#include <stdint.h>
#include <string.h>

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Functions
uint32_t	crc32c_hw (uint32_t crc, const void *buf, size_t len)

uint32_t	crc32c_sw (uint32_t crc, const void *buf, size_t len)

uint32_t	crc32c (uint32_t crc, const void *buf, size_t len)

Function Documentation

◆ crc32c()

uint32_t crc32c	(	uint32_t	crc,
		const void *	buf,
		size_t	len
	)

Definition at line 399 of file crc32c.cxx.

{
#if defined(HAVE_AMD64_CRC32C)
    int sse42;
    SSE42(sse42);
    return sse42 ? crc32c_hw_amd64(crc, buf, len) : crc32c_sw(crc, buf, len);
#elif defined(HAVE_ARM64_CRC32C)
    return crc32c_hw_arm64(crc, buf, len);
#else
#warning Hardware accelerated CRC32C is not available.
    return crc32c_sw(crc, buf, len);
#endif // HAVE_AMD64_CRC32C
}

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◆ crc32c_hw()

uint32_t crc32c_hw	(	uint32_t	crc,
		const void *	buf,
		size_t	len
	)

Definition at line 413 of file crc32c.cxx.

{
#if defined(HAVE_AMD64_CRC32C)
    return crc32c_hw_amd64(crc, buf, len);
#elif defined(HAVE_ARM64_CRC32C)
    return crc32c_hw_arm64(crc, buf, len);
#else
#warning Hardware accelerated CRC32C is not available.
    abort();
#endif // HAVE_AMD64_CRC32C
}

◆ crc32c_sw()

uint32_t crc32c_sw	(	uint32_t	crc,
		const void *	buf,
		size_t	len
	)

Definition at line 101 of file crc32c.cxx.

{
    const unsigned char *next = (const unsigned char*)buf;
    uint64_t crc;
 
    //printf("crc32c_sw!\n");
 
    pthread_once(&crc32c_once_sw, crc32c_init_sw);
    crc = crci ^ 0xffffffff;
    while (len && ((uintptr_t)next & 7) != 0) {
        crc = crc32c_table[0][(crc ^ *next++) & 0xff] ^ (crc >> 8);
        len--;
    }
    while (len >= 8) {
        crc ^= *(uint64_t *)next;
        crc = crc32c_table[7][crc & 0xff] ^
              crc32c_table[6][(crc >> 8) & 0xff] ^
              crc32c_table[5][(crc >> 16) & 0xff] ^
              crc32c_table[4][(crc >> 24) & 0xff] ^
              crc32c_table[3][(crc >> 32) & 0xff] ^
              crc32c_table[2][(crc >> 40) & 0xff] ^
              crc32c_table[1][(crc >> 48) & 0xff] ^
              crc32c_table[0][crc >> 56];
        next += 8;
        len -= 8;
    }
    while (len) {
        crc = crc32c_table[0][(crc ^ *next++) & 0xff] ^ (crc >> 8);
        len--;
    }
    return (uint32_t)crc ^ 0xffffffff;
}