88 lines
2.8 KiB
C++
88 lines
2.8 KiB
C++
// 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_H_
|
|
#define FUZZERS_RANDOM_GENERATOR_H_
|
|
|
|
#include <random>
|
|
#include <vector>
|
|
|
|
namespace tint {
|
|
namespace fuzzers {
|
|
|
|
/// Pseudo random generator utility class for fuzzing
|
|
class RandomGenerator {
|
|
public:
|
|
/// @brief Initializes the internal engine
|
|
/// @param seed - seed value passed to engine
|
|
explicit RandomGenerator(uint32_t seed);
|
|
~RandomGenerator() {}
|
|
|
|
/// Get 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 GetUInt32(uint32_t lower, uint32_t upper);
|
|
|
|
/// Get uint32_t value from uniform distribution.
|
|
/// @param bound - Upper bound of integer generated
|
|
/// @returns i, where 0 <= i < bound
|
|
uint32_t GetUInt32(uint32_t bound);
|
|
|
|
/// Get 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
|
|
uint64_t GetUInt64(uint64_t lower, uint64_t upper);
|
|
|
|
/// Get uint64_t value from uniform distribution.
|
|
/// @param bound - Upper bound of integer generated
|
|
/// @returns i, where 0 <= i < bound
|
|
uint64_t GetUInt64(uint64_t bound);
|
|
|
|
/// Get 1 byte of pseudo-random data
|
|
/// Should be more efficient then calling GetNBytes(1);
|
|
/// @returns 1-byte of random data
|
|
uint8_t GetByte();
|
|
|
|
/// Get 4 bytes of pseudo-random data
|
|
/// Should be more efficient then calling GetNBytes(4);
|
|
/// @returns 4-bytes of random data
|
|
uint32_t Get4Bytes();
|
|
|
|
/// Get N bytes of pseudo-random data
|
|
/// @param n - number of bytes of data to generate
|
|
/// @returns |N|-bytes of random data as vector
|
|
std::vector<uint8_t> GetNBytes(size_t n);
|
|
|
|
/// Get random bool with even odds
|
|
/// @returns true 50% of the time and false %50 of time.
|
|
bool GetBool();
|
|
|
|
/// Get random bool with weighted odds
|
|
/// @param percentage - likelihood of true being returned
|
|
/// @returns true |percentage|% of the time, and false (100 - |percentage|)%
|
|
/// of the time.
|
|
bool GetWeightedBool(uint32_t percentage);
|
|
|
|
private:
|
|
std::mt19937 engine_;
|
|
|
|
}; // class RandomGenerator
|
|
|
|
} // namespace fuzzers
|
|
} // namespace tint
|
|
|
|
#endif // FUZZERS_RANDOM_GENERATOR_H_
|