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i2ptunnel: Fix gzip footer check in GunzipOutputStream (Gitlab #458)

zzz requested to merge zzz/i2p.i2p:458-gunzip into master
  • verifyFooter() was never called due to incorrect footer length check
  • footerSize calculation was incorrect (off by one)
  • footer buffer rotation was incorrect
  • CRC32 was not computed

All bugs present since original checkin, 2015-05

Additional cleanups:

  • remove write(byte[]) method present in super
  • toString() improvements to aid debugging = do not reset inflater when finished so toString() data remain valid

Closes #458 (closed)

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