OGRErr OGRGeometryCollection::importFromWkb( unsigned char * pabyData,
                                             int nSize )

{
    OGRwkbByteOrder     eByteOrder;
    int                 nDataOffset;
    
    if( nSize < 9 && nSize != -1 )
        return OGRERR_NOT_ENOUGH_DATA;

/* -------------------------------------------------------------------- */
/*      Get the byte order byte.                                        */
/* -------------------------------------------------------------------- */
    eByteOrder = DB2_V72_FIX_BYTE_ORDER((OGRwkbByteOrder) *pabyData);
    CPLAssert( eByteOrder == wkbXDR || eByteOrder == wkbNDR );

/* -------------------------------------------------------------------- */
/*      Get the geometry feature type.  For now we assume that          */
/*      geometry type is between 0 and 255 so we only have to fetch     */
/*      one byte.                                                       */
/* -------------------------------------------------------------------- */
#ifdef DEBUG
    OGRwkbGeometryType eGeometryType;

    if( eByteOrder == wkbNDR )
    {
        eGeometryType = (OGRwkbGeometryType) pabyData[1];
    }
    else
    {
        eGeometryType = (OGRwkbGeometryType) pabyData[4];
    }

    CPLAssert( eGeometryType == wkbGeometryCollection
               || eGeometryType == wkbMultiPolygon 
               || eGeometryType == wkbMultiLineString 
               || eGeometryType == wkbMultiPoint );
#endif    

/* -------------------------------------------------------------------- */
/*      Clear existing Geoms.                                           */
/* -------------------------------------------------------------------- */
    empty();
    
/* -------------------------------------------------------------------- */
/*      Get the geometry count.                                         */
/* -------------------------------------------------------------------- */
    memcpy( &nGeomCount, pabyData + 5, 4 );
    
    if( OGR_SWAP( eByteOrder ) )
        nGeomCount = CPL_SWAP32(nGeomCount);

    papoGeoms = (OGRGeometry **) OGRMalloc(sizeof(void*) * nGeomCount);

    nDataOffset = 9;
    if( nSize != -1 )
        nSize -= nDataOffset;

/* -------------------------------------------------------------------- */
/*      Get the Geoms.                                                  */
/* -------------------------------------------------------------------- */
    for( int iGeom = 0; iGeom < nGeomCount; iGeom++ )
    {
        OGRErr  eErr;

        eErr = OGRGeometryFactory::
            createFromWkb( pabyData + nDataOffset, NULL,
                           papoGeoms + iGeom, nSize );

        if( eErr != OGRERR_NONE )
        {
            nGeomCount = iGeom;
            return eErr;
        }

        if (papoGeoms[iGeom]->getCoordinateDimension() == 3)
            nCoordDimension = 3;

        if( nSize != -1 )
            nSize -= papoGeoms[iGeom]->WkbSize();

        nDataOffset += papoGeoms[iGeom]->WkbSize();
    }
    
    return OGRERR_NONE;
}

OGRFeature *OGROGDILayer::GetNextRawFeature()
{
    ecs_Result  *psResult;
    int         i;
    OGRFeature  *poFeature;

/* -------------------------------------------------------------------- */
/*      Retrieve object from OGDI server and create new feature         */
/* -------------------------------------------------------------------- */

    psResult = cln_GetNextObject(m_nClientID);
    if (! ECSSUCCESS(psResult))
    {
        // We probably reached EOF... keep track of shape count.
        m_nTotalShapeCount = m_iNextShapeId - m_nFilteredOutShapes;
        return NULL;
    }
   
    poFeature = new OGRFeature(m_poFeatureDefn);

    poFeature->SetFID( m_iNextShapeId++ );
    m_nFeaturesRead++;

/* -------------------------------------------------------------------- */
/*      Process geometry                                                */
/* -------------------------------------------------------------------- */
    if (m_eFamily == Point)
    {
        ecs_Point       *psPoint = &(ECSGEOM(psResult).point);
        OGRPoint        *poOGRPoint = new OGRPoint(psPoint->c.x, psPoint->c.y);

        poOGRPoint->assignSpatialReference(m_poSpatialRef);
        poFeature->SetGeometryDirectly(poOGRPoint);
    }
    else if (m_eFamily == Line)
    {
        ecs_Line        *psLine = &(ECSGEOM(psResult).line);
        OGRLineString   *poOGRLine = new OGRLineString();

        poOGRLine->setNumPoints( psLine->c.c_len );

        for( i=0; i < (int) psLine->c.c_len; i++ ) 
        {
            poOGRLine->setPoint(i, psLine->c.c_val[i].x, psLine->c.c_val[i].y);
        }

        poOGRLine->assignSpatialReference(m_poSpatialRef);
        poFeature->SetGeometryDirectly(poOGRLine);
    }
    else if (m_eFamily == Area)
    {
        ecs_Area        *psArea = &(ECSGEOM(psResult).area);
        OGRPolygon      *poOGRPolygon = new OGRPolygon();

        for(int iRing=0; iRing < (int) psArea->ring.ring_len; iRing++)
        {
            ecs_FeatureRing     *psRing = &(psArea->ring.ring_val[iRing]);
            OGRLinearRing       *poOGRRing = new OGRLinearRing();

            poOGRRing->setNumPoints( psRing->c.c_len );

            for( i=0; i < (int) psRing->c.c_len; i++ ) 
            {
                poOGRRing->setPoint(i, psRing->c.c_val[i].x, 
                                    psRing->c.c_val[i].y);
            }
            poOGRPolygon->addRingDirectly(poOGRRing);
        }

