// 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_std.inl

// 

//

#ifndef SL_STD_INL

#define SL_STD_INL

TBool IsPowerOf2(TUint32 aVal)

    {

	if (aVal==0)

		return EFalse;

    return !(aVal & (aVal-1));

    }

TUint32 Pow2(TUint32 aVal)

    {

        //ASSERT(aVal<32);

        return 1 << aVal;

    }

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

// class TEntryPos

TUint32 TEntryPos::Cluster() const 

    {

    return (TUint32) iCluster;

    }

TUint32 TEntryPos::Pos() const 

    {

    return (TUint32) iPos;

    }

TBool TEntryPos::operator==(const TEntryPos& aRhs) const

    {

    ASSERT(this != &aRhs);

    return (iCluster == aRhs.iCluster && iPos == aRhs.iPos);

    }

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

// class CFatMountCB

inline TInt CFatMountCB::RootDirectorySector() const

    {return iVolParam.RootDirectorySector();}

inline TUint CFatMountCB::RootDirEnd() const

    {return iVolParam.RootDirEnd();}

inline TUint32 CFatMountCB::RootClusterNum() const

    {return iVolParam.RootClusterNum(); }        

inline TInt CFatMountCB::StartCluster(const TFatDirEntry & anEntry) const

	{return anEntry.StartCluster();}

/**

returns true for root dir on Fat12/16 (fixed root dir versions of Fat). 

this function is used to handle special cases for reading/writing the root directory on FAT via the use of cluster zero.

@param aEntry position on volume being queried

@return Whether Root dir position or not

*/

TBool CFatMountCB::IsRootDir(const TEntryPos &aEntry) const

	{return((aEntry.iCluster==0) ? (TBool)ETrue : (TBool)EFalse);}

/**

Indicates the root directory cluster, For Fat12/16 root is always indicated by cluster number zero

@return The root cluster indicator

*/

TInt CFatMountCB::RootIndicator() const

	{return 0;}

TBool CFatMountCB::Is16BitFat() const

	{return(iFatType == EFat16);}

/** @return Log2 of cluster size on volume */

TInt CFatMountCB::ClusterSizeLog2() const

    {return(iVolParam.ClusterSizeLog2());}

/** @return Log2 of media sector size  */

TInt CFatMountCB::SectorSizeLog2() const

    {return(iVolParam.SectorSizeLog2());}

/** @return sector per cluster */

TInt CFatMountCB::SectorsPerCluster() const

    {return(1<<(iVolParam.ClusterSizeLog2()-iVolParam.SectorSizeLog2()));}

/** @return the base position of a cluster */

TInt CFatMountCB::ClusterBasePosition() const

	{return(iFirstFreeByte);}

/** @return the offset into a cluster of a byte address */

TInt CFatMountCB::ClusterRelativePos(TInt aPos) const

	{return(aPos&((1<<ClusterSizeLog2())-1));}

/**

Calculates the maximum number of clusters

@return  maximum number of clusters

*/

TUint32 CFatMountCB::MaxClusterNumber() const

    {return(TotalSectors()>>(ClusterSizeLog2()-SectorSizeLog2()));}

/** @return the the total sectors on volume */

TInt CFatMountCB::TotalSectors() const

    {return iVolParam.TotalSectors();}

/** @return total size of a Fat in bytes */

TInt CFatMountCB::FatSizeInBytes() const

    {return iVolParam.FatSizeInBytes();}

/** @return first sector of the Fat */

TUint32 CFatMountCB::FirstFatSector() const

    {return iVolParam.FirstFatSector();}

/** @return the byte offset of the Fat */

TInt CFatMountCB::StartOfFatInBytes() const

	{return(FirstFatSector()<<SectorSizeLog2());}

/** @return Number of Fats used by the volume */

TInt CFatMountCB::NumberOfFats() const

    {return iVolParam.NumberOfFats();}

/** @return refrence to the fat table owned by the mount */

CFatTable& CFatMountCB::FAT() const

	{return(*iFatTable);}

/**

Returns a refrence to the file system object owned by the coresponding TDrive for a drive used for creating subsession objects

@return refrence to file system object

*/

CFatFileSystem& CFatMountCB::FatFileSystem() const

	{return((CFatFileSystem&)Drive().FSys());}

/** @return  refrence to a raw disk object owned by the mount */

CRawDisk& CFatMountCB::RawDisk() const

	{return(*iRawDisk);}

/**

@return ETrue if aCluster value is bad cluster marker defined in FAT specification

*/

TBool CFatMountCB::IsBadCluster(TInt aCluster) const

	{return Is16BitFat() ? aCluster==0xFFF7 : aCluster==0xFF7;}

/**

Returns whether the current mount is running as rugged Fat or not, this is held in the file system object

