Here you can find the source of unsignedToSigned(long value, int size)
public static long unsignedToSigned(long value, int size)
//package com.java2s; /*//from w w w. j a v a 2s . c o m * This file is part of rasdaman community. * * Rasdaman community is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * Rasdaman community 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 for more details. * * You should have received a copy of the GNU General Public License * along with rasdaman community. If not, see <http://www.gnu.org/licenses/>. * * Copyright 2003, 2004, 2005, 2006, 2007, 2008, 2009 Peter Baumann / rasdaman GmbH. * * For more information please see <http://www.rasdaman.org> * or contact Peter Baumann via <baumann@rasdaman.com>. */ public class Main { public static long unsignedToSigned(long value, int size) { long signbit = value & (1L << (size - 1)); return (signbit == 0) ? value : (value - (1L << size)); } }