stream: improve read() performance

PR-URL: #28961
Reviewed-By: Weijia Wang <starkwang@126.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Yongsheng Zhang <zyszys98@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

Author: mscdex

lib/internal/streams/buffer_list.js

@@ -3,10 +3,6 @@
 const { Buffer } = require('buffer');
 const { inspect } = require('internal/util/inspect');
 
-function copyBuffer(src, target, offset) {
-  Buffer.prototype.copy.call(src, target, offset);
-}
-
 module.exports = class BufferList {
   constructor() {
     this.head = null;
@@ -66,7 +62,7 @@ module.exports = class BufferList {
     var p = this.head;
     var i = 0;
     while (p) {
-      copyBuffer(p.data, ret, i);
+      ret.set(p.data, i);
       i += p.data.length;
       p = p.next;
     }