feat: Waku v2 bridge

Issue #12610

vendor/github.com/multiformats/go-multiaddr/varint.go

@@ -0,0 +1,27 @@
+package multiaddr
+
+import (
+	"math"
+
+	"github.com/multiformats/go-varint"
+)
+
+// CodeToVarint converts an integer to a varint-encoded []byte
+func CodeToVarint(num int) []byte {
+	if num < 0 || num > math.MaxInt32 {
+		panic("invalid code")
+	}
+	return varint.ToUvarint(uint64(num))
+}
+
+func ReadVarintCode(b []byte) (int, int, error) {
+	code, n, err := varint.FromUvarint(b)
+	if err != nil {
+		return 0, 0, err
+	}
+	if code > math.MaxInt32 {
+		// we only allow 32bit codes.
+		return 0, 0, varint.ErrOverflow
+	}
+	return int(code), n, err
+}