<?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_woff.cls.php 39 2012-01-15 12:25:22Z fabien.menager $
   */
  
  require_once dirname(__FILE__)."/font_truetype.cls.php";
  require_once dirname(__FILE__)."/font_woff_table_directory_entry.cls.php";
  require_once dirname(__FILE__)."/font_woff_header.cls.php";
  
  /**
   * WOFF font file.
   * 
   * @package php-font-lib
   */
  class Font_WOFF extends Font_TrueType {
    function parseHeader(){
      if (!empty($this->header)) {
        return;
      }
      
      $this->header = new Font_WOFF_Header($this);
      $this->header->parse();
    }
    
    public function load($file) {
      parent::load($file);
      
      $this->parseTableEntries();
      $dataOffset = $this->pos() + count($this->directory) * 20;
      
      $fw = $this->getTempFile(false);
      $fr = $this->f;
      
      $this->f = $fw;
      $offset = $this->header->encode();
      
      foreach($this->directory as $entry) {
        // Read ...
        $this->f = $fr;
        $this->seek($entry->offset);
        $data = $this->read($entry->length);
        
        if ($entry->length < $entry->origLength) {
          $data = gzuncompress($data);
        }
        
        // Prepare data ...
        $length = strlen($data);
        $entry->length = $entry->origLength = $length;
        $entry->offset = $dataOffset;
        
        // Write ...
        $this->f = $fw;
        
        // Woff Entry 
        $this->seek($offset);
        $offset += $this->write($entry->tag, 4);    // tag
        $offset += $this->writeUInt32($dataOffset); // offset
        $offset += $this->writeUInt32($length);     // length
        $offset += $this->writeUInt32($length);     // origLength
        $offset += $this->writeUInt32(Font_Table_Directory_Entry::computeChecksum($data)); // checksum
        
        // Data
        $this->seek($dataOffset);
        $dataOffset += $this->write($data, $length);
      }
      
      $this->f = $fw;
      $this->seek(0);
      
      // Need to re-parse this, don't know why
      $this->header = null;
      $this->directory = array();
      $this->parseTableEntries();
    }
  }