int TigerPolygon::SetModule( const char * pszModule )
{
if( !OpenFile( pszModule, "A" ) )
return FALSE;
EstablishFeatureCount();
/* -------------------------------------------------------------------- */
/* Open the RTS file */
/* -------------------------------------------------------------------- */
if( bUsingRTS )
{
if( fpRTS != NULL )
{
VSIFCloseL( fpRTS );
fpRTS = NULL;
}
if( pszModule )
{
char *pszFilename;
pszFilename = poDS->BuildFilename( pszModule, "S" );
fpRTS = VSIFOpenL( pszFilename, "rb" );
CPLFree( pszFilename );
nRTSRecLen = EstablishRecordLength( fpRTS );
}
}
return TRUE;
}
void TigerFileBase::EstablishFeatureCount()
{
if( fpPrimary == NULL )
return;
nRecordLength = EstablishRecordLength( fpPrimary );
if( nRecordLength == -1 )
{
nRecordLength = 1;
nFeatures = 0;
return;
}
/* -------------------------------------------------------------------- */
/* Now we think we know the fixed record length for the file */
/* (including line terminators). Get the total file size, and */
/* divide by this length to get the presumed number of records. */
/* -------------------------------------------------------------------- */
long nFileSize;
VSIFSeek( fpPrimary, 0, SEEK_END );
nFileSize = VSIFTell( fpPrimary );
if( (nFileSize % nRecordLength) != 0 )
{
CPLError( CE_Warning, CPLE_FileIO,
"TigerFileBase::EstablishFeatureCount(): "
"File length %d doesn't divide by record length %d.\n",
(int) nFileSize, (int) nRecordLength );
}
nFeatures = nFileSize / nRecordLength;
}
