private void btnDecode_Click(object sender, EventArgs e)
{
if (txtPath.Text != "")
{
FileStream inStream = new FileStream(decPath, FileMode.Open, FileAccess.Read);
int offset = 54;
inStream.Seek(offset, 0);
byte[] byteLength = new byte[4];
byteLength = LSB.Decode(inStream, 4);
int length = BitConverter.ToInt32(byteLength, 0);
inStream.Seek(offset + 4 * 8, 0);
byte[] buffer = new byte[length];
while (true)
{
try
{
buffer = LSB.Decode(inStream, length);
}
catch
{
MessageBox.Show("Ảnh này không chứa thông tin!", "Thông báo");
break;
}
byte[] hidenMessage = new byte[4 + buffer.Length];
hidenMessage = ByteArray(byteLength, buffer);
byte[] byteMessage = new byte[length];
for (int i = 0; i < length; i++)
{
byteMessage[i] = hidenMessage[i + 4];
}
UnicodeEncoding unicode = new UnicodeEncoding();
string result = unicode.GetString(byteMessage);
txtResult.Text = result;
MessageBox.Show("Giải mã thành công!", "Thông báo");
break;
}
inStream.Close();
}
else
{
MessageBox.Show("Vui lòng chọn ảnh để giải mã!", "Thông báo");
}
}
public void CreateFile(string stPath, string ndPath, string message)
{
FileStream inStream = new FileStream(stPath, FileMode.Open, FileAccess.Read);
int offset = 54;
inStream.Seek(0, 0);
byte[] header = new byte[offset];
inStream.Read(header, 0, offset);
FileStream outStream = new FileStream(ndPath, FileMode.Create, FileAccess.Write);
outStream.Write(header, 0, offset);
UnicodeEncoding unicode = new UnicodeEncoding();
byte[] newMessageByte = AddMessage(unicode.GetBytes(message));
inStream.Seek(offset, 0);
LSB.Encode(inStream, newMessageByte, outStream);
inStream.Close();
outStream.Close();
}
