fpdi_pdf_parser.php

<?php
//
//  FPDI - Version 1.4.1
//
//    Copyright 2004-2011 Setasign - Jan Slabon
//
//  Licensed under the Apache License, Version 2.0 (the "License");
//  you may not use this file except in compliance with the License.
//  You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
//  Unless required by applicable law or agreed to in writing, software
//  distributed under the License is distributed on an "AS IS" BASIS,
//  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//  See the License for the specific language governing permissions and
//  limitations under the License.
//

require_once('pdf_parser.php');

class fpdi_pdf_parser extends pdf_parser {

    /**
     * Pages
     * Index beginns at 0
     *
     * @var array
     */
    var $pages;
    
    /**
     * Page count
     * @var integer
     */
    var $page_count;
    
    /**
     * actual page number
     * @var integer
     */
    var $pageno;
    
    /**
     * PDF Version of imported Document
     * @var string
     */
    var $pdfVersion;
    
    /**
     * FPDI Reference
     * @var object
     */
    var $fpdi;
    
    /**
     * Available BoxTypes
     *
     * @var array
     */
    var $availableBoxes = array('/MediaBox', '/CropBox', '/BleedBox', '/TrimBox', '/ArtBox');
        
    /**
     * Constructor
     *
     * @param string $filename  Source-Filename
     * @param object $fpdi      Object of type fpdi
     */
    function fpdi_pdf_parser($filename, &$fpdi) {
        $this->fpdi =& $fpdi;
		
        parent::pdf_parser($filename);

        // resolve Pages-Dictonary
        $pages = $this->pdf_resolve_object($this->c, $this->root[1][1]['/Pages']);

        // Read pages
        $this->read_pages($this->c, $pages, $this->pages);
        
        // count pages;
        $this->page_count = count($this->pages);
    }
    
    /**
     * Overwrite parent::error()
     *
     * @param string $msg  Error-Message
     */
    function error($msg) {
    	$this->fpdi->error($msg);	
    }
    
    /**
     * Get pagecount from sourcefile
     *
     * @return int
     */
    function getPageCount() {
        return $this->page_count;
    }


    /**
     * Set pageno
     *
     * @param int $pageno Pagenumber to use
     */
    function setPageno($pageno) {
        $pageno = ((int) $pageno) - 1;

        if ($pageno < 0 || $pageno >= $this->getPageCount()) {
            $this->fpdi->error('Pagenumber is wrong!');
        }

        $this->pageno = $pageno;
    }
    
    /**
     * Get page-resources from current page
     *
     * @return array
     */
    function getPageResources() {
        return $this->_getPageResources($this->pages[$this->pageno]);
    }
    
    /**
     * Get page-resources from /Page
     *
     * @param array $obj Array of pdf-data
     */
    function _getPageResources ($obj) { // $obj = /Page
    	$obj = $this->pdf_resolve_object($this->c, $obj);

        // If the current object has a resources
    	// dictionary associated with it, we use
    	// it. Otherwise, we move back to its
    	// parent object.
        if (isset ($obj[1][1]['/Resources'])) {
    		$res = $this->pdf_resolve_object($this->c, $obj[1][1]['/Resources']);
    		if ($res[0] == PDF_TYPE_OBJECT)
                return $res[1];
            return $res;
    	} else {
    		if (!isset ($obj[1][1]['/Parent'])) {
    			return false;
    		} else {
                $res = $this->_getPageResources($obj[1][1]['/Parent']);
                if ($res[0] == PDF_TYPE_OBJECT)
                    return $res[1];
                return $res;
    		}
    	}
    }


    /**
     * Get content of current page
     *
     * If more /Contents is an array, the streams are concated
     *
     * @return string
     */
    function getContent() {
        $buffer = '';
        
        if (isset($this->pages[$this->pageno][1][1]['/Contents'])) {
            $contents = $this->_getPageContent($this->pages[$this->pageno][1][1]['/Contents']);
            foreach($contents AS $tmp_content) {
                $buffer .= $this->_rebuildContentStream($tmp_content) . ' ';
            }
        }
        
        return $buffer;
    }
    
    
    /**
     * Resolve all content-objects
     *
     * @param array $content_ref
     * @return array
     */
    function _getPageContent($content_ref) {
        $contents = array();
        
        if ($content_ref[0] == PDF_TYPE_OBJREF) {
            $content = $this->pdf_resolve_object($this->c, $content_ref);
            if ($content[1][0] == PDF_TYPE_ARRAY) {
                $contents = $this->_getPageContent($content[1]);
            } else {
                $contents[] = $content;
            }
        } else if ($content_ref[0] == PDF_TYPE_ARRAY) {
            foreach ($content_ref[1] AS $tmp_content_ref) {
                $contents = array_merge($contents,$this->_getPageContent($tmp_content_ref));
            }
        }

        return $contents;
    }


    /**
     * Rebuild content-streams
     *
     * @param array $obj
     * @return string
     */
    function _rebuildContentStream($obj) {
        $filters = array();
        
        if (isset($obj[1][1]['/Filter'])) {
            $_filter = $obj[1][1]['/Filter'];

            if ($_filter[0] == PDF_TYPE_OBJREF) {
                $tmpFilter = $this->pdf_resolve_object($this->c, $_filter);
                $_filter = $tmpFilter[1];
            }
            
            if ($_filter[0] == PDF_TYPE_TOKEN) {
                $filters[] = $_filter;
            } else if ($_filter[0] == PDF_TYPE_ARRAY) {
                $filters = $_filter[1];
            }
        }

