From 364d0d724d44eef8049ccd8e715b3f94b8edabf9 Mon Sep 17 00:00:00 2001
From: Michael Lund <michael.lund@3shape.com>
Date: Thu, 3 Oct 2019 14:08:32 +0200
Subject: [PATCH] Pause building of modified collection

---
 .../Archives/AbstractWritableArchive.cs           | 15 ++++++++++++++-
 src/SharpCompress/Archives/IWritableArchive.cs    |  4 ++++
 .../Archives/IWritableArchiveExtensions.cs        |  3 +++
 3 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/src/SharpCompress/Archives/AbstractWritableArchive.cs b/src/SharpCompress/Archives/AbstractWritableArchive.cs
index 5f38d459e..3b24f299c 100644
--- a/src/SharpCompress/Archives/AbstractWritableArchive.cs
+++ b/src/SharpCompress/Archives/AbstractWritableArchive.cs
@@ -17,6 +17,7 @@ public abstract class AbstractWritableArchive<TEntry, TVolume> : AbstractArchive
 
         private readonly List<TEntry> modifiedEntries = new List<TEntry>();
         private bool hasModifications;
+        private bool shouldRebuildModifiedCollection = true;
 
         internal AbstractWritableArchive(ArchiveType type)
             : base(type)
@@ -96,10 +97,22 @@ IArchiveEntry IWritableArchive.AddEntry(string key, Stream source, bool closeStr
             }
             var entry = CreateEntry(key, source, size, modified, closeStream);
             newEntries.Add(entry);
-            RebuildModifiedCollection();
+            if(shouldRebuildModifiedCollection)
+                RebuildModifiedCollection();
             return entry;
         }
 
+        public void PauseInternalEntryUpdates()
+        {
+            shouldRebuildModifiedCollection = false;
+        }
+
+        public void ResumeInternalEntryUpdates()
+        {
+            shouldRebuildModifiedCollection = true;
+            RebuildModifiedCollection();
+        }
+
         private bool DoesKeyMatchExisting(string key)
         {
             foreach (var path in Entries.Select(x => x.Key))
diff --git a/src/SharpCompress/Archives/IWritableArchive.cs b/src/SharpCompress/Archives/IWritableArchive.cs
index 380d68148..dc127a9fe 100644
--- a/src/SharpCompress/Archives/IWritableArchive.cs
+++ b/src/SharpCompress/Archives/IWritableArchive.cs
@@ -11,5 +11,9 @@ public interface IWritableArchive : IArchive
         IArchiveEntry AddEntry(string key, Stream source, bool closeStream, long size = 0, DateTime? modified = null);
 
         void SaveTo(Stream stream, WriterOptions options);
+
+        void PauseInternalEntryUpdates();
+
+        void ResumeInternalEntryUpdates();
     }
 }
\ No newline at end of file
diff --git a/src/SharpCompress/Archives/IWritableArchiveExtensions.cs b/src/SharpCompress/Archives/IWritableArchiveExtensions.cs
index bee42a499..7ea341025 100644
--- a/src/SharpCompress/Archives/IWritableArchiveExtensions.cs
+++ b/src/SharpCompress/Archives/IWritableArchiveExtensions.cs
@@ -39,6 +39,7 @@ public static void SaveTo(this IWritableArchive writableArchive, FileInfo fileIn
             this IWritableArchive writableArchive,
             string filePath, string searchPattern = "*.*", SearchOption searchOption = SearchOption.AllDirectories)
         {
+            writableArchive.PauseInternalEntryUpdates();
 #if NET35
             foreach (var path in Directory.GetFiles(filePath, searchPattern, searchOption))
 #else
@@ -49,7 +50,9 @@ public static void SaveTo(this IWritableArchive writableArchive, FileInfo fileIn
                 writableArchive.AddEntry(path.Substring(filePath.Length), fileInfo.OpenRead(), true, fileInfo.Length,
                                          fileInfo.LastWriteTime);
             }
+            writableArchive.ResumeInternalEntryUpdates();
         }
+
         public static IArchiveEntry AddEntry(this IWritableArchive writableArchive, string key, FileInfo fileInfo)
         {
             if (!fileInfo.Exists)