bool DeserializeExtraInfo (NavGraph graph) {
var zipIndex = graphIndexInZip[graph];
var entry = zip["graph"+zipIndex+"_extra"+binaryExt];
if (entry == null)
return false;
var reader = GetBinaryReader(entry);
var ctx = new GraphSerializationContext(reader, null, graph.graphIndex);
// Call the graph to process the data
graph.DeserializeExtraInfo(ctx);
return true;
}