[821] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Gzip implementation for busybox
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| 4 | *
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| 5 | * Based on GNU gzip v1.2.4 Copyright (C) 1992-1993 Jean-loup Gailly.
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| 6 | *
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| 7 | * Originally adjusted for busybox by Sven Rudolph <sr1@inf.tu-dresden.de>
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| 8 | * based on gzip sources
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| 9 | *
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| 10 | * Adjusted further by Erik Andersen <andersen@codepoet.org> to support files as
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| 11 | * well as stdin/stdout, and to generally behave itself wrt command line
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| 12 | * handling.
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| 13 | *
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| 14 | * General cleanup to better adhere to the style guide and make use of standard
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| 15 | * busybox functions by Glenn McGrath <bug1@iinet.net.au>
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| 16 | *
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| 17 | * This program is free software; you can redistribute it and/or modify
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| 18 | * it under the terms of the GNU General Public License as published by
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| 19 | * the Free Software Foundation; either version 2 of the License, or
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| 20 | * (at your option) any later version.
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| 21 | *
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| 22 | * This program is distributed in the hope that it will be useful,
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| 23 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 24 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 25 | * General Public License for more details.
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| 26 | *
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| 27 | * You should have received a copy of the GNU General Public License
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| 28 | * along with this program; if not, write to the Free Software
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| 29 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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| 30 | *
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| 31 | *
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| 32 | * gzip (GNU zip) -- compress files with zip algorithm and 'compress' interface
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| 33 | * Copyright (C) 1992-1993 Jean-loup Gailly
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| 34 | * The unzip code was written and put in the public domain by Mark Adler.
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| 35 | * Portions of the lzw code are derived from the public domain 'compress'
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| 36 | * written by Spencer Thomas, Joe Orost, James Woods, Jim McKie, Steve Davies,
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| 37 | * Ken Turkowski, Dave Mack and Peter Jannesen.
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| 38 | *
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| 39 | * See the license_msg below and the file COPYING for the software license.
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| 40 | * See the file algorithm.doc for the compression algorithms and file formats.
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| 41 | */
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| 42 |
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| 43 | #if 0
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| 44 | static char *license_msg[] = {
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| 45 | " Copyright (C) 1992-1993 Jean-loup Gailly",
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| 46 | " This program is free software; you can redistribute it and/or modify",
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| 47 | " it under the terms of the GNU General Public License as published by",
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| 48 | " the Free Software Foundation; either version 2, or (at your option)",
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| 49 | " any later version.",
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| 50 | "",
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| 51 | " This program is distributed in the hope that it will be useful,",
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| 52 | " but WITHOUT ANY WARRANTY; without even the implied warranty of",
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| 53 | " MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the",
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| 54 | " GNU General Public License for more details.",
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| 55 | "",
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| 56 | " You should have received a copy of the GNU General Public License",
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| 57 | " along with this program; if not, write to the Free Software",
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| 58 | " Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.",
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| 59 | 0
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| 60 | };
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| 61 | #endif
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| 62 |
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| 63 | #include <stdlib.h>
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| 64 | #include <string.h>
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| 65 | #include <unistd.h>
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| 66 | #include <sys/types.h>
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| 67 | #include <sys/stat.h>
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| 68 | #include <fcntl.h>
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| 69 |
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| 70 | #include "busybox.h"
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| 71 | #include "unarchive.h"
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| 72 |
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| 73 | #define GUNZIP_OPT_STDOUT 1
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| 74 | #define GUNZIP_OPT_FORCE 2
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| 75 | #define GUNZIP_OPT_TEST 4
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| 76 | #define GUNZIP_OPT_DECOMPRESS 8
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| 77 |
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| 78 | int gunzip_main(int argc, char **argv)
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| 79 | {
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| 80 | char status = EXIT_SUCCESS;
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| 81 | unsigned long opt;
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| 82 |
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| 83 | opt = bb_getopt_ulflags(argc, argv, "cftd");
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| 84 | /* if called as zcat */
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| 85 | if (strcmp(bb_applet_name, "zcat") == 0) {
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| 86 | opt |= GUNZIP_OPT_STDOUT;
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| 87 | }
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| 88 |
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| 89 | do {
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| 90 | struct stat stat_buf;
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| 91 | const char *old_path = argv[optind];
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| 92 | const char *delete_path = NULL;
