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Direktori : /home2/selectio/www/a1tex.in/vendor/setasign/fpdi/src/PdfReader/ |
Current File : /home2/selectio/www/a1tex.in/vendor/setasign/fpdi/src/PdfReader/PdfReader.php |
<?php /** * This file is part of FPDI * * @package setasign\Fpdi * @copyright Copyright (c) 2020 Setasign GmbH & Co. KG (https://www.setasign.com) * @license http://opensource.org/licenses/mit-license The MIT License */ namespace setasign\Fpdi\PdfReader; use setasign\Fpdi\PdfParser\CrossReference\CrossReferenceException; use setasign\Fpdi\PdfParser\PdfParser; use setasign\Fpdi\PdfParser\PdfParserException; use setasign\Fpdi\PdfParser\Type\PdfArray; use setasign\Fpdi\PdfParser\Type\PdfDictionary; use setasign\Fpdi\PdfParser\Type\PdfIndirectObject; use setasign\Fpdi\PdfParser\Type\PdfIndirectObjectReference; use setasign\Fpdi\PdfParser\Type\PdfNumeric; use setasign\Fpdi\PdfParser\Type\PdfType; use setasign\Fpdi\PdfParser\Type\PdfTypeException; /** * A PDF reader class */ class PdfReader { /** * @var PdfParser */ protected $parser; /** * @var int */ protected $pageCount; /** * Indirect objects of resolved pages. * * @var PdfIndirectObjectReference[]|PdfIndirectObject[] */ protected $pages = []; /** * PdfReader constructor. * * @param PdfParser $parser */ public function __construct(PdfParser $parser) { $this->parser = $parser; } /** * PdfReader destructor. */ public function __destruct() { if ($this->parser !== null) { $this->parser->cleanUp(); } } /** * Get the pdf parser instance. * * @return PdfParser */ public function getParser() { return $this->parser; } /** * Get the PDF version. * * @return string * @throws PdfParserException */ public function getPdfVersion() { return \implode('.', $this->parser->getPdfVersion()); } /** * Get the page count. * * @return int * @throws PdfTypeException * @throws CrossReferenceException * @throws PdfParserException */ public function getPageCount() { if ($this->pageCount === null) { $catalog = $this->parser->getCatalog(); $pages = PdfType::resolve(PdfDictionary::get($catalog, 'Pages'), $this->parser); $count = PdfType::resolve(PdfDictionary::get($pages, 'Count'), $this->parser); $this->pageCount = PdfNumeric::ensure($count)->value; } return $this->pageCount; } /** * Get a page instance. * * @param int $pageNumber * @return Page * @throws PdfTypeException * @throws CrossReferenceException * @throws PdfParserException * @throws \InvalidArgumentException */ public function getPage($pageNumber) { if (!\is_numeric($pageNumber)) { throw new \InvalidArgumentException( 'Page number needs to be a number.' ); } if ($pageNumber < 1 || $pageNumber > $this->getPageCount()) { throw new \InvalidArgumentException( \sprintf( 'Page number "%s" out of available page range (1 - %s)', $pageNumber, $this->getPageCount() ) ); } $this->readPages(); $page = $this->pages[$pageNumber - 1]; if ($page instanceof PdfIndirectObjectReference) { $readPages = function ($kids) use (&$readPages) { $kids = PdfArray::ensure($kids); /** @noinspection LoopWhichDoesNotLoopInspection */ foreach ($kids->value as $reference) { $reference = PdfIndirectObjectReference::ensure($reference); $object = $this->parser->getIndirectObject($reference->value); $type = PdfDictionary::get($object->value, 'Type'); if ($type->value === 'Pages') { return $readPages(PdfDictionary::get($object->value, 'Kids')); } return $object; } throw new PdfReaderException( 'Kids array cannot be empty.', PdfReaderException::KIDS_EMPTY ); }; $page = $this->parser->getIndirectObject($page->value); $dict = PdfType::resolve($page, $this->parser); $type = PdfDictionary::get($dict, 'Type'); if ($type->value === 'Pages') { $kids = PdfType::resolve(PdfDictionary::get($dict, 'Kids'), $this->parser); try { $page = $this->pages[$pageNumber - 1] = $readPages($kids); } catch (PdfReaderException $e) { if ($e->getCode() !== PdfReaderException::KIDS_EMPTY) { throw $e; } // let's reset the pages array and read all page objects $this->pages = []; $this->readPages(true); // @phpstan-ignore-next-line $page = $this->pages[$pageNumber - 1]; } } else { $this->pages[$pageNumber - 1] = $page; } } return new Page($page, $this->parser); } /** * Walk the page tree and resolve all indirect objects of all pages. * * @param bool $readAll * @throws CrossReferenceException * @throws PdfParserException * @throws PdfTypeException */ protected function readPages($readAll = false) { if (\count($this->pages) > 0) { return; } $expectedPageCount = $this->getPageCount(); $readPages = function ($kids, $count) use (&$readPages, $readAll, $expectedPageCount) { $kids = PdfArray::ensure($kids); $isLeaf = ($count->value === \count($kids->value)); foreach ($kids->value as $reference) { $reference = PdfIndirectObjectReference::ensure($reference); if (!$readAll && $isLeaf) { $this->pages[] = $reference; continue; } $object = $this->parser->getIndirectObject($reference->value); $type = PdfDictionary::get($object->value, 'Type'); if ($type->value === 'Pages') { $readPages(PdfDictionary::get($object->value, 'Kids'), PdfDictionary::get($object->value, 'Count')); } else { $this->pages[] = $object; } // stop if all pages are read - faulty documents exists with additional entries with invalid data. if (count($this->pages) === $expectedPageCount) { break; } } }; $catalog = $this->parser->getCatalog(); $pages = PdfType::resolve(PdfDictionary::get($catalog, 'Pages'), $this->parser); $count = PdfType::resolve(PdfDictionary::get($pages, 'Count'), $this->parser); $kids = PdfType::resolve(PdfDictionary::get($pages, 'Kids'), $this->parser); $readPages($kids, $count); } }