tools/ipc_fuzzer/fuzzer/rand_util.h

   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 inline size_t RandElementCount() {
  39   return RandU32() % 10;
  40 }
  41
  42 }  // namespace ipc_fuzzer
  43
  44 #endif  // TOOLS_IPC_FUZZER_MUTATE_RAND_UTIL_H_