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`MkvTree` can be used all across the module, meaning that it better belongs in `Util.hpp` than with static linkage in `matroska_segment_parse.cpp`. - A helper function `MkvTree_va` has been introduced so that one can easily call the function from functions that accepts a variadic number of arguments (using va_list). - The implementation has been optimized so that we do not need to allocate storage for the format string on every invocation if it would fit inside a fixed length buffer. - An error check has been added to signal if we run out of memory. Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>
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