        // __TODO__
        // When OGR supports polygon centroids then we should carry them here

        poOGRPolygon->assignSpatialReference(m_poSpatialRef);
        poFeature->SetGeometryDirectly(poOGRPolygon);
    }
    else if (m_eFamily == Text)
    {
        // __TODO__
        // For now text is treated as a point and string is lost
        //
        ecs_Text       *psText = &(ECSGEOM(psResult).text);
        OGRPoint        *poOGRPoint = new OGRPoint(psText->c.x, psText->c.y);

        poOGRPoint->assignSpatialReference(m_poSpatialRef);
        poFeature->SetGeometryDirectly(poOGRPoint);
    }
    else
    {
        CPLAssert(FALSE);
    }

/* -------------------------------------------------------------------- */
/*      Set attributes                                                  */
/* -------------------------------------------------------------------- */
    char *pszAttrList = ECSOBJECTATTR(psResult);

    for( int iField = 0; iField < m_poFeatureDefn->GetFieldCount(); iField++ )
    {
        char        *pszFieldStart;
        int         nNameLen;
//.........这里部分代码省略.........

OGRErr OGRLineString::importFromWkb( unsigned char * pabyData,
                                     int nSize )

{
    OGRwkbByteOrder     eByteOrder;

    if( nSize < 21 && nSize != -1 )
        return OGRERR_NOT_ENOUGH_DATA;

/* -------------------------------------------------------------------- */
/*      Get the byte order byte.                                        */
/* -------------------------------------------------------------------- */
    eByteOrder = DB2_V72_FIX_BYTE_ORDER((OGRwkbByteOrder) *pabyData);
    assert( eByteOrder == wkbXDR || eByteOrder == wkbNDR );

/* -------------------------------------------------------------------- */
/*      Get the geometry feature type.  For now we assume that          */
/*      geometry type is between 0 and 255 so we only have to fetch     */
/*      one byte.                                                       */
/* -------------------------------------------------------------------- */
    OGRwkbGeometryType eGeometryType;
    int                bIs3D;

    if( eByteOrder == wkbNDR )
    {
        eGeometryType = (OGRwkbGeometryType) pabyData[1];
        bIs3D = pabyData[4] & 0x80 || pabyData[2] & 0x80;
    }
    else
    {
        eGeometryType = (OGRwkbGeometryType) pabyData[4];
        bIs3D = pabyData[1] & 0x80 || pabyData[3] & 0x80;
    }
#ifdef __WXOSX__
    assert( eGeometryType == wkbLineString );
#else
    CPLAssert( eGeometryType == wkbLineString );
#endif
/* -------------------------------------------------------------------- */
/*      Get the vertex count.                                           */
/* -------------------------------------------------------------------- */
    int         nNewNumPoints;

    memcpy( &nNewNumPoints, pabyData + 5, 4 );

    if( OGR_SWAP( eByteOrder ) )
        nNewNumPoints = CPL_SWAP32(nNewNumPoints);

    setNumPoints( nNewNumPoints );

    if( bIs3D )
        Make3D();
    else
        Make2D();

/* -------------------------------------------------------------------- */
/*      Get the vertex.                                                 */
/* -------------------------------------------------------------------- */
    int         i;

    if( bIs3D )
    {
        for( i = 0; i < nPointCount; i++ )
        {
            memcpy( paoPoints + i, pabyData + 9 + i*24, 16 );
            memcpy( padfZ + i, pabyData + 9 + 16 + i*24, 8 );
        }
    }
    else
    {
        memcpy( paoPoints, pabyData + 9, 16 * nPointCount );
    }

/* -------------------------------------------------------------------- */
/*      Byte swap if needed.                                            */
/* -------------------------------------------------------------------- */
    if( OGR_SWAP( eByteOrder ) )
    {
        for( i = 0; i < nPointCount; i++ )
        {
            CPL_SWAPDOUBLE( &(paoPoints[i].x) );
            CPL_SWAPDOUBLE( &(paoPoints[i].y) );
        }

        if( bIs3D )
        {
            for( i = 0; i < nPointCount; i++ )
            {
                CPL_SWAPDOUBLE( padfZ + i );
            }
        }
    }

    return OGRERR_NONE;
}

int OGRTABDataSource::Open( const char * pszName, int bTestOpen )

{
    VSIStatBuf  stat;

    CPLAssert( m_pszName == NULL );
    
    m_pszName = CPLStrdup( pszName );

