PostGIS  2.3.8dev-r@@SVN_REVISION@@

◆ lwline_from_gserialized_buffer()

static LWLINE* lwline_from_gserialized_buffer ( uint8_t *  data_ptr,
uint8_t  g_flags,
size_t *  g_size 
)
static

Definition at line 1038 of file g_serialized.c.

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

Referenced by lwgeom_from_gserialized_buffer().

1039 {
1040  uint8_t *start_ptr = data_ptr;
1041  LWLINE *line;
1042  uint32_t npoints = 0;
1043 
1044  assert(data_ptr);
1045 
1046  line = (LWLINE*)lwalloc(sizeof(LWLINE));
1047  line->srid = SRID_UNKNOWN; /* Default */
1048  line->bbox = NULL;
1049  line->type = LINETYPE;
1050  line->flags = g_flags;
1051 
1052  data_ptr += 4; /* Skip past the type. */
1053  npoints = lw_get_uint32_t(data_ptr); /* Zero => empty geometry */
1054  data_ptr += 4; /* Skip past the npoints. */
1055 
1056  if ( npoints > 0 )
1057  line->points = ptarray_construct_reference_data(FLAGS_GET_Z(g_flags), FLAGS_GET_M(g_flags), npoints, data_ptr);
1058 
1059  else
1060  line->points = ptarray_construct(FLAGS_GET_Z(g_flags), FLAGS_GET_M(g_flags), 0); /* Empty linestring */
1061 
1062  data_ptr += FLAGS_NDIMS(g_flags) * npoints * sizeof(double);
1063 
1064  if ( g_size )
1065  *g_size = data_ptr - start_ptr;
1066 
1067  return line;
1068 }
#define LINETYPE
Definition: liblwgeom.h:85
uint8_t type
Definition: liblwgeom.h:417
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
GBOX * bbox
Definition: liblwgeom.h:419
int32_t srid
Definition: liblwgeom.h:420
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
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
#define FLAGS_GET_M(flags)
Definition: liblwgeom.h:140
tuple g_size
Definition: genraster.py:41
void * lwalloc(size_t size)
Definition: lwutil.c:227
uint8_t flags
Definition: liblwgeom.h:418
#define FLAGS_NDIMS(flags)
Definition: liblwgeom.h:151
POINTARRAY * points
Definition: liblwgeom.h:421
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