Here you can find the source of readall(InputStream in)
static byte[] readall(InputStream in) throws IOException
//package com.java2s; /*// w w w . ja v a 2s. c o m * This file is part of the Haven & Hearth game client. * Copyright (C) 2009 Fredrik Tolf <fredrik@dolda2000.com>, and * Bj?rn Johannessen <johannessen.bjorn@gmail.com> * * Redistribution and/or modification of this file is subject to the * terms of the GNU Lesser General Public License, version 3, as * published by the Free Software Foundation. * * 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. * * Other parts of this source tree adhere to other copying * rights. Please see the file `COPYING' in the root directory of the * source tree for details. * * A copy the GNU Lesser General Public License is distributed along * with the source tree of which this file is a part in the file * `doc/LPGL-3'. If it is missing for any reason, please see the Free * Software Foundation's website at <http://www.fsf.org/>, or write * to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, * Boston, MA 02111-1307 USA */ import java.io.*; public class Main { static byte[] readall(InputStream in) throws IOException { byte[] buf = new byte[4096]; int off = 0; while (true) { if (off == buf.length) { byte[] n = new byte[buf.length * 2]; System.arraycopy(buf, 0, n, 0, buf.length); buf = n; } int ret = in.read(buf, off, buf.length - off); if (ret < 0) { byte[] n = new byte[off]; System.arraycopy(buf, 0, n, 0, off); return (n); } off += ret; } } }