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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\Filter;
/**
* Class for handling zlib/deflate encoded data
*/
class Flate implements FilterInterface
{
/**
* Checks whether the zlib extension is loaded.
*
* Used for testing purpose.
*
* @return boolean
* @internal
*/
protected function extensionLoaded()
{
return \extension_loaded('zlib');
}
/**
* Decodes a flate compressed string.
*
* @param string|false $data The input string
* @return string
* @throws FlateException
*/
public function decode($data)
{
if ($this->extensionLoaded()) {
$oData = $data;
$data = (($data !== '') ? @\gzuncompress($data) : '');
if ($data === false) {
// let's try if the checksum is CRC32
$fh = fopen('php://temp', 'w+b');
fwrite($fh, "\x1f\x8b\x08\x00\x00\x00\x00\x00" . $oData);
// "window" == 31 -> 16 + (8 to 15): Uses the low 4 bits of the value as the window size logarithm.
// The input must include a gzip header and trailer (via 16).
stream_filter_append($fh, 'zlib.inflate', STREAM_FILTER_READ, ['window' => 31]);
fseek($fh, 0);
$data = @stream_get_contents($fh);
fclose($fh);
if ($data) {
return $data;
}
// Try this fallback (remove the zlib stream header)
$data = @(gzinflate(substr($oData, 2)));
if ($data === false) {
throw new FlateException(
'Error while decompressing stream.',
FlateException::DECOMPRESS_ERROR
);
}
}
} else {
throw new FlateException(
'To handle FlateDecode filter, enable zlib support in PHP.',
FlateException::NO_ZLIB
);
}
return $data;
}
}