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vrtdataset.cpp
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vrtdataset.cpp
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/******************************************************************************
*
* Project: Virtual GDAL Datasets
* Purpose: Implementation of VRTDataset
* Author: Frank Warmerdam <[email protected]>
*
******************************************************************************
* Copyright (c) 2001, Frank Warmerdam <[email protected]>
* Copyright (c) 2007-2014, Even Rouault <even dot rouault at mines-paris dot org>
*
* 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 "vrtdataset.h"
#include "cpl_minixml.h"
#include "cpl_string.h"
#include "gdal_frmts.h"
#include "ogr_spatialref.h"
#include <algorithm>
#include <typeinfo>
#include "gdal_proxy.h"
/*! @cond Doxygen_Suppress */
CPL_CVSID("$Id: vrtdataset.cpp f80e9b875071bda703ec0b6225904f1c17763dd6 2019-11-15 13:58:59 +0100 Even Rouault $")
/************************************************************************/
/* VRTDataset() */
/************************************************************************/
VRTDataset::VRTDataset( int nXSize, int nYSize ) :
m_pszProjection(nullptr),
m_bGeoTransformSet(FALSE),
m_nGCPCount(0),
m_pasGCPList(nullptr),
m_pszGCPProjection(nullptr),
m_bNeedsFlush(FALSE),
m_bWritable(TRUE),
m_pszVRTPath(nullptr),
m_poMaskBand(nullptr),
m_bCompatibleForDatasetIO(-1),
m_papszXMLVRTMetadata(nullptr)
{
nRasterXSize = nXSize;
nRasterYSize = nYSize;
m_adfGeoTransform[0] = 0.0;
m_adfGeoTransform[1] = 1.0;
m_adfGeoTransform[2] = 0.0;
m_adfGeoTransform[3] = 0.0;
m_adfGeoTransform[4] = 0.0;
m_adfGeoTransform[5] = 1.0;
GDALRegister_VRT();
poDriver = reinterpret_cast<GDALDriver *>( GDALGetDriverByName( "VRT" ) );
}
/*! @endcond */
/************************************************************************/
/* VRTCreate() */
/************************************************************************/
/**
* @see VRTDataset::VRTDataset()
*/
VRTDatasetH CPL_STDCALL VRTCreate(int nXSize, int nYSize)
{
return new VRTDataset(nXSize, nYSize);
}
/*! @cond Doxygen_Suppress */
/************************************************************************/
/* ~VRTDataset() */
/************************************************************************/
VRTDataset::~VRTDataset()
{
VRTDataset::FlushCache();
CPLFree( m_pszProjection );
CPLFree( m_pszGCPProjection );
if( m_nGCPCount > 0 )
{
GDALDeinitGCPs( m_nGCPCount, m_pasGCPList );
CPLFree( m_pasGCPList );
}
CPLFree( m_pszVRTPath );
delete m_poMaskBand;
for(size_t i=0;i<m_apoOverviews.size();i++)
delete m_apoOverviews[i];
for(size_t i=0;i<m_apoOverviewsBak.size();i++)
delete m_apoOverviewsBak[i];
CSLDestroy( m_papszXMLVRTMetadata );
}
/************************************************************************/
/* FlushCache() */
/************************************************************************/
void VRTDataset::FlushCache()
{
VRTFlushCacheStruct<VRTDataset>::FlushCache(*this);
}
/************************************************************************/
/* FlushCache() */
/************************************************************************/
void VRTWarpedDataset::FlushCache()
{
VRTFlushCacheStruct<VRTWarpedDataset>::FlushCache(*this);
}
/************************************************************************/
/* FlushCache() */
/************************************************************************/
void VRTPansharpenedDataset::FlushCache()
{
VRTFlushCacheStruct<VRTPansharpenedDataset>::FlushCache(*this);
}
/************************************************************************/
/* FlushCache() */
/************************************************************************/
template<class T> void VRTFlushCacheStruct<T>::FlushCache(T& obj)
{
obj.GDALDataset::FlushCache();
if( !obj.m_bNeedsFlush || obj.m_bWritable == FALSE)
return;
obj.m_bNeedsFlush = FALSE;
// We don't write to disk if there is no filename. This is a
// memory only dataset.
