author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Thu, 07 Jan 2010 13:38:45 +0200 | |
changeset 10 | 36bfc973b146 |
parent 9 | 96e5fb8b040d |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 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 the License "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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* |
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*/ |
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// |
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// tmsmemmap.cpp |
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// |
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// Maps a position to mass storage address space |
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// |
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/** @file |
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@internalTechnology |
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*/ |
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#include <e32def.h> |
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#include <e32err.h> |
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#include "tmsmemmap.h" |
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#include "debug.h" |
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TMsDataMemMap::TMsDataMemMap() |
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{ |
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__MSFNSLOG |
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Reset(); |
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} |
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|
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/** |
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Checks that the block is within the limits of the media memory address space |
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and truncates the length if block extends beyond media size. |
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|
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@param aPos [IN] Position of start address [OUT] Adjusted position to real |
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address on media. |
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@param aLength [IN] Number of bytes [OUT] Number of bytes truncated in case |
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of block overflow. |
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|
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@return TInt KErrNone if block fits. KErrArgument if start position is |
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greater than the media size. KErrEof if block extends beyond media size. |
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*/ |
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TInt TMsDataMemMap::TranslateDataPos(TInt64& aPos, TInt& aLength) const |
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{ |
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__MSFNSLOG |
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// Map to the actual position on the media |
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aPos += iDataOffset; |
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if (aPos > iSize) |
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{ |
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return KErrArgument; |
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} |
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TInt64 endPos = aPos + aLength; |
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if (endPos > iSize) |
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{ |
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aLength = iSize - aPos; |
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return KErrEof; |
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} |
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return KErrNone; |
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} |
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|
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/** |
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Checks that the block is within the limits of the media memory address space |
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|
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@param aPos [IN] Position of start address [OUT] Adjusted position to real |
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address on media. |
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@param aLength Number of bytes. |
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|
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@return TInt KErrNone if block fits. KErrArgument if start position is |
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greater than the media size. KErrEof if block extends beyond media size. |
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*/ |
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TInt TMsDataMemMap::CheckBlockInRange(TInt64& aPos, TInt aLength) const |
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{ |
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__MSFNSLOG |
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// Map to the actual position on the media |
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aPos += iDataOffset; |
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|
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if (aPos > iSize) |
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{ |
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return KErrArgument; |
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} |
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|
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TInt64 endPos = aPos + aLength; |
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if (endPos > iSize) |
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{ |
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__PXYPRINT2(_L("EOF found 0x%lx x%x"), aPos, aLength); |
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return KErrEof; |
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} |
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return KErrNone; |
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} |