// Copyright (c) 1998-2009 Nokia Corporation and/or its subsidiary(-ies).

// All rights reserved.

// This component and the accompanying materials are made available

// under the terms of "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 "UT_STD.H"

// Class CDbTableCursor::HWriteBuf

inline CDbTableCursor::HWriteBuf::HWriteBuf(CDbTableCursor& aCursor,const TDbColumn& aColumn,TDbColType aType)

	: iCursor(aCursor),iColumn(aColumn),iType(aType),iBlob(0),iInlineBuf(0,0),iSize(0),iOverflowBuf(0)

	{aCursor.AddSink();}

void CDbTableCursor::HWriteBuf::ConstructL()

	{

	iBlob=&iColumn.InitBlobL();

	iInlineBuf.Set(iBlob->InlineBuffer(),0,iCursor.BlobsL().InlineLimit());

	Set(iInlineBuf);

	}

CDbTableCursor::HWriteBuf* CDbTableCursor::HWriteBuf::NewL(CDbTableCursor& aCursor,const TDbColumn& aColumn,TDbColType aType)

	{

	__ASSERT(TDbCol::IsLong(aType));

//

	HWriteBuf* self=new(ELeave) HWriteBuf(aCursor,aColumn,aType);

	self->PushL();

	self->ConstructL();

	CleanupStack::Pop();

	return self;

	}

inline CDbTableCursor::HWriteBuf::~HWriteBuf()

	{

	if (iOverflowBuf)

		iOverflowBuf->Release();

	if (iBlob)

		iColumn.CommitBlob(*iBlob);

	iCursor.ReleaseSink();

	}

void CDbTableCursor::HWriteBuf::DoRelease()

	{

	delete this;

	}

inline TBool CDbTableCursor::HWriteBuf::IsBinary() const

	{return iType==EDbColLongBinary;}

#pragma warning(disable : 4701)			// disable not initialised before use warning.  

void CDbTableCursor::HWriteBuf::FlipL()

//

// switch from inline to out of line stream

//

	{

	__ASSERT( !iOverflowBuf );

//

	TStreamPos rpos(0);

	if ( IsBinary() )	// seeking only allowed for binary (non-encrypted) data

		rpos = TDesBuf::TellL( ERead );

	iOverflowBuf = iCursor.BlobsL().CreateL( iBlobId, iType );

	const TUint8* base = iInlineBuf.Ptr();

	TInt len = Ptr( EWrite ) - base;

	if ( len )

		iOverflowBuf->WriteL( base, len );

	if ( IsBinary() )	// seeking only allowed for binary (non-encrypted) data

		iOverflowBuf->SeekL( ERead, rpos );

	}

#pragma warning(default : 4701)			// enable not initialised before use warning.  

void CDbTableCursor::HWriteBuf::DoSynchL()

//

// update the row buffer for the blob

//

	{

	MStreamBuf* buf=iOverflowBuf!=NULL ? iOverflowBuf : this;

	TInt size=IsBinary() ? buf->SizeL() : iSize;

	if (iOverflowBuf!=NULL)

		{

		buf->SynchL();

		iBlob->SetId(iBlobId);

		}

	iBlob->SetSize(size);

	}

TInt CDbTableCursor::HWriteBuf::DoReadL(TAny* aPtr,TInt aMaxLength)

	{

	__ASSERT(IsBinary());

//

	if (iOverflowBuf!=NULL)

		return iOverflowBuf->ReadL(aPtr,aMaxLength);

	return TDesBuf::DoReadL(aPtr,aMaxLength);

	}

TStreamTransfer CDbTableCursor::HWriteBuf::DoReadL(MStreamInput& aInput,TStreamTransfer aTransfer)

	{

	__ASSERT(IsBinary());

//

	if (iOverflowBuf!=NULL)

		return iOverflowBuf->ReadL(aInput,aTransfer);

	return TDesBuf::DoReadL(aInput,aTransfer);

	}

void CDbTableCursor::HWriteBuf::DoWriteL(const TAny* aPtr,TInt aLength)

	{

	if (iOverflowBuf==NULL)

		{

		if (aLength<=Avail(EWrite))

			{

			TDesBuf::DoWriteL(aPtr,aLength);

			iSize+=aLength;

			return;

			}

		FlipL();

		}

	iOverflowBuf->WriteL(aPtr,aLength);

	iSize+=aLength;

