code: def parse_blockwise(value):
      
  
      length = byte_len(value)
      if length == 1:
          num = value & 0xF0
          num >>= 4
          m = value & 0x08
          m >>= 3
          size = value & 0x07
      elif length == 2:
          num = value & 0xFFF0
          num >>= 4
          m = value & 0x0008
          m >>= 3
          size = value & 0x0007
      else:
          num = value & 0xFFFFF0
          num >>= 4
          m = value & 0x000008
          m >>= 3
          size = value & 0x000007
      return num, int(m), pow(2, (size + 4))
docs: Parse Blockwise option.
  
      :param value: option value
      :return: num, m, size