crc32.c File Reference

#include "postgres.h"
#include <sys/types.h>
#include <stdio.h>
#include "crc32.h"

Include dependency graph for crc32.c:

Go to the source code of this file.

Defines
#define	TOLOWER(x)   (x)
#define	_CRC32_(crc, ch)   ((crc) = ((crc) >> 8) ^ crc32tab[((crc) ^ (ch)) & 0xff])
Functions
unsigned int	ltree_crc32_sz (char *buf, int size)
Variables
static const unsigned int	crc32tab [256]

---

Define Documentation

#define _CRC32_	(		crc,
			ch
	)			((crc) = ((crc) >> 8) ^ crc32tab[((crc) ^ (ch)) & 0xff])

Definition at line 27 of file crc32.c.

Referenced by ltree_crc32_sz().

#define TOLOWER

(

x

)

(x)

Definition at line 15 of file crc32.c.

Referenced by ltree_crc32_sz().

---

Function Documentation

unsigned int ltree_crc32_sz	(	char *	buf,
		int	size
	)

Definition at line 102 of file crc32.c.

References _CRC32_, and TOLOWER.

Referenced by gist_te(), hashing(), lquery_in(), and pushval_asis().

{
    unsigned int crc = ~((unsigned int) 0);
    char       *p;
    int         len,
                nr;

    len = 0;
    nr = size;
    for (len += nr, p = buf; nr--; ++p)
        _CRC32_(crc, TOLOWER((unsigned int) *p));
    return ~crc;
}

---

Variable Documentation

const unsigned int crc32tab[256] [static]

Definition at line 34 of file crc32.c.