diff --git a/module/doc/control.php b/module/doc/control.php
index a98bd09dde..16822926ca 100755
--- a/module/doc/control.php
+++ b/module/doc/control.php
@@ -616,6 +616,7 @@ class doc extends control
      */
     public function delete($docID, $confirm = 'no', $from = 'list')
     {
+        $this->loadModel('file');
         if($confirm == 'no')
         {
             $type = $this->dao->select('type')->from(TABLE_DOC)->where('id')->eq($docID)->fetch('type');
@@ -637,7 +638,7 @@ class doc extends control
                 $this->loadModel('action')->create($file->objectType, $file->objectID, 'deletedFile', '', $extra=$file->title);
 
                 $fileRecord = $this->dao->select('id')->from(TABLE_FILE)->where('pathname')->eq($file->pathname)->fetch();
-                if(empty($fileRecord)) @unlink($file->realPath);
+                if(empty($fileRecord)) $this->file->unlinkFile($file);
             }
 
             /* if ajax request, send result. */
diff --git a/module/doc/model.php b/module/doc/model.php
index 48d24222c1..956b9132ee 100644
--- a/module/doc/model.php
+++ b/module/doc/model.php
@@ -643,9 +643,7 @@ class docModel extends model
         {
             foreach($files as $file)
             {
-                $pathName       = $this->file->getRealPathName($file->pathname);
-                $file->webPath  = $this->file->webPath . $pathName;
-                $file->realPath = $this->file->savePath . $pathName;
+                $this->loadModel('file')->setFileWebAndRealPaths($file);
                 if(strpos(",{$docContent->files},", ",{$file->id},") !== false) $docFiles[$file->id] = $file;
             }
         }
@@ -1748,9 +1746,7 @@ class docModel extends model
 
         foreach($files as $fileID => $file)
         {
-            $pathName       = $this->file->getRealPathName($file->pathname);
-            $file->realPath = $this->file->savePath . $pathName;
-            $file->webPath  = $this->file->webPath . $pathName;
+            $this->file->setFileWebAndRealPaths($file);
         }
 
         return $files;
diff --git a/module/doc/view/showfiles.html.php b/module/doc/view/showfiles.html.php
index 9266493800..ceee6b1376 100644
--- a/module/doc/view/showfiles.html.php
+++ b/module/doc/view/showfiles.html.php
@@ -84,12 +84,8 @@
           <div class='col'>
             <div class='lib-file'>
               <?php
-              $imageWidth = 0;
-              if(stripos('jpg|jpeg|gif|png|bmp', $file->extension) !== false and file_exists($file->realPath))
-              {
-                  $imageSize  = getimagesize($file->realPath);
-                  $imageWidth = $imageSize ? $imageSize[0] : 0;
-              }
+              $imageSize  = $this->loadModel('file')->getImageSize($file);
+              $imageWidth = $imageSize[0];
 
               $fileID = $file->id;
               $url    = helper::createLink('file', 'download', 'fileID=' . $fileID);
diff --git a/module/file/control.php b/module/file/control.php
index c4b3770221..3f610b3765 100755
--- a/module/file/control.php
+++ b/module/file/control.php
@@ -146,7 +146,7 @@ class file extends control
             $file->extension = $extension;
         }
 
-        if(file_exists($file->realPath))
+        if($this->file->fileExists($file))
         {
             /* If the mode is open, locate directly. */
             if($mode == 'open')
@@ -290,7 +290,7 @@ class file extends control
 
             /* Fix Bug #1518. */
             $fileRecord = $this->dao->select('id')->from(TABLE_FILE)->where('pathname')->eq($file->pathname)->fetch();
-            if(empty($fileRecord)) @unlink($file->realPath);
+            if(empty($fileRecord)) $this->file->unlinkFile($file);
 
             /* Update test case version for test case synchronization. */
             if($file->objectType == 'testcase') $this->file->updateTestcaseVersion($file);
@@ -500,7 +500,7 @@ class file extends control
     public function read($fileID)
     {
         $file = $this->file->getById($fileID);
-        if(empty($file) or !file_exists($file->realPath)) return false;
+        if(empty($file) or !$this->file->fileExists($file)) return false;
 
