lwgeom_hash()

Datum lwgeom_hash

(

PG_FUNCTION_ARGS

)

Definition at line 132 of file lwgeom_btree.c.

{
        Datum hval;
        GSERIALIZED *g1 = PG_GETARG_GSERIALIZED_P(0);
        /* Point to just the type/coordinate part of buffer */
        size_t hsz1 = gserialized_header_size(g1);
        uint8_t *b1 = (uint8_t*)g1 + hsz1;
        /* Calculate size of type/coordinate buffer */
        size_t sz1 = VARSIZE(g1);
        size_t bsz1 = sz1 - hsz1;
        /* Calculate size of srid/type/coordinate buffer */
        int srid = gserialized_get_srid(g1);
        size_t bsz2 = bsz1 + sizeof(int);
        uint8_t *b2 = palloc(bsz2);
        /* Copy srid into front of combined buffer */
        memcpy(b2, &srid, sizeof(int));
        /* Copy type/coordinates into rest of combined buffer */
        memcpy(b2+sizeof(int), b1, bsz1);
        /* Hash combined buffer */
        hval = hash_any(b2, bsz2);
        pfree(b2);
        PG_FREE_IF_COPY(g1, 0);
        PG_RETURN_DATUM(hval);
}

References gserialized_get_srid(), and gserialized_header_size().

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