/*

* Copyright (c) 1997-2009 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: 

*

*/

#include "wtlsdec.h"

//stolen from stdlib

#define WTLS_UNIX_BASE   TTime(MAKE_TINT64(0x00dcddb3,0x0f2f8000))    // 00:00, Jan 1st 1970

const TInt KTimeLength = 4;

TWTLSDecVector::TWTLSDecVector(const TDesC8& aSource, TInt aMinLength, TInt aMaxLength)

	:iEncoding(aSource), iMinLength(aMinLength), iMaxLength(aMaxLength), iLengthOfContents(0), iLengthOfLength(0)

	{

	}

void TWTLSDecVector::InitL()

	{

	if (iMaxLength <= 255)

		{

		iLengthOfLength = 1;

		}

	else

		{

		if (iMaxLength <= 65535)

			{

			iLengthOfLength = 2;

			}

		else

			{

			if (iMaxLength <= 16777215)

				{

				iLengthOfLength = 3;

				}

			else

				{

				iLengthOfLength = 4;

				}

			}

		}

	if (iEncoding.Length() < (iLengthOfLength + iMinLength))

		{

		User::Leave(KErrArgument);

		}

	TWTLSDecUnsignedInteger decLength;

	TInt pos = 0;

	iLengthOfContents = decLength.DecodeShortL(iEncoding, pos, iLengthOfLength);

	if (iEncoding.Length() < (iLengthOfLength + iLengthOfContents))

		{

		User::Leave(KErrArgument);

		}

	}

/*

TPtrC8 TWTLSDecVector::Encoding() const

	{

	return iEncoding.Left(EncodingLength());

	}

*/

TInt TWTLSDecVector::EncodingLength() const

	{

	return iLengthOfLength + iLengthOfContents;

	}

/*	

TPtrC8 TWTLSDecVector::Content() const

	{

	return iEncoding.Mid(iLengthOfLength, iLengthOfContents);

	}

TInt TWTLSDecVector::ContentLength() const

	{

	return iLengthOfContents;

	}

TInt TWTLSDecVector::HeaderLength() const

	{

	return iLengthOfLength;

	}

*/

TWTLSDecUnsignedInteger::TWTLSDecUnsignedInteger()

	{

	}

TInt TWTLSDecUnsignedInteger::DecodeShortL(const TDesC8& aSource,TInt& aPos, TInt aLength)

	{

	if (aLength > 4)

		{

		User::Leave(KErrOverflow);

		}

	TInt sourceLength = aSource.Length();

	TInt res=0;

	while (aLength)

		{

		if (sourceLength <= aPos)

			{

			User::Leave(KErrArgument);

			}

		res<<=8;

		res+=aSource[aPos++];

		aLength--;

		}

	return res;

	}

RInteger TWTLSDecUnsignedInteger::DecodeLongL(const TDesC8& aSource,TInt& aPos, TInt aLength)

	{

	if (aSource.Length() < (aPos + aLength))

		{

		User::Leave(KErrArgument);

		}

	const TPtrC8 ptr = aSource.Mid(aPos, aLength);

	aPos += aLength;

	RInteger res = RInteger::NewL(ptr);

	return res;

	}

TWTLSDecTime::TWTLSDecTime()

	{

	}

TTime TWTLSDecTime::DecodeL(const TDesC8& aSource, TInt& aPos)

	{

	if ((aSource.Length() - aPos) < KTimeLength)

		{

		User::Leave(KErrArgument);

		}

	TWTLSDecUnsignedInteger decInt;

	TInt inc = decInt.DecodeShortL(aSource, aPos, 4);

	return WTLS_UNIX_BASE + TTimeIntervalSeconds(inc);

	}