classes/varstream.php

   1 <?php
   2 /***************************************************************************
   3  *  Copyright (C) 2003-2008 Polytechnique.org                              *
   4  *  http://opensource.polytechnique.org/                                   *
   5  *                                                                         *
   6  *  This program is free software; you can redistribute it and/or modify   *
   7  *  it under the terms of the GNU General Public License as published by   *
   8  *  the Free Software Foundation; either version 2 of the License, or      *
   9  *  (at your option) any later version.                                    *
  10  *                                                                         *
  11  *  This program is distributed in the hope that it will be useful,        *
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of         *
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the          *
  14  *  GNU General Public License for more details.                           *
  15  *                                                                         *
  16  *  You should have received a copy of the GNU General Public License      *
  17  *  along with this program; if not, write to the Free Software            *
  18  *  Foundation, Inc.,                                                      *
  19  *  59 Temple Place, Suite 330, Boston, MA  02111-1307  USA                *
  20  ***************************************************************************/
  21
  22 class VarStream
  23 {
  24     // Stream handler to read from global variables
  25     private $varname;
  26     private $position;
  27
  28     public function stream_open($path, $mode, $options, &$opened_path)
  29     {
  30         $url            = parse_url($path);
  31         $this->varname  = $url['host'];
  32         $this->position = 0;
  33         if (!isset($GLOBALS[$this->varname]))
  34         {
  35             trigger_error('Global variable '.$this->varname.' does not exist', E_USER_WARNING);
  36             return false;
  37         }
  38         return true;
  39     }
  40
  41     public function stream_close()
  42     {
  43     }
  44
  45     public function stream_read($count)
  46     {
  47         $ret = substr($GLOBALS[$this->varname], $this->position, $count);
  48         $this->position += strlen($ret);
  49         return $ret;
  50     }
  51
  52     public function stream_write($data)
  53     {
  54         $len = strlen($data);
  55         if ($len > $this->position + strlen($GLOBALS[$this->varname])) {
  56             str_pad($GLOBALS[$this->varname], $len);
  57         }
  58
  59         $GLOBALS[$this->varname] = substr_replace($GLOBALS[$this->varname], $data, $this->position, $len);
  60         $this->position += $len;
  61     }
  62
  63     public function stream_eof()
  64     {
  65         return $this->position >= strlen($GLOBALS[$this->varname]);
  66     }
  67
  68     public function stream_tell()
  69     {
  70         return $this->position;
  71     }
  72
  73     public function stream_seek($offs, $whence)
  74     {
  75         switch ($whence) {
  76             case SEEK_SET:
  77                 $final = $offs;
  78                 break;
  79
  80             case SEEK_CUR:
  81                 $final += $offs;
  82                 break;
  83
  84             case SEEK_END:
  85                 $final = strlen($GLOBALS[$this->varname]) + $offs;
  86                 break;
  87         }
  88
  89         if ($final < 0) {
  90             return -1;
  91         }
  92         $this->position = $final;
  93         return 0;
  94     }
  95
  96     public function stream_flush()
  97     {
  98     }
  99
 100     static public function init()
 101     {
 102         stream_wrapper_register('var','VarStream');
 103     }
 104 }
 105
 106 // vim:set et sw=4 sts=4 sws=4 foldmethod=marker enc=utf-8:
 107 ?>