From 6a74449307c699172dc4c93e1a0e8ecfbaced675 Mon Sep 17 00:00:00 2001
From: Stefan Boberg <stefan@boberg.org>
Date: Wed, 12 May 2021 09:25:39 +0200
Subject: Added chunking to HttpSysServerRequest::ReadPayload to deal with
 large payloads better

---
 zencore/httpserver.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

(limited to 'zencore/httpserver.cpp')

diff --git a/zencore/httpserver.cpp b/zencore/httpserver.cpp
index 52389a11b..22cba4d75 100644
--- a/zencore/httpserver.cpp
+++ b/zencore/httpserver.cpp
@@ -1044,15 +1044,19 @@ public:
 
 		// Call http.sys API to receive the remaining data
 
+		static const uint64_t kMaxBytesPerApiCall = 1 * 1024 * 1024;
+
 		while (BytesToRead)
 		{
 			ULONG BytesRead = 0;
 
+			const uint64_t BytesToReadThisCall = zen::Min(BytesToRead, kMaxBytesPerApiCall);
+
 			ULONG ApiResult = HttpReceiveRequestEntityBody(m_HttpTx.RequestQueueHandle(),
 														   HttpReq->RequestId,
 														   0, /* Flags */
 														   ReadPointer,
-														   (ULONG)BytesToRead,
+														   gsl::narrow<ULONG>(BytesToReadThisCall),
 														   &BytesRead,
 														   NULL /* Overlapped */
 			);
-- 
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