/*

 * Copyright (c) 2001-2009 Nokia Corporation and/or its subsidiary(-ies).

 * All rights reserved.

 * This component and the accompanying materials are made available

 * under the terms of the License "Eclipse Public License v1.0"

 * which accompanies this distribution, and is available

 * at the URL "http://www.eclipse.org/legal/epl-v10.html".

 *

 * Initial Contributors:

 * Nokia Corporation - initial contribution.

 *

 * Contributors:

 *

 * Description: 

 * Methods for encoding object identifiers

 *

 */

 #include "base128enc.h"

 #include "panic.h"

 #include <asn1enc.h>

 const TInt KArrayGranularity = 5;

 const TUint KSecondTermBigLimit = 175;

 const TUint KFirstTermMultiplier = 40;

 const TUint KFirstTermMax = 2;

 EXPORT_C CASN1EncObjectIdentifier* CASN1EncObjectIdentifier::NewLC(const TDesC& aStr)

 	{

 	CASN1EncObjectIdentifier* self = new (ELeave) CASN1EncObjectIdentifier();

 	CleanupStack::PushL(self);

 	self->ConstructL(aStr);

 	return self;

 	}

 EXPORT_C CASN1EncObjectIdentifier* CASN1EncObjectIdentifier::NewL(const TDesC& aStr)

 	{

 	CASN1EncObjectIdentifier* self = NewLC(aStr);

 	CleanupStack::Pop(self);

 	return self;

 	}

 EXPORT_C CASN1EncObjectIdentifier::~CASN1EncObjectIdentifier()

 	{

 	iData.Close();

 	}

 CASN1EncObjectIdentifier::CASN1EncObjectIdentifier()

 : CASN1EncPrimitive(EASN1ObjectIdentifier), iData(KArrayGranularity)

 	{

 	}

 // Takes ints in a string, delimited by '.' characters in between (not at ends)

 void CASN1EncObjectIdentifier::ConstructL(const TDesC& aStr)

 	{

 	iData.Reset();

 	TInt index = 0;

 	TLex lex(aStr);

 	// First term

 	__ASSERT_ALWAYS(!lex.Eos(), User::Leave(KErrBadDescriptor));

 	TUint first;

 	User::LeaveIfError(lex.Val(first));

 	__ASSERT_ALWAYS(first <= KFirstTermMax, User::Leave(KErrBadDescriptor));

 	// Static cast takes 8 least sig bits

 	iFirstOctet = STATIC_CAST(TUint8, KFirstTermMultiplier * first);

 	// A '.' to delimit

 	__ASSERT_ALWAYS(!lex.Eos() && lex.Get() == '.',	User::Leave(KErrBadDescriptor));

 	// Second term

 	__ASSERT_ALWAYS(!lex.Eos(), User::Leave(KErrBadDescriptor));

 	TUint second;

 	User::LeaveIfError(lex.Val(second));

 	__ASSERT_ALWAYS((first < KFirstTermMax && second < KFirstTermMultiplier)

 		|| (first == KFirstTermMax && second <= KSecondTermBigLimit),

 		User::Leave(KErrBadDescriptor));

 	// Static cast takes 8 least sig bits

 	iFirstOctet = STATIC_CAST(TUint8, iFirstOctet + second);

 	// Remaining terms

 	while (!lex.Eos())

 		{

 		// Delimiter, and check we're not at end after that

 		__ASSERT_ALWAYS(lex.Get() == '.' && !lex.Eos(),	User::Leave(KErrBadDescriptor));

 		TUint value;

 		User::LeaveIfError(lex.Val(value));

 		++index;

 		// Store the data away for later

 		TASN1EncBase128DER encoder(value);

 		User::LeaveIfError(iData.Append(encoder));

 		}

 	// Remainder of ConstructL is here - safe to call CalculateContentsLengthDER now.

 	CASN1EncPrimitive::ConstructL();

 	}

 void CASN1EncObjectIdentifier::CalculateContentsLengthDER()

 	{

 	iContentsLengthDER = 1;

 	for (TInt i = iData.Count() - 1; i >= 0; --i)

 		{

 		iContentsLengthDER += iData[i].LengthDER();

 		}

 	}

 void CASN1EncObjectIdentifier::WriteContentsDERL(TDes8& aBuf) const

 	{

 	aBuf[0] = iFirstOctet;

 	TUint cursor = 1;

 	TInt count = iData.Count();

 	for (TInt i = 0; i < count; ++i)

 		{

 		iData[i].WriteDERL(aBuf, cursor);

 		}

 	}