        $stream = $obj[2][1];

        foreach ($filters AS $_filter) {
            switch ($_filter[1]) {
                case '/FlateDecode':
                case '/Fl':
                	// $stream .= "\x0F\x0D"; // in an errorious stream this suffix could work
                	// $stream .= "\x0A";
                	// $stream .= "\x0D";
                	if (function_exists('gzuncompress')) {
                        $stream = (strlen($stream) > 0) ? @gzuncompress($stream) : '';
                    } else {
                        $this->error(sprintf('To handle %s filter, please compile php with zlib support.',$_filter[1]));
                    }
                    
                    if ($stream === false) {
                    	$this->error('Error while decompressing stream.');
                    }
                break;
                case '/LZWDecode':
                    include_once('filters/FilterLZW_FPDI.php');
                    $decoder = new FilterLZW_FPDI($this->fpdi);
                    $stream = $decoder->decode($stream);
                    break;
                case '/ASCII85Decode':
                    include_once('filters/FilterASCII85_FPDI.php');
                    $decoder = new FilterASCII85_FPDI($this->fpdi);
                    $stream = $decoder->decode($stream);
                    break;
                case null:
                    $stream = $stream;
                break;
                default:
                    $this->error(sprintf('Unsupported Filter: %s',$_filter[1]));
            }
        }
        
        return $stream;
    }
    
    
    /**
     * Get a Box from a page
     * Arrayformat is same as used by fpdf_tpl
     *
     * @param array $page a /Page
     * @param string $box_index Type of Box @see $availableBoxes
     * @param float Scale factor from user space units to points
     * @return array
     */
    function getPageBox($page, $box_index, $k) {
        $page = $this->pdf_resolve_object($this->c, $page);
        $box = null;
        if (isset($page[1][1][$box_index]))
            $box =& $page[1][1][$box_index];
        
        if (!is_null($box) && $box[0] == PDF_TYPE_OBJREF) {
            $tmp_box = $this->pdf_resolve_object($this->c, $box);
            $box = $tmp_box[1];
        }
            
        if (!is_null($box) && $box[0] == PDF_TYPE_ARRAY) {
            $b =& $box[1];
            return array('x' => $b[0][1]/$k,
                         'y' => $b[1][1]/$k,
                         'w' => abs($b[0][1]-$b[2][1])/$k,
                         'h' => abs($b[1][1]-$b[3][1])/$k,
                         'llx' => min($b[0][1], $b[2][1])/$k,
                         'lly' => min($b[1][1], $b[3][1])/$k,
                         'urx' => max($b[0][1], $b[2][1])/$k,
                         'ury' => max($b[1][1], $b[3][1])/$k,
                         );
        } else if (!isset ($page[1][1]['/Parent'])) {
            return false;
        } else {
            return $this->getPageBox($this->pdf_resolve_object($this->c, $page[1][1]['/Parent']), $box_index, $k);
        }
    }

    /**
     * Get all page boxes by page no
     * 
     * @param int The page number
     * @param float Scale factor from user space units to points
     * @return array
     */
     function getPageBoxes($pageno, $k) {
        return $this->_getPageBoxes($this->pages[$pageno-1], $k);
    }
    
    /**
     * Get all boxes from /Page
     *
     * @param array a /Page
     * @return array
     */
    function _getPageBoxes($page, $k) {
        $boxes = array();

        foreach($this->availableBoxes AS $box) {
            if ($_box = $this->getPageBox($page, $box, $k)) {
                $boxes[$box] = $_box;
            }
        }

        return $boxes;
    }

    /**
     * Get the page rotation by pageno
     *
     * @param integer $pageno
     * @return array
     */
    function getPageRotation($pageno) {
        return $this->_getPageRotation($this->pages[$pageno-1]);
    }
    
    function _getPageRotation($obj) { // $obj = /Page
    	$obj = $this->pdf_resolve_object($this->c, $obj);
    	if (isset ($obj[1][1]['/Rotate'])) {
    		$res = $this->pdf_resolve_object($this->c, $obj[1][1]['/Rotate']);
    		if ($res[0] == PDF_TYPE_OBJECT)
                return $res[1];
            return $res;
    	} else {
    		if (!isset ($obj[1][1]['/Parent'])) {
    			return false;
    		} else {
                $res = $this->_getPageRotation($obj[1][1]['/Parent']);
                if ($res[0] == PDF_TYPE_OBJECT)
                    return $res[1];
                return $res;
    		}
    	}
    }
    
    /**
     * Read all /Page(es)
     *
     * @param object pdf_context
     * @param array /Pages
     * @param array the result-array
     */
    function read_pages(&$c, &$pages, &$result) {
        // Get the kids dictionary
    	$_kids = $this->pdf_resolve_object ($c, $pages[1][1]['/Kids']);
        
        if (!is_array($_kids))
            $this->error('Cannot find /Kids in current /Page-Dictionary');
            
        if ($_kids[1][0] == PDF_TYPE_ARRAY) {
            $kids = $_kids[1][1];
        } else {
            $kids = $_kids[1];
        }
        
        foreach ($kids as $v) {
    		$pg = $this->pdf_resolve_object ($c, $v);
            if ($pg[1][1]['/Type'][1] === '/Pages') {
                // If one of the kids is an embedded
    			// /Pages array, resolve it as well.
                $this->read_pages($c, $pg, $result);
    		} else {
    			$result[] = $pg;
    		}
    	}
    }

    
    
    /**
     * Get PDF-Version
     *
     * And reset the PDF Version used in FPDI if needed
     */
    function getPDFVersion() {
        parent::getPDFVersion();
        $this->fpdi->setPDFVersion(max($this->fpdi->getPDFVersion(), $this->pdfVersion));
    }
    
}