docs: private byte[] getContent()
          throws IOException
      {
          InputStream is = null;
          try
          {
              MessageDigest digest = MessageDigest.getInstance( "MD5" );
              digest.reset();
              byte[] buffer = new byte[8192];
              int read;
              try
              {
                  is = entry.getInputStream();
                  while ( ( read = is.read( buffer ) ) > 0 )
                  {
                      digest.update( buffer, 0, read );
                  }
              }
              catch ( IOException e )
              {
                  if ( is != null )
                  {
                      throw e;
                  }
              }
              final String md5 = StringUtils.leftPad( new BigInteger( 1, digest.digest() ).toString( 16 ), 32, "0" );
              return md5.getBytes();
          }
          catch ( NoSuchAlgorithmException e )
          {
              IOException ioe = new IOException( "Unable to calculate hash" );
              ioe.initCause( e );
              throw ioe;
          }
          finally
          {
              IOUtils.closeQuietly( is );
          }
      }