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[poy <1649066@xxxxxxxxxxxxxxxxxx>]

applied - utf8-validation-1649066 bookmark.

TODO - could you please:
- add a test case for this in test/testxml.cpp?
- make this somehow optional so current hub lists keep working for now?

and I'd be interested in knowing how much this impacts the time it takes
to parse some big file lists...

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https://bugs.launchpad.net/bugs/1649066

Title:
  Invalid UTF-8 data is not always being rejected

Status in AirDC++:
  New
Status in DC++:
  New

Bug description:
  There are various cases where invalid UTF-8 data is being consumed by
  the core:

  1. Text::convert will return the original string in case of errors (Linux only, respective Windows-specific functions will return an empty string in case of errors)
  2. When using "utf-8" encoding in NMDC hubs, the original string will always be returned by conversion functions without validation (generally Linux only since "utf-8" can't be selected from DC++'s GUI)
  3. UTF-8 validation is not performed for strings parsed from XML (specifically file/directory names in filelists)

  This will cause issues especially when the data is processed by
  external sources/libraries that expect to receive valid UTF-8 data
  (https://github.com/airdcpp-web/airdcpp-webclient/issues/204). I'm not
  sure about security implications.

  Another note: messages that fail UTF-8 validation in ADC hubs are
  ignored silently. At least Flexhub seems to be having problems with
  data validation which currently goes unnoticed.

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