pdf.php

Bug tracker, and reporter.

<?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 [e-mail] so we can send you a copy immediately.
 *
 * @category   Zend
 * @package    Zend_Pdf
 * @copyright  Copyright (c) 2005-2008 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */


/** Zend_Pdf_Exception */
require_once 'Zend/Pdf/Exception.php';

/** Zend_Pdf_Page */
require_once 'Zend/Pdf/Page.php';

/** Zend_Pdf_Cmap */
require_once 'Zend/Pdf/Cmap.php';

/** Zend_Pdf_Font */
require_once 'Zend/Pdf/Font.php';

/** Zend_Pdf_Style */
require_once 'Zend/Pdf/Style.php';

/** Zend_Pdf_Parser */
require_once 'Zend/Pdf/Parser.php';

/** Zend_Pdf_Trailer */
require_once 'Zend/Pdf/Trailer.php';

/** Zend_Pdf_Trailer_Generator */
require_once 'Zend/Pdf/Trailer/Generator.php';

/** Zend_Pdf_Color */
require_once 'Zend/Pdf/Color.php';

/** Zend_Pdf_Color_GrayScale */
require_once 'Zend/Pdf/Color/GrayScale.php';

/** Zend_Pdf_Color_Rgb */
require_once 'Zend/Pdf/Color/Rgb.php';

/** Zend_Pdf_Color_Cmyk */
require_once 'Zend/Pdf/Color/Cmyk.php';

/** Zend_Pdf_Color_Html */
require_once 'Zend/Pdf/Color/Html.php';

/** Zend_Pdf_Image */
require_once 'Zend/Pdf/Resource/Image.php';

/** Zend_Pdf_Image */
require_once 'Zend/Pdf/Image.php';

/** Zend_Pdf_Image_Jpeg */
require_once 'Zend/Pdf/Resource/Image/Jpeg.php';

/** Zend_Pdf_Image_Tiff */
require_once 'Zend/Pdf/Resource/Image/Tiff.php';

/** Zend_Pdf_Image_Png */
require_once 'Zend/Pdf/Resource/Image/Png.php';


/** Zend_Memory */
require_once 'Zend/Memory.php';


/**
 * General entity which describes PDF document.
 * It implements document abstraction with a document level operations.
 *
 * Class is used to create new PDF document or load existing document.
 * See details in a class constructor description
 *
 * Class agregates document level properties and entities (pages, bookmarks,
 * document level actions, attachments, form object, etc)
 *
 * @category   Zend
 * @package    Zend_Pdf
 * @copyright  Copyright (c) 2005-2008 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */
class Zend_Pdf
{
  /**** Class Constants ****/

    /**
     * Version number of generated PDF documents.
     */
    const PDF_VERSION = 1.4;

    /**
     * PDF file header.
     */
    const PDF_HEADER  = "%PDF-1.4\n%\xE2\xE3\xCF\xD3\n";



    /**
     * Pages collection
     *
     * @todo implement it as a class, which supports ArrayAccess and Iterator interfaces,
     *       to provide incremental parsing and pages tree updating.
     *       That will give good performance and memory (PDF size) benefits.
     *
     * @var array   - array of Zend_Pdf_Page object
     */
    public $pages = array();

    /**
     * Document properties
     *
     * It's an associative array with PDF meta information, values may
     * be string, boolean or float.
     * Returned array could be used directly to access, add, modify or remove
     * document properties.
     *
     * Standard document properties: Title (must be set for PDF/X documents), Author,
     * Subject, Keywords (comma separated list), Creator (the name of the application,
     * that created document, if it was converted from other format), Trapped (must be
     * true, false or null, can not be null for PDF/X documents)
     *
     * @var array
     */
    public $properties = array();

    /**
     * Original properties set.
     *
     * Used for tracking properties changes
     *
     * @var array
     */
    private $_originalProperties = array();

    /**
     * Document level javascript
     *
     * @var string
     */
    private $_javaScript = null;

    /**
     * Document named actions
     * "GoTo..." actions, used to refer document parts
     * from outside PDF
     *
     * @var array   - array of Zend_Pdf_Action objects
     */
    private $_namedActions = array();


