/*+
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* Copyright (c) 1998-2009 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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* This file contains the implementation of the ASN1 integer class.+
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* As noted in Notes.txt there are two approaches to the storage of data by+
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* this class, it can either hold a copy of the data or a pointer to something+
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* else which holds a copy of the data.+
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* The object contained within this file encapsulates the ASN1 integer object+
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* as described in X208 section 14 and the encoding described in X209 section+
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* 8. +
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*+
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*/+
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+
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+
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#include "asn1dec.h"+
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#include <bigint.h>+
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+
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EXPORT_C TASN1DecInteger::TASN1DecInteger()+
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+
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	{+
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	}+
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+
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EXPORT_C TInt TASN1DecInteger::DecodeDERShortL(const TDesC8& aSource,TInt& aPos)+
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	{+
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	TPtrC8 Source=aSource.Mid(aPos);+
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	TASN1DecGeneric gen(Source);+
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	gen.InitL();+
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	TInt res = DecodeDERShortL(gen);+
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	aPos+=gen.LengthDER();+
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	return res;+
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	}+
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+
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EXPORT_C TInt TASN1DecInteger::DecodeDERShortL(const TASN1DecGeneric& aSource)+
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	{+
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	TInt res = 0;+
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	TPtrC8 ptr(aSource.GetContentDER());+
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	//stop stupid compiler warning+
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	TUint length = (TUint)(ptr.Length());+
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	if (length == 0) // DEF055722 +
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		{+
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		User::Leave(KErrArgument);+
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		}+
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	if (length > sizeof(TInt))+
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		{+
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		User::Leave(KErrTooBig);+
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		}+
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	TInt8 i;+
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	if (ptr[0]&128)+
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		{+
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		res = -1;+
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		}+
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	for (i=0;i<ptr.Length();i++)+
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		{+
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		res<<=8;+
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		res+=ptr[i];+
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		}+
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	return res;+
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	}+
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+
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EXPORT_C RInteger TASN1DecInteger::DecodeDERLongL(const TDesC8& aSource,TInt& aPos)+
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	{+
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	TPtrC8 Source=aSource.Right(aSource.Length() - aPos);+
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	TASN1DecGeneric gen(Source);+
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	gen.InitL();+
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	RInteger res = DecodeDERLongL(gen);+
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	aPos+=gen.LengthDER();+
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	return res;+
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	}+
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+
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EXPORT_C RInteger TASN1DecInteger::DecodeDERLongL(const TASN1DecGeneric& aSource)+
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	{+
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	const TDesC8& data = aSource.GetContentDER();+
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//	JCS 14/03/2003: Changed call to NewL from NewSignedL() because current+
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//	problem in RInteger for signed code means this sometimes returns incorrect+
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//	results causing failure in certstore testcode.  However, making this change+
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//	does cause problems in TASN1 now (posted defect DEF021796).+
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	RInteger res = RInteger::NewL(data);//aSource.GetContentDER());+
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	return (res);+
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	}+
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