Here you can find the source of byteArrayToNumber(byte[] data, int index, int length, ByteOrder byteOrder)
public static int byteArrayToNumber(byte[] data, int index, int length, ByteOrder byteOrder) throws ArrayIndexOutOfBoundsException
//package com.java2s; /*//from www . j a va 2s .c o m Copyright 2009-2015 Stefano Chizzolini. http://www.pdfclown.org Contributors: * Stefano Chizzolini (original code developer, http://www.stefanochizzolini.it) This file should be part of the source code distribution of "PDF Clown library" (the Program): see the accompanying README files for more info. This Program is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This Program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY, either expressed or implied; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the License for more details. You should have received a copy of the GNU Lesser General Public License along with this Program (see README files); if not, go to the GNU website (http://www.gnu.org/licenses/). Redistribution and use, with or without modification, are permitted provided that such redistributions retain the above copyright notice, license and disclaimer, along with this list of conditions. */ import java.nio.ByteOrder; public class Main { public static int byteArrayToNumber(byte[] data, int index, int length, ByteOrder byteOrder) throws ArrayIndexOutOfBoundsException { int value; { length = Math.min(length, data.length - index); value = 0; for (int i = index, endIndex = index + length; i < endIndex; i++) { value |= (data[i] & 0xff) << 8 * (byteOrder == ByteOrder.LITTLE_ENDIAN ? i - index : endIndex - i - 1); } } return value; } }