sl@0: /*
sl@0: * Copyright (c) 2001-2009 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 the License "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: * Implementation for class encoding TInt in ASN1 DER
sl@0: *
sl@0: */
sl@0: 
sl@0: 
sl@0: #include <asn1enc.h>
sl@0: 
sl@0: EXPORT_C CASN1EncInt* CASN1EncInt::NewLC(const TInt aInt)
sl@0: 	{
sl@0: 	CASN1EncInt* self = new (ELeave) CASN1EncInt(aInt);
sl@0: 	CleanupStack::PushL(self);
sl@0: 	self->ConstructL();
sl@0: 	return self;
sl@0: 	}
sl@0: 
sl@0: EXPORT_C CASN1EncInt* CASN1EncInt::NewL(const TInt aInt)
sl@0: 	{
sl@0: 	CASN1EncInt* self = NewLC(aInt);
sl@0: 	CleanupStack::Pop(self);
sl@0: 	return self;
sl@0: 	}
sl@0: 
sl@0: CASN1EncInt::CASN1EncInt(const TInt aInt)
sl@0: : CASN1EncPrimitive(EASN1Integer), iInt(aInt)
sl@0: 	{
sl@0: 	}
sl@0: 
sl@0: void CASN1EncInt::CalculateContentsLengthDER()
sl@0: 	{
sl@0: 	iContentsLengthDER = 1;
sl@0: 
sl@0: 	// Flip bits in -ve numbers
sl@0: 	TUint working = iInt < 0 ? ~iInt : iInt;
sl@0: 	TUint last = working;
sl@0: 	while (working >>= 8)
sl@0: 		{
sl@0: 		last = working;
sl@0: 		++iContentsLengthDER;
sl@0: 		}
sl@0: 	
sl@0: 	// If most sig non-zero byte had a 1 top bit, we'll need the next byte too
sl@0: 	// (applies to both +ve and -ve cases)
sl@0: 	if (last & 0x80)
sl@0: 		{
sl@0: 		++iContentsLengthDER;
sl@0: 		}
sl@0: 	}
sl@0: 
sl@0: 
sl@0: void CASN1EncInt::WriteContentsDERL(TDes8& aBuf) const
sl@0: 	{
sl@0: 	// Unsigned, so operator>>= works sensibly
sl@0: 	TUint working = iInt;
sl@0: 	TUint position = iContentsLengthDER;
sl@0: 	while (position)
sl@0: 		{
sl@0: 		// Cast takes least sig 8 bits
sl@0: 		aBuf[--position] = STATIC_CAST(TUint8, working);
sl@0: 		working >>= 8;
sl@0: 		}
sl@0: 	}