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// Copyright (c) 2011 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 BASE_NATIVE_LIBRARY_H_
#define BASE_NATIVE_LIBRARY_H_
// This file defines a cross-platform "NativeLibrary" type which represents
// a loadable module.
#include <string>
#include "base/base_export.h"
#include "base/strings/string_piece.h"
#include "build/build_config.h"
#if defined(OS_WIN)
#include <windows.h>
#elif defined(OS_MACOSX)
#import <CoreFoundation/CoreFoundation.h>
#endif // OS_*
namespace base {
class FilePath;
#if defined(OS_WIN)
using NativeLibrary = HMODULE;
#elif defined(OS_MACOSX)
enum NativeLibraryType {
BUNDLE,
DYNAMIC_LIB
};
enum NativeLibraryObjCStatus {
OBJC_UNKNOWN,
OBJC_PRESENT,
OBJC_NOT_PRESENT,
};
struct NativeLibraryStruct {
NativeLibraryType type;
CFBundleRefNum bundle_resource_ref;
NativeLibraryObjCStatus objc_status;
union {
CFBundleRef bundle;
void* dylib;
};
};
using NativeLibrary = NativeLibraryStruct*;
#elif defined(OS_POSIX)
using NativeLibrary = void*;
#endif // OS_*
struct BASE_EXPORT NativeLibraryLoadError {
#if defined(OS_WIN)
NativeLibraryLoadError() : code(0) {}
#endif // OS_WIN
// Returns a string representation of the load error.
std::string ToString() const;
#if defined(OS_WIN)
DWORD code;
#else
std::string message;
#endif // OS_WIN
};
struct BASE_EXPORT NativeLibraryOptions {
NativeLibraryOptions() = default;
NativeLibraryOptions(const NativeLibraryOptions& options) = default;
// If |true|, a loaded library is required to prefer local symbol resolution
// before considering global symbols. Note that this is already the default
// behavior on most systems. Setting this to |false| does not guarantee the
// inverse, i.e., it does not force a preference for global symbols over local
// ones.
bool prefer_own_symbols = false;
};
// Loads a native library from disk. Release it with UnloadNativeLibrary when
// you're done. Returns NULL on failure.
// If |error| is not NULL, it may be filled in on load error.
BASE_EXPORT NativeLibrary LoadNativeLibrary(const FilePath& library_path,
NativeLibraryLoadError* error);
// Loads a native library from disk. Release it with UnloadNativeLibrary when
// you're done. Returns NULL on failure.
// If |error| is not NULL, it may be filled in on load error.
BASE_EXPORT NativeLibrary LoadNativeLibraryWithOptions(
const FilePath& library_path,
const NativeLibraryOptions& options,
NativeLibraryLoadError* error);
#if defined(OS_WIN)
// Loads a native library from disk. Release it with UnloadNativeLibrary when
// you're done.
// This function retrieves the LoadLibrary function exported from kernel32.dll
// and calls it instead of directly calling the LoadLibrary function via the
// import table.
BASE_EXPORT NativeLibrary LoadNativeLibraryDynamically(
const FilePath& library_path);
#endif // OS_WIN
// Unloads a native library.
BASE_EXPORT void UnloadNativeLibrary(NativeLibrary library);
// Gets a function pointer from a native library.
BASE_EXPORT void* GetFunctionPointerFromNativeLibrary(NativeLibrary library,
StringPiece name);
// Returns the full platform specific name for a native library.
// |name| must be ASCII.
// For example:
// "mylib" returns "mylib.dll" on Windows, "libmylib.so" on Linux,
// "libmylib.dylib" on Mac.
BASE_EXPORT std::string GetNativeLibraryName(StringPiece name);
} // namespace base
#endif // BASE_NATIVE_LIBRARY_H_
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