#ironman #eu4

bin+lib eu4save

Ergonomically work with all EU4 saves (ironman and multiplayer)

12 releases

new 0.2.4 Sep 12, 2020
0.2.3 Sep 7, 2020
0.2.2 Aug 29, 2020
0.1.6 Aug 24, 2020

#125 in Parser tooling

Download history 25/week @ 2020-08-07 87/week @ 2020-08-14 105/week @ 2020-08-21 201/week @ 2020-08-28 434/week @ 2020-09-04 130/week @ 2020-09-11

296 downloads per month
Used in jomini

MIT license


ci Version

EU4 Save

EU4 Save is a library to ergonomically work with EU4 saves (ironman + mp).

use eu4save::{Eu4Extractor, Encoding, CountryTag};
use std::io::Cursor;

let data = std::fs::read("assets/saves/eng.txt.compressed.eu4")?;
let (save, encoding) = Eu4Extractor::extract_save(Cursor::new(&data[..]))?;
assert_eq!(encoding, Encoding::TextZip);
assert_eq!(save.meta.player, CountryTag::from("ENG"));

Eu4Extractor will deserialize both plaintext (used for mods, multiplayer, non-ironman saves) and binary (ironman) encoded saves into the same structure.


Even once decoded, the data might be too low level. For example a country can have an income ledger that looks like:

income = { 1.000 0 2.000 0.000 1.500 }

While the structure will decoded successfully into a vector, the context of what each index means is missing. What value represents the income from trade?

To help solve questions like these, the Query API was created

use eu4save::{Eu4Extractor, Encoding, CountryTag, query::Query};
use std::io::Cursor;

let data = std::fs::read("assets/saves/eng.txt.compressed.eu4")?;
let (save, _encoding) = Eu4Extractor::extract_save(Cursor::new(&data[..]))?;
let save_query = Query::from_save(save);
let trade = save_query.save().game.countries.get(&CountryTag::from("ENG"))
    .map(|country| save_query.country_income_breakdown(country))
    .map(|income| income.trade);
assert_eq!(Some(17.982), trade);


By default, ironman saves will not be decoded properly.

To enable support, one must supply an environment variable (EU4_IRONMAN_TOKENS) that points to a newline delimited text file of token descriptions. For instance:

0xffff my_test_token
0xeeee my_test_token2

PDS has declared that in order to comply with EU4's terms of use, the list of tokens must not be shared. I am also restricted from divulging how the list of tokens can be derived.

You may look to other projects EU4 ironman projects like ironmelt or paperman for inspiration.


~48K SLoC