/****************************************************************************

**

** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).

** All rights reserved.

** Contact: Nokia Corporation (qt-info@nokia.com)

**

** This file is part of the QtCore module of the Qt Toolkit.

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** GNU Lesser General Public License Usage

** This file may be used under the terms of the GNU Lesser General Public

** License version 2.1 as published by the Free Software Foundation and

** appearing in the file LICENSE.LGPL included in the packaging of this

** file. Please review the following information to ensure the GNU Lesser

** General Public License version 2.1 requirements will be met:

** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.

**

** In addition, as a special exception, Nokia gives you certain additional

** rights. These rights are described in the Nokia Qt LGPL Exception

** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.

**

** GNU General Public License Usage

** Alternatively, this file may be used under the terms of the GNU General

** Public License version 3.0 as published by the Free Software Foundation

** and appearing in the file LICENSE.GPL included in the packaging of this

** file. Please review the following information to ensure the GNU General

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** $QT_END_LICENSE$

**

****************************************************************************/

#include "qsharedmemory.h"

#include "qsharedmemory_p.h"

#include "qcore_symbian_p.h"

#include <qdebug.h>

#ifndef QT_NO_SHAREDMEMORY

#define QSHAREDMEMORY_DEBUG

QT_BEGIN_NAMESPACE

QSharedMemoryPrivate::QSharedMemoryPrivate()

    : QObjectPrivate(), memory(0), size(0), error(QSharedMemory::NoError),

#ifndef QT_NO_SYSTEMSEMAPHORE

      systemSemaphore(QString()), lockedByMe(false)

#endif

{

}

void QSharedMemoryPrivate::setErrorString(const QString &function, TInt errorCode)

{

    if (errorCode == KErrNone)

        return;

    switch (errorCode) {

    case KErrAlreadyExists:

        error = QSharedMemory::AlreadyExists;

        errorString = QSharedMemory::tr("%1: already exists").arg(function);

    break;

    case KErrNotFound:

        error = QSharedMemory::NotFound;

        errorString = QSharedMemory::tr("%1: doesn't exists").arg(function);

        break;

    case KErrArgument:

        error = QSharedMemory::InvalidSize;

        errorString = QSharedMemory::tr("%1: invalid size").arg(function);

        break;

    case KErrNoMemory:

        error = QSharedMemory::OutOfResources;

        errorString = QSharedMemory::tr("%1: out of resources").arg(function);

        break;

    case KErrPermissionDenied:

        error = QSharedMemory::PermissionDenied;

        errorString = QSharedMemory::tr("%1: permission denied").arg(function);

        break;

    default:

        errorString = QSharedMemory::tr("%1: unknown error %2").arg(function).arg(errorCode);

        error = QSharedMemory::UnknownError;

#if defined QSHAREDMEMORY_DEBUG

        qDebug() << errorString << "key" << key;

#endif

        break;

    }

}

key_t QSharedMemoryPrivate::handle()

{

    // don't allow making handles on empty keys

    if (nativeKey.isEmpty()) {

        error = QSharedMemory::KeyError;

        errorString = QSharedMemory::tr("%1: key is empty").arg(QLatin1String("QSharedMemory::handle"));

        return 0;

    }

    // Not really cost effective to check here if shared memory is attachable, as it requires

    // exactly the same call as attaching, so always assume handle is valid and return failure

    // from attach.

    return 1;

}

void QSharedMemoryPrivate::cleanHandle()

{

    chunk.Close();

}

bool QSharedMemoryPrivate::create(int size)

{

    if (!handle())

        return false;

    TPtrC ptr(qt_QString2TPtrC(nativeKey));

    TInt err = chunk.CreateGlobal(ptr, size, size);

    if (err != KErrNone) {

        setErrorString(QLatin1String("QSharedMemory::create"), err);

        return false;

    }

    // Zero out the created chunk

    Mem::FillZ(chunk.Base(), chunk.Size());

    return true;

}

bool QSharedMemoryPrivate::attach(QSharedMemory::AccessMode /* mode */)

{

    // Grab a pointer to the memory block

    if (!chunk.Handle()) {

        if (!handle())

            return false;

        TPtrC ptr(qt_QString2TPtrC(nativeKey));

        TInt err = KErrNoMemory;

        err = chunk.OpenGlobal(ptr, false);

        if (err != KErrNone) {

            setErrorString(QLatin1String("QSharedMemory::attach"), err);

            return false;

        }

    }

    size = chunk.Size();

    memory = chunk.Base();

    return true;

}

bool QSharedMemoryPrivate::detach()

{

    chunk.Close();

    memory = 0;

    size = 0;

    return true;

}

QT_END_NAMESPACE

#endif //QT_NO_SHAREDMEMORY