%PDF- %PDF-
Direktori : /home/lightco1/upgrade.lightco.com.au/libraries/fof30/Utils/ |
Current File : /home/lightco1/upgrade.lightco.com.au/libraries/fof30/Utils/Buffer.php |
<?php /** * @package FOF * @copyright 2010-2017 Nicholas K. Dionysopoulos / Akeeba Ltd * @license GNU GPL version 2 or later */ namespace FOF30\Utils; defined('_JEXEC') or die; /** * Registers a fof:// stream wrapper */ class Buffer { /** * Stream position * * @var integer */ public $position = 0; /** * Buffer name * * @var string */ public $name = null; /** * Buffer hash * * @var array */ public static $buffers = array(); public static $canRegisterWrapper = null; /** * Should I register the fof:// stream wrapper * * @return bool True if the stream wrapper can be registered */ public static function canRegisterWrapper() { if (is_null(static::$canRegisterWrapper)) { static::$canRegisterWrapper = false; // Check for Suhosin $hasSuhosin = false; 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) { if (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($path, $mode, $options, &$opened_path) { $url = parse_url($path); $this->name = $url['host']; $this->position = 0; if (!isset(static::$buffers[ $this->name ])) { static::$buffers[ $this->name ] = null; } return true; } public function unlink($path) { $url = parse_url($path); $name = $url['host']; if (isset(static::$buffers[ $name ])) { unset (static::$buffers[ $name ]); } } public function stream_stat() { return array( 'dev' => 0, 'ino' => 0, 'mode' => 0644, 'nlink' => 0, 'uid' => 0, 'gid' => 0, 'rdev' => 0, 'size' => strlen(static::$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 $count. Null if * the stream is empty. * * @see streamWrapper::stream_read * @since 11.1 */ public function stream_read($count) { $ret = substr(static::$buffers[ $this->name ], $this->position, $count); $this->position += strlen($ret); return $ret; } /** * Write stream * * @param string $data The data to write to the stream. * * @return integer * * @see streamWrapper::stream_write * @since 11.1 */ public function stream_write($data) { $left = substr(static::$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() { 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() { 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 $whence Position the offset is added to * Options are SEEK_SET, SEEK_CUR, and SEEK_END * * @return boolean True if updated * * @see streamWrapper::stream_seek * @since 11.1 */ public function stream_seek($offset, $whence) { switch ($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', 'FOF30\\Utils\\Buffer'); }