a_little_to_the_left_save_editor.py

#!/usr/bin/env python3
# A Little To The Left Save Editor
# Usage: python3 a_little_to_the_left_save_editor.py decrypt save1.json save1_decrypted.json
# Usage: python3 a_little_to_the_left_save_editor.py encrypt save1_decrypted.json save1.json
# See https://www.pcgamingwiki.com/wiki/A_Little_to_the_Left for save file locations
# Backup your save file before using this script
import argparse
import json

SHIFT = 11


def obfuscate(data, shift):
    return bytes([(shift + x) % 0xFFFF for x in data])


def decrypt(args):
    # WTF were they doing
    with open(args.encrypted_file, "r", encoding="utf-8") as f:
        data = f.read().encode("latin1")
    data = obfuscate(data, -SHIFT)
    j = json.loads(data)
    with open(args.decrypted_file, "w", encoding="utf-8") as f:
        json.dump(j, f, indent=4)


def encrypt(args):
    with open(args.decrypted_file, "r", encoding="utf-8") as f:
        j = json.load(f)
    s = json.dumps(j, separators=(",", ":"))
    data = obfuscate(s.encode("latin1"), SHIFT)
    with open(args.encrypted_file, "w", encoding="utf-8") as f:
        f.write(data.decode("latin1"))


def main():
    parser = argparse.ArgumentParser(description="A Little To The Left Save Editor")
    subparsers = parser.add_subparsers(dest="command", required=True)

    parser_decrypt = subparsers.add_parser("decrypt")
    parser_decrypt.add_argument("encrypted_file", type=str)
    parser_decrypt.add_argument("decrypted_file", type=str)
    parser_decrypt.set_defaults(func=decrypt)

    parser_encrypt = subparsers.add_parser("encrypt")
    parser_encrypt.add_argument("decrypted_file", type=str)
    parser_encrypt.add_argument("encrypted_file", type=str)
    parser_encrypt.set_defaults(func=encrypt)

    args = parser.parse_args()
    args.func(args)


if __name__ == "__main__":
    main()