Method CheckAndAddSource

src/DownloadQueue.cpp:623–717

void CDownloadQueue::CheckAndAddSource(CPartFile* sender, CUpDownClient* source)
{
	// if we block loopbacks at this point it should prevent us from connecting to ourself
	if ( source->HasValidHash() ) {
		if ( source->GetUserHash() == thePrefs::GetUserHash() ) {
			AddDebugLogLineN( logDownloadQueue, "Tried to add source with matching hash to your own." );
			source->Safe_Delete();
			return;
		}
	}

	if (sender->IsStopped()) {
		source->Safe_Delete();
		return;
	}

	// Filter sources which are known to be dead/useless
	if ( theApp->clientlist->IsDeadSource( source ) || sender->IsDeadSource(source) ) {
		source->Safe_Delete();
		return;
	}

	// Filter sources which are incompatible with our encryption setting (one requires it, and the other one doesn't supports it)
	if ( (source->RequiresCryptLayer() && (!thePrefs::IsClientCryptLayerSupported() || !source->HasValidHash())) || (thePrefs::IsClientCryptLayerRequired() && (!source->SupportsCryptLayer() || !source->HasValidHash()))) {
		source->Safe_Delete();
		return;
	}

	// Find all clients with the same hash
	if ( source->HasValidHash() ) {
		CClientList::SourceList found = theApp->clientlist->GetClientsByHash( source->GetUserHash() );

		CClientList::SourceList::iterator it = found.begin();
		for ( ; it != found.end(); ++it ) {
			CKnownFile* file = it->GetRequestFile();

			// Only check files on the download-queue
			if ( file ) {
				// Is the found source queued for something else?
				if (  file != sender ) {
					// Try to add a request for the other file
					if ( it->GetClient()->AddRequestForAnotherFile(sender)) {
						// Add it to downloadlistctrl
						Notify_SourceCtrlAddSource(sender, *it, A4AF_SOURCE);
					}
				}

				source->Safe_Delete();
				return;
			}
		}
	}



	// Our new source is real new but maybe it is already uploading to us?
	// If yes the known client will be attached to the var "source" and the old
	// source-client will be deleted. However, if the request file of the known