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/*
* Copyright (C) 2011 Klaus Reimer <k@ailis.de>
* See LICENSE.md for licensing information.
*/
package org.usb4java;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URISyntaxException;
import java.net.URL;
/**
* Utility class to load native libraries from classpath.
*
* @author Klaus Reimer (k@ailis.de)
*/
public final class Loader
{
/** Buffer size used for copying data. */
private static final int BUFFER_SIZE = 8192;
/** The temporary directory for native libraries. */
private static File tmp;
/** If library is already loaded. */
private static boolean loaded = false;
/**
* Private constructor to prevent instantiation.
*/
private Loader()
{
// Nothing to do here
}
/**
* Returns the operating system name. This could be "linux", "windows" or
* "macos" or (for any other non-supported platform) the value of the
* "os.name" property converted to lower case and with removed space
* characters.
*
* @return The operating system name.
*/
private static String getOS()
{
final String os = System.getProperty("os.name").toLowerCase()
.replace(" ", "");
if (os.contains("windows"))
{
return "win32";
}
if (os.equals("macosx") || os.equals("macos"))
{
return "darwin";
}
return os;
}
/**
* Returns the CPU architecture. This will be "x86" or "x86_64" (Platform
* names i386 und amd64 are converted accordingly) or (when platform is
* unsupported) the value of os.arch converted to lower-case and with
* removed space characters.
*
* @return The CPU architecture
*/
private static String getArch()
{
final String arch = System.getProperty("os.arch").toLowerCase()
.replace(" ", "");
if (arch.equals("i386"))
{
return "x86";
}
if (arch.equals("amd64") || arch.equals("x86_64"))
{
return "x86-64";
}
if (arch.equals("arm64"))
{
return "aarch64";
}
if (arch.equals("armhf") || arch.equals("aarch32") || arch.equals("armv7l"))
{
return "arm";
}
return arch;
}
/**
* Returns the shared library extension name.
*
* @return The shared library extension name.
*/
private static String getExt()
{
final String os = getOS();
final String key = "usb4java.libext." + getOS();
final String ext = System.getProperty(key);
if (ext != null)
{
return ext;
}
if (os.equals("linux") || os.equals("freebsd") || os.equals("sunos"))
{
return "so";
}
if (os.equals("win32"))
{
return "dll";
}
if (os.equals("darwin"))
{
return "dylib";
}
throw new LoaderException("Unable to determine the shared library "
+ "file extension for operating system '" + os
+ "'. Please specify Java parameter -D" + key
+ "=<FILE-EXTENSION>");
}
/**
* Creates the temporary directory used for unpacking the native libraries.
* This directory is marked for deletion on exit.
*
* @return The temporary directory for native libraries.
*/
private static File createTempDirectory()
{
// Return cached tmp directory when already created
if (tmp != null)
{
return tmp;
}
try
{
tmp = File.createTempFile("usb4java", null);
if (!tmp.delete())
{
throw new IOException("Unable to delete temporary file " + tmp);
}
if (!tmp.mkdirs())
{
throw new IOException("Unable to create temporary directory "
+ tmp);
}
tmp.deleteOnExit();
return tmp;
}
catch (final IOException e)
{
throw new LoaderException("Unable to create temporary directory "
+ "for usb4java natives: " + e, e);
}
}
/**
* Returns the platform name. This could be for example "linux-x86" or
* "windows-x86_64".
*
* @return The architecture name. Never null.
*/
private static String getPlatform()
{
return getOS() + "-" + getArch();
}
/**
* Returns the name of the usb4java native library. This could be
* "libusb4java.dll" for example.
*
* @return The usb4java native library name. Never null.
*/
private static String getLibName()
{
return "libusb4java." + getExt();
}
/**
* Returns the name of the libusb native library. This could be
* "libusb0.dll" for example or null if this library is not needed on the
* current platform (Because it is provided by the operating system or
* statically linked into the libusb4java library).
*
* @return The libusb native library name or null if not needed.
*/
private static String getExtraLibName()
{
return null;
}
/**
* Copies the specified input stream to the specified output file.
*
* @param input
* The input stream.
* @param output
* The output file.
* @throws IOException
* If copying failed.
*/
private static void copy(final InputStream input, final File output)
throws IOException
{
final byte[] buffer = new byte[BUFFER_SIZE];
final FileOutputStream stream = new FileOutputStream(output);
try
{
int read;
while ((read = input.read(buffer)) != -1)
{
stream.write(buffer, 0, read);
}
}
finally
{
stream.close();
}
}
/**
* Extracts a single library.
*
* @param platform
* The platform name (For example "linux-x86")
* @param lib
* The library name to extract (For example "libusb0.dll")
* @return The absolute path to the extracted library.
*/
private static String extractLibrary(final String platform,
final String lib)
{
// Extract the usb4java library
final String source = '/'
+ Loader.class.getPackage().getName().replace('.', '/') + '/'
+ platform + "/" + lib;
// Check if native library is present
final URL url = Loader.class.getResource(source);
if (url == null)
{
throw new LoaderException("Native library not found in classpath: "
+ source);
}
// If native library was found in an already extracted form then
// return this one without extracting it
if ("file".equals(url.getProtocol()))
{
try
{
return new File(url.toURI()).getAbsolutePath();
}
catch (final URISyntaxException e)
{
// Can't happen because we are not constructing the URI
// manually. But even when it happens then we fall back to
// extracting the library.
throw new LoaderException(e.toString(), e);
}
}
// Extract the library and return the path to the extracted file.
final File dest = new File(createTempDirectory(), lib);
try
{
final InputStream stream = Loader.class.getResourceAsStream(source);
if (stream == null)
{
throw new LoaderException("Unable to find " + source
+ " in the classpath");
}
try
{
copy(stream, dest);
}
finally
{
stream.close();
}
}
catch (final IOException e)
{
throw new LoaderException("Unable to extract native library "
+ source + " to " + dest + ": " + e, e);
}
// Mark usb4java library for deletion
dest.deleteOnExit();
return dest.getAbsolutePath();
}
/**
* Loads the libusb native wrapper library. Can be safely called multiple
* times. Duplicate calls are ignored. This method is automatically called
* when the {@link LibUsb} class is loaded. When you need to do it earlier
* (To catch exceptions for example) then simply call this method manually.
*
* @throws LoaderException
* When loading the native wrapper libraries failed.
*/
public static synchronized void load()
{
// Do nothing if already loaded (or still loading)
if (loaded)
{
return;
}
loaded = true;
final String platform = getPlatform();
final String lib = getLibName();
final String extraLib = getExtraLibName();
if (extraLib != null)
{
System.load(extractLibrary(platform, extraLib));
}
System.load(extractLibrary(platform, lib));
}
}
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