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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; } }
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