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<?php
/**
* @package Joomla.Platform
* @subpackage Utilities
*
* @copyright Copyright (C) 2005 - 2014 Open Source Matters, Inc. All rights reserved.
* @license GNU General Public License version 2 or later; see LICENSE
*/
defined('JPATH_PLATFORM') or die;
/**
* 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.
*
* @package Joomla.Platform
* @subpackage Utilities
* @since 11.1
*/
class JBuffer
{
/**
* Stream position
*
* @var integer
* @since 11.1
*/
public $position = 0;
/**
* Buffer name
*
* @var string
* @since 11.1
*/
public $name = null;
/**
* Buffer hash
*
* @var array
* @since 11.1
*/
public $_buffers = array();
/**
* 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 STREAN_USE_PATH option
*
* @return boolean
*
* @since 11.1
* @see streamWrapper::stream_open
*/
public function stream_open($path, $mode, $options, &$opened_path)
{
$url = parse_url($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 $count. Null if
* the stream is empty.
*
* @see streamWrapper::stream_read
* @since 11.1
*/
public function stream_read($count)
{
$ret = substr($this->_buffers[$this->name], $this->position, $count);
$this->position += strlen($ret);
return $ret;
}
/**
* Write stream
*
* @param string $data The data to write to the stream.
*
* @return integer
*
* @see streamWrapper::stream_write
* @since 11.1
*/
public function stream_write($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 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 $this->position >= strlen($this->_buffers[$this->name]);
}
/**
* The read write position updates in response to $offset and $whence
*
* @param integer $offset The offset in bytes
* @param integer $whence Position the offset is added to
* Options are SEEK_SET, SEEK_CUR, and SEEK_END
*
* @return boolean True if updated
*
* @see streamWrapper::stream_seek
* @since 11.1
*/
public function stream_seek($offset, $whence)
{
switch ($whence)
{
case SEEK_SET:
if ($offset < strlen($this->_buffers[$this->name]) && $offset >= 0)
{
$this->position = $offset;
return true;
}
else
{
return false;
}
break;
case SEEK_CUR:
if ($offset >= 0)
{
$this->position += $offset;
return true;
}
else
{
return false;
}
break;
case SEEK_END:
if (strlen($this->_buffers[$this->name]) + $offset >= 0)
{
$this->position = strlen($this->_buffers[$this->name]) + $offset;
return true;
}
else
{
return false;
}
break;
default:
return false;
}
}
}
// Register the stream
stream_wrapper_register("buffer", "JBuffer");