Rarjpeg detector

Rarjpeg file is a .jpeg file concatenated with a .rar file. (not necessarily jpg but also png, bmp etc)Some people use this technique to share different files storing them in images.For local and cached files the script performs a full reliable search for rar headers.When a file is not cached it requests a few bytes from the very end of a remote image to Detect if there are signs of Rar archive. (Doesn`t work if Rar archive FileNames are encrypted)