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);
}