Is it possible to make text files smaller than using UNICODE? Of course. Check TCODE!
Encoder:
http://serwer.zygtech.pl/tencoder.php
Decoder:
http://serwer.zygtech.pl/tdecoder.php
Encoder source code:
http://serwer.zygtech.pl/tencoder.code.txt
Decoder source code:
http://serwer.zygtech.pl/tdecoder.code.txt
Here is written in C decoder for Linux:
http://serwer.zygtech.pl/tdecode
And source code for it:
http://serwer.zygtech.pl/tdecode.c.txt
It’s not OpenSource! The code and idea entirely belongs to Chris Hrybacz.