PostGIS  2.3.8dev-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 1070 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().

1071 {
1072  uint8_t *start_ptr = data_ptr;
1073  LWPOLY *poly;
1074  uint8_t *ordinate_ptr;
1075  uint32_t nrings = 0;
1076  int i = 0;
1077 
1078  assert(data_ptr);
1079 
1080  poly = (LWPOLY*)lwalloc(sizeof(LWPOLY));
1081  poly->srid = SRID_UNKNOWN; /* Default */
1082  poly->bbox = NULL;
1083  poly->type = POLYGONTYPE;
1084  poly->flags = g_flags;
1085 
1086  data_ptr += 4; /* Skip past the polygontype. */
1087  nrings = lw_get_uint32_t(data_ptr); /* Zero => empty geometry */
1088  poly->nrings = nrings;
1089  LWDEBUGF(4, "nrings = %d", nrings);
1090  data_ptr += 4; /* Skip past the nrings. */
1091 
1092  ordinate_ptr = data_ptr; /* Start the ordinate pointer. */
1093  if ( nrings > 0)
1094  {
1095  poly->rings = (POINTARRAY**)lwalloc( sizeof(POINTARRAY*) * nrings );
1096  ordinate_ptr += nrings * 4; /* Move past all the npoints values. */
1097  if ( nrings % 2 ) /* If there is padding, move past that too. */
1098  ordinate_ptr += 4;
1099  }
1100  else /* Empty polygon */
1101  {
1102  poly->rings = NULL;
1103  }
1104 
1105  for ( i = 0; i < nrings; i++ )
1106  {
1107  uint32_t npoints = 0;
1108 
1109  /* Read in the number of points. */
1110  npoints = lw_get_uint32_t(data_ptr);
1111  data_ptr += 4;
1112 
1113  /* Make a point array for the ring, and move the ordinate pointer past the ring ordinates. */
1114  poly->rings[i] = ptarray_construct_reference_data(FLAGS_GET_Z(g_flags), FLAGS_GET_M(g_flags), npoints, ordinate_ptr);
1115 
1116  ordinate_ptr += sizeof(double) * FLAGS_NDIMS(g_flags) * npoints;
1117  }
1118 
1119  if ( g_size )
1120  *g_size = ordinate_ptr - start_ptr;
1121 
1122  return poly;
1123 }
#define POLYGONTYPE
Definition: liblwgeom.h:86
GBOX * bbox
Definition: liblwgeom.h:452
uint32_t lw_get_uint32_t(const uint8_t *loc)
Definition: lwgeom_api.c:582
uint8_t type
Definition: liblwgeom.h:450
#define SRID_UNKNOWN
Unknown SRID value.
Definition: liblwgeom.h:187
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:456
int nrings
Definition: liblwgeom.h:454
#define FLAGS_GET_Z(flags)
Macros for manipulating the &#39;flags&#39; byte.
Definition: liblwgeom.h:139
int32_t srid
Definition: liblwgeom.h:453
#define FLAGS_GET_M(flags)
Definition: liblwgeom.h:140
tuple g_size
Definition: genraster.py:41
uint8_t flags
Definition: liblwgeom.h:451
void * lwalloc(size_t size)
Definition: lwutil.c:227
#define LWDEBUGF(level, msg,...)
Definition: lwgeom_log.h:88
#define FLAGS_NDIMS(flags)
Definition: liblwgeom.h:151
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