br_taikenban_editor.py

"""Burning Rangers Taikenben editor.
Modifies the .bin file with the main game on it to play additional missions.
Expects an input file (before modification) with the SHA-1 hash
acdb237c6c6fa34f6f6bdab767e88f15a6670d6b.
"""
from argparse import ArgumentParser

parser = ArgumentParser('Modify Burning Rangers Taikenben')
parser.add_argument('file_path', type=str, help='Path to first .bin file')
parser.add_argument('round_number', type=int, help='Which round to load')
args = parser.parse_args()

round_number = args.round_number.to_bytes(1, 'big')

with open(args.file_path, 'rb+') as f:
    # The bytes at this position should be 0xE000
    f.seek(0x61536)
    if f.read(1) != b'\xe0':
        raise RuntimeError('Could not locate position to write')
    f.write(round_number)

print(f'Updated round number to {args.round_number}')