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