1 /* 2 * Copyright (c) 2021 The WebRTC project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 #ifndef NET_DCSCTP_COMMON_MATH_H_ 11 #define NET_DCSCTP_COMMON_MATH_H_ 12 13 namespace dcsctp { 14 15 // Rounds up `val` to the nearest value that is divisible by four. Frequently 16 // used to e.g. pad chunks or parameters to an even 32-bit offset. 17 template <typename IntType> RoundUpTo4(IntType val)18IntType RoundUpTo4(IntType val) { 19 return (val + 3) & ~3; 20 } 21 22 // Similarly, rounds down `val` to the nearest value that is divisible by four. 23 template <typename IntType> RoundDownTo4(IntType val)24IntType RoundDownTo4(IntType val) { 25 return val & ~3; 26 } 27 28 // Returns true if `val` is divisible by four. 29 template <typename IntType> IsDivisibleBy4(IntType val)30bool IsDivisibleBy4(IntType val) { 31 return (val & 3) == 0; 32 } 33 34 } // namespace dcsctp 35 36 #endif // NET_DCSCTP_COMMON_MATH_H_ 37