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// Copyright 2021 The Dawn & Tint Authors
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this
// list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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#ifndef SRC_TINT_FUZZERS_MERSENNE_TWISTER_ENGINE_H_
#define SRC_TINT_FUZZERS_MERSENNE_TWISTER_ENGINE_H_
#include <random>
#include "src/tint/fuzzers/random_generator_engine.h"
namespace tint::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 tint::fuzzers
#endif // SRC_TINT_FUZZERS_MERSENNE_TWISTER_ENGINE_H_