gistfile1.py

#!/usr/bin/env python3
import sys
import os

from toolset import read_int, read_byte


class FileListEntry():
    def __init__(self):
        pass

    def read(self, stream):
        name_length = read_int(stream)
        self.name = stream.read(name_length).decode()
        pack_name_length = read_int(stream)
        self.pack_name = stream.read(pack_name_length).decode()
        self.offset = read_int(stream)
        self.size = read_int(stream)
        self.kbn = read_byte(stream)

    def __str__(self):
        return "{} ← {} [{} @ {}, kbn: {}]".format(self.name, self.pack_name, self.size, self.offset, self.kbn)

    def extract(self):
        if not self.pack_name:
            return
        with open(os.path.join(PACK_ROOT, self.pack_name), "rb") as source:
            source.seek(self.offset)
            data = source.read(self.size)
        with open(os.path.join(OUTPUT_ROOT, self.name), "wb") as output:
            output.write(data)


PACK_ROOT = None
OUTPUT_ROOT = None


def main():
    if len(sys.argv) != 3:
        print("Usage: extract-files.py filelist output-directory")
        return

    global PACK_ROOT, OUTPUT_ROOT
    PACK_ROOT = os.path.dirname(sys.argv[1])
    OUTPUT_ROOT = sys.argv[2]

    filelist_name = sys.argv[1]
    with open(filelist_name, "rb") as filelist:
        count = int.from_bytes(filelist.read(4), byteorder="big")
        files = []
        for x in range(count):
            file_entry = FileListEntry()
            file_entry.read(filelist)
            files.append(file_entry)

    for file_entry in files:
        print(file_entry)
        file_entry.extract()

if __name__ == "__main__":
    main()