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.",
63 //#include <sys/types.h>
64 //#include <sys/wait.h>
71 #define BB_DECLARE_EXTERN
72 #define bb_need_memory_exhausted
73 #define bb_need_name_too_long
76 extern int gunzip_main(int argc, char **argv)
78 FILE *in_file, *out_file;
83 char *delete_file_name = NULL;
85 const int gunzip_to_stdout = 1;
86 const int gunzip_from_stdin = 2;
87 const int gunzip_force = 4;
88 const int gunzip_test = 8;
92 int delete_old_file = FALSE;
94 /* if called as zcat */
95 if (strcmp(applet_name, "zcat") == 0) {
100 flags |= (gunzip_force | gunzip_to_stdout);
102 /* workout flags as regular gunzip */
103 /* set default flags */
105 flags |= (gunzip_from_stdin | gunzip_to_stdout);
107 /* Parse any options */
108 while ((opt = getopt(argc, argv, "ctfh")) != -1) {
111 flags |= gunzip_to_stdout;
114 flags |= gunzip_force;
117 flags |= gunzip_test;
121 show_usage(); /* exit's inside usage */
127 /* Set input filename and number */
128 if (flags & gunzip_from_stdin) {
130 if ((flags & gunzip_force) == 0) {
131 error_msg_and_die("data not written to terminal. Use -f to force it.");
134 if_name = strdup(argv[optind]);
135 /* Open input file */
136 in_file = xfopen(if_name, "r");
138 /* Get the time stamp on the input file. */
139 if (stat(if_name, &stat_buf) < 0) {
140 error_msg_and_die("Couldnt stat file %s",if_name);
144 /* Set output filename and number */
145 if (flags & gunzip_to_stdout) {
147 /* whats the best way to do this with streams ? */
148 if (isatty(fileno(out_file)) && ((flags & gunzip_force) == 0)) {
149 error_msg_and_die("data not written to terminal. Use -f to force it.");
151 } else if (flags & gunzip_test) {
152 out_file = xfopen("/dev/null", "w"); /* why does test use filenum 2 ? */
155 int length = strlen(if_name);
157 delete_old_file = TRUE;
158 extension = strrchr(if_name, '.');
159 if (strcmp(extension, ".gz") == 0) {
161 } else if (strcmp(extension, ".tgz") == 0) {
164 error_msg_and_die("Invalid extension");
166 of_name = (char *) xcalloc(sizeof(char), length + 1);
167 strncpy(of_name, if_name, length);
169 /* Open output file */
170 out_file = xfopen(of_name, "w");
172 /* Set permissions on the file */
173 chmod(of_name, stat_buf.st_mode);
176 /* do the decompression, and cleanup */
177 if (unzip(in_file, out_file) == 0) {
178 /* Success, remove .gz file */
179 delete_file_name = if_name;
181 /* remove failed attempt */
182 delete_file_name = of_name;
188 if (delete_old_file == TRUE) {
189 if (unlink(delete_file_name) < 0) {
190 error_msg_and_die("Couldnt remove %s", delete_file_name);
196 return(EXIT_SUCCESS);