text: // Copyright 2014 The Chromium Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  
  #ifndef TOOLS_IPC_FUZZER_MUTATE_RAND_UTIL_H_
  #define TOOLS_IPC_FUZZER_MUTATE_RAND_UTIL_H_
  
  #include <stddef.h>
  #include <stdint.h>
  
  #include "third_party/mt19937ar/mt19937ar.h"
  
  namespace ipc_fuzzer {
  
  extern MersenneTwister* g_mersenne_twister;
  
  void InitRand();
  
  inline uint32_t RandU32() {
    return g_mersenne_twister->genrand_int32();
  }
  
  inline uint64_t RandU64() {
    return (static_cast<uint64_t>(RandU32()) << 32) | RandU32();
  }
  
  inline double RandDouble() {
    uint64_t rand_u64 = RandU64();
    return *reinterpret_cast<double*>(&rand_u64);
  }
  
  inline uint32_t RandInRange(uint32_t range) {
    return RandU32() % range;
  }
  
  inline bool RandEvent(uint32_t frequency) {
    return RandInRange(frequency) == 0;
  }
  
  inline size_t RandElementCount() {
    return RandU32() % 10;
  }
  
  }  // namespace ipc_fuzzer
  
  #endif  // TOOLS_IPC_FUZZER_MUTATE_RAND_UTIL_H_
  