class Table
   def initialize(x,y=1,z=1)
      @xsize,@ysize,@zsize=x,y,z
      @data=Array.new(x*y*z, 0)
   end
   def [](x,y=0,z=0)
      @data[x+y*@xsize+z*@xsize*@ysize]
   end
   def []=(*args)
      x=args[0]
      y=args.size>2 ?args[1]:0
      z=args.size>3 ?args[2]:0
      v=args.pop
      @data[x+y*@xsize+z*@xsize*@ysize]=v
   end
   def _dump(d=0)
      s=[3].pack('L')
      s+=[@xsize].pack('L')+[@ysize].pack('L')+[@zsize].pack('L')
      s+=[@xsize*@ysize*@zsize].pack('L')
      for z in 0...@zsize
         for y in 0...@ysize
            for x in 0...@xsize
               s+=[@data[x+y*@xsize+z*@xsize*@ysize],0,0].pack('L')[0,2]
            end
         end
      end
      s
   end
   attr_reader(:xsize,:ysize,:zsize,:data)
   class << self
      def _load(s)
         size=s[0,4].unpack('L')[0]
         nx=s[4,4].unpack('L')[0]
         ny=s[8,4].unpack('L')[0]
         nz=s[12,4].unpack('L')[0]
         data=[]
         pointer=20
         loop do
            data.push((s[pointer,2]+"\000\000").unpack('L')[0])
            pointer+=2
            break if pointer > s.size-1
         end
         t=Table.new(nx,ny,nz)
         n=0
         for z in 0...nz
            for y in 0...ny
               for x in 0...nx
                  t[x,y,z]=data[n]
                  n+=1
               end
            end
         end
         t
      end
   end
end