<?php
  /**
   * @package php-font-lib
   * @link    http://php-font-lib.googlecode.com/
   * @author  Fabien Ménager <fabien.menager@gmail.com>
   * @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License
   * @version $Id: font_table.cls.php 37 2011-11-07 07:38:44Z fabien.menager $
   */
  
  /**
   * Generic font table.
   * 
   * @package php-font-lib
   */
  class Font_Table extends Font_Binary_Stream {
    /**
     * @var Font_Table_Directory_Entry
     */
    protected $entry;
    protected $def = array();
    
    public $data;
    
    final public function __construct(Font_Table_Directory_Entry $entry) {
      $this->entry = $entry;
      $entry->setTable($this);
    }
    
    /**
     * @return Font_TrueType
     */
    public function getFont(){
      return $this->entry->getFont();
    }
    
    protected function _encode(){
      if (empty($this->data)) {
        Font::d("  >> Table is empty");
        return 0;
      }
      
      return $this->getFont()->pack($this->def, $this->data);
    }
    
    protected function _parse(){
      $this->data = $this->getFont()->unpack($this->def);
    }
    
    protected function _parseRaw(){
      $this->data = $this->getFont()->read($this->entry->length);
    }
    
    protected function _encodeRaw(){
      return $this->getFont()->write($this->data, $this->entry->length);
    }
    
    final public function encode(){
      $this->entry->startWrite();
      
      if (false && empty($this->def)) {
        $length = $this->_encodeRaw();
      }
      else {
        $length = $this->_encode();
      }
      
      $this->entry->endWrite();
      
      return $length;
    }
    
    final public function parse(){
      $this->entry->startRead();
      
      if (false && empty($this->def)) {
        $this->_parseRaw();
      }
      else {
        $this->_parse();
      }
      
      $this->entry->endRead();
    }
  }