# File lib/innodb/log_block.rb, line 94
  def calculate_checksum
    cksum = 1
    shift = (0..24).cycle
    cursor(0).each_byte_as_uint8(TRAILER_OFFSET) do |b|
      cksum &= 0x7fffffff
      cksum += b + (b << shift.next)
    end
    cksum
  end