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<?php
/**
* Copyright 2007-2017 Horde LLC (http://www.horde.org/)
*
* See the enclosed file LICENSE for license information (BSD). If you
* did not receive this file, see http://www.horde.org/licenses/bsd.
*
* @category Horde
* @copyright 2007-2017 Horde LLC
* @license http://www.horde.org/licenses/bsd BSD
* @package Stream_Wrapper
*/
/**
* A stream wrapper that will treat a native PHP string as a stream.
*
* @author Chuck Hagenbuch <chuck@horde.org>
* @author Michael Slusarz <slusarz@horde.org>
* @category Horde
* @copyright 2007-2017 Horde LLC
* @license http://www.horde.org/licenses/bsd BSD
* @package Stream_Wrapper
*/
class Horde_Stream_Wrapper_String
{
/**/
const WRAPPER_NAME = 'horde-stream-wrapper-string';
/**
* The current context.
*
* @var resource
*/
public $context;
/**
* String position.
*
* @var integer
*/
protected $_pos;
/**
* The string.
*
* @var string
*/
protected $_string;
/**
* Unique ID tracker for the streams.
*
* @var integer
*/
private static $_id = 0;
/**
* Create a stream from a PHP string.
*
* @since 2.1.0
*
* @param string &$string A PHP string variable.
*
* @return resource A PHP stream pointing to the variable.
*/
public static function getStream(&$string)
{
if (!self::$_id) {
stream_wrapper_register(self::WRAPPER_NAME, __CLASS__);
}
/* Needed to keep reference. */
$ob = new stdClass;
$ob->string = &$string;
return fopen(
self::WRAPPER_NAME . '://' . ++self::$_id,
'wb',
false,
stream_context_create(array(
self::WRAPPER_NAME => array(
'string' => $ob
)
))
);
}
/**
* @see streamWrapper::stream_open()
*/
public function stream_open($path, $mode, $options, &$opened_path)
{
$opts = stream_context_get_options($this->context);
if (isset($opts[self::WRAPPER_NAME]['string'])) {
$this->_string =& $opts[self::WRAPPER_NAME]['string']->string;
} elseif (isset($opts['horde-string']['string'])) {
// @deprecated
$this->_string =& $opts['horde-string']['string']->getString();
} else {
throw new Exception('Use ' . __CLASS__ . '::getStream() to initialize the stream.');
}
if (is_null($this->_string)) {
return false;
}
$this->_pos = 0;
return true;
}
/**
* @see streamWrapper::stream_close()
*/
public function stream_close()
{
$this->_string = '';
$this->_pos = 0;
}
/**
* @see streamWrapper::stream_read()
*/
public function stream_read($count)
{
$curr = $this->_pos;
$this->_pos += $count;
return substr($this->_string, $curr, $count);
}
/**
* @see streamWrapper::stream_write()
*/
public function stream_write($data)
{
$len = strlen($data);
$this->_string = substr_replace($this->_string, $data, $this->_pos, $len);
$this->_pos += $len;
return $len;
}
/**
* @see streamWrapper::stream_tell()
*/
public function stream_tell()
{
return $this->_pos;
}
/**
* @see streamWrapper::stream_eof()
*/
public function stream_eof()
{
return ($this->_pos > strlen($this->_string));
}
/**
* @see streamWrapper::stream_stat()
*/
public function stream_stat()
{
return array(
'dev' => 0,
'ino' => 0,
'mode' => 0,
'nlink' => 0,
'uid' => 0,
'gid' => 0,
'rdev' => 0,
'size' => strlen($this->_string),
'atime' => 0,
'mtime' => 0,
'ctime' => 0,
'blksize' => 0,
'blocks' => 0
);
}
/**
* @see streamWrapper::stream_seek()
*/
public function stream_seek($offset, $whence)
{
switch ($whence) {
case SEEK_SET:
$pos = $offset;
break;
case SEEK_CUR:
$pos = $this->_pos + $offset;
break;
case SEEK_END:
$pos = strlen($this->_string) + $offset;
break;
}
if (($pos < 0) || ($pos > strlen($this->_string))) {
return false;
}
$this->_pos = $pos;
return true;
}
}