return gracefully instead of failing of geometry is only a single node

Project-OSRM · May 12, 2014 · a6bfec2 · a6bfec2
1 parent 07231d3
commit a6bfec2
Showing 1 changed file with 6 additions and 1 deletion.
diff --git a/Algorithms/DouglasPeucker.cpp b/Algorithms/DouglasPeucker.cpp
@@ -62,9 +62,14 @@ DouglasPeucker::DouglasPeucker()
 
 void DouglasPeucker::Run(std::vector<SegmentInformation> &input_geometry, const unsigned zoom_level)
 {
+ BOOST_ASSERT_MSG(!input_geometry.empty(), "geometry invalid");
+ if (input_geometry.size() <= 2)
+ {
+ return;
+ }
+
  {
  BOOST_ASSERT_MSG(zoom_level < 19, "unsupported zoom level");
- BOOST_ASSERT_MSG(1 < input_geometry.size(), "geometry invalid");
  unsigned left_border = 0;
  unsigned right_border = 1;
  // Sweep over array and identify those ranges that need to be checked