Fuzz btrfsitem, and by consequence improve binstruct errors

1 files changed, 16 insertions, 0 deletions

diff --git a/lib/binstruct/binutil/binutil.go b/lib/binstruct/binutil/binutil.go
new file mode 100644
index 0000000..684237f
--- /dev/null
+++ b/lib/binstruct/binutil/binutil.go
@@ -0,0 +1,16 @@
+// Copyright (C) 2022  Luke Shumaker <lukeshu@lukeshu.com>
+//
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+package binutil
+
+import (
+	"fmt"
+)
+
+func NeedNBytes(dat []byte, n int) error {
+	if len(dat) < n {
+		return fmt.Errorf("need at least %v bytes, only have %v", n, len(dat))
+	}
+	return nil
+}