git subrepo clone --branch=20.41.6 git@github.com:ETLCPP/etl.git components/etl

subrepo:
  subdir:   "components/etl"
  merged:   "be5537ec"
upstream:
  origin:   "git@github.com:ETLCPP/etl.git"
  branch:   "20.41.6"
  commit:   "be5537ec"
git-subrepo:
  version:  "0.4.9"
  origin:   "???"
  commit:   "???"

components/etl/test/test_crc1.cpp

@@ -0,0 +1,151 @@
+/******************************************************************************
+The MIT License(MIT)
+
+Embedded Template Library.
+https://github.com/ETLCPP/etl
+https://www.etlcpp.com
+
+Copyright(c) 2023 John Wellbelove
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files(the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and / or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions :
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+******************************************************************************/
+
+#include "unit_test_framework.h"
+
+#include <iterator>
+#include <string>
+#include <vector>
+#include <stdint.h>
+
+#include "etl/crc1.h"
+
+namespace
+{
+  //***************************************************************************
+  // Calculate parity the simple way.
+  //***************************************************************************
+  template <typename TIterator>
+  int calculate_parity(TIterator b, TIterator e)
+  {
+    size_t count = 0;
+
+    while (b != e)
+    {
+      count += etl::count_bits(*b);
+      ++b;
+    }
+
+    return ((count &= 1) == 0) ? etl::crc1::even_parity : etl::crc1::odd_parity;
+  }
+
+  SUITE(test_crc1)
+  {
+    //*************************************************************************
+    TEST(test_crc1_constructor)
+    {
+      std::string data("123456789");
+
+      uint8_t crc = etl::crc1(data.begin(), data.end());
+
+      CHECK_EQUAL(calculate_parity(data.begin(), data.end()), int(crc));
+    }
+
+#if ETL_USING_CPP14 && !defined(ETL_CRC_FORCE_CPP03_IMPLEMENTATION)
+    //*************************************************************************
+    TEST(test_crc1_constructor_constexpr)
+    {
+      constexpr char data[] = "123456789";
+      constexpr uint8_t crc = etl::crc1(data, data + 9);
+
+      CHECK_EQUAL(calculate_parity(data, data + 9), int(crc));
+    }
+#endif
+
+    //*************************************************************************
+    TEST(test_crc1_add_values)
+    {
+      std::string data("123456789");
+
+      etl::crc1 crc_calculator;
+
+      for (size_t i = 0UL; i < data.size(); ++i)
+      {
+        crc_calculator.add(data[i]);
+      }
+
+      uint8_t crc = crc_calculator;
+
+      CHECK_EQUAL(calculate_parity(data.begin(), data.end()), int(crc));
+    }
+
+    //*************************************************************************
+    TEST(test_crc1_add_range)
+    {
+      std::string data("123456789");
+
+      etl::crc1 crc_calculator;
+
+      crc_calculator.add(data.begin(), data.end());
+
+      uint8_t crc = crc_calculator.value();
+
+      CHECK_EQUAL(calculate_parity(data.begin(), data.end()), int(crc));
+    }
+
+    //*************************************************************************
+    TEST(test_crc1_add_range_via_iterator)
+    {
+      std::string data("123456789");
+
+      etl::crc1 crc_calculator;
+
+      std::copy(data.begin(), data.end(), crc_calculator.input());
+
+      uint8_t crc = crc_calculator.value();
+
+      CHECK_EQUAL(calculate_parity(data.begin(), data.end()), int(crc));
+    }
+
+    //*************************************************************************
+    TEST(test_crc1_add_range_endian)
+    {
+      std::vector<uint8_t>  data1 = { 0x01U, 0x02U, 0x03U, 0x04U, 0x05U, 0x06U, 0x07U, 0x08U };
+      std::vector<uint32_t> data2 = { 0x04030201UL, 0x08070605UL };
+      std::vector<uint8_t>  data3 = { 0x08U, 0x07U, 0x06U, 0x05U, 0x04U, 0x03U, 0x02U, 0x01U };
+
+      uint8_t crc1 = etl::crc1(data1.begin(), data1.end());
+      uint8_t crc2 = etl::crc1((uint8_t*)&data2[0], (uint8_t*)(&data2[0] + data2.size()));
+      CHECK_EQUAL(int(crc1), int(crc2));
+
+      uint8_t crc3 = etl::crc1(data3.rbegin(), data3.rend());
+      CHECK_EQUAL(int(crc1), int(crc3));
+    }
+
+    //*************************************************************************
+    TEST(test_crc1_constants)
+    {
+      std::vector<uint8_t> data_odd{  etl::b00000001, etl::b00000111, etl::b01010001, etl::b10000100 };
+      std::vector<uint8_t> data_even{ etl::b00000001, etl::b01000111, etl::b01010001, etl::b10000100 };
+
+      CHECK_EQUAL(etl::crc1::odd_parity,  etl::crc1(data_odd.begin(),  data_odd.end()));
+      CHECK_EQUAL(etl::crc1::even_parity, etl::crc1(data_even.begin(), data_even.end()));
+    }
+  };
+}
+