crc32c.h File Reference

#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 391 of file crc32c.cxx.

{
#ifdef HAVE_HWCRC32C
    int sse42;
 
    SSE42(sse42);
    return sse42 ? crc32c_hw(crc, buf, len) : crc32c_sw(crc, buf, len);
#elif defined(__ARM_FEATURE_CRC32)
   return crc32c_arm_hw(crc, buf, len);
#else
#warning Hardware accelerated CRC32C is not available.
    return crc32c_sw(crc, buf, len);
#endif // HAVE_HWCRC32C
}

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crc32c_hw()

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

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crc32c_sw()

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

Definition at line 99 of file crc32c.cxx.

{
   const unsigned char *next = (const unsigned char*)buf;
    uint64_t crc;
 
    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;
}

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