/*
* 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.
*
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*/
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;
}
}