85 lines
2.8 KiB
Java
85 lines
2.8 KiB
Java
|
/*
|
||
|
|
* Copyright (c) 1996, 2019, 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
|
||
|
|
* @since 1.1
|
||
|
|
*/
|
||
|
|
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
|
||
|
|
* @throws 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
|
||
|
|
* @throws 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;
|
||
|
|
}
|
||
|
|
}
|