diff options
Diffstat (limited to 'vendor/setasign/fpdi/src/PdfParser/PdfParser.php')
| -rw-r--r-- | vendor/setasign/fpdi/src/PdfParser/PdfParser.php | 381 |
1 files changed, 381 insertions, 0 deletions
diff --git a/vendor/setasign/fpdi/src/PdfParser/PdfParser.php b/vendor/setasign/fpdi/src/PdfParser/PdfParser.php new file mode 100644 index 0000000..f724314 --- /dev/null +++ b/vendor/setasign/fpdi/src/PdfParser/PdfParser.php @@ -0,0 +1,381 @@ +<?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\PdfParser; + +use setasign\Fpdi\PdfParser\CrossReference\CrossReference; +use setasign\Fpdi\PdfParser\CrossReference\CrossReferenceException; +use setasign\Fpdi\PdfParser\Type\PdfArray; +use setasign\Fpdi\PdfParser\Type\PdfBoolean; +use setasign\Fpdi\PdfParser\Type\PdfDictionary; +use setasign\Fpdi\PdfParser\Type\PdfHexString; +use setasign\Fpdi\PdfParser\Type\PdfIndirectObject; +use setasign\Fpdi\PdfParser\Type\PdfIndirectObjectReference; +use setasign\Fpdi\PdfParser\Type\PdfName; +use setasign\Fpdi\PdfParser\Type\PdfNull; +use setasign\Fpdi\PdfParser\Type\PdfNumeric; +use setasign\Fpdi\PdfParser\Type\PdfStream; +use setasign\Fpdi\PdfParser\Type\PdfString; +use setasign\Fpdi\PdfParser\Type\PdfToken; +use setasign\Fpdi\PdfParser\Type\PdfType; + +/** + * A PDF parser class + */ +class PdfParser +{ + /** + * @var StreamReader + */ + protected $streamReader; + + /** + * @var Tokenizer + */ + protected $tokenizer; + + /** + * The file header. + * + * @var string + */ + protected $fileHeader; + + /** + * The offset to the file header. + * + * @var int + */ + protected $fileHeaderOffset; + + /** + * @var CrossReference|null + */ + protected $xref; + + /** + * All read objects. + * + * @var array + */ + protected $objects = []; + + /** + * PdfParser constructor. + * + * @param StreamReader $streamReader + */ + public function __construct(StreamReader $streamReader) + { + $this->streamReader = $streamReader; + $this->tokenizer = new Tokenizer($streamReader); + } + + /** + * Removes cycled references. + * + * @internal + */ + public function cleanUp() + { + $this->xref = null; + } + + /** + * Get the stream reader instance. + * + * @return StreamReader + */ + public function getStreamReader() + { + return $this->streamReader; + } + + /** + * Get the tokenizer instance. + * + * @return Tokenizer + */ + public function getTokenizer() + { + return $this->tokenizer; + } + + /** + * Resolves the file header. + * + * @throws PdfParserException + * @return int + */ + protected function resolveFileHeader() + { + if ($this->fileHeader) { + return $this->fileHeaderOffset; + } + + $this->streamReader->reset(0); + $maxIterations = 1000; + while (true) { + $buffer = $this->streamReader->getBuffer(false); + $offset = \strpos($buffer, '%PDF-'); + if ($offset === false) { + if (!$this->streamReader->increaseLength(100) || (--$maxIterations === 0)) { + throw new PdfParserException( + 'Unable to find PDF file header.', + PdfParserException::FILE_HEADER_NOT_FOUND + ); + } + continue; + } + break; + } + + $this->fileHeaderOffset = $offset; + $this->streamReader->setOffset($offset); + + $this->fileHeader = \trim($this->streamReader->readLine()); + return $this->fileHeaderOffset; + } + + /** + * Get the cross reference instance. + * + * @return CrossReference + * @throws CrossReferenceException + * @throws PdfParserException + */ + public function getCrossReference() + { + if ($this->xref === null) { + $this->xref = new CrossReference($this, $this->resolveFileHeader()); + } + + return $this->xref; + } + + /** + * Get the PDF version. + * + * @return int[] An array of major and minor version. + * @throws PdfParserException + */ + public function getPdfVersion() + { + $this->resolveFileHeader(); + + if (\preg_match('/%PDF-(\d)\.(\d)/', $this->fileHeader, $result) === 0) { + throw new PdfParserException( + 'Unable to extract PDF version from file header.', + PdfParserException::PDF_VERSION_NOT_FOUND + ); + } + list(, $major, $minor) = $result; + + $catalog = $this->getCatalog(); + if (isset($catalog->value['Version'])) { + $versionParts = \explode( + '.', + PdfName::unescape(PdfType::resolve($catalog->value['Version'], $this)->value) + ); + if (count($versionParts) === 2) { + list($major, $minor) = $versionParts; + } + } + + return [(int) $major, (int) $minor]; + } + + /** + * Get the catalog dictionary. + * + * @return PdfDictionary + * @throws Type\PdfTypeException + * @throws CrossReferenceException + * @throws PdfParserException + */ + public function getCatalog() + { + $trailer = $this->getCrossReference()->getTrailer(); + + $catalog = PdfType::resolve(PdfDictionary::get($trailer, 'Root'), $this); + + return PdfDictionary::ensure($catalog); + } + + /** + * Get an indirect object by its object number. + * + * @param int $objectNumber + * @param bool $cache + * @return PdfIndirectObject + * @throws CrossReferenceException + * @throws PdfParserException + */ + public function getIndirectObject($objectNumber, $cache = false) + { + $objectNumber = (int) $objectNumber; + if (isset($this->objects[$objectNumber])) { + return $this->objects[$objectNumber]; + } + + $object = $this->getCrossReference()->getIndirectObject($objectNumber); + + if ($cache) { + $this->objects[$objectNumber] = $object; + } + + return $object; + } + + /** + * Read a PDF value. + * + * @param null|bool|string $token + * @param null|string $expectedType + * @return false|PdfArray|PdfBoolean|PdfDictionary|PdfHexString|PdfIndirectObject|PdfIndirectObjectReference|PdfName|PdfNull|PdfNumeric|PdfStream|PdfString|PdfToken + * @throws Type\PdfTypeException + */ + public function readValue($token = null, $expectedType = null) + { + if ($token === null) { + $token = $this->tokenizer->getNextToken(); + } + + if ($token === false) { + if ($expectedType !== null) { + throw new Type\PdfTypeException('Got unexpected token type.', Type\PdfTypeException::INVALID_DATA_TYPE); + } + return false; + } + + switch ($token) { + case '(': + $this->ensureExpectedType($token, $expectedType); + return PdfString::parse($this->streamReader); + + case '<': + if ($this->streamReader->getByte() === '<') { + $this->ensureExpectedType('<<', $expectedType); + $this->streamReader->addOffset(1); + return PdfDictionary::parse($this->tokenizer, $this->streamReader, $this); + } + + $this->ensureExpectedType($token, $expectedType); + return PdfHexString::parse($this->streamReader); + + case '/': + $this->ensureExpectedType($token, $expectedType); + return PdfName::parse($this->tokenizer, $this->streamReader); + + case '[': + $this->ensureExpectedType($token, $expectedType); + return PdfArray::parse($this->tokenizer, $this); + + default: + if (\is_numeric($token)) { + if (($token2 = $this->tokenizer->getNextToken()) !== false) { + if (\is_numeric($token2) && ($token3 = $this->tokenizer->getNextToken()) !== false) { + switch ($token3) { + case 'obj': + if ($expectedType !== null && $expectedType !== PdfIndirectObject::class) { + throw new Type\PdfTypeException( + 'Got unexpected token type.', + Type\PdfTypeException::INVALID_DATA_TYPE + ); + } + + return PdfIndirectObject::parse( + (int) $token, + (int) $token2, + $this, + $this->tokenizer, + $this->streamReader + ); + case 'R': + if ( + $expectedType !== null && + $expectedType !== PdfIndirectObjectReference::class + ) { + throw new Type\PdfTypeException( + 'Got unexpected token type.', + Type\PdfTypeException::INVALID_DATA_TYPE + ); + } + + return PdfIndirectObjectReference::create((int) $token, (int) $token2); + } + + $this->tokenizer->pushStack($token3); + } + + $this->tokenizer->pushStack($token2); + } + + if ($expectedType !== null && $expectedType !== PdfNumeric::class) { + throw new Type\PdfTypeException( + 'Got unexpected token type.', + Type\PdfTypeException::INVALID_DATA_TYPE + ); + } + return PdfNumeric::create($token + 0); + } + + if ($token === 'true' || $token === 'false') { + $this->ensureExpectedType($token, $expectedType); + return PdfBoolean::create($token === 'true'); + } + + if ($token === 'null') { + $this->ensureExpectedType($token, $expectedType); + return new PdfNull(); + } + + if ($expectedType !== null && $expectedType !== PdfToken::class) { + throw new Type\PdfTypeException( + 'Got unexpected token type.', + Type\PdfTypeException::INVALID_DATA_TYPE + ); + } + + $v = new PdfToken(); + $v->value = $token; + + return $v; + } + } + + /** + * Ensures that the token will evaluate to an expected object type (or not). + * + * @param string $token + * @param string|null $expectedType + * @return bool + * @throws Type\PdfTypeException + */ + private function ensureExpectedType($token, $expectedType) + { + static $mapping = [ + '(' => PdfString::class, + '<' => PdfHexString::class, + '<<' => PdfDictionary::class, + '/' => PdfName::class, + '[' => PdfArray::class, + 'true' => PdfBoolean::class, + 'false' => PdfBoolean::class, + 'null' => PdfNull::class + ]; + + if ($expectedType === null || $mapping[$token] === $expectedType) { + return true; + } + + throw new Type\PdfTypeException('Got unexpected token type.', Type\PdfTypeException::INVALID_DATA_TYPE); + } +} |