gserialized2_get_srid()

int32_t gserialized2_get_srid

(

const GSERIALIZED *

g

)

Extract the SRID from the serialized form (it is packed into three bytes so this is a handy function).

Definition at line 190 of file gserialized2.c.

{
        int32_t srid = 0;
        srid = srid | (g->srid[0] << 16);
        srid = srid | (g->srid[1] << 8);
        srid = srid | (g->srid[2]);
        /* Only the first 21 bits are set. Slide up and back to pull
           the negative bits down, if we need them. */
        srid = (srid<<11)>>11;
 
        /* 0 is our internal unknown value. We'll map back and forth here for now */
        if (srid == 0)
                return SRID_UNKNOWN;
        else
                return srid;
}

References GSERIALIZED::srid, and SRID_UNKNOWN.

Referenced by gserialized2_hash(), gserialized_get_srid(), lwgeom_from_gserialized2(), and test_gserialized2_srid().

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