From 3c9a6686c0ffd2bb8dff181be454127e35655bee Mon Sep 17 00:00:00 2001
From: Hanjin Liu <liuhanjin-sc@i.softbank.jp>
Date: Sat, 13 Jul 2024 22:58:02 +0900
Subject: [PATCH] fix for file size larger than C long max size

---
 mrcfile/mrcmemmap.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mrcfile/mrcmemmap.py b/mrcfile/mrcmemmap.py
index 53ad678..cda10b9 100644
--- a/mrcfile/mrcmemmap.py
+++ b/mrcfile/mrcmemmap.py
@@ -114,7 +114,7 @@ def _read_data(self):
     def _open_memmap(self, dtype, shape):
         """Open a new memmap array pointing at the file's data block."""
         acc_mode = 'r' if self._read_only else 'r+'
-        header_nbytes = self.header.nbytes + self.header.nsymbt
+        header_nbytes = int(self.header.nbytes + self.header.nsymbt)
         
         self._iostream.flush()
         try: