cdm/src/main/java/ucar/nc2/iosp/nids/Nidsheader.java
public byte[] getUncompData(int offset, int len){
      if( len == 0 ) len = uncompdata.length - offset;
      byte[] data = new byte[len];
      System.arraycopy(uncompdata, offset, data, 0, len);
      return data;
    }
public byte[] getUncompData(int offset, int len){
      if( len == 0 ) len = uncompdata.length - offset;
      byte[] data = new byte[len];
      System.arraycopy(uncompdata, offset, data, 0, len);
      return data;
    }
read the compressed data

@param offset   offset of the compressed data
@param len      length of data to compress
@return         uncompressed byte array