Udf utility functions

- Added vnode_id to udf_long_address (and vice-versa) conversion functions


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@3938 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/add-ons/kernel/file_systems/udf/Utils.cpp

@@ -0,0 +1,33 @@
+//----------------------------------------------------------------------
+//  This software is part of the OpenBeOS distribution and is covered 
+//  by the OpenBeOS license.
+//
+//  Copyright (c) 2003 Tyler Dauwalder, tyler@dauwalder.net
+//---------------------------------------------------------------------
+
+/*! \file Utils.cpp
+
+	Miscellaneous Udf utility functions.
+*/
+
+#include "Utils.h"
+
+namespace Udf {
+
+udf_long_address
+to_long_address(vnode_id id, uint32 length)
+{
+	udf_long_address result;
+	result.set_block(id & 0xffff00);
+	result.set_partition(id & 0xff);
+	result.set_length(length);
+	return result;
+}
+
+vnode_id
+to_vnode_id(udf_long_address address)
+{
+	return (address.block() << 16) & (address.partition());
+}
+
+} // namespace Udf

src/add-ons/kernel/file_systems/udf/Utils.h

@@ -0,0 +1,34 @@
+//----------------------------------------------------------------------
+//  This software is part of the OpenBeOS distribution and is covered 
+//  by the OpenBeOS license.
+//
+//  Copyright (c) 2003 Tyler Dauwalder, tyler@dauwalder.net
+//---------------------------------------------------------------------
+#ifndef _UDF_UTILS_H
+#define _UDF_UTILS_H
+
+/*! \file Utils.h
+
+	Miscellaneous Udf utility functions.
+*/
+
+extern "C" {
+	#ifndef _IMPEXP_KERNEL
+	#	define _IMPEXP_KERNEL
+	#endif
+	
+	#include <fsproto.h>
+}
+
+#include "DiskStructures.h"
+
+namespace Udf {
+
+udf_long_address to_long_address(vnode_id id, uint32 length = 0);
+
+vnode_id to_vnode_id(udf_long_address address);
+
+} // namespace Udf
+
+#endif	// _UDF_UTILS_H
+