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// 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_