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@codepoet.org> to support files as
11 * well as stdin/stdout, and to generally behave itself wrt command line
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>
17 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
19 * gzip (GNU zip) -- compress files with zip algorithm and 'compress' interface
20 * Copyright (C) 1992-1993 Jean-loup Gailly
21 * The unzip code was written and put in the public domain by Mark Adler.
22 * Portions of the lzw code are derived from the public domain 'compress'
23 * written by Spencer Thomas, Joe Orost, James Woods, Jim McKie, Steve Davies,
24 * Ken Turkowski, Dave Mack and Peter Jannesen.
26 * See the license_msg below and the file COPYING for the software license.
27 * See the file algorithm.doc for the compression algorithms and file formats.
31 #include "unarchive.h"
33 #define GUNZIP_OPT_STDOUT 1
34 #define GUNZIP_OPT_FORCE 2
35 #define GUNZIP_OPT_TEST 4
36 #define GUNZIP_OPT_DECOMPRESS 8
37 #define GUNZIP_OPT_VERBOSE 0x10
39 int gunzip_main(int argc, char **argv);
40 int gunzip_main(int argc, char **argv)
42 USE_DESKTOP(long long) int status;
46 opt = getopt32(argc, argv, "cftdv");
47 /* if called as zcat */
48 if (strcmp(applet_name, "zcat") == 0) {
49 opt |= GUNZIP_OPT_STDOUT;
54 char *old_path = argv[optind];
55 char *delete_path = NULL;
56 char *new_path = NULL;
62 if (old_path == NULL || LONE_DASH(old_path)) {
63 src_fd = STDIN_FILENO;
64 opt |= GUNZIP_OPT_STDOUT;
65 USE_DESKTOP(opt &= ~GUNZIP_OPT_VERBOSE;)
66 optind = argc; /* we don't handle "gunzip - a.gz b.gz" */
68 src_fd = xopen(old_path, O_RDONLY);
69 /* Get the time stamp on the input file. */
70 fstat(src_fd, &stat_buf);
73 /* Check that the input is sane. */
74 if (isatty(src_fd) && !(opt & GUNZIP_OPT_FORCE)) {
76 ("compressed data not read from terminal, use -f to force it");
79 /* Set output filename and number */
80 if (opt & GUNZIP_OPT_TEST) {
81 dst_fd = xopen(bb_dev_null, O_WRONLY); /* why does test use filenum 2 ? */
82 } else if (opt & GUNZIP_OPT_STDOUT) {
83 dst_fd = STDOUT_FILENO;
87 new_path = xstrdup(old_path);
89 extension = strrchr(new_path, '.');
90 #ifdef CONFIG_FEATURE_GUNZIP_UNCOMPRESS
91 if (extension && (strcmp(extension, ".Z") == 0)) {
95 if (extension && (strcmp(extension, ".gz") == 0)) {
97 } else if (extension && (strcmp(extension, ".tgz") == 0)) {
101 // FIXME: should we die or just skip to next?
102 bb_error_msg_and_die("invalid extension");
105 /* Open output file (with correct permissions) */
106 dst_fd = xopen3(new_path, O_WRONLY | O_CREAT | O_TRUNC,
109 /* If unzip succeeds remove the old file */
110 delete_path = old_path;
114 /* do the decompression, and cleanup */
115 if (xread_char(src_fd) == 0x1f) {
116 unsigned char magic2;
118 magic2 = xread_char(src_fd);
119 if (ENABLE_FEATURE_GUNZIP_UNCOMPRESS && magic2 == 0x9d) {
120 status = uncompress(src_fd, dst_fd);
121 } else if (magic2 == 0x8b) {
122 check_header_gzip(src_fd); // FIXME: xfunc? _or_die?
123 status = inflate_gunzip(src_fd, dst_fd);
125 bb_error_msg("invalid magic");
129 bb_error_msg("error inflating");
132 else if (ENABLE_DESKTOP && (opt & GUNZIP_OPT_VERBOSE)) {
133 fprintf(stderr, "%s: %u%% - replaced with %s\n",
134 old_path, (unsigned)(stat_buf.st_size*100 / (status+1)), new_path);
137 bb_error_msg("invalid magic");
140 if (status < 0 && new_path) {
141 /* Unzip failed, remove new path instead of old path */
142 delete_path = new_path;
145 if (dst_fd != STDOUT_FILENO) {
148 if (src_fd != STDIN_FILENO) {
152 /* delete_path will be NULL if in test mode or from stdin */
153 if (delete_path && (unlink(delete_path) == -1)) {
154 bb_error_msg("cannot remove %s", delete_path);
160 } while (optind < argc);