Details of Okumura’s LZSS compression

In this post, I'll write something like a specification for the compressed data format we might name "Okumura's LZSS". I'll shorten the name to just "LZSS", but be advised that "LZSS" can have a much broader meaning in general. The audience is someone who already has a basic understanding of "LZSS" and "LZ77" compression. I've …