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164 lines
4.5 KiB
C
164 lines
4.5 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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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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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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#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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#define GUNZIP_OPT_VERBOSE 0x10
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int gunzip_main(int argc, char **argv);
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int gunzip_main(int argc, char **argv)
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{
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USE_DESKTOP(long long) int status;
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int exitcode = 0;
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unsigned opt;
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opt = getopt32(argc, argv, "cftdv");
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/* if called as zcat */
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if (strcmp(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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char *old_path = argv[optind];
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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 || LONE_DASH(old_path)) {
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src_fd = STDIN_FILENO;
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opt |= GUNZIP_OPT_STDOUT;
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USE_DESKTOP(opt &= ~GUNZIP_OPT_VERBOSE;)
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optind = argc; /* we don't handle "gunzip - a.gz b.gz" */
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} else {
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src_fd = xopen(old_path, O_RDONLY);
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/* Get the time stamp on the input file. */
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fstat(src_fd, &stat_buf);
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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)) {
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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 = xopen(bb_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 = 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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// FIXME: should we die or just skip to next?
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bb_error_msg_and_die("invalid extension");
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}
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/* Open output file (with correct permissions) */
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dst_fd = xopen3(new_path, O_WRONLY | O_CREAT | O_TRUNC,
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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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status = -1;
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/* do the decompression, and cleanup */
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if (xread_char(src_fd) == 0x1f) {
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unsigned char magic2;
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magic2 = xread_char(src_fd);
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if (ENABLE_FEATURE_GUNZIP_UNCOMPRESS && magic2 == 0x9d) {
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status = uncompress(src_fd, dst_fd);
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} else if (magic2 == 0x8b) {
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check_header_gzip(src_fd); // FIXME: xfunc? _or_die?
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status = inflate_gunzip(src_fd, dst_fd);
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} else {
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bb_error_msg("invalid magic");
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exitcode = 1;
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}
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if (status < 0) {
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bb_error_msg("error inflating");
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exitcode = 1;
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}
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else if (ENABLE_DESKTOP && (opt & GUNZIP_OPT_VERBOSE)) {
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fprintf(stderr, "%s: %u%% - replaced with %s\n",
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old_path, (unsigned)(stat_buf.st_size*100 / (status+1)), new_path);
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}
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} else {
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bb_error_msg("invalid magic");
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exitcode = 1;
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}
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if (status < 0 && 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("cannot remove %s", delete_path);
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exitcode = 1;
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}
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free(new_path);
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} while (optind < argc);
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return exitcode;
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}
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