com.mchange.lang.LongUtils Maven / Gradle / Ivy
/*
* Distributed as part of mchange-commons-java 0.2.6.3
*
* Copyright (C) 2013 Machinery For Change, Inc.
*
* Author: Steve Waldman
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of EITHER:
*
* 1) The GNU Lesser General Public License (LGPL), version 2.1, as
* published by the Free Software Foundation
*
* OR
*
* 2) The Eclipse Public License (EPL), version 1.0
*
* You may choose which license to accept if you wish to redistribute
* or modify this work. You may offer derivatives of this work
* under the license you have chosen, or you may provide the same
* choice of license which you have been offered here.
*
* This software 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.
*
* You should have received copies of both LGPL v2.1 and EPL v1.0
* along with this software; see the files LICENSE-EPL and LICENSE-LGPL.
* If not, the text of these licenses are currently available at
*
* LGPL v2.1: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* EPL v1.0: http://www.eclipse.org/org/documents/epl-v10.php
*
*/
package com.mchange.lang;
public class LongUtils
{
private LongUtils()
{}
public static long longFromByteArray(byte[] bytes, int offset)
{
long out = 0;
out |= ((long) ByteUtils.toUnsigned(bytes[offset + 0])) << 56;
out |= ((long) ByteUtils.toUnsigned(bytes[offset + 1])) << 48;
out |= ((long) ByteUtils.toUnsigned(bytes[offset + 2])) << 40;
out |= ((long) ByteUtils.toUnsigned(bytes[offset + 3])) << 32;
out |= ((long) ByteUtils.toUnsigned(bytes[offset + 4])) << 24;
out |= ((long) ByteUtils.toUnsigned(bytes[offset + 5])) << 16;
out |= ((long) ByteUtils.toUnsigned(bytes[offset + 6])) << 8;
out |= ((long) ByteUtils.toUnsigned(bytes[offset + 7])) << 0;
return out;
}
public static byte[] byteArrayFromLong(long l)
{
byte[] out = new byte[8];
longIntoByteArray(l, 0, out);
return out;
}
public static void longIntoByteArray(long l, int offset, byte[] bytes)
{
bytes[offset + 0] = (byte) ((l >>> 56) & 0xFF);
bytes[offset + 1] = (byte) ((l >>> 48) & 0xFF);
bytes[offset + 2] = (byte) ((l >>> 40) & 0xFF);
bytes[offset + 3] = (byte) ((l >>> 32) & 0xFF);
bytes[offset + 4] = (byte) ((l >>> 24) & 0xFF);
bytes[offset + 5] = (byte) ((l >>> 16) & 0xFF);
bytes[offset + 6] = (byte) ((l >>> 8) & 0xFF);
bytes[offset + 7] = (byte) ((l >>> 0) & 0xFF);
}
public static int fullHashLong( long l )
{ return hashLong( l ); }
public static int hashLong( long l )
{ return (int) l ^ (int) ( l >>> 32 ); }
}