+(defun gen-buffer (&key (length (gen-integer :min 0 :max 50))
+ (element-type '(unsigned-byte 8))
+ (elements (gen-integer :min 0 :max (1- (expt 2 8)))))
+ (lambda ()
+ (let ((buffer (make-array (funcall length) :element-type element-type)))
+ (map-into buffer elements))))
+
+(defun gen-one-element (&rest elements)
+ (lambda ()
+ (nth (random (length elements)) elements)))
+