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<?php
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/**
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* This file is part of FPDI
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*
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* @package setasign\Fpdi
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* @copyright Copyright (c) 2023 Setasign GmbH & Co. KG (https://www.setasign.com)
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* @license http://opensource.org/licenses/mit-license The MIT License
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*/
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namespace setasign\Fpdi\PdfParser\Type;
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use setasign\Fpdi\PdfParser\CrossReference\CrossReferenceException;
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use setasign\Fpdi\PdfParser\PdfParser;
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use setasign\Fpdi\PdfParser\PdfParserException;
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/**
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* A class defining a PDF data type
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*/
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class PdfType
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{
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/**
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* Resolves a PdfType value to its value.
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*
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* This method is used to evaluate indirect and direct object references until a final value is reached.
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*
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* @param PdfType $value
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* @param PdfParser $parser
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* @param bool $stopAtIndirectObject
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* @return PdfType
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* @throws CrossReferenceException
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* @throws PdfParserException
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*/
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public static function resolve(PdfType $value, PdfParser $parser, $stopAtIndirectObject = false)
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{
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if ($value instanceof PdfIndirectObject) {
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if ($stopAtIndirectObject === true) {
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return $value;
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}
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return self::resolve($value->value, $parser, $stopAtIndirectObject);
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}
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if ($value instanceof PdfIndirectObjectReference) {
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return self::resolve($parser->getIndirectObject($value->value), $parser, $stopAtIndirectObject);
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}
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return $value;
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}
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/**
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* Ensure that a value is an instance of a specific PDF type.
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*
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* @param string $type
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* @param PdfType $value
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* @param string $errorMessage
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* @return mixed
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* @throws PdfTypeException
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*/
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protected static function ensureType($type, $value, $errorMessage)
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{
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if (!($value instanceof $type)) {
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throw new PdfTypeException(
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$errorMessage,
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PdfTypeException::INVALID_DATA_TYPE
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);
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}
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return $value;
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}
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/**
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* Flatten indirect object references to direct objects.
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*
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* @param PdfType $value
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* @param PdfParser $parser
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* @return PdfType
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* @throws CrossReferenceException
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* @throws PdfParserException
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*/
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public static function flatten(PdfType $value, PdfParser $parser)
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{
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if ($value instanceof PdfIndirectObjectReference) {
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return self::flatten(self::resolve($value, $parser), $parser);
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}
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if ($value instanceof PdfDictionary || $value instanceof PdfArray) {
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foreach ($value->value as $key => $_value) {
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$value->value[$key] = self::flatten($_value, $parser);
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}
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}
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if ($value instanceof PdfStream) {
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throw new PdfTypeException('There is a stream object found which cannot be flattened to a direct object.');
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}
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return $value;
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}
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/**
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* The value of the PDF type.
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*
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* @var mixed
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*/
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public $value;
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}
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