import mathutil from pyutil

diff --git a/src/allmydata/util/mathutil.py b/src/allmydata/util/mathutil.py
new file mode 100644 (file)
index 0000000..fa58ecc
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+++ b/src/allmydata/util/mathutil.py
@@ -0,0 +1,36 @@
+# Copyright (c) 2005-2007 Bryce "Zooko" Wilcox-O'Hearn
+# mailto:zooko@zooko.com
+# http://zooko.com/repos/pyutil
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this work to deal in this work without restriction (including the rights
+# to use, modify, distribute, sublicense, and/or sell copies).
+
+"""
+A few commonly needed functions.
+"""
+
+import math
+
+def div_ceil(n, d):
+    """
+    The smallest integer k such that k*d >= n.
+    """
+    return (n/d) + (n%d != 0)
+
+def next_multiple(n, k):
+    """
+    The smallest multiple of k which is >= n.
+    """
+    return div_ceil(n, k) * k
+
+def pad_size(n, k):
+    """
+    The smallest number that has to be added to n so that n is a multiple of k.
+    """
+    if n%k:
+        return k - n%k
+    else:
+        return 0
+
+def is_power_of_k(n, k):
+    return k**int(math.log(n, k) + 0.5) == n