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Sourcecode: postgresql-8.4 version File versions  Download package

hstore.h

/*
 * $PostgreSQL: pgsql/contrib/hstore/hstore.h,v 1.8 2009/06/11 14:48:51 momjian Exp $
 */
#ifndef __HSTORE_H__
#define __HSTORE_H__

#include "fmgr.h"


typedef struct
{
      uint16            keylen;
      uint16            vallen;
      uint32
                        valisnull:1,
                        pos:31;
} HEntry;

/* these are determined by the sizes of the keylen and vallen fields */
/* in struct HEntry and struct Pairs */
#define HSTORE_MAX_KEY_LEN 65535
#define HSTORE_MAX_VALUE_LEN 65535


typedef struct
{
      int32       vl_len_;          /* varlena header (do not touch directly!) */
      int4        size;
      char        data[1];
} HStore;

#define HSHRDSIZE (VARHDRSZ + sizeof(int4))
#define CALCDATASIZE(x, lenstr) ( (x) * sizeof(HEntry) + HSHRDSIZE + (lenstr) )
#define ARRPTR(x)       ( (HEntry*) ( (char*)(x) + HSHRDSIZE ) )
#define STRPTR(x)       ( (char*)(x) + HSHRDSIZE + ( sizeof(HEntry) * ((HStore*)x)->size ) )


#define PG_GETARG_HS(x) ((HStore*)PG_DETOAST_DATUM(PG_GETARG_DATUM(x)))

typedef struct
{
      char     *key;
      char     *val;
      uint16            keylen;
      uint16            vallen;
      bool        isnull;
      bool        needfree;
} Pairs;

int               comparePairs(const void *a, const void *b);
int               uniquePairs(Pairs *a, int4 l, int4 *buflen);

size_t            hstoreCheckKeyLen(size_t len);
size_t            hstoreCheckValLen(size_t len);

#define HStoreContainsStrategyNumber      7
#define HStoreExistsStrategyNumber        9

#endif   /* __HSTORE_H__ */

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