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// Copyright (c) 2006-2009 Nokia Corporation and/or its subsidiary(-ies).
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// All rights reserved.
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// This component and the accompanying materials are made available
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// under the terms of "Eclipse Public License v1.0"
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// which accompanies this distribution, and is available
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// at the URL "http://www.eclipse.org/legal/epl-v10.html".
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//
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// Initial Contributors:
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// Nokia Corporation - initial contribution.
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//
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// Contributors:
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//
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// Description:
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// Name : TTlv.cpp
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// Part of : Series 60 / utility
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// Based on 3GPP TS 11.14 V8.8.0
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// Version : 1.0
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// EXTERNAL RESOURCES
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//
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// Include Files
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#include "TTlv.h" // Header of this class
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#include "tflogger.h" // For logging
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// External Data Structures
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// none
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// External Function Prototypes
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// none
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// LOCAL CONSTANTS AND MACROS
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// none
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// MODULE DATA STRUCTURES
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// none
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// Local Data Structures
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// none
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// Local Function Prototypes
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// none
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// LOCAL FUNCTIONS
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// none
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// MEMBER FUNCTIONS
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//=============================================================================
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// -----------------------------------------------------------------------------
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// TTlvBase::TTlvBase
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// constructor
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// -----------------------------------------------------------------------------
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//
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EXPORT_C TTlvBase::TTlvBase
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(
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TDes8& aData
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) : iData(aData)
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{
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// Do nothing.
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}
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// -----------------------------------------------------------------------------
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// TTlvBase::Begin
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// Start BER-TLV construction
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// -----------------------------------------------------------------------------
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//
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EXPORT_C void TTlvBase::Begin
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(
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TUint8 aTag
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)
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{
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TFLOGSTRING("UTILITY: TTlvBase::Begin");
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iData.Zero();
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iData.Append( aTag );
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iData.Append( 0 );
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}
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// -----------------------------------------------------------------------------
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// TTlvBase::AddTag
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// Start new simple TLV
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// -----------------------------------------------------------------------------
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//
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EXPORT_C void TTlvBase::AddTag
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(
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TUint8 aTag
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)
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{
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TFLOGSTRING("UTILITY: TTlvBase::AddTag");
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iData.Append( aTag ); // tag
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iData.Append( 0 ); // length
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iLenIndex = iData.Length() - 1; // index to tag length
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}
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// -----------------------------------------------------------------------------
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// TTlvBase::AddByte
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// Add byte data to simple TLV
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// -----------------------------------------------------------------------------
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//
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EXPORT_C void TTlvBase::AddByte
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(
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TUint8 aValue
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)
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{
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TFLOGSTRING("UTILITY: TTlvBase::AddByte");
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iData.Append( aValue );
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iData[iLenIndex]++;
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}
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// -----------------------------------------------------------------------------
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// TTlvBase::AddData
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// Add desctiptor data to simple TLV
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// -----------------------------------------------------------------------------
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//
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EXPORT_C void TTlvBase::AddData
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(
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const TDesC8& aValue
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)
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{
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TFLOGSTRING("UTILITY: TTlvBase::AddData");
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iData.Append( aValue );
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iData[ iLenIndex ] = static_cast<TUint8>( iData[ iLenIndex ] +
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aValue.Length() );
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}
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// -----------------------------------------------------------------------------
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// TTlvBase::End
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// End BER-TLV construction. Adds extra length byte to all simple TLVs that
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// are longer than KMaxOneByteLength (0x7f) and returns descriptor to the new
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// valid BER-TLV.
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// -----------------------------------------------------------------------------
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//
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EXPORT_C const TDesC8& TTlvBase::End
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(
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// None
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)
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{
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TFLOGSTRING("UTILITY: TTlvBase::End");
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_LIT8( KLenTag, "\x81" );
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TInt i( 3 ); // Index to tag length
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// Scan through all lenghts and insert 'length tag'
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while ( i < iData.Length() )
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{
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if ( iData[i] > KMaxOneByteLength )
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{
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iData.Insert( i, KLenTag );
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i++;
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}
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i += iData[i] + 2; // jump to next tag length
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}
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// Calculate total BER-TLV length
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iData[1] = static_cast<TUint8>( iData.Length() - 2 );
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// Insert 'length tag'
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if ( iData[1] > KMaxOneByteLength )
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{
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iData.Insert( 1, KLenTag );
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}
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// Done, return BER-TLV
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return iData;
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}
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// -----------------------------------------------------------------------------
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// TTlvBase::GetDataWithoutTopLevelTag
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// End TLV construction. Adds extra length byte to all simple TLVs that are
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// longer than KMaxOneByteLength (0x7f) and returns descriptor to the valid
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// TLVs. To be used without Begin(), nor End() in situations where TLV simple
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// tags are used without top level tag.
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// -----------------------------------------------------------------------------
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//
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EXPORT_C const TDesC8& TTlvBase::GetDataWithoutTopLevelTag
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(
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// None
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)
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{
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TFLOGSTRING("UTILITY: TTlvBase::GetDataWithoutTopLevelTag");
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_LIT8( KLenTag, "\x81" );
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TInt i( 1 ); // Index to tag length
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// Scan through all lenghts and insert 'length tag'
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while ( i < iData.Length() )
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{
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if ( iData[i] > KMaxOneByteLength )
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{
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iData.Insert( i, KLenTag );
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i++;
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}
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i += iData[i] + 2; // Jump to next tag length
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}
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// Done, return BER-TLV
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return iData;
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}
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//End Of File
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