2003.03.26 23:30 "Re: LZW and 4bit tiffs", by Michael Still

I'm having great fun here trying to write a LZW decompression function.

There is one case in decompression (I think it was) where a code can be used which doesn't exist yet. Have you googled yet? There's a really good Dr Dobbs article from ages ago about this.

I use the following code for LZW decompression:

http://www.stillhq.com/extracted/pandaedit/lzw.cpp
http://www.stillhq.com/extracted/pandaedit/lzw.h

(the rest of the code in that directory uses this if you need calling examples)

Note that it's in C++, but once you've ditched the use of STL templates for vectors etc that shouldn't be too bad. A couple of things to note:

• If you're in the US this is all covered by a Patent which hasn't yet expired (later this year it does)
• My code is covered by the GNU GPL

Cheers,
Mikal

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