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[eMTee <1656050@xxxxxxxxxxxxxxxxxx>]

I can confirm similar problems sporadically appearing during transfers between DC++ 0.864 and clients equipped with both zlib 1.2.10 and older versions.
Tested with downloading filelists, always the same transfers with same clients fail while the rest succeed so it probably depends on the data being compressed.


** Changed in: dcplusplus
       Status: New => Confirmed

** Changed in: dcplusplus
   Importance: Undecided => High

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https://bugs.launchpad.net/bugs/1656050

Title:
  Compression errors with zlib 1.2.10

Status in AirDC++:
  New
Status in ApexDC++:
  New
Status in DC++:
  Confirmed

Bug description:
  After updating zlib to version 1.2.10, transfers randomly fail because
  of compression errors. Such errors happening on uploader's side won't
  reported anywhere, the upload just gets disconnected.

  Based on some debugging with AirDC++, the actual location where the
  error happens in zlib is
  https://github.com/madler/zlib/blob/master/deflate.c#L595

  I'm not sure whether that's a bug in zlib or something intended as
  there are also breaking changes in version 1.2.10:
  https://github.com/madler/zlib/issues/190 (avail_out is not originally
  zero when the call is made)

  Setting compression level at
  https://sourceforge.net/p/dcplusplus/code/ci/default/tree/dcpp/ZUtils.cpp#l59
  to a non-zero value seems to help with avoiding the issue.

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