1 // Copyright (c) 2003-2009 Nokia Corporation and/or its subsidiary(-ies).

     2 // All rights reserved.

     3 // This component and the accompanying materials are made available

     4 // under the terms of "Eclipse Public License v1.0"

     5 // which accompanies this distribution, and is available

     6 // at the URL "http://www.eclipse.org/legal/epl-v10.html".

     7 //

     8 // Initial Contributors:

     9 // Nokia Corporation - initial contribution.

    10 //

    11 // Contributors:

    12 //

    13 // Description:

    14 // Implements the avdtp allocators

    15 // 

    16 //

    17 

    18 /**

    19  @file

    20  @internalComponent

    21 */

    22 

    23 #include "avdtpAllocators.h"

    24 

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

    26 	{

    27 	if (aMax<aMin)

    28 		{

    29 		return KErrArgument;

    30 		}

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

    32 		{

    33 		// this class supports 64 values/bits at present

    34 		return KErrTooBig;

    35 		}

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

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

    38 		{

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

    40 			{

    41 			iMin = aMin;

    42 			// it's free, mark it

    43 			iBitField |= (1<<bit);

    44 			aValue = bit+iMin;

    45 			return KErrNone;

    46 			}

    47 		}	

    48 	return KErrInUse;

    49 	}

    50 	

    51 

    52 void TBitFieldAllocator::Free(TInt aValue)

    53 	{

    54 	TInt bitPos = aValue-iMin;

    55 #ifdef _DEBUG

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

    57 		{

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

    59 		__DEBUGGER();

    60 		}

    61 #endif

    62 	//Clear the bit in iSpace corresponding to aBitPos

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

    64 	}

    65 

    66