C++ CPLDebug函数代码示例

int ILI1Reader::ReadTable(CPL_UNUSED const char *layername) {
    char **tokens = NULL;
    int ret = TRUE;
    int warned = FALSE;
    int geomIdx = -1;

    OGRFeatureDefn *featureDef = curLayer->GetLayerDefn();
    OGRFeature *feature = NULL;
    bool bFeatureAdded = false;

    while (ret && (tokens = ReadParseLine()) != NULL)
    {
      const char *firsttok = CSLGetField(tokens, 0);
      if (EQUAL(firsttok, "OBJE"))
      {
        if (featureDef->GetFieldCount() == 0)
        {
          CPLError( CE_Warning, CPLE_AppDefined,
                    "No field definition found for table: %s",
                    featureDef->GetName() );
          // Model not read - use heuristics.
          for( int fIndex=1; fIndex<CSLCount(tokens); fIndex++ )
          {
            char szFieldName[32];
            snprintf(szFieldName, sizeof(szFieldName), "Field%02d", fIndex);
            OGRFieldDefn oFieldDefn(szFieldName, OFTString);
            featureDef->AddFieldDefn(&oFieldDefn);
          }
        }
        //start new feature
        if( !bFeatureAdded )
            delete feature;
        feature = new OGRFeature(featureDef);

        for( int fIndex=1, fieldno = 0;
             fIndex<CSLCount(tokens) && fieldno < featureDef->GetFieldCount();
             fIndex++, fieldno++ )
        {
          if (!(tokens[fIndex][0] == codeUndefined && tokens[fIndex][1] == '\0')) {
#ifdef DEBUG_VERBOSE
            CPLDebug( "READ TABLE OGR_ILI", "Setting Field %d (Type %d): %s",
                      fieldno, featureDef->GetFieldDefn(fieldno)->GetType(),
                      tokens[fIndex] );
#endif
            if (featureDef->GetFieldDefn(fieldno)->GetType() == OFTString) {
                // Interlis 1 encoding is ISO 8859-1 (Latin1) -> Recode to UTF-8
                char* pszRecoded = CPLRecode(
                    tokens[fIndex], CPL_ENC_ISO8859_1, CPL_ENC_UTF8);
                // Replace space marks
                for( char* pszString = pszRecoded;
                     *pszString != '\0';
                     pszString++ ) {
                    if (*pszString == codeBlank) *pszString = ' ';
                }
                feature->SetField(fieldno, pszRecoded);
                CPLFree(pszRecoded);
            } else {
              feature->SetField(fieldno, tokens[fIndex]);
            }
            if (featureDef->GetFieldDefn(fieldno)->GetType() == OFTReal
                && fieldno > 0
                && featureDef->GetFieldDefn(fieldno-1)->GetType() == OFTReal) {
              // Check for Point geometry (Coord type).
              // If there is no ili model read,
              // we have no chance to detect the
              // geometry column.
              CPLString geomfldname
                  = featureDef->GetFieldDefn(fieldno)->GetNameRef();
              // Check if name ends with _1.
              if (geomfldname.size() >= 2 && geomfldname[geomfldname.size()-2]
                  == '_') {
                geomfldname = geomfldname.substr(0, geomfldname.size()-2);
                geomIdx = featureDef->GetGeomFieldIndex(geomfldname.c_str());
                if (geomIdx == -1)
                {
                  CPLError( CE_Warning, CPLE_AppDefined,
                            "No matching definition for field '%s' of "
                            "table %s found",
                            geomfldname.c_str(), featureDef->GetName() );
                }
              } else {
                geomIdx = -1;
              }
              if (geomIdx >= 0) {
                if (featureDef->GetGeomFieldDefn(geomIdx)->GetType() ==
                    wkbPoint) {
                  // Add Point geometry.
                  OGRPoint *ogrPoint = new OGRPoint(
                      CPLAtof(tokens[fIndex-1]), CPLAtof(tokens[fIndex]));
                  feature->SetGeomFieldDirectly(geomIdx, ogrPoint);
                } else if (featureDef->GetGeomFieldDefn(geomIdx)->GetType() ==
                           wkbPoint25D && fieldno > 1 &&
                           featureDef->GetFieldDefn(fieldno-2)->GetType() ==
                           OFTReal) {
                  // Add 3D Point geometry.
                  OGRPoint *ogrPoint = new OGRPoint(
                      CPLAtof(tokens[fIndex-2]), CPLAtof(tokens[fIndex-1]),
                      CPLAtof(tokens[fIndex]) );
                  feature->SetGeomFieldDirectly(geomIdx, ogrPoint);
                }
//.........这里部分代码省略.........

OGRErr OGRSpatialReference::exportToPanorama( long *piProjSys, long *piDatum,
                                              long *piEllips, long *piZone,
                                              double *padfPrjParams ) const

{
    CPLAssert( padfPrjParams );

    const char  *pszProjection = GetAttrValue("PROJECTION");

/* -------------------------------------------------------------------- */
/*      Fill all projection parameters with zero.                       */
/* -------------------------------------------------------------------- */
    int     i;

    *piDatum = 0L;
    *piEllips = 0L;
    *piZone = 0L;
    for ( i = 0; i < 7; i++ )
        padfPrjParams[i] = 0.0;

/* ==================================================================== */
/*      Handle the projection definition.                               */
/* ==================================================================== */
    if( IsLocal() )
        *piProjSys = PAN_PROJ_NONE;

    else if( pszProjection == NULL )
    {
#ifdef DEBUG
        CPLDebug( "OSR_Panorama",
                  "Empty projection definition, considered as Geographic" );
#endif
        *piProjSys = PAN_PROJ_NONE;
    }

    else if( EQUAL(pszProjection, SRS_PT_MERCATOR_1SP) )
    {
        *piProjSys = PAN_PROJ_MERCAT;
        padfPrjParams[3] =
            TO_RADIANS * GetNormProjParm( SRS_PP_CENTRAL_MERIDIAN, 0.0 );
        padfPrjParams[0] =
            TO_RADIANS * GetNormProjParm( SRS_PP_LATITUDE_OF_ORIGIN, 0.0 );
        padfPrjParams[4] = GetNormProjParm( SRS_PP_SCALE_FACTOR, 1.0 );
        padfPrjParams[5] = GetNormProjParm( SRS_PP_FALSE_EASTING, 0.0 );
        padfPrjParams[6] = GetNormProjParm( SRS_PP_FALSE_NORTHING, 0.0 );
    }

