PostGIS  2.2.8dev-r@@SVN_REVISION@@

◆ lwpoly_from_gserialized_buffer()

static LWPOLY* lwpoly_from_gserialized_buffer ( uint8_t *  data_ptr,
uint8_t  g_flags,
size_t *  g_size 
)
static

Definition at line 1041 of file g_serialized.c.

References LWPOLY::bbox, LWPOLY::flags, FLAGS_GET_M, FLAGS_GET_Z, FLAGS_NDIMS, lw_get_uint32_t(), lwalloc(), LWDEBUGF, LWPOLY::nrings, POLYGONTYPE, ptarray_construct_reference_data(), LWPOLY::rings, LWPOLY::srid, SRID_UNKNOWN, and LWPOLY::type.

Referenced by lwgeom_from_gserialized_buffer().

1042 {
1043  uint8_t *start_ptr = data_ptr;
1044  LWPOLY *poly;
1045  uint8_t *ordinate_ptr;
1046  uint32_t nrings = 0;
1047  int i = 0;
1048 
1049  assert(data_ptr);
1050 
1051  poly = (LWPOLY*)lwalloc(sizeof(LWPOLY));
1052  poly->srid = SRID_UNKNOWN; /* Default */
1053  poly->bbox = NULL;
1054  poly->type = POLYGONTYPE;
1055  poly->flags = g_flags;
1056 
1057  data_ptr += 4; /* Skip past the polygontype. */
1058  nrings = lw_get_uint32_t(data_ptr); /* Zero => empty geometry */
1059  poly->nrings = nrings;
1060  LWDEBUGF(4, "nrings = %d", nrings);
1061  data_ptr += 4; /* Skip past the nrings. */
1062 
1063  ordinate_ptr = data_ptr; /* Start the ordinate pointer. */
1064  if ( nrings > 0)
1065  {
1066  poly->rings = (POINTARRAY**)lwalloc( sizeof(POINTARRAY*) * nrings );
1067  ordinate_ptr += nrings * 4; /* Move past all the npoints values. */
1068  if ( nrings % 2 ) /* If there is padding, move past that too. */
1069  ordinate_ptr += 4;
1070  }
1071  else /* Empty polygon */
1072  {
1073  poly->rings = NULL;
1074  }
1075 
1076  for ( i = 0; i < nrings; i++ )
1077  {
1078  uint32_t npoints = 0;
1079 
1080  /* Read in the number of points. */
1081  npoints = lw_get_uint32_t(data_ptr);
1082  data_ptr += 4;
1083 
1084  /* Make a point array for the ring, and move the ordinate pointer past the ring ordinates. */
1085  poly->rings[i] = ptarray_construct_reference_data(FLAGS_GET_Z(g_flags), FLAGS_GET_M(g_flags), npoints, ordinate_ptr);
1086 
1087  ordinate_ptr += sizeof(double) * FLAGS_NDIMS(g_flags) * npoints;
1088  }
1089 
1090  if ( g_size )
1091  *g_size = ordinate_ptr - start_ptr;
1092 
1093  return poly;
1094 }
#define POLYGONTYPE
Definition: liblwgeom.h:72
GBOX * bbox
Definition: liblwgeom.h:437
uint32_t lw_get_uint32_t(const uint8_t *loc)
Definition: lwgeom_api.c:569
uint8_t type
Definition: liblwgeom.h:435
#define SRID_UNKNOWN
Unknown SRID value.
Definition: liblwgeom.h:172
POINTARRAY * ptarray_construct_reference_data(char hasz, char hasm, uint32_t npoints, uint8_t *ptlist)
Construct a new POINTARRAY, referencing to the data from ptlist.
Definition: ptarray.c:295
POINTARRAY ** rings
Definition: liblwgeom.h:441
int nrings
Definition: liblwgeom.h:439
#define FLAGS_GET_Z(flags)
Macros for manipulating the &#39;flags&#39; byte.
Definition: liblwgeom.h:124
int32_t srid
Definition: liblwgeom.h:438
#define FLAGS_GET_M(flags)
Definition: liblwgeom.h:125
tuple g_size
Definition: genraster.py:41
uint8_t flags
Definition: liblwgeom.h:436
void * lwalloc(size_t size)
Definition: lwutil.c:199
#define LWDEBUGF(level, msg,...)
Definition: lwgeom_log.h:55
#define FLAGS_NDIMS(flags)
Definition: liblwgeom.h:136
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