Many resources are needed to download a project. Please understand that we have to compensate our server costs. Thank you in advance. Project price only 1 $
You can buy this project and download/modify it how often you want.
package com.diozero.ws281xj.rpiws281x;
/*-
* #%L
* Organisation: diozero
* Project: diozero - WS281x Java Wrapper
* Filename: LibraryUtil.java
*
* This file is part of the diozero project. More information about this project
* can be found at https://www.diozero.com/.
* %%
* Copyright (C) 2016 - 2022 diozero
* %%
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
* #L%
*/
import java.io.InputStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.StandardCopyOption;
public class LibraryUtil {
private static final String OS_NAME = System.getProperty("os.name").replace(" ", "").toLowerCase();
private static String OS_ARCH = System.getProperty("os.arch").toLowerCase();
private static final String LINUX_CPUINFO_FILE = "/proc/cpuinfo";
private static final String ARMV6_CPU_MODEL_NAME = "armv6";
private static final String ARMV7_CPU_MODEL_NAME = "armv7";
public static String getCpuArch() {
String cpu_arch = OS_ARCH;
try {
Path path = Paths.get(LINUX_CPUINFO_FILE);
if (path.toFile().exists() && path.toFile().canRead()) {
// Determine if this is ARMv6 or ARMv7
cpu_arch = Files.lines(path).filter(line -> line.startsWith("model name"))
.map(line -> line.split(":")[1].trim().split("[- ]")[0].trim().toLowerCase())
.filter(cpu_model -> cpu_model.equals(ARMV6_CPU_MODEL_NAME)
|| cpu_model.equals(ARMV7_CPU_MODEL_NAME))
.findFirst().orElse(OS_ARCH);
// Just in case - fall back to ARMv6
if (cpu_arch.equals("arm")) {
cpu_arch = ARMV6_CPU_MODEL_NAME;
}
}
} catch (Throwable t) {
// Ignore
}
return cpu_arch;
}
public static String getLibExt() {
// TODO Check if this is comprehensive
switch (OS_NAME) {
case "macosx":
return "dylib";
case "win":
return "dll";
default:
return "so";
}
}
public static boolean loadLibrary(String libName, Class clz) {
boolean loaded = false;
// First try loading from the Java system library path (-Djava.library.path) to
// allow the bundled libraries to be overridden
try {
System.loadLibrary(libName);
loaded = true;
} catch (Throwable t) {
// Ignore
}
// If not found, load the appropriate library for this CPU architecture
if (!loaded) {
String lib_ext = getLibExt();
String lib_resource_name = String.format("/lib/%s-%s/lib%s.%s", OS_NAME, getCpuArch(), libName, lib_ext);
try (InputStream is = clz.getResourceAsStream(lib_resource_name)) {
if (is == null) {
System.err.println("Error: unable to find '" + lib_resource_name + "' in the JAR file");
} else {
Path path = Files.createTempFile("lib" + libName, lib_ext);
path.toFile().deleteOnExit();
Files.copy(is, path, StandardCopyOption.REPLACE_EXISTING);
Runtime.getRuntime().load(path.toString());
loaded = true;
path.toFile().delete();
}
} catch (Throwable t) {
System.err.println("Error loading library from classpath '" + lib_resource_name + "': " + t);
}
}
return loaded;
}
}
