Some questions about source code

[FTwOoO]

After reading the source code of gohop, i have 2 questions about the implementation that i don't understand, could u explain it?

1. What does the 'rate' mean in hopPacketBuffer:Pop(), to delay the pop operation? What does the algorithm means?

   func (hb *hopPacketBuffer) Pop() *HopPacket {
   <-hb.newPack
   r := int(hb.rate & 0x10)
   if hb.buf.count < 8+r {
       time.Sleep(time.Duration(r*20+50) * time.Microsecond)
       hb.rate = hb.rate >> 1
   }
   p := hb.buf.Pop().(*HopPacket)
   return p
   }
   

2. For the PKCS5UnPadding method, if there's no padding, this method will still get the last byte as padding length, is it wrong ?

   func PKCS5UnPadding(origData []byte) []byte {
   length := len(origData)
   unpadding := int(origData[length-1])
   return origData[:(length - unpadding)]
   }
   

3. If one of the port between [HopStart, HopEnd] is blocked, the client knowns nothing about that, and still trying to forward packets to the port blocked (because of handshake succed on another port), without retrying and port switching ?