Properly handle rar archives that do not have 'pack_size' block defined

RarInfo.php

@@ -48,7 +48,7 @@
  * @author     Hecks
  * @copyright  (c) 2010-2016 Hecks
  * @license    Modified BSD
- * @version    5.8
+ * @version    5.9
  */
 class RarInfo extends ArchiveReader
 {
@@ -715,7 +715,7 @@ protected function getFileBlockSummary($block, $quickOpen = false)
 		if (!empty($block['is_dir'])) {
 			$ret['is_dir'] = 1;
 		} elseif (!$quickOpen && !in_array(self::BLOCK_FILE, $this->headersOnly['type'], false)) {
-			$packSize = empty($block['pack_size']) ? 0 : $block['pack_size'];
+			$packSize = empty($block['pack_size']) ? $block['data_size'] : $block['pack_size'];
 			$start = $this->start + $block['offset'] + $block['head_size'];
 			$end   = min($this->end, $start + $packSize - 1);
 			$ret['range'] = "{$start}-{$end}";