private void AddCrcOnHeader(PacketHeader pHeader)
{
byte[] data = FrameSerializer.BitPacking.GetByteBuffer();
int crcByteLength = CrcCheck.HashSize / 8;
CrcCheck.ComputeHash(data, crcByteLength, data.Length - crcByteLength);
pHeader.Crc = (uint)CrcHelper.FromBigEndian(CrcCheck.Hash, CrcCheck.HashSize);
pHeader.EndSerialize(FrameSerializer);
}
private static void TestCRC()
{
// Sender side
// ============================================================================================
BitPacker bufferSender = new BitPacker();
bufferSender.WriteValue(0x39, 6);
bufferSender.WriteValue(0x2B, 6);
Console.WriteLine("Data envoyées sans CRC :" + bufferSender.ToString());
Parameters parameters = CrcStdParams.StandartParameters[CrcAlgorithms.Crc32];
Crc crcSender = new Crc(parameters);
crcSender.ComputeHash(bufferSender.GetByteBuffer());
uint value = (uint)CrcHelper.FromBigEndian(crcSender.Hash, crcSender.HashSize);
bufferSender.AlignToNextWriteByte();
bufferSender.WriteValue(value, 32);
/*
* Console.WriteLine("Data envoyées avec CRC :" + bufferSender.ToString());
*
* // Trucage des données pour test du CRC
* bufferSender = new BitPacking();
* bufferSender.WriteValue(0x39, BitsRequired(0, 63));
* bufferSender.WriteValue(0x2B, BitsRequired(0, 63));
*
* bufferSender.AlignToNextByte();
* bufferSender.WriteValue(value, (uint)crcSender.HashSize);
* bufferSender.PushTempInBuffer();
* // Console.WriteLine("Valeur du CRC :" + Convert.ToString(value, toBase: 16));
*
* Console.WriteLine("=================================================================");
*/
// Receiver side
// ============================================================================================
BitPacker bufferReceiver = BitPacker.FromArray(bufferSender.GetByteBuffer());
//Console.WriteLine("Réception data avec CRC :" + bufferReceiver.ToString());
Crc crcReceiver = new Crc(parameters);
uint crcValue = bufferReceiver.ReadValue(crcReceiver.HashSize, true, bufferReceiver.BitLength - 32);
Console.WriteLine("Réception data sans CRC :" + bufferReceiver.ToString());
parameters.Check = crcValue;
if (crcReceiver.IsRight(bufferReceiver.GetByteBuffer()))
{
Console.WriteLine("Paquet accepté !");
}
else
{
Console.WriteLine("Refused packet !");
}
}
