CPLErr GDALProxyDataset::IRasterIO( GDALRWFlag eRWFlag,
int nXOff, int nYOff, int nXSize, int nYSize,
void * pData, int nBufXSize, int nBufYSize,
GDALDataType eBufType,
int nBandCount, int *panBandMap,
GSpacing nPixelSpace, GSpacing nLineSpace, GSpacing nBandSpace,
GDALRasterIOExtraArg* psExtraArg)
{
CPLErr ret;
GDALDataset* poUnderlyingDataset = RefUnderlyingDataset();
if (poUnderlyingDataset)
{
/* -------------------------------------------------------------------- */
/* Do some validation of parameters. */
/* -------------------------------------------------------------------- */
if( nXOff + nXSize > poUnderlyingDataset->GetRasterXSize() ||
nYOff + nYSize > poUnderlyingDataset->GetRasterYSize() )
{
ReportError( CE_Failure, CPLE_IllegalArg,
"Access window out of range in RasterIO(). Requested\n"
"(%d,%d) of size %dx%d on raster of %dx%d.",
nXOff, nYOff, nXSize, nYSize,
poUnderlyingDataset->GetRasterXSize(),
poUnderlyingDataset->GetRasterYSize() );
ret = CE_Failure;
}
else if( panBandMap == NULL && nBandCount > poUnderlyingDataset->GetRasterCount() )
{
ReportError( CE_Failure, CPLE_IllegalArg,
"%s: nBandCount cannot be greater than %d",
"IRasterIO", poUnderlyingDataset->GetRasterCount() );
ret = CE_Failure;
}
else
{
ret = CE_None;
for( int i = 0; i < nBandCount && ret == CE_None; ++i )
{
int iBand = (panBandMap != NULL) ? panBandMap[i] : i + 1;
if( iBand < 1 || iBand > poUnderlyingDataset->GetRasterCount() )
{
ReportError( CE_Failure, CPLE_IllegalArg,
"%s: panBandMap[%d] = %d, this band does not exist on dataset.",
"IRasterIO", i, iBand );
ret = CE_Failure;
}
if( ret == CE_None && poUnderlyingDataset->GetRasterBand( iBand ) == NULL )
{
ReportError( CE_Failure, CPLE_IllegalArg,
"%s: panBandMap[%d]=%d, this band should exist but is NULL!",
"IRasterIO", i, iBand );
ret = CE_Failure;
}
}
if( ret != CE_Failure )
{
ret = poUnderlyingDataset->IRasterIO( eRWFlag, nXOff, nYOff, nXSize, nYSize,
pData, nBufXSize, nBufYSize,
eBufType, nBandCount, panBandMap,
nPixelSpace, nLineSpace, nBandSpace, psExtraArg );
}
}
UnrefUnderlyingDataset(poUnderlyingDataset);
}
else
{
ret = CE_Failure;
}
return ret;
}