    else if( EQUAL(pszProjection, SRS_PT_POLAR_STEREOGRAPHIC) )
    {
        *piProjSys = PAN_PROJ_PS;
        padfPrjParams[3] =
            TO_RADIANS * GetNormProjParm( SRS_PP_CENTRAL_MERIDIAN, 0.0 );
        padfPrjParams[2] =
            TO_RADIANS * GetNormProjParm( SRS_PP_LATITUDE_OF_ORIGIN, 0.0 );
        padfPrjParams[4] = GetNormProjParm( SRS_PP_SCALE_FACTOR, 1.0 );
        padfPrjParams[5] = GetNormProjParm( SRS_PP_FALSE_EASTING, 0.0 );
        padfPrjParams[6] = GetNormProjParm( SRS_PP_FALSE_NORTHING, 0.0 );
    }

    else if( EQUAL(pszProjection, SRS_PT_POLYCONIC) )
    {
        *piProjSys = PAN_PROJ_POLYC;
        padfPrjParams[3] =
            TO_RADIANS * GetNormProjParm( SRS_PP_CENTRAL_MERIDIAN, 0.0 );
        padfPrjParams[2] =
            TO_RADIANS * GetNormProjParm( SRS_PP_LATITUDE_OF_ORIGIN, 0.0 );
        padfPrjParams[5] = GetNormProjParm( SRS_PP_FALSE_EASTING, 0.0 );
        padfPrjParams[6] = GetNormProjParm( SRS_PP_FALSE_NORTHING, 0.0 );
    }

    else if( EQUAL(pszProjection, SRS_PT_EQUIDISTANT_CONIC) )
    {
        *piProjSys = PAN_PROJ_EC;
        padfPrjParams[0] =
            TO_RADIANS * GetNormProjParm( SRS_PP_STANDARD_PARALLEL_1, 0.0 );
        padfPrjParams[1] =
            TO_RADIANS * GetNormProjParm( SRS_PP_STANDARD_PARALLEL_2, 0.0 );
        padfPrjParams[3] =
            TO_RADIANS * GetNormProjParm( SRS_PP_CENTRAL_MERIDIAN, 0.0 );
        padfPrjParams[2] =
            TO_RADIANS * GetNormProjParm( SRS_PP_LATITUDE_OF_ORIGIN, 0.0 );
        padfPrjParams[5] = GetNormProjParm( SRS_PP_FALSE_EASTING, 0.0 );
        padfPrjParams[6] = GetNormProjParm( SRS_PP_FALSE_NORTHING, 0.0 );
    }

    else if( EQUAL(pszProjection, SRS_PT_LAMBERT_CONFORMAL_CONIC_2SP) )
    {
        *piProjSys = PAN_PROJ_LCC;
        padfPrjParams[0] =
            TO_RADIANS * GetNormProjParm( SRS_PP_STANDARD_PARALLEL_1, 0.0 );
        padfPrjParams[1] =
            TO_RADIANS * GetNormProjParm( SRS_PP_STANDARD_PARALLEL_2, 0.0 );
        padfPrjParams[3] =
            TO_RADIANS * GetNormProjParm( SRS_PP_CENTRAL_MERIDIAN, 0.0 );
        padfPrjParams[2] =
            TO_RADIANS * GetNormProjParm( SRS_PP_LATITUDE_OF_ORIGIN, 0.0 );
        padfPrjParams[5] = GetNormProjParm( SRS_PP_FALSE_EASTING, 0.0 );
        padfPrjParams[6] = GetNormProjParm( SRS_PP_FALSE_NORTHING, 0.0 );
    }

//.........这里部分代码省略.........

static void 
RPCInverseTransformPoint( GDALRPCTransformInfo *psTransform,
                          double dfPixel, double dfLine, double dfHeight, 
                          double *pdfLong, double *pdfLat )

{
    double dfResultX, dfResultY;
    int    iIter;
    GDALRPCInfo *psRPC = &(psTransform->sRPC);

/* -------------------------------------------------------------------- */
/*      Compute an initial approximation based on linear                */
/*      interpolation from our reference point.                         */
/* -------------------------------------------------------------------- */
    dfResultX = psTransform->adfPLToLatLongGeoTransform[0]
        + psTransform->adfPLToLatLongGeoTransform[1] * dfPixel
        + psTransform->adfPLToLatLongGeoTransform[2] * dfLine;

    dfResultY = psTransform->adfPLToLatLongGeoTransform[3]
        + psTransform->adfPLToLatLongGeoTransform[4] * dfPixel
        + psTransform->adfPLToLatLongGeoTransform[5] * dfLine;

/* -------------------------------------------------------------------- */
/*      Now iterate, trying to find a closer LL location that will      */
/*      back transform to the indicated pixel and line.                 */
/* -------------------------------------------------------------------- */
    double dfPixelDeltaX=0.0, dfPixelDeltaY=0.0;

    for( iIter = 0; iIter < 10; iIter++ )
    {
        double dfBackPixel, dfBackLine;

        RPCTransformPoint( psRPC, dfResultX, dfResultY, dfHeight, 
                           &dfBackPixel, &dfBackLine );

        dfPixelDeltaX = dfBackPixel - dfPixel;
        dfPixelDeltaY = dfBackLine - dfLine;

        dfResultX = dfResultX 
            - dfPixelDeltaX * psTransform->adfPLToLatLongGeoTransform[1]
            - dfPixelDeltaY * psTransform->adfPLToLatLongGeoTransform[2];
        dfResultY = dfResultY 
            - dfPixelDeltaX * psTransform->adfPLToLatLongGeoTransform[4]
            - dfPixelDeltaY * psTransform->adfPLToLatLongGeoTransform[5];

        if( ABS(dfPixelDeltaX) < psTransform->dfPixErrThreshold
            && ABS(dfPixelDeltaY) < psTransform->dfPixErrThreshold )
        {
            iIter = -1;
            //CPLDebug( "RPC", "Converged!" );
            break;
        }

    }

    if( iIter != -1 )
        CPLDebug( "RPC", "Iterations %d: Got: %g,%g  Offset=%g,%g", 
                  iIter, 
                  dfResultX, dfResultY,
                  dfPixelDeltaX, dfPixelDeltaY );
    
    *pdfLong = dfResultX;
    *pdfLat = dfResultY;
}

CPLErr OGRMSSQLSpatialTableLayer::Initialize( const char *pszSchema,
                                              const char *pszLayerName, 
                                              const char *pszGeomCol,
                                              int nCoordDimension, 
                                              int nSRId,
                                              OGRwkbGeometryType eType )

