod(of_name, stat_buf.st_mode);
160 /* do the decompression, and cleanup */
161 if (unzip(in_file, out_file) == 0) {
162 /* Success, remove .gz file */
163 delete_file_name = if_name;
165 /* remove failed attempt */
166 delete_file_name = of_name;
172 if (delete_old_file == TRUE) {
173 if (unlink(delete_file_name) < 0) {
174 error_msg_and_die("Couldnt remove %s", delete_file_name);
180 return(EXIT_SUCCESS);