/// <summary>
/// HOWTO: Enter the algorithm you'd like to implement in this method.
/// </summary>
public void Execute()
{
// no progress, yet
ProgressChanged(0, 1);
if (InputCarrier == null)
{
GuiLogMessage("Please specify an input file.", NotificationLevel.Error);
return;
}
using (CStreamReader midiReader = InputCarrier.CreateReader())
{
MemoryStream secretStream;
MemoryStream outputStream = new MemoryStream();
MidiFileHandler midiHandler = new MidiFileHandler();
switch (settings.Action)
{
case 0: // Encryption
using (CStreamReader messageReader = InputData.CreateReader())
{
secretStream = new MemoryStream(messageReader.ReadFully());
midiHandler.HideOrExtract(midiReader, secretStream, new MemoryStream(), outputStream, (byte)(settings.MaxMessageBytesPerCarrierUnit * 2), false);
}
OutputCarrier = new CStreamWriter(outputStream.ToArray());
OnPropertyChanged("OutputCarrier");
break;
case 1: // Decryption
secretStream = new MemoryStream();
midiHandler.HideOrExtract(midiReader, secretStream, new MemoryStream(), outputStream, 1, true);
//OutputData = new CStreamWriter(secretStream.GetBuffer());
secretStream.Position = 0;
using (StreamReader secretReader = new StreamReader(secretStream))
{
OutputText = secretReader.ReadToEnd();
OnPropertyChanged("OutputText");
}
break;
}
}
// HOWTO: After you have changed an output property, make sure you announce the name of the changed property to the CT2 core.
//OnPropertyChanged("Difference");
// HOWTO: You can pass error, warning, info or debug messages to the CT2 main window.
//if (settings.Subtrahend < 0)
// GuiLogMessage("Subtrahend is negative", NotificationLevel.Debug);
// HOWTO: Make sure the progress bar is at maximum when your Execute() finished successfully.
ProgressChanged(1, 1);
}
/// <summary>
/// Reads the carrier image and calls Hide/Extract.
/// </summary>
public void Execute()
{
ProgressChanged(0, 1);
if (InputCarrier == null)
{
GuiLogMessage("Please provide an input carrier.", NotificationLevel.Error);
return;
}
if (InputPassword == null || InputPassword.Length == 0)
{
GuiLogMessage("Please provide a password.", NotificationLevel.Error);
return;
}
if (InputData == null && settings.Action == 0)
{
GuiLogMessage("Please provide a message.", NotificationLevel.Error);
return;
}
currentColorComponent = 0;
using (CStreamReader reader = InputCarrier.CreateReader())
{
using (Bitmap bitmap = new Bitmap(reader))
{
switch (settings.Action)
{
case 0: // hide message
this.imageInfo = null;
//make sure that the image is in RGB format
Bitmap image = PaletteToRGB(bitmap);
if (settings.CustomizeRegions)
{
hidedialog = new RegionHideForm(image, (int)InputData.Length);
if (hidedialog.ShowDialog() != System.Windows.Forms.DialogResult.OK)
{
return;
}
this.imageInfo = hidedialog.ImageInfo;
}
if (this.imageInfo == null)
{
CreateDefaultImageInfo(image);
if (imageInfo.Capacity < InputData.Length)
{
GuiLogMessage("The defined regions can only hold " + imageInfo.Capacity + " bytes of information, but the input consists of " + InputData.Length + " bytes.", NotificationLevel.Error);
return;
}
GuiLogMessage("The carrier image can hide " + imageInfo.Capacity + " bytes of information.", NotificationLevel.Info);
}
Hide(image, InputData.CreateReader(), InputPassword.CreateReader());
OnPropertyChanged("OutputCarrier");
break;
case 1: // extract message
try
{
Extract(bitmap, InputPassword.CreateReader());
OnPropertyChanged("OutputData");
if (settings.ShowRegions)
{
extractdialog = new RegionExtractForm(this.imageInfo);
extractdialog.ShowDialog();
}
}
catch (Exception ex)
{
GuiLogMessage("Wrong key or nothing hidden in the picture", NotificationLevel.Warning);
return;
}
break;
}
}
}
ProgressChanged(1, 1);
}