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varbit.h
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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