public static bool stegoChar(string txt, string fileName, string newFileName, int[] stegoKey, List <bool> compMsg)
{
long noChars = WordDocument.noChars(fileName);
if ((noChars - 1) * 4 < txt.Length * 8)
{
return(false);
}
List <bool> msg;
if (compMsg != null)
{
msg = compMsg;
}
else
{
msg = txtToBinary(txt);
}
string coverString = WordDocument.returnDocument(fileName);
List <char> cover = coverString.ToCharArray().ToList();
string stegoText = "";
int j = 0;
int k = 0;
do
{
char pref = cover[k++];
stegoText += pref;
if (msg[j++])
{
stegoText += Convert.ToChar(stegoKey[0]);
}
if (msg[j++])
{
stegoText += Convert.ToChar(stegoKey[1]);
}
if (msg[j++])
{
stegoText += Convert.ToChar(stegoKey[2]);
}
if (msg[j++])
{
stegoText += Convert.ToChar(stegoKey[3]);
}
} while (k < cover.Count - 1 && j < msg.Count);
if (k < cover.Count - 1)
{
stegoText += coverString.Substring(k);
}
WordDocument.createWord(stegoText, newFileName);
return(true);
}
public static string stegoRet(string fileName)
{
string toRet = "";
List <bool> binary = new List <bool>();
string stego = WordDocument.returnDocument(fileName);
List <char> chars;
chars = stego.ToCharArray().ToList();
int end = 0;
int bajt = 0;
int i;
for (i = 0; i < chars.Count; i++)
{
if (chars[i] == ' ')
{
if (chars[i + 1] == ' ')
{
binary.Add(true);
i++;
end = 0;
}
else
{
binary.Add(false);
end++;
if (end > 7 && bajt == 7)
{
break;
}
}
bajt = (bajt == 7) ? 0 : bajt + 1;
}
}
i = 0;
while (i < binary.Count)
{
List <bool> oneByte = binary.GetRange(i, 8);
int value = 0;
for (int j = oneByte.Count - 1; j >= 0; j--)
{
if (oneByte[j])
{
value += Convert.ToInt16(Math.Pow(2, oneByte.Count - j - 1));
}
}
toRet += (char)value;
i += 8;
}
return(toRet);
}
public static bool stego(string txt, string fileName, string newFileName)
{
int noWords = WordDocument.noWords(fileName);
if (noWords - 1 < txt.Length * 8)
{
return(false);
}
List <bool> msg = txtToBinary(txt);
string coverString = WordDocument.returnDocument(fileName);
List <char> cover = coverString.ToList();
string stegoText = "";
int j = 0;
int k = 0;
do
{
char pref = cover[k++];
if (pref == ' ')
{
if (msg[j])
{
stegoText += pref + " ";
}
else
{
stegoText += pref;
}
j++;
}
else
{
stegoText += pref;
}
} while (k < cover.Count - 1 && j < msg.Count);
if (j < msg.Count)
{
if (msg[j])
{
stegoText += " ";
}
else
{
stegoText += " ";
}
}
if (k < cover.Count - 1)
{
stegoText += coverString.Substring(k);
}
WordDocument.createWord(stegoText, newFileName);
return(true);
}
public static Dictionary <char, int> stegoHuffman(string txt, string fileName, string newFileName)
{
List <bool> msg = new List <bool>();
HuffmanTree huffTree = new HuffmanTree();
txt += '\0';
huffTree.build(txt);
huffTree.Root.Traverse1();
List <bool> encoded = huffTree.encode(txt);
foreach (bool b in encoded)
{
msg.Add(b);
}
int noWords = WordDocument.noWords(fileName);
if (noWords - 1 < msg.Count)
{
return(null);
}
string coverString = WordDocument.returnDocument(fileName);
List <char> cover = coverString.ToCharArray().ToList();
string stegoText = "";
int j = 0;
int k = 0;
do
{
char pref = cover[k++];
if (pref == ' ')
{
if (msg[j])
{
stegoText += pref + " ";
}
else
{
stegoText += pref;
}
j++;
}
else
{
stegoText += pref;
}
} while (k < cover.Count - 1 && j < msg.Count);
if (j < msg.Count)
{
if (msg[j])
{
stegoText += " ";
}
else
{
stegoText += " ";
}
}
if (k < cover.Count - 1)
{
stegoText += coverString.Substring(k);
}
WordDocument.createWord(stegoText, newFileName);
return(huffTree.Frequencies);
}