Add vendor (steam)

vendor/github.com/Philipp15b/go-steam/netutil/addr.go

@@ -0,0 +1,43 @@
+package netutil
+
+import (
+	"net"
+	"strconv"
+	"strings"
+)
+
+// An addr that is neither restricted to TCP nor UDP, but has an IP and a port.
+type PortAddr struct {
+	IP   net.IP
+	Port uint16
+}
+
+// Parses an IP address with a port, for example "209.197.29.196:27017".
+// If the given string is not valid, this function returns nil.
+func ParsePortAddr(addr string) *PortAddr {
+	parts := strings.Split(addr, ":")
+	if len(parts) != 2 {
+		return nil
+	}
+	ip := net.ParseIP(parts[0])
+	if ip == nil {
+		return nil
+	}
+	port, err := strconv.ParseUint(parts[1], 10, 16)
+	if err != nil {
+		return nil
+	}
+	return &PortAddr{ip, uint16(port)}
+}
+
+func (p *PortAddr) ToTCPAddr() *net.TCPAddr {
+	return &net.TCPAddr{p.IP, int(p.Port), ""}
+}
+
+func (p *PortAddr) ToUDPAddr() *net.UDPAddr {
+	return &net.UDPAddr{p.IP, int(p.Port), ""}
+}
+
+func (p *PortAddr) String() string {
+	return p.IP.String() + ":" + strconv.FormatUint(uint64(p.Port), 10)
+}