/*

* 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);

		}

	}