#9 add interleave data tests, fix lenght calculation

F4FXL · Jan 13, 2022 · eee1c22 · eee1c22
1 parent 30e4893
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diff --git a/SlowDataEncoder.cpp b/SlowDataEncoder.cpp
@@ -190,7 +190,7 @@ unsigned int CSlowDataEncoder::getInterleavedDataLength()
 	m_interleavedDataFullSize = 0U;
 	if(m_textData) m_interleavedDataFullSize += TEXT_SIZE;
 	if(m_headerData) m_interleavedDataFullSize += SLOW_DATA_BLOCK_SIZE;
-	if(m_gpsData) m_interleavedDataFullSize += m_gpsDataFullSize;
+	if(m_gpsData) m_interleavedDataFullSize += m_gpsDataSize;
 	m_interleavedDataFullSize = roundUpToMultipleOf(m_interleavedDataFullSize, SLOW_DATA_FULL_BLOCK_SIZE); //SLOW_DATA_FULL_BLOCK_SIZE * (1U + ((m_interleavedDataFullSize - 1U) / SLOW_DATA_FULL_BLOCK_SIZE));
 	return m_interleavedDataFullSize;
 }

diff --git a/Tests/SlowDataEncoder/InterleavedData.cpp b/Tests/SlowDataEncoder/InterleavedData.cpp
@@ -0,0 +1,354 @@
+/*
+ *   Copyright (C) 2021-2022 by Geoffrey Merck F4FXL / KC3FRA
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <gtest/gtest.h>
+
+#include "../../SlowDataEncoder.h"
+#include "../../DStarDefines.h"
+
+namespace SlowDataEncoderTests
+{
+    class SlowDataEncoder_interleavedData : public ::testing::Test {
+
+    };
+
+    TEST_F(SlowDataEncoder_interleavedData, gpsAndTextData)
+    {
+        //here we only test for correct interleaving
+        CSlowDataEncoder encoder;
+        encoder.setTextData("TTTTTT"); // 6 times T
+        encoder.setGPSData("GGGGGGGGGGGGGGGGGGGGGG"); // 22 times G
+
+        auto dataLen = encoder.getInterleavedDataLength();
+
+        EXPECT_EQ(dataLen, 60);// including data type bytes we need 54 (20 + 5 + 22 + 6) bytes, this shall be rounded up to next block size multiple, in this case 60
+
+        for(unsigned int testCount = 0U; testCount < 2U; testCount++) {
+            unsigned char buffer[6U];
+
+            encoder.getInterleavedData(buffer);
+            encoder.getInterleavedData(buffer + 3);
+            EXPECT_EQ(buffer[0] ^ SCRAMBLER_BYTE1, SLOW_DATA_TYPE_TEXT | 0x0U);
+            EXPECT_EQ(buffer[1] ^ SCRAMBLER_BYTE2, 'T');
+            EXPECT_EQ(buffer[2] ^ SCRAMBLER_BYTE3, 'T');
+            EXPECT_EQ(buffer[3] ^ SCRAMBLER_BYTE1, 'T');
+            EXPECT_EQ(buffer[4] ^ SCRAMBLER_BYTE2, 'T');
+            EXPECT_EQ(buffer[5] ^ SCRAMBLER_BYTE3, 'T');
+
+            encoder.getInterleavedData(buffer);
+            encoder.getInterleavedData(buffer + 3);
+            EXPECT_EQ(buffer[0] ^ SCRAMBLER_BYTE1, SLOW_DATA_TYPE_GPS | 0x5U);
+            EXPECT_EQ(buffer[1] ^ SCRAMBLER_BYTE2, 'G');
+            EXPECT_EQ(buffer[2] ^ SCRAMBLER_BYTE3, 'G');
+            EXPECT_EQ(buffer[3] ^ SCRAMBLER_BYTE1, 'G');
+            EXPECT_EQ(buffer[4] ^ SCRAMBLER_BYTE2, 'G');
+            EXPECT_EQ(buffer[5] ^ SCRAMBLER_BYTE3, 'G');
+
+            encoder.getInterleavedData(buffer);
