public CheatDetailsForm(Cheat cheat, bool isNew)
{
InitializeComponent();
this.cheat = cheat;
this.isNew = isNew;
}
public static Cheat ParseGameGenieCode(string gameGenieCode)
{
if (!IsValidGameGenieCode(gameGenieCode))
{
return(null);
}
byte[] nybbles = new byte[gameGenieCode.Length];
for (int index = 0; index < gameGenieCode.Length; index++)
{
nybbles[index] = gameGenieCharToNybble[gameGenieCode[index]];
}
Cheat newCheat = new Cheat();
newCheat.Address = DecodeGameGenieCodeAddress(nybbles);
if (gameGenieCode.Length == 6)
{
newCheat.Value = (byte)(((nybbles[1] & 7) << 4) | ((nybbles[0] & 8) << 4) | (nybbles[0] & 7) | (nybbles[5] & 8));
}
else // 8
{
newCheat.Value = (byte)(((nybbles[1] & 7) << 4) | ((nybbles[0] & 8) << 4) | (nybbles[0] & 7) | (nybbles[7] & 8));
newCheat.CompareValue = (byte)(((nybbles[7] & 7) << 4) | ((nybbles[6] & 8) << 4) | (nybbles[6] & 7) | (nybbles[5] & 8));
newCheat.NeedsComparison = true;
}
newCheat.Description = "Game Genie Code: " + gameGenieCode;
return(newCheat);
}
private void OnValidatingGameGenieCode(object sender, CancelEventArgs cancelEventArgs)
{
string gameGenieCode = gameGenieCodeTextBox.Text.Trim().ToUpper();
if (gameGenieCode.Length > 0 && !Cheat.IsValidGameGenieCode(gameGenieCode))
{
errorProvider.SetError(gameGenieCodeTextBox, "Invalid Game Genie code");
cancelEventArgs.Cancel = true;
}
}
public bool AddCheat(Cheat cheat)
{
if (cheats.ContainsKey(cheat.Address))
{
MessageBox.Show("A cheat is already patched at address: " + Hex.Format(cheat.Address), "Add Cheat", MessageBoxButtons.OK, MessageBoxIcon.Error);
return(false);
}
cheats[cheat.Address] = cheat;
PatchCheats();
return(true);
}
private void OnCheatNewManualEntry(object sender, EventArgs eventArgs)
{
Cheat newCheat = new Cheat();
CheatDetailsForm cheatDetailsForm = new CheatDetailsForm(newCheat, true);
if (cheatDetailsForm.ShowDialog() == DialogResult.Cancel)
{
return;
}
cheatSystem.AddCheat(newCheat);
UpdateCheatListBox();
}
public void PatchCheats()
{
if (oldProcessorReadByte != null)
{
UnpatchCheats();
}
this.oldProcessorReadByte = processor.ReadByte;
processor.ReadByte = (address) =>
{
// check for patched cheat at givne address
Cheat cheat = null;
cheats.TryGetValue(address, out cheat);
// if no cheat, just go through
if (cheat == null)
{
return(oldProcessorReadByte(address));
}
// if cheat not active, just go through
if (!cheat.Active)
{
return(oldProcessorReadByte(address));
}
// if cheat is substitute only, apply substitution
if (!cheat.NeedsComparison)
{
return(cheat.Value);
}
// otherwise, compare unpatched value before applying
byte unpatchedValue = oldProcessorReadByte(address);
if (cheat.CompareValue == unpatchedValue)
{
return(cheat.Value);
}
else
{
return(unpatchedValue);
}
};
}
public void Load(string filename)
{
string[] lines = null;
try
{
lines = File.ReadAllLines(filename);
}
catch (Exception exception)
{
MessageBox.Show(
"Unable to load cheat file. Reason: " + exception.Message,
"Load Cheat File", MessageBoxButtons.OK, MessageBoxIcon.Error);
return;
}
cheats.Clear();
foreach (string line in lines)
{
try
{
string trimmedLine = line.Trim();
if (trimmedLine == "" ||
trimmedLine.StartsWith("//") ||
trimmedLine.StartsWith("#"))
{
continue;
}
Cheat cheat = Cheat.Parse(trimmedLine);
cheats[cheat.Address] = cheat;
}
catch (Exception exception)
{
MessageBox.Show(
"Unable to parse line:\r" + line + "\rReason: " + exception.Message,
"Load Cheat File", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}
if (cheats.Count > 0)
{
PatchCheats();
}
}
private void OnCreateCheatMenuItem(object sender, EventArgs eventArgs)
{
if (resultListBox.SelectedIndex < 0)
{
return;
}
Cheat newCheat = new Cheat();
newCheat.Address = Convert.ToUInt16(
resultListBox.SelectedItem.ToString().Substring(0, 4), 16);
CheatDetailsForm cheatDetailsForm = new CheatDetailsForm(newCheat, false);
if (cheatDetailsForm.ShowDialog() == DialogResult.Cancel)
{
return;
}
cheatSystem.AddCheat(newCheat);
}
public bool AddCheat(string gameGenieCode)
{
gameGenieCode = gameGenieCode.Trim().ToUpper();
if (!Cheat.IsValidGameGenieCode(gameGenieCode))
{
MessageBox.Show("Invalid Game Genie code", "Add Game Genie Code", MessageBoxButtons.OK, MessageBoxIcon.Error);
return(false);
}
Cheat gameGenieCheat = Cheat.ParseGameGenieCode(gameGenieCode);
if (cheats.ContainsKey(gameGenieCheat.Address))
{
MessageBox.Show("A cheat is already patched at address: " + Hex.Format(gameGenieCheat.Address), "Add Game Genie Code", MessageBoxButtons.OK, MessageBoxIcon.Error);
return(false);
}
cheats[gameGenieCheat.Address] = gameGenieCheat;
PatchCheats();
return(true);
}
public static Cheat Parse(string line)
{
string[] tokens = line.Split(new char[] { ':' });
if (tokens.Length < 4 || tokens.Length > 5)
{
throw new FormatException(
"Cheat must consist of 4 or 5 elements separated by a semicolom");
}
for (int index = 0; index < tokens.Length; index++)
{
tokens[index] = tokens[index].Trim();
}
Cheat cheat = new Cheat();
string prefix = tokens[0].ToUpper();
if (prefix != "S" && prefix != "SC")
{
throw new FormatException("Unsupported cheat prefix: " + prefix);
}
cheat.NeedsComparison = prefix == "SC";
try
{
ushort address = Convert.ToUInt16(tokens[1], 16);
cheat.Address = address;
}
catch (Exception)
{
throw new FormatException("Invalid address: " + tokens[1]);
}
try
{
byte value = Convert.ToByte(tokens[2], 16);
cheat.Value = value;
}
catch (Exception)
{
throw new FormatException("Invalid cheat value: " + tokens[2]);
}
if (cheat.NeedsComparison)
{
try
{
byte compareValue = Convert.ToByte(tokens[3], 16);
cheat.CompareValue = compareValue;
cheat.Description = tokens[4];
}
catch (Exception)
{
throw new FormatException("Invalid compare value: " + tokens[3]);
}
}
else
{
cheat.Description = tokens[3];
}
return(cheat);
}
