1 /*
2  * Copyright (C) 2017 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #ifndef NETUTILS_MATH_H
18 #define NETUTILS_MATH_H
19 
20 #include <algorithm>
21 #include <cstdint>
22 
23 namespace android {
24 namespace netdutils {
25 
26 template <class T>
mask(const int shift)27 inline constexpr const T mask(const int shift) {
28     return (1 << shift) - 1;
29 }
30 
31 // Align x up to the nearest integer multiple of 2^shift
32 template <class T>
align(const T & x,const int shift)33 inline constexpr const T align(const T& x, const int shift) {
34     return (x + mask<T>(shift)) & ~mask<T>(shift);
35 }
36 
37 }  // namespace netdutils
38 }  // namespace android
39 
40 #endif /* NETUTILS_MATH_H */
41