Well, this is a pretty open question, I will give you my suggestions:
- If it is a finite list, you can use a Hash or a Dictionary, where the keys are the Codes and map them to the corresponding value, in your case, Code_128
- Some scanners have software installed that allow you to change what has been read to a new value, format it, etc.
If you need a bigger insight please, give us more detail about the environment you are using. Hope that helps,