/* -------------------------------------------------------------------- */
/*      Is this a file or directory?                                    */
/* -------------------------------------------------------------------- */
    if( VSIStat( pszName, &stat ) != 0 
        || (!VSI_ISDIR(stat.st_mode) && !VSI_ISREG(stat.st_mode)) )
    {
        if( !bTestOpen )
        {
            CPLError( CE_Failure, CPLE_OpenFailed,
                      "%s is not a file or directory.\n"
                      "Unable to open as a Mapinfo dataset.\n",
                      pszName );
        }

        return FALSE;
    }

/* -------------------------------------------------------------------- */
/*      If it is a file, try to open as a Mapinfo file.                 */
/* -------------------------------------------------------------------- */
    if( VSI_ISREG(stat.st_mode) )
    {
        IMapInfoFile    *poFile;

        poFile = IMapInfoFile::SmartOpen( pszName, bTestOpen );
        if( poFile == NULL )
            return FALSE;

        m_nLayerCount = 1;
        m_papoLayers = (IMapInfoFile **) CPLMalloc(sizeof(void*));
        m_papoLayers[0] = poFile;

        m_pszDirectory = CPLStrdup( CPLGetPath(pszName) );
    }

/* -------------------------------------------------------------------- */
/*      Otherwise, we need to scan the whole directory for files        */
/*      ending in .tab or .mif.                                         */
/* -------------------------------------------------------------------- */
    else
    {
        char    **papszFileList = CPLReadDir( pszName );
        
        m_pszDirectory = CPLStrdup( pszName );

        for( int iFile = 0;
             papszFileList != NULL && papszFileList[iFile] != NULL;
             iFile++ )
        {
            IMapInfoFile *poFile;
            const char  *pszExtension = CPLGetExtension(papszFileList[iFile]);
            char        *pszSubFilename;

            if( !EQUAL(pszExtension,"tab") && !EQUAL(pszExtension,"mif") )
                continue;

            pszSubFilename = CPLStrdup(
                CPLFormFilename( m_pszDirectory, papszFileList[iFile], NULL ));

            poFile = IMapInfoFile::SmartOpen( pszSubFilename, bTestOpen );
            CPLFree( pszSubFilename );
            
            if( poFile == NULL )
            {
                CSLDestroy( papszFileList );
                return FALSE;
            }

            m_nLayerCount++;
            m_papoLayers = (IMapInfoFile **)
                CPLRealloc(m_papoLayers,sizeof(void*)*m_nLayerCount);
            m_papoLayers[m_nLayerCount-1] = poFile;
        }

        CSLDestroy( papszFileList );

        if( m_nLayerCount == 0 )
        {
            if( !bTestOpen )
                CPLError( CE_Failure, CPLE_OpenFailed,
                          "No mapinfo files found in directory %s.\n",
                          m_pszDirectory );
            
            return FALSE;
        }
    }

    return TRUE;
}

void NASReader::SetFeaturePropertyDirectly( const char *pszElement,
                                            char *pszValue )

{
    GMLFeature *poFeature = GetState()->m_poFeature;

    CPLAssert( poFeature  != NULL );

/* -------------------------------------------------------------------- */
/*      Does this property exist in the feature class?  If not, add     */
/*      it.                                                             */
/* -------------------------------------------------------------------- */
    GMLFeatureClass *poClass = poFeature->GetClass();
    int      iProperty;

    for( iProperty=0; iProperty < poClass->GetPropertyCount(); iProperty++ )
    {
        if( EQUAL(poClass->GetProperty( iProperty )->GetSrcElement(),
                  pszElement ) )
            break;
    }
    
    if( iProperty == poClass->GetPropertyCount() )
    {
        if( poClass->IsSchemaLocked() )
        {
            CPLDebug("NAS","Encountered property missing from class schema.");
            CPLFree(pszValue);
            return;
        }

        CPLString osFieldName;
        
        if( strchr(pszElement,'|') == NULL )
            osFieldName = pszElement;
        else
        {
            osFieldName = strrchr(pszElement,'|') + 1;
            if( poClass->GetPropertyIndex(osFieldName) != -1 )
                osFieldName = pszElement;
        }

        // Does this conflict with an existing property name? 
        while( poClass->GetProperty(osFieldName) != NULL )
        {
            osFieldName += "_";
        }

        GMLPropertyDefn *poPDefn = new GMLPropertyDefn(osFieldName,pszElement);

        if( EQUAL(CPLGetConfigOption( "GML_FIELDTYPES", ""), "ALWAYS_STRING") )
            poPDefn->SetType( GMLPT_String );

        poClass->AddProperty( poPDefn );
    }

/* -------------------------------------------------------------------- */
/*      We want to handle <lage> specially to ensure it is zero         */
/*      filled, and treated as a string depspite the numeric            */
/*      content. https://trac.wheregroup.com/PostNAS/ticket/9           */
/* -------------------------------------------------------------------- */
    if( strcmp(poClass->GetProperty(iProperty)->GetName(),"lage") == 0 )
    {
        if( strlen(pszValue) < 5 )
        {
            CPLString osValue = "00000";
            osValue += pszValue;
            poFeature->SetPropertyDirectly( iProperty, CPLStrdup(osValue + osValue.size() - 5) );
            CPLFree(pszValue);
        }
        else
            poFeature->SetPropertyDirectly( iProperty, pszValue );

        
        if( !poClass->IsSchemaLocked() )
        {
            poClass->GetProperty(iProperty)->SetWidth( 5 );
            poClass->GetProperty(iProperty)->SetType( GMLPT_String );
        }
        return;
    }

/* -------------------------------------------------------------------- */
/*      Set the property                                                */
/* -------------------------------------------------------------------- */
    poFeature->SetPropertyDirectly( iProperty, pszValue );

/* -------------------------------------------------------------------- */
/*      Do we need to update the property type?                         */
/* -------------------------------------------------------------------- */
    if( !poClass->IsSchemaLocked() )
    {
        // Special handling for punktkennung per NAS #12
        if( strcmp(poClass->GetProperty(iProperty)->GetName(),
                   "punktkennung") == 0)
        {
            poClass->GetProperty(iProperty)->SetWidth( 15 );
            poClass->GetProperty(iProperty)->SetType( GMLPT_String );
        }
        // Special handling for artDerFlurstuecksgrenze per http://trac.osgeo.org/gdal/ticket/4255
//.........这里部分代码省略.........