if( strlen(obj.GetDescription()) == 0
|| STARTS_WITH_CI(obj.GetDescription(), "<VRTDataset") )
return;
/* -------------------------------------------------------------------- */
/* Create the output file. */
/* -------------------------------------------------------------------- */
VSILFILE *fpVRT = VSIFOpenL( obj.GetDescription(), "w" );
if( fpVRT == nullptr )
{
CPLError( CE_Failure, CPLE_AppDefined,
"Failed to write .vrt file in FlushCache()." );
return;
}
/* -------------------------------------------------------------------- */
/* Convert tree to a single block of XML text. */
/* -------------------------------------------------------------------- */
const char* pszDescription = obj.GetDescription();
char *l_pszVRTPath = CPLStrdup(
pszDescription[0] && !STARTS_WITH(pszDescription, "<VRTDataset") ?
CPLGetPath(pszDescription): "" );
CPLXMLNode *psDSTree = obj.T::SerializeToXML( l_pszVRTPath );
char *pszXML = CPLSerializeXMLTree( psDSTree );
CPLDestroyXMLNode( psDSTree );
CPLFree( l_pszVRTPath );
bool bOK = true;
if( pszXML )
{
/* ------------------------------------------------------------------ */
/* Write to disk. */
/* ------------------------------------------------------------------ */
bOK &=
VSIFWriteL( pszXML, 1, strlen(pszXML), fpVRT )
== strlen(pszXML);
CPLFree(pszXML);
}
if( VSIFCloseL( fpVRT ) != 0 )
bOK = false;
if( !bOK )
{
CPLError( CE_Failure, CPLE_AppDefined,
"Failed to write .vrt file in FlushCache()." );
return;
}
}
/************************************************************************/
/* GetMetadata() */
/************************************************************************/
char** VRTDataset::GetMetadata( const char *pszDomain )
{
if( pszDomain != nullptr && EQUAL(pszDomain, "xml:VRT") )
{
/* ------------------------------------------------------------------ */
/* Convert tree to a single block of XML text. */
/* ------------------------------------------------------------------ */
const char* pszDescription = GetDescription();
char *l_pszVRTPath = CPLStrdup(
pszDescription[0] && !STARTS_WITH(pszDescription, "<VRTDataset") ?
CPLGetPath(pszDescription): "" );
CPLXMLNode *psDSTree = SerializeToXML( l_pszVRTPath );
char *pszXML = CPLSerializeXMLTree( psDSTree );
CPLDestroyXMLNode( psDSTree );
CPLFree( l_pszVRTPath );
CSLDestroy(m_papszXMLVRTMetadata);
m_papszXMLVRTMetadata = static_cast<char**>(CPLMalloc(2 * sizeof(char*)));
m_papszXMLVRTMetadata[0] = pszXML;
m_papszXMLVRTMetadata[1] = nullptr;
return m_papszXMLVRTMetadata;
}
return GDALDataset::GetMetadata(pszDomain);
}
/*! @endcond */
/************************************************************************/
/* VRTFlushCache() */
/************************************************************************/
/**
* @see VRTDataset::FlushCache()
*/
void CPL_STDCALL VRTFlushCache( VRTDatasetH hDataset )
{
VALIDATE_POINTER0( hDataset, "VRTFlushCache" );
reinterpret_cast<VRTDataset *>( hDataset )->FlushCache();
}
/*! @cond Doxygen_Suppress */
/************************************************************************/
/* SerializeToXML() */
/************************************************************************/
CPLXMLNode *VRTDataset::SerializeToXML( const char *pszVRTPathIn )
{
/* -------------------------------------------------------------------- */
/* Setup root node and attributes. */
/* -------------------------------------------------------------------- */
CPLXMLNode *psDSTree = CPLCreateXMLNode( nullptr, CXT_Element, "VRTDataset" );
char szNumber[128] = { '\0' };
snprintf( szNumber, sizeof(szNumber), "%d", GetRasterXSize() );
CPLSetXMLValue( psDSTree, "#rasterXSize", szNumber );
snprintf( szNumber, sizeof(szNumber), "%d", GetRasterYSize() );
CPLSetXMLValue( psDSTree, "#rasterYSize", szNumber );
/* -------------------------------------------------------------------- */
/* SRS */
/* -------------------------------------------------------------------- */
if( m_pszProjection != nullptr && strlen(m_pszProjection) > 0 )
CPLSetXMLValue( psDSTree, "SRS", m_pszProjection );
/* -------------------------------------------------------------------- */
/* Geotransform. */
/* -------------------------------------------------------------------- */
