1 files changed, 31 insertions, 0 deletions
diff --git a/lib/diskio/file_os.go b/lib/diskio/file_os.go
new file mode 100644
index 0000000..2fa521d
--- /dev/null
+++ b/lib/diskio/file_os.go
@@ -0,0 +1,31 @@
+// Copyright (C) 2022  Luke Shumaker <lukeshu@lukeshu.com>
+//
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+package diskio
+
+import (
+	"os"
+)
+
+type OSFile[A ~int64] struct {
+	*os.File
+}
+
+var _ File[assertAddr] = (*OSFile[assertAddr])(nil)
+
+func (f *OSFile[A]) Size() A {
+	fi, err := f.Stat()
+	if err != nil {
+		return 0
+	}
+	return A(fi.Size())
+}
+
+func (f *OSFile[A]) ReadAt(dat []byte, paddr A) (int, error) {
+	return f.File.ReadAt(dat, int64(paddr))
+}
+
+func (f *OSFile[A]) WriteAt(dat []byte, paddr A) (int, error) {
+	return f.File.WriteAt(dat, int64(paddr))
+}