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/*
* Copyright (c) 2003 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.
*/
package com.sun.gluegen.runtime;
import java.nio.*;
public class PointerBuffer {
private ByteBuffer bb;
private IntBuffer ib;
public PointerBuffer(ByteBuffer bb) {
this.bb = bb;
this.ib = bb.asIntBuffer();
}
public ByteBuffer getBuffer() {
return bb;
}
/** Retrieves the long at the specified slot (8-byte offset). */
public long get(int slot) {
slot = slot << 1 ; // 8-byte to 4-byte offset
long lo = 0x00000000FFFFFFFFL & ( (long) ib.get(slot) );
long hi = 0x00000000FFFFFFFFL & ( (long) ib.get(slot+1) );
if(BufferFactory.isLittleEndian()) {
return hi << 32 | lo ;
}
return lo << 32 | hi ;
}
/** Puts a long at the specified slot (8-byte offset). */
public void put(int slot, long v) {
slot = slot << 1 ; // 8-byte to 4-byte offset
int lo = (int) ( ( v ) & 0x00000000FFFFFFFFL ) ;
int hi = (int) ( ( v >> 32 ) & 0x00000000FFFFFFFFL ) ;
if(BufferFactory.isLittleEndian()) {
ib.put(slot, lo);
ib.put(slot+1, hi);
} else {
ib.put(slot, hi);
ib.put(slot+1, lo);
}
}
}
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