Initial checkin. Mostly empty implementation of UDF 2.01 virtual partitions.

git-svn-id: file:///srv/svn/repos/haiku/trunk/current@5233 a95241bf-73f2-0310-859d-f6bbb57e9c96

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

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+#include "VirtualPartition.h"
+
+#define B_NOT_IMPLEMENTED B_ERROR
+
+using namespace Udf;
+
+/*! \brief Creates a new VirtualPartition object.
+
+	VirtualPartition objects require a valid VAT to be found on disc. This involves
+	looking up the last recorded sector on the disc (via the "READ CD RECORDED
+	CAPACITY" SCSI-MMC call (code 0x25)), which	should contain the file entry for
+	the VAT. Once found, the VAT can be loaded and accessed like a normal file.
+*/ 
+VirtualPartition::VirtualPartition(PhysicalPartition &physicalPartition)
+	: fPhysicalPartition(physicalPartition)
+{
+	// Find VAT
+}
+
+/*! \brief Destroys the VirtualPartition object.
+*/
+VirtualPartition::~VirtualPartition()
+{
+}
+
+/*! \brief Maps the given logical block to a physical block on disc.
+
+	The given logical block is indexed into the VAT. If a corresponding
+	mapped block exists, that block is mapped to a physical block via the
+	VirtualPartition object's physical partition.
+*/
+status_t
+VirtualPartition::MapBlock(uint32 logicalBlock, uint32 &physicalBlock)
+{
+	return B_NOT_IMPLEMENTED;
+}
+
+/*! Returns the initialization status of the object.
+*/
+status_t
+VirtualPartition::InitCheck()
+{
+	return B_NO_INIT;
+}

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

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+//----------------------------------------------------------------------
+//  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_VIRTUAL_PARTITION_H
+#define _UDF_VIRTUAL_PARTITION_H
+
+/*! \file VirtualPartition.h
+*/
+
+#include <kernel_cpp.h>
+
+#include "Partition.h"
+#include "PhysicalPartition.h"
+#include "UdfDebug.h"
+
+namespace Udf {
+
+/*! \brief Type 2 virtual partition
+
+	VirtualPartitions add an extra layer of indirection between logical
+	block numbers and physical block numbers, allowing the underlying
+	physical block numbers to be changed without changing the original
+	references to (virtual) logical block numbers.
+	
+	Note that VirtualPartitions should be found only on sequentially written
+	media such as CD-R, per UDF-2.01 2.2.10.
+
+	See also UDF-2.01 2.2.8, UDF-2.01 2.2.10
+*/ 
+class VirtualPartition : public Partition {
+public:
+	VirtualPartition(PhysicalPartition &physicalPartition);
+	virtual ~VirtualPartition();
+	virtual status_t MapBlock(uint32 logicalBlock, uint32 &physicalBlock);
+	
+	status_t InitCheck();
+private:
+	PhysicalPartition fPhysicalPartition;
+};
+
+};	// namespace Udf
+
+#endif	// _UDF_VIRTUAL_PARTITION_H