cdm/src/main/java/ucar/nc2/iosp/netcdf3/N3raf.java
protected Object readData( Layout index, DataType dataType) throws java.io.IOException {
   return IospHelper.readDataFill(raf, index, dataType, null, -1);
 }
protected Object readData( Layout index, DataType dataType) throws java.io.IOException {
   return IospHelper.readDataFill(raf, index, dataType, null, -1);
 }
Read data subset from file for a variable, create primitive array.
@param index handles skipping around in the file.
@param dataType dataType of the variable
@return primitive array with data read in