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/*
* Copyright 2009 - 2010 JogAmp Community. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are
* permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this list of
* conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice, this list
* of conditions and the following disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY JogAmp Community ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JogAmp Community OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* The views and conclusions contained in the software and documentation are those of the
* authors and should not be interpreted as representing official policies, either expressed
* or implied, of JogAmp Community.
*/
package com.jogamp.opencl;
import java.lang.reflect.Field;
import java.nio.Buffer;
import sun.misc.Unsafe;
/**
*
* @author Michael Bien
*/
class InternalBufferUtil {
private static final long addressFieldOffset;
private static Unsafe unsafe;
static {
try {
final Field f = Buffer.class.getDeclaredField("address");
final Field[] fields = Unsafe.class.getDeclaredFields();
for (int i = 0; i < fields.length; i++) {
if (fields[i].getName().equals("theUnsafe")) {
fields[i].setAccessible(true);
unsafe = (Unsafe)fields[i].get(Unsafe.class);
break;
}
}
addressFieldOffset = unsafe.objectFieldOffset(f);
} catch (final Exception e) {
throw new RuntimeException(e);
}
}
public static long getDirectBufferAddress(final Buffer buffer) {
return ((buffer == null) ? 0 : unsafe.getLong(buffer, addressFieldOffset));
}
}
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