Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 1 | /* vi: set sw=4 ts=4: */ |
Erik Andersen | 61677fe | 2000-04-13 01:18:56 +0000 | [diff] [blame] | 2 | /* |
| 3 | * Gzip implementation for busybox |
| 4 | * |
Glenn L McGrath | c2bf5ca | 2000-09-29 06:46:59 +0000 | [diff] [blame] | 5 | * Based on GNU gzip v1.2.4 Copyright (C) 1992-1993 Jean-loup Gailly. |
Erik Andersen | 61677fe | 2000-04-13 01:18:56 +0000 | [diff] [blame] | 6 | * |
| 7 | * Originally adjusted for busybox by Sven Rudolph <sr1@inf.tu-dresden.de> |
| 8 | * based on gzip sources |
| 9 | * |
Eric Andersen | 50e4d66 | 2002-04-06 05:15:46 +0000 | [diff] [blame] | 10 | * Adjusted further by Erik Andersen <andersee@debian.org> to support files as |
| 11 | * well as stdin/stdout, and to generally behave itself wrt command line |
| 12 | * handling. |
Erik Andersen | 61677fe | 2000-04-13 01:18:56 +0000 | [diff] [blame] | 13 | * |
Glenn L McGrath | 58e42d5 | 2001-03-28 05:38:24 +0000 | [diff] [blame] | 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 | * |
Erik Andersen | 61677fe | 2000-04-13 01:18:56 +0000 | [diff] [blame] | 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 | * |
Glenn L McGrath | c2bf5ca | 2000-09-29 06:46:59 +0000 | [diff] [blame] | 31 | * |
| 32 | * gzip (GNU zip) -- compress files with zip algorithm and 'compress' interface |
Eric Andersen | b052b47 | 1999-11-18 00:21:59 +0000 | [diff] [blame] | 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 |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 44 | static 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 Andersen | b052b47 | 1999-11-18 00:21:59 +0000 | [diff] [blame] | 61 | #endif |
| 62 | |
Glenn L McGrath | c2bf5ca | 2000-09-29 06:46:59 +0000 | [diff] [blame] | 63 | #include <stdlib.h> |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 64 | #include <string.h> |
| 65 | #include <unistd.h> |
| 66 | #include <getopt.h> |
Eric Andersen | cbe31da | 2001-02-20 06:14:08 +0000 | [diff] [blame] | 67 | #include "busybox.h" |
Eric Andersen | b052b47 | 1999-11-18 00:21:59 +0000 | [diff] [blame] | 68 | |
Matt Kraai | a4a65e7 | 2002-04-29 15:32:32 +0000 | [diff] [blame] | 69 | const int gunzip_to_stdout = 1; |
| 70 | const int gunzip_force = 2; |
| 71 | const int gunzip_test = 4; |
| 72 | const int gunzip_verbose = 8; |
| 73 | |
| 74 | static int gunzip_file (const char *path, int flags) |
| 75 | { |
| 76 | FILE *in_file, *out_file; |
| 77 | struct stat stat_buf; |
Robert Griebl | 7ac8684 | 2002-05-15 21:57:42 +0000 | [diff] [blame] | 78 | const char *delete_path = NULL; |
Matt Kraai | a4a65e7 | 2002-04-29 15:32:32 +0000 | [diff] [blame] | 79 | char *out_path = NULL; |
| 80 | |
| 81 | if (path == NULL || strcmp (path, "-") == 0) { |
| 82 | in_file = stdin; |
| 83 | flags |= gunzip_to_stdout; |
| 84 | } else { |
| 85 | if ((in_file = wfopen(path, "r")) == NULL) |
| 86 | return -1; |
| 87 | |
| 88 | if (flags & gunzip_verbose) { |
| 89 | fprintf(stderr, "%s:\t", path); |
| 90 | } |
| 91 | |
| 92 | /* set the buffer size */ |
| 93 | setvbuf(in_file, NULL, _IOFBF, 0x8000); |
| 94 | |
| 95 | /* Get the time stamp on the input file. */ |
| 96 | if (stat(path, &stat_buf) < 0) { |
| 97 | error_msg_and_die("Couldn't stat file %s", path); |
| 98 | } |
| 99 | } |
| 100 | |
| 101 | /* Check that the input is sane. */ |
| 102 | if (isatty(fileno(in_file)) && (flags & gunzip_force) == 0) |
| 103 | error_msg_and_die("compressed data not read from terminal. Use -f to force it."); |
| 104 | |
| 105 | /* Set output filename and number */ |
| 106 | if (flags & gunzip_test) { |
| 107 | out_file = xfopen("/dev/null", "w"); /* why does test use filenum 2 ? */ |
| 108 | } else if (flags & gunzip_to_stdout) { |
| 109 | out_file = stdout; |
| 110 | } else { |
| 111 | char *extension; |
| 112 | int length = strlen(path); |
| 113 | |
| 114 | extension = strrchr(path, '.'); |
| 115 | if (extension && strcmp(extension, ".gz") == 0) { |
| 116 | length -= 3; |
| 117 | } else if (extension && strcmp(extension, ".tgz") == 0) { |
| 118 | length -= 4; |
| 119 | } else { |
| 120 | error_msg_and_die("Invalid extension"); |
| 121 | } |
