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      1 // Copyright 2014 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef TOOLS_IPC_FUZZER_MUTATE_RAND_UTIL_H_
      6 #define TOOLS_IPC_FUZZER_MUTATE_RAND_UTIL_H_
      7 
      8 #include "base/basictypes.h"
      9 #include "third_party/mt19937ar/mt19937ar.h"
     10 
     11 namespace ipc_fuzzer {
     12 
     13 extern MersenneTwister* g_mersenne_twister;
     14 
     15 void InitRand();
     16 
     17 inline uint32 RandU32() {
     18   return g_mersenne_twister->genrand_int32();
     19 }
     20 
     21 inline uint64 RandU64() {
     22   return (static_cast<uint64>(RandU32()) << 32) | RandU32();
     23 }
     24 
     25 inline double RandDouble() {
     26   uint64 rand_u64 = RandU64();
     27   return *reinterpret_cast<double*>(&rand_u64);
     28 }
     29 
     30 inline uint32 RandInRange(uint32 range) {
     31   return RandU32() % range;
     32 }
     33 
     34 inline bool RandEvent(uint32 frequency) {
     35   return RandInRange(frequency) == 0;
     36 }
     37 
     38 }  // namespace ipc_fuzzer
     39 
     40 #endif  // TOOLS_IPC_FUZZER_MUTATE_RAND_UTIL_H_
     41