Crc.cxx

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#include <stdint.h>
 
#include "utils/Crc.hxx"
#include "utils/macros.h"
 
static const uint16_t crc_16_ibm_init_value = 0x0000; // TODO: check
static const uint16_t crc_16_ibm_poly = 0xA001; // TODO: check
 
uint8_t reverse(uint8_t data)
{
    uint8_t out = 0;
    for (int i = 0; i < 8; i++)
    {
        out = (out << 1) | (data & 1);
        data >>= 1;
    }
    return out;
}
 
/*
 
static const uint16_t crc_16_ibm_poly = 0x8005; // WORKING
 
inline void crc_16_ibm_add(uint16_t& state, uint8_t data)
{
    //data = reverse(data);
    // This does LSB-first.
    for (int i = 0; i < 8; i++)
    {
        bool bit = data & 1;
        data >>= 1;
        if (state & 0x8000)
        {
            bit = !bit;
        }
        if (bit)
        {
            state = (state << 1) ^ crc_16_ibm_poly;
        }
        else
        {
            state = (state << 1);
        }
    }
}
 
inline uint16_t crc_16_ibm_finish(uint16_t state)
{
    return (reverse(state & 0xff) << 8) | reverse(state >> 8);
    //crc_16_ibm_add(state, 0);
    //crc_16_ibm_add(state, 0);
    //return state;
}*/
 
static const uint16_t CRC16_IBM_HI[16] =
{
    0x0000, 0xcc01, 0xd801, 0x1400, 0xf001, 0x3c00, 0x2800, 0xe401,
    0xa001, 0x6c00, 0x7800, 0xb401, 0x5000, 0x9c01, 0x8801, 0x4400,
};
static const uint16_t CRC16_IBM_LO[16] =
{
    0x0000, 0xc0c1, 0xc181, 0x0140, 0xc301, 0x03c0, 0x0280, 0xc241,
    0xc601, 0x06c0, 0x0780, 0xc741, 0x0500, 0xc5c1, 0xc481, 0x0440,
};
 
inline void __attribute__((always_inline))
crc_16_ibm_add(uint16_t &state, uint8_t data)
{
    state ^= data;
    state = (state >> 8) ^ CRC16_IBM_LO[state & 0xf] ^
        CRC16_IBM_HI[(state >> 4) & 0xf];
}
 
void crc_16_ibm_add_basic(uint16_t &state, uint8_t data)
{
    state ^= data;
    for (int i = 0; i < 8; i++)
    {
        if (state & 1)
        {
            state = (state >> 1) ^ crc_16_ibm_poly;
        }
        else
        {
            state = (state >> 1);
        }
    }
}
 
inline uint16_t crc_16_ibm_finish(uint16_t state)
{
    //return (reverse(state & 0xff) << 8) | reverse(state >> 8);
    //crc_16_ibm_add(state, 0);
    //crc_16_ibm_add(state, 0);
    return state;
}
 
 
uint16_t crc_16_ibm(const void* data, size_t length)
{
    const uint8_t *payload = static_cast<const uint8_t*>(data);
    uint16_t state = crc_16_ibm_init_value;
    for (size_t i = 0; i < length; ++i)
    {
        crc_16_ibm_add(state, payload[i]);
    }
    return crc_16_ibm_finish(state);
}
 
void crc3_crc16_ibm(const void* data, size_t length_bytes, uint16_t* checksum)
{
    uint16_t state1 = crc_16_ibm_init_value;
    uint16_t state2 = crc_16_ibm_init_value;
    uint16_t state3 = crc_16_ibm_init_value;
 
#ifdef ESP_NONOS
    // Aligned reads only.
    const uint32_t* payload = static_cast<const uint32_t*>(data);
    HASSERT((((uint32_t)payload) & 3) == 0);
    uint32_t cword = 0;
    for (size_t i = 1; i <= length_bytes; ++i)
    {
        if ((i & 3) == 1)
        {
            cword = payload[(i - 1) >> 2];
        }
        else
        {
            cword >>= 8;
        }
        uint8_t cbyte = cword & 0xff;
        crc_16_ibm_add(state1, cbyte);
        if (i & 1)
        {
            // odd byte
            crc_16_ibm_add(state2, cbyte);
        }
        else
        {
            // even byte
            crc_16_ibm_add(state3, cbyte);
        }
    }
#else
    const uint8_t *payload = static_cast<const uint8_t*>(data);
    for (size_t i = 1; i <= length_bytes; ++i)
    {
        crc_16_ibm_add(state1, payload[i-1]);
        if (i & 1)
        {
            // odd byte
            crc_16_ibm_add(state2, payload[i-1]);
        }
        else
        {
            // even byte
            crc_16_ibm_add(state3, payload[i-1]);
        }
    }
#endif
 
    checksum[0] = crc_16_ibm_finish(state1);
    checksum[1] = crc_16_ibm_finish(state2);
    checksum[2] = crc_16_ibm_finish(state3);
}
 
