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/*
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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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#include "asn1dec.h"
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#include <bigint.h>
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EXPORT_C TASN1DecInteger::TASN1DecInteger()
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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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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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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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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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