package tools

import (
	"io"
	"os"

	"github.com/cespare/xxhash"
)

// exported functions
func XxHash(file string) (uint64, error) {
	filehandle, error := os.Open(file)
	if error != nil {
		return 0, error
	}
	defer filehandle.Close()
	hash := xxhash.New()
	_, error = io.Copy(hash, filehandle)
	if error != nil {
		return 0, error
	}
	return xxhash.Sum64(nil), nil
}