Qt 5.6 | Qt Network | Torrent Example | metainfo.cpp Example File

Qt 5.6.3 Reference Documentation

# metainfo.cpp Example File

torrent/metainfo.cpp

      /****************************************************************************
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      ** Contact: http://www.qt.io/licensing/
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      ** This file is part of the examples of the Qt Toolkit.
      **
      ** $QT_BEGIN_LICENSE:BSD$
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      ** modification, are permitted provided that the following conditions are
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      #include "bencodeparser.h"
      #include "metainfo.h"

      #include <QDateTime>
      #include <QMetaType>
      #include <QString>

      MetaInfo::MetaInfo()
      {
          clear();
      }

      void MetaInfo::clear()
      {
          errString = "Unknown error";
          content.clear();
          infoData.clear();
          metaInfoMultiFiles.clear();
          metaInfoAnnounce.clear();
          metaInfoAnnounceList.clear();
          metaInfoCreationDate = QDateTime();
          metaInfoComment.clear();
          metaInfoCreatedBy.clear();
          metaInfoName.clear();
          metaInfoPieceLength = 0;
          metaInfoSha1Sums.clear();
      }

      bool MetaInfo::parse(const QByteArray &data)
      {
          clear();
          content = data;

          BencodeParser parser;
          if (!parser.parse(content)) {
              errString = parser.errorString();
              return false;
          }

          infoData = parser.infoSection();

          QMap<QByteArray, QVariant> dict = parser.dictionary();
          if (!dict.contains("info"))
              return false;

          QMap<QByteArray, QVariant> info = qvariant_cast<Dictionary>(dict.value("info"));

          if (info.contains("files")) {
              metaInfoFileForm = MultiFileForm;

              QList<QVariant> files = info.value("files").toList();

              for (int i = 0; i < files.size(); ++i) {
                  QMap<QByteArray, QVariant> file = qvariant_cast<Dictionary>(files.at(i));
                  QList<QVariant> pathElements = file.value("path").toList();
                  QByteArray path;
                  foreach (QVariant p, pathElements) {
                      if (!path.isEmpty())
                          path += '/';
                      path += p.toByteArray();
                  }

                  MetaInfoMultiFile multiFile;
                  multiFile.length = file.value("length").toLongLong();
                  multiFile.path = QString::fromUtf8(path);
                  multiFile.md5sum = file.value("md5sum").toByteArray();
                  metaInfoMultiFiles << multiFile;
              }

              metaInfoName = QString::fromUtf8(info.value("name").toByteArray());
              metaInfoPieceLength = info.value("piece length").toInt();
              QByteArray pieces = info.value("pieces").toByteArray();
              for (int i = 0; i < pieces.size(); i += 20)
                  metaInfoSha1Sums << pieces.mid(i, 20);
          } else if (info.contains("length")) {
              metaInfoFileForm = SingleFileForm;
              metaInfoSingleFile.length = info.value("length").toLongLong();
              metaInfoSingleFile.md5sum = info.value("md5sum").toByteArray();
              metaInfoSingleFile.name = QString::fromUtf8(info.value("name").toByteArray());
              metaInfoSingleFile.pieceLength = info.value("piece length").toInt();

              QByteArray pieces = info.value("pieces").toByteArray();
              for (int i = 0; i < pieces.size(); i += 20)
                  metaInfoSingleFile.sha1Sums << pieces.mid(i, 20);
          }

          metaInfoAnnounce = QString::fromUtf8(dict.value("announce").toByteArray());

          if (dict.contains("announce-list")) {
              // ### unimplemented
          }

          if (dict.contains("creation date"))
              metaInfoCreationDate.setTime_t(dict.value("creation date").toInt());
          if (dict.contains("comment"))
              metaInfoComment = QString::fromUtf8(dict.value("comment").toByteArray());
          if (dict.contains("created by"))
              metaInfoCreatedBy = QString::fromUtf8(dict.value("created by").toByteArray());

          return true;
      }

      QByteArray MetaInfo::infoValue() const
      {
          return infoData;
      }

      QString MetaInfo::errorString() const
      {
          return errString;
      }

      MetaInfo::FileForm MetaInfo::fileForm() const
      {
          return metaInfoFileForm;
      }

      QString MetaInfo::announceUrl() const
      {
          return metaInfoAnnounce;
      }

      QStringList MetaInfo::announceList() const
      {
          return metaInfoAnnounceList;
      }

      QDateTime MetaInfo::creationDate() const
      {
          return metaInfoCreationDate;
      }

      QString MetaInfo::comment() const
      {
          return metaInfoComment;
      }

      QString MetaInfo::createdBy() const
      {
          return metaInfoCreatedBy;
      }

      MetaInfoSingleFile MetaInfo::singleFile() const
      {
          return metaInfoSingleFile;
      }

      QList<MetaInfoMultiFile> MetaInfo::multiFiles() const
      {
          return metaInfoMultiFiles;
      }

      QString MetaInfo::name() const
      {
          return metaInfoName;
      }

      int MetaInfo::pieceLength() const
      {
          return metaInfoPieceLength;
      }

      QList<QByteArray> MetaInfo::sha1Sums() const
      {
          return metaInfoSha1Sums;
      }

      qint64 MetaInfo::totalSize() const
      {
          if (fileForm() == SingleFileForm)
              return singleFile().length;

          qint64 size = 0;
          foreach (MetaInfoMultiFile file, multiFiles())
              size += file.length;
          return size;
      }