filemanager.h Example File | Qt Network 5.6

Qt 5.6 | Qt Network | Torrent Example | filemanager.h Example File

Qt 5.6.2 Reference Documentation

# filemanager.h Example File

torrent/filemanager.h

      /****************************************************************************
      **
      ** Copyright (C) 2015 The Qt Company Ltd.
      ** Contact: http://www.qt.io/licensing/
      **
      ** This file is part of the examples of the Qt Toolkit.
      **
      ** $QT_BEGIN_LICENSE:BSD$
      ** You may use this file under the terms of the BSD license as follows:
      **
      ** "Redistribution and use in source and binary forms, with or without
      ** modification, are permitted provided that the following conditions are
      ** met:
      **   * Redistributions of source code must retain the above copyright
      **     notice, this list of conditions and the following disclaimer.
      **   * Redistributions in binary form must reproduce the above copyright
      **     notice, this list of conditions and the following disclaimer in
      **     the documentation and/or other materials provided with the
      **     distribution.
      **   * Neither the name of The Qt Company Ltd nor the names of its
      **     contributors may be used to endorse or promote products derived
      **     from this software without specific prior written permission.
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      #ifndef FILEMANAGER_H
      #define FILEMANAGER_H

      #include <QBitArray>
      #include <QList>
      #include <QMutex>
      #include <QThread>
      #include <QWaitCondition>

      #include "metainfo.h"

      class QByteArray;
      class QFile;
      class QTimerEvent;

      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() Q_DECL_OVERRIDE;

      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