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 | * |
| 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 | * |
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" |
Glenn L McGrath | c2bf5ca | 2000-09-29 06:46:59 +0000 | [diff] [blame] | 68 | #define BB_DECLARE_EXTERN |
| 69 | #define bb_need_memory_exhausted |
| 70 | #define bb_need_name_too_long |
| 71 | #include "messages.c" |
Eric Andersen | b052b47 | 1999-11-18 00:21:59 +0000 | [diff] [blame] | 72 | |
Glenn L McGrath | 58e42d5 | 2001-03-28 05:38:24 +0000 | [diff] [blame] | 73 | extern int gunzip_main(int argc, char **argv) |
| 74 | { |
Glenn L McGrath | 7fd9294 | 2001-04-11 03:11:33 +0000 | [diff] [blame] | 75 | FILE *in_file, *out_file; |
Glenn L McGrath | 58e42d5 | 2001-03-28 05:38:24 +0000 | [diff] [blame] | 76 | struct stat stat_buf; |
| 77 | |
| 78 | char *if_name = NULL; |
| 79 | char *of_name = NULL; |
| 80 | char *delete_file_name = NULL; |
| 81 | |
| 82 | const int gunzip_to_stdout = 1; |
Matt Kraai | 96dcd19 | 2001-04-18 15:54:09 +0000 | [diff] [blame] | 83 | const int gunzip_force = 2; |
| 84 | const int gunzip_test = 4; |
Glenn L McGrath | 58e42d5 | 2001-03-28 05:38:24 +0000 | [diff] [blame] | 85 | |
| 86 | int flags = 0; |
| 87 | int opt = 0; |
| 88 | int delete_old_file = FALSE; |
| 89 | |
Glenn L McGrath | 58e42d5 | 2001-03-28 05:38:24 +0000 | [diff] [blame] | 90 | /* if called as zcat */ |
Matt Kraai | 96dcd19 | 2001-04-18 15:54:09 +0000 | [diff] [blame] | 91 | if (strcmp(applet_name, "zcat") == 0) |
| 92 | flags |= gunzip_to_stdout; |
Eric Andersen | e99674a | 2000-09-01 00:41:10 +0000 | [diff] [blame] | 93 | |
Matt Kraai | 5326554 | 2001-04-18 16:05:34 +0000 | [diff] [blame] | 94 | while ((opt = getopt(argc, argv, "ctfhd")) != -1) { |
Matt Kraai | 96dcd19 | 2001-04-18 15:54:09 +0000 | [diff] [blame] | 95 | switch (opt) { |
| 96 | case 'c': |
| 97 | flags |= gunzip_to_stdout; |
| 98 | break; |
| 99 | case 'f': |
| 100 | flags |= gunzip_force; |
| 101 | break; |
| 102 | case 't': |
| 103 | flags |= gunzip_test; |
| 104 | break; |
Matt Kraai | 5326554 | 2001-04-18 16:05:34 +0000 | [diff] [blame] | 105 | case 'd': /* Used to convert gzip to gunzip. */ |
| 106 | break; |
Matt Kraai | 96dcd19 | 2001-04-18 15:54:09 +0000 | [diff] [blame] | 107 | case 'h': |
| 108 | default: |
| 109 | show_usage(); /* exit's inside usage */ |
| 110 | } |
Glenn L McGrath | bcfeb2a | 2001-04-18 13:34:09 +0000 | [diff] [blame] | 111 | } |
| 112 | |
Glenn L McGrath | 58e42d5 | 2001-03-28 05:38:24 +0000 | [diff] [blame] | 113 | /* Set input filename and number */ |
Matt Kraai | 96dcd19 | 2001-04-18 15:54:09 +0000 | [diff] [blame] | 114 | if (argv[optind] == NULL) { |
| 115 | flags |= gunzip_to_stdout; |
Glenn L McGrath | 58e42d5 | 2001-03-28 05:38:24 +0000 | [diff] [blame] | 116 | in_file = stdin; |
Eric Andersen | b052b47 | 1999-11-18 00:21:59 +0000 | [diff] [blame] | 117 | } else { |
Glenn L McGrath | 58e42d5 | 2001-03-28 05:38:24 +0000 | [diff] [blame] | 118 | if_name = strdup(argv[optind]); |
| 119 | /* Open input file */ |
| 120 | in_file = xfopen(if_name, "r"); |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 121 | |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 122 | /* Get the time stamp on the input file. */ |
Glenn L McGrath | 58e42d5 | 2001-03-28 05:38:24 +0000 | [diff] [blame] | 123 | if (stat(if_name, &stat_buf) < 0) { |
Matt Kraai | 96dcd19 | 2001-04-18 15:54:09 +0000 | [diff] [blame] | 124 | error_msg_and_die("Couldn't stat file %s", if_name); |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 125 | } |
Eric Andersen | b052b47 | 1999-11-18 00:21:59 +0000 | [diff] [blame] | 126 | } |
| 127 | |
Matt Kraai | 96dcd19 | 2001-04-18 15:54:09 +0000 | [diff] [blame] | 128 | /* Check that the input is sane. */ |
