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/*
 * Copyright (c) 2013, 2014, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package com.sun.glass.ui.monocle.util;

import java.nio.ByteBuffer;
import java.security.Permission;

public class C {

    private static Permission permission = new RuntimePermission("loadLibrary.*");

    private static C instance = new C();

    public static C getC() {
        checkPermissions();
        return instance;
    }

    private static void checkPermissions() {
        SecurityManager security = System.getSecurityManager();
        if (security != null) {
            security.checkPermission(permission);
        }
    }

    private C() {
    }

    public static abstract class Structure {
        public final ByteBuffer b;
        public final long p;
        protected Structure() {
            b = ByteBuffer.allocateDirect(sizeof());
            p = getC().GetDirectBufferAddress(b);
        }
        protected Structure(long ptr) {
            b = getC().NewDirectByteBuffer(ptr, sizeof());
            p = ptr;
        }
        public abstract int sizeof();
    }

    public native ByteBuffer NewDirectByteBuffer(long ptr, int size);
    public native long GetDirectBufferAddress(ByteBuffer b);

}