Path: csiph.com!x330-a1.tempe.blueboxinc.net!newsfeed.hal-mli.net!feeder1.hal-mli.net!border3.nntp.dca.giganews.com!Xl.tags.giganews.com!border1.nntp.dca.giganews.com!nntp.giganews.com!local2.nntp.dca.giganews.com!nntp.westnet.com.au!news.westnet.com.au.POSTED!not-for-mail
NNTP-Posting-Date: Mon, 03 Oct 2011 10:27:28 -0500
From: "Qu0ll" <Qu0llSixFour@gmail.com>
Newsgroups: comp.lang.java.programmer
References: <y4Cdne-uvN4kUBTTnZ2dnUVZ_hWdnZ2d@westnet.com.au>
In-Reply-To: <y4Cdne-uvN4kUBTTnZ2dnUVZ_hWdnZ2d@westnet.com.au>
Subject: Re: Buffered reading seems to corrupt data stream
Date: Tue, 4 Oct 2011 02:26:45 +1100
MIME-Version: 1.0
Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=response
Content-Transfer-Encoding: 7bit
X-Priority: 3
X-MSMail-Priority: Normal
Importance: Normal
X-Newsreader: Microsoft Windows Live Mail 15.4.3538.513
X-MimeOLE: Produced By Microsoft MimeOLE V15.4.3538.513
Message-ID: <IfmdnSISO4_8SRTTnZ2dnUVZ_qmdnZ2d@westnet.com.au>
Lines: 45
X-Usenet-Provider: http://www.giganews.com
NNTP-Posting-Host: 124.168.28.143
X-Trace: sv3-9O7iznm3cKEdF+m7iCJGwr2vpSSr1R913G/PQn4dC57Quw/Fe0gk61y5NYx/1u21zkTh5mYGkyRLxD1!vFE27VynWNIwfOz2+pgqDjvFBZFDOOpU2zX16SASgieiMH98+fYIxAD241FFIrkhx4LPuH/oUjG+!nM/wJNhMx9CEs/AODNxLMw==
X-Complaints-To: abuse@westnet.com.au
X-Abuse-and-DMCA-Info: Please be sure to forward a copy of ALL headers
X-Abuse-and-DMCA-Info: Otherwise we will be unable to process your complaint properly
X-Postfilter: 1.3.40
X-Original-Bytes: 3014
Xref: x330-a1.tempe.blueboxinc.net comp.lang.java.programmer:8490

"Qu0ll"  wrote in message 
news:y4Cdne-uvN4kUBTTnZ2dnUVZ_hWdnZ2d@westnet.com.au...

> I am trying to repeatedly send a byte array from a server to a client 
> where both the writing and the reading is done in a buffered manner with 
> the following code on the server:
>
> DataOutputStream dos = new DataOutputStream(os);
> dos.writeInt(bytes.length);
> dos.write(bytes);
> dos.flush();
>
> and this on the client:
>
> System.out.println("Reading size...");
> final DataInputStream dis = new DataInputStream(new 
> BufferedInputStream(is));
> final int size = dis.readInt();
> final byte[] bytes = new byte[size];
> System.out.println("Reading " + size + " bytes...");
> dis.readFully(bytes);
>
> The problem is that for the second or third read, the size variable is 
> coming back as garbage (extremely high or even negative value) and the 
> reading of the byte array blocks as it waits for a large amount of data to 
> be received or crashes with the invalid negative size even though the 
> previous size value and the previous bytes themselves are correct. 
> However, if I remove the BufferedInputStream wrapping of stream, it works 
> perfectly.
>
> Why would that be?

I forgot to mention that there is only *one* input stream (is) and output 
stream (os) being used in to the above code. Once the connection between 
client and server is established I repeatedly send the fixed byte array data 
(fixed for testing purposes) on the connected stream.

--
And loving it,

-Qu0ll (Rare, not extinct)
_________________________________________________
Qu0llSixFour@gmail.com
[Replace the "SixFour" with numbers to email me]