Here you can find the source of longFromBytes(byte[] buffer, int offset)
public static long longFromBytes(byte[] buffer, int offset)
//package com.java2s; /*/*from w w w . j a v a 2s .c o m*/ * JSocket Wrench * * Copyright (C) act365.com October 2003 * * Web site: http://www.act365.com/wrench * E-mail: developers@act365.com * * The JSocket Wrench library adds support for low-level Internet protocols * to the Java programming language. * * This program 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 2 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; 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 * this program; if not, write to the Free Software Foundation, Inc., * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ public class Main { /** Converts consecutive bytes from a buffer into a long. */ public static long longFromBytes(byte[] buffer, int offset) { return integralFromBytes(buffer, offset, 8); } /** Forms an integral type from consecutive bytes in a buffer */ static long integralFromBytes(byte[] buffer, int offset, int length) { long answer = 0; while (--length >= 0) { answer = answer << 8; answer |= buffer[offset] >= 0 ? buffer[offset] : 0xffffff00 ^ buffer[offset]; ++offset; } return answer; } }