{
    CPLODBCSession *poSession = poDS->GetSession();

    CPLFree( pszFIDColumn );
    pszFIDColumn = NULL;

/* -------------------------------------------------------------------- */
/*      Parse out schema name if present in layer.  We assume a         */
/*      schema is provided if there is a dot in the name, and that      */
/*      it is in the form <schema>.<tablename>                          */
/* -------------------------------------------------------------------- */
    const char *pszDot = strstr(pszLayerName,".");
    if( pszDot != NULL )
    {
        pszTableName = CPLStrdup(pszDot + 1);
        pszSchemaName = CPLStrdup(pszLayerName);
        pszSchemaName[pszDot - pszLayerName] = '\0';
    }
    else
    {
        pszTableName = CPLStrdup(pszLayerName);
        pszSchemaName = CPLStrdup(pszSchema);
    }

/* -------------------------------------------------------------------- */
/*      Do we have a simple primary key?                                */
/* -------------------------------------------------------------------- */
    CPLODBCStatement oGetKey( poSession );
    
    if( oGetKey.GetPrimaryKeys( pszTableName, poDS->GetCatalog(), pszSchemaName ) 
        && oGetKey.Fetch() )
    {
        pszFIDColumn = CPLStrdup(oGetKey.GetColData( 3 ));
        
        if( oGetKey.Fetch() ) // more than one field in key! 
        {
            CPLFree( pszFIDColumn );
            pszFIDColumn = NULL;

            CPLDebug( "OGR_MSSQLSpatial", "Table %s has multiple primary key fields, "
                      "ignoring them all.", pszTableName );
        }
    }

/* -------------------------------------------------------------------- */
/*      Have we been provided a geometry column?                        */
/* -------------------------------------------------------------------- */
    CPLFree( pszGeomColumn );
    if( pszGeomCol == NULL )
        pszGeomColumn = NULL;
    else
        pszGeomColumn = CPLStrdup( pszGeomCol );

/* -------------------------------------------------------------------- */
/*      Get the column definitions for this table.                      */
/* -------------------------------------------------------------------- */
    CPLODBCStatement oGetCol( poSession );
    CPLErr eErr;

    if( !oGetCol.GetColumns( pszTableName, poDS->GetCatalog(), pszSchemaName ) )
        return CE_Failure;

    eErr = BuildFeatureDefn( pszLayerName, &oGetCol );
    if( eErr != CE_None )
        return eErr;
        
    poFeatureDefn->SetGeomType(eType);

    if( poFeatureDefn->GetFieldCount() == 0 &&
        pszFIDColumn == NULL && pszGeomColumn == NULL )
    {
        CPLError( CE_Failure, CPLE_AppDefined, 
                  "No column definitions found for table '%s', layer not usable.", 
                  pszLayerName );
        return CE_Failure;
    }
        
/* -------------------------------------------------------------------- */
/*      If we got a geometry column, does it exist?  Is it binary?      */
/* -------------------------------------------------------------------- */
    if( pszGeomColumn != NULL )
    {
        int iColumn = oGetCol.GetColId( pszGeomColumn );
        if( iColumn < 0 )
        {
            CPLError( CE_Failure, CPLE_AppDefined, 
                      "Column %s requested for geometry, but it does not exist.", 
                      pszGeomColumn );
            CPLFree( pszGeomColumn );
            pszGeomColumn = NULL;
        }
        else
        {
//.........这里部分代码省略.........

GvData *gv_shapes_from_ogr_layer(void *ogr_layer)
{
    CPLDebug( "OpenEV", "gv_shapes_from_ogr_layer() called, "
              "but OGR not configured" );
    return NULL;
}

size_t VSICurlStreamingHandle::Read( void *pBuffer, size_t nSize, size_t nMemb )
{
    GByte* pabyBuffer = (GByte*)pBuffer;
    size_t nBufferRequestSize = nSize * nMemb;
    if (nBufferRequestSize == 0)
        return 0;
    size_t nRemaining = nBufferRequestSize;

    AcquireMutex();
    int bHastComputedFileSizeLocal = bHastComputedFileSize;
    vsi_l_offset fileSizeLocal = fileSize;
    ReleaseMutex();

    if (bHastComputedFileSizeLocal && curOffset >= fileSizeLocal)
    {
        CPLDebug("VSICURL", "Read attempt beyond end of file");
        bEOF = TRUE;
    }
    if (bEOF)
        return 0;

    if (curOffset < nRingBufferFileOffset)
        PutRingBufferInCache();

    if (ENABLE_DEBUG)
        CPLDebug("VSICURL", "Read [" CPL_FRMT_GUIB ", " CPL_FRMT_GUIB "[ in %s",
                 curOffset, curOffset + nBufferRequestSize, pszURL);

#ifdef notdef
    if( pCachedData != NULL && nCachedSize >= 1024 &&
        nRecomputedChecksumOfFirst1024Bytes == 0 )
    {
        for(size_t i = 0; i < 1024 / sizeof(int); i ++)
        {
            int nVal;
            memcpy(&nVal, pCachedData + i * sizeof(int), sizeof(int));
            nRecomputedChecksumOfFirst1024Bytes += nVal;
        }

        if( bHastComputedFileSizeLocal )
        {
            poFS->AcquireMutex();
            CachedFileProp* cachedFileProp = poFS->GetCachedFileProp(pszURL);
            if( cachedFileProp->nChecksumOfFirst1024Bytes == 0 )
            {
                cachedFileProp->nChecksumOfFirst1024Bytes = nRecomputedChecksumOfFirst1024Bytes;
            }
            else if( nRecomputedChecksumOfFirst1024Bytes != cachedFileProp->nChecksumOfFirst1024Bytes )
            {
                CPLDebug("VSICURL", "Invalidating previously cached file size. First bytes of file have changed!");
                AcquireMutex();
                bHastComputedFileSize = FALSE;
                cachedFileProp->bHastComputedFileSize = FALSE;
                cachedFileProp->nChecksumOfFirst1024Bytes = 0;
                ReleaseMutex();
            }
            poFS->ReleaseMutex();
        }
    }
#endif

    /* Can we use the cache ? */
    if( pCachedData != NULL && curOffset < nCachedSize )
    {
        size_t nSz = MIN(nRemaining, (size_t)(nCachedSize - curOffset));
        if (ENABLE_DEBUG)
            CPLDebug("VSICURL", "Using cache for [%d, %d[ in %s",
                     (int)curOffset, (int)(curOffset + nSz), pszURL);
        memcpy(pabyBuffer, pCachedData + curOffset, nSz);
        pabyBuffer += nSz;
        curOffset += nSz;
        nRemaining -= nSz;
    }

