/*+
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* Copyright (c) 2001-2009 Nokia Corporation and/or its subsidiary(-ies).+
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* All rights reserved.+
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* This component and the accompanying materials are made available+
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* under the terms of the License "Eclipse Public License v1.0"+
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* which accompanies this distribution, and is available+
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".+
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*+
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* Initial Contributors:+
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* Nokia Corporation - initial contribution.+
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*+
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* Contributors:+
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*+
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* Description: +
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* Implementation for TASN1EncBase128 class.+
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*+
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*/+
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+
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+
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#include "base128enc.h"+
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+
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+
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TASN1EncBase128DER::TASN1EncBase128DER(TUint aInt) : iInt(aInt), iLengthDER(0)+
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	{+
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	CalculateLengthDER();+
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	}+
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+
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+
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TUint TASN1EncBase128DER::LengthDER() const+
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	{+
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	return iLengthDER;+
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	}+
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+
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+
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void TASN1EncBase128DER::CalculateLengthDER()+
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	{+
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	iLengthDER = 1;+
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	TUint working = iInt;+
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	while (working >>= 7)+
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		{+
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		++iLengthDER;+
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		}+
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	}+
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+
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+
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void TASN1EncBase128DER::WriteDERL(TDes8& aBuf, TUint& aPos) const+
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	{+
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	__ASSERT_DEBUG(aBuf.Length() - aPos >= STATIC_CAST(TUint8, iLengthDER), +
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		User::Leave(KErrBadDescriptor));+
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+
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	TInt last = aPos + iLengthDER - 1;+
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	TUint working = iInt;+
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	for (TUint cursor = last; cursor >= aPos; --cursor)+
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		{+
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		// Cast takes least significant 8 bits only (actually, we only need 7)+
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		aBuf[cursor] = STATIC_CAST(TUint8, working);+
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		aBuf[cursor] |= 0x80; // Top bit always set to 1...+
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		working >>= 7;+
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		}+
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	// ...except top bit on last byte is 0+
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	aBuf[last] &= 0x7F;+
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+
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	aPos += iLengthDER;+
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	}+
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