if( m_bGeoTransformSet )
{
CPLSetXMLValue(
psDSTree, "GeoTransform",
CPLSPrintf( "%24.16e,%24.16e,%24.16e,%24.16e,%24.16e,%24.16e",
m_adfGeoTransform[0],
m_adfGeoTransform[1],
m_adfGeoTransform[2],
m_adfGeoTransform[3],
m_adfGeoTransform[4],
m_adfGeoTransform[5] ) );
}
/* -------------------------------------------------------------------- */
/* Metadata */
/* -------------------------------------------------------------------- */
CPLXMLNode *psMD = oMDMD.Serialize();
if( psMD != nullptr )
{
CPLAddXMLChild( psDSTree, psMD );
}
/* -------------------------------------------------------------------- */
/* GCPs */
/* -------------------------------------------------------------------- */
if( m_nGCPCount > 0 )
{
GDALSerializeGCPListToXML( psDSTree,
m_pasGCPList,
m_nGCPCount,
m_pszGCPProjection );
}
/* -------------------------------------------------------------------- */
/* Serialize bands. */
/* -------------------------------------------------------------------- */
CPLXMLNode* psLastChild = psDSTree->psChild;
for( ; psLastChild != nullptr && psLastChild->psNext;
psLastChild = psLastChild->psNext )
{
}
CPLAssert(psLastChild); // we have at least rasterXSize
for( int iBand = 0; iBand < nBands; iBand++ )
{
CPLXMLNode *psBandTree =
reinterpret_cast<VRTRasterBand *>(
papoBands[iBand])->SerializeToXML( pszVRTPathIn );
if( psBandTree != nullptr )
{
psLastChild->psNext = psBandTree;
psLastChild = psBandTree;
}
}
/* -------------------------------------------------------------------- */
/* Serialize dataset mask band. */
/* -------------------------------------------------------------------- */
if( m_poMaskBand )
{
CPLXMLNode *psBandTree =
m_poMaskBand->SerializeToXML(pszVRTPathIn);
if( psBandTree != nullptr )
{
CPLXMLNode *psMaskBandElement
= CPLCreateXMLNode( psDSTree, CXT_Element, "MaskBand" );
CPLAddXMLChild( psMaskBandElement, psBandTree );
}
}
return psDSTree;
}
/*! @endcond */
/************************************************************************/
/* VRTSerializeToXML() */
/************************************************************************/
/**
* @see VRTDataset::SerializeToXML()
*/
CPLXMLNode * CPL_STDCALL VRTSerializeToXML( VRTDatasetH hDataset,
const char *pszVRTPath )
{
VALIDATE_POINTER1( hDataset, "VRTSerializeToXML", nullptr );
return reinterpret_cast<VRTDataset *>(
hDataset )->SerializeToXML(pszVRTPath);
}
/*! @cond Doxygen_Suppress */
/************************************************************************/
/* InitBand() */
/************************************************************************/
VRTRasterBand* VRTDataset::InitBand(const char* pszSubclass, int nBand,
bool bAllowPansharpened)
{
VRTRasterBand *poBand = nullptr;
if( EQUAL(pszSubclass,"VRTSourcedRasterBand") )
poBand = new VRTSourcedRasterBand( this, nBand );
else if( EQUAL(pszSubclass, "VRTDerivedRasterBand") )
poBand = new VRTDerivedRasterBand( this, nBand );
else if( EQUAL(pszSubclass, "VRTRawRasterBand") )
poBand = new VRTRawRasterBand( this, nBand );
else if( EQUAL(pszSubclass, "VRTWarpedRasterBand") &&
dynamic_cast<VRTWarpedDataset*>(this) != nullptr )
poBand = new VRTWarpedRasterBand( this, nBand );
else if( bAllowPansharpened &&
EQUAL(pszSubclass, "VRTPansharpenedRasterBand") &&
dynamic_cast<VRTPansharpenedDataset*>(this) != nullptr )
poBand = new VRTPansharpenedRasterBand( this, nBand);
else
CPLError( CE_Failure, CPLE_AppDefined,
"VRTRasterBand of unrecognized subclass '%s'.",
pszSubclass );
return poBand;
}
/************************************************************************/
/* XMLInit() */
/************************************************************************/
CPLErr VRTDataset::XMLInit( CPLXMLNode *psTree, const char *pszVRTPathIn )
{
if( pszVRTPathIn != nullptr )
m_pszVRTPath = CPLStrdup(pszVRTPathIn);
/* -------------------------------------------------------------------- */
/* Check for an SRS node. */
/* -------------------------------------------------------------------- */
if( strlen(CPLGetXMLValue(psTree, "SRS", "")) > 0 )
{
CPLFree( m_pszProjection );
m_pszProjection = nullptr;
OGRSpatialReference oSRS;
if( oSRS.SetFromUserInput( CPLGetXMLValue(psTree, "SRS", "") )
