blob: c39814de05218f4227242b693869d03efdeb514c [file] [log] [blame]
Erik Andersene49d5ec2000-02-08 19:58:47 +00001/* vi: set sw=4 ts=4: */
Erik Andersen61677fe2000-04-13 01:18:56 +00002/*
3 * Gzip implementation for busybox
4 *
Glenn L McGrathc2bf5ca2000-09-29 06:46:59 +00005 * Based on GNU gzip v1.2.4 Copyright (C) 1992-1993 Jean-loup Gailly.
Erik Andersen61677fe2000-04-13 01:18:56 +00006 *
7 * Originally adjusted for busybox by Sven Rudolph <sr1@inf.tu-dresden.de>
8 * based on gzip sources
9 *
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.
13 *
Glenn L McGrath58e42d52001-03-28 05:38:24 +000014 * General cleanup to better adhere to the style guide and make use of standard
15 * busybox functions by Glenn McGrath <bug1@optushome.com.au>
16 *
Erik Andersen61677fe2000-04-13 01:18:56 +000017 * 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.
21 *
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.
26 *
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
30 *
Glenn L McGrathc2bf5ca2000-09-29 06:46:59 +000031 *
32 * gzip (GNU zip) -- compress files with zip algorithm and 'compress' interface
Eric Andersenb052b471999-11-18 00:21:59 +000033 * 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.
38 *
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.
41 */
42
43#if 0
Erik Andersene49d5ec2000-02-08 19:58:47 +000044static 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.",
50 "",
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.",
55 "",
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.",
59 0
60};
Eric Andersenb052b471999-11-18 00:21:59 +000061#endif
62
Glenn L McGrathc2bf5ca2000-09-29 06:46:59 +000063#include <stdlib.h>
Glenn L McGrath7fd92942001-04-11 03:11:33 +000064#include <string.h>
65#include <unistd.h>
66#include <getopt.h>
Eric Andersencbe31da2001-02-20 06:14:08 +000067#include "busybox.h"
Eric Andersenb052b471999-11-18 00:21:59 +000068
Glenn L McGrath58e42d52001-03-28 05:38:24 +000069extern int gunzip_main(int argc, char **argv)
70{
Glenn L McGrath7fd92942001-04-11 03:11:33 +000071 FILE *in_file, *out_file;
Glenn L McGrath58e42d52001-03-28 05:38:24 +000072 struct stat stat_buf;
73
74 char *if_name = NULL;
75 char *of_name = NULL;
76 char *delete_file_name = NULL;
77
78 const int gunzip_to_stdout = 1;
Matt Kraai96dcd192001-04-18 15:54:09 +000079 const int gunzip_force = 2;
80 const int gunzip_test = 4;
Glenn L McGrath58e42d52001-03-28 05:38:24 +000081
82 int flags = 0;
83 int opt = 0;
84 int delete_old_file = FALSE;
85
Glenn L McGrath58e42d52001-03-28 05:38:24 +000086 /* if called as zcat */
Matt Kraai96dcd192001-04-18 15:54:09 +000087 if (strcmp(applet_name, "zcat") == 0)
88 flags |= gunzip_to_stdout;
Eric Andersene99674a2000-09-01 00:41:10 +000089
Glenn L McGrath5bcfc9b2001-05-07 12:01:58 +000090 while ((opt = getopt(argc, argv, "ctfhdq")) != -1) {
Matt Kraai96dcd192001-04-18 15:54:09 +000091 switch (opt) {
92 case 'c':
93 flags |= gunzip_to_stdout;
94 break;
95 case 'f':
96 flags |= gunzip_force;
97 break;
98 case 't':
99 flags |= gunzip_test;
100 break;
Matt Kraai53265542001-04-18 16:05:34 +0000101 case 'd': /* Used to convert gzip to gunzip. */
102 break;
Glenn L McGrath5bcfc9b2001-05-07 12:01:58 +0000103 case 'q':
104 error_msg("-q option not supported, ignored");
Glenn L McGrath713b3982001-05-07 12:06:37 +0000105 break;
Matt Kraai96dcd192001-04-18 15:54:09 +0000106 case 'h':
107 default:
108 show_usage(); /* exit's inside usage */
109 }
Glenn L McGrathbcfeb2a2001-04-18 13:34:09 +0000110 }
111
Glenn L McGrath58e42d52001-03-28 05:38:24 +0000112 /* Set input filename and number */
Matt Kraai117231c2001-05-22 14:23:02 +0000113 if (argv[optind] == NULL || strcmp(argv[optind], "-") == 0) {
Matt Kraai96dcd192001-04-18 15:54:09 +0000114 flags |= gunzip_to_stdout;
