[haiku-development] A true streaming equivalent of BDataIO

  • From: Christopher Humphries <redeye4@xxxxxxxxx>
  • To: haiku-development@xxxxxxxxxxxxx
  • Date: Tue, 17 Aug 2010 01:05:45 +0200

Howdy all,

The support kit provides the BDataIO class, extended with seeking in the
BPositionIO class, which serves its purpose for simple IO.

However many plug-ins insist on seekable content by accepting only a
BPositionIO. The closest solution to the streaming data construct is the
BBufferIO, which allows the buffering of data, but AFAIK it's missing the
crucial freeing part: freeing already read data, and avoiding using too much
memory in the process.

I tried writing my own subclass, where the readat function would return an
equivalent number of blocks from the disk, but I think the producer should
really be independent from the consumer in this kind of data interface.

Now, I think that a class inheriting BPositionIO that directly implements
the standard iostream class, with the general read and write function, but
with little or no actual seeking capacity, should do the job. However I
could be wrong...


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