Savegame Versioning

[OmerMor]

Hi,
I was wondering: How do you manage to keep savegame compatibility between different versions of the VM ?

[eriktorbjorn]

I was wondering: I do you manage to keep savegame compatibility between different versions of the VM ?

ScummVM should almost always be able to read savegames that were made with an older version. I think there have been a few times when savegame compatibility was broken for some game engine, but those are few and far between.

[OmerMor]

I'm sorry - I made a typo: I meant to ask "How do you manage" to keep this backward compatibility. I just edited the post.
I am asking as programmer who deals with versioning problems on my job, and is interested in your versioning strategy.
I guess I could go read your code, but I figured asking here would be simpler.

[md5]

In most (all?) cases there's a byte signifying the savegame version, and there's code that handles previous saved games. An example would be the SCI savegame code inside sci/engine/savegame.cpp