accept have messages without having metadata and without having received a bitfield

src/bt_peer_connection.cpp

@@ -1339,6 +1339,11 @@ namespace libtorrent
 			send_allowed_set();
 			return;
 		}
+		else if (t->num_pieces() == 0)
+		{
+			// don't send a bitfield if we don't have any pieces
+			return;
+		}
 	
 		int num_pieces = bitfield.size();
 		int lazy_pieces[50];

src/peer_connection.cpp

@@ -909,8 +909,26 @@ namespace libtorrent
 			<< " <== HAVE    [ piece: " << index << "]\n";
 #endif
 
+		if (!t->valid_metadata() && index > int(m_have_piece.size()))
+		{
+			if (index < 65536)
+			{
+				// if we don't have metadata
+				// and we might not have received a bitfield
+				// extend the bitmask to fit the new
+				// have message
+				m_have_piece.resize(index + 1, false);
+			}
+			else
+			{
+				// unless the index > 64k, in which case
+				// we just ignore it
+				return;
+			}
+		}
+
 		// if we got an invalid message, abort
-		if (index >= (int)m_have_piece.size() || index < 0)
+		if (index >= int(m_have_piece.size()) || index < 0)
 			throw protocol_error("got 'have'-message with higher index "
 				"than the number of pieces");