/*
* @(#)CheckedOutputStream.java 1.19 05/11/17
*
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
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
* @version 1.19, 11/17/05
* @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;
}
}