Task: Just in time processing on a character stream
C#: using System;
using System.Collections.Generic;
using System.Linq;

namespace JustInTimeProcessing {
    struct UserInput {
        public UserInput(string ff, string lf, string tb, string sp) {
            FormFeed = (char)int.Parse(ff);
            LineFeed = (char)int.Parse(lf);
            Tab = (char)int.Parse(tb);
            Space = (char)int.Parse(sp);
        }

        public char FormFeed { get; }
        public char LineFeed { get; }
        public char Tab { get; }
        public char Space { get; }
    }

    class Program {
        static List<UserInput> GetUserInput() {
            string h = "0 18 0 0 0 68 0 1 0 100 0 32 0 114 0 45 0 38 0 26 0 16 0 21 0 17 0 59 0 11 "
                + "0 29 0 102 0 0 0 10 0 50 0 39 0 42 0 33 0 50 0 46 0 54 0 76 0 47 0 84 2 28";
            return h.Split(' ')
                .Select((x, idx) => new { x, idx })
                .GroupBy(x => x.idx / 4)
                
                .Select(g => {
                    var ge = g.Select(a => a.x).ToArray();
                    return new UserInput(ge[0], ge[1], ge[2], ge[3]);
                })
                .ToList();
        }

        static void Decode(string filename, List<UserInput> uiList) {
            string text = System.IO.File.ReadAllText(filename);

            bool Decode2(UserInput ui) {
                char f = (char)0;
                char l = (char)0;
                char t = (char)0;
                char s = (char)0;

                foreach (char c in text) {
                    if (f == ui.FormFeed && l == ui.LineFeed && t == ui.Tab && s == ui.Space) {
                        if (c == '!') return false;
                        Console.Write(c);
                        return true;
                    }
                    if (c == '\u000c') {
                        f++; l = (char)0; t = (char)0; s = (char)0;
                    } else if (c == '\n') {
                        l++; t = (char)0; s = (char)0;
                    } else if (c == '\t') {
                        t++; s = (char)0;
                    } else {
                        s++;
                    }
                }

                return false;
            }

            foreach (UserInput ui in uiList) {
                if (!Decode2(ui)) {
                    break;
                }
            }
            Console.WriteLine();
        }

        static void Main(string[] args) {
            var uiList = GetUserInput();
            Decode("theraven.txt", uiList);

            Console.ReadLine();
        }
    }
}

Python: import sys

class UserInput:
    def __init__(self,chunk):
        self.formFeed = int(chunk[0])
        self.lineFeed = int(chunk[1])
        self.tab = int(chunk[2])
        self.space = int(chunk[3])

    def __str__(self):
        return "(ff=%d; lf=%d; tb=%d; sp%d)" % (self.formFeed,self.lineFeed,self.tab,self.space)

def chunks(l,n):
    for i in xrange(0, len(l), n):
        yield l[i:i+n]

def getUserInput():
    h = "0 18 0 0 0 68 0 1 0 100 0 32 0 114 0 45 0 38 0 26 0 16 0 21 0 17 0 59 0 11 "\
        "0 29 0 102 0 0 0 10 0 50 0 39 0 42 0 33 0 50 0 46 0 54 0 76 0 47 0 84 2 28"
    ha = h.split()
    return [UserInput(chunk) for chunk in chunks(ha, 4)]

def decode(filename,uiList):
    f = open(filename, "r")
    text = f.read()

    def decode2(ui):
        f = 0
        l = 0
        t = 0
        s = 0
        for c in text:
            if f == ui.formFeed and l == ui.lineFeed and t == ui.tab and s == ui.space:
                if c == '!':
                    return False
                sys.stdout.write(c)
                return True
            if c == '\u000c':
                f=f+1
                l=0
                t=0
                s=0
            elif c == '\n':
                l=l+1
                t=0
                s=0
            elif c == '\t':
                t=t+1
                s=0
            else:
                s=s+1
        return False

    for ui in uiList:
        if not decode2(ui):
            break
    print



uiList = getUserInput()
decode("theRaven.txt", uiList)