/*

* Copyright (c) 2001-2009 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the License "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: 

* Implementation for class encoding TInt in ASN1 DER

*

*/

#include <asn1enc.h>

EXPORT_C CASN1EncInt* CASN1EncInt::NewLC(const TInt aInt)

	{

	CASN1EncInt* self = new (ELeave) CASN1EncInt(aInt);

	CleanupStack::PushL(self);

	self->ConstructL();

	return self;

	}

EXPORT_C CASN1EncInt* CASN1EncInt::NewL(const TInt aInt)

	{

	CASN1EncInt* self = NewLC(aInt);

	CleanupStack::Pop(self);

	return self;

	}

CASN1EncInt::CASN1EncInt(const TInt aInt)

: CASN1EncPrimitive(EASN1Integer), iInt(aInt)

	{

	}

void CASN1EncInt::CalculateContentsLengthDER()

	{

	iContentsLengthDER = 1;

	// Flip bits in -ve numbers

	TUint working = iInt < 0 ? ~iInt : iInt;

	TUint last = working;

	while (working >>= 8)

		{

		last = working;

		++iContentsLengthDER;

		}

	// If most sig non-zero byte had a 1 top bit, we'll need the next byte too

	// (applies to both +ve and -ve cases)

	if (last & 0x80)

		{

		++iContentsLengthDER;

		}

	}

void CASN1EncInt::WriteContentsDERL(TDes8& aBuf) const

	{

	// Unsigned, so operator>>= works sensibly

	TUint working = iInt;

	TUint position = iContentsLengthDER;

	while (position)

		{

		// Cast takes least sig 8 bits

		aBuf[--position] = STATIC_CAST(TUint8, working);

		working >>= 8;

		}

	}