// 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\sl_fmt.cpp

// 

//

#include "sl_std.h"

#include <e32hal.h>

//

// Returns the total available ram from UserHal:: or sets an

// arbitrary limit upon the WINS ramdisk.

//

static TInt64 GetRamDiskSizeInBytes()

	{

#if defined(__EPOC32__)

	TMemoryInfoV1Buf memInfo;

	UserHal::MemoryInfo(memInfo);

	TUint max = memInfo().iTotalRamInBytes; // not really the correct max

	return max;

#else

    const TInt KArbitraryWinsRamDiskSize=0x400000;  //-- Default size for a Ram drive, 4MB

	return(KArbitraryWinsRamDiskSize);

#endif

	}

CFatFormatCB::CFatFormatCB()

	{

	__PRINT1(_L("CFatFormatCB::CFatFormatCB() [%x]"),this);

    }

CFatFormatCB::~CFatFormatCB()

	{

	__PRINT1(_L("CFatFormatCB::~CFatFormatCB() [%x]"),this);

    iBadSectors.Close();

	iBadClusters.Close();

	}

TInt CFatFormatCB::MaxFat16Sectors() const

//

// Calculate the size of a 16 bit FAT

//

	{

	TInt fatSizeInBytes=(2*iMaxDiskSectors)/iSectorsPerCluster+(iBytesPerSector-1);

	return(fatSizeInBytes/iBytesPerSector);

	}

TInt CFatFormatCB::MaxFat12Sectors() const

//

// Calculate the size of a 12 bit FAT

//

	{

	TInt maxDiskClusters=iMaxDiskSectors/iSectorsPerCluster;

	TInt fatSizeInBytes=maxDiskClusters+(maxDiskClusters>>1)+(iBytesPerSector-1);

	return(fatSizeInBytes/iBytesPerSector);

	}

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

/**

    Fill a media range from aStartPos to aEndPos with zeroes.

    @param  aStartPos   start media position

    @param  aEndPos     end media position

*/

void CFatFormatCB::DoZeroFillMediaL(TInt64 aStartPos, TInt64 aEndPos)

    {

    ASSERT(aStartPos <= aEndPos && aStartPos >=0  && aEndPos >=0);

    RBuf8 buf;

    CleanupClosePushL(buf);

    const TInt KBufMaxSz=32768; //-- zero-buffer Maximal size, bytes

    const TInt KBufMinSz=512;   //-- zero-buffer minimal size, bytes

    if(buf.CreateMax(KBufMaxSz) != KErrNone)

        {

        buf.CreateMaxL(KBufMinSz); //-- OOM, try to create smaller buffer

        }

    buf.FillZ();

    TInt64 rem = aEndPos - aStartPos;

    while(rem)

        {

        const TUint32 bytesToWrite=(TUint32)Min(rem, buf.Size());

        TPtrC8 ptrData(buf.Ptr(), bytesToWrite);

        User::LeaveIfError(LocalDrive()->Write(aStartPos, ptrData));

        aStartPos+=bytesToWrite;

        rem-=bytesToWrite;

        }

    CleanupStack::PopAndDestroy(&buf); 

    }

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

static TInt DiskSizeInSectorsL(TInt64 aSizeInBytes)

	{

    const TInt64 totalSectors64=aSizeInBytes>>KDefSectorSzLog2;

	const TInt   totalSectors32=I64LOW(totalSectors64);

    __PRINT2(_L("Disk size:%LU, max disk sectors:%d"),aSizeInBytes, totalSectors32);

    return totalSectors32;

	}

/**

    suggest FAT type according to the FAT volume metrics

    @return calculated FAT type

*/

TFatType CFatFormatCB::SuggestFatType() const

{

    const TUint32 rootDirSectors = (iRootDirEntries*KSizeOfFatDirEntry + (iBytesPerSector-1)) / iBytesPerSector;

    const TUint32 dataSectors = iMaxDiskSectors - (iReservedSectors + (iNumberOfFats * iSectorsPerFat) + rootDirSectors);

    const TUint32 clusterCnt = dataSectors/ iSectorsPerCluster;

    //-- magic. see FAT specs for details.

    if(clusterCnt < 4085)

        return EFat12;

    else if(clusterCnt < 65525)

        return EFat16;

    else

        return EFat32;

}

/**

    Initialize format data.

