.. _program_listing_file__tmp_ws_src_ublox_ublox_serialization_include_ublox_serialization_checksum.hpp:

Program Listing for File checksum.hpp
=====================================

|exhale_lsh| :ref:`Return to documentation for file <file__tmp_ws_src_ublox_ublox_serialization_include_ublox_serialization_checksum.hpp>` (``/tmp/ws/src/ublox/ublox_serialization/include/ublox_serialization/checksum.hpp``)

.. |exhale_lsh| unicode:: U+021B0 .. UPWARDS ARROW WITH TIP LEFTWARDS

.. code-block:: cpp

   //==============================================================================
   // Copyright (c) 2012, Johannes Meyer, TU Darmstadt
   // All rights reserved.
   
   // Redistribution and use in source and binary forms, with or without
   // modification, are permitted provided that the following conditions are met:
   //     * Redistributions of source code must retain the above copyright
   //       notice, this list of conditions and the following disclaimer.
   //     * Redistributions in binary form must reproduce the above copyright
   //       notice, this list of conditions and the following disclaimer in the
   //       documentation and/or other materials provided with the distribution.
   //     * Neither the name of the Flight Systems and Automatic Control group,
   //       TU Darmstadt, nor the names of its contributors may be used to
   //       endorse or promote products derived from this software without
   //       specific prior written permission.
   
   // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
   // AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   // ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR ANY
   // DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
   // (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   // LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   // ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
   // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   //==============================================================================
   
   #ifndef UBLOX_SERIALIZATION_CHECKSUM_HPP
   #define UBLOX_SERIALIZATION_CHECKSUM_HPP
   
   #include <cstdint>
   
   namespace ublox {
   
   static inline void calculateChecksum(const uint8_t *data,
                                        uint32_t size,
                                        uint8_t &ck_a,
                                        uint8_t &ck_b) {
     ck_a = 0; ck_b = 0;
     for(uint32_t i = 0; i < size; ++i)
     {
       ck_a = ck_a + data[i];
       ck_b = ck_b + ck_a;
     }
   }
   
   static inline uint16_t calculateChecksum(const uint8_t *data,
                                            uint32_t size,
                                            uint16_t &checksum) {
     uint8_t *byte = reinterpret_cast<uint8_t *>(&checksum);
     calculateChecksum(data, size, byte[0], byte[1]);
     return checksum;
   }
   
   }  // namespace ublox
   
   #endif  // UBLOX_SERIALIZATION_CHECKSUM_HPP