== OGRERR_NONE )
oSRS.exportToWkt( &m_pszProjection );
}
/* -------------------------------------------------------------------- */
/* Check for a GeoTransform node. */
/* -------------------------------------------------------------------- */
if( strlen(CPLGetXMLValue(psTree, "GeoTransform", "")) > 0 )
{
const char *pszGT = CPLGetXMLValue(psTree, "GeoTransform", "");
char **papszTokens
= CSLTokenizeStringComplex( pszGT, ",", FALSE, FALSE );
if( CSLCount(papszTokens) != 6 )
{
CPLError( CE_Warning, CPLE_AppDefined,
"GeoTransform node does not have expected six values.");
}
else
{
for( int iTA = 0; iTA < 6; iTA++ )
m_adfGeoTransform[iTA] = CPLAtof(papszTokens[iTA]);
m_bGeoTransformSet = TRUE;
}
CSLDestroy( papszTokens );
}
/* -------------------------------------------------------------------- */
/* Check for GCPs. */
/* -------------------------------------------------------------------- */
CPLXMLNode *psGCPList = CPLGetXMLNode( psTree, "GCPList" );
if( psGCPList != nullptr )
{
GDALDeserializeGCPListFromXML( psGCPList,
&m_pasGCPList,
&m_nGCPCount,
&m_pszGCPProjection );
}
/* -------------------------------------------------------------------- */
/* Apply any dataset level metadata. */
/* -------------------------------------------------------------------- */
oMDMD.XMLInit( psTree, TRUE );
/* -------------------------------------------------------------------- */
/* Create dataset mask band. */
/* -------------------------------------------------------------------- */
/* Parse dataset mask band first */
CPLXMLNode* psMaskBandNode = CPLGetXMLNode(psTree, "MaskBand");
CPLXMLNode *psChild = nullptr;
if( psMaskBandNode )
psChild = psMaskBandNode->psChild;
else
psChild = nullptr;
for( ; psChild != nullptr; psChild=psChild->psNext )
{
if( psChild->eType == CXT_Element
&& EQUAL(psChild->pszValue,"VRTRasterBand") )
{
const char *pszSubclass = CPLGetXMLValue( psChild, "subclass",
"VRTSourcedRasterBand" );
VRTRasterBand *poBand = InitBand(pszSubclass, 0, false);
if( poBand != nullptr
&& poBand->XMLInit( psChild, pszVRTPathIn, this ) == CE_None )
{
SetMaskBand(poBand);
break;
}
else
{
delete poBand;
return CE_Failure;
}
}
}
/* -------------------------------------------------------------------- */
/* Create band information objects. */
/* -------------------------------------------------------------------- */
int l_nBands = 0;
for( psChild=psTree->psChild; psChild != nullptr; psChild=psChild->psNext )
{
if( psChild->eType == CXT_Element
&& EQUAL(psChild->pszValue,"VRTRasterBand") )
{
const char *pszSubclass = CPLGetXMLValue( psChild, "subclass",
"VRTSourcedRasterBand" );
VRTRasterBand *poBand = InitBand(pszSubclass, l_nBands+1, true);
if( poBand != nullptr
&& poBand->XMLInit( psChild, pszVRTPathIn, this ) == CE_None )
{
l_nBands ++;
SetBand( l_nBands, poBand );
}
else
{
delete poBand;
return CE_Failure;
}
}
}
return CE_None;
}
/************************************************************************/
/* GetGCPCount() */
/************************************************************************/
int VRTDataset::GetGCPCount()
{
return m_nGCPCount;
}
/************************************************************************/
/* GetGCPProjection() */
/************************************************************************/
const char *VRTDataset::GetGCPProjection()
{
if( m_pszGCPProjection == nullptr )
return "";
return m_pszGCPProjection;
}
/************************************************************************/
/* GetGCPs() */
/************************************************************************/
const GDAL_GCP *VRTDataset::GetGCPs()
{
return m_pasGCPList;
}
/************************************************************************/
/* SetGCPs() */
/************************************************************************/
CPLErr VRTDataset::SetGCPs( int nGCPCountIn, const GDAL_GCP *pasGCPListIn,
const char *pszGCPProjectionIn )
{
CPLFree( m_pszGCPProjection );
if( m_nGCPCount > 0 )
{
GDALDeinitGCPs( m_nGCPCount, m_pasGCPList );
CPLFree( m_pasGCPList );
}
m_pszGCPProjection = CPLStrdup(pszGCPProjectionIn);
m_nGCPCount = nGCPCountIn;
