[osg-submissions] osgPlugins/shp

[Sebastian Messerschmidt]

Hi,

attached you'll find a patch for the shp-plugin.
I've spotted huge memory leaks int ShapeParser and fixed them.
Also, there was a missing destructor (PolygonM) and a missing member 
initialization (PolygonZ)
Would be nice if someone could test the changes.

To release the memory just if no reading error happened (and therefore 
the arrays would be valid) I've added an macro to release and reset the 
pointers at once. I'm not using macros myself very often as I don't like 
them, but I think it doesn't hurt in this code.



Best regards
Sebastian
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