class Zip::ExtraField::OldUnix

def ==(other)
  @uid == other.uid &&
    @gid == other.gid &&
    @atime == other.atime &&
    @mtime == other.mtime
end

def initialize(binstr = nil)
  @uid = 0
  @gid = 0
  @atime = nil
  @mtime = nil
  binstr && merge(binstr)
end

def merge(binstr)
  return if binstr.empty?
  size, content = initial_parse(binstr)
  # size: 0 for central directory. 4 for local header
  return if !size || size == 0
  atime, mtime, uid, gid = content.unpack('VVvv')
  @uid ||= uid
  @gid ||= gid
  @atime ||= atime
  @mtime ||= mtime # rubocop:disable Naming/MemoizedInstanceVariableName
end

def pack_for_c_dir
  [@atime, @mtime].pack('VV')
end

def pack_for_local
  [@atime, @mtime, @uid, @gid].pack('VVvv')
end