perf: sync protocol and core hardening updates

internal/compat/layerwire/routable_test.go

@@ -0,0 +1,43 @@
+package layerwire
+
+import (
+	"errors"
+	"testing"
+
+	"github.com/gotd/td/bin"
+	"github.com/gotd/td/tg"
+)
+
+func TestValidateRoutableRequestCompatibilityAndUnknown(t *testing.T) {
+	t.Run("legacy theme is fully walked", func(t *testing.T) {
+		var b bin.Buffer
+		b.PutID(0x8d9d742b)
+		b.PutString("android")
+		(&tg.InputThemeSlug{Slug: "night"}).Encode(&b)
+		b.PutLong(42)
+		known, err := ValidateRoutableRequest(b.Buf)
+		if err != nil || !known {
+			t.Fatalf("legacy theme known=%v err=%v, want true/nil", known, err)
+		}
+
+		b.Buf = b.Buf[:len(b.Buf)-4]
+		known, err = ValidateRoutableRequest(b.Buf)
+		if !known || !errors.Is(err, ErrMalformed) {
+			t.Fatalf("truncated legacy theme known=%v err=%v, want true/malformed", known, err)
+		}
+	})
+
+	t.Run("unknown stays opaque and bounded", func(t *testing.T) {
+		var b bin.Buffer
+		b.PutID(0x12345678)
+		b.PutUint32(0xffffffff)
+		known, err := ValidateRoutableRequest(b.Buf)
+		if err != nil || known {
+			t.Fatalf("opaque unknown known=%v err=%v, want false/nil", known, err)
+		}
+		known, err = ValidateRoutableRequest(append(b.Buf, 1))
+		if known || !errors.Is(err, ErrMalformed) {
+			t.Fatalf("unaligned unknown known=%v err=%v, want false/malformed", known, err)
+		}
+	})
+}