Merge branch 'ism' of github.com:carlesfernandez/gnss-sdr into ism

src/core/system_parameters/galileo_ism.cc

@@ -15,7 +15,6 @@
  */
 
 #include "galileo_ism.h"
-#include <boost/crc.hpp>
 #include <boost/dynamic_bitset.hpp>
 #include <algorithm>
 #include <vector>
@@ -176,15 +175,12 @@ uint16_t Galileo_ISM::get_Tvalidity_hours() const
 }
 
 
-bool Galileo_ISM::check_ism_crc(const std::bitset<GALILEO_DATA_JK_BITS>& bits) const
+bool Galileo_ISM::check_ism_crc(const std::bitset<GALILEO_DATA_JK_BITS>& bits)
 {
     boost::dynamic_bitset<unsigned char> frame_bits(bits.to_string().substr(0, GALILEO_ISM_CRC_DATA_BITS));
-
     std::vector<unsigned char> bytes;
     boost::to_block_range(frame_bits, std::back_inserter(bytes));
     std::reverse(bytes.begin(), bytes.end());
-
-    boost::crc_32_type crc32_ism;
     crc32_ism.process_bytes(bytes.data(), GALILEO_ISM_CRC_DATA_BYTES);
     const uint32_t crc_computed = crc32_ism.checksum();
     if (this->ism_crc == crc_computed)
@@ -194,3 +190,11 @@ bool Galileo_ISM::check_ism_crc(const std::bitset<GALILEO_DATA_JK_BITS>& bits) c
 
     return false;
 }
+
+
+uint32_t Galileo_ISM::compute_crc(const std::vector<uint8_t>& data)
+{
+    crc32_ism.process_bytes(data.data(), data.size());
+    uint32_t result = crc32_ism.checksum();
+    return result;
+}

src/core/system_parameters/galileo_ism.h

@@ -19,9 +19,11 @@
 #define GNSS_SDR_GALILEO_ISM_H
 
 #include "Galileo_INAV.h"
+#include <boost/crc.hpp>
 #include <bitset>
 #include <cstdint>
 #include <unordered_map>
+#include <vector>
 
 /** \addtogroup Core
  * \{ */
@@ -41,7 +43,7 @@ public:
     /*!
      * Default constructor
      */
-    Galileo_ISM() = default;
+    Galileo_ISM() : crc32_ism(0x814141AB, 0, 0, false, false) {};
 
     void set_ism_constellation_id(uint8_t const_id);
     void set_ism_service_level_id(uint8_t sl_id);
@@ -57,7 +59,7 @@ public:
     void set_ism_Tvalidity(uint8_t tvalidity);
     void set_ism_crc(uint32_t crc);
 
-    bool check_ism_crc(const std::bitset<GALILEO_DATA_JK_BITS>& bits) const;
+    bool check_ism_crc(const std::bitset<GALILEO_DATA_JK_BITS>& bits);
 
     double get_pconst_value() const;
     double get_psat_value() const;
@@ -67,8 +69,11 @@ public:
     uint16_t get_WN_ISM() const;
     uint16_t get_t0_ISM() const;
     uint16_t get_Tvalidity_hours() const;
+    uint32_t compute_crc(const std::vector<uint8_t>& data);
 
 private:
+    boost::crc_basic<32> crc32_ism;
+
     // ICD 2.1 Table 97
     std::unordered_map<uint8_t, double> ISM_PCONST_MAP = {
         {0, 1.0e-8},
@@ -145,7 +150,6 @@ private:
         {14, 3.75},
         {15, 4.00}};
 
-
     // ICD 2.1 Table 101
     std::unordered_map<uint8_t, float> ISM_BNOM_MAP = {
         {0, 0.0},
@@ -165,7 +169,6 @@ private:
         {14, 2.0},
         {15, 2.4}};
 
-
     // ICD 2.1 Table 102
     std::unordered_map<uint8_t, uint16_t> ISM_TVALIDITY_MAP = {
         {0, 1},

src/tests/unit-tests/system-parameters/galileo_ism_test.cc

@@ -0,0 +1,43 @@
+/*!
+ * \file galileo_ism_test.cc
+ * \brief Tests for Galileo Integrity Support Message
+ * \author Carles Fernandez-Prades, 2024. cfernandez(at)cttc.es
+ *
+ *
+ * -----------------------------------------------------------------------------
+ *
+ * GNSS-SDR is a Global Navigation Satellite System software-defined receiver.
+ * This file is part of GNSS-SDR.
+ *
+ * Copyright (C) 2010-2023  (see AUTHORS file for a list of contributors)
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ *
+ * -----------------------------------------------------------------------------
+ */
+
+#include "galileo_ism.h"
+#include <gtest/gtest.h>
+#include <algorithm>
+#include <bitset>
+#include <vector>
+
+TEST(GalileoISMTest, CRC)
+{
+    Galileo_ISM gal_ism{};
+    uint32_t expected_crc = 3002390191;
+    std::bitset<96> input{"010110000010101010101010101010101010101010101010101010101010101010101010101010101010101010101010"};
+    std::vector<uint8_t> data_bytes;
+    for (size_t i = 0; i < input.size(); i += 8)
+        {
+            std::bitset<8> byte;
+            for (size_t j = 0; j < 8; j++)
+                {
+                    byte[j] = input[i + j];
+                }
+            data_bytes.push_back(static_cast<uint8_t>(byte.to_ulong()));
+        }
+
+    std::reverse(data_bytes.begin(), data_bytes.end());
+    auto computed_crc = gal_ism.compute_crc(data_bytes);
+    EXPECT_TRUE(computed_crc == expected_crc);
+}