sl@0: // Copyright (c) 1998-2009 Nokia Corporation and/or its subsidiary(-ies).
sl@0: // All rights reserved.
sl@0: // This component and the accompanying materials are made available
sl@0: // under the terms of "Eclipse Public License v1.0"
sl@0: // which accompanies this distribution, and is available
sl@0: // at the URL "http://www.eclipse.org/legal/epl-v10.html".
sl@0: //
sl@0: // Initial Contributors:
sl@0: // Nokia Corporation - initial contribution.
sl@0: //
sl@0: // Contributors:
sl@0: //
sl@0: // Description:
sl@0: //
sl@0: 
sl@0: #include "UM_STD.H"
sl@0: 
sl@0: const TUint32 KFirstStreamIdValue=KNullStreamIdValue+1;
sl@0: const TInt KBufStoreGranularity=4;
sl@0: 
sl@0: EXPORT_C CBufStore* CBufStore::NewL(TInt anExpandSize)
sl@0: /** Allocates and constructs a new in-memory store and returns a pointer to it.
sl@0: 
sl@0: @param anExpandSize The granularity of the buffers used in the implementation 
sl@0: of the store. Each stream is contained in a separate CBufSeg buffer.
sl@0: @return A pointer to the memory store object. */
sl@0: 	{
sl@0: 	return new(ELeave) CBufStore(anExpandSize);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C CBufStore* CBufStore::NewLC(TInt anExpandSize)
sl@0: /** Allocates and constructs a new in-memory store and returns a pointer to it, 
sl@0: putting a pointer to the object onto the cleanup stack.
sl@0: 
sl@0: Putting a pointer to the object on the cleanup stack allows the object and 
sl@0: allocated resources to be cleaned up if a subsequent leave occurs.
sl@0: 
sl@0: @param anExpandSize The granularity of the buffers used in the implementation 
sl@0: of the store. Each stream is contained in a separate CBufSeg buffer.
sl@0: @return A pointer to the memory store object. */
sl@0: 	{
sl@0: 	CBufStore* store=NewL(anExpandSize);
sl@0: 	CleanupStack::PushL(store);
sl@0: 	return store;
sl@0: 	}
sl@0: 
sl@0: EXPORT_C CBufStore::CBufStore(TInt anExpandSize)
sl@0: //
sl@0: // Construct a buffer store.
sl@0: //
sl@0: 	: iBufArray(KBufStoreGranularity),iExpandSize(anExpandSize)
sl@0: 	{}
sl@0: 
sl@0: EXPORT_C CBufStore::~CBufStore()
sl@0: /** Frees resources owned by the object, prior to its destruction. */
sl@0: 	{
sl@0: 	for (TInt i=0,n=iBufArray.Count(); i<n; i++)
sl@0: 		delete iBufArray[i];
sl@0: 	}
sl@0: 
sl@0: EXPORT_C TStreamId CBufStore::DoExtendL()
sl@0: //
sl@0: // Create a new buffer slot.
sl@0: //
sl@0: 	{
sl@0: 	iBufArray.AppendL((CBufSeg*)NULL);
sl@0: 	return TStreamId(iBufArray.Count()-1+KFirstStreamIdValue);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C void CBufStore::DoDeleteL(TStreamId anId)
sl@0: //
sl@0: // Delete the buffer at anId.
sl@0: //
sl@0: 	{
sl@0: 	TInt i=anId.Value()-KFirstStreamIdValue;
sl@0: 	if (i<0||i>=iBufArray.Count())
sl@0: 		__LEAVE(KErrNotFound);
sl@0: //
sl@0: 	CBufSeg*& buf=iBufArray[i];
sl@0: 	delete buf;
sl@0: 	buf=NULL;
sl@0: 	}
sl@0: 
sl@0: EXPORT_C MStreamBuf* CBufStore::DoReadL(TStreamId anId) const
sl@0: //
sl@0: // Open a stream for reading from the buffer at anId.
sl@0: //
sl@0: 	{
sl@0: 	return HBufBuf::NewL(BufL(anId),0,HBufBuf::ERead);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C MStreamBuf* CBufStore::DoCreateL(TStreamId& anId)
sl@0: //
sl@0: // Create a new buffer and open a stream for writing to it.
sl@0: //
sl@0: 	{
sl@0: 	anId=DoExtendL();
sl@0: 	return HBufBuf::NewL(BufL(anId),0,HBufBuf::ERead|HBufBuf::EWrite);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C MStreamBuf* CBufStore::DoWriteL(TStreamId anId)
sl@0: //
sl@0: // Open a stream for writing to the buffer at anId.
sl@0: //
sl@0: 	{
sl@0: 	return HBufBuf::NewL(BufL(anId),0,HBufBuf::ERead|HBufBuf::EWrite);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C MStreamBuf* CBufStore::DoReplaceL(TStreamId anId)
sl@0: //
sl@0: // Open a truncating stream for writing to the buffer at anId.
sl@0: //
sl@0: 	{
sl@0: 	return HBufBuf::NewL(BufL(anId),0,HBufBuf::ERead|HBufBuf::ETruncate);
sl@0: 	}
sl@0: 
sl@0: CBufSeg& CBufStore::BufL(TStreamId anId) const
sl@0: //
sl@0: // Return this buffer store's buffer at anId.
sl@0: //
sl@0: 	{
sl@0: 	TInt i=anId.Value()-KFirstStreamIdValue;
sl@0: 	if (i<0||i>=iBufArray.Count())
sl@0: 		__LEAVE(KErrNotFound);
sl@0: //
sl@0: 	CBufSeg*& buf=CONST_CAST(CArrayFixFlat<CBufSeg*>&,iBufArray)[i];
sl@0: 	if (buf==NULL)
sl@0: 		buf=CBufSeg::NewL(iExpandSize);
sl@0: 	return *buf;
sl@0: 	}
sl@0: