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grass.cpp
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grass.cpp
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/******************************************************************************
*
* Project: GRASS Driver
* Purpose: Implement GRASS raster read/write support
* This version is for GRASS GIS 7+ and uses GRASS libraries
* directly instead of using libgrass.
* Author: Frank Warmerdam <[email protected]>
* Radim Blazek <[email protected]>
*
******************************************************************************
* Copyright (c) 2000 Frank Warmerdam <[email protected]>
* Copyright (c) 2007-2020, Even Rouault <even dot rouault at spatialys.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
****************************************************************************/
#include <stdlib.h>
#include "cpl_string.h"
#include "gdal_frmts.h"
#include "gdal_priv.h"
#include "ogr_spatialref.h"
extern "C"
{
#ifdef __cplusplus
#define class _class
#endif
#include <grass/imagery.h>
#ifdef __cplusplus
#undef class
#endif
#include <grass/version.h>
#include <grass/gprojects.h>
#include <grass/gis.h>
char *GPJ_grass_to_wkt(const struct Key_Value *, const struct Key_Value *,
int, int);
void GDALRegister_GRASS();
}
#define GRASS_MAX_COLORS 100000 // what is the right value
/************************************************************************/
/* Grass2CPLErrorHook() */
/************************************************************************/
static int Grass2CPLErrorHook(char *pszMessage, int bFatal)
{
if (!bFatal)
//CPLDebug( "GRASS", "%s", pszMessage );
CPLError(CE_Warning, CPLE_AppDefined, "GRASS warning: %s", pszMessage);
else
CPLError(CE_Warning, CPLE_AppDefined, "GRASS fatal error: %s",
pszMessage);
return 0;
}
/************************************************************************/
/* ==================================================================== */
/* GRASSDataset */
/* ==================================================================== */
/************************************************************************/
class GRASSRasterBand;
class GRASSDataset final : public GDALDataset
{
friend class GRASSRasterBand;
char *pszGisdbase;
char *pszLocation; /* LOCATION_NAME */
char *pszElement; /* cellhd or group */
struct Cell_head sCellInfo; /* raster region */
OGRSpatialReference m_oSRS{};
double adfGeoTransform[6];
public:
GRASSDataset();
~GRASSDataset() override;
const OGRSpatialReference *GetSpatialRef() const override;
CPLErr GetGeoTransform(double *) override;
static GDALDataset *Open(GDALOpenInfo *);
private:
static bool SplitPath(char *, char **, char **, char **, char **, char **);
};
/************************************************************************/
/* ==================================================================== */
/* GRASSRasterBand */
/* ==================================================================== */
/************************************************************************/
class GRASSRasterBand final : public GDALRasterBand
{
friend class GRASSDataset;
char *pszCellName;
char *pszMapset;
int hCell;
int nGRSType; // GRASS raster type: CELL_TYPE, FCELL_TYPE, DCELL_TYPE
bool nativeNulls; // use GRASS native NULL values
struct Colors sGrassColors;
GDALColorTable *poCT;
struct Cell_head sOpenWindow; /* the region when the raster was opened */
int bHaveMinMax;
