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<?php /** * Joomla! Content Management System * * @copyright Copyright (C) 2005 - 2020 Open Source Matters, Inc. All rights reserved. * @license GNU General Public License version 2 or later; see LICENSE.txt */ namespace Joomla\CMS\Utility; defined('JPATH_PLATFORM') or die; // Workaround for B/C. Will be removed with 4.0 BufferStreamHandler::stream_register(); /** * Generic Buffer stream handler * * This class provides a generic buffer stream. It can be used to store/retrieve/manipulate * string buffers with the standard PHP filesystem I/O methods. * * @since 1.7.0 */ class BufferStreamHandler { /** * Stream position * * @var integer * @since 1.7.0 */ public $position = 0; /** * Buffer name * * @var string * @since 1.7.0 */ public $name = null; /** * Buffer hash * * @var array * @since 3.0.0 */ public $buffers = array(); /** * Status of registering the wrapper * * @var boolean * @since 3.8.2 */ static private $registered = false; /** * Function to register the stream wrapper * * @return void * * @since 3.8.2 */ public static function stream_register() { if (!self::$registered) { stream_wrapper_register('buffer', '\\Joomla\\CMS\\Utility\\BufferStreamHandler'); self::$registered = true; } return; } /** * 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 $options Flags used by the API, may be STREAM_USE_PATH and * STREAM_REPORT_ERRORS * @param string &$openedPath Full path of the resource. Used with STREAM_USE_PATH option * * @return boolean * * @since 1.7.0 * @see streamWrapper::stream_open */ public function stream_open($path, $mode, $options, &$openedPath) { $url = parse_url($path); $this->name = $url['host']; $this->buffers[$this->name] = null; $this->position = 0; return true; } /** * 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 $count. Null if * the stream is empty. * * @see streamWrapper::stream_read * @since 1.7.0 */ public function stream_read($count) { $ret = substr($this->buffers[$this->name], $this->position, $count); $this->position += strlen($ret); return $ret; } /** * Write stream * * @param string $data The data to write to the stream. * * @return integer * * @see streamWrapper::stream_write * @since 1.7.0 */ public function stream_write($data) { $left = substr($this->buffers[$this->name], 0, $this->position); $right = substr($this->buffers[$this->name], $this->position + strlen($data)); $this->buffers[$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 1.7.0 */ 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 1.7.0 */ public function stream_eof() { return $this->position >= strlen($this->buffers[$this->name]); } /** * The read write position updates in response to $offset and $whence * * @param integer $offset The offset in bytes * @param integer $whence Position the offset is added to * Options are SEEK_SET, SEEK_CUR, and SEEK_END * * @return boolean True if updated * * @see streamWrapper::stream_seek * @since 1.7.0 */ public function stream_seek($offset, $whence) { switch ($whence) { case SEEK_SET : return $this->seek_set($offset); case SEEK_CUR : return $this->seek_cur($offset); case SEEK_END : return $this->seek_end($offset); } return false; } /** * Set the position to the offset * * @param integer $offset The offset in bytes * * @return boolean */ protected function seek_set($offset) { if ($offset < 0 || $offset > strlen($this->buffers[$this->name])) { return false; } $this->position = $offset; return true; } /** * Adds the offset to current position * * @param integer $offset The offset in bytes * * @return boolean */ protected function seek_cur($offset) { if ($offset < 0) { return false; } $this->position += $offset; return true; } /** * Sets the position to the end of the current buffer + offset * * @param integer $offset The offset in bytes * * @return boolean */ protected function seek_end($offset) { $offset += strlen($this->buffers[$this->name]); if ($offset < 0) { return false; } $this->position = $offset; return true; } }
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