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    module_invoke_all('entity_update', $file, 'file');

  }

  unset($file->original);

  return $file;

}

  if (file_unmanaged_delete($file->uri)) {

    db_delete('file_managed')->condition('fid', $file->fid)->execute();

    db_delete('file_usage')->condition('fid', $file->fid)->execute();

    return TRUE;

  }

  return FALSE;

 * Temporary files are periodically cleaned. To make the file a permanent file,

 * assign the status and use file_save() to save the changes.

 *

 * @param $validators

 *   An optional, associative array of callback functions used to validate the

 *   file. See file_validate() for a full discussion of the array format.

 *   (Beware: this is not safe and should only be allowed for trusted users, if

 *   at all).

 * @param $destination

 * @param $replace

 *   Replace behavior when the destination file already exists:

 *   - FILE_EXISTS_REPLACE: Replace the existing file.

 *   - source: Path to the file before it is moved.

 *   - destination: Path to the file after it is moved (same as 'uri').

 */

  global $user;

  static $upload_cache;

  // Return cached objects without processing since the file will have

  // already been processed and the paths in _FILES will be invalid.

  }

  // Make sure there's an upload to process.

    return NULL;

  }

  // Check for file upload errors and return FALSE if a lower level system

  // error occurred. For a complete list of errors:

  // See http://php.net/manual/features.file-upload.errors.php.

    case UPLOAD_ERR_INI_SIZE:

    case UPLOAD_ERR_FORM_SIZE:

      return FALSE;

    case UPLOAD_ERR_PARTIAL:

    case UPLOAD_ERR_NO_FILE:

      return FALSE;

    case UPLOAD_ERR_OK:

      // Final check that this is a valid upload, if it isn't, use the

      // default error handler.

        break;

      }

    // Unknown error

    default:

      return FALSE;

  }

  $file = new stdClass();

  $file->uid      = $user->uid;

  $file->status   = 0;

  $file->filemime = file_get_mimetype($file->filename);

  $extensions = '';

  if (isset($validators['file_validate_extensions'])) {

    return FALSE;

  }

  // A URI may already have a trailing slash or look like "public://".

  if (substr($destination, -1) != '/') {

    $destination .= '/';

  // If file_destination() returns FALSE then $replace == FILE_EXISTS_ERROR and

  // there's an existing file so we need to bail.

  if ($file->destination === FALSE) {

    return FALSE;

  }

    else {

      $message .= ' ' . array_pop($errors);

    }

    return FALSE;

  }

  // directory. This overcomes open_basedir restrictions for future file

  // operations.

  $file->uri = $file->destination;

    watchdog('file', 'Upload error. Could not move uploaded file %file to destination %destination.', array('%file' => $file->filename, '%destination' => $file->uri));

    return FALSE;

  }

  // If we made it this far it's safe to record this file in the database.

  if ($file = file_save($file)) {

    // Add file to the cache.

    return $file;

  }

  return FALSE;