question: private void expand ( int i ) { if ( count + i <= buf . length ) { return ; } byte [ ] newbuf = mPool . getBuf ( ( count + i ) * 2 ) ; System . arraycopy ( buf , 0 , newbuf , 0 , count ) ; mPool . returnBuf ( buf ) ; buf = newbuf ; }
target:  Ensures there is enough space in the buffer for the given number of additional bytes.