Go语言版的ip2long和long2ip

Go语言版的ip2long long2ip

ip2long

func Ip2long(ipstr string) (ip uint32) {
    r := `^(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})`
    reg, err := regexp.Compile(r)
    if err != nil {
        return
    }
    ips := reg.FindStringSubmatch(ipstr)
    if ips == nil {
        return
    } 
      
    ip1, _ := strconv.Atoi(ips[1])
    ip2, _ := strconv.Atoi(ips[2])
    ip3, _ := strconv.Atoi(ips[3])
    ip4, _ := strconv.Atoi(ips[4])
      
    if ip1>255 || ip2>255 || ip3>255 || ip4 > 255 {
        return
    }
      
    ip += uint32(ip1 * 0x1000000)
    ip += uint32(ip2 * 0x10000)
    ip += uint32(ip3 * 0x100)
    ip += uint32(ip4)
      
    return
}

long2ip

func Long2ip(ip uint32) string {
    return fmt.Sprintf("%d.%d.%d.%d", ip>>24, ip<<8>>24, ip<<16>>24, ip<<24>>24)
}