FM / Filter

/home/techb158/ileadtechnology.com/vendor/setasign/fpdi/src/PdfParser/Filter/

/home/techb158/ileadtechnology.com/vendor/setasign/fpdi/src/PdfParser/Filter

Name	Size	Mode	Actions
Ascii85.php	2960	0644	edit dl rm
Ascii85Exception.php	519	0644	edit dl rm
AsciiHex.php	1140	0644	edit dl rm
FilterException.php	486	0644	edit dl rm
FilterInterface.php	486	0644	edit dl rm
Flate.php	2698	0644	edit dl rm
FlateException.php	506	0644	edit dl rm
Lzw.php	4004	0644	edit dl rm
LzwException.php	446	0644	edit dl rm

Edit: /home/techb158/ileadtechnology.com/vendor/setasign/fpdi/src/PdfParser/Filter/Flate.php (2698B)

<?php

/**
 * This file is part of FPDI
 *
 * @package   setasign\Fpdi
 * @copyright Copyright (c) 2023 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
                $tries = 0;

$oDataLen = strlen($oData);
                while ($tries < 6 && ($data === false || (strlen($data) < ($oDataLen - $tries - 1)))) {
                    $data = @(gzinflate(substr($oData, $tries)));
                    $tries++;
                }

// let's use this fallback only if the $data is longer than the original data
                if (strlen($data) > ($oDataLen - $tries - 1)) {
                    return $data;
                }

if (!$data) {
                    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;
    }
}

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 $tries = 0; $oDataLen = strlen($oData); while ($tries < 6 && ($data === false || (strlen($data) < ($oDataLen - $tries - 1)))) { $data = @(gzinflate(substr($oData, $tries))); $tries++; } // let's use this fallback only if the $data is longer than the original data if (strlen($data) > ($oDataLen - $tries - 1)) { return $data; } if (!$data) { 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; } }