class Rack::Multipart::Parser

def handle_mime_head
  if @sbuf.scan_until(@head_regex)
    head = @sbuf[1]
    content_type = head[MULTIPART_CONTENT_TYPE, 1]
    if name = head[MULTIPART_CONTENT_DISPOSITION, 1]
      name = dequote(name)
    else
      name = head[MULTIPART_CONTENT_ID, 1]
    end
    filename = get_filename(head)
    if name.nil? || name.empty?
      name = filename || "#{content_type || TEXT_PLAIN}[]".dup
    end
    @collector.on_mime_head @mime_index, head, filename, content_type, name
    @state = :MIME_BODY
  else
    :want_read
  end
end