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<?phpdeclare(strict_types=1);/*** SimplePie** A PHP-Based RSS and Atom Feed Framework.* Takes the hard work out of managing a complete RSS/Atom solution.** Copyright (c) 2004-2022, Ryan Parman, Sam Sneddon, Ryan McCue, and contributors* All rights reserved.** Redistribution and use in source and binary forms, with or without modification, are* permitted provided that the following conditions are met:** * Redistributions of source code must retain the above copyright notice, this list of* conditions and the following disclaimer.** * Redistributions in binary form must reproduce the above copyright notice, this list* of conditions and the following disclaimer in the documentation and/or other materials* provided with the distribution.** * Neither the name of the SimplePie Team nor the names of its contributors may be used* to endorse or promote products derived from this software without specific prior* written permission.** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS* AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE* POSSIBILITY OF SUCH DAMAGE.** @package SimplePie* @copyright 2004-2016 Ryan Parman, Sam Sneddon, Ryan McCue* @author Ryan Parman* @author Sam Sneddon* @author Ryan McCue* @link http://simplepie.org/ SimplePie* @license http://www.opensource.org/licenses/bsd-license.php BSD License*/namespace SimplePie;/*** Decode 'gzip' encoded HTTP data** @package SimplePie* @subpackage HTTP* @link http://www.gzip.org/format.txt*/class Gzdecode{/*** Compressed data** @access private* @var string* @see gzdecode::$data*/public $compressed_data;/*** Size of compressed data** @access private* @var int*/public $compressed_size;/*** Minimum size of a valid gzip string** @access private* @var int*/public $min_compressed_size = 18;/*** Current position of pointer** @access private* @var int*/public $position = 0;/*** Flags (FLG)** @access private* @var int*/public $flags;/*** Uncompressed data** @access public* @see gzdecode::$compressed_data* @var string*/public $data;/*** Modified time** @access public* @var int*/public $MTIME;/*** Extra Flags** @access public* @var int*/public $XFL;/*** Operating System** @access public* @var int*/public $OS;/*** Subfield ID 1** @access public* @see gzdecode::$extra_field* @see gzdecode::$SI2* @var string*/public $SI1;/*** Subfield ID 2** @access public* @see gzdecode::$extra_field* @see gzdecode::$SI1* @var string*/public $SI2;/*** Extra field content** @access public* @see gzdecode::$SI1* @see gzdecode::$SI2* @var string*/public $extra_field;/*** Original filename** @access public* @var string*/public $filename;/*** Human readable comment** @access public* @var string*/public $comment;/*** Don't allow anything to be set** @param string $name* @param mixed $value*/public function __set($name, $value){trigger_error("Cannot write property $name", E_USER_ERROR);}/*** Set the compressed string and related properties** @param string $data*/public function __construct($data){$this->compressed_data = $data;$this->compressed_size = strlen($data);}/*** Decode the GZIP stream** @return bool Successfulness*/public function parse(){if ($this->compressed_size >= $this->min_compressed_size) {$len = 0;// Check ID1, ID2, and CMif (substr($this->compressed_data, 0, 3) !== "\x1F\x8B\x08") {return false;}// Get the FLG (FLaGs)$this->flags = ord($this->compressed_data[3]);// FLG bits above (1 << 4) are reservedif ($this->flags > 0x1F) {return false;}// Advance the pointer after the above$this->position += 4;// MTIME$mtime = substr($this->compressed_data, $this->position, 4);// Reverse the string if we're on a big-endian arch because l is the only signed long and is machine endiannessif (current(unpack('S', "\x00\x01")) === 1) {$mtime = strrev($mtime);}$this->MTIME = current(unpack('l', $mtime));$this->position += 4;// Get the XFL (eXtra FLags)$this->XFL = ord($this->compressed_data[$this->position++]);// Get the OS (Operating System)$this->OS = ord($this->compressed_data[$this->position++]);// Parse the FEXTRAif ($this->flags & 4) {// Read subfield IDs$this->SI1 = $this->compressed_data[$this->position++];$this->SI2 = $this->compressed_data[$this->position++];// SI2 set to zero is reserved for future useif ($this->SI2 === "\x00") {return false;}// Get the length of the extra field$len = current(unpack('v', substr($this->compressed_data, $this->position, 2)));$this->position += 2;// Check the length of the string is still valid$this->min_compressed_size += $len + 4;if ($this->compressed_size >= $this->min_compressed_size) {// Set the extra field to the given data$this->extra_field = substr($this->compressed_data, $this->position, $len);$this->position += $len;} else {return false;}}// Parse the FNAMEif ($this->flags & 8) {// Get the length of the filename$len = strcspn($this->compressed_data, "\x00", $this->position);// Check the length of the string is still valid$this->min_compressed_size += $len + 1;if ($this->compressed_size >= $this->min_compressed_size) {// Set the original filename to the given string$this->filename = substr($this->compressed_data, $this->position, $len);$this->position += $len + 1;} else {return false;}}// Parse the FCOMMENTif ($this->flags & 16) {// Get the length of the comment$len = strcspn($this->compressed_data, "\x00", $this->position);// Check the length of the string is still valid$this->min_compressed_size += $len + 1;if ($this->compressed_size >= $this->min_compressed_size) {// Set the original comment to the given string$this->comment = substr($this->compressed_data, $this->position, $len);$this->position += $len + 1;} else {return false;}}// Parse the FHCRCif ($this->flags & 2) {// Check the length of the string is still valid$this->min_compressed_size += $len + 2;if ($this->compressed_size >= $this->min_compressed_size) {// Read the CRC$crc = current(unpack('v', substr($this->compressed_data, $this->position, 2)));// Check the CRC matchesif ((crc32(substr($this->compressed_data, 0, $this->position)) & 0xFFFF) === $crc) {$this->position += 2;} else {return false;}} else {return false;}}// Decompress the actual dataif (($this->data = gzinflate(substr($this->compressed_data, $this->position, -8))) === false) {return false;}$this->position = $this->compressed_size - 8;// Check CRC of data$crc = current(unpack('V', substr($this->compressed_data, $this->position, 4)));$this->position += 4;/*if (extension_loaded('hash') && sprintf('%u', current(unpack('V', hash('crc32b', $this->data)))) !== sprintf('%u', $crc)){return false;}*/// Check ISIZE of data$isize = current(unpack('V', substr($this->compressed_data, $this->position, 4)));$this->position += 4;if (sprintf('%u', strlen($this->data) & 0xFFFFFFFF) !== sprintf('%u', $isize)) {return false;}// Wow, against all odds, we've actually got a valid gzip stringreturn true;}return false;}}class_alias('SimplePie\Gzdecode', 'SimplePie_gzdecode');