// +build appengine// This file contains the safe implementations of otherwise unsafe-using code.packagexxhash// Sum64String computes the 64-bit xxHash digest of s.funcSum64String(sstring)uint64{returnSum64([]byte(s))}// WriteString adds more data to d. It always returns len(s), nil.func(d*Digest)WriteString(sstring)(nint,errerror){returnd.Write([]byte(s))}