localconnectivityservice/generichid/src/hiditem.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Mon, 18 Jan 2010 21:03:15 +0200
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/*
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* Copyright (c) 2004-2007 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:  Item implementation
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*
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*/
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// References:
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//
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// [1] USB Device Class Definition for Human Interface Devices (HID),
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//     Firmware Specification, Version 1.11, USB Implementers' Forum,
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//     June 2001
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//
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// ----------------------------------------------------------------------
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#include <e32std.h>
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#include "hiditem.h"
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#include "hidparser.h"
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const TInt KSizeMask        = 0x03;
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const TInt KTypeMask        = 0x03;
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const TInt KTypePosn        = 2;
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const TInt KTagMask         = 0x0F;
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const TInt KTagPosn         = 4;
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const TInt KLongItemId      = 0xfe;
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const TInt KMaxItemlength   = 4;
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const TInt KSizeThree       = 3;
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const TInt KSizeFour        = 4;
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const TInt KLongItemMin     = 3;
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// ======== MEMBER FUNCTIONS ========
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// ---------------------------------------------------------------------------
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// Constructor
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// ---------------------------------------------------------------------------
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//
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TItem::TItem(const TDesC8& aRawData)
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    : iRawData(aRawData)
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    {    
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    if (aRawData.Length() < 1)
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        {
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        return;
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        }
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    TBool isShortItem = (aRawData[0] != KLongItemId);
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    if (isShortItem)
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        {
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        //  +----+----+----+----+----+----+----+----+
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        //  |        Tag        |   Type  |  Size   |    [data...]
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        //  |    .    .    .    |    .    |    .    |
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        //  +----+----+----+----+----+----+----+----+
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        //    7    6    5    4    3    2    1     0
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        //
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        // A short item is followed by 0, 1, 2 or 4 bytes of data, as
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        // specified in the size field. See [1], Section 6.2.2.2.        
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        iSize = aRawData[0] & KSizeMask;
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        if (iSize == KSizeThree)
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            {
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            iSize = KSizeFour;
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            }        
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        iType = static_cast<TItemType>((aRawData[0] >> KTypePosn) & KTypeMask);
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        iTag = (aRawData[0] >> KTagPosn) & KTagMask;
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        iDataOffset = 1;
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        }
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    else
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        {
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        //        Byte 0               Byte 1          Byte 2
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        // +------+------+------+   +-----------+   +-----------+
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        // | Tag  | Type | Size |   | Data size |   | Long item |   [data...]
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        // | 1111 |  11  |  10  |   |  (0-255)  |   |    tag    |
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        // +------+------+------+   +-----------+   +-----------+
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        //   7654    32     10
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        //
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        // A long item is followed by 0-255 bytes of data, as specified
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        // in the data size byte. See [1], Section 6.2.2.3.
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        iType = EReserved;
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        if (aRawData.Length() > KLongItemMin)
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            {
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            iSize = aRawData[1];
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            iTag = aRawData[2];
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            iDataOffset = KLongItemMin;
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            }
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        else
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            {
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            iSize = 0;
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            iTag = 0;
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            iDataOffset = 0;
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            }
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        }
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#ifdef DBG_ACTIVE
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    for (TInt i=0; (i<aRawData.Length()) && (i<(iSize+iDataOffset)); ++i)
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        {
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        RDebug::Print(_L("aRawData[%d] = 0x%02x"), i, aRawData[i]);
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        }
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#endif
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    }
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// ---------------------------------------------------------------------------
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// DataSize()
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// ---------------------------------------------------------------------------
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//
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TInt TItem::DataSize() const
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    {
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    return iSize;
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    }
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// ---------------------------------------------------------------------------
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// Tag()
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// ---------------------------------------------------------------------------
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//
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TInt TItem::Tag() const
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    {
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    return iTag;
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    }
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// ---------------------------------------------------------------------------
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// Data()
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// ---------------------------------------------------------------------------
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//
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TUint32 TItem::Data() const
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    {
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    TInt size = DataSize();
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    // Calling Data() makes no sense for long items that have a data
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    // size over 4 bytes, as it only returns a TUint32:
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    //
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    if (size > KMaxItemlength)
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        {
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        size = KMaxItemlength;
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        }
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    // Ensure we don't overrun the source buffer:
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    //
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    if (size > (iRawData.Length() - 1))
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        {
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        size = iRawData.Length() - 1;
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        }
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    // Concatenate each byte into a TUint32.  Note that this function must
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    // return zero if the data size is zero (see Parser.cpp, MainItemL()).
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    //
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    TUint32 tagData = 0;
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    for (TInt i=0; i<size; ++i)
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        {
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        tagData |= (iRawData[1 + i] << (KSizeOfByte*i));
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        }
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    return tagData;
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    }
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// ---------------------------------------------------------------------------
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// SignedData()
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// ---------------------------------------------------------------------------
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//
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TInt32 TItem::SignedData() const
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    {
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    TUint32 data = Data();
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    // For 8 and 16 bit negative values, we need to
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    // sign extend to 32-bits:
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    //
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    if ((DataSize() == 1) && (data & 0x80))
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        {
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        data |= 0xffffff00;
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        }
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    if ((DataSize() == 2) && (data & 0x8000))
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        {
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        data |= 0xffff0000;
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        }
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    // Note that this assumes that the machine uses 2s complement
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    // representation internally.  All current Symbian devices do,
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    // including ARM devices and the WINS emulator. This is almost
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    // certain to remain the case in the future.
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    //
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    return static_cast<TInt32>(data);
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    }
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// ---------------------------------------------------------------------------
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// Operator []
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// ---------------------------------------------------------------------------
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//
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TUint8 TItem::operator[](TInt aIndex) const
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    {    
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    TUint8 value = 0;
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    if ((aIndex >= 0) && (aIndex < iSize))
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        {
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        value = iRawData[iDataOffset + aIndex];
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        }
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    return value;
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    }
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// ---------------------------------------------------------------------------
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// Type()
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// ---------------------------------------------------------------------------
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//
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TItem::TItemType TItem::Type() const
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    {
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    return iType;
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    }
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// ---------------------------------------------------------------------------
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// IsMain()
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// ---------------------------------------------------------------------------
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//
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TBool TItem::IsMain() const
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    {
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    return iType == TItem::EMain;
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    }
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// ---------------------------------------------------------------------------
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// IsLocal()
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// ---------------------------------------------------------------------------
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//
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TBool TItem::IsLocal() const
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    {
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    return iType == TItem::ELocal;
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    }
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// ---------------------------------------------------------------------------
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// IsGlobal()
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// ---------------------------------------------------------------------------
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//
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TBool TItem::IsGlobal() const
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    {
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    return iType == TItem::EGlobal;
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    }
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// ---------------------------------------------------------------------------
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// IsLong()
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// ---------------------------------------------------------------------------
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//
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TBool TItem::IsLong() const
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    {
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    return iType == TItem::EReserved;
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    }
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// ---------------------------------------------------------------------------
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// ItemSize()
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// ---------------------------------------------------------------------------
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//
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TInt TItem::ItemSize() const
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    {
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    return iSize + iDataOffset;
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    }
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