# File lib/innodb/log.rb, line 52
  def header
    offset = LOG_HEADER_BLOCK_MAP[:LOG_FILE_HEADER] * Innodb::LogBlock::BLOCK_SIZE
    @header ||= block_cursor(offset).name("header") do |c|
      {
        :group_id   => c.name("group_id")   { c.get_uint32 },
        :start_lsn  => c.name("start_lsn")  { c.get_uint64 },
        :file_no    => c.name("file_no")    { c.get_uint32 },
        :created_by => c.name("created_by") { c.get_string(32) }
      }
    end
  end