// static
const uint8_t Crc8DallasMaxim::table256[256] =
{
    0x00, 0x5e, 0xbc, 0xe2, 0x61, 0x3f, 0xdd, 0x83,
    0xc2, 0x9c, 0x7e, 0x20, 0xa3, 0xfd, 0x1f, 0x41,
    0x9d, 0xc3, 0x21, 0x7f, 0xfc, 0xa2, 0x40, 0x1e,
    0x5f, 0x01, 0xe3, 0xbd, 0x3e, 0x60, 0x82, 0xdc,
    0x23, 0x7d, 0x9f, 0xc1, 0x42, 0x1c, 0xfe, 0xa0,
    0xe1, 0xbf, 0x5d, 0x03, 0x80, 0xde, 0x3c, 0x62,
    0xbe, 0xe0, 0x02, 0x5c, 0xdf, 0x81, 0x63, 0x3d,
    0x7c, 0x22, 0xc0, 0x9e, 0x1d, 0x43, 0xa1, 0xff,
    0x46, 0x18, 0xfa, 0xa4, 0x27, 0x79, 0x9b, 0xc5,
    0x84, 0xda, 0x38, 0x66, 0xe5, 0xbb, 0x59, 0x07,
    0xdb, 0x85, 0x67, 0x39, 0xba, 0xe4, 0x06, 0x58,
    0x19, 0x47, 0xa5, 0xfb, 0x78, 0x26, 0xc4, 0x9a,
    0x65, 0x3b, 0xd9, 0x87, 0x04, 0x5a, 0xb8, 0xe6,
    0xa7, 0xf9, 0x1b, 0x45, 0xc6, 0x98, 0x7a, 0x24,
    0xf8, 0xa6, 0x44, 0x1a, 0x99, 0xc7, 0x25, 0x7b,
    0x3a, 0x64, 0x86, 0xd8, 0x5b, 0x05, 0xe7, 0xb9,
    0x8c, 0xd2, 0x30, 0x6e, 0xed, 0xb3, 0x51, 0x0f,
    0x4e, 0x10, 0xf2, 0xac, 0x2f, 0x71, 0x93, 0xcd,
    0x11, 0x4f, 0xad, 0xf3, 0x70, 0x2e, 0xcc, 0x92,
    0xd3, 0x8d, 0x6f, 0x31, 0xb2, 0xec, 0x0e, 0x50,
    0xaf, 0xf1, 0x13, 0x4d, 0xce, 0x90, 0x72, 0x2c,
    0x6d, 0x33, 0xd1, 0x8f, 0x0c, 0x52, 0xb0, 0xee,
    0x32, 0x6c, 0x8e, 0xd0, 0x53, 0x0d, 0xef, 0xb1,
    0xf0, 0xae, 0x4c, 0x12, 0x91, 0xcf, 0x2d, 0x73,
    0xca, 0x94, 0x76, 0x28, 0xab, 0xf5, 0x17, 0x49,
    0x08, 0x56, 0xb4, 0xea, 0x69, 0x37, 0xd5, 0x8b,
    0x57, 0x09, 0xeb, 0xb5, 0x36, 0x68, 0x8a, 0xd4,
    0x95, 0xcb, 0x29, 0x77, 0xf4, 0xaa, 0x48, 0x16,
    0xe9, 0xb7, 0x55, 0x0b, 0x88, 0xd6, 0x34, 0x6a,
    0x2b, 0x75, 0x97, 0xc9, 0x4a, 0x14, 0xf6, 0xa8,
    0x74, 0x2a, 0xc8, 0x96, 0x15, 0x4b, 0xa9, 0xf7,
    0xb6, 0xe8, 0x0a, 0x54, 0xd7, 0x89, 0x6b, 0x35,
};
 
// static
const uint8_t Crc8DallasMaxim::tableLo16[16] =
{
    0x00, 0x5e, 0xbc, 0xe2, 0x61, 0x3f, 0xdd, 0x83,
    0xc2, 0x9c, 0x7e, 0x20, 0xa3, 0xfd, 0x1f, 0x41,
};
 
