1 /* 2 * Copyright (C) 2025 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 #include "utils.h" 17 18 #include <cstdlib> 19 #include <ctime> 20 #include <limits> 21 #include <random> 22 #include <unordered_set> 23 24 namespace android { 25 namespace os { 26 namespace statsd { 27 generateRandomIds(int count,int maxRange)28std::vector<int> generateRandomIds(int count, int maxRange) { 29 std::srand(std::time(nullptr)); 30 31 std::unordered_set<int> unique_values; 32 33 while (unique_values.size() <= count) { 34 unique_values.insert(std::rand() % maxRange); 35 } 36 37 std::vector<int> result(unique_values.begin(), unique_values.end()); 38 39 return result; 40 } 41 generateRandomHashIds(int count)42std::vector<int64_t> generateRandomHashIds(int count) { 43 std::srand(std::time(nullptr)); 44 45 std::random_device rd; 46 std::mt19937_64 eng(rd()); 47 48 std::uniform_int_distribution<int64_t> distr; 49 50 std::unordered_set<int> unique_values; 51 52 while (unique_values.size() <= count) { 53 unique_values.insert(distr(eng)); 54 } 55 56 std::vector<int64_t> result(unique_values.begin(), unique_values.end()); 57 58 return result; 59 } 60 61 } // namespace statsd 62 } // namespace os 63 } // namespace android