double dfCellMin;
double dfCellMax;
double dfNoData;
bool valid;
public:
GRASSRasterBand(GRASSDataset *, int, const char *, const char *);
~GRASSRasterBand() override;
CPLErr IReadBlock(int, int, void *) override;
CPLErr IRasterIO(GDALRWFlag, int, int, int, int, void *, int, int,
GDALDataType, GSpacing nPixelSpace, GSpacing nLineSpace,
GDALRasterIOExtraArg *psExtraArg) override;
GDALColorInterp GetColorInterpretation() override;
GDALColorTable *GetColorTable() override;
double GetMinimum(int *pbSuccess = NULL) override;
double GetMaximum(int *pbSuccess = NULL) override;
double GetNoDataValue(int *pbSuccess = NULL) override;
private:
void SetWindow(struct Cell_head *);
CPLErr ResetReading(struct Cell_head *);
};
/************************************************************************/
/* GRASSRasterBand() */
/************************************************************************/
GRASSRasterBand::GRASSRasterBand(GRASSDataset *poDSIn, int nBandIn,
const char *pszMapsetIn,
const char *pszCellNameIn)
{
struct Cell_head sCellInfo;
// Note: GISDBASE, LOCATION_NAME ans MAPSET was set in GRASSDataset::Open
this->poDS = poDSIn;
this->nBand = nBandIn;
this->valid = false;
this->pszCellName = G_store((char *)pszCellNameIn);
this->pszMapset = G_store((char *)pszMapsetIn);
Rast_get_cellhd((char *)pszCellName, (char *)pszMapset, &sCellInfo);
nGRSType = Rast_map_type((char *)pszCellName, (char *)pszMapset);
/* -------------------------------------------------------------------- */
/* Get min/max values. */
/* -------------------------------------------------------------------- */
struct FPRange sRange;
if (Rast_read_fp_range((char *)pszCellName, (char *)pszMapset, &sRange) ==
-1)
{
bHaveMinMax = FALSE;
}
else
{
bHaveMinMax = TRUE;
Rast_get_fp_range_min_max(&sRange, &dfCellMin, &dfCellMax);
}
/* -------------------------------------------------------------------- */
/* Setup band type, and preferred nodata value. */
/* -------------------------------------------------------------------- */
// Negative values are also (?) stored as 4 bytes (format = 3)
// => raster with format < 3 has only positive values
// GRASS modules usually do not waste space and only the format necessary to keep
// full raster values range is used -> no checks if shorter type could be used
if (nGRSType == CELL_TYPE)
{
if (sCellInfo.format == 0)
{ // 1 byte / cell -> possible range 0,255
if (bHaveMinMax && dfCellMin > 0)
{
this->eDataType = GDT_Byte;
dfNoData = 0.0;
}
else if (bHaveMinMax && dfCellMax < 255)
{
this->eDataType = GDT_Byte;
dfNoData = 255.0;
}
else
{ // maximum is not known or full range is used
this->eDataType = GDT_UInt16;
dfNoData = 256.0;
}
nativeNulls = false;
}
else if (sCellInfo.format == 1)
{ // 2 bytes / cell -> possible range 0,65535
if (bHaveMinMax && dfCellMin > 0)
{
this->eDataType = GDT_UInt16;
dfNoData = 0.0;
}
else if (bHaveMinMax && dfCellMax < 65535)
{
this->eDataType = GDT_UInt16;
dfNoData = 65535;
}
else
{ // maximum is not known or full range is used
CELL cval;
this->eDataType = GDT_Int32;
Rast_set_c_null_value(&cval, 1);
dfNoData = (double)cval;
}
nativeNulls = false;
}
else
{ // 3-4 bytes
CELL cval;
this->eDataType = GDT_Int32;
Rast_set_c_null_value(&cval, 1);
dfNoData = (double)cval;
nativeNulls = true;
}
}
else if (nGRSType == FCELL_TYPE)
{
FCELL fval;
this->eDataType = GDT_Float32;
Rast_set_f_null_value(&fval, 1);
dfNoData = (double)fval;
nativeNulls = true;
}
else if (nGRSType == DCELL_TYPE)
