PclZip::privDuplicate

  function privDuplicate($p_archive_filename)
  {
    $v_result=1;

    // ----- Look if the $p_archive_filename exists
    if (!is_file($p_archive_filename))
    {

      // ----- Nothing to duplicate, so duplicate is a success.
      $v_result = 1;

      // ----- Return
      return $v_result;
    }

    // ----- Open the zip file
    if (($v_result=$this->privOpenFd('wb')) != 1)
    {
      // ----- Return
      return $v_result;
    }

    // ----- Open the temporary file in write mode
    if (($v_zip_temp_fd = @fopen($p_archive_filename, 'rb')) == 0)
    {
      $this->privCloseFd();

      PclZip::privErrorLog(PCLZIP_ERR_READ_OPEN_FAIL, 'Unable to open archive file \''.$p_archive_filename.'\' in binary write mode');

      // ----- Return
      return PclZip::errorCode();
    }

    // ----- Copy the files from the archive to the temporary file
    // TBC : Here I should better append the file and go back to erase the central dir
    $v_size = filesize($p_archive_filename);
    while ($v_size != 0)
    {
      $v_read_size = ($v_size < PCLZIP_READ_BLOCK_SIZE ? $v_size : PCLZIP_READ_BLOCK_SIZE);
      $v_buffer = fread($v_zip_temp_fd, $v_read_size);
      @fwrite($this->zip_fd, $v_buffer, $v_read_size);
      $v_size -= $v_read_size;
    }

    // ----- Close
    $this->privCloseFd();

    // ----- Close the temporary file
    @fclose($v_zip_temp_fd);

    // ----- Return
    return $v_result;
  }