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# metainfo.cpp Example File
network/torrent/metainfo.cpp

        /****************************************************************************
        **
        ** Copyright (C) 2004-2006 Trolltech AS. All rights reserved.
        **
        ** This file is part of the documentation of the Qt Toolkit.
        **
        ** This file may be used under the terms of the GNU General Public
        ** License version 2.0 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 GNU
        ** General Public Licensing requirements will be met:
        ** http://www.trolltech.com/products/qt/opensource.html
        **
        ** If you are unsure which license is appropriate for your use, please
        ** review the following information:
        ** http://www.trolltech.com/products/qt/licensing.html or contact the
        ** sales department at sales@trolltech.com.
        **
        ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
        ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        **
        ****************************************************************************/

        #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 = qVariantValue<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 = qVariantValue<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;
        }