I'm extending Transform, and I'm a little unclear when to
call transform._transform(chunk, encoding, callback)'s callback.
The documentation says "Call the callback function only when the current
chunk is completely consumed. Note that there may or may not be output as a
result of any particular input chunk.". But what does "completely consumed"
mean?
If I can't use the chunk yet (because I need to wait for more data for a
full packet, and the packet's length has to be in the packet's header), and
I keep a reference to the chunk, does that mean that I shouldn't call the
callback yet? If that's the case, I guess that I need to keep the callback
associated with each of these chunks.
this._pendingChunks = [];
...
this._pendingChunks.push({chunk: chunk, callback: callback});
Then I can call each chunk's callback (in a latter execution of _transform)
when I've used it to create and push a complete packet, and I've no longer
a need to reference the chunk.
Or am I making things more complicated than they need to be?
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