Scanning a file

[netvaibhav at gmail.com]

I think implementing a finite state automaton would be a good (best?)
solution. I have drawn a FSM for you (try viewing the following in
fixed width font). Just increment the count when you reach state 5.

                    <---------------|
                   |                |
        0      0   |  1      0      |0
 -->[1]--->[2]--->[3]--->[4]--->[5]-|
     ^ |    |      ^ |     |      |
    1| |<---|      | |     |1     |1
     |_|    1      |_|     |      |
     ^             0       |      |
     |---------------------|<-----|

If you don't understand FSM's, try getting a book on computational
theory (the book by Hopcroft & Ullman is great.)

Here you don't have special cases whether reading in blocks or reading
whole at once (as you only need one byte at a time).

Vaibhav