content: package com.twmacinta.util;
  
  import java.io.BufferedInputStream;
  import java.io.FileInputStream;
  import java.io.FilterOutputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.OutputStream;
  
  /**
   * MD5OutputStream is a subclass of FilterOutputStream adding MD5
   * hashing of the output.
   * <p/>
   * Originally written by Santeri Paavolainen, Helsinki Finland 1996 <br>
   * (c) Santeri Paavolainen, Helsinki Finland 1996 <br>
   * Some changes Copyright (c) 2002 Timothy W Macinta <br>
   * <p/>
   * This library is free software; you can redistribute it and/or
   * modify it under the terms of the GNU Library General Public
   * License as published by the Free Software Foundation; either
   * version 2.1 of the License, or (at your option) any later version.
   * <p/>
   * This library 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
   * Library General Public License for more details.
   * <p/>
   * You should have received a copy of the GNU Library General Public
   * License along with this library; if not, write to the Free
   * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
   * <p/>
   * See http://www.twmacinta.com/myjava/fast_md5.php for more information
   * on this file.
   * <p/>
   * Please note: I (Timothy Macinta) have put this code in the
   * com.twmacinta.util package only because it came without a package.  I
   * was not the the original author of the code, although I did
   * optimize it (substantially) and fix some bugs.
   *
   * @author Santeri Paavolainen <santtu@cs.hut.fi>
   * @author Timothy W Macinta (twm@alum.mit.edu) (added main() method)
   **/
  
  public class MD5OutputStream extends FilterOutputStream {
      /**
       * MD5 context
       */
      private MD5 md5;
  
      /**
       * Creates MD5OutputStream
       *
       * @param out The output stream
       */
  
      public MD5OutputStream(OutputStream out) {
          super(out);
  
          md5 = new MD5();
      }
  
      /**
       * This method is here for testing purposes only - do not rely
       * on it being here.
       **/
      public static void main(String[] arg) {
          try {
              MD5OutputStream out = new MD5OutputStream(new com.twmacinta.io.NullOutputStream());
              InputStream in = new BufferedInputStream(new FileInputStream(arg[0]));
              byte[] buf = new byte[65536];
              int num_read;
              long total_read = 0;
              while ((num_read = in.read(buf)) != -1) {
                  total_read += num_read;
                  out.write(buf, 0, num_read);
              }
              System.out.println(MD5.asHex(out.hash()) + "  " + arg[0]);
              in.close();
              out.close();
          } catch (Exception e) {
              e.printStackTrace();
          }
      }
  
      /**
       * Writes a byte.
       *
       * @see java.io.FilterOutputStream
       */
  
      @Override
      public void write(int b) throws IOException {
          out.write(b);
          md5.Update((byte) b);
      }
  
      /**
       * Writes a sub array of bytes.
       *
       * @see java.io.FilterOutputStream
       */
  
      @Override
      public void write(byte b[], int off, int len) throws IOException {
          out.write(b, off, len);
          md5.Update(b, off, len);
      }
  
      /**
       * Returns array of bytes representing hash of the stream as finalized
       * for the current state.
       *
       * @see MD5#Final
       */
  
      public byte[] hash() {
          return md5.Final();
      }
  
      public MD5 getMD5() {
          return md5;
      }
  
  
  }
  
  