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<?php
/**
* String Stream Wrapper.
*
* @category phplist
*
* @author Duncan Cameron
* @copyright 2012-2018 Duncan Cameron
* @license http://www.gnu.org/licenses/gpl.html GNU General Public License, Version 3
*/
namespace phpList\plugin\Common;
/**
* This class allows a PHP variable to be used as a read/write stream.
*
* Based on code originally developed by Sam Moffatt <sam.moffatt@toowoombarc.qld.gov.au>
* See http://code.google.com/p/phpstringstream/
*/
class StringStream
{
const MODE_READ = 1;
const MODE_WRITE = 2;
public $context;
private $_currentstring;
private $_mode;
private $_pos;
private static $references = array();
public static function stringId(&$variable)
{
$id = uniqid();
self::$references[$id] = &$variable;
return $id;
}
public static function fopen(&$variable, $mode = 'r')
{
$id = self::stringId($variable);
$fh = fopen("string://$id", $mode);
return $fh;
}
public function stream_open($path, $mode, $options, &$opened_path)
{
$id = parse_url($path, PHP_URL_HOST);
if (!isset(self::$references[$id])) {
return false;
}
$this->_currentstring = &self::$references[$id];
if (strpos($mode, 'r') !== false) {
$this->_mode = self::MODE_READ;
} elseif (strpos($mode, 'w') !== false) {
$this->_currentstring = '';
$this->_mode = self::MODE_WRITE;
} else {
return false;
}
$this->_pos = 0;
return true;
}
public function stream_stat()
{
return false;
}
public function stream_read($count)
{
if ($this->_mode != self::MODE_READ) {
return false;
}
$result = substr($this->_currentstring, $this->_pos, $count);
$this->_pos += strlen($result);
return $result;
}
public function stream_write($data)
{
if ($this->_mode != self::MODE_WRITE) {
return false;
}
$count = strlen($data);
$this->_currentstring = substr_replace($this->_currentstring, $data, $this->_pos, 0);
$this->_pos += $count;
return $count;
}
public function stream_tell()
{
return $this->_pos;
}
public function stream_eof()
{
return $this->_pos >= strlen($this->_currentstring);
}
/* public function stream_seek($offset, $whence)
{
echo "\n$offset $whence $this->_pos $this->_len ";
switch ($whence) {
case SEEK_SET:
if (!($offset >= 0 && $offset < $this->_len))
return false;
$this->_pos = $offset;
break;
case SEEK_CUR:
if (!($offset >= 0 && $this->_pos + $offset < $this->_len))
return false;
$this->_pos += $offset;
break;
case SEEK_END:
if (!($offset <= 0 && $offset + $this->_len >= 0))
return false;
$this->_pos = $this->_len + $offset;
break;
}
return true;
} */
}
stream_wrapper_register('string', StringStream::class) or exit('Failed to register string stream');