+            encoder.getInterleavedData(buffer + 3);
+            EXPECT_EQ(buffer[0] ^ SCRAMBLER_BYTE1, SLOW_DATA_TYPE_TEXT | 0x1U);
+            EXPECT_EQ(buffer[1] ^ SCRAMBLER_BYTE2, 'T');
+            EXPECT_EQ(buffer[2] ^ SCRAMBLER_BYTE3, ' ');
+            EXPECT_EQ(buffer[3] ^ SCRAMBLER_BYTE1, ' ');
+            EXPECT_EQ(buffer[4] ^ SCRAMBLER_BYTE2, ' ');
+            EXPECT_EQ(buffer[5] ^ SCRAMBLER_BYTE3, ' ');
+
+            encoder.getInterleavedData(buffer);
+            encoder.getInterleavedData(buffer + 3);
+            EXPECT_EQ(buffer[0] ^ SCRAMBLER_BYTE1, SLOW_DATA_TYPE_GPS | 0x5U);
+            EXPECT_EQ(buffer[1] ^ SCRAMBLER_BYTE2, 'G');
+            EXPECT_EQ(buffer[2] ^ SCRAMBLER_BYTE3, 'G');
+            EXPECT_EQ(buffer[3] ^ SCRAMBLER_BYTE1, 'G');
+            EXPECT_EQ(buffer[4] ^ SCRAMBLER_BYTE2, 'G');
+            EXPECT_EQ(buffer[5] ^ SCRAMBLER_BYTE3, 'G');
+
+            encoder.getInterleavedData(buffer);
+            encoder.getInterleavedData(buffer + 3);
+            EXPECT_EQ(buffer[0] ^ SCRAMBLER_BYTE1, SLOW_DATA_TYPE_TEXT | 0x2U);
+            EXPECT_EQ(buffer[1] ^ SCRAMBLER_BYTE2, ' ');
+            EXPECT_EQ(buffer[2] ^ SCRAMBLER_BYTE3, ' ');
+            EXPECT_EQ(buffer[3] ^ SCRAMBLER_BYTE1, ' ');
+            EXPECT_EQ(buffer[4] ^ SCRAMBLER_BYTE2, ' ');
+            EXPECT_EQ(buffer[5] ^ SCRAMBLER_BYTE3, ' ');
+
+            encoder.getInterleavedData(buffer);
+            encoder.getInterleavedData(buffer + 3);
+            EXPECT_EQ(buffer[0] ^ SCRAMBLER_BYTE1, SLOW_DATA_TYPE_GPS | 0x5U);
+            EXPECT_EQ(buffer[1] ^ SCRAMBLER_BYTE2, 'G');
+            EXPECT_EQ(buffer[2] ^ SCRAMBLER_BYTE3, 'G');
+            EXPECT_EQ(buffer[3] ^ SCRAMBLER_BYTE1, 'G');
+            EXPECT_EQ(buffer[4] ^ SCRAMBLER_BYTE2, 'G');
+            EXPECT_EQ(buffer[5] ^ SCRAMBLER_BYTE3, 'G');
+
+            encoder.getInterleavedData(buffer);
+            encoder.getInterleavedData(buffer + 3);
+            EXPECT_EQ(buffer[0] ^ SCRAMBLER_BYTE1, SLOW_DATA_TYPE_TEXT | 0x3U);
+            EXPECT_EQ(buffer[1] ^ SCRAMBLER_BYTE2, ' ');
+            EXPECT_EQ(buffer[2] ^ SCRAMBLER_BYTE3, ' ');
+            EXPECT_EQ(buffer[3] ^ SCRAMBLER_BYTE1, ' ');
+            EXPECT_EQ(buffer[4] ^ SCRAMBLER_BYTE2, ' ');
+            EXPECT_EQ(buffer[5] ^ SCRAMBLER_BYTE3, ' ');
+
+            encoder.getInterleavedData(buffer);
+            encoder.getInterleavedData(buffer + 3);
+            EXPECT_EQ(buffer[0] ^ SCRAMBLER_BYTE1, SLOW_DATA_TYPE_GPS | 0x5U);
+            EXPECT_EQ(buffer[1] ^ SCRAMBLER_BYTE2, 'G');
+            EXPECT_EQ(buffer[2] ^ SCRAMBLER_BYTE3, 'G');
+            EXPECT_EQ(buffer[3] ^ SCRAMBLER_BYTE1, 'G');
+            EXPECT_EQ(buffer[4] ^ SCRAMBLER_BYTE2, 'G');
+            EXPECT_EQ(buffer[5] ^ SCRAMBLER_BYTE3, 'G');
+
+
+            encoder.getInterleavedData(buffer);