// static
const uint8_t Crc8DallasMaxim::tableHi16[16] =
{
    0x00, 0x9d, 0x23, 0xbe, 0x46, 0xdb, 0x65, 0xf8,
    0x8c, 0x11, 0xaf, 0x32, 0xca, 0x57, 0xe9, 0x74
};
 
const uint16_t Crc16CCITT::table256[256] =
{
    0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50A5, 0x60C6, 0x70E7,
    0x8108, 0x9129, 0xA14A, 0xB16B, 0xC18C, 0xD1AD, 0xE1CE, 0xF1EF,
    0x1231, 0x0210, 0x3273, 0x2252, 0x52B5, 0x4294, 0x72F7, 0x62D6,
    0x9339, 0x8318, 0xB37B, 0xA35A, 0xD3BD, 0xC39C, 0xF3FF, 0xE3DE,
    0x2462, 0x3443, 0x0420, 0x1401, 0x64E6, 0x74C7, 0x44A4, 0x5485,
    0xA56A, 0xB54B, 0x8528, 0x9509, 0xE5EE, 0xF5CF, 0xC5AC, 0xD58D,
    0x3653, 0x2672, 0x1611, 0x0630, 0x76D7, 0x66F6, 0x5695, 0x46B4,
    0xB75B, 0xA77A, 0x9719, 0x8738, 0xF7DF, 0xE7FE, 0xD79D, 0xC7BC,
    0x48C4, 0x58E5, 0x6886, 0x78A7, 0x0840, 0x1861, 0x2802, 0x3823,
    0xC9CC, 0xD9ED, 0xE98E, 0xF9AF, 0x8948, 0x9969, 0xA90A, 0xB92B,
    0x5AF5, 0x4AD4, 0x7AB7, 0x6A96, 0x1A71, 0x0A50, 0x3A33, 0x2A12,
    0xDBFD, 0xCBDC, 0xFBBF, 0xEB9E, 0x9B79, 0x8B58, 0xBB3B, 0xAB1A,
    0x6CA6, 0x7C87, 0x4CE4, 0x5CC5, 0x2C22, 0x3C03, 0x0C60, 0x1C41,
    0xEDAE, 0xFD8F, 0xCDEC, 0xDDCD, 0xAD2A, 0xBD0B, 0x8D68, 0x9D49,
    0x7E97, 0x6EB6, 0x5ED5, 0x4EF4, 0x3E13, 0x2E32, 0x1E51, 0x0E70,
    0xFF9F, 0xEFBE, 0xDFDD, 0xCFFC, 0xBF1B, 0xAF3A, 0x9F59, 0x8F78,
    0x9188, 0x81A9, 0xB1CA, 0xA1EB, 0xD10C, 0xC12D, 0xF14E, 0xE16F,
    0x1080, 0x00A1, 0x30C2, 0x20E3, 0x5004, 0x4025, 0x7046, 0x6067,
    0x83B9, 0x9398, 0xA3FB, 0xB3DA, 0xC33D, 0xD31C, 0xE37F, 0xF35E,
    0x02B1, 0x1290, 0x22F3, 0x32D2, 0x4235, 0x5214, 0x6277, 0x7256,
    0xB5EA, 0xA5CB, 0x95A8, 0x8589, 0xF56E, 0xE54F, 0xD52C, 0xC50D,
    0x34E2, 0x24C3, 0x14A0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405,
    0xA7DB, 0xB7FA, 0x8799, 0x97B8, 0xE75F, 0xF77E, 0xC71D, 0xD73C,
    0x26D3, 0x36F2, 0x0691, 0x16B0, 0x6657, 0x7676, 0x4615, 0x5634,
    0xD94C, 0xC96D, 0xF90E, 0xE92F, 0x99C8, 0x89E9, 0xB98A, 0xA9AB,
    0x5844, 0x4865, 0x7806, 0x6827, 0x18C0, 0x08E1, 0x3882, 0x28A3,
    0xCB7D, 0xDB5C, 0xEB3F, 0xFB1E, 0x8BF9, 0x9BD8, 0xABBB, 0xBB9A,
    0x4A75, 0x5A54, 0x6A37, 0x7A16, 0x0AF1, 0x1AD0, 0x2AB3, 0x3A92,
    0xFD2E, 0xED0F, 0xDD6C, 0xCD4D, 0xBDAA, 0xAD8B, 0x9DE8, 0x8DC9,
    0x7C26, 0x6C07, 0x5C64, 0x4C45, 0x3CA2, 0x2C83, 0x1CE0, 0x0CC1,
    0xEF1F, 0xFF3E, 0xCF5D, 0xDF7C, 0xAF9B, 0xBFBA, 0x8FD9, 0x9FF8,
    0x6E17, 0x7E36, 0x4E55, 0x5E74, 0x2E93, 0x3EB2, 0x0ED1, 0x1EF0
};
 
const uint16_t Crc16CCITT::tableLo16[16] =
{
    0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50A5, 0x60C6, 0x70E7,
    0x8108, 0x9129, 0xA14A, 0xB16B, 0xC18C, 0xD1AD, 0xE1CE, 0xF1EF
};
 
const uint16_t Crc16CCITT::tableHi16[16] =
{
    0x0000, 0x1231, 0x2462, 0x3653, 0x48C4, 0x5AF5, 0x6CA6, 0x7E97,
    0x9188, 0x83B9, 0xB5EA, 0xA7DB, 0xD94C, 0xCB7D, 0xFD2E, 0xEF1F
};