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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_RANDOM_GENERATOR_ENGINE_H_
#define FUZZERS_RANDOM_GENERATOR_ENGINE_H_
#include <memory>
#include <random>
#include <vector>
namespace tint {
namespace fuzzers {
/// Wrapper interface around STL random number engine
class RandomGeneratorEngine {
public:
RandomGeneratorEngine();
virtual ~RandomGeneratorEngine();
RandomGeneratorEngine(RandomGeneratorEngine&&);
/// 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
virtual uint32_t RandomUInt32(uint32_t lower, uint32_t upper) = 0;
/// 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
virtual uint64_t RandomUInt64(uint64_t lower, uint64_t upper) = 0;
/// Get N bytes of pseudo-random data
/// @param dest - memory location to store data
/// @param n - number of bytes of data to generate
virtual void RandomNBytes(uint8_t* dest, size_t n) = 0;
private:
// Disallow copy & assign
RandomGeneratorEngine(const RandomGeneratorEngine&) = delete;
RandomGeneratorEngine& operator=(const RandomGeneratorEngine&) = delete;
}; // class RandomGeneratorEngine
} // namespace fuzzers
} // namespace tint
#endif // FUZZERS_RANDOM_GENERATOR_ENGINE_H_