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