[igorsk]

Originally Posted by elinares

I've tested both books with Calibre, it can not show or transform none of them. The unscrambling method described on sven.de/librie is exactly the same I implemented in LRFTools, but for some streams it does not work.

I'm going to pm you the books.

Thanks for the sample. I did a little debugging, and apparently the correct calculation looks like this:

uint8_t get_local_key(int streamlen, uint8_t key)
{
  if ( key && key <= 0xF0u )
    return streamlen % key + 0xF;
  else
    return 0;
}

Note the extra check and that only 8 bits of the key are used.