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File Gzdecode.php

<?php

// SPDX-FileCopyrightText: 2004-2023 Ryan Parman, Sam Sneddon, Ryan McCue
// SPDX-License-Identifier: BSD-3-Clause

declare(strict_types=1);

namespace SimplePie;

/**
 * Decode 'gzip' encoded HTTP data
 *
 * @link http://www.gzip.org/format.txt
 * @link https://www.php.net/manual/en/function.gzdecode.php
 * @deprecated since SimplePie 1.9.0, use `gzdecode` function instead.
 */
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(string $name, $value)
    {
        throw new Exception("Cannot write property $name");
    }

/**
     * Set the compressed string and related properties
     *
     * @param string $data
     */
    public function __construct(string $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 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((array) unpack('S', "\x00\x01")) === 1) {
                $mtime = strrev($mtime);
            }
            $this->MTIME = current((array) 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
                $len = current((array) unpack('v', substr($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;
                }
            }

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

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

// Decompress the actual data
            if (($data = gzinflate(substr($this->compressed_data, $this->position, -8))) === false) {
                return false;
            }

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

// Check CRC of data
            $crc = current((array) unpack('V', substr($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
            $isize = current((array) unpack('V', substr($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;
    }
}

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

Name	Type	Size	Permission	Last Modified	Actions
.	DIR	-	drwxr-xr-x	2026-06-18 12:25:41
..	DIR	-	drwxr-xr-x	2026-06-18 12:25:41
Cache	DIR	-	drwxr-xr-x	2026-06-18 12:25:41
Content	DIR	-	drwxr-xr-x	2026-06-18 12:25:41
HTTP	DIR	-	drwxr-xr-x	2026-06-18 12:25:41
Net	DIR	-	drwxr-xr-x	2026-06-18 12:25:41
Parse	DIR	-	drwxr-xr-x	2026-06-18 12:25:41
XML	DIR	-	drwxr-xr-x	2026-06-18 12:25:41
Author.php	text/x-php	1.86 KB	-rw-r--r--	2026-06-18 12:25:41
Cache.php	text/x-php	3.17 KB	-rw-r--r--	2026-06-18 12:25:41
Caption.php	text/x-php	3.03 KB	-rw-r--r--	2026-06-18 12:25:41
Category.php	text/x-php	2.41 KB	-rw-r--r--	2026-06-18 12:25:41
Copyright.php	text/x-php	1.67 KB	-rw-r--r--	2026-06-18 12:25:41
Credit.php	text/x-php	2.09 KB	-rw-r--r--	2026-06-18 12:25:41
Enclosure.php	text/x-php	31.39 KB	-rw-r--r--	2026-06-18 12:25:41
Exception.php	text/x-php	355 B	-rw-r--r--	2026-06-18 12:25:41
File.php	text/x-php	18.94 KB	-rw-r--r--	2026-06-18 12:25:41
Gzdecode.php	text/x-php	8.31 KB	-rw-r--r--	2026-06-18 12:25:41
IRI.php	text/x-php	33.99 KB	-rw-r--r--	2026-06-18 12:25:41
Item.php	text/x-php	128.54 KB	-rw-r--r--	2026-06-18 12:25:41
Locator.php	text/x-php	16.31 KB	-rw-r--r--	2026-06-18 12:25:41
Misc.php	text/x-php	68.16 KB	-rw-r--r--	2026-06-18 12:25:41
Parser.php	text/x-php	34.05 KB	-rw-r--r--	2026-06-18 12:25:41
Rating.php	text/x-php	1.75 KB	-rw-r--r--	2026-06-18 12:25:41
Registry.php	text/x-php	7.71 KB	-rw-r--r--	2026-06-18 12:25:41
RegistryAware.php	text/x-php	447 B	-rw-r--r--	2026-06-18 12:25:41
Restriction.php	text/x-php	2.31 KB	-rw-r--r--	2026-06-18 12:25:41
Sanitize.php	text/x-php	29.64 KB	-rw-r--r--	2026-06-18 12:25:41
SimplePie.php	text/x-php	125.05 KB	-rw-r--r--	2026-06-18 12:25:41
Source.php	text/x-php	23.18 KB	-rw-r--r--	2026-06-18 12:25:41

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