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Currently, code_last_byte is set only after it has been used, i.e. context->block_buf[0] = context->block_buf[context->code_last_byte - 2]; comes before anything has touched context->code_last_byte yet. Except for the initialisation. context->code_last_byte is set a few lines later, though. And nowhere else, except for the initialisation which sets it to 0. That will inevitably lead to context->block_buf[-2] which is undefined behaviour. We hence set the code_last_byte to 2 in order to not make that array index invalid. https://bugzilla.gnome.org/show_bug.cgi?id=778584
c1fd9f5d