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<?php
/**
* @package FOF
* @copyright Copyright (c)2010-2022 Nicholas K. Dionysopoulos / Akeeba Ltd
* @license GNU General Public License version 3, or later
*/
namespace FOF40\Utils;
defined('_JEXEC') || die;
/**
* Registers a fof:// stream wrapper
*/
class Buffer
{
/**
* Buffer hash
*
* @var array
*/
public static $buffers = [];
public static $canRegisterWrapper;
/**
* Stream position
*
* @var integer
*/
public $position = 0;
/**
* Buffer name
*
* @var string
*/
public $name;
/**
* Should I register the fof:// stream wrapper
*
* @return bool True if the stream wrapper can be registered
*/
public static function canRegisterWrapper(): bool
{
if (is_null(static::$canRegisterWrapper))
{
static::$canRegisterWrapper = false;
// Maybe the host has disabled registering stream wrappers altogether?
if (!function_exists('stream_wrapper_register'))
{
return false;
}
// Check for Suhosin
if (function_exists('extension_loaded'))
{
$hasSuhosin = extension_loaded('suhosin');
}
else
{
$hasSuhosin = -1; // Can't detect
}
if ($hasSuhosin !== true)
{
$hasSuhosin = defined('SUHOSIN_PATCH') ? true : -1;
}
if (($hasSuhosin === -1) && function_exists('ini_get'))
{
$hasSuhosin = false;
$maxIdLength = ini_get('suhosin.session.max_id_length');
if ($maxIdLength !== false)
{
$hasSuhosin = ini_get('suhosin.session.max_id_length') !== '';
}
}
// If we can't detect whether Suhosin is installed we won't proceed to prevent a White Screen of Death
if ($hasSuhosin === -1)
{
return false;
}
// If Suhosin is installed but ini_get is not available we won't proceed to prevent a WSoD
if ($hasSuhosin && !function_exists('ini_get'))
{
return false;
}
// If Suhosin is installed check if fof:// is whitelisted
if ($hasSuhosin)
{
$whiteList = ini_get('suhosin.executor.include.whitelist');
// Nothing in the whitelist? I can't go on, sorry.
if (empty($whiteList))
{
return false;
}
$whiteList = explode(',', $whiteList);
$whiteList = array_map(function ($x) {
return trim($x);
}, $whiteList);
if (!in_array('fof://', $whiteList))
{
return false;
}
}
static::$canRegisterWrapper = true;
}
return static::$canRegisterWrapper;
}
/**
* Function to open file or url
*
* @param string $path The URL that was passed
* @param string $mode Mode used to open the file @see fopen
* @param integer $options Flags used by the API, may be STREAM_USE_PATH and
* STREAM_REPORT_ERRORS
* @param string &$opened_path Full path of the resource. Used with STREAM_USE_PATH option
*
* @return boolean
*
* @see streamWrapper::stream_open
*/
public function stream_open(string $path, string $mode, ?int $options, ?string &$opened_path): bool
{
$url = parse_url($path);
$this->name = $url['host'] . $url['path'];
$this->position = 0;
if (!isset(static::$buffers[$this->name]))
{
static::$buffers[$this->name] = null;
}
return true;
}
public function unlink(string $path): void
{
$url = parse_url($path);
$name = $url['host'];
if (isset(static::$buffers[$name]))
{
unset (static::$buffers[$name]);
}
}
public function stream_stat(): array
{
return [
'dev' => 0,
'ino' => 0,
'mode' => 0644,
'nlink' => 0,
'uid' => 0,
'gid' => 0,
'rdev' => 0,
'size' => strlen(static::$buffers[$this->name]),
'atime' => 0,
'mtime' => 0,
'ctime' => 0,
'blksize' => -1,
'blocks' => -1,
];
}
/**
* Read stream
*
* @param integer $count How many bytes of data from the current position should be returned.
*
* @return mixed The data from the stream up to the specified number of bytes (all data if
* the total number of bytes in the stream is less than $count. Null if
* the stream is empty.
*
* @see streamWrapper::stream_read
* @since 11.1
*/
public function stream_read(int $count): ?string
{
$ret = substr(static::$buffers[$this->name], $this->position, $count);
$this->position += strlen($ret);
return $ret;
}
/**
* Write stream
*
* @param string $data The data to write to the stream.
*
* @return integer
*
* @see streamWrapper::stream_write
* @since 11.1
*/
public function stream_write(string $data): int
{
$left = substr(static::$buffers[$this->name], 0, $this->position);
$right = substr(static::$buffers[$this->name], $this->position + strlen($data));
static::$buffers[$this->name] = $left . $data . $right;
$this->position += strlen($data);
return strlen($data);
}
/**
* Function to get the current position of the stream
*
* @return integer
*
* @see streamWrapper::stream_tell
* @since 11.1
*/
public function stream_tell(): int
{
return $this->position;
}
/**
* Function to test for end of file pointer
*
* @return boolean True if the pointer is at the end of the stream
*
* @see streamWrapper::stream_eof
* @since 11.1
*/
public function stream_eof(): bool
{
return $this->position >= strlen(static::$buffers[$this->name]);
}
/**
* The read write position updates in response to $offset and $whence
*
* @param integer $offset The offset in bytes
* @param integer $whence Position the offset is added to
* Options are SEEK_SET, SEEK_CUR, and SEEK_END
*
* @return boolean True if updated
*
* @see streamWrapper::stream_seek
* @since 11.1
*/
public function stream_seek(int $offset, int $whence): bool
{
switch ($whence)
{
case SEEK_SET:
if ($offset < strlen(static::$buffers[$this->name]) && $offset >= 0)
{
$this->position = $offset;
return true;
}
else
{
return false;
}
break;
case SEEK_CUR:
if ($offset >= 0)
{
$this->position += $offset;
return true;
}
else
{
return false;
}
break;
case SEEK_END:
if (strlen(static::$buffers[$this->name]) + $offset >= 0)
{
$this->position = strlen(static::$buffers[$this->name]) + $offset;
return true;
}
else
{
return false;
}
break;
default:
return false;
}
}
}
if (Buffer::canRegisterWrapper())
{
stream_wrapper_register('fof', 'FOF40\\Utils\\Buffer');
}