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<?php
/**
* This file is part of FPDI
*
* @package setasign\Fpdi
* @copyright Copyright (c) 2024 Setasign GmbH & Co. KG (https://www.setasign.com)
* @license http://opensource.org/licenses/mit-license The MIT License
*/
namespace setasign\Fpdi\PdfParser\CrossReference;
use setasign\Fpdi\PdfParser\PdfParser;
use setasign\Fpdi\PdfParser\Type\PdfDictionary;
use setasign\Fpdi\PdfParser\Type\PdfToken;
use setasign\Fpdi\PdfParser\Type\PdfTypeException;
/**
* Abstract class for cross-reference reader classes.
*/
abstract class AbstractReader
{
/**
* @var PdfParser
*/
protected $parser;
/**
* @var PdfDictionary
*/
protected $trailer;
/**
* AbstractReader constructor.
*
* @param PdfParser $parser
* @throws CrossReferenceException
*/
public function __construct(PdfParser $parser)
{
$this->parser = $parser;
$this->readTrailer();
}
/**
* Get the trailer dictionary.
*
* @return PdfDictionary
*/
public function getTrailer()
{
return $this->trailer;
}
/**
* Read the trailer dictionary.
*
* @throws CrossReferenceException
*/
protected function readTrailer()
{
try {
$trailerKeyword = $this->parser->readValue(null, PdfToken::class);
if ($trailerKeyword->value !== 'trailer') {
throw new CrossReferenceException(
\sprintf(
'Unexpected end of cross reference. "trailer"-keyword expected, got: %s.',
$trailerKeyword->value
),
CrossReferenceException::UNEXPECTED_END
);
}
} catch (PdfTypeException $e) {
throw new CrossReferenceException(
'Unexpected end of cross reference. "trailer"-keyword expected, got an invalid object type.',
CrossReferenceException::UNEXPECTED_END,
$e
);
}
try {
$trailer = $this->parser->readValue(null, PdfDictionary::class);
} catch (PdfTypeException $e) {
throw new CrossReferenceException(
'Unexpected end of cross reference. Trailer not found.',
CrossReferenceException::UNEXPECTED_END,
$e
);
}
$this->trailer = $trailer;
}
}
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