//.........这里部分代码省略.........
       
    if( !FindFile( szTargetFile, pszDirectory, bReportErr, &fp ) )
        return FALSE;

/* -------------------------------------------------------------------- */
/*      Skip the line defining the column titles.                       */
/* -------------------------------------------------------------------- */
    pszLine = ReadLine( fp );

    if( !EQUAL(pszLine,
          "\"Code\",\"Attribute\",\"Acronym\",\"Attributetype\",\"Class\"") )
    {
        CPLError( CE_Failure, CPLE_AppDefined,
                  "s57attributes columns don't match expected format!\n" );
        return FALSE;
    }
    
/* -------------------------------------------------------------------- */
/*      Prepare arrays for the per-attribute information.               */
/* -------------------------------------------------------------------- */
    nAttrMax = MAX_ATTRIBUTES-1;
    papszAttrNames = (char **) CPLCalloc(sizeof(char *),MAX_ATTRIBUTES);
    papszAttrAcronym = (char **) CPLCalloc(sizeof(char *),MAX_ATTRIBUTES);
    //papapszAttrValues = (char ***) CPLCalloc(sizeof(char **),MAX_ATTRIBUTES);
    pachAttrType = (char *) CPLCalloc(sizeof(char),MAX_ATTRIBUTES);
    pachAttrClass = (char *) CPLCalloc(sizeof(char),MAX_ATTRIBUTES);
    panAttrIndex = (int *) CPLCalloc(sizeof(int),MAX_ATTRIBUTES);
    
/* -------------------------------------------------------------------- */
/*      Read and form string list.                                      */
/* -------------------------------------------------------------------- */
    int         iAttr;
    
    while( (pszLine = ReadLine(fp)) != NULL )
    {
        char    **papszTokens = CSLTokenizeStringComplex( pszLine, ",",
                                                          TRUE, TRUE );

        if( CSLCount(papszTokens) < 5 )
        {
            CPLAssert( FALSE );
            continue;
        }
        
        iAttr = atoi(papszTokens[0]);
        if( iAttr < 0 || iAttr >= nAttrMax
            || papszAttrNames[iAttr] != NULL )
        {
            CPLDebug( "S57", "Duplicate definition for attribute %d:%s", 
                      iAttr, papszTokens[2] );
            continue;
        }
        
        papszAttrNames[iAttr] = CPLStrdup(papszTokens[1]);
        papszAttrAcronym[iAttr] = CPLStrdup(papszTokens[2]);
        pachAttrType[iAttr] = papszTokens[3][0];
        pachAttrClass[iAttr] = papszTokens[4][0];

        CSLDestroy( papszTokens );
    }

    if( fp != NULL )
        VSIFClose( fp );
    
/* -------------------------------------------------------------------- */
/*      Build unsorted index of attributes.                             */
/* -------------------------------------------------------------------- */
    nAttrCount = 0;
    for( iAttr = 0; iAttr < nAttrMax; iAttr++ )
    {
        if( papszAttrAcronym[iAttr] != NULL )
            panAttrIndex[nAttrCount++] = iAttr;
    }

/* -------------------------------------------------------------------- */
/*      Sort index by acronym.                                          */
/* -------------------------------------------------------------------- */
    int         bModified;

    do
    {
        bModified = FALSE;
        for( iAttr = 0; iAttr < nAttrCount-1; iAttr++ )
        {
            if( strcmp(papszAttrAcronym[panAttrIndex[iAttr]],
                       papszAttrAcronym[panAttrIndex[iAttr+1]]) > 0 )
            {
                int     nTemp;

                nTemp = panAttrIndex[iAttr];
                panAttrIndex[iAttr] = panAttrIndex[iAttr+1];
                panAttrIndex[iAttr+1] = nTemp;

                bModified = TRUE;
            }
        }
    } while( bModified );
    
    return TRUE;
}

int OGRMySQLDataSource::FetchSRSId( OGRSpatialReference * poSRS )

{
    char           **papszRow;  
    MYSQL_RES       *hResult=NULL;
    
    char                szCommand[10000];
    char                *pszWKT = NULL;
    int                 nSRSId;

    if( poSRS == NULL )
        return -1;

/* -------------------------------------------------------------------- */
/*      Translate SRS to WKT.                                           */
/* -------------------------------------------------------------------- */
    if( poSRS->exportToWkt( &pszWKT ) != OGRERR_NONE )
        return -1;
    
    CPLAssert( strlen(pszWKT) < sizeof(szCommand) - 500 );

/* -------------------------------------------------------------------- */
/*      Try to find in the existing table.                              */
/* -------------------------------------------------------------------- */
    sprintf( szCommand, 
             "SELECT srid FROM spatial_ref_sys WHERE srtext = '%s'",
             pszWKT );

    if( !mysql_query( GetConn(), szCommand ) )
        hResult = mysql_store_result( GetConn() );

    if (!mysql_num_rows(hResult))
    {
        CPLDebug("MYSQL", "No rows exist currently exist in spatial_ref_sys");
        mysql_free_result( hResult );
        hResult = NULL;
    }
    papszRow = NULL;
    if( hResult != NULL )
        papszRow = mysql_fetch_row( hResult );
        
    if( papszRow != NULL && papszRow[0] != NULL )
    {
        nSRSId = atoi(papszRow[0]);
        if( hResult != NULL )
            mysql_free_result( hResult );
        hResult = NULL;
        CPLFree(pszWKT);
        return nSRSId;
    }

