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Clear stream errors in FileStore::MaxRetrievable (GH #968)

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Jeffrey Walton 2020-09-20 06:08:15 -04:00
parent 0763b9984c
commit c280ccd33b
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1 changed files with 9 additions and 0 deletions
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9
files.cpp
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@ -65,10 +65,19 @@ lword FileStore::MaxRetrievable() const
if (!m_stream)
return 0;
// Clear error bits due to seekg(). Also see
// https://github.com/weidai11/cryptopp/pull/968
std::streampos current = m_stream->tellg();
std::streampos end = m_stream->seekg(0, std::ios::end).tellg();
m_stream->clear();
m_stream->seekg(current);
m_stream->clear();
// Return max for a non-seekable stream
// https://www.cplusplus.com/reference/istream/istream/tellg/
if (end == static_cast<std::streampos>(-1))
return LWORD_MAX;
return end-current;
}