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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, 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 1.0, 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 Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef FILEMANAGER_H
+#define FILEMANAGER_H
+
+#include <QBitArray>
+#include <QList>
+#include <QMutex>
+#include <QThread>
+#include <QWaitCondition>
+
+#include "metainfo.h"
+
+QT_BEGIN_NAMESPACE
+class QByteArray;
+class QFile;
+class QTimerEvent;
+QT_END_NAMESPACE
+
+class FileManager : public QThread
+{
+    Q_OBJECT
+
+public:
+    FileManager(QObject *parent = 0);
+    virtual ~FileManager();
+
+    inline void setMetaInfo(const MetaInfo &info) { metaInfo = info; }
+    inline void setDestinationFolder(const QString &directory) { destinationPath = directory; }
+    
+    int read(int pieceIndex, int offset, int length);
+    void write(int pieceIndex, int offset, const QByteArray &data);
+    void verifyPiece(int pieceIndex);
+    inline qint64 totalSize() const { return totalLength; }
+
+    inline int pieceCount() const { return numPieces; }
+    int pieceLengthAt(int pieceIndex) const;
+
+    QBitArray completedPieces() const;
+    void setCompletedPieces(const QBitArray &pieces);
+
+    QString errorString() const;
+
+public slots:
+    void startDataVerification();
+
+signals:
+    void dataRead(int id, int pieceIndex, int offset, const QByteArray &data);
+    void error();
+    void verificationProgress(int percent);
+    void verificationDone();
+    void pieceVerified(int pieceIndex, bool verified);
+
+protected:
+    void run();
+
+private slots:
+    bool verifySinglePiece(int pieceIndex);
+    void wakeUp();
+
+private:
+    bool generateFiles();
+    QByteArray readBlock(int pieceIndex, int offset, int length);
+    bool writeBlock(int pieceIndex, int offset, const QByteArray &data);
+    void verifyFileContents();
+
+    struct WriteRequest {
+        int pieceIndex;
+        int offset;
+        QByteArray data;
+    };
+    struct ReadRequest {
+        int pieceIndex;
+        int offset;
+        int length;
+        int id;
+    };
+
+    QString errString;
+    QString destinationPath;
+    MetaInfo metaInfo;
+    QList<QFile *> files;
+    QList<QByteArray> sha1s;
+    QBitArray verifiedPieces;
+
+    bool newFile;
+    int pieceLength;
+    qint64 totalLength;
+    int numPieces;
+    int readId;
+    bool startVerification;
+    bool quit;
+    bool wokeUp;
+
+    QList<WriteRequest> writeRequests;
+    QList<ReadRequest> readRequests;
+    QList<int> pendingVerificationRequests;
+    QList<int> newPendingVerificationRequests;
+    QList<qint64> fileSizes;
+
+    mutable QMutex mutex;
+    mutable QWaitCondition cond;
+};
+
+#endif