<?php

> 
/**
> declare(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) 2004-2016, Ryan Parman, Geoffrey Sneddon, Ryan McCue, and contributors



>  * 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, Geoffrey Sneddon, Ryan McCue



>  * @copyright 2004-2016 Ryan Parman, Sam Sneddon, Ryan McCue


 * @author Ryan Parman

<  * @author Geoffrey Sneddon



>  * @author Sam Sneddon


 * @author Ryan McCue
 * @link http://simplepie.org/ SimplePie
 * @license http://www.opensource.org/licenses/bsd-license.php BSD License
 */


> use SimplePie\Gzdecode;




< /**
<  * Decode 'gzip' encoded HTTP data
<  *
<  * @package SimplePie
<  * @subpackage HTTP
<  * @link http://www.gzip.org/format.txt
<  */
< class SimplePie_gzdecode
< {
< 	/**
< 	 * Compressed data
< 	 *
< 	 * @access private
< 	 * @var string
< 	 * @see gzdecode::$data
< 	 */
< 	var $compressed_data;
< 
< 	/**
< 	 * Size of compressed data
< 	 *
< 	 * @access private
< 	 * @var int
< 	 */
< 	var $compressed_size;
< 
< 	/**
< 	 * Minimum size of a valid gzip string
< 	 *
< 	 * @access private
< 	 * @var int
< 	 */
< 	var $min_compressed_size = 18;
< 
< 	/**
< 	 * Current position of pointer
< 	 *
< 	 * @access private
< 	 * @var int
< 	 */
< 	var $position = 0;
< 
< 	/**
< 	 * Flags (FLG)
< 	 *
< 	 * @access private
< 	 * @var int
< 	 */
< 	var $flags;
< 
< 	/**
< 	 * Uncompressed data
< 	 *
< 	 * @access public
< 	 * @see gzdecode::$compressed_data
< 	 * @var string
< 	 */
< 	var $data;
< 
< 	/**
< 	 * Modified time
< 	 *
< 	 * @access public
< 	 * @var int
< 	 */
< 	var $MTIME;
< 
< 	/**
< 	 * Extra Flags
< 	 *
< 	 * @access public
< 	 * @var int
< 	 */
< 	var $XFL;
< 
< 	/**
< 	 * Operating System
< 	 *
< 	 * @access public
< 	 * @var int
< 	 */
< 	var $OS;
< 
< 	/**
< 	 * Subfield ID 1
< 	 *
< 	 * @access public
< 	 * @see gzdecode::$extra_field
< 	 * @see gzdecode::$SI2
< 	 * @var string
< 	 */
< 	var $SI1;
< 
< 	/**
< 	 * Subfield ID 2
< 	 *
< 	 * @access public
< 	 * @see gzdecode::$extra_field
< 	 * @see gzdecode::$SI1
< 	 * @var string
< 	 */
< 	var $SI2;
< 
< 	/**
< 	 * Extra field content
< 	 *
< 	 * @access public
< 	 * @see gzdecode::$SI1
< 	 * @see gzdecode::$SI2
< 	 * @var string
< 	 */
< 	var $extra_field;
< 
< 	/**
< 	 * Original filename
< 	 *
< 	 * @access public
< 	 * @var string
< 	 */
< 	var $filename;
< 
< 	/**
< 	 * Human readable comment
< 	 *
< 	 * @access public
< 	 * @var string
< 	 */
< 	var $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 >= $this->min_compressed_size)
< 		{
< 			// Check ID1, ID2, and CM
< 			if (substr($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 reserved
< 			if ($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 endianness
< 			if (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[$this->position++]);
< 
< 			// Parse the FEXTRA
< 			if ($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 use
< 				if ($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 += $len;
< 				}
< 				else
< 				{
< 					return false;
< 				}
< 			}
< 
< 			// Parse the FNAME
< 			if ($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 += $len + 1;
< 				}
< 				else
< 				{
< 					return false;
< 				}
< 			}
< 
< 			// Parse the FCOMMENT
< 			if ($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;
< 				}
< 			}



> class_exists('SimplePie\Gzdecode');




< 			// Parse the FHCRC
< 			if ($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)));



> // @trigger_error(sprintf('Using the "SimplePie_gzdecode" class is deprecated since SimplePie 1.7.0, use "SimplePie\Gzdecode" instead.'), \E_USER_DEPRECATED);




< 					// Check the CRC matches
< 					if ((crc32(substr($this->compressed_data, 0, $this->position)) & 0xFFFF) === $crc)
< 					{
< 						$this->position += 2;
< 					}
< 					else



> if (\false) {
>     /** @deprecated since SimplePie 1.7.0, use "SimplePie\Gzdecode" instead */
>     class SimplePie_gzdecode extends Gzdecode


					{

< 						return false;
< 					}
< 				}
< 				else
< 				{
< 					return false;
< 				}
< 			}
< 
< 			// Decompress the actual data
< 			if (($this->data = gzinflate(substr($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 string
< 			return true;
< 		}
< 
< 		return false;


	}
}