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   1  <?php
   2  /**
   3   * @version        $Id:buffer.php 6961 2007-03-15 16:06:53Z tcp $
   4   * @package        Joomla.Framework
   5   * @subpackage    Utilities
   6   * @copyright    Copyright (C) 2005 - 2010 Open Source Matters. All rights reserved.
   7   * @license        GNU/GPL, see LICENSE.php
   8   * Joomla! is free software. This version may have been modified pursuant
   9   * to the GNU General Public License, and as distributed it includes or
  10   * is derivative of works licensed under the GNU General Public License or
  11   * other free or open source software licenses.
  12   * See COPYRIGHT.php for copyright notices and details.
  13   */
  14  defined('JPATH_BASE') or die();
  15  /**
  16   * Generic Buffer stream handler
  17   *
  18   * This class provides a generic buffer stream.  It can be used to store/retrieve/manipulate
  19   * string buffers with the standard PHP filesystem I/O methods.
  20   *
  21   * @package     Joomla.Framework
  22   * @subpackage    Utilities
  23   * @since        1.5
  24   */
  25  class JBuffer
  26  {
  27      /**
  28       * Stream position
  29       * @var int
  30       */
  31      var $position = 0;
  32  
  33      /**
  34       * Buffer name
  35       * @var string
  36       */
  37      var $name = null;
  38  
  39      /**
  40       * Buffer hash
  41       * @var array
  42       */
  43      var $_buffers = array ();
  44  
  45  	function stream_open($path, $mode, $options, & $opened_path)
  46      {
  47          $url = parse_url($path);
  48          $this->name = $url["host"];
  49          $this->_buffers[$this->name] = null;
  50          $this->position = 0;
  51  
  52          return true;
  53      }
  54  
  55  	function stream_read($count)
  56      {
  57          $ret = substr($this->_buffers[$this->name], $this->position, $count);
  58          $this->position += strlen($ret);
  59          return $ret;
  60      }
  61  
  62  	function stream_write($data)
  63      {
  64          $left = substr($this->_buffers[$this->name], 0, $this->position);
  65          $right = substr($this->_buffers[$this->name], $this->position + strlen($data));
  66          $this->_buffers[$this->name] = $left . $data . $right;
  67          $this->position += strlen($data);
  68          return strlen($data);
  69      }
  70  
  71  	function stream_tell() {
  72          return $this->position;
  73      }
  74  
  75  	function stream_eof() {
  76          return $this->position >= strlen($this->_buffers[$this->name]);
  77      }
  78  
  79  	function stream_seek($offset, $whence)
  80      {
  81          switch ($whence)
  82          {
  83              case SEEK_SET :
  84                  if ($offset < strlen($this->_buffers[$this->name]) && $offset >= 0) {
  85                      $this->position = $offset;
  86                      return true;
  87                  } else {
  88                      return false;
  89                  }
  90                  break;
  91  
  92              case SEEK_CUR :
  93                  if ($offset >= 0) {
  94                      $this->position += $offset;
  95                      return true;
  96                  } else {
  97                      return false;
  98                  }
  99                  break;
 100  
 101              case SEEK_END :
 102                  if (strlen($this->_buffers[$this->name]) + $offset >= 0) {
 103                      $this->position = strlen($this->_buffers[$this->name]) + $offset;
 104                      return true;
 105                  } else {
 106                      return false;
 107                  }
 108                  break;
 109  
 110              default :
 111                  return false;
 112          }
 113      }
 114  }
 115  // Register the stream
 116  stream_wrapper_register("buffer", "JBuffer");