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jMonkeyEngine is a 3-D game engine for adventurous Java developers
/*
* Copyright (c) 2009-2023 jMonkeyEngine
* 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 'jMonkeyEngine' 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
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.jme3.system;
import java.io.*;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.nio.file.StandardCopyOption;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;
import com.jme3.util.res.Resources;
/**
* Utility class to register, extract, and load native libraries.
*
* Register your own libraries via the {@link #registerNativeLibrary(String, Platform, String, String)} method, for
* each platform.
* You can then extract this library (depending on platform), by
* using {@link #loadNativeLibrary(java.lang.String, boolean) }.
*
* Example:
*
* NativeLibraryLoader.registerNativeLibrary("mystuff", Platform.Windows32, "native/windows/mystuff.dll");
* NativeLibraryLoader.registerNativeLibrary("mystuff", Platform.Windows64, "native/windows/mystuff64.dll");
* NativeLibraryLoader.registerNativeLibrary("mystuff", Platform.Linux32, "native/linux/libmystuff.so");
* NativeLibraryLoader.registerNativeLibrary("mystuff", Platform.Linux64, "native/linux/libmystuff64.so");
* NativeLibraryLoader.registerNativeLibrary("mystuff", Platform.MacOSX32, "native/macosx/libmystuff.jnilib");
* NativeLibraryLoader.registerNativeLibrary("mystuff", Platform.MacOSX64, "native/macosx/libmystuff.jnilib");
*
*
* This will register the library. Load it via:
*
* NativeLibraryLoader.loadNativeLibrary("mystuff", true);
*
* It will load the right library automatically based on the platform.
*
* @author Kirill Vainer
*/
public final class NativeLibraryLoader {
private static final Logger logger = Logger.getLogger(NativeLibraryLoader.class.getName());
private static File extractionFolderOverride = null;
private static File extractionFolder = null;
private static final HashMap nativeLibraryMap = new HashMap<>();
static {
NativeLibraries.registerDefaultLibraries();
}
/**
* Register a new native library.
*
* This simply registers a known library, the actual extraction and loading
* is performed by calling {@link #loadNativeLibrary(java.lang.String, boolean) }.
*/
public static void registerNativeLibrary(NativeLibrary library) {
nativeLibraryMap.put(library.getKey(), library);
}
/**
* Register a new native library.
*
* This simply registers a known library, the actual extraction and loading
* is performed by calling {@link #loadNativeLibrary(java.lang.String, boolean) }.
*
* @param name The name / ID of the library (not OS or architecture specific).
* @param platform The platform for which the in-natives-jar path has
* been specified for.
* @param path The path inside the natives-jar or classpath
* corresponding to this library. Must be compatible with the platform
* argument.
* @param extractAsName The filename that the library should be extracted as,
* if null, use the same name as in the path.
*/
public static void registerNativeLibrary(String name, Platform platform,
String path, String extractAsName) {
nativeLibraryMap.put(new NativeLibrary.Key(name, platform),
new NativeLibrary(name, platform, path, extractAsName));
}
/**
* Register a new native library.
*
* This simply registers a known library, the actual extraction and loading
* is performed by calling {@link #loadNativeLibrary(java.lang.String, boolean) }.
*
* This method should be called several times for each library name,
* each time specifying a different platform + path combination.
*
* @param name The name / ID of the library (not OS or architecture specific).
* @param platform The platform for which the in-natives-jar path has
* been specified for.
* @param path The path inside the natives-jar or classpath
* corresponding to this library. Must be compatible with the platform
* argument.
*/
public static void registerNativeLibrary(String name, Platform platform,
String path) {
registerNativeLibrary(name, platform, path, null);
}
private NativeLibraryLoader() {
}
/**
* Determines whether native Bullet is on the classpath.
*
* Currently, the context extracts the native Bullet libraries, so
* this method is needed to determine if they are needed.
* Ideally, native Bullet would be responsible for its own natives.
*
* @return True native bullet is on the classpath, false otherwise.
