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<?php
/**
* Part of the Joomla Framework Filesystem Package
*
* @copyright Copyright (C) 2005 - 2021 Open Source Matters, Inc. All rights reserved.
* @license GNU General Public License version 2 or later; see LICENSE
*/
namespace Joomla\Filesystem\Stream;
use Joomla\Filesystem\Support\StringController;
/**
* String Stream Wrapper
*
* This class allows you to use a PHP string in the same way that you would normally use a regular stream wrapper
*
* @since 1.3.0
*/
class StringWrapper
{
/**
* The current string
*
* @var string
* @since 1.3.0
*/
protected $currentString;
/**
* The path
*
* @var string
* @since 1.3.0
*/
protected $path;
/**
* The mode
*
* @var string
* @since 1.3.0
*/
protected $mode;
/**
* Enter description here ...
*
* @var string
* @since 1.3.0
*/
protected $options;
/**
* Enter description here ...
*
* @var string
* @since 1.3.0
*/
protected $openedPath;
/**
* Current position
*
* @var integer
* @since 1.3.0
*/
protected $pos;
/**
* Length of the string
*
* @var string
* @since 1.3.0
*/
protected $len;
/**
* Statistics for a file
*
* @var array
* @since 1.3.0
* @link https://www.php.net/manual/en/function.stat.php
*/
protected $stat;
/**
* Method to open a file or URL.
*
* @param string $path The stream path.
* @param string $mode Not used.
* @param integer $options Not used.
* @param string $openedPath Not used.
*
* @return boolean
*
* @since 1.3.0
*/
public function stream_open($path, $mode, $options, &$openedPath)
{
$refPath = StringController::getRef(str_replace('string://', '', $path));
$this->currentString = &$refPath;
if ($this->currentString) {
$this->len = \strlen($this->currentString);
$this->pos = 0;
$this->stat = $this->url_stat($path, 0);
return true;
}
return false;
}
/**
* Method to retrieve information from a file resource
*
* @return array
*
* @link https://www.php.net/manual/en/streamwrapper.stream-stat.php
* @since 1.3.0
*/
public function stream_stat()
{
return $this->stat;
}
/**
* Method to retrieve information about a file.
*
* @param string $path File path or URL to stat
* @param integer $flags Additional flags set by the streams API
*
* @return array
*
* @link https://www.php.net/manual/en/streamwrapper.url-stat.php
* @since 1.3.0
*/
public function url_stat($path, $flags = 0)
{
$now = time();
$refPath = StringController::getRef(str_replace('string://', '', $path));
$string = &$refPath;
$stat = [
'dev' => 0,
'ino' => 0,
'mode' => 0,
'nlink' => 1,
'uid' => 0,
'gid' => 0,
'rdev' => 0,
'size' => \strlen($string),
'atime' => $now,
'mtime' => $now,
'ctime' => $now,
'blksize' => '512',
'blocks' => ceil(\strlen($string) / 512),
];
return $stat;
}
/**
* Method to read a given number of bytes starting at the current position
* and moving to the end of the string defined by the current position plus the
* given number.
*
* @param integer $count Bytes of data from the current position should be returned.
*
* @return string
*
* @link https://www.php.net/manual/en/streamwrapper.stream-read.php
* @since 1.3.0
*/
public function stream_read($count)
{
$result = substr($this->currentString, $this->pos ?? 0, $count);
$this->pos += $count;
return $result;
}
/**
* Stream write, always returning false.
*
* @param string $data The data to write.
*
* @return boolean
*
* @since 1.3.0
* @note Updating the string is not supported.
*/
public function stream_write($data)
{
// We don't support updating the string.
return false;
}
/**
* Method to get the current position
*
* @return integer The position
*
* @since 1.3.0
*/
public function stream_tell()
{
return $this->pos;
}
/**
* End of field check
*
* @return boolean True if at end of field.
*
* @since 1.3.0
*/
public function stream_eof()
{
if ($this->pos >= $this->len) {
return true;
}
return false;
}
/**
* Stream offset
*
* @param integer $offset The starting offset.
* @param integer $whence SEEK_SET, SEEK_CUR, SEEK_END
*
* @return boolean True on success.
*
* @since 1.3.0
*/
public function stream_seek($offset, $whence)
{
// $whence: SEEK_SET, SEEK_CUR, SEEK_END
if ($offset > $this->len) {
// We can't seek beyond our len.
return false;
}
switch ($whence) {
case \SEEK_SET:
$this->pos = $offset;
break;
case \SEEK_CUR:
if (($this->pos + $offset) > $this->len) {
return false;
}
$this->pos += $offset;
break;
case \SEEK_END:
$this->pos = $this->len - $offset;
break;
}
return true;
}
/**
* Stream flush, always returns true.
*
* @return boolean
*
* @since 1.3.0
* @note Data storage is not supported
*/
public function stream_flush()
{
// We don't store data.
return true;
}
}
// phpcs:disable PSR1.Files.SideEffects
if (!stream_wrapper_register('string', '\\Joomla\\Filesystem\\Stream\\StringWrapper')) {
die('\\Joomla\\Filesystem\\Stream\\StringWrapper Wrapper Registration Failed');
}
// phpcs:enable PSR1.Files.SideEffects