*/

void CFatFormatCB::InitializeFormatDataL()

	{

	__PRINT1(_L("CFatFormatCB::InitializeFormatDataL() drv:%d"), Drive().DriveNumber());

	TLocalDriveCapsV6Buf caps;

	User::LeaveIfError(LocalDrive()->Caps(caps));

	iVariableSize=((caps().iMediaAtt)&KMediaAttVariableSize) ? (TBool)ETrue : (TBool)EFalse;

	iBytesPerSector=KDefaultSectorSize;

	iSectorSizeLog2 = Log2(iBytesPerSector);

	iHiddenSectors=caps().iHiddenSectors;	

	iNumberOfHeads=2;

	iSectorsPerTrack=16;

    if (iVariableSize)

		{// Variable size implies ram disk

		iMaxDiskSectors=DiskSizeInSectorsL(GetRamDiskSizeInBytes());

		InitFormatDataForVariableSizeDisk(iMaxDiskSectors);

		}

	else

		{//-- fixed-size media

        iMaxDiskSectors=DiskSizeInSectorsL(caps().iSize);

        __PRINT3(_L("::InitializeFormatDataL() iMode:0x%x, ilen:%d, extrai:%d"), iMode, iSpecialInfo.Length(), caps().iExtraInfo);

        if(iMode & ESpecialFormat)

		    {

		    if(iSpecialInfo.Length())

			    {

                if (caps().iExtraInfo)  // conflict between user and media

                    User::Leave(KErrNotSupported);

			    else  // User-specified

                    User::LeaveIfError(InitFormatDataForFixedSizeDiskUser(iMaxDiskSectors));

                }

    		else

    		    {

                if (caps().iExtraInfo)

                    User::LeaveIfError(InitFormatDataForFixedSizeDiskCustom(caps().iFormatInfo));

                else

    			    User::LeaveIfError(InitFormatDataForFixedSizeDiskNormal(iMaxDiskSectors, caps()));

                }

		    }

        else //if(iMode & ESpecialFormat)

            {

            // Normal format with default values

            //  - Media with special format requirements will always use them

            //    even without the ESpecialFormat option.

            if(caps().iExtraInfo)

	            User::LeaveIfError(InitFormatDataForFixedSizeDiskCustom(caps().iFormatInfo));

            else

	            User::LeaveIfError(InitFormatDataForFixedSizeDiskNormal(iMaxDiskSectors, caps()));

		    }

        } //else(iVariableSize)

	}

/**

    Initialize the format parameters for a variable sized disk

    @param  aDiskSizeInSectors volume size in sectors

    @return standard error code

*/

TInt  CFatFormatCB::InitFormatDataForVariableSizeDisk(TInt aDiskSizeInSectors)

	{

	iNumberOfFats=2; // 1 FAT 1 Indirection table (FIT)

	iReservedSectors=1;

	iRootDirEntries=2*(4*KDefaultSectorSize)/sizeof(SFatDirEntry);

	TInt minSectorsPerCluster=(aDiskSizeInSectors+KMaxFAT16Entries-1)/KMaxFAT16Entries;

	iSectorsPerCluster=1;

	while (minSectorsPerCluster>iSectorsPerCluster)

		iSectorsPerCluster<<=1;

	__PRINT1(_L("iSectorsPerCluster = %d"),iSectorsPerCluster);

	iSectorsPerFat=MaxFat16Sectors();

	__PRINT1(_L("iSectorsPerFat = %d"),iSectorsPerFat);

	iFileSystemName=KFileSystemName16;

	return KErrNone;

	}

TInt CFatFormatCB::HandleCorrupt(TInt aError)

//

// Handle disk corrupt during format. It needs media driver's support.

