[Development] Enhancement to QIODevice?

Andrzej Ostruszka andrzej.ostruszka at gmail.com
Tue Sep 15 11:41:10 CEST 2015

On 09/15/2015 03:53 AM, Thiago Macieira wrote:
> On Monday 14 September 2015 12:25:20 Andrzej Ostruszka wrote:
>> So what I'm aiming to is to make the "line" (or more generally "packet")
>> termination a bit more flexible, that is to allow user to specify the
>> delimiter.  Currently I think the only available solution for my wish is
>> double buffering - that is to introduce my own buffer that will suck
>> everything from QIODevice and allow searching for other delimiter but
>> I'd like to do better than that.
> You could use peek() to search the buffer, then read() exactly as much as you
> really need.
I understand that we are talking about 
QIODevicePrivateLinearBuffer::peek() here.

In your approach I'd be copying data twice, but I can eliminate one with 
directly to the output buffer and later skip()ping in successful case.  
However in case
when delimiter is not yet available I'd have unnecessary copying.
And while peek()ing I'd have to use the min(max size of my output 
buffer, size())
which would mean that I'd be copying "overlapping" parts more than once.

This is suboptimal.

Should I drop this proposal?  From other replies I gather that I'm not 
the only one
that would welcome this or similar enhancement.


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