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<?php
/**
* Zend Framework
*
* LICENSE
*
* This source file is subject to the new BSD license that is bundled
* with this package in the file LICENSE.txt.
* It is also available through the world-wide-web at this URL:
* http://framework.zend.com/license/new-bsd
* If you did not receive a copy of the license and are unable to
* obtain it through the world-wide-web, please send an email
* to license@zend.com so we can send you a copy immediately.
*
* @category Zend
* @package Zend_Pdf
* @copyright Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
* @version $Id: Table.php 20096 2010-01-06 02:05:09Z bkarwin $
*/
/**
* PDF file reference table
*
* @category Zend
* @package Zend_Pdf
* @copyright Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
class Zend_Pdf_Element_Reference_Table
{
/**
* Parent reference table
*
* @var Zend_Pdf_Element_Reference_Table
*/
private $_parent;
/**
* Free entries
* 'reference' => next free object number
*
* @var array
*/
private $_free;
/**
* Generation numbers for free objects.
* Array: objNum => nextGeneration
*
* @var array
*/
private $_generations;
/**
* In use entries
* 'reference' => offset
*
* @var array
*/
private $_inuse;
/**
* Generation numbers for free objects.
* Array: objNum => objGeneration
*
* @var array
*/
private $_usedObjects;
/**
* Object constructor
*/
public function __construct()
{
$this->_parent = null;
$this->_free = array(); $this->_generations = array();
$this->_inuse = array(); $this->_usedObjects = array();
}
/**
* Add reference to the reference table
*
* @param string $ref
* @param integer $offset
* @param boolean $inuse
*/
public function addReference($ref, $offset, $inuse = true)
{
$refElements = explode(' ', $ref);
if (!is_numeric($refElements[0]) || !is_numeric($refElements[1]) || $refElements[2] != 'R') {
require_once 'Zend/Pdf/Exception.php';
throw new Zend_Pdf_Exception("Incorrect reference: '$ref'");
}
$objNum = (int)$refElements[0];
$genNum = (int)$refElements[1];
if ($inuse) {
$this->_inuse[$ref] = $offset;
$this->_usedObjects[$objNum] = $objNum;
} else {
$this->_free[$ref] = $offset;
$this->_generations[$objNum] = $genNum;
}
}
/**
* Set parent reference table
*
* @param Zend_Pdf_Element_Reference_Table $parent
*/
public function setParent(self $parent)
{
$this->_parent = $parent;
}
/**
* Get object offset
*
* @param string $ref
* @return integer
*/
public function getOffset($ref)
{
if (isset($this->_inuse[$ref])) {
return $this->_inuse[$ref];
}
if (isset($this->_free[$ref])) {
return null;
}
if (isset($this->_parent)) {
return $this->_parent->getOffset($ref);
}
return null;
}
/**
* Get next object from a list of free objects.
*
* @param string $ref
* @return integer
* @throws Zend_Pdf_Exception
*/
public function getNextFree($ref)
{
if (isset($this->_inuse[$ref])) {
require_once 'Zend/Pdf/Exception.php';
throw new Zend_Pdf_Exception('Object is not free');
}
if (isset($this->_free[$ref])) {
return $this->_free[$ref];
}
if (isset($this->_parent)) {
return $this->_parent->getNextFree($ref);
}
require_once 'Zend/Pdf/Exception.php';
throw new Zend_Pdf_Exception('Object not found.');
}
/**
* Get next generation number for free object
*
* @param integer $objNum
* @return unknown
*/
public function getNewGeneration($objNum)
{
if (isset($this->_usedObjects[$objNum])) {
require_once 'Zend/Pdf/Exception.php';
throw new Zend_Pdf_Exception('Object is not free');
}
if (isset($this->_generations[$objNum])) {
return $this->_generations[$objNum];
}
if (isset($this->_parent)) {
return $this->_parent->getNewGeneration($objNum);
}
require_once 'Zend/Pdf/Exception.php';
throw new Zend_Pdf_Exception('Object not found.');
}
}
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