rtpg_utility.c

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/*
 *
 * WKTRaster - Raster Types for PostGIS
 * http://trac.osgeo.org/postgis/wiki/WKTRaster
 *
 * Copyright (C) 2011-2013 Regents of the University of California
 *   <bkpark@ucdavis.edu>
 * Copyright (C) 2010-2011 Jorge Arevalo <jorge.arevalo@deimos-space.com>
 * Copyright (C) 2010-2011 David Zwarg <dzwarg@azavea.com>
 * Copyright (C) 2009-2011 Pierre Racine <pierre.racine@sbf.ulaval.ca>
 * Copyright (C) 2009-2011 Mateusz Loskot <mateusz@loskot.net>
 * Copyright (C) 2008-2009 Sandro Santilli <strk@kbt.io>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 */
 
#include <postgres.h> /* for palloc */
#include <fmgr.h>
#include <utils/builtins.h>
 
#include "../../postgis_config.h"
#include "lwgeom_pg.h"
 
#define xstr(s) str(s)
#define str(s) #s
 
#include "rtpostgis.h"
 
Datum RASTER_lib_version(PG_FUNCTION_ARGS);
Datum RASTER_lib_build_date(PG_FUNCTION_ARGS);
Datum RASTER_gdal_version(PG_FUNCTION_ARGS);
Datum RASTER_minPossibleValue(PG_FUNCTION_ARGS);
 
PG_FUNCTION_INFO_V1(RASTER_lib_version);
Datum RASTER_lib_version(PG_FUNCTION_ARGS)
{
    char ver[64];
    text *result;
 
    snprintf(ver, 64, "%s %s", POSTGIS_LIB_VERSION, xstr(POSTGIS_REVISION));
    ver[63] = '\0';
 
    result = cstring_to_text(ver);
    PG_RETURN_TEXT_P(result);
}
 
PG_FUNCTION_INFO_V1(RASTER_lib_build_date);
Datum RASTER_lib_build_date(PG_FUNCTION_ARGS)
{
    char *ver = POSTGIS_BUILD_DATE;
    text *result;
    result = palloc(VARHDRSZ  + strlen(ver));
    SET_VARSIZE(result, VARHDRSZ + strlen(ver));
    memcpy(VARDATA(result), ver, strlen(ver));
    PG_RETURN_POINTER(result);
}
 
PG_FUNCTION_INFO_V1(RASTER_gdal_version);
Datum RASTER_gdal_version(PG_FUNCTION_ARGS)
{
        const char *ver = rt_util_gdal_version("--version");
        text *result;
 
        /* add indicator if GDAL isn't configured right */
        if (!rt_util_gdal_configured()) {
                char *rtn = NULL;
                size_t sz = strlen(ver) + strlen(" GDAL_DATA not found") + 1;
                rtn = palloc(sz);
                if (!rtn)
                        result = cstring_to_text(ver);
                else {
                        snprintf(rtn, sz, "%s GDAL_DATA not found", ver);
                        result = cstring_to_text(rtn);
                        pfree(rtn);
                }
        }
        else
                result = cstring_to_text(ver);
 
        PG_RETURN_POINTER(result);
}
 
PG_FUNCTION_INFO_V1(RASTER_minPossibleValue);
Datum RASTER_minPossibleValue(PG_FUNCTION_ARGS)
{
        text *pixeltypetext = NULL;
        char *pixeltypechar = NULL;
        rt_pixtype pixtype = PT_END;
        double pixsize = 0;
 
        if (PG_ARGISNULL(0))
                PG_RETURN_NULL();
 
        pixeltypetext = PG_GETARG_TEXT_P(0);
        pixeltypechar = text_to_cstring(pixeltypetext);
 
        pixtype = rt_pixtype_index_from_name(pixeltypechar);
        if (pixtype == PT_END) {
                elog(ERROR, "RASTER_minPossibleValue: Invalid pixel type: %s", pixeltypechar);
                PG_RETURN_NULL();
        }
 
        pixsize = rt_pixtype_get_min_value(pixtype);
 
        /*
                correct pixsize of unsigned pixel types
                example: for PT_8BUI, the value is CHAR_MIN but if char is signed,
                        the value returned is -127 instead of 0.
        */
        switch (pixtype) {
                case PT_1BB:
                case PT_2BUI:
                case PT_4BUI:
                case PT_8BUI:
                case PT_16BUI:
                case PT_32BUI:
                        pixsize = 0;
                        break;
                default:
                        break;
        }
 
        PG_RETURN_FLOAT8(pixsize);
}
 
Datum RASTER_memsize(PG_FUNCTION_ARGS);
PG_FUNCTION_INFO_V1(RASTER_memsize);
Datum RASTER_memsize(PG_FUNCTION_ARGS)
{
  void *detoasted = PG_DETOAST_DATUM(PG_GETARG_DATUM(0));
  size_t size = VARSIZE(detoasted);
  PG_FREE_IF_COPY(detoasted,0);
  PG_RETURN_INT32(size);
}