fix some SDMF partial-read cases #177
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…left). refs #2462 Signed-off-by: Daira Hopwood <daira@jacaranda.org>
Signed-off-by: Daira Hopwood <daira@jacaranda.org>
This should tolerate offset/size combinations that read the last byte of the file, something which was broken before. It quits early in the case of zero-byte reads, to simplify the resulting "which segments do I need" logic. Probably addresses ticket:2459.
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This cleans up the mutable-retrieve code a bit, and should fix some corner cases where an offset/size combinations that reads the last byte of the file (but not the first) could cause an assert to fire, making the download hang. Should address ticket:2459 and ticket:2462.