From 014bbc3ea480e7cdcf07b0842c398ca42b49952e Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Tue, 27 Jan 2026 11:47:52 +0000
Subject: [PATCH 1/3] Initial plan


From 53f12d75db91be1d1c38773cea93a516c18e916b Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Tue, 27 Jan 2026 11:53:37 +0000
Subject: [PATCH 2/3] Add [Obsolete] attribute to
 ReaderOptions.DefaultBufferSize

Co-authored-by: adamhathcock <527620+adamhathcock@users.noreply.github.com>
---
 src/SharpCompress/Readers/ReaderOptions.cs | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/SharpCompress/Readers/ReaderOptions.cs b/src/SharpCompress/Readers/ReaderOptions.cs
index 49a91e93..6998ba9c 100644
--- a/src/SharpCompress/Readers/ReaderOptions.cs
+++ b/src/SharpCompress/Readers/ReaderOptions.cs
@@ -5,6 +5,14 @@ namespace SharpCompress.Readers;
 
 public class ReaderOptions : OptionsBase
 {
+    /// <summary>
+    /// The default buffer size for stream operations.
+    /// </summary>
+    [Obsolete(
+        "Use Constants.BufferSize instead. This constant will be removed in a future version."
+    )]
+    public const int DefaultBufferSize = 0x10000;
+
     /// <summary>
     /// Look for RarArchive (Check for self-extracting archives or cases where RarArchive isn't at the start of the file)
     /// </summary>

From 010a38bb7369ccb646479dd638262a2082522575 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Tue, 27 Jan 2026 11:54:50 +0000
Subject: [PATCH 3/3] Add clarifying comment about buffer size value difference

Co-authored-by: adamhathcock <527620+adamhathcock@users.noreply.github.com>
---
 src/SharpCompress/Readers/ReaderOptions.cs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/SharpCompress/Readers/ReaderOptions.cs b/src/SharpCompress/Readers/ReaderOptions.cs
index 6998ba9c..b016a3b6 100644
--- a/src/SharpCompress/Readers/ReaderOptions.cs
+++ b/src/SharpCompress/Readers/ReaderOptions.cs
@@ -7,6 +7,8 @@ public class ReaderOptions : OptionsBase
 {
     /// <summary>
     /// The default buffer size for stream operations.
+    /// This value (65536 bytes) is preserved for backward compatibility.
+    /// New code should use Constants.BufferSize instead (81920 bytes), which matches .NET's Stream.CopyTo default.
     /// </summary>
     [Obsolete(
         "Use Constants.BufferSize instead. This constant will be removed in a future version."