def getRequest
      m = Request.new
      m.pieceIndex = @pieceIndex
      m.blockOffset = @offset
      m.blockLength = @length
      m
    end
def getRequest
      m = Request.new
      m.pieceIndex = @pieceIndex
      m.blockOffset = @offset
      m.blockLength = @length
      m
    end
Return a new Bittorrent Request message that requests this block.