From 61b4a984809ca078215902e3c5efda6384228ffd Mon Sep 17 00:00:00 2001
From: Antoine du Hamel <duhamelantoine1995@gmail.com>
Date: Fri, 23 Jul 2021 00:06:49 +0200
Subject: [PATCH] zlib: avoid converting `Uint8Array` instances to `Buffer`
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PR-URL: https://github.com/nodejs/node/pull/39492
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Zeyu Yang <himself65@outlook.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
---
 lib/zlib.js | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/lib/zlib.js b/lib/zlib.js
index daabf7b5ca7489..6fcf0b6e46ce9b 100644
--- a/lib/zlib.js
+++ b/lib/zlib.js
@@ -34,7 +34,6 @@ const {
   ObjectDefineProperties,
   ObjectDefineProperty,
   ObjectFreeze,
-  ObjectGetPrototypeOf,
   ObjectKeys,
   ObjectSetPrototypeOf,
   ReflectApply,
@@ -60,7 +59,8 @@ const {
 } = require('internal/util');
 const {
   isArrayBufferView,
-  isAnyArrayBuffer
+  isAnyArrayBuffer,
+  isUint8Array,
 } = require('internal/util/types');
 const binding = internalBinding('zlib');
 const assert = require('internal/assert');
@@ -109,10 +109,9 @@ for (const ckey of ObjectKeys(codes)) {
 function zlibBuffer(engine, buffer, callback) {
   if (typeof callback !== 'function')
     throw new ERR_INVALID_ARG_TYPE('callback', 'function', callback);
-  // Streams do not support non-Buffer ArrayBufferViews yet. Convert it to a
+  // Streams do not support non-Uint8Array ArrayBufferViews yet. Convert it to a
   // Buffer without copying.
-  if (isArrayBufferView(buffer) &&
-      ObjectGetPrototypeOf(buffer) !== Buffer.prototype) {
+  if (isArrayBufferView(buffer) && !isUint8Array(buffer)) {
     buffer = Buffer.from(buffer.buffer, buffer.byteOffset, buffer.byteLength);
   } else if (isAnyArrayBuffer(buffer)) {
     buffer = Buffer.from(buffer);