    /* Is the request partially covered by the cache and going beyond file size ? */
    if ( pCachedData != NULL && bHastComputedFileSizeLocal &&
         curOffset <= nCachedSize &&
         curOffset + nRemaining > fileSizeLocal &&
         fileSize == nCachedSize )
    {
        size_t nSz = (size_t) (nCachedSize - curOffset);
        if (ENABLE_DEBUG && nSz != 0)
            CPLDebug("VSICURL", "Using cache for [%d, %d[ in %s",
                    (int)curOffset, (int)(curOffset + nSz), pszURL);
        memcpy(pabyBuffer, pCachedData + curOffset, nSz);
        pabyBuffer += nSz;
        curOffset += nSz;
        nRemaining -= nSz;
        bEOF = TRUE;
    }

    /* Has a Seek() being done since the last Read() ? */
    if (!bEOF && nRemaining > 0 && curOffset != nRingBufferFileOffset)
    {
        /* Backward seek : we need to restart the download from the start */
        if (curOffset < nRingBufferFileOffset)
            StopDownload();

        StartDownload();

//.........这里部分代码省略.........

int VSICurlStreamingHandle::ReceivedBytes(GByte *buffer, size_t count, size_t nmemb)
{
    size_t nSize = count * nmemb;
    nBodySize += nSize;

    if (ENABLE_DEBUG)
        CPLDebug("VSICURL", "Receiving %d bytes...", (int)nSize);

    if( bHasCandidateFileSize && bCanTrustCandidateFileSize && !bHastComputedFileSize )
    {
        poFS->AcquireMutex();
        CachedFileProp* cachedFileProp = poFS->GetCachedFileProp(pszURL);
        cachedFileProp->fileSize = fileSize = nCandidateFileSize;
        cachedFileProp->bHastComputedFileSize = bHastComputedFileSize = TRUE;
        if (ENABLE_DEBUG)
            CPLDebug("VSICURL", "File size = " CPL_FRMT_GUIB, fileSize);
        poFS->ReleaseMutex();
    }

    AcquireMutex();
    if (eExists == EXIST_UNKNOWN)
    {
        poFS->AcquireMutex();
        CachedFileProp* cachedFileProp = poFS->GetCachedFileProp(pszURL);
        cachedFileProp->eExists = eExists = EXIST_YES;
        poFS->ReleaseMutex();
    }
    else if (eExists == EXIST_NO)
    {
        ReleaseMutex();
        return 0;
    }

    while(TRUE)
    {
        size_t nFree = oRingBuffer.GetCapacity() - oRingBuffer.GetSize();
        if (nSize <= nFree)
        {
            oRingBuffer.Write(buffer, nSize);

            /* Signal to the consumer that we have added bytes to the buffer */
            CPLCondSignal(hCondProducer);

            if (bAskDownloadEnd)
            {
                if (ENABLE_DEBUG)
                    CPLDebug("VSICURL", "Download interruption asked");

                ReleaseMutex();
                return 0;
            }
            break;
        }
        else
        {
            oRingBuffer.Write(buffer, nFree);
            buffer += nFree;
            nSize -= nFree;

            /* Signal to the consumer that we have added bytes to the buffer */
            CPLCondSignal(hCondProducer);

            if (ENABLE_DEBUG)
                CPLDebug("VSICURL", "Waiting for reader to consume some bytes...");

            while(oRingBuffer.GetSize() == oRingBuffer.GetCapacity() && !bAskDownloadEnd)
            {
                CPLCondWait(hCondConsumer, hRingBufferMutex);
            }

            if (bAskDownloadEnd)
            {
                if (ENABLE_DEBUG)
                    CPLDebug("VSICURL", "Download interruption asked");

                ReleaseMutex();
                return 0;
            }
        }
    }

    ReleaseMutex();

    return nmemb;
}

//.........这里部分代码省略.........
    /***********   Grab SEMI-MAJOR ************/
    semi_major = 
        atof(poDS->GetKeyword( "QUBE.IMAGE_MAP_PROJECTION.A_AXIS_RADIUS")) * 1000.0;

    /***********   Grab semi-minor ************/
    semi_minor = 
        atof(poDS->GetKeyword( "QUBE.IMAGE_MAP_PROJECTION.C_AXIS_RADIUS")) * 1000.0;

    /***********   Grab CENTER_LAT ************/
    center_lat = 
        atof(poDS->GetKeyword( "QUBE.IMAGE_MAP_PROJECTION.CENTER_LATITUDE"));

    /***********   Grab CENTER_LON ************/
    center_lon = 
        atof(poDS->GetKeyword( "QUBE.IMAGE_MAP_PROJECTION.CENTER_LONGITUDE"));

    /***********   Grab 1st std parallel ************/
    first_std_parallel = 
        atof(poDS->GetKeyword( "QUBE.IMAGE_MAP_PROJECTION.FIRST_STANDARD_PARALLEL"));

    /***********   Grab 2nd std parallel ************/
    second_std_parallel = 
        atof(poDS->GetKeyword( "QUBE.IMAGE_MAP_PROJECTION.SECOND_STANDARD_PARALLEL"));
     
    /*** grab  PROJECTION_LATITUDE_TYPE = "PLANETOCENTRIC" ****/
    // Need to further study how ocentric/ographic will effect the gdal library.
    // So far we will use this fact to define a sphere or ellipse for some projections
    // Frank - may need to talk this over
    char bIsGeographic = TRUE;
    value = poDS->GetKeyword("CUBE.IMAGE_MAP_PROJECTION.PROJECTION_LATITUDE_TYPE");
    if (EQUAL( value, "\"PLANETOCENTRIC\"" ))
        bIsGeographic = FALSE; 
     
    CPLDebug("ISIS2","using projection %s", map_proj_name.c_str() );