	}

TStreamTransfer CDbTableCursor::HWriteBuf::DoWriteL(MStreamOutput& aOutput,TStreamTransfer aTransfer)

	{

	TInt size=iSize;

	TStreamTransfer t1=aTransfer[KMaxTInt];

	TStreamTransfer t2=iOverflowBuf ? iOverflowBuf->WriteL(aOutput,t1) : TDesBuf::DoWriteL(aOutput,t1);

	TInt bytes=t1.Left()-t2.Left();

	iSize=size+bytes;

	return aTransfer-bytes;

	}

TStreamPos CDbTableCursor::HWriteBuf::DoSeekL(TMark aMark,TStreamLocation aLocation,TInt aOffset)

	{

	__ASSERT(IsBinary());

//

	if (iOverflowBuf!=NULL)

		return iOverflowBuf->SeekL(aMark,aLocation,aOffset);

	return TDesBuf::DoSeekL(aMark,aLocation,aOffset);

	}

// Class CDbTableCursor::HMemBuf

CDbTableCursor::HMemBuf::HMemBuf(CDbTableCursor& aCursor)

	:iCursor(aCursor)

	{

	aCursor.AddSource();

	}

CDbTableCursor::HMemBuf* CDbTableCursor::HMemBuf::NewL(CDbTableCursor& aCursor,const TDesC8& aDes)

	{

	HMemBuf* self=new(ELeave) HMemBuf(aCursor);

	TUint8* ptr=const_cast<TUint8*>(aDes.Ptr());

	self->Set(ptr,ptr+aDes.Length(),ERead);

	return self;

	}

inline CDbTableCursor::HMemBuf::~HMemBuf()

	{iCursor.ReleaseSource();}

void CDbTableCursor::HMemBuf::DoRelease()

	{	

	delete this;

	}

// Class CDbTableCursor::HHeapBuf

inline CDbTableCursor::HHeapBuf::HHeapBuf( CDbTableCursor& aCursor )

	:HMemBuf( aCursor )

	{}

CDbTableCursor::HHeapBuf* CDbTableCursor::HHeapBuf::NewL( CDbTableCursor& aCursor, const TDbBlob& aBlob, TDbColType aType )

	{

	__ASSERT( aBlob.Size() <= EMaxBlobBuffer );

	HHeapBuf* self = new( mem ) HHeapBuf(aCursor);	// do an in place new, now we've got the memory

	self->PushL();

	MStreamBuf* buf = aCursor.BlobsL().ReadLC( aBlob.Id(), aType );

	__DEBUG( TInt sz = ) buf->ReadL( &self->iBuf[0], aBlob.Size() );

	__ASSERT(sz == aBlob.Size());

	CleanupStack::PopAndDestroy();	// buf

	self->Set( &self->iBuf[0], &self->iBuf[aBlob.Size() ], ERead );

	CleanupStack::Pop();			// self

	return self;

	}

// Class CDbTableCursor::HReadBuf

inline CDbTableCursor::HReadBuf::HReadBuf(CDbTableCursor& aCursor)

	:iCursor(aCursor),iHost(0)

	{aCursor.AddBlobSource();}

CDbTableCursor::HReadBuf* CDbTableCursor::HReadBuf::NewLC(CDbTableCursor& aCursor)

	{

	HReadBuf* self=new(ELeave) HReadBuf(aCursor);

	self->PushL();

	return self;

	}

inline CDbTableCursor::HReadBuf::~HReadBuf()

	{

	if (iHost)

		iHost->Release();

	iCursor.ReleaseBlobSource();

	}

void CDbTableCursor::HReadBuf::DoRelease()

	{

	delete this;

	}

TInt CDbTableCursor::HReadBuf::DoReadL(TAny* aPtr,TInt aMaxLength)

	{

	__ASSERT(iHost);

	return iHost->ReadL(aPtr,aMaxLength);

	}

TStreamTransfer CDbTableCursor::HReadBuf::DoReadL(MStreamInput& aInput,TStreamTransfer aTransfer)

	{

	__ASSERT(iHost);

	return iHost->ReadL(aInput,aTransfer);

	}

TStreamPos CDbTableCursor::HReadBuf::DoSeekL(TMark aMark,TStreamLocation aLocation,TInt aOffset)

	{

	__ASSERT(iHost);

	return iHost->SeekL(aMark,aLocation,aOffset);

	}