GDALDataset *RDataset::Open( GDALOpenInfo * poOpenInfo )
{
if( !Identify( poOpenInfo ) )
return NULL;
/* -------------------------------------------------------------------- */
/* Confirm the requested access is supported. */
/* -------------------------------------------------------------------- */
if( poOpenInfo->eAccess == GA_Update )
{
CPLError( CE_Failure, CPLE_NotSupported,
"The R driver does not support update access to existing"
" datasets.\n" );
return NULL;
}
/* -------------------------------------------------------------------- */
/* Do we need to route the file through the decompression */
/* machinery? */
/* -------------------------------------------------------------------- */
CPLString osAdjustedFilename;
if( memcmp(poOpenInfo->pabyHeader,"\037\213\b",3) == 0 )
osAdjustedFilename = "/vsigzip/";
osAdjustedFilename += poOpenInfo->pszFilename;
/* -------------------------------------------------------------------- */
/* Establish this as a dataset and open the file using VSI*L. */
/* -------------------------------------------------------------------- */
RDataset *poDS = new RDataset();
poDS->fp = VSIFOpenL( osAdjustedFilename, "r" );
if( poDS->fp == NULL )
{
delete poDS;
return NULL;
}
poDS->bASCII = EQUALN((const char *)poOpenInfo->pabyHeader,"RDA2\nA\n",7);
/* -------------------------------------------------------------------- */
/* Confirm this is a version 2 file. */
/* -------------------------------------------------------------------- */
VSIFSeekL( poDS->fp, 7, SEEK_SET );
if( poDS->ReadInteger() != R_LISTSXP )
{
delete poDS;
CPLError( CE_Failure, CPLE_OpenFailed,
"It appears %s is not a version 2 R object file after all!",
poOpenInfo->pszFilename );
return NULL;
}
/* -------------------------------------------------------------------- */
/* Skip the version values. */
/* -------------------------------------------------------------------- */
poDS->ReadInteger();
poDS->ReadInteger();
/* -------------------------------------------------------------------- */
/* Confirm we have a numeric vector object in a pairlist. */
/* -------------------------------------------------------------------- */
CPLString osObjName;
int nObjCode;
if( !poDS->ReadPair( osObjName, nObjCode ) )
{
delete poDS;
return NULL;
}
if( nObjCode % 256 != R_REALSXP )
{
delete poDS;
CPLError( CE_Failure, CPLE_OpenFailed,
"Failed to find expected numeric vector object." );
return NULL;
}
poDS->SetMetadataItem( "R_OBJECT_NAME", osObjName );
/* -------------------------------------------------------------------- */
/* Read the count. */
/* -------------------------------------------------------------------- */
int nValueCount = poDS->ReadInteger();
poDS->nStartOfData = VSIFTellL( poDS->fp );
/* -------------------------------------------------------------------- */
/* Read/Skip ahead to attributes. */
/* -------------------------------------------------------------------- */
if( poDS->bASCII )
{
poDS->padfMatrixValues = (double*) VSIMalloc2( nValueCount, sizeof(double) );
if (poDS->padfMatrixValues == NULL)
{
CPLError(CE_Failure, CPLE_AppDefined,
"Cannot allocate %d doubles", nValueCount);
delete poDS;
return NULL;
}
for( int iValue = 0; iValue < nValueCount; iValue++ )
poDS->padfMatrixValues[iValue] = poDS->ReadFloat();
}
else
{
VSIFSeekL( poDS->fp, 8 * nValueCount, SEEK_CUR );
}
/* -------------------------------------------------------------------- */
/* Read pairs till we run out, trying to find a few items that */
/* have special meaning to us. */
/* -------------------------------------------------------------------- */
poDS->nRasterXSize = poDS->nRasterYSize = 0;
int nBandCount = 0;
while( poDS->ReadPair( osObjName, nObjCode ) && nObjCode != 254 )
{
if( osObjName == "dim" && nObjCode % 256 == R_INTSXP )
{
int nCount = poDS->ReadInteger();
if( nCount == 2 )
{
poDS->nRasterXSize = poDS->ReadInteger();
poDS->nRasterYSize = poDS->ReadInteger();
nBandCount = 1;
}
else if( nCount == 3 )
{
poDS->nRasterXSize = poDS->ReadInteger();
poDS->nRasterYSize = poDS->ReadInteger();
nBandCount = poDS->ReadInteger();
}
else
{
CPLError( CE_Failure, CPLE_AppDefined,
"R 'dim' dimension wrong." );
delete poDS;
return NULL;
}
}
