// All rights reserved.

// This component and the accompanying materials are made available

// under the terms of "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:

// Name        : TTlv.cpp

// Part of     : Series 60 / utility

// Based on 3GPP TS 11.14 V8.8.0 

// Version     : 1.0

// EXTERNAL RESOURCES  

//

//  Include Files  

#include "TTlv.h"				    // Header of this class

//  External Data Structures  

//    none

//  External Function Prototypes  

//    none

//  LOCAL CONSTANTS AND MACROS  

//    none

//  MODULE DATA STRUCTURES  

//    none

//  Local Data Structures  

//    none

//  Local Function Prototypes  

//    none

//  LOCAL FUNCTIONS

//    none

//  MEMBER FUNCTIONS

//=============================================================================

// -----------------------------------------------------------------------------

// TTlvBase::TTlvBase

// constructor

// -----------------------------------------------------------------------------

//

EXPORT_C TTlvBase::TTlvBase

        ( 

        TDes8& aData

        ) : iData(aData)

    {

    // Do nothing.

    }

// -----------------------------------------------------------------------------

// TTlvBase::Begin

// Start BER-TLV construction

// -----------------------------------------------------------------------------

//

EXPORT_C void TTlvBase::Begin

        ( 

        TUint8 aTag 

        )

    {

    iData.Zero();

    iData.Append( aTag );

    iData.Append( 0 );

    }

// -----------------------------------------------------------------------------

// TTlvBase::AddTag

// Start new simple TLV

// -----------------------------------------------------------------------------

//

EXPORT_C void TTlvBase::AddTag

        ( 

        TUint8 aTag 

        )

    {

    iData.Append( aTag );           // tag

    iData.Append( 0 );              // length

    iLenIndex = iData.Length() - 1; // index to tag length

    }

// -----------------------------------------------------------------------------

// TTlvBase::AddByte

// Add byte data to simple TLV

// -----------------------------------------------------------------------------

//

EXPORT_C void TTlvBase::AddByte

        ( 

        TUint8 aValue  

        )

    {

    iData.Append( aValue );

    iData[iLenIndex]++;

    }

// -----------------------------------------------------------------------------

// TTlvBase::AddData

// Add desctiptor data to simple TLV

// -----------------------------------------------------------------------------

//

EXPORT_C void TTlvBase::AddData

        ( 

        const TDesC8& aValue 

        )

    {

    iData.Append( aValue );

    iData[ iLenIndex ] = static_cast<TUint8>( iData[ iLenIndex ] + 

        aValue.Length() );

    }

// -----------------------------------------------------------------------------

// TTlvBase::End

// End BER-TLV construction. Adds extra length byte to all simple TLVs that 

// are longer than KMaxOneByteLength (0x7f) and returns descriptor to the new 

// valid BER-TLV.

// -----------------------------------------------------------------------------

//

EXPORT_C const TDesC8& TTlvBase::End

        (

        // None

        )

    {

    _LIT8( KLenTag, "\x81" );

    TInt i( 3 ); // Index to tag length

    // Scan through all lenghts and insert 'length tag'

    while ( i < iData.Length() )

        {

        if ( iData[i] > KMaxOneByteLength )

            {

            iData.Insert( i, KLenTag );

            i++;

            }

        i += iData[i] + 2; // jump to next tag length

        }

    // Calculate total BER-TLV length

    iData[1] = static_cast<TUint8>( iData.Length() - 2 );

    // Insert 'length tag'

    if ( iData[1] > KMaxOneByteLength )

        {

        iData.Insert( 1, KLenTag );

        }

    // Done, return BER-TLV

    return iData;

    }

// -----------------------------------------------------------------------------

// TTlvBase::GetDataWithoutTopLevelTag

// End TLV construction. Adds extra length byte to all simple TLVs that are 

// longer than KMaxOneByteLength (0x7f) and returns descriptor to the valid 

// TLVs. To be used without Begin(), nor End() in situations where TLV simple 

// tags are used without top level tag.

// -----------------------------------------------------------------------------

//

EXPORT_C const TDesC8& TTlvBase::GetDataWithoutTopLevelTag

        (

        // None

        )

    {

    _LIT8( KLenTag, "\x81" );

    TInt i( 1 ); // Index to tag length

    // Scan through all lenghts and insert 'length tag'

    while ( i < iData.Length() )

        {

        if ( iData[i] > KMaxOneByteLength )

            {

            iData.Insert( i, KLenTag );

            i++;

            }

        i += iData[i] + 2; // Jump to next tag length

        }

    // Done, return BER-TLV

    return iData;

    }

//End Of File