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

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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 = 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;
 }