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   1  <?php
   2  /**
   3   * MyBB 1.6
   4   * Copyright 2010 MyBB Group, All Rights Reserved
   5   *
   6   * Website: http://mybb.com
   7   * License: http://mybb.com/about/license
   8   *
   9   * $Id: disk.php 5297 2010-12-28 22:01:14Z Tomm $
  10   */
  11  
  12  /**
  13   * Disk Cache Handler
  14   */
  15  class diskCacheHandler
  16  {
  17      /**
  18       * Connect and initialize this handler.
  19       *
  20       * @return boolean True if successful, false on failure
  21       */
  22  	function connect($silent=false)
  23      {
  24          if(!@is_writable(MYBB_ROOT."cache"))
  25          {
  26              return false;
  27          }
  28          
  29          return true;
  30      }
  31      
  32      /**
  33       * Retrieve an item from the cache.
  34       *
  35       * @param string The name of the cache
  36       * @param boolean True if we should do a hard refresh
  37       * @return mixed Cache data if successful, false if failure
  38       */
  39      
  40  	function fetch($name, $hard_refresh=false)
  41      {
  42          if(!@file_exists(MYBB_ROOT."/cache/{$name}.php"))
  43          {
  44              return false;
  45          }
  46          
  47          if(!isset($this->cache[$name]) || $hard_refresh == true)
  48          {
  49              @include(MYBB_ROOT."/cache/{$name}.php");
  50          }
  51          else
  52          {
  53              @include_once(MYBB_ROOT."/cache/{$name}.php");
  54          }
  55          
  56          // Return data
  57          return $$name;
  58      }
  59      
  60      /**
  61       * Write an item to the cache.
  62       *
  63       * @param string The name of the cache
  64       * @param mixed The data to write to the cache item
  65       * @return boolean True on success, false on failure
  66       */
  67  	function put($name, $contents)
  68      {
  69          global $mybb;
  70          if(!is_writable(MYBB_ROOT."cache"))
  71          {
  72              $mybb->trigger_generic_error("cache_no_write");
  73              return false;
  74          }
  75  
  76          $cache_file = fopen(MYBB_ROOT."cache/{$name}.php", "w") or $mybb->trigger_generic_error("cache_no_write");
  77          flock($cache_file, LOCK_EX);
  78          $cache_contents = "<?php\n\n/** MyBB Generated Cache - Do Not Alter\n * Cache Name: $name\n * Generated: ".gmdate("r")."\n*/\n\n";
  79          $cache_contents .= "\$$name = ".var_export($contents, true).";\n\n ?>";
  80          fwrite($cache_file, $cache_contents);
  81          flock($cache_file, LOCK_UN);
  82          fclose($cache_file);
  83          
  84          return true;
  85      }
  86      
  87      /**
  88       * Delete a cache
  89       *
  90       * @param string The name of the cache
  91       * @return boolean True on success, false on failure
  92       */
  93  	function delete($name)
  94      {
  95          return @unlink(MYBB_ROOT."/cache/{$name}.php");
  96      }
  97      
  98      /**
  99       * Disconnect from the cache
 100       */
 101  	function disconnect()
 102      {
 103          return true;
 104      }
 105      
 106      /**
 107       * Select the size of the disk cache 
 108       *
 109       * @param string The name of the cache
 110       * @return integer the size of the disk cache
 111       */
 112  	function size_of($name='')
 113      {
 114          if($name != '')
 115          {
 116              return @filesize(MYBB_ROOT."/cache/{$name}.php");
 117          }
 118          else
 119          {
 120              $total = 0;
 121              $dir = opendir(MYBB_ROOT."/cache");
 122              while(($file = readdir($dir)) !== false)
 123              {
 124                  if($file == "." || $file == ".." || $file == ".svn" || !is_file(MYBB_ROOT."/cache/{$file}"))
 125                  {
 126                      continue;
 127                  }
 128                  
 129                  $total += filesize(MYBB_ROOT."/cache/{$file}");
 130              }
 131              return $total;
 132          }
 133      }
 134  }
 135  
 136  ?>