chore: embed hysteria, clean irrelevant codes, code from https://github.com/HyNetwork/hysteria

transport/hysteria/utils/misc.go

@@ -0,0 +1,42 @@
+package utils
+
+import (
+	"net"
+	"strconv"
+)
+
+func SplitHostPort(hostport string) (string, uint16, error) {
+	host, port, err := net.SplitHostPort(hostport)
+	if err != nil {
+		return "", 0, err
+	}
+	portUint, err := strconv.ParseUint(port, 10, 16)
+	if err != nil {
+		return "", 0, err
+	}
+	return host, uint16(portUint), err
+}
+
+func ParseIPZone(s string) (net.IP, string) {
+	s, zone := splitHostZone(s)
+	return net.ParseIP(s), zone
+}
+
+func splitHostZone(s string) (host, zone string) {
+	if i := last(s, '%'); i > 0 {
+		host, zone = s[:i], s[i+1:]
+	} else {
+		host = s
+	}
+	return
+}
+
+func last(s string, b byte) int {
+	i := len(s)
+	for i--; i >= 0; i-- {
+		if s[i] == b {
+			break
+		}
+	}
+	return i
+}