151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski/* 251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Copyright (c) 1996, 1999, Oracle and/or its affiliates. All rights reserved. 351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This code is free software; you can redistribute it and/or modify it 651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * under the terms of the GNU General Public License version 2 only, as 751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * published by the Free Software Foundation. Oracle designates this 851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * particular file as subject to the "Classpath" exception as provided 951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * by Oracle in the LICENSE file that accompanied this code. 1051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 1151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This code is distributed in the hope that it will be useful, but WITHOUT 1251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 1351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 1451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * version 2 for more details (a copy is included in the LICENSE file that 1551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * accompanied this code). 1651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 1751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * You should have received a copy of the GNU General Public License version 1851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 2 along with this work; if not, write to the Free Software Foundation, 1951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 2051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 2151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 2251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * or visit www.oracle.com if you need additional information or have any 2351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * questions. 2451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 2551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 2651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebskipackage java.util.zip; 2751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 2851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebskiimport java.io.FilterOutputStream; 2951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebskiimport java.io.OutputStream; 3051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebskiimport java.io.IOException; 3151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 3251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski/** 3351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * An output stream that also maintains a checksum of the data being 3451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * written. The checksum can then be used to verify the integrity of 3551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * the output data. 3651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 3751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see Checksum 3851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @author David Connelly 3951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 4051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebskipublic 4151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebskiclass CheckedOutputStream extends FilterOutputStream { 4251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private Checksum cksum; 4351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 4451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 4551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Creates an output stream with the specified Checksum. 4651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param out the output stream 4751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param cksum the checksum 4851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 4951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public CheckedOutputStream(OutputStream out, Checksum cksum) { 5051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski super(out); 5151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski this.cksum = cksum; 5251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 5351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 5451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 5551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Writes a byte. Will block until the byte is actually written. 5651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param b the byte to be written 5751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error has occurred 5851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 5951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public void write(int b) throws IOException { 6051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski out.write(b); 6151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski cksum.update(b); 6251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 6351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 6451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 6551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Writes an array of bytes. Will block until the bytes are 6651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * actually written. 6751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param b the data to be written 6851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param off the start offset of the data 6951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param len the number of bytes to be written 7051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error has occurred 7151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 7251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public void write(byte[] b, int off, int len) throws IOException { 7351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski out.write(b, off, len); 7451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski cksum.update(b, off, len); 7551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 7651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 7751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 7851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Returns the Checksum for this output stream. 7951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the Checksum 8051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 8151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public Checksum getChecksum() { 8251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return cksum; 8351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 8451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski} 85