Ticket #8203: iostream_filter_issue.cpp

void CheckBinaryFFOutThroughBoostFilterStream()
{
    // filtering stream fails to write 0xFF chars to ostream. Have reproduced with ofstream too
        std::ostringstream ostm(std::ios_base::out | std::ios_base::binary);

    // Use empty filtering stream. Problem was originally found with zlib_compressor
        boost::iostreams::filtering_ostream filterStream;
        filterStream.push( ostm );

        const unsigned fileSize = 30000;
        for( unsigned nWritten = 0; nWritten < fileSize; ++nWritten)
        {
        const char eofTest = -1; // Only fails with 0xFF character any other value fine

                filterStream.write( &eofTest, sizeof eofTest);
        }
        filterStream.flush();
        // This assert fails on Xcode. The number of missing characters is equal to the number
        // of times overflow got called
        assert( ostm.str().size() == fileSize);
}