code: public long skip(long n) throws IOException {
  	long ret = pos + n;
  	if (ret < 0) {
  	    ret = 0;
  	    pos = 0;
  	} else if (ret > blob.size) {
  	    ret = blob.size;
  	    pos = blob.size;
  	} else {
  	    pos = (int) ret;
  	}
  	return ret;
      }
docs: Skip over blob data.