gserialized1_get_srid()

int32_t gserialized1_get_srid

(

const GSERIALIZED *

s

)

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

Definition at line 142 of file gserialized1.c.

{
        int32_t srid = 0;
        srid = srid | (s->srid[0] << 16);
        srid = srid | (s->srid[1] << 8);
        srid = srid | s->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 s, and SRID_UNKNOWN.

Referenced by gserialized1_hash(), gserialized_get_srid(), lwgeom_from_gserialized1(), and test_serialized1_srid().

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