GDALDataset *JDEMDataset::Open( GDALOpenInfo *poOpenInfo )
{
// Confirm that the header is compatible with a JDEM dataset.
if (!Identify(poOpenInfo))
return nullptr;
// Confirm the requested access is supported.
if( poOpenInfo->eAccess == GA_Update )
{
CPLError(CE_Failure, CPLE_NotSupported,
"The JDEM driver does not support update access to existing "
"datasets.");
return nullptr;
}
// Check that the file pointer from GDALOpenInfo* is available.
if( poOpenInfo->fpL == nullptr )
{
return nullptr;
}
// Create a corresponding GDALDataset.
JDEMDataset *poDS = new JDEMDataset();
// Borrow the file pointer from GDALOpenInfo*.
poDS->fp = poOpenInfo->fpL;
poOpenInfo->fpL = nullptr;
// Read the header.
CPL_IGNORE_RET_VAL(VSIFReadL(poDS->abyHeader, 1, 1012, poDS->fp));
const char *psHeader = reinterpret_cast<char *>(poDS->abyHeader);
poDS->nRasterXSize = JDEMGetField(psHeader + 23, 3);
poDS->nRasterYSize = JDEMGetField(psHeader + 26, 3);
if( poDS->nRasterXSize <= 0 || poDS->nRasterYSize <= 0 )
{
CPLError(CE_Failure, CPLE_AppDefined,
"Invalid dimensions : %d x %d",
poDS->nRasterXSize, poDS->nRasterYSize);
delete poDS;
return nullptr;
}
// Create band information objects.
poDS->SetBand(1, new JDEMRasterBand(poDS, 1));
// Initialize any PAM information.
poDS->SetDescription(poOpenInfo->pszFilename);
poDS->TryLoadXML();
// Check for overviews.
poDS->oOvManager.Initialize(poDS, poOpenInfo->pszFilename);
return poDS;
}
GDALDataset *JDEMDataset::Open( GDALOpenInfo * poOpenInfo )
{
/* -------------------------------------------------------------------- */
/* Confirm that the header is compatible with a JDEM dataset. */
/* -------------------------------------------------------------------- */
if (!Identify(poOpenInfo))
return NULL;
/* -------------------------------------------------------------------- */
/* Confirm the requested access is supported. */
/* -------------------------------------------------------------------- */
if( poOpenInfo->eAccess == GA_Update )
{
CPLError( CE_Failure, CPLE_NotSupported,
"The JDEM driver does not support update access to existing"
" datasets.\n" );
return NULL;
}
/* Check that the file pointer from GDALOpenInfo* is available */
if( poOpenInfo->fpL == NULL )
{
return NULL;
}
/* -------------------------------------------------------------------- */
/* Create a corresponding GDALDataset. */
/* -------------------------------------------------------------------- */
JDEMDataset *poDS;
poDS = new JDEMDataset();
/* Borrow the file pointer from GDALOpenInfo* */
poDS->fp = poOpenInfo->fpL;
poOpenInfo->fpL = NULL;
/* -------------------------------------------------------------------- */
/* Read the header. */
/* -------------------------------------------------------------------- */
VSIFReadL( poDS->abyHeader, 1, 1012, poDS->fp );
poDS->nRasterXSize = JDEMGetField( (char *) poDS->abyHeader + 23, 3 );
poDS->nRasterYSize = JDEMGetField( (char *) poDS->abyHeader + 26, 3 );
if (poDS->nRasterXSize <= 0 || poDS->nRasterYSize <= 0 )
{
CPLError( CE_Failure, CPLE_AppDefined,
"Invalid dimensions : %d x %d",
poDS->nRasterXSize, poDS->nRasterYSize);
delete poDS;
return NULL;
}
/* -------------------------------------------------------------------- */
/* Create band information objects. */
/* -------------------------------------------------------------------- */
poDS->SetBand( 1, new JDEMRasterBand( poDS, 1 ));
/* -------------------------------------------------------------------- */
/* Initialize any PAM information. */
/* -------------------------------------------------------------------- */
poDS->SetDescription( poOpenInfo->pszFilename );
poDS->TryLoadXML();
/* -------------------------------------------------------------------- */
/* Check for overviews. */
/* -------------------------------------------------------------------- */
poDS->oOvManager.Initialize( poDS, poOpenInfo->pszFilename );
return( poDS );
}
