camerauis/cameraxui/cxengine/src/cxesysutil.cpp
author hgs
Thu, 13 May 2010 21:30:19 +0300
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permissions -rw-r--r--
201017_1
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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 "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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#include <algorithm>
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#include <exception>
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#include <e32const.h>
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#include <f32file.h>
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#include <driveinfo.h>
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#include <sysutil.h>
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#include <sysutildomaincrkeys.h>
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#include "cxesettings.h"
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#include "cxutils.h"
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#include "cxesysutil.h"
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namespace
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{
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    const uint KDiskSafetyLimit = 400000; // Amount of free disk space to leave unused
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}
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/*!
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* Checks if free disk drive storage space is or will fall below critical
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* level. Static configuration values stored in Central Repository are
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* used to determine a critical level for each drive.
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*
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* Usage example:
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* @code
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* TInt dataSize = 500;
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* if ( SysUtil::DiskSpaceBelowCriticalLevelL( &iFsSession, dataSize, EDriveC ) )
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*     {
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*     // Can not write the data, there's not enough free space on disk.
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*     ...
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*     }
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* else
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*     {
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*     // It's ok to actually write the data.
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*     ...
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*     }
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* @endcode
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*
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* @since S60 v2.0
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*
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* @param aFs File server session. Must be given if available, e.g. from
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*            EIKON environment. If NULL, this method will create a
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*            temporary session, which causes the method to consume more
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*            time and system resources.
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* @param aBytesToWrite Number of bytes the caller is about to write to
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*                      disk. If value 0 is given, this method checks
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*                      if the current disk space is already below critical
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*                      level.
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* @param aDrive Identifies the disk drive to be checked. Numeric values
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*               for identifying disk drives are defined in TDriveNumber
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*               enumeration.
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*
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* @see TDriveNumber in f32file.h.
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*
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* @return ETrue if disk space would go below critical level after writing
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*         aBytesToWrite more data, EFalse otherwise.
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*
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* @leave Leaves with one of the Symbian error codes if checking the disk
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*        space fails, for instance if the drive contains no media or there
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*        is not enough free memory to create a temporary connection to
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*        file server.
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*/
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TBool CxeSysUtil::DiskSpaceBelowCriticalLevel(
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        RFs* aFs,
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        TInt aBytesToWrite,
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        TInt aDrive )
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{
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    TBool fullDisk = EFalse;
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    TRAPD( utilErr,
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            fullDisk = SysUtil::DiskSpaceBelowCriticalLevelL(
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                    aFs, aBytesToWrite, aDrive ) );
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    if(utilErr) {
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        fullDisk = EFalse;
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    }
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    return fullDisk;
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}
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/*!
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* Get the drive index to use for camera.
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* Normally it is mass memory, but if that is not available in the device at all,
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* using phone memory. It should be noted, that if mass memory is temporarily
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* unavailable, storage will not be changed to phone memory, but space available
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* will report zero.
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*/
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int CxeSysUtil::getCameraDrive(RFs &fs)
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{
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    CX_DEBUG_ENTER_FUNCTION();
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    int index(-1);
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    try {
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        // Get drive index for mass storage
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        int status(DriveInfo::GetDefaultDrive(DriveInfo::EDefaultMassStorage, index));
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        CX_DEBUG(("status getting mass memory drive index: %d", status));
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        qt_symbian_throwIfError(status);
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        // Get the drive info
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        TDriveInfo driveInfo;
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        status = fs.Drive(driveInfo, index);
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        CX_DEBUG(("status getting mass memory drive info: %d", status));
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        qt_symbian_throwIfError(status);
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        // If and only if mass memory drive does not exist at all,
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        // we resort to phone internal memory (c-drive).
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        // E.g. dismounted mass memory because of USB connection is intentionally
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        // *not* causing us to switch to phone memory.
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        if (driveInfo.iDriveAtt == KDriveAbsent) {
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            CX_DEBUG(("[WARNING]: Mass memory not found at all, resorting to phone memory!"));
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            status = DriveInfo::GetDefaultDrive(DriveInfo::EDefaultPhoneMemory, index);
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            CX_DEBUG(("status getting phone memory drive index: %d", status));
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        }
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        qt_symbian_throwIfError(status);
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    } catch(const std::exception& e) {
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        Q_UNUSED(e); // avoid warning if trace is not used.
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        CX_DEBUG(("[WARNING]: exception [%s]", e.what()));
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    }
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    CX_DEBUG_EXIT_FUNCTION();
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    return index;
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}
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/*!
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* Return space available for Camera to use.
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* @param fs File Server session
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* @param index Index for the drive to be checked.
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* @param settings Camera settings instance
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* @return Amount of bytes free for Camera usage.
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*/
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qint64 CxeSysUtil::spaceAvailable(RFs &fs, int index, CxeSettings &settings)
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{
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    CX_DEBUG_ENTER_FUNCTION();
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    qint64 freeSpace(0);
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    try {
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        // Get volume info
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        TVolumeInfo volumeInfo;
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        int status(fs.Volume(volumeInfo, index));
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        CX_DEBUG(("status getting volume info: %d", status));
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        qt_symbian_throwIfError(status);
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   156
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        CX_DEBUG(("TVolumeInfo.iDrive.iType:     %d", volumeInfo.iDrive.iType));
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        CX_DEBUG(("  EMediaNotPresent:           %d", EMediaNotPresent));
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        CX_DEBUG(("  EMediaUnknown:              %d", EMediaUnknown));
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        CX_DEBUG(("TVolumeInfo.iDrive.iMediaAtt: %d", volumeInfo.iDrive.iMediaAtt));
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        CX_DEBUG(("  KMediaAttLocked:            %d", KMediaAttLocked));
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        // Get critical treshold for free space on the drive.
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        // We must leave the free space above this.
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        QVariant criticalThreshold;
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        settings.get(KCRUidDiskLevel.iUid, KDiskCriticalThreshold, Cxe::Repository, criticalThreshold);
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   167
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        // Calculate space that we can still use. A small safety buffer is used above critical value.
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        freeSpace = std::max(qint64(0), volumeInfo.iFree - criticalThreshold.toInt() - KDiskSafetyLimit);
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    } catch(const std::exception& e) {
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        Q_UNUSED(e);
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        CX_DEBUG(("[WARNING]: exception [%s]", e.what()));
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        freeSpace = 0;
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    }
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    CX_DEBUG_EXIT_FUNCTION();
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    return freeSpace;
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}
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// end of file