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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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