NativeLoaderExtension.java

package net.superblaubeere27.masxinlingvaj.postprocessor.extensions;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;

public class NativeLoaderExtension {

    private static final Object NATIVE_LOADER_LOCK = new Object();
    private static boolean NATIVES_LOADED = false;

    /**
     * Handles native-loading for the finished jars
     */
    public static void loadNatives() throws IOException {
        synchronized (NATIVE_LOADER_LOCK) {
            if (NATIVES_LOADED)
                return;

            boolean isX64 = System.getProperty("os.arch").contains("64");
            String lowerCase = System.getProperty("os.name").toLowerCase();

            String name = null;

            if (isX64) {
                if (lowerCase.contains("win")) {
                    name = "mlv-win64.dll";
                }
                if (lowerCase.contains("linux")) {
                    name = "mlv-linux64.so";
                }
                if (lowerCase.contains("mac")) {
                    name = "mlv-macosx.dylib";
                }
            }

            if (name == null) {
                throw new Error("No natives found for " + lowerCase + (isX64 ? " x86-64" : "x86"));
            }

            var tmpFile = File.createTempFile("mlv_", ".tmp");

            try (
                    InputStream inputStream = NativeLoaderExtension.class.getResourceAsStream("/META-INF/natives/" + name);
                    FileOutputStream fos = new FileOutputStream(tmpFile)
            ) {
                byte[] buf = new byte[1024];
                int read;

                while ((read = inputStream.read(buf)) != -1) {
                    fos.write(buf, 0, read);
                }
            } catch (IOException e) {
                throw new Error("Failed to load natives", e);
            }

            System.load(tmpFile.getAbsolutePath());

            NATIVES_LOADED = true;
        }
    }

}