New common unarchive code.

archival/libunarchive/unpack_ar_archive.c

@@ -0,0 +1,34 @@
+/*
+ *  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 <fcntl.h>
+#include <stdlib.h>
+#include <string.h>
+#include <getopt.h>
+#include "unarchive.h"
+#include "busybox.h"
+
+extern void unpack_ar_archive(archive_handle_t *ar_archive)
+{
+	char magic[7];
+
+	xread_all(ar_archive->src_fd, magic, 7);
+	if (strncmp(magic, "!<arch>", 7) != 0) {
+		error_msg_and_die("Invalid ar magic");
+	}
+	ar_archive->offset += 7;
+
+	while (get_header_ar(ar_archive) == EXIT_SUCCESS);
+}