From 891a8759902e5871055a48fd9e7c4067a4917614 Mon Sep 17 00:00:00 2001
From: glubsy <glubsy@users.noreply.github.com>
Date: Fri, 13 Aug 2021 21:33:21 +0200
Subject: [PATCH] Cache constant expression

Perhaps the python byte code is already optimized, but just in case it is not, keep pre-compute the constant expression.
---
 core/fs.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/core/fs.py b/core/fs.py
index 9fc89cfb..abb8c3fc 100644
--- a/core/fs.py
+++ b/core/fs.py
@@ -36,6 +36,8 @@ NOT_SET = object()
 # CPU.
 CHUNK_SIZE = 1024 * 1024  # 1 MiB
 
+# Minimum size below which partial hashes don't need to be computed
+MIN_FILE_SIZE = 3 * CHUNK_SIZE  # 3MiB, because we take 3 samples
 
 class FSError(Exception):
     cls_message = "An error has occured on '{name}' in '{parent}'"
@@ -153,7 +155,7 @@ class File:
                 with self.path.open("rb") as fp:
                     size = self.size
                     # Might as well hash such small files entirely.
-                    if size <= CHUNK_SIZE * 3:  # 3MiB, because 3 samples
+                    if size <= MIN_FILE_SIZE:
                         setattr(self, field, self.md5)
                         return