A system, method and computer program product are provided for preventing the execution of unwanted code. To minimize the number of bits required for a residual block, quantized transform coefficients are adaptively divided into a plurality of subsets according to a size of a transform block, and non-zero quantized transform coefficients of each subset are scanned and encoded. A stationary feed chute is disposed adjacent a side of the conveyor for transferring the food items to the conveyor. The first door is pivotally connected to the vehicle body at an upper region of the door opening for partially enclosing an upper portion of the door opening.