first commit
This commit is contained in:
Manish
366
wp-includes/SimplePie/gzdecode.php
Normal file
366
wp-includes/SimplePie/gzdecode.php
Normal file
@ -0,0 +1,366 @@
|
||||
<?php
|
||||
/**
|
||||
* 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, 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
|
||||
*/
|
||||
|
||||
|
||||
/**
|
||||
* 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 += $len + 1;
|
||||
}
|
||||
else
|
||||
{
|
||||
return false;
|
||||
}
|
||||
}
|
||||
|
||||
// Parse the FHCRC
|
||||
if ($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, $this->position, 2)));
|
||||
|
||||
// Check the CRC matches
|
||||
if ((crc32(substr($this->compressed_data, 0, $this->position)) & 0xFFFF) === $crc)
|
||||
{
|
||||
$this->position += 2;
|
||||
}
|
||||
else
|
||||
{
|
||||
return false;
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
return false;
|
||||
}
|
||||
}
|
||||
|
||||
// Decompress the actual data
|
||||
if (($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;
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user