101 lines
3.2 KiB
Java
101 lines
3.2 KiB
Java
/*
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* Copyright 2016 dorkbox, llc
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package dorkbox.util;
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import java.io.File;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.OutputStream;
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import java.security.AccessController;
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import java.security.PrivilegedAction;
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import dorkbox.os.OS;
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/**
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* Loads the specified library, extracting it from the jar, if necessary
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*/
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public
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class NativeLoader {
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public static
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File extractLibrary(final String sourceFileName, final String destinationDirectory, final String destinationName, String version) throws IOException {
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try {
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String suffix = OS.INSTANCE.getType().getLibraryNames()[0];
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final String outputFileName;
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if (version == null) {
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outputFileName = destinationName + suffix;
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}
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else {
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outputFileName = destinationName + "." + version + suffix;
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}
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final File file = new File(destinationDirectory, outputFileName);
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if (!file.canRead() || file.length() == 0 || !file.canExecute()) {
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// now we copy it out
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final InputStream inputStream = LocationResolver.getResourceAsStream(sourceFileName);
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OutputStream outStream = null;
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try {
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outStream = new FileOutputStream(file);
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byte[] buffer = new byte[4096];
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int read;
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while ((read = inputStream.read(buffer)) > 0) {
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outStream.write(buffer, 0, read);
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}
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outStream.flush();
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outStream.close();
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outStream = null;
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} finally {
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try {
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inputStream.close();
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} catch (Exception ignored) {
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}
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try {
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if (outStream != null) {
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outStream.close();
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}
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} catch (Exception ignored) {
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}
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}
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}
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return file;
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} catch (Exception e) {
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throw new IOException("Error extracting library: " + sourceFileName, e);
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}
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}
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public static
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void loadLibrary(final File file) {
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// inject into the correct classloader
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AccessController.doPrivileged(new PrivilegedAction<Object>() {
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@Override
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public
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Object run() {
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System.load(file.getAbsolutePath());
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return null;
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}
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});
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}
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private
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NativeLoader() {
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}
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}
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