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Must you read all you can on kCFStreamEventHasBytesAvailable?

If you're using a CFReadStream in the non-blocking mode, and your callback receives kCFStreamEventHasBytesAvailable, what happens if you don't consume all the bytes that are available? In the best of all possible worlds, you'd get another kCFStreamEventHasBytesAvailable message. The sample code in the CFNetwork Programming Guide seems to suggest that is so, because it just reads what fits in one buffer on kCFStreamEventHasBytesAvailable. In contrast, CFFTPSample takes pains to keep reading until either CFReadStreamHasBytesAvailable returns false or CFReadStreamRead reads 0 bytes.
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James W. Walker, ScriptPerfection Enterprises, Inc.
<http://www.write-brain.com/>
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