// 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:

//

#include "sl_std.h"

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

TTime DosTimeToTTime(TInt aDosTime,TInt aDosDate)

//

//	Deciphers the dos time/date entry information and converts to TTime

//

	{

	TInt secMask=0x1F;

	TInt minMask=0x07E0;

	TInt hrMask=0xF800;

	TInt dayMask=0x1F;

	TInt monthMask=0x01E0;

	TInt yearMask=0xFE00;

	TInt secs=(aDosTime&secMask)*2;

	TInt mins=(aDosTime&minMask)>>5;

	TInt hrs=(aDosTime&hrMask)>>11;

	TInt days=(aDosDate&dayMask)-1;

	TMonth months=(TMonth)(((aDosDate&monthMask)>>5)-1);

	TInt years=((aDosDate&yearMask)>>9)+1980;

	TDateTime datetime;

	TInt ret=datetime.Set(years,months,days,hrs,mins,secs,0);

	if (ret==KErrNone)

		return(TTime(datetime));

	return(TTime(0));

	}

TInt DosTimeFromTTime(const TTime& aTime)

//

// Converts a TTime to a dos time

//

	{

	TDateTime dateTime=aTime.DateTime();

	TInt dosSecs=dateTime.Second()/2;

	TInt dosMins=dateTime.Minute()<<5;

	TInt dosHrs=dateTime.Hour()<<11;

	return dosSecs|dosMins|dosHrs;

	}

TInt DosDateFromTTime(const TTime& aTime)

//

// Converts a TTime to a dos date

//

	{

	TDateTime dateTime=aTime.DateTime();

	TInt dosDays=dateTime.Day()+1;

	TInt dosMonths=(dateTime.Month()+1)<<5;

	TInt dosYears=(dateTime.Year()-1980)<<9;

	return dosDays|dosMonths|dosYears;

	}

TBuf8<12> DosNameToStdFormat(const TDesC8& aDosName)

//

// Converts xxx.yyy to standard format aaaaaaaayyy

//

	{

	__ASSERT_DEBUG(aDosName.Length()>=0 && aDosName.Length()<=12,Fault(EFatBadDosFormatName));

	TBuf8<12> result;

	Mem::Fill((TUint8*)result.Ptr(),result.MaxSize(),' ');

	TInt dotPos=aDosName.Locate('.');

	if (dotPos==KErrNotFound)

		{

		result=aDosName;

		result.SetLength(11);

		return result;

		}

	result=aDosName.Left(dotPos);

	result.SetLength(11);

	TPtr8 ext(&result[8],3);

	ext=aDosName.Right(aDosName.Length()-dotPos-1);

	return result;

	}

TBuf8<12> DosNameFromStdFormat(const TDesC8& aStdFormatName)

//

// Converts aaaaaaaayyy to dos name format xxx.yyy

//

	{

	__ASSERT_DEBUG(aStdFormatName.Length()==11,Fault(EFatBadStdFormatName));

	TBuf8<12> result;

	TInt nameLen=aStdFormatName.Locate(' ');

	if (nameLen>8 || nameLen==KErrNotFound)

		nameLen=8;

	result=aStdFormatName.Left(nameLen);

	TPtrC8 ext(&aStdFormatName[8],3);

	TInt extLen=ext.Locate(' ');

	if (extLen)

		result.Append(TChar('.'));

	if (extLen==KErrNotFound)

		extLen=3;

	result.Append(ext.Left(extLen));

    if(result.Length() && result[0]==0x05 )

	    {

	    result[0]=0xE5;

	    }

	return result;

	}

TInt NumberOfVFatEntries(TInt aNameLength)

//

// Return the number of VFat entries required to describe a filename of length aNameLength

//

	{

	TInt numberOfEntries=0;

	if (aNameLength%KMaxVFatEntryName)

		aNameLength++;	//	Include a zero terminator

//	If aNameLength is a exact multiple of KMaxVFatEntryName, don't bother

//	with a zero terminator - it just adds an unnecessary directory entry		

	numberOfEntries=(1+(aNameLength/KMaxVFatEntryName));	

	if (aNameLength%KMaxVFatEntryName)

		numberOfEntries++;

	return(numberOfEntries);

	}

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

/** 

    Calculate DOS short name checksum

    @param aShortName short name descriptor (must be at least 11 bytes long)

    @return checksum

*/

TUint8 CalculateShortNameCheckSum(const TDesC8& aShortName)

    {

    ASSERT(aShortName.Length() >= KFatDirNameSize);

    const TUint8* pName = aShortName.Ptr();

    const TUint32 w0 = ((const TUint32*)pName)[0];

    const TUint32 w1 = ((const TUint32*)pName)[1];

    TUint32 chkSum = w0 & 0xFF;

    chkSum = (TUint8)(((chkSum<<7) | (chkSum>>1)) + ((w0 << 16) >> 24));

    chkSum = (TUint8)(((chkSum<<7) | (chkSum>>1)) + ((w0 << 8)  >> 24));

    chkSum = (TUint8)(((chkSum<<7) | (chkSum>>1)) + ( w0 >> 24));

    chkSum = (TUint8)(((chkSum<<7) | (chkSum>>1)) + (w1) & 0xFF);

    chkSum = (TUint8)(((chkSum<<7) | (chkSum>>1)) + ((w1 << 16) >> 24));

    chkSum = (TUint8)(((chkSum<<7) | (chkSum>>1)) + ((w1 << 8)  >> 24));

    chkSum = (TUint8)(((chkSum<<7) | (chkSum>>1)) + ( w1 >> 24));

    chkSum = (TUint8)(((chkSum<<7) | (chkSum>>1)) + pName[8]);

    chkSum = (TUint8)(((chkSum<<7) | (chkSum>>1)) + pName[9]);

    chkSum = (TUint8)(((chkSum<<7) | (chkSum>>1)) + pName[10]);

    return (TUint8)chkSum;

    }