From 8854183fe565fafceb6b30149c1026401b60e4eb Mon Sep 17 00:00:00 2001
From: Calvin Metcalf <cmetcalf@appgeo.com>
Date: Fri, 9 Oct 2015 14:50:11 -0400
Subject: [PATCH] stream: avoid unnecessary concat of a single buffer.

Avoids doing a buffer.concat on the internal buffer
when that array has only a single thing in it.

Reviewed-By: Chris Dickinson <chris@neversaw.us>
Reviewed-By: James M Snell <jasnell@gmail.com>
PR-URL: https://github.com/nodejs/node/pull/3300
---
 lib/_stream_readable.js | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/_stream_readable.js b/lib/_stream_readable.js
index 5a375321615a7f..ab47830767c525 100644
--- a/lib/_stream_readable.js
+++ b/lib/_stream_readable.js
@@ -836,6 +836,8 @@ function fromList(n, state) {
     // read it all, truncate the array.
     if (stringMode)
       ret = list.join('');
+    else if (list.length === 1)
+      ret = list[0];
     else
       ret = Buffer.concat(list, length);
     list.length = 0;