File content as of revision 90:c233d1c265ff:

#include "crc.h"

namespace OneWire
{
    namespace crc
    {
        uint8_t calculateCrc8(uint8_t crc8, uint8_t data)
        {
            // See Application Note 27
            crc8 = crc8 ^ data;
            for (int i = 0; i < 8; i++)
            {
                if (crc8 & 1)
                {
                    crc8 = (crc8 >> 1) ^ 0x8c;
                }
                else
                {
                    crc8 = (crc8 >> 1);
                }
            }
         
            return crc8;
        }
         
        uint8_t calculateCrc8(const uint8_t * data, size_t dataLen, uint8_t crc)
        {
            for (size_t i = 0; i < dataLen; i++)
            {
                crc = calculateCrc8(crc, data[i]);
            }
            return crc;
        }
         
        uint16_t calculateCrc16(uint16_t crc16, uint16_t data)
        {
            const uint16_t oddparity[] = { 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0 };

            data = (data ^ (crc16 & 0xff)) & 0xff;
            crc16 >>= 8;

            if (oddparity[data & 0xf] ^ oddparity[data >> 4])
            {
                crc16 ^= 0xc001;
            }

            data <<= 6;
            crc16 ^= data;
            data <<= 1;
            crc16 ^= data;

            return crc16;
        }

        uint16_t calculateCrc16(const uint8_t * data, size_t dataOffset, size_t dataLen, uint16_t crc)
        {
            for (size_t i = dataOffset; i < (dataLen + dataOffset); i++)
            {
                crc = calculateCrc16(crc, data[i]);
            }
            return crc;
        }
    }
}