Ys VIII container extract

import struct;
import os;
import sys;

file=open("rootast.xai",'rb');

next=48;

while(next<699744):
    file.seek(next);
    next+=48
    file.seek(4,1);

    nameptr=file.read(4);

    file.seek(8,1);

    size=struct.unpack("=I",file.read(4))[0];

    file.seek(12,1);

    dataptr=struct.unpack("=I",file.read(4))[0]

    pos=file.tell();

    namePos=struct.unpack("=I",nameptr)[0]

    file.seek(namePos);

    charac=(struct.unpack("=b",file.read(1))[0])

    b=bytearray();
    while(charac!=0):
        b.append(charac);
        charac = struct.unpack("=b", file.read(1))[0]

    fullName=b.decode('utf8');

    file.seek(dataptr);

    data=file.read(size);

    f=fullName.rsplit('/',1);

    folder=f[0];
    print (fullName)
    try:
        fileName=f[1]
        try:
            os.makedirs(folder,777);

        except: pass
        f2 = open(fullName, "wb");
        f2.write(data);
    except:pass