class Rack::Multipart::Parser

def handle_mime_body
  if (body_with_boundary = @sbuf.check_until(@body_regex)) # check but do not advance the pointer yet
    body = body_with_boundary.sub(@body_regex_at_end, '') # remove the boundary from the string
    @collector.on_mime_body @mime_index, body
    @sbuf.pos += body.length + 2 # skip \r\n after the content
    @state = :CONSUME_TOKEN
    @mime_index += 1
  else
    # Save what we have so far
    if @rx_max_size < @sbuf.rest_size
      delta = @sbuf.rest_size - @rx_max_size
      @collector.on_mime_body @mime_index, @sbuf.peek(delta)
      @sbuf.pos += delta
      @sbuf.string = @sbuf.rest
    end
    :want_read
  end
end