image-zoom.c: add the xsize and ysize check to zero in _cupsImageZoomNew #629
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When calculating z->xmod, z->xstep, etc., if xsize and ysize are zero, division by zero occurs. To avoid this, the xsize and ysize check for zero is added at the beginning of the function.
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When calculating z->xmod, z->xstep, etc., if xsize and ysize are zero, division by zero occurs. To avoid this, the xsize and ysize check for zero is added at the beginning of the function.