Unzip multipart zipfile and return a slice [file_name]file_content

UnzipMultipartFile.go

func UnzipMultipartFile(f *multipart.FileHeader) (map[string]*bytes.Buffer, error) {
	file, err := f.Open()
	if err != nil {
		return nil, err
	}
	defer file.Close()
	size, err := file.Seek(0, 2)
	if err != nil {
		return nil, err
	}
	r, err := zip.NewReader(file, size)
	if err != nil {
		return nil, err
	}
	files := make(map[string]*bytes.Buffer, len(r.File))
	for _, f := range r.File {
		rc, err := f.Open()
		if err != nil {
			return nil, err
		}
		files[f.Name] = new(bytes.Buffer)
		_, err = io.Copy(files[f.Name], rc)
		if err != nil {
			return nil, err
		}
		rc.Close()
	}
	return files, nil
}