Robert Griebl | d378c31 | 2002-07-19 00:05:54 +0000 | [diff] [blame^] | 122 | out_path = xstrndup(path, length); |
Matt Kraai | a4a65e7 | 2002-04-29 15:32:32 +0000 | [diff] [blame] | 123 | |
| 124 | /* Open output file */ |
| 125 | out_file = xfopen(out_path, "w"); |
| 126 | |
| 127 | /* Set permissions on the file */ |
| 128 | chmod(out_path, stat_buf.st_mode); |
| 129 | } |
| 130 | |
| 131 | /* do the decompression, and cleanup */ |
| 132 | if (unzip(in_file, out_file) == 0) { |
| 133 | /* Success, remove .gz file */ |
Robert Griebl | 081df62 | 2002-05-15 21:45:52 +0000 | [diff] [blame] | 134 | if ( !(flags & gunzip_to_stdout )) |
| 135 | delete_path = path; |
Matt Kraai | a4a65e7 | 2002-04-29 15:32:32 +0000 | [diff] [blame] | 136 | if (flags & gunzip_verbose) { |
| 137 | fprintf(stderr, "OK\n"); |
| 138 | } |
| 139 | } else { |
| 140 | /* remove failed attempt */ |
| 141 | delete_path = out_path; |
| 142 | } |
| 143 | |
Robert Griebl | 7ac8684 | 2002-05-15 21:57:42 +0000 | [diff] [blame] | 144 | if (out_file != stdout) |
| 145 | fclose(out_file); |
| 146 | if (in_file != stdin) |
| 147 | fclose(in_file); |
Matt Kraai | a4a65e7 | 2002-04-29 15:32:32 +0000 | [diff] [blame] | 148 | |
| 149 | if (delete_path && !(flags & gunzip_test)) { |
| 150 | if (unlink(delete_path) < 0) { |
| 151 | error_msg_and_die("Couldn't remove %s", delete_path); |
| 152 | } |
| 153 | } |
| 154 | |
| 155 | free(out_path); |
| 156 | |
| 157 | return 0; |
| 158 | } |
| 159 | |
Glenn L McGrath | 58e42d5 | 2001-03-28 05:38:24 +0000 | [diff] [blame] | 160 | extern int gunzip_main(int argc, char **argv) |
| 161 | { |
Eric Andersen | d75ac02 | 2002-04-13 09:10:34 +0000 | [diff] [blame] | 162 | int flags = 0; |
Matt Kraai | a4a65e7 | 2002-04-29 15:32:32 +0000 | [diff] [blame] | 163 | int i, opt; |
| 164 | int status = EXIT_SUCCESS; |
Glenn L McGrath | 58e42d5 | 2001-03-28 05:38:24 +0000 | [diff] [blame] | 165 | |
Glenn L McGrath | 58e42d5 | 2001-03-28 05:38:24 +0000 | [diff] [blame] | 166 | /* if called as zcat */ |
Matt Kraai | 96dcd19 | 2001-04-18 15:54:09 +0000 | [diff] [blame] | 167 | if (strcmp(applet_name, "zcat") == 0) |
| 168 | flags |= gunzip_to_stdout; |
Eric Andersen | e99674a | 2000-09-01 00:41:10 +0000 | [diff] [blame] | 169 | |
Eric Andersen | d75ac02 | 2002-04-13 09:10:34 +0000 | [diff] [blame] | 170 | while ((opt = getopt(argc, argv, "ctfhdqv")) != -1) { |
Matt Kraai | 96dcd19 | 2001-04-18 15:54:09 +0000 | [diff] [blame] | 171 | switch (opt) { |
| 172 | case 'c': |
| 173 | flags |= gunzip_to_stdout; |
| 174 | break; |
| 175 | case 'f': |
| 176 | flags |= gunzip_force; |
| 177 | break; |
| 178 | case 't': |
| 179 | flags |= gunzip_test; |
| 180 | break; |
Eric Andersen | d75ac02 | 2002-04-13 09:10:34 +0000 | [diff] [blame] | 181 | case 'v': |
| 182 | flags |= gunzip_verbose; |
| 183 | break; |
Matt Kraai | 5326554 | 2001-04-18 16:05:34 +0000 | [diff] [blame] | 184 | case 'd': /* Used to convert gzip to gunzip. */ |
| 185 | break; |
Glenn L McGrath | 5bcfc9b | 2001-05-07 12:01:58 +0000 | [diff] [blame] | 186 | case 'q': |
| 187 | error_msg("-q option not supported, ignored"); |
Glenn L McGrath | 713b398 | 2001-05-07 12:06:37 +0000 | [diff] [blame] | 188 | break; |
Matt Kraai | 96dcd19 | 2001-04-18 15:54:09 +0000 | [diff] [blame] | 189 | case 'h': |
| 190 | default: |
| 191 | show_usage(); /* exit's inside usage */ |
| 192 | } |
Glenn L McGrath | bcfeb2a | 2001-04-18 13:34:09 +0000 | [diff] [blame] | 193 | } |
| 194 | |
Matt Kraai | a4a65e7 | 2002-04-29 15:32:32 +0000 | [diff] [blame] | 195 | if (optind == argc) { |
| 196 | if (gunzip_file (NULL, flags) < 0) |
| 197 | status = EXIT_FAILURE; |
Robert Griebl | 7ac8684 | 2002-05-15 21:57:42 +0000 | [diff] [blame] | 198 | } else { |
| 199 | for (i = optind; i < argc; i++) { |
Matt Kraai | a4a65e7 | 2002-04-29 15:32:32 +0000 | [diff] [blame] | 200 | if (gunzip_file (argv[i], flags) < 0) |
| 201 | status = EXIT_FAILURE; |
Robert Griebl | 7ac8684 | 2002-05-15 21:57:42 +0000 | [diff] [blame] | 202 | } |
| 203 | } |
Matt Kraai | a4a65e7 | 2002-04-29 15:32:32 +0000 | [diff] [blame] | 204 | return status; |
Eric Andersen | b052b47 | 1999-11-18 00:21:59 +0000 | [diff] [blame] | 205 | } |