gserialized2_is_empty_recurse()

static size_t gserialized2_is_empty_recurse ( const uint8_t *  p, int *  isempty  )

static

Definition at line 224 of file gserialized2.c.

{
        uint32_t type = 0, num = 0;
 
        /* Short circuit if we found any non-empty component */
        if (!*isempty) return 0;
 
        memcpy(&type, p, 4);
        memcpy(&num, p+4, 4);
 
        if (lwtype_is_collection(type))
        {
                /* Recurse into collections */
                size_t lz = 8;
                for ( uint32_t i = 0; i < num; i++ )
                {
                        lz += gserialized2_is_empty_recurse(p+lz, isempty);
                        if (!*isempty)
                                return lz;
                }
                *isempty = LW_TRUE;
                return lz;
        }
        else
        {
                size_t lz = 8;
                /* Any non-collection with zero elements is empty */
                if ( num == 0 )
                {
                        *isempty = LW_TRUE;
                }
                /*
                 * Special case to handle polygon with a non-zero
                 * set of empty rings
                 * https://trac.osgeo.org/postgis/ticket/6028
                 */
                else if ( num > 0 && type == POLYGONTYPE )
                {
                        for ( uint32_t i = 0; i < num; i++ )
                        {
                                uint32_t lrnum;
                                memcpy(&lrnum, p+lz, 4);
                                lz += 4;
                                if ( lrnum > 0 )
                                {
                                        *isempty = LW_FALSE;
                                        return lz;
                                }
                        }
                        *isempty = LW_TRUE;
                }
                /* Any other non-collection with more than zero elements is not empty */
                else
                {
                        *isempty = LW_FALSE;
                }
                return lz;
        }
}

References gserialized2_is_empty_recurse(), LW_FALSE, LW_TRUE, lwtype_is_collection(), and POLYGONTYPE.

Referenced by gserialized2_is_empty(), and gserialized2_is_empty_recurse().

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