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Checksum.cpp
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73 lines (65 loc) · 2.15 KB
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/*
* Copyright (c) 2020-2023 Alex Spataru <https://github.com/alex-spataru>
*
* 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 <IO/Checksum.h>
uint8_t IO::crc8(const char *data, const int length)
{
uint8_t crc = 0xff;
for (int i = 0; i < length; i++)
{
crc ^= data[i];
for (int j = 0; j < 8; j++)
{
if ((crc & 0x80) != 0)
crc = (uint8_t)((crc << 1) ^ 0x31);
else
crc <<= 1;
}
}
return crc;
}
uint16_t IO::crc16(const char *data, const int length)
{
uint8_t x;
uint16_t crc = 0xFFFF;
for (int i = 0; i < length; ++i)
{
x = crc >> 8 ^ data[i];
x ^= x >> 4;
crc = (crc << 8) ^ ((uint16_t)(x << 12)) ^ ((uint16_t)(x << 5)) ^ ((uint16_t)x);
}
return crc;
}
uint32_t IO::crc32(const char *data, const int length)
{
uint32_t mask;
uint32_t crc = 0xFFFFFFFF;
for (int i = 0; i < length; ++i)
{
crc = crc ^ data[i];
for (int j = 8; j >= 0; j--)
{
mask = -(crc & 1);
crc = (crc >> 1) ^ (0xEDB88320 & mask);
}
}
return ~crc;
}