mirror of
https://github.com/sheumann/hush.git
synced 2024-07-10 13:29:00 +00:00
d921b2ecc0
things like xasprintf() into xfuncs.c, remove xprint_file_by_name() (it only had one user), clean up lots of #includes... General cleanup pass. What I've been doing for the last couple days. And it conflicts! I've removed httpd.c from this checkin due to somebody else touching that file. It builds for me. I have to catch a bus. (Now you know why I'm looking forward to Mercurial.)
153 lines
4.1 KiB
C
153 lines
4.1 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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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 = xopen(old_path, O_RDONLY);
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/* Get the time stamp on the input file. */
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xstat(old_path, &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) == 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 = 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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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, 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 (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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#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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