    //Set oSRS projection and parameters
    if ((EQUAL( map_proj_name, "EQUIRECTANGULAR_CYLINDRICAL" )) ||
        (EQUAL( map_proj_name, "EQUIRECTANGULAR" )) ||
        (EQUAL( map_proj_name, "SIMPLE_CYLINDRICAL" )) ) {
        oSRS.OGRSpatialReference::SetEquirectangular2 ( 0.0, center_lon, center_lat, 0, 0 );
    } else if (EQUAL( map_proj_name, "ORTHOGRAPHIC" )) { 
        oSRS.OGRSpatialReference::SetOrthographic ( center_lat, center_lon, 0, 0 );
    } else if ((EQUAL( map_proj_name, "SINUSOIDAL" )) ||
               (EQUAL( map_proj_name, "SINUSOIDAL_EQUAL-AREA" ))) {
        oSRS.OGRSpatialReference::SetSinusoidal ( center_lon, 0, 0 );
    } else if (EQUAL( map_proj_name, "MERCATOR" )) {
        oSRS.OGRSpatialReference::SetMercator ( center_lat, center_lon, 1, 0, 0 );
    } else if (EQUAL( map_proj_name, "POLAR_STEREOGRAPHIC" )) {
        oSRS.OGRSpatialReference::SetPS ( center_lat, center_lon, 1, 0, 0 );
    } else if (EQUAL( map_proj_name, "TRANSVERSE_MERCATOR" )) {
        oSRS.OGRSpatialReference::SetTM ( center_lat, center_lon, 1, 0, 0 );
    } else if (EQUAL( map_proj_name, "LAMBERT_CONFORMAL_CONIC" )) {
        oSRS.OGRSpatialReference::SetLCC ( first_std_parallel, second_std_parallel, center_lat, center_lon, 0, 0 );
    } else {
        CPLDebug( "ISIS2",
                  "Dataset projection %s is not supported. Continuing...",
                  map_proj_name.c_str() );
        bProjectionSet = FALSE;
    }

    if (bProjectionSet) {
        //Create projection name, i.e. MERCATOR MARS and set as ProjCS keyword
        CPLString proj_target_name = map_proj_name + " " + target_name;
        oSRS.SetProjCS(proj_target_name); //set ProjCS keyword
     
        //The geographic/geocentric name will be the same basic name as the body name

int OGRSVGDataSource::Open( const char * pszFilename )

{
#ifdef HAVE_EXPAT
    pszName = CPLStrdup( pszFilename );

/* -------------------------------------------------------------------- */
/*      Try to open the file.                                           */
/* -------------------------------------------------------------------- */
    CPLString osFilename(pszFilename);
    if (EQUAL(CPLGetExtension(pszFilename), "svgz") &&
        strstr(pszFilename, "/vsigzip/") == NULL)
    {
        osFilename = CPLString("/vsigzip/") + pszFilename;
        pszFilename = osFilename.c_str();
    }

    VSILFILE* fp = VSIFOpenL(pszFilename, "r");
    if (fp == NULL)
        return FALSE;
    
    eValidity = SVG_VALIDITY_UNKNOWN;

    XML_Parser oParser = OGRCreateExpatXMLParser();
    oCurrentParser = oParser;
    XML_SetUserData(oParser, this);
    XML_SetElementHandler(oParser, ::startElementValidateCbk, NULL);
    XML_SetCharacterDataHandler(oParser, ::dataHandlerValidateCbk);
    
    char aBuf[BUFSIZ];
    int nDone;
    unsigned int nLen;
    int nCount = 0;
    
    /* Begin to parse the file and look for the <svg> element */
    /* It *MUST* be the first element of an XML file */
    /* So once we have read the first element, we know if we can */
    /* handle the file or not with that driver */
    do
    {
        nDataHandlerCounter = 0;
        nLen = (unsigned int) VSIFReadL( aBuf, 1, sizeof(aBuf), fp );
        nDone = VSIFEofL(fp);
        if (XML_Parse(oParser, aBuf, nLen, nDone) == XML_STATUS_ERROR)
        {
            if (nLen <= BUFSIZ-1)
                aBuf[nLen] = 0;
            else
                aBuf[BUFSIZ-1] = 0;
            if (strstr(aBuf, "<?xml") && strstr(aBuf, "<svg"))
            {
                CPLError(CE_Failure, CPLE_AppDefined,
                        "XML parsing of SVG file failed : %s at line %d, column %d",
                        XML_ErrorString(XML_GetErrorCode(oParser)),
                        (int)XML_GetCurrentLineNumber(oParser),
                        (int)XML_GetCurrentColumnNumber(oParser));
            }
            eValidity = SVG_VALIDITY_INVALID;
            break;
        }
        if (eValidity == SVG_VALIDITY_INVALID)
        {
            break;
        }
        else if (eValidity == SVG_VALIDITY_VALID)
        {
            break;
        }
        else
        {
            /* After reading 50 * BUFSIZE bytes, and not finding whether the file */
            /* is SVG or not, we give up and fail silently */
            nCount ++;
            if (nCount == 50)
                break;
        }
    } while (!nDone && nLen > 0 );

    XML_ParserFree(oParser);

    VSIFCloseL(fp);

    if (eValidity == SVG_VALIDITY_VALID)
    {
        if (bIsCloudmade)
        {
            nLayers = 3;
            papoLayers =(OGRSVGLayer **) CPLRealloc(papoLayers,
                                            nLayers * sizeof(OGRSVGLayer*));
            papoLayers[0] = new OGRSVGLayer( pszFilename, "points", SVG_POINTS, this );
            papoLayers[1] = new OGRSVGLayer( pszFilename, "lines", SVG_LINES, this );
            papoLayers[2] = new OGRSVGLayer( pszFilename, "polygons", SVG_POLYGONS, this );
        }
        else
        {
            CPLDebug("SVG",
                     "%s seems to be a SVG file, but not a Cloudmade vector one.",
                     pszFilename);
        }
    }
//.........这里部分代码省略.........

//.........这里部分代码省略.........
            double dfEndAngle;
            double dfRotation;
            double dfRatio;
            int    bCounterClockwise = FALSE;

            if( poDS->ReadValue(szLineBuf,sizeof(szLineBuf)) == 10 )
                dfCenterX = atof(szLineBuf);
            else
                break;

            if( poDS->ReadValue(szLineBuf,sizeof(szLineBuf)) == 20 )
                dfCenterY = atof(szLineBuf);
            else
                break;

            if( poDS->ReadValue(szLineBuf,sizeof(szLineBuf)) == 11 )
                dfMajorX = atof(szLineBuf);
            else
                break;

            if( poDS->ReadValue(szLineBuf,sizeof(szLineBuf)) == 21 )
                dfMajorY = atof(szLineBuf);
            else
                break;

            if( poDS->ReadValue(szLineBuf,sizeof(szLineBuf)) == 40 )
                dfRatio = atof(szLineBuf) / 100.0;
            else
                break;