else if( nObjCode % 256 == R_REALSXP )
{
int nCount = poDS->ReadInteger();
while( nCount-- > 0 && !VSIFEofL(poDS->fp) )
poDS->ReadFloat();
}
else if( nObjCode % 256 == R_INTSXP )
{
int nCount = poDS->ReadInteger();
while( nCount-- > 0 && !VSIFEofL(poDS->fp) )
poDS->ReadInteger();
}
else if( nObjCode % 256 == R_STRSXP )
{
int nCount = poDS->ReadInteger();
while( nCount-- > 0 && !VSIFEofL(poDS->fp) )
poDS->ReadString();
}
else if( nObjCode % 256 == R_CHARSXP )
{
poDS->ReadString();
}
}
if( poDS->nRasterXSize == 0 )
{
delete poDS;
CPLError( CE_Failure, CPLE_AppDefined,
"Failed to find dim dimension information for R dataset." );
return NULL;
}
if (!GDALCheckDatasetDimensions(poDS->nRasterXSize, poDS->nRasterYSize) ||
!GDALCheckBandCount(nBandCount, TRUE))
{
delete poDS;
return NULL;
}
if( nValueCount
< ((GIntBig) nBandCount) * poDS->nRasterXSize * poDS->nRasterYSize )
{
CPLError( CE_Failure, CPLE_AppDefined,
"Not enough pixel data." );
delete poDS;
return NULL;
}
/* -------------------------------------------------------------------- */
/* Create the raster band object(s). */
/* -------------------------------------------------------------------- */
for( int iBand = 0; iBand < nBandCount; iBand++ )
{
GDALRasterBand *poBand;
if( poDS->bASCII )
poBand = new RRasterBand( poDS, iBand+1,
poDS->padfMatrixValues + iBand * poDS->nRasterXSize * poDS->nRasterYSize );
else
poBand = new RawRasterBand( poDS, iBand+1, poDS->fp,
poDS->nStartOfData
+ poDS->nRasterXSize*poDS->nRasterYSize*8*iBand,
8, poDS->nRasterXSize * 8,
GDT_Float64, !CPL_IS_LSB,
TRUE, FALSE );
poDS->SetBand( iBand+1, poBand );
}
/* -------------------------------------------------------------------- */
/* Initialize any PAM information. */
/* -------------------------------------------------------------------- */
poDS->SetDescription( poOpenInfo->pszFilename );
poDS->TryLoadXML();
/* -------------------------------------------------------------------- */
/* Check for overviews. */
/* -------------------------------------------------------------------- */
poDS->oOvManager.Initialize( poDS, poOpenInfo->pszFilename );
return( poDS );
}
GDALDataset *RDataset::Open( GDALOpenInfo * poOpenInfo )
{
#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
if( poOpenInfo->pabyHeader == nullptr )
return nullptr;
#else
// During fuzzing, do not use Identify to reject crazy content.
if( !Identify(poOpenInfo) )
return nullptr;
#endif
// Confirm the requested access is supported.
if( poOpenInfo->eAccess == GA_Update )
{
CPLError(CE_Failure, CPLE_NotSupported,
"The R driver does not support update access to existing"
" datasets.");
return nullptr;
}
// Do we need to route the file through the decompression machinery?
const bool bCompressed =
memcmp(poOpenInfo->pabyHeader, "\037\213\b", 3) == 0;
const CPLString osAdjustedFilename =
std::string(bCompressed ? "/vsigzip/" : "") + poOpenInfo->pszFilename;
// Establish this as a dataset and open the file using VSI*L.
RDataset *poDS = new RDataset();
poDS->fp = VSIFOpenL(osAdjustedFilename, "r");
if( poDS->fp == nullptr )
{
delete poDS;
return nullptr;
}
poDS->bASCII = STARTS_WITH_CI(
reinterpret_cast<char *>(poOpenInfo->pabyHeader), "RDA2\nA\n");
// Confirm this is a version 2 file.
VSIFSeekL(poDS->fp, 7, SEEK_SET);
if( poDS->ReadInteger() != R_LISTSXP )
{
delete poDS;
CPLError(CE_Failure, CPLE_OpenFailed,
"It appears %s is not a version 2 R object file after all!",
poOpenInfo->pszFilename);
return nullptr;
}
// Skip the version values.
poDS->ReadInteger();
poDS->ReadInteger();
// Confirm we have a numeric vector object in a pairlist.
CPLString osObjName;
int nObjCode = 0;
if( !poDS->ReadPair(osObjName, nObjCode) )
{
delete poDS;
return nullptr;
}
if( nObjCode % 256 != R_REALSXP )
{
delete poDS;
CPLError(CE_Failure, CPLE_OpenFailed,
"Failed to find expected numeric vector object.");
return nullptr;
}
poDS->SetMetadataItem("R_OBJECT_NAME", osObjName);
// Read the count.
const int nValueCount = poDS->ReadInteger();
if( nValueCount < 0 )
{
CPLError(
CE_Failure, CPLE_AppDefined, "nValueCount < 0: %d", nValueCount);
delete poDS;
return nullptr;
}
poDS->nStartOfData = VSIFTellL(poDS->fp);
// TODO(schwehr): Factor in the size of doubles.
