/*
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/*
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* library loader with the ability to load libraries as system resource (e.g. form the current .jar file)
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* library loader with the ability to load libraries as system resource (e.g. form the current .jar file)
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* Copyright (c) 2007-2009, ZTEX e.K.
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* Copyright (c) 2007-2009, ZTEX e.K.
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* http://www.ztex.de
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* http://www.ztex.de
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*
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*
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* This library is covered by the LGPL, read LGPL.txt for details.
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* This library is covered by the LGPL, read LGPL.txt for details.
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*/
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*/
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package ch.ntb.usb;
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package ch.ntb.usb;
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import java.io.*;
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import java.io.*;
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/**
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/**
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* This class allows to load libraries in the normal way or as a system resource.
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* This class allows to load libraries in the normal way or as a system resource (e.g. form the current .jar file).
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* See below for a further description. <br>
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* See below for a further description. <br>
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*
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*
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* @author Stefan Ziegenbalg
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* @author Stefan Ziegenbalg
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*
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*
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*/
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*/
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public class LibLoader {
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public class LibLoader {
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/**
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/**
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* Loads a library. This is done in three steps.<br>
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* Loads a library. This is done in three steps.<br>
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* 1. The library is tried to be load from the path list specified by the java.library.path proterty. <br>
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* 1. The library is tried to be load from the path list specified by the java.library.path property. <br>
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* 2. The library is tried to be load from the currrent directory. <br>
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* 2. The library is tried to be load from the current directory. <br>
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* 3. The library is searched as a system ressource (e.g. in the current .jar file),
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* 3. The library is searched as a system resource (e.g. in the current .jar file),
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* copied to te temporary directory and loaded from there. Afterwards the temporary library is deleted.
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* copied to to temporary directory and loaded from there. Afterwards the temporary library is deleted.
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* The copying is necessary because libraries cant be loeaded directly from .jar files.<br>
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* The copying is necessary because libraries can't be loaded directly from .jar files.<br>
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*
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*
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* @param libName Library name (e.g. usbJava)
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* @param libName Library name (e.g. usbJava)
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*
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*
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* @throws UnsatisfiedLinkError
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* @throws UnsatisfiedLinkError
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*
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*
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*/
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*/
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public static void load( String libName ) {
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public static void load( String libName ) {
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// Step 1: Normal way
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// Step 1: Normal way
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try {
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try {
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System.loadLibrary( libName );
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System.loadLibrary( libName );
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}
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}
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catch ( Throwable e1 ) {
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catch ( Throwable e1 ) {
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// Step 2: From the current directory
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// Step 2: From the current directory
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String basename = System.mapLibraryName( libName );
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String basename = System.mapLibraryName( libName );
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try {
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try {
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System.load( System.getProperty("user.dir") + System.getProperty("file.separator") + basename );
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System.load( System.getProperty("user.dir") + System.getProperty("file.separator") + basename );
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}
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}
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catch ( Throwable e2 ) {
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catch ( Throwable e2 ) {
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// Step 2: As system ressource
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// Step 2: As system ressource
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String libFileName = System.getProperty("java.io.tmpdir") + System.getProperty("file.separator") + basename;
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String libFileName = System.getProperty("java.io.tmpdir") + System.getProperty("file.separator") + basename;
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try {
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try {
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InputStream inputStream = ClassLoader.getSystemResourceAsStream( basename );
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InputStream inputStream = ClassLoader.getSystemResourceAsStream( basename );
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if ( inputStream == null ) {
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if ( inputStream == null ) {
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throw new Exception();
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throw new Exception();
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}
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}
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File libFile = new File( libFileName );
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File libFile = new File( libFileName );
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FileOutputStream outputStream = new FileOutputStream( libFile );
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FileOutputStream outputStream = new FileOutputStream( libFile );
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byte[] buf = new byte[65536];
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byte[] buf = new byte[65536];
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int bytesRead = -1;
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int bytesRead = -1;
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while ( (bytesRead = inputStream.read(buf)) > 0 ) {
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while ( (bytesRead = inputStream.read(buf)) > 0 ) {
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outputStream.write(buf, 0, bytesRead);
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outputStream.write(buf, 0, bytesRead);
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}
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}
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outputStream.close();
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outputStream.close();
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inputStream.close();
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inputStream.close();
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System.load( libFileName );
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System.load( libFileName );
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try {
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try {
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libFile.delete();
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libFile.delete();
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}
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}
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catch (Exception e3) {
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catch (Exception e3) {
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// System.err.println( "Warning: Cannot delete temporary library file `" + libFileName + "'" );
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// System.err.println( "Warning: Cannot delete temporary library file `" + libFileName + "'" );
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}
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}
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}
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}
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catch (Exception e3) {
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catch (Exception e3) {
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throw new UnsatisfiedLinkError ("Library `"+basename+"' cannot be loaded as system resource, from current directory or from java.library.path (java.library.path=" + System.getProperty("java.library.path")+")" );
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throw new UnsatisfiedLinkError ("Library `"+basename+"' cannot be loaded as system resource, from current directory or from java.library.path (java.library.path=" + System.getProperty("java.library.path")+")" );
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}
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}
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}
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}
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}
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}
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}
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}
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}
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}
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