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| 93 | char *new_path = NULL;
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| 94 | int src_fd;
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| 95 | int dst_fd;
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| 96 |
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| 97 | optind++;
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| 98 |
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| 99 | if (old_path == NULL || strcmp(old_path, "-") == 0) {
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| 100 | src_fd = STDIN_FILENO;
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| 101 | opt |= GUNZIP_OPT_STDOUT;
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| 102 | } else {
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| 103 | src_fd = bb_xopen(old_path, O_RDONLY);
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| 104 |
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| 105 | /* Get the time stamp on the input file. */
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| 106 | xstat(old_path, &stat_buf);
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| 107 | }
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| 108 |
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| 109 | /* Check that the input is sane. */
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| 110 | if (isatty(src_fd) && ((opt & GUNZIP_OPT_FORCE) == 0)) {
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| 111 | bb_error_msg_and_die
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| 112 | ("compressed data not read from terminal. Use -f to force it.");
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| 113 | }
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| 114 |
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| 115 | /* Set output filename and number */
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| 116 | if (opt & GUNZIP_OPT_TEST) {
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| 117 | dst_fd = bb_xopen(bb_dev_null, O_WRONLY); /* why does test use filenum 2 ? */
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| 118 | } else if (opt & GUNZIP_OPT_STDOUT) {
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| 119 | dst_fd = STDOUT_FILENO;
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| 120 | } else {
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| 121 | char *extension;
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| 122 |
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| 123 | new_path = bb_xstrdup(old_path);
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| 124 |
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| 125 | extension = strrchr(new_path, '.');
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| 126 | #ifdef CONFIG_FEATURE_GUNZIP_UNCOMPRESS
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| 127 | if (extension && (strcmp(extension, ".Z") == 0)) {
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| 128 | *extension = '\0';
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| 129 | } else
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| 130 | #endif
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| 131 | if (extension && (strcmp(extension, ".gz") == 0)) {
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| 132 | *extension = '\0';
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| 133 | } else if (extension && (strcmp(extension, ".tgz") == 0)) {
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| 134 | extension[2] = 'a';
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| 135 | extension[3] = 'r';
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| 136 | } else {
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| 137 | bb_error_msg_and_die("Invalid extension");
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| 138 | }
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| 139 |
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| 140 | /* Open output file (with correct permissions) */
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| 141 | dst_fd = bb_xopen3(new_path, O_WRONLY | O_CREAT, stat_buf.st_mode);
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| 142 |
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| 143 | /* If unzip succeeds remove the old file */
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| 144 | delete_path = old_path;
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| 145 | }
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| 146 |
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| 147 | /* do the decompression, and cleanup */
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| 148 | if (bb_xread_char(src_fd) == 0x1f) {
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| 149 | unsigned char magic2;
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| 150 |
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| 151 | magic2 = bb_xread_char(src_fd);
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| 152 | #ifdef CONFIG_FEATURE_GUNZIP_UNCOMPRESS
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| 153 | if (magic2 == 0x9d) {
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| 154 | status = uncompress(src_fd, dst_fd);
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| 155 | } else
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| 156 | #endif
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| 157 | if (magic2 == 0x8b) {
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| 158 | check_header_gzip(src_fd);
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| 159 | status = inflate_gunzip(src_fd, dst_fd);
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| 160 | if (status != 0) {
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| 161 | bb_error_msg_and_die("Error inflating");
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| 162 | }
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| 163 | } else {
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| 164 | bb_error_msg_and_die("Invalid magic");
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| 165 | }
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| 166 | } else {
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| 167 | bb_error_msg_and_die("Invalid magic");
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| 168 | }
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| 169 |
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| 170 | if ((status != EXIT_SUCCESS) && (new_path)) {
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| 171 | /* Unzip failed, remove new path instead of old path */
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| 172 | delete_path = new_path;
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| 173 | }
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| 174 |
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| 175 | if (dst_fd != STDOUT_FILENO) {
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| 176 | close(dst_fd);
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| 177 | }
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| 178 | if (src_fd != STDIN_FILENO) {
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| 179 | close(src_fd);
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| 180 | }
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| 181 |
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| 182 | /* delete_path will be NULL if in test mode or from stdin */
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| 183 | if (delete_path && (unlink(delete_path) == -1)) {
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| 184 | bb_error_msg_and_die("Couldn't remove %s", delete_path);
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| 185 | }
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| 186 |
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| 187 | free(new_path);
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| 188 |
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| 189 | } while (optind < argc);
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| 190 |
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| 191 | return status;
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| 192 | }
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