{
DCELL dval;
this->eDataType = GDT_Float64;
Rast_set_d_null_value(&dval, 1);
dfNoData = (double)dval;
nativeNulls = true;
}
nBlockXSize = poDSIn->nRasterXSize;
nBlockYSize = 1;
Rast_set_window(&(poDSIn->sCellInfo));
// open the raster only for actual reading
hCell = -1;
memcpy((void *)&sOpenWindow, (void *)&(poDSIn->sCellInfo),
sizeof(struct Cell_head));
/* -------------------------------------------------------------------- */
/* Do we have a color table? */
/* -------------------------------------------------------------------- */
poCT = NULL;
if (Rast_read_colors((char *)pszCellName, (char *)pszMapset,
&sGrassColors) == 1)
{
int maxcolor;
CELL min, max;
Rast_get_c_color_range(&min, &max, &sGrassColors);
if (bHaveMinMax)
{
if (max < dfCellMax)
{
maxcolor = max;
}
else
{
maxcolor = (int)ceil(dfCellMax);
}
if (maxcolor > GRASS_MAX_COLORS)
{
maxcolor = GRASS_MAX_COLORS;
CPLDebug("GRASS",
"Too many values, color table cut to %d entries.",
maxcolor);
}
}
else
{
if (max < GRASS_MAX_COLORS)
{
maxcolor = max;
}
else
{
maxcolor = GRASS_MAX_COLORS;
CPLDebug("GRASS",
"Too many values, color table set to %d entries.",
maxcolor);
}
}
poCT = new GDALColorTable();
for (int iColor = 0; iColor <= maxcolor; iColor++)
{
int nRed, nGreen, nBlue;
GDALColorEntry sColor;
if (Rast_get_c_color(&iColor, &nRed, &nGreen, &nBlue,
&sGrassColors))
{
sColor.c1 = nRed;
sColor.c2 = nGreen;
sColor.c3 = nBlue;
sColor.c4 = 255;
poCT->SetColorEntry(iColor, &sColor);
}
else
{
sColor.c1 = 0;
sColor.c2 = 0;
sColor.c3 = 0;
sColor.c4 = 0;
poCT->SetColorEntry(iColor, &sColor);
}
}
/* Create metadata entries for color table rules */
char key[200], value[200];
int rcount = Rast_colors_count(&sGrassColors);
snprintf(value, sizeof(value), "%d", rcount);
this->SetMetadataItem("COLOR_TABLE_RULES_COUNT", value);
/* Add the rules in reverse order */
for (int i = rcount - 1; i >= 0; i--)
{
DCELL val1, val2;
unsigned char r1, g1, b1, r2, g2, b2;
Rast_get_fp_color_rule(&val1, &r1, &g1, &b1, &val2, &r2, &g2, &b2,
&sGrassColors, i);
snprintf(key, sizeof(key), "COLOR_TABLE_RULE_RGB_%d",
rcount - i - 1);
snprintf(value, sizeof(value), "%e %e %d %d %d %d %d %d", val1,
val2, r1, g1, b1, r2, g2, b2);
this->SetMetadataItem(key, value);
}
}
else
{
this->SetMetadataItem("COLOR_TABLE_RULES_COUNT", "0");
}
this->valid = true;
}
/************************************************************************/
/* ~GRASSRasterBand() */
/************************************************************************/
GRASSRasterBand::~GRASSRasterBand()
{
if (poCT != NULL)
{
Rast_free_colors(&sGrassColors);
delete poCT;
}
if (hCell >= 0)
Rast_close(hCell);
if (pszCellName)
G_free(pszCellName);
if (pszMapset)
G_free(pszMapset);
}
/************************************************************************/
/* SetWindow */
/* */
/* Helper for ResetReading */
/* close the current GRASS raster band, actually set the new window, */
/* reset GRASS variables */
/* */
/* Returns nothing */
/************************************************************************/
void GRASSRasterBand::SetWindow(struct Cell_head *sNewWindow)
{
if (hCell >= 0)
{
Rast_close(hCell);
hCell = -1;
}
/* Set window */
Rast_set_window(sNewWindow);
/* Set GRASS env to the current raster, don't open the raster */
G_setenv_nogisrc("GISDBASE", ((GRASSDataset *)poDS)->pszGisdbase);
G_setenv_nogisrc("LOCATION_NAME", ((GRASSDataset *)poDS)->pszLocation);
G_setenv_nogisrc("MAPSET", pszMapset);
G_reset_mapsets();
G_add_mapset_to_search_path(pszMapset);
}
/************************************************************************/
/* ResetReading */
/* */
/* Reset current window for a new reading request, */
/* close the current GRASS raster band, reset GRASS variables */
/* */
/* Returns CE_Failure if fails, otherwise CE_None */
/************************************************************************/
CPLErr GRASSRasterBand::ResetReading(struct Cell_head *sNewWindow)
{
/* Check if the window has changed */
if (sNewWindow->north != sOpenWindow.north ||
sNewWindow->south != sOpenWindow.south ||
sNewWindow->east != sOpenWindow.east ||
sNewWindow->west != sOpenWindow.west ||
sNewWindow->ew_res != sOpenWindow.ew_res ||
sNewWindow->ns_res != sOpenWindow.ns_res ||
sNewWindow->rows != sOpenWindow.rows ||
sNewWindow->cols != sOpenWindow.cols)
{
SetWindow(sNewWindow);
memcpy((void *)&sOpenWindow, (void *)sNewWindow,
sizeof(struct Cell_head));
}
else
{
/* The windows are identical, check current window */
struct Cell_head sCurrentWindow;
Rast_get_window(&sCurrentWindow);
if (sNewWindow->north != sCurrentWindow.north ||
sNewWindow->south != sCurrentWindow.south ||
sNewWindow->east != sCurrentWindow.east ||
sNewWindow->west != sCurrentWindow.west ||
sNewWindow->ew_res != sCurrentWindow.ew_res ||
sNewWindow->ns_res != sCurrentWindow.ns_res ||
sNewWindow->rows != sCurrentWindow.rows ||
sNewWindow->cols != sCurrentWindow.cols)
{
SetWindow(sNewWindow);
}
}
return CE_None;
}
/************************************************************************/
/* IReadBlock() */
/* */
/************************************************************************/
CPLErr GRASSRasterBand::IReadBlock(int /*nBlockXOff*/, int nBlockYOff,
void *pImage)
{
if (!this->valid)
return CE_Failure;
// Reset window because IRasterIO could be previously called.
if (ResetReading(&(((GRASSDataset *)poDS)->sCellInfo)) != CE_None)
{
return CE_Failure;
}
// open for reading
if (hCell < 0)
{
if ((hCell = Rast_open_old((char *)pszCellName, (char *)pszMapset)) < 0)
{
CPLError(CE_Failure, CPLE_AppDefined,
"GRASS: Cannot open raster '%s'", pszCellName);
return CE_Failure;
}
}
if (eDataType == GDT_Byte || eDataType == GDT_UInt16)
{
CELL *cbuf = Rast_allocate_c_buf();
Rast_get_c_row(hCell, cbuf, nBlockYOff);
/* Reset NULLs */
for (int col = 0; col < nBlockXSize; col++)
{
if (Rast_is_c_null_value(&(cbuf[col])))
cbuf[col] = (CELL)dfNoData;
}
GDALCopyWords((void *)cbuf, GDT_Int32, sizeof(CELL), pImage, eDataType,
GDALGetDataTypeSize(eDataType) / 8, nBlockXSize);
G_free(cbuf);
}
else if (eDataType == GDT_Int32)
{
Rast_get_c_row(hCell, (CELL *)pImage, nBlockYOff);
}
else if (eDataType == GDT_Float32)
{
Rast_get_f_row(hCell, (FCELL *)pImage, nBlockYOff);
}
else if (eDataType == GDT_Float64)
{
Rast_get_d_row(hCell, (DCELL *)pImage, nBlockYOff);
}
// close to avoid confusion with other GRASS raster bands
Rast_close(hCell);
hCell = -1;
return CE_None;
}
/************************************************************************/
/* IRasterIO() */
/* */
/************************************************************************/
CPLErr GRASSRasterBand::IRasterIO(GDALRWFlag eRWFlag, int nXOff, int nYOff,
int nXSize, int nYSize, void *pData,
int nBufXSize, int nBufYSize,
GDALDataType eBufType, GSpacing nPixelSpace,
GSpacing nLineSpace,
GDALRasterIOExtraArg * /*psExtraArg*/)
{
/* GRASS library does that, we have only calculate and reset the region in map units
