D12047: Avoid crash when reading corrupt data from document terms db

[Stefan Brüns]

bruns created this revision.
bruns added reviewers: Baloo, michaelh.
Restricted Application added projects: Frameworks, Baloo.
Restricted Application added a subscriber: Frameworks.
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REVISION SUMMARY
  The terms db contains terms, where each terms is stored independently
  (terminated with 0), or as a suffix to the previous term (terminated with
  1).
  In case of corrupted data, the first terminator seen may be a 1, which
  leads to a crash when trying to access the previous term with
  QVector<>::last().
  Show a debug message, to give a hint about the bad data, which can be
  fixed by reindexing the relevant file.
  
  BUG: 392878
  CCBUG: 392877

TEST PLAN
  Corrupt the database
  Run balooshow -x <affected file(s)>

REPOSITORY
  R293 Baloo

BRANCH
  b392878_avoid_docterms_decode_crash

REVISION DETAIL
  https://phabricator.kde.org/D12047

AFFECTED FILES
  src/codecs/doctermscodec.cpp
  src/engine/documentdb.cpp

To: bruns, #baloo, michaelh
Cc: #frameworks, ashaposhnikov, michaelh, astippich, spoorun, ngraham, bruns, alexeymin
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