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/*-------------------------------------------------------------------------
*
* varbit.h
* Functions for the SQL datatypes BIT() and BIT VARYING().
*
* Code originally contributed by Adriaan Joubert.
*
* Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* src/include/utils/varbit.h
*
*-------------------------------------------------------------------------
*/
#ifndef VARBIT_H
#define VARBIT_H
#include <limits.h>
#include "fmgr.h"
/*
* Modeled on struct varlena from postgres.h, but data type is bits8.
*/
typedef struct
{
int32 vl_len_; /* varlena header (do not touch directly!) */
int32 bit_len; /* number of valid bits */
bits8 bit_dat[1]; /* bit string, most sig. byte first */
} VarBit;
/*
* fmgr interface macros
*
* BIT and BIT VARYING are toastable varlena types. They are the same
* as far as representation goes, so we just have one set of macros.
*/
#define DatumGetVarBitP(X) ((VarBit *) PG_DETOAST_DATUM(X))
#define DatumGetVarBitPCopy(X) ((VarBit *) PG_DETOAST_DATUM_COPY(X))
#define VarBitPGetDatum(X) PointerGetDatum(X)
#define PG_GETARG_VARBIT_P(n) DatumGetVarBitP(PG_GETARG_DATUM(n))
#define PG_GETARG_VARBIT_P_COPY(n) DatumGetVarBitPCopy(PG_GETARG_DATUM(n))
#define PG_RETURN_VARBIT_P(x) return VarBitPGetDatum(x)
/* Header overhead *in addition to* VARHDRSZ */
#define VARBITHDRSZ sizeof(int32)
/* Number of bits in this bit string */
#define VARBITLEN(PTR) (((VarBit *) (PTR))->bit_len)
/* Pointer to the first byte containing bit string data */
#define VARBITS(PTR) (((VarBit *) (PTR))->bit_dat)
/* Number of bytes in the data section of a bit string */
#define VARBITBYTES(PTR) (VARSIZE(PTR) - VARHDRSZ - VARBITHDRSZ)
/* Padding of the bit string at the end (in bits) */
#define VARBITPAD(PTR) (VARBITBYTES(PTR)*BITS_PER_BYTE - VARBITLEN(PTR))
/* Number of bytes needed to store a bit string of a given length */
#define VARBITTOTALLEN(BITLEN) (((BITLEN) + BITS_PER_BYTE-1)/BITS_PER_BYTE + \
VARHDRSZ + VARBITHDRSZ)
/*
* Maximum number of bits. Several code sites assume no overflow from
* computing bitlen + X; VARBITTOTALLEN() has the largest such X.
*/
#define VARBITMAXLEN (INT_MAX - BITS_PER_BYTE + 1)
/* pointer beyond the end of the bit string (like end() in STL containers) */
#define VARBITEND(PTR) (((bits8 *) (PTR)) + VARSIZE(PTR))
/* Mask that will cover exactly one byte, i.e. BITS_PER_BYTE bits */
#define BITMASK 0xFF
extern Datum bit_in(PG_FUNCTION_ARGS);
extern Datum bit_out(PG_FUNCTION_ARGS);
extern Datum bit_recv(PG_FUNCTION_ARGS);
extern Datum bit_send(PG_FUNCTION_ARGS);
extern Datum bittypmodin(PG_FUNCTION_ARGS);
extern Datum bittypmodout(PG_FUNCTION_ARGS);
extern Datum varbit_in(PG_FUNCTION_ARGS);
extern Datum varbit_out(PG_FUNCTION_ARGS);
extern Datum varbit_recv(PG_FUNCTION_ARGS);
extern Datum varbit_send(PG_FUNCTION_ARGS);
extern Datum varbittypmodin(PG_FUNCTION_ARGS);
extern Datum varbittypmodout(PG_FUNCTION_ARGS);
extern Datum bit(PG_FUNCTION_ARGS);
extern Datum varbit_transform(PG_FUNCTION_ARGS);
extern Datum varbit(PG_FUNCTION_ARGS);
extern Datum biteq(PG_FUNCTION_ARGS);
extern Datum bitne(PG_FUNCTION_ARGS);
extern Datum bitlt(PG_FUNCTION_ARGS);
extern Datum bitle(PG_FUNCTION_ARGS);
extern Datum bitgt(PG_FUNCTION_ARGS);
extern Datum bitge(PG_FUNCTION_ARGS);
extern Datum bitcmp(PG_FUNCTION_ARGS);
/* avoid the names bitand and bitor, since they are C++ keywords */
extern Datum bit_and(PG_FUNCTION_ARGS);
extern Datum bit_or(PG_FUNCTION_ARGS);
extern Datum bitxor(PG_FUNCTION_ARGS);
extern Datum bitnot(PG_FUNCTION_ARGS);
extern Datum bitshiftleft(PG_FUNCTION_ARGS);
extern Datum bitshiftright(PG_FUNCTION_ARGS);
extern Datum bitcat(PG_FUNCTION_ARGS);
extern Datum bitsubstr(PG_FUNCTION_ARGS);
extern Datum bitsubstr_no_len(PG_FUNCTION_ARGS);
extern Datum bitoverlay(PG_FUNCTION_ARGS);
extern Datum bitoverlay_no_len(PG_FUNCTION_ARGS);
extern Datum bitlength(PG_FUNCTION_ARGS);
extern Datum bitoctetlength(PG_FUNCTION_ARGS);
extern Datum bitfromint4(PG_FUNCTION_ARGS);
extern Datum bittoint4(PG_FUNCTION_ARGS);
extern Datum bitfromint8(PG_FUNCTION_ARGS);
extern Datum bittoint8(PG_FUNCTION_ARGS);
extern Datum bitposition(PG_FUNCTION_ARGS);
extern Datum bitsetbit(PG_FUNCTION_ARGS);
extern Datum bitgetbit(PG_FUNCTION_ARGS);
#endif