code: function _FindCDEnd($cd_info) {
  		$nbr = 1;
  		$p = false;
  		$pos = ftell($this->ArchHnd) - 4 - 256;
  		while ( ($p===false) && ($nbr<256) ) {
  			if ($pos<=0) {
  				$pos = 0;
  				$nbr = 256; // in order to make this a last check
  			}
  			$this->_MoveTo($pos);
  			$x = $this->_ReadData(256);
  			$p = strpos($x, $cd_info);
  			if ($p===false) {
  				$nbr++;
  				$pos = $pos - 256 - 256;
  			} else {
  				return $pos + $p;
  			}
  		}
  		return false;
  	}
docs: Search the record of end of the Central Directory.
  Return the position of the record in the file.
  Return false if the record is not found. The comment cannot exceed 65335 bytes (=FFFF).
  The method is read backwards a block of 256 bytes and search the key in this block.