// Media driver should handle DLocalDrive::EGetLastErrorInfo request in

// its Request function, filling in proper error information.

// @see TErrorInfo

//

    {

	__PRINT2(_L("CFatFormatCB::HandleCorrupt(%d) drv:%d"), aError, Drive().DriveNumber());

    TPckgBuf<TErrorInfo> info;

	TInt r = LocalDrive()->GetLastErrorInfo(info);

    if(r != KErrNone)

        {

        __PRINT1(_L("....GetLastErrorInfo() err:%d"), r);

        }

    if (r == KErrNotSupported)

		return KErrCorrupt;

    else if (r != KErrNone)

        return r;

    __PRINT3(_L("....TErrorInfo iReasonCode:%d, iErrorPos:%LU, iOtherInfo:%d"), info().iReasonCode, info().iErrorPos, info().iOtherInfo);

    // if no error reported by GetLastErrorInfo(), return the original error

	if (info().iReasonCode == KErrNone)

		return aError;

    if (info().iReasonCode!=KErrNone && info().iReasonCode!=TErrorInfo::EBadSector)

        return info().iReasonCode;

    // First bad sector met

    TInt sectorsDone = (TInt)(info().iErrorPos >> iSectorSizeLog2);

    TInt badSector = iFormatInfo.i512ByteSectorsFormatted + sectorsDone;

    iBadSectors.Append(badSector);

    // Update format information

    iFormatInfo.i512ByteSectorsFormatted += sectorsDone+1;

    return KErrNone;

    }

void CFatFormatCB::TranslateL()

//

// Change bad cluster number to new value with regard to new format parameters

//

    {

    if (iDiskCorrupt || !(iMode & EQuickFormat))

        return;

    TInt size = 1 << FatMount().ClusterSizeLog2();

    TUint8* readBuf = new(ELeave) TUint8[size];

    TPtr8 readBufPtr(readBuf, size);

    RArray<TInt> newArray;

    TInt r = DoTranslate(readBufPtr, newArray);

    delete[] readBuf;

    newArray.Close();

    User::LeaveIfError(r);

    }

#define calcSector(n) (n+oFirstFreeSector-nFirstFreeSector)

TInt CFatFormatCB::DoTranslate(TPtr8& aBuf, RArray<TInt>& aArray)

    {

    TInt r = KErrNone;

    // old format parameters

    TInt oFirstFreeSector = iOldFirstFreeSector;

    TInt oSectorsPerCluster = iOldSectorsPerCluster;

    // new format parameters

    TInt nFirstFreeSector = FatMount().iFirstFreeByte>>FatMount().SectorSizeLog2();

    TInt nSectorsPerCluster = FatMount().SectorsPerCluster();

    if (oFirstFreeSector==nFirstFreeSector && oSectorsPerCluster==nSectorsPerCluster)

        return r;

    TInt i;

    for (i=0; i<iBadClusters.Count(); ++i)

        {

        /*

        Cluster boundary may change due to format parameter change.

        Old: |-- ... --|----|----|----|----|----|----|----|

                       |<-          Data area           ->|

        New: |--- ... ---|------|------|------|------|------|

                         |<-           Data area          ->|

        */

        TInt begSector = calcSector((iBadClusters[i]-2)*oSectorsPerCluster);

        begSector = Max(begSector, nFirstFreeSector);

        TInt endSector = calcSector(((iBadClusters[i]-1)*oSectorsPerCluster)-1);

        endSector = Max(endSector, nFirstFreeSector);

        TInt begCluster = (begSector/iSectorsPerCluster)+KFatFirstSearchCluster;

        TInt endCluster = (endSector/iSectorsPerCluster)+KFatFirstSearchCluster;

        if (begCluster == endCluster)  // old cluster is in a new cluster

            {

            if (aArray.Find(begCluster) == KErrNotFound)

                if ((r=aArray.Append(begCluster)) != KErrNone)

                    return r;

            continue;

