// Copyright 2021 The Tint Authors. // // 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. #ifndef FUZZERS_MERSENNE_TWISTER_ENGINE_H_ #define FUZZERS_MERSENNE_TWISTER_ENGINE_H_ #include <random> #include "fuzzers/random_generator_engine.h" namespace tint { namespace fuzzers { /// Standard MT based random number generation class MersenneTwisterEngine : public RandomGeneratorEngine { public: /// @brief Initializes using provided seed /// @param seed - seed value to use explicit MersenneTwisterEngine(uint64_t seed); ~MersenneTwisterEngine() override = default; /// Generate random uint32_t value from uniform distribution. /// @param lower - lower bound of integer generated /// @param upper - upper bound of integer generated /// @returns i, where lower <= i < upper uint32_t RandomUInt32(uint32_t lower, uint32_t upper) override; /// Get random uint64_t value from uniform distribution. /// @param lower - lower bound of integer generated /// @param upper - upper bound of integer generated /// @returns i, where lower <= i < upper uint64_t RandomUInt64(uint64_t lower, uint64_t upper) override; /// Get N bytes of pseudo-random data /// @param dest - memory location to store data /// @param n - number of bytes of data to generate void RandomNBytes(uint8_t* dest, size_t n) override; private: // Disallow copy & assign MersenneTwisterEngine(const MersenneTwisterEngine&) = delete; MersenneTwisterEngine& operator=(const MersenneTwisterEngine&) = delete; std::mt19937_64 engine_; }; // class MersenneTwisterEngine } // namespace fuzzers } // namespace tint #endif // FUZZERS_MERSENNE_TWISTER_ENGINE_H_