private void ReceiveCRC32(byte data)
{
if (_receivedDataCounter == 0)
{
_logger.Log($"Receiving CRC32...", LoggingLevel.Debug);
_receiverDataIndex = 0;
_receivedCRC32 = 0;
}
_receivedCRC32 = (_receivedCRC32 << 8) + data;
_receiverDataIndex++;
Console.Write($"\rReceived [{_receiverDataIndex} / 4] CRC32 bytes");
if (_receiverDataIndex == 4)
{
Console.WriteLine();
var calculatedCRC32 = CRC32.CalculateCRC32(_receiverDataBuffer);
if (calculatedCRC32 == _receivedCRC32)
{
_logger.Log($"CRC32 match. Local:{calculatedCRC32} Remote:{_receivedCRC32}", LoggingLevel.Debug);
_serialPort.BaseStream.WriteByte(Flags.CRC32Match);
_localDisk.WriteSectors(_receiverDataBuffer.Length, (int)_receivedSectorIndex, _receiverDataBuffer);
_state = ReceiverState.ReceiveStartMagic;
}
else
{
_logger.Log($"CRC32 mismatch. Local:{calculatedCRC32} Remote:{_receivedCRC32}", LoggingLevel.Debug);
_serialPort.BaseStream.WriteByte(Flags.CRC32Mismatch);
_state = ReceiverState.ReceiveData;
}
_receivedDataCounter = -1;
_logger.Log($"Receiver state: {_state}", LoggingLevel.Debug);
}
}
private void SendData()
{
_logger.Log("Sending data...", LoggingLevel.Info);
if (_receivedSectorCount == 1)
{
_logger.Log("Reading sector " + _receivedSectorIndex, LoggingLevel.Debug);
}
else
{
_logger.Log("Reading sectors " + _receivedSectorIndex + " - " + (_receivedSectorIndex + _receivedSectorCount - 1), LoggingLevel.Debug);
}
byte[] sendDataBuffer = _localDisk.ReadSectors(Convert.ToInt32(_receivedSectorIndex), Convert.ToInt32(_receivedSectorCount));
UInt32 crc32Checksum = CRC32.CalculateCRC32(sendDataBuffer);
SerialFlags serialFlags = SerialFlags.None;
if (_compressionIsEnabled)
{
serialFlags |= SerialFlags.Compression;
}
_logger.Log($"Sending serial flags: {serialFlags}...", LoggingLevel.Debug);
_serialPort.BaseStream.WriteByte(Convert.ToByte(serialFlags));
var numUncompressedBytes = sendDataBuffer.Length;
string sendingMessage = $"Sending {numUncompressedBytes} bytes";
if (serialFlags.HasFlag(SerialFlags.Compression))
{
sendDataBuffer = Utilities.LZ4.CompressAsStandardLZ4Block(sendDataBuffer);
sendingMessage = $"Sending {sendDataBuffer.Length} bytes";
_transferStartDateTime = DateTime.Now;
byte[] dataLenBuffer = new byte[4];
dataLenBuffer[0] = (byte)((sendDataBuffer.Length >> 24) & 0xff);
dataLenBuffer[1] = (byte)((sendDataBuffer.Length >> 16) & 0xff);
dataLenBuffer[2] = (byte)((sendDataBuffer.Length >> 8) & 0xff);
dataLenBuffer[3] = (byte)(sendDataBuffer.Length & 0xff);
float percentageOfOriginalSize = (100 / (float)numUncompressedBytes) * sendDataBuffer.Length;
_logger.Log($"Compression: { percentageOfOriginalSize.ToString("00.00")}% of { numUncompressedBytes} bytes", LoggingLevel.Debug);
_serialPort.BaseStream.Write(dataLenBuffer, 0, dataLenBuffer.Length);
}
_logger.Log(sendingMessage, LoggingLevel.Info);
for (int i = 0; i < sendDataBuffer.Length; i++)
{
_serialPort.BaseStream.WriteByte(sendDataBuffer[i]);
string percentSent = ((Convert.ToDecimal(i + 1) / sendDataBuffer.Length) * 100).ToString("00.00");
Console.Write($"\rSent [{(i + 1).ToString("D" + sendDataBuffer.Length.ToString().Length)} / {sendDataBuffer.Length} Bytes] {percentSent}% ");
}
Console.WriteLine();
byte[] crc32Buffer = new byte[4];
crc32Buffer[0] = (byte)((crc32Checksum >> 24) & 0xff);
crc32Buffer[1] = (byte)((crc32Checksum >> 16) & 0xff);
crc32Buffer[2] = (byte)((crc32Checksum >> 8) & 0xff);
crc32Buffer[3] = (byte)(crc32Checksum & 0xff);
_logger.Log("Sending CRC32...", LoggingLevel.Debug);
_serialPort.BaseStream.Write(crc32Buffer, 0, crc32Buffer.Length);
_state = ReceiverState.ReceiveStartMagic;
_logger.Log($"Receiver state: {_state}", LoggingLevel.Debug);
}
public void CalculateCRC32ForBytes(byte[] dataBytes, uint expectedCrc32Checksum)
{
Assert.AreEqual(expectedCrc32Checksum, CRC32.CalculateCRC32(dataBytes));
}
public void CalculateCRC32ForString(string dataString, uint expectedCrc32Checksum)
{
byte[] dataBytes = Encoding.ASCII.GetBytes(dataString);
Assert.AreEqual(expectedCrc32Checksum, CRC32.CalculateCRC32(dataBytes));
}
public void CalculateCRC32ForLargeSector()
{
uint crc32 = CRC32.CalculateCRC32(Enumerable.Repeat((byte)0xFF, 0x2000).ToArray());
Assert.AreEqual(0x7A4A44C9, crc32);
}