/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 GMPUtils_h_
#define GMPUtils_h_

#include "mozilla/AbstractThread.h"
#include "mozilla/RefPtr.h"
#include "mozilla/UniquePtr.h"
#include "nsCOMPtr.h"
#include "nsClassHashtable.h"
#include "nsStringFwd.h"
#include "nsTArray.h"

#define CHROMIUM_CDM_API_BACKWARD_COMPAT "chromium-cdm9-host4"
#define CHROMIUM_CDM_API "chromium-cdm10-host4"

class nsIFile;
class nsIDirectoryEnumerator;

namespace mozilla {

template <typename T>
struct DestroyPolicy {
  void operator()(T* aGMPObject) const { aGMPObject->Destroy(); }
};

template <typename T>
using GMPUniquePtr = mozilla::UniquePtr<T, DestroyPolicy<T>>;

void SplitAt(const char* aDelims, const nsACString& aInput,
             nsTArray<nsCString>& aOutTokens);

nsCString ToHexString(const nsTArray<uint8_t>& aBytes);

nsCString ToHexString(const uint8_t* aBytes, uint32_t aLength);

bool FileExists(nsIFile* aFile);

// Enumerate directory entries for a specified path.
class DirectoryEnumerator {
 public:
  enum Mode {
    DirsOnly,     // Enumeration only includes directories.
    FilesAndDirs  // Enumeration includes directories and non-directory files.
  };

  DirectoryEnumerator(nsIFile* aPath, Mode aMode);

  already_AddRefed<nsIFile> Next();

 private:
  Mode mMode;
  nsCOMPtr<nsIDirectoryEnumerator> mIter;
};

class GMPInfoFileParser {
 public:
  bool Init(nsIFile* aFile);
  bool Contains(const nsCString& aKey) const;
  nsCString Get(const nsCString& aKey) const;

 private:
  nsClassHashtable<nsCStringHashKey, nsCString> mValues;
};

bool ReadIntoString(nsIFile* aFile, nsCString& aOutDst, size_t aMaxLength);

bool HaveGMPFor(const nsACString& aAPI, const nsTArray<nsCString>& aTags);

void LogToConsole(const nsAString& aMsg);

already_AddRefed<nsISerialEventTarget> GetGMPThread();

// Returns the number of bytes required to store an aWidth x aHeight image in
// I420 format, padded so that the width and height are multiples of 16.
size_t I420FrameBufferSizePadded(int32_t aWidth, int32_t aHeight);

}  // namespace mozilla

#endif