+            encoder.getInterleavedData(buffer + 3);
+            EXPECT_EQ(buffer[0] ^ SCRAMBLER_BYTE1, SLOW_DATA_TYPE_GPS | 0x2U);
+            EXPECT_EQ(buffer[1] ^ SCRAMBLER_BYTE2, 'G');
+            EXPECT_EQ(buffer[2] ^ SCRAMBLER_BYTE3, 'G');
+            EXPECT_EQ(buffer[3] ^ SCRAMBLER_BYTE1, 'f');
+            EXPECT_EQ(buffer[4] ^ SCRAMBLER_BYTE2, 'f');
+            EXPECT_EQ(buffer[5] ^ SCRAMBLER_BYTE3, 'f');
+
+            //remaining shall only be 'f"
+            encoder.getInterleavedData(buffer);
+            encoder.getInterleavedData(buffer + 3);
+            EXPECT_EQ(buffer[0] ^ SCRAMBLER_BYTE1, 'f');
+            EXPECT_EQ(buffer[1] ^ SCRAMBLER_BYTE2, 'f');
+            EXPECT_EQ(buffer[2] ^ SCRAMBLER_BYTE3, 'f');
+            EXPECT_EQ(buffer[3] ^ SCRAMBLER_BYTE1, 'f');
+            EXPECT_EQ(buffer[4] ^ SCRAMBLER_BYTE2, 'f');
+            EXPECT_EQ(buffer[5] ^ SCRAMBLER_BYTE3, 'f');
+        }
+    }
+
+    TEST_F(SlowDataEncoder_interleavedData, onlyGPSData)
+    {
+        CSlowDataEncoder encoder;
+        encoder.setGPSData("ABCDEFGHIJKLMN");
+
+        for(unsigned int testCount = 0U; testCount < 2U; testCount++) {
+            unsigned char buffer[6U];
+
+            encoder.getInterleavedData(buffer);
+            encoder.getInterleavedData(buffer + 3);
+            EXPECT_EQ(buffer[0] ^ SCRAMBLER_BYTE1, SLOW_DATA_TYPE_GPS | 0x5U);
+            EXPECT_EQ(buffer[1] ^ SCRAMBLER_BYTE2, 'A');
+            EXPECT_EQ(buffer[2] ^ SCRAMBLER_BYTE3, 'B');
+            EXPECT_EQ(buffer[3] ^ SCRAMBLER_BYTE1, 'C');
+            EXPECT_EQ(buffer[4] ^ SCRAMBLER_BYTE2, 'D');
+            EXPECT_EQ(buffer[5] ^ SCRAMBLER_BYTE3, 'E');
+
+            encoder.getInterleavedData(buffer);
+            encoder.getInterleavedData(buffer + 3);
+            EXPECT_EQ(buffer[0] ^ SCRAMBLER_BYTE1, SLOW_DATA_TYPE_GPS | 0x5U);
+            EXPECT_EQ(buffer[1] ^ SCRAMBLER_BYTE2, 'F');
+            EXPECT_EQ(buffer[2] ^ SCRAMBLER_BYTE3, 'G');
+            EXPECT_EQ(buffer[3] ^ SCRAMBLER_BYTE1, 'H');
+            EXPECT_EQ(buffer[4] ^ SCRAMBLER_BYTE2, 'I');
+            EXPECT_EQ(buffer[5] ^ SCRAMBLER_BYTE3, 'J');
+
+            encoder.getInterleavedData(buffer);
+            encoder.getInterleavedData(buffer + 3);
+            EXPECT_EQ(buffer[0] ^ SCRAMBLER_BYTE1, SLOW_DATA_TYPE_GPS | 0x4U);
+            EXPECT_EQ(buffer[1] ^ SCRAMBLER_BYTE2, 'K');
+            EXPECT_EQ(buffer[2] ^ SCRAMBLER_BYTE3, 'L');
+            EXPECT_EQ(buffer[3] ^ SCRAMBLER_BYTE1, 'M');
+            EXPECT_EQ(buffer[4] ^ SCRAMBLER_BYTE2, 'N');
+            EXPECT_EQ(buffer[5] ^ SCRAMBLER_BYTE3, 'f');
+
+            // all the remaining data shall be filled with 'f'
+            for(unsigned int i = 18; i < 60U; i+= 6U) {
+                encoder.getInterleavedData(buffer);
+                encoder.getInterleavedData(buffer + 3);
+                EXPECT_EQ(buffer[0] ^ SCRAMBLER_BYTE1, 'f');
