@achow101 noted we don't reject them therefore they must be silently accepted. This is not part of the specs, we should remove them. Also cc @sipa.

I can take care of this.
{
        if (chHeader == 2 || chHeader == 3)
            return COMPRESSED_SIZE;
        if (chHeader == 4 || chHeader == 6 || chHeader == 7)
            return SIZE;
        return 0;
    }
    
    void Invalidate()