Fix failed upload #121

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2 errors and 6 warnings

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comparison of integers of different signs: 'long long' and 'const size_t' (aka 'const unsigned long') [-Wsign-compare]

comparison of integers of different signs: 'long long' and 'const size_t' (aka 'const unsigned long') [-Wsign-compare]

adding 'char' to a string does not append to the string [-Wstring-plus-int]

unused parameter 'stream' [-Wunused-parameter]

unused variable 'num_read' [-Wunused-variable]