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/* -*- 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_SharedMemoryBasic_chromium_h
#define mozilla_ipc_SharedMemoryBasic_chromium_h

#include "base/shared_memory.h"
#include "SharedMemory.h"

#ifdef FUZZING
#  include "SharedMemoryFuzzer.h"
#endif

#include "nsDebug.h"

//
// This is a low-level wrapper around platform shared memory.  Don't
// use it directly; use Shmem allocated through IPDL interfaces.
//

namespace mozilla {
namespace ipc {

class SharedMemoryBasic final
    : public SharedMemoryCommon<base::SharedMemoryHandle> {
 public:
  SharedMemoryBasic() {}

  virtual bool SetHandle(const Handle& aHandle, OpenRights aRights) override {
    return mSharedMemory.SetHandle(aHandle, aRights == RightsReadOnly);
  }

  virtual bool Create(size_t aNbytes) override {
    bool ok = mSharedMemory.Create(aNbytes);
    if (ok) {
      Created(aNbytes);
    }
    return ok;
  }

  virtual bool Map(size_t nBytes, void* fixed_address = nullptr) override {
    bool ok = mSharedMemory.Map(nBytes, fixed_address);
    if (ok) {
      Mapped(nBytes);
    }
    return ok;
  }

  virtual void CloseHandle() override { mSharedMemory.Close(false); }

  virtual void* memory() const override {
#ifdef FUZZING
    return SharedMemoryFuzzer::MutateSharedMemory(mSharedMemory.memory(),
                                                  mAllocSize);
#else
    return mSharedMemory.memory();
#endif
  }

  virtual SharedMemoryType Type() const override { return TYPE_BASIC; }

  static Handle NULLHandle() { return base::SharedMemory::NULLHandle(); }

  virtual bool IsHandleValid(const Handle& aHandle) const override {
    return base::SharedMemory::IsHandleValid(aHandle);
  }

  virtual bool ShareToProcess(base::ProcessId aProcessId,
                              Handle* new_handle) override {
    base::SharedMemoryHandle handle;
    bool ret = mSharedMemory.ShareToProcess(aProcessId, &handle);
    if (ret) *new_handle = handle;
    return ret;
  }

  static void* FindFreeAddressSpace(size_t size) {
    return base::SharedMemory::FindFreeAddressSpace(size);
  }

 private:
  ~SharedMemoryBasic() {}

  base::SharedMemory mSharedMemory;
};

}  // namespace ipc
}  // namespace mozilla

#endif  // ifndef mozilla_ipc_SharedMemoryBasic_chromium_h