// Read/assemble the next byte
internal bool readByte(out byte result)
{
int theByte = 0;
result = 0;
if (this.EndOfFile)
{
return(false);
}
for (int i = 0; i < 8; i++)
{
//seek next wave
this.WavePositions = this.seekWave();
if ((this.WavePositions.max == -1) || this.EndOfFile)
{
return(false);
}
else
{
// build the byte based on wave "type"
theByte = theByte | (this.whatIsBit() << (7 - i));
}
}
result = (byte)theByte;
return(true);
}
// Search for the A5 byte -> Binary(10100101)
internal bool seekA5Byte()
{
int theByte;
// Skip past the "zero waves", until reaching a "one wave"
do
{
this.WavePositions = this.seekWave();
}while
((this.whatIsBit() == 0) && !this.EndOfFile);
if (this.EndOfFile)
{
return(false);
}
theByte = 0;
for (int i = 0; i < 8; i++)
{
// Find the next "wave"
if (i != 0)
{
this.WavePositions = this.seekWave();
}
// build the byte based on wave "type"
theByte = theByte | (this.whatIsBit() << (7 - i));
}
//Binary(10100101)
return(theByte == 0xA5);
}
internal WavePositionsStruct findSyncZero()
{
do
{
this.WavePositions = this.seekWave();
}while
((this.whatIsBit() == 1) && !this.EndOfFile);
// Statistics
this.zeroWaveStart = this.WavePositions.start;
// TODO: what if it's not a zero sync wave? Keep searching? iterate to end of file
return(this.WavePositions);
}
// Searches for one wavelength beginning, minimum, crossover, maximum
// (ignore end position, because that's the next start position)
internal WavePositionsStruct seekWave()
{
WavePositionsStruct falseResult = new WavePositionsStruct(-1, -1, -1, -1);
WavePositionsStruct result = new WavePositionsStruct(0, 0, 0, 0);
int position = -1;
if ((position = this.seekCrossunder()) == -1)
{
return(falseResult);
}
else
{
result.start = position;
}
if ((position = this.seekMin()) == -1)
{
return(falseResult);
}
else
{
result.min = position;
}
if ((position = this.seekCrossover()) == -1)
{
return(falseResult);
}
else
{
result.crossover = position;
}
if ((position = this.seekMax()) == -1)
{
return(falseResult);
}
else
{
result.max = position;
}
return(result);
}
private bool findSyncZero(WaveSeeker waveSeeker)
{
WavePositionsStruct wavePositions = waveSeeker.findSyncZero();
if (waveSeeker.EndOfFile)
{
infoTextBox.AppendText("Failed: Sync zero not found. End of File." + Environment.NewLine);
return(false);
}
infoTextBox.AppendText(
"Sync zero found. " +
"(" + wavePositions.start +
"," + wavePositions.min +
"," + wavePositions.crossover +
"," + wavePositions.max + ")" + Environment.NewLine
);
return(true);
}
