Optimize converter between QString and sha1_hash

src/misc.h

@@ -73,13 +73,9 @@ public:
   }
 
   static inline QString toQString(const libtorrent::sha1_hash &hash) {
-    std::ostringstream o;
-    o << hash;
-    return QString(o.str().c_str());
-  }
-
-  static inline libtorrent::sha1_hash toSha1Hash(const QString &hash) {
-    return libtorrent::sha1_hash(hash.toAscii().constData());
+    char out[41];
+    to_hex((char const*)&hash[0], libtorrent::sha1_hash::size, out);
+    return QString(out);
   }
 
   static void chmod644(const QDir& folder);

src/qtlibtorrent/qbtsession.cpp

@@ -909,7 +909,7 @@ QTorrentHandle QBtSession::addMagnetUri(QString magnet_uri, bool resumed) {
   Q_ASSERT(magnet_uri.startsWith("magnet:", Qt::CaseInsensitive));
 
   // Check for duplicate torrent
-  if(s->find_torrent(misc::toSha1Hash(hash)).is_valid()) {
+  if(s->find_torrent(QStringToSha1(hash)).is_valid()) {
     qDebug("/!\\ Torrent is already in download list");
     addConsoleMessage(tr("'%1' is already in download list.", "e.g: 'xxx.avi' is already in download list.").arg(magnet_uri));
     return h;