    // make sure to attempt to free results of successful queries
    hResult = mysql_store_result( GetConn() );
    if( hResult != NULL )
        mysql_free_result( hResult );
    hResult = NULL;

/* -------------------------------------------------------------------- */
/*      Get the current maximum srid in the srs table.                  */
/* -------------------------------------------------------------------- */
    sprintf( szCommand, 
             "SELECT MAX(srid) FROM spatial_ref_sys");    
    if( !mysql_query( GetConn(), szCommand ) )
    {
        hResult = mysql_store_result( GetConn() );
        papszRow = mysql_fetch_row( hResult );
    }
        
    if( papszRow != NULL && papszRow[0] != NULL )
    {
        nSRSId = atoi(papszRow[0]) + 1;
    }
    else
        nSRSId = 1;

    if( hResult != NULL )
        mysql_free_result( hResult );
    hResult = NULL;

/* -------------------------------------------------------------------- */
/*      Try adding the SRS to the SRS table.                            */
/* -------------------------------------------------------------------- */
    sprintf( szCommand, 
             "INSERT INTO spatial_ref_sys (srid,srtext) VALUES (%d,'%s')",
             nSRSId, pszWKT );

    if( !mysql_query( GetConn(), szCommand ) )
        hResult = mysql_store_result( GetConn() );

    // make sure to attempt to free results of successful queries
    hResult = mysql_store_result( GetConn() );
    if( hResult != NULL )
        mysql_free_result( hResult );
    hResult = NULL;

    CPLFree(pszWKT);

    return nSRSId;
}

//.........这里部分代码省略.........
        GDALRasterBand * poBaseMask = poBaseBand != nullptr ?
            poBaseBand->GetMaskBand() : nullptr;

        const int nOverviewCount = poBaseMask != nullptr ?
            poBaseMask->GetOverviewCount() : 0;

        GDALDataset* poMaskDSTemp = nullptr;
        for( int iOver = 0; iOver < nOverviewCount; iOver++ )
        {
            GDALRasterBand * const poOverBand =
                poBaseMask->GetOverview( iOver );
            if( poOverBand == nullptr )
                continue;

            if( poOverBand->GetXSize() == poDS->GetRasterXSize()
                && poOverBand->GetYSize() == poDS->GetRasterYSize() )
            {
                poMaskDSTemp = poOverBand->GetDataset();
                break;
            }
        }

        if( poMaskDSTemp != poDS )
        {
            poMaskDS = poMaskDSTemp;
            bCheckedForMask = true;
            bOwnMaskDS = false;

            return poMaskDS != nullptr;
        }
    }

/* -------------------------------------------------------------------- */
/*      Are we even initialized?  If not, we apparently don't want      */
/*      to support overviews and masks.                                 */
/* -------------------------------------------------------------------- */
    if( poDS == nullptr )
        return FALSE;

/* -------------------------------------------------------------------- */
/*      Check for .msk file.                                            */
/* -------------------------------------------------------------------- */
    bCheckedForMask = true;

    if( pszBasename == nullptr )
        pszBasename = poDS->GetDescription();

    // Don't bother checking for masks of masks.
    if( EQUAL(CPLGetExtension(pszBasename),"msk") )
        return FALSE;

    if( !GDALCanFileAcceptSidecarFile(pszBasename) )
        return FALSE;
    CPLString osMskFilename;
    osMskFilename.Printf( "%s.msk", pszBasename );

    std::vector<char> achMskFilename;
    achMskFilename.resize(osMskFilename.size() + 1);
    memcpy(&(achMskFilename[0]),
           osMskFilename.c_str(),
           osMskFilename.size() + 1);
    bool bExists = CPL_TO_BOOL(
        CPLCheckForFile( &achMskFilename[0],
                         papszSiblingFiles ) );
    osMskFilename = &achMskFilename[0];

#if !defined(WIN32)
    if( !bExists && !papszSiblingFiles )
    {
        osMskFilename.Printf( "%s.MSK", pszBasename );
        memcpy(&(achMskFilename[0]),
               osMskFilename.c_str(),
               osMskFilename.size() + 1);
        bExists = CPL_TO_BOOL(
            CPLCheckForFile( &achMskFilename[0],
                             papszSiblingFiles ) );
        osMskFilename = &achMskFilename[0];
    }
#endif

    if( !bExists )
        return FALSE;

/* -------------------------------------------------------------------- */
/*      Open the file.                                                  */
/* -------------------------------------------------------------------- */
    poMaskDS = GDALDataset::Open(
                    osMskFilename,
                    GDAL_OF_RASTER |
                    (poDS->GetAccess() == GA_Update ? GDAL_OF_UPDATE : 0),
                    nullptr, nullptr, papszInitSiblingFiles );
    CPLAssert( poMaskDS != poDS );

    if( poMaskDS == nullptr )
        return FALSE;

    bOwnMaskDS = true;

    return TRUE;
}

//.........这里部分代码省略.........

