added bit checking in swf_ShapeSetCurve().

[swftools.git] / lib / modules / swfshape.c

diff --git a/lib/modules/swfshape.c b/lib/modules/swfshape.c
index 30c57d8..850bead 100644 (file)
--- a/lib/modules/swfshape.c
+++ b/lib/modules/swfshape.c
@@ -470,6 +470,11 @@ int swf_ShapeSetCurve(TAG * t,SHAPE * s,S32 x,S32 y,S32 ax,S32 ay)
   b = swf_CountBits(x,b);
   b = swf_CountBits(y,b);
 
+  if(b-2 >= 16) {
+       fprintf(stderr, "Bit overflow in swf_ShapeSetCurve- %d (%d,%d,%d,%d)\n", b, ax,ay,x,y);
+       b = 17;
+  }
+
   swf_SetBits(t,b-2,4);
   swf_SetBits(t,x,b);
   swf_SetBits(t,y,b);