RMXP Table Class

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]].pack('S')
            end
         end
      end
      s
   end
   def self._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].unpack('S'))
         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
   attr_reader(:xsize, :ysize, :zsize, :data)
end