// 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 "UM_STD.H"

const TUint32 KFirstStreamIdValue=KNullStreamIdValue+1;

const TInt KBufStoreGranularity=4;

EXPORT_C CBufStore* CBufStore::NewL(TInt anExpandSize)

/** Allocates and constructs a new in-memory store and returns a pointer to it.

@param anExpandSize The granularity of the buffers used in the implementation 

of the store. Each stream is contained in a separate CBufSeg buffer.

@return A pointer to the memory store object. */

	{

	return new(ELeave) CBufStore(anExpandSize);

	}

EXPORT_C CBufStore* CBufStore::NewLC(TInt anExpandSize)

/** Allocates and constructs a new in-memory store and returns a pointer to it, 

putting a pointer to the object onto the cleanup stack.

Putting a pointer to the object on the cleanup stack allows the object and 

allocated resources to be cleaned up if a subsequent leave occurs.

@param anExpandSize The granularity of the buffers used in the implementation 

of the store. Each stream is contained in a separate CBufSeg buffer.

@return A pointer to the memory store object. */

	{

	CBufStore* store=NewL(anExpandSize);

	CleanupStack::PushL(store);

	return store;

	}

EXPORT_C CBufStore::CBufStore(TInt anExpandSize)

//

// Construct a buffer store.

//

	: iBufArray(KBufStoreGranularity),iExpandSize(anExpandSize)

	{}

EXPORT_C CBufStore::~CBufStore()

/** Frees resources owned by the object, prior to its destruction. */

	{

	for (TInt i=0,n=iBufArray.Count(); i<n; i++)

		delete iBufArray[i];

	}

EXPORT_C TStreamId CBufStore::DoExtendL()

//

// Create a new buffer slot.

//

	{

	iBufArray.AppendL((CBufSeg*)NULL);

	return TStreamId(iBufArray.Count()-1+KFirstStreamIdValue);

	}

EXPORT_C void CBufStore::DoDeleteL(TStreamId anId)

//

// Delete the buffer at anId.

//

	{

	TInt i=anId.Value()-KFirstStreamIdValue;

	if (i<0||i>=iBufArray.Count())

		__LEAVE(KErrNotFound);

//

	CBufSeg*& buf=iBufArray[i];

	delete buf;

	buf=NULL;

	}

EXPORT_C MStreamBuf* CBufStore::DoReadL(TStreamId anId) const

//

// Open a stream for reading from the buffer at anId.

//

	{

	return HBufBuf::NewL(BufL(anId),0,HBufBuf::ERead);

	}

EXPORT_C MStreamBuf* CBufStore::DoCreateL(TStreamId& anId)

//

// Create a new buffer and open a stream for writing to it.

//

	{

	anId=DoExtendL();

	return HBufBuf::NewL(BufL(anId),0,HBufBuf::ERead|HBufBuf::EWrite);

	}

EXPORT_C MStreamBuf* CBufStore::DoWriteL(TStreamId anId)

//

// Open a stream for writing to the buffer at anId.

//

	{

	return HBufBuf::NewL(BufL(anId),0,HBufBuf::ERead|HBufBuf::EWrite);

	}

EXPORT_C MStreamBuf* CBufStore::DoReplaceL(TStreamId anId)

//

// Open a truncating stream for writing to the buffer at anId.

//

	{

	return HBufBuf::NewL(BufL(anId),0,HBufBuf::ERead|HBufBuf::ETruncate);

	}

CBufSeg& CBufStore::BufL(TStreamId anId) const

//

// Return this buffer store's buffer at anId.

//

	{

	TInt i=anId.Value()-KFirstStreamIdValue;

	if (i<0||i>=iBufArray.Count())

		__LEAVE(KErrNotFound);

//

	CBufSeg*& buf=CONST_CAST(CArrayFixFlat<CBufSeg*>&,iBufArray)[i];

	if (buf==NULL)

		buf=CBufSeg::NewL(iExpandSize);

	return *buf;

	}