PostGIS  2.1.10dev-r@@SVN_REVISION@@
Datum LWGEOM_in ( PG_FUNCTION_ARGS  )

Definition at line 48 of file lwgeom_inout.c.

References bytes_from_hexbytes(), struct_lwgeom_parser_result::geom, geometry_serialize(), input(), LW_FAILURE, LW_PARSER_CHECK_ALL, LW_PARSER_CHECK_NONE, lwgeom_add_bbox(), lwgeom_free(), lwgeom_from_wkb(), lwgeom_needs_bbox(), lwgeom_parse_wkt(), lwgeom_parser_result_free(), lwgeom_parser_result_init(), lwgeom_set_srid(), and postgis_valid_typmod().

Referenced by parse_WKT_lwgeom().

49 {
50  char *input = PG_GETARG_CSTRING(0);
51  int32 geom_typmod = -1;
52  char *str = input;
53  LWGEOM_PARSER_RESULT lwg_parser_result;
54  LWGEOM *lwgeom;
55  GSERIALIZED *ret;
56  int srid = 0;
57 
58  if ( (PG_NARGS()>2) && (!PG_ARGISNULL(2)) ) {
59  geom_typmod = PG_GETARG_INT32(2);
60  }
61 
62  lwgeom_parser_result_init(&lwg_parser_result);
63 
64  /* Empty string. */
65  if ( str[0] == '\0' ) {
66  ereport(ERROR,(errmsg("parse error - invalid geometry")));
67  PG_RETURN_NULL();
68  }
69 
70  /* Starts with "SRID=" */
71  if( strncasecmp(str,"SRID=",5) == 0 )
72  {
73  /* Roll forward to semi-colon */
74  char *tmp = str;
75  while ( tmp && *tmp != ';' )
76  tmp++;
77 
78  /* Check next character to see if we have WKB */
79  if ( tmp && *(tmp+1) == '0' )
80  {
81  /* Null terminate the SRID= string */
82  *tmp = '\0';
83  /* Set str to the start of the real WKB */
84  str = tmp + 1;
85  /* Move tmp to the start of the numeric part */
86  tmp = input + 5;
87  /* Parse out the SRID number */
88  srid = atoi(tmp);
89  }
90  }
91 
92  /* WKB? Let's find out. */
93  if ( str[0] == '0' )
94  {
95  size_t hexsize = strlen(str);
96  unsigned char *wkb = bytes_from_hexbytes(str, hexsize);
97  /* TODO: 20101206: No parser checks! This is inline with current 1.5 behavior, but needs discussion */
98  lwgeom = lwgeom_from_wkb(wkb, hexsize/2, LW_PARSER_CHECK_NONE);
99  /* If we picked up an SRID at the head of the WKB set it manually */
100  if ( srid ) lwgeom_set_srid(lwgeom, srid);
101  /* Add a bbox if necessary */
102  if ( lwgeom_needs_bbox(lwgeom) ) lwgeom_add_bbox(lwgeom);
103  pfree(wkb);
104  ret = geometry_serialize(lwgeom);
105  lwgeom_free(lwgeom);
106  }
107  /* WKT then. */
108  else
109  {
110  if ( lwgeom_parse_wkt(&lwg_parser_result, str, LW_PARSER_CHECK_ALL) == LW_FAILURE )
111  {
112  PG_PARSER_ERROR(lwg_parser_result);
113  PG_RETURN_NULL();
114  }
115  lwgeom = lwg_parser_result.geom;
116  if ( lwgeom_needs_bbox(lwgeom) )
117  lwgeom_add_bbox(lwgeom);
118  ret = geometry_serialize(lwgeom);
119  lwgeom_parser_result_free(&lwg_parser_result);
120  }
121 
122  if ( geom_typmod >= 0 )
123  {
124  ret = postgis_valid_typmod(ret, geom_typmod);
125  POSTGIS_DEBUG(3, "typmod and geometry were consistent");
126  }
127  else
128  {
129  POSTGIS_DEBUG(3, "typmod was -1");
130  }
131 
132  /* Don't free the parser result (and hence lwgeom) until we have done */
133  /* the typemod check with lwgeom */
134 
135  PG_RETURN_POINTER(ret);
136 
137 }
GSERIALIZED * postgis_valid_typmod(GSERIALIZED *gser, int32_t typmod)
Check the consistency of the metadata we want to enforce in the typmod: srid, type and dimensionality...
uint8_t * bytes_from_hexbytes(const char *hexbuf, size_t hexsize)
Definition: lwin_wkb.c:69
void lwgeom_free(LWGEOM *geom)
Definition: lwgeom.c:1006
void lwgeom_parser_result_free(LWGEOM_PARSER_RESULT *parser_result)
Definition: lwin_wkt.c:825
static int input(void)
#define LW_FAILURE
Definition: liblwgeom.h:54
#define LW_PARSER_CHECK_NONE
Definition: liblwgeom.h:1706
int lwgeom_parse_wkt(LWGEOM_PARSER_RESULT *parser_result, char *wktstr, int parse_flags)
Parse a WKT geometry string into an LWGEOM structure.
Parser result structure: returns the result of attempting to convert (E)WKT/(E)WKB to LWGEOM...
Definition: liblwgeom.h:1713
GSERIALIZED * geometry_serialize(LWGEOM *lwgeom)
void lwgeom_parser_result_init(LWGEOM_PARSER_RESULT *parser_result)
Definition: lwin_wkt.c:819
void lwgeom_add_bbox(LWGEOM *lwgeom)
Compute a bbox if not already computed.
Definition: lwgeom.c:555
void lwgeom_set_srid(LWGEOM *geom, int srid)
Set the SRID on an LWGEOM For collections, only the parent gets an SRID, all the children get SRID_UN...
#define LW_PARSER_CHECK_ALL
Definition: liblwgeom.h:1707
LWGEOM * lwgeom_from_wkb(const uint8_t *wkb, const size_t wkb_size, const char check)
WKB inputs must have a declared size, to prevent malformed WKB from reading off the end of the memory...
Definition: lwin_wkb.c:728
int lwgeom_needs_bbox(const LWGEOM *geom)
Check whether or not a lwgeom is big enough to warrant a bounding box.
Definition: lwgeom.c:1059

Here is the call graph for this function:

Here is the caller graph for this function: