private bool readLoadPoint(WaveSeeker waveSeeker)
{
// Read load point
if ((tapFile.fileType == '9') || (tapFile.fileType == 'M'))
{
tapFile.loadPoint = waveSeeker.readUShort();
infoTextBox.AppendText("Load Point: " + "0x" + tapFile.loadPoint.ToString("X4") + Environment.NewLine);
}
return(true);
}
private bool readProgramLength(WaveSeeker waveSeeker)
{
// Read program length
tapFile.programLength = waveSeeker.readUShort();
if (tapFile.programLength == 0)
{
infoTextBox.AppendText("Warning: Program Length not found." + Environment.NewLine);
}
else
{
infoTextBox.AppendText("Program Length: " + tapFile.programLength + Environment.NewLine);
}
return(true);
}
private void ReloadButton_Click(object sender, EventArgs e)
{
if (!validateWavFilename())
{
return;
}
Application.DoEvents();
using (NAudio.Wave.WaveFileReader waveFile = new NAudio.Wave.WaveFileReader(wavFilenameTextBox.Text))
{
tapFile = new TapFile();
WaveSeeker waveSeeker = new WaveSeeker(waveFile);
// Read Header Information
if (!readHeaderInfo(waveSeeker))
{
return;
}
// If we don't know the program length
if (tapFile.programLength == 0)
{
return;
}
// Read program itself
if (!readProgramBytes(waveSeeker))
{
return;
}
// Display program bytes
displayProgramBytes();
// Validate Basic terminator
if ((tapFile.fileType == 'B') && (tapFile.program[tapFile.programLength - 1] != 0x80))
{
infoTextBox.AppendText("Warning: 'End-of-program' terminator missing (&80)" + Environment.NewLine);
}
// Actual length
infoTextBox.AppendText(Environment.NewLine + "Length: " + tapFile.programLength + " (agreed)" + Environment.NewLine);
infoTextBox.AppendText(Environment.NewLine + "Trailing Information:" + Environment.NewLine + "---------------------" + Environment.NewLine);
// Read checksum
if ((tapFile.fileType == 'M') || (tapFile.fileType == 'D') || (tapFile.fileType == '9'))
{
if (!waveSeeker.readChecksum(out tapFile.checksum))
{
infoTextBox.AppendText("Warning: Checksum wrong/not found (ignored)" + Environment.NewLine);
}
infoTextBox.AppendText("Checksum: " + tapFile.checksum.ToString("X2") + Environment.NewLine);
// Calculate actual checksum
byte actualChecksum = 0;
for (int i = 0; i < tapFile.program.Length; i++)
{
actualChecksum += tapFile.program[i];
}
infoTextBox.AppendText("Calculated Checksum: " + actualChecksum.ToString("X2"));
if (tapFile.checksum == actualChecksum)
{
infoTextBox.AppendText(" (agreed)" + Environment.NewLine);
}
else
{
infoTextBox.AppendText(Environment.NewLine + "Warning: checksums disagree (ignored)" + Environment.NewLine);
}
tapFile.checksum = actualChecksum;
if ((tapFile.fileType == 'M') || (tapFile.fileType == 'D'))
{
waveSeeker.readByte(out tapFile.mysteryByte);
infoTextBox.AppendText("Mystery byte: " + tapFile.mysteryByte.ToString("X2") + Environment.NewLine);
}
}
// Read excution point
if (tapFile.fileType != '9' && tapFile.fileType != 'D')
{
tapFile.executionPoint = waveSeeker.readUShort();
infoTextBox.AppendText("Execution point: 0x" + tapFile.executionPoint.ToString("X4") + Environment.NewLine);
}
// Scroll to top
infoTextBox.SelectionStart = 0;
infoTextBox.SelectionLength = 1;
infoTextBox.ScrollToCaret();
// Now enable Tap controls.
saveButton.Enabled = isSaveEnabled();
}
}
