1 files changed, 30 insertions, 0 deletions
diff --git a/ranger/ext/hash.py b/ranger/ext/hash.py
new file mode 100644
index 00000000..d9b2234b
--- /dev/null
+++ b/ranger/ext/hash.py
@@ -0,0 +1,30 @@
+# This file is part of ranger, the console file manager.
+# License: GNU GPL version 3, see the file "AUTHORS" for details.
+
+from __future__ import (absolute_import, division, print_function)
+
+from os import listdir
+from os.path import getsize, isdir
+from hashlib import sha256
+
+# pylint: disable=invalid-name
+
+
+def hash_chunks(filepath, h=None):
+    if not h:
+        h = sha256()
+    if isdir(filepath):
+        h.update(filepath)
+        yield h.hexdigest()
+        for fp in listdir(filepath):
+            for fp_chunk in hash_chunks(fp, h=h):
+                yield fp_chunk
+    elif getsize(filepath) == 0:
+        yield h.hexdigest()
+    else:
+        with open(filepath, 'rb') as f:
+            # Read the file in ~64KiB chunks (multiple of sha256's block
+            # size that works well enough with HDDs and SSDs)
+            for chunk in iter(lambda: f.read(h.block_size * 1024), b''):
+                h.update(chunk)
+                yield h.hexdigest()