Cheat Engine

exohaxor · Posted: Fri Aug 23, 2019 5:39 am Post subject: string.dump

why string dump gets all code

atom0s · Posted: Fri Aug 23, 2019 4:25 pm Post subject:

string.dump does not only dump the single function like it implies. It's basically a snapshot of the Lua state at that time to ensure the function will work again when re-executed as a normal function. So everything in the current context of the state will be recorded to some degree (the func, upvals, params, etc.).

To give you an idea of what it does behind the scenes:

string.dump calls lua_dump.
lua_dump calls luaU_dump:
https://github.com/cheat-engine/cheat-engine/blob/master/Cheat%20Engine/lua53/lua53/src/ldump.c#L201

luaU_dump calls the functions above it to rebuild the byte code which includes a header of data containing information about the chunk.

The main thing here would be DumpFunction which handles dumping all of the needed information and extra data that may be required for things to work properly. There isn't anything "wrong" or to fix. This is just how Lua works.

Keep in mind as well, Lua in CE is 5.3 so data stored is going to be larger with the different structures of the newer version of Lua. If you are testing on something else (like you said repl) it may be a different/older version of Lua.

As an example, the same code you pasted is different in size between 5.1 and 5.3:

5.1: 115 bytes
5.3: 204 bytes

You'd have to manually edit Lua's dump functions if you want it to strip out other data (such as comments) if you absolutely need that option.

exohaxor · Posted: Sat Aug 24, 2019 1:25 pm Post subject:

so can i dump single function? is there a way?

Dark Byte · Posted: Sat Aug 24, 2019 2:45 pm Post subject:

encodeFunction strips comments so you can use that

exohaxor · Posted: Sun Aug 25, 2019 4:42 am Post subject:

k thanks exactly what i wanted