m_pasGCPList = GDALDuplicateGCPs( nGCPCountIn, pasGCPListIn );
m_bNeedsFlush = TRUE;
return CE_None;
}
/************************************************************************/
/* SetProjection() */
/************************************************************************/
CPLErr VRTDataset::SetProjection( const char *pszWKT )
{
CPLFree( m_pszProjection );
m_pszProjection = nullptr;
if( pszWKT != nullptr )
m_pszProjection = CPLStrdup(pszWKT);
m_bNeedsFlush = TRUE;
return CE_None;
}
/************************************************************************/
/* GetProjectionRef() */
/************************************************************************/
const char *VRTDataset::GetProjectionRef()
{
if( m_pszProjection == nullptr )
return "";
return m_pszProjection;
}
/************************************************************************/
/* SetGeoTransform() */
/************************************************************************/
CPLErr VRTDataset::SetGeoTransform( double *padfGeoTransformIn )
{
memcpy( m_adfGeoTransform, padfGeoTransformIn, sizeof(double) * 6 );
m_bGeoTransformSet = TRUE;
m_bNeedsFlush = TRUE;
return CE_None;
}
/************************************************************************/
/* GetGeoTransform() */
/************************************************************************/
CPLErr VRTDataset::GetGeoTransform( double * padfGeoTransform )
{
memcpy( padfGeoTransform, m_adfGeoTransform, sizeof(double) * 6 );
return m_bGeoTransformSet ? CE_None : CE_Failure;
}
/************************************************************************/
/* SetMetadata() */
/************************************************************************/
CPLErr VRTDataset::SetMetadata( char **papszMetadata,
const char *pszDomain )
{
SetNeedsFlush();
return GDALDataset::SetMetadata( papszMetadata, pszDomain );
}
/************************************************************************/
/* SetMetadataItem() */
/************************************************************************/
CPLErr VRTDataset::SetMetadataItem( const char *pszName,
const char *pszValue,
const char *pszDomain )
{
SetNeedsFlush();
return GDALDataset::SetMetadataItem( pszName, pszValue, pszDomain );
}
/************************************************************************/
/* Identify() */
/************************************************************************/
int VRTDataset::Identify( GDALOpenInfo * poOpenInfo )
{
if( poOpenInfo->nHeaderBytes > 20
&& strstr((const char *)poOpenInfo->pabyHeader,"<VRTDataset") != nullptr )
return TRUE;
if( strstr(poOpenInfo->pszFilename,"<VRTDataset") != nullptr )
return TRUE;
return FALSE;
}
/************************************************************************/
/* Open() */
/************************************************************************/
GDALDataset *VRTDataset::Open( GDALOpenInfo * poOpenInfo )
{
/* -------------------------------------------------------------------- */
/* Does this appear to be a virtual dataset definition XML */
/* file? */
/* -------------------------------------------------------------------- */
if( !Identify( poOpenInfo ) )
return nullptr;
/* -------------------------------------------------------------------- */
/* Try to read the whole file into memory. */
/* -------------------------------------------------------------------- */
char *pszXML = nullptr;
VSILFILE *fp = poOpenInfo->fpL;
char *pszVRTPath = nullptr;
if( fp != nullptr )
{
poOpenInfo->fpL = nullptr;
GByte* pabyOut = nullptr;
if( !VSIIngestFile( fp, poOpenInfo->pszFilename, &pabyOut,
nullptr, INT_MAX - 1 ) )
{
CPL_IGNORE_RET_VAL(VSIFCloseL(fp));
return nullptr;
}
pszXML = reinterpret_cast<char*>(pabyOut);
char* pszCurDir = CPLGetCurrentDir();
const char *currentVrtFilename
= CPLProjectRelativeFilename(pszCurDir, poOpenInfo->pszFilename);
CPLString osInitialCurrentVrtFilename(currentVrtFilename);
CPLFree(pszCurDir);
#if defined(HAVE_READLINK) && defined(HAVE_LSTAT)
char filenameBuffer[2048];
while( true ) {
VSIStatBuf statBuffer;
int lstatCode = lstat( currentVrtFilename, &statBuffer );
if( lstatCode == -1 ) {
if( errno == ENOENT )
{
// File could be a virtual file, let later checks handle it.
