63 lines
2.1 KiB
C
63 lines
2.1 KiB
C
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// Copyright 2021 The Tint Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef FUZZERS_MERSENNE_TWISTER_ENGINE_H_
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#define FUZZERS_MERSENNE_TWISTER_ENGINE_H_
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#include <random>
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#include "fuzzers/random_generator_engine.h"
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namespace tint {
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namespace fuzzers {
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/// Standard MT based random number generation
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class MersenneTwisterEngine : public RandomGeneratorEngine {
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public:
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/// @brief Initializes using provided seed
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/// @param seed - seed value to use
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explicit MersenneTwisterEngine(uint64_t seed);
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~MersenneTwisterEngine() override = default;
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/// Generate random uint32_t value from uniform distribution.
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/// @param lower - lower bound of integer generated
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/// @param upper - upper bound of integer generated
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/// @returns i, where lower <= i < upper
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uint32_t RandomUInt32(uint32_t lower, uint32_t upper) override;
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/// Get random uint64_t value from uniform distribution.
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/// @param lower - lower bound of integer generated
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/// @param upper - upper bound of integer generated
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/// @returns i, where lower <= i < upper
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uint64_t RandomUInt64(uint64_t lower, uint64_t upper) override;
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/// Get N bytes of pseudo-random data
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/// @param dest - memory location to store data
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/// @param n - number of bytes of data to generate
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void RandomNBytes(uint8_t* dest, size_t n) override;
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private:
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// Disallow copy & assign
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MersenneTwisterEngine(const MersenneTwisterEngine&) = delete;
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MersenneTwisterEngine& operator=(const MersenneTwisterEngine&) = delete;
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std::mt19937_64 engine_;
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}; // class MersenneTwisterEngine
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} // namespace fuzzers
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} // namespace tint
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#endif // FUZZERS_MERSENNE_TWISTER_ENGINE_H_
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