postgresql/contrib/tsearch2/gistidx.h
2006-03-11 04:38:42 +00:00

63 lines
1.6 KiB
C

/* $PostgreSQL: pgsql/contrib/tsearch2/gistidx.h,v 1.7 2006/03/11 04:38:30 momjian Exp $ */
#ifndef __GISTIDX_H__
#define __GISTIDX_H__
/*
#define GISTIDX_DEBUG
*/
/*
* signature defines
*/
#define SIGLENINT 63 /* >121 => key will toast, so it will not work
* !!! */
#define SIGLEN ( sizeof(int4) * SIGLENINT )
#define SIGLENBIT (SIGLEN * BITS_PER_BYTE)
typedef char BITVEC[SIGLEN];
typedef char *BITVECP;
#define LOOPBYTE(a) \
for(i=0;i<SIGLEN;i++) {\
a;\
}
#define GETBYTE(x,i) ( *( (BITVECP)(x) + (int)( (i) / BITS_PER_BYTE ) ) )
#define GETBITBYTE(x,i) ( ((char)(x)) >> (i) & 0x01 )
#define CLRBIT(x,i) GETBYTE(x,i) &= ~( 0x01 << ( (i) % BITS_PER_BYTE ) )
#define SETBIT(x,i) GETBYTE(x,i) |= ( 0x01 << ( (i) % BITS_PER_BYTE ) )
#define GETBIT(x,i) ( (GETBYTE(x,i) >> ( (i) % BITS_PER_BYTE )) & 0x01 )
#define HASHVAL(val) (((unsigned int)(val)) % SIGLENBIT)
#define HASH(sign, val) SETBIT((sign), HASHVAL(val))
/*
* type of index key
*/
typedef struct
{
int4 len;
int4 flag;
char data[1];
} GISTTYPE;
#define ARRKEY 0x01
#define SIGNKEY 0x02
#define ALLISTRUE 0x04
#define ISARRKEY(x) ( ((GISTTYPE*)(x))->flag & ARRKEY )
#define ISSIGNKEY(x) ( ((GISTTYPE*)(x))->flag & SIGNKEY )
#define ISALLTRUE(x) ( ((GISTTYPE*)(x))->flag & ALLISTRUE )
#define GTHDRSIZE ( sizeof(int4) * 2 )
#define CALCGTSIZE(flag, len) ( GTHDRSIZE + ( ( (flag) & ARRKEY ) ? ((len)*sizeof(int4)) : (((flag) & ALLISTRUE) ? 0 : SIGLEN) ) )
#define GETSIGN(x) ( (BITVECP)( (char*)(x)+GTHDRSIZE ) )
#define GETARR(x) ( (int4*)( (char*)(x)+GTHDRSIZE ) )
#define ARRNELEM(x) ( ( ((GISTTYPE*)(x))->len - GTHDRSIZE )/sizeof(int4) )
#endif