            }

        // deal with old cluster cross over several new clusters

        TInt offset = (begSector-(begCluster-2)*iSectorsPerCluster)<<iSectorSizeLog2;

        TInt len = (endSector-(endCluster-2)*iSectorsPerCluster)<<iSectorSizeLog2;

        TInt j;

        for (j=begCluster; j<=endCluster; ++j)

        // Because each old bad cluster cross several new clusters,

        // we have to verify which new cluster is bad really

            {

            TInt addr = (nFirstFreeSector+(j-2)*iSectorsPerCluster)<<iSectorSizeLog2;

            TInt clusterLen = (1<<iSectorSizeLog2) * iSectorsPerCluster;

            if (j == begCluster)

                r = LocalDrive()->Read(addr+offset,clusterLen-offset,aBuf);

            else if (j == endCluster && len)

                r = LocalDrive()->Read(addr,len,aBuf);

            else

                r = LocalDrive()->Read(addr,clusterLen,aBuf);

            if (r == KErrCorrupt) // new cluster j is corrupt

                if ((r=aArray.Append(j)) != KErrNone)

                    return r;

            }

        }

    // Update iBadClusters with aArray

    iBadClusters.Reset();

    for (i=0; i<aArray.Count(); ++i)

        if ((r=iBadClusters.Append(aArray[i])) != KErrNone)

            return r;

    iBadClusters.Sort();

    return r;

    }

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

/** override from CFormatCB, additional interfaces implementation */

TInt CFatFormatCB::GetInterface(TInt aInterfaceId, TAny*& /*aInterface*/, TAny* aInput)

    {

    if(aInterfaceId == ESetFmtParameters)

        {

        return DoProcessTVolFormatParam((const TVolFormatParam_FAT*)aInput);

        }

    return KErrNotSupported;

    }

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

/** 

    Process formatting parameters passed as TVolFormatParam_FAT structure.

    @param      apVolFormatParam pointer to the formatting parameters.

    @return     standard error code

*/

TInt CFatFormatCB::DoProcessTVolFormatParam(const TVolFormatParam_FAT* apVolFormatParam)

    {

    if(apVolFormatParam->iUId != TVolFormatParam::KUId ||  apVolFormatParam->FSNameHash() != TVolFormatParam::CalcFSNameHash(KFileSystemName_FAT))

        {

        ASSERT(0);

        return KErrArgument;

        }

    //-- Populate iSpecialInfo with the data taken from apVolFormatParam.

    //-- for formatting FAT volume iSpecialInfo can hold absolutely all required data from apVolFormatParam.

    //-- if some additional data from apVolFormatParam are required for some reason, figure out youself how to store and use them.

    TLDFormatInfo& fmtInfo = iSpecialInfo();

    new(&fmtInfo) TLDFormatInfo; //-- initialise the structure in the buffer 

    //-- sectors per cluster

    fmtInfo.iSectorsPerCluster = (TUint16)apVolFormatParam->SectPerCluster();   

    //-- FAT type

    const TFatSubType fatSubType = apVolFormatParam->FatSubType();

    if(fatSubType != ENotSpecified && fatSubType != EFat12 && fatSubType != EFat16 && fatSubType != EFat32)

        return KErrArgument;

    fmtInfo.iFATBits = (TLDFormatInfo::TFATBits)fatSubType; //-- FAT12/16/32/not specified

    //-- number of FAT tables

    switch(apVolFormatParam->NumFATs())

        {

        case 0: //-- "not specified, default"

        break;

        case 1:

            fmtInfo.iFlags |= TLDFormatInfo::EOneFatTable; 

        break;

        case 2:

            fmtInfo.iFlags |= TLDFormatInfo::ETwoFatTables; 

        break;

        default: //-- more than KMaxFatTablesSupported is not supported

        return KErrArgument;

        };

    //-- number of reserved sectors

    fmtInfo.iReservedSectors = (TUint16)apVolFormatParam->ReservedSectors();

    return KErrNone;

    }