/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef mozilla_ipc_Faulty_h
#define mozilla_ipc_Faulty_h

#include <set>
#include <string>
#include "nsDebug.h"
#include "base/string16.h"
#include "base/singleton.h"

#define FAULTY_DEFAULT_PROBABILITY 1000
#define FAULTY_LOG(fmt, args...)                  \
  if (mozilla::ipc::Faulty::IsLoggingEnabled()) { \
    printf_stderr("[Faulty] " fmt "\n", ##args);  \
  }

namespace IPC {
// Needed for blacklisting messages.
class Message;
}  // namespace IPC

namespace mozilla {
namespace ipc {

class Faulty {
 public:
  // Used as a default argument for the Fuzz|datatype| methods.
  static const unsigned int sDefaultProbability;

  static unsigned int DefaultProbability(void);
  static bool Logging(void);
  static bool IsLoggingEnabled(void) { return sIsLoggingEnabled; }

  void FuzzBool(bool* aValue, unsigned int aProbability = sDefaultProbability);
  void FuzzChar(char* aValue, unsigned int aProbability = sDefaultProbability);
  void FuzzUChar(unsigned char* aValue,
                 unsigned int aProbability = sDefaultProbability);
  void FuzzInt16(int16_t* aValue,
                 unsigned int aProbability = sDefaultProbability);
  void FuzzUInt16(uint16_t* aValue,
                  unsigned int aProbability = sDefaultProbability);
  void FuzzInt(int* aValue, unsigned int aProbability = sDefaultProbability);
  void FuzzUInt32(uint32_t* aValue,
                  unsigned int aProbability = sDefaultProbability);
  void FuzzLong(long* aValue, unsigned int aProbability = sDefaultProbability);
  void FuzzULong(unsigned long* aValue,
                 unsigned int aProbability = sDefaultProbability);
  void FuzzInt64(int64_t* aValue,
                 unsigned int aProbability = sDefaultProbability);
  void FuzzUInt64(uint64_t* aValue,
                  unsigned int aProbability = sDefaultProbability);
  void FuzzSize(size_t* aValue,
                unsigned int aProbability = sDefaultProbability);
  void FuzzFloat(float* aValue,
                 unsigned int aProbability = sDefaultProbability);
  void FuzzDouble(double* aValue,
                  unsigned int aProbability = sDefaultProbability);
  void FuzzString(std::string& aValue,
                  unsigned int aProbability = sDefaultProbability);
  void FuzzWString(std::wstring& aValue,
                   unsigned int aProbability = sDefaultProbability);
  void FuzzString16(string16& aValue,
                    unsigned int aProbability = sDefaultProbability);
  void FuzzData(std::string& aData, int aLength,
                unsigned int aProbability = sDefaultProbability);
  void FuzzBytes(void* aData, int aLength,
                 unsigned int aProbability = sDefaultProbability);

  void MaybeCollectAndClosePipe(
      int aPipe, unsigned int aProbability = sDefaultProbability);

 private:
  std::set<int> mFds;

  const bool mFuzzPipes;
  const bool mFuzzPickle;
  const bool mUseLargeValues;
  const bool mIsValidProcessType;

  static const bool sIsLoggingEnabled;

  Faulty();
  friend struct DefaultSingletonTraits<Faulty>;
  DISALLOW_EVIL_CONSTRUCTORS(Faulty);

  static bool IsValidProcessType(void);

  unsigned int Random(unsigned int aMax);
  bool GetChance(unsigned int aProbability);

  void MutateBool(bool* aValue);
  void MutateChar(char* aValue);
  void MutateUChar(unsigned char* aValue);
  void MutateInt16(int16_t* aValue);
  void MutateUInt16(uint16_t* aValue);
  void MutateInt(int* aValue);
  void MutateUInt32(uint32_t* aValue);
  void MutateLong(long* aValue);
  void MutateULong(unsigned long* aValue);
  void MutateInt64(int64_t* aValue);
  void MutateUInt64(uint64_t* aValue);
  void MutateSize(size_t* aValue);
  void MutateFloat(float* aValue);
  void MutateDouble(double* aValue);
};

}  // namespace ipc
}  // namespace mozilla

#endif