@return Is rugged fat flag

*/

TBool CFatMountCB::IsRuggedFSys() const

	{return Drive().IsRugged();}

/**

Sets the rugged flag in the file system object

@param Flag to set or clear the rugged flag

*/

void CFatMountCB::SetRuggedFSys(TBool aVal)

	{Drive().SetRugged(aVal);}

/** @return the usable clusters count for a volume */

TUint32 CFatMountCB::UsableClusters() const

	{return(iUsableClusters);}

TUint CFatMountCB::StartOfRootDirInBytes() const

    {return iVolParam.RootDirectorySector()<<SectorSizeLog2();}

/** @return FAT type for this mount */

TFatType CFatMountCB::FatType() const

{

    return iFatType;

}

CAsyncNotifier* CFatMountCB::Notifier() const

	{return iNotifier;}	

/**

    Set or reset Read Only mode for the mount.

    @param    aReadOnlyMode if ETrue, the mount will be set RO.

*/

void  CFatMountCB::SetReadOnly(TBool aReadOnlyMode) 

{

    iReadOnly = aReadOnlyMode;

}

/**

    @return ETrue if the volume is in Read-Only state

*/

TBool CFatMountCB::ReadOnly(void) const

	{

    return iReadOnly;

	}

/** @return state of the CFatMountCB*/

CFatMountCB::TFatMntState CFatMountCB::State() const 

    {

    return iState;

    }

/** 

    Set state of the CFatMountCB

    @param  aState state to set

*/

void CFatMountCB::SetState(TFatMntState aState)

    {

    //__PRINT3(_L("#- CFatMountCB::SetState() drv:%d, %d->%d\n"),DriveNumber(),iState,aState);

    iState = aState;

    }

TFatDriveInterface& CFatMountCB::DriveInterface() const 

    {

    return (TFatDriveInterface&)iDriverInterface; 

    }

const TFatConfig& CFatMountCB::FatConfig() const 

    {

    return iFatConfig;

    }

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

/** 

Check if the XFileCreationHelper object is initialised.

*/

TBool CFatMountCB::XFileCreationHelper::IsInitialised() const 

	{

	return isInitialised;

	}

/** 

Get number of new entries for file creation.

*/

TUint16	CFatMountCB::XFileCreationHelper::NumOfAddingEntries() const

	{

	ASSERT(isInitialised); 

	return iNumOfAddingEntries;

	}

/** 

Get position of new entries for file creation.

*/

TEntryPos CFatMountCB::XFileCreationHelper::EntryAddingPos() const 

	{

	ASSERT(isInitialised); 

	return iEntryAddingPos;

	}

/** 

Check if position of new entries has been found.

*/

TBool CFatMountCB::XFileCreationHelper::IsNewEntryPosFound() const 

	{

	ASSERT(isInitialised); 

	return isNewEntryPosFound;

	}

/** 

Check if file name of the new file is a legal dos name.

*/

TBool CFatMountCB::XFileCreationHelper::IsTrgNameLegalDosName() const

	{

	ASSERT(isInitialised); 

	return isTrgNameLegalDosName;

	}

/** 

Set entry position for new entries to be added.

*/

void CFatMountCB::XFileCreationHelper::SetEntryAddingPos(const TEntryPos& aEntryPos) 

	{

	iEntryAddingPos = aEntryPos;

	}

/** 

Set condition if position of new entries has been found.

*/

void CFatMountCB::XFileCreationHelper::SetIsNewEntryPosFound(TBool aFound) 

	{

	isNewEntryPosFound = aFound;

	}

//-------  debug methods

#ifdef  _DEBUG

/**

Debug function indicates whether write fails are active or not, for test

@return ETrue if write fails on or not

*/

TBool CFatMountCB::IsWriteFail()const

	{return(iIsWriteFail);}

/**

Switches write fails on or off, for test

@param aIsWriteFail set true or false to set write fails on or off

*/

void CFatMountCB::SetWriteFail(TBool aIsWriteFail)

	{iIsWriteFail=aIsWriteFail;}

/** @return number of write fails to occur, for test */

TInt CFatMountCB::WriteFailCount()const

	{return(iWriteFailCount);}

/**

Set the number of Write fails 

@param aFailCount number of write fails, for test

*/

void CFatMountCB::SetWriteFailCount(TInt aFailCount)

	{iWriteFailCount=aFailCount;}

/** Decrement the number of write fails, for test */

void CFatMountCB::DecWriteFailCount()

	{--iWriteFailCount;}

/** @return Error for a write failure, for test */

TInt CFatMountCB::WriteFailError()const

	{return iWriteFailError;}

/**

Set the write fail error code, for test

@param aErrorValue The Error for a write fails

*/

void CFatMountCB::SetWriteFailError(TInt aErrorValue)

