| /* vi: set sw=4 ts=4: */ |
| /* |
| * Gzip implementation for busybox |
| * |
| * Based on GNU gzip v1.2.4 Copyright (C) 1992-1993 Jean-loup Gailly. |
| * |
| * Originally adjusted for busybox by Sven Rudolph <sr1@inf.tu-dresden.de> |
| * based on gzip sources |
| * |
| * Adjusted further by Erik Andersen <andersee@debian.org> to support files as |
| * well as stdin/stdout, and to generally behave itself wrt command line |
| * handling. |
| * |
| * General cleanup to better adhere to the style guide and make use of standard |
| * busybox functions by Glenn McGrath <bug1@optushome.com.au> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| * |
| * |
| * gzip (GNU zip) -- compress files with zip algorithm and 'compress' interface |
| * Copyright (C) 1992-1993 Jean-loup Gailly |
| * The unzip code was written and put in the public domain by Mark Adler. |
| * Portions of the lzw code are derived from the public domain 'compress' |
| * written by Spencer Thomas, Joe Orost, James Woods, Jim McKie, Steve Davies, |
| * Ken Turkowski, Dave Mack and Peter Jannesen. |
| * |
| * See the license_msg below and the file COPYING for the software license. |
| * See the file algorithm.doc for the compression algorithms and file formats. |
| */ |
| |
| #if 0 |
| static char *license_msg[] = { |
| " Copyright (C) 1992-1993 Jean-loup Gailly", |
| " This program is free software; you can redistribute it and/or modify", |
| " it under the terms of the GNU General Public License as published by", |
| " the Free Software Foundation; either version 2, or (at your option)", |
| " any later version.", |
| "", |
| " This program is distributed in the hope that it will be useful,", |
| " but WITHOUT ANY WARRANTY; without even the implied warranty of", |
| " MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the", |
| " GNU General Public License for more details.", |
| "", |
| " You should have received a copy of the GNU General Public License", |
| " along with this program; if not, write to the Free Software", |
| " Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.", |
| 0 |
| }; |
| #endif |
| |
| #include <stdlib.h> |
| #include <string.h> |
| #include <unistd.h> |
| #include <getopt.h> |
| #include "busybox.h" |
| |
| const char gunzip_to_stdout = 1; |
| const char gunzip_force = 2; |
| const char gunzip_test = 4; |
| |
| extern int gunzip_main(int argc, char **argv) |
| { |
| char status = EXIT_SUCCESS; |
| char flags = 0; |
| int opt; |
| |
| /* if called as zcat */ |
| if (strcmp(applet_name, "zcat") == 0) { |
| flags |= gunzip_to_stdout; |
| } |
| |
| while ((opt = getopt(argc, argv, "ctfhd")) != -1) { |
| switch (opt) { |
| case 'c': |
| flags |= gunzip_to_stdout; |
| break; |
| case 'f': |
| flags |= gunzip_force; |
| break; |
| case 't': |
| flags |= gunzip_test; |
| break; |
| case 'd': /* Used to convert gzip to gunzip. */ |
| break; |
| default: |
| show_usage(); /* exit's inside usage */ |
| } |
| } |
| |
| do { |
| FILE *in_file, *out_file; |
| struct stat stat_buf; |
| const char *old_path = argv[optind]; |
| const char *delete_path = NULL; |
| char *new_path = NULL; |
| |
| optind++; |
| |
| if (old_path == NULL || strcmp(old_path, "-") == 0) { |
| in_file = stdin; |
| flags |= gunzip_to_stdout; |
| } else { |
| in_file = wfopen(old_path, "r"); |
| if (in_file == NULL) { |
| status = EXIT_FAILURE; |
| break; |
| } |
| |
| /* Get the time stamp on the input file. */ |
| if (stat(old_path, &stat_buf) < 0) { |
| error_msg_and_die("Couldn't stat file %s", old_path); |
| } |
| } |
| |
| /* Check that the input is sane. */ |
| if (isatty(fileno(in_file)) && ((flags & gunzip_force) == 0)) { |
| error_msg_and_die |
| ("compressed data not read from terminal. Use -f to force it."); |
| } |
| |
| /* Set output filename and number */ |
| if (flags & gunzip_test) { |
| out_file = xfopen("/dev/null", "w"); /* why does test use filenum 2 ? */ |
| } else if (flags & gunzip_to_stdout) { |
| out_file = stdout; |
| } else { |
| char *extension; |
| |
| new_path = xstrdup(old_path); |
| |
| extension = strrchr(new_path, '.'); |
| if (extension && (strcmp(extension, ".gz") == 0)) { |
| *extension = '\0'; |
| } else if (extension && (strcmp(extension, ".tgz") == 0)) { |
| extension[2] = 'a'; |
| extension[3] = 'r'; |
| } else { |
| error_msg_and_die("Invalid extension"); |
| } |
| |
| /* Open output file */ |
| out_file = xfopen(new_path, "w"); |
| |
| /* Set permissions on the file */ |
| chmod(old_path, stat_buf.st_mode); |
| |
| /* If unzip succeeds remove the old file */ |
| delete_path = old_path; |
| } |
| |
| /* do the decompression, and cleanup */ |
| if ((unzip(in_file, out_file) != 0) && (new_path)) { |
| /* Unzip failed, remove new path instead of old path */ |
| delete_path = new_path; |
| } |
| |
| if (out_file != stdout) { |
| fclose(out_file); |
| } |
| if (in_file != stdin) { |
| fclose(in_file); |
| } |
| |
| /* delete_path will be NULL if in test mode or from stdin */ |
| if (delete_path && (unlink(delete_path) == -1)) { |
| error_msg_and_die("Couldn't remove %s", delete_path); |
| } |
| |
| free(new_path); |
| |
| } while (optind < argc); |
| |
| return status; |
| } |