From 75a6db8f4c025c1d62bf03ea79f3d893ac711a45 Mon Sep 17 00:00:00 2001
From: Jason Nelson <jason@carbonmade.com>
Date: Fri, 31 Jul 2020 16:33:00 -0700
Subject: [PATCH] Eliminate three allocations in HbMakeCodeLengths

---
 src/SharpCompress/Compressors/BZip2/CBZip2OutputStream.cs | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/SharpCompress/Compressors/BZip2/CBZip2OutputStream.cs b/src/SharpCompress/Compressors/BZip2/CBZip2OutputStream.cs
index 01d3af4c..a0e9705a 100644
--- a/src/SharpCompress/Compressors/BZip2/CBZip2OutputStream.cs
+++ b/src/SharpCompress/Compressors/BZip2/CBZip2OutputStream.cs
@@ -89,9 +89,9 @@ namespace SharpCompress.Compressors.BZip2
             int nNodes, nHeap, n1, n2, i, j, k;
             bool tooLong;
 
-            int[] heap = new int[BZip2Constants.MAX_ALPHA_SIZE + 2];
-            int[] weight = new int[BZip2Constants.MAX_ALPHA_SIZE * 2];
-            int[] parent = new int[BZip2Constants.MAX_ALPHA_SIZE * 2];
+            Span<int> heap = stackalloc int[BZip2Constants.MAX_ALPHA_SIZE + 2]; // 1040 bytes
+            Span<int> weight = stackalloc int[BZip2Constants.MAX_ALPHA_SIZE * 2];  // 1040 bytes
+            Span<int> parent = stackalloc int[BZip2Constants.MAX_ALPHA_SIZE * 2];  // 1040 bytes
 
             for (i = 0; i < alphaSize; i++)
             {