isa-l/crc/crc64_ref.h

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#ifndef _CRC64_REF_H
#define _CRC64_REF_H

#ifdef __cplusplus
extern "C" {
#endif

#include "crc64.h"

#ifdef _MSC_VER
#define inline __inline
#endif

#define MAX_ITER 8

// crc64_ecma reference function, slow crc64 from the definition.
static inline uint64_t
crc64_ecma_refl_ref(uint64_t seed, const uint8_t *buf, uint64_t len)
{
        uint64_t rem = ~seed;
        unsigned int i, j;

        uint64_t poly = 0xC96C5795D7870F42ULL; // ECMA-182 standard reflected

        for (i = 0; i < len; i++) {
                rem = rem ^ (uint64_t) buf[i];
                for (j = 0; j < MAX_ITER; j++) {
                        rem = (rem & 0x1ULL ? poly : 0) ^ (rem >> 1);
                }
        }
        return ~rem;
}

static inline uint64_t
crc64_ecma_norm_ref(uint64_t seed, const uint8_t *buf, uint64_t len)
{
        uint64_t rem = ~seed;
        unsigned int i, j;

        uint64_t poly = 0x42F0E1EBA9EA3693ULL; // ECMA-182 standard

        for (i = 0; i < len; i++) {
                rem = rem ^ ((uint64_t) buf[i] << 56);
                for (j = 0; j < MAX_ITER; j++) {
                        rem = (rem & 0x8000000000000000ULL ? poly : 0) ^ (rem << 1);
                }
        }
        return ~rem;
}

// crc64_iso reference function, slow crc64 from the definition.
static inline uint64_t
crc64_iso_refl_ref(uint64_t seed, const uint8_t *buf, uint64_t len)
{
        uint64_t rem = ~seed;
        unsigned int i, j;

        uint64_t poly = 0xD800000000000000ULL; // ISO standard reflected

        for (i = 0; i < len; i++) {
                rem = rem ^ (uint64_t) buf[i];
                for (j = 0; j < MAX_ITER; j++) {
                        rem = (rem & 0x1ULL ? poly : 0) ^ (rem >> 1);
                }
        }
        return ~rem;
}

static inline uint64_t
crc64_iso_norm_ref(uint64_t seed, const uint8_t *buf, uint64_t len)
{
        uint64_t rem = ~seed;
        unsigned int i, j;

        uint64_t poly = 0x000000000000001BULL; // ISO standard

        for (i = 0; i < len; i++) {
                rem = rem ^ ((uint64_t) buf[i] << 56);
                for (j = 0; j < MAX_ITER; j++) {
                        rem = (rem & 0x8000000000000000ULL ? poly : 0) ^ (rem << 1);
                }
        }
        return ~rem;
}

// crc64_jones reference function, slow crc64 from the definition.
static inline uint64_t
crc64_jones_refl_ref(uint64_t seed, const uint8_t *buf, uint64_t len)
{
        uint64_t rem = ~seed;
        unsigned int i, j;

        uint64_t poly = 0x95ac9329ac4bc9b5ULL; // Jones coefficients reflected

        for (i = 0; i < len; i++) {
                rem = rem ^ (uint64_t) buf[i];
                for (j = 0; j < MAX_ITER; j++) {
                        rem = (rem & 0x1ULL ? poly : 0) ^ (rem >> 1);
                }
        }
        return ~rem;
}

static inline uint64_t
crc64_jones_norm_ref(uint64_t seed, const uint8_t *buf, uint64_t len)
{
        uint64_t rem = ~seed;
        unsigned int i, j;

        uint64_t poly = 0xad93d23594c935a9ULL; // Jones coefficients

        for (i = 0; i < len; i++) {
                rem = rem ^ ((uint64_t) buf[i] << 56);
                for (j = 0; j < MAX_ITER; j++) {
                        rem = (rem & 0x8000000000000000ULL ? poly : 0) ^ (rem << 1);
                }
        }
        return ~rem;
}

// crc64_rocksoft reference function, slow crc64 from the definition.
static inline uint64_t
crc64_rocksoft_refl_ref(uint64_t seed, const uint8_t *buf, uint64_t len)
{
        uint64_t rem = ~seed;
        unsigned int i, j;

        uint64_t poly = 0x9a6c9329ac4bc9b5ULL; // Rocksoft coefficients reflected

        for (i = 0; i < len; i++) {
                rem = rem ^ (uint64_t) buf[i];
                for (j = 0; j < MAX_ITER; j++) {
                        rem = (rem & 0x1ULL ? poly : 0) ^ (rem >> 1);
                }
        }
        return ~rem;
}

static inline uint64_t
crc64_rocksoft_norm_ref(uint64_t seed, const uint8_t *buf, uint64_t len)
{
        uint64_t rem = ~seed;
        unsigned int i, j;

        uint64_t poly = 0xad93d23594c93659ULL; // Rocksoft coefficients

        for (i = 0; i < len; i++) {
                rem = rem ^ ((uint64_t) buf[i] << 56);
                for (j = 0; j < MAX_ITER; j++) {
                        rem = (rem & 0x8000000000000000ULL ? poly : 0) ^ (rem << 1);
                }
        }
        return ~rem;
}
#ifdef __cplusplus
}
#endif

#endif