* and if the region has changed, reopen the raster */
/* Calculate the region */
struct Cell_head sWindow;
struct Cell_head *psDsWindow;
if (eRWFlag != GF_Read)
return CE_Failure;
if (!this->valid)
return CE_Failure;
psDsWindow = &(((GRASSDataset *)poDS)->sCellInfo);
sWindow.north = psDsWindow->north - nYOff * psDsWindow->ns_res;
sWindow.south = sWindow.north - nYSize * psDsWindow->ns_res;
sWindow.west = psDsWindow->west + nXOff * psDsWindow->ew_res;
sWindow.east = sWindow.west + nXSize * psDsWindow->ew_res;
sWindow.proj = psDsWindow->proj;
sWindow.zone = psDsWindow->zone;
sWindow.cols = nBufXSize;
sWindow.rows = nBufYSize;
/* Reset resolution */
G_adjust_Cell_head(&sWindow, 1, 1);
if (ResetReading(&sWindow) != CE_None)
{
return CE_Failure;
}
// open for reading
if (hCell < 0)
{
if ((hCell = Rast_open_old((char *)pszCellName, (char *)pszMapset)) < 0)
{
CPLError(CE_Failure, CPLE_AppDefined,
"GRASS: Cannot open raster '%s'", pszCellName);
return CE_Failure;
}
}
/* Read Data */
CELL *cbuf = NULL;
FCELL *fbuf = NULL;
DCELL *dbuf = NULL;
bool direct = false;
/* Reset space if default (0) */
if (nPixelSpace == 0)
nPixelSpace = GDALGetDataTypeSize(eBufType) / 8;
if (nLineSpace == 0)
nLineSpace = nBufXSize * nPixelSpace;
if (nGRSType == CELL_TYPE &&
(!nativeNulls || eBufType != GDT_Int32 || sizeof(CELL) != 4 ||
nPixelSpace != sizeof(CELL)))
{
cbuf = Rast_allocate_c_buf();
}
else if (nGRSType == FCELL_TYPE &&
(eBufType != GDT_Float32 || nPixelSpace != sizeof(FCELL)))
{
fbuf = Rast_allocate_f_buf();
}
else if (nGRSType == DCELL_TYPE &&
(eBufType != GDT_Float64 || nPixelSpace != sizeof(DCELL)))
{
dbuf = Rast_allocate_d_buf();
}
else
{
direct = true;
}
for (int row = 0; row < nBufYSize; row++)
{
char *pnt = (char *)pData + row * nLineSpace;
if (nGRSType == CELL_TYPE)
{
if (direct)
{
Rast_get_c_row(hCell, (CELL *)pnt, row);
}
else
{
Rast_get_c_row(hCell, cbuf, row);
/* Reset NULLs */
for (int col = 0; col < nBufXSize; col++)
{
if (Rast_is_c_null_value(&(cbuf[col])))
cbuf[col] = (CELL)dfNoData;
}
GDALCopyWords((void *)cbuf, GDT_Int32, sizeof(CELL),
(void *)pnt, eBufType, nPixelSpace, nBufXSize);
}
}
else if (nGRSType == FCELL_TYPE)
{
if (direct)
{
Rast_get_f_row(hCell, (FCELL *)pnt, row);
}
else
{
Rast_get_f_row(hCell, fbuf, row);
GDALCopyWords((void *)fbuf, GDT_Float32, sizeof(FCELL),
(void *)pnt, eBufType, nPixelSpace, nBufXSize);
}
}
else if (nGRSType == DCELL_TYPE)
{
if (direct)
{
Rast_get_d_row(hCell, (DCELL *)pnt, row);
}
else
{
Rast_get_d_row(hCell, dbuf, row);
GDALCopyWords((void *)dbuf, GDT_Float64, sizeof(DCELL),
(void *)pnt, eBufType, nPixelSpace, nBufXSize);
}
}
}
if (cbuf)
G_free(cbuf);
if (fbuf)
G_free(fbuf);
if (dbuf)
G_free(dbuf);
// close to avoid confusion with other GRASS raster bands
Rast_close(hCell);
hCell = -1;
return CE_None;
}
/************************************************************************/
/* GetColorInterpretation() */
/************************************************************************/
GDALColorInterp GRASSRasterBand::GetColorInterpretation()
{
if (poCT != NULL)
return GCI_PaletteIndex;
else
return GCI_GrayIndex;
}
/************************************************************************/
/* GetColorTable() */
/************************************************************************/
GDALColorTable *GRASSRasterBand::GetColorTable()
{
return poCT;
}
/************************************************************************/
