cbs/CbsServer/ServerSrc/CbsUtils.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Fri, 11 Jun 2010 14:07:16 +0300
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permissions -rw-r--r--
Revision: 201021 Kit: 2010123
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/*
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* Copyright (c) 2003 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:  This module contains the implementation of CbsUtils class 
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*                 member functions.
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*
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*/
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// INCLUDE FILES
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#include <f32file.h>
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#include <barsc.h>
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#include <bautils.h>
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#include <sysutil.h>            // FFS critical level check
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#include "CbsUtils.h"
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#include <hal.h>
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#include <centralrepository.h>
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#include <UiklafInternalCRKeys.h>
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#include <data_caging_path_literals.hrh> 
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#include "CbsLogger.h"
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// ================= CONSTANTS =======================
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const TInt KRamMemoryCriticalLevel = 1500000;   // KRAMLOWTHRESHOLD = 1500000
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// ================= MEMBER FUNCTIONS =======================
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// -----------------------------------------------------------------------------
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// CbsUtils::FindAndOpenDefaultResourceFileLC
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// Searches and opens the DLL default resource file.
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// (other items were commented in a header).
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// -----------------------------------------------------------------------------
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//
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void CbsUtils::FindAndOpenDefaultResourceFileLC(
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    RFs& aFs, 
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    RResourceFile& aResFile )
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    {
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    // default resource file path
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	_LIT(KDirAndFile,"z:CbsServer.rsc"); 
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	TParse* fp = new(ELeave) TParse(); 
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	fp->Set(KDirAndFile, &KDC_RESOURCE_FILES_DIR, NULL); 
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    static const TInt KDefResFileSignature = 4;
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    // Find the resource file
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    TFileName fileName( fp->FullName() ); 
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    BaflUtils::NearestLanguageFile( aFs, fileName );
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    // Open the resource file
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    aResFile.OpenL( aFs, fileName );
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    // Push close operation in tbe cleanup stack
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    CleanupClosePushL( aResFile );
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    aResFile.ConfirmSignatureL( KDefResFileSignature );
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	delete fp;
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    }
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// -----------------------------------------------------------------------------
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// CbsUtils::FFSCriticalLevelCheckL
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// Checks that there is space for writing data on FFS.
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// (other items were commented in a header).
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// -----------------------------------------------------------------------------
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//
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void CbsUtils::FFSCriticalLevelCheckL( 
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    const TInt aBytesToWrite, 
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    RFs& aFs )
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    {
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    CBSLOGSTRING("CBSSERVER: >>> CbsUtils::FFSCriticalLevelCheckL()");
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    // Checks RAM memory critical level.
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    if (RamMemCriticalLevelCheckL( aBytesToWrite ))
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        {
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        User::Leave( KErrDiskFull );    // returns KErrDiskFull -> no changes to clients
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        }
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    // Checks RAM disk critical level
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    if ( SysUtil::FFSSpaceBelowCriticalLevelL( &aFs, aBytesToWrite ) )
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        {
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        User::Leave( KErrDiskFull );
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        }
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    CBSLOGSTRING("CBSSERVER: <<< CbsUtils::FFSCriticalLevelCheckL()");
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    }
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// -----------------------------------------------------------------------------
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// CbsUtils::RamMemCriticalLevelCheckL
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// Checks that there is space for allocating data in memory.
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// (other items were commented in a header).
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// -----------------------------------------------------------------------------
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//
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TBool CbsUtils::RamMemCriticalLevelCheckL( 
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    const TInt aBytesToWrite)
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    {
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    // Read the critical threahold RAM memory level from the repository.
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    TInt thresholdVal;
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    CRepository* repository = CRepository::NewLC( KCRUidUiklaf );
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    if (repository->Get( KUikOOMRamLowThreshold, thresholdVal ) != KErrNone)
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        {
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        thresholdVal = KRamMemoryCriticalLevel;
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        }
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    CleanupStack::PopAndDestroy( repository );
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    TInt freeMem = 0;
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    HAL::Get(HAL::EMemoryRAMFree, freeMem);
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    if ( freeMem > (thresholdVal + aBytesToWrite) )
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        {
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        return EFalse;
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        }
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    return ETrue;
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    }
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// -----------------------------------------------------------------------------
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// CbsUtils::VolumeCriticalLevelCheckL
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// Leaves with KErrDiskFull if writing aBytesToWrite bytes 
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// to the RAM File System would reduce the free space on RAM 
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// under the critical level.
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// (other items were commented in a header).
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// -----------------------------------------------------------------------------
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//
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void CbsUtils::VolumeCriticalLevelCheckL( 
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    const TDesC& aFileName, 
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    TInt aBytesToWrite, 
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    const RFs& aFs )
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    {
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    // Convert file name to a volume number
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    TInt volumeNumber;
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    aFs.CharToDrive( aFileName[0], volumeNumber );
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    // Find out if the volume has enough free space
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    TVolumeInfo volume;
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    User::LeaveIfError( aFs.Volume( volume, volumeNumber ) );
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    if ( volume.iFree < aBytesToWrite )
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        {
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        User::Leave( KErrDiskFull );
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        }
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    }
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// -----------------------------------------------------------------------------
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// CbsUtils::ExistsL
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// Returns ETrue, if the file aFile exists.
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// (other items were commented in a header).
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// -----------------------------------------------------------------------------
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//
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TBool CbsUtils::ExistsL( 
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    const RFs& aFs, 
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    const TDesC& aFile )
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    {
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    TParse filename;
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    aFs.Parse( aFile, filename );
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    TBool returnCode( EFalse );
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	TUint attributes;
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    TInt result( aFs.Att( filename.FullName(), attributes ) );
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    if ( result == KErrNone )
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        {
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        returnCode = ETrue;
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        }
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    else if ( result == KErrNotFound ) 
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        {
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        returnCode = EFalse;
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        }
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    else 
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        {
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        User::Leave( result );
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        }
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    return returnCode;  
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    }
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// -----------------------------------------------------------------------------
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// CbsUtils::DeleteFileL
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// Deletes the given file.
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// (other items were commented in a header).
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// -----------------------------------------------------------------------------
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//
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void CbsUtils::DeleteFileL( 
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    RFs& aFs, 
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    const TDesC& aFile )
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    {
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    TInt result( aFs.Delete( aFile ) );
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    if ( result != KErrNone && 
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        result != KErrNotFound && 
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        result != KErrPathNotFound )
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        {
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        User::Leave( result );
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        }
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    }
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// ========================== OTHER EXPORTED FUNCTIONS =========================
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// End of File
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