diff options
Diffstat (limited to 'vendor/setasign/fpdi/src/PdfReader/PdfReader.php')
| -rw-r--r-- | vendor/setasign/fpdi/src/PdfReader/PdfReader.php | 234 |
1 files changed, 234 insertions, 0 deletions
diff --git a/vendor/setasign/fpdi/src/PdfReader/PdfReader.php b/vendor/setasign/fpdi/src/PdfReader/PdfReader.php new file mode 100644 index 0000000..3ee8878 --- /dev/null +++ b/vendor/setasign/fpdi/src/PdfReader/PdfReader.php @@ -0,0 +1,234 @@ +<?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; + } + + $readPages = function ($kids, $count) use (&$readPages, $readAll) { + $kids = PdfArray::ensure($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; + } + } + }; + + $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); + } +} |