round.h

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// Copyright 2013 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// Helper for rounding

#ifndef WOFF2_ROUND_H_
#define WOFF2_ROUND_H_

#include <limits>

namespace woff2 {

// Round a value up to the nearest multiple of 4. Don't round the value in the
// case that rounding up overflows.
template<typename T> T Round4(T value) {
  if (std::numeric_limits<T>::max() - value < 3) {
    return value;
  }
  return (value + 3) & ~3;
}

} // namespace woff2

#endif  // WOFF2_ROUND_H_