From 07dbf569dfe72876da82acf85fe58f917f84662e Mon Sep 17 00:00:00 2001
From: lukechampine <luke.champine@gmail.com>
Date: Fri, 24 Jan 2020 12:03:37 -0500
Subject: [PATCH] handle empty slice case before bounds-check

---
 xor.go | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/xor.go b/xor.go
index 680d425..cda571a 100644
--- a/xor.go
+++ b/xor.go
@@ -12,6 +12,9 @@ func Bytes(dst, a, b []byte) int {
 	if len(dst) < n {
 		n = len(dst)
 	}
+	if n == 0 {
+		return n
+	}
 	_ = dst[n-1]
 	_ = a[n-1]
 	_ = b[n-1]
@@ -29,6 +32,9 @@ func Byte(dst, a []byte, b byte) int {
 	if len(dst) < n {
 		n = len(dst)
 	}
+	if n == 0 {
+		return n
+	}
 	_ = dst[n-1]
 	_ = a[n-1]
 	for i := 0; i < n; i++ {