// Copyright (c) 2003-2009 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:

// Implements the avdtp allocators

// 

//

/**

 @file

 @internalComponent

*/

#include "avdtpAllocators.h"

TInt TBitFieldAllocator::Get(TInt& aValue, TInt aMax, TInt aMin/*=0*/)

	{

	if (aMax<aMin)

		{

		return KErrArgument;

		}

	if ((aMax-aMin)>((8*sizeof(iBitField))-1))

		{

		// this class supports 64 values/bits at present

		return KErrTooBig;

		}

	// bit 1 represents the use of val=min,bit 2 use of val=min+1, etc

	for (TInt bit=0;bit<=(aMax-aMin);bit++)

		{

		if (!(iBitField & (1<<bit)))

			{

			iMin = aMin;

			// it's free, mark it

			iBitField |= (1<<bit);

			aValue = bit+iMin;

			return KErrNone;

			}

		}	

	return KErrInUse;

	}

void TBitFieldAllocator::Free(TInt aValue)

	{

	TInt bitPos = aValue-iMin;

#ifdef _DEBUG

	if (!(iBitField & (1<<bitPos)))

		{

		// freeing an unclaimed bit - maybe due to a leave, but allow checking

		__DEBUGGER();

		}

#endif

	//Clear the bit in iSpace corresponding to aBitPos

	iBitField &= (~(1<<bitPos));	

	}