*/
public static boolean isUsingNativeBullet() {
try {
Class clazz = Class.forName("com.jme3.bullet.util.NativeMeshUtil");
return clazz != null;
} catch (ClassNotFoundException ex) {
return false;
}
}
/**
* Specify a custom location where native libraries should
* be extracted to. Ensure this is a unique path not used
* by other applications to extract their libraries.
* Set to null to restore default
* functionality.
*
* @param path Path where to extract native libraries.
*/
public static void setCustomExtractionFolder(String path) {
extractionFolderOverride = new File(path).getAbsoluteFile();
}
/**
* Returns the folder where native libraries will be extracted.
* This is automatically determined at run-time based on the
* following criteria:
*
* - If a {@link #setCustomExtractionFolder(java.lang.String) custom
* extraction folder} has been specified, it is returned.
*
- If the user can write to "java.io.tmpdir" folder, then it
* is used.
* - Otherwise, the {@link JmeSystem#getStorageFolder() storage folder}
* is used, to prevent collisions, a special subfolder is used
* called
natives_<hash> where <hash>
* is computed automatically as the XOR of the classpath hash code
* and the last modified date of this class.
*
*
* @return Path where natives will be extracted to.
*/
public static File getExtractionFolder() {
if (extractionFolderOverride != null) {
return extractionFolderOverride;
}
if (extractionFolder == null) {
File userTempDir = new File(System.getProperty("java.io.tmpdir"));
if (!userTempDir.canWrite()) {
setExtractionFolderToUserCache();
} else {
try {
File jmeTempDir = new File(userTempDir, "jme3");
if (!jmeTempDir.exists()) {
jmeTempDir.mkdir();
}
extractionFolder = new File(jmeTempDir, "natives_" + Integer.toHexString(computeNativesHash()));
if (!extractionFolder.exists()) {
extractionFolder.mkdir();
}
} catch (Exception e) {
setExtractionFolderToUserCache();
}
}
}
return extractionFolder;
}
/**
* Determine jME3's cache folder for the user account based on the OS.
*
* If the OS cache folder is missing, the assumption is that this
* particular version of the OS does not have a dedicated cache folder,
* hence, we use the user's home folder instead as the root.
*
* The folder returned is as follows:
*
* - Windows: ~\AppData\Local\jme3
* - Mac OS X: ~/Library/Caches/jme3
* - Linux: ~/.cache/jme3
*
*
* @return the user cache folder.
*/
private static File getJmeUserCacheFolder() {
File userHomeFolder = new File(System.getProperty("user.home"));
File userCacheFolder = null;
switch (JmeSystem.getPlatform().getOs()) {
case Linux:
userCacheFolder = new File(userHomeFolder, ".cache");
break;
case MacOS:
userCacheFolder = new File(new File(userHomeFolder, "Library"), "Caches");
break;
case Windows:
userCacheFolder = new File(new File(userHomeFolder, "AppData"), "Local");
break;
}
if (userCacheFolder == null || !userCacheFolder.exists()) {
// Fallback to home directory if cache folder is missing
return new File(userHomeFolder, ".jme3");
}
return new File(userCacheFolder, "jme3");
}
private static void setExtractionFolderToUserCache() {
File extractFolderInHome = getJmeUserCacheFolder();
if (!extractFolderInHome.exists()) {
extractFolderInHome.mkdir();
}
extractionFolder = new File(extractFolderInHome, "natives_" + Integer.toHexString(computeNativesHash()));
if (!extractionFolder.exists()) {
extractionFolder.mkdir();
}
logger.log(Level.WARNING, "Working directory is not writable. "
+ "Natives will be extracted to:\n{0}",
extractionFolder);
}
private static int computeNativesHash() {
URLConnection conn = null;
String classpath = System.getProperty("java.class.path");
URL url = Resources.getResource("com/jme3/system/NativeLibraryLoader.class");
try {
StringBuilder sb = new StringBuilder(url.toString());
if (sb.indexOf("jar:") == 0) {
