From 4f01e5bd57918a35ca65e63aa2939abcef4d1dbc Mon Sep 17 00:00:00 2001
From: Serhiy Storchaka <storchaka@gmail.com>
Date: Tue, 3 Nov 2020 16:15:56 +0200
Subject: [PATCH] bpo-42249: Fix writing binary Plist files larger than 4 GiB.
 (GH-23121) (cherry picked from commit
 212d32f45c91849c17a82750df1ac498d63976be)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
---
 Lib/plistlib.py                                                 | 2 +-
 .../next/Library/2020-11-03-09-22-56.bpo-42249.vfNO2u.rst       | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)
 create mode 100644 Misc/NEWS.d/next/Library/2020-11-03-09-22-56.bpo-42249.vfNO2u.rst

diff --git a/Lib/plistlib.py b/Lib/plistlib.py
index 83b214e9dc49bf..2eeebe4c9a4244 100644
--- a/Lib/plistlib.py
+++ b/Lib/plistlib.py
@@ -611,7 +611,7 @@ def _count_to_size(count):
     elif count < 1 << 16:
         return 2
 
-    elif count << 1 << 32:
+    elif count < 1 << 32:
         return 4
 
     else:
diff --git a/Misc/NEWS.d/next/Library/2020-11-03-09-22-56.bpo-42249.vfNO2u.rst b/Misc/NEWS.d/next/Library/2020-11-03-09-22-56.bpo-42249.vfNO2u.rst
new file mode 100644
index 00000000000000..071a0fdda1ff80
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2020-11-03-09-22-56.bpo-42249.vfNO2u.rst
@@ -0,0 +1 @@
+Fixed writing binary Plist files larger than 4 GiB.