class Zip::ExtraField::Zip64

def initialize(binstr = nil)
  # unparsed binary; we don't actually know what this contains
  # without looking for FFs in the associated file header
  # call parse after initializing with a binary string
  @content                = nil
  @original_size          = nil
  @compressed_size        = nil
  @relative_header_offset = nil
  @disk_start_number      = nil
  binstr && merge(binstr)
end