1 files changed, 87 insertions, 0 deletions
diff --git a/ipc/glue/SharedMemoryBasic_chromium.h b/ipc/glue/SharedMemoryBasic_chromium.h
new file mode 100644
index 0000000000..c48898c47d
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+++ b/ipc/glue/SharedMemoryBasic_chromium.h
@@ -0,0 +1,87 @@
+/* -*- 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