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 RandU32()17inline uint32 RandU32() { 18 return g_mersenne_twister->genrand_int32(); 19 } 20 RandU64()21inline uint64 RandU64() { 22 return (static_cast<uint64>(RandU32()) << 32) | RandU32(); 23 } 24 RandDouble()25inline double RandDouble() { 26 uint64 rand_u64 = RandU64(); 27 return *reinterpret_cast<double*>(&rand_u64); 28 } 29 RandInRange(uint32 range)30inline uint32 RandInRange(uint32 range) { 31 return RandU32() % range; 32 } 33 RandEvent(uint32 frequency)34inline 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