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Heckator, posted Thu Sep 03, 2020 2:11 pm (58520)

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For a quite a long time there was a web support for Artemis visual novel engine.
There is main data (GUI, sounds, images) - Artemis.data, and wasm (WebAssembly) binaries, last one probably handling unpacking and loading, I assume.
Looks like main file is just compressed archive without encryption, but I can be wrong, since I wasn't able to identify compression type.

WebAssembly-decompile: https://github.com/WebAssembly/wabt
Artemis.wasm - https://mega.nz/file/SrAHBYSZ#kIDU7cPf_ ... X8l0uzCgTc (3 MB)
artemis.data - https://acs.imel.co.jp/wasm/imelmado/ra ... temis.data (223 MB)

Sample game (index file) - https://acs.imel.co.jp/wasm/imelmado/ra ... temis.html

reverse support (repackaging ability) will be really, really, REALLY highly appreciable.

Heckator, posted Thu Sep 03, 2020 7:53 pm (58529)

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btw bin walker says there is HPACK archive data at at 0x7E1C281
and MySQL ISAM index file Version 3 at 0xD1AE634
idk if it's false-positive.

spiritovod, posted Thu Sep 03, 2020 8:56 pm (58530)

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Data is actually encrypted, but this script should work fine: https://www.zenhax.com/viewtopic.php?f=9&t=9234#p43315