/*
 * Copyright (c) 1995-1997 Sun Microsystems, Inc. All Rights Reserved.
 *
 * Permission to use, copy, modify, and distribute this software
 * and its documentation for NON-COMMERCIAL purposes and without
 * fee is hereby granted provided that this copyright notice
 * appears in all copies. Please refer to the file "copyright.html"
 * for further important copyright and licensing information.
 *
 * SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF
 * THE SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
 * TO THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
 * PARTICULAR PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR
 * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
 * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES.
 */
import java.io.FilterInputStream;
import java.io.InputStream;
import java.io.IOException;

public
class CheckedInputStream extends FilterInputStream {
    private Checksum cksum;

    public CheckedInputStream(InputStream in, Checksum cksum) {
        super(in);
        this.cksum = cksum;
    }

    public int read() throws IOException {
        int b = in.read();
        if (b != -1) {
            cksum.update(b);
        }
        return b;
    }

    public int read(byte[] b) throws IOException {
        int len;
        len = in.read(b, 0, b.length);
        if (len != -1) {
            cksum.update(b, 0, b.length);
        }
        return len;
    }

    public int read(byte[] b, int off, int len) throws IOException {
        len = in.read(b, off, len);
        if (len != -1) {
            cksum.update(b, off, len);
        }
        return len;
    }

    public Checksum getChecksum() {
        return cksum;
    }
}