/*

* Copyright (c) 2002 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:  Bit reader utility

*

*/

// INCLUDE FILES

#include "nsmldmbitreader.h"

// ---------------------------------------------------------

// TNSmlDMBitreader::TNSmlDMBitreader()

// Constructor

// ---------------------------------------------------------

TNSmlDMBitreader::TNSmlDMBitreader( const TDesC8& aData ) : RDesReadStream(aData), iByte(0), iBits(0)

	{

	}

// ---------------------------------------------------------

// TNSmlDMBitreader::ReadUintL()

// 

// ---------------------------------------------------------

TUint32 TNSmlDMBitreader::ReadUintL( TInt aBitcount )

	{

	if( (aBitcount < 0) || (aBitcount > 32) )

		{

		User::Leave(KErrOverflow);

		}

	TUint32 value(0);

	while( aBitcount-- )

		{

		value <<= 1;

		value |= FetchNextBitL();

		}

	return value;

	}

// ---------------------------------------------------------

// TNSmlDMBitreader::ReadL()

// 

// ---------------------------------------------------------

void TNSmlDMBitreader::ReadL( TInt aBitcount, TDes8& aBuffer )

	{

	if( (aBitcount>>3) > aBuffer.MaxLength() )

		{

		User::Leave(KErrOverflow);

		}

	aBuffer.Zero();

	for( TInt i = 0; i < (aBitcount>>3); i++ )

		{

		aBuffer.Append((TUint8)ReadUintL(8));

		}

	}

// ---------------------------------------------------------

// TNSmlDMBitreader::FetchNextBitL()

// 

// ---------------------------------------------------------

TUint32 TNSmlDMBitreader::FetchNextBitL()

	{

	if( --iBits < 0 )

		{

		iByte = ReadUint8L();

		iBits = 7;

		}

	return (iByte>>iBits)&0x1;

	}

//  End of File