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  • presumably with gzip you can't start transmitting the header until you've obtained, stored and compressed all the data? (because you need the checksum to create the header) Commented Jun 30, 2009 at 11:25
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    In the gzip format, the checksum comes at the end of the file, specifically so one can start writing deflate blocks as they are processed without having to hold everything up. Commented Oct 20, 2009 at 16:00