Add examples

Author: louisroyer

m-gtp4-ipv6-dst_test.go

@@ -19,5 +19,7 @@ func ExampleMGTP4IPv6Dst() {
 	); ok {
 		dst.AsAddr().AsSlice()
 		// ...
+		dst.IPv4()
+		dst.ArgsMobSession().PDUSessionID()
 	}
 }

m-gtp4-ipv6-src-nextmn_test.go

@@ -23,6 +23,12 @@ func ExampleMGTP4IPv6SrcNextMN() {
 	); ok {
 		src.AsAddr().AsSlice()
 		// ...
+		if fields, err := rfc9433.ParseMGTP4IPv6SrcNextMN(src.AsAddr().As16()); err != nil {
+			panic(err)
+		} else {
+			fields.IPv4()
+			fields.UDPPortNumber()
+		}
 	}
 }
 

m-gtp4-ipv6-src_test.go

@@ -0,0 +1,63 @@
+// Copyright Louis Royer and the NextMN contributors. All rights reserved.
+// Use of this source code is governed by a MIT-style license that can be
+// found in the LICENSE file.
+// SPDX-License-Identifier: MIT
+
+package rfc9433_test
+
+import (
+	"fmt"
+	"net/netip"
+	"testing"
+
+	"github.com/nextmn/rfc9433"
+
+	"github.com/google/go-cmp/cmp"
+)
+
+func ExampleMGTP4IPv6Src() {
+	if src, ok := rfc9433.MGTP4IPv6SrcFrom(
+		netip.MustParsePrefix("3fff::/20"),
+		netip.MustParseAddr("203.0.113.1").As4(),
+	); ok {
+		src.AsAddr().AsSlice()
+		// ...
+		if fields, err := rfc9433.ParseMGTP4IPv6Src(src.AsAddr().As16(), 20); err != nil {
+			panic(err)
+		} else {
+			fields.IPv4()
+		}
+	}
+}
+
+func TestMGTP4IPv6Src(t *testing.T) {
+	ip_addr := [16]byte{
+		0x20, 0x01, 0xDB, 0x08,
+		192, 0, 2, 1,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	}
+
+	e, err := rfc9433.ParseMGTP4IPv6Src(ip_addr, 32)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if e.IPv4().Compare(netip.MustParseAddr("192.0.2.1")) != 0 {
+		t.Fatalf("Cannot extract ipv4 correctly: %s", e.IPv4())
+	}
+	ip_addr2, ok := rfc9433.MGTP4IPv6SrcFrom(netip.MustParsePrefix("fd00:1:1::/48"), [4]byte{10, 0, 4, 1})
+	if !ok {
+		t.Fatal("Could not create MGTP4IPv6Src")
+	}
+	b := ip_addr2.AsAddr().As16()
+	res2 := [16]byte{
+		0xfd, 0x00, 0x00, 0x01, 0x00, 0x01,
+		10, 0, 4, 1,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	}
+	fmt.Println(b)
+	fmt.Println(res2)
+	if diff := cmp.Diff(b, res2); diff != "" {
+		t.Error(diff)
+	}
+
+}