| gvSIG desktop 1

package es.prodevelop.gvsig.mobile.fmap.util.md5;

import java.io.FilterInputStream;

import java.io.IOException;

import java.io.InputStream;

import org.apache.log4j.Logger;

/** 

 * MD5InputStream, a subclass of FilterInputStream implementing MD5

 * functionality on a stream.

 * <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)

 **/

/************************************************

 *                                                                                                *

 *   Modfied By:                                                                *

 *   Prodevelop Integraci?n de Tecnolog?as SL        *

 *   Conde Salvatierra de ?lava , 34-10                        *

 *   46004 Valencia                                                                *

 *   Spain                                                                                *

 *                                                                                                *

 *   +34 963 510 612                                                        *

 *   +34 963 510 968                                                        *

 *   gis@prodevelop.es                                                        *

 *   http://www.prodevelop.es                                        *

 *                                                                                                *

 *   gvSIG Mobile Team 2006                                         *

 *                                                                                          *         

 ************************************************/

public class MD5InputStream extends FilterInputStream {

        private static Logger logger = Logger.getLogger(MD5InputStream.class.getName());        

  /**

   * MD5 context

   */

  private MD5        md5;

  /**

   * Creates a MD5InputStream

   * @param in        The input stream

   */

  public MD5InputStream (InputStream in) {

    super(in);

    md5 = new MD5();

  }

  /**

   * Read a byte of data. 

   * @see java.io.FilterInputStream

   */

  public int read() throws IOException {

    int c = in.read();

    if (c == -1)

        return -1;

    if ((c & ~0xff) != 0) {

            logger.debug("MD5InputStream.read() got character with (c & ~0xff) != 0)!");

    } else {

      md5.Update(c);

    }

    return c;

  }

  /**

   * Reads into an array of bytes.

   *

   * @see java.io.FilterInputStream

   */

  public int read (byte bytes[], int offset, int length) throws IOException {

    int        r;

    if ((r = in.read(bytes, offset, length)) == -1)

      return r;

    md5.Update(bytes, offset, r);

    return r;

  }

  /**

   * 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;

  }

}