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: * Methods for encoding object identifiers
sl@0: *
sl@0: */
sl@0: 
sl@0: 
sl@0: #include "base128enc.h"
sl@0: #include "panic.h"
sl@0: 
sl@0: #include <asn1enc.h>
sl@0: 
sl@0: const TInt KArrayGranularity = 5;
sl@0: 
sl@0: const TUint KSecondTermBigLimit = 175;
sl@0: const TUint KFirstTermMultiplier = 40;
sl@0: const TUint KFirstTermMax = 2;
sl@0: 
sl@0: 
sl@0: EXPORT_C CASN1EncObjectIdentifier* CASN1EncObjectIdentifier::NewLC(const TDesC& aStr)
sl@0: 	{
sl@0: 	CASN1EncObjectIdentifier* self = new (ELeave) CASN1EncObjectIdentifier();
sl@0: 	CleanupStack::PushL(self);
sl@0: 	self->ConstructL(aStr);
sl@0: 	return self;
sl@0: 	}
sl@0: 
sl@0: EXPORT_C CASN1EncObjectIdentifier* CASN1EncObjectIdentifier::NewL(const TDesC& aStr)
sl@0: 	{
sl@0: 	CASN1EncObjectIdentifier* self = NewLC(aStr);
sl@0: 	CleanupStack::Pop(self);
sl@0: 	return self;
sl@0: 	}
sl@0: 
sl@0: EXPORT_C CASN1EncObjectIdentifier::~CASN1EncObjectIdentifier()
sl@0: 	{
sl@0: 	iData.Close();
sl@0: 	}
sl@0: 
sl@0: 
sl@0: CASN1EncObjectIdentifier::CASN1EncObjectIdentifier()
sl@0: : CASN1EncPrimitive(EASN1ObjectIdentifier), iData(KArrayGranularity)
sl@0: 	{
sl@0: 	}
sl@0: 
sl@0: 
sl@0: // Takes ints in a string, delimited by '.' characters in between (not at ends)
sl@0: void CASN1EncObjectIdentifier::ConstructL(const TDesC& aStr)
sl@0: 	{
sl@0: 	iData.Reset();
sl@0: 	TInt index = 0;
sl@0: 	TLex lex(aStr);
sl@0: 
sl@0: 	// First term
sl@0: 	__ASSERT_ALWAYS(!lex.Eos(), User::Leave(KErrBadDescriptor));
sl@0: 	TUint first;
sl@0: 	User::LeaveIfError(lex.Val(first));
sl@0: 	__ASSERT_ALWAYS(first <= KFirstTermMax, User::Leave(KErrBadDescriptor));
sl@0: 	// Static cast takes 8 least sig bits
sl@0: 	iFirstOctet = STATIC_CAST(TUint8, KFirstTermMultiplier * first);
sl@0: 
sl@0: 	// A '.' to delimit
sl@0: 	__ASSERT_ALWAYS(!lex.Eos() && lex.Get() == '.',	User::Leave(KErrBadDescriptor));
sl@0: 
sl@0: 	// Second term
sl@0: 	__ASSERT_ALWAYS(!lex.Eos(), User::Leave(KErrBadDescriptor));
sl@0: 	TUint second;
sl@0: 	User::LeaveIfError(lex.Val(second));
sl@0: 	__ASSERT_ALWAYS((first < KFirstTermMax && second < KFirstTermMultiplier)
sl@0: 		|| (first == KFirstTermMax && second <= KSecondTermBigLimit),
sl@0: 		User::Leave(KErrBadDescriptor));
sl@0: 	// Static cast takes 8 least sig bits
sl@0: 	iFirstOctet = STATIC_CAST(TUint8, iFirstOctet + second);
sl@0: 
sl@0: 	// Remaining terms
sl@0: 	while (!lex.Eos())
sl@0: 		{
sl@0: 		// Delimiter, and check we're not at end after that
sl@0: 		__ASSERT_ALWAYS(lex.Get() == '.' && !lex.Eos(),	User::Leave(KErrBadDescriptor));
sl@0: 
sl@0: 		TUint value;
sl@0: 		User::LeaveIfError(lex.Val(value));
sl@0: 		++index;
sl@0: 
sl@0: 		// Store the data away for later
sl@0: 		TASN1EncBase128DER encoder(value);
sl@0: 		User::LeaveIfError(iData.Append(encoder));
sl@0: 		}
sl@0: 
sl@0: 	// Remainder of ConstructL is here - safe to call CalculateContentsLengthDER now.
sl@0: 	CASN1EncPrimitive::ConstructL();
sl@0: 	}
sl@0: 
sl@0: 
sl@0: void CASN1EncObjectIdentifier::CalculateContentsLengthDER()
sl@0: 	{
sl@0: 	iContentsLengthDER = 1;
sl@0: 	for (TInt i = iData.Count() - 1; i >= 0; --i)
sl@0: 		{
sl@0: 		iContentsLengthDER += iData[i].LengthDER();
sl@0: 		}
sl@0: 	}
sl@0: 
sl@0: 
sl@0: void CASN1EncObjectIdentifier::WriteContentsDERL(TDes8& aBuf) const
sl@0: 	{
sl@0: 	aBuf[0] = iFirstOctet;
sl@0: 	TUint cursor = 1;
sl@0: 	TInt count = iData.Count();
sl@0: 	for (TInt i = 0; i < count; ++i)
sl@0: 		{
sl@0: 		iData[i].WriteDERL(aBuf, cursor);
sl@0: 		}
sl@0: 	}