1 files changed, 24 insertions, 0 deletions
diff --git a/lib/diskio/file_iface.go b/lib/diskio/file_iface.go
new file mode 100644
index 0000000..206db0c
--- /dev/null
+++ b/lib/diskio/file_iface.go
@@ -0,0 +1,24 @@
+// Copyright (C) 2022  Luke Shumaker <lukeshu@lukeshu.com>
+//
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+package diskio
+
+import (
+	"io"
+)
+
+type File[A ~int64] interface {
+	Name() string
+	Size() A
+	Close() error
+	ReadAt(p []byte, off A) (n int, err error)
+	WriteAt(p []byte, off A) (n int, err error)
+}
+
+type assertAddr int64
+
+var (
+	_ io.WriterAt = File[int64](nil)
+	_ io.ReaderAt = File[int64](nil)
+)