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Disclaimer

All code downloadable below is provided under the BSD license.

Copyright (c) 2010, Mario Konrad. 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.
- The names of its contributors must not 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 OR CONTRIBUTORS 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.

Features

The implementation calculated the CRC number of specified data. You are able to choose one of the following checks:

• CRC - 8
• CRC - 10
• CRC - 12
• CRC - 16
• CRC - CCITT
• CRC - 32

Examples

Download

C:

• crc.c
• crc.h
• test.c

C++:

• crc.hpp
• test.cpp

GitHub: https://github.com/mariokonrad/crc

Alternative Implementation

CRC-8

void crc8(uint8_t n, uint8_t & crc)
{
  // polynom: x^8 + x^5 + x^4 + 1
  uint8_t c = crc;
  for (int i = 0; i < sizeof(n); ++i) {
    c = ((c ^ n) & 1)
      ? (c >> 1) ^ 0x8c
      : (c >> 1);
    n >>= 1;
  }
  crc = c;
}