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import hashlib
import os.path as path
import shutil
CHECKSUM_SIZE = 0x10 # bytes
RECORD_SIZE = 0x280000 # bytes
CHECKSUM_BASE = 0x00000300 # slot 0
RECORD_BASE = 0x00000310 # slot 0
def get_range(slot_index: int):
"""Calculate checksum and record ranges for certain slot.
Args:
slot_index (int): Index of slot. 0-based.
Returns:
tuple: (checksum_left, checksum_right, block_left, block_right). Left closed, right closed.
"""
checksum_left = CHECKSUM_BASE + (CHECKSUM_SIZE + RECORD_SIZE) * slot_index
checksum_right = checksum_left + CHECKSUM_SIZE - 1
block_left = checksum_right + 1
block_right = block_left + RECORD_SIZE - 1
# [ for debug ]
# print(
# list(map(hex,
# (checksum_left, checksum_right, block_left, block_right))))
return (checksum_left, checksum_right, block_left, block_right)
def backup(sl2_path: str):
"""Backup sl2 file to the directory of sl2_path.
Args:
sl2_path (str): Path of ER sl2 save file.
"""
backup_filename = path.basename(sl2_path) + '.fixbackup'
backup_savepath = path.join(path.dirname(sl2_path), './', backup_filename)
shutil.copyfile(sl2_path, backup_savepath)
def fix(sl2_path: str, slot_index: int):
"""Fix the corrupt save by re-calculating the checksum.
Args:
sl2_path (str): Path of ER sl2 save file.
slot_index (int): Index of slot. 0-based.
"""
(checksum_left, checksum_right, block_left,
block_right) = get_range(slot_index)
new_content = b''
with open(sl2_path, 'rb+') as fp:
# read range [start] -> [checksum]
new_content = fp.read(checksum_left)
# calculate new checksum
fp.seek(block_left, 0)
game_record = fp.read(block_right - block_left + 1)
assert len(game_record) == RECORD_SIZE, 'Bad game save file. No enough game record.'
new_checksum = hashlib.md5(game_record).digest()
# concat new checksum
new_content += new_checksum
# concat the rest
fp.seek(block_left, 0)
new_content += fp.read()
# overwrite the save
fp.seek(0)
fp.write(new_content)
def main(sl2_path: str, slot_index: int):
# check input format
assert len(sl2_path) > 0, 'Save file path not specified.'
assert path.basename(sl2_path) == 'ER0000.sl2', 'Selected file is not ER0000.sl2.'
assert slot_index >= 0, 'Invalid slot index.'
assert slot_index <= 9, 'Invalid slot index.'
# backup the save
backup(sl2_path)
print('The corrupt save has been backup with external name .fixbackup.')
# fix the save
print('Start fixing {} @ slot {}.'.format(sl2_path, slot_index))
fix(sl2_path, slot_index)
print('Fixing done successfully!')
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发表于 2022-2-27 05:14
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