add open_read_close() and similar stuff

[oweals/busybox.git] / archival / libunarchive / get_header_tar_gz.c

diff --git a/archival/libunarchive/get_header_tar_gz.c b/archival/libunarchive/get_header_tar_gz.c
index c06beac9da748ca6979ee2fc5ecf799ce72222bc..af059a18718cc041f73beca3473f5d9b58f1d5f9 100644 (file)
--- a/archival/libunarchive/get_header_tar_gz.c
+++ b/archival/libunarchive/get_header_tar_gz.c
@@ -1,73 +1,31 @@
+/* vi: set sw=4 ts=4: */
 /*
- *  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 Library 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.
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
  */
 
-#include <sys/types.h>
-#include <signal.h>
-#include <stdio.h>
 #include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
+
 #include "libbb.h"
 #include "unarchive.h"
 
-extern char get_header_tar_gz(archive_handle_t *archive_handle)
+char get_header_tar_gz(archive_handle_t *archive_handle)
 {
-       int fd_pipe[2];
-       int pid;
-
-       check_header_gzip(archive_handle->src_fd);
+       unsigned char magic[2];
 
-       if (pipe(fd_pipe) != 0) {
-               error_msg_and_die("Can't create pipe\n");
-       }
-
-       pid = fork();
-       if (pid == -1) {
-               error_msg_and_die("Fork failed\n");
-       }
+       /* Cant lseek over pipe's */
+       archive_handle->seek = seek_by_read;
 
-       if (pid == 0) {
-               /* child process */
-           close(fd_pipe[0]); /* We don't wan't to read from the pipe */
-           inflate(archive_handle->src_fd, fd_pipe[1]);
-               check_trailer_gzip(archive_handle->src_fd);
-           close(fd_pipe[1]); /* Send EOF */
-           exit(0);
-           /* notreached */
+       xread(archive_handle->src_fd, &magic, 2);
+       if ((magic[0] != 0x1f) || (magic[1] != 0x8b)) {
+               bb_error_msg_and_die("invalid gzip magic");
        }
-       /* parent process */
-       close(fd_pipe[1]); /* Don't want to write down the pipe */
-       close(archive_handle->src_fd);
 
-       archive_handle->src_fd = fd_pipe[0];
+       check_header_gzip(archive_handle->src_fd);
 
-       while (get_header_tar(archive_handle) == EXIT_SUCCESS);
-
-       if (kill(pid, SIGTERM) == -1) {
-               error_msg_and_die("Couldnt kill gunzip process");
-       }
-       
-       /* I dont think this is needed */
-#if 0
-       if (waitpid(pid, NULL, 0) == -1) {
-               error_msg("Couldnt wait ?");
-       }
-#endif
+       archive_handle->src_fd = open_transformer(archive_handle->src_fd, inflate_gunzip);
+       archive_handle->offset = 0;
+       while (get_header_tar(archive_handle) == EXIT_SUCCESS) /**/;
 
        /* Can only do one file at a time */
-       return(EXIT_FAILURE);
+       return EXIT_FAILURE;
 }
-