1 // Copyright 2021 The Tint Authors. 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 #ifndef FUZZERS_RANDOM_GENERATOR_ENGINE_H_ 16 #define FUZZERS_RANDOM_GENERATOR_ENGINE_H_ 17 18 #include <memory> 19 #include <random> 20 #include <vector> 21 22 namespace tint { 23 namespace fuzzers { 24 25 /// Wrapper interface around STL random number engine 26 class RandomGeneratorEngine { 27 public: 28 RandomGeneratorEngine(); 29 virtual ~RandomGeneratorEngine(); 30 RandomGeneratorEngine(RandomGeneratorEngine&&); 31 32 /// Generate random uint32_t value from uniform distribution. 33 /// @param lower - lower bound of integer generated 34 /// @param upper - upper bound of integer generated 35 /// @returns i, where lower <= i < upper 36 virtual uint32_t RandomUInt32(uint32_t lower, uint32_t upper) = 0; 37 38 /// Get random uint64_t value from uniform distribution. 39 /// @param lower - lower bound of integer generated 40 /// @param upper - upper bound of integer generated 41 /// @returns i, where lower <= i < upper 42 virtual uint64_t RandomUInt64(uint64_t lower, uint64_t upper) = 0; 43 44 /// Get N bytes of pseudo-random data 45 /// @param dest - memory location to store data 46 /// @param n - number of bytes of data to generate 47 virtual void RandomNBytes(uint8_t* dest, size_t n) = 0; 48 49 private: 50 // Disallow copy & assign 51 RandomGeneratorEngine(const RandomGeneratorEngine&) = delete; 52 RandomGeneratorEngine& operator=(const RandomGeneratorEngine&) = delete; 53 }; // class RandomGeneratorEngine 54 55 } // namespace fuzzers 56 } // namespace tint 57 58 #endif // FUZZERS_RANDOM_GENERATOR_ENGINE_H_ 59