From db9daa98a5dedc3ebefea3fe7c09a3fb505fa366 Mon Sep 17 00:00:00 2001
From: Samuel Mannehed <samuel@cendio.se>
Date: Thu, 14 Jun 2018 16:52:36 +0200
Subject: [PATCH] Avoid big strings on the stack

Previous code resulted in RangeErrors by potentially creating big
strings.

Fixes issue #1065
---
 core/websock.js | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/core/websock.js b/core/websock.js
index 9291d4ed..6b033615 100644
--- a/core/websock.js
+++ b/core/websock.js
@@ -101,7 +101,13 @@ Websock.prototype = {
     rQshiftStr: function (len) {
         if (typeof(len) === 'undefined') { len = this.rQlen(); }
         const arr = this.rQshiftBytes(len);
-        return String.fromCharCode.apply(null, arr);
+        let str = "";
+        // Handle large arrays in steps to avoid long strings on the stack
+        for (let i = 0; i < len; i += 4096) {
+            let part = arr.slice(i, i + Math.min(4096, len));
+            str = str.concat(String.fromCharCode.apply(null, part));
+        }
+        return str;
     },
 
     rQshiftBytes: function (len) {