| /* |
| * Copyright (c) 1996, 1999, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code 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 |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package java.util.zip; |
| |
| import java.io.FilterOutputStream; |
| import java.io.OutputStream; |
| import java.io.IOException; |
| |
| /** |
| * An output stream that also maintains a checksum of the data being |
| * written. The checksum can then be used to verify the integrity of |
| * the output data. |
| * |
| * @see Checksum |
| * @author David Connelly |
| */ |
| public |
| class CheckedOutputStream extends FilterOutputStream { |
| private Checksum cksum; |
| |
| /** |
| * Creates an output stream with the specified Checksum. |
| * @param out the output stream |
| * @param cksum the checksum |
| */ |
| public CheckedOutputStream(OutputStream out, Checksum cksum) { |
| super(out); |
| this.cksum = cksum; |
| } |
| |
| /** |
| * Writes a byte. Will block until the byte is actually written. |
| * @param b the byte to be written |
| * @exception IOException if an I/O error has occurred |
| */ |
| public void write(int b) throws IOException { |
| out.write(b); |
| cksum.update(b); |
| } |
| |
| /** |
| * Writes an array of bytes. Will block until the bytes are |
| * actually written. |
| * @param b the data to be written |
| * @param off the start offset of the data |
| * @param len the number of bytes to be written |
| * @exception IOException if an I/O error has occurred |
| */ |
| public void write(byte[] b, int off, int len) throws IOException { |
| out.write(b, off, len); |
| cksum.update(b, off, len); |
| } |
| |
| /** |
| * Returns the Checksum for this output stream. |
| * @return the Checksum |
| */ |
| public Checksum getChecksum() { |
| return cksum; |
| } |
| } |