bl4

Borderlands 4 save editor library - encryption, decryption, and parsing.

This library provides functionality to:

• Decrypt and encrypt Borderlands 4 .sav files
• Parse decrypted YAML save data
• Decode item serials (weapons, equipment, etc.)
• Modify save data (level, currency, inventory, etc.)

Example

use std::fs;

# fn main() -> Result<(), Box<dyn std::error::Error>> {
let encrypted = fs::read("1.sav")?;
let steam_id = "76561197960521364";

// Decrypt and parse save file
let yaml_data = bl4::decrypt_sav(&encrypted, steam_id)?;
let mut save = bl4::SaveFile::from_yaml(&yaml_data)?;

// Query and modify save data
println!("Character: {:?}", save.get_character_name());
println!("Cash: {:?}", save.get_cash());

save.set_cash(999999)?;
save.set_character_name("NewName")?;

// Re-encrypt and save
let modified_yaml = save.to_yaml()?;
let encrypted = bl4::encrypt_sav(&modified_yaml, steam_id)?;
fs::write("1.sav", encrypted)?;
# Ok(())
# }