#!/usr/bin/env -S python3

import subprocess
import sys


def main():
    [_, input] = sys.argv
    input_tar = input.replace(".cprmt", ".tar")
    output = input_tar.replace(".tar", "")
    print("Decompressing '" + input + "' into '" + output + "'.")
    input_fd = open(input, "rb")
    output_tar_fd = open(input_tar, "wb")
    byte_index = 0
    while True:
        read = input_fd.read(1024)
        if len(read) == 0:
            break
        for byte in read:
            if byte_index == 0:
                pass
            else:
                output_tar_fd.write(bytes([byte]))
            byte_index += 1
            byte_index %= 5
    subprocess.Popen(["tar", "xf", input_tar]).wait()
    print("Done.")


if __name__ == "__main__": main()