lib/fileio/ifs.php

   1 <?php\r
   2 /**\r
   3  * FileIO Index File System\r
   4  *\r
   5  * 把遠端圖檔的各種屬性作本機快取及記錄，方便程式取用\r
   6  *\r
   7  * @package PMCLibrary\r
   8  * @version $Id: ifs.php 393 2007-04-30 11:25:29Z scribe $\r
   9  * @date $Date: 2007-04-30 19:25:29 +0800 (星期一, 30 四月 2007) $\r
  10  */\r
  11 \r
  12 class IndexFS{\r
  13         var $logfile, $backend, $index, $modified;\r
  14 \r
  15         /* 建構元 */\r
  16         function IndexFS($logfile){\r
  17                 $this->logfile = $logfile; // 索引記錄檔位置\r
  18         }\r
  19 \r
  20         /* 初始化 */\r
  21         function init(){\r
  22                 switch($this->backend){\r
  23                         case 'log':\r
  24                                 touch($this->logfile); chmod($this->logfile, 0666); // 建立索引檔\r
  25                                 break;\r
  26                         case 'sqlite2':\r
  27                                 $execText = 'CREATE TABLE IndexFS (\r
  28                                 "imgName" VARCHAR(20)  NOT NULL PRIMARY KEY,\r
  29                                 "imgSize" INTEGER  NOT NULL,\r
  30                                 "imgURL" VARCHAR(255)  NOT NULL\r
  31                                 ); CREATE INDEX IDX_IndexFS_imgName ON IndexFS(imgName);';\r
  32                                 sqlite_exec($this->index, $execText);\r
  33                                 break;\r
  34                 }\r
  35         }\r
  36 \r
  37         /* 開啟索引檔並讀入 */\r
  38         function openIndex(){\r
  39                 if(extension_loaded('SQLite')){\r
  40                         $this->backend = 'sqlite2';\r
  41                         $this->index = sqlite_open($this->logfile, 0666);\r
  42                         if(sqlite_num_rows(sqlite_query($this->index, "SELECT name FROM sqlite_master WHERE name LIKE 'IndexFS'"))===0) $this->init();\r
  43                 }else{\r
  44                         $this->backend = 'log';\r
  45                         $this->modified = false;\r
  46                         if(!file_exists($this->logfile)){ $this->init(); return; }\r
  47                         if(filesize($this->logfile)==0) return;\r
  48                         $indexlog = file($this->logfile); $indexlog_count = count($indexlog); // 讀入索引檔並計算目前筆數\r
  49                         $this->index = array();\r
  50                         for($i = 0; $i < $indexlog_count; $i++){\r
  51                                 if(!($trimline = rtrim($indexlog[$i]))) continue; // 本行無意義\r
  52                                 $field = explode("\t\t", $trimline);\r
  53                                 $this->index[$field[0]] = array('imgSize' => $field[1], 'imgURL' => $field[2]);\r
  54                                 // 索引格式: 檔名 檔案大小    對應路徑\r
  55                         }\r
  56                         unset($indexlog);\r
  57                 }\r
  58         }\r
  59 \r
  60         /* 索引是否存在 */\r
  61         function beRecord($id){\r
  62                 switch($this->backend){\r
  63                         case 'log':\r
  64                                 return isset($this->index[$id]);\r
  65                         case 'sqlite2':\r
  66                                 return (sqlite_fetch_array(sqlite_query($this->index, 'SELECT imgName FROM IndexFS WHERE imgName = "'.sqlite_escape_string($id).'"'), SQLITE_ASSOC) ? true : false);\r
  67                 }\r
  68         }\r
  69 \r
  70         /* 取得一筆索引 */\r
  71         function getRecord($id){\r
  72                 switch($this->backend){\r
  73                         case 'log':\r
  74                                 return isset($this->index[$id]) ? $this->index[$id] : false;\r
  75                         case 'sqlite2':\r
  76                                 return sqlite_fetch_array(sqlite_query($this->index, 'SELECT * FROM IndexFS WHERE imgName = "'.sqlite_escape_string($id).'"'), SQLITE_ASSOC);\r
  77                 }\r
  78         }\r
  79 \r
  80         /* 新增一筆索引 */\r
  81         function addRecord($id, $imgSize, $imgURL){\r
  82                 switch($this->backend){\r
  83                         case 'log':\r
  84                                 $this->modified = true;\r
  85                                 $this->index[$id] = array('imgSize' => $imgSize, 'imgURL' => $imgURL); // 加入索引之中\r
  86                                 break;\r
  87                         case 'sqlite2':\r
  88                                 sqlite_exec($this->index, 'INSERT INTO IndexFS (imgName, imgSize, imgURL) VALUES ("'.sqlite_escape_string($id).'", '.sqlite_escape_string($imgSize).', "'.sqlite_escape_string($imgURL).'");');\r
  89                                 break;\r
  90                 }\r
  91         }\r
  92 \r
  93         /* 刪除一筆索引 */\r
  94         function delRecord($id){\r
  95                 switch($this->backend){\r
  96                         case 'log':\r
  97                                 if(isset($this->index[$id])){ unset($this->index[$id]); $this->modified = true; return true; }\r
  98                                 return false;\r
  99                         case 'sqlite2':\r
 100                                 return sqlite_exec($this->index, 'DELETE FROM IndexFS WHERE imgName = "'.sqlite_escape_string($id).'";');\r
 101                 }\r
 102         }\r
 103 \r
 104         /* 儲存索引變更 */\r
 105         function saveIndex(){\r
 106                 if($this->backend=='log' && $this->modified){ // 如果有修改索引就回存\r
 107                         $indexlog = '';\r
 108                         if(count($this->index)) foreach($this->index as $ikey => $ival){ $indexlog .= $ikey."\t\t".$ival['imgSize']."\t\t".$ival['imgURL']."\n"; } // 有資料才跑迴圈\r
 109                         $fp = fopen($this->logfile, 'w');\r
 110                         fwrite($fp, $indexlog);\r
 111                         fclose($fp);\r
 112                 }elseif($this->backend=='sqlite2'){\r
 113                         sqlite_close($this->index);\r
 114                 }\r
 115         }\r
 116 }\r
 117 ?>