         $obLevel = ob_get_level();
         for($i = 0; $i < $obLevel; $i++) ob_end_clean();
diff --git a/module/file/model.php b/module/file/model.php
index 9fe5e57900..e5832e2ef0 100755
--- a/module/file/model.php
+++ b/module/file/model.php
@@ -60,9 +60,7 @@ class fileModel extends model
                 continue;
             }
 
-            $realPathName   = $this->getRealPathName($file->pathname);
-            $file->realPath = $this->savePath . $realPathName;
-            $file->webPath  = $this->webPath . $realPathName;
+            $this->setFileWebAndRealPaths($file);
         }
 
         return $files;
@@ -88,9 +86,7 @@ class fileModel extends model
             return $file;
         }
 
-        $realPathName   = $this->getRealPathName($file->pathname);
-        $file->realPath = $this->savePath . $realPathName;
-        $file->webPath  = $this->webPath . $realPathName;
+        $this->setFileWebAndRealPaths($file);
 
         return $file;
     }
@@ -117,9 +113,7 @@ class fileModel extends model
                 continue;
             }
 
-            $realPathName   = $this->getRealPathName($file->pathname);
-            $file->realPath = $this->savePath . $realPathName;
-            $file->webPath  = $this->webPath . $realPathName;
+            $this->setFileWebAndRealPaths($file);
         }
 
         return $files;
@@ -487,6 +481,20 @@ class fileModel extends model
         $this->webPath = $this->app->getWebRoot() . "data/upload/{$this->app->company->id}/";
     }
 
+    /**
+     * Set paths: realPath and webPath.
+     *
+     * @param  object $file
+     * @access public
+     * @return void
+     */
+    public function setFileWebAndRealPaths(&$file)
+    {
+        $pathName       = $this->getRealPathName($file->pathname);
+        $file->realPath = $this->savePath . $pathName;
+        $file->webPath  = $this->webPath . $pathName;
+    }
+
     /**
      * Insert the set image size code.
      *
@@ -512,6 +520,30 @@ class fileModel extends model
         return str_replace(' src="data/upload', ' onload="setImageSize(this,' . $maxSize . ')" src="data/upload', $content);
     }
 