+                EXPECT_EQ(buffer[1] ^ SCRAMBLER_BYTE2, 'f');
+                EXPECT_EQ(buffer[2] ^ SCRAMBLER_BYTE3, 'f');
+                EXPECT_EQ(buffer[3] ^ SCRAMBLER_BYTE1, 'f');
+                EXPECT_EQ(buffer[4] ^ SCRAMBLER_BYTE2, 'f');
+                EXPECT_EQ(buffer[5] ^ SCRAMBLER_BYTE3, 'f');
+            }
+        }
+    }
+
+    TEST_F(SlowDataEncoder_interleavedData, onlyTextData)
+    {
+        CSlowDataEncoder encoder;
+        encoder.setTextData("ABCDEFG");
+
+        for(unsigned int testCount = 0U; testCount < 2U; testCount++) {
+            unsigned char buffer[6U];
+
+            encoder.getInterleavedData(buffer);
+            encoder.getInterleavedData(buffer + 3);
+            EXPECT_EQ(buffer[0] ^ SCRAMBLER_BYTE1, SLOW_DATA_TYPE_TEXT | 0x0U);
+            EXPECT_EQ(buffer[1] ^ SCRAMBLER_BYTE2, 'A');
+            EXPECT_EQ(buffer[2] ^ SCRAMBLER_BYTE3, 'B');
+            EXPECT_EQ(buffer[3] ^ SCRAMBLER_BYTE1, 'C');
+            EXPECT_EQ(buffer[4] ^ SCRAMBLER_BYTE2, 'D');
+            EXPECT_EQ(buffer[5] ^ SCRAMBLER_BYTE3, 'E');
+
+            encoder.getInterleavedData(buffer);
+            encoder.getInterleavedData(buffer + 3);
+            EXPECT_EQ(buffer[0] ^ SCRAMBLER_BYTE1, SLOW_DATA_TYPE_TEXT | 0x1U);
+            EXPECT_EQ(buffer[1] ^ SCRAMBLER_BYTE2, 'F');
+            EXPECT_EQ(buffer[2] ^ SCRAMBLER_BYTE3, 'G');
+            EXPECT_EQ(buffer[3] ^ SCRAMBLER_BYTE1, ' ');
+            EXPECT_EQ(buffer[4] ^ SCRAMBLER_BYTE2, ' ');
+            EXPECT_EQ(buffer[5] ^ SCRAMBLER_BYTE3, ' ');
+
+            encoder.getInterleavedData(buffer);
+            encoder.getInterleavedData(buffer + 3);
+            EXPECT_EQ(buffer[0] ^ SCRAMBLER_BYTE1, SLOW_DATA_TYPE_TEXT | 0x2U);
+            EXPECT_EQ(buffer[1] ^ SCRAMBLER_BYTE2, ' ');
+            EXPECT_EQ(buffer[2] ^ SCRAMBLER_BYTE3, ' ');
+            EXPECT_EQ(buffer[3] ^ SCRAMBLER_BYTE1, ' ');
+            EXPECT_EQ(buffer[4] ^ SCRAMBLER_BYTE2, ' ');
+            EXPECT_EQ(buffer[5] ^ SCRAMBLER_BYTE3, ' ');
+
+            encoder.getInterleavedData(buffer);
+            encoder.getInterleavedData(buffer + 3);
+            EXPECT_EQ(buffer[0] ^ SCRAMBLER_BYTE1, SLOW_DATA_TYPE_TEXT | 0x3U);
+            EXPECT_EQ(buffer[1] ^ SCRAMBLER_BYTE2, ' ');
+            EXPECT_EQ(buffer[2] ^ SCRAMBLER_BYTE3, ' ');
+            EXPECT_EQ(buffer[3] ^ SCRAMBLER_BYTE1, ' ');
+            EXPECT_EQ(buffer[4] ^ SCRAMBLER_BYTE2, ' ');
+            EXPECT_EQ(buffer[5] ^ SCRAMBLER_BYTE3, ' ');
+
+            // all the remaining data shall be filled with 'f'
+            for(unsigned int i = 24; i < 60U; i+= 6U) {
+                encoder.getInterleavedData(buffer);
+                encoder.getInterleavedData(buffer + 3);
+                EXPECT_EQ(buffer[0] ^ SCRAMBLER_BYTE1, 'f');
+                EXPECT_EQ(buffer[1] ^ SCRAMBLER_BYTE2, 'f');
