sl@0: // Copyright (c) 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: #include "LogDynBuf.h"
sl@0: 
sl@0: /**
sl@0: Constructs RLogDynBuf object with the specified granularity.
sl@0: 
sl@0: @param aGranularity RLogDynBuf granularity. 
sl@0: @endcode
sl@0: 
sl@0: @leave KErrNoMemory Out of memory.
sl@0: */
sl@0: void RLogDynBuf::CreateLC(TInt aGranularity)
sl@0: 	{
sl@0: 	iGranularity = aGranularity;
sl@0: 	iBuf.CreateL(aGranularity);
sl@0: 	CleanupClosePushL(*this);
sl@0: 	}
sl@0: 
sl@0: /**
sl@0: Destroys the buffer
sl@0: */
sl@0: void RLogDynBuf::Close()
sl@0: 	{
sl@0: 	iBuf.Close();	
sl@0: 	}
sl@0: 
sl@0: /**
sl@0: Attempts to append aStr to the end of the buffer. If the buffer has not enough available space,
sl@0: AppendL() will try to expand the buffer before the append operation.
sl@0: 
sl@0: @param aStr 16-bit desrpiptor to be appended to the end of the buffer.
sl@0: 
sl@0: @leave KErrNoMemory Out of memory.
sl@0: */	
sl@0: void RLogDynBuf::AppendL(const TDesC& aStr)
sl@0: 	{
sl@0: 	DoAllocL(aStr.Length());
sl@0: 	iBuf.Append(aStr);
sl@0: 	}
sl@0: 
sl@0: /**
sl@0: If aLen is bigger than the available buffer space, the buffer will be expanded.
sl@0: 
sl@0: @param aLen The new size of the buffer, in bytes.  
sl@0: 
sl@0: @leave KErrNoMemory Out of memory.
sl@0: */
sl@0: void RLogDynBuf::DoAllocL(TInt aLen)
sl@0: 	{
sl@0: 	__ASSERT_DEBUG(aLen >= 0, User::Invariant());
sl@0: 	const TInt len = iBuf.Length();
sl@0: 	TInt maxLen = iBuf.MaxLength();
sl@0: 	TInt available = maxLen - len;
sl@0: 	TInt overflow = aLen - available;
sl@0: 	if(overflow > 0)
sl@0: 		{
sl@0: 		iBuf.ReAllocL(maxLen + (overflow / iGranularity + 1) * iGranularity);
sl@0: 		}
sl@0: 	}