Directory iterators.

git-svn-id: file:///srv/svn/repos/haiku/trunk/current@3939 a95241bf-73f2-0310-859d-f6bbb57e9c96

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

@@ -0,0 +1,50 @@
+//----------------------------------------------------------------------
+//  This software is part of the OpenBeOS distribution and is covered 
+//  by the OpenBeOS license.
+//
+//  Copyright (c) 2003 Tyler Dauwalder, tyler@dauwalder.net
+//---------------------------------------------------------------------
+
+/*! \file DirectoryIterator.cpp
+*/
+
+#include "DirectoryIterator.h"
+
+using namespace Udf;
+
+status_t
+DirectoryIterator::GetNextEntry(vnode_id *id, char *name, uint32 *length)
+{
+	if (!id || !name || !length)
+		return B_BAD_VALUE;
+
+	if (fCount < 5) 
+		sprintf(name, "entry #%d", fCount++);
+	else 
+		return B_ENTRY_NOT_FOUND;
+		
+	return B_OK;
+}
+
+/*	\brief Rewinds the iterator to point to the first
+	entry in the directory.
+*/
+void
+DirectoryIterator::Rewind()
+{
+	fCount = 0;
+}
+
+DirectoryIterator::DirectoryIterator(Icb *parent)
+	: fParent(parent)
+	, fCount(0)
+{
+}
+
+void
+DirectoryIterator::Invalidate()
+{
+	fParent = NULL;
+}
+ 
+

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

@@ -0,0 +1,49 @@
+//----------------------------------------------------------------------
+//  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_DIRECTORY_ITERATOR_H
+#define _UDF_DIRECTORY_ITERATOR_H
+
+/*! \file DirectoryIterator.h
+*/
+
+extern "C" {
+	#ifndef _IMPEXP_KERNEL
+	#	define _IMPEXP_KERNEL
+	#endif
+	
+	#include <fsproto.h>
+}
+
+#include "cpp.h"
+#include "UdfDebug.h"
+
+namespace Udf {
+
+class Icb;
+
+class DirectoryIterator {
+public:
+
+	status_t GetNextEntry(vnode_id *id, char *name, uint32 *length);
+	void Rewind();
+	
+	Icb* Parent() const { return fParent; }
+	
+private:
+	friend class Icb;
+
+	DirectoryIterator();				// unimplemented
+	DirectoryIterator(Icb *parent);		// called by Icb::GetDirectoryIterator()
+	void Invalidate();					// called by Icb::~Icb() 
+
+	Icb *fParent;
+	uint32 fCount;						// Used to implement fake iteration until file reading is implemented
+};
+
+};	// namespace Udf
+
+#endif	// _UDF_DIRECTORY_ITERATOR_H