+                EXPECT_EQ(buffer[2] ^ SCRAMBLER_BYTE3, 'f');
+                EXPECT_EQ(buffer[3] ^ SCRAMBLER_BYTE1, 'f');
+                EXPECT_EQ(buffer[4] ^ SCRAMBLER_BYTE2, 'f');
+                EXPECT_EQ(buffer[5] ^ SCRAMBLER_BYTE3, 'f');
+            }
+        }
+    }
+
+    TEST_F(SlowDataEncoder_interleavedData, onlyHeaderData)
+    {
+        CHeaderData header;
+        header.setFlags('1', '2', '3');
+        header.setMyCall1("F4FXL");
+        header.setMyCall2("5100");
+        header.setYourCall("CQCQCQ");
+        header.setRptCall1("F5ZEE  B");
+        header.setRptCall2("F5ZEE  G");
+
+        CSlowDataEncoder encoder;
+        encoder.setHeaderData(header);
+
+        for(unsigned int testCount = 0U; testCount < 2U; testCount++) {
+            unsigned char buffer[6U];
+
+            encoder.getInterleavedData(buffer);
+            encoder.getInterleavedData(buffer + 3);
+            EXPECT_EQ(buffer[0] ^ SCRAMBLER_BYTE1, SLOW_DATA_TYPE_HEADER | 0x5U);
+            EXPECT_EQ(buffer[1] ^ SCRAMBLER_BYTE2, '1');
+            EXPECT_EQ(buffer[2] ^ SCRAMBLER_BYTE3, '2');
+            EXPECT_EQ(buffer[3] ^ SCRAMBLER_BYTE1, '3');
+            EXPECT_EQ(buffer[4] ^ SCRAMBLER_BYTE2, 'F');
+            EXPECT_EQ(buffer[5] ^ SCRAMBLER_BYTE3, '5');
+
+            encoder.getInterleavedData(buffer);
+            encoder.getInterleavedData(buffer + 3);
+            EXPECT_EQ(buffer[0] ^ SCRAMBLER_BYTE1, SLOW_DATA_TYPE_HEADER | 0x5U);
+            EXPECT_EQ(buffer[1] ^ SCRAMBLER_BYTE2, 'Z');
+            EXPECT_EQ(buffer[2] ^ SCRAMBLER_BYTE3, 'E');
+            EXPECT_EQ(buffer[3] ^ SCRAMBLER_BYTE1, 'E');
+            EXPECT_EQ(buffer[4] ^ SCRAMBLER_BYTE2, ' ');
+            EXPECT_EQ(buffer[5] ^ SCRAMBLER_BYTE3, ' ');
+
+            encoder.getInterleavedData(buffer);
+            encoder.getInterleavedData(buffer + 3);
+            EXPECT_EQ(buffer[0] ^ SCRAMBLER_BYTE1, SLOW_DATA_TYPE_HEADER | 0x5U);
+            EXPECT_EQ(buffer[1] ^ SCRAMBLER_BYTE2, 'G');
+            EXPECT_EQ(buffer[2] ^ SCRAMBLER_BYTE3, 'F');
+            EXPECT_EQ(buffer[3] ^ SCRAMBLER_BYTE1, '5');
+            EXPECT_EQ(buffer[4] ^ SCRAMBLER_BYTE2, 'Z');
+            EXPECT_EQ(buffer[5] ^ SCRAMBLER_BYTE3, 'E');
+
+            encoder.getInterleavedData(buffer);
+            encoder.getInterleavedData(buffer + 3);
+            EXPECT_EQ(buffer[0] ^ SCRAMBLER_BYTE1, SLOW_DATA_TYPE_HEADER | 0x5U);
+            EXPECT_EQ(buffer[1] ^ SCRAMBLER_BYTE2, 'E');
+            EXPECT_EQ(buffer[2] ^ SCRAMBLER_BYTE3, ' ');
+            EXPECT_EQ(buffer[3] ^ SCRAMBLER_BYTE1, ' ');
+            EXPECT_EQ(buffer[4] ^ SCRAMBLER_BYTE2, 'B');
+            EXPECT_EQ(buffer[5] ^ SCRAMBLER_BYTE3, 'C');
+
+            encoder.getInterleavedData(buffer);
+            encoder.getInterleavedData(buffer + 3);
+            EXPECT_EQ(buffer[0] ^ SCRAMBLER_BYTE1, SLOW_DATA_TYPE_HEADER | 0x5U);
