lwcollection_from_gserialized2_buffer()

static LWCOLLECTION * lwcollection_from_gserialized2_buffer ( uint8_t *  data_ptr, lwflags_t  lwflags, size_t *  size  )

static

Definition at line 1451 of file gserialized2.c.

{
        uint32_t type;
        uint8_t *start_ptr = data_ptr;
        LWCOLLECTION *collection;
        uint32_t ngeoms = 0;
        uint32_t i = 0;
 
        assert(data_ptr);
 
        type = gserialized2_get_uint32_t(data_ptr);
        data_ptr += 4; /* Skip past the type. */
 
        collection = (LWCOLLECTION*)lwalloc(sizeof(LWCOLLECTION));
        collection->srid = SRID_UNKNOWN; /* Default */
        collection->bbox = NULL;
        collection->type = type;
        collection->flags = lwflags;
 
        ngeoms = gserialized2_get_uint32_t(data_ptr);
        collection->ngeoms = ngeoms; /* Zero => empty geometry */
        data_ptr += 4; /* Skip past the ngeoms. */
 
        if (ngeoms > 0)
        {
                collection->geoms = lwalloc(sizeof(LWGEOM*) * ngeoms);
                collection->maxgeoms = ngeoms;
        }
        else
        {
                collection->geoms = NULL;
                collection->maxgeoms = 0;
        }
 
        /* Sub-geometries are never de-serialized with boxes (#1254) */
        FLAGS_SET_BBOX(lwflags, 0);
 
        for (i = 0; i < ngeoms; i++)
        {
                uint32_t subtype = gserialized2_get_uint32_t(data_ptr);
                size_t subsize = 0;
 
                if (!lwcollection_allows_subtype(type, subtype))
                {
                        lwerror("Invalid subtype (%s) for collection type (%s)", lwtype_name(subtype), lwtype_name(type));
                        lwfree(collection);
                        return NULL;
                }
                collection->geoms[i] = lwgeom_from_gserialized2_buffer(data_ptr, lwflags, &subsize);
                data_ptr += subsize;
        }
 
        if (size)
                *size = data_ptr - start_ptr;
 
        return collection;
}

References LWCOLLECTION::bbox, LWCOLLECTION::flags, FLAGS_SET_BBOX, LWCOLLECTION::geoms, gserialized2_get_uint32_t(), lwalloc(), lwcollection_allows_subtype(), lwerror(), lwflags(), lwfree(), lwgeom_from_gserialized2_buffer(), lwtype_name(), LWCOLLECTION::maxgeoms, LWCOLLECTION::ngeoms, LWCOLLECTION::srid, SRID_UNKNOWN, and LWCOLLECTION::type.

Referenced by lwgeom_from_gserialized2_buffer().

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