From 53e467db24310a09772cd71fb6616239e950dd72 Mon Sep 17 00:00:00 2001
From: Brian White <mscdex@mscdex.net>
Date: Tue, 6 Aug 2019 00:57:46 -0400
Subject: stream: improve read() performance more
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PR-URL: https://github.com/nodejs/node/pull/28989
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
---
 lib/internal/streams/buffer_list.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/lib/internal/streams/buffer_list.js b/lib/internal/streams/buffer_list.js
index 9dbf6f6769..36777ed82d 100644
--- a/lib/internal/streams/buffer_list.js
+++ b/lib/internal/streams/buffer_list.js
@@ -139,7 +139,10 @@ module.exports = class BufferList {
     while (p = p.next) {
       const buf = p.data;
       const nb = (n > buf.length ? buf.length : n);
-      buf.copy(ret, ret.length - n, 0, nb);
+      if (nb === buf.length)
+        ret.set(buf, ret.length - n);
+      else
+        ret.set(new Uint8Array(buf.buffer, buf.byteOffset, nb), ret.length - n);
       n -= nb;
       if (n === 0) {
         if (nb === buf.length) {
-- 
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