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libraries/joomla/filesystem/streams/string.php
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298
libraries/joomla/filesystem/streams/string.php
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<?php
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/**
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* @package Joomla.Platform
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* @subpackage FileSystem
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*
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* @copyright Copyright (C) 2005 - 2013 Open Source Matters, Inc. All rights reserved.
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* @license GNU General Public License version 2 or later; see LICENSE
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*/
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defined('JPATH_PLATFORM') or die;
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jimport('joomla.filesystem.support.stringcontroller');
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/**
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* String Stream Wrapper
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*
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* This class allows you to use a PHP string in the same way that
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* you would normally use a regular stream wrapper
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*
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* @package Joomla.Platform
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* @subpackage FileSystem
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* @since 11.1
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*/
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class JStreamString
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{
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/**
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* The current string
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*
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* @var string
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* @since 12.1
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*/
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protected $currentString;
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/**
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*
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* The path
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*
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* @var string
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* @since 12.1
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*/
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protected $path;
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/**
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*
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* The mode
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*
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* @var string
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* @since 12.1
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*/
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protected $mode;
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/**
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*
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* Enter description here ...
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* @var string
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*
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* @since 12.1
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*/
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protected $options;
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/**
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*
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* Enter description here ...
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* @var string
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*
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* @since 12.1
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*/
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protected $openedPath;
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/**
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* Current position
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*
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* @var integer
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* @since 12.1
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*/
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protected $pos;
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/**
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* Length of the string
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*
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* @var string
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*
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* @since 12.1
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*/
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protected $len;
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/**
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* Statistics for a file
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*
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* @var array
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* @since 12.1
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*
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* @see http://us.php.net/manual/en/function.stat.php
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*/
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protected $stat;
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/**
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* Method to open a file or URL.
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*
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* @param string $path The stream path.
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* @param string $mode Not used.
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* @param integer $options Not used.
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* @param string &$opened_path Not used.
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*
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* @return boolean
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*
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* @since 11.1
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*/
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public function stream_open($path, $mode, $options, &$opened_path)
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{
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$this->currentString = &JStringController::getRef(str_replace('string://', '', $path));
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if ($this->currentString)
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{
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$this->len = strlen($this->currentString);
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$this->pos = 0;
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$this->stat = $this->url_stat($path, 0);
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return true;
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}
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else
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{
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return false;
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}
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}
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/**
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* Method to retrieve information from a file resource
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*
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* @return array
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*
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* @see http://www.php.net/manual/en/streamwrapper.stream-stat.php
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* @since 11.1
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*/
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public function stream_stat()
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{
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return $this->stat;
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}
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/**
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* Method to retrieve information about a file.
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*
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* @param string $path File path or URL to stat
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* @param integer $flags Additional flags set by the streams API
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*
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* @return array
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*
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* @see http://php.net/manual/en/streamwrapper.url-stat.php
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* @since 11.1
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*/
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public function url_stat($path, $flags = 0)
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{
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$now = time();
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$string = &JStringController::getRef(str_replace('string://', '', $path));
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$stat = array(
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'dev' => 0,
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'ino' => 0,
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'mode' => 0,
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'nlink' => 1,
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'uid' => 0,
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'gid' => 0,
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'rdev' => 0,
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'size' => strlen($string),
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'atime' => $now,
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'mtime' => $now,
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'ctime' => $now,
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'blksize' => '512',
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'blocks' => ceil(strlen($string) / 512));
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return $stat;
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}
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/**
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* Method to read a given number of bytes starting at the current position
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* and moving to the end of the string defined by the current position plus the
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* given number.
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*
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* @param integer $count Bytes of data from the current position should be returned.
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*
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* @return void
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*
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* @since 11.1
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*
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* @see http://www.php.net/manual/en/streamwrapper.stream-read.php
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*/
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public function stream_read($count)
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{
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$result = substr($this->currentString, $this->pos, $count);
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$this->pos += $count;
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return $result;
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}
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/**
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* Stream write, always returning false.
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*
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* @param string $data The data to write.
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*
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* @return boolean
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*
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* @since 11.1
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* @note Updating the string is not supported.
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*/
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public function stream_write($data)
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{
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// We don't support updating the string.
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return false;
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}
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/**
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* Method to get the current position
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*
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* @return integer The position
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*
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* @since 11.1
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*/
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public function stream_tell()
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{
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return $this->pos;
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}
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/**
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* End of field check
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*
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* @return boolean True if at end of field.
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*
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* @since 11.1
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*/
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public function stream_eof()
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{
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if ($this->pos > $this->len)
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{
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return true;
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}
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return false;
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}
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/**
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* Stream offset
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*
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* @param integer $offset The starting offset.
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* @param integer $whence SEEK_SET, SEEK_CUR, SEEK_END
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*
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* @return boolean True on success.
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*
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* @since 11.1
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*/
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public function stream_seek($offset, $whence)
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{
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// $whence: SEEK_SET, SEEK_CUR, SEEK_END
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if ($offset > $this->len)
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{
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// We can't seek beyond our len.
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return false;
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}
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switch ($whence)
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{
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case SEEK_SET:
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$this->pos = $offset;
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break;
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case SEEK_CUR:
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if (($this->pos + $offset) < $this->len)
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{
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$this->pos += $offset;
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}
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else
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{
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return false;
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}
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break;
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case SEEK_END:
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$this->pos = $this->len - $offset;
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break;
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}
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return true;
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}
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/**
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* Stream flush, always returns true.
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*
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* @return boolean
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*
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* @since 11.1
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* @note Data storage is not supported
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*/
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public function stream_flush()
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{
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// We don't store data.
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return true;
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}
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}
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stream_wrapper_register('string', 'JStreamString') or die('JStreamString Wrapper Registration Failed');
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