| /* CheckedOutputStream.java - Compute checksum of data being written. |
| Copyright (C) 1999, 2000 Free Software Foundation, Inc. |
| |
| This file is part of GNU Classpath. |
| |
| GNU Classpath 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, or (at your option) |
| any later version. |
| |
| GNU Classpath 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 GNU Classpath; see the file COPYING. If not, write to the |
| Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. |
| |
| As a special exception, if you link this library with other files to |
| produce an executable, this library does not by itself cause the |
| resulting executable to be covered by the GNU General Public License. |
| This exception does not however invalidate any other reasons why the |
| executable file might be covered by the GNU General Public License. */ |
| |
| package java.util.zip; |
| |
| import java.io.FilterOutputStream; |
| import java.io.OutputStream; |
| import java.io.IOException; |
| |
| /* Written using on-line Java Platform 1.2 API Specification |
| * and JCL book. |
| * Believed complete and correct. |
| */ |
| |
| /** |
| * OutputStream that computes a checksum of data being written using a |
| * supplied Checksum object. |
| * |
| * @see Checksum |
| * |
| * @author Tom Tromey |
| * @date May 17, 1999 |
| */ |
| public class CheckedOutputStream extends FilterOutputStream |
| { |
| /** |
| * Creates a new CheckInputStream on top of the supplied OutputStream |
| * using the supplied Checksum. |
| */ |
| public CheckedOutputStream (OutputStream out, Checksum cksum) |
| { |
| super (out); |
| this.sum = cksum; |
| } |
| |
| /** |
| * Returns the Checksum object used. To get the data checksum computed so |
| * far call <code>getChecksum.getValue()</code>. |
| */ |
| public Checksum getChecksum () |
| { |
| return sum; |
| } |
| |
| /** |
| * Writes one byte to the OutputStream and updates the Checksum. |
| */ |
| public void write (int bval) throws IOException |
| { |
| out.write(bval); |
| sum.update(bval); |
| } |
| |
| /** |
| * Writes the byte array to the OutputStream and updates the Checksum. |
| */ |
| public void write (byte[] buf, int off, int len) throws IOException |
| { |
| out.write(buf, off, len); |
| sum.update(buf, off, len); |
| } |
| |
| /** The checksum object. */ |
| private Checksum sum; |
| } |