From 845bc4a3cba18d108b20267dff1a87871ed31429 Mon Sep 17 00:00:00 2001
From: kenjis <kenji.uui@gmail.com>
Date: Thu, 27 Jan 2022 09:28:31 +0900
Subject: [PATCH 1/2] fix: DownloadResponse memory leak

---
 system/CodeIgniter.php | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/system/CodeIgniter.php b/system/CodeIgniter.php
index 3ff821585e6c..ecd051273c75 100644
--- a/system/CodeIgniter.php
+++ b/system/CodeIgniter.php
@@ -894,6 +894,11 @@ protected function gatherOutput(?Cache $cacheConfig = null, $returned = null)
         }
 
         if ($returned instanceof DownloadResponse) {
+            // Turn off output buffering completely, even if php.ini output_buffering is not off
+            while (ob_get_level() > 0) {
+                ob_end_clean();
+            }
+
             $this->response = $returned;
 
             return;

From 5106920fcde186d8f36fb3f556e9de7245e0e9d4 Mon Sep 17 00:00:00 2001
From: kenjis <kenji.uui@gmail.com>
Date: Thu, 27 Jan 2022 09:29:47 +0900
Subject: [PATCH 2/2] perf: reduce memory consumption

---
 system/HTTP/DownloadResponse.php | 1 +
 1 file changed, 1 insertion(+)

diff --git a/system/HTTP/DownloadResponse.php b/system/HTTP/DownloadResponse.php
index 8efb8b47a55a..abd666fbca52 100644
--- a/system/HTTP/DownloadResponse.php
+++ b/system/HTTP/DownloadResponse.php
@@ -306,6 +306,7 @@ private function sendBodyByFilePath()
         // Flush 1MB chunks of data
         while (! $splFileObject->eof() && ($data = $splFileObject->fread(1_048_576)) !== false) {
             echo $data;
+            unset($data);
         }
 
         return $this;