	{iWriteFailError=aErrorValue;}

#endif

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

// class CFatFormatCB

TBool CFatFormatCB::Is16BitFat() const

    {return(iFileSystemName==KFileSystemName16);}

CFatMountCB& CFatFormatCB::FatMount()

	{return *(CFatMountCB*)&Mount();}

/**

Returns the local drive used by the file systems from the owning mount

@return Pointer to the local drive 

*/

CProxyDrive* CFatFormatCB::LocalDrive()

	{return(FatMount().LocalDrive());}

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

// class CFatFileCB

/**

Returns the owning mount from file object

@return pointer to the owning mount object

*/

CFatMountCB& CFatFileCB::FatMount() const

	{return((CFatMountCB&)Mount());}

/**

Returns the fat table used by the file system for this mount

@return Refrence to the Fat table owned by the mount

*/

CFatTable& CFatFileCB::FAT()

	{return(FatMount().FAT());}

/**

Position with in a cluster for a given address

@param aPos Byte position 

*/

TInt CFatFileCB::ClusterRelativePos(TInt aPos)

	{return(FatMount().ClusterRelativePos(aPos));}

/**

Returns Log2 of cluster size from mount

@return cluster size

*/

TInt CFatFileCB::ClusterSizeLog2()

	{return(FatMount().ClusterSizeLog2());}

/*

 Note: this replaces SeekIndex() which was only used in sl_mnt

 to verify whether the seek index had been created/initialised

*/

inline TBool CFatFileCB::IsSeekIndex() const

{return (iSeekIndex==NULL?(TBool)EFalse:(TBool)ETrue); }

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

// class CFatDirCB

/**

Returns the owning mount from directory object

@return pointer to the owning mount object

*/

CFatMountCB& CFatDirCB::FatMount()

	{return((CFatMountCB&)Mount());}

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

// class CFatTable

TUint32 CFatTable::FreeClusters() const 

    {

    return iFreeClusters;

    }

TBool CFatTable::IsEof16Bit(TInt aCluster) const

	{return(aCluster>=0xFFF8 && aCluster<=0xFFFF);}

TBool CFatTable::IsEof12Bit(TInt aCluster) const

	{return(aCluster>=0xFF8 && aCluster<=0xFFF);}

TInt CFatTable::SectorSizeLog2() const

	{return(iOwner->SectorSizeLog2());}

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

inline TBool CFatTable::IsFat12() const 

    {

    return iFatType == EFat12;

    }

inline TBool CFatTable::IsFat16() const 

    {

    return iFatType == EFat16;

    }

inline TFatType CFatTable::FatType() const 

    {

    return iFatType;

    }

/**

@return Maximal number of addresable FAT entries. This value is taken from the owning mount

*/

inline TUint32 CFatTable::MaxEntries() const

    {

        ASSERT(iMaxEntries > 0);

        return iMaxEntries;

    }

// class TFatDriveInterface

TBool TFatDriveInterface::NotifyUser() const

	{return(iMount->GetNotifyUser());}

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

// class CRawDisk

/**

    Get pointer to the directory cache interface. Any client that reads/writes directory entries 

    MUST do it via this interface.

    Default implementation returns NULL

    @return     pointer to the MWTCacheInterface interface, or NULL if it is not present.

*/

MWTCacheInterface* CRawDisk::DirCacheInterface()

    {

    return NULL;

    }

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

//-- class RBitVector

/** @return size of the vector (number of bits) */

inline TUint32 RBitVector::Size() const

    {

    return iNumBits;

    } 

/**

    Get a bit by index

    @param aIndex  index in a bit vector

    @return 0 if the bit at pos aIndex is 0, not zero otherwise

    @panic EIndexOutOfRange if aIndex is out of range

*/

inline TBool RBitVector::operator[](TUint32 aIndex) const

    {

    __ASSERT_ALWAYS(aIndex < iNumBits, Panic(EIndexOutOfRange));

    return (ipData[WordNum(aIndex)] & (1<<BitInWord(aIndex)));

    }

/**

    Set a bit at pos aIndex to '1'

    @param aIndex  index in a bit vector

    @panic EIndexOutOfRange if aIndex is out of range

*/

inline void RBitVector::SetBit(TUint32 aIndex)

    {

    __ASSERT_ALWAYS(aIndex < iNumBits, Panic(EIndexOutOfRange));

    ipData[WordNum(aIndex)] |= (1<<BitInWord(aIndex));

    }

/**

    Set a bit at pos aIndex to '0'

    @param aIndex  index in a bit vector

    @panic EIndexOutOfRange if aIndex is out of range

*/

inline void RBitVector::ResetBit(TUint32 aIndex)

    {

    __ASSERT_ALWAYS(aIndex < iNumBits, Panic(EIndexOutOfRange));

    ipData[WordNum(aIndex)] &= ~(1<<BitInWord(aIndex));