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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 "mozilla/ipc/SharedMemory.h"
+
+#ifdef FUZZING
+# include "mozilla/ipc/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() = default;
+
+ virtual bool SetHandle(Handle aHandle, OpenRights aRights) override {
+ return mSharedMemory.SetHandle(std::move(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 Unmap() override { mSharedMemory.Unmap(); }
+
+ 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
+ }
+
+ static Handle NULLHandle() { return base::SharedMemory::NULLHandle(); }
+
+ virtual bool IsHandleValid(const Handle& aHandle) const override {
+ return base::SharedMemory::IsHandleValid(aHandle);
+ }
+
+ virtual Handle CloneHandle() override { return mSharedMemory.CloneHandle(); }
+
+ static void* FindFreeAddressSpace(size_t size) {
+ return base::SharedMemory::FindFreeAddressSpace(size);
+ }
+
+ private:
+ ~SharedMemoryBasic() = default;
+
+ base::SharedMemory mSharedMemory;
+};
+
+} // namespace ipc
+} // namespace mozilla
+
+#endif // ifndef mozilla_ipc_SharedMemoryBasic_chromium_h