question: private final int filterStatusBytes ( byte [ ] src , byte [ ] dest , int totalBytesRead , int maxPacketSize ) { final int packetsCount = totalBytesRead / maxPacketSize + ( totalBytesRead % maxPacketSize == 0 ? 0 : 1 ) ; for ( int packetIdx = 0 ; packetIdx < packetsCount ; ++ packetIdx ) { final int count = ( packetIdx == ( packetsCount - 1 ) ) ? ( totalBytesRead % maxPacketSize ) - MODEM_STATUS_HEADER_LENGTH : maxPacketSize - MODEM_STATUS_HEADER_LENGTH ; if ( count > 0 ) { System . arraycopy ( src , packetIdx * maxPacketSize + MODEM_STATUS_HEADER_LENGTH , dest , packetIdx * ( maxPacketSize - MODEM_STATUS_HEADER_LENGTH ) , count ) ; } } return totalBytesRead - ( packetsCount * 2 ) ; }
target:  Filter FTDI status bytes from buffer