+            EXPECT_EQ(buffer[1] ^ SCRAMBLER_BYTE2, 'Q');
+            EXPECT_EQ(buffer[2] ^ SCRAMBLER_BYTE3, 'C');
+            EXPECT_EQ(buffer[3] ^ SCRAMBLER_BYTE1, 'Q');
+            EXPECT_EQ(buffer[4] ^ SCRAMBLER_BYTE2, 'C');
+            EXPECT_EQ(buffer[5] ^ SCRAMBLER_BYTE3, 'Q');
+
+            encoder.getInterleavedData(buffer);
+            encoder.getInterleavedData(buffer + 3);
+            EXPECT_EQ(buffer[0] ^ SCRAMBLER_BYTE1, SLOW_DATA_TYPE_HEADER | 0x5U);
+            EXPECT_EQ(buffer[1] ^ SCRAMBLER_BYTE2, ' ');
+            EXPECT_EQ(buffer[2] ^ SCRAMBLER_BYTE3, ' ');
+            EXPECT_EQ(buffer[3] ^ SCRAMBLER_BYTE1, 'F');
+            EXPECT_EQ(buffer[4] ^ SCRAMBLER_BYTE2, '4');
+            EXPECT_EQ(buffer[5] ^ SCRAMBLER_BYTE3, 'F');
+
+            encoder.getInterleavedData(buffer);
+            encoder.getInterleavedData(buffer + 3);
+            EXPECT_EQ(buffer[0] ^ SCRAMBLER_BYTE1, SLOW_DATA_TYPE_HEADER | 0x5U);
+            EXPECT_EQ(buffer[1] ^ SCRAMBLER_BYTE2, 'X');
+            EXPECT_EQ(buffer[2] ^ SCRAMBLER_BYTE3, 'L');
+            EXPECT_EQ(buffer[3] ^ SCRAMBLER_BYTE1, ' ');
+            EXPECT_EQ(buffer[4] ^ SCRAMBLER_BYTE2, ' ');
+            EXPECT_EQ(buffer[5] ^ SCRAMBLER_BYTE3, ' ');
+
+            encoder.getInterleavedData(buffer);
+            encoder.getInterleavedData(buffer + 3);
+            EXPECT_EQ(buffer[0] ^ SCRAMBLER_BYTE1, SLOW_DATA_TYPE_HEADER | 0x5U);
+            EXPECT_EQ(buffer[1] ^ SCRAMBLER_BYTE2, '5');
+            EXPECT_EQ(buffer[2] ^ SCRAMBLER_BYTE3, '1');
+            EXPECT_EQ(buffer[3] ^ SCRAMBLER_BYTE1, '0');
+            EXPECT_EQ(buffer[4] ^ SCRAMBLER_BYTE2, '0');
+            EXPECT_NE(buffer[5] ^ SCRAMBLER_BYTE3, 'f'); // we do not check the actual result of the CRC, we just make sure is inot 'f'
+
+            encoder.getInterleavedData(buffer);
+            encoder.getInterleavedData(buffer + 3);
+            EXPECT_EQ(buffer[0] ^ SCRAMBLER_BYTE1, SLOW_DATA_TYPE_HEADER | 0x1U);
+            EXPECT_NE(buffer[1] ^ SCRAMBLER_BYTE2, 'f'); // done with crc check, remaining shall be filled with 'f'
+
+            EXPECT_EQ(buffer[2] ^ SCRAMBLER_BYTE3, 'f');
+            EXPECT_EQ(buffer[3] ^ SCRAMBLER_BYTE1, 'f');
+            EXPECT_EQ(buffer[4] ^ SCRAMBLER_BYTE2, 'f');
+            EXPECT_EQ(buffer[5] ^ SCRAMBLER_BYTE3, 'f');
+
+            encoder.getInterleavedData(buffer);
+            encoder.getInterleavedData(buffer + 3);
+            // all the remaining data shall be filled with 'f'
+            EXPECT_EQ(buffer[0] ^ SCRAMBLER_BYTE1, 'f');
+            EXPECT_EQ(buffer[1] ^ SCRAMBLER_BYTE2, 'f');
+            EXPECT_EQ(buffer[2] ^ SCRAMBLER_BYTE3, 'f');
+            EXPECT_EQ(buffer[3] ^ SCRAMBLER_BYTE1, 'f');
+            EXPECT_EQ(buffer[4] ^ SCRAMBLER_BYTE2, 'f');
+            EXPECT_EQ(buffer[5] ^ SCRAMBLER_BYTE3, 'f');
+        }
+    }
+}