golang版ip2long long2ip

2012-06-23 01:20  5023人阅读  评论 (0)
Tags: golanggo

其实也没什么难度的.写完放到这里分享下.

AddrToUint32

func AddrToUint32(addr net.Addr) (uint32, error) {
    var ip net.IP

    switch ipaddr := addr.(type) {
    case *net.IPAddr:
        ip = ipaddr.IP
    case *net.IPNet:
        ip = ipaddr.IP
    case *net.TCPAddr:
        ip = ipaddr.IP
    case *net.UDPAddr:
        ip = ipaddr.IP
    case *net.UnixAddr:
        return 0, errors.New("UnixAddr type not support")
    default:
        return 0, errors.New("addr type not support")
    }

    return binary.BigEndian.Uint32(ip.To4()), nil
}

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)
}
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