DatagramChannel.read omitting zeros at end of packets?

[Sebastian Staudt]

Hello.

I'm trying to read packets from a DatagramChannel and only get non-
zero data of a packet. Zeros at the end of the packet are discarded.
Doing the same with the channel's DatagramSocket.receive(), I get the
whole packet data.
For example there's a 20 byte long packet arriving which consists of
10 bytes random data and 10 zeros. With the channel I only get the
first 10 bytes. The socket gives me the whole 20 bytes.

Did I miss something or is this a bug in DatagramChannel.read() or
even wanted behavior?

PS: I'm using this with Java 1.5.

 

[Sebastian Staudt]

Oops... I forgot to mention that my "zeros" are a String of multiple
zeros (0x30) terminated by 0x00.

 

[Sebastian Staudt]

Ok... I got it.

After sending over the channel, I did not reset the buffer to a
sufficient size.
So it was merely a coincidence that the additional zeros where cut
off.

Shame on me.