VSIStatBufL stat;
const int dStatSuccess =
VSIStatExL(osAdjustedFilename, &stat, VSI_STAT_SIZE_FLAG);
if( dStatSuccess != 0 ||
static_cast<vsi_l_offset>(nValueCount) >
stat.st_size - poDS->nStartOfData )
{
CPLError(
CE_Failure, CPLE_AppDefined,
"Corrupt file. "
"Object claims to be larger than available bytes. "
"%d > " CPL_FRMT_GUIB,
nValueCount,
stat.st_size - poDS->nStartOfData);
delete poDS;
return nullptr;
}
// Read/Skip ahead to attributes.
if( poDS->bASCII )
{
poDS->padfMatrixValues =
static_cast<double *>(VSIMalloc2(nValueCount, sizeof(double)));
if (poDS->padfMatrixValues == nullptr)
{
CPLError(CE_Failure, CPLE_AppDefined,
"Cannot allocate %d doubles", nValueCount);
delete poDS;
return nullptr;
}
for( int iValue = 0; iValue < nValueCount; iValue++ )
poDS->padfMatrixValues[iValue] = poDS->ReadFloat();
}
else
{
VSIFSeekL(poDS->fp, 8 * nValueCount, SEEK_CUR);
}
// Read pairs till we run out, trying to find a few items that
// have special meaning to us.
poDS->nRasterXSize = 0;
poDS->nRasterYSize = 0;
int nBandCount = 0;
while( poDS->ReadPair(osObjName, nObjCode) && nObjCode != 254 )
{
if( osObjName == "dim" && nObjCode % 256 == R_INTSXP )
{
const int nCount = poDS->ReadInteger();
if( nCount == 2 )
{
poDS->nRasterXSize = poDS->ReadInteger();
poDS->nRasterYSize = poDS->ReadInteger();
nBandCount = 1;
}
else if( nCount == 3 )
{
poDS->nRasterXSize = poDS->ReadInteger();
poDS->nRasterYSize = poDS->ReadInteger();
nBandCount = poDS->ReadInteger();
}
else
{
CPLError(CE_Failure, CPLE_AppDefined,
"R 'dim' dimension wrong.");
delete poDS;
return nullptr;
}
}
else if( nObjCode % 256 == R_REALSXP )
{
int nCount = poDS->ReadInteger();
while( nCount > 0 && !VSIFEofL(poDS->fp) )
{
nCount --;
poDS->ReadFloat();
}
}
else if( nObjCode % 256 == R_INTSXP )
{
int nCount = poDS->ReadInteger();
while( nCount > 0 && !VSIFEofL(poDS->fp) )
{
nCount --;
poDS->ReadInteger();
}
}
else if( nObjCode % 256 == R_STRSXP )
{
int nCount = poDS->ReadInteger();
while( nCount > 0 && !VSIFEofL(poDS->fp) )
{
nCount --;
poDS->ReadString();
}
}
else if( nObjCode % 256 == R_CHARSXP )
{
poDS->ReadString();
}
}
if( poDS->nRasterXSize == 0 )
{
delete poDS;
CPLError(CE_Failure, CPLE_AppDefined,
"Failed to find dim dimension information for R dataset.");
return nullptr;
}
if (!GDALCheckDatasetDimensions(poDS->nRasterXSize, poDS->nRasterYSize) ||
!GDALCheckBandCount(nBandCount, TRUE))
{
delete poDS;
return nullptr;
}
GIntBig result = 0;
bool ok = SafeMult(nBandCount, poDS->nRasterXSize, &result);
ok &= SafeMult(result, poDS->nRasterYSize, &result);
if( !ok || nValueCount < result )
{
CPLError(CE_Failure, CPLE_AppDefined, "Not enough pixel data.");
delete poDS;
return nullptr;
}
// Create the raster band object(s).
for( int iBand = 0; iBand < nBandCount; iBand++ )
{
GDALRasterBand *poBand = nullptr;
if( poDS->bASCII )
poBand = new RRasterBand(
poDS, iBand + 1,
poDS->padfMatrixValues +
iBand * poDS->nRasterXSize * poDS->nRasterYSize);
else
poBand = new RawRasterBand(
poDS, iBand + 1, poDS->fp,
poDS->nStartOfData +
poDS->nRasterXSize * poDS->nRasterYSize * 8 * iBand,
8, poDS->nRasterXSize * 8,
GDT_Float64, !CPL_IS_LSB,
TRUE, FALSE);
poDS->SetBand(iBand + 1, poBand);
}
// Initialize any PAM information.
poDS->SetDescription(poOpenInfo->pszFilename);
poDS->TryLoadXML();
// Check for overviews.
poDS->oOvManager.Initialize(poDS, poOpenInfo->pszFilename);
return poDS;
}