        for( int i = 0; i < nOverviews; i++ )
        {
            if( !abValidLevel[i] || !abRequireRefresh[i] )
                continue;

            for( int j = 0; j < poBand->GetOverviewCount(); j++ )
            {
                if( abAlreadyUsedOverviewBand[j] )
                    continue;

                GDALRasterBand * poOverview = poBand->GetOverview( j );
                if( poOverview == nullptr )
                    continue;

                int bHasNoData = FALSE;
                double noDataValue = poBand->GetNoDataValue(&bHasNoData);

                if( bHasNoData )
                  poOverview->SetNoDataValue(noDataValue);

                const int nOvFactor =
                    GDALComputeOvFactor(poOverview->GetXSize(),
                                        poBand->GetXSize(),
                                        poOverview->GetYSize(),
                                        poBand->GetYSize());

                if( nOvFactor == panOverviewList[i] ||
                    nOvFactor == GDALOvLevelAdjust2( panOverviewList[i],
                                                       poBand->GetXSize(),
                                                       poBand->GetYSize() ))
                {
                    abAlreadyUsedOverviewBand[j] = true;
                    CPLAssert(nNewOverviews < poBand->GetOverviewCount());
                    papoOverviewBands[nNewOverviews++] = poOverview;
                    break;
                }
            }
        }

        if( nNewOverviews > 0 )
        {
            const double dfOffset = dfAreaNewOverviews / dfAreaRefreshedOverviews;
            const double dfScale = 1.0 - dfOffset;
            pScaledProgress = GDALCreateScaledProgress(
                    dfOffset + dfScale * iBand / nBands,
                    dfOffset + dfScale * (iBand+1) / nBands,
                    pfnProgress, pProgressData );
            eErr = GDALRegenerateOverviews( GDALRasterBand::ToHandle(poBand),
                                            nNewOverviews,
                                            reinterpret_cast<GDALRasterBandH*>(papoOverviewBands),
                                            pszResampling,
                                            GDALScaledProgress, pScaledProgress );
            GDALDestroyScaledProgress( pScaledProgress );
        }
    }

/* -------------------------------------------------------------------- */
/*      Cleanup                                                         */
/* -------------------------------------------------------------------- */
    CPLFree( papoOverviewBands );
    CPLFree( panNewOverviewList );
    CPLFree( pahBands );

/* -------------------------------------------------------------------- */
/*      If we have a mask file, we need to build its overviews too.     */

void OGRCompoundCurve::EndPoint(OGRPoint *p) const
{
    CPLAssert(oCC.nCurveCount > 0);
    oCC.papoCurves[oCC.nCurveCount-1]->EndPoint(p);
}

//.........这里部分代码省略.........
                break;

            if (eReqDT == GDT_Int16)
            {
                WriteFloat(fp, 1); /* scale */
                WriteFloat(fp, 0); /* offset */
                for(k=0;k<nReqYSize;k++)
                {
                    int nLastVal = ((short*)pTileBuffer)[(nReqYSize - k - 1) * nReqXSize + 0];
                    GByte nWordSize = 1;
                    for(l=1;l<nReqXSize;l++)
                    {
                        int nVal = ((short*)pTileBuffer)[(nReqYSize - k - 1) * nReqXSize + l];
                        int nDiff = nVal - nLastVal;
                        if (nDiff < -32768 || nDiff > 32767)
                        {
                            nWordSize = 4;
                            break;
                        }
                        if (nDiff < -128 || nDiff > 127)
                            nWordSize = 2;
                        nLastVal = nVal;
                    }

                    VSIFWriteL(&nWordSize, 1, 1, fp);
                    nLastVal = ((short*)pTileBuffer)[(nReqYSize - k - 1) * nReqXSize + 0];
                    WriteInt(fp, nLastVal);
                    for(l=1;l<nReqXSize;l++)
                    {
                        int nVal = ((short*)pTileBuffer)[(nReqYSize - k - 1) * nReqXSize + l];
                        int nDiff = nVal - nLastVal;
                        if (nWordSize == 1)
                        {
                            CPLAssert(nDiff >= -128 && nDiff <= 127);
                            char chDiff = (char)nDiff;
                            VSIFWriteL(&chDiff, 1, 1, fp);
                        }
                        else if (nWordSize == 2)
                        {
                            CPLAssert(nDiff >= -32768 && nDiff <= 32767);
                            WriteShort(fp, (short)nDiff);
                        }
                        else
                        {
                            WriteInt(fp, nDiff);
                        }
                        nLastVal = nVal;
                    }
                }
            }
            else
            {
                float fMinVal = ((float*)pTileBuffer)[0];
                float fMaxVal = fMinVal;
                for(k=1;k<nReqYSize*nReqXSize;k++)
                {
                    float fVal = ((float*)pTileBuffer)[k];
                    if (fVal < fMinVal) fMinVal = fVal;
                    if (fVal > fMaxVal) fMaxVal = fVal;
                }

                float fIntRange = (fMaxVal - fMinVal) / fVertPres;
                float fScale = (fMinVal == fMaxVal) ? 1 : (fMaxVal - fMinVal) / fIntRange;
                float fOffset = fMinVal;
                WriteFloat(fp, fScale); /* scale */
                WriteFloat(fp, fOffset); /* offset */

int OGRMySQLDataSource::Open( const char * pszNewName, int bUpdate,
                              int bTestOpen )

