question: private static void readOp ( byte [ ] outBuffer , int dst_buff_offset , int count , byte [ ] srcBuffer , int read_pos , int buff_len ) { if ( read_pos + count <= buff_len ) { System . arraycopy ( srcBuffer , read_pos , outBuffer , dst_buff_offset , count ) ; } else { int tillEndCount = buff_len - read_pos ; System . arraycopy ( srcBuffer , read_pos , outBuffer , dst_buff_offset , tillEndCount ) ; int fromStartCount = count - tillEndCount ; System . arraycopy ( srcBuffer , 0 , outBuffer , dst_buff_offset + tillEndCount , fromStartCount ) ; } }
target:  Utility method used for read operations