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Improve filter's notion of "done" to optimize filter processing.
Filters had different ideas about what "done" meant and this added complication to the group filter processing. For example, gzip decompression would detect end of stream and mark the filter as done before it had been flushed. Improve the IoFilter interface to give a consistent definition of done across all filters, i.e. no filter can be done until it has started flushing no matter what the underlying driver reports. This removes quite a bit of tricky logic in the processing loop which tried to determine when a filter was "really" done. Also improve management of the input buffers by pointing directly to the prior output buffer (or the caller's input) to eliminate loops that set/cleared these buffers.
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This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
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This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
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This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
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