Here you can find the source of readLong(InputStream in)
public static long readLong(InputStream in) throws IOException
//package com.java2s; /*//from w ww. j a va 2 s . com This file is part of ADBCJ. ADBCJ 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. ADBCJ 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 ADBCJ. If not, see <http://www.gnu.org/licenses/>. Copyright 2008 Mike Heath */ import java.io.*; public class Main { public static long readLong(InputStream in) throws IOException { long b0 = safeRead(in); long b1 = safeRead(in); long b2 = safeRead(in); long b3 = safeRead(in); long b4 = safeRead(in); long b5 = safeRead(in); long b6 = safeRead(in); long b7 = safeRead(in); return b7 << 56 | b6 << 48 | b5 << 40 | b4 << 32 | b3 << 24 | b2 << 16 | b1 << 8 | b0; } /** * @return an unsigned byte * @throws IOException if there is an error reading from the stream * @throws EOFException if the end of the stream is reached */ public static int safeRead(InputStream in) throws IOException { int i = in.read(); if (i < 0) { throw new EOFException(); } return i; } }