    /**
     * Pdf trailer (last or just created)
     *
     * @var Zend_Pdf_Trailer
     */
    private $_trailer = null;


    /**
     * PDF objects factory.
     *
     * @var Zend_Pdf_ElementFactory_Interface
     */
    private $_objFactory = null;

    /**
     * Memory manager for stream objects
     *
     * @var Zend_Memory_Manager|null
     */
    private static $_memoryManager = null;

    /**
     * Pdf file parser.
     * It's not used, but has to be destroyed only with Zend_Pdf object
     *
     * @var Zend_Pdf_Parser
     */
    private $_parser;

    /**
     * Request used memory manager
     *
     * @return Zend_Memory_Manager
     */
    static public function getMemoryManager()
    {
        if (self::$_memoryManager === null) {
            self::$_memoryManager = Zend_Memory::factory('none');
        }

        return self::$_memoryManager;
    }

    /**
     * Set user defined memory manager
     *
     * @param Zend_Memory_Manager $memoryManager
     */
    static public function setMemoryManager(Zend_Memory_Manager $memoryManager)
    {
        self::$_memoryManager = $memoryManager;
    }


    /**
     * Create new PDF document from a $source string
     *
     * @param string $source
     * @param integer $revision
     * @return Zend_Pdf
     */
    public static function parse(&$source = null, $revision = null)
    {
        return new Zend_Pdf($source, $revision);
    }

    /**
     * Load PDF document from a file
     *
     * @param string $source
     * @param integer $revision
     * @return Zend_Pdf
     */
    public static function load($source = null, $revision = null)
    {
        return new Zend_Pdf($source, $revision, true);
    }

    /**
     * Render PDF document and save it.
     *
     * If $updateOnly is true, then it only appends new section to the end of file.
     *
     * @param string $filename
     * @param boolean $updateOnly
     * @throws Zend_Pdf_Exception
     */
    public function save($filename, $updateOnly = false)
    {
        if (($file = @fopen($filename, $updateOnly ? 'ab':'wb')) === false ) {
            throw new Zend_Pdf_Exception( "Can not open '$filename' file for writing." );
        }

        $this->render($updateOnly, $file);

        fclose($file);
    }

    /**
     * Creates or loads PDF document.
     *
     * If $source is null, then it creates a new document.
     *
     * If $source is a string and $load is false, then it loads document
     * from a binary string.
     *
     * If $source is a string and $load is true, then it loads document
     * from a file.

     * $revision used to roll back document to specified version
     * (0 - currtent version, 1 - previous version, 2 - ...)
     *
     * @param string  $source - PDF file to load
     * @param integer $revision
     * @throws Zend_Pdf_Exception
     * @return Zend_Pdf
     */
    public function __construct($source = null, $revision = null, $load = false)
    {
        $this->_objFactory = Zend_Pdf_ElementFactory::createFactory(1);

        if ($source !== null) {
            $this->_parser  = new Zend_Pdf_Parser($source, $this->_objFactory, $load);
            $this->_trailer = $this->_parser->getTrailer();
            if ($revision !== null) {
                $this->rollback($revision);
            } else {
                $this->_loadPages($this->_trailer->Root->Pages);
            }

            if ($this->_trailer->Info !== null) {
                foreach ($this->_trailer->Info->getKeys() as $key) {
                    $this->properties[$key] = $this->_trailer->Info->$key->value;
                }

                if (isset($this->properties['Trapped'])) {
                    switch ($this->properties['Trapped']) {
                        case 'True':
                            $this->properties['Trapped'] = true;
                            break;

                        case 'False':
                            $this->properties['Trapped'] = false;
                            break;

                        case 'Unknown':
                            $this->properties['Trapped'] = null;
                            break;

                        default:
                            // Wrong property value
                            // Do nothing
                            break;
                    }
                }

                $this->_originalProperties = $this->properties;
            }
        } else {
            $trailerDictionary = new Zend_Pdf_Element_Dictionary();

