<?php

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// SPDX-FileCopyrightText: 2004-2023 Ryan Parman, Sam Sneddon, Ryan McCue

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// SPDX-License-Identifier: BSD-3-Clause

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declare(strict_types=1);

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namespace SimplePie;

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/**

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* Decode 'gzip' encoded HTTP data

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*

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* @link http://www.gzip.org/format.txt

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* @link https://www.php.net/manual/en/function.gzdecode.php

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* @deprecated since SimplePie 1.9.0, use `gzdecode` function instead.

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*/

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class Gzdecode

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{

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/**

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* Compressed data

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*

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* @access private

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* @var string

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* @see gzdecode::$data

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*/

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public $compressed_data;

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/**

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* Size of compressed data

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*

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* @access private

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* @var int

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*/

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public $compressed_size;

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/**

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* Minimum size of a valid gzip string

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*

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* @access private

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* @var int

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*/

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public $min_compressed_size = 18;

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/**

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* Current position of pointer

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*

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* @access private

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* @var int

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*/

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public $position = 0;

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/**

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* Flags (FLG)

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*

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* @access private

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* @var int

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*/

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public $flags;

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/**

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* Uncompressed data

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*

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* @access public

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* @see gzdecode::$compressed_data

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* @var string

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*/

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public $data;

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/**

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* Modified time

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*

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* @access public

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* @var int

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*/

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public $MTIME;

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/**

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* Extra Flags

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*

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* @access public

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* @var int

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*/

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public $XFL;

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/**

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* Operating System

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*

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* @access public

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* @var int

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*/

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public $OS;

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/**

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* Subfield ID 1

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*

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* @access public

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* @see gzdecode::$extra_field

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* @see gzdecode::$SI2

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* @var string

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*/

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public $SI1;

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/**

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* Subfield ID 2

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*

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* @access public

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* @see gzdecode::$extra_field

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* @see gzdecode::$SI1

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* @var string

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*/

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public $SI2;

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/**

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* Extra field content

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*

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* @access public

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* @see gzdecode::$SI1

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* @see gzdecode::$SI2

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* @var string

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*/

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public $extra_field;

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/**

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* Original filename

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*

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* @access public

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* @var string

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*/

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public $filename;

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/**

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* Human readable comment

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*

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* @access public

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* @var string

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*/

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public $comment;

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/**

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* Don't allow anything to be set

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*

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* @param string $name

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* @param mixed $value

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*/

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public function __set(string $name, $value)

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{

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throw new Exception("Cannot write property $name");

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}

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/**

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* Set the compressed string and related properties

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*

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* @param string $data

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*/

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public function __construct(string $data)

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{

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$this->compressed_data = $data;

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$this->compressed_size = strlen($data);

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}

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/**

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* Decode the GZIP stream

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*

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* @return bool Successfulness

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*/

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public function parse()

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{

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if ($this->compressed_size >= $this->min_compressed_size) {

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$len = 0;

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// Check ID1, ID2, and CM

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if (substr($this->compressed_data, 0, 3) !== "\x1F\x8B\x08") {

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return false;

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}

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// Get the FLG (FLaGs)

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$this->flags = ord($this->compressed_data[3]);

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// FLG bits above (1 << 4) are reserved

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if ($this->flags > 0x1F) {

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return false;

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}

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// Advance the pointer after the above

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$this->position += 4;

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// MTIME

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$mtime = substr($this->compressed_data, $this->position, 4);

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// Reverse the string if we're on a big-endian arch because l is the only signed long and is machine endianness

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if (current((array) unpack('S', "\x00\x01")) === 1) {

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$mtime = strrev($mtime);

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}

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$this->MTIME = current((array) unpack('l', $mtime));

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$this->position += 4;

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// Get the XFL (eXtra FLags)

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$this->XFL = ord($this->compressed_data[$this->position++]);

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// Get the OS (Operating System)

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$this->OS = ord($this->compressed_data[$this->position++]);

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// Parse the FEXTRA

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if ($this->flags & 4) {

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// Read subfield IDs

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$this->SI1 = $this->compressed_data[$this->position++];

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$this->SI2 = $this->compressed_data[$this->position++];

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// SI2 set to zero is reserved for future use

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if ($this->SI2 === "\x00") {

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return false;

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}

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// Get the length of the extra field

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$len = current((array) unpack('v', substr($this->compressed_data, $this->position, 2)));

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$this->position += 2;

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// Check the length of the string is still valid

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$this->min_compressed_size += $len + 4;

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if ($this->compressed_size >= $this->min_compressed_size) {

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// Set the extra field to the given data

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$this->extra_field = substr($this->compressed_data, $this->position, $len);

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$this->position += $len;

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} else {

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return false;

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}

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}

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// Parse the FNAME

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if ($this->flags & 8) {

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// Get the length of the filename

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$len = strcspn($this->compressed_data, "\x00", $this->position);

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// Check the length of the string is still valid

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$this->min_compressed_size += $len + 1;

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if ($this->compressed_size >= $this->min_compressed_size) {

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// Set the original filename to the given string

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$this->filename = substr($this->compressed_data, $this->position, $len);

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$this->position += $len + 1;

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} else {

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return false;

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}

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}

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// Parse the FCOMMENT

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if ($this->flags & 16) {

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// Get the length of the comment

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$len = strcspn($this->compressed_data, "\x00", $this->position);

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// Check the length of the string is still valid

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$this->min_compressed_size += $len + 1;

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if ($this->compressed_size >= $this->min_compressed_size) {

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// Set the original comment to the given string

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$this->comment = substr($this->compressed_data, $this->position, $len);

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$this->position += $len + 1;

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} else {

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return false;

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}

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}

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// Parse the FHCRC

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if ($this->flags & 2) {

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// Check the length of the string is still valid

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$this->min_compressed_size += $len + 2;

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if ($this->compressed_size >= $this->min_compressed_size) {

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// Read the CRC

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$crc = current((array) unpack('v', substr($this->compressed_data, $this->position, 2)));

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// Check the CRC matches

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if ((crc32(substr($this->compressed_data, 0, $this->position)) & 0xFFFF) === $crc) {

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$this->position += 2;

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} else {

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return false;

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}

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} else {

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return false;

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}

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}

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// Decompress the actual data

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if (($data = gzinflate(substr($this->compressed_data, $this->position, -8))) === false) {

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return false;

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}

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$this->data = $data;

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$this->position = $this->compressed_size - 8;

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// Check CRC of data

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$crc = current((array) unpack('V', substr($this->compressed_data, $this->position, 4)));

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$this->position += 4;

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/*if (extension_loaded('hash') && sprintf('%u', current(unpack('V', hash('crc32b', $this->data)))) !== sprintf('%u', $crc))

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{

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return false;

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}*/

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// Check ISIZE of data

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$isize = current((array) unpack('V', substr($this->compressed_data, $this->position, 4)));

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$this->position += 4;

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if (sprintf('%u', strlen($this->data) & 0xFFFFFFFF) !== sprintf('%u', $isize)) {

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return false;

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}

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// Wow, against all odds, we've actually got a valid gzip string

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return true;

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}

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return false;

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}

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}

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class_alias('SimplePie\Gzdecode', 'SimplePie_gzdecode');

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