cef/include/wrapper/cef_library_loader.h

// Copyright (c) 2018 Marshall A. Greenblatt. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//    * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//    * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//    * Neither the name of Google Inc. nor the name Chromium Embedded
// Framework nor the names of its contributors may be used to endorse
// or promote products derived from this software without specific prior
// written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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#ifndef CEF_INCLUDE_WRAPPER_CEF_LIBRARY_LOADER_H_
#define CEF_INCLUDE_WRAPPER_CEF_LIBRARY_LOADER_H_
#pragma once

#include "include/base/cef_build.h"

#ifdef __cplusplus
#include <string>

extern "C" {
#endif  // __cplusplus

///
/// Load the CEF library at the specified |path|. Returns true (1) on
/// success and false (0) on failure.
///
int cef_load_library(const char* path);

///
/// Unload the CEF library that was previously loaded. Returns true (1)
/// on success and false (0) on failure.
///
int cef_unload_library(void);

#ifdef __cplusplus
}

#if defined(OS_MAC)

///
/// Scoped helper for loading and unloading the CEF framework library at
/// runtime from the expected location in the app bundle. Loading at runtime
/// instead of linking directly is a requirement of the macOS sandbox
/// implementation.
///
/// Example usage in the main process:
///
/// <pre>
///   #include "include/wrapper/cef_library_loader.h"
///
///   int main(int argc, char* argv[]) {
///     // Dynamically load the CEF framework library.
///     CefScopedLibraryLoader library_loader;
///     if (!library_loader.LoadInMain())
///       return 1;
///
///     // Continue with CEF initialization...
///   }
/// </pre>
///
/// Example usage in the helper process:
///
/// <pre>
///   #include "include/cef_sandbox_mac.h"
///   #include "include/wrapper/cef_library_loader.h"
///
///   int main(int argc, char* argv[]) {
///     // Initialize the macOS sandbox for this helper process.
///     CefScopedSandboxContext sandbox_context;
///     if (!sandbox_context.Initialize(argc, argv))
///       return 1;
///
///     // Dynamically load the CEF framework library.
///     CefScopedLibraryLoader library_loader;
///     if (!library_loader.LoadInHelper())
///       return 1;
///
///     // Continue with CEF initialization...
///   }
/// </pre>
///
class CefScopedLibraryLoader {
 public:
  CefScopedLibraryLoader();

  CefScopedLibraryLoader(const CefScopedLibraryLoader&) = delete;
  CefScopedLibraryLoader& operator=(const CefScopedLibraryLoader&) = delete;

  ~CefScopedLibraryLoader();

  ///
  /// Load the CEF framework in the main process from the expected app
  /// bundle location relative to the executable. Returns true if the
  /// load succeeds.
  ///
  bool LoadInMain() { return Load(false); }

  ///
  /// Load the CEF framework in the helper process from the expected app
  /// bundle location relative to the executable. Returns true if the
  /// load succeeds.
  ///
  bool LoadInHelper() { return Load(true); }

 private:
  bool Load(bool helper);

  bool loaded_;
};

#endif  // defined(OS_MAC)
#endif  // __cplusplus

#endif  // CEF_INCLUDE_WRAPPER_CEF_LIBRARY_LOADER_H_