/* GetMinimum() */
/************************************************************************/
double GRASSRasterBand::GetMinimum(int *pbSuccess)
{
if (pbSuccess)
*pbSuccess = bHaveMinMax;
if (bHaveMinMax)
return dfCellMin;
else if (eDataType == GDT_Float32 || eDataType == GDT_Float64)
return -4294967295.0;
else
return 0;
}
/************************************************************************/
/* GetMaximum() */
/************************************************************************/
double GRASSRasterBand::GetMaximum(int *pbSuccess)
{
if (pbSuccess)
*pbSuccess = bHaveMinMax;
if (bHaveMinMax)
return dfCellMax;
else if (eDataType == GDT_Float32 || eDataType == GDT_Float64)
return 4294967295.0;
else if (eDataType == GDT_UInt32)
return 4294967295.0;
else if (eDataType == GDT_UInt16)
return 65535;
else
return 255;
}
/************************************************************************/
/* GetNoDataValue() */
/************************************************************************/
double GRASSRasterBand::GetNoDataValue(int *pbSuccess)
{
if (pbSuccess)
*pbSuccess = TRUE;
return dfNoData;
}
/************************************************************************/
/* ==================================================================== */
/* GRASSDataset */
/* ==================================================================== */
/************************************************************************/
/************************************************************************/
/* GRASSDataset() */
/************************************************************************/
GRASSDataset::GRASSDataset()
{
m_oSRS.SetAxisMappingStrategy(OAMS_TRADITIONAL_GIS_ORDER);
adfGeoTransform[0] = 0.0;
adfGeoTransform[1] = 1.0;
adfGeoTransform[2] = 0.0;
adfGeoTransform[3] = 0.0;
adfGeoTransform[4] = 0.0;
adfGeoTransform[5] = 1.0;
pszGisdbase = NULL;
pszLocation = NULL;
pszElement = NULL;
}
/************************************************************************/
/* ~GRASSDataset() */
/************************************************************************/
GRASSDataset::~GRASSDataset()
{
if (pszGisdbase)
G_free(pszGisdbase);
if (pszLocation)
G_free(pszLocation);
if (pszElement)
G_free(pszElement);
}
/************************************************************************/
/* GetSpatialRef() */
/************************************************************************/
const OGRSpatialReference *GRASSDataset::GetSpatialRef() const
{
return m_oSRS.IsEmpty() ? nullptr : &m_oSRS;
}
/************************************************************************/
/* GetGeoTransform() */
/************************************************************************/
CPLErr GRASSDataset::GetGeoTransform(double *padfGeoTransform)
{
memcpy(padfGeoTransform, adfGeoTransform, sizeof(double) * 6);
return CE_None;
}
/************************************************************************/
/* SplitPath() */
/* Split full path to cell or group to: */
/* gisdbase, location, mapset, element, name */
/* New string are allocated and should be freed when no longer needed. */
/* */
/* Returns: true - OK */
/* false - failed */
/************************************************************************/
bool GRASSDataset::SplitPath(char *path, char **gisdbase, char **location,
char **mapset, char **element, char **name)
{
char *p;
char *ptr[5];
char *tmp;
int i = 0;
*gisdbase = NULL;
*location = NULL;
