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_from_stdin = 2;
84 const int gunzip_force = 4;
85 const int gunzip_test = 8;
89 int delete_old_file = FALSE;
91 /* if called as zcat */
92 if (strcmp(applet_name, "zcat") == 0) {
97 /* a filename was specified */
98 flags |= (gunzip_to_stdout | gunzip_force);
101 /* read from stdin, this gets caught below as argv[optind] will be NULL */
105 /* workout flags as regular gunzip */
106 while ((opt = getopt(argc, argv, "ctfh")) != -1) {
109 flags |= gunzip_to_stdout;
112 flags |= gunzip_force;
115 flags |= gunzip_test;
119 show_usage(); /* exit's inside usage */
124 /* no filename specified so it must be reading from stdin to stdout */
125 if (argv[optind] == NULL) {
126 flags |= (gunzip_from_stdin |gunzip_to_stdout |gunzip_force);
129 /* Set input filename and number */
130 if (flags & gunzip_from_stdin) {
132 if ((flags & gunzip_force) == 0) {
133 error_msg_and_die("data not written to terminal. Use -f to force it.");
136 if_name = strdup(argv[optind]);
137 /* Open input file */
138 in_file = xfopen(if_name, "r");
140 /* Get the time stamp on the input file. */
141 if (stat(if_name, &stat_buf) < 0) {
142 error_msg_and_die("Couldnt stat file %s",if_name);
146 /* Set output filename and number */
147 if (flags & gunzip_to_stdout) {
149 /* whats the best way to do this with streams ? */
150 if (isatty(fileno(out_file)) && ((flags & gunzip_force) == 0)) {
151 error_msg_and_die("data not written to terminal. Use -f to force it.");
153 } else if (flags & gunzip_test) {
154 out_file = xfopen("/dev/null", "w"); /* why does test use filenum 2 ? */
157 int length = strlen(if_name);
159 delete_old_file = TRUE;
160 extension = strrchr(if_name, '.');
161 if (strcmp(extension, ".gz") == 0) {
163 } else if (strcmp(extension, ".tgz") == 0) {
166 error_msg_and_die("Invalid extension");
168 of_name = (char *) xcalloc(sizeof(char), length + 1);
169 strncpy(of_name, if_name, length);
171 /* Open output file */
172 out_file = xfopen(of_name, "w");
174 /* Set permissions on the file */
175 chmod(of_name, stat_buf.st_mode);
178 /* do the decompression, and cleanup */
179 if (unzip(in_file, out_file) == 0) {
180 /* Success, remove .gz file */
181 delete_file_name = if_name;
183 /* remove failed attempt */
184 delete_file_name = of_name;
190 if (delete_old_file == TRUE) {
191 if (unlink(delete_file_name) < 0) {
192 error_msg_and_die("Couldnt remove %s", delete_file_name);
198 return(EXIT_SUCCESS);