safe_math.h

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// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
 
#ifndef FLUTTER_FML_SAFE_MATH_H_
#define FLUTTER_FML_SAFE_MATH_H_
 
#include <cstddef>
#include <cstdint>
 
namespace fml {
 
// Math operations that check for overflow.
// Based on Skia's SkSafeMath.
class SafeMath {
 public:
  bool overflow_detected() const { return overflow_detected_; }
 
  size_t mul(size_t x, size_t y);
 
 private:
  uint32_t mul32(uint32_t x, uint32_t y);
  uint64_t mul64(uint64_t x, uint64_t y);
 
  bool overflow_detected_ = false;
};
 
}  // namespace fml
 
#endif  // FLUTTER_FML_SAFE_MATH_H_