package hash

import (
	"crypto/md5"
	"encoding/hex"
	"io"
	"os"
)

func FileMD5(fp string) (string, error) {
	f, err := os.OpenFile(fp, os.O_RDONLY, 0)
	if err != nil {
		return "", err
	}
	defer f.Close()

	hasher := md5.New()
	if _, err := io.Copy(hasher, f); err != nil {
		return "", err
	}
	sum := hasher.Sum(nil)
	return hex.EncodeToString(sum), nil
}