{
    CPLAssert( nLayers == 0 );

/* -------------------------------------------------------------------- */
/*      Verify MySQL prefix.                                            */
/* -------------------------------------------------------------------- */
    if( !EQUALN(pszNewName,"MYSQL:",6) )
    {
        if( !bTestOpen )
            CPLError( CE_Failure, CPLE_AppDefined, 
                      "%s does not conform to MySQL naming convention,"
                      " MYSQL:dbname[, user=..][,password=..][,host=..][,port=..][tables=table;table;...]",
                      pszNewName );
        return FALSE;
    }
    
/* -------------------------------------------------------------------- */
/*      Use options process to get .my.cnf file contents.               */
/* -------------------------------------------------------------------- */
    int nPort = 0, i;
    char **papszTableNames=NULL;
    std::string oHost, oPassword, oUser, oDB;
    char *apszArgv[2] = { (char*) "org", NULL };
    char **papszArgv = apszArgv;
    int  nArgc = 1;
    const char *client_groups[] = {"client", "ogr", NULL };

    my_init(); // I hope there is no problem with calling this multiple times!
    load_defaults( "my", client_groups, &nArgc, &papszArgv );

    for( i = 0; i < nArgc; i++ )
    {
        if( EQUALN(papszArgv[i],"--user=",7) )
            oUser = papszArgv[i] + 7;
        else if( EQUALN(papszArgv[i],"--host=",7) )
            oHost = papszArgv[i] + 7;
        else if( EQUALN(papszArgv[i],"--password=",11) )
            oPassword = papszArgv[i] + 11;
        else if( EQUALN(papszArgv[i],"--port=",7) )
            nPort = atoi(papszArgv[i] + 7);
    }

    // cleanup
    free_defaults( papszArgv );

/* -------------------------------------------------------------------- */
/*      Parse out connection information.                               */
/* -------------------------------------------------------------------- */
    char **papszItems = CSLTokenizeString2( pszNewName+6, ",", 
                                            CSLT_HONOURSTRINGS );

    if( CSLCount(papszItems) < 1 )
    {
        CSLDestroy( papszItems );
        CPLError( CE_Failure, CPLE_AppDefined, 
                  "MYSQL: request missing databasename." );
        return FALSE;
    }

    oDB = papszItems[0];

    for( i = 1; papszItems[i] != NULL; i++ )
    {
        if( EQUALN(papszItems[i],"user=",5) )
            oUser = papszItems[i] + 5;
        else if( EQUALN(papszItems[i],"password=",9) )
            oPassword = papszItems[i] + 9;
        else if( EQUALN(papszItems[i],"host=",5) )
            oHost = papszItems[i] + 5;
        else if( EQUALN(papszItems[i],"port=",5) )
            nPort = atoi(papszItems[i] + 5);
        else if( EQUALN(papszItems[i],"tables=",7) )
        {
            papszTableNames = CSLTokenizeStringComplex( 
                papszItems[i] + 7, ";", FALSE, FALSE );
        }
        else
            CPLError( CE_Warning, CPLE_AppDefined, 
                      "'%s' in MYSQL datasource definition not recognised and ignored.", papszItems[i] );
    }

    CSLDestroy( papszItems );

/* -------------------------------------------------------------------- */
/*      Try to establish connection.                                    */
/* -------------------------------------------------------------------- */
    hConn = mysql_init( NULL );

    if( hConn == NULL )
    {
        CPLError( CE_Failure, CPLE_AppDefined,
                  "mysql_init() failed." );
    }

/* -------------------------------------------------------------------- */
/*      Set desired options on the connection: charset and timeout.     */
/* -------------------------------------------------------------------- */
//.........这里部分代码省略.........

static GDALDataset *
VRTCreateCopy( const char * pszFilename,
               GDALDataset *poSrcDS,
               int bStrict,
               char ** papszOptions,
               CPL_UNUSED GDALProgressFunc pfnProgress,
               CPL_UNUSED void * pProgressData )
{
    VRTDataset *poVRTDS = NULL;

    (void) bStrict;
    (void) papszOptions;

    CPLAssert( NULL != poSrcDS );

/* -------------------------------------------------------------------- */
/*      If the source dataset is a virtual dataset then just write      */
/*      it to disk as a special case to avoid extra layers of           */
/*      indirection.                                                    */
/* -------------------------------------------------------------------- */
    if( poSrcDS->GetDriver() != NULL &&
        EQUAL(poSrcDS->GetDriver()->GetDescription(),"VRT") )
    {

    /* -------------------------------------------------------------------- */
    /*      Convert tree to a single block of XML text.                     */
    /* -------------------------------------------------------------------- */
        char *pszVRTPath = CPLStrdup(CPLGetPath(pszFilename));
        ((VRTDataset *) poSrcDS)->UnsetPreservedRelativeFilenames();
        CPLXMLNode *psDSTree = ((VRTDataset *) poSrcDS)->SerializeToXML( pszVRTPath );

        char *pszXML = CPLSerializeXMLTree( psDSTree );
        
        CPLDestroyXMLNode( psDSTree );

        CPLFree( pszVRTPath );
        
