New common unarchive code.

archival/libunarchive/get_header_tar_gz.c

@@ -0,0 +1,73 @@
+/*
+ *  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.
+ */
+
+#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)
+{
+	int fd_pipe[2];
+	int pid;
+
+	check_header_gzip(archive_handle->src_fd);
+
+	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");
+	}
+
+	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 */
+	}
+	/* 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];
+
+	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
+
+	/* Can only do one file at a time */
+	return(EXIT_FAILURE);
+}
+