There have been this stupid oversight all along since the introduction
of the class: while it reported Length and EOS correctly, it still
allowed to read past the end.
This can cause issues if the user code relies, for example, on Read()
or ReadByte() return value.
For upstream code, in practice this fixes MP3 streaming, where the length
of data is not always possible to precalculate. In ScummVM we used a
different code for MP3, but this may fix other cases as well.
From upstream 6f02bedc65b902ce41858b7e92970662020a11cf
Part of upstream 82a928cb07970acc5918905c5836c39ce11b7f32
(Tests: added BufferedStream tests)
This commit has no functional change but allows to keep the code
in ScummVM close to upstream code.
Thierry Crozat
D G Turner
Paul Gilbert
Eugene Sandulenko