From e238632e57fc35d5da2902bc6b037e3a452447db Mon Sep 17 00:00:00 2001
From: Dustin Brody <tersec@users.noreply.github.com>
Date: Thu, 17 Mar 2022 07:39:39 +0000
Subject: [PATCH] don't even notionally access element 0 of 0-length openArray

---
 faststreams/inputs.nim | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/faststreams/inputs.nim b/faststreams/inputs.nim
index 5dc051b..ea78d8a 100644
--- a/faststreams/inputs.nim
+++ b/faststreams/inputs.nim
@@ -442,7 +442,11 @@ proc fileInput*(filename: string,
   return fileInput(file, offset, pageSize)
 
 proc unsafeMemoryInput*(mem: openArray[byte]): InputStreamHandle =
-  let head = unsafeAddr mem[0]
+  let head =
+    if mem.len > 0:
+      unsafeAddr mem[0]
+    else:
+      default(ptr byte)
 
   makeHandle InputStream(
     span: PageSpan(