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);
}