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