if( poFeature == NULL )        ResetReading();    return poFeature;}/************************************************************************//*                           TestCapability()                           *//************************************************************************/int OGRAVCBinLayer::TestCapability( const char * pszCap ){    if( eSectionType == AVCFileARC && EQUAL(pszCap,OLCRandomRead) )        return TRUE;    else         return OGRAVCLayer::TestCapability( pszCap );}/************************************************************************//*                        FormPolygonGeometry()                         *//*                                                                      *//*      Collect all the arcs forming edges to this polygon and form     *//*      them into the appropriate OGR geometry on the target feature.   *//************************************************************************/int OGRAVCBinLayer::FormPolygonGeometry( OGRFeature *poFeature,                                          AVCPal *psPAL ){/* -------------------------------------------------------------------- *//*      Try to find the corresponding ARC layer if not already          *//*      recorded.                                                       *//* -------------------------------------------------------------------- */    if( poArcLayer == NULL )    {        int	i;        for( i = 0; i < poDS->GetLayerCount(); i++ )        {            OGRAVCBinLayer *poLayer = (OGRAVCBinLayer *) poDS->GetLayer(i);            if( poLayer->eSectionType == AVCFileARC )                poArcLayer = poLayer;        }        if( poArcLayer == NULL )            return FALSE;    }/* -------------------------------------------------------------------- *//*	Read all the arcs related to this polygon, making a working	*//*	copy of them since the one returned by AVC is temporary.	*//* -------------------------------------------------------------------- */    OGRGeometryCollection oArcs;    int		iArc;    for( iArc = 0; iArc < psPAL->numArcs; iArc++ )    {        OGRFeature *poArc;        if( psPAL->pasArcs[iArc].nArcId == 0 )            continue;        // If the other side of the line is the same polygon then this        // arc is a "bridge" arc and can be discarded.  If we don't discard        // it, then we should double it as bridge arcs seem to only appear        // once.  But by discarding it we ensure a multi-ring polygon will be        // properly formed.         if( psPAL->pasArcs[iArc].nAdjPoly == psPAL->nPolyId )            continue;        poArc = poArcLayer->GetFeature( ABS(psPAL->pasArcs[iArc].nArcId) );        if( poArc == NULL )            return FALSE;        if( poArc->GetGeometryRef() == NULL )            return FALSE;        oArcs.addGeometry( poArc->GetGeometryRef() );        OGRFeature::DestroyFeature( poArc );    }    OGRErr  eErr;    OGRPolygon *poPolygon;    poPolygon = (OGRPolygon *)         OGRBuildPolygonFromEdges( (OGRGeometryH) &oArcs, TRUE, FALSE,                                    0.0, &eErr );    if( poPolygon != NULL )        poFeature->SetGeometryDirectly( poPolygon );    return eErr == OGRERR_NONE;}/************************************************************************//*                          CheckSetupTable()                           *//*                                                                      *//*      Check if the named table exists, and if so, setup access to     *//*      it (open it), and add it's fields to the feature class          *//*      definition.                                                     *//************************************************************************/int OGRAVCBinLayer::CheckSetupTable(){    if( szTableName[0] == '\0' )        return FALSE;/* -------------------------------------------------------------------- *//*      Scan for the indicated section.                                 *//* -------------------------------------------------------------------- */    AVCE00ReadPtr psInfo = ((OGRAVCBinDataSource *) poDS)->GetInfo();    int           iSection;    AVCE00Section *psSection = NULL;    char	  szPaddedName[65];        sprintf( szPaddedName, "%s%32s", szTableName, " " );    szPaddedName[32] = '\0';    for( iSection = 0; iSection < psInfo->numSections; iSection++ )    {        if( EQUAL(szPaddedName,psInfo->pasSections[iSection].pszName)             && psInfo->pasSections[iSection].eType == AVCFileTABLE )            psSection = psInfo->pasSections + iSection;    }    if( psSection == NULL )    {        szTableName[0] = '\0';        return FALSE;    }/* -------------------------------------------------------------------- *//*      Try opening the table.                                          *//* -------------------------------------------------------------------- */    hTable = AVCBinReadOpen( psInfo->pszInfoPath,  szTableName,                             psInfo->eCoverType, AVCFileTABLE,                             psInfo->psDBCSInfo);        if( hTable == NULL )    {        szTableName[0] = '\0';        return FALSE;    }    /* -------------------------------------------------------------------- *//*      Setup attributes.                                               *//* -------------------------------------------------------------------- */    nTableBaseField = poFeatureDefn->GetFieldCount();        AppendTableDefinition( hTable->hdr.psTableDef );/* -------------------------------------------------------------------- *//*      Close table so we don't have to many files open at once.        *//* -------------------------------------------------------------------- */    AVCBinReadClose( hTable );    hTable = NULL;    return TRUE;}/************************************************************************//*                         AppendTableFields()                          *//************************************************************************/int OGRAVCBinLayer::AppendTableFields( OGRFeature *poFeature ){    AVCE00ReadPtr psInfo = ((OGRAVCBinDataSource *) poDS)->GetInfo();    if( szTableName[0] == '\0' )        return FALSE;/* -------------------------------------------------------------------- *//*      Open the table if it is currently closed.                       *//* -------------------------------------------------------------------- */    if( hTable == NULL )    {        hTable = AVCBinReadOpen( psInfo->pszInfoPath,  szTableName,                                 psInfo->eCoverType, AVCFileTABLE,                                 psInfo->psDBCSInfo);    }    if( hTable == NULL )        return FALSE;/* -------------------------------------------------------------------- *//*      Read the info record.                                           *//*                                                                      *//*      We usually assume the FID of the feature is the key but in a    *//*      polygon coverage we need to use the PolyId attribute of LAB     *//*      features to lookup the related attributes.  In this case        *//*      nTableAttrIndex will already be setup to refer to the           *//*      PolyId field.                                                   *//* -------------------------------------------------------------------- */    int	nRecordId;    void *hRecord;    if( nTableAttrIndex == -1 )        nRecordId = poFeature->GetFID();    else        nRecordId = poFeature->GetFieldAsInteger( nTableAttrIndex );    hRecord = AVCBinReadObject( hTable, nRecordId );    if( hRecord == NULL )        return FALSE;/* -------------------------------------------------------------------- *//*      Translate it.                                                   *//* -------------------------------------------------------------------- */    return TranslateTableFields( poFeature, nTableBaseField,                                  hTable->hdr.psTableDef,                                  (AVCField *) hRecord );}