            /**
             * Document id
             */
            $docId = md5(uniqid(rand(), true));   // 32 byte (128 bit) identifier
            $docIdLow  = substr($docId,  0, 16);  // first 16 bytes
            $docIdHigh = substr($docId, 16, 16);  // second 16 bytes

            $trailerDictionary->ID = new Zend_Pdf_Element_Array();
            $trailerDictionary->ID->items[] = new Zend_Pdf_Element_String_Binary($docIdLow);
            $trailerDictionary->ID->items[] = new Zend_Pdf_Element_String_Binary($docIdHigh);

            $trailerDictionary->Size = new Zend_Pdf_Element_Numeric(0);

            $this->_trailer    = new Zend_Pdf_Trailer_Generator($trailerDictionary);

            /**
             * Document catalog indirect object.
             */
            $docCatalog = $this->_objFactory->newObject(new Zend_Pdf_Element_Dictionary());
            $docCatalog->Type    = new Zend_Pdf_Element_Name('Catalog');
            $docCatalog->Version = new Zend_Pdf_Element_Name(Zend_Pdf::PDF_VERSION);
            $this->_trailer->Root = $docCatalog;

            /**
             * Pages container
             */
            $docPages = $this->_objFactory->newObject(new Zend_Pdf_Element_Dictionary());
            $docPages->Type  = new Zend_Pdf_Element_Name('Pages');
            $docPages->Kids  = new Zend_Pdf_Element_Array();
            $docPages->Count = new Zend_Pdf_Element_Numeric(0);
            $docCatalog->Pages = $docPages;
        }
    }

    /**
     * Retrive number of revisions.
     *
     * @return integer
     */
    public function revisions()
    {
        $revisions = 1;
        $currentTrailer = $this->_trailer;

        while ($currentTrailer->getPrev() !== null && $currentTrailer->getPrev()->Root !== null ) {
            $revisions++;
            $currentTrailer = $currentTrailer->getPrev();
        }

        return $revisions++;
    }

    /**
     * Rollback document $steps number of revisions.
     * This method must be invoked before any changes, applied to the document.
     * Otherwise behavior is undefined.
     *
     * @param integer $steps
     */
    public function rollback($steps)
    {
        for ($count = 0; $count < $steps; $count++) {
            if ($this->_trailer->getPrev() !== null && $this->_trailer->getPrev()->Root !== null) {
                $this->_trailer = $this->_trailer->getPrev();
            } else {
                break;
            }
        }
        $this->_objFactory->setObjectCount($this->_trailer->Size->value);

        // Mark content as modified to force new trailer generation at render time
        $this->_trailer->Root->touch();

        $this->pages = array();
        $this->_loadPages($this->_trailer->Root->Pages);
    }



    /**
     * List of inheritable attributesfor pages tree
     *
     * @var array
     */
    private static $_inheritableAttributes = array('Resources', 'MediaBox', 'CropBox', 'Rotate');


    /**
     * Load pages recursively
     *
     * @param Zend_Pdf_Element_Reference $pages
     * @param array|null $attributes
     */
    private function _loadPages(Zend_Pdf_Element_Reference $pages, $attributes = array())
    {
        if ($pages->getType() != Zend_Pdf_Element::TYPE_DICTIONARY) {
            throw new Zend_Pdf_Exception('Wrong argument');
        }

        foreach ($pages->getKeys() as $property) {
            if (in_array($property, self::$_inheritableAttributes)) {
                $attributes[$property] = $pages->$property;
                $pages->$property = null;
            }
        }


        foreach ($pages->Kids->items as $child) {
            if ($child->Type->value == 'Pages') {
                $this->_loadPages($child, $attributes);
            } else if ($child->Type->value == 'Page') {
                foreach (self::$_inheritableAttributes as $property) {
                    if ($child->$property === null && array_key_exists($property, $attributes)) {
                        /**
                         * Important note.
                         * If any attribute or dependant object is an indirect object, then it's still
                         * shared between pages.
                         */
                        if ($attributes[$property] instanceof Zend_Pdf_Element_Object) {
                            $child->$property = $attributes[$property];
                        } else {
                            $child->$property = $this->_objFactory->newObject($attributes[$property]);
                        }
                    }