            if( poDS->ReadValue(szLineBuf,sizeof(szLineBuf)) == 50 )
                dfStartAngle = -1 * atof(szLineBuf);
            else
                break;

            if( poDS->ReadValue(szLineBuf,sizeof(szLineBuf)) == 51 )
                dfEndAngle = -1 * atof(szLineBuf);
            else
                break;

            if( (nCode = poDS->ReadValue(szLineBuf,sizeof(szLineBuf))) == 73 )
                bCounterClockwise = atoi(szLineBuf);
            else if (nCode >= 0)
                poDS->UnreadValue();

            if( bCounterClockwise )
            {
                double dfTemp = dfStartAngle;
                dfStartAngle = dfEndAngle;
                dfEndAngle = dfTemp;
            }

            if( dfStartAngle > dfEndAngle )
                dfEndAngle += 360.0;

            dfMajorRadius = sqrt( dfMajorX * dfMajorX + dfMajorY * dfMajorY );
            dfMinorRadius = dfMajorRadius * dfRatio;

            dfRotation = -1 * atan2( dfMajorY, dfMajorX ) * 180 / PI;

            OGRGeometry *poArc = OGRGeometryFactory::approximateArcAngles( 
                dfCenterX, dfCenterY, 0.0,
                dfMajorRadius, dfMinorRadius, dfRotation,
                dfStartAngle, dfEndAngle, 0.0 );

            poArc->flattenTo2D();

            poGC->addGeometryDirectly( poArc );
        }
        else
        {
            CPLDebug( "DXF", "Unsupported HATCH boundary line type:%d",
                      nEdgeType );
            return OGRERR_UNSUPPORTED_OPERATION;
        }
    }

/* -------------------------------------------------------------------- */
/*      Skip through source boundary objects if present.                */
/* -------------------------------------------------------------------- */
    nCode = poDS->ReadValue(szLineBuf,sizeof(szLineBuf));
    if( nCode != 97 )
    {
        if (nCode < 0)
            return OGRERR_FAILURE;
        poDS->UnreadValue();
    }
    else
    {
        int iObj, nObjCount = atoi(szLineBuf);

        for( iObj = 0; iObj < nObjCount; iObj++ )
        {
            if (poDS->ReadValue( szLineBuf, sizeof(szLineBuf) ) < 0)
                return OGRERR_FAILURE;
        }
    }

    return OGRERR_NONE;
}

static GDALDataset *OGRSEGYDriverOpen( GDALOpenInfo* poOpenInfo )
{
    if( poOpenInfo->eAccess == GA_Update ||
        poOpenInfo->fpL == NULL ||
        !poOpenInfo->TryToIngest(3200+400) ||
        poOpenInfo->nHeaderBytes < 3200+400 )
    {
        return NULL;
    }
    if( STARTS_WITH_CI((const char*)poOpenInfo->pabyHeader, "%PDF"))
    {
        return NULL;
    }

// --------------------------------------------------------------------
//      Try to decode the header encoded as EBCDIC and then ASCII
// --------------------------------------------------------------------

    int i, j, k;
    const GByte* pabyTextHeader = poOpenInfo->pabyHeader;
    GByte* pabyASCIITextHeader = (GByte*) CPLMalloc(3200 + 40 + 1);
    for( k=0; k<2; k++)
    {
        for( i=0, j=0;i<3200;i++)
        {
            GByte chASCII = (k == 0) ? EBCDICToASCII[pabyTextHeader[i]] :
                                       pabyTextHeader[i];
            if (chASCII < 32 && chASCII != '\t' &&
                chASCII != '\n' && chASCII != '\r')
            {
                break;
            }
            pabyASCIITextHeader[j++] = chASCII;
            if (chASCII != '\n' && ((i + 1) % 80) == 0)
                pabyASCIITextHeader[j++] = '\n';
        }
        pabyASCIITextHeader[j] = '\0';

        if (i == 3200)
            break;
        if (k == 1)
        {
            CPLFree(pabyASCIITextHeader);
            return NULL;
        }
    }

    CPLDebug("SIGY", "Header = \n%s", pabyASCIITextHeader);
    CPLFree(pabyASCIITextHeader);
    pabyASCIITextHeader = NULL;

// --------------------------------------------------------------------
//      Read the next 400 bytes, where the Binary File Header is
//      located
// --------------------------------------------------------------------

    const GByte* abyFileHeader = poOpenInfo->pabyHeader + 3200;

// --------------------------------------------------------------------
//      First check that this binary header is not EBCDIC nor ASCII
// --------------------------------------------------------------------
    for( k=0;k<2;k++ )
    {
        for( i=0;i<400;i++)
        {
            GByte chASCII = (k == 0) ? abyFileHeader[i] :
                                       EBCDICToASCII[abyFileHeader[i]];
            /* A translated 0 value, when source value is not 0, means an invalid */
            /* EBCDIC value. Bail out also for control characters */
            if (chASCII < 32 && chASCII != '\t' &&
                chASCII != '\n' && chASCII != '\r')
            {
                break;
            }
        }
        if (i == 400)
        {
            CPLFree(pabyASCIITextHeader);
            return NULL;
        }
    }

    OGRSEGYDataSource   *poDS = new OGRSEGYDataSource();

    if( !poDS->Open( poOpenInfo->pszFilename, (const char*)pabyASCIITextHeader ) )
    {
        CPLFree(pabyASCIITextHeader);
        delete poDS;
        poDS = NULL;
    }

    CPLFree(pabyASCIITextHeader);
    return poDS;
}

json_object* OGRCARTODBDataSource::RunSQL(const char* pszUnescapedSQL)
{
    CPLString osSQL("POSTFIELDS=q=");
    /* Do post escaping */
    for(int i=0;pszUnescapedSQL[i] != 0;i++)
    {
        const int ch = ((unsigned char*)pszUnescapedSQL)[i];
        if (ch != '&' && ch >= 32 && ch < 128)
            osSQL += (char)ch;
        else
            osSQL += CPLSPrintf("%%%02X", ch);
    }

/* -------------------------------------------------------------------- */
/*      Provide the API Key                                             */
/* -------------------------------------------------------------------- */
    if( osAPIKey.size() )
    {
        osSQL += "&api_key=";
        osSQL += osAPIKey;
    }

/* -------------------------------------------------------------------- */
/*      Collection the header options and execute request.              */
/* -------------------------------------------------------------------- */
    const char* pszAPIURL = GetAPIURL();
    char** papszOptions = CSLAddString(
        strncmp(pszAPIURL, "/vsimem/", strlen("/vsimem/")) != 0 ? AddHTTPOptions(): NULL, osSQL);
    CPLHTTPResult * psResult = CPLHTTPFetch( GetAPIURL(), papszOptions);
    CSLDestroy(papszOptions);

