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Love2d executable unpacker.
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| import argparse | |
| import os, os.path | |
| import zipfile | |
| import io | |
| def readui32(file): | |
| bytes = file.read(4) | |
| number = bytes[0] | |
| number += bytes[1] << 8 | |
| number += bytes[2] << 16 | |
| number += bytes[3] << 24 | |
| return number | |
| def skip2zip(file): | |
| SIGNATURE = b'PK\x05\x06' | |
| # retrieve the file size | |
| file.seek(0, 2) | |
| filesize = file.tell() | |
| # scan the last 65k (2^16) for the zip signature | |
| signature_position = filesize | |
| while signature_position > filesize - (2 << 16): | |
| file.seek(signature_position, 0) | |
| data = file.read(len(SIGNATURE)) | |
| if data == SIGNATURE: | |
| break | |
| signature_position -= 1 | |
| else: | |
| raise ValueError("Corrupted zip archive.") | |
| # skip 8 bytes | |
| file.seek(8, 1) | |
| # read size and offset of central directory | |
| size = readui32(file) | |
| offset = readui32(file) | |
| # Calculate beginning of the zip file: | |
| # There is a "central directory" with the size 'size' located at 'offset' (relative to the zip | |
| # file). The signature is appended directly after the central directory. We have already found | |
| # the signature start and know the size of the central directory, so we can calculate the | |
| # beginning of the central directory via 'signature_position - size'. The result is the "real" | |
| # offset inside the packed executable. The supposed offset inside the zip file is stored at | |
| # 'offset', so we can calculate the beginning of the zip-file. | |
| start = (signature_position - size) - offset | |
| # seek to the beginning position | |
| file.seek(start, 0) | |
| def unpack(executablename, unzipdestination=None, lovefilename=True): | |
| with open(executablename, 'rb') as executable: | |
| skip2zip(executable) | |
| data = executable.read() | |
| if lovefilename: | |
| with open(lovefilename, 'wb') as lovefile: | |
| lovefile.write(data) | |
| if unzipdestination: | |
| if not os.path.isdir(unzipdestination): | |
| os.makedirs(unzipdestination) | |
| zipdata = io.BytesIO(data) | |
| with zipfile.ZipFile(zipdata, 'r') as zip: | |
| zip.extractall(unzipdestination) | |
| if __name__=="__main__": | |
| parser = argparse.ArgumentParser(description='Unpack a love executable.') | |
| parser.add_argument('-x', '--extract', metavar="DESTINATION", type=str, help="Unzip files to this folder") | |
| parser.add_argument('-l', '--love', metavar="DESTINATION", type=str, help="Filename of the .love file to write.") | |
| parser.add_argument('executable', type=str, help='Executable to unpack') | |
| args = parser.parse_args() | |
| unpack(args.executable, unzipdestination=args.extract, lovefilename=args.love) | |
cool. i can see inside the code of snacktorio on itch.io thanks to this
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Nice, thanks! Could I use this in a project?