From 8d3fc3533bad74f3cf5bd87ae9b45b98bdf05554 Mon Sep 17 00:00:00 2001
From: Dan Baumberger <dbaumberger@cylance.com>
Date: Fri, 19 May 2017 08:36:11 -0700
Subject: [PATCH] Issue #230: preserve the compression method when getting a
 compressed stream for encrypted ZIP archives.

---
 src/SharpCompress/Archives/Zip/ZipArchiveEntry.cs | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/SharpCompress/Archives/Zip/ZipArchiveEntry.cs b/src/SharpCompress/Archives/Zip/ZipArchiveEntry.cs
index 2f1f80f2..64fc8427 100644
--- a/src/SharpCompress/Archives/Zip/ZipArchiveEntry.cs
+++ b/src/SharpCompress/Archives/Zip/ZipArchiveEntry.cs
@@ -14,7 +14,15 @@ namespace SharpCompress.Archives.Zip
 
         public virtual Stream OpenEntryStream()
         {
-            return Parts.Single().GetCompressedStream();
+            var filePart = Parts.Single() as ZipFilePart;
+            var compressionMethod = filePart.Header.CompressionMethod;
+            var stream = filePart.GetCompressedStream();
+            if (filePart.Header.CompressionMethod != compressionMethod)
+            {
+                filePart.Header.CompressionMethod = compressionMethod;
+            }
+            
+            return stream; 
         }
 
         #region IArchiveEntry Members