// Copyright (c) 1996-2009 Nokia Corporation and/or its subsidiary(-ies).

// All rights reserved.

// This component and the accompanying materials are made available

// under the terms of the License "Eclipse Public License v1.0"

// which accompanies this distribution, and is available

// at the URL "http://www.eclipse.org/legal/epl-v10.html".

//

// Initial Contributors:

// Nokia Corporation - initial contribution.

//

// Contributors:

//

// Description:

// f32\sfat\inc\sl_bpb.h

// @file

// @internalTechnology

// 

//

#ifndef SL_BPB_H 

#define SL_BPB_H

#include "filesystem_fat.h"

using FileSystem_FAT::TFatSubType;

typedef TFatSubType TFatType;

const TInt KVolumeLabelSize			=11;    ///< Volume lable size

const TInt KFileSysTypeSize			=8;     ///< File system type parameter size

const TInt KVendorIdSize			=8;     ///< Vendor ID parameter size

const TInt KBootSectorSignature		=0xAA55;///< File system Boot sector signiture

const TInt KSizeOfFatBootSector	    =62;    ///< Size in bytes of Boot sector parameter block (BPB), 62 for fat16|12

const TInt KFat16VolumeLabelPos     =43;    ///< Position of volume lable in BPB for Fat12/16

const TUint32 KBootSectorNum        =0;     ///< Main Boot Sector number (always 0)

//-------------------------------------------------------------------------------------------------------------------

/**

Boot sector parameter block, enables access to all file system parameters.

Data is populated at mount time from the BPB sector

*/

class TFatBootSector

	{

public:

    //-- simple getters / setters

	inline const TPtrC8 VendorId() const;

	inline TInt BytesPerSector() const;

	inline TInt SectorsPerCluster() const;

	inline TInt ReservedSectors() const;

	inline TInt NumberOfFats() const;

	inline TInt RootDirEntries() const;

	inline TInt TotalSectors() const;

	inline TUint8 MediaDescriptor() const;

	inline TInt FatSectors() const;

	inline TInt SectorsPerTrack() const;

	inline TInt NumberOfHeads() const;

	inline TInt HiddenSectors() const;

	inline TInt HugeSectors() const;

	inline TInt PhysicalDriveNumber() const;

	inline TInt ExtendedBootSignature() const;

	inline TUint32 UniqueID() const;

	inline const TPtrC8 VolumeLabel() const;

	inline const TPtrC8 FileSysType() const;

	inline TInt BootSectorSignature() const;

    inline TUint32 RootClusterNum() const  {return 0;} //-- dummy	

	inline TUint16 FSInfoSectorNum() const {return 0;} //-- dummy	

	inline TUint16 BkBootRecSector() const {return 0;} //-- dummy	

	inline void SetJumpInstruction();

	inline void SetVendorID(const TDesC8& aDes);

	inline void SetBytesPerSector(TInt aBytesPerSector);

	inline void SetSectorsPerCluster(TInt aSectorsPerCluster);

	inline void SetReservedSectors(TInt aReservedSectors);

	inline void SetNumberOfFats(TInt aNumberOfFats);

	inline void SetRootDirEntries(TInt aRootDirEntries);

	inline void SetTotalSectors(TInt aTotalSectors);

	inline void SetMediaDescriptor(TUint8 aMediaDescriptor);

	inline void SetFatSectors(TInt aFatSectors);

	inline void SetSectorsPerTrack(TInt aSectorsPerTrack);

	inline void SetNumberOfHeads(TInt aNumberOfHeads);

	inline void SetHiddenSectors(TUint32 aHiddenSectors);

	inline void SetHugeSectors(TUint32 aTotalSectors);

	inline void SetPhysicalDriveNumber(TInt aPhysicalDriveNumber);

	inline void SetReservedByte(TUint8 aReservedByte);

	inline void SetExtendedBootSignature(TInt anExtendedBootSignature);

	inline void SetUniqueID(TUint32 anUniqueID);

	inline void SetVolumeLabel(const TDesC8& aDes);

	inline void SetFileSysType(const TDesC8& aDes);

public:

    TFatBootSector();

    void Initialise();

    TBool IsValid() const;

    TFatType FatType(void) const;

    void Internalize(const TDesC8& aBuf);

    void Externalize(TDes8& aBuf) const;

	void PrintDebugInfo() const;

    //-- more advanced API, works for all FAT types

    TInt FirstFatSector() const;

    TInt RootDirStartSector() const;

	TInt FirstDataSector() const;

    TUint32 VolumeTotalSectorNumber() const;

    TUint32 TotalFatSectors() const;

    TUint32 RootDirSectors() const;

protected:

    TUint8  iJumpInstruction[3];            ///< +0         Jump instruction used for bootable volumes

    TUint8  iVendorId[KVendorIdSize];       ///< +3         Vendor ID of the file system that formatted the volume

    TUint16 iBytesPerSector;                ///< +11/0x0b   Bytes per sector 

    TUint8  iSectorsPerCluster;             ///< +13/0x0d   Sectors per cluster ratio

    TUint16 iReservedSectors;               ///< +14/0x0e   Number of reserved sectors on the volume

    TUint8  iNumberOfFats;                  ///< +16/0x10   Number of Fats on the volume

    TUint16 iRootDirEntries;	            ///< +17/0x11   Number of entries allowed in the root directory, specific to Fat12/16, zero for FAT32

    TUint16 iTotalSectors;                  ///< +19/0x13   Total sectors on the volume, zero for FAT32

    TUint8  iMediaDescriptor;               ///< +12/0x15   Media descriptor

    TUint16 iFatSectors;                    ///< +22/0x16   Sectors used for the Fat table, zero for FAT32

    TUint16 iSectorsPerTrack;               ///< +24/0x18   Sectors per track

    TUint16 iNumberOfHeads;                 ///< +26/0x1a   Number of heads 

    TUint32 iHiddenSectors;                 ///< +28/0x1c   Number of hidden sectors in the volume

    TUint32 iHugeSectors;                   ///< +32/0x20   Total sectors in the volume, Used if totalSectors > 65535

	//this is (boot sector) offset 36 for FAT12 and 16 but comes after additional FAT36 elements

	TUint8 iPhysicalDriveNumber;            ///< +36/0x24   Physical drive number, not used in Symbian OS

    TUint8 iReserved;                       ///< +37/0x25   Reserved byte

    TUint8 iExtendedBootSignature;          ///< +38/0x26   Extended boot signiture

    TUint32 iUniqueID;                      ///< +39/0x27   Unique volume ID

    TUint8 iVolumeLabel[KVolumeLabelSize];  ///< +43/0x2b   The volume's label

	TUint8 iFileSysType[KFileSysTypeSize];  ///< +54/0x36   File system type

	};

#endif //SL_BPB_H