PostGIS  2.2.8dev-r@@SVN_REVISION@@

◆ lwcircstring_from_gserialized_buffer()

static LWCIRCSTRING* lwcircstring_from_gserialized_buffer ( uint8_t *  data_ptr,
uint8_t  g_flags,
size_t *  g_size 
)
static

Definition at line 1127 of file g_serialized.c.

References LWCIRCSTRING::bbox, CIRCSTRINGTYPE, LWCIRCSTRING::flags, FLAGS_GET_M, FLAGS_GET_Z, FLAGS_NDIMS, lw_get_uint32_t(), lwalloc(), LWCIRCSTRING::points, ptarray_construct(), ptarray_construct_reference_data(), LWCIRCSTRING::srid, SRID_UNKNOWN, and LWCIRCSTRING::type.

Referenced by lwgeom_from_gserialized_buffer().

1128 {
1129  uint8_t *start_ptr = data_ptr;
1130  LWCIRCSTRING *circstring;
1131  uint32_t npoints = 0;
1132 
1133  assert(data_ptr);
1134 
1135  circstring = (LWCIRCSTRING*)lwalloc(sizeof(LWCIRCSTRING));
1136  circstring->srid = SRID_UNKNOWN; /* Default */
1137  circstring->bbox = NULL;
1138  circstring->type = CIRCSTRINGTYPE;
1139  circstring->flags = g_flags;
1140 
1141  data_ptr += 4; /* Skip past the circstringtype. */
1142  npoints = lw_get_uint32_t(data_ptr); /* Zero => empty geometry */
1143  data_ptr += 4; /* Skip past the npoints. */
1144 
1145  if ( npoints > 0 )
1146  circstring->points = ptarray_construct_reference_data(FLAGS_GET_Z(g_flags), FLAGS_GET_M(g_flags), npoints, data_ptr);
1147  else
1148  circstring->points = ptarray_construct(FLAGS_GET_Z(g_flags), FLAGS_GET_M(g_flags), 0); /* Empty circularstring */
1149 
1150  data_ptr += FLAGS_NDIMS(g_flags) * npoints * sizeof(double);
1151 
1152  if ( g_size )
1153  *g_size = data_ptr - start_ptr;
1154 
1155  return circstring;
1156 }
POINTARRAY * ptarray_construct(char hasz, char hasm, uint32_t npoints)
Construct an empty pointarray, allocating storage and setting the npoints, but not filling in any inf...
Definition: ptarray.c:62
uint8_t flags
Definition: liblwgeom.h:425
int32_t srid
Definition: liblwgeom.h:427
uint32_t lw_get_uint32_t(const uint8_t *loc)
Definition: lwgeom_api.c:569
#define SRID_UNKNOWN
Unknown SRID value.
Definition: liblwgeom.h:172
uint8_t type
Definition: liblwgeom.h:424
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
#define FLAGS_GET_Z(flags)
Macros for manipulating the 'flags' byte.
Definition: liblwgeom.h:124
GBOX * bbox
Definition: liblwgeom.h:426
#define FLAGS_GET_M(flags)
Definition: liblwgeom.h:125
tuple g_size
Definition: genraster.py:41
POINTARRAY * points
Definition: liblwgeom.h:428
#define CIRCSTRINGTYPE
Definition: liblwgeom.h:77
void * lwalloc(size_t size)
Definition: lwutil.c:199
#define FLAGS_NDIMS(flags)
Definition: liblwgeom.h:136
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