functions for retrieving list of currently downloading files

src/base/bittorrent/peerinfo.cpp

@@ -408,3 +408,8 @@ QString PeerInfo::flagsDescription() const
 {
     return m_flagsDescription;
 }
+
+int PeerInfo::downloadingPieceIndex() const
+{
+    return m_nativeInfo.downloading_piece_index;
+}

src/base/bittorrent/peerinfo.h

@@ -100,6 +100,7 @@ namespace BitTorrent
 #ifndef DISABLE_COUNTRIES_RESOLUTION
         QString country() const;
 #endif
+        int downloadingPieceIndex() const;
 
     private:
         void calcRelevance(const TorrentHandle *torrent);

src/base/bittorrent/torrentinfo.cpp

@@ -211,6 +211,20 @@ QByteArray TorrentInfo::metadata() const
     return QByteArray(m_nativeInfo->metadata().get(), m_nativeInfo->metadata_size());
 }
 
+QStringList TorrentInfo::filesForPiece(int pieceIndex) const
+{
+    if (pieceIndex < 0)
+        return QStringList();
+
+    std::vector<libtorrent::file_slice> files(
+        nativeInfo()->map_block(pieceIndex, 0, nativeInfo()->piece_length()));
+    QStringList res;
+    for (const libtorrent::file_slice& s: files) {
+        res.append(filePath(s.file_index));
+    }
+    return res;
+}
+
 void TorrentInfo::renameFile(uint index, const QString &newPath)
 {
     if (!isValid()) return;

src/base/bittorrent/torrentinfo.h

@@ -75,6 +75,7 @@ namespace BitTorrent
         QList<TrackerEntry> trackers() const;
         QList<QUrl> urlSeeds() const;
         QByteArray metadata() const;
+        QStringList filesForPiece(int pieceIndex) const;
 
         void renameFile(uint index, const QString &newPath);
         boost::intrusive_ptr<libtorrent::torrent_info> nativeInfo() const;