public int byteSize = 50000;
public byte[] byteArray = new byte[byteSize];
public ByteBuffer byteBuffer = ByteBuffer.allocate(byteSize);

private void writeToRawInFile(byte[] bData) {
    try {
        int index = 4;
        byteBuffer = null;
        byteBuffer = ByteBuffer.allocate(bData.length);

        byteBuffer.put(bData);
        byteBuffer.flip();


        if(byteBuffer.get(index) == 0){
            factoryType.fileServer.fc.write(byteBuffer);
        }else{
            decompressByteArray(byteBuffer.)
        }
    } catch (Exception e) {
        out.println("expMsg .writeToRawInFile()=" + e.getMessage());
        e.printStackTrace();
    }
    if (byteBuffer != null) {
        byteBuffer.clear();
    }
}

    } catch (Exception e) {
        out.println("expMsg .writeToRawInFile()=" + e.getMessage());
        e.printStackTrace();
    }
    if (byteBuffer != null) {
        byteBuffer.clear();
    }
}

public byte[] decompressByteArray(byte[] bytes){

    ByteArrayOutputStream baos = null;
    Inflater iflr = new Inflater();
    iflr.setInput(bytes);
    baos = new ByteArrayOutputStream();
    byte[] tmp = new byte[4*1024];
    try{
        while(!iflr.finished()){
            int size = iflr.inflate(tmp);
            baos.write(tmp, 0, size);
        }
    } catch (Exception ex){

    } finally {
        try{
            if(baos != null) baos.close();
        } catch(Exception ex){}
    }

    return baos.toByteArray();
}

decompressByteArray(byteBuffer.)