List Valheim Portal Names of given db file

list_valheim_portal_names.py

#!python

import mmap
import argparse

def portals(dbfile):
    with open(dbfile, 'rb') as db:
        mm = mmap.mmap(db.fileno(), 0, access= mmap.ACCESS_READ)
        i, l = 0, set()
        while True:
            i = mm.find(b'\xea\x91|)', i)
            if i == -1: break
            l.add(mm[i+5:i+5+mm[i+4]].decode())
            i += 5 + mm[i+4]
        return l


def main():
    parser = argparse.ArgumentParser()
    parser.add_argument('file', type=str)
    options = parser.parse_args()
    print("File:", options.file)
    print("Portals:")
    for portal in sorted(portals(options.file)):
        print(portal)

if __name__ == '__main__':
    main()