1 files changed, 97 insertions, 0 deletions
diff --git a/dom/media/eme/MediaKeyStatusMap.h b/dom/media/eme/MediaKeyStatusMap.h
new file mode 100644
index 000000000..396ae500e
--- /dev/null
+++ b/dom/media/eme/MediaKeyStatusMap.h
@@ -0,0 +1,97 @@
+/* -*- 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_dom_MediaKeyStatuses_h
+#define mozilla_dom_MediaKeyStatuses_h
+
+#include "mozilla/ErrorResult.h"
+#include "mozilla/Attributes.h"
+#include "nsCycleCollectionParticipant.h"
+#include "nsWrapperCache.h"
+
+#include "mozilla/dom/TypedArray.h"
+#include "mozilla/dom/MediaKeyStatusMapBinding.h"
+#include "mozilla/CDMCaps.h"
+
+class nsPIDOMWindowInner;
+
+namespace mozilla {
+namespace dom {
+
+class ArrayBufferViewOrArrayBuffer;
+
+// The MediaKeyStatusMap WebIDL interface; maps a keyId to its status.
+// Note that the underlying "map" is stored in an array, since we assume
+// that a MediaKeySession won't have many key statuses to report.
+class MediaKeyStatusMap final : public nsISupports,
+                                public nsWrapperCache
+{
+public:
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(MediaKeyStatusMap)
+
+public:
+  explicit MediaKeyStatusMap(nsPIDOMWindowInner* aParent);
+
+protected:
+  ~MediaKeyStatusMap();
+
+public:
+  nsPIDOMWindowInner* GetParentObject() const;
+
+  JSObject* WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) override;
+
+  void Get(JSContext* aCx,
+           const ArrayBufferViewOrArrayBuffer& aKey,
+           JS::MutableHandle<JS::Value> aOutValue,
+           ErrorResult& aOutRv) const;
+  bool Has(const ArrayBufferViewOrArrayBuffer& aKey) const;
+  uint32_t Size() const;
+
+  uint32_t GetIterableLength() const;
+  TypedArrayCreator<ArrayBuffer> GetKeyAtIndex(uint32_t aIndex) const;
+  MediaKeyStatus GetValueAtIndex(uint32_t aIndex) const;
+
+  void Update(const nsTArray<CDMCaps::KeyStatus>& keys);
+
+private:
+
+  nsCOMPtr<nsPIDOMWindowInner> mParent;
+
+  struct KeyStatus {
+    KeyStatus(const nsTArray<uint8_t>& aKeyId,
+              MediaKeyStatus aStatus)
+      : mKeyId(aKeyId)
+      , mStatus(aStatus)
+    {
+    }
+    bool operator== (const KeyStatus& aOther) const {
+      return aOther.mKeyId == mKeyId;
+    }
+    bool operator<(const KeyStatus& aOther) const {
+      // Copy chromium and compare keys' bytes.
+      // Update once https://github.com/w3c/encrypted-media/issues/69
+      // is resolved.
+      const nsTArray<uint8_t>& other = aOther.mKeyId;
+      const nsTArray<uint8_t>& self = mKeyId;
+      size_t length = std::min<size_t>(other.Length(), self.Length());
+      int cmp = memcmp(self.Elements(), other.Elements(), length);
+      if (cmp != 0) {
+        return cmp < 0;
+      }
+      return self.Length() <= other.Length();
+    }
+    nsTArray<uint8_t> mKeyId;
+    MediaKeyStatus mStatus;
+  };
+
+  nsTArray<KeyStatus> mStatuses;
+};
+
+} // namespace dom
+} // namespace mozilla
+
+#endif