<?php
  /**
   * @package php-font-lib
   * @link    https://github.com/dompdf/php-font-lib
   * @author  Fabien Ménager <fabien.menager@gmail.com>
   * @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License
   */
  
  namespace FontLib\WOFF;
  
  use FontLib\Table\DirectoryEntry;
  
  /**
   * WOFF font file.
   *
   * @package php-font-lib
   *
   * @property TableDirectoryEntry[] $directory
   */
  class File extends \FontLib\TrueType\File {
    function parseHeader() {
      if (!empty($this->header)) {
        return;
      }
  
      $this->header = new Header($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) {
          $data = (string) gzuncompress($data);
        }
  
        // Prepare data ...
        $length        = mb_strlen($data, '8bit');
        $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 += $this->writeUInt32(DirectoryEntry::computeChecksum($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();
    }
  }