- Qt 5.5
- Qt Network
- Torrent Example
- metainfo.cpp Example File
- Qt 5.5.1 Reference Documentation

# metainfo.cpp Example File

torrent/metainfo.cpp

    /****************************************************************************
    **
    ** 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.
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    **     contributors may be used to endorse or promote products derived
    **     from this software without specific prior written permission.
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    ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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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;
    }