Input
=====
The program reads 1's and 0's. It skips all other characters.
It throws an input_Exception if the binary digits are not a multiple of 8.
It throws an ip_Exception if there are less than 20 octets in the input.

Dependencies 
============
double
binaryInput
ipdatagram <- double
packet <- binaryInput, ipdatagram

input.txt

Steps
=====
val dirname = "C:/Documents and Settings/Tazeen/My Documents/Classes/Thesis/SMLprograms/";
use (dirname^"double.sml");
use (dirname^"binaryInput.sml");
use (dirname ^ "ipdatagram.sml");
use (dirname^"packet.sml");
val ph = packet.getpacket(dirname^"input.txt");