From dc589e5b78f0cc7fce4d6917bb80f002c31bd288 Mon Sep 17 00:00:00 2001
From: Gan Keyu <gankeyu@hotmail.com>
Date: Sun, 19 Nov 2023 14:04:34 +0800
Subject: [PATCH] Check LH offset when writing LH. Fix #94899

ZipArchiveEntry didn't set ZIP64 in local
headers for small files if their offset are
>4GB.
---
 .../src/System/IO/Compression/ZipArchiveEntry.cs                | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/libraries/System.IO.Compression/src/System/IO/Compression/ZipArchiveEntry.cs b/src/libraries/System.IO.Compression/src/System/IO/Compression/ZipArchiveEntry.cs
index 14988fcab72817..00a51d081bdad7 100644
--- a/src/libraries/System.IO.Compression/src/System/IO/Compression/ZipArchiveEntry.cs
+++ b/src/libraries/System.IO.Compression/src/System/IO/Compression/ZipArchiveEntry.cs
@@ -964,7 +964,7 @@ private void WriteCrcAndSizesInLocalHeader(bool zip64HeaderUsed)
             long finalPosition = _archive.ArchiveStream.Position;
             BinaryWriter writer = new BinaryWriter(_archive.ArchiveStream);
 
-            bool zip64Needed = SizesTooLarge()
+            bool zip64Needed = SizesTooLarge() || (_offsetOfLocalHeader > uint.MaxValue)
 #if DEBUG_FORCE_ZIP64
                 || _archive._forceZip64
 #endif