private static StringBuilder encodeByte(StringBuilder s, GeneratorLFSR generatorLFSR)
{
for (int i = 0; i < s.Length; i++) // makes XOR with xor and x for all digits
{
s[i] = toChar(toInt(s[i]) ^ generatorLFSR.getOneBitStandard());
}
return(s);
}
private static StringBuilder encodeByte3(StringBuilder s, GeneratorLFSR generatorLFSR)
{
for (int i = 0; i < s.Length; i++) // makes XOR for all digits
{
s[i] = toChar(toInt(s[i]) ^ generatorLFSR.getOneBitExtended());
generatorLFSR.updateTmp(toInt(s[i]));
}
return(s);
}
private static StringBuilder decodeByte(StringBuilder s, GeneratorLFSR generatorLFSR)
{
int y;
for (int i = 0; i < s.Length; i++) // makes XOR for all digits
{
y = toInt(s[i]);
s[i] = toChar((y ^ generatorLFSR.getOneBitExtended()));
generatorLFSR.updateTmp(y);
}
return(s);
}
private static byte[] exercise3encode(byte[] fileBytes, GeneratorLFSR generatorLFSR)
{
generatorLFSR.reset();
byte[] encodedBytes = new byte[fileBytes.Length];
StringBuilder s = new StringBuilder();
for (int i = 0; i < fileBytes.Length; i++) // for every byte in file
{
s.Clear();
s.Insert(0, Convert.ToString(fileBytes[i], 2).PadLeft(8, '0')); // we have string of 8 digits representing one byte. Example 00001100
s = encodeByte3(s, generatorLFSR);
encodedBytes[i] = Convert.ToByte(s.ToString(), 2);
}
return(encodedBytes);
}
private static string exercise1(GeneratorLFSR generatorLFSR, string seed)
{
String s = "";
Console.WriteLine();
for (int i = 0; i < seed.Length; i++)
{
for (int j = 0; j < generatorLFSR.tmp.Length; j++)
{
Console.Write(generatorLFSR.tmp[j]);
}
Console.WriteLine();
s += generatorLFSR.getOneBitStandard();
}
return(s);
}
static void Main(string[] args)
{
int i;
string s = "", f = ""; // seed, polynomial function
string fileName = "test";
GeneratorLFSR generatorLFSR;
byte[] fileBytes;
byte[] encodedBytes;
byte[] decodedBytes;
BinaryWriter br;
bool b = true;
string action = "";
s = "1101";
f = "1001";
//setFunctionAndSeed(ref f, ref s);
generatorLFSR = new GeneratorLFSR(f, s);
// testing, generate four bits
//Console.Write("{0,26}", "Y: ");
//Console.WriteLine("{0}{1}{2}{3}", generatorLFSR.getOneBit(), generatorLFSR.getOneBit(), generatorLFSR.getOneBit(), generatorLFSR.getOneBit());
while (b)
{
Console.WriteLine("\n****************************************************************************************************************\n"
+ "f: " + f + "\n"
+ "seed: " + s + "\n"
+ "file: " + fileName + "\n"
+ "last action: " + action + "\n"
+ "Choose action: change function and seed(c) | change file(cf) | resetGenerator(r) | 1 | 2e | 2d | 3e | 3d | q");
action = Console.ReadLine();
switch (action)
{
case "c":
setFunctionAndSeed(ref f, ref s);
generatorLFSR.init(f, s);
break;
case "cf":
setFile(ref fileName);
break;
case "r":
generatorLFSR.reset();
break;
case "1":
string e1 = exercise1(generatorLFSR, s);
Console.WriteLine("\nY: " + e1);
break;
case "2e":
// reading all bytes from file
fileBytes = File.ReadAllBytes(System.IO.Directory.GetCurrentDirectory() + @"\" + fileName + ".bin");
// encoding
encodedBytes = exercise2encode(fileBytes, generatorLFSR);
// write all bytes into the file
br = new BinaryWriter(new FileStream(System.IO.Directory.GetCurrentDirectory() + @"\" + fileName + "encoded.bin", FileMode.Create));
br.Write(encodedBytes);
br.Close();
break;
case "2d":
// reading all bytes from file
fileBytes = File.ReadAllBytes(System.IO.Directory.GetCurrentDirectory() + @"\" + fileName + "encoded.bin");
// decoding
decodedBytes = exercise2decode(fileBytes, generatorLFSR);
// write all bytes into the file
br = new BinaryWriter(new FileStream(System.IO.Directory.GetCurrentDirectory() + @"\" + fileName + ".bin", FileMode.Create));
br.Write(decodedBytes);
br.Close();
break;
case "3e":
// reading all bytes from file
fileBytes = File.ReadAllBytes(System.IO.Directory.GetCurrentDirectory() + @"\" + fileName + ".bin");
// encoding
encodedBytes = exercise3encode(fileBytes, generatorLFSR);
// write all bytes into the file
br = new BinaryWriter(new FileStream(System.IO.Directory.GetCurrentDirectory() + @"\" + fileName + "encoded.bin", FileMode.Create));
br.Write(encodedBytes);
br.Close();
break;
case "3d":
// reading all bytes from file
fileBytes = File.ReadAllBytes(System.IO.Directory.GetCurrentDirectory() + @"\" + fileName + "encoded.bin");
// decoding
decodedBytes = exercise3decode(fileBytes, generatorLFSR);
// write all bytes into the file
br = new BinaryWriter(new FileStream(System.IO.Directory.GetCurrentDirectory() + @"\" + fileName + ".bin", FileMode.Create));
br.Write(decodedBytes);
br.Close();
break;
case "q":
b = false;
break;
}
}
Console.ReadKey();
}
