python/build/verify: move code to feed_file()

python/build/verify.py

@@ -1,13 +1,24 @@
 import hashlib
 
-def file_md5(path):
+def feed_file(h, f):
-    """Calculate the MD5 checksum of a file and return it in hexadecimal notation."""
+    """Feed data read from an open file into the hashlib instance."""
 
-    with open(path, 'rb') as f:
-        m = hashlib.md5()
     while True:
         data = f.read(65536)
         if len(data) == 0:
             # end of file
-                return m.hexdigest()
+            break
-            m.update(data)
+        h.update(data)
+
+def feed_file_path(h, path):
+    """Feed data read from a file (to be opened by this function) into the hashlib instance."""
+
+    with open(path, 'rb') as f:
+        feed_file(h, f)
+
+def file_md5(path):
+    """Calculate the MD5 checksum of a file and return it in hexadecimal notation."""
+
+    h = hashlib.md5()
+    feed_file_path(h, path)
+    return h.hexdigest()