How to read and write line by line?

[Alex Snet]

Hi!

How I can read and write information to/from socket line by line?

Now I'm doing this:

tcpSocket.waitForReadyRead();
QByteArray request( tcpSocket.readAll() );

tcpSocket.waitForReadyRead();
QByteArray request( tcpSocket.readAll() );

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But this is incorrect, because program don't wait two "\r\n" and after first write goes next.

PS I'm writing a small HTTP server.

And also one question: how I can get speed of file downloading? And how I can set it? Or how I can abor connection from UI?