+    /**
+     * Check file exists or not.
+     *
+     * @param  object $file
+     * @access public
+     * @return bool
+     */
+    public function fileExists($file)
+    {
+        return file_exists($file->realPath);
+    }
+
+    /**
+     * Unlink file.
+     *
+     * @param  object $file
+     * @access public
+     * @return bool|null
+     */
+    public function unlinkFile($file)
+    {
+        return @unlink($file->realPath);
+    }
+
     /**
      * Replace a file.
      *
@@ -1021,7 +1053,7 @@ class fileModel extends model
                 {
                     $file = $this->getById($imageID);
                     $this->dao->delete()->from(TABLE_FILE)->where('id')->eq($imageID)->exec();
-                    @unlink($file->realPath);
+                    $this->unlinkFile($file);
                 }
             }
             unset($_SESSION['album'][$uid]);
@@ -1087,9 +1119,12 @@ class fileModel extends model
      */
     public function getImageSize($file)
     {
+
+        if(stripos('jpg|jpeg|gif|png|bmp', $file->extension) === false) return array(0, 0, $$file->extension);
+
         if($this->config->file->storageType == 'fs')
         {
-            return file_exists($file->realPath) ? getimagesize($file->realPath) : 0;
+            return file_exists($file->realPath) ? getimagesize($file->realPath) : array(0, 0, $$file->extension);
         }
         else if($this->config->file->storageType == 's3')
         {
@@ -1155,7 +1190,7 @@ class fileModel extends model
             $this->dao->delete()->from(TABLE_FILE)->where('id')->in($deleteFiles)->exec();
             foreach($deleteFiles as $fileID)
             {
-                @unlink($oldObject->files[$fileID]->realPath);
+                $this->unlinkFile($oldObject->files[$fileID]);
                 $oldFiles = empty($oldFiles) ? '' : trim(str_replace(",$fileID,", ',', ",$oldFiles,"), ',');
             }
         }
@@ -1167,4 +1202,28 @@ class fileModel extends model
         $newObject->files = trim($oldFiles . $addedFiles, ',');
         $oldObject->files = join(',', array_keys($oldObject->files));
     }
+
+    /**
+     * Get last modified timestamp of file.
+     *
+     * @param  object $file
+     * @access public
+     * @return int
+     */
+    public function fileMTime($file)
+    {
+        return filemtime($file->realPath);
+    }
+
+    /**
+     * Get file size.
+     *
+     * @param  object $file
+     * @access public
+     * @return int
+     */
+    public function fileSize($file)
+    {
+        return filesize($file->realPath);
+    }
 }
diff --git a/module/file/view/printfiles.html.php b/module/file/view/printfiles.html.php
index ee78a6ecc0..9943b67a0d 100644
--- a/module/file/view/printfiles.html.php
+++ b/module/file/view/printfiles.html.php
@@ -54,12 +54,9 @@
               $uploadDate = $lang->file->uploadDate . substr($file->addedDate, 0, 10);
               $fileTitle  = "<i class='icon icon-file-text'></i> &nbsp;" . $file->title;
               if(strpos($file->title, ".{$file->extension}") === false && $file->extension != 'txt') $fileTitle .= ".{$file->extension}";
-              $imageWidth = 0;
-              if(stripos('jpg|jpeg|gif|png|bmp', $file->extension) !== false)
-              {
-                  $imageSize  = $this->file->getImageSize($file);
-                  $imageWidth = $imageSize ? $imageSize[0] : 0;
-              }
+
+              $imageSize  = $this->file->getImageSize($file);
+              $imageWidth = $imageSize[0];
 
               $fileSize = 0;
               /* Show size info. */
diff --git a/module/file/view/viewfiles.html.php b/module/file/view/viewfiles.html.php
index a41d89589d..c941508472 100644
--- a/module/file/view/viewfiles.html.php
+++ b/module/file/view/viewfiles.html.php
@@ -38,8 +38,8 @@ $(document).ready(function()
  /**
  * Delete a file.
  *
- * @param  int    $fileID
- * @param  object $obj
+ * @param  int    fileID
+ * @param  object obj
  * @access public
  * @return void
  */
@@ -58,10 +58,10 @@ function deleteFile(fileID, obj)
 /**
  * Download a file, append the mouse to the link. Thus we call decide to open the file in browser no download it.
  *
- * @param  int    $fileID
- * @param  int    $extension
- * @param  int    $imageWidth
- * @param  string $fileTitle
+ * @param  int    fileID
+ * @param  int    extension
+ * @param  int    imageWidth
+ * @param  string fileTitle
  * @access public
  * @return void
  */
@@ -157,7 +157,7 @@ function setFileName(fileID)
           if(stripos('jpg|jpeg|gif|png|bmp', $file->extension) !== false)
           {
               $imageSize  = $this->file->getImageSize($file);
-              $imageWidth = $imageSize ? $imageSize[0] : 0;
+              $imageWidth = $imageSize[0];
           }
 
           $fileSize = 0;
diff --git a/module/testtask/model.php b/module/testtask/model.php
index d0e3767943..3994789255 100755
--- a/module/testtask/model.php
+++ b/module/testtask/model.php
@@ -1397,9 +1397,7 @@ class testtaskModel extends model
         $stepFiles   = array();
         foreach($files as $file)
         {
-            $pathName = $this->file->getRealPathName($file->pathname);
-            $file->webPath  = $this->file->webPath . $pathName;
-            $file->realPath = $this->file->savePath . $pathName;
+            $this->file->setFileWebAndRealPaths($file);
             if($file->objectType == 'caseResult')
             {
                 $resultFiles[$file->objectID][$file->id] = $file;