I am using ByteToMessageDecoder

decode(ChannelHandlerContext ctx, ByteBuf bytebuf, List<Object> out) {
...
}

I want to perform some validation on incoming bytebuffer and then send bytebuf.nioBuffer() to out

1. do i have to make a copy of the bytebuf.nioBuffer() and add to output. if so what is the best way to do it
2. if I just add bytebuf.nioBuffer() to output will there be a chance of corruption
3. best way to extract ByteBuffer from netty ByteBuf, are there any utils available