Isn’t that a question for the people who make Lan Messenger? I have no idea.

It is possible to embed LZW algorithm in LAN Messenger because I want to Compress and Decompress file and embed it in LAN Messenger? I want to use a Visual Basic or Visual C# programming language.

I hope you would reply immediately. Thank you.

In the encoder the slowest part is to determine whether the incoming symbol + the stored string is in the table of the range of 0-to the max code of the table. Entries used in the table grow with the incoming symbols in the encoder.

The search part can be divided into the SYMBOL and the STRING
parts both in the encoder and decoder.

I have solved it already. Besides three global pointers, four static local vars in input_code and output_code repectively should be changed to global and should be set to zero before each compress and expand.

Maybe it’s not very formal and strict, but it give me a huge help, thank you.

When I created this program, it was designed to run one time – I didn’t try to make a library component that could be reused. There are many places things could go wrong if you try to run the compressor twice, so you are going to have to keep looking.

- Mark

I have tried this code and made some changes. I modify the params of compress() and expand() to compress from one specified character stream(in memory) and expand to a memory address.
However, I find that if I compress a same string and expand it twice, the result of expanding of the second time is wrong, the first is right.
I memset zero to those global memory vars before compressing. Why does it happen? Anything don’t I concern?