PostGIS  2.5.1dev-r@@SVN_REVISION@@

◆ RASTER_getGDALDrivers()

Datum RASTER_getGDALDrivers ( PG_FUNCTION_ARGS  )

Definition at line 339 of file rtpg_gdal.c.

References FALSE, PG_FUNCTION_INFO_V1(), POSTGIS_RT_DEBUGF, RASTER_GDALWarp(), rt_raster_gdal_drivers(), and VALUES_LENGTH.

340 {
341  FuncCallContext *funcctx;
342  TupleDesc tupdesc;
343 
344  uint32_t drv_count;
345  rt_gdaldriver drv_set;
346  rt_gdaldriver drv_set2;
347  int call_cntr;
348  int max_calls;
349 
350  /* first call of function */
351  if (SRF_IS_FIRSTCALL()) {
352  MemoryContext oldcontext;
353 
354  /* create a function context for cross-call persistence */
355  funcctx = SRF_FIRSTCALL_INIT();
356 
357  /* switch to memory context appropriate for multiple function calls */
358  oldcontext = MemoryContextSwitchTo(funcctx->multi_call_memory_ctx);
359 
360  drv_set = rt_raster_gdal_drivers(&drv_count, 0);
361  if (NULL == drv_set || !drv_count) {
362  elog(NOTICE, "No GDAL drivers found");
363  MemoryContextSwitchTo(oldcontext);
364  SRF_RETURN_DONE(funcctx);
365  }
366 
367  POSTGIS_RT_DEBUGF(3, "%d drivers returned", (int) drv_count);
368 
369  /* Store needed information */
370  funcctx->user_fctx = drv_set;
371 
372  /* total number of tuples to be returned */
373  funcctx->max_calls = drv_count;
374 
375  /* Build a tuple descriptor for our result type */
376  if (get_call_result_type(fcinfo, NULL, &tupdesc) != TYPEFUNC_COMPOSITE) {
377  ereport(ERROR, (
378  errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
379  errmsg(
380  "function returning record called in context "
381  "that cannot accept type record"
382  )
383  ));
384  }
385 
386  BlessTupleDesc(tupdesc);
387  funcctx->tuple_desc = tupdesc;
388  MemoryContextSwitchTo(oldcontext);
389  }
390 
391  /* stuff done on every call of the function */
392  funcctx = SRF_PERCALL_SETUP();
393 
394  call_cntr = funcctx->call_cntr;
395  max_calls = funcctx->max_calls;
396  tupdesc = funcctx->tuple_desc;
397  drv_set2 = funcctx->user_fctx;
398 
399  /* do when there is more left to send */
400  if (call_cntr < max_calls) {
401  Datum values[VALUES_LENGTH];
402  bool nulls[VALUES_LENGTH];
403  HeapTuple tuple;
404  Datum result;
405 
406  POSTGIS_RT_DEBUGF(3, "Result %d", call_cntr);
407 
408  memset(nulls, FALSE, sizeof(bool) * VALUES_LENGTH);
409 
410  values[0] = Int32GetDatum(drv_set2[call_cntr].idx);
411  values[1] = CStringGetTextDatum(drv_set2[call_cntr].short_name);
412  values[2] = CStringGetTextDatum(drv_set2[call_cntr].long_name);
413  values[3] = BoolGetDatum(drv_set2[call_cntr].can_read);
414  values[4] = BoolGetDatum(drv_set2[call_cntr].can_write);
415  values[5] = CStringGetTextDatum(drv_set2[call_cntr].create_options);
416 
417  POSTGIS_RT_DEBUGF(4, "Result %d, Index %d", call_cntr, drv_set2[call_cntr].idx);
418  POSTGIS_RT_DEBUGF(4, "Result %d, Short Name %s", call_cntr, drv_set2[call_cntr].short_name);
419  POSTGIS_RT_DEBUGF(4, "Result %d, Full Name %s", call_cntr, drv_set2[call_cntr].long_name);
420  POSTGIS_RT_DEBUGF(4, "Result %d, Can Read %s", call_cntr, drv_set2[call_cntr].can_read);
421  POSTGIS_RT_DEBUGF(4, "Result %d, Can Write %s", call_cntr, drv_set2[call_cntr].can_write);
422  POSTGIS_RT_DEBUGF(5, "Result %d, Create Options %s", call_cntr, drv_set2[call_cntr].create_options);
423 
424  /* build a tuple */
425  tuple = heap_form_tuple(tupdesc, values, nulls);
426 
427  /* make the tuple into a datum */
428  result = HeapTupleGetDatum(tuple);
429 
430  /* clean up */
431  pfree(drv_set2[call_cntr].short_name);
432  pfree(drv_set2[call_cntr].long_name);
433  pfree(drv_set2[call_cntr].create_options);
434 
435  SRF_RETURN_NEXT(funcctx, result);
436  }
437  /* do when there is no more left */
438  else {
439  pfree(drv_set2);
440  SRF_RETURN_DONE(funcctx);
441  }
442 }
#define POSTGIS_RT_DEBUGF(level, msg,...)
Definition: rtpostgis.h:65
#define VALUES_LENGTH
Definition: rtpg_gdal.c:333
unsigned int uint32_t
Definition: uthash.h:78
#define FALSE
Definition: dbfopen.c:168
rt_gdaldriver rt_raster_gdal_drivers(uint32_t *drv_count, uint8_t cancc)
Returns a set of available GDAL drivers.
Definition: rt_raster.c:1716
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