- From: Jonas Sicking <jonas@sicking.cc>
- Date: Tue, 27 Apr 2010 14:04:35 -0700
- To: Darin Fisher <darin@chromium.org>
- Cc: Web Applications Working Group WG <public-webapps@w3.org>
On Tue, Apr 27, 2010 at 1:59 PM, Darin Fisher <darin@chromium.org> wrote: > On Tue, Apr 27, 2010 at 1:33 PM, Jonas Sicking <jonas@sicking.cc> wrote: >> >> On Tue, Apr 27, 2010 at 1:26 PM, Darin Fisher <darin@chromium.org> wrote: >> >> It would be nice to be able to allow streaming such that every time a >> >> progress event is fired only the newly downloaded data is available. >> >> The UA is then free to throw away that data once the event is done >> >> firing. This would be useful in the cases when the page is able to do >> >> incremental parsing of the resulting document. >> >> >> >> If we add a 'load mode' flag on XMLHttpRequest, which can't be >> >> modified after send() is called, then streaming to a Blob could simply >> >> be another enum value for such a flag. >> >> >> >> There is still the problem of how the actual blob works. I.e. does >> >> .responseBlob return a new blob every time more data is returned? Or >> >> should the same Blob be constantly modifying? If modifying, what >> >> happens to any in-progress reads when the file is modified? Or do you >> >> just make the Blob available once the whole resource has been >> >> downloaded? >> >> >> > >> > >> > This is why I suggested using FileWriter. FileWriter already has to >> > deal with >> > most of the problems you mentioned above, >> >> Actually, as far as I can tell FileWriter is write-only so it doesn't >> deal with any of the problems above. > > When you use createWriter, you are creating a FileWriter to an existing > File. > The user could attempt to create a FileReader to the very same File while > a FileWriter is open to it. > It is true that for <input type=saveas> there is no way to get at the > underlying > File object. That is perhaps a good thing for the use case of downloading > to > a location specified by the user. Ah. But as far as I can tell (and remember), it's still fairly undefined what happens when the OS file under a File/Blob object is mutated. / Jonas
Received on Tuesday, 27 April 2010 21:05:28 UTC