crc32c.cc File Reference

#include "util/crc32c.h"
#include <stdint.h>
#include "port/port.h"
#include "util/coding.h"

Namespaces
	leveldb
	leveldb::crc32c

Macros
#define	STEP1
#define	STEP4

Functions
static uint32_t	leveldb::crc32c::LE_LOAD32 (const uint8_t *p)
static bool	leveldb::crc32c::CanAccelerateCRC32C ()
uint32_t	leveldb::crc32c::Extend (uint32_t crc, const char *buf, size_t size)

Variables
static const uint32_t	leveldb::crc32c::table0_ [256]
static const uint32_t	leveldb::crc32c::table1_ [256]
static const uint32_t	leveldb::crc32c::table2_ [256]
static const uint32_t	leveldb::crc32c::table3_ [256]

Macro Definition Documentation

STEP1

#define STEP1

Value:

do {                              \
    int c = (l & 0xff) ^ *p++;                  \
    l = table0_[c] ^ (l >> 8);                  \
} while (0)

STEP4

#define STEP4

Value:

do {                              \
    uint32_t c = l ^ LE_LOAD32(p);              \
    p += 4;                                     \
    l = table3_[c & 0xff] ^                     \
        table2_[(c >> 8) & 0xff] ^              \
        table1_[(c >> 16) & 0xff] ^             \
        table0_[c >> 24];                       \
} while (0)