sb.delete(0, 4);
sb.delete(sb.indexOf("!"), sb.length());
sb.delete(sb.lastIndexOf("/") + 1, sb.length());
}
try {
url = new URL(sb.toString());
} catch (MalformedURLException ex) {
throw new UnsupportedOperationException(ex);
}
conn = url.openConnection();
int hash = classpath.hashCode() ^ (int) conn.getLastModified();
return hash;
} catch (IOException ex) {
throw new UncheckedIOException("Failed to open file: '" + url
+ "'. Error: " + ex, ex);
} finally {
if (conn != null) {
try {
conn.getInputStream().close();
conn.getOutputStream().close();
} catch (IOException ex) { }
}
}
}
public static File[] getJarsWithNatives() {
HashSet jarFiles = new HashSet<>();
for (Map.Entry lib : nativeLibraryMap.entrySet()) {
File jarFile = getJarForNativeLibrary(lib.getValue().getPlatform(), lib.getValue().getName());
if (jarFile != null) {
jarFiles.add(jarFile);
}
}
return jarFiles.toArray(new File[0]);
}
public static void extractNativeLibraries(Platform platform, File targetDir) throws IOException {
for (Map.Entry lib : nativeLibraryMap.entrySet()) {
if (lib.getValue().getPlatform() == platform) {
if (!targetDir.exists()) {
targetDir.mkdirs();
}
extractNativeLibrary(platform, lib.getValue().getName(), targetDir);
}
}
}
/**
* Removes platform-specific portions of a library file name so
* that it can be accepted by {@link System#loadLibrary(java.lang.String) }.
*
* E.g.
*
* - jinput-dx8_64.dll => jinput-dx8_64
* - liblwjgl64.so => lwjgl64
* - libopenal.so => openal
*
*
* @param filename The filename to strip platform-specific parts
* @return The stripped library name
*/
private static String unmapLibraryName(String filename) {
StringBuilder sb = new StringBuilder(filename);
if (sb.indexOf("lib") == 0 && !filename.toLowerCase().endsWith(".dll")) {
sb.delete(0, 3);
}
int dot = sb.lastIndexOf(".");
if (dot > 0) {
sb.delete(dot, sb.length());
}
return sb.toString();
}
public static File getJarForNativeLibrary(Platform platform, String name) {
NativeLibrary library = nativeLibraryMap.get(new NativeLibrary.Key(name, platform));
if (library == null) {
return null;
}
String pathInJar = library.getPathInNativesJar();
if (pathInJar == null) {
return null;
}
String fileNameInJar;
if (pathInJar.contains("/")) {
fileNameInJar = pathInJar.substring(pathInJar.lastIndexOf("/") + 1);
} else {
fileNameInJar = pathInJar;
}
URL url = Resources.getResource(pathInJar);
if (url == null) {
url = Resources.getResource(fileNameInJar);
}
if (url == null) {
return null;
}
StringBuilder sb = new StringBuilder(url.toString());
if (sb.indexOf("jar:file:/") == 0) {
sb.delete(0, 9);
sb.delete(sb.indexOf("!"), sb.length());
return new File(sb.toString());
} else {
return null; // not a jar
}
}
public static void extractNativeLibrary(Platform platform, String name, File targetDir) throws IOException {
NativeLibrary library = nativeLibraryMap.get(new NativeLibrary.Key(name, platform));
if (library == null) {
return;
}
String pathInJar = library.getPathInNativesJar();
if (pathInJar == null) {
return;
}
URL url = Resources.getResource(pathInJar);
if (url == null) {
return;
}
String loadedAsFileName;
if (library.getExtractedAsName() != null) {
loadedAsFileName = library.getExtractedAsName();
} else {
loadedAsFileName = Paths.get(pathInJar).getFileName().toString();
}
URLConnection conn = url.openConnection();
File targetFile = new File(targetDir, loadedAsFileName);
try (InputStream in = conn.getInputStream()) {
Files.copy(in, targetFile.toPath(), StandardCopyOption.REPLACE_EXISTING);
targetFile.setLastModified(conn.getLastModified());
}
}
/**
* First extracts the native library and then loads it.
*
* @param name The name of the library to load.
* @param isRequired If true and the library fails to load, throw exception. If
* false, do nothing if it fails to load.
