content: /*
   * 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;
      }
  }
  