#! /bin/sh /usr/share/dpatch/dpatch-run
## 06_fix_recursion_crash.dpatch by Brian Murray <[email protected]>
##
## All lines beginning with `## DP:' are a description of the patch.
## DP: Ubuntu: http://launchpad.net/bugs/344849
## DP: Patch: https://trac.mapnik.org/ticket/253
## DP: Description: Avoid a crash caused by an infinite recursion when drawing extremely long lines

@DPATCH@
diff -urNad agg-2.5+dfsg1~/include/agg_rasterizer_cells_aa.h agg-2.5+dfsg1/include/agg_rasterizer_cells_aa.h
--- agg-2.5+dfsg1~/include/agg_rasterizer_cells_aa.h	2007-10-10 15:06:16.000000000 -0700
+++ agg-2.5+dfsg1/include/agg_rasterizer_cells_aa.h	2009-04-02 18:34:07.000000000 -0700
@@ -333,6 +333,12 @@
         {
             int cx = (x1 + x2) >> 1;
             int cy = (y1 + y2) >> 1;
+
+            // Bail if values are so large they are likely to wrap
+            if ((abs(x1) >= INT_MAX/2) || (abs(y1) >= INT_MAX/2) ||
+                (abs(x2) >= INT_MAX/2) || (abs(y2) >= INT_MAX/2))
+                    return;
+
             line(x1, y1, cx, cy);
             line(cx, cy, x2, y2);
         }