PostGIS  2.3.7dev-r@@SVN_REVISION@@
Datum LWGEOM_in ( PG_FUNCTION_ARGS  )

Definition at line 84 of file lwgeom_inout.c.

References bytes_from_hexbytes(), struct_lwgeom_parser_result::geom, geometry_serialize(), 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().

85 {
86  char *input = PG_GETARG_CSTRING(0);
87  int32 geom_typmod = -1;
88  char *str = input;
89  LWGEOM_PARSER_RESULT lwg_parser_result;
90  LWGEOM *lwgeom;
91  GSERIALIZED *ret;
92  int srid = 0;
93 
94  if ( (PG_NARGS()>2) && (!PG_ARGISNULL(2)) ) {
95  geom_typmod = PG_GETARG_INT32(2);
96  }
97 
98  lwgeom_parser_result_init(&lwg_parser_result);
99 
100  /* Empty string. */
101  if ( str[0] == '\0' ) {
102  ereport(ERROR,(errmsg("parse error - invalid geometry")));
103  PG_RETURN_NULL();
104  }
105 
106  /* Starts with "SRID=" */
107  if( strncasecmp(str,"SRID=",5) == 0 )
108  {
109  /* Roll forward to semi-colon */
110  char *tmp = str;
111  while ( tmp && *tmp != ';' )
112  tmp++;
113 
114  /* Check next character to see if we have WKB */
115  if ( tmp && *(tmp+1) == '0' )
116  {
117  /* Null terminate the SRID= string */
118  *tmp = '\0';
119  /* Set str to the start of the real WKB */
120  str = tmp + 1;
121  /* Move tmp to the start of the numeric part */
122  tmp = input + 5;
123  /* Parse out the SRID number */
124  srid = atoi(tmp);
125  }
126  }
127 
128  /* WKB? Let's find out. */
129  if ( str[0] == '0' )
130  {
131  size_t hexsize = strlen(str);
132  unsigned char *wkb = bytes_from_hexbytes(str, hexsize);
133  /* TODO: 20101206: No parser checks! This is inline with current 1.5 behavior, but needs discussion */
134  lwgeom = lwgeom_from_wkb(wkb, hexsize/2, LW_PARSER_CHECK_NONE);
135  /* If we picked up an SRID at the head of the WKB set it manually */
136  if ( srid ) lwgeom_set_srid(lwgeom, srid);
137  /* Add a bbox if necessary */
138  if ( lwgeom_needs_bbox(lwgeom) ) lwgeom_add_bbox(lwgeom);
139  pfree(wkb);
140  ret = geometry_serialize(lwgeom);
141  lwgeom_free(lwgeom);
142  }
143  /* WKT then. */
144  else
145  {
146  if ( lwgeom_parse_wkt(&lwg_parser_result, str, LW_PARSER_CHECK_ALL) == LW_FAILURE )
147  {
148  PG_PARSER_ERROR(lwg_parser_result);
149  PG_RETURN_NULL();
150  }
151  lwgeom = lwg_parser_result.geom;
152  if ( lwgeom_needs_bbox(lwgeom) )
153  lwgeom_add_bbox(lwgeom);
154  ret = geometry_serialize(lwgeom);
155  lwgeom_parser_result_free(&lwg_parser_result);
156  }
157 
158  if ( geom_typmod >= 0 )
159  {
160  ret = postgis_valid_typmod(ret, geom_typmod);
161  POSTGIS_DEBUG(3, "typmod and geometry were consistent");
162  }
163  else
164  {
165  POSTGIS_DEBUG(3, "typmod was -1");
166  }
167 
168  /* Don't free the parser result (and hence lwgeom) until we have done */
169  /* the typemod check with lwgeom */
170 
171  PG_RETURN_POINTER(ret);
172 
173 }
unsigned int int32
Definition: shpopen.c:273
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:86
void lwgeom_free(LWGEOM *geom)
Definition: lwgeom.c:1063
void lwgeom_parser_result_free(LWGEOM_PARSER_RESULT *parser_result)
Definition: lwin_wkt.c:885
#define LW_FAILURE
Definition: liblwgeom.h:78
#define LW_PARSER_CHECK_NONE
Definition: liblwgeom.h:1985
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:1992
GSERIALIZED * geometry_serialize(LWGEOM *lwgeom)
void lwgeom_parser_result_init(LWGEOM_PARSER_RESULT *parser_result)
Definition: lwin_wkt.c:879
void lwgeom_add_bbox(LWGEOM *lwgeom)
Compute a bbox if not already computed.
Definition: lwgeom.c:612
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:1986
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:765
int lwgeom_needs_bbox(const LWGEOM *geom)
Check whether or not a lwgeom is big enough to warrant a bounding box.
Definition: lwgeom.c:1116

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