private byte[] unpackFrame(int cmdNoCipher, int cmdGlobalCipher, byte[] data)
{
if ((data[0] & 0xFF) == Constants.xDlmsApdu.Exception.ExceptionResponse)
{
DlmsException.DlmsExceptionReason[] reasons = new DlmsException.DlmsExceptionReason[2];
reasons[0] = DlmsException.DlmsExceptionReason.STATE_ERROR_UNKNOWN;
reasons[1] = DlmsException.DlmsExceptionReason.SERVICE_ERROR_UNKNOWN;
if (data[1] == 1)
{
reasons[0] = DlmsException.DlmsExceptionReason.STATE_ERROR_SERVICE_NOT_ALLOWED;
}
else if (data[1] == 2)
{
reasons[0] = DlmsException.DlmsExceptionReason.STATE_ERROR_SERVICE_UNKNOWN;
}
if (data[2] == 1)
{
reasons[1] = DlmsException.DlmsExceptionReason.SERVICE_ERROR_OPERATION_NOT_POSSIBLE;
}
else if (data[2] == 2)
{
reasons[1] = DlmsException.DlmsExceptionReason.SERVICE_ERROR_NOT_SUPPORTED;
}
else if (data[2] == 3)
{
reasons[1] = DlmsException.DlmsExceptionReason.SERVICE_ERROR_OTHER_REASON;
}
throw new DlmsException(reasons);
}
if (parameters.securityType != SecurityType.NONE)
{
if ((data[0] & 0xff) != cmdGlobalCipher)
{
throw new DlmsException(DlmsException.DlmsExceptionReason.RECEIVED_INVALID_COMMAND_ID);
}
data = getPayload(data, 1);
data = Security.reverseAuthenticatedEncryption(parameters, connection, data);
}
if ((data[0] & 0xFF) != cmdNoCipher)
{
throw new DlmsException(DlmsException.DlmsExceptionReason.RECEIVED_INVALID_COMMAND_ID);
}
return(helper.extensions.copyOfRange(data, 1, data.Length));
}
private static void parseUserInfo(byte[] data, CosemParameters parameters, CosemConnection connection)
{
if (data == null || data.Length < 16)
{
throw new DlmsException(DlmsException.DlmsExceptionReason.MALFORMED_AARE_FRAME);
}
if (data[0] != Constants.Ber.OCTET_STRING)
{
throw new DlmsException(DlmsException.DlmsExceptionReason.MALFORMED_AARE_FRAME);
}
if (data[1] < 14 || data[1] != data.Length - 2)
{
throw new DlmsException(DlmsException.DlmsExceptionReason.MALFORMED_AARE_FRAME);
}
if (parameters.securityType != SecurityType.NONE)
{
if (data[2] != Constants.xDlmsApdu.GlobalCiphering.INITIATE_RESPONSE)
{
throw new DlmsException(DlmsException.DlmsExceptionReason.MALFORMED_AARE_FRAME);
}
if (data[3] != data.Length - 4)
{
throw new DlmsException(DlmsException.DlmsExceptionReason.MALFORMED_AARE_FRAME);
}
byte[] encrypted = new byte[data[3] & 0xFF];
Array.Copy(data, 4, encrypted, 0, encrypted.Length);
data = Security.reverseAuthenticatedEncryption(parameters, connection, encrypted);
}
else
{
data = helper.extensions.copyOfRange(data, 2, data.Length);
}
if (data[0] != Constants.xDlmsApdu.NoCiphering.INITIATE_RESPONSE)
{
throw new DlmsException(DlmsException.DlmsExceptionReason.MALFORMED_AARE_FRAME);
}
if (data[1] != 0 || data[2] != Constants.DLMS_VERSION)
{
throw new DlmsException(DlmsException.DlmsExceptionReason.MALFORMED_AARE_FRAME);
}
if (data[3] != Constants.ConformanceBlock.TAG)
{
throw new DlmsException(DlmsException.DlmsExceptionReason.MALFORMED_AARE_FRAME);
}
if (data[4] != 0x1F || data[5] != 0x04 || data[6] != 0x00)
{
throw new DlmsException(DlmsException.DlmsExceptionReason.MALFORMED_AARE_FRAME);
}
connection.conformanceBlock = helper.extensions.copyOfRange(data, 7, 10);
//int vaa = ByteBuffer.allocate(2).put(Arrays.copyOfRange(data, 12, data.Length)).getShort(0);
byte[] aux = helper.extensions.copyOfRange(data, 12, data.Length);
int vaa = BitConverter.ToInt16(new byte[] { (aux[1]), (aux[0]) }, 0);
if (parameters.referenceType == ReferenceType.LOGICAL_NAME && vaa != 0x0007)
{
throw new DlmsException(DlmsException.DlmsExceptionReason.MALFORMED_AARE_FRAME);
}
if (parameters.referenceType == ReferenceType.SHORT_NAME && vaa != 0xFA00)
{
throw new DlmsException(DlmsException.DlmsExceptionReason.MALFORMED_AARE_FRAME);
}
connection.maxPduSize = ((data[10] & 0xFF) << 8) | (data[11] & 0xFF);
}