SquirrelJME/SquirrelJME

// -*- Mode: Java; indent-tabs-mode: t; tab-width: 4 -*-
// ---------------------------------------------------------------------------
// Multi-Phasic Applications: SquirrelJME
//     Copyright (C) Stephanie Gawroriski <xer@multiphasicapps.net>
// ---------------------------------------------------------------------------
// SquirrelJME is under the Mozilla Public License Version 2.0.
// See license.mkd for licensing and copyright information.
// ---------------------------------------------------------------------------

package cc.squirreljme.vm.nanocoat;

import cc.squirreljme.emulator.NativeBinding;
import cc.squirreljme.emulator.vm.VMException;
import java.io.IOException;
import java.nio.file.Path;

/**
 * Native library loader.
 *
 * @since 2023/12/05
 */
final class __Native__
{
    /** The path where the library exists. */
    private static volatile Path _libPath;
    
    /**
     * Binds methods accordingly.
     *
     * @since 2023/12/05
     */
    private static native int __bindMethods();
    
    /**
     * Loads the native library.
     *
     * @throws VMException On read/write errors.
     * @return The path to the library, where it exists on disk.
     * @since 2023/12/05
     */
    static Path __loadLibrary()
        throws VMException
    {
        synchronized (__Native__.class)
        {
            if (__Native__._libPath == null)
            {
                // Load in library accordingly
                try
                {
                    __Native__._libPath = NativeBinding.libFromResources(
                        "emulator-nanocoat", true);
                }
                catch (IOException e)
                {
                    throw new VMException("Could not load library.", e);
                }
                
                // Load and initialize
                System.load(__Native__._libPath.toAbsolutePath().toString());
                int err;
                if ((err = __Native__.__bindMethods()) != 0)
                    throw new VMException(String.format(
                        "Native binding failed: %d.", err));
            }
            
            return __Native__._libPath;
        }
    }
}