disk

type Disk interface {
	Exists(path string) error
	Read(path string) ([]byte, error)
	Write(path string, data []byte) error
	Remove(path string) error
	MkDir(path string) error
	ReadDir(path string) ([]Entry, error)
	IsNotExist(err error) bool
	IsExist(err error) bool
	Open(path string, flag int) (io.WriteCloser, error)
}

type Entry interface {
	IsDir() bool
	Name() string
}