    /* -------------------------------------------------------------------- */
    /*      Write to disk.                                                  */
    /* -------------------------------------------------------------------- */
        GDALDataset* pCopyDS = NULL;

        if( 0 != strlen( pszFilename ) )
        {
            VSILFILE *fpVRT = NULL;

            fpVRT = VSIFOpenL( pszFilename, "wb" );
            if (fpVRT == NULL)
            {
                CPLError(CE_Failure, CPLE_AppDefined,
                         "Cannot create %s", pszFilename);
                CPLFree( pszXML );
                return NULL;
            }

            VSIFWriteL( pszXML, 1, strlen(pszXML), fpVRT );
            VSIFCloseL( fpVRT );

            pCopyDS = (GDALDataset *) GDALOpen( pszFilename, GA_Update );
        }
        else
        {
            /* No destination file is given, so pass serialized XML directly. */

            pCopyDS = (GDALDataset *) GDALOpen( pszXML, GA_Update );
        }

        CPLFree( pszXML );

        return pCopyDS;
    }

/* -------------------------------------------------------------------- */
/*      Create the virtual dataset.                                     */
/* -------------------------------------------------------------------- */
    poVRTDS = (VRTDataset *) 
        VRTDataset::Create( pszFilename, 
                            poSrcDS->GetRasterXSize(),
                            poSrcDS->GetRasterYSize(),
                            0, GDT_Byte, NULL );
    if (poVRTDS == NULL)
        return NULL;

/* -------------------------------------------------------------------- */
/*      Do we have a geotransform?                                      */
/* -------------------------------------------------------------------- */
    double adfGeoTransform[6];

    if( poSrcDS->GetGeoTransform( adfGeoTransform ) == CE_None )
    {
        poVRTDS->SetGeoTransform( adfGeoTransform );
    }

/* -------------------------------------------------------------------- */
/*      Copy projection                                                 */
/* -------------------------------------------------------------------- */
    poVRTDS->SetProjection( poSrcDS->GetProjectionRef() );

/* -------------------------------------------------------------------- */
/*      Emit dataset level metadata.                                    */
//.........这里部分代码省略.........

CPLErr EpsilonRasterBand::IReadBlock( int nBlockXOff,
                                      int nBlockYOff, void * pImage)
{
    EpsilonDataset* poGDS = (EpsilonDataset*) poDS;
    
    //CPLDebug("EPSILON", "IReadBlock(nBand=%d,nBlockXOff=%d,nBlockYOff=%d)",
    //         nBand, nBlockXOff, nBlockYOff);

    int nBlocksPerRow = (poGDS->nRasterXSize + nBlockXSize - 1) / nBlockXSize;
    int nBlock = nBlockXOff + nBlockYOff * nBlocksPerRow;
    
    BlockDesc* psDesc = &poGDS->pasBlocks[nBlock];
#ifdef DEBUG
    int nBlocksPerColumn = (poGDS->nRasterYSize + nBlockYSize - 1) / nBlockYSize;
    CPLAssert(psDesc->x == nBlockXOff * nBlockXSize);
    CPLAssert(psDesc->y == nBlockYOff * nBlockYSize);
    CPLAssert(psDesc->w == (nBlockXOff < nBlocksPerRow - 1) ?
                                nBlockXSize : poGDS->nRasterXSize - psDesc->x);
    CPLAssert(psDesc->h == (nBlockYOff < nBlocksPerColumn - 1) ?
                                nBlockYSize : poGDS->nRasterYSize - psDesc->y);
#endif

    poGDS->Seek(psDesc->offset);
        
    if (!poGDS->GetNextBlockData())
    {
        memset(pImage, 0, nBlockXSize * nBlockYSize);
        return CE_Failure;
    }
    
    eps_block_header hdr;
    if (eps_read_block_header (poGDS->pabyBlockData,
                               poGDS->nBlockDataSize, &hdr) != EPS_OK)
    {
        CPLError(CE_Warning, CPLE_AppDefined, "cannot read block header");
        memset(pImage, 0, nBlockXSize * nBlockYSize);
        return CE_Failure;
    }

    if (hdr.chk_flag == EPS_BAD_CRC ||
        hdr.crc_flag == EPS_BAD_CRC)
    {
        CPLError(CE_Warning, CPLE_AppDefined, "bad CRC");
        memset(pImage, 0, nBlockXSize * nBlockYSize);
        return CE_Failure;
    }
    
    int w = (hdr.block_type == EPS_GRAYSCALE_BLOCK) ? hdr.gs.w : hdr.tc.w;
    int h = (hdr.block_type == EPS_GRAYSCALE_BLOCK) ? hdr.gs.h : hdr.tc.h;
    int i;

    if (poGDS->nBands == 1)
    {
        unsigned char ** pTempData =
            (unsigned char **) CPLMalloc(h * sizeof(unsigned char*));        
        for(i=0;i<h;i++)
            pTempData[i] = ((GByte*)pImage) + i * nBlockXSize;

        if (w != nBlockXSize || h != nBlockYSize)
            memset(pImage, 0, nBlockXSize * nBlockYSize);

        if (eps_decode_grayscale_block (pTempData,
                                        poGDS->pabyBlockData, &hdr) != EPS_OK)
        {
            CPLFree(pTempData);
            memset(pImage, 0, nBlockXSize * nBlockYSize);
            return CE_Failure;
        }
        CPLFree(pTempData);
    }
    else
    {
        if (poGDS->pabyRGBData == NULL)
        {
            poGDS->pabyRGBData =
                            (GByte*) VSIMalloc3(nBlock