PostGIS  2.3.8dev-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 1154 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().

1155 {
1156  uint8_t *start_ptr = data_ptr;
1157  LWCIRCSTRING *circstring;
1158  uint32_t npoints = 0;
1159 
1160  assert(data_ptr);
1161 
1162  circstring = (LWCIRCSTRING*)lwalloc(sizeof(LWCIRCSTRING));
1163  circstring->srid = SRID_UNKNOWN; /* Default */
1164  circstring->bbox = NULL;
1165  circstring->type = CIRCSTRINGTYPE;
1166  circstring->flags = g_flags;
1167 
1168  data_ptr += 4; /* Skip past the circstringtype. */
1169  npoints = lw_get_uint32_t(data_ptr); /* Zero => empty geometry */
1170  data_ptr += 4; /* Skip past the npoints. */
1171 
1172  if ( npoints > 0 )
1173  circstring->points = ptarray_construct_reference_data(FLAGS_GET_Z(g_flags), FLAGS_GET_M(g_flags), npoints, data_ptr);
1174  else
1175  circstring->points = ptarray_construct(FLAGS_GET_Z(g_flags), FLAGS_GET_M(g_flags), 0); /* Empty circularstring */
1176 
1177  data_ptr += FLAGS_NDIMS(g_flags) * npoints * sizeof(double);
1178 
1179  if ( g_size )
1180  *g_size = data_ptr - start_ptr;
1181 
1182  return circstring;
1183 }
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:440
int32_t srid
Definition: liblwgeom.h:442
uint32_t lw_get_uint32_t(const uint8_t *loc)
Definition: lwgeom_api.c:582
#define SRID_UNKNOWN
Unknown SRID value.
Definition: liblwgeom.h:187
uint8_t type
Definition: liblwgeom.h:439
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:139
GBOX * bbox
Definition: liblwgeom.h:441
#define FLAGS_GET_M(flags)
Definition: liblwgeom.h:140
tuple g_size
Definition: genraster.py:41
POINTARRAY * points
Definition: liblwgeom.h:443
#define CIRCSTRINGTYPE
Definition: liblwgeom.h:91
void * lwalloc(size_t size)
Definition: lwutil.c:227
#define FLAGS_NDIMS(flags)
Definition: liblwgeom.h:151
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