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-rw-r--r--gunzip.c183
1 files changed, 0 insertions, 183 deletions
diff --git a/gunzip.c b/gunzip.c
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1/* vi: set sw=4 ts=4: */
2/*
3 * Gzip implementation for busybox
4 *
5 * Based on GNU gzip v1.2.4 Copyright (C) 1992-1993 Jean-loup Gailly.
6 *
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 *
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>
16 *
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.
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 *
31 *
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.
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
44static 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};
61#endif
62
63#include <stdlib.h>
64#include <string.h>
65#include <unistd.h>
66#include <getopt.h>
67#include "busybox.h"
68
69extern int gunzip_main(int argc, char **argv)
70{
71 FILE *in_file = stdin;
72 FILE *out_file = NULL;
73 struct stat stat_buf;
74
75 char *if_name = NULL;
76 char *of_name = NULL;
77 char *delete_file_name = NULL;
78
79 const int gunzip_to_stdout = 1;
80 const int gunzip_force = 2;
81 const int gunzip_test = 4;
82
83 int flags = 0;
84 int opt = 0;
85 int delete_old_file = FALSE;
86
87 /* if called as zcat */
88 if (strcmp(applet_name, "zcat") == 0)
89 flags |= gunzip_to_stdout;
90
91 while ((opt = getopt(argc, argv, "ctfhdq")) != -1) {
92 switch (opt) {
93 case 'c':
94 flags |= gunzip_to_stdout;
95 break;
96 case 'f':
97 flags |= gunzip_force;
98 break;
99 case 't':
100 flags |= gunzip_test;
101 break;
102 case 'd': /* Used to convert gzip to gunzip. */
103 break;
104 case 'q':
105 error_msg("-q option not supported, ignored");
106 break;
107 case 'h':
108 default:
109 show_usage(); /* exit's inside usage */
110 }
111 }
112
113 /* Set input filename and number */
114 if (argv[optind] == NULL || strcmp(argv[optind], "-") == 0) {
115 flags |= gunzip_to_stdout;
116 } else {
117 if_name = strdup(argv[optind]);
118 /* Open input file */
119 in_file = xfopen(if_name, "r");
120
121 /* set the buffer size */
122 setvbuf(in_file, NULL, _IOFBF, 0x8000);
123
124 /* Get the time stamp on the input file. */
125 if (stat(if_name, &stat_buf) < 0) {
126 error_msg_and_die("Couldn't stat file %s", if_name);
127 }
128 }
129
130 /* Check that the input is sane. */
131 if (isatty(fileno(in_file)) && (flags & gunzip_force) == 0)
132 error_msg_and_die("compressed data not read from terminal. Use -f to force it.");
133
134 /* Set output filename and number */
135 if (flags & gunzip_test) {
136 out_file = xfopen("/dev/null", "w"); /* why does test use filenum 2 ? */
137 } else if (flags & gunzip_to_stdout) {
138 out_file = stdout;
139 } else {
140 char *extension;
141 int length = strlen(if_name);
142
143 delete_old_file = TRUE;
144 extension = strrchr(if_name, '.');
145 if (extension && strcmp(extension, ".gz") == 0) {
146 length -= 3;
147 } else if (extension && strcmp(extension, ".tgz") == 0) {
148 length -= 4;
149 } else {
150 error_msg_and_die("Invalid extension");
151 }
152 of_name = (char *) xcalloc(sizeof(char), length + 1);
153 strncpy(of_name, if_name, length);
154
155 /* Open output file */
156 out_file = xfopen(of_name, "w");
157
158 /* Set permissions on the file */
159 chmod(of_name, stat_buf.st_mode);
160 }
161
162 /* do the decompression, and cleanup */
163 if (unzip(in_file, out_file) == 0) {
164 /* Success, remove .gz file */
165 delete_file_name = if_name;
166 } else {
167 /* remove failed attempt */
168 delete_file_name = of_name;
169 }
170
171 fclose(out_file);
172 fclose(in_file);
173
174 if (delete_old_file == TRUE) {
175 if (unlink(delete_file_name) < 0) {
176 error_msg_and_die("Couldnt remove %s", delete_file_name);
177 }
178 }
179
180 free(of_name);
181
182 return(EXIT_SUCCESS);
183}
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