func (tc *TaskController) unzip(fileName string, dst string) (map[string][]string, int, error) {
	zf, err := zip.OpenReader(fileName)
	if err != nil {
		return nil, 0, err
	}
	defer zf.Close()
	total := 0 // 总文件数,记录任务进度
	files := make(map[string][]string) // 文件信息缓存,sku => 文件名
	for _, file := range zf.File {
		// 注意,windows 下的压缩文件是GBK,解压可能有中文名,则需要转换为 utf-8
		if file.Flags == 0 {
			i := bytes.NewReader([]byte(file.Name))
			decoder := transform.NewReader(i, simplifiedchinese.GB18030.NewDecoder())
			content, _ := ioutil.ReadAll(decoder)
			file.Name = string(content)
		}
		path := filepath.Join(dst, file.Name)
		if file.FileInfo().IsDir() {
			continue
		}
		f, err := file.Open()
		if err != nil {
			log.Error("[file.Open] error: %v", err)
			return nil, 0, err
		}
		if err = os.MkdirAll(filepath.Dir(path), os.ModePerm); err != nil {
			f.Close()
			return nil, 0, err
		}
		fw, err := os.OpenFile(path, os.O_CREATE|os.O_RDWR|os.O_TRUNC, file.Mode())
		if err != nil {
			log.Error("[os.OpenFile] error: %v", err)
			return nil, 0, err
		}
		_, err = io.Copy(fw, f)
		if err != nil {
			f.Close()
			fw.Close()
			return nil, 0, err
		}
		f.Close()
		fw.Close()
		sku := tc.getSku(file.Name)
		if sku == "" {
			continue
		}
		files[sku] = append(files[sku], file.Name)
		total += 1
	}
	return files, total, nil
}