1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2 /* This Source Code Form is subject to the terms of the Mozilla Public
3  * License, v. 2.0. If a copy of the MPL was not distributed with this
4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
5 
6 #ifndef GMPUtils_h_
7 #define GMPUtils_h_
8 
9 #include "mozilla/UniquePtr.h"
10 #include "mozilla/RefPtr.h"
11 #include "mozilla/AbstractThread.h"
12 #include "nsStringFwd.h"
13 #include "nsTArray.h"
14 #include "nsCOMPtr.h"
15 #include "nsClassHashtable.h"
16 
17 #define CHROMIUM_CDM_API_BACKWARD_COMPAT "chromium-cdm9-host4"
18 #define CHROMIUM_CDM_API "chromium-cdm10-host4"
19 
20 class nsIFile;
21 class nsIDirectoryEnumerator;
22 
23 namespace mozilla {
24 
25 template <typename T>
26 struct DestroyPolicy {
operatorDestroyPolicy27   void operator()(T* aGMPObject) const { aGMPObject->Destroy(); }
28 };
29 
30 template <typename T>
31 using GMPUniquePtr = mozilla::UniquePtr<T, DestroyPolicy<T>>;
32 
33 void SplitAt(const char* aDelims, const nsACString& aInput,
34              nsTArray<nsCString>& aOutTokens);
35 
36 nsCString ToHexString(const nsTArray<uint8_t>& aBytes);
37 
38 nsCString ToHexString(const uint8_t* aBytes, uint32_t aLength);
39 
40 bool FileExists(nsIFile* aFile);
41 
42 // Enumerate directory entries for a specified path.
43 class DirectoryEnumerator {
44  public:
45   enum Mode {
46     DirsOnly,     // Enumeration only includes directories.
47     FilesAndDirs  // Enumeration includes directories and non-directory files.
48   };
49 
50   DirectoryEnumerator(nsIFile* aPath, Mode aMode);
51 
52   already_AddRefed<nsIFile> Next();
53 
54  private:
55   Mode mMode;
56   nsCOMPtr<nsIDirectoryEnumerator> mIter;
57 };
58 
59 class GMPInfoFileParser {
60  public:
61   bool Init(nsIFile* aFile);
62   bool Contains(const nsCString& aKey) const;
63   nsCString Get(const nsCString& aKey) const;
64 
65  private:
66   nsClassHashtable<nsCStringHashKey, nsCString> mValues;
67 };
68 
69 bool ReadIntoString(nsIFile* aFile, nsCString& aOutDst, size_t aMaxLength);
70 
71 bool HaveGMPFor(const nsCString& aAPI, nsTArray<nsCString>&& aTags);
72 
73 void LogToConsole(const nsAString& aMsg);
74 
75 RefPtr<AbstractThread> GetGMPAbstractThread();
76 
77 // Returns the number of bytes required to store an aWidth x aHeight image in
78 // I420 format, padded so that the width and height are multiples of 16.
79 size_t I420FrameBufferSizePadded(int32_t aWidth, int32_t aHeight);
80 
81 }  // namespace mozilla
82 
83 #endif
84