| 129 | if (isatty(fileno(in_file)) && (flags & gunzip_force) == 0) |
| 130 | error_msg_and_die("compressed data not read from terminal. Use -f to force it."); |
| 131 | |
Glenn L McGrath | 58e42d5 | 2001-03-28 05:38:24 +0000 | [diff] [blame] | 132 | /* Set output filename and number */ |
Matt Kraai | 96dcd19 | 2001-04-18 15:54:09 +0000 | [diff] [blame] | 133 | if (flags & gunzip_test) { |
Glenn L McGrath | 58e42d5 | 2001-03-28 05:38:24 +0000 | [diff] [blame] | 134 | out_file = xfopen("/dev/null", "w"); /* why does test use filenum 2 ? */ |
Matt Kraai | 96dcd19 | 2001-04-18 15:54:09 +0000 | [diff] [blame] | 135 | } else if (flags & gunzip_to_stdout) { |
| 136 | out_file = stdout; |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 137 | } else { |
Glenn L McGrath | 58e42d5 | 2001-03-28 05:38:24 +0000 | [diff] [blame] | 138 | char *extension; |
| 139 | int length = strlen(if_name); |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 140 | |
Glenn L McGrath | 58e42d5 | 2001-03-28 05:38:24 +0000 | [diff] [blame] | 141 | delete_old_file = TRUE; |
| 142 | extension = strrchr(if_name, '.'); |
Matt Kraai | 5465223 | 2001-04-18 15:51:45 +0000 | [diff] [blame] | 143 | if (extension && strcmp(extension, ".gz") == 0) { |
Glenn L McGrath | 58e42d5 | 2001-03-28 05:38:24 +0000 | [diff] [blame] | 144 | length -= 3; |
Matt Kraai | 5465223 | 2001-04-18 15:51:45 +0000 | [diff] [blame] | 145 | } else if (extension && strcmp(extension, ".tgz") == 0) { |
Glenn L McGrath | 58e42d5 | 2001-03-28 05:38:24 +0000 | [diff] [blame] | 146 | length -= 4; |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 147 | } else { |
Glenn L McGrath | 58e42d5 | 2001-03-28 05:38:24 +0000 | [diff] [blame] | 148 | error_msg_and_die("Invalid extension"); |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 149 | } |
Glenn L McGrath | 58e42d5 | 2001-03-28 05:38:24 +0000 | [diff] [blame] | 150 | of_name = (char *) xcalloc(sizeof(char), length + 1); |
| 151 | strncpy(of_name, if_name, length); |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 152 | |
Glenn L McGrath | 58e42d5 | 2001-03-28 05:38:24 +0000 | [diff] [blame] | 153 | /* Open output file */ |
| 154 | out_file = xfopen(of_name, "w"); |
| 155 | |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 156 | /* Set permissions on the file */ |
Glenn L McGrath | 58e42d5 | 2001-03-28 05:38:24 +0000 | [diff] [blame] | 157 | chmod(of_name, stat_buf.st_mode); |
| 158 | } |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 159 | |
Glenn L McGrath | 58e42d5 | 2001-03-28 05:38:24 +0000 | [diff] [blame] | 160 | /* do the decompression, and cleanup */ |
| 161 | if (unzip(in_file, out_file) == 0) { |
| 162 | /* Success, remove .gz file */ |
| 163 | delete_file_name = if_name; |
| 164 | } else { |
| 165 | /* remove failed attempt */ |
| 166 | delete_file_name = of_name; |
| 167 | } |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 168 | |
Glenn L McGrath | 58e42d5 | 2001-03-28 05:38:24 +0000 | [diff] [blame] | 169 | fclose(out_file); |
| 170 | fclose(in_file); |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 171 | |
Glenn L McGrath | 58e42d5 | 2001-03-28 05:38:24 +0000 | [diff] [blame] | 172 | if (delete_old_file == TRUE) { |
| 173 | if (unlink(delete_file_name) < 0) { |
| 174 | error_msg_and_die("Couldnt remove %s", delete_file_name); |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 175 | } |
Eric Andersen | b052b47 | 1999-11-18 00:21:59 +0000 | [diff] [blame] | 176 | } |
Glenn L McGrath | 58e42d5 | 2001-03-28 05:38:24 +0000 | [diff] [blame] | 177 | |
| 178 | free(of_name); |
| 179 | |
| 180 | return(EXIT_SUCCESS); |
Eric Andersen | b052b47 | 1999-11-18 00:21:59 +0000 | [diff] [blame] | 181 | } |