1 files changed, 85 insertions, 0 deletions
diff --git a/dom/media/eme/clearkey/RefCounted.h b/dom/media/eme/clearkey/RefCounted.h
new file mode 100644
index 0000000000..25f308164c
--- /dev/null
+++ b/dom/media/eme/clearkey/RefCounted.h
@@ -0,0 +1,85 @@
+/*
+ * Copyright 2015, Mozilla Foundation and contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef __RefCount_h__
+#define __RefCount_h__
+
+#include <assert.h>
+#include <stdint.h>
+
+#include <atomic>
+
+#include "ClearKeyUtils.h"
+
+// Note: Thread safe.
+class RefCounted {
+ public:
+  void AddRef() { ++mRefCount; }
+
+  uint32_t Release() {
+    uint32_t newCount = --mRefCount;
+    if (!newCount) {
+      delete this;
+    }
+    return newCount;
+  }
+
+ protected:
+  RefCounted() : mRefCount(0) {}
+  virtual ~RefCounted() { assert(!mRefCount); }
+  std::atomic<uint32_t> mRefCount;
+};
+
+template <class T>
+class RefPtr {
+ public:
+  RefPtr(const RefPtr& src) { Set(src.mPtr); }
+
+  explicit RefPtr(T* aPtr) { Set(aPtr); }
+  RefPtr() { Set(nullptr); }
+
+  ~RefPtr() { Set(nullptr); }
+  T* operator->() const { return mPtr; }
+  T** operator&() { return &mPtr; }
+  T* operator->() { return mPtr; }
+  operator T*() { return mPtr; }
+
+  T* Get() const { return mPtr; }
+
+  RefPtr& operator=(T* aVal) {
+    Set(aVal);
+    return *this;
+  }
+
+ private:
+  T* Set(T* aPtr) {
+    if (mPtr == aPtr) {
+      return aPtr;
+    }
+    if (mPtr) {
+      mPtr->Release();
+    }
+    mPtr = aPtr;
+    if (mPtr) {
+      aPtr->AddRef();
+    }
+    return mPtr;
+  }
+
+  T* mPtr = nullptr;
+};
+
+#endif  // __RefCount_h__