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();
        }
    }
}

C++: #include <vector>
#include <iostream>
#include <fstream>
#include <sstream>

typedef struct {
    int s[4];
}userI;

class jit{
public:
    void decode( std::string& file, std::vector<userI>& ui ) {
        std::ifstream f( file.c_str(), std::ios_base::in );
        fileBuffer = std::string( ( std::istreambuf_iterator<char>( f ) ), std::istreambuf_iterator<char>() );
        f.close();
        for( std::vector<userI>::iterator t = ui.begin(); t != ui.end(); t++ ) {
            if( !decode( ( *t ).s ) ) break;
        }
        std::cout << "\n\n";
    }
private:
    bool decode( int* ui ) {
        int l = 0, t = 0, p = 0, c = 0, a = 0;
        for( std::string::iterator i = fileBuffer.begin(); i != fileBuffer.end(); i++ ) {
            if( p == ui[0] && l == ui[1] && t == ui[2] && c == ui[3] ) {
                if( *i == '!' )  return false;
                std::cout << *i; return true;
            }
            if( *i == '\n' )      { l++; t = c = 0; }  
            else if( *i == '\t' ) { t++; c = 0; }
            else if( *i == '\f' ) { p++; l = t = c = 0; }
            else                  { c++;}
        }
        return false;
    }
    std::string fileBuffer;
};
void getUserInput( std::vector<userI>& u ) {
    std::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";
    
    std::stringstream ss( h );
    userI a;
    int x = 0;
    while( std::getline( ss, h, ' ' ) ) {
        a.s[x] = atoi( h.c_str() );
        if( ++x == 4 ) {
            u.push_back( a );
            x = 0;
        }
    }
}
int main( int argc, char* argv[] ) {
    std::vector<userI> ui;
    getUserInput( ui );

    jit j;
    j.decode( std::string( "theRaven.txt" ), ui );
    return 0;
}