From b445578604978ecf761880830cd64d0e138e85ca Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E9=99=88=E5=9B=BD=E4=BC=9F?= <366193849@qq.com>
Date: Wed, 19 Oct 2022 11:43:41 +0800
Subject: [PATCH] =?UTF-8?q?WriteReverse=E4=BC=98=E5=8C=96?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 WindivertDotnet/WindivertBufferWriter.cs | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/WindivertDotnet/WindivertBufferWriter.cs b/WindivertDotnet/WindivertBufferWriter.cs
index b4d2ce1..16c8c74 100644
--- a/WindivertDotnet/WindivertBufferWriter.cs
+++ b/WindivertDotnet/WindivertBufferWriter.cs
@@ -31,12 +31,13 @@ public WindivertBufferWriter(WinDivertPacket packet, int offset)
         public unsafe void WriteReverse<TValue>(TValue value) where TValue : unmanaged
         {
             var valueSpan = new Span<byte>(&value, sizeof(TValue));
-            Span<byte> reverseSpan = stackalloc byte[valueSpan.Length];
+            var span = this.GetSpan(valueSpan.Length);
 
-            valueSpan.CopyTo(reverseSpan);
-            reverseSpan.Reverse();
+            // 先写入后翻转，减少必要的分配
+            valueSpan.CopyTo(span);
+            span[..valueSpan.Length].Reverse();
 
-            this.Write(reverseSpan);
+            this.Advance(valueSpan.Length);
         }
 
         /// <summary>