CRC.h

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/* Copyright (c) 2020 Skyward Experimental Rocketry
 * Author: Alberto Nidasio
 *
 * 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
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 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
 
#include <stddef.h>
#include <stdint.h>
 
namespace Boardcore
{
 
namespace CRCUtils
{
 
template <uint16_t poly, uint16_t init>
uint16_t generiCrc16(const uint8_t* buffer, size_t count)
{
    uint16_t crc = init;
 
    for (size_t i = 0; i < count; i++)
    {
        crc ^= static_cast<uint16_t>(buffer[i]) << 8;
 
        for (uint8_t ii = 0; ii < 8; ii++)
            if (crc & 0x8000)
                crc = (crc << 1) ^ poly;
            else
                crc <<= 1;
    }
 
    return crc;
}
 
const auto crc16 = generiCrc16<0x1021, 0xffff>;
 
}  // namespace CRCUtils
 
}  // namespace Boardcore