[opendemo-devel] qvm playback with compressed files

[Dr. U. G. <Uwe...@ph...>]

Hello!

I just analysed the crashing behaviour of the QVM code on playback of
compressed files. It is really strange. The attached patch file adds a mini
trace to the first call of fbReadChar, which get the character '<', as we all
would expect. But the calling function xmlParseText get another return value.

Loading vm file vm/qagame.qvm.
VM file qagame compiled to 1493476 bytes of code
qagame loaded in 19045056 bytes on the hunk
fbReadChar(0) = '<' = 60
xmlParseText: character = 'h' = 104
End of recording
Received signal 11, exiting...
Shutdown tty console

Sooner or or later this results in XML problems and the playback stops
(output: "End of recording"). Then somehow (not really important just now)
the program crashs totally with a SIGSEGV (segmantation violation).

So the main problem is why the print of the character before the return
statement of fbReadChar() was '<' but the calling function get another value
back. I have no idea, how this could occur, especially I don't see the
connection with the zlib code.

Bye, Uwe