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Diffstat (limited to 'busybox/archival/gunzip.c')
| -rw-r--r-- | busybox/archival/gunzip.c | 198 |
1 files changed, 198 insertions, 0 deletions
diff --git a/busybox/archival/gunzip.c b/busybox/archival/gunzip.c new file mode 100644 index 0000000..beb7bd1 --- /dev/null +++ b/busybox/archival/gunzip.c @@ -0,0 +1,198 @@ +/* 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 <andersen@codepoet.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@iinet.net.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 <sys/types.h> +#include <sys/stat.h> +#include <fcntl.h> + +#include "busybox.h" +#include "unarchive.h" + +#define GUNZIP_OPT_STDOUT 1 +#define GUNZIP_OPT_FORCE 2 +#define GUNZIP_OPT_TEST 4 +#define GUNZIP_OPT_DECOMPRESS 8 + +extern int gunzip_main(int argc, char **argv) +{ + char status = EXIT_SUCCESS; + unsigned long opt; + + opt = bb_getopt_ulflags(argc, argv, "cftd"); + /* if called as zcat */ + if (strcmp(bb_applet_name, "zcat") == 0) { + opt |= GUNZIP_OPT_STDOUT; + } + + do { + struct stat stat_buf; + const char *old_path = argv[optind]; + const char *delete_path = NULL; + char *new_path = NULL; + int src_fd; + int dst_fd; + + optind++; + + if (old_path == NULL || strcmp(old_path, "-") == 0) { + src_fd = STDIN_FILENO; + opt |= GUNZIP_OPT_STDOUT; + } else { + src_fd = bb_xopen(old_path, O_RDONLY); + + /* Get the time stamp on the input file. */ + if (stat(old_path, &stat_buf) < 0) { + bb_error_msg_and_die("Couldn't stat file %s", old_path); + } + } + + /* Check that the input is sane. */ + if (isatty(src_fd) && ((opt & GUNZIP_OPT_FORCE) == 0)) { + bb_error_msg_and_die + ("compressed data not read from terminal. Use -f to force it."); + } + + /* Set output filename and number */ + if (opt & GUNZIP_OPT_TEST) { + dst_fd = bb_xopen("/dev/null", O_WRONLY); /* why does test use filenum 2 ? */ + } else if (opt & GUNZIP_OPT_STDOUT) { + dst_fd = STDOUT_FILENO; + } else { + char *extension; + + new_path = bb_xstrdup(old_path); + + extension = strrchr(new_path, '.'); +#ifdef CONFIG_FEATURE_GUNZIP_UNCOMPRESS + if (extension && (strcmp(extension, ".Z") == 0)) { + *extension = '\0'; + } else +#endif + if (extension && (strcmp(extension, ".gz") == 0)) { + *extension = '\0'; + } else if (extension && (strcmp(extension, ".tgz") == 0)) { + extension[2] = 'a'; + extension[3] = 'r'; + } else { + bb_error_msg_and_die("Invalid extension"); + } + + /* Open output file */ + dst_fd = bb_xopen(new_path, O_WRONLY | O_CREAT); + + /* Set permissions on the file */ + chmod(new_path, stat_buf.st_mode); + + /* If unzip succeeds remove the old file */ + delete_path = old_path; + } + + /* do the decompression, and cleanup */ + if (bb_xread_char(src_fd) == 0x1f) { + unsigned char magic2; + + magic2 = bb_xread_char(src_fd); +#ifdef CONFIG_FEATURE_GUNZIP_UNCOMPRESS + if (magic2 == 0x9d) { + status = uncompress(src_fd, dst_fd); + } else +#endif + if (magic2 == 0x8b) { + check_header_gzip(src_fd); + status = inflate_gunzip(src_fd, dst_fd); + if (status != 0) { + bb_error_msg_and_die("Error inflating"); + } + } else { + bb_error_msg_and_die("Invalid magic"); + } + } else { + bb_error_msg_and_die("Invalid magic"); + } + + if ((status != EXIT_SUCCESS) && (new_path)) { + /* Unzip failed, remove new path instead of old path */ + delete_path = new_path; + } + + if (dst_fd != STDOUT_FILENO) { + close(dst_fd); + } + if (src_fd != STDIN_FILENO) { + close(src_fd); + } + + /* delete_path will be NULL if in test mode or from stdin */ + if (delete_path && (unlink(delete_path) == -1)) { + bb_error_msg_and_die("Couldn't remove %s", delete_path); + } + + free(new_path); + + } while (optind < argc); + + return status; +} |