PostGIS  2.3.7dev-r@@SVN_REVISION@@
static LWPOLY* lwpoly_from_gserialized_buffer ( uint8_t *  data_ptr,
uint8_t  g_flags,
size_t *  g_size 
)
static

Definition at line 1068 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().

1069 {
1070  uint8_t *start_ptr = data_ptr;
1071  LWPOLY *poly;
1072  uint8_t *ordinate_ptr;
1073  uint32_t nrings = 0;
1074  int i = 0;
1075 
1076  assert(data_ptr);
1077 
1078  poly = (LWPOLY*)lwalloc(sizeof(LWPOLY));
1079  poly->srid = SRID_UNKNOWN; /* Default */
1080  poly->bbox = NULL;
1081  poly->type = POLYGONTYPE;
1082  poly->flags = g_flags;
1083 
1084  data_ptr += 4; /* Skip past the polygontype. */
1085  nrings = lw_get_uint32_t(data_ptr); /* Zero => empty geometry */
1086  poly->nrings = nrings;
1087  LWDEBUGF(4, "nrings = %d", nrings);
1088  data_ptr += 4; /* Skip past the nrings. */
1089 
1090  ordinate_ptr = data_ptr; /* Start the ordinate pointer. */
1091  if ( nrings > 0)
1092  {
1093  poly->rings = (POINTARRAY**)lwalloc( sizeof(POINTARRAY*) * nrings );
1094  ordinate_ptr += nrings * 4; /* Move past all the npoints values. */
1095  if ( nrings % 2 ) /* If there is padding, move past that too. */
1096  ordinate_ptr += 4;
1097  }
1098  else /* Empty polygon */
1099  {
1100  poly->rings = NULL;
1101  }
1102 
1103  for ( i = 0; i < nrings; i++ )
1104  {
1105  uint32_t npoints = 0;
1106 
1107  /* Read in the number of points. */
1108  npoints = lw_get_uint32_t(data_ptr);
1109  data_ptr += 4;
1110 
1111  /* Make a point array for the ring, and move the ordinate pointer past the ring ordinates. */
1112  poly->rings[i] = ptarray_construct_reference_data(FLAGS_GET_Z(g_flags), FLAGS_GET_M(g_flags), npoints, ordinate_ptr);
1113 
1114  ordinate_ptr += sizeof(double) * FLAGS_NDIMS(g_flags) * npoints;
1115  }
1116 
1117  if ( g_size )
1118  *g_size = ordinate_ptr - start_ptr;
1119 
1120  return poly;
1121 }
#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 'flags' 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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