# File tar.rb, line 296
296:     def initialize( file )
297:       @file = file
298:       @header = RecordHeader.from_stream( @file )
299:       @position = @file.pos
300:       @real_size = @header.size
301:       
302:       @real_size += RecordHeader.padding( @header.size )
303: 
304:       file.pos += @real_size
305:     end