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