source: branches/stable/mindi-busybox/archival/gunzip.c @ 821

Last change on this file since 821 was 821, checked in by bruno, 13 years ago

Addition of busybox 1.2.1 as a mindi-busybox new package
This should avoid delivering binary files in mindi not built there (Fedora and Debian are quite serious about that)

File size: 5.6 KB
Line 
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@codepoet.org> to support files as
11 * well as stdin/stdout, and to generally behave itself wrt command line
12 * handling.
13 *
14 * General cleanup to better adhere to the style guide and make use of standard
15 * busybox functions by Glenn McGrath <bug1@iinet.net.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 <sys/types.h>
67#include <sys/stat.h>
68#include <fcntl.h>
69
70#include "busybox.h"
71#include "unarchive.h"
72
73#define GUNZIP_OPT_STDOUT   1
74#define GUNZIP_OPT_FORCE    2
75#define GUNZIP_OPT_TEST     4
76#define GUNZIP_OPT_DECOMPRESS   8
77
78int gunzip_main(int argc, char **argv)
79{
80    char status = EXIT_SUCCESS;
81    unsigned long opt;
82
83    opt = bb_getopt_ulflags(argc, argv, "cftd");
84    /* if called as zcat */
85    if (strcmp(bb_applet_name, "zcat") == 0) {
86        opt |= GUNZIP_OPT_STDOUT;
87    }
88
89    do {
90        struct stat stat_buf;
91        const char *old_path = argv[optind];
92        const char *delete_path = NULL;
93        char *new_path = NULL;
94        int src_fd;
95        int dst_fd;
96
97        optind++;
98
99        if (old_path == NULL || strcmp(old_path, "-") == 0) {
100            src_fd = STDIN_FILENO;
101            opt |= GUNZIP_OPT_STDOUT;
102        } else {
103            src_fd = bb_xopen(old_path, O_RDONLY);
104
105            /* Get the time stamp on the input file. */
106            xstat(old_path, &stat_buf);
107        }
108
109        /* Check that the input is sane.  */
110        if (isatty(src_fd) && ((opt & GUNZIP_OPT_FORCE) == 0)) {
111            bb_error_msg_and_die
112                ("compressed data not read from terminal.  Use -f to force it.");
113        }
114
115        /* Set output filename and number */
116        if (opt & GUNZIP_OPT_TEST) {
117            dst_fd = bb_xopen(bb_dev_null, O_WRONLY);   /* why does test use filenum 2 ? */
118        } else if (opt & GUNZIP_OPT_STDOUT) {
119            dst_fd = STDOUT_FILENO;
120        } else {
121            char *extension;
122
123            new_path = bb_xstrdup(old_path);
124
125            extension = strrchr(new_path, '.');
126#ifdef CONFIG_FEATURE_GUNZIP_UNCOMPRESS
127            if (extension && (strcmp(extension, ".Z") == 0)) {
128                *extension = '\0';
129            } else
130#endif
131            if (extension && (strcmp(extension, ".gz") == 0)) {
132                *extension = '\0';
133            } else if (extension && (strcmp(extension, ".tgz") == 0)) {
134                extension[2] = 'a';
135                extension[3] = 'r';
136            } else {
137                bb_error_msg_and_die("Invalid extension");
138            }
139
140            /* Open output file (with correct permissions) */
141            dst_fd = bb_xopen3(new_path, O_WRONLY | O_CREAT, stat_buf.st_mode);
142
143            /* If unzip succeeds remove the old file */
144            delete_path = old_path;
145        }
146
147        /* do the decompression, and cleanup */
148        if (bb_xread_char(src_fd) == 0x1f) {
149            unsigned char magic2;
150
151            magic2 = bb_xread_char(src_fd);
152#ifdef CONFIG_FEATURE_GUNZIP_UNCOMPRESS
153            if (magic2 == 0x9d) {
154                status = uncompress(src_fd, dst_fd);
155            } else
156#endif
157                if (magic2 == 0x8b) {
158                    check_header_gzip(src_fd);
159                    status = inflate_gunzip(src_fd, dst_fd);
160                    if (status != 0) {
161                        bb_error_msg_and_die("Error inflating");
162                    }
163                } else {
164                    bb_error_msg_and_die("Invalid magic");
165                }
166        } else {
167            bb_error_msg_and_die("Invalid magic");
168        }
169
170        if ((status != EXIT_SUCCESS) && (new_path)) {
171            /* Unzip failed, remove new path instead of old path */
172            delete_path = new_path;
173        }
174
175        if (dst_fd != STDOUT_FILENO) {
176            close(dst_fd);
177        }
178        if (src_fd != STDIN_FILENO) {
179            close(src_fd);
180        }
181
182        /* delete_path will be NULL if in test mode or from stdin */
183        if (delete_path && (unlink(delete_path) == -1)) {
184            bb_error_msg_and_die("Couldn't remove %s", delete_path);
185        }
186
187        free(new_path);
188
189    } while (optind < argc);
190
191    return status;
192}
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