extension_map.rb

class ArcFile

  include Enumerable

  def initialize( input_stream )
    @handle=input_stream
  end

  def each
    return self.to_enum unless block_given?
    begin
      # See http://www.archive.org/web/researcher/ArcFileFormat.php
      # for information about the ARC format once it is decompressed
      [email protected]
      [email protected]( Integer(main_header.split.last) )
      loop do
        begin
          [email protected]
          [email protected]( Integer(record_header.split.last) )
          unless ([email protected](1))=="\n"
            raise ArgumentError, "#{self.class}: Corrupt ARCfile? Expected \\n as record terminator, got #{byte}"
          end
          yield [record_header, record_body]
        rescue EOFError
          break nil
        end
      end
    rescue
      raise "#{self.class}: Error processing - #{$!}"
    end
  end

end