feat(qs2) add qs2 framework

src/fs/fs_interface.go

@@ -0,0 +1,28 @@
+package fs
+
+import (
+	"io"
+	"os"
+)
+
+type ReadCloseSeeker interface {
+	io.Reader
+	io.ReaderFrom
+	io.Closer
+	io.Seeker
+}
+
+type ISimpleFS interface {
+	Create(path string) error
+	MkdirAll(path string) error
+	Remove(path string) error
+	Rename(oldpath, newpath string) error
+	ReadAt(path string, b []byte, off int64) (n int, err error)
+	WriteAt(path string, b []byte, off int64) (n int, err error)
+	Stat(path string) (os.FileInfo, error)
+	Close() error
+	Sync() error
+	GetFileReader(path string) (ReadCloseSeeker, error)
+	Root() string
+	ListDir(path string) ([]os.FileInfo, error)
+}