break;
}
else
{
CPL_IGNORE_RET_VAL(VSIFCloseL(fp));
CPLFree( pszXML );
CPLError( CE_Failure, CPLE_FileIO,
"Failed to lstat %s: %s",
currentVrtFilename,
VSIStrerror(errno) );
return nullptr;
}
}
if( !VSI_ISLNK(statBuffer.st_mode) ) {
break;
}
const int bufferSize = static_cast<int>(
readlink( currentVrtFilename,
filenameBuffer,
sizeof(filenameBuffer) ) );
if( bufferSize != -1 )
{
filenameBuffer[std::min(bufferSize, static_cast<int>(
sizeof(filenameBuffer) ) - 1)] = 0;
// The filename in filenameBuffer might be a relative path
// from the linkfile resolve it before looping
currentVrtFilename = CPLProjectRelativeFilename(
CPLGetDirname( currentVrtFilename ), filenameBuffer);
}
else
{
CPL_IGNORE_RET_VAL(VSIFCloseL(fp));
CPLFree( pszXML );
CPLError( CE_Failure, CPLE_FileIO,
"Failed to read filename from symlink %s: %s",
currentVrtFilename,
VSIStrerror(errno) );
return nullptr;
}
}
#endif // HAVE_READLINK && HAVE_LSTAT
if( osInitialCurrentVrtFilename == currentVrtFilename )
pszVRTPath = CPLStrdup(CPLGetPath(poOpenInfo->pszFilename));
else
pszVRTPath = CPLStrdup(CPLGetPath(currentVrtFilename));
CPL_IGNORE_RET_VAL(VSIFCloseL(fp));
}
/* -------------------------------------------------------------------- */
/* Or use the filename as the XML input. */
/* -------------------------------------------------------------------- */
else
{
pszXML = CPLStrdup( poOpenInfo->pszFilename );
}
if( CSLFetchNameValue(poOpenInfo->papszOpenOptions, "ROOT_PATH") != nullptr )
{
CPLFree(pszVRTPath);
pszVRTPath = CPLStrdup(
CSLFetchNameValue( poOpenInfo->papszOpenOptions, "ROOT_PATH" ) );
}
/* -------------------------------------------------------------------- */
/* Turn the XML representation into a VRTDataset. */
/* -------------------------------------------------------------------- */
VRTDataset *poDS = reinterpret_cast<VRTDataset *>(
OpenXML( pszXML, pszVRTPath, poOpenInfo->eAccess ) );
if( poDS != nullptr )
poDS->m_bNeedsFlush = FALSE;
CPLFree( pszXML );
CPLFree( pszVRTPath );
/* -------------------------------------------------------------------- */
/* Initialize info for later overview discovery. */
/* -------------------------------------------------------------------- */
if( fp != nullptr && poDS != nullptr )
{
poDS->oOvManager.Initialize( poDS, poOpenInfo->pszFilename );
if( poOpenInfo->AreSiblingFilesLoaded() )
poDS->oOvManager.TransferSiblingFiles(
poOpenInfo->StealSiblingFiles() );
}
return poDS;
}
/************************************************************************/
/* OpenXML() */
/* */
/* Create an open VRTDataset from a supplied XML representation */
/* of the dataset. */
/************************************************************************/
GDALDataset *VRTDataset::OpenXML( const char *pszXML, const char *pszVRTPath,
GDALAccess eAccess)
{
/* -------------------------------------------------------------------- */
/* Parse the XML. */
/* -------------------------------------------------------------------- */
CPLXMLTreeCloser psTree(CPLParseXMLString( pszXML ));
if( psTree == nullptr )
return nullptr;
CPLXMLNode *psRoot = CPLGetXMLNode( psTree.get(), "=VRTDataset" );
if( psRoot == nullptr )
{
CPLError( CE_Failure, CPLE_AppDefined,
"Missing VRTDataset element." );
return nullptr;
}
const char* pszSubClass = CPLGetXMLValue(psRoot, "subClass", "");
const bool bIsPansharpened =
strcmp(pszSubClass, "VRTPansharpenedDataset" ) == 0;
if( !bIsPansharpened &&
(CPLGetXMLNode( psRoot, "rasterXSize" ) == nullptr
