You want to write a GIF Viever? A Uudecode Program?
So you need information about the GIF Specification,
the LZW Syntax or the UUDecode Algorithm.

Hi, this is the HomePage of
Joerg Buchwitz from Germany

It is also available in German.

I wasted plenty of time finding out how to convert data of some specific type
into another.
And I hope other Persons may benefit from my labour.

Unfortunately I am a German and don't know the English Language very well.
Therefore, the documents on my HomePage are written in that fascinating language of mine.
But I tried to translate them into English.

GIF Specification
UUEncode Specification

This Web Server (www.serve.com/jb) was created on March 01, 1996,
and last updated on July 29, 2003.

Please feel free to send me questions, bug reports, suggestions, money
or other amazing things. No letter bombs, please.

German Version here