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199 lines
5.8 KiB
C
199 lines
5.8 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Gzip implementation for busybox
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*
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* Based on GNU gzip v1.2.4 Copyright (C) 1992-1993 Jean-loup Gailly.
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*
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* Originally adjusted for busybox by Sven Rudolph <sr1@inf.tu-dresden.de>
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* based on gzip sources
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*
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* Adjusted further by Erik Andersen <andersen@codepoet.org> to support files as
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* well as stdin/stdout, and to generally behave itself wrt command line
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* handling.
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*
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* General cleanup to better adhere to the style guide and make use of standard
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* busybox functions by Glenn McGrath <bug1@iinet.net.au>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*
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* gzip (GNU zip) -- compress files with zip algorithm and 'compress' interface
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* Copyright (C) 1992-1993 Jean-loup Gailly
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* The unzip code was written and put in the public domain by Mark Adler.
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* Portions of the lzw code are derived from the public domain 'compress'
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* written by Spencer Thomas, Joe Orost, James Woods, Jim McKie, Steve Davies,
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* Ken Turkowski, Dave Mack and Peter Jannesen.
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*
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* See the license_msg below and the file COPYING for the software license.
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* See the file algorithm.doc for the compression algorithms and file formats.
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*/
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#if 0
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static char *license_msg[] = {
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" Copyright (C) 1992-1993 Jean-loup Gailly",
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" This program is free software; you can redistribute it and/or modify",
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" it under the terms of the GNU General Public License as published by",
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" the Free Software Foundation; either version 2, or (at your option)",
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" any later version.",
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"",
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" This program is distributed in the hope that it will be useful,",
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" but WITHOUT ANY WARRANTY; without even the implied warranty of",
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" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the",
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" GNU General Public License for more details.",
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"",
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" You should have received a copy of the GNU General Public License",
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" along with this program; if not, write to the Free Software",
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" Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.",
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0
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};
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#endif
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <getopt.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include "busybox.h"
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#include "unarchive.h"
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#define GUNZIP_OPT_STDOUT 1
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#define GUNZIP_OPT_FORCE 2
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#define GUNZIP_OPT_TEST 4
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#define GUNZIP_OPT_DECOMPRESS 8
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extern int gunzip_main(int argc, char **argv)
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{
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char status = EXIT_SUCCESS;
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unsigned long opt;
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opt = bb_getopt_ulflags(argc, argv, "cftd");
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/* if called as zcat */
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if (strcmp(bb_applet_name, "zcat") == 0) {
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opt |= GUNZIP_OPT_STDOUT;
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}
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do {
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struct stat stat_buf;
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const char *old_path = argv[optind];
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const char *delete_path = NULL;
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char *new_path = NULL;
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int src_fd;
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int dst_fd;
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optind++;
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if (old_path == NULL || strcmp(old_path, "-") == 0) {
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src_fd = STDIN_FILENO;
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opt |= GUNZIP_OPT_STDOUT;
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} else {
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src_fd = bb_xopen(old_path, O_RDONLY);
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/* Get the time stamp on the input file. */
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if (stat(old_path, &stat_buf) < 0) {
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bb_error_msg_and_die("Couldn't stat file %s", old_path);
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}
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}
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/* Check that the input is sane. */
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if (isatty(src_fd) && ((opt & GUNZIP_OPT_FORCE) == 0)) {
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bb_error_msg_and_die
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("compressed data not read from terminal. Use -f to force it.");
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}
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/* Set output filename and number */
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if (opt & GUNZIP_OPT_TEST) {
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dst_fd = bb_xopen("/dev/null", O_WRONLY); /* why does test use filenum 2 ? */
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} else if (opt & GUNZIP_OPT_STDOUT) {
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dst_fd = STDOUT_FILENO;
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} else {
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char *extension;
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new_path = bb_xstrdup(old_path);
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extension = strrchr(new_path, '.');
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#ifdef CONFIG_FEATURE_GUNZIP_UNCOMPRESS
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if (extension && (strcmp(extension, ".Z") == 0)) {
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*extension = '\0';
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} else
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#endif
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if (extension && (strcmp(extension, ".gz") == 0)) {
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*extension = '\0';
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} else if (extension && (strcmp(extension, ".tgz") == 0)) {
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extension[2] = 'a';
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extension[3] = 'r';
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} else {
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bb_error_msg_and_die("Invalid extension");
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}
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/* Open output file */
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dst_fd = bb_xopen(new_path, O_WRONLY | O_CREAT);
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/* Set permissions on the file */
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chmod(new_path, stat_buf.st_mode);
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/* If unzip succeeds remove the old file */
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delete_path = old_path;
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}
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/* do the decompression, and cleanup */
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if (bb_xread_char(src_fd) == 0x1f) {
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unsigned char magic2;
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magic2 = bb_xread_char(src_fd);
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#ifdef CONFIG_FEATURE_GUNZIP_UNCOMPRESS
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if (magic2 == 0x9d) {
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status = uncompress(src_fd, dst_fd);
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} else
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#endif
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if (magic2 == 0x8b) {
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check_header_gzip(src_fd);
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status = inflate_gunzip(src_fd, dst_fd);
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if (status != 0) {
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bb_error_msg_and_die("Error inflating");
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}
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} else {
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bb_error_msg_and_die("Invalid magic");
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}
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} else {
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bb_error_msg_and_die("Invalid magic");
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}
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if ((status != EXIT_SUCCESS) && (new_path)) {
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/* Unzip failed, remove new path instead of old path */
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delete_path = new_path;
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}
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if (dst_fd != STDOUT_FILENO) {
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close(dst_fd);
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}
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if (src_fd != STDIN_FILENO) {
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close(src_fd);
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}
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/* delete_path will be NULL if in test mode or from stdin */
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if (delete_path && (unlink(delete_path) == -1)) {
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bb_error_msg_and_die("Couldn't remove %s", delete_path);
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}
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free(new_path);
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} while (optind < argc);
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return status;
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}
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