btree_macaddr.c

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/*
 * contrib/btree_gist/btree_macaddr.c
 */
#include "postgres.h"

#include "btree_gist.h"
#include "btree_utils_num.h"
#include "utils/builtins.h"
#include "utils/inet.h"

typedef struct
{
    macaddr     lower;
    macaddr     upper;
    char        pad[4];         /* make struct size = sizeof(gbtreekey16) */
} macKEY;

/*
** OID ops
*/
PG_FUNCTION_INFO_V1(gbt_macad_compress);
PG_FUNCTION_INFO_V1(gbt_macad_fetch);
PG_FUNCTION_INFO_V1(gbt_macad_union);
PG_FUNCTION_INFO_V1(gbt_macad_picksplit);
PG_FUNCTION_INFO_V1(gbt_macad_consistent);
PG_FUNCTION_INFO_V1(gbt_macad_penalty);
PG_FUNCTION_INFO_V1(gbt_macad_same);


static bool
gbt_macadgt(const void *a, const void *b, FmgrInfo *flinfo)
{
    return DatumGetBool(DirectFunctionCall2(macaddr_gt, PointerGetDatum(a), PointerGetDatum(b)));
}
static bool
gbt_macadge(const void *a, const void *b, FmgrInfo *flinfo)
{
    return DatumGetBool(DirectFunctionCall2(macaddr_ge, PointerGetDatum(a), PointerGetDatum(b)));
}

static bool
gbt_macadeq(const void *a, const void *b, FmgrInfo *flinfo)
{
    return DatumGetBool(DirectFunctionCall2(macaddr_eq, PointerGetDatum(a), PointerGetDatum(b)));
}

static bool
gbt_macadle(const void *a, const void *b, FmgrInfo *flinfo)
{
    return DatumGetBool(DirectFunctionCall2(macaddr_le, PointerGetDatum(a), PointerGetDatum(b)));
}

static bool
gbt_macadlt(const void *a, const void *b, FmgrInfo *flinfo)
{
    return DatumGetBool(DirectFunctionCall2(macaddr_lt, PointerGetDatum(a), PointerGetDatum(b)));
}


static int
gbt_macadkey_cmp(const void *a, const void *b, FmgrInfo *flinfo)
{
    macKEY     *ia = (macKEY *) (((const Nsrt *) a)->t);
    macKEY     *ib = (macKEY *) (((const Nsrt *) b)->t);
    int         res;

    res = DatumGetInt32(DirectFunctionCall2(macaddr_cmp, MacaddrPGetDatum(&ia->lower), MacaddrPGetDatum(&ib->lower)));
    if (res == 0)
        return DatumGetInt32(DirectFunctionCall2(macaddr_cmp, MacaddrPGetDatum(&ia->upper), MacaddrPGetDatum(&ib->upper)));

    return res;
}


static const gbtree_ninfo tinfo =
{
    gbt_t_macad,
    sizeof(macaddr),
    16,                         /* sizeof(gbtreekey16) */
    gbt_macadgt,
    gbt_macadge,
    gbt_macadeq,
    gbt_macadle,
    gbt_macadlt,
    gbt_macadkey_cmp,
    NULL
};


/**************************************************
 * macaddr ops
 **************************************************/



static uint64
mac_2_uint64(macaddr *m)
{
    unsigned char *mi = (unsigned char *) m;
    uint64      res = 0;
    int         i;

    for (i = 0; i < 6; i++)
        res += (((uint64) mi[i]) << ((uint64) ((5 - i) * 8)));
    return res;
}



Datum
gbt_macad_compress(PG_FUNCTION_ARGS)
{
    GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);

    PG_RETURN_POINTER(gbt_num_compress(entry, &tinfo));
}

Datum
gbt_macad_fetch(PG_FUNCTION_ARGS)
{
    GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);

    PG_RETURN_POINTER(gbt_num_fetch(entry, &tinfo));
}

Datum
gbt_macad_consistent(PG_FUNCTION_ARGS)
{
    GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
    macaddr    *query = (macaddr *) PG_GETARG_POINTER(1);
    StrategyNumber strategy = (StrategyNumber) PG_GETARG_UINT16(2);

    /* Oid      subtype = PG_GETARG_OID(3); */
    bool       *recheck = (bool *) PG_GETARG_POINTER(4);
    macKEY     *kkk = (macKEY *) DatumGetPointer(entry->key);
    GBT_NUMKEY_R key;

    /* All cases served by this function are exact */
    *recheck = false;

    key.lower = (GBT_NUMKEY *) &kkk->lower;
    key.upper = (GBT_NUMKEY *) &kkk->upper;

    PG_RETURN_BOOL(gbt_num_consistent(&key, (void *) query, &strategy,
                                      GIST_LEAF(entry), &tinfo, fcinfo->flinfo));
}


Datum
gbt_macad_union(PG_FUNCTION_ARGS)
{
    GistEntryVector *entryvec = (GistEntryVector *) PG_GETARG_POINTER(0);
    void       *out = palloc0(sizeof(macKEY));

    *(int *) PG_GETARG_POINTER(1) = sizeof(macKEY);
    PG_RETURN_POINTER(gbt_num_union((void *) out, entryvec, &tinfo, fcinfo->flinfo));
}


Datum
gbt_macad_penalty(PG_FUNCTION_ARGS)
{
    macKEY     *origentry = (macKEY *) DatumGetPointer(((GISTENTRY *) PG_GETARG_POINTER(0))->key);
    macKEY     *newentry = (macKEY *) DatumGetPointer(((GISTENTRY *) PG_GETARG_POINTER(1))->key);
    float      *result = (float *) PG_GETARG_POINTER(2);
    uint64      iorg[2],
                inew[2];

    iorg[0] = mac_2_uint64(&origentry->lower);
    iorg[1] = mac_2_uint64(&origentry->upper);
    inew[0] = mac_2_uint64(&newentry->lower);
    inew[1] = mac_2_uint64(&newentry->upper);

    penalty_num(result, iorg[0], iorg[1], inew[0], inew[1]);

    PG_RETURN_POINTER(result);

}

Datum
gbt_macad_picksplit(PG_FUNCTION_ARGS)
{
    PG_RETURN_POINTER(gbt_num_picksplit((GistEntryVector *) PG_GETARG_POINTER(0),
                                        (GIST_SPLITVEC *) PG_GETARG_POINTER(1),
                                        &tinfo, fcinfo->flinfo));
}

Datum
gbt_macad_same(PG_FUNCTION_ARGS)
{
    macKEY     *b1 = (macKEY *) PG_GETARG_POINTER(0);
    macKEY     *b2 = (macKEY *) PG_GETARG_POINTER(1);
    bool       *result = (bool *) PG_GETARG_POINTER(2);

    *result = gbt_num_same((void *) b1, (void *) b2, &tinfo, fcinfo->flinfo);
    PG_RETURN_POINTER(result);
}