You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: rand.go
    path of file: ./repos/corteza/server/vendor/google.golang.org/protobuf/internal/detrand
    
    the code of the file until where you have to start completion: // Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Package detrand provides deterministically random functionality.
//
// The pseudo-randomness of these functions is seeded by the program binary
// itself and guarantees that the ou
    
func binaryHash() uint64 {
	// Open the Go binary.
	s, err := os.Executable()
	if err != nil {
		return 0
	}
	f, err := os.Open(s)
	if err != nil {
		return 0
	}
	defer f.Close()

	// Hash the size and several samples of the Go binary.
	const numSamples = 8
	var buf [64]byte
	h := fnv.New64()
	fi, err := f.Stat()
	if err != nil {
		return 0
	}
	binary.LittleEndian.PutUint64(buf[:8], uint64(fi.Size()))
	h.Write(buf[:8])
	for i := int64(0); i < numSamples; i++ {
		if _, err := f.ReadAt(buf[:], i*fi.Size()/numSamples); err != nil {
			return 0
		}
		h.Write(buf[:])
	}
	return h.Sum64()
}