Mikmod EOF problems.
tom at rothamel.us
Wed Dec 21 12:35:52 EST 2005
I've discovered a problem with the code that SDL_sound uses to integrate
with mikmod. Playing certain .xm files causes playsound to segfault. I
tracked the root cause of the problem down to SDL_sound's definition of
an eof condition (in mikmod.c) being different than what the C library
and mikmod expect.
In those libraries, eof is signaled only when attempting to read after
the end of the file. In SDL_sound, however, eof is signaled by the
location of the file being at the end of the file, even if it never
attempted to read past the end of the file.
The XM file in question stores a sample at the end of the file, and then
seems to seek back to find something else, reading the last byte of the
file but never reading past.
The attached patch changes the eof behavior of mikmod.c to match that
which mikmod expects.
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