*mapset = NULL;
*element = NULL;
*name = NULL;
if (!path || strlen(path) == 0)
return false;
tmp = G_store(path);
while ((p = strrchr(tmp, '/')) != NULL && i < 4)
{
*p = '\0';
if (strlen(p + 1) == 0) /* repeated '/' */
continue;
ptr[i++] = p + 1;
}
/* Note: empty GISDBASE == 0 is not accepted (relative path) */
if (i != 4)
{
G_free(tmp);
return false;
}
*gisdbase = G_store(tmp);
*location = G_store(ptr[3]);
*mapset = G_store(ptr[2]);
*element = G_store(ptr[1]);
*name = G_store(ptr[0]);
G_free(tmp);
return true;
}
/************************************************************************/
/* Open() */
/************************************************************************/
typedef int (*GrassErrorHandler)(const char *, int);
GDALDataset *GRASSDataset::Open(GDALOpenInfo *poOpenInfo)
{
char *pszGisdb = NULL, *pszLoc = NULL;
char *pszMapset = NULL, *pszElem = NULL, *pszName = NULL;
char **papszCells = NULL;
char **papszMapsets = NULL;
/* -------------------------------------------------------------------- */
/* Does this even look like a grass file path? */
/* -------------------------------------------------------------------- */
if (strstr(poOpenInfo->pszFilename, "/cellhd/") == NULL &&
strstr(poOpenInfo->pszFilename, "/group/") == NULL)
return NULL;
/* Always init, if no rasters are opened G_no_gisinit resets the projection and
* rasters in different projection may be then opened */
// Don't use GISRC file and read/write GRASS variables (from location G_VAR_GISRC) to memory only.
G_set_gisrc_mode(G_GISRC_MODE_MEMORY);
// Init GRASS libraries (required)
G_no_gisinit(); // Doesn't check write permissions for mapset compare to G_gisinit
// Set error function
G_set_error_routine((GrassErrorHandler)Grass2CPLErrorHook);
// GISBASE is path to the directory where GRASS is installed,
if (!getenv("GISBASE"))
{
static char *gisbaseEnv = NULL;
const char *gisbase = GRASS_GISBASE;
CPLError(CE_Warning, CPLE_AppDefined,
"GRASS warning: GISBASE "
"environment variable was not set, using:\n%s",
gisbase);
char buf[2000];
snprintf(buf, sizeof(buf), "GISBASE=%s", gisbase);
buf[sizeof(buf) - 1] = '\0';
CPLFree(gisbaseEnv);
gisbaseEnv = CPLStrdup(buf);
putenv(gisbaseEnv);
}
if (!SplitPath(poOpenInfo->pszFilename, &pszGisdb, &pszLoc, &pszMapset,
&pszElem, &pszName))
{
return NULL;
}
/* -------------------------------------------------------------------- */
/* Check element name */
/* -------------------------------------------------------------------- */
if (strcmp(pszElem, "cellhd") != 0 && strcmp(pszElem, "group") != 0)
{
G_free(pszGisdb);
G_free(pszLoc);
G_free(pszMapset);
G_free(pszElem);
G_free(pszName);
return NULL;
}
/* -------------------------------------------------------------------- */
/* Set GRASS variables */
/* -------------------------------------------------------------------- */
G_setenv_nogisrc("GISDBASE", pszGisdb);
G_setenv_nogisrc("LOCATION_NAME", pszLoc);
G_setenv_nogisrc("MAPSET",
pszMapset); // group is searched only in current mapset
G_reset_mapsets();
G_add_mapset_to_search_path(pszMapset);
/* -------------------------------------------------------------------- */
/* Check if this is a valid grass cell. */
/* -------------------------------------------------------------------- */
if (strcmp(pszElem, "cellhd") == 0)
{
if (G_find_file2("cell", pszName, pszMapset) == NULL)
{
G_free(pszGisdb);
G_free(pszLoc);
G_free(pszMapset);
G_free(pszElem);
G_free(pszName);
return NULL;
}