Cache pieces info

PR #16238.

src/base/bittorrent/torrentimpl.cpp

@@ -44,7 +44,6 @@
 #include <libtorrent/info_hash.hpp>
 #endif
 
-#include <QBitArray>
 #include <QDebug>
 #include <QDir>
 #include <QFile>
@@ -1250,13 +1249,17 @@ QVector<PeerInfo> TorrentImpl::peers() const
 
 QBitArray TorrentImpl::pieces() const
 {
-    QBitArray result(m_nativeStatus.pieces.size());
+    if (m_pieces.isEmpty())
-    for (int i = 0; i < result.size(); ++i)
     {
-        if (m_nativeStatus.pieces[lt::piece_index_t {i}])
+        m_pieces.resize(m_nativeStatus.pieces.size());
-            result.setBit(i, true);
+        for (int i = 0; i < m_pieces.size(); ++i)
+        {
+            if (m_nativeStatus.pieces[lt::piece_index_t(i)])
+                m_pieces.setBit(i, true);
         }
-    return result;
+    }
+
+    return m_pieces;
 }
 
 QBitArray TorrentImpl::downloadingPieces() const
@@ -2094,6 +2097,7 @@ void TorrentImpl::updateStatus()
 
 void TorrentImpl::updateStatus(const lt::torrent_status &nativeStatus)
 {
+    m_pieces.clear();
     m_nativeStatus = nativeStatus;
     updateState();
 

src/base/bittorrent/torrentimpl.h

@@ -37,6 +37,7 @@
 #include <libtorrent/torrent_handle.hpp>
 #include <libtorrent/torrent_status.hpp>
 
+#include <QBitArray>
 #include <QDateTime>
 #include <QHash>
 #include <QMap>
@@ -320,5 +321,7 @@ namespace BitTorrent
         bool m_unchecked = false;
 
         lt::add_torrent_params m_ltAddTorrentParams;
+
+        mutable QBitArray m_pieces;
     };
 }