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/*
* Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* - Redistribution of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistribution 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.
*
* Neither the name of Sun Microsystems, Inc. or the names of
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* This software is provided "AS IS," without a warranty of any kind. ALL
* EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
* INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
* MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
* ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
* DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR
* ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR
* DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE
* DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
* ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
* SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
*
* You acknowledge that this software is not designed or intended for use
* in the design, construction, operation or maintenance of any nuclear
* facility.
*
* Sun gratefully acknowledges that this software was originally authored
* and developed by Kenneth Bradley Russell and Christopher John Kline.
*/
package com.sun.gluegen.runtime;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.nio.*;
import sun.misc.Unsafe;
public class BufferFactoryInternal {
private static final long addressFieldOffset;
private static final Constructor directByteBufferConstructor;
static {
try {
Field f = Buffer.class.getDeclaredField("address");
addressFieldOffset = UnsafeAccess.getUnsafe().objectFieldOffset(f);
Class directByteBufferClass = Class.forName("java.nio.DirectByteBuffer");
directByteBufferConstructor = directByteBufferClass.getDeclaredConstructor(new Class[] { Long.TYPE, Integer.TYPE });
directByteBufferConstructor.setAccessible(true);
} catch (Exception e) {
throw new RuntimeException(e);
}
}
public static long getDirectBufferAddress(Buffer buf) {
return ((buf == null) ? 0 : UnsafeAccess.getUnsafe().getLong(buf, addressFieldOffset));
}
public static ByteBuffer newDirectByteBuffer(long address, int capacity) {
try {
if (address == 0) {
return null;
}
return (ByteBuffer) directByteBufferConstructor.newInstance(new Object[] { new Long(address), new Integer(capacity) });
} catch (Exception e) {
throw new RuntimeException(e);
}
}
public static long newCString(String str) {
byte[] strBytes = str.getBytes();
long strBlock = UnsafeAccess.getUnsafe().allocateMemory(strBytes.length+1);
for (int i = 0; i < strBytes.length; i++) {
UnsafeAccess.getUnsafe().putByte(strBlock+i, strBytes[i]);
}
UnsafeAccess.getUnsafe().putByte(strBlock+strBytes.length, (byte)0); // null termination
return strBlock;
}
public static void freeCString(long cStr) {
UnsafeAccess.getUnsafe().freeMemory(cStr);
}
public static String newJavaString(long cStr) {
if (cStr == 0) {
return null;
}
int numChars = 0;
while (UnsafeAccess.getUnsafe().getByte(cStr + numChars) != 0) {
++numChars;
}
byte[] bytes = new byte[numChars];
for (int i = 0; i < numChars; i++) {
bytes[i] = UnsafeAccess.getUnsafe().getByte(cStr + i);
}
return new String(bytes);
}
public static int arrayBaseOffset(Object array) {
return UnsafeAccess.getUnsafe().arrayBaseOffset(array.getClass());
}
public static int arrayIndexScale(Object array) {
return UnsafeAccess.getUnsafe().arrayIndexScale(array.getClass());
}
}
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