Glenn L McGrath58e42d52001-03-28 05:38:24 +0000115 in_file = stdin;
Eric Andersenb052b471999-11-18 00:21:59 +0000116 } else {
Glenn L McGrath58e42d52001-03-28 05:38:24 +0000117 if_name = strdup(argv[optind]);
118 /* Open input file */
119 in_file = xfopen(if_name, "r");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000120
Erik Andersene49d5ec2000-02-08 19:58:47 +0000121 /* Get the time stamp on the input file. */
Glenn L McGrath58e42d52001-03-28 05:38:24 +0000122 if (stat(if_name, &stat_buf) < 0) {
Matt Kraai96dcd192001-04-18 15:54:09 +0000123 error_msg_and_die("Couldn't stat file %s", if_name);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000124 }
Eric Andersenb052b471999-11-18 00:21:59 +0000125 }
126
Matt Kraai96dcd192001-04-18 15:54:09 +0000127 /* Check that the input is sane. */
128 if (isatty(fileno(in_file)) && (flags & gunzip_force) == 0)
129 error_msg_and_die("compressed data not read from terminal. Use -f to force it.");
130
Glenn L McGrath58e42d52001-03-28 05:38:24 +0000131 /* Set output filename and number */
Matt Kraai96dcd192001-04-18 15:54:09 +0000132 if (flags & gunzip_test) {
Glenn L McGrath58e42d52001-03-28 05:38:24 +0000133 out_file = xfopen("/dev/null", "w"); /* why does test use filenum 2 ? */
Matt Kraai96dcd192001-04-18 15:54:09 +0000134 } else if (flags & gunzip_to_stdout) {
135 out_file = stdout;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000136 } else {
Glenn L McGrath58e42d52001-03-28 05:38:24 +0000137 char *extension;
138 int length = strlen(if_name);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000139
Glenn L McGrath58e42d52001-03-28 05:38:24 +0000140 delete_old_file = TRUE;
141 extension = strrchr(if_name, '.');
Matt Kraai54652232001-04-18 15:51:45 +0000142 if (extension && strcmp(extension, ".gz") == 0) {
Glenn L McGrath58e42d52001-03-28 05:38:24 +0000143 length -= 3;
Matt Kraai54652232001-04-18 15:51:45 +0000144 } else if (extension && strcmp(extension, ".tgz") == 0) {
Glenn L McGrath58e42d52001-03-28 05:38:24 +0000145 length -= 4;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000146 } else {
Glenn L McGrath58e42d52001-03-28 05:38:24 +0000147 error_msg_and_die("Invalid extension");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000148 }
Glenn L McGrath58e42d52001-03-28 05:38:24 +0000149 of_name = (char *) xcalloc(sizeof(char), length + 1);
150 strncpy(of_name, if_name, length);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000151
Glenn L McGrath58e42d52001-03-28 05:38:24 +0000152 /* Open output file */
153 out_file = xfopen(of_name, "w");
154
Erik Andersene49d5ec2000-02-08 19:58:47 +0000155 /* Set permissions on the file */
Glenn L McGrath58e42d52001-03-28 05:38:24 +0000156 chmod(of_name, stat_buf.st_mode);
157 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000158
Glenn L McGrath58e42d52001-03-28 05:38:24 +0000159 /* do the decompression, and cleanup */
160 if (unzip(in_file, out_file) == 0) {
161 /* Success, remove .gz file */
162 delete_file_name = if_name;
163 } else {
164 /* remove failed attempt */
165 delete_file_name = of_name;
166 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000167
Glenn L McGrath58e42d52001-03-28 05:38:24 +0000168 fclose(out_file);
169 fclose(in_file);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000170
Glenn L McGrath58e42d52001-03-28 05:38:24 +0000171 if (delete_old_file == TRUE) {
172 if (unlink(delete_file_name) < 0) {
173 error_msg_and_die("Couldnt remove %s", delete_file_name);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000174 }
Eric Andersenb052b471999-11-18 00:21:59 +0000175 }
Glenn L McGrath58e42d52001-03-28 05:38:24 +0000176
177 free(of_name);
178
179 return(EXIT_SUCCESS);
Eric Andersenb052b471999-11-18 00:21:59 +0000180}