metainfo.cpp Example File

  /****************************************************************************
  **
  ** Copyright (C) 2016 The Qt Company Ltd.
  ** Contact: https://www.qt.io/licensing/
  **
  ** This file is part of the examples of the Qt Toolkit.
  **
  ** $QT_BEGIN_LICENSE:BSD$
  ** Commercial License Usage
  ** Licensees holding valid commercial Qt licenses may use this file in
  ** accordance with the commercial license agreement provided with the
  ** Software or, alternatively, in accordance with the terms contained in
  ** a written agreement between you and The Qt Company. For licensing terms
  ** and conditions see https://www.qt.io/terms-conditions. For further
  ** information use the contact form at https://www.qt.io/contact-us.
  **
  ** BSD License Usage
  ** Alternatively, 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.
  **
  **
  ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
  **
  ** $QT_END_LICENSE$
  **
  ****************************************************************************/

  #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.setSecsSinceEpoch(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;
  }