<?php
/**
 * @package php-font-lib
 * @link    https://github.com/dompdf/php-font-lib
 * @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License
 */
namespace FontLib\Table;

use FontLib\TrueType\File;
use FontLib\Font;
use FontLib\BinaryStream;

/**
 * Generic font table.
 *
 * @package php-font-lib
 */
class Table extends BinaryStream {
  /**
   * @var DirectoryEntry
   */
  protected $entry;
  protected $def = array();

  public $data;

  final public function __construct(DirectoryEntry $entry) {
    $this->entry = $entry;
    $entry->setTable($this);
  }

  /**
   * @return File
   */
  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);
  }

  public function toHTML() {
    return "<pre>" . var_export($this->data, true) . "</pre>";
  }

  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();
  }
}