/* -------------------------------------------------------------------- */
/*      Check for some error conditions and report.  HTML Messages      */
/*      are transformed info failure.                                   */
/* -------------------------------------------------------------------- */
    if (psResult && psResult->pszContentType &&
        strncmp(psResult->pszContentType, "text/html", 9) == 0)
    {
        CPLDebug( "CARTODB", "RunSQL HTML Response:%s", psResult->pabyData );
        CPLError(CE_Failure, CPLE_AppDefined, 
                 "HTML error page returned by server");
        CPLHTTPDestroyResult(psResult);
        return NULL;
    }
    if (psResult && psResult->pszErrBuf != NULL) 
    {
        CPLDebug( "CARTODB", "RunSQL Error Message:%s", psResult->pszErrBuf );
    }
    else if (psResult && psResult->nStatus != 0) 
    {
        CPLDebug( "CARTODB", "RunSQL Error Status:%d", psResult->nStatus );
    }

    if( psResult->pabyData == NULL )
    {
        CPLHTTPDestroyResult(psResult);
        return NULL;
    }
    
    if( strlen((const char*)psResult->pabyData) < 1000 )
        CPLDebug( "CARTODB", "RunSQL Response:%s", psResult->pabyData );
    
    json_tokener* jstok = NULL;
    json_object* poObj = NULL;

    jstok = json_tokener_new();
    poObj = json_tokener_parse_ex(jstok, (const char*) psResult->pabyData, -1);
    if( jstok->err != json_tokener_success)
    {
        CPLError( CE_Failure, CPLE_AppDefined,
                    "JSON parsing error: %s (at offset %d)",
                    json_tokener_error_desc(jstok->err), jstok->char_offset);
        json_tokener_free(jstok);
        CPLHTTPDestroyResult(psResult);
        return NULL;
    }
    json_tokener_free(jstok);

    CPLHTTPDestroyResult(psResult);

    if( poObj != NULL )
    {
        if( json_object_get_type(poObj) == json_type_object )
        {
            json_object* poError = json_object_object_get(poObj, "error");
            if( poError != NULL && json_object_get_type(poError) == json_type_array &&
                json_object_array_length(poError) > 0 )
            {
                poError = json_object_array_get_idx(poError, 0);
                if( poError != NULL && json_object_get_type(poError) == json_type_string )
                {
                    CPLError(CE_Failure, CPLE_AppDefined, 
                            "Error returned by server : %s", json_object_get_string(poError));
                    json_object_put(poObj);
                    return NULL;
                }
            }
        }
        else
        {
//.........这里部分代码省略.........

OGRBoolean OGRLinearRing::isPointInRing(const OGRPoint* poPoint, int bTestEnvelope) const
{
    if ( NULL == poPoint )
    {
        CPLDebug( "OGR", "OGRLinearRing::isPointInRing(const  OGRPoint* poPoint) - passed point is NULL!" );
        return 0;
    }

    const int iNumPoints = getNumPoints();

    // Simple validation
    if ( iNumPoints < 4 )
        return 0;

    const double dfTestX = poPoint->getX();
    const double dfTestY = poPoint->getY();

    // Fast test if point is inside extent of the ring
    if (bTestEnvelope)
    {
        OGREnvelope extent;
        getEnvelope(&extent);
        if ( !( dfTestX >= extent.MinX && dfTestX <= extent.MaxX
            && dfTestY >= extent.MinY && dfTestY <= extent.MaxY ) )
        {
            return 0;
        }
    }

	// For every point p in ring,
    // test if ray starting from given point crosses segment (p - 1, p)
    int iNumCrossings = 0;

    double prev_diff_x = getX(0) - dfTestX;
    double prev_diff_y = getY(0) - dfTestY;

    for ( int iPoint = 1; iPoint < iNumPoints; iPoint++ ) 
    {
        const double x1 = getX(iPoint) - dfTestX;
        const double y1 = getY(iPoint) - dfTestY;

        const double x2 = prev_diff_x;
        const double y2 = prev_diff_y;

        if( ( ( y1 > 0 ) && ( y2 <= 0 ) ) || ( ( y2 > 0 ) && ( y1 <= 0 ) ) )
        {
            // Check if ray intersects with segment of the ring
            const double dfIntersection = ( x1 * y2 - x2 * y1 ) / (y2 - y1);
            if ( 0.0 < dfIntersection )
            {
                // Count intersections
                iNumCrossings++;
            }
        }

        prev_diff_x = x1;
        prev_diff_y = y1;
    }

    // If iNumCrossings number is even, given point is outside the ring,
    // when the crossings number is odd, the point is inside the ring.
    return ( ( iNumCrossings % 2 ) == 1 ? 1 : 0 );
}

void ILI1Reader::ReadGeom( char **stgeom, int geomIdx, OGRwkbGeometryType eType,
                           OGRFeature *feature ) {
#ifdef DEBUG_VERBOSE
    CPLDebug( "OGR_ILI",
              "ILI1Reader::ReadGeom geomIdx: %d OGRGeometryType: %s",
              geomIdx, OGRGeometryTypeToName(eType) );
#endif
    if (eType == wkbNone)
    {
      CPLError( CE_Warning, CPLE_AppDefined,
                "Calling ILI1Reader::ReadGeom with wkbNone" );
    }

    // Initialize geometry.

    OGRCompoundCurve *ogrCurve = new OGRCompoundCurve();
    OGRCurvePolygon *ogrPoly = NULL; //current polygon
    OGRMultiCurve *ogrMultiLine = NULL; //current multi line

    if (eType == wkbMultiCurve || eType == wkbMultiLineString)
    {
      ogrMultiLine = new OGRMultiCurve();
    }
    else if (eType == wkbPolygon || eType == wkbCurvePolygon)
    {
      ogrPoly = new OGRCurvePolygon();
    }

    OGRPoint ogrPoint; // Current point.
    ogrPoint.setX(CPLAtof(stgeom[1])); ogrPoint.setY(CPLAtof(stgeom[2]));

    OGRLineString *ogrLine = new OGRLineString();
    ogrLine->addPoint(&ogrPoint);

    // Parse geometry.

