1 files changed, 34 insertions, 0 deletions
diff --git a/src/crc32c_round_up.h b/src/crc32c_round_up.h
new file mode 100644
index 0000000000..d3b922beb9
--- /dev/null
+++ b/src/crc32c_round_up.h
@@ -0,0 +1,34 @@
+// Copyright 2017 The CRC32C Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file. See the AUTHORS file for names of contributors.
+
+#ifndef CRC32C_CRC32C_ROUND_UP_H_
+#define CRC32C_CRC32C_ROUND_UP_H_
+
+#include <cstddef>
+#include <cstdint>
+
+namespace crc32c {
+
+// Returns the smallest number >= the given number that is evenly divided by N.
+//
+// N must be a power of two.
+template <int N>
+constexpr inline uintptr_t RoundUp(uintptr_t pointer) {
+  static_assert((N & (N - 1)) == 0, "N must be a power of two");
+  return (pointer + (N - 1)) & ~(N - 1);
+}
+
+// Returns the smallest address >= the given address that is aligned to N bytes.
+//
+// N must be a power of two.
+template <int N>
+constexpr inline const uint8_t* RoundUp(const uint8_t* pointer) {
+  static_assert((N & (N - 1)) == 0, "N must be a power of two");
+  return reinterpret_cast<uint8_t*>(
+      RoundUp<N>(reinterpret_cast<uintptr_t>(pointer)));
+}
+
+}  // namespace crc32c
+
+#endif  // CRC32C_CRC32C_ROUND_UP_H_