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Initial commit of an arbitrary precision unsigned integer data type with
bitwise operators.

The following operators are implemented so far (not optimally, but I'm not
worried about that yet):
& (bitwise and)
| (bitwise or)
^ (bitwise xor)
<< (bitwise left shift)
>> (bitwise right shift)
+ (arithmetic add)
- (arithmetic subtract)
* (arithmetic multiply)

I plan to implement comparison operators and division next.

#ifndef VARINT_H
#define VARINT_H

#include "fmgr.h"

/*
 * Modeled on struct varlena from postgres.h, but data type is uint32.
 */
typedef struct
{
	int32		vl_len_;		/* varlena header (do not touch directly!) */
	int32		bit_len;		/* number of valid bits */
	uint32		bit_dat[1];		/* bit string, least sig. uint32 first */
} VarInt;

/*
 * 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 DatumGetVarIntP(X)		   ((VarInt *) PG_DETOAST_DATUM(X))
#define DatumGetVarIntPCopy(X)	   ((VarInt *) PG_DETOAST_DATUM_COPY(X))
#define VarIntPGetDatum(X)		   PointerGetDatum(X)
#define PG_GETARG_VARINT_P(n)	   DatumGetVarIntP(PG_GETARG_DATUM(n))
#define PG_GETARG_VARINT_P_COPY(n) DatumGetVarIntPCopy(PG_GETARG_DATUM(n))
#define PG_RETURN_VARINT_P(x)	   return VarIntPGetDatum(x)

extern Datum varint_in(PG_FUNCTION_ARGS);
extern Datum varint_out(PG_FUNCTION_ARGS);
extern Datum varinttypmodin(PG_FUNCTION_ARGS);
extern Datum varinttypmodout(PG_FUNCTION_ARGS);
extern Datum varintand(PG_FUNCTION_ARGS);
extern Datum varintor(PG_FUNCTION_ARGS);
extern Datum varintxor(PG_FUNCTION_ARGS);
extern Datum varintadd(PG_FUNCTION_ARGS);
extern Datum varintsub(PG_FUNCTION_ARGS);
extern Datum varintmul(PG_FUNCTION_ARGS);
extern Datum varintnot(PG_FUNCTION_ARGS);
extern Datum varintshl(PG_FUNCTION_ARGS);
extern Datum varintshr(PG_FUNCTION_ARGS);
#if 0
extern Datum varint_recv(PG_FUNCTION_ARGS);
extern Datum varint_send(PG_FUNCTION_ARGS);
extern Datum varint(PG_FUNCTION_ARGS);
#endif

#endif