Line data    Source code

       1             : /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
       2             : /* vim: set ts=8 sts=2 et sw=2 tw=80: */
       3             : /* This Source Code Form is subject to the terms of the Mozilla Public
       4             :  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
       5             :  * You can obtain one at http://mozilla.org/MPL/2.0/. */
       6             : 
       7             : #ifndef mozilla_dom_MediaKeyStatuses_h
       8             : #define mozilla_dom_MediaKeyStatuses_h
       9             : 
      10             : #include "mozilla/ErrorResult.h"
      11             : #include "mozilla/Attributes.h"
      12             : #include "nsCycleCollectionParticipant.h"
      13             : #include "nsWrapperCache.h"
      14             : 
      15             : #include "mozilla/dom/TypedArray.h"
      16             : #include "mozilla/dom/MediaKeyStatusMapBinding.h"
      17             : #include "mozilla/CDMCaps.h"
      18             : 
      19             : class nsPIDOMWindowInner;
      20             : 
      21             : namespace mozilla {
      22             : namespace dom {
      23             : 
      24             : class ArrayBufferViewOrArrayBuffer;
      25             : 
      26             : // The MediaKeyStatusMap WebIDL interface; maps a keyId to its status.
      27             : // Note that the underlying "map" is stored in an array, since we assume
      28             : // that a MediaKeySession won't have many key statuses to report.
      29             : class MediaKeyStatusMap final : public nsISupports,
      30             :                                 public nsWrapperCache
      31             : {
      32             : public:
      33             :   NS_DECL_CYCLE_COLLECTING_ISUPPORTS
      34           0 :   NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(MediaKeyStatusMap)
      35             : 
      36             : public:
      37             :   explicit MediaKeyStatusMap(nsPIDOMWindowInner* aParent);
      38             : 
      39             : protected:
      40             :   ~MediaKeyStatusMap();
      41             : 
      42             : public:
      43             :   nsPIDOMWindowInner* GetParentObject() const;
      44             : 
      45             :   JSObject* WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) override;
      46             : 
      47             :   void Get(JSContext* aCx,
      48             :            const ArrayBufferViewOrArrayBuffer& aKey,
      49             :            JS::MutableHandle<JS::Value> aOutValue,
      50             :            ErrorResult& aOutRv) const;
      51             :   bool Has(const ArrayBufferViewOrArrayBuffer& aKey) const;
      52             :   uint32_t Size() const;
      53             : 
      54             :   uint32_t GetIterableLength() const;
      55             :   TypedArrayCreator<ArrayBuffer> GetKeyAtIndex(uint32_t aIndex) const;
      56             :   nsString GetKeyIDAsHexString(uint32_t aIndex) const;
      57             :   MediaKeyStatus GetValueAtIndex(uint32_t aIndex) const;
      58             : 
      59             :   void Update(const nsTArray<CDMCaps::KeyStatus>& keys);
      60             : 
      61             : private:
      62             : 
      63             :   nsCOMPtr<nsPIDOMWindowInner> mParent;
      64             : 
      65           0 :   struct KeyStatus {
      66           0 :     KeyStatus(const nsTArray<uint8_t>& aKeyId,
      67             :               MediaKeyStatus aStatus)
      68           0 :       : mKeyId(aKeyId)
      69           0 :       , mStatus(aStatus)
      70             :     {
      71           0 :     }
      72           0 :     bool operator== (const KeyStatus& aOther) const {
      73           0 :       return aOther.mKeyId == mKeyId;
      74             :     }
      75           0 :     bool operator<(const KeyStatus& aOther) const {
      76             :       // Copy chromium and compare keys' bytes.
      77             :       // Update once https://github.com/w3c/encrypted-media/issues/69
      78             :       // is resolved.
      79           0 :       const nsTArray<uint8_t>& other = aOther.mKeyId;
      80           0 :       const nsTArray<uint8_t>& self = mKeyId;
      81           0 :       size_t length = std::min<size_t>(other.Length(), self.Length());
      82           0 :       int cmp = memcmp(self.Elements(), other.Elements(), length);
      83           0 :       if (cmp != 0) {
      84           0 :         return cmp < 0;
      85             :       }
      86           0 :       return self.Length() <= other.Length();
      87             :     }
      88             :     nsTArray<uint8_t> mKeyId;
      89             :     MediaKeyStatus mStatus;
      90             :   };
      91             : 
      92             :   nsTArray<KeyStatus> mStatuses;
      93             : };
      94             : 
      95             : } // namespace dom
      96             : } // namespace mozilla
      97             : 
      98             : #endif