    char **tokens = NULL;
    bool end = false;
    OGRCircularString *arc = NULL; //current arc

    while (!end && (tokens = ReadParseLine()) != NULL)
    {
      const char *firsttok = CSLGetField(tokens, 0);
      if (EQUAL(firsttok, "LIPT"))
      {
        ogrPoint.setX(CPLAtof(tokens[1])); ogrPoint.setY(CPLAtof(tokens[2]));
        if (arc) {
          arc->addPoint(&ogrPoint);
          OGRErr error =  ogrCurve->addCurveDirectly(arc);
          if (error != OGRERR_NONE) {
            CPLError(CE_Warning, CPLE_AppDefined, "Added geometry: %s", arc->exportToJson() );
          }
          arc = NULL;
        }
        ogrLine->addPoint(&ogrPoint);
      }
      else if (EQUAL(firsttok, "ARCP"))
      {
        //Finish line and start arc
        if (ogrLine->getNumPoints() > 1) {
          OGRErr error = ogrCurve->addCurveDirectly(ogrLine);
          if (error != OGRERR_NONE) {
            CPLError(CE_Warning, CPLE_AppDefined, "Added geometry: %s", ogrLine->exportToJson() );
          }
          ogrLine = new OGRLineString();
        } else {
          ogrLine->empty();
        }
        arc = new OGRCircularString();
        arc->addPoint(&ogrPoint);
        ogrPoint.setX(CPLAtof(tokens[1])); ogrPoint.setY(CPLAtof(tokens[2]));
        arc->addPoint(&ogrPoint);
      }
      else if (EQUAL(firsttok, "ELIN"))
      {
        if (ogrLine->getNumPoints() > 1) { // Ignore single LIPT after ARCP
          OGRErr error = ogrCurve->addCurveDirectly(ogrLine);
          if (error != OGRERR_NONE) {
            CPLError(CE_Warning, CPLE_AppDefined, "Added geometry: %s", ogrLine->exportToJson() );
          }
          ogrLine = NULL;
        }
        if (!ogrCurve->IsEmpty()) {
          if (ogrMultiLine)
          {
            OGRErr error = ogrMultiLine->addGeometryDirectly(ogrCurve);
            if (error != OGRERR_NONE) {
              CPLError(CE_Warning, CPLE_AppDefined, "Added geometry: %s", ogrCurve->exportToJson() );
            }
            ogrCurve = NULL;
          }
          if (ogrPoly)
          {
            OGRErr error = ogrPoly->addRingDirectly(ogrCurve);
            if (error != OGRERR_NONE) {
              CPLError(CE_Warning, CPLE_AppDefined, "Added geometry: %s", ogrCurve->exportToJson() );
            }
            ogrCurve = NULL;
          }
        }
//.........这里部分代码省略.........

int OGRGeoRSSDataSource::Open( const char * pszFilename, int bUpdateIn)

{
    if (bUpdateIn)
    {
        CPLError(CE_Failure, CPLE_NotSupported,
                    "OGR/GeoRSS driver does not support opening a file in update mode");
        return FALSE;
    }
#ifdef HAVE_EXPAT
    pszName = CPLStrdup( pszFilename );

/* -------------------------------------------------------------------- */
/*      Try to open the file.                                           */
/* -------------------------------------------------------------------- */
    VSILFILE* fp = VSIFOpenL(pszFilename, "r");
    if (fp == NULL)
        return FALSE;
    
    validity = GEORSS_VALIDITY_UNKNOWN;
    
    XML_Parser oParser = OGRCreateExpatXMLParser();
    XML_SetUserData(oParser, this);
    XML_SetElementHandler(oParser, ::startElementValidateCbk, NULL);
    XML_SetCharacterDataHandler(oParser, ::dataHandlerValidateCbk);
    oCurrentParser = oParser;
    
    char aBuf[BUFSIZ];
    int nDone;
    unsigned int nLen;
    int nCount = 0;
    
    /* Begin to parse the file and look for the <rss> or <feed> element */
    /* It *MUST* be the first element of an XML file */
    /* So once we have read the first element, we know if we can */
    /* handle the file or not with that driver */
    do
    {
        nDataHandlerCounter = 0;
        nLen = (unsigned int) VSIFReadL( aBuf, 1, sizeof(aBuf), fp );
        nDone = VSIFEofL(fp);
        if (XML_Parse(oParser, aBuf, nLen, nDone) == XML_STATUS_ERROR)
        {
            if (nLen <= BUFSIZ-1)
                aBuf[nLen] = 0;
            else
                aBuf[BUFSIZ-1] = 0;
            if (strstr(aBuf, "<?xml") && (strstr(aBuf, "<rss") || strstr(aBuf, "<feed")))
            {
                CPLError(CE_Failure, CPLE_AppDefined,
                        "XML parsing of GeoRSS file failed : %s at line %d, column %d",
                        XML_ErrorString(XML_GetErrorCode(oParser)),
                        (int)XML_GetCurrentLineNumber(oParser),
                        (int)XML_GetCurrentColumnNumber(oParser));
            }
            validity = GEORSS_VALIDITY_INVALID;
            break;
        }
        if (validity == GEORSS_VALIDITY_INVALID)
        {
            break;
        }
        else if (validity == GEORSS_VALIDITY_VALID)
        {
            break;
        }
        else
        {
            /* After reading 50 * BUFSIZ bytes, and not finding whether the file */
            /* is GeoRSS or not, we give up and fail silently */
            nCount ++;
            if (nCount == 50)
                break;
        }
    } while (!nDone && nLen > 0 );
    
    XML_ParserFree(oParser);
    
    VSIFCloseL(fp);
    
    if (validity == GEORSS_VALIDITY_VALID)
    {
        CPLDebug("GeoRSS", "%s seems to be a GeoRSS file.", pszFilename);

        nLayers = 1;
        papoLayers = (OGRGeoRSSLayer **) CPLRealloc(papoLayers, nLayers * sizeof(OGRGeoRSSLayer*));
        papoLayers[0] = new OGRGeoRSSLayer( pszName, "georss", this, NULL, FALSE );
    }

    return (validity == GEORSS_VALIDITY_VALID);
#else
    char aBuf[256];
    VSILFILE* fp = VSIFOpenL(pszFilename, "r");
    if (fp)
    {
        unsigned int nLen = (unsigned int)VSIFReadL( aBuf, 1, 255, fp );
        aBuf[nLen] = 0;
        if (strstr(aBuf, "<?xml") && (strstr(aBuf, "<rss") || strstr(aBuf, "<feed")))
        {
            CPLError(CE_Failure, CPLE_NotSupported,
//.........这里部分代码省略.........