// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef MOJO_EDK_EMBEDDER_PLATFORM_SUPPORT_H_
#define MOJO_EDK_EMBEDDER_PLATFORM_SUPPORT_H_

#include <stddef.h>

#include "mojo/edk/platform/scoped_platform_handle.h"
#include "mojo/edk/util/ref_ptr.h"
#include "mojo/public/cpp/system/macros.h"

namespace mojo {

namespace platform {
class PlatformSharedBuffer;
}

namespace embedder {

// This class is provided by the embedder to implement (typically
// platform-dependent) things needed by the Mojo system implementation.
// Implementations must be thread-safe.
class PlatformSupport {
 public:
  virtual ~PlatformSupport() {}

  // Gets cryptographically-secure (pseudo)random bytes.
  virtual void GetCryptoRandomBytes(void* bytes, size_t num_bytes) = 0;

  virtual util::RefPtr<platform::PlatformSharedBuffer> CreateSharedBuffer(
      size_t num_bytes) = 0;
  virtual util::RefPtr<platform::PlatformSharedBuffer>
  CreateSharedBufferFromHandle(
      size_t num_bytes,
      platform::ScopedPlatformHandle platform_handle) = 0;

 protected:
  PlatformSupport() {}

 private:
  MOJO_DISALLOW_COPY_AND_ASSIGN(PlatformSupport);
};

}  // namespace embedder
}  // namespace mojo

#endif  // MOJO_EDK_EMBEDDER_PLATFORM_SUPPORT_H_