Here you can find the source of unsignedToSigned(int unsigned, int size)
private static int unsignedToSigned(int unsigned, int size)
//package com.java2s; /***************************** BEGIN LICENSE BLOCK *************************** //from w ww .ja v a2 s . c om The contents of this file are subject to the Mozilla Public License, v. 2.0. If a copy of the MPL was not distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/. Software distributed under the License is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for the specific language governing rights and limitations under the License. Copyright (C) 2012-2016 Sensia Software LLC. All Rights Reserved. ******************************* END LICENSE BLOCK ***************************/ public class Main { private static int unsignedToSigned(int unsigned, int size) { if ((unsigned & (1 << size - 1)) != 0) unsigned = -1 * ((1 << size - 1) - (unsigned & ((1 << size - 1) - 1))); return unsigned; } }