package algorithm

import (
	"crypto/md5"
	"fmt"
	"io"
	"os"
)

func FileNameToMd5(filename string) string {
	file, err := os.Open(filename)
	defer file.Close()
	if err != nil {
		return ""
	}
	return FileToMd5(file)
}

func FileToMd5Byte(src io.Reader) []byte {
	hash := md5.New()
	if _, err := io.Copy(hash, src); err != nil {
		return []byte{}
	}
	return hash.Sum(nil)
}

func FileToMd5(src io.Reader) string {
	has := FileToMd5Byte(src)
	return fmt.Sprintf("%x", has)
}

func StringToMd5(data string) string {
	has := md5.Sum([]byte(data))
	return fmt.Sprintf("%x", has)
}

func BytesToMd5(data []byte) string {
	has := md5.Sum(data)
	return fmt.Sprintf("%x", has)
}