Stream

[Phoenix]

I would keep a seperate hashtable with the keywords and the specific filenames. Searching in a well sorted hashtable is a lot faster than running around in a stream, because you would have to scan the whole stream (worst case) to find the keyword - in the (sorted) hashtable you only have to match up the hash value, and you can do that character for character, so when you have the hash abcdef and you start at the beginning and find baaaaa in the list you know that you don't have to look further because there won't be another hash starting with an a later on.