|| CPLGetXMLNode( psRoot, "rasterYSize" ) == nullptr
|| CPLGetXMLNode( psRoot, "VRTRasterBand" ) == nullptr) )
{
CPLError( CE_Failure, CPLE_AppDefined,
"Missing one of rasterXSize, rasterYSize or bands on"
" VRTDataset." );
return nullptr;
}
/* -------------------------------------------------------------------- */
/* Create the new virtual dataset object. */
/* -------------------------------------------------------------------- */
const int nXSize = atoi(CPLGetXMLValue(psRoot, "rasterXSize","0"));
const int nYSize = atoi(CPLGetXMLValue(psRoot, "rasterYSize","0"));
if( !bIsPansharpened &&
!GDALCheckDatasetDimensions( nXSize, nYSize ) )
{
return nullptr;
}
VRTDataset *poDS = nullptr;
if( strcmp(pszSubClass, "VRTWarpedDataset") == 0 )
poDS = new VRTWarpedDataset( nXSize, nYSize );
else if( bIsPansharpened )
poDS = new VRTPansharpenedDataset( nXSize, nYSize );
else
{
poDS = new VRTDataset( nXSize, nYSize );
poDS->eAccess = eAccess;
}
if( poDS->XMLInit( psRoot, pszVRTPath ) != CE_None )
{
delete poDS;
poDS = nullptr;
}
/* -------------------------------------------------------------------- */
/* Try to return a regular handle on the file. */
/* -------------------------------------------------------------------- */
return poDS;
}
/************************************************************************/
/* AddBand() */
/************************************************************************/
CPLErr VRTDataset::AddBand( GDALDataType eType, char **papszOptions )
{
m_bNeedsFlush = TRUE;
/* ==================================================================== */
/* Handle a new raw band. */
/* ==================================================================== */
const char *pszSubClass = CSLFetchNameValue(papszOptions, "subclass");
if( pszSubClass != nullptr && EQUAL(pszSubClass,"VRTRawRasterBand") )
{
const int nWordDataSize = GDALGetDataTypeSizeBytes( eType );
/* -------------------------------------------------------------------- */
/* Collect required information. */
/* -------------------------------------------------------------------- */
const char* pszImageOffset =
CSLFetchNameValueDef(papszOptions, "ImageOffset", "0");
vsi_l_offset nImageOffset = CPLScanUIntBig(
pszImageOffset, static_cast<int>(strlen(pszImageOffset)) );
int nPixelOffset = nWordDataSize;
const char* pszPixelOffset =
CSLFetchNameValue(papszOptions, "PixelOffset");
if( pszPixelOffset != nullptr )
nPixelOffset = atoi(pszPixelOffset);
int nLineOffset;
const char* pszLineOffset =
CSLFetchNameValue(papszOptions, "LineOffset");
if( pszLineOffset != nullptr )
nLineOffset = atoi(pszLineOffset);
else
{
if( nPixelOffset > INT_MAX / GetRasterXSize() ||
nPixelOffset < INT_MIN / GetRasterXSize() )
{
CPLError( CE_Failure, CPLE_AppDefined, "Int overflow");
return CE_Failure;
}
nLineOffset = nPixelOffset * GetRasterXSize();
}
const char *pszByteOrder =
CSLFetchNameValue(papszOptions, "ByteOrder");
const char *pszFilename =
CSLFetchNameValue(papszOptions, "SourceFilename");
if( pszFilename == nullptr )
{
CPLError( CE_Failure, CPLE_AppDefined,
"AddBand() requires a SourceFilename option for "
"VRTRawRasterBands." );
return CE_Failure;
}
const bool bRelativeToVRT =
CPLFetchBool( papszOptions, "relativeToVRT", false );
/* -------------------------------------------------------------------- */
/* Create and initialize the band. */
/* -------------------------------------------------------------------- */
VRTRawRasterBand *poBand =
new VRTRawRasterBand( this, GetRasterCount() + 1, eType );