*/
public static void loadNativeLibrary(String name, boolean isRequired) {
if (JmeSystem.isLowPermissions()) {
throw new UnsupportedOperationException("JVM is running under "
+ "reduced permissions. Cannot load native libraries.");
}
Platform platform = JmeSystem.getPlatform();
NativeLibrary library = nativeLibraryMap.get(new NativeLibrary.Key(name, platform));
if (library == null) {
// No library exists for this platform.
if (isRequired) {
throw new UnsatisfiedLinkError(
"The required native library '" + name + "'"
+ " is not available for your OS: " + platform);
} else {
if (logger.isLoggable(Level.FINE)) {
logger.log(Level.FINE, "The optional native library ''{0}''" +
" is not available for your OS: {1}",
new Object[]{name, platform});
}
return;
}
}
final String pathInJar = library.getPathInNativesJar();
if (pathInJar == null) {
// This platform does not require the native library to be loaded.
return;
}
URL url = Resources.getResource(pathInJar);
if (url == null) {
if (isRequired) {
throw new UnsatisfiedLinkError(
"The required native library '" + library.getName() + "'"
+ " was not found in the classpath via '" + pathInJar);
} else if (logger.isLoggable(Level.FINE)) {
logger.log(Level.FINE, "The optional native library ''{0}''" +
" was not found in the classpath via ''{1}''.",
new Object[]{library.getName(), pathInJar});
}
return;
}
// The library has been found and is ready to be extracted.
// Determine what filename it should be extracted as.
String loadedAsFileName;
if (library.getExtractedAsName() != null) {
loadedAsFileName = library.getExtractedAsName();
} else {
// Just use the original filename as it is in the JAR.
loadedAsFileName = Paths.get(pathInJar).getFileName().toString();
}
File extractionDirectory = getExtractionFolder();
URLConnection conn;
try {
conn = url.openConnection();
} catch (IOException ex) {
// Maybe put more detail here? Not sure.
throw new UncheckedIOException("Failed to open file: '" + url +
"'. Error: " + ex, ex);
}
File targetFile = new File(extractionDirectory, loadedAsFileName);
try (InputStream in = conn.getInputStream()) {
if (isExtractingRequired(conn, targetFile)) {
Files.copy(in, targetFile.toPath(), StandardCopyOption.REPLACE_EXISTING);
// NOTE: On OSes that support "Date Created" property,
// this will cause the last modified date to be lower than
// date created which makes no sense
targetFile.setLastModified(conn.getLastModified());
if (logger.isLoggable(Level.FINE)) {
logger.log(Level.FINE, "Extracted native library from ''{0}'' into ''{1}''. ",
new Object[]{url, targetFile});
}
} else {
if (logger.isLoggable(Level.FINE)) {
logger.log(Level.FINE, "Not copying library {0}. Latest already extracted.",
loadedAsFileName);
}
}
library.getLoadFunction().accept(targetFile.getAbsolutePath());
if (logger.isLoggable(Level.FINE)) {
logger.log(Level.FINE, "Loaded native library {0}.", library.getName());
}
} catch (IOException ex) {
/*if (ex.getMessage().contains("used by another process")) {
return;
}*/
throw new UncheckedIOException("Failed to extract native library to: "
+ targetFile, ex);
}
}
/**
* Checks if library extraction is required by comparing source and target
* last modified date. Returns true if target file does not exist.
*
* @param conn the source file
* @param targetFile the target file
* @return false if target file exist and the difference in last modified date is
* less than 1 second, true otherwise
*/
private static boolean isExtractingRequired(URLConnection conn, File targetFile) {
if (!targetFile.exists()) {
// Extract anyway if the file doesn't exist
return true;
}
// OK, if the file exists then compare last modified date
// of this file to file in jar
long targetLastModified = targetFile.lastModified();
long sourceLastModified = conn.getLastModified();
// Allow ~1 second range for OSes that only support low precision
return Math.abs(sourceLastModified - targetLastModified) >= 1000;
// Note extraction should also work fine if user who was using
// a newer version of library, downgraded to an older version
// which will make above check invalid and extract it again.
}
}
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