package md5x

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

// 字符串的md5
func Md5String(value string) string {
	return Md5Byte([]byte(value))
}

func Md5Byte(b []byte) string {
	m := md5.New()
	m.Write(b)
	return hex.EncodeToString(m.Sum(nil))
}

// 文件的md5
func Md5File(path string) (string, error) {
	file, err := os.Open(path)
	if err != nil {
		return "", err
	}
	defer file.Close()

	return Md5Stream(file)
}

// 流式的md5
func Md5Stream(reader io.Reader) (string, error) {
	hash := md5.New()
	_, err := io.Copy(hash, reader)
	if err != nil {
		return "", err
	}
	return hex.EncodeToString(hash.Sum(nil)), nil
}